Merge tag 'drm-for-v4.16' of git://people.freedesktop.org/~airlied/linux

Pull drm updates from Dave Airlie:
 "This seems to have been a comparatively quieter merge window, I assume
  due to holidays etc. The "biggest" change is AMD header cleanups, which
  merge/remove a bunch of them. The AMD gpu scheduler is now being made generic
  with the etnaviv driver wanting to reuse the code, hopefully other drivers
  can go in the same direction.

  Otherwise it's the usual lots of stuff in i915/amdgpu, not so much stuff
  elsewhere.

  Core:
   - Add .last_close and .output_poll_changed helpers to reduce driver footprints
   - Fix plane clipping
   - Improved debug printing support
   - Add panel orientation property
   - Update edid derived properties at edid setting
   - Reduction in fbdev driver footprint
   - Move amdgpu scheduler into core for other drivers to use.

  i915:
   - Selftest and IGT improvements
   - Fast boot prep work on IPS, pipe config
   - HW workarounds for Cannonlake, Geminilake
   - Cannonlake clock and HDMI2.0 fixes
   - GPU cache invalidation and context switch improvements
   - Display planes cleanup
   - New PMU interface for perf queries
   - New firmware support for KBL/SKL
   - Geminilake HW workaround for perforamce
   - Coffeelake stolen memory improvements
   - GPU reset robustness work
   - Cannonlake horizontal plane flipping
   - GVT work

  amdgpu/radeon:
   - RV and Vega header file cleanups (lots of lines gone!)
   - TTM operation context support
   - 48-bit GPUVM support for Vega/RV
   - ECC support for Vega
   - Resizeable BAR support
   - Multi-display sync support
   - Enable swapout for reserved BOs during allocation
   - S3 fixes on Raven
   - GPU reset cleanup and fixes
   - 2+1 level GPU page table

  amdkfd:
   - GFX7/8 SDMA user queues support
   - Hardware scheduling for multiple processes
   - dGPU prep work

  rcar:
   - Added R8A7743/5 support
   - System suspend/resume support

  sun4i:
   - Multi-plane support for YUV formats
   - A83T and LVDS support

  msm:
   - Devfreq support for GPU

  tegra:
   - Prep work for adding Tegra186 support
   - Tegra186 HDMI support
   - HDMI2.0 and zpos support by using generic helpers

  tilcdc:
   - Misc fixes

  omapdrm:
   - Support memory bandwidth limits
   - DSI command mode panel cleanups
   - DMM error handling

  exynos:
   - drop the old IPP subdriver.

  etnaviv:
   - Occlusion query fixes
   - Job handling fixes
   - Prep work for hooking in gpu scheduler

  armada:
   - Move closer to atomic modesetting
   - Allow disabling primary plane if overlay is full screen

  imx:
   - Format modifier support
   - Add tile prefetch to PRE
   - Runtime PM support for PRG

  ast:
   - fix LUT loading"

* tag 'drm-for-v4.16' of git://people.freedesktop.org/~airlied/linux: (1471 commits)
  drm/ast: Load lut in crtc_commit
  drm: Check for lessee in DROP_MASTER ioctl
  drm: fix gpu scheduler link order
  drm/amd/display: Demote error print to debug print when ATOM impl missing
  dma-buf: fix reservation_object_wait_timeout_rcu once more v2
  drm/amdgpu: Avoid leaking PM domain on driver unbind (v2)
  drm/amd/amdgpu: Add Polaris version check
  drm/amdgpu: Reenable manual GPU reset from sysfs
  drm/amdgpu: disable MMHUB power gating on raven
  drm/ttm: Don't unreserve swapped BOs that were previously reserved
  drm/ttm: Don't add swapped BOs to swap-LRU list
  drm/amdgpu: only check for ECC on Vega10
  drm/amd/powerplay: Fix smu_table_entry.handle type
  drm/ttm: add VADDR_FLAG_UPDATED_COUNT to correctly update dma_page global count
  drm: Fix PANEL_ORIENTATION_QUIRKS breaking the Kconfig DRM menuconfig
  drm/radeon: fill in rb backend map on evergreen/ni.
  drm/amdgpu/gfx9: fix ngg enablement to clear gds reserved memory (v2)
  drm/ttm: only free pages rather than update global memory count together
  drm/amdgpu: fix CPU based VM updates
  drm/amdgpu: fix typo in amdgpu_vce_validate_bo
  ...

1 files changed, 1339 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_guc_submission.c b/drivers/gpu/drm/i915/intel_guc_submission.c
new file mode 100644
index 000000000000..4d2409466a3a
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_guc_submission.c
@@ -0,0 +1,1339 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include <linux/circ_buf.h>
+#include <trace/events/dma_fence.h>
+
+#include "intel_guc_submission.h"
+#include "i915_drv.h"
+
+/**
+ * DOC: GuC-based command submission
+ *
+ * GuC client:
+ * A intel_guc_client refers to a submission path through GuC. Currently, there
+ * are two clients. One of them (the execbuf_client) is charged with all
+ * submissions to the GuC, the other one (preempt_client) is responsible for
+ * preempting the execbuf_client. This struct is the owner of a doorbell, a
+ * process descriptor and a workqueue (all of them inside a single gem object
+ * that contains all required pages for these elements).
+ *
+ * GuC stage descriptor:
+ * During initialization, the driver allocates a static pool of 1024 such
+ * descriptors, and shares them with the GuC.
+ * Currently, there exists a 1:1 mapping between a intel_guc_client and a
+ * guc_stage_desc (via the client's stage_id), so effectively only one
+ * gets used. This stage descriptor lets the GuC know about the doorbell,
+ * workqueue and process descriptor. Theoretically, it also lets the GuC
+ * know about our HW contexts (context ID, etc...), but we actually
+ * employ a kind of submission where the GuC uses the LRCA sent via the work
+ * item instead (the single guc_stage_desc associated to execbuf client
+ * contains information about the default kernel context only, but this is
+ * essentially unused). This is called a "proxy" submission.
+ *
+ * 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 intel_guc_send()
+ *
+ * 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_request()
+ *
+ * ADS:
+ * The Additional Data Struct (ADS) has pointers for different buffers used by
+ * the GuC. One single gem object contains the ADS struct itself (guc_ads), the
+ * scheduling policies (guc_policies), a structure describing a collection of
+ * register sets (guc_mmio_reg_state) and some extra pages for the GuC to save
+ * its internal state for sleep.
+ *
+ */
+
+static inline bool is_high_priority(struct intel_guc_client *client)
+{
+	return (client->priority == GUC_CLIENT_PRIORITY_KMD_HIGH ||
+		client->priority == GUC_CLIENT_PRIORITY_HIGH);
+}
+
+static int reserve_doorbell(struct intel_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.
+	 */
+	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, end, offset);
+	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->stage_id, yesno(is_high_priority(client)),
+			 id);
+	return 0;
+}
+
+static void unreserve_doorbell(struct intel_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, u32 stage_id)
+{
+	u32 action[] = {
+		INTEL_GUC_ACTION_ALLOCATE_DOORBELL,
+		stage_id
+	};
+
+	return intel_guc_send(guc, action, ARRAY_SIZE(action));
+}
+
+static int __guc_deallocate_doorbell(struct intel_guc *guc, u32 stage_id)
+{
+	u32 action[] = {
+		INTEL_GUC_ACTION_DEALLOCATE_DOORBELL,
+		stage_id
+	};
+
+	return intel_guc_send(guc, action, ARRAY_SIZE(action));
+}
+
+static struct guc_stage_desc *__get_stage_desc(struct intel_guc_client *client)
+{
+	struct guc_stage_desc *base = client->guc->stage_desc_pool_vaddr;
+
+	return &base[client->stage_id];
+}
+
+/*
+ * 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 __update_doorbell_desc(struct intel_guc_client *client, u16 new_id)
+{
+	struct guc_stage_desc *desc;
+
+	/* Update the GuC's idea of the doorbell ID */
+	desc = __get_stage_desc(client);
+	desc->db_id = new_id;
+}
+
+static struct guc_doorbell_info *__get_doorbell(struct intel_guc_client *client)
+{
+	return client->vaddr + client->doorbell_offset;
+}
+
+static bool has_doorbell(struct intel_guc_client *client)
+{
+	if (client->doorbell_id == GUC_DOORBELL_INVALID)
+		return false;
+
+	return test_bit(client->doorbell_id, client->guc->doorbell_bitmap);
+}
+
+static void __create_doorbell(struct intel_guc_client *client)
+{
+	struct guc_doorbell_info *doorbell;
+
+	doorbell = __get_doorbell(client);
+	doorbell->db_status = GUC_DOORBELL_ENABLED;
+	doorbell->cookie = 0;
+}
+
+static void __destroy_doorbell(struct intel_guc_client *client)
+{
+	struct drm_i915_private *dev_priv = guc_to_i915(client->guc);
+	struct guc_doorbell_info *doorbell;
+	u16 db_id = client->doorbell_id;
+
+
+	doorbell = __get_doorbell(client);
+	doorbell->db_status = GUC_DOORBELL_DISABLED;
+	doorbell->cookie = 0;
+
+	/* Doorbell release flow requires that we wait for GEN8_DRB_VALID bit
+	 * to go to zero after updating db_status before we call the GuC to
+	 * release the doorbell
+	 */
+	if (wait_for_us(!(I915_READ(GEN8_DRBREGL(db_id)) & GEN8_DRB_VALID), 10))
+		WARN_ONCE(true, "Doorbell never became invalid after disable\n");
+}
+
+static int create_doorbell(struct intel_guc_client *client)
+{
+	int ret;
+
+	__update_doorbell_desc(client, client->doorbell_id);
+	__create_doorbell(client);
+
+	ret = __guc_allocate_doorbell(client->guc, client->stage_id);
+	if (ret) {
+		__destroy_doorbell(client);
+		__update_doorbell_desc(client, GUC_DOORBELL_INVALID);
+		DRM_ERROR("Couldn't create client %u doorbell: %d\n",
+			  client->stage_id, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int destroy_doorbell(struct intel_guc_client *client)
+{
+	int ret;
+
+	GEM_BUG_ON(!has_doorbell(client));
+
+	__destroy_doorbell(client);
+	ret = __guc_deallocate_doorbell(client->guc, client->stage_id);
+	if (ret)
+		DRM_ERROR("Couldn't destroy client %u doorbell: %d\n",
+			  client->stage_id, ret);
+
+	__update_doorbell_desc(client, GUC_DOORBELL_INVALID);
+
+	return ret;
+}
+
+static unsigned long __select_cacheline(struct intel_guc *guc)
+{
+	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 += 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;
+}
+
+static inline struct guc_process_desc *
+__get_process_desc(struct intel_guc_client *client)
+{
+	return client->vaddr + client->proc_desc_offset;
+}
+
+/*
+ * Initialise the process descriptor shared with the GuC firmware.
+ */
+static void guc_proc_desc_init(struct intel_guc *guc,
+			       struct intel_guc_client *client)
+{
+	struct guc_process_desc *desc;
+
+	desc = memset(__get_process_desc(client), 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->stage_id = client->stage_id;
+	desc->wq_size_bytes = GUC_WQ_SIZE;
+	desc->wq_status = WQ_STATUS_ACTIVE;
+	desc->priority = client->priority;
+}
+
+static int guc_stage_desc_pool_create(struct intel_guc *guc)
+{
+	struct i915_vma *vma;
+	void *vaddr;
+
+	vma = intel_guc_allocate_vma(guc,
+				     PAGE_ALIGN(sizeof(struct guc_stage_desc) *
+				     GUC_MAX_STAGE_DESCRIPTORS));
+	if (IS_ERR(vma))
+		return PTR_ERR(vma);
+
+	vaddr = i915_gem_object_pin_map(vma->obj, I915_MAP_WB);
+	if (IS_ERR(vaddr)) {
+		i915_vma_unpin_and_release(&vma);
+		return PTR_ERR(vaddr);
+	}
+
+	guc->stage_desc_pool = vma;
+	guc->stage_desc_pool_vaddr = vaddr;
+	ida_init(&guc->stage_ids);
+
+	return 0;
+}
+
+static void guc_stage_desc_pool_destroy(struct intel_guc *guc)
+{
+	ida_destroy(&guc->stage_ids);
+	i915_gem_object_unpin_map(guc->stage_desc_pool->obj);
+	i915_vma_unpin_and_release(&guc->stage_desc_pool);
+}
+
+/*
+ * Initialise/clear the stage 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_stage_desc_init(struct intel_guc *guc,
+				struct intel_guc_client *client)
+{
+	struct drm_i915_private *dev_priv = guc_to_i915(guc);
+	struct intel_engine_cs *engine;
+	struct i915_gem_context *ctx = client->owner;
+	struct guc_stage_desc *desc;
+	unsigned int tmp;
+	u32 gfx_addr;
+
+	desc = __get_stage_desc(client);
+	memset(desc, 0, sizeof(*desc));
+
+	desc->attribute = GUC_STAGE_DESC_ATTR_ACTIVE |
+			  GUC_STAGE_DESC_ATTR_KERNEL;
+	if (is_high_priority(client))
+		desc->attribute |= GUC_STAGE_DESC_ATTR_PREEMPT;
+	desc->stage_id = client->stage_id;
+	desc->priority = client->priority;
+	desc->db_id = client->doorbell_id;
+
+	for_each_engine_masked(engine, dev_priv, client->engines, tmp) {
+		struct intel_context *ce = &ctx->engine[engine->id];
+		u32 guc_engine_id = engine->guc_id;
+		struct guc_execlist_context *lrc = &desc->lrc[guc_engine_id];
+
+		/* TODO: We have a design issue to be solved here. Only when we
+		 * receive the first batch, we know which engine is used by the
+		 * user. But here GuC expects the lrc and ring to be pinned. It
+		 * is not an issue for default context, which is the only one
+		 * for now who owns a GuC client. But for future owner of GuC
+		 * client, need to make sure lrc is pinned prior to enter here.
+		 */
+		if (!ce->state)
+			break;	/* XXX: continue? */
+
+		/*
+		 * XXX: When this is a GUC_STAGE_DESC_ATTR_KERNEL client (proxy
+		 * submission or, in other words, not using a direct submission
+		 * model) the KMD's LRCA is not used for any work submission.
+		 * Instead, the GuC uses the LRCA of the user mode context (see
+		 * guc_add_request below).
+		 */
+		lrc->context_desc = lower_32_bits(ce->lrc_desc);
+
+		/* The state page is after PPHWSP */
+		lrc->ring_lrca =
+			guc_ggtt_offset(ce->state) + LRC_STATE_PN * PAGE_SIZE;
+
+		/* XXX: In direct submission, the GuC wants the HW context id
+		 * here. In proxy submission, it wants the stage id
+		 */
+		lrc->context_id = (client->stage_id << GUC_ELC_CTXID_OFFSET) |
+				(guc_engine_id << GUC_ELC_ENGINE_OFFSET);
+
+		lrc->ring_begin = guc_ggtt_offset(ce->ring->vma);
+		lrc->ring_end = lrc->ring_begin + ce->ring->size - 1;
+		lrc->ring_next_free_location = lrc->ring_begin;
+		lrc->ring_current_tail_pointer_value = 0;
+
+		desc->engines_used |= (1 << guc_engine_id);
+	}
+
+	DRM_DEBUG_DRIVER("Host engines 0x%x => GuC engines used 0x%x\n",
+			 client->engines, desc->engines_used);
+	WARN_ON(desc->engines_used == 0);
+
+	/*
+	 * The doorbell, process descriptor, and workqueue are all parts
+	 * of the client object, which the GuC will reference via the GGTT
+	 */
+	gfx_addr = guc_ggtt_offset(client->vma);
+	desc->db_trigger_phy = sg_dma_address(client->vma->pages->sgl) +
+				client->doorbell_offset;
+	desc->db_trigger_cpu = ptr_to_u64(__get_doorbell(client));
+	desc->db_trigger_uk = gfx_addr + client->doorbell_offset;
+	desc->process_desc = gfx_addr + client->proc_desc_offset;
+	desc->wq_addr = gfx_addr + GUC_DB_SIZE;
+	desc->wq_size = GUC_WQ_SIZE;
+
+	desc->desc_private = ptr_to_u64(client);
+}
+
+static void guc_stage_desc_fini(struct intel_guc *guc,
+				struct intel_guc_client *client)
+{
+	struct guc_stage_desc *desc;
+
+	desc = __get_stage_desc(client);
+	memset(desc, 0, sizeof(*desc));
+}
+
+/* Construct a Work Item and append it to the GuC's Work Queue */
+static void guc_wq_item_append(struct intel_guc_client *client,
+			       u32 target_engine, u32 context_desc,
+			       u32 ring_tail, u32 fence_id)
+{
+	/* wqi_len is in DWords, and does not include the one-word header */
+	const size_t wqi_size = sizeof(struct guc_wq_item);
+	const u32 wqi_len = wqi_size / sizeof(u32) - 1;
+	struct guc_process_desc *desc = __get_process_desc(client);
+	struct guc_wq_item *wqi;
+	u32 wq_off;
+
+	lockdep_assert_held(&client->wq_lock);
+
+	/* 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.
+	 */
+	BUILD_BUG_ON(wqi_size != 16);
+
+	/* Free space is guaranteed. */
+	wq_off = READ_ONCE(desc->tail);
+	GEM_BUG_ON(CIRC_SPACE(wq_off, READ_ONCE(desc->head),
+			      GUC_WQ_SIZE) < wqi_size);
+	GEM_BUG_ON(wq_off & (wqi_size - 1));
+
+	/* WQ starts from the page after doorbell / process_desc */
+	wqi = client->vaddr + wq_off + GUC_DB_SIZE;
+
+	/* Now fill in the 4-word work queue item */
+	wqi->header = WQ_TYPE_INORDER |
+		      (wqi_len << WQ_LEN_SHIFT) |
+		      (target_engine << WQ_TARGET_SHIFT) |
+		      WQ_NO_WCFLUSH_WAIT;
+	wqi->context_desc = context_desc;
+	wqi->submit_element_info = ring_tail << WQ_RING_TAIL_SHIFT;
+	GEM_BUG_ON(ring_tail > WQ_RING_TAIL_MAX);
+	wqi->fence_id = fence_id;
+
+	/* Make the update visible to GuC */
+	WRITE_ONCE(desc->tail, (wq_off + wqi_size) & (GUC_WQ_SIZE - 1));
+}
+
+static void guc_reset_wq(struct intel_guc_client *client)
+{
+	struct guc_process_desc *desc = __get_process_desc(client);
+
+	desc->head = 0;
+	desc->tail = 0;
+}
+
+static void guc_ring_doorbell(struct intel_guc_client *client)
+{
+	struct guc_doorbell_info *db;
+	u32 cookie;
+
+	lockdep_assert_held(&client->wq_lock);
+
+	/* pointer of current doorbell cacheline */
+	db = __get_doorbell(client);
+
+	/*
+	 * We're not expecting the doorbell cookie to change behind our back,
+	 * we also need to treat 0 as a reserved value.
+	 */
+	cookie = READ_ONCE(db->cookie);
+	WARN_ON_ONCE(xchg(&db->cookie, cookie + 1 ?: cookie + 2) != cookie);
+
+	/* XXX: doorbell was lost and need to acquire it again */
+	GEM_BUG_ON(db->db_status != GUC_DOORBELL_ENABLED);
+}
+
+static void guc_add_request(struct intel_guc *guc,
+			    struct drm_i915_gem_request *rq)
+{
+	struct intel_guc_client *client = guc->execbuf_client;
+	struct intel_engine_cs *engine = rq->engine;
+	u32 ctx_desc = lower_32_bits(intel_lr_context_descriptor(rq->ctx,
+								 engine));
+	u32 ring_tail = intel_ring_set_tail(rq->ring, rq->tail) / sizeof(u64);
+
+	spin_lock(&client->wq_lock);
+
+	guc_wq_item_append(client, engine->guc_id, ctx_desc,
+			   ring_tail, rq->global_seqno);
+	guc_ring_doorbell(client);
+
+	client->submissions[engine->id] += 1;
+
+	spin_unlock(&client->wq_lock);
+}
+
+/*
+ * When we're doing submissions using regular execlists backend, writing to
+ * ELSP from CPU side is enough to make sure that writes to ringbuffer pages
+ * pinned in mappable aperture portion of GGTT are visible to command streamer.
+ * Writes done by GuC on our behalf are not guaranteeing such ordering,
+ * therefore, to ensure the flush, we're issuing a POSTING READ.
+ */
+static void flush_ggtt_writes(struct i915_vma *vma)
+{
+	struct drm_i915_private *dev_priv = to_i915(vma->obj->base.dev);
+
+	if (i915_vma_is_map_and_fenceable(vma))
+		POSTING_READ_FW(GUC_STATUS);
+}
+
+#define GUC_PREEMPT_FINISHED 0x1
+#define GUC_PREEMPT_BREADCRUMB_DWORDS 0x8
+static void inject_preempt_context(struct work_struct *work)
+{
+	struct guc_preempt_work *preempt_work =
+		container_of(work, typeof(*preempt_work), work);
+	struct intel_engine_cs *engine = preempt_work->engine;
+	struct intel_guc *guc = container_of(preempt_work, typeof(*guc),
+					     preempt_work[engine->id]);
+	struct intel_guc_client *client = guc->preempt_client;
+	struct guc_stage_desc *stage_desc = __get_stage_desc(client);
+	struct intel_ring *ring = client->owner->engine[engine->id].ring;
+	u32 ctx_desc = lower_32_bits(intel_lr_context_descriptor(client->owner,
+								 engine));
+	u32 *cs = ring->vaddr + ring->tail;
+	u32 data[7];
+
+	if (engine->id == RCS) {
+		cs = gen8_emit_ggtt_write_rcs(cs, GUC_PREEMPT_FINISHED,
+				intel_hws_preempt_done_address(engine));
+	} else {
+		cs = gen8_emit_ggtt_write(cs, GUC_PREEMPT_FINISHED,
+				intel_hws_preempt_done_address(engine));
+		*cs++ = MI_NOOP;
+		*cs++ = MI_NOOP;
+	}
+	*cs++ = MI_USER_INTERRUPT;
+	*cs++ = MI_NOOP;
+
+	GEM_BUG_ON(!IS_ALIGNED(ring->size,
+			       GUC_PREEMPT_BREADCRUMB_DWORDS * sizeof(u32)));
+	GEM_BUG_ON((void *)cs - (ring->vaddr + ring->tail) !=
+		   GUC_PREEMPT_BREADCRUMB_DWORDS * sizeof(u32));
+
+	ring->tail += GUC_PREEMPT_BREADCRUMB_DWORDS * sizeof(u32);
+	ring->tail &= (ring->size - 1);
+
+	flush_ggtt_writes(ring->vma);
+
+	spin_lock_irq(&client->wq_lock);
+	guc_wq_item_append(client, engine->guc_id, ctx_desc,
+			   ring->tail / sizeof(u64), 0);
+	spin_unlock_irq(&client->wq_lock);
+
+	/*
+	 * If GuC firmware performs an engine reset while that engine had
+	 * a preemption pending, it will set the terminated attribute bit
+	 * on our preemption stage descriptor. GuC firmware retains all
+	 * pending work items for a high-priority GuC client, unlike the
+	 * normal-priority GuC client where work items are dropped. It
+	 * wants to make sure the preempt-to-idle work doesn't run when
+	 * scheduling resumes, and uses this bit to inform its scheduler
+	 * and presumably us as well. Our job is to clear it for the next
+	 * preemption after reset, otherwise that and future preemptions
+	 * will never complete. We'll just clear it every time.
+	 */
+	stage_desc->attribute &= ~GUC_STAGE_DESC_ATTR_TERMINATED;
+
+	data[0] = INTEL_GUC_ACTION_REQUEST_PREEMPTION;
+	data[1] = client->stage_id;
+	data[2] = INTEL_GUC_PREEMPT_OPTION_DROP_WORK_Q |
+		  INTEL_GUC_PREEMPT_OPTION_DROP_SUBMIT_Q;
+	data[3] = engine->guc_id;
+	data[4] = guc->execbuf_client->priority;
+	data[5] = guc->execbuf_client->stage_id;
+	data[6] = guc_ggtt_offset(guc->shared_data);
+
+	if (WARN_ON(intel_guc_send(guc, data, ARRAY_SIZE(data)))) {
+		execlists_clear_active(&engine->execlists,
+				       EXECLISTS_ACTIVE_PREEMPT);
+		tasklet_schedule(&engine->execlists.tasklet);
+	}
+}
+
+/*
+ * We're using user interrupt and HWSP value to mark that preemption has
+ * finished and GPU is idle. Normally, we could unwind and continue similar to
+ * execlists submission path. Unfortunately, with GuC we also need to wait for
+ * it to finish its own postprocessing, before attempting to submit. Otherwise
+ * GuC may silently ignore our submissions, and thus we risk losing request at
+ * best, executing out-of-order and causing kernel panic at worst.
+ */
+#define GUC_PREEMPT_POSTPROCESS_DELAY_MS 10
+static void wait_for_guc_preempt_report(struct intel_engine_cs *engine)
+{
+	struct intel_guc *guc = &engine->i915->guc;
+	struct guc_shared_ctx_data *data = guc->shared_data_vaddr;
+	struct guc_ctx_report *report =
+		&data->preempt_ctx_report[engine->guc_id];
+
+	WARN_ON(wait_for_atomic(report->report_return_status ==
+				INTEL_GUC_REPORT_STATUS_COMPLETE,
+				GUC_PREEMPT_POSTPROCESS_DELAY_MS));
+	/*
+	 * GuC is expecting that we're also going to clear the affected context
+	 * counter, let's also reset the return status to not depend on GuC
+	 * resetting it after recieving another preempt action
+	 */
+	report->affected_count = 0;
+	report->report_return_status = INTEL_GUC_REPORT_STATUS_UNKNOWN;
+}
+
+/**
+ * guc_submit() - Submit commands through GuC
+ * @engine: engine associated with the commands
+ *
+ * The only error here arises if the doorbell hardware isn't functioning
+ * as expected, which really shouln't happen.
+ */
+static void guc_submit(struct intel_engine_cs *engine)
+{
+	struct intel_guc *guc = &engine->i915->guc;
+	struct intel_engine_execlists * const execlists = &engine->execlists;
+	struct execlist_port *port = execlists->port;
+	unsigned int n;
+
+	for (n = 0; n < execlists_num_ports(execlists); n++) {
+		struct drm_i915_gem_request *rq;
+		unsigned int count;
+
+		rq = port_unpack(&port[n], &count);
+		if (rq && count == 0) {
+			port_set(&port[n], port_pack(rq, ++count));
+
+			flush_ggtt_writes(rq->ring->vma);
+
+			guc_add_request(guc, rq);
+		}
+	}
+}
+
+static void port_assign(struct execlist_port *port,
+			struct drm_i915_gem_request *rq)
+{
+	GEM_BUG_ON(port_isset(port));
+
+	port_set(port, i915_gem_request_get(rq));
+}
+
+static void guc_dequeue(struct intel_engine_cs *engine)
+{
+	struct intel_engine_execlists * const execlists = &engine->execlists;
+	struct execlist_port *port = execlists->port;
+	struct drm_i915_gem_request *last = NULL;
+	const struct execlist_port * const last_port =
+		&execlists->port[execlists->port_mask];
+	bool submit = false;
+	struct rb_node *rb;
+
+	spin_lock_irq(&engine->timeline->lock);
+	rb = execlists->first;
+	GEM_BUG_ON(rb_first(&execlists->queue) != rb);
+
+	if (!rb)
+		goto unlock;
+
+	if (port_isset(port)) {
+		if (HAS_LOGICAL_RING_PREEMPTION(engine->i915)) {
+			struct guc_preempt_work *preempt_work =
+				&engine->i915->guc.preempt_work[engine->id];
+
+			if (rb_entry(rb, struct i915_priolist, node)->priority >
+			    max(port_request(port)->priotree.priority, 0)) {
+				execlists_set_active(execlists,
+						     EXECLISTS_ACTIVE_PREEMPT);
+				queue_work(engine->i915->guc.preempt_wq,
+					   &preempt_work->work);
+				goto unlock;
+			}
+		}
+
+		port++;
+		if (port_isset(port))
+			goto unlock;
+	}
+	GEM_BUG_ON(port_isset(port));
+
+	do {
+		struct i915_priolist *p = rb_entry(rb, typeof(*p), node);
+		struct drm_i915_gem_request *rq, *rn;
+
+		list_for_each_entry_safe(rq, rn, &p->requests, priotree.link) {
+			if (last && rq->ctx != last->ctx) {
+				if (port == last_port) {
+					__list_del_many(&p->requests,
+							&rq->priotree.link);
+					goto done;
+				}
+
+				if (submit)
+					port_assign(port, last);
+				port++;
+			}
+
+			INIT_LIST_HEAD(&rq->priotree.link);
+
+			__i915_gem_request_submit(rq);
+			trace_i915_gem_request_in(rq,
+						  port_index(port, execlists));
+			last = rq;
+			submit = true;
+		}
+
+		rb = rb_next(rb);
+		rb_erase(&p->node, &execlists->queue);
+		INIT_LIST_HEAD(&p->requests);
+		if (p->priority != I915_PRIORITY_NORMAL)
+			kmem_cache_free(engine->i915->priorities, p);
+	} while (rb);
+done:
+	execlists->first = rb;
+	if (submit) {
+		port_assign(port, last);
+		execlists_set_active(execlists, EXECLISTS_ACTIVE_USER);
+		guc_submit(engine);
+	}
+unlock:
+	spin_unlock_irq(&engine->timeline->lock);
+}
+
+static void guc_submission_tasklet(unsigned long data)
+{
+	struct intel_engine_cs * const engine = (struct intel_engine_cs *)data;
+	struct intel_engine_execlists * const execlists = &engine->execlists;
+	struct execlist_port *port = execlists->port;
+	struct drm_i915_gem_request *rq;
+
+	rq = port_request(&port[0]);
+	while (rq && i915_gem_request_completed(rq)) {
+		trace_i915_gem_request_out(rq);
+		i915_gem_request_put(rq);
+
+		execlists_port_complete(execlists, port);
+
+		rq = port_request(&port[0]);
+	}
+	if (!rq)
+		execlists_clear_active(execlists, EXECLISTS_ACTIVE_USER);
+
+	if (execlists_is_active(execlists, EXECLISTS_ACTIVE_PREEMPT) &&
+	    intel_read_status_page(engine, I915_GEM_HWS_PREEMPT_INDEX) ==
+	    GUC_PREEMPT_FINISHED) {
+		execlists_cancel_port_requests(&engine->execlists);
+		execlists_unwind_incomplete_requests(execlists);
+
+		wait_for_guc_preempt_report(engine);
+
+		execlists_clear_active(execlists, EXECLISTS_ACTIVE_PREEMPT);
+		intel_write_status_page(engine, I915_GEM_HWS_PREEMPT_INDEX, 0);
+	}
+
+	if (!execlists_is_active(execlists, EXECLISTS_ACTIVE_PREEMPT))
+		guc_dequeue(engine);
+}
+
+/*
+ * Everything below here is concerned with setup & teardown, and is
+ * therefore not part of the somewhat time-critical batch-submission
+ * path of guc_submit() above.
+ */
+
+/* Check that a doorbell register is in the expected state */
+static bool doorbell_ok(struct intel_guc *guc, u16 db_id)
+{
+	struct drm_i915_private *dev_priv = guc_to_i915(guc);
+	u32 drbregl;
+	bool valid;
+
+	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 has unexpected state (0x%x): valid=%s\n",
+			 db_id, drbregl, yesno(valid));
+
+	return false;
+}
+
+static bool guc_verify_doorbells(struct intel_guc *guc)
+{
+	u16 db_id;
+
+	for (db_id = 0; db_id < GUC_NUM_DOORBELLS; ++db_id)
+		if (!doorbell_ok(guc, db_id))
+			return false;
+
+	return true;
+}
+
+static int guc_clients_doorbell_init(struct intel_guc *guc)
+{
+	int ret;
+
+	ret = create_doorbell(guc->execbuf_client);
+	if (ret)
+		return ret;
+
+	ret = create_doorbell(guc->preempt_client);
+	if (ret) {
+		destroy_doorbell(guc->execbuf_client);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void guc_clients_doorbell_fini(struct intel_guc *guc)
+{
+	/*
+	 * By the time we're here, GuC has already been reset.
+	 * Instead of trying (in vain) to communicate with it, let's just
+	 * cleanup the doorbell HW and our internal state.
+	 */
+	__destroy_doorbell(guc->preempt_client);
+	__update_doorbell_desc(guc->preempt_client, GUC_DOORBELL_INVALID);
+	__destroy_doorbell(guc->execbuf_client);
+	__update_doorbell_desc(guc->execbuf_client, GUC_DOORBELL_INVALID);
+}
+
+/**
+ * guc_client_alloc() - Allocate an intel_guc_client
+ * @dev_priv:	driver private data structure
+ * @engines:	The set of engines to enable for this client
+ * @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.
+ * @ctx:	the context that owns the client (we use the default render
+ *		context)
+ *
+ * Return:	An intel_guc_client object if success, else NULL.
+ */
+static struct intel_guc_client *
+guc_client_alloc(struct drm_i915_private *dev_priv,
+		 u32 engines,
+		 u32 priority,
+		 struct i915_gem_context *ctx)
+{
+	struct intel_guc_client *client;
+	struct intel_guc *guc = &dev_priv->guc;
+	struct i915_vma *vma;
+	void *vaddr;
+	int ret;
+
+	client = kzalloc(sizeof(*client), GFP_KERNEL);
+	if (!client)
+		return ERR_PTR(-ENOMEM);
+
+	client->guc = guc;
+	client->owner = ctx;
+	client->engines = engines;
+	client->priority = priority;
+	client->doorbell_id = GUC_DOORBELL_INVALID;
+	spin_lock_init(&client->wq_lock);
+
+	ret = ida_simple_get(&guc->stage_ids, 0, GUC_MAX_STAGE_DESCRIPTORS,
+			     GFP_KERNEL);
+	if (ret < 0)
+		goto err_client;
+
+	client->stage_id = 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)) {
+		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)) {
+		ret = PTR_ERR(vaddr);
+		goto err_vma;
+	}
+	client->vaddr = vaddr;
+
+	client->doorbell_offset = __select_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);
+
+	guc_proc_desc_init(guc, client);
+	guc_stage_desc_init(guc, client);
+
+	ret = reserve_doorbell(client);
+	if (ret)
+		goto err_vaddr;
+
+	DRM_DEBUG_DRIVER("new priority %u client %p for engine(s) 0x%x: stage_id %u\n",
+			 priority, client, client->engines, client->stage_id);
+	DRM_DEBUG_DRIVER("doorbell id %u, cacheline offset 0x%lx\n",
+			 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:
+	ida_simple_remove(&guc->stage_ids, client->stage_id);
+err_client:
+	kfree(client);
+	return ERR_PTR(ret);
+}
+
+static void guc_client_free(struct intel_guc_client *client)
+{
+	unreserve_doorbell(client);
+	guc_stage_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->stage_ids, client->stage_id);
+	kfree(client);
+}
+
+static int guc_clients_create(struct intel_guc *guc)
+{
+	struct drm_i915_private *dev_priv = guc_to_i915(guc);
+	struct intel_guc_client *client;
+
+	GEM_BUG_ON(guc->execbuf_client);
+	GEM_BUG_ON(guc->preempt_client);
+
+	client = guc_client_alloc(dev_priv,
+				  INTEL_INFO(dev_priv)->ring_mask,
+				  GUC_CLIENT_PRIORITY_KMD_NORMAL,
+				  dev_priv->kernel_context);
+	if (IS_ERR(client)) {
+		DRM_ERROR("Failed to create GuC client for submission!\n");
+		return PTR_ERR(client);
+	}
+	guc->execbuf_client = client;
+
+	client = guc_client_alloc(dev_priv,
+				  INTEL_INFO(dev_priv)->ring_mask,
+				  GUC_CLIENT_PRIORITY_KMD_HIGH,
+				  dev_priv->preempt_context);
+	if (IS_ERR(client)) {
+		DRM_ERROR("Failed to create GuC client for preemption!\n");
+		guc_client_free(guc->execbuf_client);
+		guc->execbuf_client = NULL;
+		return PTR_ERR(client);
+	}
+	guc->preempt_client = client;
+
+	return 0;
+}
+
+static void guc_clients_destroy(struct intel_guc *guc)
+{
+	struct intel_guc_client *client;
+
+	client = fetch_and_zero(&guc->execbuf_client);
+	guc_client_free(client);
+
+	client = fetch_and_zero(&guc->preempt_client);
+	guc_client_free(client);
+}
+
+static void guc_policy_init(struct guc_policy *policy)
+{
+	policy->execution_quantum = POLICY_DEFAULT_EXECUTION_QUANTUM_US;
+	policy->preemption_time = POLICY_DEFAULT_PREEMPTION_TIME_US;
+	policy->fault_time = POLICY_DEFAULT_FAULT_TIME_US;
+	policy->policy_flags = 0;
+}
+
+static void guc_policies_init(struct guc_policies *policies)
+{
+	struct guc_policy *policy;
+	u32 p, i;
+
+	policies->dpc_promote_time = POLICY_DEFAULT_DPC_PROMOTE_TIME_US;
+	policies->max_num_work_items = POLICY_MAX_NUM_WI;
+
+	for (p = 0; p < GUC_CLIENT_PRIORITY_NUM; p++) {
+		for (i = GUC_RENDER_ENGINE; i < GUC_MAX_ENGINES_NUM; i++) {
+			policy = &policies->policy[p][i];
+
+			guc_policy_init(policy);
+		}
+	}
+
+	policies->is_valid = 1;
+}
+
+/*
+ * The first 80 dwords of the register state context, containing the
+ * execlists and ppgtt registers.
+ */
+#define LR_HW_CONTEXT_SIZE	(80 * sizeof(u32))
+
+static int guc_ads_create(struct intel_guc *guc)
+{
+	struct drm_i915_private *dev_priv = guc_to_i915(guc);
+	struct i915_vma *vma;
+	struct page *page;
+	/* The ads obj includes the struct itself and buffers passed to GuC */
+	struct {
+		struct guc_ads ads;
+		struct guc_policies policies;
+		struct guc_mmio_reg_state reg_state;
+		u8 reg_state_buffer[GUC_S3_SAVE_SPACE_PAGES * PAGE_SIZE];
+	} __packed *blob;
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+	const u32 skipped_offset = LRC_HEADER_PAGES * PAGE_SIZE;
+	const u32 skipped_size = LRC_PPHWSP_SZ * PAGE_SIZE + LR_HW_CONTEXT_SIZE;
+	u32 base;
+
+	GEM_BUG_ON(guc->ads_vma);
+
+	vma = intel_guc_allocate_vma(guc, PAGE_ALIGN(sizeof(*blob)));
+	if (IS_ERR(vma))
+		return PTR_ERR(vma);
+
+	guc->ads_vma = vma;
+
+	page = i915_vma_first_page(vma);
+	blob = kmap(page);
+
+	/* GuC scheduling policies */
+	guc_policies_init(&blob->policies);
+
+	/* MMIO reg state */
+	for_each_engine(engine, dev_priv, id) {
+		blob->reg_state.white_list[engine->guc_id].mmio_start =
+			engine->mmio_base + GUC_MMIO_WHITE_LIST_START;
+
+		/* Nothing to be saved or restored for now. */
+		blob->reg_state.white_list[engine->guc_id].count = 0;
+	}
+
+	/*
+	 * The GuC requires a "Golden Context" when it reinitialises
+	 * engines after a reset. Here we use the Render ring default
+	 * context, which must already exist and be pinned in the GGTT,
+	 * so its address won't change after we've told the GuC where
+	 * to find it. Note that we have to skip our header (1 page),
+	 * because our GuC shared data is there.
+	 */
+	blob->ads.golden_context_lrca =
+		guc_ggtt_offset(dev_priv->kernel_context->engine[RCS].state) +
+		skipped_offset;
+
+	/*
+	 * The GuC expects us to exclude the portion of the context image that
+	 * it skips from the size it is to read. It starts reading from after
+	 * the execlist context (so skipping the first page [PPHWSP] and 80
+	 * dwords). Weird guc is weird.
+	 */
+	for_each_engine(engine, dev_priv, id)
+		blob->ads.eng_state_size[engine->guc_id] =
+			engine->context_size - skipped_size;
+
+	base = guc_ggtt_offset(vma);
+	blob->ads.scheduler_policies = base + ptr_offset(blob, policies);
+	blob->ads.reg_state_buffer = base + ptr_offset(blob, reg_state_buffer);
+	blob->ads.reg_state_addr = base + ptr_offset(blob, reg_state);
+
+	kunmap(page);
+
+	return 0;
+}
+
+static void guc_ads_destroy(struct intel_guc *guc)
+{
+	i915_vma_unpin_and_release(&guc->ads_vma);
+}
+
+/*
+ * Set up the memory resources to be shared with the GuC (via the GGTT)
+ * at firmware loading time.
+ */
+int intel_guc_submission_init(struct intel_guc *guc)
+{
+	struct drm_i915_private *dev_priv = guc_to_i915(guc);
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+	int ret;
+
+	if (guc->stage_desc_pool)
+		return 0;
+
+	ret = guc_stage_desc_pool_create(guc);
+	if (ret)
+		return ret;
+	/*
+	 * Keep static analysers happy, let them know that we allocated the
+	 * vma after testing that it didn't exist earlier.
+	 */
+	GEM_BUG_ON(!guc->stage_desc_pool);
+
+	ret = intel_guc_log_create(guc);
+	if (ret < 0)
+		goto err_stage_desc_pool;
+
+	ret = guc_ads_create(guc);
+	if (ret < 0)
+		goto err_log;
+	GEM_BUG_ON(!guc->ads_vma);
+
+	WARN_ON(!guc_verify_doorbells(guc));
+	ret = guc_clients_create(guc);
+	if (ret)
+		return ret;
+
+	for_each_engine(engine, dev_priv, id) {
+		guc->preempt_work[id].engine = engine;
+		INIT_WORK(&guc->preempt_work[id].work, inject_preempt_context);
+	}
+
+	return 0;
+
+err_log:
+	intel_guc_log_destroy(guc);
+err_stage_desc_pool:
+	guc_stage_desc_pool_destroy(guc);
+	return ret;
+}
+
+void intel_guc_submission_fini(struct intel_guc *guc)
+{
+	struct drm_i915_private *dev_priv = guc_to_i915(guc);
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+
+	for_each_engine(engine, dev_priv, id)
+		cancel_work_sync(&guc->preempt_work[id].work);
+
+	guc_clients_destroy(guc);
+	WARN_ON(!guc_verify_doorbells(guc));
+
+	guc_ads_destroy(guc);
+	intel_guc_log_destroy(guc);
+	guc_stage_desc_pool_destroy(guc);
+}
+
+static void guc_interrupts_capture(struct drm_i915_private *dev_priv)
+{
+	struct intel_rps *rps = &dev_priv->gt_pm.rps;
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+	int irqs;
+
+	/* tell all command streamers to forward interrupts (but not vblank)
+	 * to GuC
+	 */
+	irqs = _MASKED_BIT_ENABLE(GFX_INTERRUPT_STEERING);
+	for_each_engine(engine, dev_priv, id)
+		I915_WRITE(RING_MODE_GEN7(engine), irqs);
+
+	/* route USER_INTERRUPT to Host, all others are sent to GuC. */
+	irqs = GT_RENDER_USER_INTERRUPT << GEN8_RCS_IRQ_SHIFT |
+	       GT_RENDER_USER_INTERRUPT << GEN8_BCS_IRQ_SHIFT;
+	/* These three registers have the same bit definitions */
+	I915_WRITE(GUC_BCS_RCS_IER, ~irqs);
+	I915_WRITE(GUC_VCS2_VCS1_IER, ~irqs);
+	I915_WRITE(GUC_WD_VECS_IER, ~irqs);
+
+	/*
+	 * The REDIRECT_TO_GUC bit of the PMINTRMSK register directs all
+	 * (unmasked) PM interrupts to the GuC. All other bits of this
+	 * register *disable* generation of a specific interrupt.
+	 *
+	 * 'pm_intrmsk_mbz' indicates bits that are NOT to be set when
+	 * writing to the PM interrupt mask register, i.e. interrupts
+	 * that must not be disabled.
+	 *
+	 * If the GuC is handling these interrupts, then we must not let
+	 * the PM code disable ANY interrupt that the GuC is expecting.
+	 * So for each ENABLED (0) bit in this register, we must SET the
+	 * bit in pm_intrmsk_mbz so that it's left enabled for the GuC.
+	 * GuC needs ARAT expired interrupt unmasked hence it is set in
+	 * pm_intrmsk_mbz.
+	 *
+	 * Here we CLEAR REDIRECT_TO_GUC bit in pm_intrmsk_mbz, which will
+	 * result in the register bit being left SET!
+	 */
+	rps->pm_intrmsk_mbz |= ARAT_EXPIRED_INTRMSK;
+	rps->pm_intrmsk_mbz &= ~GEN8_PMINTR_DISABLE_REDIRECT_TO_GUC;
+}
+
+static void guc_interrupts_release(struct drm_i915_private *dev_priv)
+{
+	struct intel_rps *rps = &dev_priv->gt_pm.rps;
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+	int irqs;
+
+	/*
+	 * tell all command streamers NOT to forward interrupts or vblank
+	 * to GuC.
+	 */
+	irqs = _MASKED_FIELD(GFX_FORWARD_VBLANK_MASK, GFX_FORWARD_VBLANK_NEVER);
+	irqs |= _MASKED_BIT_DISABLE(GFX_INTERRUPT_STEERING);
+	for_each_engine(engine, dev_priv, id)
+		I915_WRITE(RING_MODE_GEN7(engine), irqs);
+
+	/* route all GT interrupts to the host */
+	I915_WRITE(GUC_BCS_RCS_IER, 0);
+	I915_WRITE(GUC_VCS2_VCS1_IER, 0);
+	I915_WRITE(GUC_WD_VECS_IER, 0);
+
+	rps->pm_intrmsk_mbz |= GEN8_PMINTR_DISABLE_REDIRECT_TO_GUC;
+	rps->pm_intrmsk_mbz &= ~ARAT_EXPIRED_INTRMSK;
+}
+
+static void guc_submission_park(struct intel_engine_cs *engine)
+{
+	intel_engine_unpin_breadcrumbs_irq(engine);
+}
+
+static void guc_submission_unpark(struct intel_engine_cs *engine)
+{
+	intel_engine_pin_breadcrumbs_irq(engine);
+}
+
+int intel_guc_submission_enable(struct intel_guc *guc)
+{
+	struct drm_i915_private *dev_priv = guc_to_i915(guc);
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+	int err;
+
+	/*
+	 * We're using GuC work items for submitting work through GuC. Since
+	 * we're coalescing multiple requests from a single context into a
+	 * single work item prior to assigning it to execlist_port, we can
+	 * never have more work items than the total number of ports (for all
+	 * engines). The GuC firmware is controlling the HEAD of work queue,
+	 * and it is guaranteed that it will remove the work item from the
+	 * queue before our request is completed.
+	 */
+	BUILD_BUG_ON(ARRAY_SIZE(engine->execlists.port) *
+		     sizeof(struct guc_wq_item) *
+		     I915_NUM_ENGINES > GUC_WQ_SIZE);
+
+	GEM_BUG_ON(!guc->execbuf_client);
+
+	guc_reset_wq(guc->execbuf_client);
+	guc_reset_wq(guc->preempt_client);
+
+	err = intel_guc_sample_forcewake(guc);
+	if (err)
+		return err;
+
+	err = guc_clients_doorbell_init(guc);
+	if (err)
+		return err;
+
+	/* Take over from manual control of ELSP (execlists) */
+	guc_interrupts_capture(dev_priv);
+
+	for_each_engine(engine, dev_priv, id) {
+		struct intel_engine_execlists * const execlists =
+			&engine->execlists;
+
+		execlists->tasklet.func = guc_submission_tasklet;
+		engine->park = guc_submission_park;
+		engine->unpark = guc_submission_unpark;
+
+		engine->flags &= ~I915_ENGINE_SUPPORTS_STATS;
+	}
+
+	return 0;
+}
+
+void intel_guc_submission_disable(struct intel_guc *guc)
+{
+	struct drm_i915_private *dev_priv = guc_to_i915(guc);
+
+	GEM_BUG_ON(dev_priv->gt.awake); /* GT should be parked first */
+
+	guc_interrupts_release(dev_priv);
+	guc_clients_doorbell_fini(guc);
+
+	/* Revert back to manual ELSP submission */
+	intel_engines_reset_default_submission(dev_priv);
+}
+
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
+#include "selftests/intel_guc.c"
+#endif