On 10/03/17 08:28, Oscar Mateo wrote:
Started adding proper teardown to guc_client_alloc, ended up removing
quite a few dead ends where errors communicating with the GuC were
silently ignored. There also seemed to be quite a few erronous
teardown actions performed in case of an error (ordering wrong).
v2:
- Increase function symmetry/proximity (Michal/Daniele)
- Fix __reserve_doorbell accounting for high priority (Daniele)
- Call __update_doorbell_desc! (Daniele)
- Isolate __guc_{,de}allocate_doorbell (Michal/Daniele)
v3:
- "Select" a cacheline is a more accurate verb than "reserve" (Daniele).
- We cannot update & create the doorbell without reserving it first, so
move the whole doorbell creation for execbuf_client to the submission
enable (Oscar).i
- Add a fixme for ignoring possible doorbell destroy errors.
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
Cc: Arkadiusz Hiler <arkadiusz.hiler@xxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Signed-off-by: Oscar Mateo <oscar.mateo@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 4 +-
drivers/gpu/drm/i915/i915_guc_submission.c | 391 ++++++++++++++++-------------
drivers/gpu/drm/i915/intel_guc_fwif.h | 4 +-
drivers/gpu/drm/i915/intel_uc.h | 11 +-
4 files changed, 229 insertions(+), 181 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 56674df..c395ccf 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2469,7 +2469,7 @@ static void i915_guc_client_info(struct seq_file *m,
seq_printf(m, "\tPriority %d, GuC ctx index: %u, PD offset 0x%x\n",
client->priority, client->ctx_index, client->proc_desc_offset);
- seq_printf(m, "\tDoorbell id %d, offset: 0x%x, cookie 0x%x\n",
+ seq_printf(m, "\tDoorbell id %d, offset: 0x%lx, cookie 0x%x\n",
client->doorbell_id, client->doorbell_offset, client->doorbell_cookie);
seq_printf(m, "\tWQ size %d, offset: 0x%x, tail %d\n",
client->wq_size, client->wq_offset, client->wq_tail);
@@ -2504,7 +2504,7 @@ static int i915_guc_info(struct seq_file *m, void *data)
}
seq_printf(m, "Doorbell map:\n");
- seq_printf(m, "\t%*pb\n", GUC_MAX_DOORBELLS, guc->doorbell_bitmap);
+ seq_printf(m, "\t%*pb\n", GUC_NUM_DOORBELLS, guc->doorbell_bitmap);
seq_printf(m, "Doorbell next cacheline: 0x%x\n\n", guc->db_cacheline);
seq_printf(m, "GuC total action count: %llu\n", guc->action_count);
diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index 41f2dd8..ceeb1fa 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -62,27 +62,73 @@
*
*/
+static inline bool is_high_priority(struct i915_guc_client* client)
+{
+ return client->priority <= GUC_CTX_PRIORITY_HIGH;
+}
+
+static int __reserve_doorbell(struct i915_guc_client *client)
+{
+ unsigned long offset;
+ unsigned long end;
+ u16 id;
+
+ GEM_BUG_ON(client->doorbell_id != GUC_DOORBELL_INVALID);
+
+ /*
+ * The bitmap tracks which doorbell registers are currently in use.
+ * It is split into two halves; the first half is used for normal
+ * priority contexts, the second half for high-priority ones.
+ * Note that logically higher priorities are numerically less than
+ * normal ones, so the test below means "is it high-priority?"
The comment about the test doesn't apply anymore so we can either remove
it or move it in the is_high_priority() function.
+ */
+
+ offset = 0;
+ end = GUC_NUM_DOORBELLS/2;
+ if (is_high_priority(client)) {
+ offset = end;
+ end += offset;
+ }
+
+ id = find_next_zero_bit(client->guc->doorbell_bitmap, offset, end);
+ if (id == end)
+ return -ENOSPC;
+
+ __set_bit(id, client->guc->doorbell_bitmap);
+ client->doorbell_id = id;
+ DRM_DEBUG_DRIVER("client %u (high prio=%s) reserved doorbell %d: \n",
"%d:" -> ": %d" ?
+ client->ctx_index, yesno(is_high_priority(client)),
+ id);
+ return 0;
+}
+
+static void __unreserve_doorbell(struct i915_guc_client *client)
+{
+ GEM_BUG_ON(client->doorbell_id == GUC_DOORBELL_INVALID);
+
+ __clear_bit(client->doorbell_id, client->guc->doorbell_bitmap);
+ client->doorbell_id = GUC_DOORBELL_INVALID;
+}
+
/*
* Tell the GuC to allocate or deallocate a specific doorbell
*/
-static int guc_allocate_doorbell(struct intel_guc *guc,
- struct i915_guc_client *client)
+static int __guc_allocate_doorbell(struct intel_guc *guc, u32 ctx_index)
{
u32 action[] = {
INTEL_GUC_ACTION_ALLOCATE_DOORBELL,
- client->ctx_index
+ ctx_index
};
return intel_guc_send(guc, action, ARRAY_SIZE(action));
}
-static int guc_release_doorbell(struct intel_guc *guc,
- struct i915_guc_client *client)
+static int __guc_deallocate_doorbell(struct intel_guc *guc, u32 ctx_index)
{
u32 action[] = {
INTEL_GUC_ACTION_DEALLOCATE_DOORBELL,
- client->ctx_index
+ ctx_index
};
return intel_guc_send(guc, action, ARRAY_SIZE(action));
@@ -95,104 +141,100 @@ static int guc_release_doorbell(struct intel_guc *guc,
* client object which contains the page being used for the doorbell
*/
-static int guc_update_doorbell_id(struct intel_guc *guc,
- struct i915_guc_client *client,
- u16 new_id)
+static int __update_doorbell_desc(struct i915_guc_client *client, u16 new_id)
{
- struct sg_table *sg = guc->ctx_pool_vma->pages;
- void *doorbell_bitmap = guc->doorbell_bitmap;
- struct guc_doorbell_info *doorbell;
+ struct sg_table *sg = client->guc->ctx_pool_vma->pages;
struct guc_context_desc desc;
size_t len;
- doorbell = client->vaddr + client->doorbell_offset;
-
- if (client->doorbell_id != GUC_INVALID_DOORBELL_ID &&
- test_bit(client->doorbell_id, doorbell_bitmap)) {
- /* Deactivate the old doorbell */
- doorbell->db_status = GUC_DOORBELL_DISABLED;
- (void)guc_release_doorbell(guc, client);
- __clear_bit(client->doorbell_id, doorbell_bitmap);
- }
-
/* Update the GuC's idea of the doorbell ID */
len = sg_pcopy_to_buffer(sg->sgl, sg->nents, &desc, sizeof(desc),
- sizeof(desc) * client->ctx_index);
+ sizeof(desc) * client->ctx_index);
if (len != sizeof(desc))
return -EFAULT;
+
desc.db_id = new_id;
len = sg_pcopy_from_buffer(sg->sgl, sg->nents, &desc, sizeof(desc),
- sizeof(desc) * client->ctx_index);
+ sizeof(desc) * client->ctx_index);
if (len != sizeof(desc))
return -EFAULT;
- client->doorbell_id = new_id;
- if (new_id == GUC_INVALID_DOORBELL_ID)
- return 0;
+ return 0;
+}
- /* Activate the new doorbell */
- __set_bit(new_id, doorbell_bitmap);
+static struct guc_doorbell_info *__get_doorbell(struct i915_guc_client *client)
from what I can see this could also be used from guc_ring_doorbell and
possibly from guc_ctx_desc_init
+{
+ return client->vaddr + client->doorbell_offset;
Not introduced by this patch, but arithmetic on void pointers doesn't
really look clean IMO. Can we cast the pointer to uintptr_t or char* or
whatever else is appropriate before incrementing it? I'm happy for it to
be done in a follow up.
+}
+
+static bool has_doorbell(struct i915_guc_client *client)
+{
+ if (client->doorbell_id == GUC_DOORBELL_INVALID)
+ return false;
+
+ return test_bit(client->doorbell_id, client->guc->doorbell_bitmap);
+}
+
+static int __create_doorbell(struct i915_guc_client *client)
+{
+ struct guc_doorbell_info *doorbell;
+ int err;
+
+ doorbell = __get_doorbell(client);
doorbell->db_status = GUC_DOORBELL_ENABLED;
doorbell->cookie = client->doorbell_cookie;
- return guc_allocate_doorbell(guc, client);
+
+ err = __guc_allocate_doorbell(client->guc, client->ctx_index);
+ if (err) {
+ doorbell->db_status = GUC_DOORBELL_DISABLED;
+ doorbell->cookie = 0;
+ }
+ return err;
}
-static void guc_disable_doorbell(struct intel_guc *guc,
- struct i915_guc_client *client)
+static int __destroy_doorbell(struct i915_guc_client *client)
{
- (void)guc_update_doorbell_id(guc, client, GUC_INVALID_DOORBELL_ID);
+ struct guc_doorbell_info *doorbell;
- /* XXX: wait for any interrupts */
- /* XXX: wait for workqueue to drain */
+ doorbell = __get_doorbell(client);
+ doorbell->db_status = GUC_DOORBELL_DISABLED;
+ doorbell->cookie = 0;
+
+ return __guc_deallocate_doorbell(client->guc, client->ctx_index);
}
-static uint16_t
-select_doorbell_register(struct intel_guc *guc, uint32_t priority)
+static int destroy_doorbell(struct i915_guc_client *client)
{
- /*
- * The bitmap tracks which doorbell registers are currently in use.
- * It is split into two halves; the first half is used for normal
- * priority contexts, the second half for high-priority ones.
- * Note that logically higher priorities are numerically less than
- * normal ones, so the test below means "is it high-priority?"
- */
- const bool hi_pri = (priority <= GUC_CTX_PRIORITY_HIGH);
- const uint16_t half = GUC_MAX_DOORBELLS / 2;
- const uint16_t start = hi_pri ? half : 0;
- const uint16_t end = start + half;
- uint16_t id;
+ int err;
- id = find_next_zero_bit(guc->doorbell_bitmap, end, start);
- if (id == end)
- id = GUC_INVALID_DOORBELL_ID;
+ GEM_BUG_ON(!has_doorbell(client));
- DRM_DEBUG_DRIVER("assigned %s priority doorbell id 0x%x\n",
- hi_pri ? "high" : "normal", id);
+ /* XXX: wait for any interrupts */
+ /* XXX: wait for workqueue to drain */
- return id;
-}
+ err = __destroy_doorbell(client);
+ if (err)
+ return err;
-/*
- * Select, assign and relase doorbell cachelines
- *
- * These functions track which doorbell cachelines are in use.
- * The data they manipulate is protected by the intel_guc_send lock.
- */
+ __update_doorbell_desc(client, GUC_DOORBELL_INVALID);
+
+ __unreserve_doorbell(client);
-static uint32_t select_doorbell_cacheline(struct intel_guc *guc)
+ return 0;
+}
+
+static unsigned long __select_cacheline(struct intel_guc* guc)
{
- const uint32_t cacheline_size = cache_line_size();
- uint32_t offset;
+ unsigned long offset;
/* Doorbell uses a single cache line within a page */
offset = offset_in_page(guc->db_cacheline);
/* Moving to next cache line to reduce contention */
- guc->db_cacheline += cacheline_size;
-
- DRM_DEBUG_DRIVER("selected doorbell cacheline 0x%x, next 0x%x, linesize %u\n",
- offset, guc->db_cacheline, cacheline_size);
+ guc->db_cacheline += cache_line_size();
+ DRM_DEBUG_DRIVER("reserved cacheline 0x%lx, next 0x%x, linesize %u\n",
+ offset, guc->db_cacheline, cache_line_size());
return offset;
}
@@ -594,93 +636,96 @@ struct i915_vma *intel_guc_allocate_vma(struct intel_guc *guc, u32 size)
return vma;
}
-static void
-guc_client_free(struct drm_i915_private *dev_priv,
- struct i915_guc_client *client)
+static void guc_client_free(struct i915_guc_client *client)
{
- struct intel_guc *guc = &dev_priv->guc;
-
- if (!client)
- return;
-
/*
* XXX: wait for any outstanding submissions before freeing memory.
* Be sure to drop any locks
*/
-
- if (client->vaddr) {
- /*
- * If we got as far as setting up a doorbell, make sure we
- * shut it down before unmapping & deallocating the memory.
- */
- guc_disable_doorbell(guc, client);
-
- i915_gem_object_unpin_map(client->vma->obj);
- }
-
+ guc_ctx_desc_fini(client->guc, client);
+ i915_gem_object_unpin_map(client->vma->obj);
i915_vma_unpin_and_release(&client->vma);
-
- if (client->ctx_index != GUC_INVALID_CTX_ID) {
- guc_ctx_desc_fini(guc, client);
- ida_simple_remove(&guc->ctx_ids, client->ctx_index);
- }
-
+ ida_simple_remove(&client->guc->ctx_ids, client->ctx_index);
kfree(client);
}
/* Check that a doorbell register is in the expected state */
-static bool guc_doorbell_check(struct intel_guc *guc, uint16_t db_id)
+static bool doorbell_ok(struct intel_guc *guc, u16 db_id)
{
struct drm_i915_private *dev_priv = guc_to_i915(guc);
- i915_reg_t drbreg = GEN8_DRBREGL(db_id);
- uint32_t value = I915_READ(drbreg);
- bool enabled = (value & GUC_DOORBELL_ENABLED) != 0;
- bool expected = test_bit(db_id, guc->doorbell_bitmap);
+ u32 drbregl;
+ bool valid;
- if (enabled == expected)
+ GEM_BUG_ON(db_id >= GUC_DOORBELL_INVALID);
+
+ drbregl = I915_READ(GEN8_DRBREGL(db_id));
+ valid = drbregl & GEN8_DRB_VALID;
+
+ if (test_bit(db_id, guc->doorbell_bitmap) == valid)
return true;
- DRM_DEBUG_DRIVER("Doorbell %d (reg 0x%x) 0x%x, should be %s\n",
- db_id, drbreg.reg, value,
- expected ? "active" : "inactive");
+ DRM_DEBUG_DRIVER("Doorbell %d has unexpected state (0x%x): valid=%s\n",
+ db_id, drbregl, yesno(valid));
return false;
}
+static int __reset_doorbell(struct i915_guc_client* client, u16 db_id)
This reset only works if the GuC FW thinks that the doorbell is
unassigned, otherwise the ALLOCATE_DOORBELL action will fail. We
currently only use it to reset the doorbell HW status after resetting
GuC and reloading the FW so it is ok, but we could use a comment to
explain the limitation of this reset.
The patch looks functionally ok, so with the minor comments addressed:
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
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