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iommu/amd: Use atomic64_inc_return() in iommu.c

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Use atomic64_inc_return(&ref) instead of atomic64_add_return(1, &ref)
to use optimized implementation and ease register pressure around
the primitive for targets that implement optimized variant.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc: Will Deacon <will@kernel.org>
Cc: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20241007084356.47799-1-ubizjak@gmail.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Uros Bizjak 2024-10-07 10:43:31 +02:00 committed by Joerg Roedel
parent 8e929cb546
commit 5ce73c524f
1 changed files with 2 additions and 2 deletions
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4
drivers/iommu/amd/iommu.c
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@ -1230,7 +1230,7 @@ static int iommu_completion_wait(struct amd_iommu *iommu)
if (!iommu->need_sync)
return 0;
data = atomic64_add_return(1, &iommu->cmd_sem_val);
data = atomic64_inc_return(&iommu->cmd_sem_val);
build_completion_wait(&cmd, iommu, data);
raw_spin_lock_irqsave(&iommu->lock, flags);
@ -2890,7 +2890,7 @@ static void iommu_flush_irt_and_complete(struct amd_iommu *iommu, u16 devid)
return;
build_inv_irt(&cmd, devid);
data = atomic64_add_return(1, &iommu->cmd_sem_val);
data = atomic64_inc_return(&iommu->cmd_sem_val);
build_completion_wait(&cmd2, iommu, data);
raw_spin_lock_irqsave(&iommu->lock, flags);