int i915_gem_context_init(struct drm_i915_private *dev_priv)
{
struct i915_gem_context *ctx;
/* Init should only be called once per module load. Eventually the
* restriction on the context_disabled check can be loosened. */
if (WARN_ON(dev_priv->kernel_context))
return 0;
if (intel_vgpu_active(dev_priv) &&
HAS_LOGICAL_RING_CONTEXTS(dev_priv)) {
if (!i915.enable_execlists) {
DRM_INFO("Only EXECLIST mode is supported in vgpu.\n");
return -EINVAL;
}
}
/* Using the simple ida interface, the max is limited by sizeof(int) */
BUILD_BUG_ON(MAX_CONTEXT_HW_ID > INT_MAX);
ida_init(&dev_priv->context_hw_ida);
if (i915.enable_execlists) {
/* NB: intentionally left blank. We will allocate our own
* backing objects as we need them, thank you very much */
dev_priv->hw_context_size = 0;
} else if (HAS_HW_CONTEXTS(dev_priv)) {
dev_priv->hw_context_size =
round_up(get_context_size(dev_priv),
I915_GTT_PAGE_SIZE);
if (dev_priv->hw_context_size > (1<<20)) {
DRM_DEBUG_DRIVER("Disabling HW Contexts; invalid size %d\n",
dev_priv->hw_context_size);
dev_priv->hw_context_size = 0;
}
}
ctx = i915_gem_create_context(dev_priv, NULL);
if (IS_ERR(ctx)) {
DRM_ERROR("Failed to create default global context (error %ld)\n",
PTR_ERR(ctx));
return PTR_ERR(ctx);
}
/* For easy recognisablity, we want the kernel context to be 0 and then
* all user contexts will have non-zero hw_id.
*/
GEM_BUG_ON(ctx->hw_id);
i915_gem_context_clear_bannable(ctx);
ctx->priority = I915_PRIORITY_MIN; /* lowest priority; idle task */
dev_priv->kernel_context = ctx;
GEM_BUG_ON(!i915_gem_context_is_kernel(ctx));
DRM_DEBUG_DRIVER("%s context support initialized\n",
i915.enable_execlists ? "LR" :
dev_priv->hw_context_size ? "HW" : "fake");
return 0;
}
int i915_gem_context_init(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_context *ctx;
int i;
/* Init should only be called once per module load. Eventually the
* restriction on the context_disabled check can be loosened. */
if (WARN_ON(dev_priv->ring[RCS].default_context))
return 0;
if (i915.enable_execlists) {
/* NB: intentionally left blank. We will allocate our own
* backing objects as we need them, thank you very much */
dev_priv->hw_context_size = 0;
} else if (HAS_HW_CONTEXTS(dev)) {
dev_priv->hw_context_size = round_up(get_context_size(dev), 4096);
if (dev_priv->hw_context_size > (1<<20)) {
DRM_DEBUG_DRIVER("Disabling HW Contexts; invalid size %d\n",
dev_priv->hw_context_size);
dev_priv->hw_context_size = 0;
}
}
ctx = i915_gem_create_context(dev, NULL);
if (IS_ERR(ctx)) {
DRM_ERROR("Failed to create default global context (error %ld)\n",
PTR_ERR(ctx));
return PTR_ERR(ctx);
}
for (i = 0; i < I915_NUM_RINGS; i++) {
struct intel_engine_cs *ring = &dev_priv->ring[i];
/* NB: RCS will hold a ref for all rings */
ring->default_context = ctx;
}
DRM_DEBUG_DRIVER("%s context support initialized\n",
i915.enable_execlists ? "LR" :
dev_priv->hw_context_size ? "HW" : "fake");
return 0;
}