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Diffstat (limited to 'arch/powerpc/platforms/pseries/nvram.c')
-rw-r--r--arch/powerpc/platforms/pseries/nvram.c162
1 files changed, 40 insertions, 122 deletions
diff --git a/arch/powerpc/platforms/pseries/nvram.c b/arch/powerpc/platforms/pseries/nvram.c
index 9f8671a4455..d276cd3edd8 100644
--- a/arch/powerpc/platforms/pseries/nvram.c
+++ b/arch/powerpc/platforms/pseries/nvram.c
@@ -539,65 +539,6 @@ static int zip_oops(size_t text_len)
}
#ifdef CONFIG_PSTORE
-/* Derived from logfs_uncompress */
-int nvram_decompress(void *in, void *out, size_t inlen, size_t outlen)
-{
- int err, ret;
-
- ret = -EIO;
- err = zlib_inflateInit(&stream);
- if (err != Z_OK)
- goto error;
-
- stream.next_in = in;
- stream.avail_in = inlen;
- stream.total_in = 0;
- stream.next_out = out;
- stream.avail_out = outlen;
- stream.total_out = 0;
-
- err = zlib_inflate(&stream, Z_FINISH);
- if (err != Z_STREAM_END)
- goto error;
-
- err = zlib_inflateEnd(&stream);
- if (err != Z_OK)
- goto error;
-
- ret = stream.total_out;
-error:
- return ret;
-}
-
-static int unzip_oops(char *oops_buf, char *big_buf)
-{
- struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf;
- u64 timestamp = oops_hdr->timestamp;
- char *big_oops_data = NULL;
- char *oops_data_buf = NULL;
- size_t big_oops_data_sz;
- int unzipped_len;
-
- big_oops_data = big_buf + sizeof(struct oops_log_info);
- big_oops_data_sz = big_oops_buf_sz - sizeof(struct oops_log_info);
- oops_data_buf = oops_buf + sizeof(struct oops_log_info);
-
- unzipped_len = nvram_decompress(oops_data_buf, big_oops_data,
- oops_hdr->report_length,
- big_oops_data_sz);
-
- if (unzipped_len < 0) {
- pr_err("nvram: decompression failed; returned %d\n",
- unzipped_len);
- return -1;
- }
- oops_hdr = (struct oops_log_info *)big_buf;
- oops_hdr->version = OOPS_HDR_VERSION;
- oops_hdr->report_length = (u16) unzipped_len;
- oops_hdr->timestamp = timestamp;
- return 0;
-}
-
static int nvram_pstore_open(struct pstore_info *psi)
{
/* Reset the iterator to start reading partitions again */
@@ -613,7 +554,7 @@ static int nvram_pstore_open(struct pstore_info *psi)
* @part: pstore writes data to registered buffer in parts,
* part number will indicate the same.
* @count: Indicates oops count
- * @hsize: Size of header added by pstore
+ * @compressed: Flag to indicate the log is compressed
* @size: number of bytes written to the registered buffer
* @psi: registered pstore_info structure
*
@@ -624,7 +565,7 @@ static int nvram_pstore_open(struct pstore_info *psi)
static int nvram_pstore_write(enum pstore_type_id type,
enum kmsg_dump_reason reason,
u64 *id, unsigned int part, int count,
- size_t hsize, size_t size,
+ bool compressed, size_t size,
struct pstore_info *psi)
{
int rc;
@@ -640,30 +581,11 @@ static int nvram_pstore_write(enum pstore_type_id type,
oops_hdr->report_length = (u16) size;
oops_hdr->timestamp = get_seconds();
- if (big_oops_buf) {
- rc = zip_oops(size);
- /*
- * If compression fails copy recent log messages from
- * big_oops_buf to oops_data.
- */
- if (rc != 0) {
- size_t diff = size - oops_data_sz + hsize;
-
- if (size > oops_data_sz) {
- memcpy(oops_data, big_oops_buf, hsize);
- memcpy(oops_data + hsize, big_oops_buf + diff,
- oops_data_sz - hsize);
-
- oops_hdr->report_length = (u16) oops_data_sz;
- } else
- memcpy(oops_data, big_oops_buf, size);
- } else
- err_type = ERR_TYPE_KERNEL_PANIC_GZ;
- }
+ if (compressed)
+ err_type = ERR_TYPE_KERNEL_PANIC_GZ;
rc = nvram_write_os_partition(&oops_log_partition, oops_buf,
- (int) (sizeof(*oops_hdr) + oops_hdr->report_length), err_type,
- count);
+ (int) (sizeof(*oops_hdr) + size), err_type, count);
if (rc != 0)
return rc;
@@ -679,16 +601,15 @@ static int nvram_pstore_write(enum pstore_type_id type,
*/
static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type,
int *count, struct timespec *time, char **buf,
- struct pstore_info *psi)
+ bool *compressed, struct pstore_info *psi)
{
struct oops_log_info *oops_hdr;
unsigned int err_type, id_no, size = 0;
struct nvram_os_partition *part = NULL;
- char *buff = NULL, *big_buff = NULL;
- int rc, sig = 0;
+ char *buff = NULL;
+ int sig = 0;
loff_t p;
-read_partition:
read_type++;
switch (nvram_type_ids[read_type]) {
@@ -749,30 +670,32 @@ read_partition:
*id = id_no;
if (nvram_type_ids[read_type] == PSTORE_TYPE_DMESG) {
- oops_hdr = (struct oops_log_info *)buff;
- *buf = buff + sizeof(*oops_hdr);
-
- if (err_type == ERR_TYPE_KERNEL_PANIC_GZ) {
- big_buff = kmalloc(big_oops_buf_sz, GFP_KERNEL);
- if (!big_buff)
- return -ENOMEM;
-
- rc = unzip_oops(buff, big_buff);
+ size_t length, hdr_size;
- if (rc != 0) {
- kfree(buff);
- kfree(big_buff);
- goto read_partition;
- }
-
- oops_hdr = (struct oops_log_info *)big_buff;
- *buf = big_buff + sizeof(*oops_hdr);
- kfree(buff);
+ oops_hdr = (struct oops_log_info *)buff;
+ if (oops_hdr->version < OOPS_HDR_VERSION) {
+ /* Old format oops header had 2-byte record size */
+ hdr_size = sizeof(u16);
+ length = oops_hdr->version;
+ time->tv_sec = 0;
+ time->tv_nsec = 0;
+ } else {
+ hdr_size = sizeof(*oops_hdr);
+ length = oops_hdr->report_length;
+ time->tv_sec = oops_hdr->timestamp;
+ time->tv_nsec = 0;
}
+ *buf = kmalloc(length, GFP_KERNEL);
+ if (*buf == NULL)
+ return -ENOMEM;
+ memcpy(*buf, buff + hdr_size, length);
+ kfree(buff);
- time->tv_sec = oops_hdr->timestamp;
- time->tv_nsec = 0;
- return oops_hdr->report_length;
+ if (err_type == ERR_TYPE_KERNEL_PANIC_GZ)
+ *compressed = true;
+ else
+ *compressed = false;
+ return length;
}
*buf = buff;
@@ -791,13 +714,8 @@ static int nvram_pstore_init(void)
{
int rc = 0;
- if (big_oops_buf) {
- nvram_pstore_info.buf = big_oops_buf;
- nvram_pstore_info.bufsize = big_oops_buf_sz;
- } else {
- nvram_pstore_info.buf = oops_data;
- nvram_pstore_info.bufsize = oops_data_sz;
- }
+ nvram_pstore_info.buf = oops_data;
+ nvram_pstore_info.bufsize = oops_data_sz;
rc = pstore_register(&nvram_pstore_info);
if (rc != 0)
@@ -836,6 +754,11 @@ static void __init nvram_init_oops_partition(int rtas_partition_exists)
oops_data = oops_buf + sizeof(struct oops_log_info);
oops_data_sz = oops_log_partition.size - sizeof(struct oops_log_info);
+ rc = nvram_pstore_init();
+
+ if (!rc)
+ return;
+
/*
* Figure compression (preceded by elimination of each line's <n>
* severity prefix) will reduce the oops/panic report to at most
@@ -844,8 +767,8 @@ static void __init nvram_init_oops_partition(int rtas_partition_exists)
big_oops_buf_sz = (oops_data_sz * 100) / 45;
big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
if (big_oops_buf) {
- stream.workspace = kmalloc(zlib_deflate_workspacesize(
- WINDOW_BITS, MEM_LEVEL), GFP_KERNEL);
+ stream.workspace = kmalloc(zlib_deflate_workspacesize(
+ WINDOW_BITS, MEM_LEVEL), GFP_KERNEL);
if (!stream.workspace) {
pr_err("nvram: No memory for compression workspace; "
"skipping compression of %s partition data\n",
@@ -859,11 +782,6 @@ static void __init nvram_init_oops_partition(int rtas_partition_exists)
stream.workspace = NULL;
}
- rc = nvram_pstore_init();
-
- if (!rc)
- return;
-
rc = kmsg_dump_register(&nvram_kmsg_dumper);
if (rc != 0) {
pr_err("nvram: kmsg_dump_register() failed; returned %d\n", rc);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-03-02 17:58:05 +0000