^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 © 2006-2009, Intel Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.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) #include <linux/iova.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) /* The anchor node sits above the top of the usable address space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define IOVA_ANCHOR ~0UL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static bool iova_rcache_insert(struct iova_domain *iovad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) unsigned long pfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) unsigned long size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static unsigned long iova_rcache_get(struct iova_domain *iovad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) unsigned long size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) unsigned long limit_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static void init_iova_rcaches(struct iova_domain *iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static void free_iova_rcaches(struct iova_domain *iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static void fq_destroy_all_entries(struct iova_domain *iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static void fq_flush_timeout(struct timer_list *t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static void iova_dump(struct iova_domain *iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static int iova_used_show(struct seq_file *s, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct iova_domain *iovad = s->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct iova *iova, *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) unsigned long flags, cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) unsigned long used_pfn = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) int i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) for_each_online_cpu(cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) free_cpu_cached_iovas(cpu, iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) free_global_cached_iovas(iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) rbtree_postorder_for_each_entry_safe(iova, t, &iovad->rbroot, node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) dma_addr_t start = iova->pfn_lo << iova_shift(iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) dma_addr_t end = iova->pfn_hi << iova_shift(iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) unsigned long pfn = iova->pfn_hi + 1 - iova->pfn_lo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if ((iova->pfn_hi == IOVA_ANCHOR) || (iova->pfn_lo == IOVA_ANCHOR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) seq_printf(s, "%4d: [%pad..%pad] %6luKiB (%4lu - %4lu)MiB\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) i++, &start, &end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) pfn << (PAGE_SHIFT - 10),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) iova->pfn_lo >> (20 - PAGE_SHIFT),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) (iova->pfn_hi + 1) >> (20 - PAGE_SHIFT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) used_pfn += pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) seq_printf(s, "used: %lu MiB\n", used_pfn >> (20 - PAGE_SHIFT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) static struct proc_dir_entry *iova_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) void init_iova_domain_procfs(struct iova_domain *iovad, const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct proc_dir_entry *root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) remove_proc_subtree(name, iova_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) root = proc_mkdir(name, iova_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (!root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) proc_create_single_data("used", 0, root, iova_used_show, iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) EXPORT_SYMBOL_GPL(init_iova_domain_procfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static int __init iova_procfs_create(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (!iova_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) iova_dir = proc_mkdir("iova", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) subsys_initcall(iova_procfs_create);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) init_iova_domain(struct iova_domain *iovad, unsigned long granule,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) unsigned long start_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * IOVA granularity will normally be equal to the smallest
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * supported IOMMU page size; both *must* be capable of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * representing individual CPU pages exactly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) BUG_ON((granule > PAGE_SIZE) || !is_power_of_2(granule));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) spin_lock_init(&iovad->iova_rbtree_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) iovad->rbroot = RB_ROOT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) iovad->cached_node = &iovad->anchor.node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) iovad->cached32_node = &iovad->anchor.node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) iovad->granule = granule;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) iovad->start_pfn = start_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) iovad->dma_32bit_pfn = 1UL << (32 - iova_shift(iovad));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) iovad->max32_alloc_size = iovad->dma_32bit_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) iovad->flush_cb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) iovad->fq = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) iovad->anchor.pfn_lo = iovad->anchor.pfn_hi = IOVA_ANCHOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) rb_link_node(&iovad->anchor.node, NULL, &iovad->rbroot.rb_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) rb_insert_color(&iovad->anchor.node, &iovad->rbroot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) iovad->best_fit = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) init_iova_rcaches(iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) EXPORT_SYMBOL_GPL(init_iova_domain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) bool has_iova_flush_queue(struct iova_domain *iovad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return !!iovad->fq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static void free_iova_flush_queue(struct iova_domain *iovad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (!has_iova_flush_queue(iovad))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) del_timer_sync(&iovad->fq_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) fq_destroy_all_entries(iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) free_percpu(iovad->fq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) iovad->fq = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) iovad->flush_cb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) iovad->entry_dtor = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) int init_iova_flush_queue(struct iova_domain *iovad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) iova_flush_cb flush_cb, iova_entry_dtor entry_dtor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) struct iova_fq __percpu *queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) atomic64_set(&iovad->fq_flush_start_cnt, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) atomic64_set(&iovad->fq_flush_finish_cnt, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) queue = alloc_percpu(struct iova_fq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (!queue)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) iovad->flush_cb = flush_cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) iovad->entry_dtor = entry_dtor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) struct iova_fq *fq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) fq = per_cpu_ptr(queue, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) fq->head = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) fq->tail = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) spin_lock_init(&fq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) smp_wmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) iovad->fq = queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) timer_setup(&iovad->fq_timer, fq_flush_timeout, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) atomic_set(&iovad->fq_timer_on, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) EXPORT_SYMBOL_GPL(init_iova_flush_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) static struct rb_node *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) __get_cached_rbnode(struct iova_domain *iovad, unsigned long limit_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) if (limit_pfn <= iovad->dma_32bit_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) return iovad->cached32_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return iovad->cached_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) __cached_rbnode_insert_update(struct iova_domain *iovad, struct iova *new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) if (new->pfn_hi < iovad->dma_32bit_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) iovad->cached32_node = &new->node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) iovad->cached_node = &new->node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) __cached_rbnode_delete_update(struct iova_domain *iovad, struct iova *free)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) struct iova *cached_iova;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) cached_iova = rb_entry(iovad->cached32_node, struct iova, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) if (free == cached_iova ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) (free->pfn_hi < iovad->dma_32bit_pfn &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) free->pfn_lo >= cached_iova->pfn_lo))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) iovad->cached32_node = rb_next(&free->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) if (free->pfn_lo < iovad->dma_32bit_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) iovad->max32_alloc_size = iovad->dma_32bit_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) cached_iova = rb_entry(iovad->cached_node, struct iova, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) if (free->pfn_lo >= cached_iova->pfn_lo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) iovad->cached_node = rb_next(&free->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) /* Insert the iova into domain rbtree by holding writer lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) iova_insert_rbtree(struct rb_root *root, struct iova *iova,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) struct rb_node *start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) struct rb_node **new, *parent = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) new = (start) ? &start : &(root->rb_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) /* Figure out where to put new node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) while (*new) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) struct iova *this = rb_entry(*new, struct iova, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) parent = *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (iova->pfn_lo < this->pfn_lo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) new = &((*new)->rb_left);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) else if (iova->pfn_lo > this->pfn_lo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) new = &((*new)->rb_right);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) WARN_ON(1); /* this should not happen */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) /* Add new node and rebalance tree. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) rb_link_node(&iova->node, parent, new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) rb_insert_color(&iova->node, root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) #ifdef CONFIG_IOMMU_LIMIT_IOVA_ALIGNMENT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) static unsigned long limit_align_shift(struct iova_domain *iovad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) unsigned long shift)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) unsigned long max_align_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) max_align_shift = CONFIG_IOMMU_IOVA_ALIGNMENT + PAGE_SHIFT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) - iova_shift(iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) return min_t(unsigned long, max_align_shift, shift);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) static unsigned long limit_align_shift(struct iova_domain *iovad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) unsigned long shift)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) return shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) static int __alloc_and_insert_iova_range(struct iova_domain *iovad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) unsigned long size, unsigned long limit_pfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) struct iova *new, bool size_aligned)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) struct rb_node *curr, *prev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) struct iova *curr_iova;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) unsigned long new_pfn, low_pfn_new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) unsigned long align_mask = ~0UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) unsigned long high_pfn = limit_pfn, low_pfn = iovad->start_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) if (size_aligned)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) align_mask <<= limit_align_shift(iovad, fls_long(size - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) /* Walk the tree backwards */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (limit_pfn <= iovad->dma_32bit_pfn &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) size >= iovad->max32_alloc_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) goto iova32_full;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) curr = __get_cached_rbnode(iovad, limit_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) curr_iova = rb_entry(curr, struct iova, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) low_pfn_new = curr_iova->pfn_hi + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) high_pfn = min(high_pfn, curr_iova->pfn_lo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) new_pfn = (high_pfn - size) & align_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) prev = curr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) curr = rb_prev(curr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) curr_iova = rb_entry(curr, struct iova, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) } while (curr && new_pfn <= curr_iova->pfn_hi && new_pfn >= low_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) if (high_pfn < size || new_pfn < low_pfn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) if (low_pfn == iovad->start_pfn && low_pfn_new < limit_pfn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) high_pfn = limit_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) low_pfn = low_pfn_new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) curr = &iovad->anchor.node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) curr_iova = rb_entry(curr, struct iova, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) iovad->max32_alloc_size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) goto iova32_full;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) /* pfn_lo will point to size aligned address if size_aligned is set */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) new->pfn_lo = new_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) new->pfn_hi = new->pfn_lo + size - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) /* If we have 'prev', it's a valid place to start the insertion. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) iova_insert_rbtree(&iovad->rbroot, new, prev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) __cached_rbnode_insert_update(iovad, new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) iova32_full:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) static int __alloc_and_insert_iova_best_fit(struct iova_domain *iovad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) unsigned long size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) unsigned long limit_pfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) struct iova *new, bool size_aligned)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) struct rb_node *curr, *prev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) struct iova *curr_iova, *prev_iova;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) unsigned long align_mask = ~0UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) struct rb_node *candidate_rb_parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) unsigned long new_pfn, candidate_pfn = ~0UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) unsigned long gap, candidate_gap = ~0UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) if (size_aligned)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) align_mask <<= limit_align_shift(iovad, fls_long(size - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) /* Walk the tree backwards */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) curr = &iovad->anchor.node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) prev = rb_prev(curr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) for (; prev; curr = prev, prev = rb_prev(curr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) curr_iova = rb_entry(curr, struct iova, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) prev_iova = rb_entry(prev, struct iova, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) limit_pfn = min(limit_pfn, curr_iova->pfn_lo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) new_pfn = (limit_pfn - size) & align_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) gap = curr_iova->pfn_lo - prev_iova->pfn_hi - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) if ((limit_pfn >= size) && (new_pfn > prev_iova->pfn_hi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) && (gap < candidate_gap)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) candidate_gap = gap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) candidate_pfn = new_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) candidate_rb_parent = curr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) if (gap == size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) goto insert;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) curr_iova = rb_entry(curr, struct iova, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) limit_pfn = min(limit_pfn, curr_iova->pfn_lo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) new_pfn = (limit_pfn - size) & align_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) gap = curr_iova->pfn_lo - iovad->start_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) if (limit_pfn >= size && new_pfn >= iovad->start_pfn &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) gap < candidate_gap) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) candidate_gap = gap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) candidate_pfn = new_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) candidate_rb_parent = curr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) insert:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) if (candidate_pfn == ~0UL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) return -ENOMEM;
^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) /* pfn_lo will point to size aligned address if size_aligned is set */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) new->pfn_lo = candidate_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) new->pfn_hi = new->pfn_lo + size - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) /* If we have 'prev', it's a valid place to start the insertion. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) iova_insert_rbtree(&iovad->rbroot, new, candidate_rb_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) return 0;
^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) static struct kmem_cache *iova_cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) static unsigned int iova_cache_users;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) static DEFINE_MUTEX(iova_cache_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) struct iova *alloc_iova_mem(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) return kmem_cache_zalloc(iova_cache, GFP_ATOMIC | __GFP_NOWARN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) EXPORT_SYMBOL(alloc_iova_mem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) void free_iova_mem(struct iova *iova)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) if (iova->pfn_lo != IOVA_ANCHOR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) kmem_cache_free(iova_cache, iova);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) EXPORT_SYMBOL(free_iova_mem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) int iova_cache_get(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) mutex_lock(&iova_cache_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) if (!iova_cache_users) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) iova_cache = kmem_cache_create(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) "iommu_iova", sizeof(struct iova), 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) SLAB_HWCACHE_ALIGN, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) if (!iova_cache) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) mutex_unlock(&iova_cache_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) pr_err("Couldn't create iova cache\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) iova_cache_users++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) mutex_unlock(&iova_cache_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) EXPORT_SYMBOL_GPL(iova_cache_get);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) void iova_cache_put(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) mutex_lock(&iova_cache_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) if (WARN_ON(!iova_cache_users)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) mutex_unlock(&iova_cache_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) iova_cache_users--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) if (!iova_cache_users)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) kmem_cache_destroy(iova_cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) mutex_unlock(&iova_cache_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) EXPORT_SYMBOL_GPL(iova_cache_put);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) * alloc_iova - allocates an iova
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) * @iovad: - iova domain in question
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) * @size: - size of page frames to allocate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) * @limit_pfn: - max limit address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) * @size_aligned: - set if size_aligned address range is required
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) * This function allocates an iova in the range iovad->start_pfn to limit_pfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) * searching top-down from limit_pfn to iovad->start_pfn. If the size_aligned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) * flag is set then the allocated address iova->pfn_lo will be naturally
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) * aligned on roundup_power_of_two(size).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) struct iova *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) alloc_iova(struct iova_domain *iovad, unsigned long size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) unsigned long limit_pfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) bool size_aligned)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) struct iova *new_iova;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) new_iova = alloc_iova_mem();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) if (!new_iova)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) if (iovad->best_fit) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) ret = __alloc_and_insert_iova_best_fit(iovad, size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) limit_pfn + 1, new_iova, size_aligned);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) ret = __alloc_and_insert_iova_range(iovad, size, limit_pfn + 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) new_iova, size_aligned);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) free_iova_mem(new_iova);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) return NULL;
^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) return new_iova;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) EXPORT_SYMBOL_GPL(alloc_iova);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) static struct iova *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) private_find_iova(struct iova_domain *iovad, unsigned long pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) struct rb_node *node = iovad->rbroot.rb_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) assert_spin_locked(&iovad->iova_rbtree_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) while (node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) struct iova *iova = rb_entry(node, struct iova, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) if (pfn < iova->pfn_lo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) node = node->rb_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) else if (pfn > iova->pfn_hi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) node = node->rb_right;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) return iova; /* pfn falls within iova's range */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) static void private_free_iova(struct iova_domain *iovad, struct iova *iova)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) assert_spin_locked(&iovad->iova_rbtree_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) __cached_rbnode_delete_update(iovad, iova);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) rb_erase(&iova->node, &iovad->rbroot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) free_iova_mem(iova);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) * find_iova - finds an iova for a given pfn
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) * @iovad: - iova domain in question.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) * @pfn: - page frame number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) * This function finds and returns an iova belonging to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) * given doamin which matches the given pfn.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) struct iova *iova;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) /* Take the lock so that no other thread is manipulating the rbtree */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) iova = private_find_iova(iovad, pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) return iova;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) EXPORT_SYMBOL_GPL(find_iova);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) * __free_iova - frees the given iova
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) * @iovad: iova domain in question.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) * @iova: iova in question.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) * Frees the given iova belonging to the giving domain
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) __free_iova(struct iova_domain *iovad, struct iova *iova)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) {
^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) spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) private_free_iova(iovad, iova);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) EXPORT_SYMBOL_GPL(__free_iova);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) * free_iova - finds and frees the iova for a given pfn
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) * @iovad: - iova domain in question.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) * @pfn: - pfn that is allocated previously
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) * This functions finds an iova for a given pfn and then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) * frees the iova from that domain.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) free_iova(struct iova_domain *iovad, unsigned long pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) struct iova *iova = find_iova(iovad, pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) if (iova)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) __free_iova(iovad, iova);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) EXPORT_SYMBOL_GPL(free_iova);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) * alloc_iova_fast - allocates an iova from rcache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) * @iovad: - iova domain in question
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) * @size: - size of page frames to allocate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) * @limit_pfn: - max limit address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) * @flush_rcache: - set to flush rcache on regular allocation failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) * This function tries to satisfy an iova allocation from the rcache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) * and falls back to regular allocation on failure. If regular allocation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) * fails too and the flush_rcache flag is set then the rcache will be flushed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) unsigned long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) alloc_iova_fast(struct iova_domain *iovad, unsigned long size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) unsigned long limit_pfn, bool flush_rcache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) unsigned long iova_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) struct iova *new_iova;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) iova_pfn = iova_rcache_get(iovad, size, limit_pfn + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) if (iova_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) return iova_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) new_iova = alloc_iova(iovad, size, limit_pfn, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) if (!new_iova) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) unsigned int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) if (!flush_rcache) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) iova_dump(iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) /* Try replenishing IOVAs by flushing rcache. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) flush_rcache = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) for_each_online_cpu(cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) free_cpu_cached_iovas(cpu, iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) free_global_cached_iovas(iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) return new_iova->pfn_lo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) EXPORT_SYMBOL_GPL(alloc_iova_fast);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) * free_iova_fast - free iova pfn range into rcache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) * @iovad: - iova domain in question.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) * @pfn: - pfn that is allocated previously
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) * @size: - # of pages in range
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) * This functions frees an iova range by trying to put it into the rcache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) * falling back to regular iova deallocation via free_iova() if this fails.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) free_iova_fast(struct iova_domain *iovad, unsigned long pfn, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) if (iova_rcache_insert(iovad, pfn, size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) free_iova(iovad, pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) EXPORT_SYMBOL_GPL(free_iova_fast);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) #define fq_ring_for_each(i, fq) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) for ((i) = (fq)->head; (i) != (fq)->tail; (i) = ((i) + 1) % IOVA_FQ_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) static inline bool fq_full(struct iova_fq *fq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) assert_spin_locked(&fq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) return (((fq->tail + 1) % IOVA_FQ_SIZE) == fq->head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) static inline unsigned fq_ring_add(struct iova_fq *fq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) unsigned idx = fq->tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) assert_spin_locked(&fq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) fq->tail = (idx + 1) % IOVA_FQ_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) return idx;
^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) static void fq_ring_free(struct iova_domain *iovad, struct iova_fq *fq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) u64 counter = atomic64_read(&iovad->fq_flush_finish_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) unsigned idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) assert_spin_locked(&fq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) fq_ring_for_each(idx, fq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) if (fq->entries[idx].counter >= counter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) if (iovad->entry_dtor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) iovad->entry_dtor(fq->entries[idx].data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) free_iova_fast(iovad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) fq->entries[idx].iova_pfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) fq->entries[idx].pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) fq->head = (fq->head + 1) % IOVA_FQ_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) static void iova_domain_flush(struct iova_domain *iovad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) atomic64_inc(&iovad->fq_flush_start_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) iovad->flush_cb(iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) atomic64_inc(&iovad->fq_flush_finish_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) static void fq_destroy_all_entries(struct iova_domain *iovad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) * This code runs when the iova_domain is being detroyed, so don't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) * bother to free iovas, just call the entry_dtor on all remaining
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) * entries.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) if (!iovad->entry_dtor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) struct iova_fq *fq = per_cpu_ptr(iovad->fq, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) fq_ring_for_each(idx, fq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) iovad->entry_dtor(fq->entries[idx].data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) static void fq_flush_timeout(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) struct iova_domain *iovad = from_timer(iovad, t, fq_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) atomic_set(&iovad->fq_timer_on, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) iova_domain_flush(iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) struct iova_fq *fq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) fq = per_cpu_ptr(iovad->fq, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) spin_lock_irqsave(&fq->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) fq_ring_free(iovad, fq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) spin_unlock_irqrestore(&fq->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) void queue_iova(struct iova_domain *iovad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) unsigned long pfn, unsigned long pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) unsigned long data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) struct iova_fq *fq = raw_cpu_ptr(iovad->fq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) unsigned idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) spin_lock_irqsave(&fq->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) * First remove all entries from the flush queue that have already been
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) * flushed out on another CPU. This makes the fq_full() check below less
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) * likely to be true.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) fq_ring_free(iovad, fq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) if (fq_full(fq)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) iova_domain_flush(iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) fq_ring_free(iovad, fq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) idx = fq_ring_add(fq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) fq->entries[idx].iova_pfn = pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) fq->entries[idx].pages = pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) fq->entries[idx].data = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) fq->entries[idx].counter = atomic64_read(&iovad->fq_flush_start_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) spin_unlock_irqrestore(&fq->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) /* Avoid false sharing as much as possible. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) if (!atomic_read(&iovad->fq_timer_on) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) !atomic_xchg(&iovad->fq_timer_on, 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) mod_timer(&iovad->fq_timer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) jiffies + msecs_to_jiffies(IOVA_FQ_TIMEOUT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) EXPORT_SYMBOL_GPL(queue_iova);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) * put_iova_domain - destroys the iova doamin
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) * @iovad: - iova domain in question.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) * All the iova's in that domain are destroyed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) void put_iova_domain(struct iova_domain *iovad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) struct iova *iova, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) free_iova_flush_queue(iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) free_iova_rcaches(iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) rbtree_postorder_for_each_entry_safe(iova, tmp, &iovad->rbroot, node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) free_iova_mem(iova);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) EXPORT_SYMBOL_GPL(put_iova_domain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) __is_range_overlap(struct rb_node *node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) unsigned long pfn_lo, unsigned long pfn_hi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) struct iova *iova = rb_entry(node, struct iova, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) if ((pfn_lo <= iova->pfn_hi) && (pfn_hi >= iova->pfn_lo))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) static inline struct iova *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) alloc_and_init_iova(unsigned long pfn_lo, unsigned long pfn_hi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) struct iova *iova;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) iova = alloc_iova_mem();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) if (iova) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) iova->pfn_lo = pfn_lo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) iova->pfn_hi = pfn_hi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) return iova;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) static struct iova *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) __insert_new_range(struct iova_domain *iovad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) unsigned long pfn_lo, unsigned long pfn_hi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) struct iova *iova;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) iova = alloc_and_init_iova(pfn_lo, pfn_hi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) if (iova)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) iova_insert_rbtree(&iovad->rbroot, iova, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) return iova;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) __adjust_overlap_range(struct iova *iova,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) unsigned long *pfn_lo, unsigned long *pfn_hi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) if (*pfn_lo < iova->pfn_lo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) iova->pfn_lo = *pfn_lo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) if (*pfn_hi > iova->pfn_hi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) *pfn_lo = iova->pfn_hi + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) * reserve_iova - reserves an iova in the given range
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) * @iovad: - iova domain pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) * @pfn_lo: - lower page frame address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) * @pfn_hi:- higher pfn adderss
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) * This function allocates reserves the address range from pfn_lo to pfn_hi so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) * that this address is not dished out as part of alloc_iova.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) struct iova *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) reserve_iova(struct iova_domain *iovad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) unsigned long pfn_lo, unsigned long pfn_hi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) struct rb_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) struct iova *iova;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) unsigned int overlap = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) /* Don't allow nonsensical pfns */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) if (WARN_ON((pfn_hi | pfn_lo) > (ULLONG_MAX >> iova_shift(iovad))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) for (node = rb_first(&iovad->rbroot); node; node = rb_next(node)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) if (__is_range_overlap(node, pfn_lo, pfn_hi)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) iova = rb_entry(node, struct iova, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) __adjust_overlap_range(iova, &pfn_lo, &pfn_hi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) if ((pfn_lo >= iova->pfn_lo) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) (pfn_hi <= iova->pfn_hi))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) goto finish;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) overlap = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) } else if (overlap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) /* We are here either because this is the first reserver node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) * or need to insert remaining non overlap addr range
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) iova = __insert_new_range(iovad, pfn_lo, pfn_hi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) finish:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) return iova;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) EXPORT_SYMBOL_GPL(reserve_iova);
^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) * copy_reserved_iova - copies the reserved between domains
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) * @from: - source doamin from where to copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) * @to: - destination domin where to copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) * This function copies reserved iova's from one doamin to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) * other.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) copy_reserved_iova(struct iova_domain *from, struct iova_domain *to)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) struct rb_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) spin_lock_irqsave(&from->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) for (node = rb_first(&from->rbroot); node; node = rb_next(node)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) struct iova *iova = rb_entry(node, struct iova, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) struct iova *new_iova;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) if (iova->pfn_lo == IOVA_ANCHOR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) new_iova = reserve_iova(to, iova->pfn_lo, iova->pfn_hi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) if (!new_iova)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) pr_err("Reserve iova range %lx@%lx failed\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) iova->pfn_lo, iova->pfn_lo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) spin_unlock_irqrestore(&from->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) EXPORT_SYMBOL_GPL(copy_reserved_iova);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) struct iova *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) split_and_remove_iova(struct iova_domain *iovad, struct iova *iova,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) unsigned long pfn_lo, unsigned long pfn_hi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) struct iova *prev = NULL, *next = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) if (iova->pfn_lo < pfn_lo) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) prev = alloc_and_init_iova(iova->pfn_lo, pfn_lo - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) if (prev == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) if (iova->pfn_hi > pfn_hi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) next = alloc_and_init_iova(pfn_hi + 1, iova->pfn_hi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) if (next == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) __cached_rbnode_delete_update(iovad, iova);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) rb_erase(&iova->node, &iovad->rbroot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) if (prev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) iova_insert_rbtree(&iovad->rbroot, prev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) iova->pfn_lo = pfn_lo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) if (next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) iova_insert_rbtree(&iovad->rbroot, next, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) iova->pfn_hi = pfn_hi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) return iova;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) if (prev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) free_iova_mem(prev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) * Magazine caches for IOVA ranges. For an introduction to magazines,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) * see the USENIX 2001 paper "Magazines and Vmem: Extending the Slab
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) * Allocator to Many CPUs and Arbitrary Resources" by Bonwick and Adams.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) * For simplicity, we use a static magazine size and don't implement the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) * dynamic size tuning described in the paper.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) #define IOVA_MAG_SIZE 128
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) struct iova_magazine {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) unsigned long size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) unsigned long pfns[IOVA_MAG_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) struct iova_cpu_rcache {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) struct iova_magazine *loaded;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) struct iova_magazine *prev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) static void iova_dump(struct iova_domain *iovad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) struct iova *iova, *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) unsigned long used_pfn = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) int i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) rbtree_postorder_for_each_entry_safe(iova, t, &iovad->rbroot, node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) dma_addr_t start = iova->pfn_lo << iova_shift(iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) dma_addr_t end = iova->pfn_hi << iova_shift(iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) unsigned long pfn = iova->pfn_hi + 1 - iova->pfn_lo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) if (iova->pfn_lo == IOVA_ANCHOR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) pr_info("%4d: [%pad..%pad] (%4lu - %4lu)MiB\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) i++, &start, &end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) iova->pfn_lo >> (20 - PAGE_SHIFT),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) iova->pfn_hi >> (20 - PAGE_SHIFT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) used_pfn += pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) pr_info("used: %lu MiB\n", used_pfn >> (20 - PAGE_SHIFT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) static struct iova_magazine *iova_magazine_alloc(gfp_t flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) return kzalloc(sizeof(struct iova_magazine), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) static void iova_magazine_free(struct iova_magazine *mag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) kfree(mag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) iova_magazine_free_pfns(struct iova_magazine *mag, struct iova_domain *iovad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) if (!mag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) for (i = 0 ; i < mag->size; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) struct iova *iova = private_find_iova(iovad, mag->pfns[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) if (WARN_ON(!iova))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) private_free_iova(iovad, iova);
^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) spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) mag->size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) static bool iova_magazine_full(struct iova_magazine *mag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) return (mag && mag->size == IOVA_MAG_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) static bool iova_magazine_empty(struct iova_magazine *mag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) return (!mag || mag->size == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) static unsigned long iova_magazine_pop(struct iova_magazine *mag,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) unsigned long limit_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) unsigned long pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) BUG_ON(iova_magazine_empty(mag));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) /* Only fall back to the rbtree if we have no suitable pfns at all */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) for (i = mag->size - 1; mag->pfns[i] > limit_pfn; i--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) if (i == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) /* Swap it to pop it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) pfn = mag->pfns[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) mag->pfns[i] = mag->pfns[--mag->size];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) return pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) static void iova_magazine_push(struct iova_magazine *mag, unsigned long pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) BUG_ON(iova_magazine_full(mag));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) mag->pfns[mag->size++] = pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) static void init_iova_rcaches(struct iova_domain *iovad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) struct iova_cpu_rcache *cpu_rcache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) struct iova_rcache *rcache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) unsigned int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) for (i = 0; i < IOVA_RANGE_CACHE_MAX_SIZE; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) rcache = &iovad->rcaches[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) spin_lock_init(&rcache->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) rcache->depot_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) rcache->cpu_rcaches = __alloc_percpu(sizeof(*cpu_rcache), cache_line_size());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) if (WARN_ON(!rcache->cpu_rcaches))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) cpu_rcache = per_cpu_ptr(rcache->cpu_rcaches, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) spin_lock_init(&cpu_rcache->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) cpu_rcache->loaded = iova_magazine_alloc(GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) cpu_rcache->prev = iova_magazine_alloc(GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) * Try inserting IOVA range starting with 'iova_pfn' into 'rcache', and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) * return true on success. Can fail if rcache is full and we can't free
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) * space, and free_iova() (our only caller) will then return the IOVA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) * range to the rbtree instead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) static bool __iova_rcache_insert(struct iova_domain *iovad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) struct iova_rcache *rcache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) unsigned long iova_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) struct iova_magazine *mag_to_free = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) struct iova_cpu_rcache *cpu_rcache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) bool can_insert = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) cpu_rcache = raw_cpu_ptr(rcache->cpu_rcaches);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) spin_lock_irqsave(&cpu_rcache->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) if (!iova_magazine_full(cpu_rcache->loaded)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) can_insert = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) } else if (!iova_magazine_full(cpu_rcache->prev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) swap(cpu_rcache->prev, cpu_rcache->loaded);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) can_insert = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) struct iova_magazine *new_mag = iova_magazine_alloc(GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) if (new_mag) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) spin_lock(&rcache->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) if (rcache->depot_size < MAX_GLOBAL_MAGS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) rcache->depot[rcache->depot_size++] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) cpu_rcache->loaded;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) mag_to_free = cpu_rcache->loaded;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) spin_unlock(&rcache->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) cpu_rcache->loaded = new_mag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) can_insert = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) if (can_insert)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) iova_magazine_push(cpu_rcache->loaded, iova_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) spin_unlock_irqrestore(&cpu_rcache->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) if (mag_to_free) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) iova_magazine_free_pfns(mag_to_free, iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) iova_magazine_free(mag_to_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) return can_insert;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) static bool iova_rcache_insert(struct iova_domain *iovad, unsigned long pfn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) unsigned int log_size = order_base_2(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) if (log_size >= IOVA_RANGE_CACHE_MAX_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) return __iova_rcache_insert(iovad, &iovad->rcaches[log_size], pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) * Caller wants to allocate a new IOVA range from 'rcache'. If we can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) * satisfy the request, return a matching non-NULL range and remove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) * it from the 'rcache'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) static unsigned long __iova_rcache_get(struct iova_rcache *rcache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) unsigned long limit_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) struct iova_cpu_rcache *cpu_rcache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) unsigned long iova_pfn = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) bool has_pfn = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) cpu_rcache = raw_cpu_ptr(rcache->cpu_rcaches);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) spin_lock_irqsave(&cpu_rcache->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) if (!iova_magazine_empty(cpu_rcache->loaded)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) has_pfn = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) } else if (!iova_magazine_empty(cpu_rcache->prev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) swap(cpu_rcache->prev, cpu_rcache->loaded);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) has_pfn = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) spin_lock(&rcache->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) if (rcache->depot_size > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) iova_magazine_free(cpu_rcache->loaded);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) cpu_rcache->loaded = rcache->depot[--rcache->depot_size];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) has_pfn = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) spin_unlock(&rcache->lock);
^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) if (has_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) iova_pfn = iova_magazine_pop(cpu_rcache->loaded, limit_pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) spin_unlock_irqrestore(&cpu_rcache->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) return iova_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) * Try to satisfy IOVA allocation range from rcache. Fail if requested
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) * size is too big or the DMA limit we are given isn't satisfied by the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) * top element in the magazine.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) static unsigned long iova_rcache_get(struct iova_domain *iovad,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) unsigned long size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) unsigned long limit_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) unsigned int log_size = order_base_2(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) if (log_size >= IOVA_RANGE_CACHE_MAX_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) return __iova_rcache_get(&iovad->rcaches[log_size], limit_pfn - size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) * free rcache data structures.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) static void free_iova_rcaches(struct iova_domain *iovad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) struct iova_rcache *rcache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) struct iova_cpu_rcache *cpu_rcache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) unsigned int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) int i, j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) for (i = 0; i < IOVA_RANGE_CACHE_MAX_SIZE; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) rcache = &iovad->rcaches[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) cpu_rcache = per_cpu_ptr(rcache->cpu_rcaches, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) iova_magazine_free(cpu_rcache->loaded);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) iova_magazine_free(cpu_rcache->prev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) free_percpu(rcache->cpu_rcaches);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) for (j = 0; j < rcache->depot_size; ++j)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) iova_magazine_free(rcache->depot[j]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) * free all the IOVA ranges cached by a cpu (used when cpu is unplugged)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) struct iova_cpu_rcache *cpu_rcache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) struct iova_rcache *rcache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) for (i = 0; i < IOVA_RANGE_CACHE_MAX_SIZE; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) rcache = &iovad->rcaches[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) cpu_rcache = per_cpu_ptr(rcache->cpu_rcaches, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) spin_lock_irqsave(&cpu_rcache->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) iova_magazine_free_pfns(cpu_rcache->loaded, iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) iova_magazine_free_pfns(cpu_rcache->prev, iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) spin_unlock_irqrestore(&cpu_rcache->lock, flags);
^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)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) * free all the IOVA ranges of global cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) void free_global_cached_iovas(struct iova_domain *iovad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) struct iova_rcache *rcache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) int i, j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) for (i = 0; i < IOVA_RANGE_CACHE_MAX_SIZE; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) rcache = &iovad->rcaches[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) spin_lock_irqsave(&rcache->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) for (j = 0; j < rcache->depot_size; ++j) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) iova_magazine_free_pfns(rcache->depot[j], iovad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) iova_magazine_free(rcache->depot[j]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) rcache->depot[j] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) rcache->depot_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) spin_unlock_irqrestore(&rcache->lock, flags);
^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)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) MODULE_AUTHOR("Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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