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Date: Tue, 5 May 2020 11:45:08 -0400
From: Pavel Tatashin <pasha.tatashin@...een.com>
To: pasha.tatashin@...een.com, jmorris@...ei.org, sashal@...nel.org,
linux-kernel@...r.kernel.org, pmladek@...e.com,
sergey.senozhatsky@...il.com, rostedt@...dmis.org,
keescook@...omium.org, anton@...msg.org, ccross@...roid.com,
tony.luck@...el.com, robh+dt@...nel.org, devicetree@...r.kernel.org
Subject: [PATCH v2 3/5] pstore/ram: in ramoops_platform_data convert dump_oops to max_reason
Now, that pstore_register() can correctly pass max_reason to kmesg dump
facility, use it instead of dump_oops boolean.
Replace in ramoops_platform_data dump_oops with max_reason. When dump_oops
was enabled set max_reason to KMSG_DUMP_OOPS, otherwise set it to
KMSG_DUMP_PANIC.
Remove filtering logic from ramoops_pstore_write(), as that is not needed
anymore, only dmesges specified by max_reason are passed to
ramoops_pstore_write(). Also, because of this, we can remove
cxt->dump_oops.
Signed-off-by: Pavel Tatashin <pasha.tatashin@...een.com>
---
Documentation/admin-guide/ramoops.rst | 11 ++++++----
drivers/platform/chrome/chromeos_pstore.c | 2 +-
fs/pstore/ram.c | 26 +++++++----------------
include/linux/pstore_ram.h | 2 +-
4 files changed, 17 insertions(+), 24 deletions(-)
diff --git a/Documentation/admin-guide/ramoops.rst b/Documentation/admin-guide/ramoops.rst
index 6dbcc5481000..a296e1aa1617 100644
--- a/Documentation/admin-guide/ramoops.rst
+++ b/Documentation/admin-guide/ramoops.rst
@@ -32,11 +32,14 @@ memory to be mapped strongly ordered, and atomic operations on strongly ordered
memory are implementation defined, and won't work on many ARMs such as omaps.
The memory area is divided into ``record_size`` chunks (also rounded down to
-power of two) and each oops/panic writes a ``record_size`` chunk of
+power of two) and each kmesg dump writes a ``record_size`` chunk of
information.
-Dumping both oopses and panics can be done by setting 1 in the ``dump_oops``
-variable while setting 0 in that variable dumps only the panics.
+Dumping reasons can be set via max_reason value, as defined in
+include/linux/kmsg_dump.h: kmsg_dump_reason. For example, to
+dump for both oopses and panics reasons, max_reason should be set to 2
+(KMSG_DUMP_OOPS), to dump panics only max_reason should be set to 1
+(KMSG_DUMP_PANIC).
The module uses a counter to record multiple dumps but the counter gets reset
on restart (i.e. new dumps after the restart will overwrite old ones).
@@ -90,7 +93,7 @@ Setting the ramoops parameters can be done in several different manners:
.mem_address = <...>,
.mem_type = <...>,
.record_size = <...>,
- .dump_oops = <...>,
+ .max_reason = <...>,
.ecc = <...>,
};
diff --git a/drivers/platform/chrome/chromeos_pstore.c b/drivers/platform/chrome/chromeos_pstore.c
index d13770785fb5..fa51153688b4 100644
--- a/drivers/platform/chrome/chromeos_pstore.c
+++ b/drivers/platform/chrome/chromeos_pstore.c
@@ -57,7 +57,7 @@ static struct ramoops_platform_data chromeos_ramoops_data = {
.record_size = 0x40000,
.console_size = 0x20000,
.ftrace_size = 0x20000,
- .dump_oops = 1,
+ .max_reason = KMSG_DUMP_OOPS,
};
static struct platform_device chromeos_ramoops = {
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 795622190c01..223581aeea96 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -81,7 +81,6 @@ struct ramoops_context {
size_t console_size;
size_t ftrace_size;
size_t pmsg_size;
- int dump_oops;
u32 flags;
struct persistent_ram_ecc_info ecc_info;
unsigned int max_dump_cnt;
@@ -381,18 +380,6 @@ static int notrace ramoops_pstore_write(struct pstore_record *record)
if (record->type != PSTORE_TYPE_DMESG)
return -EINVAL;
- /*
- * Out of the various dmesg dump types, ramoops is currently designed
- * to only store crash logs, rather than storing general kernel logs.
- */
- if (record->reason != KMSG_DUMP_OOPS &&
- record->reason != KMSG_DUMP_PANIC)
- return -EINVAL;
-
- /* Skip Oopes when configured to do so. */
- if (record->reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
- return -EINVAL;
-
/*
* Explicitly only take the first part of any new crash.
* If our buffer is larger than kmsg_bytes, this can never happen,
@@ -687,7 +674,7 @@ static int ramoops_parse_dt(struct platform_device *pdev,
pdata->mem_size = resource_size(res);
pdata->mem_address = res->start;
pdata->mem_type = of_property_read_bool(of_node, "unbuffered");
- pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops");
+ dump_oops = !of_property_read_bool(of_node, "no-dump-oops");
#define parse_size(name, field) { \
ret = ramoops_parse_dt_size(pdev, name, &value); \
@@ -785,7 +772,6 @@ static int ramoops_probe(struct platform_device *pdev)
cxt->console_size = pdata->console_size;
cxt->ftrace_size = pdata->ftrace_size;
cxt->pmsg_size = pdata->pmsg_size;
- cxt->dump_oops = pdata->dump_oops;
cxt->flags = pdata->flags;
cxt->ecc_info = pdata->ecc_info;
@@ -828,8 +814,14 @@ static int ramoops_probe(struct platform_device *pdev)
* the single region size is how to check.
*/
cxt->pstore.flags = 0;
- if (cxt->max_dump_cnt)
+ if (cxt->max_dump_cnt) {
cxt->pstore.flags |= PSTORE_FLAGS_DMESG;
+ if (pdata->max_reason <= 0) {
+ pdata->max_reason = dump_oops ? KMSG_DUMP_OOPS :
+ KMSG_DUMP_PANIC;
+ }
+ cxt->pstore.max_reason = pdata->max_reason;
+ }
if (cxt->console_size)
cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
if (cxt->max_ftrace_cnt)
@@ -865,7 +857,6 @@ static int ramoops_probe(struct platform_device *pdev)
mem_size = pdata->mem_size;
mem_address = pdata->mem_address;
record_size = pdata->record_size;
- dump_oops = pdata->dump_oops;
ramoops_console_size = pdata->console_size;
ramoops_pmsg_size = pdata->pmsg_size;
ramoops_ftrace_size = pdata->ftrace_size;
@@ -948,7 +939,6 @@ static void __init ramoops_register_dummy(void)
pdata.console_size = ramoops_console_size;
pdata.ftrace_size = ramoops_ftrace_size;
pdata.pmsg_size = ramoops_pmsg_size;
- pdata.dump_oops = dump_oops;
pdata.flags = RAMOOPS_FLAG_FTRACE_PER_CPU;
/*
diff --git a/include/linux/pstore_ram.h b/include/linux/pstore_ram.h
index 9cb9b9067298..9f16afec7290 100644
--- a/include/linux/pstore_ram.h
+++ b/include/linux/pstore_ram.h
@@ -133,7 +133,7 @@ struct ramoops_platform_data {
unsigned long console_size;
unsigned long ftrace_size;
unsigned long pmsg_size;
- int dump_oops;
+ int max_reason;
u32 flags;
struct persistent_ram_ecc_info ecc_info;
};
--
2.25.1
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