[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/fs/pstore/ram.c b/src/kernel/linux/v4.14/fs/pstore/ram.c
new file mode 100644
index 0000000..8960c52
--- /dev/null
+++ b/src/kernel/linux/v4.14/fs/pstore/ram.c
@@ -0,0 +1,1029 @@
+/*
+ * RAM Oops/Panic logger
+ *
+ * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
+ * Copyright (C) 2011 Kees Cook <keescook@chromium.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/pstore.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/compiler.h>
+#include <linux/pstore_ram.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#define RAMOOPS_KERNMSG_HDR "===="
+#define MIN_MEM_SIZE 4096UL
+#ifdef __aarch64__
+#ifdef memcpy
+#undef memcpy
+#endif
+#define memcpy memcpy_toio
+#endif
+
+static ulong record_size = MIN_MEM_SIZE;
+module_param(record_size, ulong, 0400);
+MODULE_PARM_DESC(record_size,
+ "size of each dump done on oops/panic");
+
+static ulong ramoops_console_size = MIN_MEM_SIZE;
+module_param_named(console_size, ramoops_console_size, ulong, 0400);
+MODULE_PARM_DESC(console_size, "size of kernel console log");
+
+static ulong ramoops_ftrace_size = MIN_MEM_SIZE;
+module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400);
+MODULE_PARM_DESC(ftrace_size, "size of ftrace log");
+
+static ulong ramoops_pmsg_size = MIN_MEM_SIZE;
+module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400);
+MODULE_PARM_DESC(pmsg_size, "size of user space message log");
+
+static unsigned long long mem_address;
+module_param_hw(mem_address, ullong, other, 0400);
+MODULE_PARM_DESC(mem_address,
+ "start of reserved RAM used to store oops/panic logs");
+
+static ulong mem_size;
+module_param(mem_size, ulong, 0400);
+MODULE_PARM_DESC(mem_size,
+ "size of reserved RAM used to store oops/panic logs");
+
+static unsigned int mem_type;
+module_param(mem_type, uint, 0600);
+MODULE_PARM_DESC(mem_type,
+ "set to 1 to try to use unbuffered memory (default 0)");
+
+static int dump_oops = 1;
+module_param(dump_oops, int, 0600);
+MODULE_PARM_DESC(dump_oops,
+ "set to 1 to dump oopses, 0 to only dump panics (default 1)");
+
+static int ramoops_ecc;
+module_param_named(ecc, ramoops_ecc, int, 0600);
+MODULE_PARM_DESC(ramoops_ecc,
+ "if non-zero, the option enables ECC support and specifies "
+ "ECC buffer size in bytes (1 is a special value, means 16 "
+ "bytes ECC)");
+
+struct ramoops_context {
+ struct persistent_ram_zone **dprzs; /* Oops dump zones */
+ struct persistent_ram_zone *cprz; /* Console zone */
+ struct persistent_ram_zone **fprzs; /* Ftrace zones */
+ struct persistent_ram_zone *mprz; /* PMSG zone */
+#ifdef CONFIG_MTK_RAM_CONSOLE
+ struct persistent_ram_zone *bprz; /* AEE lockless console zone */
+#endif
+ phys_addr_t phys_addr;
+ unsigned long size;
+ unsigned int memtype;
+ size_t record_size;
+ size_t console_size;
+ size_t ftrace_size;
+ size_t pmsg_size;
+ int dump_oops;
+ u32 flags;
+ struct persistent_ram_ecc_info ecc_info;
+ unsigned int max_dump_cnt;
+ unsigned int dump_write_cnt;
+ /* _read_cnt need clear on ramoops_pstore_open */
+ unsigned int dump_read_cnt;
+ unsigned int console_read_cnt;
+ unsigned int max_ftrace_cnt;
+ unsigned int ftrace_read_cnt;
+ unsigned int pmsg_read_cnt;
+#ifdef CONFIG_MTK_RAM_CONSOLE
+ unsigned int bconsole_read_cnt;
+#endif
+ struct pstore_info pstore;
+};
+
+static struct platform_device *dummy;
+static struct ramoops_platform_data *dummy_data;
+
+static int ramoops_pstore_open(struct pstore_info *psi)
+{
+ struct ramoops_context *cxt = psi->data;
+
+ cxt->dump_read_cnt = 0;
+ cxt->console_read_cnt = 0;
+ cxt->ftrace_read_cnt = 0;
+ cxt->pmsg_read_cnt = 0;
+#ifdef CONFIG_MTK_RAM_CONSOLE
+ cxt->bconsole_read_cnt = 0;
+#endif
+ return 0;
+}
+
+static struct persistent_ram_zone *
+ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
+ u64 *id,
+ enum pstore_type_id *typep, enum pstore_type_id type,
+ bool update)
+{
+ struct persistent_ram_zone *prz;
+ int i = (*c)++;
+
+ /* Give up if we never existed or have hit the end. */
+ if (!przs || i >= max)
+ return NULL;
+
+ prz = przs[i];
+ if (!prz)
+ return NULL;
+
+ /* Update old/shadowed buffer. */
+ if (update)
+ persistent_ram_save_old(prz);
+
+ if (!persistent_ram_old_size(prz))
+ return NULL;
+
+ *typep = type;
+ *id = i;
+
+ return prz;
+}
+
+static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time,
+ bool *compressed)
+{
+ char data_type;
+ int header_length = 0;
+
+ if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec,
+ &time->tv_nsec, &data_type, &header_length) == 3) {
+ if (data_type == 'C')
+ *compressed = true;
+ else
+ *compressed = false;
+ } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n",
+ &time->tv_sec, &time->tv_nsec, &header_length) == 2) {
+ *compressed = false;
+ } else {
+ time->tv_sec = 0;
+ time->tv_nsec = 0;
+ *compressed = false;
+ }
+ return header_length;
+}
+
+static bool prz_ok(struct persistent_ram_zone *prz)
+{
+ return !!prz && !!(persistent_ram_old_size(prz) +
+ persistent_ram_ecc_string(prz, NULL, 0));
+}
+
+static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest,
+ struct persistent_ram_zone *src)
+{
+ size_t dest_size, src_size, total, dest_off, src_off;
+ size_t dest_idx = 0, src_idx = 0, merged_idx = 0;
+ void *merged_buf;
+ struct pstore_ftrace_record *drec, *srec, *mrec;
+ size_t record_size = sizeof(struct pstore_ftrace_record);
+
+ dest_off = dest->old_log_size % record_size;
+ dest_size = dest->old_log_size - dest_off;
+
+ src_off = src->old_log_size % record_size;
+ src_size = src->old_log_size - src_off;
+
+ total = dest_size + src_size;
+ merged_buf = kmalloc(total, GFP_KERNEL);
+ if (!merged_buf)
+ return -ENOMEM;
+
+ drec = (struct pstore_ftrace_record *)(dest->old_log + dest_off);
+ srec = (struct pstore_ftrace_record *)(src->old_log + src_off);
+ mrec = (struct pstore_ftrace_record *)(merged_buf);
+
+ while (dest_size > 0 && src_size > 0) {
+ if (pstore_ftrace_read_timestamp(&drec[dest_idx]) <
+ pstore_ftrace_read_timestamp(&srec[src_idx])) {
+ mrec[merged_idx++] = drec[dest_idx++];
+ dest_size -= record_size;
+ } else {
+ mrec[merged_idx++] = srec[src_idx++];
+ src_size -= record_size;
+ }
+ }
+
+ while (dest_size > 0) {
+ mrec[merged_idx++] = drec[dest_idx++];
+ dest_size -= record_size;
+ }
+
+ while (src_size > 0) {
+ mrec[merged_idx++] = srec[src_idx++];
+ src_size -= record_size;
+ }
+
+ kfree(dest->old_log);
+ dest->old_log = merged_buf;
+ dest->old_log_size = total;
+
+ return 0;
+}
+
+static ssize_t ramoops_pstore_read(struct pstore_record *record)
+{
+ ssize_t size = 0;
+ struct ramoops_context *cxt = record->psi->data;
+ struct persistent_ram_zone *prz = NULL;
+ int header_length = 0;
+ bool free_prz = false;
+
+ /*
+ * Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
+ * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have
+ * valid time stamps, so it is initialized to zero.
+ */
+ record->time.tv_sec = 0;
+ record->time.tv_nsec = 0;
+ record->compressed = false;
+
+ /* Find the next valid persistent_ram_zone for DMESG */
+ while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) {
+ prz = ramoops_get_next_prz(cxt->dprzs, &cxt->dump_read_cnt,
+ cxt->max_dump_cnt, &record->id,
+ &record->type,
+ PSTORE_TYPE_DMESG, 1);
+ if (!prz_ok(prz))
+ continue;
+ header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz),
+ &record->time,
+ &record->compressed);
+ /* Clear and skip this DMESG record if it has no valid header */
+ if (!header_length) {
+ persistent_ram_free_old(prz);
+ persistent_ram_zap(prz);
+ prz = NULL;
+ }
+ }
+
+ if (!prz_ok(prz))
+ prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
+ 1, &record->id, &record->type,
+ PSTORE_TYPE_CONSOLE, 0);
+#ifdef CONFIG_MTK_RAM_CONSOLE
+ if (!prz_ok(prz)) {
+ prz = ramoops_get_next_prz(&cxt->bprz, &cxt->bconsole_read_cnt,
+ 1, &record->id, &record->type,
+ PSTORE_TYPE_CONSOLE, 0);
+ record->id = 2;
+ }
+#endif
+ if (!prz_ok(prz))
+ prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
+ 1, &record->id, &record->type,
+ PSTORE_TYPE_PMSG, 0);
+
+ /* ftrace is last since it may want to dynamically allocate memory. */
+ if (!prz_ok(prz)) {
+ if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)) {
+ prz = ramoops_get_next_prz(cxt->fprzs,
+ &cxt->ftrace_read_cnt, 1, &record->id,
+ &record->type, PSTORE_TYPE_FTRACE, 0);
+ } else {
+ /*
+ * Build a new dummy record which combines all the
+ * per-cpu records including metadata and ecc info.
+ */
+ struct persistent_ram_zone *tmp_prz, *prz_next;
+
+ tmp_prz = kzalloc(sizeof(struct persistent_ram_zone),
+ GFP_KERNEL);
+ if (!tmp_prz)
+ return -ENOMEM;
+ prz = tmp_prz;
+ free_prz = true;
+
+ while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) {
+ prz_next = ramoops_get_next_prz(cxt->fprzs,
+ &cxt->ftrace_read_cnt,
+ cxt->max_ftrace_cnt,
+ &record->id,
+ &record->type,
+ PSTORE_TYPE_FTRACE, 0);
+
+ if (!prz_ok(prz_next))
+ continue;
+
+ tmp_prz->ecc_info = prz_next->ecc_info;
+ tmp_prz->corrected_bytes +=
+ prz_next->corrected_bytes;
+ tmp_prz->bad_blocks += prz_next->bad_blocks;
+ size = ftrace_log_combine(tmp_prz, prz_next);
+ if (size)
+ goto out;
+ }
+ record->id = 0;
+ }
+ }
+
+ if (!prz_ok(prz)) {
+ size = 0;
+ goto out;
+ }
+
+ size = persistent_ram_old_size(prz) - header_length;
+
+ /* ECC correction notice */
+ record->ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
+
+ record->buf = kmalloc(size + record->ecc_notice_size + 1, GFP_KERNEL);
+ if (record->buf == NULL) {
+ size = -ENOMEM;
+ goto out;
+ }
+
+ memcpy(record->buf, (char *)persistent_ram_old(prz) + header_length,
+ size);
+
+ persistent_ram_ecc_string(prz, record->buf + size,
+ record->ecc_notice_size + 1);
+
+out:
+ if (free_prz) {
+ kfree(prz->old_log);
+ kfree(prz);
+ }
+
+ return size;
+}
+
+static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
+ struct pstore_record *record)
+{
+ char *hdr;
+ size_t len;
+
+ hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
+ record->time.tv_sec,
+ record->time.tv_nsec / 1000,
+ record->compressed ? 'C' : 'D');
+ WARN_ON_ONCE(!hdr);
+ len = hdr ? strlen(hdr) : 0;
+ persistent_ram_write(prz, hdr, len);
+ kfree(hdr);
+
+ return len;
+}
+
+static int notrace ramoops_pstore_write(struct pstore_record *record)
+{
+ struct ramoops_context *cxt = record->psi->data;
+ struct persistent_ram_zone *prz;
+ size_t size, hlen;
+
+ if (record->type == PSTORE_TYPE_CONSOLE) {
+#ifdef CONFIG_MTK_RAM_CONSOLE
+ if (record->reason == 0) {
+ if (!cxt->cprz)
+ return -ENOMEM;
+ persistent_ram_write(cxt->cprz, record->buf,
+ record->size);
+ } else {
+ if (!cxt->bprz)
+ return -ENOMEM;
+ persistent_ram_write(cxt->bprz, record->buf,
+ record->size);
+ }
+#else
+ if (!cxt->cprz)
+ return -ENOMEM;
+ persistent_ram_write(cxt->cprz, record->buf, record->size);
+#endif
+ return 0;
+ } else if (record->type == PSTORE_TYPE_FTRACE) {
+ int zonenum;
+
+ if (!cxt->fprzs)
+ return -ENOMEM;
+ /*
+ * Choose zone by if we're using per-cpu buffers.
+ */
+ if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
+ zonenum = smp_processor_id();
+ else
+ zonenum = 0;
+
+ persistent_ram_write(cxt->fprzs[zonenum], record->buf,
+ record->size);
+ return 0;
+ } else if (record->type == PSTORE_TYPE_PMSG) {
+ pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__);
+ return -EINVAL;
+ }
+
+ if (record->type != PSTORE_TYPE_DMESG)
+ return -EINVAL;
+
+ /*
+ * Out of the various dmesg dump types, ramoops is currently designed
+ * to only store crash logs, rather than storing general kernel logs.
+ */
+ if (record->reason != KMSG_DUMP_OOPS &&
+ record->reason != KMSG_DUMP_PANIC)
+ return -EINVAL;
+
+ /* Skip Oopes when configured to do so. */
+ if (record->reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
+ return -EINVAL;
+
+ /*
+ * Explicitly only take the first part of any new crash.
+ * If our buffer is larger than kmsg_bytes, this can never happen,
+ * and if our buffer is smaller than kmsg_bytes, we don't want the
+ * report split across multiple records.
+ */
+ if (record->part != 1)
+ return -ENOSPC;
+
+ if (!cxt->dprzs)
+ return -ENOSPC;
+
+ prz = cxt->dprzs[cxt->dump_write_cnt];
+
+ /*
+ * Since this is a new crash dump, we need to reset the buffer in
+ * case it still has an old dump present. Without this, the new dump
+ * will get appended, which would seriously confuse anything trying
+ * to check dump file contents. Specifically, ramoops_read_kmsg_hdr()
+ * expects to find a dump header in the beginning of buffer data, so
+ * we must to reset the buffer values, in order to ensure that the
+ * header will be written to the beginning of the buffer.
+ */
+ persistent_ram_zap(prz);
+
+ /* Build header and append record contents. */
+ hlen = ramoops_write_kmsg_hdr(prz, record);
+ size = record->size;
+ if (size + hlen > prz->buffer_size)
+ size = prz->buffer_size - hlen;
+ persistent_ram_write(prz, record->buf, size);
+
+ cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;
+
+ return 0;
+}
+
+static int notrace ramoops_pstore_write_user(struct pstore_record *record,
+ const char __user *buf)
+{
+ if (record->type == PSTORE_TYPE_PMSG) {
+ struct ramoops_context *cxt = record->psi->data;
+
+ if (!cxt->mprz)
+ return -ENOMEM;
+ return persistent_ram_write_user(cxt->mprz, buf, record->size);
+ }
+
+ return -EINVAL;
+}
+
+static int ramoops_pstore_erase(struct pstore_record *record)
+{
+ struct ramoops_context *cxt = record->psi->data;
+ struct persistent_ram_zone *prz;
+
+ switch (record->type) {
+ case PSTORE_TYPE_DMESG:
+ if (record->id >= cxt->max_dump_cnt)
+ return -EINVAL;
+ prz = cxt->dprzs[record->id];
+ break;
+ case PSTORE_TYPE_CONSOLE:
+ prz = cxt->cprz;
+ break;
+ case PSTORE_TYPE_FTRACE:
+ if (record->id >= cxt->max_ftrace_cnt)
+ return -EINVAL;
+ prz = cxt->fprzs[record->id];
+ break;
+ case PSTORE_TYPE_PMSG:
+ prz = cxt->mprz;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ persistent_ram_free_old(prz);
+ persistent_ram_zap(prz);
+
+ return 0;
+}
+
+static struct ramoops_context oops_cxt = {
+ .pstore = {
+ .owner = THIS_MODULE,
+ .name = "ramoops",
+ .open = ramoops_pstore_open,
+ .read = ramoops_pstore_read,
+ .write = ramoops_pstore_write,
+ .write_user = ramoops_pstore_write_user,
+ .erase = ramoops_pstore_erase,
+ },
+};
+
+static void ramoops_free_przs(struct ramoops_context *cxt)
+{
+ int i;
+
+ /* Free dump PRZs */
+ if (cxt->dprzs) {
+ for (i = 0; i < cxt->max_dump_cnt; i++)
+ persistent_ram_free(cxt->dprzs[i]);
+
+ kfree(cxt->dprzs);
+ cxt->max_dump_cnt = 0;
+ }
+
+ /* Free ftrace PRZs */
+ if (cxt->fprzs) {
+ for (i = 0; i < cxt->max_ftrace_cnt; i++)
+ persistent_ram_free(cxt->fprzs[i]);
+ kfree(cxt->fprzs);
+ cxt->max_ftrace_cnt = 0;
+ }
+}
+
+static int ramoops_init_przs(const char *name,
+ struct device *dev, struct ramoops_context *cxt,
+ struct persistent_ram_zone ***przs,
+ phys_addr_t *paddr, size_t mem_sz,
+ ssize_t record_size,
+ unsigned int *cnt, u32 sig, u32 flags)
+{
+ int err = -ENOMEM;
+ int i;
+ size_t zone_sz;
+ struct persistent_ram_zone **prz_ar;
+
+ /* Allocate nothing for 0 mem_sz or 0 record_size. */
+ if (mem_sz == 0 || record_size == 0) {
+ *cnt = 0;
+ return 0;
+ }
+
+ /*
+ * If we have a negative record size, calculate it based on
+ * mem_sz / *cnt. If we have a positive record size, calculate
+ * cnt from mem_sz / record_size.
+ */
+ if (record_size < 0) {
+ if (*cnt == 0)
+ return 0;
+ record_size = mem_sz / *cnt;
+ if (record_size == 0) {
+ dev_err(dev, "%s record size == 0 (%zu / %u)\n",
+ name, mem_sz, *cnt);
+ goto fail;
+ }
+ } else {
+ *cnt = mem_sz / record_size;
+ if (*cnt == 0) {
+ dev_err(dev, "%s record count == 0 (%zu / %zu)\n",
+ name, mem_sz, record_size);
+ goto fail;
+ }
+ }
+
+ if (*paddr + mem_sz - cxt->phys_addr > cxt->size) {
+ dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
+ name,
+ mem_sz, (unsigned long long)*paddr,
+ cxt->size, (unsigned long long)cxt->phys_addr);
+ goto fail;
+ }
+
+ zone_sz = mem_sz / *cnt;
+ if (!zone_sz) {
+ dev_err(dev, "%s zone size == 0\n", name);
+ goto fail;
+ }
+
+ prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL);
+ if (!prz_ar)
+ goto fail;
+
+ for (i = 0; i < *cnt; i++) {
+ prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig,
+ &cxt->ecc_info,
+ cxt->memtype, flags);
+ if (IS_ERR(prz_ar[i])) {
+ err = PTR_ERR(prz_ar[i]);
+ dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
+ name, record_size,
+ (unsigned long long)*paddr, err);
+
+ while (i > 0) {
+ i--;
+ persistent_ram_free(prz_ar[i]);
+ }
+ kfree(prz_ar);
+ goto fail;
+ }
+ *paddr += zone_sz;
+ }
+
+ *przs = prz_ar;
+ return 0;
+
+fail:
+ *cnt = 0;
+ return err;
+}
+
+static int ramoops_init_prz(const char *name,
+ struct device *dev, struct ramoops_context *cxt,
+ struct persistent_ram_zone **prz,
+ phys_addr_t *paddr, size_t sz, u32 sig)
+{
+ if (!sz)
+ return 0;
+
+ if (*paddr + sz - cxt->phys_addr > cxt->size) {
+ dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
+ name, sz, (unsigned long long)*paddr,
+ cxt->size, (unsigned long long)cxt->phys_addr);
+ return -ENOMEM;
+ }
+
+ *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info,
+ cxt->memtype, 0);
+ if (IS_ERR(*prz)) {
+ int err = PTR_ERR(*prz);
+
+ dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
+ name, sz, (unsigned long long)*paddr, err);
+ return err;
+ }
+
+ persistent_ram_zap(*prz);
+
+ *paddr += sz;
+
+ return 0;
+}
+
+static int ramoops_parse_dt_size(struct platform_device *pdev,
+ const char *propname, u32 *value)
+{
+ u32 val32 = 0;
+ int ret;
+
+ ret = of_property_read_u32(pdev->dev.of_node, propname, &val32);
+ if (ret < 0 && ret != -EINVAL) {
+ dev_err(&pdev->dev, "failed to parse property %s: %d\n",
+ propname, ret);
+ return ret;
+ }
+
+ if (val32 > INT_MAX) {
+ dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32);
+ return -EOVERFLOW;
+ }
+
+ *value = val32;
+ return 0;
+}
+
+static int ramoops_parse_dt(struct platform_device *pdev,
+ struct ramoops_platform_data *pdata)
+{
+ struct device_node *of_node = pdev->dev.of_node;
+ struct resource *res;
+ u32 value;
+ int ret;
+
+ dev_dbg(&pdev->dev, "using Device Tree\n");
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev,
+ "failed to locate DT /reserved-memory resource\n");
+ return -EINVAL;
+ }
+
+ pdata->mem_size = resource_size(res);
+ pdata->mem_address = res->start;
+ pdata->mem_type = of_property_read_bool(of_node, "unbuffered");
+ pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops");
+
+#define parse_size(name, field) { \
+ ret = ramoops_parse_dt_size(pdev, name, &value); \
+ if (ret < 0) \
+ return ret; \
+ field = value; \
+ }
+
+ parse_size("record-size", pdata->record_size);
+ parse_size("console-size", pdata->console_size);
+ parse_size("ftrace-size", pdata->ftrace_size);
+ parse_size("pmsg-size", pdata->pmsg_size);
+ parse_size("ecc-size", pdata->ecc_info.ecc_size);
+ parse_size("flags", pdata->flags);
+
+#undef parse_size
+
+ return 0;
+}
+
+void notrace ramoops_console_write_buf(const char *buf, size_t size)
+{
+ struct ramoops_context *cxt = &oops_cxt;
+ persistent_ram_write(cxt->cprz, buf, size);
+}
+
+static int ramoops_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct ramoops_platform_data *pdata = dev->platform_data;
+ struct ramoops_platform_data pdata_local;
+ struct ramoops_context *cxt = &oops_cxt;
+ size_t dump_mem_sz;
+ phys_addr_t paddr;
+ int err = -EINVAL;
+
+ if (dev_of_node(dev) && !pdata) {
+ pdata = &pdata_local;
+ memset(pdata, 0, sizeof(*pdata));
+
+ err = ramoops_parse_dt(pdev, pdata);
+ if (err < 0)
+ goto fail_out;
+ }
+
+ /*
+ * Only a single ramoops area allowed at a time, so fail extra
+ * probes.
+ */
+ if (cxt->max_dump_cnt) {
+ pr_err("already initialized\n");
+ goto fail_out;
+ }
+
+ /* Make sure we didn't get bogus platform data pointer. */
+ if (!pdata) {
+ pr_err("NULL platform data\n");
+ goto fail_out;
+ }
+
+ if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
+ !pdata->ftrace_size && !pdata->pmsg_size)) {
+ pr_err("The memory size and the record/console size must be "
+ "non-zero\n");
+ goto fail_out;
+ }
+
+ if (pdata->record_size && !is_power_of_2(pdata->record_size))
+ pdata->record_size = rounddown_pow_of_two(pdata->record_size);
+ if (pdata->console_size && !is_power_of_2(pdata->console_size))
+ pdata->console_size = rounddown_pow_of_two(pdata->console_size);
+ if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
+ pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
+ if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
+ pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
+
+ cxt->size = pdata->mem_size;
+ cxt->phys_addr = pdata->mem_address;
+ cxt->memtype = pdata->mem_type;
+ cxt->record_size = pdata->record_size;
+ cxt->console_size = pdata->console_size;
+ cxt->ftrace_size = pdata->ftrace_size;
+ cxt->pmsg_size = pdata->pmsg_size;
+ cxt->dump_oops = pdata->dump_oops;
+ cxt->flags = pdata->flags;
+ cxt->ecc_info = pdata->ecc_info;
+
+#ifdef CONFIG_MTK_RAM_CONSOLE
+ pr_notice("pstore:address is 0x%lx, size is 0x%lx, console_size is 0x%zx, pmsg_size is 0x%zx\n",
+ (unsigned long)cxt->phys_addr, cxt->size,
+ cxt->console_size, cxt->pmsg_size);
+#endif
+ paddr = cxt->phys_addr;
+
+#ifdef CONFIG_MTK_RAM_CONSOLE
+ dump_mem_sz = cxt->size - cxt->console_size * 2 - cxt->ftrace_size
+ - cxt->pmsg_size;
+#else
+ dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
+ - cxt->pmsg_size;
+#endif
+ err = ramoops_init_przs("dump", dev, cxt, &cxt->dprzs, &paddr,
+ dump_mem_sz, cxt->record_size,
+ &cxt->max_dump_cnt, 0, 0);
+ if (err)
+ goto fail_out;
+
+ err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr,
+ cxt->console_size, 0);
+ if (err)
+ goto fail_init_cprz;
+
+#ifdef CONFIG_MTK_RAM_CONSOLE
+ err = ramoops_init_prz("bconsole", dev, cxt, &cxt->bprz, &paddr,
+ cxt->console_size, 0);
+ if (err)
+ goto fail_init_bprz;
+#endif
+ cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
+ ? nr_cpu_ids
+ : 1;
+ err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr,
+ cxt->ftrace_size, -1,
+ &cxt->max_ftrace_cnt, LINUX_VERSION_CODE,
+ (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
+ ? PRZ_FLAG_NO_LOCK : 0);
+ if (err)
+ goto fail_init_fprz;
+
+ err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr,
+ cxt->pmsg_size, 0);
+ if (err)
+ goto fail_init_mprz;
+
+ cxt->pstore.data = cxt;
+ /*
+ * Prepare frontend flags based on which areas are initialized.
+ * For ramoops_init_przs() cases, the "max count" variable tells
+ * if there are regions present. For ramoops_init_prz() cases,
+ * the single region size is how to check.
+ */
+ cxt->pstore.flags = 0;
+ if (cxt->max_dump_cnt)
+ cxt->pstore.flags |= PSTORE_FLAGS_DMESG;
+ if (cxt->console_size)
+ cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
+ if (cxt->max_ftrace_cnt)
+ cxt->pstore.flags |= PSTORE_FLAGS_FTRACE;
+ if (cxt->pmsg_size)
+ cxt->pstore.flags |= PSTORE_FLAGS_PMSG;
+
+ /*
+ * Since bufsize is only used for dmesg crash dumps, it
+ * must match the size of the dprz record (after PRZ header
+ * and ECC bytes have been accounted for).
+ */
+ if (cxt->pstore.flags & PSTORE_FLAGS_DMESG) {
+ cxt->pstore.bufsize = cxt->dprzs[0]->buffer_size;
+ cxt->pstore.buf = kzalloc(cxt->pstore.bufsize, GFP_KERNEL);
+ if (!cxt->pstore.buf) {
+ pr_err("cannot allocate pstore crash dump buffer\n");
+ err = -ENOMEM;
+ goto fail_clear;
+ }
+ }
+
+ err = pstore_register(&cxt->pstore);
+ if (err) {
+ pr_err("registering with pstore failed\n");
+ goto fail_buf;
+ }
+
+ /*
+ * Update the module parameter variables as well so they are visible
+ * through /sys/module/ramoops/parameters/
+ */
+ mem_size = pdata->mem_size;
+ mem_address = pdata->mem_address;
+ record_size = pdata->record_size;
+ dump_oops = pdata->dump_oops;
+ ramoops_console_size = pdata->console_size;
+ ramoops_pmsg_size = pdata->pmsg_size;
+ ramoops_ftrace_size = pdata->ftrace_size;
+
+ pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
+ cxt->size, (unsigned long long)cxt->phys_addr,
+ cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
+
+ return 0;
+
+fail_buf:
+ kfree(cxt->pstore.buf);
+fail_clear:
+ cxt->pstore.bufsize = 0;
+ persistent_ram_free(cxt->mprz);
+fail_init_mprz:
+fail_init_fprz:
+#ifdef CONFIG_MTK_RAM_CONSOLE
+ persistent_ram_free(cxt->bprz);
+fail_init_bprz:
+#endif
+ persistent_ram_free(cxt->cprz);
+fail_init_cprz:
+ ramoops_free_przs(cxt);
+fail_out:
+ return err;
+}
+
+static int ramoops_remove(struct platform_device *pdev)
+{
+ struct ramoops_context *cxt = &oops_cxt;
+
+ pstore_unregister(&cxt->pstore);
+
+ kfree(cxt->pstore.buf);
+ cxt->pstore.bufsize = 0;
+
+ persistent_ram_free(cxt->mprz);
+ persistent_ram_free(cxt->cprz);
+ ramoops_free_przs(cxt);
+
+ return 0;
+}
+
+static const struct of_device_id dt_match[] = {
+ { .compatible = "ramoops" },
+ {}
+};
+
+static struct platform_driver ramoops_driver = {
+ .probe = ramoops_probe,
+ .remove = ramoops_remove,
+ .driver = {
+ .name = "ramoops",
+ .of_match_table = dt_match,
+ },
+};
+
+static void ramoops_register_dummy(void)
+{
+ if (!mem_size)
+ return;
+
+ pr_info("using module parameters\n");
+
+ dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
+ if (!dummy_data) {
+ pr_info("could not allocate pdata\n");
+ return;
+ }
+
+ dummy_data->mem_size = mem_size;
+ dummy_data->mem_address = mem_address;
+ dummy_data->mem_type = mem_type;
+ dummy_data->record_size = record_size;
+ dummy_data->console_size = ramoops_console_size;
+ dummy_data->ftrace_size = ramoops_ftrace_size;
+ dummy_data->pmsg_size = ramoops_pmsg_size;
+ dummy_data->dump_oops = dump_oops;
+ dummy_data->flags = RAMOOPS_FLAG_FTRACE_PER_CPU;
+
+ /*
+ * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
+ * (using 1 byte for ECC isn't much of use anyway).
+ */
+ dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
+
+ dummy = platform_device_register_data(NULL, "ramoops", -1,
+ dummy_data, sizeof(struct ramoops_platform_data));
+ if (IS_ERR(dummy)) {
+ pr_info("could not create platform device: %ld\n",
+ PTR_ERR(dummy));
+ }
+}
+
+static int __init ramoops_init(void)
+{
+ ramoops_register_dummy();
+ return platform_driver_register(&ramoops_driver);
+}
+postcore_initcall(ramoops_init);
+
+static void __exit ramoops_exit(void)
+{
+ platform_driver_unregister(&ramoops_driver);
+ platform_device_unregister(dummy);
+ kfree(dummy_data);
+}
+module_exit(ramoops_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
+MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");