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drm/vmwgfx: Clean up fbdev modeset locking

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At least since the atomic port, the vmwgfx fbdev code is taking
a number of unnecessary modeset locks. In particular the
kms_set_config() function will grab its own locks, leading to
locking retries. So avoid drm_modeset_lock_all() and instead
provide a local acquire context for kms_set_config(). Also have the
vmw_kms_fbdev_init data itself grab the lock that it needs.

This also fixed a long standing problem that vmw_fb_close() didn't
provide an acquire context for kms_set_config(), causing potential
warnings and hangs during driver unload. This problem was uncovered by the
recent commit "drm/vmwgfx: Improve on hibernation"

Testing done:
Repeated driver load and unload on Ubuntu 16.04.2

Fixes: c3b9b16573 ("drm/vmwgfx: Improve on hibernation")
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Deepak Rawat <drawat@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
This commit is contained in:
Thomas Hellstrom
2018-04-26 09:48:55 +02:00
parent bb1278e891
commit 21fbd085e6
2 changed files with 20 additions and 24 deletions
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13
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
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@@ -2680,7 +2680,9 @@ int vmw_kms_fbdev_init_data(struct vmw_private *dev_priv,
struct vmw_display_unit *du;
struct drm_display_mode *mode;
int i = 0;
int ret = 0;
mutex_lock(&dev_priv->dev->mode_config.mutex);
list_for_each_entry(con, &dev_priv->dev->mode_config.connector_list,
head) {
if (i == unit)
@@ -2691,7 +2693,8 @@ int vmw_kms_fbdev_init_data(struct vmw_private *dev_priv,
if (i != unit) {
DRM_ERROR("Could not find initial display unit.\n");
return -EINVAL;
ret = -EINVAL;
goto out_unlock;
}
if (list_empty(&con->modes))
@@ -2699,7 +2702,8 @@ int vmw_kms_fbdev_init_data(struct vmw_private *dev_priv,
if (list_empty(&con->modes)) {
DRM_ERROR("Could not find initial display mode.\n");
return -EINVAL;
ret = -EINVAL;
goto out_unlock;
}
du = vmw_connector_to_du(con);
@@ -2720,7 +2724,10 @@ int vmw_kms_fbdev_init_data(struct vmw_private *dev_priv,
head);
}
return 0;
out_unlock:
mutex_unlock(&dev_priv->dev->mode_config.mutex);
return ret;
}
/**