From 2ddb4389a782e39c65bd3538e7878f21e2c61cd2 Mon Sep 17 00:00:00 2001
From: Zack Rusin <zackr@vmware.com>
Date: Wed, 20 Apr 2022 00:03:28 -0400
Subject: drm/vmwgfx: Fix gem refcounting and memory evictions
Git-commit: 298799a28264ce400d9ff95c51b7adcb123d866e
Patch-mainline: v5.18-rc4
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
v2: Add the last part of the ref count fix which was spotted by
Philipp Sieweck where the ref count of cpu writers is off due to
ERESTARTSYS or EBUSY during bo waits.
The initial GEM port broke refcounting on shareable (prime) surfaces and
memory evictions. The prime surfaces broke because the parent surfaces
weren't increasing the ref count on GEM surfaces, which meant that
the memory backing textures could have been deleted while the texture
was still accessible. The evictions broke due to a typo, the code was
supposed to exit if the passed buffers were not vmw_buffer_object
not if they were. They're tied because the evictions depend on having
memory to actually evict.
This fixes crashes with XA state tracker which is used for xrender
acceleration on xf86-video-vmware, apps/tests which use a lot of
memory (a good test being the piglit's streaming-texture-leak) and
desktops.
Signed-off-by: Zack Rusin <zackr@vmware.com>
Fixes: 8afa13a0583f ("drm/vmwgfx: Implement DRIVER_GEM")
Reported-by: Philipp Sieweck <psi@informatik.uni-kiel.de>
Cc: <stable@vger.kernel.org> # v5.17+
Reviewed-by: Maaz Mombasawala <mombasawalam@vmware.com>
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220420040328.1007409-1-zack@kde.org
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/vmwgfx/vmwgfx_bo.c | 43 ++++++++++++-------------
drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 8 ++---
drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 7 +++-
3 files changed, 28 insertions(+), 30 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
index 31aecc46624b..04c8a378aeed 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
@@ -46,6 +46,21 @@ vmw_buffer_object(struct ttm_buffer_object *bo)
return container_of(bo, struct vmw_buffer_object, base);
}
+/**
+ * bo_is_vmw - check if the buffer object is a &vmw_buffer_object
+ * @bo: ttm buffer object to be checked
+ *
+ * Uses destroy function associated with the object to determine if this is
+ * a &vmw_buffer_object.
+ *
+ * Returns:
+ * true if the object is of &vmw_buffer_object type, false if not.
+ */
+static bool bo_is_vmw(struct ttm_buffer_object *bo)
+{
+ return bo->destroy == &vmw_bo_bo_free ||
+ bo->destroy == &vmw_gem_destroy;
+}
/**
* vmw_bo_pin_in_placement - Validate a buffer to placement.
@@ -615,8 +630,9 @@ int vmw_user_bo_synccpu_ioctl(struct drm_device *dev, void *data,
ret = vmw_user_bo_synccpu_grab(vbo, arg->flags);
vmw_bo_unreference(&vbo);
- if (unlikely(ret != 0 && ret != -ERESTARTSYS &&
- ret != -EBUSY)) {
+ if (unlikely(ret != 0)) {
+ if (ret == -ERESTARTSYS || ret == -EBUSY)
+ return -EBUSY;
DRM_ERROR("Failed synccpu grab on handle 0x%08x.\n",
(unsigned int) arg->handle);
return ret;
@@ -798,7 +814,7 @@ int vmw_dumb_create(struct drm_file *file_priv,
void vmw_bo_swap_notify(struct ttm_buffer_object *bo)
{
/* Is @bo embedded in a struct vmw_buffer_object? */
- if (vmw_bo_is_vmw_bo(bo))
+ if (!bo_is_vmw(bo))
return;
/* Kill any cached kernel maps before swapout */
@@ -822,7 +838,7 @@ void vmw_bo_move_notify(struct ttm_buffer_object *bo,
struct vmw_buffer_object *vbo;
/* Make sure @bo is embedded in a struct vmw_buffer_object? */
- if (vmw_bo_is_vmw_bo(bo))
+ if (!bo_is_vmw(bo))
return;
vbo = container_of(bo, struct vmw_buffer_object, base);
@@ -843,22 +859,3 @@ void vmw_bo_move_notify(struct ttm_buffer_object *bo,
if (mem->mem_type != VMW_PL_MOB && bo->resource->mem_type == VMW_PL_MOB)
vmw_resource_unbind_list(vbo);
}
-
-/**
- * vmw_bo_is_vmw_bo - check if the buffer object is a &vmw_buffer_object
- * @bo: buffer object to be checked
- *
- * Uses destroy function associated with the object to determine if this is
- * a &vmw_buffer_object.
- *
- * Returns:
- * true if the object is of &vmw_buffer_object type, false if not.
- */
-bool vmw_bo_is_vmw_bo(struct ttm_buffer_object *bo)
-{
- if (bo->destroy == &vmw_bo_bo_free ||
- bo->destroy == &vmw_gem_destroy)
- return true;
-
- return false;
-}
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 26eb5478394a..163c00793eb1 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -998,13 +998,10 @@ static int vmw_driver_load(struct vmw_private *dev_priv, u32 pci_id)
goto out_no_fman;
}
- drm_vma_offset_manager_init(&dev_priv->vma_manager,
- DRM_FILE_PAGE_OFFSET_START,
- DRM_FILE_PAGE_OFFSET_SIZE);
ret = ttm_device_init(&dev_priv->bdev, &vmw_bo_driver,
dev_priv->drm.dev,
dev_priv->drm.anon_inode->i_mapping,
- &dev_priv->vma_manager,
+ dev_priv->drm.vma_offset_manager,
dev_priv->map_mode == vmw_dma_alloc_coherent,
false);
if (unlikely(ret != 0)) {
@@ -1174,7 +1171,6 @@ static void vmw_driver_unload(struct drm_device *dev)
vmw_devcaps_destroy(dev_priv);
vmw_vram_manager_fini(dev_priv);
ttm_device_fini(&dev_priv->bdev);
- drm_vma_offset_manager_destroy(&dev_priv->vma_manager);
vmw_release_device_late(dev_priv);
vmw_fence_manager_takedown(dev_priv->fman);
if (dev_priv->capabilities & SVGA_CAP_IRQMASK)
@@ -1398,7 +1394,7 @@ vmw_get_unmapped_area(struct file *file, unsigned long uaddr,
struct vmw_private *dev_priv = vmw_priv(file_priv->minor->dev);
return drm_get_unmapped_area(file, uaddr, len, pgoff, flags,
- &dev_priv->vma_manager);
+ dev_priv->drm.vma_offset_manager);
}
static int vmwgfx_pm_notifier(struct notifier_block *nb, unsigned long val,
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index 00e8e27e4884..ace7ca150b03 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -683,6 +683,9 @@ static void vmw_user_surface_base_release(struct ttm_base_object **p_base)
container_of(base, struct vmw_user_surface, prime.base);
struct vmw_resource *res = &user_srf->srf.res;
+ if (base->shareable && res && res->backup)
+ drm_gem_object_put(&res->backup->base.base);
+
*p_base = NULL;
vmw_resource_unreference(&res);
}
@@ -857,6 +860,7 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
goto out_unlock;
}
vmw_bo_reference(res->backup);
+ drm_gem_object_get(&res->backup->base.base);
}
tmp = vmw_resource_reference(&srf->res);
@@ -1513,7 +1517,6 @@ vmw_gb_surface_define_internal(struct drm_device *dev,
&res->backup);
if (ret == 0)
vmw_bo_reference(res->backup);
-
}
if (unlikely(ret != 0)) {
@@ -1561,6 +1564,8 @@ vmw_gb_surface_define_internal(struct drm_device *dev,
drm_vma_node_offset_addr(&res->backup->base.base.vma_node);
rep->buffer_size = res->backup->base.base.size;
rep->buffer_handle = backup_handle;
+ if (user_srf->prime.base.shareable)
+ drm_gem_object_get(&res->backup->base.base);
} else {
rep->buffer_map_handle = 0;
rep->buffer_size = 0;
--
2.38.1