[PATCH 09/13] drm/i915/guc: A little bit more of doorbell sanitization
Oscar Mateo
oscar.mateo at intel.com
Mon Mar 20 17:04:07 UTC 2017
Some recent refactoring patches have left the doorbell creation outside
the GuC client allocation, which does not make a lot of sense (a client
without a doorbell is something useless). Move it back there, and
refactor the init_doorbell_hw consequently.
Thanks to this, we can do some other improvements, like hoisting the
check for GuC submission enabled out of the enable function.
v2: Rebased.
Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Arkadiusz Hiler <arkadiusz.hiler at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Signed-off-by: Oscar Mateo <oscar.mateo at intel.com>
---
drivers/gpu/drm/i915/i915_guc_submission.c | 231 ++++++++++++++++-------------
drivers/gpu/drm/i915/intel_uc.c | 21 +--
2 files changed, 138 insertions(+), 114 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index 143ef26..67084e5 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -162,15 +162,13 @@ static struct guc_context_desc *__get_context_desc(struct i915_guc_client *clien
* client object which contains the page being used for the doorbell
*/
-static int __update_doorbell_desc(struct i915_guc_client *client, u16 new_id)
+static void __update_doorbell_desc(struct i915_guc_client *client, u16 new_id)
{
struct guc_context_desc *desc;
/* Update the GuC's idea of the doorbell ID */
desc = __get_context_desc(client);
desc->db_id = new_id;
-
- return 0;
}
static struct guc_doorbell_info *__get_doorbell(struct i915_guc_client *client)
@@ -225,6 +223,28 @@ static int __destroy_doorbell(struct i915_guc_client *client)
return __guc_deallocate_doorbell(client->guc, client->ctx_index);
}
+static int create_doorbell(struct i915_guc_client *client)
+{
+ int ret;
+
+ ret = __reserve_doorbell(client);
+ if (ret)
+ return ret;
+
+ __update_doorbell_desc(client, client->doorbell_id);
+
+ ret = __create_doorbell(client);
+ if (ret)
+ goto err;
+
+ return 0;
+
+err:
+ __update_doorbell_desc(client, GUC_DOORBELL_INVALID);
+ __unreserve_doorbell(client);
+ return ret;
+}
+
static int destroy_doorbell(struct i915_guc_client *client)
{
int err;
@@ -494,6 +514,17 @@ static void guc_wq_item_append(struct i915_guc_client *client,
wqi->fence_id = rq->global_seqno;
}
+static void guc_reset_wq(struct i915_guc_client *client)
+{
+ struct guc_process_desc *desc = client->vaddr +
+ client->proc_desc_offset;
+
+ desc->head = 0;
+ desc->tail = 0;
+
+ client->wq_tail = 0;
+}
+
static int guc_ring_doorbell(struct i915_guc_client *client)
{
struct guc_process_desc *desc;
@@ -749,19 +780,6 @@ struct i915_vma *intel_guc_allocate_vma(struct intel_guc *guc, u32 size)
return vma;
}
-static void guc_client_free(struct i915_guc_client *client)
-{
- /*
- * XXX: wait for any outstanding submissions before freeing memory.
- * Be sure to drop any locks
- */
- guc_ctx_desc_fini(client->guc, client);
- i915_gem_object_unpin_map(client->vma->obj);
- i915_vma_unpin_and_release(&client->vma);
- ida_simple_remove(&client->guc->ctx_ids, client->ctx_index);
- kfree(client);
-}
-
/* Check that a doorbell register is in the expected state */
static bool doorbell_ok(struct intel_guc *guc, u16 db_id)
{
@@ -792,9 +810,8 @@ static int __reset_doorbell(struct i915_guc_client* client, u16 db_id)
{
int err;
- err = __update_doorbell_desc(client, db_id);
- if (!err)
- err = __create_doorbell(client);
+ __update_doorbell_desc(client, db_id);
+ err = __create_doorbell(client);
if (!err)
err = __destroy_doorbell(client);
@@ -802,48 +819,61 @@ static int __reset_doorbell(struct i915_guc_client* client, u16 db_id)
}
/*
- * Borrow the first client to set up & tear down each unused doorbell
- * in turn, to ensure that all doorbell h/w is (re)initialised.
+ * Set up & tear down each unused doorbell in turn, to ensure that all doorbell
+ * HW is (re)initialised. For that end, we might have to borrow the first
+ * client. Also, tell GuC about all the doorbells in use by all clients.
+ * We do this because the KMD, the GuC and the doorbell HW can easily go out of
+ * sync (e.g. we can reset the GuC, but not the doorbel HW).
*/
static int guc_init_doorbell_hw(struct intel_guc *guc)
{
struct i915_guc_client *client = guc->execbuf_client;
- int err;
- int i;
-
- if (has_doorbell(client))
- destroy_doorbell(client);
+ bool recreate_first_client = false;
+ u16 db_id;
+ int ret;
- for (i = 0; i < GUC_NUM_DOORBELLS; ++i) {
- if (doorbell_ok(guc, i))
+ /* For unused doorbells, make sure they are disabled */
+ for_each_clear_bit(db_id, guc->doorbell_bitmap, GUC_NUM_DOORBELLS) {
+ if (doorbell_ok(guc, db_id))
continue;
- err = __reset_doorbell(client, i);
- WARN(err, "Doorbell %d reset failed, err %d\n", i, err);
+ if (has_doorbell(client)) {
+ /* Borrow execbuf_client (we will recreate it later) */
+ destroy_doorbell(client);
+ recreate_first_client = true;
+ }
+
+ ret = __reset_doorbell(client, db_id);
+ WARN(ret, "Doorbell %u reset failed, err %d\n", db_id, ret);
}
- /* Read back & verify all doorbell registers */
- for (i = 0; i < GUC_NUM_DOORBELLS; ++i)
- WARN_ON(!doorbell_ok(guc, i));
+ if (recreate_first_client) {
+ ret = __reserve_doorbell(client);
+ if (unlikely(ret)) {
+ DRM_ERROR("Couldn't re-reserve first client db: %d\n", ret);
+ return ret;
+ }
- err = __reserve_doorbell(client);
- if (err)
- return err;
+ __update_doorbell_desc(client, client->doorbell_id);
+ }
- err = __update_doorbell_desc(client, client->doorbell_id);
- if (err)
- goto err_reserve;
+ /* Now for every client (and not only execbuf_client) make sure their
+ * doorbells are known by the GuC */
+ //for (client = client_list; client != NULL; client = client->next)
+ {
+ ret = __create_doorbell(client);
+ if (ret) {
+ DRM_ERROR("Couldn't recreate client %u doorbell: %d\n",
+ client->ctx_index, ret);
+ return ret;
+ }
+ }
- err = __create_doorbell(client);
- if (err)
- goto err_update;
+ /* Read back & verify all (used & unused) doorbell registers */
+ for (db_id = 0; db_id < GUC_NUM_DOORBELLS; ++db_id)
+ WARN_ON(!doorbell_ok(guc, db_id));
return 0;
-err_reserve:
- __unreserve_doorbell(client);
-err_update:
- __update_doorbell_desc(client, GUC_DOORBELL_INVALID);
- return err;
}
/**
@@ -923,11 +953,9 @@ static int guc_init_doorbell_hw(struct intel_guc *guc)
guc_proc_desc_init(guc, client);
guc_ctx_desc_init(guc, client);
- /* FIXME: Runtime client allocation (which currently we don't do) will
- * require that the doorbell gets created now. The static execbuf_client
- * is now getting its doorbell later (on submission enable) but maybe we
- * also want to reorder things in the future so that we don't have to
- * special case the doorbell creation */
+ ret = create_doorbell(client);
+ if (ret)
+ goto err_vaddr;
DRM_DEBUG_DRIVER("new priority %u client %p for engine(s) 0x%x: ctx_index %u\n",
priority, client, client->engines, client->ctx_index);
@@ -935,6 +963,9 @@ static int guc_init_doorbell_hw(struct intel_guc *guc)
client->doorbell_id, client->doorbell_offset);
return client;
+
+err_vaddr:
+ i915_gem_object_unpin_map(client->vma->obj);
err_vma:
i915_vma_unpin_and_release(&client->vma);
err_id:
@@ -944,6 +975,24 @@ static int guc_init_doorbell_hw(struct intel_guc *guc)
return ERR_PTR(ret);
}
+static void guc_client_free(struct i915_guc_client *client)
+{
+ /*
+ * XXX: wait for any outstanding submissions before freeing memory.
+ * Be sure to drop any locks
+ */
+
+ /* FIXME: in many cases, by the time we get here the GuC has been
+ * reset, so we cannot destroy the doorbell properly. Ignore the
+ * error message for now */
+ destroy_doorbell(client);
+ guc_ctx_desc_fini(client->guc, client);
+ i915_gem_object_unpin_map(client->vma->obj);
+ i915_vma_unpin_and_release(&client->vma);
+ ida_simple_remove(&client->guc->ctx_ids, client->ctx_index);
+ kfree(client);
+}
+
static void guc_policies_init(struct guc_policies *policies)
{
struct guc_policy *policy;
@@ -1035,8 +1084,8 @@ static void guc_ads_destroy(struct intel_guc *guc)
}
/*
- * Set up the memory resources to be shared with the GuC. At this point,
- * we require just one object that can be mapped through the GGTT.
+ * Set up the memory resources to be shared with the GuC (via the GGTT)
+ * at firmware loading time.
*/
int i915_guc_submission_init(struct drm_i915_private *dev_priv)
{
@@ -1048,16 +1097,6 @@ int i915_guc_submission_init(struct drm_i915_private *dev_priv)
void *vaddr;
int ret;
- if (!HAS_GUC_SCHED(dev_priv))
- return 0;
-
- /* Wipe bitmap & delete client in case of reinitialisation */
- bitmap_clear(guc->doorbell_bitmap, 0, GUC_NUM_DOORBELLS);
- i915_guc_submission_disable(dev_priv);
-
- if (!i915.enable_guc_submission)
- return 0;
-
if (guc->ctx_pool)
return 0;
@@ -1085,20 +1124,8 @@ int i915_guc_submission_init(struct drm_i915_private *dev_priv)
ida_init(&guc->ctx_ids);
- guc->execbuf_client = guc_client_alloc(dev_priv,
- INTEL_INFO(dev_priv)->ring_mask,
- GUC_CTX_PRIORITY_KMD_NORMAL,
- dev_priv->kernel_context);
- if (IS_ERR(guc->execbuf_client)) {
- DRM_ERROR("Failed to create GuC client for execbuf!\n");
- ret = PTR_ERR(guc->execbuf_client);
- goto err_ads;
- }
-
return 0;
-err_ads:
- guc_ads_destroy(guc);
err_log:
intel_guc_log_destroy(guc);
err_vaddr:
@@ -1112,11 +1139,6 @@ void i915_guc_submission_fini(struct drm_i915_private *dev_priv)
{
struct intel_guc *guc = &dev_priv->guc;
- if (!i915.enable_guc_submission)
- return 0;
-
- guc_client_free(guc->execbuf_client);
- guc->execbuf_client = NULL;
ida_destroy(&guc->ctx_ids);
guc_ads_destroy(guc);
intel_guc_log_destroy(guc);
@@ -1124,17 +1146,6 @@ void i915_guc_submission_fini(struct drm_i915_private *dev_priv)
i915_vma_unpin_and_release(&guc->ctx_pool);
}
-static void guc_reset_wq(struct i915_guc_client *client)
-{
- struct guc_process_desc *desc = client->vaddr +
- client->proc_desc_offset;
-
- desc->head = 0;
- desc->tail = 0;
-
- client->wq_tail = 0;
-}
-
static void guc_interrupts_capture(struct drm_i915_private *dev_priv)
{
struct intel_engine_cs *engine;
@@ -1185,17 +1196,28 @@ int i915_guc_submission_enable(struct drm_i915_private *dev_priv)
enum intel_engine_id id;
int err;
- if (!client)
- return -ENODEV;
+ if (!client) {
+ client = guc_client_alloc(dev_priv,
+ INTEL_INFO(dev_priv)->ring_mask,
+ GUC_CTX_PRIORITY_KMD_NORMAL,
+ dev_priv->kernel_context);
+ if (IS_ERR(client)) {
+ DRM_ERROR("Failed to create GuC client for execbuf!\n");
+ return PTR_ERR(client);
+ }
+
+ guc->execbuf_client = client;
+ }
err = intel_guc_sample_forcewake(guc);
if (err)
- return err;
+ goto err_execbuf_client;
guc_reset_wq(client);
+
err = guc_init_doorbell_hw(guc);
if (err)
- return err;
+ goto err_execbuf_client;
/* Take over from manual control of ELSP (execlists) */
guc_interrupts_capture(dev_priv);
@@ -1222,6 +1244,11 @@ int i915_guc_submission_enable(struct drm_i915_private *dev_priv)
}
return 0;
+
+err_execbuf_client:
+ guc_client_free(guc->execbuf_client);
+ guc->execbuf_client = NULL;
+ return err;
}
static void guc_interrupts_release(struct drm_i915_private *dev_priv)
@@ -1254,16 +1281,11 @@ void i915_guc_submission_disable(struct drm_i915_private *dev_priv)
guc_interrupts_release(dev_priv);
- if (!guc->execbuf_client)
- return;
-
- /* FIXME: in many cases, by the time we get here the GuC has been
- * reset, so we cannot destroy the doorbell properly. Ignore the
- * error message for now */
- destroy_doorbell(guc->execbuf_client);
-
/* Revert back to manual ELSP submission */
intel_engines_reset_default_submission(dev_priv);
+
+ guc_client_free(guc->execbuf_client);
+ guc->execbuf_client = NULL;
}
/**
@@ -1292,7 +1314,6 @@ int intel_guc_suspend(struct drm_i915_private *dev_priv)
return intel_guc_send(guc, data, ARRAY_SIZE(data));
}
-
/**
* intel_guc_resume() - notify GuC resuming from suspend state
* @dev_priv: i915 device private
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index ea99c89..db52594 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -126,13 +126,15 @@ int intel_uc_init_hw(struct drm_i915_private *dev_priv)
/* We need to notify the guc whenever we change the GGTT */
i915_ggtt_enable_guc(dev_priv);
- /*
- * This is stuff we need to have available at fw load time
- * if we are planning to enable submission later
- */
- ret = i915_guc_submission_init(dev_priv);
- if (ret)
- goto err_guc;
+ if (i915.enable_guc_submission) {
+ /*
+ * This is stuff we need to have available at fw load time
+ * if we are planning to enable submission later
+ */
+ ret = i915_guc_submission_init(dev_priv);
+ if (ret)
+ goto err_guc;
+ }
/* WaEnableuKernelHeaderValidFix:skl */
/* WaEnableGuCBootHashCheckNotSet:skl,bxt,kbl */
@@ -187,7 +189,8 @@ int intel_uc_init_hw(struct drm_i915_private *dev_priv)
err_interrupts:
gen9_disable_guc_interrupts(dev_priv);
err_submission:
- i915_guc_submission_fini(dev_priv);
+ if (i915.enable_guc_submission)
+ i915_guc_submission_fini(dev_priv);
err_guc:
i915_ggtt_disable_guc(dev_priv);
@@ -210,8 +213,8 @@ void intel_uc_fini_hw(struct drm_i915_private *dev_priv)
if (i915.enable_guc_submission) {
i915_guc_submission_disable(dev_priv);
gen9_disable_guc_interrupts(dev_priv);
+ i915_guc_submission_fini(dev_priv);
}
- i915_guc_submission_fini(dev_priv);
i915_ggtt_disable_guc(dev_priv);
}
--
1.9.1
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