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authorSergiu Iordache <sergiu@chromium.org>2011-07-26 16:08:59 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-07-26 16:49:46 -0700
commit3e5c4fadb9943c7539364d0c8425db071a2020e4 (patch)
tree34f1d5c4cbf2f330e9fd1210da6dabde3befa6bf
parent6b4d2a2733b9a17112f746d498c9f9a0427dcdd8 (diff)
ramoops: make record_size a module parameter
The size of the dump is currently set using the RECORD_SIZE macro which is set to a page size. This patch makes the record size a module parameter and allows it to be set through platform data as well to allow larger dumps if needed. Signed-off-by: Sergiu Iordache <sergiu@chromium.org> Acked-by: Marco Stornelli <marco.stornelli@gmail.com> Cc: "Ahmed S. Darwish" <darwish.07@gmail.com> Cc: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/char/ramoops.c37
-rw-r--r--include/linux/ramoops.h1
2 files changed, 28 insertions, 10 deletions
diff --git a/drivers/char/ramoops.c b/drivers/char/ramoops.c
index 5349d94e17da..bd9b94b518f3 100644
--- a/drivers/char/ramoops.c
+++ b/drivers/char/ramoops.c
@@ -32,8 +32,12 @@
#include <linux/ramoops.h>
#define RAMOOPS_KERNMSG_HDR "===="
+#define MIN_MEM_SIZE 4096UL
-#define RECORD_SIZE 4096UL
+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 mem_address;
module_param(mem_address, ulong, 0400);
@@ -55,6 +59,7 @@ static struct ramoops_context {
void *virt_addr;
phys_addr_t phys_addr;
unsigned long size;
+ unsigned long record_size;
int dump_oops;
int count;
int max_count;
@@ -84,10 +89,10 @@ static void ramoops_do_dump(struct kmsg_dumper *dumper,
if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
return;
- buf = cxt->virt_addr + (cxt->count * RECORD_SIZE);
+ buf = cxt->virt_addr + (cxt->count * cxt->record_size);
buf_orig = buf;
- memset(buf, '\0', RECORD_SIZE);
+ memset(buf, '\0', cxt->record_size);
res = sprintf(buf, "%s", RAMOOPS_KERNMSG_HDR);
buf += res;
do_gettimeofday(&timestamp);
@@ -95,8 +100,8 @@ static void ramoops_do_dump(struct kmsg_dumper *dumper,
buf += res;
hdr_size = buf - buf_orig;
- l2_cpy = min(l2, RECORD_SIZE - hdr_size);
- l1_cpy = min(l1, RECORD_SIZE - hdr_size - l2_cpy);
+ l2_cpy = min(l2, cxt->record_size - hdr_size);
+ l1_cpy = min(l1, cxt->record_size - hdr_size - l2_cpy);
s2_start = l2 - l2_cpy;
s1_start = l1 - l1_cpy;
@@ -113,22 +118,33 @@ static int __init ramoops_probe(struct platform_device *pdev)
struct ramoops_context *cxt = &oops_cxt;
int err = -EINVAL;
- if (!pdata->mem_size) {
- pr_err("invalid size specification\n");
+ if (!pdata->mem_size || !pdata->record_size) {
+ pr_err("The memory size and the record size must be "
+ "non-zero\n");
goto fail3;
}
rounddown_pow_of_two(pdata->mem_size);
+ rounddown_pow_of_two(pdata->record_size);
- if (pdata->mem_size < RECORD_SIZE) {
- pr_err("size too small\n");
+ /* Check for the minimum memory size */
+ if (pdata->mem_size < MIN_MEM_SIZE &&
+ pdata->record_size < MIN_MEM_SIZE) {
+ pr_err("memory size too small, minium is %lu\n", MIN_MEM_SIZE);
goto fail3;
}
- cxt->max_count = pdata->mem_size / RECORD_SIZE;
+ if (pdata->mem_size < pdata->record_size) {
+ pr_err("The memory size must be larger than the "
+ "records size\n");
+ goto fail3;
+ }
+
+ cxt->max_count = pdata->mem_size / pdata->record_size;
cxt->count = 0;
cxt->size = pdata->mem_size;
cxt->phys_addr = pdata->mem_address;
+ cxt->record_size = pdata->record_size;
cxt->dump_oops = pdata->dump_oops;
if (!request_mem_region(cxt->phys_addr, cxt->size, "ramoops")) {
@@ -196,6 +212,7 @@ static int __init ramoops_init(void)
return -ENOMEM;
dummy_data->mem_size = mem_size;
dummy_data->mem_address = mem_address;
+ dummy_data->record_size = record_size;
dummy_data->dump_oops = dump_oops;
dummy = platform_create_bundle(&ramoops_driver, ramoops_probe,
NULL, 0, dummy_data,
diff --git a/include/linux/ramoops.h b/include/linux/ramoops.h
index 7105c4b3a24e..484fef81cd3a 100644
--- a/include/linux/ramoops.h
+++ b/include/linux/ramoops.h
@@ -10,6 +10,7 @@
struct ramoops_platform_data {
unsigned long mem_size;
unsigned long mem_address;
+ unsigned long record_size;
int dump_oops;
};

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