Commit f115f3c0 authored by Zhen Lei's avatar Zhen Lei Committed by Will Deacon
Browse files

iommu/arm-smmu-v3: Decrease the queue size of evtq and priq 



Commit d25f6ead ("iommu/arm-smmu-v3: Increase maximum size of queues")
expands the cmdq queue size to improve the success rate of concurrent
command queue space allocation by multiple cores. However, this extension
does not apply to evtq and priq, because for both of them, the SMMU driver
is the consumer. Instead, memory resources are wasted. Therefore, the
queue size of evtq and priq is restored to the original setting, one page.

Fixes: d25f6ead ("iommu/arm-smmu-v3: Increase maximum size of queues")
Signed-off-by: default avatarZhen Lei <thunder.leizhen@huawei.com>
Link: https://lore.kernel.org/r/20210531123553.9602-1-thunder.leizhen@huawei.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent 9cff922b

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h

+3 −2
Original line number Diff line number Diff line
@@ -184,6 +184,7 @@ 
#else

#define Q_MAX_SZ_SHIFT			(PAGE_SHIFT + MAX_ORDER - 1)

#endif

#define Q_MIN_SZ_SHIFT			(PAGE_SHIFT)



/*

 * Stream table.
@@ -373,7 +374,7 @@ 
/* Event queue */

#define EVTQ_ENT_SZ_SHIFT		5

#define EVTQ_ENT_DWORDS			((1 << EVTQ_ENT_SZ_SHIFT) >> 3)

#define EVTQ_MAX_SZ_SHIFT		(Q_MAX_SZ_SHIFT - EVTQ_ENT_SZ_SHIFT)

#define EVTQ_MAX_SZ_SHIFT		(Q_MIN_SZ_SHIFT - EVTQ_ENT_SZ_SHIFT)



#define EVTQ_0_ID			GENMASK_ULL(7, 0)
@@ -399,7 +400,7 @@ 
/* PRI queue */

#define PRIQ_ENT_SZ_SHIFT		4

#define PRIQ_ENT_DWORDS			((1 << PRIQ_ENT_SZ_SHIFT) >> 3)

#define PRIQ_MAX_SZ_SHIFT		(Q_MAX_SZ_SHIFT - PRIQ_ENT_SZ_SHIFT)

#define PRIQ_MAX_SZ_SHIFT		(Q_MIN_SZ_SHIFT - PRIQ_ENT_SZ_SHIFT)



#define PRIQ_0_SID			GENMASK_ULL(31, 0)

#define PRIQ_0_SSID			GENMASK_ULL(51, 32)