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Diffstat (limited to 'arch/powerpc/platforms/pseries/nvram.c')
-rw-r--r--arch/powerpc/platforms/pseries/nvram.c554
1 files changed, 453 insertions, 101 deletions
diff --git a/arch/powerpc/platforms/pseries/nvram.c b/arch/powerpc/platforms/pseries/nvram.c
index 8733a86ad52e..9f8671a44551 100644
--- a/arch/powerpc/platforms/pseries/nvram.c
+++ b/arch/powerpc/platforms/pseries/nvram.c
@@ -18,6 +18,7 @@
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/kmsg_dump.h>
+#include <linux/pstore.h>
#include <linux/ctype.h>
#include <linux/zlib.h>
#include <asm/uaccess.h>
@@ -29,6 +30,13 @@
/* Max bytes to read/write in one go */
#define NVRW_CNT 0x20
+/*
+ * Set oops header version to distingush between old and new format header.
+ * lnx,oops-log partition max size is 4000, header version > 4000 will
+ * help in identifying new header.
+ */
+#define OOPS_HDR_VERSION 5000
+
static unsigned int nvram_size;
static int nvram_fetch, nvram_store;
static char nvram_buf[NVRW_CNT]; /* assume this is in the first 4GB */
@@ -45,20 +53,23 @@ struct nvram_os_partition {
int min_size; /* minimum acceptable size (0 means req_size) */
long size; /* size of data portion (excluding err_log_info) */
long index; /* offset of data portion of partition */
+ bool os_partition; /* partition initialized by OS, not FW */
};
static struct nvram_os_partition rtas_log_partition = {
.name = "ibm,rtas-log",
.req_size = 2079,
.min_size = 1055,
- .index = -1
+ .index = -1,
+ .os_partition = true
};
static struct nvram_os_partition oops_log_partition = {
.name = "lnx,oops-log",
.req_size = 4000,
.min_size = 2000,
- .index = -1
+ .index = -1,
+ .os_partition = true
};
static const char *pseries_nvram_os_partitions[] = {
@@ -67,6 +78,12 @@ static const char *pseries_nvram_os_partitions[] = {
NULL
};
+struct oops_log_info {
+ u16 version;
+ u16 report_length;
+ u64 timestamp;
+} __attribute__((packed));
+
static void oops_to_nvram(struct kmsg_dumper *dumper,
enum kmsg_dump_reason reason);
@@ -83,28 +100,28 @@ static unsigned long last_unread_rtas_event; /* timestamp */
* big_oops_buf[] holds the uncompressed text we're capturing.
*
- * oops_buf[] holds the compressed text, preceded by a prefix.
- * The prefix is just a u16 holding the length of the compressed* text.
- * (*Or uncompressed, if compression fails.) oops_buf[] gets written
- * to NVRAM.
+ * oops_buf[] holds the compressed text, preceded by a oops header.
+ * oops header has u16 holding the version of oops header (to differentiate
+ * between old and new format header) followed by u16 holding the length of
+ * the compressed* text (*Or uncompressed, if compression fails.) and u64
+ * holding the timestamp. oops_buf[] gets written to NVRAM.
*
- * oops_len points to the prefix. oops_data points to the compressed text.
+ * oops_log_info points to the header. oops_data points to the compressed text.
*
* +- oops_buf
- * | +- oops_data
- * v v
- * +------------+-----------------------------------------------+
- * | length | text |
- * | (2 bytes) | (oops_data_sz bytes) |
- * +------------+-----------------------------------------------+
+ * | +- oops_data
+ * v v
+ * +-----------+-----------+-----------+------------------------+
+ * | version | length | timestamp | text |
+ * | (2 bytes) | (2 bytes) | (8 bytes) | (oops_data_sz bytes) |
+ * +-----------+-----------+-----------+------------------------+
* ^
- * +- oops_len
+ * +- oops_log_info
*
* We preallocate these buffers during init to avoid kmalloc during oops/panic.
*/
static size_t big_oops_buf_sz;
static char *big_oops_buf, *oops_buf;
-static u16 *oops_len;
static char *oops_data;
static size_t oops_data_sz;
@@ -114,6 +131,30 @@ static size_t oops_data_sz;
#define MEM_LEVEL 4
static struct z_stream_s stream;
+#ifdef CONFIG_PSTORE
+static struct nvram_os_partition of_config_partition = {
+ .name = "of-config",
+ .index = -1,
+ .os_partition = false
+};
+
+static struct nvram_os_partition common_partition = {
+ .name = "common",
+ .index = -1,
+ .os_partition = false
+};
+
+static enum pstore_type_id nvram_type_ids[] = {
+ PSTORE_TYPE_DMESG,
+ PSTORE_TYPE_PPC_RTAS,
+ PSTORE_TYPE_PPC_OF,
+ PSTORE_TYPE_PPC_COMMON,
+ -1
+};
+static int read_type;
+static unsigned long last_rtas_event;
+#endif
+
static ssize_t pSeries_nvram_read(char *buf, size_t count, loff_t *index)
{
unsigned int i;
@@ -275,48 +316,72 @@ int nvram_write_error_log(char * buff, int length,
{
int rc = nvram_write_os_partition(&rtas_log_partition, buff, length,
err_type, error_log_cnt);
- if (!rc)
+ if (!rc) {
last_unread_rtas_event = get_seconds();
+#ifdef CONFIG_PSTORE
+ last_rtas_event = get_seconds();
+#endif
+ }
+
return rc;
}
-/* nvram_read_error_log
+/* nvram_read_partition
*
- * Reads nvram for error log for at most 'length'
+ * Reads nvram partition for at most 'length'
*/
-int nvram_read_error_log(char * buff, int length,
- unsigned int * err_type, unsigned int * error_log_cnt)
+int nvram_read_partition(struct nvram_os_partition *part, char *buff,
+ int length, unsigned int *err_type,
+ unsigned int *error_log_cnt)
{
int rc;
loff_t tmp_index;
struct err_log_info info;
- if (rtas_log_partition.index == -1)
+ if (part->index == -1)
return -1;
- if (length > rtas_log_partition.size)
- length = rtas_log_partition.size;
+ if (length > part->size)
+ length = part->size;
- tmp_index = rtas_log_partition.index;
+ tmp_index = part->index;
- rc = ppc_md.nvram_read((char *)&info, sizeof(struct err_log_info), &tmp_index);
- if (rc <= 0) {
- printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc);
- return rc;
+ if (part->os_partition) {
+ rc = ppc_md.nvram_read((char *)&info,
+ sizeof(struct err_log_info),
+ &tmp_index);
+ if (rc <= 0) {
+ pr_err("%s: Failed nvram_read (%d)\n", __FUNCTION__,
+ rc);
+ return rc;
+ }
}
rc = ppc_md.nvram_read(buff, length, &tmp_index);
if (rc <= 0) {
- printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc);
+ pr_err("%s: Failed nvram_read (%d)\n", __FUNCTION__, rc);
return rc;
}
- *error_log_cnt = info.seq_num;
- *err_type = info.error_type;
+ if (part->os_partition) {
+ *error_log_cnt = info.seq_num;
+ *err_type = info.error_type;
+ }
return 0;
}
+/* nvram_read_error_log
+ *
+ * Reads nvram for error log for at most 'length'
+ */
+int nvram_read_error_log(char *buff, int length,
+ unsigned int *err_type, unsigned int *error_log_cnt)
+{
+ return nvram_read_partition(&rtas_log_partition, buff, length,
+ err_type, error_log_cnt);
+}
+
/* This doesn't actually zero anything, but it sets the event_logged
* word to tell that this event is safely in syslog.
*/
@@ -405,6 +470,349 @@ static int __init pseries_nvram_init_os_partition(struct nvram_os_partition
return 0;
}
+/*
+ * Are we using the ibm,rtas-log for oops/panic reports? And if so,
+ * would logging this oops/panic overwrite an RTAS event that rtas_errd
+ * hasn't had a chance to read and process? Return 1 if so, else 0.
+ *
+ * We assume that if rtas_errd hasn't read the RTAS event in
+ * NVRAM_RTAS_READ_TIMEOUT seconds, it's probably not going to.
+ */
+static int clobbering_unread_rtas_event(void)
+{
+ return (oops_log_partition.index == rtas_log_partition.index
+ && last_unread_rtas_event
+ && get_seconds() - last_unread_rtas_event <=
+ NVRAM_RTAS_READ_TIMEOUT);
+}
+
+/* Derived from logfs_compress() */
+static int nvram_compress(const void *in, void *out, size_t inlen,
+ size_t outlen)
+{
+ int err, ret;
+
+ ret = -EIO;
+ err = zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS,
+ MEM_LEVEL, Z_DEFAULT_STRATEGY);
+ 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_deflate(&stream, Z_FINISH);
+ if (err != Z_STREAM_END)
+ goto error;
+
+ err = zlib_deflateEnd(&stream);
+ if (err != Z_OK)
+ goto error;
+
+ if (stream.total_out >= stream.total_in)
+ goto error;
+
+ ret = stream.total_out;
+error:
+ return ret;
+}
+
+/* Compress the text from big_oops_buf into oops_buf. */
+static int zip_oops(size_t text_len)
+{
+ struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf;
+ int zipped_len = nvram_compress(big_oops_buf, oops_data, text_len,
+ oops_data_sz);
+ if (zipped_len < 0) {
+ pr_err("nvram: compression failed; returned %d\n", zipped_len);
+ pr_err("nvram: logging uncompressed oops/panic report\n");
+ return -1;
+ }
+ oops_hdr->version = OOPS_HDR_VERSION;
+ oops_hdr->report_length = (u16) zipped_len;
+ oops_hdr->timestamp = get_seconds();
+ return 0;
+}
+
+#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 */
+ read_type = -1;
+ return 0;
+}
+
+/**
+ * nvram_pstore_write - pstore write callback for nvram
+ * @type: Type of message logged
+ * @reason: reason behind dump (oops/panic)
+ * @id: identifier to indicate the write performed
+ * @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
+ * @size: number of bytes written to the registered buffer
+ * @psi: registered pstore_info structure
+ *
+ * Called by pstore_dump() when an oops or panic report is logged in the
+ * printk buffer.
+ * Returns 0 on successful write.
+ */
+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,
+ struct pstore_info *psi)
+{
+ int rc;
+ unsigned int err_type = ERR_TYPE_KERNEL_PANIC;
+ struct oops_log_info *oops_hdr = (struct oops_log_info *) oops_buf;
+
+ /* part 1 has the recent messages from printk buffer */
+ if (part > 1 || type != PSTORE_TYPE_DMESG ||
+ clobbering_unread_rtas_event())
+ return -1;
+
+ oops_hdr->version = OOPS_HDR_VERSION;
+ 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;
+ }
+
+ rc = nvram_write_os_partition(&oops_log_partition, oops_buf,
+ (int) (sizeof(*oops_hdr) + oops_hdr->report_length), err_type,
+ count);
+
+ if (rc != 0)
+ return rc;
+
+ *id = part;
+ return 0;
+}
+
+/*
+ * Reads the oops/panic report, rtas, of-config and common partition.
+ * Returns the length of the data we read from each partition.
+ * Returns 0 if we've been called before.
+ */
+static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type,
+ int *count, struct timespec *time, char **buf,
+ 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;
+ loff_t p;
+
+read_partition:
+ read_type++;
+
+ switch (nvram_type_ids[read_type]) {
+ case PSTORE_TYPE_DMESG:
+ part = &oops_log_partition;
+ *type = PSTORE_TYPE_DMESG;
+ break;
+ case PSTORE_TYPE_PPC_RTAS:
+ part = &rtas_log_partition;
+ *type = PSTORE_TYPE_PPC_RTAS;
+ time->tv_sec = last_rtas_event;
+ time->tv_nsec = 0;
+ break;
+ case PSTORE_TYPE_PPC_OF:
+ sig = NVRAM_SIG_OF;
+ part = &of_config_partition;
+ *type = PSTORE_TYPE_PPC_OF;
+ *id = PSTORE_TYPE_PPC_OF;
+ time->tv_sec = 0;
+ time->tv_nsec = 0;
+ break;
+ case PSTORE_TYPE_PPC_COMMON:
+ sig = NVRAM_SIG_SYS;
+ part = &common_partition;
+ *type = PSTORE_TYPE_PPC_COMMON;
+ *id = PSTORE_TYPE_PPC_COMMON;
+ time->tv_sec = 0;
+ time->tv_nsec = 0;
+ break;
+ default:
+ return 0;
+ }
+
+ if (!part->os_partition) {
+ p = nvram_find_partition(part->name, sig, &size);
+ if (p <= 0) {
+ pr_err("nvram: Failed to find partition %s, "
+ "err %d\n", part->name, (int)p);
+ return 0;
+ }
+ part->index = p;
+ part->size = size;
+ }
+
+ buff = kmalloc(part->size, GFP_KERNEL);
+
+ if (!buff)
+ return -ENOMEM;
+
+ if (nvram_read_partition(part, buff, part->size, &err_type, &id_no)) {
+ kfree(buff);
+ return 0;
+ }
+
+ *count = 0;
+
+ if (part->os_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);
+
+ 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);
+ }
+
+ time->tv_sec = oops_hdr->timestamp;
+ time->tv_nsec = 0;
+ return oops_hdr->report_length;
+ }
+
+ *buf = buff;
+ return part->size;
+}
+
+static struct pstore_info nvram_pstore_info = {
+ .owner = THIS_MODULE,
+ .name = "nvram",
+ .open = nvram_pstore_open,
+ .read = nvram_pstore_read,
+ .write = nvram_pstore_write,
+};
+
+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;
+ }
+
+ rc = pstore_register(&nvram_pstore_info);
+ if (rc != 0)
+ pr_err("nvram: pstore_register() failed, defaults to "
+ "kmsg_dump; returned %d\n", rc);
+
+ return rc;
+}
+#else
+static int nvram_pstore_init(void)
+{
+ return -1;
+}
+#endif
+
static void __init nvram_init_oops_partition(int rtas_partition_exists)
{
int rc;
@@ -425,9 +833,8 @@ static void __init nvram_init_oops_partition(int rtas_partition_exists)
oops_log_partition.name);
return;
}
- oops_len = (u16*) oops_buf;
- oops_data = oops_buf + sizeof(u16);
- oops_data_sz = oops_log_partition.size - sizeof(u16);
+ oops_data = oops_buf + sizeof(struct oops_log_info);
+ oops_data_sz = oops_log_partition.size - sizeof(struct oops_log_info);
/*
* Figure compression (preceded by elimination of each line's <n>
@@ -452,6 +859,11 @@ 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);
@@ -501,70 +913,6 @@ int __init pSeries_nvram_init(void)
return 0;
}
-/*
- * Are we using the ibm,rtas-log for oops/panic reports? And if so,
- * would logging this oops/panic overwrite an RTAS event that rtas_errd
- * hasn't had a chance to read and process? Return 1 if so, else 0.
- *
- * We assume that if rtas_errd hasn't read the RTAS event in
- * NVRAM_RTAS_READ_TIMEOUT seconds, it's probably not going to.
- */
-static int clobbering_unread_rtas_event(void)
-{
- return (oops_log_partition.index == rtas_log_partition.index
- && last_unread_rtas_event
- && get_seconds() - last_unread_rtas_event <=
- NVRAM_RTAS_READ_TIMEOUT);
-}
-
-/* Derived from logfs_compress() */
-static int nvram_compress(const void *in, void *out, size_t inlen,
- size_t outlen)
-{
- int err, ret;
-
- ret = -EIO;
- err = zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS,
- MEM_LEVEL, Z_DEFAULT_STRATEGY);
- 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_deflate(&stream, Z_FINISH);
- if (err != Z_STREAM_END)
- goto error;
-
- err = zlib_deflateEnd(&stream);
- if (err != Z_OK)
- goto error;
-
- if (stream.total_out >= stream.total_in)
- goto error;
-
- ret = stream.total_out;
-error:
- return ret;
-}
-
-/* Compress the text from big_oops_buf into oops_buf. */
-static int zip_oops(size_t text_len)
-{
- int zipped_len = nvram_compress(big_oops_buf, oops_data, text_len,
- oops_data_sz);
- if (zipped_len < 0) {
- pr_err("nvram: compression failed; returned %d\n", zipped_len);
- pr_err("nvram: logging uncompressed oops/panic report\n");
- return -1;
- }
- *oops_len = (u16) zipped_len;
- return 0;
-}
/*
* This is our kmsg_dump callback, called after an oops or panic report
@@ -576,6 +924,7 @@ static int zip_oops(size_t text_len)
static void oops_to_nvram(struct kmsg_dumper *dumper,
enum kmsg_dump_reason reason)
{
+ struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf;
static unsigned int oops_count = 0;
static bool panicking = false;
static DEFINE_SPINLOCK(lock);
@@ -619,14 +968,17 @@ static void oops_to_nvram(struct kmsg_dumper *dumper,
}
if (rc != 0) {
kmsg_dump_rewind(dumper);
- kmsg_dump_get_buffer(dumper, true,
+ kmsg_dump_get_buffer(dumper, false,
oops_data, oops_data_sz, &text_len);
err_type = ERR_TYPE_KERNEL_PANIC;
- *oops_len = (u16) text_len;
+ oops_hdr->version = OOPS_HDR_VERSION;
+ oops_hdr->report_length = (u16) text_len;
+ oops_hdr->timestamp = get_seconds();
}
(void) nvram_write_os_partition(&oops_log_partition, oops_buf,
- (int) (sizeof(*oops_len) + *oops_len), err_type, ++oops_count);
+ (int) (sizeof(*oops_hdr) + oops_hdr->report_length), err_type,
+ ++oops_count);
spin_unlock_irqrestore(&lock, flags);
}