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iommu/arm-smmu: reduce tlb sync poll retry latency

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Limit tlb sync poll retry latency to a upper limit. This reduces the
response time of tlb sync completion.

Change-Id: I7b92e216c17f5942ad01a9e9f24eff88f7608388
Signed-off-by: Prakash Gupta <guptap@codeaurora.org>
Signed-off-by: Chris Goldsworthy <cgoldswo@codeaurora.org>
This commit is contained in:
Prakash Gupta 2019-12-11 16:32:18 +05:30 • committed by Chris Goldsworthy
commit a91e14629c
1 changed files with 11 additions and 10 deletions
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21
drivers/iommu/arm-smmu.c
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@ -66,7 +66,7 @@
#define ARM_MMU500_ACR_CACHE_LOCK (1 << 26)
#define TLB_LOOP_TIMEOUT 500000 /* 500ms */
#define TLB_SPIN_COUNT 10
#define TLB_LOOP_INC_MAX 1000 /*1ms*/
#define ARM_SMMU_IMPL_DEF1(smmu) \
((smmu)->base + (6 * (1 << (smmu)->pgshift)))
@ -886,19 +886,20 @@ static void arm_smmu_domain_power_off(struct iommu_domain *domain,
static int __arm_smmu_tlb_sync(struct arm_smmu_device *smmu, int page,
int sync, int status)
{
unsigned int spin_cnt, delay;
unsigned int inc, delay;
u32 sync_inv_ack, tbu_pwr_status = -EINVAL, sync_inv_progress = -EINVAL;
u32 reg;
arm_smmu_writel(smmu, page, sync, QCOM_DUMMY_VAL);
for (delay = 1; delay < TLB_LOOP_TIMEOUT; delay *= 2) {
for (spin_cnt = TLB_SPIN_COUNT; spin_cnt > 0; spin_cnt--) {
reg = arm_smmu_readl(smmu, page, status);
if (!(reg & sTLBGSTATUS_GSACTIVE))
return 0;
cpu_relax();
}
udelay(delay);
for (delay = 1, inc = 1; delay < TLB_LOOP_TIMEOUT; delay += inc) {
reg = arm_smmu_readl(smmu, page, status);
if (!(reg & sTLBGSTATUS_GSACTIVE))
return 0;
cpu_relax();
udelay(inc);
if (inc < TLB_LOOP_INC_MAX)
inc *= 2;
}
sync_inv_ack = arm_smmu_readl(smmu,