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pstore-ram: Allow optional mapping with pgprot_noncached

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On some ARMs the memory can be mapped pgprot_noncached() and still
be working for atomic operations. As pointed out by Colin Cross
<ccross@android.com>, in some cases you do want to use
pgprot_noncached() if the SoC supports it to see a debug printk
just before a write hanging the system.

On ARMs, the atomic operations on strongly ordered memory are
implementation defined. So let's provide an optional kernel parameter
for configuring pgprot_noncached(), and use pgprot_writecombine() by
default.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Rob Herring <robherring2@gmail.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Anton Vorontsov <anton@enomsg.org>
Cc: Colin Cross <ccross@android.com>
Cc: Olof Johansson <olof@lixom.net>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: stable@vger.kernel.org
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Tony Lindgren
2014-09-16 13:50:01 -07:00
committed by Tony Luck
parent 7ae9cb8193
commit 027bc8b082
4 changed files with 47 additions and 14 deletions
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4
include/linux/pstore_ram.h
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@@ -53,7 +53,8 @@ struct persistent_ram_zone {
};
struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size,
u32 sig, struct persistent_ram_ecc_info *ecc_info);
u32 sig, struct persistent_ram_ecc_info *ecc_info,
unsigned int memtype);
void persistent_ram_free(struct persistent_ram_zone *prz);
void persistent_ram_zap(struct persistent_ram_zone *prz);
@@ -76,6 +77,7 @@ ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz,
struct ramoops_platform_data {
unsigned long mem_size;
unsigned long mem_address;
unsigned int mem_type;
unsigned long record_size;
unsigned long console_size;
unsigned long ftrace_size;