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From: Lu Baolu <baolu.lu@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>
Cc: Tina Zhang <tina.zhang@intel.com>,
	Sanjay K Kumar <sanjay.k.kumar@intel.com>,
	iommu@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: [PATCH 14/14] iommu/vt-d: Introduce batched cache invalidation
Date: Mon,  2 Sep 2024 10:27:24 +0800	[thread overview]
Message-ID: <20240902022724.67059-15-baolu.lu@linux.intel.com> (raw)
In-Reply-To: <20240902022724.67059-1-baolu.lu@linux.intel.com>

From: Tina Zhang <tina.zhang@intel.com>

Converts IOTLB and Dev-IOTLB invalidation to a batched model. Cache tag
invalidation requests for a domain are now accumulated in a qi_batch
structure before being flushed in bulk. It replaces the previous per-
request qi_flush approach with a more efficient batching mechanism.

Co-developed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Tina Zhang <tina.zhang@intel.com>
Link: https://lore.kernel.org/r/20240815065221.50328-5-tina.zhang@intel.com
---
 drivers/iommu/intel/cache.c | 122 +++++++++++++++++++++++++++++++-----
 1 file changed, 107 insertions(+), 15 deletions(-)

diff --git a/drivers/iommu/intel/cache.c b/drivers/iommu/intel/cache.c
index 2e997d782beb..e5b89f728ad3 100644
--- a/drivers/iommu/intel/cache.c
+++ b/drivers/iommu/intel/cache.c
@@ -262,6 +262,79 @@ static unsigned long calculate_psi_aligned_address(unsigned long start,
 	return ALIGN_DOWN(start, VTD_PAGE_SIZE << mask);
 }
 
+static void qi_batch_flush_descs(struct intel_iommu *iommu, struct qi_batch *batch)
+{
+	if (!iommu || !batch->index)
+		return;
+
+	qi_submit_sync(iommu, batch->descs, batch->index, 0);
+
+	/* Reset the index value and clean the whole batch buffer. */
+	memset(batch, 0, sizeof(*batch));
+}
+
+static void qi_batch_increment_index(struct intel_iommu *iommu, struct qi_batch *batch)
+{
+	if (++batch->index == QI_MAX_BATCHED_DESC_COUNT)
+		qi_batch_flush_descs(iommu, batch);
+}
+
+static void qi_batch_add_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
+			       unsigned int size_order, u64 type,
+			       struct qi_batch *batch)
+{
+	qi_desc_iotlb(iommu, did, addr, size_order, type, &batch->descs[batch->index]);
+	qi_batch_increment_index(iommu, batch);
+}
+
+static void qi_batch_add_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
+				   u16 qdep, u64 addr, unsigned int mask,
+				   struct qi_batch *batch)
+{
+	/*
+	 * According to VT-d spec, software is recommended to not submit any Device-TLB
+	 * invalidation requests while address remapping hardware is disabled.
+	 */
+	if (!(iommu->gcmd & DMA_GCMD_TE))
+		return;
+
+	qi_desc_dev_iotlb(sid, pfsid, qdep, addr, mask, &batch->descs[batch->index]);
+	qi_batch_increment_index(iommu, batch);
+}
+
+static void qi_batch_add_piotlb(struct intel_iommu *iommu, u16 did, u32 pasid,
+				u64 addr, unsigned long npages, bool ih,
+				struct qi_batch *batch)
+{
+	/*
+	 * npages == -1 means a PASID-selective invalidation, otherwise,
+	 * a positive value for Page-selective-within-PASID invalidation.
+	 * 0 is not a valid input.
+	 */
+	if (!npages)
+		return;
+
+	qi_desc_piotlb(did, pasid, addr, npages, ih, &batch->descs[batch->index]);
+	qi_batch_increment_index(iommu, batch);
+}
+
+static void qi_batch_add_pasid_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
+					 u32 pasid,  u16 qdep, u64 addr,
+					 unsigned int size_order, struct qi_batch *batch)
+{
+	/*
+	 * According to VT-d spec, software is recommended to not submit any
+	 * Device-TLB invalidation requests while address remapping hardware
+	 * is disabled.
+	 */
+	if (!(iommu->gcmd & DMA_GCMD_TE))
+		return;
+
+	qi_desc_dev_iotlb_pasid(sid, pfsid, pasid, qdep, addr, size_order,
+				&batch->descs[batch->index]);
+	qi_batch_increment_index(iommu, batch);
+}
+
 static void cache_tag_flush_iotlb(struct dmar_domain *domain, struct cache_tag *tag,
 				  unsigned long addr, unsigned long pages,
 				  unsigned long mask, int ih)
@@ -270,7 +343,8 @@ static void cache_tag_flush_iotlb(struct dmar_domain *domain, struct cache_tag *
 	u64 type = DMA_TLB_PSI_FLUSH;
 
 	if (domain->use_first_level) {
-		qi_flush_piotlb(iommu, tag->domain_id, tag->pasid, addr, pages, ih);
+		qi_batch_add_piotlb(iommu, tag->domain_id, tag->pasid, addr,
+				    pages, ih, domain->qi_batch);
 		return;
 	}
 
@@ -287,7 +361,8 @@ static void cache_tag_flush_iotlb(struct dmar_domain *domain, struct cache_tag *
 	}
 
 	if (ecap_qis(iommu->ecap))
-		qi_flush_iotlb(iommu, tag->domain_id, addr | ih, mask, type);
+		qi_batch_add_iotlb(iommu, tag->domain_id, addr | ih, mask, type,
+				   domain->qi_batch);
 	else
 		__iommu_flush_iotlb(iommu, tag->domain_id, addr | ih, mask, type);
 }
@@ -303,19 +378,20 @@ static void cache_tag_flush_devtlb_psi(struct dmar_domain *domain, struct cache_
 	sid = PCI_DEVID(info->bus, info->devfn);
 
 	if (tag->pasid == IOMMU_NO_PASID) {
-		qi_flush_dev_iotlb(iommu, sid, info->pfsid, info->ats_qdep,
-				   addr, mask);
+		qi_batch_add_dev_iotlb(iommu, sid, info->pfsid, info->ats_qdep,
+				       addr, mask, domain->qi_batch);
 		if (info->dtlb_extra_inval)
-			qi_flush_dev_iotlb(iommu, sid, info->pfsid,
-					   info->ats_qdep, addr, mask);
+			qi_batch_add_dev_iotlb(iommu, sid, info->pfsid, info->ats_qdep,
+					       addr, mask, domain->qi_batch);
 		return;
 	}
 
-	qi_flush_dev_iotlb_pasid(iommu, sid, info->pfsid, tag->pasid,
-				 info->ats_qdep, addr, mask);
+	qi_batch_add_pasid_dev_iotlb(iommu, sid, info->pfsid, tag->pasid,
+				     info->ats_qdep, addr, mask, domain->qi_batch);
 	if (info->dtlb_extra_inval)
-		qi_flush_dev_iotlb_pasid(iommu, sid, info->pfsid, tag->pasid,
-					 info->ats_qdep, addr, mask);
+		qi_batch_add_pasid_dev_iotlb(iommu, sid, info->pfsid, tag->pasid,
+					     info->ats_qdep, addr, mask,
+					     domain->qi_batch);
 }
 
 static void cache_tag_flush_devtlb_all(struct dmar_domain *domain, struct cache_tag *tag)
@@ -327,11 +403,11 @@ static void cache_tag_flush_devtlb_all(struct dmar_domain *domain, struct cache_
 	info = dev_iommu_priv_get(tag->dev);
 	sid = PCI_DEVID(info->bus, info->devfn);
 
-	qi_flush_dev_iotlb(iommu, sid, info->pfsid, info->ats_qdep, 0,
-			   MAX_AGAW_PFN_WIDTH);
+	qi_batch_add_dev_iotlb(iommu, sid, info->pfsid, info->ats_qdep, 0,
+			       MAX_AGAW_PFN_WIDTH, domain->qi_batch);
 	if (info->dtlb_extra_inval)
-		qi_flush_dev_iotlb(iommu, sid, info->pfsid, info->ats_qdep, 0,
-				   MAX_AGAW_PFN_WIDTH);
+		qi_batch_add_dev_iotlb(iommu, sid, info->pfsid, info->ats_qdep, 0,
+				       MAX_AGAW_PFN_WIDTH, domain->qi_batch);
 }
 
 /*
@@ -341,6 +417,7 @@ static void cache_tag_flush_devtlb_all(struct dmar_domain *domain, struct cache_
 void cache_tag_flush_range(struct dmar_domain *domain, unsigned long start,
 			   unsigned long end, int ih)
 {
+	struct intel_iommu *iommu = NULL;
 	unsigned long pages, mask, addr;
 	struct cache_tag *tag;
 	unsigned long flags;
@@ -349,6 +426,10 @@ void cache_tag_flush_range(struct dmar_domain *domain, unsigned long start,
 
 	spin_lock_irqsave(&domain->cache_lock, flags);
 	list_for_each_entry(tag, &domain->cache_tags, node) {
+		if (iommu && iommu != tag->iommu)
+			qi_batch_flush_descs(iommu, domain->qi_batch);
+		iommu = tag->iommu;
+
 		switch (tag->type) {
 		case CACHE_TAG_IOTLB:
 		case CACHE_TAG_NESTING_IOTLB:
@@ -372,6 +453,7 @@ void cache_tag_flush_range(struct dmar_domain *domain, unsigned long start,
 
 		trace_cache_tag_flush_range(tag, start, end, addr, pages, mask);
 	}
+	qi_batch_flush_descs(iommu, domain->qi_batch);
 	spin_unlock_irqrestore(&domain->cache_lock, flags);
 }
 
@@ -381,11 +463,16 @@ void cache_tag_flush_range(struct dmar_domain *domain, unsigned long start,
  */
 void cache_tag_flush_all(struct dmar_domain *domain)
 {
+	struct intel_iommu *iommu = NULL;
 	struct cache_tag *tag;
 	unsigned long flags;
 
 	spin_lock_irqsave(&domain->cache_lock, flags);
 	list_for_each_entry(tag, &domain->cache_tags, node) {
+		if (iommu && iommu != tag->iommu)
+			qi_batch_flush_descs(iommu, domain->qi_batch);
+		iommu = tag->iommu;
+
 		switch (tag->type) {
 		case CACHE_TAG_IOTLB:
 		case CACHE_TAG_NESTING_IOTLB:
@@ -399,6 +486,7 @@ void cache_tag_flush_all(struct dmar_domain *domain)
 
 		trace_cache_tag_flush_all(tag);
 	}
+	qi_batch_flush_descs(iommu, domain->qi_batch);
 	spin_unlock_irqrestore(&domain->cache_lock, flags);
 }
 
@@ -416,6 +504,7 @@ void cache_tag_flush_all(struct dmar_domain *domain)
 void cache_tag_flush_range_np(struct dmar_domain *domain, unsigned long start,
 			      unsigned long end)
 {
+	struct intel_iommu *iommu = NULL;
 	unsigned long pages, mask, addr;
 	struct cache_tag *tag;
 	unsigned long flags;
@@ -424,7 +513,9 @@ void cache_tag_flush_range_np(struct dmar_domain *domain, unsigned long start,
 
 	spin_lock_irqsave(&domain->cache_lock, flags);
 	list_for_each_entry(tag, &domain->cache_tags, node) {
-		struct intel_iommu *iommu = tag->iommu;
+		if (iommu && iommu != tag->iommu)
+			qi_batch_flush_descs(iommu, domain->qi_batch);
+		iommu = tag->iommu;
 
 		if (!cap_caching_mode(iommu->cap) || domain->use_first_level) {
 			iommu_flush_write_buffer(iommu);
@@ -437,5 +528,6 @@ void cache_tag_flush_range_np(struct dmar_domain *domain, unsigned long start,
 
 		trace_cache_tag_flush_range_np(tag, start, end, addr, pages, mask);
 	}
+	qi_batch_flush_descs(iommu, domain->qi_batch);
 	spin_unlock_irqrestore(&domain->cache_lock, flags);
 }
-- 
2.34.1


  parent reply	other threads:[~2024-09-02  2:31 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-09-02  2:27 [PATCH 00/14] [PULL REQUEST] Intel IOMMU updates for v6.12 Lu Baolu
2024-09-02  2:27 ` [PATCH 01/14] iommu/vt-d: Require DMA domain if hardware not support passthrough Lu Baolu
2024-09-02  2:27 ` [PATCH 02/14] iommu/vt-d: Remove identity mappings from si_domain Lu Baolu
2024-09-02  2:27 ` [PATCH 03/14] iommu/vt-d: Always reserve a domain ID for identity setup Lu Baolu
2024-09-02  2:27 ` [PATCH 04/14] iommu/vt-d: Remove has_iotlb_device flag Lu Baolu
2024-09-02  2:27 ` [PATCH 05/14] iommu/vt-d: Factor out helpers from domain_context_mapping_one() Lu Baolu
2024-09-02  2:27 ` [PATCH 06/14] iommu/vt-d: Add support for static identity domain Lu Baolu
2024-09-02  2:27 ` [PATCH 07/14] iommu/vt-d: Cleanup si_domain Lu Baolu
2024-09-02  2:27 ` [PATCH 08/14] iommu/vt-d: Fix potential lockup if qi_submit_sync called with 0 count Lu Baolu
2024-09-02  2:27 ` [PATCH 09/14] iommu/vt-d: Move PCI PASID enablement to probe path Lu Baolu
2024-09-02  2:27 ` [PATCH 10/14] iommu/vt-d: Unconditionally flush device TLB for pasid table updates Lu Baolu
2024-09-02  2:27 ` [PATCH 11/14] iommu/vt-d: Factor out invalidation descriptor composition Lu Baolu
2024-09-02  2:27 ` [PATCH 12/14] iommu/vt-d: Refactor IOTLB and Dev-IOTLB flush for batching Lu Baolu
2024-09-02  2:27 ` [PATCH 13/14] iommu/vt-d: Add qi_batch for dmar_domain Lu Baolu
2024-09-02  2:27 ` Lu Baolu [this message]
2024-09-02 16:15 ` [PATCH 00/14] [PULL REQUEST] Intel IOMMU updates for v6.12 Joerg Roedel

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