fbdev: don't pass a NULL struct device to DMA API functions v2

fbdev: don't pass a NULL struct device to DMA API functions v2

[Christoph Hellwig]

We still have a few drivers which pass a NULL struct device pointer
to DMA API functions, which generally is a bad idea as the API
implementations rely on the device not only for ops selection, but
also the dma mask and various other attributes.

This series contains all easy conversions to pass a struct device,
besides that there also is some arch code that needs separate handling,
a driver that should not use the DMA API at all, and one that is
a complete basket case to be deal with separately.

Changes since v1:
 - split the series, this only contains the fbdev patches

[PATCH 1/3] da8xx-fb: pass struct device to DMA API functions

[Christoph Hellwig]

The DMA API generally relies on a struct device to work properly, and
only barely works without one for legacy reasons.  Pass the easily
available struct device from the platform_device to remedy this.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/video/fbdev/da8xx-fb.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/video/fbdev/da8xx-fb.c b/drivers/video/fbdev/da8xx-fb.c
index 43f2a4816860..ec62274b914b 100644
--- a/drivers/video/fbdev/da8xx-fb.c
+++ b/drivers/video/fbdev/da8xx-fb.c
@@ -1097,9 +1097,9 @@ static int fb_remove(struct platform_device *dev)
 
 		unregister_framebuffer(info);
 		fb_dealloc_cmap(&info->cmap);
-		dma_free_coherent(NULL, PALETTE_SIZE, par->v_palette_base,
+		dma_free_coherent(par->dev, PALETTE_SIZE, par->v_palette_base,
 				  par->p_palette_base);
-		dma_free_coherent(NULL, par->vram_size, par->vram_virt,
+		dma_free_coherent(par->dev, par->vram_size, par->vram_virt,
 				  par->vram_phys);
 		pm_runtime_put_sync(&dev->dev);
 		pm_runtime_disable(&dev->dev);
@@ -1425,7 +1425,7 @@ static int fb_probe(struct platform_device *device)
 	par->vram_size = roundup(par->vram_size/8, ulcm);
 	par->vram_size = par->vram_size * LCD_NUM_BUFFERS;
 
-	par->vram_virt = dma_alloc_coherent(NULL,
+	par->vram_virt = dma_alloc_coherent(par->dev,
 					    par->vram_size,
 					    &par->vram_phys,
 					    GFP_KERNEL | GFP_DMA);
@@ -1446,7 +1446,7 @@ static int fb_probe(struct platform_device *device)
 		da8xx_fb_fix.line_length - 1;
 
 	/* allocate palette buffer */
-	par->v_palette_base = dma_alloc_coherent(NULL, PALETTE_SIZE,
+	par->v_palette_base = dma_alloc_coherent(par->dev, PALETTE_SIZE,
 						 &par->p_palette_base,
 						 GFP_KERNEL | GFP_DMA);
 	if (!par->v_palette_base) {
@@ -1532,11 +1532,12 @@ static int fb_probe(struct platform_device *device)
 	fb_dealloc_cmap(&da8xx_fb_info->cmap);
 
 err_release_pl_mem:
-	dma_free_coherent(NULL, PALETTE_SIZE, par->v_palette_base,
+	dma_free_coherent(par->dev, PALETTE_SIZE, par->v_palette_base,
 			  par->p_palette_base);
 
 err_release_fb_mem:
-	dma_free_coherent(NULL, par->vram_size, par->vram_virt, par->vram_phys);
+	dma_free_coherent(par->dev, par->vram_size, par->vram_virt,
+		          par->vram_phys);
 
 err_release_fb:
 	framebuffer_release(da8xx_fb_info);
-- 
2.20.1

[PATCH 2/3] gbefb: switch to managed version of the DMA allocator

[Christoph Hellwig]

gbefb uses managed resources, so it should do the same for DMA
allocations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/video/fbdev/gbefb.c | 24 ++++++++----------------
 1 file changed, 8 insertions(+), 16 deletions(-)

diff --git a/drivers/video/fbdev/gbefb.c b/drivers/video/fbdev/gbefb.c
index 1a242b1338e9..3fcb33232ba3 100644
--- a/drivers/video/fbdev/gbefb.c
+++ b/drivers/video/fbdev/gbefb.c
@@ -1162,9 +1162,9 @@ static int gbefb_probe(struct platform_device *p_dev)
 	}
 	gbe_revision = gbe->ctrlstat & 15;
 
-	gbe_tiles.cpu =
-		dma_alloc_coherent(NULL, GBE_TLB_SIZE * sizeof(uint16_t),
-				   &gbe_tiles.dma, GFP_KERNEL);
+	gbe_tiles.cpu = dmam_alloc_coherent(&p_dev->dev,
+				GBE_TLB_SIZE * sizeof(uint16_t),
+				&gbe_tiles.dma, GFP_KERNEL);
 	if (!gbe_tiles.cpu) {
 		printk(KERN_ERR "gbefb: couldn't allocate tiles table\n");
 		ret = -ENOMEM;
@@ -1178,19 +1178,20 @@ static int gbefb_probe(struct platform_device *p_dev)
 		if (!gbe_mem) {
 			printk(KERN_ERR "gbefb: couldn't map framebuffer\n");
 			ret = -ENOMEM;
-			goto out_tiles_free;
+			goto out_release_mem_region;
 		}
 
 		gbe_dma_addr = 0;
 	} else {
 		/* try to allocate memory with the classical allocator
 		 * this has high chance to fail on low memory machines */
-		gbe_mem = dma_alloc_wc(NULL, gbe_mem_size, &gbe_dma_addr,
-				       GFP_KERNEL);
+		gbe_mem = dmam_alloc_attrs(&p_dev->dev, gbe_mem_size,
+				&gbe_dma_addr, GFP_KERNEL,
+				DMA_ATTR_WRITE_COMBINE);
 		if (!gbe_mem) {
 			printk(KERN_ERR "gbefb: couldn't allocate framebuffer memory\n");
 			ret = -ENOMEM;
-			goto out_tiles_free;
+			goto out_release_mem_region;
 		}
 
 		gbe_mem_phys = (unsigned long) gbe_dma_addr;
@@ -1237,11 +1238,6 @@ static int gbefb_probe(struct platform_device *p_dev)
 
 out_gbe_unmap:
 	arch_phys_wc_del(par->wc_cookie);
-	if (gbe_dma_addr)
-		dma_free_wc(NULL, gbe_mem_size, gbe_mem, gbe_mem_phys);
-out_tiles_free:
-	dma_free_coherent(NULL, GBE_TLB_SIZE * sizeof(uint16_t),
-			  (void *)gbe_tiles.cpu, gbe_tiles.dma);
 out_release_mem_region:
 	release_mem_region(GBE_BASE, sizeof(struct sgi_gbe));
 out_release_framebuffer:
@@ -1258,10 +1254,6 @@ static int gbefb_remove(struct platform_device* p_dev)
 	unregister_framebuffer(info);
 	gbe_turn_off();
 	arch_phys_wc_del(par->wc_cookie);
-	if (gbe_dma_addr)
-		dma_free_wc(NULL, gbe_mem_size, gbe_mem, gbe_mem_phys);
-	dma_free_coherent(NULL, GBE_TLB_SIZE * sizeof(uint16_t),
-			  (void *)gbe_tiles.cpu, gbe_tiles.dma);
 	release_mem_region(GBE_BASE, sizeof(struct sgi_gbe));
 	gbefb_remove_sysfs(&p_dev->dev);
 	framebuffer_release(info);
-- 
2.20.1

[PATCH 3/3] pxa3xx-gcu: pass struct device to dma_mmap_coherent

[Christoph Hellwig]

Just like we do for all other DMA operations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/video/fbdev/pxa3xx-gcu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/pxa3xx-gcu.c b/drivers/video/fbdev/pxa3xx-gcu.c
index 69cfb337c857..047a2fa4b87e 100644
--- a/drivers/video/fbdev/pxa3xx-gcu.c
+++ b/drivers/video/fbdev/pxa3xx-gcu.c
@@ -96,6 +96,7 @@ struct pxa3xx_gcu_batch {
 };
 
 struct pxa3xx_gcu_priv {
+	struct device		 *dev;
 	void __iomem		 *mmio_base;
 	struct clk		 *clk;
 	struct pxa3xx_gcu_shared *shared;
@@ -493,7 +494,7 @@ pxa3xx_gcu_mmap(struct file *file, struct vm_area_struct *vma)
 		if (size != SHARED_SIZE)
 			return -EINVAL;
 
-		return dma_mmap_coherent(NULL, vma,
+		return dma_mmap_coherent(priv->dev, vma,
 			priv->shared, priv->shared_phys, size);
 
 	case SHARED_SIZE >> PAGE_SHIFT:
@@ -670,6 +671,7 @@ static int pxa3xx_gcu_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, priv);
 	priv->resource_mem = r;
+	priv->dev = dev;
 	pxa3xx_gcu_reset(priv);
 	pxa3xx_gcu_init_debug_timer(priv);
 
-- 
2.20.1