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Diffstat (limited to 'fs/pstore/ram.c')
-rw-r--r--fs/pstore/ram.c105
1 files changed, 71 insertions, 34 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 7003e5266f2..3b5744306ed 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -83,9 +83,10 @@ struct ramoops_context {
size_t console_size;
size_t ftrace_size;
int dump_oops;
- int ecc_size;
+ struct persistent_ram_ecc_info ecc_info;
unsigned int max_dump_cnt;
unsigned int dump_write_cnt;
+ /* _read_cnt need clear on ramoops_pstore_open */
unsigned int dump_read_cnt;
unsigned int console_read_cnt;
unsigned int ftrace_read_cnt;
@@ -101,6 +102,7 @@ static int ramoops_pstore_open(struct pstore_info *psi)
cxt->dump_read_cnt = 0;
cxt->console_read_cnt = 0;
+ cxt->ftrace_read_cnt = 0;
return 0;
}
@@ -117,13 +119,15 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
return NULL;
prz = przs[i];
+ if (!prz)
+ return NULL;
- if (update) {
- /* Update old/shadowed buffer. */
+ /* Update old/shadowed buffer. */
+ if (update)
persistent_ram_save_old(prz);
- if (!persistent_ram_old_size(prz))
- return NULL;
- }
+
+ if (!persistent_ram_old_size(prz))
+ return NULL;
*typep = type;
*id = i;
@@ -131,11 +135,34 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
return prz;
}
+static void ramoops_read_kmsg_hdr(char *buffer, struct timespec *time,
+ bool *compressed)
+{
+ char data_type;
+
+ if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
+ &time->tv_sec, &time->tv_nsec, &data_type) == 3) {
+ if (data_type == 'C')
+ *compressed = true;
+ else
+ *compressed = false;
+ } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n",
+ &time->tv_sec, &time->tv_nsec) == 2) {
+ *compressed = false;
+ } else {
+ time->tv_sec = 0;
+ time->tv_nsec = 0;
+ *compressed = false;
+ }
+}
+
static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
int *count, struct timespec *time,
- char **buf, struct pstore_info *psi)
+ char **buf, bool *compressed,
+ struct pstore_info *psi)
{
ssize_t size;
+ ssize_t ecc_notice_size;
struct ramoops_context *cxt = psi->data;
struct persistent_ram_zone *prz;
@@ -151,28 +178,37 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
if (!prz)
return 0;
- /* TODO(kees): Bogus time for the moment. */
- time->tv_sec = 0;
- time->tv_nsec = 0;
-
size = persistent_ram_old_size(prz);
- *buf = kmalloc(size, GFP_KERNEL);
+
+ /* ECC correction notice */
+ ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
+
+ *buf = kmalloc(size + ecc_notice_size + 1, GFP_KERNEL);
if (*buf == NULL)
return -ENOMEM;
+
memcpy(*buf, persistent_ram_old(prz), size);
+ ramoops_read_kmsg_hdr(*buf, time, compressed);
+ persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1);
- return size;
+ return size + ecc_notice_size;
}
-static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz)
+static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
+ bool compressed)
{
char *hdr;
- struct timeval timestamp;
+ struct timespec timestamp;
size_t len;
- do_gettimeofday(&timestamp);
- hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu\n",
- (long)timestamp.tv_sec, (long)timestamp.tv_usec);
+ /* Report zeroed timestamp if called before timekeeping has resumed. */
+ if (__getnstimeofday(&timestamp)) {
+ timestamp.tv_sec = 0;
+ timestamp.tv_nsec = 0;
+ }
+ hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
+ (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000),
+ compressed ? 'C' : 'D');
WARN_ON_ONCE(!hdr);
len = hdr ? strlen(hdr) : 0;
persistent_ram_write(prz, hdr, len);
@@ -184,7 +220,8 @@ static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz)
static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
enum kmsg_dump_reason reason,
u64 *id, unsigned int part,
- const char *buf, size_t size,
+ const char *buf,
+ bool compressed, size_t size,
struct pstore_info *psi)
{
struct ramoops_context *cxt = psi->data;
@@ -230,7 +267,7 @@ static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
prz = cxt->przs[cxt->dump_write_cnt];
- hlen = ramoops_write_kmsg_hdr(prz);
+ hlen = ramoops_write_kmsg_hdr(prz, compressed);
if (size + hlen > prz->buffer_size)
size = prz->buffer_size - hlen;
persistent_ram_write(prz, buf, size);
@@ -283,6 +320,7 @@ static void ramoops_free_przs(struct ramoops_context *cxt)
{
int i;
+ cxt->max_dump_cnt = 0;
if (!cxt->przs)
return;
@@ -313,13 +351,14 @@ static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
GFP_KERNEL);
if (!cxt->przs) {
dev_err(dev, "failed to initialize a prz array for dumps\n");
- return -ENOMEM;
+ goto fail_prz;
}
for (i = 0; i < cxt->max_dump_cnt; i++) {
size_t sz = cxt->record_size;
- cxt->przs[i] = persistent_ram_new(*paddr, sz, 0, cxt->ecc_size);
+ cxt->przs[i] = persistent_ram_new(*paddr, sz, 0,
+ &cxt->ecc_info);
if (IS_ERR(cxt->przs[i])) {
err = PTR_ERR(cxt->przs[i]);
dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
@@ -349,7 +388,7 @@ static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt,
return -ENOMEM;
}
- *prz = persistent_ram_new(*paddr, sz, sig, cxt->ecc_size);
+ *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info);
if (IS_ERR(*prz)) {
int err = PTR_ERR(*prz);
@@ -387,23 +426,20 @@ static int ramoops_probe(struct platform_device *pdev)
goto fail_out;
}
- if (!is_power_of_2(pdata->mem_size))
- pdata->mem_size = rounddown_pow_of_two(pdata->mem_size);
- if (!is_power_of_2(pdata->record_size))
+ if (pdata->record_size && !is_power_of_2(pdata->record_size))
pdata->record_size = rounddown_pow_of_two(pdata->record_size);
- if (!is_power_of_2(pdata->console_size))
+ if (pdata->console_size && !is_power_of_2(pdata->console_size))
pdata->console_size = rounddown_pow_of_two(pdata->console_size);
- if (!is_power_of_2(pdata->ftrace_size))
+ if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
- cxt->dump_read_cnt = 0;
cxt->size = pdata->mem_size;
cxt->phys_addr = pdata->mem_address;
cxt->record_size = pdata->record_size;
cxt->console_size = pdata->console_size;
cxt->ftrace_size = pdata->ftrace_size;
cxt->dump_oops = pdata->dump_oops;
- cxt->ecc_size = pdata->ecc_size;
+ cxt->ecc_info = pdata->ecc_info;
paddr = cxt->phys_addr;
@@ -426,6 +462,7 @@ static int ramoops_probe(struct platform_device *pdev)
pr_err("memory size too small, minimum is %zu\n",
cxt->console_size + cxt->record_size +
cxt->ftrace_size);
+ err = -EINVAL;
goto fail_cnt;
}
@@ -443,6 +480,7 @@ static int ramoops_probe(struct platform_device *pdev)
spin_lock_init(&cxt->pstore.buf_lock);
if (!cxt->pstore.buf) {
pr_err("cannot allocate pstore buffer\n");
+ err = -ENOMEM;
goto fail_clear;
}
@@ -461,9 +499,9 @@ static int ramoops_probe(struct platform_device *pdev)
record_size = pdata->record_size;
dump_oops = pdata->dump_oops;
- pr_info("attached 0x%lx@0x%llx, ecc: %d\n",
+ pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
cxt->size, (unsigned long long)cxt->phys_addr,
- cxt->ecc_size);
+ cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
return 0;
@@ -471,7 +509,6 @@ fail_buf:
kfree(cxt->pstore.buf);
fail_clear:
cxt->pstore.bufsize = 0;
- cxt->max_dump_cnt = 0;
fail_cnt:
kfree(cxt->fprz);
fail_init_fprz:
@@ -535,7 +572,7 @@ static void ramoops_register_dummy(void)
* For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
* (using 1 byte for ECC isn't much of use anyway).
*/
- dummy_data->ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
+ dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
dummy = platform_device_register_data(NULL, "ramoops", -1,
dummy_data, sizeof(struct ramoops_platform_data));
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 14:12:53 +0000