^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2008 Advanced Micro Devices, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Author: Joerg Roedel <joerg.roedel@amd.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #define pr_fmt(fmt) "DMA-API: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/scatterlist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/dma-map-ops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/sched/task.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/stacktrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include "debug.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define HASH_SIZE 16384ULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define HASH_FN_SHIFT 13
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define HASH_FN_MASK (HASH_SIZE - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /* If the pool runs out, add this many new entries at once */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define DMA_DEBUG_DYNAMIC_ENTRIES (PAGE_SIZE / sizeof(struct dma_debug_entry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) dma_debug_single,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) dma_debug_sg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) dma_debug_coherent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) dma_debug_resource,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) enum map_err_types {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) MAP_ERR_CHECK_NOT_APPLICABLE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) MAP_ERR_NOT_CHECKED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) MAP_ERR_CHECKED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #define DMA_DEBUG_STACKTRACE_ENTRIES 5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * struct dma_debug_entry - track a dma_map* or dma_alloc_coherent mapping
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * @list: node on pre-allocated free_entries list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * @dev: 'dev' argument to dma_map_{page|single|sg} or dma_alloc_coherent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * @size: length of the mapping
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * @type: single, page, sg, coherent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * @direction: enum dma_data_direction
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * @sg_call_ents: 'nents' from dma_map_sg
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * @sg_mapped_ents: 'mapped_ents' from dma_map_sg
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * @pfn: page frame of the start address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * @offset: offset of mapping relative to pfn
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * @map_err_type: track whether dma_mapping_error() was checked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * @stacktrace: support backtraces when a violation is detected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct dma_debug_entry {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) u64 dev_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) u64 size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) int type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) int direction;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) int sg_call_ents;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) int sg_mapped_ents;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) unsigned long pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) size_t offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) enum map_err_types map_err_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) #ifdef CONFIG_STACKTRACE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) unsigned int stack_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) unsigned long stack_entries[DMA_DEBUG_STACKTRACE_ENTRIES];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) } ____cacheline_aligned_in_smp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) typedef bool (*match_fn)(struct dma_debug_entry *, struct dma_debug_entry *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) struct hash_bucket {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) /* Hash list to save the allocated dma addresses */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) static struct hash_bucket dma_entry_hash[HASH_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /* List of pre-allocated dma_debug_entry's */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) static LIST_HEAD(free_entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) /* Lock for the list above */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) static DEFINE_SPINLOCK(free_entries_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) /* Global disable flag - will be set in case of an error */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) static bool global_disable __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /* Early initialization disable flag, set at the end of dma_debug_init */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static bool dma_debug_initialized __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static inline bool dma_debug_disabled(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return global_disable || !dma_debug_initialized;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /* Global error count */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static u32 error_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) /* Global error show enable*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static u32 show_all_errors __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) /* Number of errors to show */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) static u32 show_num_errors = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static u32 num_free_entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static u32 min_free_entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static u32 nr_total_entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) /* number of preallocated entries requested by kernel cmdline */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) static u32 nr_prealloc_entries = PREALLOC_DMA_DEBUG_ENTRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) /* per-driver filter related state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) #define NAME_MAX_LEN 64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static char current_driver_name[NAME_MAX_LEN] __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static struct device_driver *current_driver __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static DEFINE_RWLOCK(driver_name_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) static const char *const maperr2str[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) [MAP_ERR_CHECK_NOT_APPLICABLE] = "dma map error check not applicable",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) [MAP_ERR_NOT_CHECKED] = "dma map error not checked",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) [MAP_ERR_CHECKED] = "dma map error checked",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static const char *type2name[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) [dma_debug_single] = "single",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) [dma_debug_sg] = "scather-gather",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) [dma_debug_coherent] = "coherent",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) [dma_debug_resource] = "resource",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static const char *dir2name[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) [DMA_BIDIRECTIONAL] = "DMA_BIDIRECTIONAL",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) [DMA_TO_DEVICE] = "DMA_TO_DEVICE",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) [DMA_FROM_DEVICE] = "DMA_FROM_DEVICE",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) [DMA_NONE] = "DMA_NONE",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * The access to some variables in this macro is racy. We can't use atomic_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) * here because all these variables are exported to debugfs. Some of them even
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) * writeable. This is also the reason why a lock won't help much. But anyway,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) * the races are no big deal. Here is why:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) * error_count: the addition is racy, but the worst thing that can happen is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * that we don't count some errors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) * show_num_errors: the subtraction is racy. Also no big deal because in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) * worst case this will result in one warning more in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * system log than the user configured. This variable is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * writeable via debugfs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static inline void dump_entry_trace(struct dma_debug_entry *entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) #ifdef CONFIG_STACKTRACE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) if (entry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) pr_warn("Mapped at:\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) stack_trace_print(entry->stack_entries, entry->stack_len, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static bool driver_filter(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) struct device_driver *drv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) bool ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) /* driver filter off */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) if (likely(!current_driver_name[0]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) /* driver filter on and initialized */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (current_driver && dev && dev->driver == current_driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) /* driver filter on, but we can't filter on a NULL device... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if (current_driver || !current_driver_name[0])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) /* driver filter on but not yet initialized */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) drv = dev->driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) if (!drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) /* lock to protect against change of current_driver_name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) read_lock_irqsave(&driver_name_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) ret = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) if (drv->name &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) strncmp(current_driver_name, drv->name, NAME_MAX_LEN - 1) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) current_driver = drv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) ret = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) read_unlock_irqrestore(&driver_name_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) #define err_printk(dev, entry, format, arg...) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) error_count += 1; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) if (driver_filter(dev) && \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) (show_all_errors || show_num_errors > 0)) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) WARN(1, pr_fmt("%s %s: ") format, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) dev ? dev_driver_string(dev) : "NULL", \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) dev ? dev_name(dev) : "NULL", ## arg); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) dump_entry_trace(entry); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) if (!show_all_errors && show_num_errors > 0) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) show_num_errors -= 1; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) } while (0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) * Hash related functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) * Every DMA-API request is saved into a struct dma_debug_entry. To
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) * have quick access to these structs they are stored into a hash.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) static int hash_fn(struct dma_debug_entry *entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) * Hash function is based on the dma address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) * We use bits 20-27 here as the index into the hash
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) * Request exclusive access to a hash bucket for a given dma_debug_entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) unsigned long *flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) __acquires(&dma_entry_hash[idx].lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) int idx = hash_fn(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) unsigned long __flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) *flags = __flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) return &dma_entry_hash[idx];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * Give up exclusive access to the hash bucket
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) static void put_hash_bucket(struct hash_bucket *bucket,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) __releases(&bucket->lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) spin_unlock_irqrestore(&bucket->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) static bool exact_match(struct dma_debug_entry *a, struct dma_debug_entry *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) return ((a->dev_addr == b->dev_addr) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) (a->dev == b->dev)) ? true : false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) static bool containing_match(struct dma_debug_entry *a,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) struct dma_debug_entry *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) if (a->dev != b->dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if ((b->dev_addr <= a->dev_addr) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) ((b->dev_addr + b->size) >= (a->dev_addr + a->size)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) * Search a given entry in the hash bucket list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) static struct dma_debug_entry *__hash_bucket_find(struct hash_bucket *bucket,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) struct dma_debug_entry *ref,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) match_fn match)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) struct dma_debug_entry *entry, *ret = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) int matches = 0, match_lvl, last_lvl = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) list_for_each_entry(entry, &bucket->list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) if (!match(ref, entry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) * Some drivers map the same physical address multiple
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) * times. Without a hardware IOMMU this results in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) * same device addresses being put into the dma-debug
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) * hash multiple times too. This can result in false
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) * positives being reported. Therefore we implement a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) * best-fit algorithm here which returns the entry from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * the hash which fits best to the reference value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) * instead of the first-fit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) matches += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) match_lvl = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) entry->size == ref->size ? ++match_lvl : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) entry->type == ref->type ? ++match_lvl : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) entry->direction == ref->direction ? ++match_lvl : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) entry->sg_call_ents == ref->sg_call_ents ? ++match_lvl : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) if (match_lvl == 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) /* perfect-fit - return the result */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) return entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) } else if (match_lvl > last_lvl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) * We found an entry that fits better then the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) * previous one or it is the 1st match.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) last_lvl = match_lvl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) ret = entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) * If we have multiple matches but no perfect-fit, just return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) * NULL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) ret = (matches == 1) ? ret : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) static struct dma_debug_entry *bucket_find_exact(struct hash_bucket *bucket,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) struct dma_debug_entry *ref)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) return __hash_bucket_find(bucket, ref, exact_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) static struct dma_debug_entry *bucket_find_contain(struct hash_bucket **bucket,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) struct dma_debug_entry *ref,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) unsigned long *flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) unsigned int max_range = dma_get_max_seg_size(ref->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) struct dma_debug_entry *entry, index = *ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) unsigned int range = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) while (range <= max_range) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) entry = __hash_bucket_find(*bucket, ref, containing_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) if (entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) return entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) * Nothing found, go back a hash bucket
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) put_hash_bucket(*bucket, *flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) range += (1 << HASH_FN_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) index.dev_addr -= (1 << HASH_FN_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) *bucket = get_hash_bucket(&index, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) * Add an entry to a hash bucket
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) static void hash_bucket_add(struct hash_bucket *bucket,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) struct dma_debug_entry *entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) list_add_tail(&entry->list, &bucket->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) * Remove entry from a hash bucket list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) static void hash_bucket_del(struct dma_debug_entry *entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) list_del(&entry->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) static unsigned long long phys_addr(struct dma_debug_entry *entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) if (entry->type == dma_debug_resource)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) return __pfn_to_phys(entry->pfn) + entry->offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) return page_to_phys(pfn_to_page(entry->pfn)) + entry->offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) * Dump mapping entries for debugging purposes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) void debug_dma_dump_mappings(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) for (idx = 0; idx < HASH_SIZE; idx++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) struct hash_bucket *bucket = &dma_entry_hash[idx];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) struct dma_debug_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) spin_lock_irqsave(&bucket->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) list_for_each_entry(entry, &bucket->list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) if (!dev || dev == entry->dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) dev_info(entry->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) "%s idx %d P=%Lx N=%lx D=%Lx L=%Lx %s %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) type2name[entry->type], idx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) phys_addr(entry), entry->pfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) entry->dev_addr, entry->size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) dir2name[entry->direction],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) maperr2str[entry->map_err_type]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) spin_unlock_irqrestore(&bucket->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) * For each mapping (initial cacheline in the case of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) * dma_alloc_coherent/dma_map_page, initial cacheline in each page of a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) * scatterlist, or the cacheline specified in dma_map_single) insert
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) * into this tree using the cacheline as the key. At
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) * dma_unmap_{single|sg|page} or dma_free_coherent delete the entry. If
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) * the entry already exists at insertion time add a tag as a reference
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) * count for the overlapping mappings. For now, the overlap tracking
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) * just ensures that 'unmaps' balance 'maps' before marking the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) * cacheline idle, but we should also be flagging overlaps as an API
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) * violation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) * Memory usage is mostly constrained by the maximum number of available
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) * dma-debug entries in that we need a free dma_debug_entry before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) * inserting into the tree. In the case of dma_map_page and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) * dma_alloc_coherent there is only one dma_debug_entry and one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) * dma_active_cacheline entry to track per event. dma_map_sg(), on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) * other hand, consumes a single dma_debug_entry, but inserts 'nents'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) * entries into the tree.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) static RADIX_TREE(dma_active_cacheline, GFP_NOWAIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) static DEFINE_SPINLOCK(radix_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) #define ACTIVE_CACHELINE_MAX_OVERLAP ((1 << RADIX_TREE_MAX_TAGS) - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) #define CACHELINE_PER_PAGE_SHIFT (PAGE_SHIFT - L1_CACHE_SHIFT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) #define CACHELINES_PER_PAGE (1 << CACHELINE_PER_PAGE_SHIFT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) static phys_addr_t to_cacheline_number(struct dma_debug_entry *entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) return (entry->pfn << CACHELINE_PER_PAGE_SHIFT) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) (entry->offset >> L1_CACHE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) static int active_cacheline_read_overlap(phys_addr_t cln)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) int overlap = 0, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (radix_tree_tag_get(&dma_active_cacheline, cln, i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) overlap |= 1 << i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) return overlap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) static int active_cacheline_set_overlap(phys_addr_t cln, int overlap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) if (overlap > ACTIVE_CACHELINE_MAX_OVERLAP || overlap < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) return overlap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) if (overlap & 1 << i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) radix_tree_tag_set(&dma_active_cacheline, cln, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) radix_tree_tag_clear(&dma_active_cacheline, cln, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) return overlap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) static void active_cacheline_inc_overlap(phys_addr_t cln)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) int overlap = active_cacheline_read_overlap(cln);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) overlap = active_cacheline_set_overlap(cln, ++overlap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) /* If we overflowed the overlap counter then we're potentially
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) * leaking dma-mappings.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) WARN_ONCE(overlap > ACTIVE_CACHELINE_MAX_OVERLAP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) pr_fmt("exceeded %d overlapping mappings of cacheline %pa\n"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) ACTIVE_CACHELINE_MAX_OVERLAP, &cln);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) static int active_cacheline_dec_overlap(phys_addr_t cln)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) int overlap = active_cacheline_read_overlap(cln);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) return active_cacheline_set_overlap(cln, --overlap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) static int active_cacheline_insert(struct dma_debug_entry *entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) phys_addr_t cln = to_cacheline_number(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) /* If the device is not writing memory then we don't have any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) * concerns about the cpu consuming stale data. This mitigates
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) * legitimate usages of overlapping mappings.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) if (entry->direction == DMA_TO_DEVICE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) spin_lock_irqsave(&radix_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) rc = radix_tree_insert(&dma_active_cacheline, cln, entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) if (rc == -EEXIST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) active_cacheline_inc_overlap(cln);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) spin_unlock_irqrestore(&radix_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) static void active_cacheline_remove(struct dma_debug_entry *entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) phys_addr_t cln = to_cacheline_number(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) /* ...mirror the insert case */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) if (entry->direction == DMA_TO_DEVICE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) spin_lock_irqsave(&radix_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) /* since we are counting overlaps the final put of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) * cacheline will occur when the overlap count is 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) * active_cacheline_dec_overlap() returns -1 in that case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) if (active_cacheline_dec_overlap(cln) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) radix_tree_delete(&dma_active_cacheline, cln);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) spin_unlock_irqrestore(&radix_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) * Wrapper function for adding an entry to the hash.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) * This function takes care of locking itself.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) static void add_dma_entry(struct dma_debug_entry *entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) struct hash_bucket *bucket;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) bucket = get_hash_bucket(entry, &flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) hash_bucket_add(bucket, entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) put_hash_bucket(bucket, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) rc = active_cacheline_insert(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) if (rc == -ENOMEM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) pr_err("cacheline tracking ENOMEM, dma-debug disabled\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) global_disable = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) /* TODO: report -EEXIST errors here as overlapping mappings are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) * not supported by the DMA API
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) static int dma_debug_create_entries(gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) struct dma_debug_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) entry = (void *)get_zeroed_page(gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) if (!entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) for (i = 0; i < DMA_DEBUG_DYNAMIC_ENTRIES; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) list_add_tail(&entry[i].list, &free_entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) num_free_entries += DMA_DEBUG_DYNAMIC_ENTRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) nr_total_entries += DMA_DEBUG_DYNAMIC_ENTRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) static struct dma_debug_entry *__dma_entry_alloc(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) struct dma_debug_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) entry = list_entry(free_entries.next, struct dma_debug_entry, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) list_del(&entry->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) memset(entry, 0, sizeof(*entry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) num_free_entries -= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) if (num_free_entries < min_free_entries)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) min_free_entries = num_free_entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) return entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) static void __dma_entry_alloc_check_leak(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) u32 tmp = nr_total_entries % nr_prealloc_entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) /* Shout each time we tick over some multiple of the initial pool */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) if (tmp < DMA_DEBUG_DYNAMIC_ENTRIES) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) pr_info("dma_debug_entry pool grown to %u (%u00%%)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) nr_total_entries,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) (nr_total_entries / nr_prealloc_entries));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) /* struct dma_entry allocator
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) * The next two functions implement the allocator for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) * struct dma_debug_entries.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) static struct dma_debug_entry *dma_entry_alloc(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) struct dma_debug_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) spin_lock_irqsave(&free_entries_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) if (num_free_entries == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) if (dma_debug_create_entries(GFP_ATOMIC)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) global_disable = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) spin_unlock_irqrestore(&free_entries_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) pr_err("debugging out of memory - disabling\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) __dma_entry_alloc_check_leak();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) entry = __dma_entry_alloc();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) spin_unlock_irqrestore(&free_entries_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) #ifdef CONFIG_STACKTRACE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) entry->stack_len = stack_trace_save(entry->stack_entries,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) ARRAY_SIZE(entry->stack_entries),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) return entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) static void dma_entry_free(struct dma_debug_entry *entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) active_cacheline_remove(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) * add to beginning of the list - this way the entries are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) * more likely cache hot when they are reallocated.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) spin_lock_irqsave(&free_entries_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) list_add(&entry->list, &free_entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) num_free_entries += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) spin_unlock_irqrestore(&free_entries_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) * DMA-API debugging init code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) * The init code does two things:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) * 1. Initialize core data structures
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) * 2. Preallocate a given number of dma_debug_entry structs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) static ssize_t filter_read(struct file *file, char __user *user_buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) char buf[NAME_MAX_LEN + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) if (!current_driver_name[0])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) * We can't copy to userspace directly because current_driver_name can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) * only be read under the driver_name_lock with irqs disabled. So
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) * create a temporary copy first.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) read_lock_irqsave(&driver_name_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) len = scnprintf(buf, NAME_MAX_LEN + 1, "%s\n", current_driver_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) read_unlock_irqrestore(&driver_name_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) return simple_read_from_buffer(user_buf, count, ppos, buf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) static ssize_t filter_write(struct file *file, const char __user *userbuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) char buf[NAME_MAX_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) size_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) * We can't copy from userspace directly. Access to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) * current_driver_name is protected with a write_lock with irqs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) * disabled. Since copy_from_user can fault and may sleep we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) * need to copy to temporary buffer first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) len = min(count, (size_t)(NAME_MAX_LEN - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) if (copy_from_user(buf, userbuf, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) buf[len] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) write_lock_irqsave(&driver_name_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) * Now handle the string we got from userspace very carefully.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) * The rules are:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) * - only use the first token we got
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) * - token delimiter is everything looking like a space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) * character (' ', '\n', '\t' ...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) if (!isalnum(buf[0])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) * If the first character userspace gave us is not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) * alphanumerical then assume the filter should be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) * switched off.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) if (current_driver_name[0])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) pr_info("switching off dma-debug driver filter\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) current_driver_name[0] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) current_driver = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) * Now parse out the first token and use it as the name for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) * driver to filter for.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) for (i = 0; i < NAME_MAX_LEN - 1; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) current_driver_name[i] = buf[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) current_driver_name[i] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) current_driver = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) pr_info("enable driver filter for driver [%s]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) current_driver_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) write_unlock_irqrestore(&driver_name_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) static const struct file_operations filter_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) .read = filter_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) .write = filter_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) .llseek = default_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) static int dump_show(struct seq_file *seq, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) for (idx = 0; idx < HASH_SIZE; idx++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) struct hash_bucket *bucket = &dma_entry_hash[idx];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) struct dma_debug_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) spin_lock_irqsave(&bucket->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) list_for_each_entry(entry, &bucket->list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) seq_printf(seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) "%s %s %s idx %d P=%llx N=%lx D=%llx L=%llx %s %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) dev_name(entry->dev),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) dev_driver_string(entry->dev),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) type2name[entry->type], idx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) phys_addr(entry), entry->pfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) entry->dev_addr, entry->size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) dir2name[entry->direction],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) maperr2str[entry->map_err_type]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) spin_unlock_irqrestore(&bucket->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) DEFINE_SHOW_ATTRIBUTE(dump);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) static int __init dma_debug_fs_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) struct dentry *dentry = debugfs_create_dir("dma-api", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) debugfs_create_bool("disabled", 0444, dentry, &global_disable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) debugfs_create_u32("error_count", 0444, dentry, &error_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) debugfs_create_u32("all_errors", 0644, dentry, &show_all_errors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) debugfs_create_u32("num_errors", 0644, dentry, &show_num_errors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) debugfs_create_u32("num_free_entries", 0444, dentry, &num_free_entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) debugfs_create_u32("min_free_entries", 0444, dentry, &min_free_entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) debugfs_create_u32("nr_total_entries", 0444, dentry, &nr_total_entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) debugfs_create_file("driver_filter", 0644, dentry, NULL, &filter_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) debugfs_create_file("dump", 0444, dentry, NULL, &dump_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) core_initcall_sync(dma_debug_fs_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) struct dma_debug_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) int count = 0, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) for (i = 0; i < HASH_SIZE; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) spin_lock_irqsave(&dma_entry_hash[i].lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) list_for_each_entry(entry, &dma_entry_hash[i].list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) if (entry->dev == dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) count += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) *out_entry = entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) spin_unlock_irqrestore(&dma_entry_hash[i].lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) static int dma_debug_device_change(struct notifier_block *nb, unsigned long action, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) struct device *dev = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) struct dma_debug_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) int count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) if (dma_debug_disabled())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) switch (action) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) case BUS_NOTIFY_UNBOUND_DRIVER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) count = device_dma_allocations(dev, &entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) if (count == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) err_printk(dev, entry, "device driver has pending "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) "DMA allocations while released from device "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) "[count=%d]\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) "One of leaked entries details: "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) "[device address=0x%016llx] [size=%llu bytes] "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) "[mapped with %s] [mapped as %s]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) count, entry->dev_addr, entry->size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) dir2name[entry->direction], type2name[entry->type]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) void dma_debug_add_bus(struct bus_type *bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) struct notifier_block *nb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) if (dma_debug_disabled())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) if (nb == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) pr_err("dma_debug_add_bus: out of memory\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) nb->notifier_call = dma_debug_device_change;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) bus_register_notifier(bus, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) static int dma_debug_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) int i, nr_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) /* Do not use dma_debug_initialized here, since we really want to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) * called to set dma_debug_initialized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) if (global_disable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) for (i = 0; i < HASH_SIZE; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) INIT_LIST_HEAD(&dma_entry_hash[i].list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) spin_lock_init(&dma_entry_hash[i].lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) nr_pages = DIV_ROUND_UP(nr_prealloc_entries, DMA_DEBUG_DYNAMIC_ENTRIES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) for (i = 0; i < nr_pages; ++i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) dma_debug_create_entries(GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) if (num_free_entries >= nr_prealloc_entries) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) pr_info("preallocated %d debug entries\n", nr_total_entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) } else if (num_free_entries > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) pr_warn("%d debug entries requested but only %d allocated\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) nr_prealloc_entries, nr_total_entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) pr_err("debugging out of memory error - disabled\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) global_disable = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) min_free_entries = num_free_entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) dma_debug_initialized = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) pr_info("debugging enabled by kernel config\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) core_initcall(dma_debug_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) static __init int dma_debug_cmdline(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) if (!str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) if (strncmp(str, "off", 3) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) pr_info("debugging disabled on kernel command line\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) global_disable = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) static __init int dma_debug_entries_cmdline(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) if (!str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) if (!get_option(&str, &nr_prealloc_entries))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) nr_prealloc_entries = PREALLOC_DMA_DEBUG_ENTRIES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) __setup("dma_debug=", dma_debug_cmdline);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) __setup("dma_debug_entries=", dma_debug_entries_cmdline);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) static void check_unmap(struct dma_debug_entry *ref)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) struct dma_debug_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) struct hash_bucket *bucket;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) bucket = get_hash_bucket(ref, &flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) entry = bucket_find_exact(bucket, ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) if (!entry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) /* must drop lock before calling dma_mapping_error */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) put_hash_bucket(bucket, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) if (dma_mapping_error(ref->dev, ref->dev_addr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) err_printk(ref->dev, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) "device driver tries to free an "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) "invalid DMA memory address\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) err_printk(ref->dev, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) "device driver tries to free DMA "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) "memory it has not allocated [device "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) "address=0x%016llx] [size=%llu bytes]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) ref->dev_addr, ref->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) if (ref->size != entry->size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) err_printk(ref->dev, entry, "device driver frees "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) "DMA memory with different size "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) "[device address=0x%016llx] [map size=%llu bytes] "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) "[unmap size=%llu bytes]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) ref->dev_addr, entry->size, ref->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) if (ref->type != entry->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) err_printk(ref->dev, entry, "device driver frees "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) "DMA memory with wrong function "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) "[device address=0x%016llx] [size=%llu bytes] "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) "[mapped as %s] [unmapped as %s]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) ref->dev_addr, ref->size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) type2name[entry->type], type2name[ref->type]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) } else if ((entry->type == dma_debug_coherent) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) (phys_addr(ref) != phys_addr(entry))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) err_printk(ref->dev, entry, "device driver frees "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) "DMA memory with different CPU address "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) "[device address=0x%016llx] [size=%llu bytes] "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) "[cpu alloc address=0x%016llx] "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) "[cpu free address=0x%016llx]",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) ref->dev_addr, ref->size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) phys_addr(entry),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) phys_addr(ref));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) if (ref->sg_call_ents && ref->type == dma_debug_sg &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) ref->sg_call_ents != entry->sg_call_ents) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) err_printk(ref->dev, entry, "device driver frees "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) "DMA sg list with different entry count "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) "[map count=%d] [unmap count=%d]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) entry->sg_call_ents, ref->sg_call_ents);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) * This may be no bug in reality - but most implementations of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) * DMA API don't handle this properly, so check for it here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) if (ref->direction != entry->direction) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) err_printk(ref->dev, entry, "device driver frees "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) "DMA memory with different direction "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) "[device address=0x%016llx] [size=%llu bytes] "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) "[mapped with %s] [unmapped with %s]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) ref->dev_addr, ref->size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) dir2name[entry->direction],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) dir2name[ref->direction]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) * Drivers should use dma_mapping_error() to check the returned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) * addresses of dma_map_single() and dma_map_page().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) * If not, print this warning message. See Documentation/core-api/dma-api.rst.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) if (entry->map_err_type == MAP_ERR_NOT_CHECKED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) err_printk(ref->dev, entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) "device driver failed to check map error"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) "[device address=0x%016llx] [size=%llu bytes] "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) "[mapped as %s]",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) ref->dev_addr, ref->size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) type2name[entry->type]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) hash_bucket_del(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) dma_entry_free(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) put_hash_bucket(bucket, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) static void check_for_stack(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) struct page *page, size_t offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) void *addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) struct vm_struct *stack_vm_area = task_stack_vm_area(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) if (!stack_vm_area) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) /* Stack is direct-mapped. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) if (PageHighMem(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) addr = page_address(page) + offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) if (object_is_on_stack(addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) err_printk(dev, NULL, "device driver maps memory from stack [addr=%p]\n", addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) /* Stack is vmalloced. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) for (i = 0; i < stack_vm_area->nr_pages; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) if (page != stack_vm_area->pages[i])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) addr = (u8 *)current->stack + i * PAGE_SIZE + offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) err_printk(dev, NULL, "device driver maps memory from stack [probable addr=%p]\n", addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) static inline bool overlap(void *addr, unsigned long len, void *start, void *end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) unsigned long a1 = (unsigned long)addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) unsigned long b1 = a1 + len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) unsigned long a2 = (unsigned long)start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) unsigned long b2 = (unsigned long)end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) return !(b1 <= a2 || a1 >= b2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) if (overlap(addr, len, _stext, _etext) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) overlap(addr, len, __start_rodata, __end_rodata))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) err_printk(dev, NULL, "device driver maps memory from kernel text or rodata [addr=%p] [len=%lu]\n", addr, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) static void check_sync(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) struct dma_debug_entry *ref,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) bool to_cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) struct dma_debug_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) struct hash_bucket *bucket;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) bucket = get_hash_bucket(ref, &flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) entry = bucket_find_contain(&bucket, ref, &flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) if (!entry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) err_printk(dev, NULL, "device driver tries "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) "to sync DMA memory it has not allocated "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) "[device address=0x%016llx] [size=%llu bytes]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) (unsigned long long)ref->dev_addr, ref->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) if (ref->size > entry->size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) err_printk(dev, entry, "device driver syncs"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) " DMA memory outside allocated range "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) "[device address=0x%016llx] "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) "[allocation size=%llu bytes] "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) "[sync offset+size=%llu]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) entry->dev_addr, entry->size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) ref->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) if (entry->direction == DMA_BIDIRECTIONAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) if (ref->direction != entry->direction) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) err_printk(dev, entry, "device driver syncs "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) "DMA memory with different direction "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) "[device address=0x%016llx] [size=%llu bytes] "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) "[mapped with %s] [synced with %s]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) (unsigned long long)ref->dev_addr, entry->size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) dir2name[entry->direction],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) dir2name[ref->direction]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) !(ref->direction == DMA_TO_DEVICE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) err_printk(dev, entry, "device driver syncs "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) "device read-only DMA memory for cpu "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) "[device address=0x%016llx] [size=%llu bytes] "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) "[mapped with %s] [synced with %s]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) (unsigned long long)ref->dev_addr, entry->size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) dir2name[entry->direction],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) dir2name[ref->direction]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) !(ref->direction == DMA_FROM_DEVICE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) err_printk(dev, entry, "device driver syncs "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) "device write-only DMA memory to device "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) "[device address=0x%016llx] [size=%llu bytes] "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) "[mapped with %s] [synced with %s]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) (unsigned long long)ref->dev_addr, entry->size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) dir2name[entry->direction],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) dir2name[ref->direction]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) /* sg list count can be less than map count when partial cache sync */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) if (ref->sg_call_ents && ref->type == dma_debug_sg &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) ref->sg_call_ents > entry->sg_call_ents) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) err_printk(ref->dev, entry, "device driver syncs "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) "DMA sg list count larger than map count "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) "[map count=%d] [sync count=%d]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) entry->sg_call_ents, ref->sg_call_ents);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) put_hash_bucket(bucket, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) static void check_sg_segment(struct device *dev, struct scatterlist *sg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) #ifdef CONFIG_DMA_API_DEBUG_SG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) unsigned int max_seg = dma_get_max_seg_size(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) u64 start, end, boundary = dma_get_seg_boundary(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) * Either the driver forgot to set dma_parms appropriately, or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) * whoever generated the list forgot to check them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) if (sg->length > max_seg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) err_printk(dev, NULL, "mapping sg segment longer than device claims to support [len=%u] [max=%u]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) sg->length, max_seg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) * In some cases this could potentially be the DMA API
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) * implementation's fault, but it would usually imply that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) * the scatterlist was built inappropriately to begin with.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) start = sg_dma_address(sg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) end = start + sg_dma_len(sg) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) if ((start ^ end) & ~boundary)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) err_printk(dev, NULL, "mapping sg segment across boundary [start=0x%016llx] [end=0x%016llx] [boundary=0x%016llx]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) start, end, boundary);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) void debug_dma_map_single(struct device *dev, const void *addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) unsigned long len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) if (unlikely(dma_debug_disabled()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) if (!virt_addr_valid(addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) err_printk(dev, NULL, "device driver maps memory from invalid area [addr=%p] [len=%lu]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) addr, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) if (is_vmalloc_addr(addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) err_printk(dev, NULL, "device driver maps memory from vmalloc area [addr=%p] [len=%lu]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) addr, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) EXPORT_SYMBOL(debug_dma_map_single);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) size_t size, int direction, dma_addr_t dma_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) struct dma_debug_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) if (unlikely(dma_debug_disabled()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) if (dma_mapping_error(dev, dma_addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) entry = dma_entry_alloc();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) if (!entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) entry->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) entry->type = dma_debug_single;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) entry->pfn = page_to_pfn(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) entry->offset = offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) entry->dev_addr = dma_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) entry->size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) entry->direction = direction;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) entry->map_err_type = MAP_ERR_NOT_CHECKED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) check_for_stack(dev, page, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) if (!PageHighMem(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) void *addr = page_address(page) + offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) check_for_illegal_area(dev, addr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) add_dma_entry(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) struct dma_debug_entry ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) struct dma_debug_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) struct hash_bucket *bucket;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) if (unlikely(dma_debug_disabled()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) ref.dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) ref.dev_addr = dma_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) bucket = get_hash_bucket(&ref, &flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) list_for_each_entry(entry, &bucket->list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) if (!exact_match(&ref, entry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) * The same physical address can be mapped multiple
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) * times. Without a hardware IOMMU this results in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) * same device addresses being put into the dma-debug
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) * hash multiple times too. This can result in false
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) * positives being reported. Therefore we implement a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) * best-fit algorithm here which updates the first entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) * from the hash which fits the reference value and is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) * not currently listed as being checked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) if (entry->map_err_type == MAP_ERR_NOT_CHECKED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) entry->map_err_type = MAP_ERR_CHECKED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) put_hash_bucket(bucket, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) EXPORT_SYMBOL(debug_dma_mapping_error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) size_t size, int direction)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) struct dma_debug_entry ref = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) .type = dma_debug_single,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) .dev = dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) .dev_addr = addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) .size = size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) .direction = direction,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) if (unlikely(dma_debug_disabled()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) check_unmap(&ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) int nents, int mapped_ents, int direction)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) struct dma_debug_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) struct scatterlist *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) if (unlikely(dma_debug_disabled()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) for_each_sg(sg, s, nents, i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) check_for_stack(dev, sg_page(s), s->offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) if (!PageHighMem(sg_page(s)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) check_for_illegal_area(dev, sg_virt(s), s->length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) for_each_sg(sg, s, mapped_ents, i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) entry = dma_entry_alloc();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) if (!entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) entry->type = dma_debug_sg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) entry->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) entry->pfn = page_to_pfn(sg_page(s));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) entry->offset = s->offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) entry->size = sg_dma_len(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320) entry->dev_addr = sg_dma_address(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) entry->direction = direction;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) entry->sg_call_ents = nents;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) entry->sg_mapped_ents = mapped_ents;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) check_sg_segment(dev, s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) add_dma_entry(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) static int get_nr_mapped_entries(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) struct dma_debug_entry *ref)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) struct dma_debug_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) struct hash_bucket *bucket;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) int mapped_ents;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) bucket = get_hash_bucket(ref, &flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) entry = bucket_find_exact(bucket, ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) mapped_ents = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) if (entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344) mapped_ents = entry->sg_mapped_ents;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) put_hash_bucket(bucket, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) return mapped_ents;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) int nelems, int dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) struct scatterlist *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) int mapped_ents = 0, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) if (unlikely(dma_debug_disabled()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) for_each_sg(sglist, s, nelems, i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) struct dma_debug_entry ref = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) .type = dma_debug_sg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) .dev = dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) .pfn = page_to_pfn(sg_page(s)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) .offset = s->offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) .dev_addr = sg_dma_address(s),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) .size = sg_dma_len(s),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) .direction = dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369) .sg_call_ents = nelems,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) if (mapped_ents && i >= mapped_ents)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) if (!i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) mapped_ents = get_nr_mapped_entries(dev, &ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) check_unmap(&ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) void debug_dma_alloc_coherent(struct device *dev, size_t size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) dma_addr_t dma_addr, void *virt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) struct dma_debug_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) if (unlikely(dma_debug_disabled()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) if (unlikely(virt == NULL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) /* handle vmalloc and linear addresses */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) if (!is_vmalloc_addr(virt) && !virt_addr_valid(virt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) entry = dma_entry_alloc();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) if (!entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) entry->type = dma_debug_coherent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) entry->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) entry->offset = offset_in_page(virt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) entry->size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) entry->dev_addr = dma_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) entry->direction = DMA_BIDIRECTIONAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) if (is_vmalloc_addr(virt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) entry->pfn = vmalloc_to_pfn(virt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) entry->pfn = page_to_pfn(virt_to_page(virt));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) add_dma_entry(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) void debug_dma_free_coherent(struct device *dev, size_t size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417) void *virt, dma_addr_t addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) struct dma_debug_entry ref = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) .type = dma_debug_coherent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) .dev = dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) .offset = offset_in_page(virt),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) .dev_addr = addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424) .size = size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) .direction = DMA_BIDIRECTIONAL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) /* handle vmalloc and linear addresses */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) if (!is_vmalloc_addr(virt) && !virt_addr_valid(virt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432) if (is_vmalloc_addr(virt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) ref.pfn = vmalloc_to_pfn(virt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) ref.pfn = page_to_pfn(virt_to_page(virt));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) if (unlikely(dma_debug_disabled()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) check_unmap(&ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) void debug_dma_map_resource(struct device *dev, phys_addr_t addr, size_t size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) int direction, dma_addr_t dma_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) struct dma_debug_entry *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) if (unlikely(dma_debug_disabled()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451) entry = dma_entry_alloc();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) if (!entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455) entry->type = dma_debug_resource;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456) entry->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) entry->pfn = PHYS_PFN(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458) entry->offset = offset_in_page(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459) entry->size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) entry->dev_addr = dma_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461) entry->direction = direction;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) entry->map_err_type = MAP_ERR_NOT_CHECKED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464) add_dma_entry(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467) void debug_dma_unmap_resource(struct device *dev, dma_addr_t dma_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468) size_t size, int direction)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470) struct dma_debug_entry ref = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) .type = dma_debug_resource,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472) .dev = dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473) .dev_addr = dma_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) .size = size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475) .direction = direction,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) if (unlikely(dma_debug_disabled()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481) check_unmap(&ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484) void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) size_t size, int direction)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487) struct dma_debug_entry ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489) if (unlikely(dma_debug_disabled()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492) ref.type = dma_debug_single;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493) ref.dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494) ref.dev_addr = dma_handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) ref.size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496) ref.direction = direction;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497) ref.sg_call_ents = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499) check_sync(dev, &ref, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502) void debug_dma_sync_single_for_device(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503) dma_addr_t dma_handle, size_t size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504) int direction)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506) struct dma_debug_entry ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508) if (unlikely(dma_debug_disabled()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) ref.type = dma_debug_single;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512) ref.dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513) ref.dev_addr = dma_handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514) ref.size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515) ref.direction = direction;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516) ref.sg_call_ents = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518) check_sync(dev, &ref, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521) void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522) int nelems, int direction)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524) struct scatterlist *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) int mapped_ents = 0, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527) if (unlikely(dma_debug_disabled()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) for_each_sg(sg, s, nelems, i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532) struct dma_debug_entry ref = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) .type = dma_debug_sg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534) .dev = dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535) .pfn = page_to_pfn(sg_page(s)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536) .offset = s->offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537) .dev_addr = sg_dma_address(s),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538) .size = sg_dma_len(s),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539) .direction = direction,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) .sg_call_ents = nelems,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543) if (!i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544) mapped_ents = get_nr_mapped_entries(dev, &ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1546) if (i >= mapped_ents)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1547) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1549) check_sync(dev, &ref, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1550) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1551) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1553) void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1554) int nelems, int direction)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1555) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1556) struct scatterlist *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1557) int mapped_ents = 0, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1559) if (unlikely(dma_debug_disabled()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1560) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1562) for_each_sg(sg, s, nelems, i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1564) struct dma_debug_entry ref = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1565) .type = dma_debug_sg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1566) .dev = dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1567) .pfn = page_to_pfn(sg_page(s)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1568) .offset = s->offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1569) .dev_addr = sg_dma_address(s),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1570) .size = sg_dma_len(s),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1571) .direction = direction,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1572) .sg_call_ents = nelems,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1573) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1574) if (!i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1575) mapped_ents = get_nr_mapped_entries(dev, &ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1576)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1577) if (i >= mapped_ents)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1578) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1580) check_sync(dev, &ref, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1581) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1582) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1583)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1584) static int __init dma_debug_driver_setup(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1585) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1586) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1587)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1588) for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1589) current_driver_name[i] = *str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1590) if (*str == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1591) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1592) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1594) if (current_driver_name[0])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1595) pr_info("enable driver filter for driver [%s]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1596) current_driver_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1597)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1599) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1600) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1601) __setup("dma_debug_driver=", dma_debug_driver_setup);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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