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Date: Sat, 26 May 2012 06:20:23 -0700
From: Anton Vorontsov <anton.vorontsov@...aro.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Kees Cook <keescook@...omium.org>,
Colin Cross <ccross@...roid.com>,
Tony Luck <tony.luck@...el.com>
Cc: Arnd Bergmann <arnd@...db.de>,
John Stultz <john.stultz@...aro.org>,
Shuah Khan <shuahkhan@...il.com>, arve@...roid.com,
Rebecca Schultz Zavin <rebecca@...roid.com>,
Jesper Juhl <jj@...osbits.net>,
Randy Dunlap <rdunlap@...otime.net>,
Stephen Boyd <sboyd@...eaurora.org>,
Thomas Meyer <thomas@...3r.de>,
Andrew Morton <akpm@...ux-foundation.org>,
Marco Stornelli <marco.stornelli@...il.com>,
WANG Cong <xiyou.wangcong@...il.com>,
linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
linaro-kernel@...ts.linaro.org, patches@...aro.org,
kernel-team@...roid.com
Subject: [PATCH 05/11] pstore/ram: Add console messages handling
The console log size is configurable via ramoops.console_size
module option, and the log itself is available via
<pstore-mount>/console-ramoops file.
Signed-off-by: Anton Vorontsov <anton.vorontsov@...aro.org>
Acked-by: Kees Cook <keescook@...omium.org>
---
fs/pstore/ram.c | 100 +++++++++++++++++++++++++++++++++++++-------
include/linux/pstore_ram.h | 1 +
2 files changed, 87 insertions(+), 14 deletions(-)
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index d770d72..c7acf94 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -41,6 +41,10 @@ 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 mem_address;
module_param(mem_address, ulong, 0400);
MODULE_PARM_DESC(mem_address,
@@ -63,14 +67,17 @@ MODULE_PARM_DESC(ramoops_ecc,
struct ramoops_context {
struct persistent_ram_zone **przs;
+ struct persistent_ram_zone *cprz;
phys_addr_t phys_addr;
unsigned long size;
size_t record_size;
+ size_t console_size;
int dump_oops;
bool ecc;
unsigned int max_dump_cnt;
unsigned int dump_write_cnt;
unsigned int dump_read_cnt;
+ unsigned int console_read_cnt;
struct pstore_info pstore;
};
@@ -82,6 +89,7 @@ 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;
return 0;
}
@@ -125,6 +133,9 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
cxt->max_dump_cnt, id, type,
PSTORE_TYPE_DMESG, 1);
if (!prz)
+ prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
+ 1, id, type, PSTORE_TYPE_CONSOLE, 0);
+ if (!prz)
return 0;
/* TODO(kees): Bogus time for the moment. */
@@ -167,7 +178,13 @@ static int ramoops_pstore_write(enum pstore_type_id type,
struct persistent_ram_zone *prz = cxt->przs[cxt->dump_write_cnt];
size_t hlen;
- /* Currently ramoops is designed to only store dmesg dumps. */
+ if (type == PSTORE_TYPE_CONSOLE) {
+ if (!cxt->cprz)
+ return -ENOMEM;
+ persistent_ram_write(cxt->cprz, cxt->pstore.buf, size);
+ return 0;
+ }
+
if (type != PSTORE_TYPE_DMESG)
return -EINVAL;
@@ -204,12 +221,23 @@ static int ramoops_pstore_erase(enum pstore_type_id type, u64 id,
struct pstore_info *psi)
{
struct ramoops_context *cxt = psi->data;
+ struct persistent_ram_zone *prz;
- if (id >= cxt->max_dump_cnt)
+ switch (type) {
+ case PSTORE_TYPE_DMESG:
+ if (id >= cxt->max_dump_cnt)
+ return -EINVAL;
+ prz = cxt->przs[id];
+ break;
+ case PSTORE_TYPE_CONSOLE:
+ prz = cxt->cprz;
+ break;
+ default:
return -EINVAL;
+ }
- persistent_ram_free_old(cxt->przs[id]);
- persistent_ram_zap(cxt->przs[id]);
+ persistent_ram_free_old(prz);
+ persistent_ram_zap(prz);
return 0;
}
@@ -276,6 +304,32 @@ fail_prz:
return err;
}
+static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt,
+ struct persistent_ram_zone **prz,
+ phys_addr_t *paddr, size_t sz)
+{
+ if (!sz)
+ return 0;
+
+ if (*paddr + sz > *paddr + cxt->size)
+ return -ENOMEM;
+
+ *prz = persistent_ram_new(*paddr, sz, cxt->ecc);
+ if (IS_ERR(*prz)) {
+ int err = PTR_ERR(*prz);
+
+ dev_err(dev, "failed to request mem region (0x%zx@...llx): %d\n",
+ sz, (unsigned long long)*paddr, err);
+ return err;
+ }
+
+ persistent_ram_zap(*prz);
+
+ *paddr += sz;
+
+ return 0;
+}
+
static int __init ramoops_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -291,34 +345,50 @@ static int __init ramoops_probe(struct platform_device *pdev)
if (cxt->max_dump_cnt)
goto fail_out;
- if (!pdata->mem_size || !pdata->record_size) {
- pr_err("The memory size and the record size must be "
+ if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size)) {
+ pr_err("The memory size and the record/console size must be "
"non-zero\n");
goto fail_out;
}
pdata->mem_size = rounddown_pow_of_two(pdata->mem_size);
pdata->record_size = rounddown_pow_of_two(pdata->record_size);
+ pdata->console_size = rounddown_pow_of_two(pdata->console_size);
cxt->dump_read_cnt = 0;
cxt->size = pdata->mem_size;
cxt->phys_addr = pdata->mem_address;
cxt->record_size = pdata->record_size;
+ cxt->console_size = pdata->console_size;
cxt->dump_oops = pdata->dump_oops;
cxt->ecc = pdata->ecc;
paddr = cxt->phys_addr;
- dump_mem_sz = cxt->size;
+ dump_mem_sz = cxt->size - cxt->console_size;
err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz);
- if (err) {
+ if (err)
+ goto fail_out;
+
+ err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr, cxt->console_size);
+ if (err)
+ goto fail_init_cprz;
+
+ if (!cxt->przs && !cxt->cprz) {
pr_err("memory size too small, minimum is %lu\n",
- cxt->record_size);
- goto fail_count;
+ cxt->console_size + cxt->record_size);
+ goto fail_cnt;
}
cxt->pstore.data = cxt;
- cxt->pstore.bufsize = cxt->przs[0]->buffer_size;
+ /*
+ * Console can handle any buffer size, so prefer dumps buffer
+ * size since usually it is smaller.
+ */
+ if (cxt->przs)
+ cxt->pstore.bufsize = cxt->przs[0]->buffer_size;
+ else
+ cxt->pstore.bufsize = cxt->cprz->buffer_size;
cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
spin_lock_init(&cxt->pstore.buf_lock);
if (!cxt->pstore.buf) {
@@ -341,9 +411,8 @@ static int __init ramoops_probe(struct platform_device *pdev)
record_size = pdata->record_size;
dump_oops = pdata->dump_oops;
- pr_info("attached 0x%lx@...llx (%ux0x%zx), ecc: %s\n",
+ pr_info("attached 0x%lx@...llx, ecc: %s\n",
cxt->size, (unsigned long long)cxt->phys_addr,
- cxt->max_dump_cnt, cxt->record_size,
ramoops_ecc ? "on" : "off");
return 0;
@@ -353,7 +422,9 @@ fail_buf:
fail_clear:
cxt->pstore.bufsize = 0;
cxt->max_dump_cnt = 0;
-fail_count:
+fail_cnt:
+ kfree(cxt->cprz);
+fail_init_cprz:
ramoops_free_przs(cxt);
fail_out:
return err;
@@ -405,6 +476,7 @@ static int __init ramoops_init(void)
dummy_data->mem_size = mem_size;
dummy_data->mem_address = mem_address;
dummy_data->record_size = record_size;
+ dummy_data->console_size = ramoops_console_size;
dummy_data->dump_oops = dump_oops;
dummy_data->ecc = ramoops_ecc;
dummy = platform_create_bundle(&ramoops_driver, ramoops_probe,
diff --git a/include/linux/pstore_ram.h b/include/linux/pstore_ram.h
index 3b823d4..9385d41 100644
--- a/include/linux/pstore_ram.h
+++ b/include/linux/pstore_ram.h
@@ -93,6 +93,7 @@ struct ramoops_platform_data {
unsigned long mem_size;
unsigned long mem_address;
unsigned long record_size;
+ unsigned long console_size;
int dump_oops;
bool ecc;
};
--
1.7.9.2
--
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