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vmwgfx fixes for regressions in 5.12

Browse source 
Here's a set of 3 patches fixing ugly regressions
 in the vmwgfx driver. We broke lock initialization
 code and ended up using spinlocks before initialization
 breaking lockdep.
 Also there was a bit of a fallout from drm changes
 which made the core validate that unreferenced buffers
 have been unpinned. vmwgfx pinning code predates a lot
 of the core drm and wasn't written to account for those
 semantics. Fortunately changes required to fix it
 are not too intrusive.
 The changes have been validated by our internal ci.
 
 Signed-off-by: Zack Rusin <zackr@vmware.com>
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Merge tag 'vmwgfx-fixes-2021-04-14' of gitlab.freedesktop.org:zack/vmwgfx into drm-fixes

vmwgfx fixes for regressions in 5.12

Here's a set of 3 patches fixing ugly regressions
in the vmwgfx driver. We broke lock initialization
code and ended up using spinlocks before initialization
breaking lockdep.
Also there was a bit of a fallout from drm changes
which made the core validate that unreferenced buffers
have been unpinned. vmwgfx pinning code predates a lot
of the core drm and wasn't written to account for those
semantics. Fortunately changes required to fix it
are not too intrusive.
The changes have been validated by our internal ci.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Zack Rusin <zackr@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/f7add0a2-162e-3bd2-b1be-344a94f2acbf@vmware.com
This commit is contained in:
Dave Airlie 2021-04-18 09:26:54 +10:00
commit 796b556cbf
4 changed files with 28 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
drivers/gpu/drm/vmwgfx/vmwgfx_cotable.c
View file

@ -481,11 +481,15 @@ static int vmw_cotable_resize(struct vmw_resource *res, size_t new_size)
vmw_bo_unreference(&old_buf);
res->id = vcotbl->type;
/* Release the pin acquired in vmw_bo_init */
ttm_bo_unpin(bo);
return 0;
out_map_new:
ttm_bo_kunmap(&old_map);
out_wait:
ttm_bo_unpin(bo);
ttm_bo_unreserve(bo);
vmw_bo_unreference(&buf);

19
drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
View file

@ -712,6 +712,15 @@ static int vmw_driver_load(struct vmw_private *dev_priv, u32 pci_id)
dev_priv->last_read_seqno = (uint32_t) -100;
dev_priv->drm.dev_private = dev_priv;
mutex_init(&dev_priv->cmdbuf_mutex);
mutex_init(&dev_priv->binding_mutex);
ttm_lock_init(&dev_priv->reservation_sem);
spin_lock_init(&dev_priv->resource_lock);
spin_lock_init(&dev_priv->hw_lock);
spin_lock_init(&dev_priv->waiter_lock);
spin_lock_init(&dev_priv->cap_lock);
spin_lock_init(&dev_priv->cursor_lock);
ret = vmw_setup_pci_resources(dev_priv, pci_id);
if (ret)
return ret;
@ -719,16 +728,6 @@ static int vmw_driver_load(struct vmw_private *dev_priv, u32 pci_id)
if (ret)
goto out_no_pci_or_version;
mutex_init(&dev_priv->cmdbuf_mutex);
mutex_init(&dev_priv->release_mutex);
mutex_init(&dev_priv->binding_mutex);
mutex_init(&dev_priv->global_kms_state_mutex);
ttm_lock_init(&dev_priv->reservation_sem);
spin_lock_init(&dev_priv->resource_lock);
spin_lock_init(&dev_priv->hw_lock);
spin_lock_init(&dev_priv->waiter_lock);
spin_lock_init(&dev_priv->cap_lock);
spin_lock_init(&dev_priv->cursor_lock);
for (i = vmw_res_context; i < vmw_res_max; ++i) {
idr_init(&dev_priv->res_idr[i]);

5
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
View file

@ -529,7 +529,6 @@ struct vmw_private {
struct vmw_overlay *overlay_priv;
struct drm_property *hotplug_mode_update_property;
struct drm_property *implicit_placement_property;
struct mutex global_kms_state_mutex;
spinlock_t cursor_lock;
struct drm_atomic_state *suspend_state;
@ -592,7 +591,6 @@ struct vmw_private {
bool refuse_hibernation;
bool suspend_locked;
struct mutex release_mutex;
atomic_t num_fifo_resources;
/*
@ -1524,9 +1522,8 @@ static inline void vmw_bo_unreference(struct vmw_buffer_object **buf)
struct vmw_buffer_object *tmp_buf = *buf;
*buf = NULL;
if (tmp_buf != NULL) {
if (tmp_buf != NULL)
ttm_bo_put(&tmp_buf->base);
}
}
static inline struct vmw_buffer_object *

14
drivers/gpu/drm/vmwgfx/vmwgfx_mob.c
View file

@ -94,6 +94,16 @@ static void vmw_mob_pt_setup(struct vmw_mob *mob,
struct vmw_piter data_iter,
unsigned long num_data_pages);
static inline void vmw_bo_unpin_unlocked(struct ttm_buffer_object *bo)
{
int ret = ttm_bo_reserve(bo, false, true, NULL);
BUG_ON(ret != 0);
ttm_bo_unpin(bo);
ttm_bo_unreserve(bo);
}
/*
* vmw_setup_otable_base - Issue an object table base setup command to
* the device
@ -277,6 +287,7 @@ static int vmw_otable_batch_setup(struct vmw_private *dev_priv,
&batch->otables[i]);
}
vmw_bo_unpin_unlocked(batch->otable_bo);
ttm_bo_put(batch->otable_bo);
batch->otable_bo = NULL;
return ret;
@ -340,6 +351,7 @@ static void vmw_otable_batch_takedown(struct vmw_private *dev_priv,
BUG_ON(ret != 0);
vmw_bo_fence_single(bo, NULL);
ttm_bo_unpin(bo);
ttm_bo_unreserve(bo);
ttm_bo_put(batch->otable_bo);
@ -528,6 +540,7 @@ static void vmw_mob_pt_setup(struct vmw_mob *mob,
void vmw_mob_destroy(struct vmw_mob *mob)
{
if (mob->pt_bo) {
vmw_bo_unpin_unlocked(mob->pt_bo);
ttm_bo_put(mob->pt_bo);
mob->pt_bo = NULL;
}
@ -643,6 +656,7 @@ int vmw_mob_bind(struct vmw_private *dev_priv,
out_no_cmd_space:
vmw_fifo_resource_dec(dev_priv);
if (pt_set_up) {
vmw_bo_unpin_unlocked(mob->pt_bo);
ttm_bo_put(mob->pt_bo);
mob->pt_bo = NULL;
}