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From:   Christoph Hellwig <hch@lst.de>
To:     Andrew Morton <akpm@linux-foundation.org>,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
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        Laura Abbott <labbott@redhat.com>,
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        Minchan Kim <minchan@kernel.org>,
        Nitin Gupta <ngupta@vflare.org>
Cc:     Robin Murphy <robin.murphy@arm.com>,
        Christophe Leroy <christophe.leroy@c-s.fr>,
        Peter Zijlstra <peterz@infradead.org>,
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Subject: [PATCH 03/28] staging: media: ipu3: use vmap insted of reimplementing it
Date:   Wed,  8 Apr 2020 13:59:01 +0200
Message-Id: <20200408115926.1467567-4-hch@lst.de>
In-Reply-To: <20200408115926.1467567-1-hch@lst.de>
References: <20200408115926.1467567-1-hch@lst.de>
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Just use vmap instead of messing with vmalloc internals.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/staging/media/ipu3/ipu3-css-pool.h |  4 +--
 drivers/staging/media/ipu3/ipu3-dmamap.c   | 30 ++++++----------------
 2 files changed, 9 insertions(+), 25 deletions(-)

diff --git a/drivers/staging/media/ipu3/ipu3-css-pool.h b/drivers/staging/media/ipu3/ipu3-css-pool.h
index f4a60b41401b..a8ccd4f70320 100644
--- a/drivers/staging/media/ipu3/ipu3-css-pool.h
+++ b/drivers/staging/media/ipu3/ipu3-css-pool.h
@@ -15,14 +15,12 @@ struct imgu_device;
  * @size:		size of the buffer in bytes.
  * @vaddr:		kernel virtual address.
  * @daddr:		iova dma address to access IPU3.
- * @vma:		private, a pointer to &struct vm_struct,
- *			used for imgu_dmamap_free.
  */
 struct imgu_css_map {
 	size_t size;
 	void *vaddr;
 	dma_addr_t daddr;
-	struct vm_struct *vma;
+	struct page **pages;
 };
 
 /**
diff --git a/drivers/staging/media/ipu3/ipu3-dmamap.c b/drivers/staging/media/ipu3/ipu3-dmamap.c
index 7431322379f6..8a19b0024152 100644
--- a/drivers/staging/media/ipu3/ipu3-dmamap.c
+++ b/drivers/staging/media/ipu3/ipu3-dmamap.c
@@ -96,6 +96,7 @@ void *imgu_dmamap_alloc(struct imgu_device *imgu, struct imgu_css_map *map,
 	unsigned long shift = iova_shift(&imgu->iova_domain);
 	struct device *dev = &imgu->pci_dev->dev;
 	size_t size = PAGE_ALIGN(len);
+	int count = size >> PAGE_SHIFT;
 	struct page **pages;
 	dma_addr_t iovaddr;
 	struct iova *iova;
@@ -114,7 +115,7 @@ void *imgu_dmamap_alloc(struct imgu_device *imgu, struct imgu_css_map *map,
 
 	/* Call IOMMU driver to setup pgt */
 	iovaddr = iova_dma_addr(&imgu->iova_domain, iova);
-	for (i = 0; i < size / PAGE_SIZE; ++i) {
+	for (i = 0; i < count; ++i) {
 		rval = imgu_mmu_map(imgu->mmu, iovaddr,
 				    page_to_phys(pages[i]), PAGE_SIZE);
 		if (rval)
@@ -123,33 +124,23 @@ void *imgu_dmamap_alloc(struct imgu_device *imgu, struct imgu_css_map *map,
 		iovaddr += PAGE_SIZE;
 	}
 
-	/* Now grab a virtual region */
-	map->vma = __get_vm_area(size, VM_USERMAP, VMALLOC_START, VMALLOC_END);
-	if (!map->vma)
+	map->vaddr = vmap(pages, count, VM_USERMAP, PAGE_KERNEL);
+	if (!map->vaddr)
 		goto out_unmap;
 
-	map->vma->pages = pages;
-	/* And map it in KVA */
-	if (map_vm_area(map->vma, PAGE_KERNEL, pages))
-		goto out_vunmap;
-
+	map->pages = pages;
 	map->size = size;
 	map->daddr = iova_dma_addr(&imgu->iova_domain, iova);
-	map->vaddr = map->vma->addr;
 
 	dev_dbg(dev, "%s: allocated %zu @ IOVA %pad @ VA %p\n", __func__,
-		size, &map->daddr, map->vma->addr);
-
-	return map->vma->addr;
+		size, &map->daddr, map->vaddr);
 
-out_vunmap:
-	vunmap(map->vma->addr);
+	return map->vaddr;
 
 out_unmap:
 	imgu_dmamap_free_buffer(pages, size);
 	imgu_mmu_unmap(imgu->mmu, iova_dma_addr(&imgu->iova_domain, iova),
 		       i * PAGE_SIZE);
-	map->vma = NULL;
 
 out_free_iova:
 	__free_iova(&imgu->iova_domain, iova);
@@ -177,8 +168,6 @@ void imgu_dmamap_unmap(struct imgu_device *imgu, struct imgu_css_map *map)
  */
 void imgu_dmamap_free(struct imgu_device *imgu, struct imgu_css_map *map)
 {
-	struct vm_struct *area = map->vma;
-
 	dev_dbg(&imgu->pci_dev->dev, "%s: freeing %zu @ IOVA %pad @ VA %p\n",
 		__func__, map->size, &map->daddr, map->vaddr);
 
@@ -187,11 +176,8 @@ void imgu_dmamap_free(struct imgu_device *imgu, struct imgu_css_map *map)
 
 	imgu_dmamap_unmap(imgu, map);
 
-	if (WARN_ON(!area) || WARN_ON(!area->pages))
-		return;
-
-	imgu_dmamap_free_buffer(area->pages, map->size);
 	vunmap(map->vaddr);
+	imgu_dmamap_free_buffer(map->pages, map->size);
 	map->vaddr = NULL;
 }
 
-- 
2.25.1