/**
* The default context needs to exist per ring that uses contexts. It stores the
* context state of the GPU for applications that don't utilize HW contexts, as
* well as an idle case.
*/
static int create_default_context(struct drm_i915_private *dev_priv)
{
struct i915_hw_context *ctx;
int ret;
BUG_ON(!mutex_is_locked(&dev_priv->dev->struct_mutex));
ctx = create_hw_context(dev_priv->dev, NULL);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
/* We may need to do things with the shrinker which require us to
* immediately switch back to the default context. This can cause a
* problem as pinning the default context also requires GTT space which
* may not be available. To avoid this we always pin the
* default context.
*/
dev_priv->ring[RCS].default_context = ctx;
ret = i915_gem_object_pin(ctx->obj, CONTEXT_ALIGN, false);
if (ret) {
do_destroy(ctx);
return ret;
}
ret = do_switch(NULL, ctx, 0);
if (ret) {
i915_gem_object_unpin(ctx->obj);
do_destroy(ctx);
} else {
DRM_DEBUG_DRIVER("Default HW context loaded\n");
}
return ret;
}
int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
struct drm_file *file)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_i915_gem_context_create *args = data;
struct drm_i915_file_private *file_priv = file->driver_priv;
struct i915_hw_context *ctx;
int ret;
if (!(dev->driver->driver_features & DRIVER_GEM))
return -ENODEV;
if (dev_priv->hw_contexts_disabled)
return -ENODEV;
ret = i915_mutex_lock_interruptible(dev);
if (ret)
return ret;
ctx = create_hw_context(dev, file_priv);
mutex_unlock(&dev->struct_mutex);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
args->ctx_id = ctx->id;
DRM_DEBUG_DRIVER("HW context %d created\n", args->ctx_id);
return 0;
}
/**
* The default context needs to exist per ring that uses contexts. It stores the
* context state of the GPU for applications that don't utilize HW contexts, as
* well as an idle case.
*/
static int create_default_context(struct drm_i915_private *dev_priv)
{
struct i915_hw_context *ctx;
int ret;
DRM_LOCK_ASSERT(dev_priv->dev);
ret = create_hw_context(dev_priv->dev, NULL, &ctx);
if (ret != 0)
return (ret);
/* We may need to do things with the shrinker which require us to
* immediately switch back to the default context. This can cause a
* problem as pinning the default context also requires GTT space which
* may not be available. To avoid this we always pin the
* default context.
*/
dev_priv->rings[RCS].default_context = ctx;
ret = i915_gem_object_pin(ctx->obj, CONTEXT_ALIGN, false);
if (ret)
goto err_destroy;
ret = do_switch(ctx);
if (ret)
goto err_unpin;
DRM_DEBUG_DRIVER("Default HW context loaded\n");
return 0;
err_unpin:
i915_gem_object_unpin(ctx->obj);
err_destroy:
do_destroy(ctx);
return ret;
}
