Re: [PATCHv3] iommu/arm-smmu: Optimize ->tlb_flush_walk() for qcom implementation

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Hi Robin, Will,

On 2021-07-12 09:39, Sai Prakash Ranjan wrote:
Hi Robin,

On 2021-06-23 19:12, Sai Prakash Ranjan wrote:
Currently for iommu_unmap() of large scatter-gather list with page size elements, the majority of time is spent in flushing of partial walks in
__arm_lpae_unmap() which is a VA based TLB invalidation invalidating
page-by-page on iommus like arm-smmu-v2 (TLBIVA).

For example: to unmap a 32MB scatter-gather list with page size elements (8192 entries), there are 16->2MB buffer unmaps based on the pgsize (2MB for 4K granule) and each of 2MB will further result in 512 TLBIVAs (2MB/4K) resulting in a total of 8192 TLBIVAs (512*16) for 16->2MB causing a huge
overhead.

On qcom implementation, there are several performance improvements for
TLB cache invalidations in HW like wait-for-safe (for realtime clients
such as camera and display) and few others to allow for cache
lookups/updates when TLBI is in progress for the same context bank.
So the cost of over-invalidation is less compared to the unmap latency
on several usecases like camera which deals with large buffers. So,
ASID based TLB invalidations (TLBIASID) can be used to invalidate the
entire context for partial walk flush thereby improving the unmap
latency.

Non-strict mode can use this by default for all platforms given its
all about over-invalidation saving time on individual unmaps and
non-deterministic generally.

For this example of 32MB scatter-gather list unmap, this change results
in just 16 ASID based TLB invalidations (TLBIASIDs) as opposed to 8192
TLBIVAs thereby increasing the performance of unmaps drastically.

Test on QTI SM8150 SoC for 10 iterations of iommu_{map_sg}/unmap:
(average over 10 iterations)

Before this optimization:

    size        iommu_map_sg      iommu_unmap
      4K            2.067 us         1.854 us
     64K            9.598 us         8.802 us
      1M          148.890 us       130.718 us
      2M          305.864 us        67.291 us
     12M         1793.604 us       390.838 us
     16M         2386.848 us       518.187 us
     24M         3563.296 us       775.989 us
     32M         4747.171 us      1033.364 us

After this optimization:

    size        iommu_map_sg      iommu_unmap
      4K            1.723 us         1.765 us
     64K            9.880 us         8.869 us
      1M          155.364 us       135.223 us
      2M          303.906 us         5.385 us
     12M         1786.557 us        21.250 us
     16M         2391.890 us        27.437 us
     24M         3570.895 us        39.937 us
     32M         4755.234 us        51.797 us

This is further reduced once the map/unmap_pages() support gets in which
will result in just 1 TLBIASID as compared to 16 TLBIASIDs.

Real world data also shows big difference in unmap performance as below:

There were reports of camera frame drops because of high overhead in
iommu unmap without this optimization because of frequent unmaps issued by camera of about 100MB/s taking more than 100ms thereby causing frame
drops.

Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@xxxxxxxxxxxxxx>
---

Changes in v3:
 * Move the logic to arm-smmu driver from io-pgtable (Robin)
 * Use a new set of iommu_flush_ops->arm_smmu_s1_tlb_impl_ops and use
it for qcom impl

Changes in v2:
 * Add a quirk to choose tlb_flush_all in partial walk flush
 * Set the quirk for QTI SoC implementation

---
 drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 13 +++++++++++++
 drivers/iommu/arm/arm-smmu/arm-smmu.c      | 17 ++++++++++++++++-
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index 7771d40176de..218c71465819 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
@@ -10,6 +10,8 @@

 #include "arm-smmu.h"

+extern const struct iommu_flush_ops arm_smmu_s1_tlb_impl_ops;
+
 struct qcom_smmu {
 	struct arm_smmu_device smmu;
 	bool bypass_quirk;
@@ -146,6 +148,8 @@ static int qcom_adreno_smmu_init_context(struct
arm_smmu_domain *smmu_domain,
 {
 	struct adreno_smmu_priv *priv;

+	pgtbl_cfg->tlb = &arm_smmu_s1_tlb_impl_ops;
+
 	/* Only enable split pagetables for the GPU device (SID 0) */
 	if (!qcom_adreno_smmu_is_gpu_device(dev))
 		return 0;
@@ -185,6 +189,14 @@ static const struct of_device_id
qcom_smmu_client_of_match[] __maybe_unused = {
 	{ }
 };

+static int qcom_smmu_init_context(struct arm_smmu_domain *smmu_domain,
+		struct io_pgtable_cfg *pgtbl_cfg, struct device *dev)
+{
+	pgtbl_cfg->tlb = &arm_smmu_s1_tlb_impl_ops;
+
+	return 0;
+}
+
 static int qcom_smmu_cfg_probe(struct arm_smmu_device *smmu)
 {
unsigned int last_s2cr = ARM_SMMU_GR0_S2CR(smmu->num_mapping_groups - 1); @@ -308,6 +320,7 @@ static int qcom_smmu500_reset(struct arm_smmu_device *smmu)
 }

 static const struct arm_smmu_impl qcom_smmu_impl = {
+	.init_context = qcom_smmu_init_context,
 	.cfg_probe = qcom_smmu_cfg_probe,
 	.def_domain_type = qcom_smmu_def_domain_type,
 	.reset = qcom_smmu500_reset,
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c
b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index d3c6f54110a5..f3845e822565 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -341,6 +341,12 @@ static void arm_smmu_tlb_add_page_s1(struct
iommu_iotlb_gather *gather,
 				  ARM_SMMU_CB_S1_TLBIVAL);
 }

+static void arm_smmu_tlb_inv_walk_impl_s1(unsigned long iova, size_t size,
+				     size_t granule, void *cookie)
+{
+	arm_smmu_tlb_inv_context_s1(cookie);
+}
+
 static void arm_smmu_tlb_inv_walk_s2(unsigned long iova, size_t size,
 				     size_t granule, void *cookie)
 {
@@ -388,6 +394,12 @@ static const struct iommu_flush_ops arm_smmu_s1_tlb_ops = {
 	.tlb_add_page	= arm_smmu_tlb_add_page_s1,
 };

+const struct iommu_flush_ops arm_smmu_s1_tlb_impl_ops = {
+	.tlb_flush_all	= arm_smmu_tlb_inv_context_s1,
+	.tlb_flush_walk	= arm_smmu_tlb_inv_walk_impl_s1,
+	.tlb_add_page	= arm_smmu_tlb_add_page_s1,
+};
+
 static const struct iommu_flush_ops arm_smmu_s2_tlb_ops_v2 = {
 	.tlb_flush_all	= arm_smmu_tlb_inv_context_s2,
 	.tlb_flush_walk	= arm_smmu_tlb_inv_walk_s2,
@@ -703,7 +715,10 @@ static int arm_smmu_init_domain_context(struct
iommu_domain *domain,
 			ias = min(ias, 32UL);
 			oas = min(oas, 32UL);
 		}
-		smmu_domain->flush_ops = &arm_smmu_s1_tlb_ops;
+		if (!iommu_get_dma_strict(domain))
+			smmu_domain->flush_ops = &arm_smmu_s1_tlb_impl_ops;
+		else
+			smmu_domain->flush_ops = &arm_smmu_s1_tlb_ops;
 		break;
 	case ARM_SMMU_DOMAIN_NESTED:
 		/*

Any review comments on this version?


Was hoping to get this into 5.15 in case there aren't any concerns here?
Let me know if there are any concerns.

Thanks,
Sai

--
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