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drm/i915/guc: general tidying up (submission) 

Renaming to more consistent scheme, and updating comments, mostly
about i915_guc_wq_reserve(), aka i915_guc_wq_check_space().

Signed-off-by: Dave Gordon <david.s.gordon@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1473711577-11454-4-git-send-email-david.s.gordon@intel.com
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
hifive-unleashed-5.1
Dave Gordon 2016-09-12 21:19:37 +01:00 committed by Chris Wilson
parent 0c5664e417
commit 7a9347f947
3 changed files with 34 additions and 33 deletions
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63
drivers/gpu/drm/i915/i915_guc_submission.c
View File

@ -59,7 +59,7 @@
* WQ_TYPE_INORDER is needed to support legacy submission via GuC, which
* represents in-order queue. The kernel driver packs ring tail pointer and an
* ELSP context descriptor dword into Work Item.
* See guc_add_workqueue_item()
* See guc_wq_item_append()
*
*/
@ -288,7 +288,7 @@ static uint32_t select_doorbell_cacheline(struct intel_guc *guc)
/*
* Initialise the process descriptor shared with the GuC firmware.
*/
static void guc_init_proc_desc(struct intel_guc *guc,
static void guc_proc_desc_init(struct intel_guc *guc,
struct i915_guc_client *client)
{
struct guc_process_desc *desc;
@ -320,7 +320,7 @@ static void guc_init_proc_desc(struct intel_guc *guc,
* write queue, etc).
*/
static void guc_init_ctx_desc(struct intel_guc *guc,
static void guc_ctx_desc_init(struct intel_guc *guc,
struct i915_guc_client *client)
{
struct drm_i915_private *dev_priv = guc_to_i915(guc);
@ -399,7 +399,7 @@ static void guc_init_ctx_desc(struct intel_guc *guc,
sizeof(desc) * client->ctx_index);
}
static void guc_fini_ctx_desc(struct intel_guc *guc,
static void guc_ctx_desc_fini(struct intel_guc *guc,
struct i915_guc_client *client)
{
struct guc_context_desc desc;
@ -413,7 +413,7 @@ static void guc_fini_ctx_desc(struct intel_guc *guc,
}
/**
* i915_guc_wq_check_space() - check that the GuC can accept a request
* i915_guc_wq_reserve() - reserve space in the GuC's workqueue
* @request: request associated with the commands
*
* Return: 0 if space is available
@ -421,14 +421,14 @@ static void guc_fini_ctx_desc(struct intel_guc *guc,
*
* This function must be called (and must return 0) before a request
* is submitted to the GuC via i915_guc_submit() below. Once a result
* of 0 has been returned, it remains valid until (but only until)
* the next call to submit().
* of 0 has been returned, it must be balanced by a corresponding
* call to submit().
*
* This precheck allows the caller to determine in advance that space
* Reservation allows the caller to determine in advance that space
* will be available for the next submission before committing resources
* to it, and helps avoid late failures with complicated recovery paths.
*/
int i915_guc_wq_check_space(struct drm_i915_gem_request *request)
int i915_guc_wq_reserve(struct drm_i915_gem_request *request)
{
const size_t wqi_size = sizeof(struct guc_wq_item);
struct i915_guc_client *gc = request->i915->guc.execbuf_client;
@ -451,8 +451,9 @@ int i915_guc_wq_check_space(struct drm_i915_gem_request *request)
return ret;
}
static void guc_add_workqueue_item(struct i915_guc_client *gc,
struct drm_i915_gem_request *rq)
/* Construct a Work Item and append it to the GuC's Work Queue */
static void guc_wq_item_append(struct i915_guc_client *gc,
struct drm_i915_gem_request *rq)
{
/* wqi_len is in DWords, and does not include the one-word header */
const size_t wqi_size = sizeof(struct guc_wq_item);
@ -465,7 +466,7 @@ static void guc_add_workqueue_item(struct i915_guc_client *gc,
desc = gc->client_base + gc->proc_desc_offset;
/* Free space is guaranteed, see i915_guc_wq_check_space() above */
/* Free space is guaranteed, see i915_guc_wq_reserve() above */
freespace = CIRC_SPACE(gc->wq_tail, desc->head, gc->wq_size);
GEM_BUG_ON(freespace < wqi_size);
@ -575,14 +576,13 @@ static int guc_ring_doorbell(struct i915_guc_client *gc)
* Return: 0 on success, otherwise an errno.
* (Note: nonzero really shouldn't happen!)
*
* The caller must have already called i915_guc_wq_check_space() above
* with a result of 0 (success) since the last request submission. This
* guarantees that there is space in the work queue for the new request,
* so enqueuing the item cannot fail.
* The caller must have already called i915_guc_wq_reserve() above with
* a result of 0 (success), guaranteeing that there is space in the work
* queue for the new request, so enqueuing the item cannot fail.
*
* Bad Things Will Happen if the caller violates this protocol e.g. calls
* submit() when check() says there's no space, or calls submit() multiple
* times with no intervening check().
* submit() when _reserve() says there's no space, or calls _submit()
* a different number of times from (successful) calls to _reserve().
*
* The only error here arises if the doorbell hardware isn't functioning
* as expected, which really shouln't happen.
@ -595,7 +595,7 @@ static void i915_guc_submit(struct drm_i915_gem_request *rq)
int b_ret;
spin_lock(&client->wq_lock);
guc_add_workqueue_item(client, rq);
guc_wq_item_append(client, rq);
b_ret = guc_ring_doorbell(client);
client->submissions[engine_id] += 1;
@ -686,7 +686,7 @@ guc_client_free(struct drm_i915_private *dev_priv,
i915_vma_unpin_and_release(&client->vma);
if (client->ctx_index != GUC_INVALID_CTX_ID) {
guc_fini_ctx_desc(guc, client);
guc_ctx_desc_fini(guc, client);
ida_simple_remove(&guc->ctx_ids, client->ctx_index);
}
@ -818,8 +818,8 @@ guc_client_alloc(struct drm_i915_private *dev_priv,
else
client->proc_desc_offset = (GUC_DB_SIZE / 2);
guc_init_proc_desc(guc, client);
guc_init_ctx_desc(guc, client);
guc_proc_desc_init(guc, client);
guc_ctx_desc_init(guc, client);
if (guc_init_doorbell(guc, client, db_id))
goto err;
@ -835,7 +835,7 @@ err:
return NULL;
}
static void guc_create_log(struct intel_guc *guc)
static void guc_log_create(struct intel_guc *guc)
{
struct i915_vma *vma;
unsigned long offset;
@ -875,7 +875,7 @@ static void guc_create_log(struct intel_guc *guc)
guc->log_flags = (offset << GUC_LOG_BUF_ADDR_SHIFT) | flags;
}
static void init_guc_policies(struct guc_policies *policies)
static void guc_policies_init(struct guc_policies *policies)
{
struct guc_policy *policy;
u32 p, i;
@ -897,7 +897,7 @@ static void init_guc_policies(struct guc_policies *policies)
policies->is_valid = 1;
}
static void guc_create_ads(struct intel_guc *guc)
static void guc_addon_create(struct intel_guc *guc)
{
struct drm_i915_private *dev_priv = guc_to_i915(guc);
struct i915_vma *vma;
@ -940,7 +940,7 @@ static void guc_create_ads(struct intel_guc *guc)
/* GuC scheduling policies */
policies = (void *)ads + sizeof(struct guc_ads);
init_guc_policies(policies);
guc_policies_init(policies);
ads->scheduler_policies =
i915_ggtt_offset(vma) + sizeof(struct guc_ads);
@ -971,9 +971,11 @@ static void guc_create_ads(struct intel_guc *guc)
*/
int i915_guc_submission_init(struct drm_i915_private *dev_priv)
{
const size_t ctxsize = sizeof(struct guc_context_desc);
const size_t poolsize = GUC_MAX_GPU_CONTEXTS * ctxsize;
const size_t gemsize = round_up(poolsize, PAGE_SIZE);
struct intel_guc *guc = &dev_priv->guc;
struct i915_vma *vma;
u32 size;
/* Wipe bitmap & delete client in case of reinitialisation */
bitmap_clear(guc->doorbell_bitmap, 0, GUC_MAX_DOORBELLS);
@ -985,15 +987,14 @@ int i915_guc_submission_init(struct drm_i915_private *dev_priv)
if (guc->ctx_pool_vma)
return 0; /* already allocated */
size = PAGE_ALIGN(GUC_MAX_GPU_CONTEXTS*sizeof(struct guc_context_desc));
vma = guc_allocate_vma(guc, size);
vma = guc_allocate_vma(guc, gemsize);
if (IS_ERR(vma))
return PTR_ERR(vma);
guc->ctx_pool_vma = vma;
ida_init(&guc->ctx_ids);
guc_create_log(guc);
guc_create_ads(guc);
guc_log_create(guc);
guc_addon_create(guc);
return 0;
}

2
drivers/gpu/drm/i915/intel_guc.h
View File

@ -159,7 +159,7 @@ extern int intel_guc_resume(struct drm_device *dev);
/* i915_guc_submission.c */
int i915_guc_submission_init(struct drm_i915_private *dev_priv);
int i915_guc_submission_enable(struct drm_i915_private *dev_priv);
int i915_guc_wq_check_space(struct drm_i915_gem_request *rq);
int i915_guc_wq_reserve(struct drm_i915_gem_request *rq);
void i915_guc_submission_disable(struct drm_i915_private *dev_priv);
void i915_guc_submission_fini(struct drm_i915_private *dev_priv);

2
drivers/gpu/drm/i915/intel_lrc.c
View File

@ -627,7 +627,7 @@ int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request
* going any further, as the i915_add_request() call
* later on mustn't fail ...
*/
ret = i915_guc_wq_check_space(request);
ret = i915_guc_wq_reserve(request);
if (ret)
return ret;
}