From: Thomas Hellstrom <thellstrom@vmware.com>
Date: Thu, 22 Mar 2018 10:19:01 +0100
Subject: drm/vmwgfx: Avoid pinning fbdev framebuffers
Git-commit: bf833fd36f9bdc2c86e1fdc90318e4c99b452472
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

fbdev framebuffers were previously pinned to be able to keep them mapped
across updates.

This commit introduces a mechanism that instead revalidates the map on
each update, keeping the map cached across updates. The cached map is torn
down if the underlying pages change. Typically on buffer object moves and
swapouts.

This should be nicer to the system when we have resource contention.

Testing done: Basic fbdev functionality under Fedora 27.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Sinclair Yeh <syeh@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Deepak Rawat <drawat@vmware.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c   |    1 
 drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c   |   51 +++++++++++++++++++++++
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.h      |    5 ++
 drivers/gpu/drm/vmwgfx/vmwgfx_fb.c       |   67 ++++++++-----------------------
 drivers/gpu/drm/vmwgfx/vmwgfx_resource.c |   23 ++++++++++
 5 files changed, 98 insertions(+), 49 deletions(-)

--- a/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
@@ -864,6 +864,7 @@ static void vmw_move_notify(struct ttm_b
  */
 static void vmw_swap_notify(struct ttm_buffer_object *bo)
 {
+	vmw_resource_swap_notify(bo);
 	(void) ttm_bo_wait(bo, false, false);
 }
 
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c
@@ -323,3 +323,54 @@ void vmw_bo_pin_reserved(struct vmw_dma_
 
 	BUG_ON(ret != 0 || bo->mem.mem_type != old_mem_type);
 }
+
+
+/*
+ * vmw_dma_buffer_unmap - Tear down a cached buffer object map.
+ *
+ * @vbo: The buffer object whose map we are tearing down.
+ *
+ * This function tears down a cached map set up using
+ * vmw_dma_buffer_map_and_cache().
+ */
+void vmw_dma_buffer_unmap(struct vmw_dma_buffer *vbo)
+{
+	if (vbo->map.bo == NULL)
+		return;
+
+	ttm_bo_kunmap(&vbo->map);
+}
+
+
+/*
+ * vmw_dma_buffer_map_and_cache - Map a buffer object and cache the map
+ *
+ * @vbo: The buffer object to map
+ * Return: A kernel virtual address or NULL if mapping failed.
+ *
+ * This function maps a buffer object into the kernel address space, or
+ * returns the virtual kernel address of an already existing map. The virtual
+ * address remains valid as long as the buffer object is pinned or reserved.
+ * The cached map is torn down on either
+ * 1) Buffer object move
+ * 2) Buffer object swapout
+ * 3) Buffer object destruction
+ *
+ */
+void *vmw_dma_buffer_map_and_cache(struct vmw_dma_buffer *vbo)
+{
+	struct ttm_buffer_object *bo = &vbo->base;
+	bool not_used;
+	void *virtual;
+	int ret;
+
+	virtual = ttm_kmap_obj_virtual(&vbo->map, &not_used);
+	if (virtual)
+		return virtual;
+
+	ret = ttm_bo_kmap(bo, 0, bo->num_pages, &vbo->map);
+	if (ret)
+		DRM_ERROR("Buffer object map failed: %d.\n", ret);
+
+	return ttm_kmap_obj_virtual(&vbo->map, &not_used);
+}
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -92,6 +92,8 @@ struct vmw_dma_buffer {
 	s32 pin_count;
 	/* Not ref-counted.  Protected by binding_mutex */
 	struct vmw_resource *dx_query_ctx;
+	/* Protected by reservation */
+	struct ttm_bo_kmap_obj map;
 };
 
 /**
@@ -673,6 +675,7 @@ extern void vmw_resource_move_notify(str
 				     struct ttm_mem_reg *mem);
 extern void vmw_query_move_notify(struct ttm_buffer_object *bo,
 				  struct ttm_mem_reg *mem);
+extern void vmw_resource_swap_notify(struct ttm_buffer_object *bo);
 extern int vmw_query_readback_all(struct vmw_dma_buffer *dx_query_mob);
 extern void vmw_fence_single_bo(struct ttm_buffer_object *bo,
 				struct vmw_fence_obj *fence);
@@ -701,6 +704,8 @@ extern int vmw_dmabuf_unpin(struct vmw_p
 extern void vmw_bo_get_guest_ptr(const struct ttm_buffer_object *buf,
 				 SVGAGuestPtr *ptr);
 extern void vmw_bo_pin_reserved(struct vmw_dma_buffer *bo, bool pin);
+extern void *vmw_dma_buffer_map_and_cache(struct vmw_dma_buffer *vbo);
+extern void vmw_dma_buffer_unmap(struct vmw_dma_buffer *vbo);
 
 /**
  * Misc Ioctl functionality - vmwgfx_ioctl.c
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
@@ -43,8 +43,6 @@ struct vmw_fb_par {
 
 	struct mutex bo_mutex;
 	struct vmw_dma_buffer *vmw_bo;
-	struct ttm_bo_kmap_obj map;
-	void *bo_ptr;
 	unsigned bo_size;
 	struct drm_framebuffer *set_fb;
 	struct drm_display_mode *set_mode;
@@ -174,11 +172,13 @@ static void vmw_fb_dirty_flush(struct wo
 	struct vmw_private *vmw_priv = par->vmw_priv;
 	struct fb_info *info = vmw_priv->fb_info;
 	unsigned long irq_flags;
-	s32 dst_x1, dst_x2, dst_y1, dst_y2, w, h;
+	s32 dst_x1, dst_x2, dst_y1, dst_y2, w = 0, h = 0;
 	u32 cpp, max_x, max_y;
 	struct drm_clip_rect clip;
 	struct drm_framebuffer *cur_fb;
 	u8 *src_ptr, *dst_ptr;
+	struct vmw_dma_buffer *vbo = par->vmw_bo;
+	void *virtual;
 
 	if (vmw_priv->suspended)
 		return;
@@ -188,10 +188,16 @@ static void vmw_fb_dirty_flush(struct wo
 	if (!cur_fb)
 		goto out_unlock;
 
+	(void) ttm_read_lock(&vmw_priv->reservation_sem, false);
+	(void) ttm_bo_reserve(&vbo->base, false, false, NULL);
+	virtual = vmw_dma_buffer_map_and_cache(vbo);
+	if (!virtual)
+		goto out_unreserve;
+
 	spin_lock_irqsave(&par->dirty.lock, irq_flags);
 	if (!par->dirty.active) {
 		spin_unlock_irqrestore(&par->dirty.lock, irq_flags);
-		goto out_unlock;
+		goto out_unreserve;
 	}
 
 	/*
@@ -221,7 +227,7 @@ static void vmw_fb_dirty_flush(struct wo
 	spin_unlock_irqrestore(&par->dirty.lock, irq_flags);
 
 	if (w && h) {
-		dst_ptr = (u8 *)par->bo_ptr  +
+		dst_ptr = (u8 *)virtual  +
 			(dst_y1 * par->set_fb->pitches[0] + dst_x1 * cpp);
 		src_ptr = (u8 *)par->vmalloc +
 			((dst_y1 + par->fb_y) * info->fix.line_length +
@@ -237,7 +243,12 @@ static void vmw_fb_dirty_flush(struct wo
 		clip.x2 = dst_x2;
 		clip.y1 = dst_y1;
 		clip.y2 = dst_y2;
+	}
 
+out_unreserve:
+	ttm_bo_unreserve(&vbo->base);
+	ttm_read_unlock(&vmw_priv->reservation_sem);
+	if (w && h) {
 		WARN_ON_ONCE(par->set_fb->funcs->dirty(cur_fb, NULL, 0, 0,
 						       &clip, 1));
 		vmw_fifo_flush(vmw_priv, false);
@@ -504,18 +515,8 @@ static int vmw_fb_kms_detach(struct vmw_
 		par->set_fb = NULL;
 	}
 
-	if (par->vmw_bo && detach_bo) {
-		struct vmw_private *vmw_priv = par->vmw_priv;
-
-		if (par->bo_ptr) {
-			ttm_bo_kunmap(&par->map);
-			par->bo_ptr = NULL;
-		}
-		if (unref_bo)
-			vmw_dmabuf_unreference(&par->vmw_bo);
-		else if (vmw_priv->active_display_unit != vmw_du_legacy)
-			vmw_dmabuf_unpin(par->vmw_priv, par->vmw_bo, false);
-	}
+	if (par->vmw_bo && detach_bo && unref_bo)
+		vmw_dmabuf_unreference(&par->vmw_bo);
 
 	return 0;
 }
@@ -636,38 +637,6 @@ static int vmw_fb_set_par(struct fb_info
 	if (ret)
 		goto out_unlock;
 
-	if (!par->bo_ptr) {
-		struct vmw_framebuffer *vfb = vmw_framebuffer_to_vfb(set.fb);
-
-		/*
-		 * Pin before mapping. Since we don't know in what placement
-		 * to pin, call into KMS to do it for us.  LDU doesn't require
-		 * additional pinning because set_config() would've pinned
-		 * it already
-		 */
-		if (vmw_priv->active_display_unit != vmw_du_legacy) {
-			ret = vfb->pin(vfb);
-			if (ret) {
-				DRM_ERROR("Could not pin the fbdev "
-					  "framebuffer.\n");
-				goto out_unlock;
-			}
-		}
-
-		ret = ttm_bo_kmap(&par->vmw_bo->base, 0,
-				  par->vmw_bo->base.num_pages, &par->map);
-		if (ret) {
-			if (vmw_priv->active_display_unit != vmw_du_legacy)
-				vfb->unpin(vfb);
-
-			DRM_ERROR("Could not map the fbdev framebuffer.\n");
-			goto out_unlock;
-		}
-
-		par->bo_ptr = ttm_kmap_obj_virtual(&par->map, &par->bo_iowrite);
-	}
-
-
 	vmw_fb_dirty_mark(par, par->fb_x, par->fb_y,
 			  par->set_fb->width, par->set_fb->height);
 
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
@@ -354,6 +354,7 @@ void vmw_dmabuf_bo_free(struct ttm_buffe
 {
 	struct vmw_dma_buffer *vmw_bo = vmw_dma_buffer(bo);
 
+	vmw_dma_buffer_unmap(vmw_bo);
 	kfree(vmw_bo);
 }
 
@@ -361,6 +362,7 @@ static void vmw_user_dmabuf_destroy(stru
 {
 	struct vmw_user_dma_buffer *vmw_user_bo = vmw_user_dma_buffer(bo);
 
+	vmw_dma_buffer_unmap(&vmw_user_bo->dma);
 	ttm_prime_object_kfree(vmw_user_bo, prime);
 }
 
@@ -1239,6 +1241,12 @@ void vmw_resource_move_notify(struct ttm
 
 	dma_buf = container_of(bo, struct vmw_dma_buffer, base);
 
+	/*
+	 * Kill any cached kernel maps before move. An optimization could
+	 * be to do this iff source or destination memory type is VRAM.
+	 */
+	vmw_dma_buffer_unmap(dma_buf);
+
 	if (mem->mem_type != VMW_PL_MOB) {
 		struct vmw_resource *res, *n;
 		struct ttm_validate_buffer val_buf;
@@ -1262,6 +1270,21 @@ void vmw_resource_move_notify(struct ttm
 }
 
 
+/**
+ * vmw_resource_swap_notify - swapout notify callback.
+ *
+ * @bo: The buffer object to be swapped out.
+ */
+void vmw_resource_swap_notify(struct ttm_buffer_object *bo)
+{
+	if (bo->destroy != vmw_dmabuf_bo_free &&
+	    bo->destroy != vmw_user_dmabuf_destroy)
+		return;
+
+	/* Kill any cached kernel maps before swapout */
+	vmw_dma_buffer_unmap(vmw_dma_buffer(bo));
+}
+
 
 /**
  * vmw_query_readback_all - Read back cached query states