[PATCH 5/6] drm/mediatek: Convert to use CMA helpers

[Rob Herring <robh@kernel.org>]

The only reason the Mediatek driver doesn't use the CMA helpers is it
sets DMA_ATTR_NO_KERNEL_MAPPING and does a vmap() on demand. Using
vmap() is not even guaranteed to work as DMA buffers may not have a
struct page. Now that the CMA helpers support setting
DMA_ATTR_NO_KERNEL_MAPPING as needed or not, convert Mediatek driver to
use CMA helpers.

Cc: CK Hu <ck.hu@mediatek.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mediatek@lists.infradead.org
Signed-off-by: Rob Herring <robh@kernel.org>
---
 drivers/gpu/drm/mediatek/Makefile        |   1 -
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c  |   2 +-
 drivers/gpu/drm/mediatek/mtk_drm_drv.c   |  28 +--
 drivers/gpu/drm/mediatek/mtk_drm_fb.c    |   1 -
 drivers/gpu/drm/mediatek/mtk_drm_gem.c   | 289 -----------------------
 drivers/gpu/drm/mediatek/mtk_drm_gem.h   |  51 ----
 drivers/gpu/drm/mediatek/mtk_drm_plane.c |   7 +-
 7 files changed, 15 insertions(+), 364 deletions(-)
 delete mode 100644 drivers/gpu/drm/mediatek/mtk_drm_gem.c
 delete mode 100644 drivers/gpu/drm/mediatek/mtk_drm_gem.h

diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
index 82ae49c64221..50a50e86738f 100644
--- a/drivers/gpu/drm/mediatek/Makefile
+++ b/drivers/gpu/drm/mediatek/Makefile
@@ -8,7 +8,6 @@ mediatek-drm-y := mtk_disp_color.o \
 		  mtk_drm_ddp_comp.o \
 		  mtk_drm_drv.o \
 		  mtk_drm_fb.o \
-		  mtk_drm_gem.o \
 		  mtk_drm_plane.o \
 		  mtk_dsi.o \
 		  mtk_mipi_tx.o \
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 34a731755791..638d57e8ac12 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -11,6 +11,7 @@
 
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_plane_helper.h>
+#include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_vblank.h>
 
@@ -18,7 +19,6 @@
 #include "mtk_drm_crtc.h"
 #include "mtk_drm_ddp.h"
 #include "mtk_drm_ddp_comp.h"
-#include "mtk_drm_gem.h"
 #include "mtk_drm_plane.h"
 
 /**
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index 352b81a7a670..36f32507e5fb 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -28,7 +28,6 @@
 #include "mtk_drm_ddp_comp.h"
 #include "mtk_drm_drv.h"
 #include "mtk_drm_fb.h"
-#include "mtk_drm_gem.h"
 
 #define DRIVER_NAME "mediatek"
 #define DRIVER_DESC "Mediatek SoC DRM"
@@ -335,16 +334,14 @@ static void mtk_drm_kms_deinit(struct drm_device *drm)
 	drm_mode_config_cleanup(drm);
 }
 
-static const struct file_operations mtk_drm_fops = {
-	.owner = THIS_MODULE,
-	.open = drm_open,
-	.release = drm_release,
-	.unlocked_ioctl = drm_ioctl,
-	.mmap = mtk_drm_gem_mmap,
-	.poll = drm_poll,
-	.read = drm_read,
-	.compat_ioctl = drm_compat_ioctl,
-};
+DEFINE_DRM_GEM_CMA_FOPS(mtk_drm_fops);
+
+static int mtk_drm_gem_dumb_create(struct drm_file *file_priv,
+				   struct drm_device *dev,
+				   struct drm_mode_create_dumb *args)
+{
+	return drm_gem_cma_dumb_create_internal(file_priv, dev, args);
+}
 
 /*
  * We need to override this because the device used to import the memory is
@@ -361,18 +358,15 @@ struct drm_gem_object *mtk_drm_gem_prime_import(struct drm_device *dev,
 static struct drm_driver mtk_drm_driver = {
 	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 
-	.gem_free_object_unlocked = mtk_drm_gem_free_object,
 	.gem_vm_ops = &drm_gem_cma_vm_ops,
+	.gem_create_object = drm_cma_gem_create_object_default_funcs,
 	.dumb_create = mtk_drm_gem_dumb_create,
 
 	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 	.gem_prime_import = mtk_drm_gem_prime_import,
-	.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,
+	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table_vmap,
+	.gem_prime_mmap = drm_gem_prime_mmap,
 	.fops = &mtk_drm_fops,
 
 	.name = DRIVER_NAME,
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_fb.c b/drivers/gpu/drm/mediatek/mtk_drm_fb.c
index 3f230a28a2dc..596b4d5ed002 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_fb.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_fb.c
@@ -14,7 +14,6 @@
 
 #include "mtk_drm_drv.h"
 #include "mtk_drm_fb.h"
-#include "mtk_drm_gem.h"
 
 static const struct drm_framebuffer_funcs mtk_drm_fb_funcs = {
 	.create_handle = drm_gem_fb_create_handle,
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
deleted file mode 100644
index ca672f1d140d..000000000000
--- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
+++ /dev/null
@@ -1,289 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (c) 2015 MediaTek Inc.
- */
-
-#include <linux/dma-buf.h>
-
-#include <drm/drm.h>
-#include <drm/drm_device.h>
-#include <drm/drm_gem.h>
-#include <drm/drm_prime.h>
-
-#include "mtk_drm_drv.h"
-#include "mtk_drm_gem.h"
-
-static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev,
-						unsigned long size)
-{
-	struct mtk_drm_gem_obj *mtk_gem_obj;
-	int ret;
-
-	size = round_up(size, PAGE_SIZE);
-
-	mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
-	if (!mtk_gem_obj)
-		return ERR_PTR(-ENOMEM);
-
-	ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
-	if (ret < 0) {
-		DRM_ERROR("failed to initialize gem object\n");
-		kfree(mtk_gem_obj);
-		return ERR_PTR(ret);
-	}
-
-	return mtk_gem_obj;
-}
-
-struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
-					   size_t size, bool alloc_kmap)
-{
-	struct mtk_drm_private *priv = dev->dev_private;
-	struct mtk_drm_gem_obj *mtk_gem;
-	struct drm_gem_object *obj;
-	int ret;
-
-	mtk_gem = mtk_drm_gem_init(dev, size);
-	if (IS_ERR(mtk_gem))
-		return ERR_CAST(mtk_gem);
-
-	obj = &mtk_gem->base;
-
-	mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE;
-
-	if (!alloc_kmap)
-		mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
-
-	mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
-					  &mtk_gem->dma_addr, GFP_KERNEL,
-					  mtk_gem->dma_attrs);
-	if (!mtk_gem->cookie) {
-		DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
-		ret = -ENOMEM;
-		goto err_gem_free;
-	}
-
-	if (alloc_kmap)
-		mtk_gem->kvaddr = mtk_gem->cookie;
-
-	DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
-			 mtk_gem->cookie, &mtk_gem->dma_addr,
-			 size);
-
-	return mtk_gem;
-
-err_gem_free:
-	drm_gem_object_release(obj);
-	kfree(mtk_gem);
-	return ERR_PTR(ret);
-}
-
-void mtk_drm_gem_free_object(struct drm_gem_object *obj)
-{
-	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
-	struct mtk_drm_private *priv = obj->dev->dev_private;
-
-	if (mtk_gem->sg)
-		drm_prime_gem_destroy(obj, mtk_gem->sg);
-	else
-		dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
-			       mtk_gem->dma_addr, mtk_gem->dma_attrs);
-
-	/* release file pointer to gem object. */
-	drm_gem_object_release(obj);
-
-	kfree(mtk_gem);
-}
-
-int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
-			    struct drm_mode_create_dumb *args)
-{
-	struct mtk_drm_gem_obj *mtk_gem;
-	int ret;
-
-	args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
-	args->size = args->pitch * args->height;
-
-	mtk_gem = mtk_drm_gem_create(dev, args->size, false);
-	if (IS_ERR(mtk_gem))
-		return PTR_ERR(mtk_gem);
-
-	/*
-	 * allocate a id of idr table where the obj is registered
-	 * and handle has the id what user can see.
-	 */
-	ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
-	if (ret)
-		goto err_handle_create;
-
-	/* drop reference from allocate - handle holds it now. */
-	drm_gem_object_put_unlocked(&mtk_gem->base);
-
-	return 0;
-
-err_handle_create:
-	mtk_drm_gem_free_object(&mtk_gem->base);
-	return ret;
-}
-
-static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
-				   struct vm_area_struct *vma)
-
-{
-	int ret;
-	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
-	struct mtk_drm_private *priv = obj->dev->dev_private;
-
-	/*
-	 * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
-	 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
-	 */
-	vma->vm_flags &= ~VM_PFNMAP;
-
-	ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
-			     mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
-	if (ret)
-		drm_gem_vm_close(vma);
-
-	return ret;
-}
-
-int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj, struct vm_area_struct *vma)
-{
-	int ret;
-
-	ret = drm_gem_mmap_obj(obj, obj->size, vma);
-	if (ret)
-		return ret;
-
-	return mtk_drm_gem_object_mmap(obj, vma);
-}
-
-int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
-{
-	struct drm_gem_object *obj;
-	int ret;
-
-	ret = drm_gem_mmap(filp, vma);
-	if (ret)
-		return ret;
-
-	obj = vma->vm_private_data;
-
-	/*
-	 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
-	 * whole buffer from the start.
-	 */
-	vma->vm_pgoff = 0;
-
-	return mtk_drm_gem_object_mmap(obj, vma);
-}
-
-/*
- * Allocate a sg_table for this GEM object.
- * Note: Both the table's contents, and the sg_table itself must be freed by
- *       the caller.
- * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
- */
-struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
-{
-	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
-	struct mtk_drm_private *priv = obj->dev->dev_private;
-	struct sg_table *sgt;
-	int ret;
-
-	sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
-	if (!sgt)
-		return ERR_PTR(-ENOMEM);
-
-	ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
-				    mtk_gem->dma_addr, obj->size,
-				    mtk_gem->dma_attrs);
-	if (ret) {
-		DRM_ERROR("failed to allocate sgt, %d\n", ret);
-		kfree(sgt);
-		return ERR_PTR(ret);
-	}
-
-	return sgt;
-}
-
-struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
-			struct dma_buf_attachment *attach, struct sg_table *sg)
-{
-	struct mtk_drm_gem_obj *mtk_gem;
-	int ret;
-	struct scatterlist *s;
-	unsigned int i;
-	dma_addr_t expected;
-
-	mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
-
-	if (IS_ERR(mtk_gem))
-		return ERR_CAST(mtk_gem);
-
-	expected = sg_dma_address(sg->sgl);
-	for_each_sg(sg->sgl, s, sg->nents, i) {
-		if (sg_dma_address(s) != expected) {
-			DRM_ERROR("sg_table is not contiguous");
-			ret = -EINVAL;
-			goto err_gem_free;
-		}
-		expected = sg_dma_address(s) + sg_dma_len(s);
-	}
-
-	mtk_gem->dma_addr = sg_dma_address(sg->sgl);
-	mtk_gem->sg = sg;
-
-	return &mtk_gem->base;
-
-err_gem_free:
-	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
deleted file mode 100644
index ff9f976d9807..000000000000
--- a/drivers/gpu/drm/mediatek/mtk_drm_gem.h
+++ /dev/null
@@ -1,51 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (c) 2015 MediaTek Inc.
- */
-
-#ifndef _MTK_DRM_GEM_H_
-#define _MTK_DRM_GEM_H_
-
-#include <drm/drm_gem.h>
-
-/*
- * mtk drm buffer structure.
- *
- * @base: a gem object.
- *	- a new handle to this gem object would be created
- *	by drm_gem_handle_create().
- * @cookie: the return value of dma_alloc_attrs(), keep it for dma_free_attrs()
- * @kvaddr: kernel virtual address of gem buffer.
- * @dma_addr: dma address of gem buffer.
- * @dma_attrs: dma attributes of gem buffer.
- *
- * P.S. this object would be transferred to user as kms_bo.handle so
- *	user can access the buffer through kms_bo.handle.
- */
-struct mtk_drm_gem_obj {
-	struct drm_gem_object	base;
-	void			*cookie;
-	void			*kvaddr;
-	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)
-
-void mtk_drm_gem_free_object(struct drm_gem_object *gem);
-struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev, size_t size,
-					   bool alloc_kmap);
-int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
-			    struct drm_mode_create_dumb *args);
-int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
-int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj,
-			 struct vm_area_struct *vma);
-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
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
index 584a9ecadce6..8f256602f075 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
@@ -8,13 +8,14 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_fourcc.h>
 #include <drm/drm_plane_helper.h>
+#include <drm/drm_print.h>
+#include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
 
 #include "mtk_drm_crtc.h"
 #include "mtk_drm_ddp_comp.h"
 #include "mtk_drm_drv.h"
 #include "mtk_drm_fb.h"
-#include "mtk_drm_gem.h"
 #include "mtk_drm_plane.h"
 
 static const u32 formats[] = {
@@ -108,7 +109,6 @@ static void mtk_plane_atomic_update(struct drm_plane *plane,
 	struct drm_crtc *crtc = plane->state->crtc;
 	struct drm_framebuffer *fb = plane->state->fb;
 	struct drm_gem_object *gem;
-	struct mtk_drm_gem_obj *mtk_gem;
 	unsigned int pitch, format;
 	dma_addr_t addr;
 
@@ -116,8 +116,7 @@ static void mtk_plane_atomic_update(struct drm_plane *plane,
 		return;
 
 	gem = fb->obj[0];
-	mtk_gem = to_mtk_gem_obj(gem);
-	addr = mtk_gem->dma_addr;
+	addr = to_drm_gem_cma_obj(gem)->paddr;
 	pitch = fb->pitches[0];
 	format = fb->format->format;
 
-- 
2.20.1

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