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@linux.vnet.ibm.com>
[mpe: Move select of ZLIB_DEFLATE to PPC64 to fix the build]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

6 files changed, 715 insertions, 663 deletions

diff --git a/arch/powerpc/include/asm/nvram.h b/arch/powerpc/include/asm/nvram.h
index b0fe0fe4e626..09a518bb7c03 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 2e23e92a4372..d1bd001566df 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 34f7c9b7cd96..42e5c6a9c214 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/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 76483e3acd60..80614c6088bc 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -2,6 +2,7 @@ config PPC64
         bool "64-bit kernel"
         default n
         select HAVE_VIRT_CPU_ACCOUNTING
+        select ZLIB_DEFLATE
         help
           This option selects whether a 32-bit or a 64-bit kernel
           will be built.
diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig
index a758a9c3bbba..54c87d5d349d 100644
--- a/arch/powerpc/platforms/pseries/Kconfig
+++ b/arch/powerpc/platforms/pseries/Kconfig
@@ -16,7 +16,6 @@ config PPC_PSERIES
         select PPC_UDBG_16550
         select PPC_NATIVE
         select PPC_PCI_CHOICE if EXPERT
-        select ZLIB_DEFLATE
         select PPC_DOORBELL
         select HAVE_CONTEXT_TRACKING
         select HOTPLUG_CPU if SMP
diff --git a/arch/powerpc/platforms/pseries/nvram.c b/arch/powerpc/platforms/pseries/nvram.c
index 054a0ed5c7ee..533807efed61 100644
--- a/arch/powerpc/platforms/pseries/nvram.c
+++ b/arch/powerpc/platforms/pseries/nvram.c
@@ -20,7 +20,6 @@
 #include <linux/kmsg_dump.h>
 #include <linux/pstore.h>
 #include <linux/ctype.h>
-#include <linux/zlib.h>
 #include <asm/uaccess.h>
 #include <asm/nvram.h>
 #include <asm/rtas.h>
@@ -30,129 +29,17 @@
 /* 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 +133,11 @@ 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 +153,6 @@ 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 +188,6 @@ 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 +196,7 @@ 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 +204,6 @@ 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 +211,7 @@ 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 +247,3 @@ 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);
-}