[PATCH AUTOSEL 4.14 10/25] drm/bridge: lvds-encoder: Fix build error while CONFIG_DRM_KMS_HELPER=m

[PATCH AUTOSEL 4.14 10/25] drm/bridge: lvds-encoder: Fix build error while CONFIG_DRM_KMS_HELPER=m

[Sasha Levin]

From: YueHaibing <yuehaibing@huawei.com>

[ Upstream commit f4cc743a98136df3c3763050a0e8223b52d9a960 ]

If DRM_LVDS_ENCODER=y but CONFIG_DRM_KMS_HELPER=m,
build fails:

drivers/gpu/drm/bridge/lvds-encoder.o: In function `lvds_encoder_probe':
lvds-encoder.c:(.text+0x155): undefined reference to `devm_drm_panel_bridge_add'

Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: dbb58bfd9ae6 ("drm/bridge: Fix lvds-encoder since the panel_bridge rework.")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190729071216.27488-1-yuehaibing@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/bridge/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index adf9ae0e0b7c9..85aa824317f01 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -35,6 +35,7 @@ config DRM_DUMB_VGA_DAC
 config DRM_LVDS_ENCODER
 	tristate "Transparent parallel to LVDS encoder support"
 	depends on OF
+	select DRM_KMS_HELPER
 	select DRM_PANEL_BRIDGE
 	help
 	  Support for transparent parallel to LVDS encoders that don't require
-- 
2.20.1

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[PATCH AUTOSEL 4.14 17/25] drm/vgem: fix cache synchronization on arm/arm64

[Sasha Levin]

From: Rob Clark <robdclark@chromium.org>

[ Upstream commit 7e9e5ead55beacc11116b3fb90b0de6e7cf55a69 ]

drm_cflush_pages() is no-op on arm/arm64.  But instead we can use
dma_sync API.

Fixes failures w/ vgem_test.

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190717211542.30482-1-robdclark@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/vgem/vgem_drv.c | 130 ++++++++++++++++++++------------
 1 file changed, 83 insertions(+), 47 deletions(-)

diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c
index aa592277d5108..b0aa362a31e41 100644
--- a/drivers/gpu/drm/vgem/vgem_drv.c
+++ b/drivers/gpu/drm/vgem/vgem_drv.c
@@ -47,10 +47,16 @@ static struct vgem_device {
 	struct platform_device *platform;
 } *vgem_device;
 
+static void sync_and_unpin(struct drm_vgem_gem_object *bo);
+static struct page **pin_and_sync(struct drm_vgem_gem_object *bo);
+
 static void vgem_gem_free_object(struct drm_gem_object *obj)
 {
 	struct drm_vgem_gem_object *vgem_obj = to_vgem_bo(obj);
 
+	if (!obj->import_attach)
+		sync_and_unpin(vgem_obj);
+
 	kvfree(vgem_obj->pages);
 	mutex_destroy(&vgem_obj->pages_lock);
 
@@ -79,40 +85,15 @@ static int vgem_gem_fault(struct vm_fault *vmf)
 
 	ret = -ENOENT;
 	mutex_lock(&obj->pages_lock);
+	if (!obj->pages)
+		pin_and_sync(obj);
 	if (obj->pages) {
 		get_page(obj->pages[page_offset]);
 		vmf->page = obj->pages[page_offset];
 		ret = 0;
 	}
 	mutex_unlock(&obj->pages_lock);
-	if (ret) {
-		struct page *page;
-
-		page = shmem_read_mapping_page(
-					file_inode(obj->base.filp)->i_mapping,
-					page_offset);
-		if (!IS_ERR(page)) {
-			vmf->page = page;
-			ret = 0;
-		} else switch (PTR_ERR(page)) {
-			case -ENOSPC:
-			case -ENOMEM:
-				ret = VM_FAULT_OOM;
-				break;
-			case -EBUSY:
-				ret = VM_FAULT_RETRY;
-				break;
-			case -EFAULT:
-			case -EINVAL:
-				ret = VM_FAULT_SIGBUS;
-				break;
-			default:
-				WARN_ON(PTR_ERR(page));
-				ret = VM_FAULT_SIGBUS;
-				break;
-		}
 
-	}
 	return ret;
 }
 
@@ -278,32 +259,93 @@ static const struct file_operations vgem_driver_fops = {
 	.release	= drm_release,
 };
 
-static struct page **vgem_pin_pages(struct drm_vgem_gem_object *bo)
+/* Called under pages_lock, except in free path (where it can't race): */
+static void sync_and_unpin(struct drm_vgem_gem_object *bo)
 {
-	mutex_lock(&bo->pages_lock);
-	if (bo->pages_pin_count++ == 0) {
-		struct page **pages;
+	struct drm_device *dev = bo->base.dev;
+
+	if (bo->table) {
+		dma_sync_sg_for_cpu(dev->dev, bo->table->sgl,
+				bo->table->nents, DMA_BIDIRECTIONAL);
+		sg_free_table(bo->table);
+		kfree(bo->table);
+		bo->table = NULL;
+	}
+
+	if (bo->pages) {
+		drm_gem_put_pages(&bo->base, bo->pages, true, true);
+		bo->pages = NULL;
+	}
+}
+
+static struct page **pin_and_sync(struct drm_vgem_gem_object *bo)
+{
+	struct drm_device *dev = bo->base.dev;
+	int npages = bo->base.size >> PAGE_SHIFT;
+	struct page **pages;
+	struct sg_table *sgt;
+
+	WARN_ON(!mutex_is_locked(&bo->pages_lock));
+
+	pages = drm_gem_get_pages(&bo->base);
+	if (IS_ERR(pages)) {
+		bo->pages_pin_count--;
+		mutex_unlock(&bo->pages_lock);
+		return pages;
+	}
 
-		pages = drm_gem_get_pages(&bo->base);
-		if (IS_ERR(pages)) {
-			bo->pages_pin_count--;
-			mutex_unlock(&bo->pages_lock);
-			return pages;
-		}
+	sgt = drm_prime_pages_to_sg(pages, npages);
+	if (IS_ERR(sgt)) {
+		dev_err(dev->dev,
+			"failed to allocate sgt: %ld\n",
+			PTR_ERR(bo->table));
+		drm_gem_put_pages(&bo->base, pages, false, false);
+		mutex_unlock(&bo->pages_lock);
+		return ERR_CAST(bo->table);
+	}
+
+	/*
+	 * Flush the object from the CPU cache so that importers
+	 * can rely on coherent indirect access via the exported
+	 * dma-address.
+	 */
+	dma_sync_sg_for_device(dev->dev, sgt->sgl,
+			sgt->nents, DMA_BIDIRECTIONAL);
+
+	bo->pages = pages;
+	bo->table = sgt;
+
+	return pages;
+}
+
+static struct page **vgem_pin_pages(struct drm_vgem_gem_object *bo)
+{
+	struct page **pages;
 
-		bo->pages = pages;
+	mutex_lock(&bo->pages_lock);
+	if (bo->pages_pin_count++ == 0 && !bo->pages) {
+		pages = pin_and_sync(bo);
+	} else {
+		WARN_ON(!bo->pages);
+		pages = bo->pages;
 	}
 	mutex_unlock(&bo->pages_lock);
 
-	return bo->pages;
+	return pages;
 }
 
 static void vgem_unpin_pages(struct drm_vgem_gem_object *bo)
 {
+	/*
+	 * We shouldn't hit this for imported bo's.. in the import
+	 * case we don't own the scatter-table
+	 */
+	WARN_ON(bo->base.import_attach);
+
 	mutex_lock(&bo->pages_lock);
 	if (--bo->pages_pin_count == 0) {
-		drm_gem_put_pages(&bo->base, bo->pages, true, true);
-		bo->pages = NULL;
+		WARN_ON(!bo->table);
+		sync_and_unpin(bo);
 	}
 	mutex_unlock(&bo->pages_lock);
 }
@@ -311,18 +353,12 @@ static void vgem_unpin_pages(struct drm_vgem_gem_object *bo)
 static int vgem_prime_pin(struct drm_gem_object *obj)
 {
 	struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
-	long n_pages = obj->size >> PAGE_SHIFT;
 	struct page **pages;
 
 	pages = vgem_pin_pages(bo);
 	if (IS_ERR(pages))
 		return PTR_ERR(pages);
 
-	/* Flush the object from the CPU cache so that importers can rely
-	 * on coherent indirect access via the exported dma-address.
-	 */
-	drm_clflush_pages(pages, n_pages);
-
 	return 0;
 }
 
-- 
2.20.1

[PATCH AUTOSEL 4.14 22/25] drm: msm: Fix add_gpu_components

[Sasha Levin]

From: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>

[ Upstream commit 9ca7ad6c7706edeae331c1632d0c63897418ebad ]

add_gpu_components() adds found GPU nodes from the DT to the match list,
regardless of the status of the nodes.  This is a problem, because if the
nodes are disabled, they should not be on the match list because they will
not be matched.  This prevents display from initing if a GPU node is
defined, but it's status is disabled.

Fix this by checking the node's status before adding it to the match list.

Fixes: dc3ea265b856 (drm/msm: Drop the gpu binding)
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190626180015.45242-1-jeffrey.l.hugo@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/msm/msm_drv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index b970427e53a7a..77c45a2ebd833 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -1060,7 +1060,8 @@ static int add_gpu_components(struct device *dev,
 	if (!np)
 		return 0;
 
-	drm_of_component_match_add(dev, matchptr, compare_of, np);
+	if (of_device_is_available(np))
+		drm_of_component_match_add(dev, matchptr, compare_of, np);
 
 	of_node_put(np);
 
-- 
2.20.1

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