diff options
| author | Marc Zyngier <marc.zyngier@arm.com> | 2015-03-06 16:37:41 +0000 |
|---|---|---|
| committer | Alex Shi <alex.shi@linaro.org> | 2015-11-07 12:16:06 +0800 |
| commit | 2b144b64ed3c449b9a23353001ce4cfbd20b43a2 (patch) | |
| tree | a75b31cc9e508b3c032363bade86e6526575d342 /include | |
| parent | ae29439c72a9a8e621ff64d9c32007c22c1e7dc4 (diff) | |
irqchip: gicv3-its: Allocate enough memory for the full range of DeviceID
The ITS table allocator is only allocating a single page per table.
This works fine for most things, but leads to silent lack of
interrupt delivery if we end-up with a device that has an ID that is
out of the range defined by a single page of memory. Even worse, depending
on the page size, behaviour changes, which is not a very good experience.
A solution is actually to allocate memory for the full range of ID that
the ITS supports. A massive waste memory wise, but at least a safe bet.
Tested on a Phytium SoC.
Tested-by: Chen Baozi <chenbaozi@kylinos.com.cn>
Acked-by: Chen Baozi <chenbaozi@kylinos.com.cn>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Link: https://lkml.kernel.org/r/1425659870-11832-3-git-send-email-marc.zyngier@arm.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
(cherry picked from commit f54b97ed0b17d3da5f98ba8188cd5646415a922d)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/irqchip/arm-gic-v3.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h index 1e8b0cf30792..3459b434cfc5 100644 --- a/include/linux/irqchip/arm-gic-v3.h +++ b/include/linux/irqchip/arm-gic-v3.h @@ -134,6 +134,8 @@ #define GITS_TRANSLATER 0x10040 +#define GITS_TYPER_DEVBITS_SHIFT 13 +#define GITS_TYPER_DEVBITS(r) ((((r) >> GITS_TYPER_DEVBITS_SHIFT) & 0x1f) + 1) #define GITS_TYPER_PTA (1UL << 19) #define GITS_CBASER_VALID (1UL << 63) |