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* [PATCH 1/2] drm/mediatek: Implement gem prime vmap/vunmap function
@ 2019-01-16  1:39 CK Hu
  2019-01-16  1:39 ` [PATCH 2/2] drm/mediatek: Add Mediatek framebuffer device CK Hu
  0 siblings, 1 reply; 9+ messages in thread
From: CK Hu @ 2019-01-16  1:39 UTC (permalink / raw)
  To: Philipp Zabel, David Airlie, Daniel Vetter, Matthias Brugger,
	Noralf Tr�nnes, Frank Wunderlich
  Cc: dri-devel, linux-arm-kernel, linux-mediatek, linux-kernel,
	srv_heupstream, CK Hu

For some application which need kernel virtual address, such as fbcon,
implement these function to map/unmap kernel virtual address of prime
buffer.

Signed-off-by: CK Hu <ck.hu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_drv.c |  2 ++
 drivers/gpu/drm/mediatek/mtk_drm_gem.c | 46 ++++++++++++++++++++++++++
 drivers/gpu/drm/mediatek/mtk_drm_gem.h |  3 ++
 3 files changed, 51 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index 6422e99952fe..6ec4ca070382 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -341,6 +341,8 @@ static struct drm_driver mtk_drm_driver = {
 	.gem_prime_get_sg_table = mtk_gem_prime_get_sg_table,
 	.gem_prime_import_sg_table = mtk_gem_prime_import_sg_table,
 	.gem_prime_mmap = mtk_drm_gem_mmap_buf,
+	.gem_prime_vmap = mtk_drm_gem_prime_vmap,
+	.gem_prime_vunmap = mtk_drm_gem_prime_vunmap,
 	.fops = &mtk_drm_fops,
 
 	.name = DRIVER_NAME,
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
index 259b7b0de1d2..38483e9ee071 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
@@ -241,3 +241,49 @@ struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
 	kfree(mtk_gem);
 	return ERR_PTR(ret);
 }
+
+void *mtk_drm_gem_prime_vmap(struct drm_gem_object *obj)
+{
+	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
+	struct sg_table *sgt;
+	struct sg_page_iter iter;
+	unsigned int npages;
+	unsigned int i = 0;
+
+	if (mtk_gem->kvaddr)
+		return mtk_gem->kvaddr;
+
+	sgt = mtk_gem_prime_get_sg_table(obj);
+	if (IS_ERR(sgt))
+		return NULL;
+
+	npages = obj->size >> PAGE_SHIFT;
+	mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL);
+	if (!mtk_gem->pages)
+		goto out;
+
+	for_each_sg_page(sgt->sgl, &iter, sgt->orig_nents, 0) {
+		mtk_gem->pages[i++] = sg_page_iter_page(&iter);
+		if (i > npages)
+			break;
+	}
+	mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
+			       pgprot_writecombine(PAGE_KERNEL));
+
+out:
+	kfree((void *)sgt);
+
+	return mtk_gem->kvaddr;
+}
+
+void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
+{
+	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
+
+	if (!mtk_gem->pages)
+		return;
+
+	vunmap(vaddr);
+	mtk_gem->kvaddr = 0;
+	kfree((void *)mtk_gem->pages);
+}
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.h b/drivers/gpu/drm/mediatek/mtk_drm_gem.h
index 534639b43a1c..c047a7ef294f 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_gem.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.h
@@ -37,6 +37,7 @@ struct mtk_drm_gem_obj {
 	dma_addr_t		dma_addr;
 	unsigned long		dma_attrs;
 	struct sg_table		*sg;
+	struct page		**pages;
 };
 
 #define to_mtk_gem_obj(x)	container_of(x, struct mtk_drm_gem_obj, base)
@@ -52,5 +53,7 @@ int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj,
 struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj);
 struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
 			struct dma_buf_attachment *attach, struct sg_table *sg);
+void *mtk_drm_gem_prime_vmap(struct drm_gem_object *obj);
+void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
 
 #endif
-- 
2.18.1


^ permalink raw reply related	[flat|nested] 9+ messages in thread
end of thread, other threads:[~2019-03-19 16:52 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-01-16  1:39 [PATCH 1/2] drm/mediatek: Implement gem prime vmap/vunmap function CK Hu
2019-01-16  1:39 ` [PATCH 2/2] drm/mediatek: Add Mediatek framebuffer device CK Hu
2019-01-17 14:14   ` Aw: " Frank Wunderlich
2019-01-18  1:46     ` CK Hu
2019-01-18  8:39       ` Matthias Brugger
2019-01-18 12:33         ` Aw: " Frank Wunderlich
2019-01-20 13:36         ` Frank Wunderlich
2019-03-19  3:12           ` CK Hu
2019-03-19 16:52             ` Aw: " Frank Wunderlich

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