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From: Tom Murphy <murphyt7@tcd.ie>
To: iommu@lists.linux-foundation.org
Cc: Tom Murphy <murphyt7@tcd.ie>, Joerg Roedel <joro@8bytes.org>,
	Will Deacon <will.deacon@arm.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Kukjin Kim <kgene@kernel.org>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	David Woodhouse <dwmw2@infradead.org>,
	Andy Gross <agross@kernel.org>,
	David Brown <david.brown@linaro.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Rob Clark <robdclark@gmail.com>, Heiko Stuebner <heiko@sntech.de>,
	Gerald Schaefer <gerald.schaefer@de.ibm.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	Jean-Philippe Brucker <jean-philippe.brucker@arm.com>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	linux-mediatek@lists.infradead.org,
	linux-rockchip@lists.infradead.org, linux-s390@vger.kernel.org,
	linux-tegra@vger.kernel.org,
	virtualization@lists.linux-foundation.org
Subject: [PATCH v4 1/5] iommu/amd: Remove unnecessary locking from AMD iommu driver
Date: Thu, 13 Jun 2019 23:38:56 +0100
Message-ID: <20190613223901.9523-2-murphyt7@tcd.ie> (raw)
In-Reply-To: <20190613223901.9523-1-murphyt7@tcd.ie>

We can remove the mutex lock from amd_iommu_map and amd_iommu_unmap.
iommu_map doesn’t lock while mapping and so no two calls should touch
the same iova range. The AMD driver already handles the page table page
allocations without locks so we can safely remove the locks.

Signed-off-by: Tom Murphy <murphyt7@tcd.ie>
---
 drivers/iommu/amd_iommu.c       | 10 +---------
 drivers/iommu/amd_iommu_types.h |  1 -
 2 files changed, 1 insertion(+), 10 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 73740b969e62..065639e090fe 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2858,7 +2858,6 @@ static void protection_domain_free(struct protection_domain *domain)
 static int protection_domain_init(struct protection_domain *domain)
 {
 	spin_lock_init(&domain->lock);
-	mutex_init(&domain->api_lock);
 	domain->id = domain_id_alloc();
 	if (!domain->id)
 		return -ENOMEM;
@@ -3045,9 +3044,7 @@ static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova,
 	if (iommu_prot & IOMMU_WRITE)
 		prot |= IOMMU_PROT_IW;
 
-	mutex_lock(&domain->api_lock);
 	ret = iommu_map_page(domain, iova, paddr, page_size, prot, GFP_KERNEL);
-	mutex_unlock(&domain->api_lock);
 
 	domain_flush_np_cache(domain, iova, page_size);
 
@@ -3058,16 +3055,11 @@ static size_t amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova,
 			   size_t page_size)
 {
 	struct protection_domain *domain = to_pdomain(dom);
-	size_t unmap_size;
 
 	if (domain->mode == PAGE_MODE_NONE)
 		return 0;
 
-	mutex_lock(&domain->api_lock);
-	unmap_size = iommu_unmap_page(domain, iova, page_size);
-	mutex_unlock(&domain->api_lock);
-
-	return unmap_size;
+	return iommu_unmap_page(domain, iova, page_size);
 }
 
 static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index 52c35d557fad..5d5f5d009b19 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -461,7 +461,6 @@ struct protection_domain {
 	struct iommu_domain domain; /* generic domain handle used by
 				       iommu core code */
 	spinlock_t lock;	/* mostly used to lock the page table*/
-	struct mutex api_lock;	/* protect page tables in the iommu-api path */
 	u16 id;			/* the domain id written to the device table */
 	int mode;		/* paging mode (0-6 levels) */
 	u64 *pt_root;		/* page table root pointer */
-- 
2.20.1


  reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-13 22:38 [PATCH v4 0/5] iommu/amd: Convert the AMD iommu driver to the dma-iommu api Tom Murphy
2019-06-13 22:38 ` Tom Murphy [this message]
2019-06-13 22:38 ` [PATCH v4 2/5] iommu: Add gfp parameter to iommu_ops::map Tom Murphy
2019-06-13 22:38 ` [PATCH v4 3/5] iommu/dma-iommu: Handle deferred devices Tom Murphy
2019-06-13 22:38 ` [PATCH v4 4/5] iommu/dma-iommu: Use the dev->coherent_dma_mask Tom Murphy
2019-06-13 22:39 ` [PATCH v4 5/5] iommu/amd: Convert AMD iommu driver to the dma-iommu api Tom Murphy
2019-06-24  6:19 ` [PATCH v4 0/5] iommu/amd: Convert the " Christoph Hellwig
2019-07-01 12:19   ` Joerg Roedel
2019-08-10  7:19   ` Christoph Hellwig
     [not found]     ` <CALQxJuvxBc3MH3_B_fZ3FvURHOM3F3dvvZ6x=GtALUAvyu7Qxw@mail.gmail.com>
2019-08-13 13:07       ` Christoph Hellwig
2019-08-15 11:13         ` Tom Murphy

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