diff options
| author | Marc Zyngier <maz@kernel.org> | 2019-12-24 14:10:25 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-01-22 17:22:19 +0300 |
| commit | f2d834092ee276610ccb6637e5109b61fc79ab89 (patch) | |
| tree | 73b60a407ad6f96659f25010ec542718f1e8f268 /drivers/irqchip/irq-gic-v3-its.c | |
| parent | b25319d279b63781b972c4966b4082193e69afac (diff) | |
| download | linux-f2d834092ee276610ccb6637e5109b61fc79ab89.tar.xz | |
irqchip/gic-v3: Add GICv4.1 VPEID size discovery
While GICv4.0 mandates 16 bit worth of VPEIDs, GICv4.1 allows smaller
implementations to be built. Add the required glue to dynamically
compute the limit.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/20191224111055.11836-3-maz@kernel.org
Diffstat (limited to 'drivers/irqchip/irq-gic-v3-its.c')
| -rw-r--r-- | drivers/irqchip/irq-gic-v3-its.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index b704214390c0..6b0a8d6b53a3 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -121,7 +121,16 @@ struct its_node { #define ITS_ITT_ALIGN SZ_256 /* The maximum number of VPEID bits supported by VLPI commands */ -#define ITS_MAX_VPEID_BITS (16) +#define ITS_MAX_VPEID_BITS \ + ({ \ + int nvpeid = 16; \ + if (gic_rdists->has_rvpeid && \ + gic_rdists->gicd_typer2 & GICD_TYPER2_VIL) \ + nvpeid = 1 + (gic_rdists->gicd_typer2 & \ + GICD_TYPER2_VID); \ + \ + nvpeid; \ + }) #define ITS_MAX_VPEID (1 << (ITS_MAX_VPEID_BITS)) /* Convert page order to size in bytes */ |