diff options
Diffstat (limited to 'drivers/char/ramoops.c')
| -rw-r--r-- | drivers/char/ramoops.c | 37 |
1 files changed, 27 insertions, 10 deletions
diff --git a/drivers/char/ramoops.c b/drivers/char/ramoops.c index 5349d94e17d..bd9b94b518f 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(×tamp); @@ -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, |