*
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/kernel.h>
+#include <linux/err.h>
#include <linux/module.h>
#include <linux/kmsg_dump.h>
#include <linux/time.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
+#include <linux/slab.h>
#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);
void *virt_addr;
phys_addr_t phys_addr;
unsigned long size;
+ unsigned long record_size;
+ int dump_oops;
int count;
int max_count;
} oops_cxt;
+static struct platform_device *dummy;
+static struct ramoops_platform_data *dummy_data;
+
static void ramoops_do_dump(struct kmsg_dumper *dumper,
enum kmsg_dump_reason reason, const char *s1, unsigned long l1,
const char *s2, unsigned long l2)
return;
/* Only dump oopses if dump_oops is set */
- if (reason == KMSG_DUMP_OOPS && !dump_oops)
+ 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);
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;
struct ramoops_context *cxt = &oops_cxt;
int err = -EINVAL;
- if (pdata) {
- mem_size = pdata->mem_size;
- mem_address = pdata->mem_address;
+ if (!pdata->mem_size || !pdata->record_size) {
+ pr_err("The memory size and the record size must be "
+ "non-zero\n");
+ goto fail3;
}
- if (!mem_size) {
- printk(KERN_ERR "ramoops: invalid size specification");
+ rounddown_pow_of_two(pdata->mem_size);
+ rounddown_pow_of_two(pdata->record_size);
+
+ /* 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;
}
- rounddown_pow_of_two(mem_size);
-
- if (mem_size < RECORD_SIZE) {
- printk(KERN_ERR "ramoops: size too small");
+ 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 = mem_size / RECORD_SIZE;
+ cxt->max_count = pdata->mem_size / pdata->record_size;
cxt->count = 0;
- cxt->size = mem_size;
- cxt->phys_addr = mem_address;
+ 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")) {
- printk(KERN_ERR "ramoops: request mem region failed");
+ pr_err("request mem region failed\n");
err = -EINVAL;
goto fail3;
}
cxt->virt_addr = ioremap(cxt->phys_addr, cxt->size);
if (!cxt->virt_addr) {
- printk(KERN_ERR "ramoops: ioremap failed");
+ pr_err("ioremap failed\n");
goto fail2;
}
cxt->dump.dump = ramoops_do_dump;
err = kmsg_dump_register(&cxt->dump);
if (err) {
- printk(KERN_ERR "ramoops: registering kmsg dumper failed");
+ pr_err("registering kmsg dumper failed\n");
goto fail1;
}
struct ramoops_context *cxt = &oops_cxt;
if (kmsg_dump_unregister(&cxt->dump) < 0)
- printk(KERN_WARNING "ramoops: could not unregister kmsg_dumper");
+ pr_warn("could not unregister kmsg_dumper\n");
iounmap(cxt->virt_addr);
release_mem_region(cxt->phys_addr, cxt->size);
static int __init ramoops_init(void)
{
- return platform_driver_probe(&ramoops_driver, ramoops_probe);
+ int ret;
+ ret = platform_driver_probe(&ramoops_driver, ramoops_probe);
+ if (ret == -ENODEV) {
+ /*
+ * If we didn't find a platform device, we use module parameters
+ * building platform data on the fly.
+ */
+ pr_info("platform device not found, using module parameters\n");
+ dummy_data = kzalloc(sizeof(struct ramoops_platform_data),
+ GFP_KERNEL);
+ if (!dummy_data)
+ 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,
+ sizeof(struct ramoops_platform_data));
+
+ if (IS_ERR(dummy))
+ ret = PTR_ERR(dummy);
+ else
+ ret = 0;
+ }
+
+ return ret;
}
static void __exit ramoops_exit(void)
{
platform_driver_unregister(&ramoops_driver);
+ kfree(dummy_data);
}
module_init(ramoops_init);
git.openpandora.org / pandora-kernel.git / blobdiff