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Diffstat (limited to 'fs/pstore/ram_core.c')
-rw-r--r--fs/pstore/ram_core.c149
1 files changed, 40 insertions, 109 deletions
diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index c5fbdbbf81a..0306303be37 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -35,8 +35,6 @@ struct persistent_ram_buffer {
#define PERSISTENT_RAM_SIG (0x43474244) /* DBGC */
-static __initdata LIST_HEAD(persistent_ram_list);
-
static inline size_t buffer_size(struct persistent_ram_zone *prz)
{
return atomic_read(&prz->buffer->size);
@@ -116,7 +114,7 @@ static void notrace persistent_ram_update_ecc(struct persistent_ram_zone *prz,
int ecc_size = prz->ecc_size;
int size = prz->ecc_block_size;
- if (!prz->ecc)
+ if (!prz->ecc_size)
return;
block = buffer->data + (start & ~(ecc_block_size - 1));
@@ -135,7 +133,7 @@ static void persistent_ram_update_header_ecc(struct persistent_ram_zone *prz)
{
struct persistent_ram_buffer *buffer = prz->buffer;
- if (!prz->ecc)
+ if (!prz->ecc_size)
return;
persistent_ram_encode_rs8(prz, (uint8_t *)buffer, sizeof(*buffer),
@@ -148,7 +146,7 @@ static void persistent_ram_ecc_old(struct persistent_ram_zone *prz)
uint8_t *block;
uint8_t *par;
- if (!prz->ecc)
+ if (!prz->ecc_size)
return;
block = buffer->data;
@@ -174,29 +172,30 @@ static void persistent_ram_ecc_old(struct persistent_ram_zone *prz)
}
static int persistent_ram_init_ecc(struct persistent_ram_zone *prz,
- size_t buffer_size)
+ int ecc_size)
{
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 (!prz->ecc)
+ if (!ecc_size)
return 0;
prz->ecc_block_size = 128;
- prz->ecc_size = 16;
- prz->ecc_symsize = 8;
- prz->ecc_poly = 0x11d;
+ prz->ecc_size = ecc_size;
ecc_blocks = DIV_ROUND_UP(prz->buffer_size, prz->ecc_block_size);
- prz->buffer_size -= (ecc_blocks + 1) * prz->ecc_size;
-
- if (prz->buffer_size > buffer_size) {
- pr_err("persistent_ram: invalid size %zu, non-ecc datasize %zu\n",
- buffer_size, prz->buffer_size);
+ ecc_total = (ecc_blocks + 1) * prz->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);
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;
@@ -204,8 +203,7 @@ static int persistent_ram_init_ecc(struct persistent_ram_zone *prz,
* first consecutive root is 0
* primitive element to generate roots = 1
*/
- prz->rs_decoder = init_rs(prz->ecc_symsize, prz->ecc_poly, 0, 1,
- prz->ecc_size);
+ prz->rs_decoder = init_rs(ecc_symsize, ecc_poly, 0, 1, prz->ecc_size);
if (prz->rs_decoder == NULL) {
pr_info("persistent_ram: init_rs failed\n");
return -EINVAL;
@@ -392,35 +390,36 @@ static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size,
return 0;
}
-static int __init persistent_ram_post_init(struct persistent_ram_zone *prz, bool ecc)
+static int persistent_ram_post_init(struct persistent_ram_zone *prz, u32 sig,
+ int ecc_size)
{
int ret;
- prz->ecc = ecc;
-
- ret = persistent_ram_init_ecc(prz, prz->buffer_size);
+ ret = persistent_ram_init_ecc(prz, ecc_size);
if (ret)
return ret;
- if (prz->buffer->sig == PERSISTENT_RAM_SIG) {
+ sig ^= PERSISTENT_RAM_SIG;
+
+ if (prz->buffer->sig == sig) {
if (buffer_size(prz) > prz->buffer_size ||
buffer_start(prz) > buffer_size(prz))
pr_info("persistent_ram: found existing invalid buffer,"
" size %zu, start %zu\n",
buffer_size(prz), buffer_start(prz));
else {
- pr_info("persistent_ram: found existing buffer,"
+ pr_debug("persistent_ram: found existing buffer,"
" size %zu, start %zu\n",
buffer_size(prz), buffer_start(prz));
persistent_ram_save_old(prz);
return 0;
}
} else {
- pr_info("persistent_ram: no valid data in buffer"
+ pr_debug("persistent_ram: no valid data in buffer"
" (sig = 0x%08x)\n", prz->buffer->sig);
}
- prz->buffer->sig = PERSISTENT_RAM_SIG;
+ prz->buffer->sig = sig;
persistent_ram_zap(prz);
return 0;
@@ -428,19 +427,24 @@ static int __init persistent_ram_post_init(struct persistent_ram_zone *prz, bool
void persistent_ram_free(struct persistent_ram_zone *prz)
{
- if (pfn_valid(prz->paddr >> PAGE_SHIFT)) {
- vunmap(prz->vaddr);
- } else {
- iounmap(prz->vaddr);
- release_mem_region(prz->paddr, prz->size);
+ if (!prz)
+ return;
+
+ if (prz->vaddr) {
+ if (pfn_valid(prz->paddr >> PAGE_SHIFT)) {
+ vunmap(prz->vaddr);
+ } else {
+ iounmap(prz->vaddr);
+ release_mem_region(prz->paddr, prz->size);
+ }
+ prz->vaddr = NULL;
}
persistent_ram_free_old(prz);
kfree(prz);
}
-struct persistent_ram_zone * __init persistent_ram_new(phys_addr_t start,
- size_t size,
- bool ecc)
+struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size,
+ u32 sig, int ecc_size)
{
struct persistent_ram_zone *prz;
int ret = -ENOMEM;
@@ -455,85 +459,12 @@ struct persistent_ram_zone * __init persistent_ram_new(phys_addr_t start,
if (ret)
goto err;
- persistent_ram_post_init(prz, ecc);
-
- return prz;
-err:
- kfree(prz);
- return ERR_PTR(ret);
-}
-
-#ifndef MODULE
-static int __init persistent_ram_buffer_init(const char *name,
- struct persistent_ram_zone *prz)
-{
- int i;
- struct persistent_ram *ram;
- struct persistent_ram_descriptor *desc;
- phys_addr_t start;
-
- list_for_each_entry(ram, &persistent_ram_list, node) {
- start = ram->start;
- for (i = 0; i < ram->num_descs; i++) {
- desc = &ram->descs[i];
- if (!strcmp(desc->name, name))
- return persistent_ram_buffer_map(start,
- desc->size, prz);
- start += desc->size;
- }
- }
-
- return -EINVAL;
-}
-
-static __init
-struct persistent_ram_zone *__persistent_ram_init(struct device *dev, bool ecc)
-{
- struct persistent_ram_zone *prz;
- int ret = -ENOMEM;
-
- prz = kzalloc(sizeof(struct persistent_ram_zone), GFP_KERNEL);
- if (!prz) {
- pr_err("persistent_ram: failed to allocate persistent ram zone\n");
- goto err;
- }
-
- ret = persistent_ram_buffer_init(dev_name(dev), prz);
- if (ret) {
- pr_err("persistent_ram: failed to initialize buffer\n");
+ ret = persistent_ram_post_init(prz, sig, ecc_size);
+ if (ret)
goto err;
- }
-
- persistent_ram_post_init(prz, ecc);
return prz;
err:
- kfree(prz);
+ persistent_ram_free(prz);
return ERR_PTR(ret);
}
-
-struct persistent_ram_zone * __init
-persistent_ram_init_ringbuffer(struct device *dev, bool ecc)
-{
- return __persistent_ram_init(dev, ecc);
-}
-
-int __init persistent_ram_early_init(struct persistent_ram *ram)
-{
- int ret;
-
- ret = memblock_reserve(ram->start, ram->size);
- if (ret) {
- pr_err("Failed to reserve persistent memory from %08lx-%08lx\n",
- (long)ram->start, (long)(ram->start + ram->size - 1));
- return ret;
- }
-
- list_add_tail(&ram->node, &persistent_ram_list);
-
- pr_info("Initialized persistent memory from %08lx-%08lx\n",
- (long)ram->start, (long)(ram->start + ram->size - 1));
-
- return 0;
-}
-#endif