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authorJohn Garry <john.garry@huawei.com>2021-08-11 23:49:26 +0800
committerWill Deacon <will@kernel.org>2021-08-13 14:26:06 +0100
commitfac956710ab0812f9e395e9f7a27da551412830f (patch)
tree453a56763d17cbc81a975d11e7a8721d96d22e35 /drivers/iommu/arm
parent2cbeaf3f36eb300cae1f344e125162c42fb091a3 (diff)
iommu/arm-smmu-v3: Stop pre-zeroing batch commands
Pre-zeroing the batched commands structure is inefficient, as individual commands are zeroed later in arm_smmu_cmdq_build_cmd(). The size is quite large and commonly most commands won't even be used: struct arm_smmu_cmdq_batch cmds = {}; 345c: 52800001 mov w1, #0x0 // #0 3460: d2808102 mov x2, #0x408 // #1032 3464: 910143a0 add x0, x29, #0x50 3468: 94000000 bl 0 <memset> Stop pre-zeroing the complete structure and only zero the num member. Signed-off-by: John Garry <john.garry@huawei.com> Link: https://lore.kernel.org/r/1628696966-88386-1-git-send-email-john.garry@huawei.com Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/iommu/arm')
-rw-r--r--drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 283bfad5f28f..3216e746c28a 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -955,7 +955,7 @@ static void arm_smmu_sync_cd(struct arm_smmu_domain *smmu_domain,
size_t i;
unsigned long flags;
struct arm_smmu_master *master;
- struct arm_smmu_cmdq_batch cmds = {};
+ struct arm_smmu_cmdq_batch cmds;
struct arm_smmu_device *smmu = smmu_domain->smmu;
struct arm_smmu_cmdq_ent cmd = {
.opcode = CMDQ_OP_CFGI_CD,
@@ -965,6 +965,8 @@ static void arm_smmu_sync_cd(struct arm_smmu_domain *smmu_domain,
},
};
+ cmds.num = 0;
+
spin_lock_irqsave(&smmu_domain->devices_lock, flags);
list_for_each_entry(master, &smmu_domain->devices, domain_head) {
for (i = 0; i < master->num_streams; i++) {
@@ -1781,7 +1783,7 @@ int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,
unsigned long flags;
struct arm_smmu_cmdq_ent cmd;
struct arm_smmu_master *master;
- struct arm_smmu_cmdq_batch cmds = {};
+ struct arm_smmu_cmdq_batch cmds;
if (!(smmu_domain->smmu->features & ARM_SMMU_FEAT_ATS))
return 0;
@@ -1805,6 +1807,8 @@ int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,
arm_smmu_atc_inv_to_cmd(ssid, iova, size, &cmd);
+ cmds.num = 0;
+
spin_lock_irqsave(&smmu_domain->devices_lock, flags);
list_for_each_entry(master, &smmu_domain->devices, domain_head) {
if (!master->ats_enabled)
@@ -1852,7 +1856,7 @@ static void __arm_smmu_tlb_inv_range(struct arm_smmu_cmdq_ent *cmd,
struct arm_smmu_device *smmu = smmu_domain->smmu;
unsigned long end = iova + size, num_pages = 0, tg = 0;
size_t inv_range = granule;
- struct arm_smmu_cmdq_batch cmds = {};
+ struct arm_smmu_cmdq_batch cmds;
if (!size)
return;
@@ -1870,6 +1874,8 @@ static void __arm_smmu_tlb_inv_range(struct arm_smmu_cmdq_ent *cmd,
num_pages = size >> tg;
}
+ cmds.num = 0;
+
while (iova < end) {
if (smmu->features & ARM_SMMU_FEAT_RANGE_INV) {
/*