diff options
Diffstat (limited to 'drivers/char/ramoops.c')
| -rw-r--r-- | drivers/char/ramoops.c | 101 |
1 files changed, 78 insertions, 23 deletions
diff --git a/drivers/char/ramoops.c b/drivers/char/ramoops.c index 1a9f5f6d6ac5..810aff9e750f 100644 --- a/drivers/char/ramoops.c +++ b/drivers/char/ramoops.c @@ -19,18 +19,26 @@ * */ +#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); @@ -52,10 +60,15 @@ 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; } 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) @@ -74,13 +87,13 @@ static void ramoops_do_dump(struct kmsg_dumper *dumper, 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); @@ -88,8 +101,8 @@ 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; @@ -106,44 +119,59 @@ static int __init ramoops_probe(struct platform_device *pdev) 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; + /* + * 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; 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; } @@ -162,7 +190,7 @@ static int __exit ramoops_remove(struct platform_device *pdev) 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); @@ -179,12 +207,39 @@ static struct platform_driver ramoops_driver = { 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); |