The vkCmd*() functions do not report errors, instead, any errors should be
reported by the time we call vkEndCommandBuffer(). This means that we
need to make the driver robust against incosistent and/or imcomplete
command buffer states through the command recording process, particularly,
avoid crashes due to access to memory that we failed to allocate previously.
The strategy used to do this is to track the first error ocurred while
recording a command buffer in the batch associated with it. We use the
batch to track this information because the command buffer may not be
visible to all parts of the driver that can produce errors we need to be
aware of (such as allocation failures during batch emissions).
Later patches will use this error information to guard parts of the driver
that may not be safe to execute.
v2: Move the field from the command buffer to the batch so we can track
errors from batch emissions (Jason)
---
src/intel/vulkan/anv_cmd_buffer.c | 5 +++++
src/intel/vulkan/anv_private.h | 9 +++++++++
2 files changed, 14 insertions(+)
diff --git a/src/intel/vulkan/anv_cmd_buffer.c
b/src/intel/vulkan/anv_cmd_buffer.c
index cab1dd7..4a41bc0 100644
--- a/src/intel/vulkan/anv_cmd_buffer.c
+++ b/src/intel/vulkan/anv_cmd_buffer.c
@@ -117,6 +117,8 @@ anv_cmd_state_reset(struct anv_cmd_buffer *cmd_buffer)
{
struct anv_cmd_state *state = &cmd_buffer->state;
+ cmd_buffer->batch.status = VK_SUCCESS;
+
memset(&state->descriptors, 0, sizeof(state->descriptors));
memset(&state->push_constants, 0, sizeof(state->push_constants));
memset(state->binding_tables, 0, sizeof(state->binding_tables));
@@ -185,6 +187,8 @@ static VkResult anv_create_cmd_buffer(
if (cmd_buffer == NULL)
return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);
+ cmd_buffer->batch.status = VK_SUCCESS;
+
cmd_buffer->_loader_data.loaderMagic = ICD_LOADER_MAGIC;
cmd_buffer->device = device;
cmd_buffer->pool = pool;
@@ -217,6 +221,7 @@ static VkResult anv_create_cmd_buffer(
return VK_SUCCESS;
fail:
+ cmd_buffer->batch.status = result;
vk_free(&cmd_buffer->pool->alloc, cmd_buffer);
return result;
diff --git a/src/intel/vulkan/anv_private.h b/src/intel/vulkan/anv_private.h
index aa2b6d7..f5d7600 100644
--- a/src/intel/vulkan/anv_private.h
+++ b/src/intel/vulkan/anv_private.h
@@ -704,6 +704,15 @@ struct anv_batch {
*/
VkResult (*extend_cb)(struct anv_batch *, void *);
void * user_data;
+
+ /**
+ * Current error status of the command buffer. Used to track inconsistent
+ * or incomplete command buffer states that are the consequence of run-time
+ * errors such as out of memory scenarios. We want to track this in the
+ * batch because the command buffer object is not visible to some parts
+ * of the driver.
+ */
+ VkResult status;
};
void *anv_batch_emit_dwords(struct anv_batch *batch, int num_dwords);
--
2.7.4
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