linux-kernel - [PATCH V3] iommu: Optimize IOMMU UnMap

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Message-ID: <20240805084106.214584-1-amhetre@nvidia.com>
Date: Mon, 5 Aug 2024 08:41:06 +0000
From: Ashish Mhetre <amhetre@...dia.com>
To: <will@...nel.org>, <robin.murphy@....com>, <joro@...tes.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>, Ashish Mhetre
	<amhetre@...dia.com>
Subject: [PATCH V3] iommu: Optimize IOMMU UnMap

The current __arm_lpae_unmap() function calls dma_sync() on individual
PTEs after clearing them. Overall unmap performance can be improved by
around 25% for large buffer sizes by combining the syncs for adjacent
leaf entries.
Optimize the unmap time by clearing all the leaf entries and issuing a
single dma_sync() for them.
Below is detailed analysis of average unmap latency(in us) with and
without this optimization obtained by running dma_map_benchmark for
different buffer sizes.

		UnMap Latency(us)
Size	Without		With		% gain with
	optimiztion	optimization	optimization

4KB	3		3		0
8KB	4		3.8		5
16KB	6.1		5.4		11.48
32KB	10.2		8.5		16.67
64KB	18.5		14.9		19.46
128KB	35		27.5		21.43
256KB	67.5		52.2		22.67
512KB	127.9		97.2		24.00
1MB	248.6		187.4		24.62
2MB	65.5		65.5		0
4MB	119.2		119		0.17

Signed-off-by: Ashish Mhetre <amhetre@...dia.com>
---
Changes in V2:
- Updated the commit message to be imperative.
- Fixed ptep at incorrect index getting cleared for non-leaf entries.

Changes in V3:
- Used loop-local variables and removed redundant function variables.
- Added check for zero-sized dma_sync in __arm_lpae_clear_pte().
- Merged both patches into this single patch by adding check for a
  NULL gather in __arm_lpae_unmap() itself.
---
 drivers/iommu/io-pgtable-arm.c | 31 +++++++++++++++++--------------
 1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index f5d9fd1f45bf..6fecf3d9fe67 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -274,13 +274,13 @@ static void __arm_lpae_sync_pte(arm_lpae_iopte *ptep, int num_entries,
 				   sizeof(*ptep) * num_entries, DMA_TO_DEVICE);
 }
 
-static void __arm_lpae_clear_pte(arm_lpae_iopte *ptep, struct io_pgtable_cfg *cfg)
+static void __arm_lpae_clear_pte(arm_lpae_iopte *ptep, struct io_pgtable_cfg *cfg, int num_entries)
 {
+	for (int i = 0; i < num_entries; i++)
+		ptep[i] = 0;
 
-	*ptep = 0;
-
-	if (!cfg->coherent_walk)
-		__arm_lpae_sync_pte(ptep, 1, cfg);
+	if (!cfg->coherent_walk && num_entries)
+		__arm_lpae_sync_pte(ptep, num_entries, cfg);
 }
 
 static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
@@ -654,26 +654,29 @@ static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
 		max_entries = ARM_LPAE_PTES_PER_TABLE(data) - unmap_idx_start;
 		num_entries = min_t(int, pgcount, max_entries);
 
-		while (i < num_entries) {
-			pte = READ_ONCE(*ptep);
+		/* Find and handle non-leaf entries */
+		for (i = 0; i < num_entries; i++) {
+			pte = READ_ONCE(ptep[i]);
 			if (WARN_ON(!pte))
 				break;
 
-			__arm_lpae_clear_pte(ptep, &iop->cfg);
-
 			if (!iopte_leaf(pte, lvl, iop->fmt)) {
+				__arm_lpae_clear_pte(&ptep[i], &iop->cfg, 1);
+
 				/* Also flush any partial walks */
 				io_pgtable_tlb_flush_walk(iop, iova + i * size, size,
 							  ARM_LPAE_GRANULE(data));
 				__arm_lpae_free_pgtable(data, lvl + 1, iopte_deref(pte, data));
-			} else if (!iommu_iotlb_gather_queued(gather)) {
-				io_pgtable_tlb_add_page(iop, gather, iova + i * size, size);
 			}
-
-			ptep++;
-			i++;
 		}
 
+		/* Clear the remaining entries */
+		__arm_lpae_clear_pte(ptep, &iop->cfg, i);
+
+		if (gather && !iommu_iotlb_gather_queued(gather))
+			for (int j = 0; j < i; j++)
+				io_pgtable_tlb_add_page(iop, gather, iova + j * size, size);
+
 		return i * size;
 	} else if (iopte_leaf(pte, lvl, iop->fmt)) {
 		/*
-- 
2.25.1