intel_engine_cs.c 52.9 KB
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/*
 * Copyright © 2016 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.
 *
 */

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#include <drm/drm_print.h>

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#include "i915_drv.h"
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#include "i915_vgpu.h"
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#include "intel_ringbuffer.h"
#include "intel_lrc.h"

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/* Haswell does have the CXT_SIZE register however it does not appear to be
 * valid. Now, docs explain in dwords what is in the context object. The full
 * size is 70720 bytes, however, the power context and execlist context will
 * never be saved (power context is stored elsewhere, and execlists don't work
 * on HSW) - so the final size, including the extra state required for the
 * Resource Streamer, is 66944 bytes, which rounds to 17 pages.
 */
#define HSW_CXT_TOTAL_SIZE		(17 * PAGE_SIZE)
/* Same as Haswell, but 72064 bytes now. */
#define GEN8_CXT_TOTAL_SIZE		(18 * PAGE_SIZE)

#define GEN8_LR_CONTEXT_RENDER_SIZE	(20 * PAGE_SIZE)
#define GEN9_LR_CONTEXT_RENDER_SIZE	(22 * PAGE_SIZE)
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#define GEN10_LR_CONTEXT_RENDER_SIZE	(18 * PAGE_SIZE)
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#define GEN8_LR_CONTEXT_OTHER_SIZE	( 2 * PAGE_SIZE)

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struct engine_class_info {
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	const char *name;
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	int (*init_legacy)(struct intel_engine_cs *engine);
	int (*init_execlists)(struct intel_engine_cs *engine);
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	u8 uabi_class;
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};

static const struct engine_class_info intel_engine_classes[] = {
	[RENDER_CLASS] = {
		.name = "rcs",
		.init_execlists = logical_render_ring_init,
		.init_legacy = intel_init_render_ring_buffer,
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		.uabi_class = I915_ENGINE_CLASS_RENDER,
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	},
	[COPY_ENGINE_CLASS] = {
		.name = "bcs",
		.init_execlists = logical_xcs_ring_init,
		.init_legacy = intel_init_blt_ring_buffer,
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		.uabi_class = I915_ENGINE_CLASS_COPY,
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	},
	[VIDEO_DECODE_CLASS] = {
		.name = "vcs",
		.init_execlists = logical_xcs_ring_init,
		.init_legacy = intel_init_bsd_ring_buffer,
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		.uabi_class = I915_ENGINE_CLASS_VIDEO,
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	},
	[VIDEO_ENHANCEMENT_CLASS] = {
		.name = "vecs",
		.init_execlists = logical_xcs_ring_init,
		.init_legacy = intel_init_vebox_ring_buffer,
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		.uabi_class = I915_ENGINE_CLASS_VIDEO_ENHANCE,
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	},
};

struct engine_info {
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	unsigned int hw_id;
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	unsigned int uabi_id;
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	u8 class;
	u8 instance;
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	u32 mmio_base;
	unsigned irq_shift;
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};

static const struct engine_info intel_engines[] = {
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	[RCS] = {
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		.hw_id = RCS_HW,
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		.uabi_id = I915_EXEC_RENDER,
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		.class = RENDER_CLASS,
		.instance = 0,
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		.mmio_base = RENDER_RING_BASE,
		.irq_shift = GEN8_RCS_IRQ_SHIFT,
	},
	[BCS] = {
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		.hw_id = BCS_HW,
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		.uabi_id = I915_EXEC_BLT,
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		.class = COPY_ENGINE_CLASS,
		.instance = 0,
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		.mmio_base = BLT_RING_BASE,
		.irq_shift = GEN8_BCS_IRQ_SHIFT,
	},
	[VCS] = {
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		.hw_id = VCS_HW,
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		.uabi_id = I915_EXEC_BSD,
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		.class = VIDEO_DECODE_CLASS,
		.instance = 0,
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		.mmio_base = GEN6_BSD_RING_BASE,
		.irq_shift = GEN8_VCS1_IRQ_SHIFT,
	},
	[VCS2] = {
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		.hw_id = VCS2_HW,
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		.uabi_id = I915_EXEC_BSD,
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		.class = VIDEO_DECODE_CLASS,
		.instance = 1,
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		.mmio_base = GEN8_BSD2_RING_BASE,
		.irq_shift = GEN8_VCS2_IRQ_SHIFT,
	},
	[VECS] = {
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		.hw_id = VECS_HW,
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		.uabi_id = I915_EXEC_VEBOX,
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		.class = VIDEO_ENHANCEMENT_CLASS,
		.instance = 0,
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		.mmio_base = VEBOX_RING_BASE,
		.irq_shift = GEN8_VECS_IRQ_SHIFT,
	},
};

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/**
 * ___intel_engine_context_size() - return the size of the context for an engine
 * @dev_priv: i915 device private
 * @class: engine class
 *
 * Each engine class may require a different amount of space for a context
 * image.
 *
 * Return: size (in bytes) of an engine class specific context image
 *
 * Note: this size includes the HWSP, which is part of the context image
 * in LRC mode, but does not include the "shared data page" used with
 * GuC submission. The caller should account for this if using the GuC.
 */
static u32
__intel_engine_context_size(struct drm_i915_private *dev_priv, u8 class)
{
	u32 cxt_size;

	BUILD_BUG_ON(I915_GTT_PAGE_SIZE != PAGE_SIZE);

	switch (class) {
	case RENDER_CLASS:
		switch (INTEL_GEN(dev_priv)) {
		default:
			MISSING_CASE(INTEL_GEN(dev_priv));
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		case 10:
O
Oscar Mateo 已提交
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			return GEN10_LR_CONTEXT_RENDER_SIZE;
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		case 9:
			return GEN9_LR_CONTEXT_RENDER_SIZE;
		case 8:
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			return i915_modparams.enable_execlists ?
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			       GEN8_LR_CONTEXT_RENDER_SIZE :
			       GEN8_CXT_TOTAL_SIZE;
		case 7:
			if (IS_HASWELL(dev_priv))
				return HSW_CXT_TOTAL_SIZE;

			cxt_size = I915_READ(GEN7_CXT_SIZE);
			return round_up(GEN7_CXT_TOTAL_SIZE(cxt_size) * 64,
					PAGE_SIZE);
		case 6:
			cxt_size = I915_READ(CXT_SIZE);
			return round_up(GEN6_CXT_TOTAL_SIZE(cxt_size) * 64,
					PAGE_SIZE);
		case 5:
		case 4:
		case 3:
		case 2:
		/* For the special day when i810 gets merged. */
		case 1:
			return 0;
		}
		break;
	default:
		MISSING_CASE(class);
	case VIDEO_DECODE_CLASS:
	case VIDEO_ENHANCEMENT_CLASS:
	case COPY_ENGINE_CLASS:
		if (INTEL_GEN(dev_priv) < 8)
			return 0;
		return GEN8_LR_CONTEXT_OTHER_SIZE;
	}
}

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static int
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intel_engine_setup(struct drm_i915_private *dev_priv,
		   enum intel_engine_id id)
{
	const struct engine_info *info = &intel_engines[id];
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	const struct engine_class_info *class_info;
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	struct intel_engine_cs *engine;

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	GEM_BUG_ON(info->class >= ARRAY_SIZE(intel_engine_classes));
	class_info = &intel_engine_classes[info->class];

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	GEM_BUG_ON(dev_priv->engine[id]);
	engine = kzalloc(sizeof(*engine), GFP_KERNEL);
	if (!engine)
		return -ENOMEM;
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	engine->id = id;
	engine->i915 = dev_priv;
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	WARN_ON(snprintf(engine->name, sizeof(engine->name), "%s%u",
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			 class_info->name, info->instance) >=
		sizeof(engine->name));
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	engine->hw_id = engine->guc_id = info->hw_id;
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	engine->mmio_base = info->mmio_base;
	engine->irq_shift = info->irq_shift;
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	engine->class = info->class;
	engine->instance = info->instance;
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	engine->uabi_id = info->uabi_id;
	engine->uabi_class = class_info->uabi_class;

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	engine->context_size = __intel_engine_context_size(dev_priv,
							   engine->class);
	if (WARN_ON(engine->context_size > BIT(20)))
		engine->context_size = 0;

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	/* Nothing to do here, execute in order of dependencies */
	engine->schedule = NULL;

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	ATOMIC_INIT_NOTIFIER_HEAD(&engine->context_status_notifier);

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	dev_priv->engine[id] = engine;
	return 0;
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}

/**
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 * intel_engines_init_mmio() - allocate and prepare the Engine Command Streamers
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 * @dev_priv: i915 device private
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 *
 * Return: non-zero if the initialization failed.
 */
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int intel_engines_init_mmio(struct drm_i915_private *dev_priv)
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{
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	struct intel_device_info *device_info = mkwrite_device_info(dev_priv);
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	const unsigned int ring_mask = INTEL_INFO(dev_priv)->ring_mask;
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	struct intel_engine_cs *engine;
	enum intel_engine_id id;
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	unsigned int mask = 0;
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	unsigned int i;
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	int err;
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	WARN_ON(ring_mask == 0);
	WARN_ON(ring_mask &
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		GENMASK(sizeof(mask) * BITS_PER_BYTE - 1, I915_NUM_ENGINES));

	for (i = 0; i < ARRAY_SIZE(intel_engines); i++) {
		if (!HAS_ENGINE(dev_priv, i))
			continue;

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		err = intel_engine_setup(dev_priv, i);
		if (err)
			goto cleanup;

		mask |= ENGINE_MASK(i);
	}

	/*
	 * Catch failures to update intel_engines table when the new engines
	 * are added to the driver by a warning and disabling the forgotten
	 * engines.
	 */
	if (WARN_ON(mask != ring_mask))
		device_info->ring_mask = mask;

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	/* We always presume we have at least RCS available for later probing */
	if (WARN_ON(!HAS_ENGINE(dev_priv, RCS))) {
		err = -ENODEV;
		goto cleanup;
	}

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	device_info->num_rings = hweight32(mask);

	return 0;

cleanup:
	for_each_engine(engine, dev_priv, id)
		kfree(engine);
	return err;
}

/**
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 * intel_engines_init() - init the Engine Command Streamers
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 * @dev_priv: i915 device private
 *
 * Return: non-zero if the initialization failed.
 */
int intel_engines_init(struct drm_i915_private *dev_priv)
{
	struct intel_engine_cs *engine;
	enum intel_engine_id id, err_id;
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	int err;
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	for_each_engine(engine, dev_priv, id) {
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		const struct engine_class_info *class_info =
			&intel_engine_classes[engine->class];
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		int (*init)(struct intel_engine_cs *engine);

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		if (i915_modparams.enable_execlists)
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			init = class_info->init_execlists;
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		else
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			init = class_info->init_legacy;
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		err = -EINVAL;
		err_id = id;

		if (GEM_WARN_ON(!init))
			goto cleanup;
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		err = init(engine);
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		if (err)
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			goto cleanup;

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		GEM_BUG_ON(!engine->submit_request);
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	}

	return 0;

cleanup:
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	for_each_engine(engine, dev_priv, id) {
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		if (id >= err_id) {
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			kfree(engine);
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			dev_priv->engine[id] = NULL;
		} else {
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			dev_priv->gt.cleanup_engine(engine);
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		}
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	}
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	return err;
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}

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void intel_engine_init_global_seqno(struct intel_engine_cs *engine, u32 seqno)
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{
	struct drm_i915_private *dev_priv = engine->i915;

	/* Our semaphore implementation is strictly monotonic (i.e. we proceed
	 * so long as the semaphore value in the register/page is greater
	 * than the sync value), so whenever we reset the seqno,
	 * so long as we reset the tracking semaphore value to 0, it will
	 * always be before the next request's seqno. If we don't reset
	 * the semaphore value, then when the seqno moves backwards all
	 * future waits will complete instantly (causing rendering corruption).
	 */
	if (IS_GEN6(dev_priv) || IS_GEN7(dev_priv)) {
		I915_WRITE(RING_SYNC_0(engine->mmio_base), 0);
		I915_WRITE(RING_SYNC_1(engine->mmio_base), 0);
		if (HAS_VEBOX(dev_priv))
			I915_WRITE(RING_SYNC_2(engine->mmio_base), 0);
	}
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	if (dev_priv->semaphore) {
		struct page *page = i915_vma_first_page(dev_priv->semaphore);
		void *semaphores;

		/* Semaphores are in noncoherent memory, flush to be safe */
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		semaphores = kmap_atomic(page);
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		memset(semaphores + GEN8_SEMAPHORE_OFFSET(engine->id, 0),
		       0, I915_NUM_ENGINES * gen8_semaphore_seqno_size);
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		drm_clflush_virt_range(semaphores + GEN8_SEMAPHORE_OFFSET(engine->id, 0),
				       I915_NUM_ENGINES * gen8_semaphore_seqno_size);
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		kunmap_atomic(semaphores);
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	}

	intel_write_status_page(engine, I915_GEM_HWS_INDEX, seqno);
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	clear_bit(ENGINE_IRQ_BREADCRUMB, &engine->irq_posted);
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	/* After manually advancing the seqno, fake the interrupt in case
	 * there are any waiters for that seqno.
	 */
	intel_engine_wakeup(engine);
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	GEM_BUG_ON(intel_engine_get_seqno(engine) != seqno);
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}

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static void intel_engine_init_timeline(struct intel_engine_cs *engine)
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{
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	engine->timeline = &engine->i915->gt.global_timeline.engine[engine->id];
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}

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static bool csb_force_mmio(struct drm_i915_private *i915)
{
	/*
	 * IOMMU adds unpredictable latency causing the CSB write (from the
	 * GPU into the HWSP) to only be visible some time after the interrupt
	 * (missed breadcrumb syndrome).
	 */
	if (intel_vtd_active())
		return true;

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	/* Older GVT emulation depends upon intercepting CSB mmio */
	if (intel_vgpu_active(i915) && !intel_vgpu_has_hwsp_emulation(i915))
		return true;

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	return false;
}

static void intel_engine_init_execlist(struct intel_engine_cs *engine)
{
	struct intel_engine_execlists * const execlists = &engine->execlists;

	execlists->csb_use_mmio = csb_force_mmio(engine->i915);

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	execlists->port_mask = 1;
	BUILD_BUG_ON_NOT_POWER_OF_2(execlists_num_ports(execlists));
	GEM_BUG_ON(execlists_num_ports(execlists) > EXECLIST_MAX_PORTS);

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	execlists->queue = RB_ROOT;
	execlists->first = NULL;
}

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/**
 * intel_engines_setup_common - setup engine state not requiring hw access
 * @engine: Engine to setup.
 *
 * Initializes @engine@ structure members shared between legacy and execlists
 * submission modes which do not require hardware access.
 *
 * Typically done early in the submission mode specific engine setup stage.
 */
void intel_engine_setup_common(struct intel_engine_cs *engine)
{
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	intel_engine_init_execlist(engine);
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	intel_engine_init_timeline(engine);
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	intel_engine_init_hangcheck(engine);
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	i915_gem_batch_pool_init(engine, &engine->batch_pool);
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	intel_engine_init_cmd_parser(engine);
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}

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int intel_engine_create_scratch(struct intel_engine_cs *engine, int size)
{
	struct drm_i915_gem_object *obj;
	struct i915_vma *vma;
	int ret;

	WARN_ON(engine->scratch);

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	obj = i915_gem_object_create_stolen(engine->i915, size);
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	if (!obj)
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		obj = i915_gem_object_create_internal(engine->i915, size);
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	if (IS_ERR(obj)) {
		DRM_ERROR("Failed to allocate scratch page\n");
		return PTR_ERR(obj);
	}

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	vma = i915_vma_instance(obj, &engine->i915->ggtt.base, NULL);
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	if (IS_ERR(vma)) {
		ret = PTR_ERR(vma);
		goto err_unref;
	}

	ret = i915_vma_pin(vma, 0, 4096, PIN_GLOBAL | PIN_HIGH);
	if (ret)
		goto err_unref;

	engine->scratch = vma;
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	DRM_DEBUG_DRIVER("%s pipe control offset: 0x%08x\n",
			 engine->name, i915_ggtt_offset(vma));
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	return 0;

err_unref:
	i915_gem_object_put(obj);
	return ret;
}

static void intel_engine_cleanup_scratch(struct intel_engine_cs *engine)
{
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	i915_vma_unpin_and_release(&engine->scratch);
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}

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static void cleanup_phys_status_page(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;

	if (!dev_priv->status_page_dmah)
		return;

	drm_pci_free(&dev_priv->drm, dev_priv->status_page_dmah);
	engine->status_page.page_addr = NULL;
}

static void cleanup_status_page(struct intel_engine_cs *engine)
{
	struct i915_vma *vma;
	struct drm_i915_gem_object *obj;

	vma = fetch_and_zero(&engine->status_page.vma);
	if (!vma)
		return;

	obj = vma->obj;

	i915_vma_unpin(vma);
	i915_vma_close(vma);

	i915_gem_object_unpin_map(obj);
	__i915_gem_object_release_unless_active(obj);
}

static int init_status_page(struct intel_engine_cs *engine)
{
	struct drm_i915_gem_object *obj;
	struct i915_vma *vma;
	unsigned int flags;
	void *vaddr;
	int ret;

	obj = i915_gem_object_create_internal(engine->i915, PAGE_SIZE);
	if (IS_ERR(obj)) {
		DRM_ERROR("Failed to allocate status page\n");
		return PTR_ERR(obj);
	}

	ret = i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);
	if (ret)
		goto err;

	vma = i915_vma_instance(obj, &engine->i915->ggtt.base, NULL);
	if (IS_ERR(vma)) {
		ret = PTR_ERR(vma);
		goto err;
	}

	flags = PIN_GLOBAL;
	if (!HAS_LLC(engine->i915))
		/* On g33, we cannot place HWS above 256MiB, so
		 * restrict its pinning to the low mappable arena.
		 * Though this restriction is not documented for
		 * gen4, gen5, or byt, they also behave similarly
		 * and hang if the HWS is placed at the top of the
		 * GTT. To generalise, it appears that all !llc
		 * platforms have issues with us placing the HWS
		 * above the mappable region (even though we never
		 * actually map it).
		 */
		flags |= PIN_MAPPABLE;
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	else
		flags |= PIN_HIGH;
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	ret = i915_vma_pin(vma, 0, 4096, flags);
	if (ret)
		goto err;

	vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB);
	if (IS_ERR(vaddr)) {
		ret = PTR_ERR(vaddr);
		goto err_unpin;
	}

	engine->status_page.vma = vma;
	engine->status_page.ggtt_offset = i915_ggtt_offset(vma);
	engine->status_page.page_addr = memset(vaddr, 0, PAGE_SIZE);

	DRM_DEBUG_DRIVER("%s hws offset: 0x%08x\n",
			 engine->name, i915_ggtt_offset(vma));
	return 0;

err_unpin:
	i915_vma_unpin(vma);
err:
	i915_gem_object_put(obj);
	return ret;
}

static int init_phys_status_page(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;

	GEM_BUG_ON(engine->id != RCS);

	dev_priv->status_page_dmah =
		drm_pci_alloc(&dev_priv->drm, PAGE_SIZE, PAGE_SIZE);
	if (!dev_priv->status_page_dmah)
		return -ENOMEM;

	engine->status_page.page_addr = dev_priv->status_page_dmah->vaddr;
	memset(engine->status_page.page_addr, 0, PAGE_SIZE);

	return 0;
}

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/**
 * intel_engines_init_common - initialize cengine state which might require hw access
 * @engine: Engine to initialize.
 *
 * Initializes @engine@ structure members shared between legacy and execlists
 * submission modes which do require hardware access.
 *
 * Typcally done at later stages of submission mode specific engine setup.
 *
 * Returns zero on success or an error code on failure.
 */
int intel_engine_init_common(struct intel_engine_cs *engine)
{
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	struct intel_ring *ring;
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	int ret;

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	engine->set_default_submission(engine);

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	/* We may need to do things with the shrinker which
	 * require us to immediately switch back to the default
	 * context. This can cause a problem as pinning the
	 * default context also requires GTT space which may not
	 * be available. To avoid this we always pin the default
	 * context.
	 */
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	ring = engine->context_pin(engine, engine->i915->kernel_context);
	if (IS_ERR(ring))
		return PTR_ERR(ring);
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	/*
	 * Similarly the preempt context must always be available so that
	 * we can interrupt the engine at any time.
	 */
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	if (HAS_LOGICAL_RING_PREEMPTION(engine->i915)) {
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		ring = engine->context_pin(engine,
					   engine->i915->preempt_context);
		if (IS_ERR(ring)) {
			ret = PTR_ERR(ring);
			goto err_unpin_kernel;
		}
	}

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	ret = intel_engine_init_breadcrumbs(engine);
	if (ret)
642
		goto err_unpin_preempt;
643

644 645
	ret = i915_gem_render_state_init(engine);
	if (ret)
646 647 648 649 650 651 652 653
		goto err_breadcrumbs;

	if (HWS_NEEDS_PHYSICAL(engine->i915))
		ret = init_phys_status_page(engine);
	else
		ret = init_status_page(engine);
	if (ret)
		goto err_rs_fini;
654

655
	return 0;
656

657 658 659 660
err_rs_fini:
	i915_gem_render_state_fini(engine);
err_breadcrumbs:
	intel_engine_fini_breadcrumbs(engine);
661
err_unpin_preempt:
662
	if (HAS_LOGICAL_RING_PREEMPTION(engine->i915))
663 664
		engine->context_unpin(engine, engine->i915->preempt_context);
err_unpin_kernel:
665 666
	engine->context_unpin(engine, engine->i915->kernel_context);
	return ret;
667
}
668 669 670 671 672 673 674 675 676 677

/**
 * intel_engines_cleanup_common - cleans up the engine state created by
 *                                the common initiailizers.
 * @engine: Engine to cleanup.
 *
 * This cleans up everything created by the common helpers.
 */
void intel_engine_cleanup_common(struct intel_engine_cs *engine)
{
678 679
	intel_engine_cleanup_scratch(engine);

680 681 682 683 684
	if (HWS_NEEDS_PHYSICAL(engine->i915))
		cleanup_phys_status_page(engine);
	else
		cleanup_status_page(engine);

685
	i915_gem_render_state_fini(engine);
686
	intel_engine_fini_breadcrumbs(engine);
687
	intel_engine_cleanup_cmd_parser(engine);
688
	i915_gem_batch_pool_fini(&engine->batch_pool);
689

690
	if (HAS_LOGICAL_RING_PREEMPTION(engine->i915))
691
		engine->context_unpin(engine, engine->i915->preempt_context);
692
	engine->context_unpin(engine, engine->i915->kernel_context);
693
}
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723

u64 intel_engine_get_active_head(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	u64 acthd;

	if (INTEL_GEN(dev_priv) >= 8)
		acthd = I915_READ64_2x32(RING_ACTHD(engine->mmio_base),
					 RING_ACTHD_UDW(engine->mmio_base));
	else if (INTEL_GEN(dev_priv) >= 4)
		acthd = I915_READ(RING_ACTHD(engine->mmio_base));
	else
		acthd = I915_READ(ACTHD);

	return acthd;
}

u64 intel_engine_get_last_batch_head(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	u64 bbaddr;

	if (INTEL_GEN(dev_priv) >= 8)
		bbaddr = I915_READ64_2x32(RING_BBADDR(engine->mmio_base),
					  RING_BBADDR_UDW(engine->mmio_base));
	else
		bbaddr = I915_READ(RING_BBADDR(engine->mmio_base));

	return bbaddr;
}
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827

const char *i915_cache_level_str(struct drm_i915_private *i915, int type)
{
	switch (type) {
	case I915_CACHE_NONE: return " uncached";
	case I915_CACHE_LLC: return HAS_LLC(i915) ? " LLC" : " snooped";
	case I915_CACHE_L3_LLC: return " L3+LLC";
	case I915_CACHE_WT: return " WT";
	default: return "";
	}
}

static inline uint32_t
read_subslice_reg(struct drm_i915_private *dev_priv, int slice,
		  int subslice, i915_reg_t reg)
{
	uint32_t mcr;
	uint32_t ret;
	enum forcewake_domains fw_domains;

	fw_domains = intel_uncore_forcewake_for_reg(dev_priv, reg,
						    FW_REG_READ);
	fw_domains |= intel_uncore_forcewake_for_reg(dev_priv,
						     GEN8_MCR_SELECTOR,
						     FW_REG_READ | FW_REG_WRITE);

	spin_lock_irq(&dev_priv->uncore.lock);
	intel_uncore_forcewake_get__locked(dev_priv, fw_domains);

	mcr = I915_READ_FW(GEN8_MCR_SELECTOR);
	/*
	 * The HW expects the slice and sublice selectors to be reset to 0
	 * after reading out the registers.
	 */
	WARN_ON_ONCE(mcr & (GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK));
	mcr &= ~(GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK);
	mcr |= GEN8_MCR_SLICE(slice) | GEN8_MCR_SUBSLICE(subslice);
	I915_WRITE_FW(GEN8_MCR_SELECTOR, mcr);

	ret = I915_READ_FW(reg);

	mcr &= ~(GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK);
	I915_WRITE_FW(GEN8_MCR_SELECTOR, mcr);

	intel_uncore_forcewake_put__locked(dev_priv, fw_domains);
	spin_unlock_irq(&dev_priv->uncore.lock);

	return ret;
}

/* NB: please notice the memset */
void intel_engine_get_instdone(struct intel_engine_cs *engine,
			       struct intel_instdone *instdone)
{
	struct drm_i915_private *dev_priv = engine->i915;
	u32 mmio_base = engine->mmio_base;
	int slice;
	int subslice;

	memset(instdone, 0, sizeof(*instdone));

	switch (INTEL_GEN(dev_priv)) {
	default:
		instdone->instdone = I915_READ(RING_INSTDONE(mmio_base));

		if (engine->id != RCS)
			break;

		instdone->slice_common = I915_READ(GEN7_SC_INSTDONE);
		for_each_instdone_slice_subslice(dev_priv, slice, subslice) {
			instdone->sampler[slice][subslice] =
				read_subslice_reg(dev_priv, slice, subslice,
						  GEN7_SAMPLER_INSTDONE);
			instdone->row[slice][subslice] =
				read_subslice_reg(dev_priv, slice, subslice,
						  GEN7_ROW_INSTDONE);
		}
		break;
	case 7:
		instdone->instdone = I915_READ(RING_INSTDONE(mmio_base));

		if (engine->id != RCS)
			break;

		instdone->slice_common = I915_READ(GEN7_SC_INSTDONE);
		instdone->sampler[0][0] = I915_READ(GEN7_SAMPLER_INSTDONE);
		instdone->row[0][0] = I915_READ(GEN7_ROW_INSTDONE);

		break;
	case 6:
	case 5:
	case 4:
		instdone->instdone = I915_READ(RING_INSTDONE(mmio_base));

		if (engine->id == RCS)
			/* HACK: Using the wrong struct member */
			instdone->slice_common = I915_READ(GEN4_INSTDONE1);
		break;
	case 3:
	case 2:
		instdone->instdone = I915_READ(GEN2_INSTDONE);
		break;
	}
}
828

829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871
static int wa_add(struct drm_i915_private *dev_priv,
		  i915_reg_t addr,
		  const u32 mask, const u32 val)
{
	const u32 idx = dev_priv->workarounds.count;

	if (WARN_ON(idx >= I915_MAX_WA_REGS))
		return -ENOSPC;

	dev_priv->workarounds.reg[idx].addr = addr;
	dev_priv->workarounds.reg[idx].value = val;
	dev_priv->workarounds.reg[idx].mask = mask;

	dev_priv->workarounds.count++;

	return 0;
}

#define WA_REG(addr, mask, val) do { \
		const int r = wa_add(dev_priv, (addr), (mask), (val)); \
		if (r) \
			return r; \
	} while (0)

#define WA_SET_BIT_MASKED(addr, mask) \
	WA_REG(addr, (mask), _MASKED_BIT_ENABLE(mask))

#define WA_CLR_BIT_MASKED(addr, mask) \
	WA_REG(addr, (mask), _MASKED_BIT_DISABLE(mask))

#define WA_SET_FIELD_MASKED(addr, mask, value) \
	WA_REG(addr, mask, _MASKED_FIELD(mask, value))

static int wa_ring_whitelist_reg(struct intel_engine_cs *engine,
				 i915_reg_t reg)
{
	struct drm_i915_private *dev_priv = engine->i915;
	struct i915_workarounds *wa = &dev_priv->workarounds;
	const uint32_t index = wa->hw_whitelist_count[engine->id];

	if (WARN_ON(index >= RING_MAX_NONPRIV_SLOTS))
		return -EINVAL;

872 873
	I915_WRITE(RING_FORCE_TO_NONPRIV(engine->mmio_base, index),
		   i915_mmio_reg_offset(reg));
874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984
	wa->hw_whitelist_count[engine->id]++;

	return 0;
}

static int gen8_init_workarounds(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;

	WA_SET_BIT_MASKED(INSTPM, INSTPM_FORCE_ORDERING);

	/* WaDisableAsyncFlipPerfMode:bdw,chv */
	WA_SET_BIT_MASKED(MI_MODE, ASYNC_FLIP_PERF_DISABLE);

	/* WaDisablePartialInstShootdown:bdw,chv */
	WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN,
			  PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE);

	/* Use Force Non-Coherent whenever executing a 3D context. This is a
	 * workaround for for a possible hang in the unlikely event a TLB
	 * invalidation occurs during a PSD flush.
	 */
	/* WaForceEnableNonCoherent:bdw,chv */
	/* WaHdcDisableFetchWhenMasked:bdw,chv */
	WA_SET_BIT_MASKED(HDC_CHICKEN0,
			  HDC_DONOT_FETCH_MEM_WHEN_MASKED |
			  HDC_FORCE_NON_COHERENT);

	/* From the Haswell PRM, Command Reference: Registers, CACHE_MODE_0:
	 * "The Hierarchical Z RAW Stall Optimization allows non-overlapping
	 *  polygons in the same 8x4 pixel/sample area to be processed without
	 *  stalling waiting for the earlier ones to write to Hierarchical Z
	 *  buffer."
	 *
	 * This optimization is off by default for BDW and CHV; turn it on.
	 */
	WA_CLR_BIT_MASKED(CACHE_MODE_0_GEN7, HIZ_RAW_STALL_OPT_DISABLE);

	/* Wa4x4STCOptimizationDisable:bdw,chv */
	WA_SET_BIT_MASKED(CACHE_MODE_1, GEN8_4x4_STC_OPTIMIZATION_DISABLE);

	/*
	 * BSpec recommends 8x4 when MSAA is used,
	 * however in practice 16x4 seems fastest.
	 *
	 * Note that PS/WM thread counts depend on the WIZ hashing
	 * disable bit, which we don't touch here, but it's good
	 * to keep in mind (see 3DSTATE_PS and 3DSTATE_WM).
	 */
	WA_SET_FIELD_MASKED(GEN7_GT_MODE,
			    GEN6_WIZ_HASHING_MASK,
			    GEN6_WIZ_HASHING_16x4);

	return 0;
}

static int bdw_init_workarounds(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	int ret;

	ret = gen8_init_workarounds(engine);
	if (ret)
		return ret;

	/* WaDisableThreadStallDopClockGating:bdw (pre-production) */
	WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN, STALL_DOP_GATING_DISABLE);

	/* WaDisableDopClockGating:bdw
	 *
	 * Also see the related UCGTCL1 write in broadwell_init_clock_gating()
	 * to disable EUTC clock gating.
	 */
	WA_SET_BIT_MASKED(GEN7_ROW_CHICKEN2,
			  DOP_CLOCK_GATING_DISABLE);

	WA_SET_BIT_MASKED(HALF_SLICE_CHICKEN3,
			  GEN8_SAMPLER_POWER_BYPASS_DIS);

	WA_SET_BIT_MASKED(HDC_CHICKEN0,
			  /* WaForceContextSaveRestoreNonCoherent:bdw */
			  HDC_FORCE_CONTEXT_SAVE_RESTORE_NON_COHERENT |
			  /* WaDisableFenceDestinationToSLM:bdw (pre-prod) */
			  (IS_BDW_GT3(dev_priv) ? HDC_FENCE_DEST_SLM_DISABLE : 0));

	return 0;
}

static int chv_init_workarounds(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	int ret;

	ret = gen8_init_workarounds(engine);
	if (ret)
		return ret;

	/* WaDisableThreadStallDopClockGating:chv */
	WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN, STALL_DOP_GATING_DISABLE);

	/* Improve HiZ throughput on CHV. */
	WA_SET_BIT_MASKED(HIZ_CHICKEN, CHV_HZ_8X8_MODE_IN_1X);

	return 0;
}

static int gen9_init_workarounds(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	int ret;

985
	/* WaConextSwitchWithConcurrentTLBInvalidate:skl,bxt,kbl,glk,cfl */
986 987
	I915_WRITE(GEN9_CSFE_CHICKEN1_RCS, _MASKED_BIT_ENABLE(GEN9_PREEMPT_GPGPU_SYNC_SWITCH_DISABLE));

988
	/* WaEnableLbsSlaRetryTimerDecrement:skl,bxt,kbl,glk,cfl */
989 990 991
	I915_WRITE(BDW_SCRATCH1, I915_READ(BDW_SCRATCH1) |
		   GEN9_LBS_SLA_RETRY_TIMER_DECREMENT_ENABLE);

R
Rodrigo Vivi 已提交
992 993 994 995
	/* WaDisableKillLogic:bxt,skl,kbl */
	if (!IS_COFFEELAKE(dev_priv))
		I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) |
			   ECOCHK_DIS_TLB);
996

997 998 999 1000 1001 1002 1003 1004 1005 1006
	if (HAS_LLC(dev_priv)) {
		/* WaCompressedResourceSamplerPbeMediaNewHashMode:skl,kbl
		 *
		 * Must match Display Engine. See
		 * WaCompressedResourceDisplayNewHashMode.
		 */
		WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
				  GEN9_PBE_COMPRESSED_HASH_SELECTION);
		WA_SET_BIT_MASKED(GEN9_HALF_SLICE_CHICKEN7,
				  GEN9_SAMPLER_HASH_COMPRESSED_READ_ADDR);
1007 1008 1009 1010 1011

		I915_WRITE(MMCD_MISC_CTRL,
			   I915_READ(MMCD_MISC_CTRL) |
			   MMCD_PCLA |
			   MMCD_HOTSPOT_EN);
1012 1013
	}

1014 1015
	/* WaClearFlowControlGpgpuContextSave:skl,bxt,kbl,glk,cfl */
	/* WaDisablePartialInstShootdown:skl,bxt,kbl,glk,cfl */
1016 1017 1018 1019 1020
	WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN,
			  FLOW_CONTROL_ENABLE |
			  PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE);

	/* Syncing dependencies between camera and graphics:skl,bxt,kbl */
1021 1022 1023
	if (!IS_COFFEELAKE(dev_priv))
		WA_SET_BIT_MASKED(HALF_SLICE_CHICKEN3,
				  GEN9_DISABLE_OCL_OOB_SUPPRESS_LOGIC);
1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040

	/* WaDisableDgMirrorFixInHalfSliceChicken5:bxt */
	if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1))
		WA_CLR_BIT_MASKED(GEN9_HALF_SLICE_CHICKEN5,
				  GEN9_DG_MIRROR_FIX_ENABLE);

	/* WaSetDisablePixMaskCammingAndRhwoInCommonSliceChicken:bxt */
	if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1)) {
		WA_SET_BIT_MASKED(GEN7_COMMON_SLICE_CHICKEN1,
				  GEN9_RHWO_OPTIMIZATION_DISABLE);
		/*
		 * WA also requires GEN9_SLICE_COMMON_ECO_CHICKEN0[14:14] to be set
		 * but we do that in per ctx batchbuffer as there is an issue
		 * with this register not getting restored on ctx restore
		 */
	}

1041 1042
	/* WaEnableYV12BugFixInHalfSliceChicken7:skl,bxt,kbl,glk,cfl */
	/* WaEnableSamplerGPGPUPreemptionSupport:skl,bxt,kbl,cfl */
1043
	WA_SET_BIT_MASKED(GEN9_HALF_SLICE_CHICKEN7,
1044
			  GEN9_ENABLE_YV12_BUGFIX |
1045 1046
			  GEN9_ENABLE_GPGPU_PREEMPTION);

1047 1048
	/* Wa4x4STCOptimizationDisable:skl,bxt,kbl,glk,cfl */
	/* WaDisablePartialResolveInVc:skl,bxt,kbl,cfl */
1049 1050 1051
	WA_SET_BIT_MASKED(CACHE_MODE_1, (GEN8_4x4_STC_OPTIMIZATION_DISABLE |
					 GEN9_PARTIAL_RESOLVE_IN_VC_DISABLE));

1052
	/* WaCcsTlbPrefetchDisable:skl,bxt,kbl,glk,cfl */
1053 1054 1055 1056 1057 1058 1059 1060
	WA_CLR_BIT_MASKED(GEN9_HALF_SLICE_CHICKEN5,
			  GEN9_CCS_TLB_PREFETCH_ENABLE);

	/* WaDisableMaskBasedCammingInRCC:bxt */
	if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1))
		WA_SET_BIT_MASKED(SLICE_ECO_CHICKEN0,
				  PIXEL_MASK_CAMMING_DISABLE);

1061
	/* WaForceContextSaveRestoreNonCoherent:skl,bxt,kbl,cfl */
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078
	WA_SET_BIT_MASKED(HDC_CHICKEN0,
			  HDC_FORCE_CONTEXT_SAVE_RESTORE_NON_COHERENT |
			  HDC_FORCE_CSR_NON_COHERENT_OVR_DISABLE);

	/* WaForceEnableNonCoherent and WaDisableHDCInvalidation are
	 * both tied to WaForceContextSaveRestoreNonCoherent
	 * in some hsds for skl. We keep the tie for all gen9. The
	 * documentation is a bit hazy and so we want to get common behaviour,
	 * even though there is no clear evidence we would need both on kbl/bxt.
	 * This area has been source of system hangs so we play it safe
	 * and mimic the skl regardless of what bspec says.
	 *
	 * Use Force Non-Coherent whenever executing a 3D context. This
	 * is a workaround for a possible hang in the unlikely event
	 * a TLB invalidation occurs during a PSD flush.
	 */

1079
	/* WaForceEnableNonCoherent:skl,bxt,kbl,cfl */
1080 1081 1082
	WA_SET_BIT_MASKED(HDC_CHICKEN0,
			  HDC_FORCE_NON_COHERENT);

R
Rodrigo Vivi 已提交
1083 1084 1085
	/* WaDisableHDCInvalidation:skl,bxt,kbl,cfl */
	I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) |
		   BDW_DISABLE_HDC_INVALIDATION);
1086

1087
	/* WaDisableSamplerPowerBypassForSOPingPong:skl,bxt,kbl,cfl */
1088 1089
	if (IS_SKYLAKE(dev_priv) ||
	    IS_KABYLAKE(dev_priv) ||
1090
	    IS_COFFEELAKE(dev_priv) ||
1091 1092 1093 1094
	    IS_BXT_REVID(dev_priv, 0, BXT_REVID_B0))
		WA_SET_BIT_MASKED(HALF_SLICE_CHICKEN3,
				  GEN8_SAMPLER_POWER_BYPASS_DIS);

1095
	/* WaDisableSTUnitPowerOptimization:skl,bxt,kbl,glk,cfl */
1096 1097
	WA_SET_BIT_MASKED(HALF_SLICE_CHICKEN2, GEN8_ST_PO_DISABLE);

1098
	/* WaOCLCoherentLineFlush:skl,bxt,kbl,cfl */
1099 1100 1101
	I915_WRITE(GEN8_L3SQCREG4, (I915_READ(GEN8_L3SQCREG4) |
				    GEN8_LQSC_FLUSH_COHERENT_LINES));

1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119
	/*
	 * Supporting preemption with fine-granularity requires changes in the
	 * batch buffer programming. Since we can't break old userspace, we
	 * need to set our default preemption level to safe value. Userspace is
	 * still able to use more fine-grained preemption levels, since in
	 * WaEnablePreemptionGranularityControlByUMD we're whitelisting the
	 * per-ctx register. As such, WaDisable{3D,GPGPU}MidCmdPreemption are
	 * not real HW workarounds, but merely a way to start using preemption
	 * while maintaining old contract with userspace.
	 */

	/* WaDisable3DMidCmdPreemption:skl,bxt,glk,cfl,[cnl] */
	WA_CLR_BIT_MASKED(GEN8_CS_CHICKEN1, GEN9_PREEMPT_3D_OBJECT_LEVEL);

	/* WaDisableGPGPUMidCmdPreemption:skl,bxt,blk,cfl,[cnl] */
	WA_SET_FIELD_MASKED(GEN8_CS_CHICKEN1, GEN9_PREEMPT_GPGPU_LEVEL_MASK,
			    GEN9_PREEMPT_GPGPU_COMMAND_LEVEL);

1120
	/* WaVFEStateAfterPipeControlwithMediaStateClear:skl,bxt,glk,cfl */
1121 1122 1123 1124
	ret = wa_ring_whitelist_reg(engine, GEN9_CTX_PREEMPT_REG);
	if (ret)
		return ret;

1125 1126 1127 1128
	/* WaEnablePreemptionGranularityControlByUMD:skl,bxt,kbl,cfl,[cnl] */
	I915_WRITE(GEN7_FF_SLICE_CS_CHICKEN1,
		   _MASKED_BIT_ENABLE(GEN9_FFSC_PERCTX_PREEMPT_CTRL));
	ret = wa_ring_whitelist_reg(engine, GEN8_CS_CHICKEN1);
1129 1130 1131
	if (ret)
		return ret;

1132
	/* WaAllowUMDToModifyHDCChicken1:skl,bxt,kbl,glk,cfl */
1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194
	ret = wa_ring_whitelist_reg(engine, GEN8_HDC_CHICKEN1);
	if (ret)
		return ret;

	return 0;
}

static int skl_tune_iz_hashing(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	u8 vals[3] = { 0, 0, 0 };
	unsigned int i;

	for (i = 0; i < 3; i++) {
		u8 ss;

		/*
		 * Only consider slices where one, and only one, subslice has 7
		 * EUs
		 */
		if (!is_power_of_2(INTEL_INFO(dev_priv)->sseu.subslice_7eu[i]))
			continue;

		/*
		 * subslice_7eu[i] != 0 (because of the check above) and
		 * ss_max == 4 (maximum number of subslices possible per slice)
		 *
		 * ->    0 <= ss <= 3;
		 */
		ss = ffs(INTEL_INFO(dev_priv)->sseu.subslice_7eu[i]) - 1;
		vals[i] = 3 - ss;
	}

	if (vals[0] == 0 && vals[1] == 0 && vals[2] == 0)
		return 0;

	/* Tune IZ hashing. See intel_device_info_runtime_init() */
	WA_SET_FIELD_MASKED(GEN7_GT_MODE,
			    GEN9_IZ_HASHING_MASK(2) |
			    GEN9_IZ_HASHING_MASK(1) |
			    GEN9_IZ_HASHING_MASK(0),
			    GEN9_IZ_HASHING(2, vals[2]) |
			    GEN9_IZ_HASHING(1, vals[1]) |
			    GEN9_IZ_HASHING(0, vals[0]));

	return 0;
}

static int skl_init_workarounds(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	int ret;

	ret = gen9_init_workarounds(engine);
	if (ret)
		return ret;

	/* WaEnableGapsTsvCreditFix:skl */
	I915_WRITE(GEN8_GARBCNTL, (I915_READ(GEN8_GARBCNTL) |
				   GEN9_GAPS_TSV_CREDIT_DISABLE));

	/* WaDisableGafsUnitClkGating:skl */
1195 1196
	I915_WRITE(GEN7_UCGCTL4, (I915_READ(GEN7_UCGCTL4) |
				  GEN8_EU_GAUNIT_CLOCK_GATE_DISABLE));
1197 1198 1199

	/* WaInPlaceDecompressionHang:skl */
	if (IS_SKL_REVID(dev_priv, SKL_REVID_H0, REVID_FOREVER))
1200 1201 1202
		I915_WRITE(GEN9_GAMT_ECO_REG_RW_IA,
			   (I915_READ(GEN9_GAMT_ECO_REG_RW_IA) |
			    GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS));
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237

	/* WaDisableLSQCROPERFforOCL:skl */
	ret = wa_ring_whitelist_reg(engine, GEN8_L3SQCREG4);
	if (ret)
		return ret;

	return skl_tune_iz_hashing(engine);
}

static int bxt_init_workarounds(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	int ret;

	ret = gen9_init_workarounds(engine);
	if (ret)
		return ret;

	/* WaStoreMultiplePTEenable:bxt */
	/* This is a requirement according to Hardware specification */
	if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1))
		I915_WRITE(TILECTL, I915_READ(TILECTL) | TILECTL_TLBPF);

	/* WaSetClckGatingDisableMedia:bxt */
	if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1)) {
		I915_WRITE(GEN7_MISCCPCTL, (I915_READ(GEN7_MISCCPCTL) &
					    ~GEN8_DOP_CLOCK_GATE_MEDIA_ENABLE));
	}

	/* WaDisableThreadStallDopClockGating:bxt */
	WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN,
			  STALL_DOP_GATING_DISABLE);

	/* WaDisablePooledEuLoadBalancingFix:bxt */
	if (IS_BXT_REVID(dev_priv, BXT_REVID_B0, REVID_FOREVER)) {
1238 1239
		I915_WRITE(FF_SLICE_CS_CHICKEN2,
			   _MASKED_BIT_ENABLE(GEN9_POOLED_EU_LOAD_BALANCING_FIX_DISABLE));
1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263
	}

	/* WaDisableSbeCacheDispatchPortSharing:bxt */
	if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_B0)) {
		WA_SET_BIT_MASKED(
			GEN7_HALF_SLICE_CHICKEN1,
			GEN7_SBE_SS_CACHE_DISPATCH_PORT_SHARING_DISABLE);
	}

	/* WaDisableObjectLevelPreemptionForTrifanOrPolygon:bxt */
	/* WaDisableObjectLevelPreemptionForInstancedDraw:bxt */
	/* WaDisableObjectLevelPreemtionForInstanceId:bxt */
	/* WaDisableLSQCROPERFforOCL:bxt */
	if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1)) {
		ret = wa_ring_whitelist_reg(engine, GEN9_CS_DEBUG_MODE1);
		if (ret)
			return ret;

		ret = wa_ring_whitelist_reg(engine, GEN8_L3SQCREG4);
		if (ret)
			return ret;
	}

	/* WaProgramL3SqcReg1DefaultForPerf:bxt */
1264 1265 1266 1267 1268 1269
	if (IS_BXT_REVID(dev_priv, BXT_REVID_B0, REVID_FOREVER)) {
		u32 val = I915_READ(GEN8_L3SQCREG1);
		val &= ~L3_PRIO_CREDITS_MASK;
		val |= L3_GENERAL_PRIO_CREDITS(62) | L3_HIGH_PRIO_CREDITS(2);
		I915_WRITE(GEN8_L3SQCREG1, val);
	}
1270 1271 1272 1273 1274 1275 1276 1277

	/* WaToEnableHwFixForPushConstHWBug:bxt */
	if (IS_BXT_REVID(dev_priv, BXT_REVID_C0, REVID_FOREVER))
		WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
				  GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION);

	/* WaInPlaceDecompressionHang:bxt */
	if (IS_BXT_REVID(dev_priv, BXT_REVID_C0, REVID_FOREVER))
1278 1279 1280
		I915_WRITE(GEN9_GAMT_ECO_REG_RW_IA,
			   (I915_READ(GEN9_GAMT_ECO_REG_RW_IA) |
			    GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS));
1281 1282 1283 1284

	return 0;
}

1285 1286 1287 1288 1289
static int cnl_init_workarounds(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	int ret;

1290
	/* WaDisableI2mCycleOnWRPort:cnl (pre-prod) */
1291
	if (IS_CNL_REVID(dev_priv, CNL_REVID_B0, CNL_REVID_B0))
1292 1293 1294
		I915_WRITE(GAMT_CHKN_BIT_REG,
			   (I915_READ(GAMT_CHKN_BIT_REG) |
			    GAMT_CHKN_DISABLE_I2M_CYCLE_ON_WR_PORT));
1295

1296 1297 1298 1299
	/* WaForceContextSaveRestoreNonCoherent:cnl */
	WA_SET_BIT_MASKED(CNL_HDC_CHICKEN0,
			  HDC_FORCE_CONTEXT_SAVE_RESTORE_NON_COHERENT);

1300 1301 1302 1303
	/* WaThrottleEUPerfToAvoidTDBackPressure:cnl(pre-prod) */
	if (IS_CNL_REVID(dev_priv, CNL_REVID_B0, CNL_REVID_B0))
		WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN, THROTTLE_12_5);

1304 1305 1306 1307
	/* WaDisableReplayBufferBankArbitrationOptimization:cnl */
	WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
			  GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION);

1308 1309 1310 1311 1312
	/* WaDisableEnhancedSBEVertexCaching:cnl (pre-prod) */
	if (IS_CNL_REVID(dev_priv, 0, CNL_REVID_B0))
		WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
				  GEN8_CSC2_SBE_VUE_CACHE_CONSERVATIVE);

1313
	/* WaInPlaceDecompressionHang:cnl */
1314 1315 1316
	I915_WRITE(GEN9_GAMT_ECO_REG_RW_IA,
		   (I915_READ(GEN9_GAMT_ECO_REG_RW_IA) |
		    GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS));
1317

1318
	/* WaPushConstantDereferenceHoldDisable:cnl */
1319
	WA_SET_BIT_MASKED(GEN7_ROW_CHICKEN2, PUSH_CONSTANT_DEREF_DISABLE);
1320

1321 1322 1323
	/* FtrEnableFastAnisoL1BankingFix: cnl */
	WA_SET_BIT_MASKED(HALF_SLICE_CHICKEN3, CNL_FAST_ANISO_L1_BANKING_FIX);

1324 1325 1326 1327 1328 1329 1330
	/* WaDisable3DMidCmdPreemption:cnl */
	WA_CLR_BIT_MASKED(GEN8_CS_CHICKEN1, GEN9_PREEMPT_3D_OBJECT_LEVEL);

	/* WaDisableGPGPUMidCmdPreemption:cnl */
	WA_SET_FIELD_MASKED(GEN8_CS_CHICKEN1, GEN9_PREEMPT_GPGPU_LEVEL_MASK,
			    GEN9_PREEMPT_GPGPU_COMMAND_LEVEL);

1331 1332 1333
	/* ReadHitWriteOnlyDisable: cnl */
	WA_SET_BIT_MASKED(SLICE_UNIT_LEVEL_CLKGATE, RCCUNIT_CLKGATE_DIS);

1334
	/* WaEnablePreemptionGranularityControlByUMD:cnl */
1335 1336
	I915_WRITE(GEN7_FF_SLICE_CS_CHICKEN1,
		   _MASKED_BIT_ENABLE(GEN9_FFSC_PERCTX_PREEMPT_CTRL));
1337 1338 1339 1340 1341 1342 1343
	ret= wa_ring_whitelist_reg(engine, GEN8_CS_CHICKEN1);
	if (ret)
		return ret;

	return 0;
}

1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358
static int kbl_init_workarounds(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	int ret;

	ret = gen9_init_workarounds(engine);
	if (ret)
		return ret;

	/* WaEnableGapsTsvCreditFix:kbl */
	I915_WRITE(GEN8_GARBCNTL, (I915_READ(GEN8_GARBCNTL) |
				   GEN9_GAPS_TSV_CREDIT_DISABLE));

	/* WaDisableDynamicCreditSharing:kbl */
	if (IS_KBL_REVID(dev_priv, 0, KBL_REVID_B0))
1359 1360 1361
		I915_WRITE(GAMT_CHKN_BIT_REG,
			   (I915_READ(GAMT_CHKN_BIT_REG) |
			    GAMT_CHKN_DISABLE_DYNAMIC_CREDIT_SHARING));
1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373

	/* WaDisableFenceDestinationToSLM:kbl (pre-prod) */
	if (IS_KBL_REVID(dev_priv, KBL_REVID_A0, KBL_REVID_A0))
		WA_SET_BIT_MASKED(HDC_CHICKEN0,
				  HDC_FENCE_DEST_SLM_DISABLE);

	/* WaToEnableHwFixForPushConstHWBug:kbl */
	if (IS_KBL_REVID(dev_priv, KBL_REVID_C0, REVID_FOREVER))
		WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
				  GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION);

	/* WaDisableGafsUnitClkGating:kbl */
1374 1375
	I915_WRITE(GEN7_UCGCTL4, (I915_READ(GEN7_UCGCTL4) |
				  GEN8_EU_GAUNIT_CLOCK_GATE_DISABLE));
1376 1377 1378 1379 1380 1381 1382

	/* WaDisableSbeCacheDispatchPortSharing:kbl */
	WA_SET_BIT_MASKED(
		GEN7_HALF_SLICE_CHICKEN1,
		GEN7_SBE_SS_CACHE_DISPATCH_PORT_SHARING_DISABLE);

	/* WaInPlaceDecompressionHang:kbl */
1383 1384 1385
	I915_WRITE(GEN9_GAMT_ECO_REG_RW_IA,
		   (I915_READ(GEN9_GAMT_ECO_REG_RW_IA) |
		    GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS));
1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410

	/* WaDisableLSQCROPERFforOCL:kbl */
	ret = wa_ring_whitelist_reg(engine, GEN8_L3SQCREG4);
	if (ret)
		return ret;

	return 0;
}

static int glk_init_workarounds(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	int ret;

	ret = gen9_init_workarounds(engine);
	if (ret)
		return ret;

	/* WaToEnableHwFixForPushConstHWBug:glk */
	WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
			  GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION);

	return 0;
}

1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428
static int cfl_init_workarounds(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	int ret;

	ret = gen9_init_workarounds(engine);
	if (ret)
		return ret;

	/* WaEnableGapsTsvCreditFix:cfl */
	I915_WRITE(GEN8_GARBCNTL, (I915_READ(GEN8_GARBCNTL) |
				   GEN9_GAPS_TSV_CREDIT_DISABLE));

	/* WaToEnableHwFixForPushConstHWBug:cfl */
	WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
			  GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION);

	/* WaDisableGafsUnitClkGating:cfl */
1429 1430
	I915_WRITE(GEN7_UCGCTL4, (I915_READ(GEN7_UCGCTL4) |
				  GEN8_EU_GAUNIT_CLOCK_GATE_DISABLE));
1431 1432 1433 1434 1435 1436 1437

	/* WaDisableSbeCacheDispatchPortSharing:cfl */
	WA_SET_BIT_MASKED(
		GEN7_HALF_SLICE_CHICKEN1,
		GEN7_SBE_SS_CACHE_DISPATCH_PORT_SHARING_DISABLE);

	/* WaInPlaceDecompressionHang:cfl */
1438 1439 1440
	I915_WRITE(GEN9_GAMT_ECO_REG_RW_IA,
		   (I915_READ(GEN9_GAMT_ECO_REG_RW_IA) |
		    GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS));
1441 1442 1443 1444

	return 0;
}

1445 1446 1447
int init_workarounds_ring(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
1448
	int err;
1449 1450 1451 1452

	WARN_ON(engine->id != RCS);

	dev_priv->workarounds.count = 0;
1453
	dev_priv->workarounds.hw_whitelist_count[engine->id] = 0;
1454 1455

	if (IS_BROADWELL(dev_priv))
1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466
		err = bdw_init_workarounds(engine);
	else if (IS_CHERRYVIEW(dev_priv))
		err = chv_init_workarounds(engine);
	else if (IS_SKYLAKE(dev_priv))
		err =  skl_init_workarounds(engine);
	else if (IS_BROXTON(dev_priv))
		err = bxt_init_workarounds(engine);
	else if (IS_KABYLAKE(dev_priv))
		err = kbl_init_workarounds(engine);
	else if (IS_GEMINILAKE(dev_priv))
		err =  glk_init_workarounds(engine);
1467 1468
	else if (IS_COFFEELAKE(dev_priv))
		err = cfl_init_workarounds(engine);
1469 1470
	else if (IS_CANNONLAKE(dev_priv))
		err = cnl_init_workarounds(engine);
1471 1472 1473 1474
	else
		err = 0;
	if (err)
		return err;
1475

1476 1477
	DRM_DEBUG_DRIVER("%s: Number of context specific w/a: %d\n",
			 engine->name, dev_priv->workarounds.count);
1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513
	return 0;
}

int intel_ring_workarounds_emit(struct drm_i915_gem_request *req)
{
	struct i915_workarounds *w = &req->i915->workarounds;
	u32 *cs;
	int ret, i;

	if (w->count == 0)
		return 0;

	ret = req->engine->emit_flush(req, EMIT_BARRIER);
	if (ret)
		return ret;

	cs = intel_ring_begin(req, (w->count * 2 + 2));
	if (IS_ERR(cs))
		return PTR_ERR(cs);

	*cs++ = MI_LOAD_REGISTER_IMM(w->count);
	for (i = 0; i < w->count; i++) {
		*cs++ = i915_mmio_reg_offset(w->reg[i].addr);
		*cs++ = w->reg[i].value;
	}
	*cs++ = MI_NOOP;

	intel_ring_advance(req, cs);

	ret = req->engine->emit_flush(req, EMIT_BARRIER);
	if (ret)
		return ret;

	return 0;
}

1514 1515 1516 1517 1518 1519 1520
static bool ring_is_idle(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	bool idle = true;

	intel_runtime_pm_get(dev_priv);

1521 1522 1523 1524 1525
	/* First check that no commands are left in the ring */
	if ((I915_READ_HEAD(engine) & HEAD_ADDR) !=
	    (I915_READ_TAIL(engine) & TAIL_ADDR))
		idle = false;

1526 1527 1528 1529 1530 1531 1532 1533 1534
	/* No bit for gen2, so assume the CS parser is idle */
	if (INTEL_GEN(dev_priv) > 2 && !(I915_READ_MODE(engine) & MODE_IDLE))
		idle = false;

	intel_runtime_pm_put(dev_priv);

	return idle;
}

1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545
/**
 * intel_engine_is_idle() - Report if the engine has finished process all work
 * @engine: the intel_engine_cs
 *
 * Return true if there are no requests pending, nothing left to be submitted
 * to hardware, and that the engine is idle.
 */
bool intel_engine_is_idle(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;

1546 1547 1548 1549
	/* More white lies, if wedged, hw state is inconsistent */
	if (i915_terminally_wedged(&dev_priv->gpu_error))
		return true;

1550 1551 1552 1553 1554
	/* Any inflight/incomplete requests? */
	if (!i915_seqno_passed(intel_engine_get_seqno(engine),
			       intel_engine_last_submit(engine)))
		return false;

1555 1556 1557
	if (I915_SELFTEST_ONLY(engine->breadcrumbs.mock))
		return true;

1558 1559 1560 1561
	/* Interrupt/tasklet pending? */
	if (test_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted))
		return false;

1562 1563
	/* Waiting to drain ELSP? */
	if (READ_ONCE(engine->execlists.active))
1564 1565
		return false;

1566
	/* ELSP is empty, but there are ready requests? */
1567
	if (READ_ONCE(engine->execlists.first))
1568 1569
		return false;

1570
	/* Ring stopped? */
1571
	if (!ring_is_idle(engine))
1572 1573 1574 1575 1576
		return false;

	return true;
}

1577 1578 1579 1580 1581
bool intel_engines_are_idle(struct drm_i915_private *dev_priv)
{
	struct intel_engine_cs *engine;
	enum intel_engine_id id;

1582 1583 1584 1585 1586 1587 1588 1589 1590
	if (READ_ONCE(dev_priv->gt.active_requests))
		return false;

	/* If the driver is wedged, HW state may be very inconsistent and
	 * report that it is still busy, even though we have stopped using it.
	 */
	if (i915_terminally_wedged(&dev_priv->gpu_error))
		return true;

1591 1592 1593 1594 1595 1596 1597 1598
	for_each_engine(engine, dev_priv, id) {
		if (!intel_engine_is_idle(engine))
			return false;
	}

	return true;
}

1599 1600 1601 1602 1603 1604 1605 1606
/**
 * intel_engine_has_kernel_context:
 * @engine: the engine
 *
 * Returns true if the last context to be executed on this engine, or has been
 * executed if the engine is already idle, is the kernel context
 * (#i915.kernel_context).
 */
1607 1608
bool intel_engine_has_kernel_context(const struct intel_engine_cs *engine)
{
1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624
	const struct i915_gem_context * const kernel_context =
		engine->i915->kernel_context;
	struct drm_i915_gem_request *rq;

	lockdep_assert_held(&engine->i915->drm.struct_mutex);

	/*
	 * Check the last context seen by the engine. If active, it will be
	 * the last request that remains in the timeline. When idle, it is
	 * the last executed context as tracked by retirement.
	 */
	rq = __i915_gem_active_peek(&engine->timeline->last_request);
	if (rq)
		return rq->ctx == kernel_context;
	else
		return engine->last_retired_context == kernel_context;
1625 1626
}

1627 1628 1629 1630 1631 1632 1633 1634 1635
void intel_engines_reset_default_submission(struct drm_i915_private *i915)
{
	struct intel_engine_cs *engine;
	enum intel_engine_id id;

	for_each_engine(engine, i915, id)
		engine->set_default_submission(engine);
}

1636 1637 1638 1639 1640 1641 1642 1643 1644
/**
 * intel_engines_park: called when the GT is transitioning from busy->idle
 * @i915: the i915 device
 *
 * The GT is now idle and about to go to sleep (maybe never to wake again?).
 * Time for us to tidy and put away our toys (release resources back to the
 * system).
 */
void intel_engines_park(struct drm_i915_private *i915)
1645 1646 1647 1648 1649
{
	struct intel_engine_cs *engine;
	enum intel_engine_id id;

	for_each_engine(engine, i915, id) {
1650 1651 1652 1653
		/* Flush the residual irq tasklets first. */
		intel_engine_disarm_breadcrumbs(engine);
		tasklet_kill(&engine->execlists.irq_tasklet);

1654 1655 1656 1657 1658
		/*
		 * We are committed now to parking the engines, make sure there
		 * will be no more interrupts arriving later and the engines
		 * are truly idle.
		 */
1659
		if (wait_for(intel_engine_is_idle(engine), 10)) {
1660 1661
			struct drm_printer p = drm_debug_printer(__func__);

1662 1663 1664
			dev_err(i915->drm.dev,
				"%s is not idle before parking\n",
				engine->name);
1665 1666 1667
			intel_engine_dump(engine, &p);
		}

1668 1669 1670 1671
		if (engine->park)
			engine->park(engine);

		i915_gem_batch_pool_fini(&engine->batch_pool);
1672
		engine->execlists.no_priolist = false;
1673 1674 1675
	}
}

1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692
/**
 * intel_engines_unpark: called when the GT is transitioning from idle->busy
 * @i915: the i915 device
 *
 * The GT was idle and now about to fire up with some new user requests.
 */
void intel_engines_unpark(struct drm_i915_private *i915)
{
	struct intel_engine_cs *engine;
	enum intel_engine_id id;

	for_each_engine(engine, i915, id) {
		if (engine->unpark)
			engine->unpark(engine);
	}
}

1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707
bool intel_engine_can_store_dword(struct intel_engine_cs *engine)
{
	switch (INTEL_GEN(engine->i915)) {
	case 2:
		return false; /* uses physical not virtual addresses */
	case 3:
		/* maybe only uses physical not virtual addresses */
		return !(IS_I915G(engine->i915) || IS_I915GM(engine->i915));
	case 6:
		return engine->class != VIDEO_DECODE_CLASS; /* b0rked */
	default:
		return true;
	}
}

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static void print_request(struct drm_printer *m,
			  struct drm_i915_gem_request *rq,
			  const char *prefix)
{
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	drm_printf(m, "%s%x%s [%x:%x] prio=%d @ %dms: %s\n", prefix,
		   rq->global_seqno,
		   i915_gem_request_completed(rq) ? "!" : "",
		   rq->ctx->hw_id, rq->fence.seqno,
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		   rq->priotree.priority,
		   jiffies_to_msecs(jiffies - rq->emitted_jiffies),
		   rq->timeline->common->name);
}

void intel_engine_dump(struct intel_engine_cs *engine, struct drm_printer *m)
{
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	struct intel_breadcrumbs * const b = &engine->breadcrumbs;
	const struct intel_engine_execlists * const execlists = &engine->execlists;
	struct i915_gpu_error * const error = &engine->i915->gpu_error;
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	struct drm_i915_private *dev_priv = engine->i915;
	struct drm_i915_gem_request *rq;
	struct rb_node *rb;
	u64 addr;

	drm_printf(m, "%s\n", engine->name);
	drm_printf(m, "\tcurrent seqno %x, last %x, hangcheck %x [%d ms], inflight %d\n",
		   intel_engine_get_seqno(engine),
		   intel_engine_last_submit(engine),
		   engine->hangcheck.seqno,
		   jiffies_to_msecs(jiffies - engine->hangcheck.action_timestamp),
		   engine->timeline->inflight_seqnos);
	drm_printf(m, "\tReset count: %d\n",
		   i915_reset_engine_count(error, engine));

	rcu_read_lock();

	drm_printf(m, "\tRequests:\n");

	rq = list_first_entry(&engine->timeline->requests,
			      struct drm_i915_gem_request, link);
	if (&rq->link != &engine->timeline->requests)
		print_request(m, rq, "\t\tfirst  ");

	rq = list_last_entry(&engine->timeline->requests,
			     struct drm_i915_gem_request, link);
	if (&rq->link != &engine->timeline->requests)
		print_request(m, rq, "\t\tlast   ");

	rq = i915_gem_find_active_request(engine);
	if (rq) {
		print_request(m, rq, "\t\tactive ");
		drm_printf(m,
			   "\t\t[head %04x, postfix %04x, tail %04x, batch 0x%08x_%08x]\n",
			   rq->head, rq->postfix, rq->tail,
			   rq->batch ? upper_32_bits(rq->batch->node.start) : ~0u,
			   rq->batch ? lower_32_bits(rq->batch->node.start) : ~0u);
	}

	drm_printf(m, "\tRING_START: 0x%08x [0x%08x]\n",
		   I915_READ(RING_START(engine->mmio_base)),
		   rq ? i915_ggtt_offset(rq->ring->vma) : 0);
	drm_printf(m, "\tRING_HEAD:  0x%08x [0x%08x]\n",
		   I915_READ(RING_HEAD(engine->mmio_base)) & HEAD_ADDR,
		   rq ? rq->ring->head : 0);
	drm_printf(m, "\tRING_TAIL:  0x%08x [0x%08x]\n",
		   I915_READ(RING_TAIL(engine->mmio_base)) & TAIL_ADDR,
		   rq ? rq->ring->tail : 0);
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	drm_printf(m, "\tRING_CTL:   0x%08x%s\n",
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		   I915_READ(RING_CTL(engine->mmio_base)),
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		   I915_READ(RING_CTL(engine->mmio_base)) & (RING_WAIT | RING_WAIT_SEMAPHORE) ? " [waiting]" : "");
	if (INTEL_GEN(engine->i915) > 2) {
		drm_printf(m, "\tRING_MODE:  0x%08x%s\n",
			   I915_READ(RING_MI_MODE(engine->mmio_base)),
			   I915_READ(RING_MI_MODE(engine->mmio_base)) & (MODE_IDLE) ? " [idle]" : "");
	}
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	rcu_read_unlock();

	addr = intel_engine_get_active_head(engine);
	drm_printf(m, "\tACTHD:  0x%08x_%08x\n",
		   upper_32_bits(addr), lower_32_bits(addr));
	addr = intel_engine_get_last_batch_head(engine);
	drm_printf(m, "\tBBADDR: 0x%08x_%08x\n",
		   upper_32_bits(addr), lower_32_bits(addr));

	if (i915_modparams.enable_execlists) {
		const u32 *hws = &engine->status_page.page_addr[I915_HWS_CSB_BUF0_INDEX];
		u32 ptr, read, write;
		unsigned int idx;

		drm_printf(m, "\tExeclist status: 0x%08x %08x\n",
			   I915_READ(RING_EXECLIST_STATUS_LO(engine)),
			   I915_READ(RING_EXECLIST_STATUS_HI(engine)));

		ptr = I915_READ(RING_CONTEXT_STATUS_PTR(engine));
		read = GEN8_CSB_READ_PTR(ptr);
		write = GEN8_CSB_WRITE_PTR(ptr);
		drm_printf(m, "\tExeclist CSB read %d [%d cached], write %d [%d from hws], interrupt posted? %s\n",
			   read, execlists->csb_head,
			   write,
			   intel_read_status_page(engine, intel_hws_csb_write_index(engine->i915)),
			   yesno(test_bit(ENGINE_IRQ_EXECLIST,
					  &engine->irq_posted)));
		if (read >= GEN8_CSB_ENTRIES)
			read = 0;
		if (write >= GEN8_CSB_ENTRIES)
			write = 0;
		if (read > write)
			write += GEN8_CSB_ENTRIES;
		while (read < write) {
			idx = ++read % GEN8_CSB_ENTRIES;
			drm_printf(m, "\tExeclist CSB[%d]: 0x%08x [0x%08x in hwsp], context: %d [%d in hwsp]\n",
				   idx,
				   I915_READ(RING_CONTEXT_STATUS_BUF_LO(engine, idx)),
				   hws[idx * 2],
				   I915_READ(RING_CONTEXT_STATUS_BUF_HI(engine, idx)),
				   hws[idx * 2 + 1]);
		}

		rcu_read_lock();
		for (idx = 0; idx < execlists_num_ports(execlists); idx++) {
			unsigned int count;

			rq = port_unpack(&execlists->port[idx], &count);
			if (rq) {
				drm_printf(m, "\t\tELSP[%d] count=%d, ",
					   idx, count);
				print_request(m, rq, "rq: ");
			} else {
				drm_printf(m, "\t\tELSP[%d] idle\n",
					   idx);
			}
		}
1840
		drm_printf(m, "\t\tHW active? 0x%x\n", execlists->active);
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		rcu_read_unlock();
	} else if (INTEL_GEN(dev_priv) > 6) {
		drm_printf(m, "\tPP_DIR_BASE: 0x%08x\n",
			   I915_READ(RING_PP_DIR_BASE(engine)));
		drm_printf(m, "\tPP_DIR_BASE_READ: 0x%08x\n",
			   I915_READ(RING_PP_DIR_BASE_READ(engine)));
		drm_printf(m, "\tPP_DIR_DCLV: 0x%08x\n",
			   I915_READ(RING_PP_DIR_DCLV(engine)));
	}

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	spin_lock_irq(&engine->timeline->lock);
	list_for_each_entry(rq, &engine->timeline->requests, link)
		print_request(m, rq, "\t\tE ");
	for (rb = execlists->first; rb; rb = rb_next(rb)) {
		struct i915_priolist *p =
			rb_entry(rb, typeof(*p), node);

		list_for_each_entry(rq, &p->requests, priotree.link)
			print_request(m, rq, "\t\tQ ");
	}
	spin_unlock_irq(&engine->timeline->lock);

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	spin_lock_irq(&b->rb_lock);
	for (rb = rb_first(&b->waiters); rb; rb = rb_next(rb)) {
		struct intel_wait *w = rb_entry(rb, typeof(*w), node);

		drm_printf(m, "\t%s [%d] waiting for %x\n",
			   w->tsk->comm, w->tsk->pid, w->seqno);
	}
	spin_unlock_irq(&b->rb_lock);

1872
	drm_printf(m, "Idle? %s\n", yesno(intel_engine_is_idle(engine)));
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	drm_printf(m, "\n");
}

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#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/mock_engine.c"
#endif