^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * c 2001 PPC 64 Team, IBM Corp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * /dev/nvram driver for PPC64
^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/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/nvram.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/kmsg_dump.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/pstore.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/zlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <asm/nvram.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/rtas.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <asm/prom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <asm/machdep.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #undef DEBUG_NVRAM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define NVRAM_HEADER_LEN sizeof(struct nvram_header)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define NVRAM_BLOCK_LEN NVRAM_HEADER_LEN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) /* If change this size, then change the size of NVNAME_LEN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct nvram_header {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) unsigned char signature;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) unsigned char checksum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) unsigned short length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /* Terminating null required only for names < 12 chars. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) char name[12];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct nvram_partition {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct list_head partition;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct nvram_header header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) unsigned int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static LIST_HEAD(nvram_partitions);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #ifdef CONFIG_PPC_PSERIES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct nvram_os_partition rtas_log_partition = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) .name = "ibm,rtas-log",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) .req_size = 2079,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) .min_size = 1055,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) .index = -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) .os_partition = true
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct nvram_os_partition oops_log_partition = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) .name = "lnx,oops-log",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) .req_size = 4000,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) .min_size = 2000,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) .index = -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) .os_partition = true
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static const char *nvram_os_partitions[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #ifdef CONFIG_PPC_PSERIES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) "ibm,rtas-log",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) "lnx,oops-log",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static void oops_to_nvram(struct kmsg_dumper *dumper,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) enum kmsg_dump_reason reason);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static struct kmsg_dumper nvram_kmsg_dumper = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) .dump = oops_to_nvram
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * For capturing and compressing an oops or panic report...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * big_oops_buf[] holds the uncompressed text we're capturing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * oops_buf[] holds the compressed text, preceded by a oops header.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * oops header has u16 holding the version of oops header (to differentiate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * between old and new format header) followed by u16 holding the length of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * the compressed* text (*Or uncompressed, if compression fails.) and u64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * holding the timestamp. oops_buf[] gets written to NVRAM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * oops_log_info points to the header. oops_data points to the compressed text.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * +- oops_buf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * | +- oops_data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * v v
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * +-----------+-----------+-----------+------------------------+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * | version | length | timestamp | text |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * | (2 bytes) | (2 bytes) | (8 bytes) | (oops_data_sz bytes) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * +-----------+-----------+-----------+------------------------+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * ^
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * +- oops_log_info
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * We preallocate these buffers during init to avoid kmalloc during oops/panic.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static size_t big_oops_buf_sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static char *big_oops_buf, *oops_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static char *oops_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static size_t oops_data_sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) /* Compression parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) #define COMPR_LEVEL 6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) #define WINDOW_BITS 12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) #define MEM_LEVEL 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static struct z_stream_s stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) #ifdef CONFIG_PSTORE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) #ifdef CONFIG_PPC_POWERNV
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static struct nvram_os_partition skiboot_partition = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) .name = "ibm,skiboot",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) .index = -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) .os_partition = false
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) #ifdef CONFIG_PPC_PSERIES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static struct nvram_os_partition of_config_partition = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) .name = "of-config",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) .index = -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) .os_partition = false
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) static struct nvram_os_partition common_partition = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) .name = "common",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) .index = -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) .os_partition = false
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static enum pstore_type_id nvram_type_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) PSTORE_TYPE_DMESG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) PSTORE_TYPE_PPC_COMMON,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) -1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) static int read_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /* nvram_write_os_partition
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) * We need to buffer the error logs into nvram to ensure that we have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * the failure information to decode. If we have a severe error there
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) * is no way to guarantee that the OS or the machine is in a state to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) * get back to user land and write the error to disk. For example if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) * the SCSI device driver causes a Machine Check by writing to a bad
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) * IO address, there is no way of guaranteeing that the device driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) * is in any state that is would also be able to write the error data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * captured to disk, thus we buffer it in NVRAM for analysis on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) * next boot.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * In NVRAM the partition containing the error log buffer will looks like:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * Header (in bytes):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * +-----------+----------+--------+------------+------------------+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * | signature | checksum | length | name | data |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) * |0 |1 |2 3|4 15|16 length-1|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * +-----------+----------+--------+------------+------------------+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) * The 'data' section would look like (in bytes):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) * +--------------+------------+-----------------------------------+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) * | event_logged | sequence # | error log |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * |0 3|4 7|8 error_log_size-1|
^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) * event_logged: 0 if event has not been logged to syslog, 1 if it has
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * sequence #: The unique sequence # for each event. (until it wraps)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * error log: The error log from event_scan
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) int nvram_write_os_partition(struct nvram_os_partition *part,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) char *buff, int length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) unsigned int err_type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) unsigned int error_log_cnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) loff_t tmp_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) struct err_log_info info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) if (part->index == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) return -ESPIPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) if (length > part->size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) length = part->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) info.error_type = cpu_to_be32(err_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) info.seq_num = cpu_to_be32(error_log_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) tmp_index = part->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) rc = ppc_md.nvram_write((char *)&info, sizeof(info), &tmp_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) if (rc <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) pr_err("%s: Failed nvram_write (%d)\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) rc = ppc_md.nvram_write(buff, length, &tmp_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (rc <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) pr_err("%s: Failed nvram_write (%d)\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) return rc;
^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) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) /* nvram_read_partition
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) * Reads nvram partition for at most 'length'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) int nvram_read_partition(struct nvram_os_partition *part, char *buff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) int length, unsigned int *err_type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) unsigned int *error_log_cnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) loff_t tmp_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) struct err_log_info info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (part->index == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (length > part->size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) length = part->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) tmp_index = part->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if (part->os_partition) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) rc = ppc_md.nvram_read((char *)&info, sizeof(info), &tmp_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (rc <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) pr_err("%s: Failed nvram_read (%d)\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) return rc;
^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)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) rc = ppc_md.nvram_read(buff, length, &tmp_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) if (rc <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) pr_err("%s: Failed nvram_read (%d)\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (part->os_partition) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) *error_log_cnt = be32_to_cpu(info.seq_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) *err_type = be32_to_cpu(info.error_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) /* nvram_init_os_partition
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) * This sets up a partition with an "OS" signature.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * The general strategy is the following:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) * 1.) If a partition with the indicated name already exists...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) * - If it's large enough, use it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) * - Otherwise, recycle it and keep going.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) * 2.) Search for a free partition that is large enough.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) * 3.) If there's not a free partition large enough, recycle any obsolete
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) * OS partitions and try again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) * 4.) Will first try getting a chunk that will satisfy the requested size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) * 5.) If a chunk of the requested size cannot be allocated, then try finding
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) * a chunk that will satisfy the minum needed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) * Returns 0 on success, else -1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) int __init nvram_init_os_partition(struct nvram_os_partition *part)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) loff_t p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) int size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) /* Look for ours */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) p = nvram_find_partition(part->name, NVRAM_SIG_OS, &size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) /* Found one but too small, remove it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) if (p && size < part->min_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) pr_info("nvram: Found too small %s partition,"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) " removing it...\n", part->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) nvram_remove_partition(part->name, NVRAM_SIG_OS, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) p = 0;
^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) /* Create one if we didn't find */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) if (!p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) p = nvram_create_partition(part->name, NVRAM_SIG_OS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) part->req_size, part->min_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) if (p == -ENOSPC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) pr_info("nvram: No room to create %s partition, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) "deleting any obsolete OS partitions...\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) part->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) nvram_remove_partition(NULL, NVRAM_SIG_OS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) nvram_os_partitions);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) p = nvram_create_partition(part->name, NVRAM_SIG_OS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) part->req_size, part->min_size);
^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)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) if (p <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) pr_err("nvram: Failed to find or create %s"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) " partition, err %d\n", part->name, (int)p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) part->index = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) part->size = nvram_get_partition_size(p) - sizeof(struct err_log_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^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)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) /* Derived from logfs_compress() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) static int nvram_compress(const void *in, void *out, size_t inlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) size_t outlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) int err, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) err = zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) MEM_LEVEL, Z_DEFAULT_STRATEGY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) if (err != Z_OK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) stream.next_in = in;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) stream.avail_in = inlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) stream.total_in = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) stream.next_out = out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) stream.avail_out = outlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) stream.total_out = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) err = zlib_deflate(&stream, Z_FINISH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) if (err != Z_STREAM_END)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) err = zlib_deflateEnd(&stream);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) if (err != Z_OK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) if (stream.total_out >= stream.total_in)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) ret = stream.total_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) /* Compress the text from big_oops_buf into oops_buf. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) static int zip_oops(size_t text_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) int zipped_len = nvram_compress(big_oops_buf, oops_data, text_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) oops_data_sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) if (zipped_len < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) pr_err("nvram: compression failed; returned %d\n", zipped_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) pr_err("nvram: logging uncompressed oops/panic report\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) oops_hdr->report_length = cpu_to_be16(zipped_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) return 0;
^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) #ifdef CONFIG_PSTORE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) static int nvram_pstore_open(struct pstore_info *psi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) /* Reset the iterator to start reading partitions again */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) read_type = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) * nvram_pstore_write - pstore write callback for nvram
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) * @record: pstore record to write, with @id to be set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) * Called by pstore_dump() when an oops or panic report is logged in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) * printk buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) * Returns 0 on successful write.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) static int nvram_pstore_write(struct pstore_record *record)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) unsigned int err_type = ERR_TYPE_KERNEL_PANIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) struct oops_log_info *oops_hdr = (struct oops_log_info *) oops_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) /* part 1 has the recent messages from printk buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if (record->part > 1 || (record->type != PSTORE_TYPE_DMESG))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) if (clobbering_unread_rtas_event())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) oops_hdr->report_length = cpu_to_be16(record->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) if (record->compressed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) err_type = ERR_TYPE_KERNEL_PANIC_GZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) rc = nvram_write_os_partition(&oops_log_partition, oops_buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) (int) (sizeof(*oops_hdr) + record->size), err_type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) record->count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) if (rc != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) record->id = record->part;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) return 0;
^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) * Reads the oops/panic report, rtas, of-config and common partition.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * Returns the length of the data we read from each partition.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * Returns 0 if we've been called before.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) static ssize_t nvram_pstore_read(struct pstore_record *record)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) struct oops_log_info *oops_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) unsigned int err_type, id_no, size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) struct nvram_os_partition *part = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) char *buff = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) int sig = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) loff_t p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) read_type++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) switch (nvram_type_ids[read_type]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) case PSTORE_TYPE_DMESG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) part = &oops_log_partition;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) record->type = PSTORE_TYPE_DMESG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) case PSTORE_TYPE_PPC_COMMON:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) sig = NVRAM_SIG_SYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) part = &common_partition;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) record->type = PSTORE_TYPE_PPC_COMMON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) record->id = PSTORE_TYPE_PPC_COMMON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) record->time.tv_sec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) record->time.tv_nsec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) #ifdef CONFIG_PPC_PSERIES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) case PSTORE_TYPE_PPC_RTAS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) part = &rtas_log_partition;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) record->type = PSTORE_TYPE_PPC_RTAS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) record->time.tv_sec = last_rtas_event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) record->time.tv_nsec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) case PSTORE_TYPE_PPC_OF:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) sig = NVRAM_SIG_OF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) part = &of_config_partition;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) record->type = PSTORE_TYPE_PPC_OF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) record->id = PSTORE_TYPE_PPC_OF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) record->time.tv_sec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) record->time.tv_nsec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) #ifdef CONFIG_PPC_POWERNV
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) case PSTORE_TYPE_PPC_OPAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) sig = NVRAM_SIG_FW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) part = &skiboot_partition;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) record->type = PSTORE_TYPE_PPC_OPAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) record->id = PSTORE_TYPE_PPC_OPAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) record->time.tv_sec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) record->time.tv_nsec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) if (!part->os_partition) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) p = nvram_find_partition(part->name, sig, &size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) if (p <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) pr_err("nvram: Failed to find partition %s, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) "err %d\n", part->name, (int)p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) part->index = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) part->size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) buff = kmalloc(part->size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) if (!buff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) if (nvram_read_partition(part, buff, part->size, &err_type, &id_no)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) kfree(buff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) record->count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) if (part->os_partition)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) record->id = id_no;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) if (nvram_type_ids[read_type] == PSTORE_TYPE_DMESG) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) size_t length, hdr_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) oops_hdr = (struct oops_log_info *)buff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) if (be16_to_cpu(oops_hdr->version) < OOPS_HDR_VERSION) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) /* Old format oops header had 2-byte record size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) hdr_size = sizeof(u16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) length = be16_to_cpu(oops_hdr->version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) record->time.tv_sec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) record->time.tv_nsec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) hdr_size = sizeof(*oops_hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) length = be16_to_cpu(oops_hdr->report_length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) record->time.tv_sec = be64_to_cpu(oops_hdr->timestamp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) record->time.tv_nsec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) record->buf = kmemdup(buff + hdr_size, length, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) kfree(buff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) if (record->buf == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) record->ecc_notice_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) if (err_type == ERR_TYPE_KERNEL_PANIC_GZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) record->compressed = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) record->compressed = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) return length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) record->buf = buff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) return part->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) static struct pstore_info nvram_pstore_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) .name = "nvram",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) .flags = PSTORE_FLAGS_DMESG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) .open = nvram_pstore_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) .read = nvram_pstore_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) .write = nvram_pstore_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) static int nvram_pstore_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) if (machine_is(pseries)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) nvram_type_ids[2] = PSTORE_TYPE_PPC_RTAS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) nvram_type_ids[3] = PSTORE_TYPE_PPC_OF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) nvram_type_ids[2] = PSTORE_TYPE_PPC_OPAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) nvram_pstore_info.buf = oops_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) nvram_pstore_info.bufsize = oops_data_sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) rc = pstore_register(&nvram_pstore_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) if (rc && (rc != -EPERM))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) /* Print error only when pstore.backend == nvram */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) pr_err("nvram: pstore_register() failed, returned %d. "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) "Defaults to kmsg_dump\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) static int nvram_pstore_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) void __init nvram_init_oops_partition(int rtas_partition_exists)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) rc = nvram_init_os_partition(&oops_log_partition);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) if (rc != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) #ifdef CONFIG_PPC_PSERIES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) if (!rtas_partition_exists) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) pr_err("nvram: Failed to initialize oops partition!");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) pr_notice("nvram: Using %s partition to log both"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) " RTAS errors and oops/panic reports\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) rtas_log_partition.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) memcpy(&oops_log_partition, &rtas_log_partition,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) sizeof(rtas_log_partition));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) pr_err("nvram: Failed to initialize oops partition!");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) oops_buf = kmalloc(oops_log_partition.size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) if (!oops_buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) pr_err("nvram: No memory for %s partition\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) oops_log_partition.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) oops_data = oops_buf + sizeof(struct oops_log_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) oops_data_sz = oops_log_partition.size - sizeof(struct oops_log_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) rc = nvram_pstore_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) if (!rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) * Figure compression (preceded by elimination of each line's <n>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) * severity prefix) will reduce the oops/panic report to at most
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) * 45% of its original size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) big_oops_buf_sz = (oops_data_sz * 100) / 45;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) if (big_oops_buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) stream.workspace = kmalloc(zlib_deflate_workspacesize(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) WINDOW_BITS, MEM_LEVEL), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) if (!stream.workspace) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) pr_err("nvram: No memory for compression workspace; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) "skipping compression of %s partition data\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) oops_log_partition.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) kfree(big_oops_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) big_oops_buf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) pr_err("No memory for uncompressed %s data; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) "skipping compression\n", oops_log_partition.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) stream.workspace = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) rc = kmsg_dump_register(&nvram_kmsg_dumper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) if (rc != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) pr_err("nvram: kmsg_dump_register() failed; returned %d\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) kfree(oops_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) kfree(big_oops_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) kfree(stream.workspace);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) * This is our kmsg_dump callback, called after an oops or panic report
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) * has been written to the printk buffer. We want to capture as much
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) * of the printk buffer as possible. First, capture as much as we can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) * that we think will compress sufficiently to fit in the lnx,oops-log
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) * partition. If that's too much, go back and capture uncompressed text.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) static void oops_to_nvram(struct kmsg_dumper *dumper,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) enum kmsg_dump_reason reason)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) static unsigned int oops_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) static bool panicking = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) static DEFINE_SPINLOCK(lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) size_t text_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) unsigned int err_type = ERR_TYPE_KERNEL_PANIC_GZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) int rc = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) switch (reason) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) case KMSG_DUMP_SHUTDOWN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) /* These are almost always orderly shutdowns. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) case KMSG_DUMP_OOPS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) case KMSG_DUMP_PANIC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) panicking = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) case KMSG_DUMP_EMERG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) if (panicking)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) /* Panic report already captured. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) pr_err("%s: ignoring unrecognized KMSG_DUMP_* reason %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) __func__, (int) reason);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) return;
^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) if (clobbering_unread_rtas_event())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) if (!spin_trylock_irqsave(&lock, flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) if (big_oops_buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) kmsg_dump_get_buffer(dumper, false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) big_oops_buf, big_oops_buf_sz, &text_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) rc = zip_oops(text_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) if (rc != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) kmsg_dump_rewind(dumper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) kmsg_dump_get_buffer(dumper, false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) oops_data, oops_data_sz, &text_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) err_type = ERR_TYPE_KERNEL_PANIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) oops_hdr->report_length = cpu_to_be16(text_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) (void) nvram_write_os_partition(&oops_log_partition, oops_buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) (int) (sizeof(*oops_hdr) + text_len), err_type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) ++oops_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) spin_unlock_irqrestore(&lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) #ifdef DEBUG_NVRAM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) static void __init nvram_print_partitions(char * label)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) struct nvram_partition * tmp_part;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) printk(KERN_WARNING "--------%s---------\n", label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) list_for_each_entry(tmp_part, &nvram_partitions, partition) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) printk(KERN_WARNING "%4d \t%02x\t%02x\t%d\t%12.12s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) tmp_part->index, tmp_part->header.signature,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) tmp_part->header.checksum, tmp_part->header.length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) tmp_part->header.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) static int __init nvram_write_header(struct nvram_partition * part)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) loff_t tmp_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) struct nvram_header phead;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) memcpy(&phead, &part->header, NVRAM_HEADER_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) phead.length = cpu_to_be16(phead.length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) tmp_index = part->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) rc = ppc_md.nvram_write((char *)&phead, NVRAM_HEADER_LEN, &tmp_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) static unsigned char __init nvram_checksum(struct nvram_header *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) unsigned int c_sum, c_sum2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) /* The sum may have spilled into the 3rd byte. Fold it back. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) c_sum = ((c_sum & 0xffff) + (c_sum >> 16)) & 0xffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) /* The sum cannot exceed 2 bytes. Fold it into a checksum */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) c_sum2 = (c_sum >> 8) + (c_sum << 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) c_sum = ((c_sum + c_sum2) >> 8) & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) return c_sum;
^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) * Per the criteria passed via nvram_remove_partition(), should this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) * partition be removed? 1=remove, 0=keep
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) static int nvram_can_remove_partition(struct nvram_partition *part,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) const char *name, int sig, const char *exceptions[])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) if (part->header.signature != sig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) if (name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) if (strncmp(name, part->header.name, 12))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) } else if (exceptions) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) const char **except;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) for (except = exceptions; *except; except++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) if (!strncmp(*except, part->header.name, 12))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) * nvram_remove_partition - Remove one or more partitions in nvram
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) * @name: name of the partition to remove, or NULL for a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) * signature only match
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) * @sig: signature of the partition(s) to remove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) * @exceptions: When removing all partitions with a matching signature,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) * leave these alone.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) int __init nvram_remove_partition(const char *name, int sig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) const char *exceptions[])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) struct nvram_partition *part, *prev, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) list_for_each_entry(part, &nvram_partitions, partition) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) if (!nvram_can_remove_partition(part, name, sig, exceptions))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) /* Make partition a free partition */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) part->header.signature = NVRAM_SIG_FREE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) memset(part->header.name, 'w', 12);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) part->header.checksum = nvram_checksum(&part->header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) rc = nvram_write_header(part);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) if (rc <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) /* Merge contiguous ones */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) prev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) list_for_each_entry_safe(part, tmp, &nvram_partitions, partition) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) if (part->header.signature != NVRAM_SIG_FREE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) prev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) if (prev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) prev->header.length += part->header.length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) prev->header.checksum = nvram_checksum(&prev->header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) rc = nvram_write_header(prev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) if (rc <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) list_del(&part->partition);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) kfree(part);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) prev = part;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) }
^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) * nvram_create_partition - Create a partition in nvram
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) * @name: name of the partition to create
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) * @sig: signature of the partition to create
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) * @req_size: size of data to allocate in bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) * @min_size: minimum acceptable size (0 means req_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) * Returns a negative error code or a positive nvram index
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) * of the beginning of the data area of the newly created
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) * partition. If you provided a min_size smaller than req_size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) * you need to query for the actual size yourself after the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) * call using nvram_partition_get_size().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) loff_t __init nvram_create_partition(const char *name, int sig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) int req_size, int min_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) struct nvram_partition *part;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) struct nvram_partition *new_part;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) struct nvram_partition *free_part = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) static char nv_init_vals[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) loff_t tmp_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) long size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) BUILD_BUG_ON(NVRAM_BLOCK_LEN != 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) /* Convert sizes from bytes to blocks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) req_size = ALIGN(req_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) min_size = ALIGN(min_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) /* If no minimum size specified, make it the same as the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) * requested size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) if (min_size == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) min_size = req_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) if (min_size > req_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) /* Now add one block to each for the header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) req_size += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) min_size += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) /* Find a free partition that will give us the maximum needed size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) If can't find one that will give us the minimum size needed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) list_for_each_entry(part, &nvram_partitions, partition) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) if (part->header.signature != NVRAM_SIG_FREE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) if (part->header.length >= req_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) size = req_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) free_part = part;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) if (part->header.length > size &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) part->header.length >= min_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) size = part->header.length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) free_part = part;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) if (!size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) return -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) /* Create our OS partition */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) new_part = kzalloc(sizeof(*new_part), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) if (!new_part) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) pr_err("%s: kmalloc failed\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) new_part->index = free_part->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) new_part->header.signature = sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) new_part->header.length = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) memcpy(new_part->header.name, name, strnlen(name, sizeof(new_part->header.name)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) new_part->header.checksum = nvram_checksum(&new_part->header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) rc = nvram_write_header(new_part);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) if (rc <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) pr_err("%s: nvram_write_header failed (%d)\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) kfree(new_part);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) list_add_tail(&new_part->partition, &free_part->partition);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) /* Adjust or remove the partition we stole the space from */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) if (free_part->header.length > size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) free_part->index += size * NVRAM_BLOCK_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) free_part->header.length -= size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) free_part->header.checksum = nvram_checksum(&free_part->header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) rc = nvram_write_header(free_part);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) if (rc <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) pr_err("%s: nvram_write_header failed (%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) list_del(&free_part->partition);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) kfree(free_part);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) /* Clear the new partition */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) for (tmp_index = new_part->index + NVRAM_HEADER_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) tmp_index < ((size - 1) * NVRAM_BLOCK_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) tmp_index += NVRAM_BLOCK_LEN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) rc = ppc_md.nvram_write(nv_init_vals, NVRAM_BLOCK_LEN, &tmp_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) if (rc <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) pr_err("%s: nvram_write failed (%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) return new_part->index + NVRAM_HEADER_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) }
^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) * nvram_get_partition_size - Get the data size of an nvram partition
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) * @data_index: This is the offset of the start of the data of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) * the partition. The same value that is returned by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) * nvram_create_partition().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) int nvram_get_partition_size(loff_t data_index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) struct nvram_partition *part;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) list_for_each_entry(part, &nvram_partitions, partition) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) if (part->index + NVRAM_HEADER_LEN == data_index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) return (part->header.length - 1) * NVRAM_BLOCK_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) * nvram_find_partition - Find an nvram partition by signature and name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) * @name: Name of the partition or NULL for any name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) * @sig: Signature to test against
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) * @out_size: if non-NULL, returns the size of the data part of the partition
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) loff_t nvram_find_partition(const char *name, int sig, int *out_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) struct nvram_partition *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) list_for_each_entry(p, &nvram_partitions, partition) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) if (p->header.signature == sig &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) (!name || !strncmp(p->header.name, name, 12))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) if (out_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) *out_size = (p->header.length - 1) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) NVRAM_BLOCK_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) return p->index + NVRAM_HEADER_LEN;
^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) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) int __init nvram_scan_partitions(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) loff_t cur_index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) struct nvram_header phead;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) struct nvram_partition * tmp_part;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) unsigned char c_sum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) char * header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) int total_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) total_size = ppc_md.nvram_size();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) header = kmalloc(NVRAM_HEADER_LEN, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) if (!header) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) printk(KERN_ERR "nvram_scan_partitions: Failed kmalloc\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) while (cur_index < total_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) err = ppc_md.nvram_read(header, NVRAM_HEADER_LEN, &cur_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) if (err != NVRAM_HEADER_LEN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) printk(KERN_ERR "nvram_scan_partitions: Error parsing "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) "nvram partitions\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) memcpy(&phead, header, NVRAM_HEADER_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) phead.length = be16_to_cpu(phead.length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) c_sum = nvram_checksum(&phead);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) if (c_sum != phead.checksum) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) printk(KERN_WARNING "WARNING: nvram partition checksum"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) " was %02x, should be %02x!\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) phead.checksum, c_sum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) printk(KERN_WARNING "Terminating nvram partition scan\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) if (!phead.length) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) printk(KERN_WARNING "WARNING: nvram corruption "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) "detected: 0-length partition\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) tmp_part = kmalloc(sizeof(*tmp_part), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) if (!tmp_part) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) tmp_part->index = cur_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) list_add_tail(&tmp_part->partition, &nvram_partitions);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) cur_index += phead.length * NVRAM_BLOCK_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) #ifdef DEBUG_NVRAM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) nvram_print_partitions("NVRAM Partitions");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) kfree(header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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