linux-kernel - [PATCH 2/3] drm/ingenic: Update code to mmap GEM buffers cached

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Message-Id: <20200930171644.299363-2-paul@crapouillou.net>
Date:   Wed, 30 Sep 2020 19:16:43 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Christoph Hellwig <hch@....de>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Dave Airlie <airlied@...ux.ie>,
        DRI <dri-devel@...ts.freedesktop.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH 2/3] drm/ingenic: Update code to mmap GEM buffers cached

The DMA API changed at the same time commit 37054fc81443 ("gpu/drm:
ingenic: Add option to mmap GEM buffers cached") was added. Rework the
code to work with the new DMA API.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 24 +++++++----------------
 1 file changed, 7 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
index 0225dc1f5eb8..07a1da7266e4 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
@@ -526,12 +526,10 @@ void ingenic_drm_sync_data(struct device *dev,
 			   struct drm_plane_state *state)
 {
 	const struct drm_format_info *finfo = state->fb->format;
-	struct ingenic_drm *priv = dev_get_drvdata(dev);
 	struct drm_atomic_helper_damage_iter iter;
 	unsigned int offset, i;
 	struct drm_rect clip;
 	dma_addr_t paddr;
-	void *addr;
 
 	if (!ingenic_drm_cached_gem_buf)
 		return;
@@ -541,12 +539,11 @@ void ingenic_drm_sync_data(struct device *dev,
 	drm_atomic_for_each_plane_damage(&iter, &clip) {
 		for (i = 0; i < finfo->num_planes; i++) {
 			paddr = drm_fb_cma_get_gem_addr(state->fb, state, i);
-			addr = phys_to_virt(paddr);
 
 			/* Ignore x1/x2 values, invalidate complete lines */
 			offset = clip.y1 * state->fb->pitches[i];
 
-			dma_cache_sync(priv->dev, addr + offset,
+			dma_sync_single_for_device(dev, paddr + offset,
 				       (clip.y2 - clip.y1) * state->fb->pitches[i],
 				       DMA_TO_DEVICE);
 		}
@@ -766,14 +763,6 @@ static int ingenic_drm_gem_mmap(struct drm_gem_object *obj,
 				struct vm_area_struct *vma)
 {
 	struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
-	struct device *dev = cma_obj->base.dev->dev;
-	unsigned long attrs;
-	int ret;
-
-	if (ingenic_drm_cached_gem_buf)
-		attrs = DMA_ATTR_NON_CONSISTENT;
-	else
-		attrs = DMA_ATTR_WRITE_COMBINE;
 
 	/*
 	 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the
@@ -784,12 +773,13 @@ static int ingenic_drm_gem_mmap(struct drm_gem_object *obj,
 	vma->vm_pgoff = 0;
 	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 
-	ret = dma_mmap_attrs(dev, vma, cma_obj->vaddr, cma_obj->paddr,
-			     vma->vm_end - vma->vm_start, attrs);
-	if (ret)
-		drm_gem_vm_close(vma);
+	if (!ingenic_drm_cached_gem_buf)
+		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 
-	return ret;
+	return remap_pfn_range(vma, vma->vm_start,
+			       cma_obj->paddr >> PAGE_SHIFT,
+			       vma->vm_end - vma->vm_start,
+			       vma->vm_page_prot);
 }
 
 static int ingenic_drm_gem_cma_mmap(struct file *filp,
-- 
2.28.0