From b5d38e9bf1b0c4db19e336b59b38dfb5d28bf1bf Mon Sep 17 00:00:00 2001 From: Anton Vorontsov Date: Sat, 26 May 2012 06:20:23 -0700 Subject: 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 /console-ramoops file. Signed-off-by: Anton Vorontsov Acked-by: Kees Cook Signed-off-by: Greg Kroah-Hartman --- fs/pstore/ram.c | 100 ++++++++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 86 insertions(+), 14 deletions(-) (limited to 'fs/pstore/ram.c') diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c index d770d7266e96..c7acf94ff475 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; } @@ -124,6 +132,9 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt, 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; @@ -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@0x%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@0x%llx (%ux0x%zx), ecc: %s\n", + pr_info("attached 0x%lx@0x%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, -- cgit v1.2.3