summaryrefslogtreecommitdiff
path: root/fs/pstore/ram.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/pstore/ram.c')
-rw-r--r--fs/pstore/ram.c79
1 files changed, 50 insertions, 29 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 0b311bc1891..f883e7e7430 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -32,6 +32,7 @@
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
+#include <linux/compiler.h>
#include <linux/pstore_ram.h>
#define RAMOOPS_KERNMSG_HDR "===="
@@ -131,9 +132,8 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
}
static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
- struct timespec *time,
- char **buf,
- struct pstore_info *psi)
+ int *count, struct timespec *time,
+ char **buf, struct pstore_info *psi)
{
ssize_t size;
struct ramoops_context *cxt = psi->data;
@@ -181,15 +181,14 @@ static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz)
return len;
}
-
-static int ramoops_pstore_write_buf(enum pstore_type_id type,
- enum kmsg_dump_reason reason,
- u64 *id, unsigned int part,
- const char *buf, size_t size,
- struct pstore_info *psi)
+static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
+ enum kmsg_dump_reason reason,
+ u64 *id, unsigned int part,
+ const char *buf, size_t size,
+ struct pstore_info *psi)
{
struct ramoops_context *cxt = psi->data;
- struct persistent_ram_zone *prz = cxt->przs[cxt->dump_write_cnt];
+ struct persistent_ram_zone *prz;
size_t hlen;
if (type == PSTORE_TYPE_CONSOLE) {
@@ -226,6 +225,11 @@ static int ramoops_pstore_write_buf(enum pstore_type_id type,
if (part != 1)
return -ENOSPC;
+ if (!cxt->przs)
+ return -ENOSPC;
+
+ prz = cxt->przs[cxt->dump_write_cnt];
+
hlen = ramoops_write_kmsg_hdr(prz);
if (size + hlen > prz->buffer_size)
size = prz->buffer_size - hlen;
@@ -236,8 +240,8 @@ static int ramoops_pstore_write_buf(enum pstore_type_id type,
return 0;
}
-static int ramoops_pstore_erase(enum pstore_type_id type, u64 id,
- struct pstore_info *psi)
+static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count,
+ struct timespec time, struct pstore_info *psi)
{
struct ramoops_context *cxt = psi->data;
struct persistent_ram_zone *prz;
@@ -287,8 +291,9 @@ static void ramoops_free_przs(struct ramoops_context *cxt)
kfree(cxt->przs);
}
-static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
- phys_addr_t *paddr, size_t dump_mem_sz)
+static int __devinit ramoops_init_przs(struct device *dev,
+ struct ramoops_context *cxt,
+ phys_addr_t *paddr, size_t dump_mem_sz)
{
int err = -ENOMEM;
int i;
@@ -296,6 +301,11 @@ static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
if (!cxt->record_size)
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;
@@ -326,15 +336,20 @@ fail_prz:
return err;
}
-static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt,
- struct persistent_ram_zone **prz,
- phys_addr_t *paddr, size_t sz, u32 sig)
+static int __devinit ramoops_init_prz(struct device *dev,
+ struct ramoops_context *cxt,
+ struct persistent_ram_zone **prz,
+ phys_addr_t *paddr, size_t sz, u32 sig)
{
if (!sz)
return 0;
- if (*paddr + sz > *paddr + cxt->size)
+ if (*paddr + sz - cxt->phys_addr > cxt->size) {
+ dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
+ sz, (unsigned long long)*paddr,
+ cxt->size, (unsigned long long)cxt->phys_addr);
return -ENOMEM;
+ }
*prz = persistent_ram_new(*paddr, sz, sig, cxt->ecc_size);
if (IS_ERR(*prz)) {
@@ -374,10 +389,14 @@ static int __devinit ramoops_probe(struct platform_device *pdev)
goto fail_out;
}
- pdata->mem_size = rounddown_pow_of_two(pdata->mem_size);
- pdata->record_size = rounddown_pow_of_two(pdata->record_size);
- pdata->console_size = rounddown_pow_of_two(pdata->console_size);
- pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
+ if (!is_power_of_2(pdata->mem_size))
+ pdata->mem_size = rounddown_pow_of_two(pdata->mem_size);
+ if (!is_power_of_2(pdata->record_size))
+ pdata->record_size = rounddown_pow_of_two(pdata->record_size);
+ if (!is_power_of_2(pdata->console_size))
+ pdata->console_size = rounddown_pow_of_two(pdata->console_size);
+ if (!is_power_of_2(pdata->ftrace_size))
+ pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
cxt->dump_read_cnt = 0;
cxt->size = pdata->mem_size;
@@ -406,7 +425,7 @@ static int __devinit ramoops_probe(struct platform_device *pdev)
goto fail_init_fprz;
if (!cxt->przs && !cxt->cprz && !cxt->fprz) {
- pr_err("memory size too small, minimum is %lu\n",
+ pr_err("memory size too small, minimum is %zu\n",
cxt->console_size + cxt->record_size +
cxt->ftrace_size);
goto fail_cnt;
@@ -414,13 +433,14 @@ static int __devinit ramoops_probe(struct platform_device *pdev)
cxt->pstore.data = cxt;
/*
- * Console can handle any buffer size, so prefer dumps buffer
- * size since usually it is smaller.
+ * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we
+ * have to handle dumps, we must have at least record_size buffer. And
+ * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be
+ * ZERO_SIZE_PTR).
*/
- if (cxt->przs)
- cxt->pstore.bufsize = cxt->przs[0]->buffer_size;
- else
- cxt->pstore.bufsize = cxt->cprz->buffer_size;
+ if (cxt->console_size)
+ cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */
+ cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize);
cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
spin_lock_init(&cxt->pstore.buf_lock);
if (!cxt->pstore.buf) {
@@ -537,6 +557,7 @@ postcore_initcall(ramoops_init);
static void __exit ramoops_exit(void)
{
platform_driver_unregister(&ramoops_driver);
+ platform_device_unregister(dummy);
kfree(dummy_data);
}
module_exit(ramoops_exit);
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-03 22:21:02 +0000