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[v2,6/8] drm/etnaviv: mmu: stop using iommu map/unmap functions

Message ID 20170929143704.30635-6-l.stach@pengutronix.de (mailing list archive)
State New, archived
Headers show

Commit Message

Lucas Stach Sept. 29, 2017, 2:37 p.m. UTC 
This is a preparation to remove the etnaviv dependency on the IOMMU
subsystem by importing the relevant parts of the iommu map/unamp
functions into the driver.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-By: Wladimir J. van der Laan <laanwj@gmail.com>
---
v2: change return type of etnaviv_domain_unmap to void
---
 drivers/gpu/drm/etnaviv/etnaviv_mmu.c | 74 +++++++++++++++++++++++++++++------
 1 file changed, 61 insertions(+), 13 deletions(-)

Comments

kernel test robot Sept. 30, 2017, 7:06 a.m. UTC | #1 
Hi Lucas,

[auto build test ERROR on drm/drm-next]
[also build test ERROR on v4.14-rc2 next-20170929]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Lucas-Stach/drm-etnaviv-remove-iommu-fault-handler/20170930-080416
base:   git://people.freedesktop.org/~airlied/linux.git drm-next
config: arm-allyesconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

Note: the linux-review/Lucas-Stach/drm-etnaviv-remove-iommu-fault-handler/20170930-080416 HEAD bd98331a05ea789da46e9c1428ebffe31ca58b67 builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/etnaviv/etnaviv_mmu.c:117:6: error: conflicting types for 'etnaviv_iommu_unmap'
    void etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
         ^~~~~~~~~~~~~~~~~~~
   In file included from drivers/gpu/drm/etnaviv/etnaviv_mmu.c:23:0:
   drivers/gpu/drm/etnaviv/etnaviv_mmu.h:56:5: note: previous declaration of 'etnaviv_iommu_unmap' was here
    int etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
        ^~~~~~~~~~~~~~~~~~~

vim +/etnaviv_iommu_unmap +117 drivers/gpu/drm/etnaviv/etnaviv_mmu.c

   116	
 > 117	void etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
   118				 struct sg_table *sgt, unsigned len)
   119	{
   120		struct iommu_domain *domain = iommu->domain;
   121		struct scatterlist *sg;
   122		unsigned int da = iova;
   123		int i;
   124	
   125		for_each_sg(sgt->sgl, sg, sgt->nents, i) {
   126			size_t bytes = sg_dma_len(sg) + sg->offset;
   127	
   128			etnaviv_domain_unmap(domain, da, bytes);
   129	
   130			VERB("unmap[%d]: %08x(%zx)", i, iova, bytes);
   131	
   132			BUG_ON(!PAGE_ALIGNED(bytes));
   133	
   134			da += bytes;
   135		}
   136	}
   137	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
diff mbox

Patch

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
index f3ed07db9b2d..e7b8b7aff9c6 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
@@ -22,6 +22,59 @@ 
 #include "etnaviv_iommu.h"
 #include "etnaviv_mmu.h"
 
+static void etnaviv_domain_unmap(struct iommu_domain *domain,
+				 unsigned long iova, size_t size)
+{
+	size_t unmapped_page, unmapped = 0;
+	size_t pgsize = SZ_4K;
+
+	if (!IS_ALIGNED(iova | size, pgsize)) {
+		pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n",
+		       iova, size, pgsize);
+		return;
+	}
+
+	while (unmapped < size) {
+		unmapped_page = domain->ops->unmap(domain, iova, pgsize);
+		if (!unmapped_page)
+			break;
+
+		iova += unmapped_page;
+		unmapped += unmapped_page;
+	}
+}
+
+static int etnaviv_domain_map(struct iommu_domain *domain, unsigned long iova,
+		     phys_addr_t paddr, size_t size, int prot)
+{
+	unsigned long orig_iova = iova;
+	size_t pgsize = SZ_4K;
+	size_t orig_size = size;
+	int ret = 0;
+
+	if (!IS_ALIGNED(iova | paddr | size, pgsize)) {
+		pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n",
+		       iova, &paddr, size, pgsize);
+		return -EINVAL;
+	}
+
+	while (size) {
+		ret = domain->ops->map(domain, iova, paddr, pgsize, prot);
+		if (ret)
+			break;
+
+		iova += pgsize;
+		paddr += pgsize;
+		size -= pgsize;
+	}
+
+	/* unroll mapping in case something went wrong */
+	if (ret)
+		etnaviv_domain_unmap(domain, orig_iova, orig_size - size);
+
+	return ret;
+}
+
 int etnaviv_iommu_map(struct etnaviv_iommu *iommu, u32 iova,
 		struct sg_table *sgt, unsigned len, int prot)
 {
@@ -40,7 +93,7 @@  int etnaviv_iommu_map(struct etnaviv_iommu *iommu, u32 iova,
 
 		VERB("map[%d]: %08x %08x(%zx)", i, iova, pa, bytes);
 
-		ret = iommu_map(domain, da, pa, bytes, prot);
+		ret = etnaviv_domain_map(domain, da, pa, bytes, prot);
 		if (ret)
 			goto fail;
 
@@ -55,14 +108,14 @@  int etnaviv_iommu_map(struct etnaviv_iommu *iommu, u32 iova,
 	for_each_sg(sgt->sgl, sg, i, j) {
 		size_t bytes = sg_dma_len(sg) + sg->offset;
 
-		iommu_unmap(domain, da, bytes);
+		etnaviv_domain_unmap(domain, da, bytes);
 		da += bytes;
 	}
 	return ret;
 }
 
-int etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
-		struct sg_table *sgt, unsigned len)
+void etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
+			 struct sg_table *sgt, unsigned len)
 {
 	struct iommu_domain *domain = iommu->domain;
 	struct scatterlist *sg;
@@ -71,11 +124,8 @@  int etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
 
 	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
 		size_t bytes = sg_dma_len(sg) + sg->offset;
-		size_t unmapped;
 
-		unmapped = iommu_unmap(domain, da, bytes);
-		if (unmapped < bytes)
-			return unmapped;
+		etnaviv_domain_unmap(domain, da, bytes);
 
 		VERB("unmap[%d]: %08x(%zx)", i, iova, bytes);
 
@@ -83,8 +133,6 @@  int etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
 
 		da += bytes;
 	}
-
-	return 0;
 }
 
 static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu *mmu,
@@ -329,8 +377,8 @@  int etnaviv_iommu_get_suballoc_va(struct etnaviv_gpu *gpu, dma_addr_t paddr,
 			mutex_unlock(&mmu->lock);
 			return ret;
 		}
-		ret = iommu_map(mmu->domain, vram_node->start, paddr, size,
-				IOMMU_READ);
+		ret = etnaviv_domain_map(mmu->domain, vram_node->start, paddr,
+					 size, IOMMU_READ);
 		if (ret < 0) {
 			drm_mm_remove_node(vram_node);
 			mutex_unlock(&mmu->lock);
@@ -353,7 +401,7 @@  void etnaviv_iommu_put_suballoc_va(struct etnaviv_gpu *gpu,
 
 	if (mmu->version == ETNAVIV_IOMMU_V2) {
 		mutex_lock(&mmu->lock);
-		iommu_unmap(mmu->domain,iova, size);
+		etnaviv_domain_unmap(mmu->domain, iova, size);
 		drm_mm_remove_node(vram_node);
 		mutex_unlock(&mmu->lock);
 	}