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pstore: Make ramoops_init_przs generic for other prz arrays

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Currently ramoops_init_przs() is hard wired only for panic dump zone
array. In preparation for the ftrace zone array (one zone per-cpu) and pmsg
zone array, make the function more generic to be able to handle this case.

Heavily based on similar work from Joel Fernandes.

Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2016-11-11 11:48:06 -08:00
parent 663deb4788
commit de83209249
1 changed files with 55 additions and 29 deletions
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84
fs/pstore/ram.c
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@ -405,53 +405,78 @@ static void ramoops_free_przs(struct ramoops_context *cxt)
}
static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
phys_addr_t *paddr, size_t dump_mem_sz)
struct persistent_ram_zone ***przs,
phys_addr_t *paddr, size_t mem_sz,
ssize_t record_size,
unsigned int *cnt, u32 sig, u32 flags)
{
int err = -ENOMEM;
int i;
size_t zone_sz;
struct persistent_ram_zone **prz_ar;
if (!cxt->record_size)
/* Allocate nothing for 0 mem_sz or 0 record_size. */
if (mem_sz == 0 || record_size == 0) {
*cnt = 0;
return 0;
if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) {
dev_err(dev, "no room for dumps\n");
return -ENOMEM;
}
cxt->max_dump_cnt = dump_mem_sz / cxt->record_size;
if (!cxt->max_dump_cnt)
return -ENOMEM;
cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt,
GFP_KERNEL);
if (!cxt->przs) {
dev_err(dev, "failed to initialize a prz array for dumps\n");
goto fail_mem;
/*
* If we have a negative record size, calculate it based on
* mem_sz / *cnt. If we have a positive record size, calculate
* cnt from mem_sz / record_size.
*/
if (record_size < 0) {
if (*cnt == 0)
return 0;
record_size = mem_sz / *cnt;
if (record_size == 0)
goto fail;
} else {
*cnt = mem_sz / record_size;
if (*cnt == 0)
goto fail;
}
for (i = 0; i < cxt->max_dump_cnt; i++) {
cxt->przs[i] = persistent_ram_new(*paddr, cxt->record_size, 0,
if (*paddr + mem_sz - cxt->phys_addr > cxt->size) {
dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
mem_sz, (unsigned long long)*paddr,
cxt->size, (unsigned long long)cxt->phys_addr);
goto fail;
}
zone_sz = mem_sz / *cnt;
if (!zone_sz)
goto fail;
prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL);
if (!prz_ar)
goto fail;
for (i = 0; i < *cnt; i++) {
prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig,
&cxt->ecc_info,
cxt->memtype, 0);
if (IS_ERR(cxt->przs[i])) {
err = PTR_ERR(cxt->przs[i]);
cxt->memtype, flags);
if (IS_ERR(prz_ar[i])) {
err = PTR_ERR(prz_ar[i]);
dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
cxt->record_size, (unsigned long long)*paddr, err);
record_size, (unsigned long long)*paddr, err);
while (i > 0) {
i--;
persistent_ram_free(cxt->przs[i]);
persistent_ram_free(prz_ar[i]);
}
goto fail_prz;
kfree(prz_ar);
goto fail;
}
*paddr += cxt->record_size;
*paddr += zone_sz;
}
*przs = prz_ar;
return 0;
fail_prz:
kfree(cxt->przs);
fail_mem:
cxt->max_dump_cnt = 0;
fail:
*cnt = 0;
return err;
}
@ -605,7 +630,8 @@ static int ramoops_probe(struct platform_device *pdev)
dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
- cxt->pmsg_size;
err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz);
err = ramoops_init_przs(dev, cxt, &cxt->przs, &paddr, dump_mem_sz,
cxt->record_size, &cxt->max_dump_cnt, 0, 0);
if (err)
goto fail_out;