[Intel-gfx] [RFC/CI] drm/i915: Sanitize GuC client initialization
Joonas Lahtinen
joonas.lahtinen at linux.intel.com
Fri Feb 10 13:30:10 UTC 2017
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).
Signed-off-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Arkadiusz Hiler <arkadiusz.hiler at intel.com>
Cc: Oscar Mateo <oscar.mateo at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_debugfs.c | 4 +-
drivers/gpu/drm/i915/i915_guc_submission.c | 384 +++++++++++++++++------------
drivers/gpu/drm/i915/intel_guc_fwif.h | 4 +-
drivers/gpu/drm/i915/intel_uc.h | 9 +-
4 files changed, 230 insertions(+), 171 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 1ccc297..86c6f831 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2480,7 +2480,7 @@ 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);
@@ -2515,7 +2515,7 @@ 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 8ced9e2..d0c7004 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -62,30 +62,79 @@
*
*/
+static inline bool is_high_priority(struct i915_guc_client* client)
+{
+ return client->priority <= GUC_CTX_PRIORITY_HIGH;
+}
+
+static bool __test_doorbell(struct i915_guc_client *client)
+{
+ return test_bit(client->doorbell_id, client->guc->doorbell_bitmap);
+}
+
+static void __release_doorbell(struct i915_guc_client *client)
+{
+ GEM_BUG_ON(client->doorbell_id == GUC_DOORBELL_INVALID);
+
+ __clear_bit(client->doorbell_id, client->guc->doorbell_bitmap);
+}
+
+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?"
+ */
+
+ offset = 0;
+ if (is_high_priority(client))
+ offset = GUC_NUM_DOORBELLS/2;
+
+ end = GUC_NUM_DOORBELLS - 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",
+ client->ctx_index, yesno(is_high_priority(client)),
+ id);
+ return 0;
+}
+
/*
* 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 __create_doorbell_hw(struct i915_guc_client *client)
{
u32 action[] = {
INTEL_GUC_ACTION_ALLOCATE_DOORBELL,
client->ctx_index
};
- return intel_guc_send(guc, action, ARRAY_SIZE(action));
+ return intel_guc_send(client->guc, action, ARRAY_SIZE(action));
}
-static int guc_release_doorbell(struct intel_guc *guc,
- struct i915_guc_client *client)
+static int __destroy_doorbell_hw(struct i915_guc_client *client)
{
u32 action[] = {
INTEL_GUC_ACTION_DEALLOCATE_DOORBELL,
client->ctx_index
};
- return intel_guc_send(guc, action, ARRAY_SIZE(action));
+ return intel_guc_send(client->guc, action, ARRAY_SIZE(action));
}
/*
@@ -95,104 +144,114 @@ 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(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;
+}
+
+static bool has_doorbell(struct i915_guc_client *client)
+{
+ if (client->doorbell_id == GUC_DOORBELL_INVALID)
+ return false;
+
+ return __test_doorbell(client);
+}
- /* Activate the new doorbell */
- __set_bit(new_id, doorbell_bitmap);
+static struct guc_doorbell_info *__get_doorbell(struct i915_guc_client *client)
+{
+ return client->vaddr + client->doorbell_offset;
+}
+
+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 = __create_doorbell_hw(client);
+ if (err) {
+ doorbell->db_status = GUC_DOORBELL_DISABLED;
+ doorbell->cookie = 0;
+ __release_doorbell(client);
+ }
+ return err;
}
-static void guc_disable_doorbell(struct intel_guc *guc,
- struct i915_guc_client *client)
+/*
+static int create_doorbell(struct i915_guc_client *client)
{
- (void)guc_update_doorbell_id(guc, client, GUC_INVALID_DOORBELL_ID);
+ int err;
- /* XXX: wait for any interrupts */
- /* XXX: wait for workqueue to drain */
+ GEM_BUG_ON(has_doorbell(client));
+
+ err = __reserve_doorbell(client);
+ if (err)
+ return err;
+
+ return __create_doorbell(client);
}
+*/
-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;
-
- id = find_next_zero_bit(guc->doorbell_bitmap, end, start);
- if (id == end)
- id = GUC_INVALID_DOORBELL_ID;
+ struct guc_doorbell_info *doorbell;
- DRM_DEBUG_DRIVER("assigned %s priority doorbell id 0x%x\n",
- hi_pri ? "high" : "normal", id);
+ doorbell = __get_doorbell(client);
+ doorbell->db_status = GUC_DOORBELL_DISABLED;
+ doorbell->cookie = 0;
- return id;
+ return __destroy_doorbell_hw(client);
}
-/*
- * 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.
- */
+static int destroy_doorbell(struct i915_guc_client *client)
+{
+ int err;
+
+ GEM_BUG_ON(!has_doorbell(client));
-static uint32_t select_doorbell_cacheline(struct intel_guc *guc)
+ /* XXX: wait for any interrupts */
+ /* XXX: wait for workqueue to drain */
+
+ err = __destroy_doorbell(client);
+ if (err)
+ return err;
+
+ __release_doorbell(client);
+
+ return 0;
+}
+
+static unsigned long __reserve_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;
}
@@ -584,93 +643,81 @@ 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);
- }
-
+ WARN_ON(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);
-
- 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, u8 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);
- if (enabled == expected)
+ u32 drbregl = I915_READ(GEN8_DRBREGL(db_id));
+
+ bool 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)
+{
+ int err;
+
+ err = __update_doorbell(client, db_id);
+ if (!err)
+ err = __create_doorbell(client);
+ if (!err)
+ err = __destroy_doorbell(client);
+
+ return err;
+}
+
/*
* Borrow the first client to set up & tear down each unused doorbell
* in turn, to ensure that all doorbell h/w is (re)initialised.
*/
-static void guc_init_doorbell_hw(struct intel_guc *guc)
+static int guc_init_doorbell_hw(struct intel_guc *guc)
{
struct i915_guc_client *client = guc->execbuf_client;
- uint16_t db_id;
- int i, err;
+ int err;
+ int i;
- guc_disable_doorbell(guc, client);
+ if (has_doorbell(client))
+ destroy_doorbell(client);
- for (i = 0; i < GUC_MAX_DOORBELLS; ++i) {
- /* Skip if doorbell is OK */
- if (guc_doorbell_check(guc, i))
+ for (i = 0; i < GUC_NUM_DOORBELLS; ++i) {
+ if (doorbell_ok(guc, i))
continue;
- err = guc_update_doorbell_id(guc, client, i);
- if (err)
- DRM_DEBUG_DRIVER("Doorbell %d update failed, err %d\n",
- i, err);
+ err = __reset_doorbell(client, i);
+ WARN(err, "Doorbell %d reset failed, err %d\n", i, err);
}
- db_id = select_doorbell_register(guc, client->priority);
- WARN_ON(db_id == GUC_INVALID_DOORBELL_ID);
-
- err = guc_update_doorbell_id(guc, client, db_id);
+ err = __reserve_doorbell(client);
if (err)
- DRM_WARN("Failed to restore doorbell to %d, err %d\n",
- db_id, err);
+ return err;
/* Read back & verify all doorbell registers */
- for (i = 0; i < GUC_MAX_DOORBELLS; ++i)
- (void)guc_doorbell_check(guc, i);
+ for (i = 0; i < GUC_NUM_DOORBELLS; ++i)
+ WARN_ON(!doorbell_ok(guc, i));
+
+ return 0;
}
/**
@@ -696,49 +743,52 @@ guc_client_alloc(struct drm_i915_private *dev_priv,
struct intel_guc *guc = &dev_priv->guc;
struct i915_vma *vma;
void *vaddr;
- uint16_t db_id;
+ int ret;
client = kzalloc(sizeof(*client), GFP_KERNEL);
if (!client)
- return NULL;
+ return ERR_PTR(-ENOMEM);
- client->owner = ctx;
client->guc = guc;
+ client->owner = ctx;
client->engines = engines;
client->priority = priority;
- client->doorbell_id = GUC_INVALID_DOORBELL_ID;
+ client->doorbell_id = GUC_DOORBELL_INVALID;
+ client->wq_offset = GUC_DB_SIZE;
+ client->wq_size = GUC_WQ_SIZE;
+ spin_lock_init(&client->wq_lock);
- client->ctx_index = (uint32_t)ida_simple_get(&guc->ctx_ids, 0,
- GUC_MAX_GPU_CONTEXTS, GFP_KERNEL);
- if (client->ctx_index >= GUC_MAX_GPU_CONTEXTS) {
- client->ctx_index = GUC_INVALID_CTX_ID;
- goto err;
- }
+ ret = ida_simple_get(&guc->ctx_ids, 0, GUC_MAX_GPU_CONTEXTS,
+ GFP_KERNEL);
+ if (ret < 0)
+ goto err_client;
+
+ client->ctx_index = ret;
/* The first page is doorbell/proc_desc. Two followed pages are wq. */
vma = intel_guc_allocate_vma(guc, GUC_DB_SIZE + GUC_WQ_SIZE);
- if (IS_ERR(vma))
- goto err;
+ if (IS_ERR(vma)) {
+ ret = PTR_ERR(vma);
+ goto err_id;
+ }
/* We'll keep just the first (doorbell/proc) page permanently kmap'd. */
client->vma = vma;
vaddr = i915_gem_object_pin_map(vma->obj, I915_MAP_WB);
- if (IS_ERR(vaddr))
- goto err;
+ if (IS_ERR(vaddr)) {
+ ret = PTR_ERR(vaddr);
+ goto err_vma;
+ }
client->vaddr = vaddr;
- spin_lock_init(&client->wq_lock);
- client->wq_offset = GUC_DB_SIZE;
- client->wq_size = GUC_WQ_SIZE;
-
- db_id = select_doorbell_register(guc, client->priority);
- if (db_id == GUC_INVALID_DOORBELL_ID)
+ ret = __reserve_doorbell(client);
+ if (ret)
/* XXX: evict a doorbell instead? */
- goto err;
+ goto err_vaddr;
- client->doorbell_offset = select_doorbell_cacheline(guc);
+ client->doorbell_offset = __reserve_cacheline(guc);
/*
* Since the doorbell only requires a single cacheline, we can save
@@ -753,26 +803,31 @@ guc_client_alloc(struct drm_i915_private *dev_priv,
guc_proc_desc_init(guc, client);
guc_ctx_desc_init(guc, client);
- /* For runtime client allocation we need to enable the doorbell. Not
- * required yet for the static execbuf_client as this special kernel
- * client is enabled from i915_guc_submission_enable().
- *
- * guc_update_doorbell_id(guc, client, db_id);
- */
+ /* For runtime client allocation we need to enable the doorbell. */
+ ret = __create_doorbell(client);
+ if (ret)
+ goto err_db;
DRM_DEBUG_DRIVER("new priority %u client %p for engine(s) 0x%x: ctx_index %u\n",
- priority, client, client->engines, client->ctx_index);
- DRM_DEBUG_DRIVER("doorbell id %u, cacheline offset 0x%x\n",
- client->doorbell_id, client->doorbell_offset);
+ priority, client, client->engines, client->ctx_index);
+ DRM_DEBUG_DRIVER("doorbell id %u, cacheline offset 0x%lx\n",
+ client->doorbell_id, client->doorbell_offset);
return client;
-err:
- guc_client_free(dev_priv, client);
- return NULL;
-}
-
+err_db:
+ __release_doorbell(client);
+err_vaddr:
+ i915_gem_object_unpin_map(client->vma->obj);
+err_vma:
+ i915_vma_unpin_and_release(&client->vma);
+err_id:
+ ida_simple_remove(&guc->ctx_ids, client->ctx_index);
+err_client:
+ kfree(client);
+ return ERR_PTR(ret);
+}
static void guc_policies_init(struct guc_policies *policies)
{
@@ -881,7 +936,7 @@ int i915_guc_submission_init(struct drm_i915_private *dev_priv)
return 0;
/* Wipe bitmap & delete client in case of reinitialisation */
- bitmap_clear(guc->doorbell_bitmap, 0, GUC_MAX_DOORBELLS);
+ bitmap_clear(guc->doorbell_bitmap, 0, GUC_NUM_DOORBELLS);
i915_guc_submission_disable(dev_priv);
if (!i915.enable_guc_submission)
@@ -932,14 +987,19 @@ int i915_guc_submission_enable(struct drm_i915_private *dev_priv)
struct i915_guc_client *client = guc->execbuf_client;
struct intel_engine_cs *engine;
enum intel_engine_id id;
+ int err;
if (!client)
return -ENODEV;
- intel_guc_sample_forcewake(guc);
+ err = intel_guc_sample_forcewake(guc);
+ if (err)
+ return err;
guc_reset_wq(client);
- guc_init_doorbell_hw(guc);
+ err = guc_init_doorbell_hw(guc);
+ if (err)
+ return err;
/* Take over from manual control of ELSP (execlists) */
for_each_engine(engine, dev_priv, id) {
@@ -978,7 +1038,7 @@ void i915_guc_submission_fini(struct drm_i915_private *dev_priv)
if (!client)
return;
- guc_client_free(dev_priv, client);
+ guc_client_free(client);
i915_vma_unpin_and_release(&guc->ads_vma);
i915_vma_unpin_and_release(&guc->log.vma);
diff --git a/drivers/gpu/drm/i915/intel_guc_fwif.h b/drivers/gpu/drm/i915/intel_guc_fwif.h
index 25691f0..3ae8cef 100644
--- a/drivers/gpu/drm/i915/intel_guc_fwif.h
+++ b/drivers/gpu/drm/i915/intel_guc_fwif.h
@@ -241,8 +241,8 @@ union guc_doorbell_qw {
u64 value_qw;
} __packed;
-#define GUC_MAX_DOORBELLS 256
-#define GUC_INVALID_DOORBELL_ID (GUC_MAX_DOORBELLS)
+#define GUC_NUM_DOORBELLS 256
+#define GUC_DOORBELL_INVALID (GUC_NUM_DOORBELLS)
#define GUC_DB_SIZE (PAGE_SIZE)
#define GUC_WQ_SIZE (PAGE_SIZE * 2)
diff --git a/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
index d74f4d3..3cbf853 100644
--- a/drivers/gpu/drm/i915/intel_uc.h
+++ b/drivers/gpu/drm/i915/intel_uc.h
@@ -75,10 +75,9 @@ struct i915_guc_client {
uint32_t ctx_index;
uint32_t proc_desc_offset;
- uint32_t doorbell_offset;
- uint32_t doorbell_cookie;
- uint16_t doorbell_id;
- uint16_t padding[3]; /* Maintain alignment */
+ u16 doorbell_id;
+ unsigned long doorbell_offset;
+ u32 doorbell_cookie;
spinlock_t wq_lock;
uint32_t wq_offset;
@@ -159,7 +158,7 @@ struct intel_guc {
struct i915_guc_client *execbuf_client;
- DECLARE_BITMAP(doorbell_bitmap, GUC_MAX_DOORBELLS);
+ DECLARE_BITMAP(doorbell_bitmap, GUC_NUM_DOORBELLS);
uint32_t db_cacheline; /* Cyclic counter mod pagesize */
/* Action status & statistics */
--
2.7.4
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