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authorMarc Zyngier <marc.zyngier@arm.com>2015-03-06 16:37:41 +0000
committerJason Cooper <jason@lakedaemon.net>2015-03-08 05:32:52 +0000
commitf54b97ed0b17d3da5f98ba8188cd5646415a922d (patch)
tree4664ec806519ff6d594d547d8b31be5bc774fc0a /include
parent16acae729564ee0c3918342d8556cc42eeb29942 (diff)
downloadlinux-f54b97ed0b17d3da5f98ba8188cd5646415a922d.tar.bz2
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/irqchip/arm-gic-v3.h2
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 800544bc7bfd..cbdd440d486d 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -166,6 +166,8 @@
#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)