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authorMarc Zyngier <maz@kernel.org>2020-03-04 20:33:12 +0000
committerMarc Zyngier <maz@kernel.org>2020-03-20 17:48:21 +0000
commit9058a4e980648e7d068a7f7726a8ea4c67d0e88a (patch)
tree80a4e1431d39b6e0dcbcee6d9dad9f1b4c627a6b /include/linux/irqchip
parentb978c25f6ee7d4c79cbe918eed684e53887ec001 (diff)
irqchip/gic-v4.1: Ensure mutual exclusion betwen invalidations on the same RD
The GICv4.1 spec says that it is CONTRAINED UNPREDICTABLE to write to any of the GICR_INV{LPI,ALL}R registers if GICR_SYNCR.Busy == 1. To deal with it, we must ensure that only a single invalidation can happen at a time for a given redistributor. Add a per-RD lock to that effect and take it around the invalidation/syncr-read to deal with this. Signed-off-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Zenghui Yu <yuzenghui@huawei.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Link: https://lore.kernel.org/r/20200304203330.4967-6-maz@kernel.org
Diffstat (limited to 'include/linux/irqchip')
-rw-r--r--include/linux/irqchip/arm-gic-v3.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
index c29a02678a6f..b28acfa71f82 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -652,6 +652,7 @@
struct rdists {
struct {
+ raw_spinlock_t rd_lock;
void __iomem *rd_base;
struct page *pend_page;
phys_addr_t phys_base;