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pstore: Add mem_type property DT parsing support

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There could be a scenario where we define some region
in normal memory and use them store to logs which is later
retrieved by bootloader during warm reset.

In this scenario, we wanted to treat this memory as normal
cacheable memory instead of default behaviour which
is an overhead. Making it cacheable could improve
performance.

This commit gives control to change mem_type from Device
tree, and also documents the value for normal memory.

Signed-off-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/1616438537-13719-1-git-send-email-mojha@codeaurora.org
This commit is contained in:
Mukesh Ojha 2021-03-23 00:12:17 +05:30 committed by Kees Cook
parent a38fd87484
commit 9d843e8faf
4 changed files with 33 additions and 6 deletions
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4
Documentation/admin-guide/ramoops.rst
View File

@ -3,7 +3,7 @@ Ramoops oops/panic logger
Sergiu Iordache <sergiu@chromium.org>
Updated: 17 November 2011
Updated: 10 Feb 2021
Introduction
------------
@ -30,6 +30,8 @@ mapping to pgprot_writecombine. Setting ``mem_type=1`` attempts to use
depends on atomic operations. At least on ARM, pgprot_noncached causes the
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.
Setting ``mem_type=2`` attempts to treat the memory region as normal memory,
which enables full cache on it. This can improve the performance.
The memory area is divided into ``record_size`` chunks (also rounded down to
power of two) and each kmesg dump writes a ``record_size`` chunk of

10
Documentation/devicetree/bindings/reserved-memory/ramoops.txt
View File

@ -42,8 +42,14 @@ Optional properties:
- pmsg-size: size in bytes of log buffer reserved for userspace messages
(defaults to 0: disabled)
- unbuffered: if present, use unbuffered mappings to map the reserved region
(defaults to buffered mappings)
- mem-type: if present, sets the type of mapping is to be used to map the
reserved region. mem-type: 0 = write-combined (default), 1 = unbuffered,
2 = cached.
- unbuffered: deprecated, use mem_type instead. If present, and mem_type is
not specified, it is equivalent to mem_type = 1 and uses unbuffered mappings
to map the reserved region (defaults to buffered mappings mem_type = 0). If
both are specified -- "mem_type" overrides "unbuffered".
- max-reason: if present, sets maximum type of kmsg dump reasons to store
(defaults to 2: log Oopses and Panics). This can be set to INT_MAX to

7
fs/pstore/ram.c
View File

@ -56,7 +56,7 @@ MODULE_PARM_DESC(mem_size,
static unsigned int mem_type;
module_param(mem_type, uint, 0400);
MODULE_PARM_DESC(mem_type,
"set to 1 to try to use unbuffered memory (default 0)");
"memory type: 0=write-combined (default), 1=unbuffered, 2=cached");
static int ramoops_max_reason = -1;
module_param_named(max_reason, ramoops_max_reason, int, 0400);
@ -648,6 +648,10 @@ static int ramoops_parse_dt(struct platform_device *pdev,
pdata->mem_size = resource_size(res);
pdata->mem_address = res->start;
/*
* Setting "unbuffered" is deprecated and will be ignored if
* "mem_type" is also specified.
*/
pdata->mem_type = of_property_read_bool(of_node, "unbuffered");
/*
* Setting "no-dump-oops" is deprecated and will be ignored if
@ -666,6 +670,7 @@ static int ramoops_parse_dt(struct platform_device *pdev,
field = value; \
}
parse_u32("mem-type", pdata->record_size, pdata->mem_type);
parse_u32("record-size", pdata->record_size, 0);
parse_u32("console-size", pdata->console_size, 0);
parse_u32("ftrace-size", pdata->ftrace_size, 0);

18
fs/pstore/ram_core.c
View File

@ -396,6 +396,10 @@ void persistent_ram_zap(struct persistent_ram_zone *prz)
persistent_ram_update_header_ecc(prz);
}
#define MEM_TYPE_WCOMBINE 0
#define MEM_TYPE_NONCACHED 1
#define MEM_TYPE_NORMAL 2
static void *persistent_ram_vmap(phys_addr_t start, size_t size,
unsigned int memtype)
{
@ -409,10 +413,20 @@ static void *persistent_ram_vmap(phys_addr_t start, size_t size,
page_start = start - offset_in_page(start);
page_count = DIV_ROUND_UP(size + offset_in_page(start), PAGE_SIZE);
if (memtype)
switch (memtype) {
case MEM_TYPE_NORMAL:
prot = PAGE_KERNEL;
break;
case MEM_TYPE_NONCACHED:
prot = pgprot_noncached(PAGE_KERNEL);
else
break;
case MEM_TYPE_WCOMBINE:
prot = pgprot_writecombine(PAGE_KERNEL);
break;
default:
pr_err("invalid mem_type=%d\n", memtype);
return NULL;
}
pages = kmalloc_array(page_count, sizeof(struct page *), GFP_KERNEL);
if (!pages) {