[PATCH 2/3] pstore/ram: Make ECC size configurable

Anton Vorontsov
2012-07-10T00:06:58Z

This is now pretty straightforward: instead of using bool, just pass
an integer. For backwards compatibility ramoops.ecc=1 means 16 bytes
ECC (using 1 byte for ECC isn't much of use anyway).

Suggested-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
---
fs/pstore/ram.c | 22 ++++++++++++++--------
fs/pstore/ram_core.c | 15 ++++++++-------
include/linux/pstore_ram.h | 4 ++--
3 files changed, 24 insertions(+), 17 deletions(-)

diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 58b93fb..b39aebb 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -63,7 +63,9 @@ MODULE_PARM_DESC(dump_oops,
static int ramoops_ecc;
module_param_named(ecc, ramoops_ecc, int, 0600);
MODULE_PARM_DESC(ramoops_ecc,
- "set to 1 to enable ECC support");
+ "if non-zero, the option enables ECC support and specifies "
+ "ECC buffer size in bytes (1 is a special value, means 16 "
+ "bytes ECC)");

struct ramoops_context {
struct persistent_ram_zone **przs;
@@ -73,7 +75,7 @@ struct ramoops_context {
size_t record_size;
size_t console_size;
int dump_oops;
- bool ecc;
+ int ecc_size;
unsigned int max_dump_cnt;
unsigned int dump_write_cnt;
unsigned int dump_read_cnt;
@@ -288,7 +290,7 @@ static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
for (i = 0; i < cxt->max_dump_cnt; i++) {
size_t sz = cxt->record_size;

- cxt->przs[i] = persistent_ram_new(*paddr, sz, cxt->ecc);
+ cxt->przs[i] = persistent_ram_new(*paddr, sz, cxt->ecc_size);
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",
@@ -314,7 +316,7 @@ static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt,
if (*paddr + sz > *paddr + cxt->size)
return -ENOMEM;

- *prz = persistent_ram_new(*paddr, sz, cxt->ecc);
+ *prz = persistent_ram_new(*paddr, sz, cxt->ecc_size);
if (IS_ERR(*prz)) {
int err = PTR_ERR(*prz);

@@ -361,7 +363,7 @@ static int __devinit ramoops_probe(struct platform_device *pdev)
cxt->record_size = pdata->record_size;
cxt->console_size = pdata->console_size;
cxt->dump_oops = pdata->dump_oops;
- cxt->ecc = pdata->ecc;
+ cxt->ecc_size = pdata->ecc_size;

paddr = cxt->phys_addr;

@@ -411,9 +413,9 @@ static int __devinit ramoops_probe(struct platform_device *pdev)
record_size = pdata->record_size;
dump_oops = pdata->dump_oops;

- pr_info("attached 0x%lx@0x%llx, ecc: %s\n",
+ pr_info("attached 0x%lx@0x%llx, ecc: %d\n",
cxt->size, (unsigned long long)cxt->phys_addr,
- ramoops_ecc ? "on" : "off");
+ cxt->ecc_size);

return 0;

@@ -478,7 +480,11 @@ static void ramoops_register_dummy(void)
dummy_data->record_size = record_size;
dummy_data->console_size = ramoops_console_size;
dummy_data->dump_oops = dump_oops;
- dummy_data->ecc = ramoops_ecc;
+ /*
+ * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
+ * (using 1 byte for ECC isn't much of use anyway).
+ */
+ dummy_data->ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;

dummy = platform_device_register_data(NULL, "ramoops", -1,
dummy_data, sizeof(struct ramoops_platform_data));
diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index 3f4d6e6..7e5a2a9 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -171,7 +171,8 @@ static void persistent_ram_ecc_old(struct persistent_ram_zone *prz)
}
}

-static int persistent_ram_init_ecc(struct persistent_ram_zone *prz)
+static int persistent_ram_init_ecc(struct persistent_ram_zone *prz,
+ int ecc_size)
{
int numerr;
struct persistent_ram_buffer *buffer = prz->buffer;
@@ -184,7 +185,7 @@ static int persistent_ram_init_ecc(struct persistent_ram_zone *prz)
return 0;

prz->ecc_block_size = 128;
- prz->ecc_size = 16;
+ prz->ecc_size = ecc_size;

ecc_blocks = DIV_ROUND_UP(prz->buffer_size, prz->ecc_block_size);
ecc_total = (ecc_blocks + 1) * prz->ecc_size;
@@ -390,13 +391,13 @@ static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size,
}

static int __devinit persistent_ram_post_init(struct persistent_ram_zone *prz,
- bool ecc)
+ int ecc_size)
{
int ret;

- prz->ecc = ecc;
+ prz->ecc = ecc_size;

- ret = persistent_ram_init_ecc(prz);
+ ret = persistent_ram_init_ecc(prz, ecc_size);
if (ret)
return ret;

@@ -444,7 +445,7 @@ void persistent_ram_free(struct persistent_ram_zone *prz)

struct persistent_ram_zone * __devinit persistent_ram_new(phys_addr_t start,
size_t size,
- bool ecc)
+ int ecc_size)
{
struct persistent_ram_zone *prz;
int ret = -ENOMEM;
@@ -459,7 +460,7 @@ struct persistent_ram_zone * __devinit persistent_ram_new(phys_addr_t start,
if (ret)
goto err;

- ret = persistent_ram_post_init(prz, ecc);
+ ret = persistent_ram_post_init(prz, ecc_size);
if (ret)
goto err;

diff --git a/include/linux/pstore_ram.h b/include/linux/pstore_ram.h
index a0975c0..94b79f1 100644
--- a/include/linux/pstore_ram.h
+++ b/include/linux/pstore_ram.h
@@ -48,7 +48,7 @@ struct persistent_ram_zone {

struct persistent_ram_zone * __devinit persistent_ram_new(phys_addr_t start,
size_t size,
- bool ecc);
+ int ecc_size);
void persistent_ram_free(struct persistent_ram_zone *prz);
void persistent_ram_zap(struct persistent_ram_zone *prz);

@@ -74,7 +74,7 @@ struct ramoops_platform_data {
unsigned long record_size;
unsigned long console_size;
int dump_oops;
- bool ecc;
+ int ecc_size;
};

#endif
--
1.7.10.4