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From: David Stevens <stevensd@chromium.org>
To: Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>,
	Sergey Senozhatsky <senozhatsky@chromium.org>,
	iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
	David Stevens <stevensd@chromium.org>
Subject: [PATCH 3/4] dma-iommu: expose a few helper functions to module
Date: Wed,  7 Jul 2021 16:55:04 +0900	[thread overview]
Message-ID: <20210707075505.2896824-4-stevensd@google.com> (raw)
In-Reply-To: <20210707075505.2896824-1-stevensd@google.com>

From: David Stevens <stevensd@chromium.org>

Expose a few helper functions from dma-iommu to the rest of the module.

Signed-off-by: David Stevens <stevensd@chromium.org>
---
 drivers/iommu/dma-iommu.c | 27 ++++++++++++++-------------
 include/linux/dma-iommu.h | 12 ++++++++++++
 2 files changed, 26 insertions(+), 13 deletions(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 98a5c566a303..48267d9f5152 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -413,7 +413,7 @@ static int dma_info_to_prot(enum dma_data_direction dir, bool coherent,
 	}
 }
 
-static dma_addr_t iommu_dma_alloc_iova(struct iommu_domain *domain,
+dma_addr_t __iommu_dma_alloc_iova(struct iommu_domain *domain,
 		size_t size, u64 dma_limit, struct device *dev)
 {
 	struct iommu_dma_cookie *cookie = domain->iova_cookie;
@@ -453,7 +453,7 @@ static dma_addr_t iommu_dma_alloc_iova(struct iommu_domain *domain,
 	return (dma_addr_t)iova << shift;
 }
 
-static void iommu_dma_free_iova(struct iommu_dma_cookie *cookie,
+void __iommu_dma_free_iova(struct iommu_dma_cookie *cookie,
 		dma_addr_t iova, size_t size, struct page *freelist)
 {
 	struct iova_domain *iovad = &cookie->iovad;
@@ -489,7 +489,7 @@ static void __iommu_dma_unmap(struct device *dev, dma_addr_t dma_addr,
 
 	if (!cookie->fq_domain)
 		iommu_iotlb_sync(domain, &iotlb_gather);
-	iommu_dma_free_iova(cookie, dma_addr, size, iotlb_gather.freelist);
+	__iommu_dma_free_iova(cookie, dma_addr, size, iotlb_gather.freelist);
 }
 
 static void __iommu_dma_unmap_swiotlb(struct device *dev, dma_addr_t dma_addr,
@@ -525,12 +525,12 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys,
 
 	size = iova_align(iovad, size + iova_off);
 
-	iova = iommu_dma_alloc_iova(domain, size, dma_mask, dev);
+	iova = __iommu_dma_alloc_iova(domain, size, dma_mask, dev);
 	if (!iova)
 		return DMA_MAPPING_ERROR;
 
 	if (iommu_map_atomic(domain, iova, phys - iova_off, size, prot)) {
-		iommu_dma_free_iova(cookie, iova, size, NULL);
+		__iommu_dma_free_iova(cookie, iova, size, NULL);
 		return DMA_MAPPING_ERROR;
 	}
 	return iova + iova_off;
@@ -585,14 +585,14 @@ static dma_addr_t __iommu_dma_map_swiotlb(struct device *dev, phys_addr_t phys,
 	return iova;
 }
 
-static void __iommu_dma_free_pages(struct page **pages, int count)
+void __iommu_dma_free_pages(struct page **pages, int count)
 {
 	while (count--)
 		__free_page(pages[count]);
 	kvfree(pages);
 }
 
-static struct page **__iommu_dma_alloc_pages(
+struct page **__iommu_dma_alloc_pages(
 		unsigned int count, unsigned long order_mask,
 		unsigned int nid, gfp_t page_gfp, gfp_t kalloc_gfp)
 {
@@ -686,7 +686,8 @@ static struct page **__iommu_dma_alloc_noncontiguous(struct device *dev,
 		return NULL;
 
 	size = iova_align(iovad, size);
-	iova = iommu_dma_alloc_iova(domain, size, dev->coherent_dma_mask, dev);
+	iova = __iommu_dma_alloc_iova(domain, size,
+				      dev->coherent_dma_mask, dev);
 	if (!iova)
 		goto out_free_pages;
 
@@ -712,7 +713,7 @@ static struct page **__iommu_dma_alloc_noncontiguous(struct device *dev,
 out_free_sg:
 	sg_free_table(sgt);
 out_free_iova:
-	iommu_dma_free_iova(cookie, iova, size, NULL);
+	__iommu_dma_free_iova(cookie, iova, size, NULL);
 out_free_pages:
 	__iommu_dma_free_pages(pages, count);
 	return NULL;
@@ -1063,7 +1064,7 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
 		prev = s;
 	}
 
-	iova = iommu_dma_alloc_iova(domain, iova_len, dma_get_mask(dev), dev);
+	iova = __iommu_dma_alloc_iova(domain, iova_len, dma_get_mask(dev), dev);
 	if (!iova)
 		goto out_restore_sg;
 
@@ -1077,7 +1078,7 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
 	return __finalise_sg(dev, sg, nents, iova);
 
 out_free_iova:
-	iommu_dma_free_iova(cookie, iova, iova_len, NULL);
+	__iommu_dma_free_iova(cookie, iova, iova_len, NULL);
 out_restore_sg:
 	__invalidate_sg(sg, nents);
 	return 0;
@@ -1370,7 +1371,7 @@ static struct iommu_dma_msi_page *iommu_dma_get_msi_page(struct device *dev,
 	if (!msi_page)
 		return NULL;
 
-	iova = iommu_dma_alloc_iova(domain, size, dma_get_mask(dev), dev);
+	iova = __iommu_dma_alloc_iova(domain, size, dma_get_mask(dev), dev);
 	if (!iova)
 		goto out_free_page;
 
@@ -1384,7 +1385,7 @@ static struct iommu_dma_msi_page *iommu_dma_get_msi_page(struct device *dev,
 	return msi_page;
 
 out_free_iova:
-	iommu_dma_free_iova(cookie, iova, size, NULL);
+	__iommu_dma_free_iova(cookie, iova, size, NULL);
 out_free_page:
 	kfree(msi_page);
 	return NULL;
diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
index 6e75a2d689b4..fc9acc581db0 100644
--- a/include/linux/dma-iommu.h
+++ b/include/linux/dma-iommu.h
@@ -42,6 +42,18 @@ void iommu_dma_free_cpu_cached_iovas(unsigned int cpu,
 
 extern bool iommu_dma_forcedac;
 
+struct iommu_dma_cookie;
+
+struct page **__iommu_dma_alloc_pages(
+		unsigned int count, unsigned long order_mask,
+		unsigned int nid, gfp_t page_gfp, gfp_t kalloc_gfp);
+void __iommu_dma_free_pages(struct page **pages, int count);
+dma_addr_t __iommu_dma_alloc_iova(struct iommu_domain *domain,
+				  size_t size, dma_addr_t dma_limit,
+				  struct device *dev);
+void __iommu_dma_free_iova(struct iommu_dma_cookie *cookie,
+		dma_addr_t iova, size_t size, struct page *freelist);
+
 #else /* CONFIG_IOMMU_DMA */
 
 struct iommu_domain;
-- 
2.32.0.93.g670b81a890-goog


  parent reply	other threads:[~2021-07-07  7:55 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-07  7:55 [PATCH 0/4] Add dynamic iommu backed bounce buffers David Stevens
2021-07-07  7:55 ` [PATCH 1/4] dma-iommu: add kalloc gfp flag to alloc helper David Stevens
2021-07-08 17:22   ` Robin Murphy
2021-07-07  7:55 ` [PATCH 2/4] dma-iommu: replace device arguments David Stevens
2021-07-07  7:55 ` David Stevens [this message]
2021-07-07  7:55 ` [PATCH 4/4] dma-iommu: Add iommu bounce buffers to dma-iommu api David Stevens
2021-07-08  9:29 ` [PATCH 0/4] Add dynamic iommu backed bounce buffers Joerg Roedel
2021-07-08 17:14   ` Robin Murphy
2021-07-09  7:25     ` David Stevens
2021-07-08 13:38 ` Lu Baolu
2021-07-09  6:04   ` David Stevens

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