On Fri, Jul 03, 2015 at 01:30:32PM +0100, Dave Gordon wrote:
> A GuC client has its own doorbell and workqueue. It maintains the
> doorbell cache line, process description object and work queue item.
>
> A default guc_client is created for the i915 driver to use for
> normal-priority in-order submission.
>
> Note that the created client is not yet ready for use; doorbell
> allocation will fail as we haven't yet linked the GuC's context
> descriptor to the default contexts for each ring (see later patch).
> However the driver will still be usable, automatically falling
> back to execlist mode.
>
> v2:
> Defer adding structure members until needed [Chris Wilson]
> Rationalise type declarations [Chris Wilson]
>
> Issue: VIZ-4884
> Signed-off-by: Alex Dai <yu....@intel.com>
> Signed-off-by: Dave Gordon <david.s.gor...@intel.com>
> ---
> drivers/gpu/drm/i915/i915_guc_submission.c | 661
> +++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/intel_guc.h | 43 ++
> drivers/gpu/drm/i915/intel_guc_loader.c | 10 +
> 3 files changed, 714 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c
> b/drivers/gpu/drm/i915/i915_guc_submission.c
> index e9d46d6..3c28c8b 100644
> --- a/drivers/gpu/drm/i915/i915_guc_submission.c
> +++ b/drivers/gpu/drm/i915/i915_guc_submission.c
> @@ -27,6 +27,524 @@
> #include "intel_guc.h"
>
> /**
> + * DOC: GuC Client
You need to pull all your shiny new kerneldoc into the drm.tmpl, otherwise
it won't show up. You can build the drm/i915 docbook with
$ make htmldocs
Looking at what we have right now for gem a section next to the execlist
one would fit best I think.
Thanks, Daniel
> + *
> + * i915_guc_client:
> + * We use the term client to avoid confusion with contexts. A
> i915_guc_client is
> + * equivalent to GuC object guc_context_desc. This context descriptor is
> + * allocated from a pool of 1024 entries. Kernel driver will allocate
> doorbell
> + * and workqueue for it. Also the process descriptor (guc_process_desc),
> which
> + * is mapped to client space. So the client can write Work Item then ring the
> + * doorbell.
> + *
> + * To simplify the implementation, we allocate one gem object that contains
> all
> + * pages for doorbell, process descriptor and workqueue.
> + *
> + * The Scratch registers:
> + * There are 16 MMIO-based registers start from 0xC180. The kernel driver
> writes
> + * a value to the action register (SOFT_SCRATCH_0) along with any data. It
> then
> + * triggers an interrupt on the GuC via another register write (0xC4C8).
> + * Firmware writes a success/fail code back to the action register after
> + * processes the request. The kernel driver polls waiting for this update and
> + * then proceeds.
> + * See host2guc_action()
> + *
> + * Doorbells:
> + * Doorbells are interrupts to uKernel. A doorbell is a single cache line
> (QW)
> + * mapped into process space.
> + *
> + * Work Items:
> + * There are several types of work items that the host may place into a
> + * workqueue, each with its own requirements and limitations. Currently only
> + * 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()
> + *
> + */
> +
> +/*
> + * Read GuC command/status register (SOFT_SCRATCH_0)
> + * Return true if it contains a response rather than a command
> + */
> +static inline bool host2guc_action_response(struct drm_i915_private
> *dev_priv,
> + u32 *status)
> +{
> + u32 val = I915_READ(SOFT_SCRATCH(0));
> + *status = val;
> + return GUC2HOST_IS_RESPONSE(val);
> +}
> +
> +static int host2guc_action(struct intel_guc *guc, u32 *data, u32 len)
> +{
> + struct drm_i915_private *dev_priv = guc_to_i915(guc);
> + u32 status;
> + int i;
> + int ret;
> +
> + if (WARN_ON(len < 1 || len > 15))
> + return -EINVAL;
> +
> + spin_lock(&dev_priv->guc.host2guc_lock);
> +
> + dev_priv->guc.action_count += 1;
> + dev_priv->guc.action_cmd = data[0];
> +
> + for (i = 0; i < len; i++)
> + I915_WRITE(SOFT_SCRATCH(i), data[i]);
> +
> + POSTING_READ(SOFT_SCRATCH(i - 1));
> +
> + I915_WRITE(HOST2GUC_INTERRUPT, HOST2GUC_TRIGGER);
> +
> + ret = wait_for_atomic(host2guc_action_response(dev_priv, &status), 10);
> + if (status != GUC2HOST_STATUS_SUCCESS) {
> + /* either GuC doesn't respond, which is a TIMEOUT,
> + * or a failure code is returned. */
> + if (ret != -ETIMEDOUT)
> + ret = -EIO;
> +
> + DRM_ERROR("GUC: host2guc action 0x%X failed. ret=%d "
> + "status=0x%08X response=0x%08X\n",
> + data[0], ret, status,
> + I915_READ(SOFT_SCRATCH(15)));
> +
> + dev_priv->guc.action_fail += 1;
> + dev_priv->guc.action_err = ret;
> + }
> + dev_priv->guc.action_status = status;
> +
> + spin_unlock(&dev_priv->guc.host2guc_lock);
> +
> + return ret;
> +}
> +
> +/*
> + * Tell the GuC to allocate or deallocate a specific doorbell
> + */
> +
> +static int host2guc_allocate_doorbell(struct intel_guc *guc,
> + struct i915_guc_client *client)
> +{
> + u32 data[2];
> +
> + data[0] = HOST2GUC_ACTION_ALLOCATE_DOORBELL;
> + data[1] = client->ctx_index;
> +
> + return host2guc_action(guc, data, 2);
> +}
> +
> +static int host2guc_release_doorbell(struct intel_guc *guc,
> + struct i915_guc_client *client)
> +{
> + u32 data[2];
> +
> + data[0] = HOST2GUC_ACTION_DEALLOCATE_DOORBELL;
> + data[1] = client->ctx_index;
> +
> + return host2guc_action(guc, data, 2);
> +}
> +
> +/*
> + * Initialise, update, or clear doorbell data shared with the GuC
> + *
> + * These functions modify shared data and so need access to the mapped
> + * client object which contains the page being used for the doorbell
> + */
> +
> +static void guc_init_doorbell(struct intel_guc *guc,
> + struct i915_guc_client *client)
> +{
> + struct guc_doorbell_info *doorbell;
> + void *base;
> +
> + base = kmap_atomic(i915_gem_object_get_page(client->client_obj, 0));
> + doorbell = base + client->doorbell_offset;
> +
> + doorbell->db_status = 1;
> + doorbell->cookie = 0;
> +
> + kunmap_atomic(base);
> +}
> +
> +static int guc_ring_doorbell(struct i915_guc_client *gc)
> +{
> + struct guc_process_desc *desc;
> + union guc_doorbell_qw db_cmp, db_exc, db_ret;
> + union guc_doorbell_qw *db;
> + void *base;
> + int attempt = 2, ret = -EAGAIN;
> +
> + base = kmap_atomic(i915_gem_object_get_page(gc->client_obj, 0));
> + desc = base + gc->proc_desc_offset;
> +
> + /* Update the tail so it is visible to GuC */
> + desc->tail = gc->wq_tail;
> +
> + /* current cookie */
> + db_cmp.db_status = GUC_DOORBELL_ENABLED;
> + db_cmp.cookie = gc->cookie;
> +
> + /* cookie to be updated */
> + db_exc.db_status = GUC_DOORBELL_ENABLED;
> + db_exc.cookie = gc->cookie + 1;
> + if (db_exc.cookie == 0)
> + db_exc.cookie = 1;
> +
> + /* pointer of current doorbell cacheline */
> + db = base + gc->doorbell_offset;
> +
> + while (attempt--) {
> + /* lets ring the doorbell */
> + db_ret.value_qw = atomic64_cmpxchg((atomic64_t *)db,
> + db_cmp.value_qw, db_exc.value_qw);
> +
> + /* if the exchange was successfully executed */
> + if (db_ret.value_qw == db_cmp.value_qw) {
> + /* db was successfully rung */
> + gc->cookie = db_exc.cookie;
> + ret = 0;
> + break;
> + }
> +
> + /* XXX: doorbell was lost and need to acquire it again */
> + if (db_ret.db_status == GUC_DOORBELL_DISABLED)
> + break;
> +
> + DRM_ERROR("Cookie mismatch. Expected %d, returned %d\n",
> + db_cmp.cookie, db_ret.cookie);
> +
> + /* update the cookie to newly read cookie from GuC */
> + db_cmp.cookie = db_ret.cookie;
> + db_exc.cookie = db_ret.cookie + 1;
> + if (db_exc.cookie == 0)
> + db_exc.cookie = 1;
> + }
> +
> + kunmap_atomic(base);
> + return ret;
> +}
> +
> +static void guc_disable_doorbell(struct intel_guc *guc,
> + struct i915_guc_client *client)
> +{
> + struct drm_i915_private *dev_priv = guc_to_i915(guc);
> + struct guc_doorbell_info *doorbell;
> + void *base;
> + int drbreg = GEN8_DRBREGL(client->doorbell_id);
> + int value;
> +
> + base = kmap_atomic(i915_gem_object_get_page(client->client_obj, 0));
> + doorbell = base + client->doorbell_offset;
> +
> + doorbell->db_status = 0;
> +
> + kunmap_atomic(base);
> +
> + I915_WRITE(drbreg, I915_READ(drbreg) & ~GEN8_DRB_VALID);
> +
> + value = I915_READ(drbreg);
> + WARN_ON((value & GEN8_DRB_VALID) != 0);
> +
> + I915_WRITE(GEN8_DRBREGU(client->doorbell_id), 0);
> + I915_WRITE(drbreg, 0);
> +
> + /* XXX: wait for any interrupts */
> + /* XXX: wait for workqueue to drain */
> +}
> +
> +/*
> + * Select, assign and relase doorbell cachelines
> + *
> + * These functions track which doorbell cachelines are in use.
> + * The data they manipulate is protected by the host2guc lock.
> + */
> +
> +static uint32_t select_doorbell_cacheline(struct intel_guc *guc)
> +{
> + const uint32_t cacheline_size = boot_cpu_data.x86_clflush_size;
> + uint32_t offset;
> +
> + spin_lock(&guc->host2guc_lock);
> +
> + /* Doorbell uses a single cache line within a page */
> + offset = guc->db_cacheline & PAGE_MASK;
> +
> + /* Moving to next cache line to reduce contention */
> + guc->db_cacheline += cacheline_size;
> +
> + spin_unlock(&guc->host2guc_lock);
> +
> + return offset;
> +}
> +
> +static uint16_t assign_doorbell(struct intel_guc *guc, uint32_t priority)
> +{
> + /* The bitmap is split into two halves - high and normal priority. */
> + const uint16_t half = GUC_MAX_DOORBELLS / 2;
> + const uint16_t start = (priority <= GUC_CTX_PRIORITY_HIGH) ? half : 0;
> + const uint16_t end = start + half;
> + uint16_t id;
> +
> + spin_lock(&guc->host2guc_lock);
> + id = find_next_zero_bit(guc->doorbell_bitmap, end, start);
> + if (id == end)
> + id = GUC_INVALID_DOORBELL_ID;
> + else
> + bitmap_set(guc->doorbell_bitmap, id, 1);
> + spin_unlock(&guc->host2guc_lock);
> +
> + return id;
> +}
> +
> +static void release_doorbell(struct intel_guc *guc, uint16_t id)
> +{
> + spin_lock(&guc->host2guc_lock);
> + bitmap_clear(guc->doorbell_bitmap, id, 1);
> + spin_unlock(&guc->host2guc_lock);
> +}
> +
> +/*
> + * Initialise the process descriptor shared with the GuC firmware.
> + */
> +static void guc_init_proc_desc(struct intel_guc *guc,
> + struct i915_guc_client *client)
> +{
> + struct guc_process_desc *desc;
> + void *base;
> +
> + base = kmap_atomic(i915_gem_object_get_page(client->client_obj, 0));
> + desc = base + client->proc_desc_offset;
> +
> + memset(desc, 0, sizeof(*desc));
> +
> + /*
> + * XXX: pDoorbell and WQVBaseAddress are pointers in process address
> + * space for ring3 clients (set them as in mmap_ioctl) or kernel
> + * space for kernel clients (map on demand instead? May make debug
> + * easier to have it mapped).
> + */
> + desc->wq_base_addr = 0;
> + desc->db_base_addr = 0;
> +
> + desc->context_id = client->ctx_index;
> + desc->wq_size_bytes = client->wq_size;
> + desc->wq_status = WQ_STATUS_ACTIVE;
> + desc->priority = client->priority;
> +
> + kunmap_atomic(base);
> +}
> +
> +/*
> + * Initialise/clear the context descriptor shared with the GuC firmware.
> + *
> + * This descriptor tells the GuC where (in GGTT space) to find the important
> + * data structures relating to this client (doorbell, process descriptor,
> + * write queue, etc).
> + */
> +
> +static void guc_init_ctx_desc(struct intel_guc *guc,
> + struct i915_guc_client *client)
> +{
> + struct guc_context_desc desc;
> + struct sg_table *sg;
> +
> + memset(&desc, 0, sizeof(desc));
> +
> + desc.attribute = GUC_CTX_DESC_ATTR_ACTIVE | GUC_CTX_DESC_ATTR_KERNEL;
> + desc.context_id = client->ctx_index;
> + desc.priority = client->priority;
> + desc.engines_used = (1 << RCS) | (1 << VCS) | (1 << BCS) |
> + (1 << VECS) | (1 << VCS2); /* all engines */
> + desc.db_id = client->doorbell_id;
> +
> + /*
> + * The CPU address is only needed at certain points, so kmap_atomic on
> + * demand instead of storing it in the ctx descriptor.
> + * XXX: May make debug easier to have it mapped
> + */
> + desc.db_trigger_cpu = 0;
> + desc.db_trigger_uk = client->doorbell_offset +
> + i915_gem_obj_ggtt_offset(client->client_obj);
> + desc.db_trigger_phy = client->doorbell_offset +
> + sg_dma_address(client->client_obj->pages->sgl);
> +
> + desc.process_desc = client->proc_desc_offset +
> + i915_gem_obj_ggtt_offset(client->client_obj);
> +
> + desc.wq_addr = client->wq_offset +
> + i915_gem_obj_ggtt_offset(client->client_obj);
> +
> + desc.wq_size = client->wq_size;
> +
> + /*
> + * XXX: Take LRCs from an existing intel_context if this is not an
> + * IsKMDCreatedContext client
> + */
> + desc.desc_private = (uintptr_t)client;
> +
> + /* Pool context is pinned already */
> + sg = guc->ctx_pool_obj->pages;
> + sg_pcopy_from_buffer(sg->sgl, sg->nents, &desc, sizeof(desc),
> + sizeof(desc) * client->ctx_index);
> +}
> +
> +static void guc_fini_ctx_desc(struct intel_guc *guc,
> + struct i915_guc_client *client)
> +{
> + struct guc_context_desc desc;
> + struct sg_table *sg;
> +
> + memset(&desc, 0, sizeof(desc));
> +
> + sg = guc->ctx_pool_obj->pages;
> + sg_pcopy_from_buffer(sg->sgl, sg->nents, &desc, sizeof(desc),
> + sizeof(desc) * client->ctx_index);
> +}
> +
> +/* Get valid workqueue item and return it back to offset */
> +static int guc_get_workqueue_space(struct i915_guc_client *gc, u32 *offset)
> +{
> + struct guc_process_desc *desc;
> + void *base;
> + u32 size = sizeof(struct guc_wq_item);
> + int ret = 0, timeout_counter = 200;
> + unsigned long flags;
> +
> + base = kmap_atomic(i915_gem_object_get_page(gc->client_obj, 0));
> + desc = base + gc->proc_desc_offset;
> +
> + while (timeout_counter-- > 0) {
> + spin_lock_irqsave(&gc->wq_lock, flags);
> +
> + ret = wait_for_atomic(CIRC_SPACE(gc->wq_tail, desc->head,
> + gc->wq_size) >= size, 1);
> +
> + if (!ret) {
> + *offset = gc->wq_tail;
> +
> + /* advance the tail for next workqueue item */
> + gc->wq_tail += size;
> + gc->wq_tail &= gc->wq_size - 1;
> +
> + /* this will break the loop */
> + timeout_counter = 0;
> + }
> +
> + spin_unlock_irqrestore(&gc->wq_lock, flags);
> + };
> +
> + kunmap_atomic(base);
> +
> + return ret;
> +}
> +
> +static int guc_add_workqueue_item(struct i915_guc_client *gc,
> + struct intel_context *ctx,
> + struct intel_engine_cs *ring)
> +{
> + struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state;
> + struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf;
> + struct guc_wq_item *wqi;
> + void *base;
> + u32 tail, wq_len, wq_off = 0;
> + int ret;
> +
> + ret = guc_get_workqueue_space(gc, &wq_off);
> + if (ret)
> + return ret;
> +
> + /* For now workqueue item is 4 DWs; workqueue buffer is 2 pages. So we
> + * should not have the case where structure wqi is across page, neither
> + * wrapped to the beginning. This simplifies the implementation below.
> + *
> + * XXX: if not the case, we need save data to a temp wqi and copy it to
> + * workqueue buffer dw by dw.
> + */
> + WARN_ON(sizeof(struct guc_wq_item) != 16);
> + WARN_ON(wq_off & 3);
> +
> + /* wq starts from the page after doorbell / process_desc */
> + base = kmap_atomic(i915_gem_object_get_page(gc->client_obj,
> + (wq_off + GUC_DB_SIZE) >> PAGE_SHIFT));
> + wq_off &= PAGE_SIZE - 1;
> + wqi = (struct guc_wq_item *)((char *)base + wq_off);
> +
> + /* len does not include the header */
> + wq_len = sizeof(struct guc_wq_item) / sizeof(u32) - 1;
> + wqi->header = WQ_TYPE_INORDER |
> + (wq_len << WQ_LEN_SHIFT) |
> + (ring->id << WQ_TARGET_SHIFT) |
> + WQ_NO_WCFLUSH_WAIT;
> +
> + /* The GuC wants only the low-order word of the context descriptor */
> + wqi->context_desc = (u32)intel_lr_context_descriptor(ring, ctx_obj);
> +
> + /* The GuC firmware wants the tail index in QWords, not bytes */
> + tail = ringbuf->tail >> 3;
> + wqi->ring_tail = tail << WQ_RING_TAIL_SHIFT;
> + wqi->fence_id = 0; /*XXX: what fence to be here */
> +
> + kunmap_atomic(base);
> +
> + return 0;
> +}
> +
> +static void update_context_image(struct intel_context *ctx,
> + struct intel_engine_cs *ring)
> +{
> + struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state;
> + struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf;
> +
> + intel_lr_context_update(ctx_obj, ringbuf->obj, ~0u);
> +}
> +
> +/**
> + * i915_guc_submit() - Submit commands through GuC
> + * @client: the guc client where commands will go through
> + * @ctx: LRC where commands come from
> + * @ring: HW engine that will excute the commands
> + *
> + * Return: 0 if succeed
> + */
> +int i915_guc_submit(struct i915_guc_client *client,
> + struct intel_context *ctx,
> + struct intel_engine_cs *ring)
> +{
> + int q_ret, b_ret;
> + unsigned long flags;
> +
> + /* Need this because of the deferred pin ctx and ring */
> + /* Shall we move this right after ring is pinned? */
> + update_context_image(ctx, ring);
> +
> + q_ret = guc_add_workqueue_item(client, ctx, ring);
> + if (q_ret == 0)
> + b_ret = guc_ring_doorbell(client);
> +
> + spin_lock_irqsave(&client->wq_lock, flags);
> + client->submissions += 1;
> + if (q_ret) {
> + client->q_fail += 1;
> + client->retcode = q_ret;
> + } else if (b_ret) {
> + client->b_fail += 1;
> + client->retcode = q_ret = b_ret;
> + } else {
> + client->retcode = 0;
> + }
> + spin_unlock_irqrestore(&client->wq_lock, flags);
> +
> + return q_ret;
> +}
> +
> +/*
> + * Everything below here is concerned with setup & teardown, and is
> + * therefore not part of the somewhat time-critical batch-submission
> + * path of i915_guc_submit() above.
> + */
> +
> +/**
> * gem_allocate_guc_obj() - Allocate gem object for GuC usage
> * @dev: drm device
> * @size: size of object
> @@ -75,6 +593,121 @@ static void gem_release_guc_obj(struct
> drm_i915_gem_object *obj)
> drm_gem_object_unreference(&obj->base);
> }
>
> +static void guc_client_free(struct drm_device *dev,
> + struct i915_guc_client *client)
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_guc *guc = &dev_priv->guc;
> +
> + if (!client)
> + return;
> +
> + if (client->doorbell_id != GUC_INVALID_DOORBELL_ID) {
> + /*
> + * First disable the doorbell, then tell the GuC we've
> + * finished with it, finally deallocate it in our bitmap
> + */
> + guc_disable_doorbell(guc, client);
> + host2guc_release_doorbell(guc, client);
> + release_doorbell(guc, client->doorbell_id);
> + }
> +
> + /*
> + * XXX: wait for any outstanding submissions before freeing memory.
> + * Be sure to drop any locks
> + */
> +
> + gem_release_guc_obj(client->client_obj);
> +
> + if (client->ctx_index != GUC_INVALID_CTX_ID) {
> + guc_fini_ctx_desc(guc, client);
> + ida_simple_remove(&guc->ctx_ids, client->ctx_index);
> + }
> +
> + kfree(client);
> +}
> +
> +/**
> + * guc_client_alloc() - Allocate an i915_guc_client
> + * @dev: drm device
> + * @priority: four levels priority _CRITICAL, _HIGH, _NORMAL and _LOW
> + * The kernel client to replace ExecList submission is created with
> + * NORMAL priority. Priority of a client for scheduler can be HIGH,
> + * while a preemption context can use CRITICAL.
> + *
> + * Return: An i915_guc_client object if success.
> + */
> +static struct i915_guc_client *guc_client_alloc(struct drm_device *dev,
> + uint32_t priority)
> +{
> + struct i915_guc_client *client;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_guc *guc = &dev_priv->guc;
> + struct drm_i915_gem_object *obj;
> +
> + client = kzalloc(sizeof(*client), GFP_KERNEL);
> + if (!client)
> + return NULL;
> +
> + client->doorbell_id = GUC_INVALID_DOORBELL_ID;
> + client->priority = priority;
> +
> + 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;
> + }
> +
> + /* The first page is doorbell/proc_desc. Two followed pages are wq. */
> + obj = gem_allocate_guc_obj(dev, GUC_DB_SIZE + GUC_WQ_SIZE);
> + if (!obj)
> + goto err;
> +
> + client->client_obj = obj;
> + client->wq_offset = GUC_DB_SIZE;
> + client->wq_size = GUC_WQ_SIZE;
> + spin_lock_init(&client->wq_lock);
> +
> + client->doorbell_offset = select_doorbell_cacheline(guc);
> +
> + /*
> + * Since the doorbell only requires a single cacheline, we can save
> + * space by putting the application process descriptor in the same
> + * page. Use the half of the page that doesn't include the doorbell.
> + */
> + if (client->doorbell_offset >= (GUC_DB_SIZE / 2))
> + client->proc_desc_offset = 0;
> + else
> + client->proc_desc_offset = (GUC_DB_SIZE / 2);
> +
> + client->doorbell_id = assign_doorbell(guc, client->priority);
> + if (client->doorbell_id == GUC_INVALID_DOORBELL_ID)
> + /* XXX: evict a doorbell instead */
> + goto err;
> +
> + guc_init_proc_desc(guc, client);
> + guc_init_ctx_desc(guc, client);
> + guc_init_doorbell(guc, client);
> +
> + /* Invalidate GuC TLB to let GuC take the latest updates to GTT. */
> + I915_WRITE(GEN8_GTCR, GEN8_GTCR_INVALIDATE);
> +
> + /* XXX: Any cache flushes needed? General domain mgmt calls? */
> +
> + if (host2guc_allocate_doorbell(guc, client))
> + goto err;
> +
> + DRM_DEBUG_DRIVER("new priority %u client %p: ctx_index %u db_id %u\n",
> + priority, client, client->ctx_index, client->doorbell_id);
> +
> + return client;
> +
> +err:
> + guc_client_free(dev, client);
> + return NULL;
> +}
> +
> static void guc_create_log(struct intel_guc *guc)
> {
> struct drm_i915_private *dev_priv = guc_to_i915(guc);
> @@ -138,6 +771,8 @@ int i915_guc_submission_init(struct drm_device *dev)
> if (!guc->ctx_pool_obj)
> return -ENOMEM;
>
> + spin_lock_init(&dev_priv->guc.host2guc_lock);
> +
> ida_init(&guc->ctx_ids);
>
> guc_create_log(guc);
> @@ -145,6 +780,32 @@ int i915_guc_submission_init(struct drm_device *dev)
> return 0;
> }
>
> +int i915_guc_submission_enable(struct drm_device *dev)
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_guc *guc = &dev_priv->guc;
> + struct i915_guc_client *client;
> +
> + /* client for execbuf submission */
> + client = guc_client_alloc(dev, GUC_CTX_PRIORITY_NORMAL);
> + if (!client) {
> + DRM_ERROR("Failed to create execbuf guc_client\n");
> + return -ENOMEM;
> + }
> +
> + guc->execbuf_client = client;
> + return 0;
> +}
> +
> +void i915_guc_submission_disable(struct drm_device *dev)
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_guc *guc = &dev_priv->guc;
> +
> + guc_client_free(dev, guc->execbuf_client);
> + guc->execbuf_client = NULL;
> +}
> +
> void i915_guc_submission_fini(struct drm_device *dev)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
> diff --git a/drivers/gpu/drm/i915/intel_guc.h
> b/drivers/gpu/drm/i915/intel_guc.h
> index 3de9096..5bed529 100644
> --- a/drivers/gpu/drm/i915/intel_guc.h
> +++ b/drivers/gpu/drm/i915/intel_guc.h
> @@ -28,6 +28,30 @@
> #include "intel_guc_fwif.h"
> #include "i915_guc_reg.h"
>
> +struct i915_guc_client {
> + struct drm_i915_gem_object *client_obj;
> + uint32_t priority;
> + uint32_t ctx_index;
> +
> + uint32_t proc_desc_offset;
> + uint32_t doorbell_offset;
> + uint32_t cookie;
> + uint16_t doorbell_id;
> + uint16_t padding; /* Maintain alignment */
> +
> + uint32_t wq_offset;
> + uint32_t wq_size;
> +
> + spinlock_t wq_lock; /* Protects all data below */
> + uint32_t wq_tail;
> +
> + /* GuC submission statistics & status */
> + uint64_t submissions;
> + uint32_t q_fail;
> + uint32_t b_fail;
> + int retcode;
> +};
> +
> struct intel_guc {
> /* Generic uC firmware management */
> struct intel_uc_fw guc_fw;
> @@ -43,6 +67,20 @@ struct intel_guc {
>
> struct drm_i915_gem_object *ctx_pool_obj;
> struct ida ctx_ids;
> +
> + struct i915_guc_client *execbuf_client;
> +
> + spinlock_t host2guc_lock; /* Protects all data below */
> +
> + DECLARE_BITMAP(doorbell_bitmap, GUC_MAX_DOORBELLS);
> + int db_cacheline;
> +
> + /* Action status & statistics */
> + uint64_t action_count; /* Total commands issued */
> + uint32_t action_cmd; /* Last command word */
> + uint32_t action_status; /* Last return status */
> + uint32_t action_fail; /* Total number of failures */
> + int32_t action_err; /* Last error code */
> };
>
> /* intel_guc_loader.c */
> @@ -52,6 +90,11 @@ extern void intel_guc_ucode_fini(struct drm_device *dev);
>
> /* i915_guc_submission.c */
> int i915_guc_submission_init(struct drm_device *dev);
> +int i915_guc_submission_enable(struct drm_device *dev);
> +int i915_guc_submit(struct i915_guc_client *client,
> + struct intel_context *ctx,
> + struct intel_engine_cs *ring);
> +void i915_guc_submission_disable(struct drm_device *dev);
> void i915_guc_submission_fini(struct drm_device *dev);
>
> #endif
> diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c
> b/drivers/gpu/drm/i915/intel_guc_loader.c
> index deeaa20..eb76c34 100644
> --- a/drivers/gpu/drm/i915/intel_guc_loader.c
> +++ b/drivers/gpu/drm/i915/intel_guc_loader.c
> @@ -417,6 +417,8 @@ int intel_guc_ucode_load(struct drm_device *dev)
> intel_uc_fw_status_repr(guc_fw->uc_fw_fetch_status),
> intel_uc_fw_status_repr(guc_fw->uc_fw_load_status));
>
> + i915_guc_submission_disable(dev);
> +
> if (guc_fw->uc_fw_fetch_status == INTEL_UC_FIRMWARE_NONE)
> return 0;
>
> @@ -444,12 +446,20 @@ int intel_guc_ucode_load(struct drm_device *dev)
> intel_uc_fw_status_repr(guc_fw->uc_fw_fetch_status),
> intel_uc_fw_status_repr(guc_fw->uc_fw_load_status));
>
> + if (i915.enable_guc_submission) {
> + err = i915_guc_submission_enable(dev);
> + if (err)
> + goto fail;
> + }
> +
> return 0;
>
> fail:
> if (guc_fw->uc_fw_load_status == INTEL_UC_FIRMWARE_PENDING)
> guc_fw->uc_fw_load_status = INTEL_UC_FIRMWARE_FAIL;
>
> + i915_guc_submission_disable(dev);
> +
> DRM_ERROR("Failed to initialize GuC, error %d\n", err);
>
> return err;
> --
> 1.9.1
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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