We currently verify that all doorbells can be registerd with GuC and
HW but don't check that all works as expected after a db ring.
Do a nop ring of all doorbells to make sure we haven't misprogrammed
any WQ or stage descriptor data. This will also help validating
upcoming changes in the db programming flow.
Cc: Michel Thierry <michel.thie...@intel.com>
Cc: Michal Wajdeczko <michal.wajdec...@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospu...@intel.com>
---
drivers/gpu/drm/i915/intel_guc_fwif.h | 1 +
drivers/gpu/drm/i915/intel_guc_submission.c | 25 +++++++++-----
drivers/gpu/drm/i915/intel_guc_submission.h | 4 +++
drivers/gpu/drm/i915/selftests/intel_guc.c | 38 +++++++++++++++++++++
4 files changed, 59 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_guc_fwif.h
b/drivers/gpu/drm/i915/intel_guc_fwif.h
index 1a0f2a39cef9..8382d591c784 100644
--- a/drivers/gpu/drm/i915/intel_guc_fwif.h
+++ b/drivers/gpu/drm/i915/intel_guc_fwif.h
@@ -49,6 +49,7 @@
#define WQ_TYPE_BATCH_BUF (0x1 << WQ_TYPE_SHIFT)
#define WQ_TYPE_PSEUDO (0x2 << WQ_TYPE_SHIFT)
#define WQ_TYPE_INORDER (0x3 << WQ_TYPE_SHIFT)
+#define WQ_TYPE_NOOP (0x4 << WQ_TYPE_SHIFT)
#define WQ_TARGET_SHIFT 10
#define WQ_LEN_SHIFT 16
#define WQ_NO_WCFLUSH_WAIT (1 << 27)
diff --git a/drivers/gpu/drm/i915/intel_guc_submission.c
b/drivers/gpu/drm/i915/intel_guc_submission.c
index 195adbd0ebf7..07b9d313b019 100644
--- a/drivers/gpu/drm/i915/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/intel_guc_submission.c
@@ -456,6 +456,9 @@ static void guc_wq_item_append(struct intel_guc_client
*client,
*/
BUILD_BUG_ON(wqi_size != 16);
+ /* We expect the WQ to be active if we're appending items to it */
+ GEM_BUG_ON(desc->wq_status != WQ_STATUS_ACTIVE);
+
/* Free space is guaranteed. */
wq_off = READ_ONCE(desc->tail);
GEM_BUG_ON(CIRC_SPACE(wq_off, READ_ONCE(desc->head),
@@ -465,15 +468,19 @@ static void guc_wq_item_append(struct intel_guc_client
*client,
/* WQ starts from the page after doorbell / process_desc */
wqi = client->vaddr + wq_off + GUC_DB_SIZE;
- /* Now fill in the 4-word work queue item */
- wqi->header = WQ_TYPE_INORDER |
- (wqi_len << WQ_LEN_SHIFT) |
- (target_engine << WQ_TARGET_SHIFT) |
- WQ_NO_WCFLUSH_WAIT;
- wqi->context_desc = context_desc;
- wqi->submit_element_info = ring_tail << WQ_RING_TAIL_SHIFT;
- GEM_BUG_ON(ring_tail > WQ_RING_TAIL_MAX);
- wqi->fence_id = fence_id;
+ if (I915_SELFTEST_ONLY(client->use_nop_wqi)) {
+ wqi->header = WQ_TYPE_NOOP | (wqi_len << WQ_LEN_SHIFT);
+ } else {
+ /* Now fill in the 4-word work queue item */
+ wqi->header = WQ_TYPE_INORDER |
+ (wqi_len << WQ_LEN_SHIFT) |
+ (target_engine << WQ_TARGET_SHIFT) |
+ WQ_NO_WCFLUSH_WAIT;
+ wqi->context_desc = context_desc;
+ wqi->submit_element_info = ring_tail << WQ_RING_TAIL_SHIFT;
+ GEM_BUG_ON(ring_tail > WQ_RING_TAIL_MAX);
+ wqi->fence_id = fence_id;
+ }
/* Make the update visible to GuC */
WRITE_ONCE(desc->tail, (wq_off + wqi_size) & (GUC_WQ_SIZE - 1));
diff --git a/drivers/gpu/drm/i915/intel_guc_submission.h
b/drivers/gpu/drm/i915/intel_guc_submission.h
index fb081cefef93..169c54568340 100644
--- a/drivers/gpu/drm/i915/intel_guc_submission.h
+++ b/drivers/gpu/drm/i915/intel_guc_submission.h
@@ -28,6 +28,7 @@
#include <linux/spinlock.h>
#include "i915_gem.h"
+#include "i915_selftest.h"
struct drm_i915_private;
@@ -71,6 +72,9 @@ struct intel_guc_client {
spinlock_t wq_lock;
/* Per-engine counts of GuC submissions */
u64 submissions[I915_NUM_ENGINES];
+
+ /* For testing purposes, use nop WQ items instead of real ones */
+ I915_SELFTEST_DECLARE(bool use_nop_wqi);
};
int intel_guc_submission_init(struct intel_guc *guc);
diff --git a/drivers/gpu/drm/i915/selftests/intel_guc.c
b/drivers/gpu/drm/i915/selftests/intel_guc.c
index 407c98fb9170..3154fd2f625d 100644
--- a/drivers/gpu/drm/i915/selftests/intel_guc.c
+++ b/drivers/gpu/drm/i915/selftests/intel_guc.c
@@ -65,6 +65,40 @@ static int check_all_doorbells(struct intel_guc *guc)
return 0;
}
+static int ring_doorbell_nop(struct intel_guc_client *client)
+{
+ int err;
+ struct guc_process_desc *desc = __get_process_desc(client);
+
+ client->use_nop_wqi = true;
+
+ spin_lock_irq(&client->wq_lock);
+
+ guc_wq_item_append(client, 0, 0, 0, 0);
+ guc_ring_doorbell(client);
+
+ spin_unlock_irq(&client->wq_lock);
+
+ client->use_nop_wqi = false;
+
+ /* if there are no issues GuC will update the WQ head and keep the
+ * WQ in active status
+ */
+ err = wait_for(READ_ONCE(desc->head) == READ_ONCE(desc->tail), 10);
+ if (err) {
+ pr_err("doorbell %u ring failed!\n", client->doorbell_id);
+ return -EIO;
+ }
+
+ if (desc->wq_status != WQ_STATUS_ACTIVE) {
+ pr_err("doorbell %u ring put WQ in bad state (%u)!\n",
+ client->doorbell_id, desc->wq_status);
+ return -EIO;
+ }
+
+ return 0;
+}
+
/*
* Basic client sanity check, handy to validate create_clients.
*/
@@ -332,6 +366,10 @@ static int igt_guc_doorbells(void *arg)
err = check_all_doorbells(guc);
if (err)
goto out;
+
+ err = ring_doorbell_nop(clients[i]);
+ if (err)
+ goto out;
}
out:
--
2.18.0
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