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pstore/ram: Switch to persistent_ram routines

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The patch switches pstore RAM backend to use persistent_ram routines,
one step closer to the ECC support.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Marco Stornelli <marco.stornelli@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anton Vorontsov 2012-05-17 00:15:18 -07:00 committed by Greg Kroah-Hartman
parent cddb8751c8
commit 896fc1f0c4
1 changed files with 59 additions and 47 deletions
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106
fs/pstore/ram.c
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@ -57,7 +57,7 @@ MODULE_PARM_DESC(dump_oops,
"set to 1 to dump oopses, 0 to only dump panics (default 1)");
struct ramoops_context {
void *virt_addr;
struct persistent_ram_zone **przs;
phys_addr_t phys_addr;
unsigned long size;
size_t record_size;
@ -85,39 +85,56 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
struct pstore_info *psi)
{
ssize_t size;
char *rambuf;
struct ramoops_context *cxt = psi->data;
struct persistent_ram_zone *prz;
if (cxt->read_count >= cxt->max_count)
return -EINVAL;
*id = cxt->read_count++;
prz = cxt->przs[*id];
/* Only supports dmesg output so far. */
*type = PSTORE_TYPE_DMESG;
/* TODO(kees): Bogus time for the moment. */
time->tv_sec = 0;
time->tv_nsec = 0;
rambuf = cxt->virt_addr + (*id * cxt->record_size);
size = strnlen(rambuf, cxt->record_size);
size = persistent_ram_old_size(prz);
*buf = kmalloc(size, GFP_KERNEL);
if (*buf == NULL)
return -ENOMEM;
memcpy(*buf, rambuf, size);
memcpy(*buf, persistent_ram_old(prz), size);
return size;
}
static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz)
{
char *hdr;
struct timeval timestamp;
size_t len;
do_gettimeofday(&timestamp);
hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu\n",
(long)timestamp.tv_sec, (long)timestamp.tv_usec);
WARN_ON_ONCE(!hdr);
len = hdr ? strlen(hdr) : 0;
persistent_ram_write(prz, hdr, len);
kfree(hdr);
return len;
}
static int ramoops_pstore_write(enum pstore_type_id type,
enum kmsg_dump_reason reason,
u64 *id,
unsigned int part,
size_t size, struct pstore_info *psi)
{
char *buf;
size_t res;
struct timeval timestamp;
struct ramoops_context *cxt = psi->data;
size_t available = cxt->record_size;
struct persistent_ram_zone *prz = cxt->przs[cxt->count];
size_t hlen;
/* Currently ramoops is designed to only store dmesg dumps. */
if (type != PSTORE_TYPE_DMESG)
@ -142,22 +159,10 @@ static int ramoops_pstore_write(enum pstore_type_id type,
if (part != 1)
return -ENOSPC;
buf = cxt->virt_addr + (cxt->count * cxt->record_size);
res = sprintf(buf, "%s", RAMOOPS_KERNMSG_HDR);
buf += res;
available -= res;
do_gettimeofday(&timestamp);
res = sprintf(buf, "%lu.%lu\n", (long)timestamp.tv_sec, (long)timestamp.tv_usec);
buf += res;
available -= res;
if (size > available)
size = available;
memcpy(buf, cxt->pstore.buf, size);
memset(buf + size, '\0', available - size);
hlen = ramoops_write_kmsg_hdr(prz);
if (size + hlen > prz->buffer_size)
size = prz->buffer_size - hlen;
persistent_ram_write(prz, cxt->pstore.buf, size);
cxt->count = (cxt->count + 1) % cxt->max_count;
@ -167,14 +172,12 @@ static int ramoops_pstore_write(enum pstore_type_id type,
static int ramoops_pstore_erase(enum pstore_type_id type, u64 id,
struct pstore_info *psi)
{
char *buf;
struct ramoops_context *cxt = psi->data;
if (id >= cxt->max_count)
return -EINVAL;
buf = cxt->virt_addr + (id * cxt->record_size);
memset(buf, '\0', cxt->record_size);
persistent_ram_free_old(cxt->przs[id]);
return 0;
}
@ -192,9 +195,11 @@ static struct ramoops_context oops_cxt = {
static int __init ramoops_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ramoops_platform_data *pdata = pdev->dev.platform_data;
struct ramoops_context *cxt = &oops_cxt;
int err = -EINVAL;
int i;
/* Only a single ramoops area allowed at a time, so fail extra
* probes.
@ -232,8 +237,28 @@ static int __init ramoops_probe(struct platform_device *pdev)
cxt->record_size = pdata->record_size;
cxt->dump_oops = pdata->dump_oops;
cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_count, GFP_KERNEL);
if (!cxt->przs) {
err = -ENOMEM;
dev_err(dev, "failed to initialize a prz array\n");
goto fail_out;
}
for (i = 0; i < cxt->max_count; i++) {
size_t sz = cxt->record_size;
phys_addr_t start = cxt->phys_addr + sz * i;
cxt->przs[i] = persistent_ram_new(start, sz, 0);
if (IS_ERR(cxt->przs[i])) {
err = PTR_ERR(cxt->przs[i]);
dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
sz, (unsigned long long)start, err);
goto fail_przs;
}
}
cxt->pstore.data = cxt;
cxt->pstore.bufsize = cxt->record_size;
cxt->pstore.bufsize = cxt->przs[0]->buffer_size;
cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
spin_lock_init(&cxt->pstore.buf_lock);
if (!cxt->pstore.buf) {
@ -241,23 +266,10 @@ static int __init ramoops_probe(struct platform_device *pdev)
goto fail_clear;
}
if (!request_mem_region(cxt->phys_addr, cxt->size, "ramoops")) {
pr_err("request mem region (0x%lx@0x%llx) failed\n",
cxt->size, (unsigned long long)cxt->phys_addr);
err = -EINVAL;
goto fail_buf;
}
cxt->virt_addr = ioremap(cxt->phys_addr, cxt->size);
if (!cxt->virt_addr) {
pr_err("ioremap failed\n");
goto fail_mem_region;
}
err = pstore_register(&cxt->pstore);
if (err) {
pr_err("registering with pstore failed\n");
goto fail_iounmap;
goto fail_buf;
}
/*
@ -275,15 +287,15 @@ static int __init ramoops_probe(struct platform_device *pdev)
return 0;
fail_iounmap:
iounmap(cxt->virt_addr);
fail_mem_region:
release_mem_region(cxt->phys_addr, cxt->size);
fail_buf:
kfree(cxt->pstore.buf);
fail_clear:
cxt->pstore.bufsize = 0;
cxt->max_count = 0;
fail_przs:
for (i = 0; cxt->przs[i]; i++)
persistent_ram_free(cxt->przs[i]);
kfree(cxt->przs);
fail_out:
return err;
}