From: Anton Vorontsov <anton@enomsg.org>
To: linux-kernel@vger.kernel.org
Cc: "Tony Luck" <tony.luck@intel.com>,
"Kees Cook" <keescook@chromium.org>,
"Colin Cross" <ccross@android.com>,
"Arve Hjønnevåg" <arve@android.com>,
"John Stultz" <john.stultz@linaro.org>,
linaro-kernel@lists.linaro.org, patches@linaro.org,
kernel-team@android.com
Subject: [PATCH 2/3] pstore/ram: Allow specifying ecc parameters in platform data
Date: Sun, 31 Mar 2013 20:25:07 -0700 [thread overview]
Message-ID: <20130401032507.GB17424@lizard> (raw)
In-Reply-To: <20130401032256.GA13801@lizard>
From: Arve Hjønnevåg <arve@android.com>
Allow specifying ecc parameters in platform data
Signed-off-by: Arve Hjønnevåg <arve@android.com>
[jstultz: Tweaked commit subject & add commit message]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Anton Vorontsov <anton@enomsg.org>
---
fs/pstore/ram.c | 15 ++++++-----
fs/pstore/ram_core.c | 64 ++++++++++++++++++++++++----------------------
include/linux/pstore_ram.h | 14 +++++++---
3 files changed, 52 insertions(+), 41 deletions(-)
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 38babb3..a5ee252 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -83,7 +83,7 @@ struct ramoops_context {
size_t console_size;
size_t ftrace_size;
int dump_oops;
- int ecc_size;
+ struct persistent_ram_ecc_info ecc_info;
unsigned int max_dump_cnt;
unsigned int dump_write_cnt;
unsigned int dump_read_cnt;
@@ -322,7 +322,8 @@ 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, 0, cxt->ecc_size);
+ cxt->przs[i] = persistent_ram_new(*paddr, sz, 0,
+ &cxt->ecc_info);
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",
@@ -352,7 +353,7 @@ static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt,
return -ENOMEM;
}
- *prz = persistent_ram_new(*paddr, sz, sig, cxt->ecc_size);
+ *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info);
if (IS_ERR(*prz)) {
int err = PTR_ERR(*prz);
@@ -406,7 +407,7 @@ static int ramoops_probe(struct platform_device *pdev)
cxt->console_size = pdata->console_size;
cxt->ftrace_size = pdata->ftrace_size;
cxt->dump_oops = pdata->dump_oops;
- cxt->ecc_size = pdata->ecc_size;
+ cxt->ecc_info = pdata->ecc_info;
paddr = cxt->phys_addr;
@@ -464,9 +465,9 @@ static int ramoops_probe(struct platform_device *pdev)
record_size = pdata->record_size;
dump_oops = pdata->dump_oops;
- pr_info("attached 0x%lx@0x%llx, ecc: %d\n",
+ pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
cxt->size, (unsigned long long)cxt->phys_addr,
- cxt->ecc_size);
+ cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
return 0;
@@ -538,7 +539,7 @@ static void ramoops_register_dummy(void)
* 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_data->ecc_info.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 e5afa22..c6f641c 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -82,12 +82,12 @@ static void notrace persistent_ram_encode_rs8(struct persistent_ram_zone *prz,
uint8_t *data, size_t len, uint8_t *ecc)
{
int i;
- uint16_t par[prz->ecc_size];
+ uint16_t par[prz->ecc_info.ecc_size];
/* Initialize the parity buffer */
memset(par, 0, sizeof(par));
encode_rs8(prz->rs_decoder, data, len, par, 0);
- for (i = 0; i < prz->ecc_size; i++)
+ for (i = 0; i < prz->ecc_info.ecc_size; i++)
ecc[i] = par[i];
}
@@ -95,9 +95,9 @@ static int persistent_ram_decode_rs8(struct persistent_ram_zone *prz,
void *data, size_t len, uint8_t *ecc)
{
int i;
- uint16_t par[prz->ecc_size];
+ uint16_t par[prz->ecc_info.ecc_size];
- for (i = 0; i < prz->ecc_size; i++)
+ for (i = 0; i < prz->ecc_info.ecc_size; i++)
par[i] = ecc[i];
return decode_rs8(prz->rs_decoder, data, par, len,
NULL, 0, NULL, 0, NULL);
@@ -110,15 +110,15 @@ static void notrace persistent_ram_update_ecc(struct persistent_ram_zone *prz,
uint8_t *buffer_end = buffer->data + prz->buffer_size;
uint8_t *block;
uint8_t *par;
- int ecc_block_size = prz->ecc_block_size;
- int ecc_size = prz->ecc_size;
- int size = prz->ecc_block_size;
+ int ecc_block_size = prz->ecc_info.block_size;
+ int ecc_size = prz->ecc_info.ecc_size;
+ int size = ecc_block_size;
- if (!prz->ecc_size)
+ if (!ecc_size)
return;
block = buffer->data + (start & ~(ecc_block_size - 1));
- par = prz->par_buffer + (start / ecc_block_size) * prz->ecc_size;
+ par = prz->par_buffer + (start / ecc_block_size) * ecc_size;
do {
if (block + ecc_block_size > buffer_end)
@@ -133,7 +133,7 @@ static void persistent_ram_update_header_ecc(struct persistent_ram_zone *prz)
{
struct persistent_ram_buffer *buffer = prz->buffer;
- if (!prz->ecc_size)
+ if (!prz->ecc_info.ecc_size)
return;
persistent_ram_encode_rs8(prz, (uint8_t *)buffer, sizeof(*buffer),
@@ -146,14 +146,14 @@ static void persistent_ram_ecc_old(struct persistent_ram_zone *prz)
uint8_t *block;
uint8_t *par;
- if (!prz->ecc_size)
+ if (!prz->ecc_info.ecc_size)
return;
block = buffer->data;
par = prz->par_buffer;
while (block < buffer->data + buffer_size(prz)) {
int numerr;
- int size = prz->ecc_block_size;
+ int size = prz->ecc_info.block_size;
if (block + size > buffer->data + prz->buffer_size)
size = buffer->data + prz->buffer_size - block;
numerr = persistent_ram_decode_rs8(prz, block, size, par);
@@ -166,45 +166,49 @@ static void persistent_ram_ecc_old(struct persistent_ram_zone *prz)
block);
prz->bad_blocks++;
}
- block += prz->ecc_block_size;
- par += prz->ecc_size;
+ block += prz->ecc_info.block_size;
+ par += prz->ecc_info.ecc_size;
}
}
static int persistent_ram_init_ecc(struct persistent_ram_zone *prz,
- int ecc_size)
+ struct persistent_ram_ecc_info *ecc_info)
{
int numerr;
struct persistent_ram_buffer *buffer = prz->buffer;
int ecc_blocks;
size_t ecc_total;
- int ecc_symsize = 8;
- int ecc_poly = 0x11d;
- if (!ecc_size)
+ if (!ecc_info || !ecc_info->ecc_size)
return 0;
- prz->ecc_block_size = 128;
- prz->ecc_size = ecc_size;
+ prz->ecc_info.block_size = ecc_info->block_size ?: 128;
+ prz->ecc_info.ecc_size = ecc_info->ecc_size ?: 16;
+ prz->ecc_info.symsize = ecc_info->symsize ?: 8;
+ prz->ecc_info.poly = ecc_info->poly ?: 0x11d;
- ecc_blocks = DIV_ROUND_UP(prz->buffer_size - prz->ecc_size,
- prz->ecc_block_size + prz->ecc_size);
- ecc_total = (ecc_blocks + 1) * prz->ecc_size;
+ ecc_blocks = DIV_ROUND_UP(prz->buffer_size - prz->ecc_info.ecc_size,
+ prz->ecc_info.block_size +
+ prz->ecc_info.ecc_size);
+ ecc_total = (ecc_blocks + 1) * prz->ecc_info.ecc_size;
if (ecc_total >= prz->buffer_size) {
pr_err("%s: invalid ecc_size %u (total %zu, buffer size %zu)\n",
- __func__, prz->ecc_size, ecc_total, prz->buffer_size);
+ __func__, prz->ecc_info.ecc_size,
+ ecc_total, prz->buffer_size);
return -EINVAL;
}
prz->buffer_size -= ecc_total;
prz->par_buffer = buffer->data + prz->buffer_size;
- prz->par_header = prz->par_buffer + ecc_blocks * prz->ecc_size;
+ prz->par_header = prz->par_buffer +
+ ecc_blocks * prz->ecc_info.ecc_size;
/*
* first consecutive root is 0
* primitive element to generate roots = 1
*/
- prz->rs_decoder = init_rs(ecc_symsize, ecc_poly, 0, 1, prz->ecc_size);
+ prz->rs_decoder = init_rs(prz->ecc_info.symsize, prz->ecc_info.poly,
+ 0, 1, prz->ecc_info.ecc_size);
if (prz->rs_decoder == NULL) {
pr_info("persistent_ram: init_rs failed\n");
return -EINVAL;
@@ -392,11 +396,11 @@ static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size,
}
static int persistent_ram_post_init(struct persistent_ram_zone *prz, u32 sig,
- int ecc_size)
+ struct persistent_ram_ecc_info *ecc_info)
{
int ret;
- ret = persistent_ram_init_ecc(prz, ecc_size);
+ ret = persistent_ram_init_ecc(prz, ecc_info);
if (ret)
return ret;
@@ -445,7 +449,7 @@ void persistent_ram_free(struct persistent_ram_zone *prz)
}
struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size,
- u32 sig, int ecc_size)
+ u32 sig, struct persistent_ram_ecc_info *ecc_info)
{
struct persistent_ram_zone *prz;
int ret = -ENOMEM;
@@ -460,7 +464,7 @@ struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size,
if (ret)
goto err;
- ret = persistent_ram_post_init(prz, sig, ecc_size);
+ ret = persistent_ram_post_init(prz, sig, ecc_info);
if (ret)
goto err;
diff --git a/include/linux/pstore_ram.h b/include/linux/pstore_ram.h
index cb6ab5f..9974975 100644
--- a/include/linux/pstore_ram.h
+++ b/include/linux/pstore_ram.h
@@ -26,6 +26,13 @@
struct persistent_ram_buffer;
struct rs_control;
+struct persistent_ram_ecc_info {
+ int block_size;
+ int ecc_size;
+ int symsize;
+ int poly;
+};
+
struct persistent_ram_zone {
phys_addr_t paddr;
size_t size;
@@ -39,15 +46,14 @@ struct persistent_ram_zone {
struct rs_control *rs_decoder;
int corrected_bytes;
int bad_blocks;
- int ecc_block_size;
- int ecc_size;
+ struct persistent_ram_ecc_info ecc_info;
char *old_log;
size_t old_log_size;
};
struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size,
- u32 sig, int ecc_size);
+ u32 sig, struct persistent_ram_ecc_info *ecc_info);
void persistent_ram_free(struct persistent_ram_zone *prz);
void persistent_ram_zap(struct persistent_ram_zone *prz);
@@ -74,7 +80,7 @@ struct ramoops_platform_data {
unsigned long console_size;
unsigned long ftrace_size;
int dump_oops;
- int ecc_size;
+ struct persistent_ram_ecc_info ecc_info;
};
#endif
--
1.8.1.4
next prev parent reply other threads:[~2013-04-01 3:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-01 3:22 [PATCH 0/3] Sync Android pstore updates Anton Vorontsov
2013-04-01 3:24 ` [PATCH 1/3] pstore/ram: Include ecc_size when calculating ecc_block Anton Vorontsov
2013-04-01 3:25 ` Anton Vorontsov [this message]
2013-04-01 3:25 ` [PATCH 3/3] pstore/ram: Restore ecc information block Anton Vorontsov
2013-04-01 19:16 ` [PATCH 0/3] Sync Android pstore updates Kees Cook
2013-04-04 4:51 ` Anton Vorontsov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20130401032507.GB17424@lizard \
--to=anton@enomsg.org \
--cc=arve@android.com \
--cc=ccross@android.com \
--cc=john.stultz@linaro.org \
--cc=keescook@chromium.org \
--cc=kernel-team@android.com \
--cc=linaro-kernel@lists.linaro.org \
--cc=linux-kernel@vger.kernel.org \
--cc=patches@linaro.org \
--cc=tony.luck@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.