diff options
| author | Marc Zyngier <maz@kernel.org> | 2020-03-04 23:33:10 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-03-19 14:21:58 +0300 |
| commit | f3a059219bc718ccc3bf3ff894f089b7e9a93139 (patch) | |
| tree | 31f4943e6b75e03a7b7e7a90890ee4f9ff8a3e84 /include/linux/irqchip | |
| parent | 28d160de5194c68ff534443d2a8b6f1d10d57c58 (diff) | |
| download | linux-f3a059219bc718ccc3bf3ff894f089b7e9a93139.tar.xz | |
irqchip/gic-v4.1: Ensure mutual exclusion between vPE affinity change and RD access
Before GICv4.1, all operations would be serialized with the affinity
changes by virtue of using the same ITS command queue. With v4.1, things
change, as invalidations (and a number of other operations) are issued
using the redistributor MMIO frame.
We must thus make sure that these redistributor accesses cannot race
against aginst the affinity change, or we may end-up talking to the
wrong redistributor.
To ensure this, we expand the irq_to_cpuid() helper to take a spinlock
when the LPI is mapped to a vLPI (a new per-VPE lock) on each operation
that requires mutual exclusion.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/20200304203330.4967-4-maz@kernel.org
Diffstat (limited to 'include/linux/irqchip')
| -rw-r--r-- | include/linux/irqchip/arm-gic-v4.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/irqchip/arm-gic-v4.h b/include/linux/irqchip/arm-gic-v4.h index d9c34968467a..439963f4c66a 100644 --- a/include/linux/irqchip/arm-gic-v4.h +++ b/include/linux/irqchip/arm-gic-v4.h @@ -54,6 +54,11 @@ struct its_vpe { }; /* + * Ensures mutual exclusion between affinity setting of the + * vPE and vLPI operations using vpe->col_idx. + */ + raw_spinlock_t vpe_lock; + /* * This collection ID is used to indirect the target * redistributor for this VPE. The ID itself isn't involved in * programming of the ITS. |