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Message-ID: <20150205193604.24669.67159.stgit@localhost.localdomain>
Date: Fri, 06 Feb 2015 01:06:04 +0530
From: Hari Bathini <hbathini@...ux.vnet.ibm.com>
To: Tony Luck <tony.luck@...el.com>, Kees Cook <keescook@...omium.org>,
Anton Vorontsov <anton@...msg.org>,
lkml <linux-kernel@...r.kernel.org>,
linuxppc-dev <linuxppc-dev@...abs.org>,
Colin Cross <ccross@...roid.com>
Cc: Mahesh J Salgaonkar <mahesh@...ux.vnet.ibm.com>,
Michael Ellerman <mpe@...erman.id.au>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: [PATCH v5 1/4] powerpc/nvram: move generic code for nvram and pstore
With minor checks, we can move most of the code for nvram
under pseries to a common place to be re-used by other
powerpc platforms like powernv. This patch moves such
common code to arch/powerpc/kernel/nvram_64.c file.
Signed-off-by: Hari Bathini <hbathini@...ux.vnet.ibm.com>
---
arch/powerpc/include/asm/nvram.h | 50 ++
arch/powerpc/include/asm/rtas.h | 4
arch/powerpc/kernel/nvram_64.c | 656 ++++++++++++++++++++++++++++++++
arch/powerpc/platforms/pseries/nvram.c | 665 --------------------------------
4 files changed, 714 insertions(+), 661 deletions(-)
diff --git a/arch/powerpc/include/asm/nvram.h b/arch/powerpc/include/asm/nvram.h
index b0fe0fe..09a518b 100644
--- a/arch/powerpc/include/asm/nvram.h
+++ b/arch/powerpc/include/asm/nvram.h
@@ -9,12 +9,43 @@
#ifndef _ASM_POWERPC_NVRAM_H
#define _ASM_POWERPC_NVRAM_H
-
+#include <linux/types.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <uapi/asm/nvram.h>
+/*
+ * Set oops header version to distinguish 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
+
+struct err_log_info {
+ __be32 error_type;
+ __be32 seq_num;
+};
+
+struct nvram_os_partition {
+ const char *name;
+ int req_size; /* desired size, in bytes */
+ 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 */
+};
+
+struct oops_log_info {
+ __be16 version;
+ __be16 report_length;
+ __be64 timestamp;
+} __attribute__((packed));
+
+extern struct nvram_os_partition oops_log_partition;
+
#ifdef CONFIG_PPC_PSERIES
+extern struct nvram_os_partition rtas_log_partition;
+
extern int nvram_write_error_log(char * buff, int length,
unsigned int err_type, unsigned int err_seq);
extern int nvram_read_error_log(char * buff, int length,
@@ -50,6 +81,23 @@ extern void pmac_xpram_write(int xpaddr, u8 data);
/* Synchronize NVRAM */
extern void nvram_sync(void);
+/* Initialize NVRAM OS partition */
+extern int __init nvram_init_os_partition(struct nvram_os_partition *part);
+
+/* Initialize NVRAM oops partition */
+extern void __init nvram_init_oops_partition(int rtas_partition_exists);
+
+/* Read a NVRAM partition */
+extern int nvram_read_partition(struct nvram_os_partition *part, char *buff,
+ int length, unsigned int *err_type,
+ unsigned int *error_log_cnt);
+
+/* Write to NVRAM OS partition */
+extern int nvram_write_os_partition(struct nvram_os_partition *part,
+ char *buff, int length,
+ unsigned int err_type,
+ unsigned int error_log_cnt);
+
/* Determine NVRAM size */
extern ssize_t nvram_get_size(void);
diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h
index b390f55..123d7ff 100644
--- a/arch/powerpc/include/asm/rtas.h
+++ b/arch/powerpc/include/asm/rtas.h
@@ -343,8 +343,12 @@ extern int early_init_dt_scan_rtas(unsigned long node,
extern void pSeries_log_error(char *buf, unsigned int err_type, int fatal);
#ifdef CONFIG_PPC_PSERIES
+extern unsigned long last_rtas_event;
+extern int clobbering_unread_rtas_event(void);
extern int pseries_devicetree_update(s32 scope);
extern void post_mobility_fixup(void);
+#else
+static inline int clobbering_unread_rtas_event(void) { return 0; }
#endif
#ifdef CONFIG_PPC_RTAS_DAEMON
diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
index 34f7c9b..42e5c6a 100644
--- a/arch/powerpc/kernel/nvram_64.c
+++ b/arch/powerpc/kernel/nvram_64.c
@@ -26,6 +26,9 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
+#include <linux/kmsg_dump.h>
+#include <linux/pstore.h>
+#include <linux/zlib.h>
#include <asm/uaccess.h>
#include <asm/nvram.h>
#include <asm/rtas.h>
@@ -54,6 +57,659 @@ struct nvram_partition {
static LIST_HEAD(nvram_partitions);
+#ifdef CONFIG_PPC_PSERIES
+struct nvram_os_partition rtas_log_partition = {
+ .name = "ibm,rtas-log",
+ .req_size = 2079,
+ .min_size = 1055,
+ .index = -1,
+ .os_partition = true
+};
+#endif
+
+struct nvram_os_partition oops_log_partition = {
+ .name = "lnx,oops-log",
+ .req_size = 4000,
+ .min_size = 2000,
+ .index = -1,
+ .os_partition = true
+};
+
+static const char *nvram_os_partitions[] = {
+#ifdef CONFIG_PPC_PSERIES
+ "ibm,rtas-log",
+#endif
+ "lnx,oops-log",
+ NULL
+};
+
+static void oops_to_nvram(struct kmsg_dumper *dumper,
+ enum kmsg_dump_reason reason);
+
+static struct kmsg_dumper nvram_kmsg_dumper = {
+ .dump = oops_to_nvram
+};
+
+/*
+ * For capturing and compressing an oops or panic report...
+
+ * big_oops_buf[] holds the uncompressed text we're capturing.
+ *
+ * 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_log_info points to the header. oops_data points to the compressed text.
+ *
+ * +- oops_buf
+ * | +- oops_data
+ * v v
+ * +-----------+-----------+-----------+------------------------+
+ * | version | length | timestamp | text |
+ * | (2 bytes) | (2 bytes) | (8 bytes) | (oops_data_sz bytes) |
+ * +-----------+-----------+-----------+------------------------+
+ * ^
+ * +- 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 char *oops_data;
+static size_t oops_data_sz;
+
+/* Compression parameters */
+#define COMPR_LEVEL 6
+#define WINDOW_BITS 12
+#define MEM_LEVEL 4
+static struct z_stream_s stream;
+
+#ifdef CONFIG_PSTORE
+#ifdef CONFIG_PPC_PSERIES
+static struct nvram_os_partition of_config_partition = {
+ .name = "of-config",
+ .index = -1,
+ .os_partition = false
+};
+#endif
+
+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_COMMON,
+ -1,
+ -1,
+ -1
+};
+static int read_type;
+#endif
+
+/* nvram_write_os_partition
+ *
+ * We need to buffer the error logs into nvram to ensure that we have
+ * the failure information to decode. If we have a severe error there
+ * is no way to guarantee that the OS or the machine is in a state to
+ * get back to user land and write the error to disk. For example if
+ * the SCSI device driver causes a Machine Check by writing to a bad
+ * IO address, there is no way of guaranteeing that the device driver
+ * is in any state that is would also be able to write the error data
+ * captured to disk, thus we buffer it in NVRAM for analysis on the
+ * next boot.
+ *
+ * In NVRAM the partition containing the error log buffer will looks like:
+ * Header (in bytes):
+ * +-----------+----------+--------+------------+------------------+
+ * | signature | checksum | length | name | data |
+ * |0 |1 |2 3|4 15|16 length-1|
+ * +-----------+----------+--------+------------+------------------+
+ *
+ * The 'data' section would look like (in bytes):
+ * +--------------+------------+-----------------------------------+
+ * | event_logged | sequence # | error log |
+ * |0 3|4 7|8 error_log_size-1|
+ * +--------------+------------+-----------------------------------+
+ *
+ * event_logged: 0 if event has not been logged to syslog, 1 if it has
+ * sequence #: The unique sequence # for each event. (until it wraps)
+ * error log: The error log from event_scan
+ */
+int nvram_write_os_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 (part->index == -1)
+ return -ESPIPE;
+
+ if (length > part->size)
+ length = part->size;
+
+ info.error_type = cpu_to_be32(err_type);
+ info.seq_num = cpu_to_be32(error_log_cnt);
+
+ tmp_index = part->index;
+
+ rc = ppc_md.nvram_write((char *)&info, sizeof(struct err_log_info),
+ &tmp_index);
+ if (rc <= 0) {
+ pr_err("%s: Failed nvram_write (%d)\n", __func__, rc);
+ return rc;
+ }
+
+ rc = ppc_md.nvram_write(buff, length, &tmp_index);
+ if (rc <= 0) {
+ pr_err("%s: Failed nvram_write (%d)\n", __func__, rc);
+ return rc;
+ }
+
+ return 0;
+}
+
+/* nvram_read_partition
+ *
+ * Reads nvram partition for at most 'length'
+ */
+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 (part->index == -1)
+ return -1;
+
+ if (length > part->size)
+ length = part->size;
+
+ tmp_index = part->index;
+
+ 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", __func__, rc);
+ return rc;
+ }
+ }
+
+ rc = ppc_md.nvram_read(buff, length, &tmp_index);
+ if (rc <= 0) {
+ pr_err("%s: Failed nvram_read (%d)\n", __func__, rc);
+ return rc;
+ }
+
+ if (part->os_partition) {
+ *error_log_cnt = be32_to_cpu(info.seq_num);
+ *err_type = be32_to_cpu(info.error_type);
+ }
+
+ return 0;
+}
+
+/* nvram_init_os_partition
+ *
+ * This sets up a partition with an "OS" signature.
+ *
+ * The general strategy is the following:
+ * 1.) If a partition with the indicated name already exists...
+ * - If it's large enough, use it.
+ * - Otherwise, recycle it and keep going.
+ * 2.) Search for a free partition that is large enough.
+ * 3.) If there's not a free partition large enough, recycle any obsolete
+ * OS partitions and try again.
+ * 4.) Will first try getting a chunk that will satisfy the requested size.
+ * 5.) If a chunk of the requested size cannot be allocated, then try finding
+ * a chunk that will satisfy the minum needed.
+ *
+ * Returns 0 on success, else -1.
+ */
+int __init nvram_init_os_partition(struct nvram_os_partition *part)
+{
+ loff_t p;
+ int size;
+
+ /* Look for ours */
+ p = nvram_find_partition(part->name, NVRAM_SIG_OS, &size);
+
+ /* Found one but too small, remove it */
+ if (p && size < part->min_size) {
+ pr_info("nvram: Found too small %s partition,"
+ " removing it...\n", part->name);
+ nvram_remove_partition(part->name, NVRAM_SIG_OS, NULL);
+ p = 0;
+ }
+
+ /* Create one if we didn't find */
+ if (!p) {
+ p = nvram_create_partition(part->name, NVRAM_SIG_OS,
+ part->req_size, part->min_size);
+ if (p == -ENOSPC) {
+ pr_info("nvram: No room to create %s partition, "
+ "deleting any obsolete OS partitions...\n",
+ part->name);
+ nvram_remove_partition(NULL, NVRAM_SIG_OS,
+ nvram_os_partitions);
+ p = nvram_create_partition(part->name, NVRAM_SIG_OS,
+ part->req_size, part->min_size);
+ }
+ }
+
+ if (p <= 0) {
+ pr_err("nvram: Failed to find or create %s"
+ " partition, err %d\n", part->name, (int)p);
+ return -1;
+ }
+
+ part->index = p;
+ part->size = nvram_get_partition_size(p) - sizeof(struct err_log_info);
+
+ return 0;
+}
+
+/* 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 = cpu_to_be16(OOPS_HDR_VERSION);
+ oops_hdr->report_length = cpu_to_be16(zipped_len);
+ oops_hdr->timestamp = cpu_to_be64(get_seconds());
+ return 0;
+}
+
+#ifdef CONFIG_PSTORE
+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
+ * @compressed: Flag to indicate the log is compressed
+ * @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,
+ bool compressed, 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))
+ return -1;
+
+ if (clobbering_unread_rtas_event())
+ return -1;
+
+ oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
+ oops_hdr->report_length = cpu_to_be16(size);
+ oops_hdr->timestamp = cpu_to_be64(get_seconds());
+
+ if (compressed)
+ err_type = ERR_TYPE_KERNEL_PANIC_GZ;
+
+ rc = nvram_write_os_partition(&oops_log_partition, oops_buf,
+ (int) (sizeof(*oops_hdr) + size), 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,
+ 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;
+ int sig = 0;
+ loff_t p;
+
+ 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_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;
+#ifdef CONFIG_PPC_PSERIES
+ 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;
+#endif
+ 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) {
+ size_t length, hdr_size;
+
+ oops_hdr = (struct oops_log_info *)buff;
+ if (be16_to_cpu(oops_hdr->version) < OOPS_HDR_VERSION) {
+ /* Old format oops header had 2-byte record size */
+ hdr_size = sizeof(u16);
+ length = be16_to_cpu(oops_hdr->version);
+ time->tv_sec = 0;
+ time->tv_nsec = 0;
+ } else {
+ hdr_size = sizeof(*oops_hdr);
+ length = be16_to_cpu(oops_hdr->report_length);
+ time->tv_sec = be64_to_cpu(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);
+
+ if (err_type == ERR_TYPE_KERNEL_PANIC_GZ)
+ *compressed = true;
+ else
+ *compressed = false;
+ return 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;
+
+ nvram_type_ids[2] = PSTORE_TYPE_PPC_RTAS;
+ nvram_type_ids[3] = PSTORE_TYPE_PPC_OF;
+
+ nvram_pstore_info.buf = oops_data;
+ nvram_pstore_info.bufsize = oops_data_sz;
+
+ spin_lock_init(&nvram_pstore_info.buf_lock);
+
+ 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
+
+void __init nvram_init_oops_partition(int rtas_partition_exists)
+{
+ int rc;
+
+ rc = nvram_init_os_partition(&oops_log_partition);
+ if (rc != 0) {
+#ifdef CONFIG_PPC_PSERIES
+ if (!rtas_partition_exists) {
+ pr_err("nvram: Failed to initialize oops partition!");
+ return;
+ }
+ pr_notice("nvram: Using %s partition to log both"
+ " RTAS errors and oops/panic reports\n",
+ rtas_log_partition.name);
+ memcpy(&oops_log_partition, &rtas_log_partition,
+ sizeof(rtas_log_partition));
+#else
+ pr_err("nvram: Failed to initialize oops partition!");
+ return;
+#endif
+ }
+ oops_buf = kmalloc(oops_log_partition.size, GFP_KERNEL);
+ if (!oops_buf) {
+ pr_err("nvram: No memory for %s partition\n",
+ oops_log_partition.name);
+ return;
+ }
+ 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
+ * 45% of its original size.
+ */
+ 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);
+ if (!stream.workspace) {
+ pr_err("nvram: No memory for compression workspace; "
+ "skipping compression of %s partition data\n",
+ oops_log_partition.name);
+ kfree(big_oops_buf);
+ big_oops_buf = NULL;
+ }
+ } else {
+ pr_err("No memory for uncompressed %s data; "
+ "skipping compression\n", oops_log_partition.name);
+ stream.workspace = NULL;
+ }
+
+ rc = kmsg_dump_register(&nvram_kmsg_dumper);
+ if (rc != 0) {
+ pr_err("nvram: kmsg_dump_register() failed; returned %d\n", rc);
+ kfree(oops_buf);
+ kfree(big_oops_buf);
+ kfree(stream.workspace);
+ }
+}
+
+/*
+ * This is our kmsg_dump callback, called after an oops or panic report
+ * has been written to the printk buffer. We want to capture as much
+ * of the printk buffer as possible. First, capture as much as we can
+ * that we think will compress sufficiently to fit in the lnx,oops-log
+ * partition. If that's too much, go back and capture uncompressed text.
+ */
+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);
+ unsigned long flags;
+ size_t text_len;
+ unsigned int err_type = ERR_TYPE_KERNEL_PANIC_GZ;
+ int rc = -1;
+
+ switch (reason) {
+ case KMSG_DUMP_RESTART:
+ case KMSG_DUMP_HALT:
+ case KMSG_DUMP_POWEROFF:
+ /* These are almost always orderly shutdowns. */
+ return;
+ case KMSG_DUMP_OOPS:
+ break;
+ case KMSG_DUMP_PANIC:
+ panicking = true;
+ break;
+ case KMSG_DUMP_EMERG:
+ if (panicking)
+ /* Panic report already captured. */
+ return;
+ break;
+ default:
+ pr_err("%s: ignoring unrecognized KMSG_DUMP_* reason %d\n",
+ __func__, (int) reason);
+ return;
+ }
+
+ if (clobbering_unread_rtas_event())
+ return;
+
+ if (!spin_trylock_irqsave(&lock, flags))
+ return;
+
+ if (big_oops_buf) {
+ kmsg_dump_get_buffer(dumper, false,
+ big_oops_buf, big_oops_buf_sz, &text_len);
+ rc = zip_oops(text_len);
+ }
+ if (rc != 0) {
+ kmsg_dump_rewind(dumper);
+ kmsg_dump_get_buffer(dumper, false,
+ oops_data, oops_data_sz, &text_len);
+ err_type = ERR_TYPE_KERNEL_PANIC;
+ oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
+ oops_hdr->report_length = cpu_to_be16(text_len);
+ oops_hdr->timestamp = cpu_to_be64(get_seconds());
+ }
+
+ (void) nvram_write_os_partition(&oops_log_partition, oops_buf,
+ (int) (sizeof(*oops_hdr) + text_len), err_type,
+ ++oops_count);
+
+ spin_unlock_irqrestore(&lock, flags);
+}
+
static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin)
{
int size;
diff --git a/arch/powerpc/platforms/pseries/nvram.c b/arch/powerpc/platforms/pseries/nvram.c
index 054a0ed..97b8fc6 100644
--- a/arch/powerpc/platforms/pseries/nvram.c
+++ b/arch/powerpc/platforms/pseries/nvram.c
@@ -30,129 +30,17 @@
/* Max bytes to read/write in one go */
#define NVRW_CNT 0x20
-/*
- * Set oops header version to distinguish 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 */
static DEFINE_SPINLOCK(nvram_lock);
-struct err_log_info {
- __be32 error_type;
- __be32 seq_num;
-};
-
-struct nvram_os_partition {
- const char *name;
- int req_size; /* desired size, in bytes */
- 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,
- .os_partition = true
-};
-
-static struct nvram_os_partition oops_log_partition = {
- .name = "lnx,oops-log",
- .req_size = 4000,
- .min_size = 2000,
- .index = -1,
- .os_partition = true
-};
-
-static const char *pseries_nvram_os_partitions[] = {
- "ibm,rtas-log",
- "lnx,oops-log",
- NULL
-};
-
-struct oops_log_info {
- __be16 version;
- __be16 report_length;
- __be64 timestamp;
-} __attribute__((packed));
-
-static void oops_to_nvram(struct kmsg_dumper *dumper,
- enum kmsg_dump_reason reason);
-
-static struct kmsg_dumper nvram_kmsg_dumper = {
- .dump = oops_to_nvram
-};
-
/* See clobbering_unread_rtas_event() */
#define NVRAM_RTAS_READ_TIMEOUT 5 /* seconds */
static unsigned long last_unread_rtas_event; /* timestamp */
-/*
- * For capturing and compressing an oops or panic report...
-
- * big_oops_buf[] holds the uncompressed text we're capturing.
- *
- * 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_log_info points to the header. oops_data points to the compressed text.
- *
- * +- oops_buf
- * | +- oops_data
- * v v
- * +-----------+-----------+-----------+------------------------+
- * | version | length | timestamp | text |
- * | (2 bytes) | (2 bytes) | (8 bytes) | (oops_data_sz bytes) |
- * +-----------+-----------+-----------+------------------------+
- * ^
- * +- 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 char *oops_data;
-static size_t oops_data_sz;
-
-/* Compression parameters */
-#define COMPR_LEVEL 6
-#define WINDOW_BITS 12
-#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;
+unsigned long last_rtas_event;
#endif
static ssize_t pSeries_nvram_read(char *buf, size_t count, loff_t *index)
@@ -246,73 +134,11 @@ static ssize_t pSeries_nvram_get_size(void)
return nvram_size ? nvram_size : -ENODEV;
}
-
-/* nvram_write_os_partition, nvram_write_error_log
+/* nvram_write_error_log
*
* We need to buffer the error logs into nvram to ensure that we have
- * the failure information to decode. If we have a severe error there
- * is no way to guarantee that the OS or the machine is in a state to
- * get back to user land and write the error to disk. For example if
- * the SCSI device driver causes a Machine Check by writing to a bad
- * IO address, there is no way of guaranteeing that the device driver
- * is in any state that is would also be able to write the error data
- * captured to disk, thus we buffer it in NVRAM for analysis on the
- * next boot.
- *
- * In NVRAM the partition containing the error log buffer will looks like:
- * Header (in bytes):
- * +-----------+----------+--------+------------+------------------+
- * | signature | checksum | length | name | data |
- * |0 |1 |2 3|4 15|16 length-1|
- * +-----------+----------+--------+------------+------------------+
- *
- * The 'data' section would look like (in bytes):
- * +--------------+------------+-----------------------------------+
- * | event_logged | sequence # | error log |
- * |0 3|4 7|8 error_log_size-1|
- * +--------------+------------+-----------------------------------+
- *
- * event_logged: 0 if event has not been logged to syslog, 1 if it has
- * sequence #: The unique sequence # for each event. (until it wraps)
- * error log: The error log from event_scan
+ * the failure information to decode.
*/
-static int nvram_write_os_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 (part->index == -1) {
- return -ESPIPE;
- }
-
- if (length > part->size) {
- length = part->size;
- }
-
- info.error_type = cpu_to_be32(err_type);
- info.seq_num = cpu_to_be32(error_log_cnt);
-
- tmp_index = part->index;
-
- rc = ppc_md.nvram_write((char *)&info, sizeof(struct err_log_info), &tmp_index);
- if (rc <= 0) {
- pr_err("%s: Failed nvram_write (%d)\n", __func__, rc);
- return rc;
- }
-
- rc = ppc_md.nvram_write(buff, length, &tmp_index);
- if (rc <= 0) {
- pr_err("%s: Failed nvram_write (%d)\n", __func__, rc);
- return rc;
- }
-
- return 0;
-}
-
int nvram_write_error_log(char * buff, int length,
unsigned int err_type, unsigned int error_log_cnt)
{
@@ -328,50 +154,6 @@ int nvram_write_error_log(char * buff, int length,
return rc;
}
-/* nvram_read_partition
- *
- * Reads nvram partition for at most 'length'
- */
-static 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 (part->index == -1)
- return -1;
-
- if (length > part->size)
- length = part->size;
-
- tmp_index = part->index;
-
- 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", __func__, rc);
- return rc;
- }
- }
-
- rc = ppc_md.nvram_read(buff, length, &tmp_index);
- if (rc <= 0) {
- pr_err("%s: Failed nvram_read (%d)\n", __func__, rc);
- return rc;
- }
-
- if (part->os_partition) {
- *error_log_cnt = be32_to_cpu(info.seq_num);
- *err_type = be32_to_cpu(info.error_type);
- }
-
- return 0;
-}
-
/* nvram_read_error_log
*
* Reads nvram for error log for at most 'length'
@@ -407,67 +189,6 @@ int nvram_clear_error_log(void)
return 0;
}
-/* pseries_nvram_init_os_partition
- *
- * This sets up a partition with an "OS" signature.
- *
- * The general strategy is the following:
- * 1.) If a partition with the indicated name already exists...
- * - If it's large enough, use it.
- * - Otherwise, recycle it and keep going.
- * 2.) Search for a free partition that is large enough.
- * 3.) If there's not a free partition large enough, recycle any obsolete
- * OS partitions and try again.
- * 4.) Will first try getting a chunk that will satisfy the requested size.
- * 5.) If a chunk of the requested size cannot be allocated, then try finding
- * a chunk that will satisfy the minum needed.
- *
- * Returns 0 on success, else -1.
- */
-static int __init pseries_nvram_init_os_partition(struct nvram_os_partition
- *part)
-{
- loff_t p;
- int size;
-
- /* Look for ours */
- p = nvram_find_partition(part->name, NVRAM_SIG_OS, &size);
-
- /* Found one but too small, remove it */
- if (p && size < part->min_size) {
- pr_info("nvram: Found too small %s partition,"
- " removing it...\n", part->name);
- nvram_remove_partition(part->name, NVRAM_SIG_OS, NULL);
- p = 0;
- }
-
- /* Create one if we didn't find */
- if (!p) {
- p = nvram_create_partition(part->name, NVRAM_SIG_OS,
- part->req_size, part->min_size);
- if (p == -ENOSPC) {
- pr_info("nvram: No room to create %s partition, "
- "deleting any obsolete OS partitions...\n",
- part->name);
- nvram_remove_partition(NULL, NVRAM_SIG_OS,
- pseries_nvram_os_partitions);
- p = nvram_create_partition(part->name, NVRAM_SIG_OS,
- part->req_size, part->min_size);
- }
- }
-
- if (p <= 0) {
- pr_err("nvram: Failed to find or create %s"
- " partition, err %d\n", part->name, (int)p);
- return -1;
- }
-
- part->index = p;
- part->size = nvram_get_partition_size(p) - sizeof(struct err_log_info);
-
- 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
@@ -476,7 +197,7 @@ static int __init pseries_nvram_init_os_partition(struct nvram_os_partition
* 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)
+int clobbering_unread_rtas_event(void)
{
return (oops_log_partition.index == rtas_log_partition.index
&& last_unread_rtas_event
@@ -484,313 +205,6 @@ static int clobbering_unread_rtas_event(void)
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 = cpu_to_be16(OOPS_HDR_VERSION);
- oops_hdr->report_length = cpu_to_be16(zipped_len);
- oops_hdr->timestamp = cpu_to_be64(get_seconds());
- return 0;
-}
-
-#ifdef CONFIG_PSTORE
-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
- * @compressed: Flag to indicate the log is compressed
- * @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,
- bool compressed, 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 = cpu_to_be16(OOPS_HDR_VERSION);
- oops_hdr->report_length = cpu_to_be16(size);
- oops_hdr->timestamp = cpu_to_be64(get_seconds());
-
- if (compressed)
- err_type = ERR_TYPE_KERNEL_PANIC_GZ;
-
- rc = nvram_write_os_partition(&oops_log_partition, oops_buf,
- (int) (sizeof(*oops_hdr) + size), 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,
- 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;
- int sig = 0;
- loff_t p;
-
- 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) {
- size_t length, hdr_size;
-
- oops_hdr = (struct oops_log_info *)buff;
- if (be16_to_cpu(oops_hdr->version) < OOPS_HDR_VERSION) {
- /* Old format oops header had 2-byte record size */
- hdr_size = sizeof(u16);
- length = be16_to_cpu(oops_hdr->version);
- time->tv_sec = 0;
- time->tv_nsec = 0;
- } else {
- hdr_size = sizeof(*oops_hdr);
- length = be16_to_cpu(oops_hdr->report_length);
- time->tv_sec = be64_to_cpu(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);
-
- if (err_type == ERR_TYPE_KERNEL_PANIC_GZ)
- *compressed = true;
- else
- *compressed = false;
- return 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;
-
- nvram_pstore_info.buf = oops_data;
- nvram_pstore_info.bufsize = oops_data_sz;
-
- spin_lock_init(&nvram_pstore_info.buf_lock);
-
- 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;
-
- rc = pseries_nvram_init_os_partition(&oops_log_partition);
- if (rc != 0) {
- if (!rtas_partition_exists)
- return;
- pr_notice("nvram: Using %s partition to log both"
- " RTAS errors and oops/panic reports\n",
- rtas_log_partition.name);
- memcpy(&oops_log_partition, &rtas_log_partition,
- sizeof(rtas_log_partition));
- }
- oops_buf = kmalloc(oops_log_partition.size, GFP_KERNEL);
- if (!oops_buf) {
- pr_err("nvram: No memory for %s partition\n",
- oops_log_partition.name);
- return;
- }
- 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
- * 45% of its original size.
- */
- 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);
- if (!stream.workspace) {
- pr_err("nvram: No memory for compression workspace; "
- "skipping compression of %s partition data\n",
- oops_log_partition.name);
- kfree(big_oops_buf);
- big_oops_buf = NULL;
- }
- } else {
- pr_err("No memory for uncompressed %s data; "
- "skipping compression\n", oops_log_partition.name);
- stream.workspace = NULL;
- }
-
- rc = kmsg_dump_register(&nvram_kmsg_dumper);
- if (rc != 0) {
- pr_err("nvram: kmsg_dump_register() failed; returned %d\n", rc);
- kfree(oops_buf);
- kfree(big_oops_buf);
- kfree(stream.workspace);
- }
-}
-
static int __init pseries_nvram_init_log_partitions(void)
{
int rc;
@@ -798,7 +212,7 @@ static int __init pseries_nvram_init_log_partitions(void)
/* Scan nvram for partitions */
nvram_scan_partitions();
- rc = pseries_nvram_init_os_partition(&rtas_log_partition);
+ rc = nvram_init_os_partition(&rtas_log_partition);
nvram_init_oops_partition(rc == 0);
return 0;
}
@@ -834,72 +248,3 @@ int __init pSeries_nvram_init(void)
return 0;
}
-
-/*
- * This is our kmsg_dump callback, called after an oops or panic report
- * has been written to the printk buffer. We want to capture as much
- * of the printk buffer as possible. First, capture as much as we can
- * that we think will compress sufficiently to fit in the lnx,oops-log
- * partition. If that's too much, go back and capture uncompressed text.
- */
-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);
- unsigned long flags;
- size_t text_len;
- unsigned int err_type = ERR_TYPE_KERNEL_PANIC_GZ;
- int rc = -1;
-
- switch (reason) {
- case KMSG_DUMP_RESTART:
- case KMSG_DUMP_HALT:
- case KMSG_DUMP_POWEROFF:
- /* These are almost always orderly shutdowns. */
- return;
- case KMSG_DUMP_OOPS:
- break;
- case KMSG_DUMP_PANIC:
- panicking = true;
- break;
- case KMSG_DUMP_EMERG:
- if (panicking)
- /* Panic report already captured. */
- return;
- break;
- default:
- pr_err("%s: ignoring unrecognized KMSG_DUMP_* reason %d\n",
- __func__, (int) reason);
- return;
- }
-
- if (clobbering_unread_rtas_event())
- return;
-
- if (!spin_trylock_irqsave(&lock, flags))
- return;
-
- if (big_oops_buf) {
- kmsg_dump_get_buffer(dumper, false,
- big_oops_buf, big_oops_buf_sz, &text_len);
- rc = zip_oops(text_len);
- }
- if (rc != 0) {
- kmsg_dump_rewind(dumper);
- kmsg_dump_get_buffer(dumper, false,
- oops_data, oops_data_sz, &text_len);
- err_type = ERR_TYPE_KERNEL_PANIC;
- oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);
- oops_hdr->report_length = cpu_to_be16(text_len);
- oops_hdr->timestamp = cpu_to_be64(get_seconds());
- }
-
- (void) nvram_write_os_partition(&oops_log_partition, oops_buf,
- (int) (sizeof(*oops_hdr) + text_len), err_type,
- ++oops_count);
-
- spin_unlock_irqrestore(&lock, flags);
-}
--
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