Release 4.11 drivers/gpu/drm/i915/intel_lrc.c

/*
 * 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.
 *
 * Authors:
 *    Ben Widawsky <ben@bwidawsk.net>
 *    Michel Thierry <michel.thierry@intel.com>
 *    Thomas Daniel <thomas.daniel@intel.com>
 *    Oscar Mateo <oscar.mateo@intel.com>
 *
 */

/**
 * DOC: Logical Rings, Logical Ring Contexts and Execlists
 *
 * Motivation:
 * GEN8 brings an expansion of the HW contexts: "Logical Ring Contexts".
 * These expanded contexts enable a number of new abilities, especially
 * "Execlists" (also implemented in this file).
 *
 * One of the main differences with the legacy HW contexts is that logical
 * ring contexts incorporate many more things to the context's state, like
 * PDPs or ringbuffer control registers:
 *
 * The reason why PDPs are included in the context is straightforward: as
 * PPGTTs (per-process GTTs) are actually per-context, having the PDPs
 * contained there mean you don't need to do a ppgtt->switch_mm yourself,
 * instead, the GPU will do it for you on the context switch.
 *
 * But, what about the ringbuffer control registers (head, tail, etc..)?
 * shouldn't we just need a set of those per engine command streamer? This is
 * where the name "Logical Rings" starts to make sense: by virtualizing the
 * rings, the engine cs shifts to a new "ring buffer" with every context
 * switch. When you want to submit a workload to the GPU you: A) choose your
 * context, B) find its appropriate virtualized ring, C) write commands to it
 * and then, finally, D) tell the GPU to switch to that context.
 *
 * Instead of the legacy MI_SET_CONTEXT, the way you tell the GPU to switch
 * to a contexts is via a context execution list, ergo "Execlists".
 *
 * LRC implementation:
 * Regarding the creation of contexts, we have:
 *
 * - One global default context.
 * - One local default context for each opened fd.
 * - One local extra context for each context create ioctl call.
 *
 * Now that ringbuffers belong per-context (and not per-engine, like before)
 * and that contexts are uniquely tied to a given engine (and not reusable,
 * like before) we need:
 *
 * - One ringbuffer per-engine inside each context.
 * - One backing object per-engine inside each context.
 *
 * The global default context starts its life with these new objects fully
 * allocated and populated. The local default context for each opened fd is
 * more complex, because we don't know at creation time which engine is going
 * to use them. To handle this, we have implemented a deferred creation of LR
 * contexts:
 *
 * The local context starts its life as a hollow or blank holder, that only
 * gets populated for a given engine once we receive an execbuffer. If later
 * on we receive another execbuffer ioctl for the same context but a different
 * engine, we allocate/populate a new ringbuffer and context backing object and
 * so on.
 *
 * Finally, regarding local contexts created using the ioctl call: as they are
 * only allowed with the render ring, we can allocate & populate them right
 * away (no need to defer anything, at least for now).
 *
 * Execlists implementation:
 * Execlists are the new method by which, on gen8+ hardware, workloads are
 * submitted for execution (as opposed to the legacy, ringbuffer-based, method).
 * This method works as follows:
 *
 * When a request is committed, its commands (the BB start and any leading or
 * trailing commands, like the seqno breadcrumbs) are placed in the ringbuffer
 * for the appropriate context. The tail pointer in the hardware context is not
 * updated at this time, but instead, kept by the driver in the ringbuffer
 * structure. A structure representing this request is added to a request queue
 * for the appropriate engine: this structure contains a copy of the context's
 * tail after the request was written to the ring buffer and a pointer to the
 * context itself.
 *
 * If the engine's request queue was empty before the request was added, the
 * queue is processed immediately. Otherwise the queue will be processed during
 * a context switch interrupt. In any case, elements on the queue will get sent
 * (in pairs) to the GPU's ExecLists Submit Port (ELSP, for short) with a
 * globally unique 20-bits submission ID.
 *
 * When execution of a request completes, the GPU updates the context status
 * buffer with a context complete event and generates a context switch interrupt.
 * During the interrupt handling, the driver examines the events in the buffer:
 * for each context complete event, if the announced ID matches that on the head
 * of the request queue, then that request is retired and removed from the queue.
 *
 * After processing, if any requests were retired and the queue is not empty
 * then a new execution list can be submitted. The two requests at the front of
 * the queue are next to be submitted but since a context may not occur twice in
 * an execution list, if subsequent requests have the same ID as the first then
 * the two requests must be combined. This is done simply by discarding requests
 * at the head of the queue until either only one requests is left (in which case
 * we use a NULL second context) or the first two requests have unique IDs.
 *
 * By always executing the first two requests in the queue the driver ensures
 * that the GPU is kept as busy as possible. In the case where a single context
 * completes but a second context is still executing, the request for this second
 * context will be at the head of the queue when we remove the first one. This
 * request will then be resubmitted along with a new request for a different context,
 * which will cause the hardware to continue executing the second request and queue
 * the new request (the GPU detects the condition of a context getting preempted
 * with the same context and optimizes the context switch flow by not doing
 * preemption, but just sampling the new tail pointer).
 *
 */
#include <linux/interrupt.h>

#include <drm/drmP.h>
#include <drm/i915_drm.h>
#include "i915_drv.h"
#include "intel_mocs.h"


#define GEN9_LR_CONTEXT_RENDER_SIZE (22 * PAGE_SIZE)

#define GEN8_LR_CONTEXT_RENDER_SIZE (20 * PAGE_SIZE)

#define GEN8_LR_CONTEXT_OTHER_SIZE (2 * PAGE_SIZE)


#define RING_EXECLIST_QFULL		(1 << 0x2)

#define RING_EXECLIST1_VALID		(1 << 0x3)

#define RING_EXECLIST0_VALID		(1 << 0x4)

#define RING_EXECLIST_ACTIVE_STATUS	(3 << 0xE)

#define RING_EXECLIST1_ACTIVE		(1 << 0x11)

#define RING_EXECLIST0_ACTIVE		(1 << 0x12)


#define GEN8_CTX_STATUS_IDLE_ACTIVE	(1 << 0)

#define GEN8_CTX_STATUS_PREEMPTED	(1 << 1)

#define GEN8_CTX_STATUS_ELEMENT_SWITCH	(1 << 2)

#define GEN8_CTX_STATUS_ACTIVE_IDLE	(1 << 3)

#define GEN8_CTX_STATUS_COMPLETE	(1 << 4)

#define GEN8_CTX_STATUS_LITE_RESTORE	(1 << 15)


#define GEN8_CTX_STATUS_COMPLETED_MASK \
	 (GEN8_CTX_STATUS_ACTIVE_IDLE | \
          GEN8_CTX_STATUS_PREEMPTED | \
          GEN8_CTX_STATUS_ELEMENT_SWITCH)


#define CTX_LRI_HEADER_0		0x01

#define CTX_CONTEXT_CONTROL		0x02

#define CTX_RING_HEAD			0x04

#define CTX_RING_TAIL			0x06

#define CTX_RING_BUFFER_START		0x08

#define CTX_RING_BUFFER_CONTROL		0x0a

#define CTX_BB_HEAD_U			0x0c

#define CTX_BB_HEAD_L			0x0e

#define CTX_BB_STATE			0x10

#define CTX_SECOND_BB_HEAD_U		0x12

#define CTX_SECOND_BB_HEAD_L		0x14

#define CTX_SECOND_BB_STATE		0x16

#define CTX_BB_PER_CTX_PTR		0x18

#define CTX_RCS_INDIRECT_CTX		0x1a

#define CTX_RCS_INDIRECT_CTX_OFFSET	0x1c

#define CTX_LRI_HEADER_1		0x21

#define CTX_CTX_TIMESTAMP		0x22

#define CTX_PDP3_UDW			0x24

#define CTX_PDP3_LDW			0x26

#define CTX_PDP2_UDW			0x28

#define CTX_PDP2_LDW			0x2a

#define CTX_PDP1_UDW			0x2c

#define CTX_PDP1_LDW			0x2e

#define CTX_PDP0_UDW			0x30

#define CTX_PDP0_LDW			0x32

#define CTX_LRI_HEADER_2		0x41

#define CTX_R_PWR_CLK_STATE		0x42

#define CTX_GPGPU_CSR_BASE_ADDRESS	0x44


#define GEN8_CTX_VALID (1<<0)

#define GEN8_CTX_FORCE_PD_RESTORE (1<<1)

#define GEN8_CTX_FORCE_RESTORE (1<<2)

#define GEN8_CTX_L3LLC_COHERENT (1<<5)

#define GEN8_CTX_PRIVILEGE (1<<8)


#define ASSIGN_CTX_REG(reg_state, pos, reg, val) do { \
        (reg_state)[(pos)+0] = i915_mmio_reg_offset(reg); \
        (reg_state)[(pos)+1] = (val); \
} while (0)


#define ASSIGN_CTX_PDP(ppgtt, reg_state, n) do {            \
        const u64 _addr = i915_page_dir_dma_addr((ppgtt), (n)); \
        reg_state[CTX_PDP ## n ## _UDW+1] = upper_32_bits(_addr); \
        reg_state[CTX_PDP ## n ## _LDW+1] = lower_32_bits(_addr); \
} while (0)


#define ASSIGN_CTX_PML4(ppgtt, reg_state) do { \
        reg_state[CTX_PDP0_UDW + 1] = upper_32_bits(px_dma(&ppgtt->pml4)); \
        reg_state[CTX_PDP0_LDW + 1] = lower_32_bits(px_dma(&ppgtt->pml4)); \
} while (0)

enum {
	
FAULT_AND_HANG = 0,
	
FAULT_AND_HALT, /* Debug only */
	
FAULT_AND_STREAM,
	
FAULT_AND_CONTINUE /* Unsupported */
};

#define GEN8_CTX_ID_SHIFT 32

#define GEN8_CTX_ID_WIDTH 21

#define GEN8_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT	0x17

#define GEN9_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT	0x26

/* Typical size of the average request (2 pipecontrols and a MI_BB) */

#define EXECLISTS_REQUEST_SIZE 64 
/* bytes */


#define WA_TAIL_DWORDS 2

static int execlists_context_deferred_alloc(struct i915_gem_context *ctx,
					    struct intel_engine_cs *engine);
static void execlists_init_reg_state(u32 *reg_state,
				     struct i915_gem_context *ctx,
				     struct intel_engine_cs *engine,
				     struct intel_ring *ring);

/**
 * intel_sanitize_enable_execlists() - sanitize i915.enable_execlists
 * @dev_priv: i915 device private
 * @enable_execlists: value of i915.enable_execlists module parameter.
 *
 * Only certain platforms support Execlists (the prerequisites being
 * support for Logical Ring Contexts and Aliasing PPGTT or better).
 *
 * Return: 1 if Execlists is supported and has to be enabled.
 */


int intel_sanitize_enable_execlists(struct drm_i915_private *dev_priv, int enable_execlists)
{
	/* On platforms with execlist available, vGPU will only
         * support execlist mode, no ring buffer mode.
         */
	if (HAS_LOGICAL_RING_CONTEXTS(dev_priv) && intel_vgpu_active(dev_priv))
		return 1;

	if (INTEL_GEN(dev_priv) >= 9)
		return 1;

	if (enable_execlists == 0)
		return 0;

	if (HAS_LOGICAL_RING_CONTEXTS(dev_priv) &&
	    USES_PPGTT(dev_priv) &&
	    i915.use_mmio_flip >= 0)
		return 1;

	return 0;
}

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static void

logical_ring_init_platform_invariants(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;

	engine->disable_lite_restore_wa =
		IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1) &&
		(engine->id == VCS || engine->id == VCS2);

	engine->ctx_desc_template = GEN8_CTX_VALID;
	if (IS_GEN8(dev_priv))
		engine->ctx_desc_template |= GEN8_CTX_L3LLC_COHERENT;
	engine->ctx_desc_template |= GEN8_CTX_PRIVILEGE;

	/* TODO: WaDisableLiteRestore when we start using semaphore
         * signalling between Command Streamers */
	/* ring->ctx_desc_template |= GEN8_CTX_FORCE_RESTORE; */

	/* WaEnableForceRestoreInCtxtDescForVCS:skl */
	/* WaEnableForceRestoreInCtxtDescForVCS:bxt */
	if (engine->disable_lite_restore_wa)
		engine->ctx_desc_template |= GEN8_CTX_FORCE_RESTORE;
}

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/**
 * intel_lr_context_descriptor_update() - calculate & cache the descriptor
 *                                        descriptor for a pinned context
 * @ctx: Context to work on
 * @engine: Engine the descriptor will be used with
 *
 * The context descriptor encodes various attributes of a context,
 * including its GTT address and some flags. Because it's fairly
 * expensive to calculate, we'll just do it once and cache the result,
 * which remains valid until the context is unpinned.
 *
 * This is what a descriptor looks like, from LSB to MSB::
 *
 *      bits  0-11:    flags, GEN8_CTX_* (cached in ctx_desc_template)
 *      bits 12-31:    LRCA, GTT address of (the HWSP of) this context
 *      bits 32-52:    ctx ID, a globally unique tag
 *      bits 53-54:    mbz, reserved for use by hardware
 *      bits 55-63:    group ID, currently unused and set to 0
 */

static void

intel_lr_context_descriptor_update(struct i915_gem_context *ctx,
				   struct intel_engine_cs *engine)
{
	struct intel_context *ce = &ctx->engine[engine->id];
	u64 desc;

	BUILD_BUG_ON(MAX_CONTEXT_HW_ID > (1<<GEN8_CTX_ID_WIDTH));

	desc = ctx->desc_template;				/* bits  3-4  */
	desc |= engine->ctx_desc_template;			/* bits  0-11 */
	desc |= i915_ggtt_offset(ce->state) + LRC_PPHWSP_PN * PAGE_SIZE;
								/* bits 12-31 */
	desc |= (u64)ctx->hw_id << GEN8_CTX_ID_SHIFT;		/* bits 32-52 */

	ce->lrc_desc = desc;
}

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uint64_t intel_lr_context_descriptor(struct i915_gem_context *ctx,
				     struct intel_engine_cs *engine)
{
	return ctx->engine[engine->id].lrc_desc;
}

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static inline void

execlists_context_status_change(struct drm_i915_gem_request *rq,
				unsigned long status)
{
	/*
         * Only used when GVT-g is enabled now. When GVT-g is disabled,
         * The compiler should eliminate this function as dead-code.
         */
	if (!IS_ENABLED(CONFIG_DRM_I915_GVT))
		return;

	atomic_notifier_call_chain(&rq->engine->context_status_notifier,
				   status, rq);
}

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static void

execlists_update_context_pdps(struct i915_hw_ppgtt *ppgtt, u32 *reg_state)
{
	ASSIGN_CTX_PDP(ppgtt, reg_state, 3);
	ASSIGN_CTX_PDP(ppgtt, reg_state, 2);
	ASSIGN_CTX_PDP(ppgtt, reg_state, 1);
	ASSIGN_CTX_PDP(ppgtt, reg_state, 0);
}

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static u64 execlists_update_context(struct drm_i915_gem_request *rq)
{
	struct intel_context *ce = &rq->ctx->engine[rq->engine->id];
	struct i915_hw_ppgtt *ppgtt =
		rq->ctx->ppgtt ?: rq->i915->mm.aliasing_ppgtt;
	u32 *reg_state = ce->lrc_reg_state;

	reg_state[CTX_RING_TAIL+1] = rq->tail;

	/* True 32b PPGTT with dynamic page allocation: update PDP
         * registers and point the unallocated PDPs to scratch page.
         * PML4 is allocated during ppgtt init, so this is not needed
         * in 48-bit mode.
         */
	if (ppgtt && !USES_FULL_48BIT_PPGTT(ppgtt->base.dev))
		execlists_update_context_pdps(ppgtt, reg_state);

	return ce->lrc_desc;
}

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static void execlists_submit_ports(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	struct execlist_port *port = engine->execlist_port;
	u32 __iomem *elsp =
		dev_priv->regs + i915_mmio_reg_offset(RING_ELSP(engine));
	u64 desc[2];

	if (!port[0].count)
		execlists_context_status_change(port[0].request,
						INTEL_CONTEXT_SCHEDULE_IN);
	desc[0] = execlists_update_context(port[0].request);
	engine->preempt_wa = port[0].count++; /* bdw only? fixed on skl? */

	if (port[1].request) {
		GEM_BUG_ON(port[1].count);
		execlists_context_status_change(port[1].request,
						INTEL_CONTEXT_SCHEDULE_IN);
		desc[1] = execlists_update_context(port[1].request);
		port[1].count = 1;
	} else {
		desc[1] = 0;
	}
	GEM_BUG_ON(desc[0] == desc[1]);

	/* You must always write both descriptors in the order below. */
	writel(upper_32_bits(desc[1]), elsp);
	writel(lower_32_bits(desc[1]), elsp);

	writel(upper_32_bits(desc[0]), elsp);
	/* The context is automatically loaded after the following */
	writel(lower_32_bits(desc[0]), elsp);
}

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static bool ctx_single_port_submission(const struct i915_gem_context *ctx)
{
	return (IS_ENABLED(CONFIG_DRM_I915_GVT) &&
		i915_gem_context_force_single_submission(ctx));
}

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static bool can_merge_ctx(const struct i915_gem_context *prev,
			  const struct i915_gem_context *next)
{
	if (prev != next)
		return false;

	if (ctx_single_port_submission(prev))
		return false;

	return true;
}

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static void execlists_dequeue(struct intel_engine_cs *engine)
{
	struct drm_i915_gem_request *last;
	struct execlist_port *port = engine->execlist_port;
	unsigned long flags;
	struct rb_node *rb;
	bool submit = false;

	last = port->request;
	if (last)
		/* WaIdleLiteRestore:bdw,skl
                 * Apply the wa NOOPs to prevent ring:HEAD == req:TAIL
                 * as we resubmit the request. See gen8_emit_breadcrumb()
                 * for where we prepare the padding after the end of the
                 * request.
                 */
		last->tail = last->wa_tail;

	GEM_BUG_ON(port[1].request);

	/* Hardware submission is through 2 ports. Conceptually each port
         * has a (RING_START, RING_HEAD, RING_TAIL) tuple. RING_START is
         * static for a context, and unique to each, so we only execute
         * requests belonging to a single context from each ring. RING_HEAD
         * is maintained by the CS in the context image, it marks the place
         * where it got up to last time, and through RING_TAIL we tell the CS
         * where we want to execute up to this time.
         *
         * In this list the requests are in order of execution. Consecutive
         * requests from the same context are adjacent in the ringbuffer. We
         * can combine these requests into a single RING_TAIL update:
         *
         *              RING_HEAD...req1...req2
         *                                    ^- RING_TAIL
         * since to execute req2 the CS must first execute req1.
         *
         * Our goal then is to point each port to the end of a consecutive
         * sequence of requests as being the most optimal (fewest wake ups
         * and context switches) submission.
         */

	spin_lock_irqsave(&engine->timeline->lock, flags);
	rb = engine->execlist_first;
	while (rb) {
		struct drm_i915_gem_request *cursor =
			rb_entry(rb, typeof(*cursor), priotree.node);

		/* Can we combine this request with the current port? It has to
                 * be the same context/ringbuffer and not have any exceptions
                 * (e.g. GVT saying never to combine contexts).
                 *
                 * If we can combine the requests, we can execute both by
                 * updating the RING_TAIL to point to the end of the second
                 * request, and so we never need to tell the hardware about
                 * the first.
                 */
		if (last && !can_merge_ctx(cursor->ctx, last->ctx)) {
			/* If we are on the second port and cannot combine
                         * this request with the last, then we are done.
                         */
			if (port != engine->execlist_port)
				break;

			/* If GVT overrides us we only ever submit port[0],
                         * leaving port[1] empty. Note that we also have
                         * to be careful that we don't queue the same
                         * context (even though a different request) to
                         * the second port.
                         */
			if (ctx_single_port_submission(last->ctx) ||
			    ctx_single_port_submission(cursor->ctx))
				break;

			GEM_BUG_ON(last->ctx == cursor->ctx);

			i915_gem_request_assign(&port->request, last);
			port++;
		}

		rb = rb_next(rb);
		rb_erase(&cursor->priotree.node, &engine->execlist_queue);
		RB_CLEAR_NODE(&cursor->priotree.node);
		cursor->priotree.priority = INT_MAX;

		__i915_gem_request_submit(cursor);
		last = cursor;
		submit = true;
	}
	if (submit) {
		i915_gem_request_assign(&port->request, last);
		engine->execlist_first = rb;
	}
	spin_unlock_irqrestore(&engine->timeline->lock, flags);

	if (submit)
		execlists_submit_ports(engine);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
208
74.29%
4
26.67%
Thomas Daniel
40
14.29%
2
13.33%
Tvrtko A. Ursulin
12
4.29%
3
20.00%
Zhi Wang
8
2.86%
2
13.33%
Min He
7
2.50%
1
6.67%
Oscar Mateo
3
1.07%
1
6.67%
Peter Antoine
1
0.36%
1
6.67%
Nick Hoath
1
0.36%
1
6.67%
Total
280
100.00%
15
100.00%



static bool execlists_elsp_idle(struct intel_engine_cs *engine)
{
	return !engine->execlist_port[0].request;
}

Contributors
Person
Tokens
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Commits
CommitProp
Chris Wilson
14
63.64%
1
33.33%
Thomas Daniel
7
31.82%
1
33.33%
Tvrtko A. Ursulin
1
4.55%
1
33.33%
Total
22
100.00%
3
100.00%

/**
 * intel_execlists_idle() - Determine if all engine submission ports are idle
 * @dev_priv: i915 device private
 *
 * Return true if there are no requests pending on any of the submission ports
 * of any engines.
 */


bool intel_execlists_idle(struct drm_i915_private *dev_priv)
{
	struct intel_engine_cs *engine;
	enum intel_engine_id id;

	if (!i915.enable_execlists)
		return true;

	for_each_engine(engine, dev_priv, id)
		if (!execlists_elsp_idle(engine))
			return false;

	return true;
}

Contributors
Person
Tokens
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CommitProp
Imre Deak
51
100.00%
1
100.00%
Total
51
100.00%
1
100.00%



static bool execlists_elsp_ready(struct intel_engine_cs *engine)
{
	int port;

	port = 1; /* wait for a free slot */
	if (engine->disable_lite_restore_wa || engine->preempt_wa)
		port = 0; /* wait for GPU to be idle before continuing */

	return !engine->execlist_port[port].request;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
28
62.22%
1
14.29%
Thomas Daniel
9
20.00%
1
14.29%
Tvrtko A. Ursulin
6
13.33%
4
57.14%
Ben Widawsky
2
4.44%
1
14.29%
Total
45
100.00%
7
100.00%

/*
 * Check the unread Context Status Buffers and manage the submission of new
 * contexts to the ELSP accordingly.
 */


static void intel_lrc_irq_handler(unsigned long data)
{
	struct intel_engine_cs *engine = (struct intel_engine_cs *)data;
	struct execlist_port *port = engine->execlist_port;
	struct drm_i915_private *dev_priv = engine->i915;

	intel_uncore_forcewake_get(dev_priv, engine->fw_domains);

	if (!execlists_elsp_idle(engine)) {
		u32 __iomem *csb_mmio =
			dev_priv->regs + i915_mmio_reg_offset(RING_CONTEXT_STATUS_PTR(engine));
		u32 __iomem *buf =
			dev_priv->regs + i915_mmio_reg_offset(RING_CONTEXT_STATUS_BUF_LO(engine, 0));
		unsigned int csb, head, tail;

		csb = readl(csb_mmio);
		head = GEN8_CSB_READ_PTR(csb);
		tail = GEN8_CSB_WRITE_PTR(csb);
		if (tail < head)
			tail += GEN8_CSB_ENTRIES;
		while (head < tail) {
			unsigned int idx = ++head % GEN8_CSB_ENTRIES;
			unsigned int status = readl(buf + 2 * idx);

			if (!(status & GEN8_CTX_STATUS_COMPLETED_MASK))
				continue;

			GEM_BUG_ON(port[0].count == 0);
			if (--port[0].count == 0) {
				GEM_BUG_ON(status & GEN8_CTX_STATUS_PREEMPTED);
				execlists_context_status_change(port[0].request,
								INTEL_CONTEXT_SCHEDULE_OUT);

				i915_gem_request_put(port[0].request);
				port[0] = port[1];
				memset(&port[1], 0, sizeof(port[1]));

				engine->preempt_wa = false;
			}

			GEM_BUG_ON(port[0].count == 0 &&
				   !(status & GEN8_CTX_STATUS_ACTIVE_IDLE));
		}

		writel(_MASKED_FIELD(GEN8_CSB_READ_PTR_MASK,
				     GEN8_CSB_WRITE_PTR(csb) << 8),
		       csb_mmio);
	}

	if (execlists_elsp_ready(engine))
		execlists_dequeue(engine);

	intel_uncore_forcewake_put(dev_priv, engine->fw_domains);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
196
61.06%
2
13.33%
Tvrtko A. Ursulin
64
19.94%
5
33.33%
Thomas Daniel
34
10.59%
1
6.67%
Oscar Mateo
14
4.36%
2
13.33%
Ben Widawsky
7
2.18%
2
13.33%
Michel Thierry
5
1.56%
2
13.33%
Daniel Vetter
1
0.31%
1
6.67%
Total
321
100.00%
15
100.00%



static bool insert_request(struct i915_priotree *pt, struct rb_root *root)
{
	struct rb_node **p, *rb;
	bool first = true;

	/* most positive priority is scheduled first, equal priorities fifo */
	rb = NULL;
	p = &root->rb_node;
	while (*p) {
		struct i915_priotree *pos;

		rb = *p;
		pos = rb_entry(rb, typeof(*pos), node);
		if (pt->priority > pos->priority) {
			p = &rb->rb_left;
		} else {
			p = &rb->rb_right;
			first = false;
		}
	}
	rb_link_node(&pt->node, rb, p);
	rb_insert_color(&pt->node, root);

	return first;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
132
100.00%
1
100.00%
Total
132
100.00%
1
100.00%



static void execlists_submit_request(struct drm_i915_gem_request *request)
{
	struct intel_engine_cs *engine = request->engine;
	unsigned long flags;

	/* Will be called from irq-context when using foreign fences. */
	spin_lock_irqsave(&engine->timeline->lock, flags);

	if (insert_request(&request->priotree, &engine->execlist_queue))
		engine->execlist_first = &request->priotree.node;
	if (execlists_elsp_idle(engine))
		tasklet_hi_schedule(&engine->irq_tasklet);

	spin_unlock_irqrestore(&engine->timeline->lock, flags);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
50
55.56%
6
42.86%
Michel Thierry
18
20.00%
1
7.14%
Tvrtko A. Ursulin
8
8.89%
4
28.57%
John Harrison
6
6.67%
1
7.14%
Oscar Mateo
5
5.56%
1
7.14%
Nick Hoath
3
3.33%
1
7.14%
Total
90
100.00%
14
100.00%


static struct intel_engine_cs *

pt_lock_engine(struct i915_priotree *pt, struct intel_engine_cs *locked)
{
	struct intel_engine_cs *engine =
		container_of(pt, struct drm_i915_gem_request, priotree)->engine;

	GEM_BUG_ON(!locked);

	if (engine != locked) {
		spin_unlock(&locked->timeline->lock);
		spin_lock(&engine->timeline->lock);
	}

	return engine;
}

Contributors
Person
Tokens
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CommitProp
Chris Wilson
72
100.00%
2
100.00%
Total
72
100.00%
2
100.00%



static void execlists_schedule(struct drm_i915_gem_request *request, int prio)
{
	struct intel_engine_cs *engine;
	struct i915_dependency *dep, *p;
	struct i915_dependency stack;
	LIST_HEAD(dfs);

	if (prio <= READ_ONCE(request->priotree.priority))
		return;

	/* Need BKL in order to use the temporary link inside i915_dependency */
	lockdep_assert_held(&request->i915->drm.struct_mutex);

	stack.signaler = &request->priotree;
	list_add(&stack.dfs_link, &dfs);

	/* Recursively bump all dependent priorities to match the new request.
         *
         * A naive approach would be to use recursion:
         * static void update_priorities(struct i915_priotree *pt, prio) {
         *      list_for_each_entry(dep, &pt->signalers_list, signal_link)
         *              update_priorities(dep->signal, prio)
         *      insert_request(pt);
         * }
         * but that may have unlimited recursion depth and so runs a very
         * real risk of overunning the kernel stack. Instead, we build
         * a flat list of all dependencies starting with the current request.
         * As we walk the list of dependencies, we add all of its dependencies
         * to the end of the list (this may include an already visited
         * request) and continue to walk onwards onto the new dependencies. The
         * end result is a topological list of requests in reverse order, the
         * last element in the list is the request we must execute first.
         */
	list_for_each_entry_safe(dep, p, &dfs, dfs_link) {
		struct i915_priotree *pt = dep->signaler;

		/* Within an engine, there can be no cycle, but we may
                 * refer to the same dependency chain multiple times
                 * (redundant dependencies are not eliminated) and across
                 * engines.
                 */
		list_for_each_entry(p, &pt->signalers_list, signal_link) {
			GEM_BUG_ON(p->signaler->priority < pt->priority);
			if (prio > READ_ONCE(p->signaler->priority))
				list_move_tail(&p->dfs_link, &dfs);
		}

		list_safe_reset_next(dep, p, dfs_link);
	}

	engine = request->engine;
	spin_lock_irq(&engine->timeline->lock);

	/* Fifo and depth-first replacement ensure our deps execute before us */
	list_for_each_entry_safe_reverse(dep, p, &dfs, dfs_link) {
		struct i915_priotree *pt = dep->signaler;

		INIT_LIST_HEAD(&dep->dfs_link);

		engine = pt_lock_engine(pt, engine);

		if (prio <= pt->priority)
			continue;

		pt->priority = prio;
		if (!RB_EMPTY_NODE(&pt->node)) {
			rb_erase(&pt->node, &engine->execlist_queue);
			if (insert_request(pt, &engine->execlist_queue))
				engine->execlist_first = &pt->node;
		}
	}

	spin_unlock_irq(&engine->timeline->lock);

	/* XXX Do we need to preempt to make room for us and our deps? */
}

Contributors
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Chris Wilson
290
100.00%
4
100.00%
Total
290
100.00%
4
100.00%



static int execlists_context_pin(struct intel_engine_cs *engine,
				 struct i915_gem_context *ctx)
{
	struct intel_context *ce = &ctx->engine[engine->id];
	unsigned int flags;
	void *vaddr;
	int ret;

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

	if (ce->pin_count++)
		return 0;

	if (!ce->state) {
		ret = execlists_context_deferred_alloc(ctx, engine);
		if (ret)
			goto err;
	}
	GEM_BUG_ON(!ce->state);

	flags = PIN_GLOBAL;
	if (ctx->ggtt_offset_bias)
		flags |= PIN_OFFSET_BIAS | ctx->ggtt_offset_bias;
	if (i915_gem_context_is_kernel(ctx))
		flags |= PIN_HIGH;

	ret = i915_vma_pin(ce->state, 0, GEN8_LR_CONTEXT_ALIGN, flags);
	if (ret)
		goto err;

	vaddr = i915_gem_object_pin_map(ce->state->obj, I915_MAP_WB);
	if (IS_ERR(vaddr)) {
		ret = PTR_ERR(vaddr);
		goto unpin_vma;
	}

	ret = intel_ring_pin(ce->ring, ctx->ggtt_offset_bias);
	if (ret)
		goto unpin_map;

	intel_lr_context_descriptor_update(ctx, engine);

	ce->lrc_reg_state = vaddr + LRC_STATE_PN * PAGE_SIZE;
	ce->lrc_reg_state[CTX_RING_BUFFER_START+1] =
		i915_ggtt_offset(ce->ring->vma);

	ce->state->obj->mm.dirty = true;

	i915_gem_context_get(ctx);
	return 0;

unpin_map:
	i915_gem_object_unpin_map(ce->state->obj);
unpin_vma:
	__i915_vma_unpin(ce->state);
err:
	ce->pin_count = 0;
	return ret;
}

Contributors
Person
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Commits
CommitProp
Chris Wilson
156
54.55%
17
58.62%
Tvrtko A. Ursulin
55
19.23%
5
17.24%
Oscar Mateo
36
12.59%
1
3.45%
Daniele Ceraolo Spurio
17
5.94%
2
6.90%
John Harrison
13
4.55%
1
3.45%
Nick Hoath
7
2.45%
2
6.90%
Mika Kuoppala
2
0.70%
1
3.45%
Total
286
100.00%
29
100.00%



static void execlists_context_unpin(struct intel_engine_cs *engine,
				    struct i915_gem_context *ctx)
{
	struct intel_context *ce = &ctx->engine[engine->id];

	lockdep_assert_held(&ctx->i915->drm.struct_mutex);
	GEM_BUG_ON(ce->pin_count == 0);

	if (--ce->pin_count)
		return;

	intel_ring_unpin(ce->ring);

	i915_gem_object_unpin_map(ce->state->obj);
	i915_vma_unpin(ce->state);

	i915_gem_context_put(ctx);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
48
54.55%
8
50.00%
John Harrison
13
14.77%
1
6.25%
Oscar Mateo
12
13.64%
1
6.25%
Tvrtko A. Ursulin
11
12.50%
3
18.75%
Daniel Vetter
2
2.27%
1
6.25%
Mika Kuoppala
1
1.14%
1
6.25%
Nick Hoath
1
1.14%
1
6.25%
Total
88
100.00%
16
100.00%



static int execlists_request_alloc(struct drm_i915_gem_request *request)
{
	struct intel_engine_cs *engine = request->engine;
	struct intel_context *ce = &request->ctx->engine[engine->id];
	int ret;

	GEM_BUG_ON(!ce->pin_count);

	/* Flush enough space to reduce the likelihood of waiting after
         * we start building the request - in which case we will just
         * have to repeat work.
         */
	request->reserved_space += EXECLISTS_REQUEST_SIZE;

	GEM_BUG_ON(!ce->ring);
	request->ring = ce->ring;

	if (i915.enable_guc_submission) {
		/*
                 * Check that the GuC has space for the request before
                 * going any further, as the i915_add_request() call
                 * later on mustn't fail ...
                 */
		ret = i915_guc_wq_reserve(request);
		if (ret)
			goto err;
	}

	ret = intel_ring_begin(request, 0);
	if (ret)
		goto err_unreserve;

	if (!ce->initialised) {
		ret = engine->init_context(request);
		if (ret)
			goto err_unreserve;

		ce->initialised = true;
	}

	/* Note that after this point, we have committed to using
         * this request as it is being used to both track the
         * state of engine initialisation and liveness of the
         * golden renderstate above. Think twice before you try
         * to cancel/unwind this request now.
         */

	request->reserved_space -= EXECLISTS_REQUEST_SIZE;
	return 0;

err_unreserve:
	if (i915.enable_guc_submission)
		i915_guc_wq_unreserve(request);
err:
	return ret;
}

Contributors
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Chris Wilson
169
100.00%
3
100.00%
Total
169
100.00%
3
100.00%



static int intel_logical_ring_workarounds_emit(struct drm_i915_gem_request *req)
{
	int ret, i;
	struct intel_ring *ring = req->ring;
	struct i915_workarounds *w = &req->i915->workarounds;

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

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

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

	intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(w->count));
	for (i = 0; i < w->count; i++) {
		intel_ring_emit_reg(ring, w->reg[i].addr);
		intel_ring_emit(ring, w->reg[i].value);
	}
	intel_ring_emit(ring, MI_NOOP);

	intel_ring_advance(ring);

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

	return 0;
}

Contributors
Person
Tokens
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Commits
CommitProp
Michel Thierry
142
78.02%
1
10.00%
Chris Wilson
31
17.03%
7
70.00%
John Harrison
8
4.40%
1
10.00%
Nick Hoath
1
0.55%
1
10.00%
Total
182
100.00%
10
100.00%


#define wa_ctx_emit(batch, index, cmd)					\
	do {                                                            \
                int __index = (index)++;                                \
                if (WARN_ON(__index >= (PAGE_SIZE / sizeof(uint32_t)))) { \
                        return -ENOSPC;                                 \
                }                                                       \
                batch[__index] = (cmd);                                 \
        } while (0)


#define wa_ctx_emit_reg(batch, index, reg) \
	wa_ctx_emit((batch), (index), i915_mmio_reg_offset(reg))

/*
 * In this WA we need to set GEN8_L3SQCREG4[21:21] and reset it after
 * PIPE_CONTROL instruction. This is required for the flush to happen correctly
 * but there is a slight complication as this is applied in WA batch where the
 * values are only initialized once so we cannot take register value at the
 * beginning and reuse it further; hence we save its value to memory, upload a
 * constant value with bit21 set and then we restore it back with the saved value.
 * To simplify the WA, a constant value is formed by using the default value
 * of this register. This shouldn't be a problem because we are only modifying
 * it for a short period and this batch in non-premptible. We can ofcourse
 * use additional instructions that read the actual value of the register
 * at that time and set our bit of interest but it makes the WA complicated.
 *
 * This WA is also required for Gen9 so extracting as a function avoids
 * code duplication.
 */


static inline int gen8_emit_flush_coherentl3_wa(struct intel_engine_cs *engine,
						uint32_t *batch,
						uint32_t index)
{
	uint32_t l3sqc4_flush = (0x40400000 | GEN8_LQSC_FLUSH_COHERENT_LINES);

	wa_ctx_emit(batch, index, (MI_STORE_REGISTER_MEM_GEN8 |
				   MI_SRM_LRM_GLOBAL_GTT));
	wa_ctx_emit_reg(batch, index, GEN8_L3SQCREG4);
	wa_ctx_emit(batch, index, i915_ggtt_offset(engine->scratch) + 256);
	wa_ctx_emit(batch, index, 0);

	wa_ctx_emit(batch, index, MI_LOAD_REGISTER_IMM(1));
	wa_ctx_emit_reg(batch, index, GEN8_L3SQCREG4);
	wa_ctx_emit(batch, index, l3sqc4_flush);

	wa_ctx_emit(batch, index, GFX_OP_PIPE_CONTROL(6));
	wa_ctx_emit(batch, index, (PIPE_CONTROL_CS_STALL |
				   PIPE_CONTROL_DC_FLUSH_ENABLE));
	wa_ctx_emit(batch, index, 0);
	wa_ctx_emit(batch, index, 0);
	wa_ctx_emit(batch, index, 0);
	wa_ctx_emit(batch, index, 0);

	wa_ctx_emit(batch, index, (MI_LOAD_REGISTER_MEM_GEN8 |
				   MI_SRM_LRM_GLOBAL_GTT));
	wa_ctx_emit_reg(batch, index, GEN8_L3SQCREG4);
	wa_ctx_emit(batch, index, i915_ggtt_offset(engine->scratch) + 256);
	wa_ctx_emit(batch, index, 0);

	return index;
}

Contributors
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CommitProp
Arun Siluvery
204
94.44%
2
40.00%
Chris Wilson
6
2.78%
1
20.00%
Ville Syrjälä
3
1.39%
1
20.00%
Tvrtko A. Ursulin
3
1.39%
1
20.00%
Total
216
100.00%
5
100.00%



static inline uint32_t wa_ctx_start(struct i915_wa_ctx_bb *wa_ctx,
				    uint32_t offset,
				    uint32_t start_alignment)
{
	return wa_ctx->offset = ALIGN(offset, start_alignment);
}

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Arun Siluvery
20
66.67%
1
33.33%
Oscar Mateo
10
33.33%
2
66.67%
Total
30
100.00%
3
100.00%



static inline int wa_ctx_end(struct i915_wa_ctx_bb *wa_ctx,
			     uint32_t offset,
			     uint32_t size_alignment)
{
	wa_ctx->size = offset - wa_ctx->offset;

	WARN(wa_ctx->size % size_alignment,
	     "wa_ctx_bb failed sanity checks: size %d is not aligned to %d\n",
	     wa_ctx->size, size_alignment);
	return 0;
}

Contributors
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CommitProp
Arun Siluvery
33
68.75%
1
33.33%
Oscar Mateo
13
27.08%
1
33.33%
Thomas Daniel
2
4.17%
1
33.33%
Total
48
100.00%
3
100.00%

/*
 * Typically we only have one indirect_ctx and per_ctx batch buffer which are
 * initialized at the beginning and shared across all contexts but this field
 * helps us to have multiple batches at different offsets and select them based
 * on a criteria. At the moment this batch always start at the beginning of the page
 * and at this point we don't have multiple wa_ctx batch buffers.
 *
 * The number of WA applied are not known at the beginning; we use this field
 * to return the no of DWORDS written.
 *
 * It is to be noted that this batch does not contain MI_BATCH_BUFFER_END
 * so it adds NOOPs as padding to make it cacheline aligned.
 * MI_BATCH_BUFFER_END will be added to perctx batch and both of them together
 * makes a complete batch buffer.
 */


static int gen8_init_indirectctx_bb(struct intel_engine_cs *engine,
				    struct i915_wa_ctx_bb *wa_ctx,
				    uint32_t *batch,
				    uint32_t *offset)
{
	uint32_t scratch_addr;
	uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);

	/* WaDisableCtxRestoreArbitration:bdw,chv */
	wa_ctx_emit(batch, index, MI_ARB_ON_OFF | MI_ARB_DISABLE);

	/* WaFlushCoherentL3CacheLinesAtContextSwitch:bdw */
	if (IS_BROADWELL(engine->i915)) {
		int rc = gen8_emit_flush_coherentl3_wa(engine, batch, index);
		if (rc < 0)
			return rc;
		index = rc;
	}

	/* WaClearSlmSpaceAtContextSwitch:bdw,chv */
	/* Actual scratch location is at 128 bytes offset */
	scratch_addr = i915_ggtt_offset(engine->scratch) + 2 * CACHELINE_BYTES;

	wa_ctx_emit(batch, index, GFX_OP_PIPE_CONTROL(6));
	wa_ctx_emit(batch, index, (PIPE_CONTROL_FLUSH_L3 |
				   PIPE_CONTROL_GLOBAL_GTT_IVB |
				   PIPE_CONTROL_CS_STALL |
				   PIPE_CONTROL_QW_WRITE));
	wa_ctx_emit(batch, index, scratch_addr);
	wa_ctx_emit(batch, index, 0);
	wa_ctx_emit(batch, index, 0);
	wa_ctx_emit(batch, index, 0);

	/* Pad to end of cacheline */
	while (index % CACHELINE_DWORDS)
		wa_ctx_emit(batch, index, MI_NOOP);

	/*
         * MI_BATCH_BUFFER_END is not required in Indirect ctx BB because
         * execution depends on the length specified in terms of cache lines
         * in the register CTX_RCS_INDIRECT_CTX
         */

	return wa_ctx_end(wa_ctx, *offset = index, CACHELINE_DWORDS);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Arun Siluvery
156
78.39%
6
50.00%
Oscar Mateo
23
11.56%
1
8.33%
Andrzej Hajda
10
5.03%
1
8.33%
Tvrtko A. Ursulin
4
2.01%
1
8.33%
Chris Wilson
4
2.01%
2
16.67%
Michel Thierry
2
1.01%
1
8.33%
Total
199
100.00%
12
100.00%

/*
 *  This batch is started immediately after indirect_ctx batch. Since we ensure
 *  that indirect_ctx ends on a cacheline this batch is aligned automatically.
 *
 *  The number of DWORDS written are returned using this field.
 *
 *  This batch is terminated with MI_BATCH_BUFFER_END and so we need not add padding
 *  to align it with cacheline as padding after MI_BATCH_BUFFER_END is redundant.
 */


static int gen8_init_perctx_bb(struct intel_engine_cs *engine,
			       struct i915_wa_ctx_bb *wa_ctx,
			       uint32_t *batch,
			       uint32_t *offset)
{
	uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);

	/* WaDisableCtxRestoreArbitration:bdw,chv */
	wa_ctx_emit(batch, index, MI_ARB_ON_OFF | MI_ARB_ENABLE);

	wa_ctx_emit(batch, index, MI_BATCH_BUFFER_END);

	return wa_ctx_end(wa_ctx, *offset = index, 1);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Arun Siluvery
57
80.28%
3
60.00%
Damien Lespiau
13
18.31%
1
20.00%
Tvrtko A. Ursulin
1
1.41%
1
20.00%
Total
71
100.00%
5
100.00%



static int gen9_init_indirectctx_bb(struct intel_engine_cs *engine,
				    struct i915_wa_ctx_bb *wa_ctx,
				    uint32_t *batch,
				    uint32_t *offset)
{
	int ret;
	struct drm_i915_private *dev_priv = engine->i915;
	uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);

	/* WaDisableCtxRestoreArbitration:bxt */
	if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1))
		wa_ctx_emit(batch, index, MI_ARB_ON_OFF | MI_ARB_DISABLE);

	/* WaFlushCoherentL3CacheLinesAtContextSwitch:skl,bxt */
	ret = gen8_emit_flush_coherentl3_wa(engine, batch, index);
	if (ret < 0)
		return ret;
	index = ret;

	/* WaDisableGatherAtSetShaderCommonSlice:skl,bxt,kbl */
	wa_ctx_emit(batch, index, MI_LOAD_REGISTER_IMM(1));
	wa_ctx_emit_reg(batch, index, COMMON_SLICE_CHICKEN2);
	wa_ctx_emit(batch, index, _MASKED_BIT_DISABLE(
			    GEN9_DISABLE_GATHER_AT_SET_SHADER_COMMON_SLICE));
	wa_ctx_emit(batch, index, MI_NOOP);

	/* WaClearSlmSpaceAtContextSwitch:kbl */
	/* Actual scratch location is at 128 bytes offset */
	if (IS_KBL_REVID(dev_priv, 0, KBL_REVID_A0)) {
		u32 scratch_addr =
			i915_ggtt_offset(engine->scratch) + 2 * CACHELINE_BYTES;

		wa_ctx_emit(batch, index, GFX_OP_PIPE_CONTROL(6));
		wa_ctx_emit(batch, index, (PIPE_CONTROL_FLUSH_L3 |
					   PIPE_CONTROL_GLOBAL_GTT_IVB |
					   PIPE_CONTROL_CS_STALL |
					   PIPE_CONTROL_QW_WRITE));
		wa_ctx_emit(batch, index, scratch_addr);
		wa_ctx_emit(batch, index, 0);
		wa_ctx_emit(batch, index, 0);
		wa_ctx_emit(batch, index, 0);
	}

	/* WaMediaPoolStateCmdInWABB:bxt */
	if (HAS_POOLED_EU(engine->i915)) {
		/*
                 * EU pool configuration is setup along with golden context
                 * during context initialization. This value depends on
                 * device type (2x6 or 3x6) and needs to be updated based
                 * on which subslice is disabled especially for 2x6
                 * devices, however it is safe to load default
                 * configuration of 3x6 device instead of masking off
                 * corresponding bits because HW ignores bits of a disabled
                 * subslice and drops down to appropriate config. Please
                 * see render_state_setup() in i915_gem_render_state.c for
                 * possible configurations, to avoid duplication they are
                 * not shown here again.
                 */
		u32 eu_pool_config = 0x00777000;
		wa_ctx_emit(batch, index, GEN9_MEDIA_POOL_STATE);
		wa_ctx_emit(batch, index, GEN9_MEDIA_POOL_ENABLE);
		wa_ctx_emit(batch, index, eu_pool_config);
		wa_ctx_emit(batch, index, 0);
		wa_ctx_emit(batch, index, 0);
		wa_ctx_emit(batch, index, 0);
	}

	/* Pad to end of cacheline */
	while (index % CACHELINE_DWORDS)
		wa_ctx_emit(batch, index, MI_NOOP);

	return wa_ctx_end(wa_ctx, *offset = index, CACHELINE_DWORDS);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mika Kuoppala
139
41.49%
3
21.43%
Arun Siluvery
108
32.24%
3
21.43%
Tim Gore
73
21.79%
2
14.29%
Jani Nikula
6
1.79%
2
14.29%
Chris Wilson
4
1.19%
2
14.29%
Dave Airlie
3
0.90%
1
7.14%
Tvrtko A. Ursulin
2
0.60%
1
7.14%
Total
335
100.00%
14
100.00%



static int gen9_init_perctx_bb(struct intel_engine_cs *engine,
			       struct i915_wa_ctx_bb *wa_ctx,
			       uint32_t *batch,
			       uint32_t *offset)
{
	uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);

	/* WaSetDisablePixMaskCammingAndRhwoInCommonSliceChicken:bxt */
	if (IS_BXT_REVID(engine->i915, 0, BXT_REVID_A1)) {
		wa_ctx_emit(batch, index, MI_LOAD_REGISTER_IMM(1));
		wa_ctx_emit_reg(batch, index, GEN9_SLICE_COMMON_ECO_CHICKEN0);
		wa_ctx_emit(batch, index,
			    _MASKED_BIT_ENABLE(DISABLE_PIXEL_MASK_CAMMING));
		wa_ctx_emit(batch, index, MI_NOOP);
	}

	/* WaClearTdlStateAckDirtyBits:bxt */
	if (IS_BXT_REVID(engine->i915, 0, BXT_REVID_B0)) {
		wa_ctx_emit(batch, index, MI_LOAD_REGISTER_IMM(4));

		wa_ctx_emit_reg(batch, index, GEN8_STATE_ACK);
		wa_ctx_emit(batch, index, _MASKED_BIT_DISABLE(GEN9_SUBSLICE_TDL_ACK_BITS));

		wa_ctx_emit_reg(batch, index, GEN9_STATE_ACK_SLICE1);
		wa_ctx_emit(batch, index, _MASKED_BIT_DISABLE(GEN9_SUBSLICE_TDL_ACK_BITS));

		wa_ctx_emit_reg(batch, index, GEN9_STATE_ACK_SLICE2);
		wa_ctx_emit(batch, index, _MASKED_BIT_DISABLE(GEN9_SUBSLICE_TDL_ACK_BITS));

		wa_ctx_emit_reg(batch, index, GEN7_ROW_CHICKEN2);
		/* dummy write to CS, mask bits are 0 to ensure the register is not modified */
		wa_ctx_emit(batch, index, 0x0);
		wa_ctx_emit(batch, index, MI_NOOP);
	}

	/* WaDisableCtxRestoreArbitration:bxt */
	if (IS_BXT_REVID(engine->i915, 0, BXT_REVID_A1))
		wa_ctx_emit(batch, index, MI_ARB_ON_OFF | MI_ARB_ENABLE);

	wa_ctx_emit(batch, index, MI_BATCH_BUFFER_END);

	return wa_ctx_end(wa_ctx, *offset = index, 1);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Arun Siluvery
120
45.98%
3
27.27%
Tim Gore
118
45.21%
2
18.18%
Jani Nikula
12
4.60%
3
27.27%
Chris Wilson
9
3.45%
1
9.09%
Tvrtko A. Ursulin
1
0.38%
1
9.09%
Ville Syrjälä
1
0.38%
1
9.09%
Total
261
100.00%
11
100.00%



static int lrc_setup_wa_ctx_obj(struct intel_engine_cs *engine, u32 size)
{
	struct drm_i915_gem_object *obj;
	struct i915_vma *vma;
	int err;

	obj = i915_gem_object_create(engine->i915, PAGE_ALIGN(size));
	if (IS_ERR(obj))
		return PTR_ERR(obj);

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

	err = i915_vma_pin(vma, 0, PAGE_SIZE, PIN_GLOBAL | PIN_HIGH);
	if (err)
		goto err;

	engine->wa_ctx.vma = vma;
	return 0;

err:
	i915_gem_object_put(obj);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
80
59.70%
6
66.67%
Arun Siluvery
50
37.31%
1
11.11%
Tvrtko A. Ursulin
3
2.24%
1
11.11%
Dave Gordon
1
0.75%
1
11.11%
Total
134
100.00%
9
100.00%



static void lrc_destroy_wa_ctx_obj(struct intel_engine_cs *engine)
{
	i915_vma_unpin_and_release(&engine->wa_ctx.vma);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Arun Siluvery
16
76.19%
1
25.00%
Chris Wilson
3
14.29%
2
50.00%
Tvrtko A. Ursulin
2
9.52%
1
25.00%
Total
21
100.00%
4
100.00%



static int intel_init_workaround_bb(struct intel_engine_cs *engine)
{
	struct i915_ctx_workarounds *wa_ctx = &engine->wa_ctx;
	uint32_t *batch;
	uint32_t offset;
	struct page *page;
	int ret;

	WARN_ON(engine->id != RCS);

	/* update this when WA for higher Gen are added */
	if (INTEL_GEN(engine->i915) > 9) {
		DRM_ERROR("WA batch buffer is not initialized for Gen%d\n",
			  INTEL_GEN(engine->i915));
		return 0;
	}

	/* some WA perform writes to scratch page, ensure it is valid */
	if (!engine->scratch) {
		DRM_ERROR("scratch page not allocated for %s\n", engine->name);
		return -EINVAL;
	}

	ret = lrc_setup_wa_ctx_obj(engine, PAGE_SIZE);
	if (ret) {
		DRM_DEBUG_DRIVER("Failed to setup context WA page: %d\n", ret);
		return ret;
	}

	page = i915_gem_object_get_dirty_page(wa_ctx->vma->obj, 0);
	batch = kmap_atomic(page);
	offset = 0;

	if (IS_GEN8(engine->i915)) {
		ret = gen8_init_indirectctx_bb(engine,
					       &wa_ctx->indirect_ctx,
					       batch,
					       &offset);
		if (ret)
			goto out;

		ret = gen8_init_perctx_bb(engine,
					  &wa_ctx->per_ctx,
					  batch,
					  &offset);
		if (ret)
			goto out;
	} else if (IS_GEN9(engine->i915)) {
		ret = gen9_init_indirectctx_bb(engine,
					       &wa_ctx->indirect_ctx,
					       batch,
					       &offset);
		if (ret)
			goto out;

		ret = gen9_init_perctx_bb(engine,
					  &wa_ctx->per_ctx,
					  batch,
					  &offset);
		if (ret)
			goto out;
	}

out:
	kunmap_atomic(batch);
	if (ret)
		lrc_destroy_wa_ctx_obj(engine);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Arun Siluvery
247
86.97%
4
44.44%
Chris Wilson
22
7.75%
3
33.33%
Tvrtko A. Ursulin
14
4.93%
1
11.11%
Dave Gordon
1
0.35%
1
11.11%
Total
284
100.00%
9
100.00%



static int gen8_init_common_ring(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	int ret;

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

	intel_engine_reset_breadcrumbs(engine);
	intel_engine_init_hangcheck(engine);

	I915_WRITE(RING_HWSTAM(engine->mmio_base), 0xffffffff);
	I915_WRITE(RING_MODE_GEN7(engine),
		   _MASKED_BIT_DISABLE(GFX_REPLAY_MODE) |
		   _MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE));
	I915_WRITE(RING_HWS_PGA(engine->mmio_base),
		   engine->status_page.ggtt_offset);
	POSTING_READ(RING_HWS_PGA(engine->mmio_base));

	DRM_DEBUG_DRIVER("Execlists enabled for %s\n", engine->name);

	/* After a GPU reset, we may have requests to replay */
	if (!execlists_elsp_idle(engine)) {
		engine->execlist_port[0].count = 0;
		engine->execlist_port[1].count = 0;
		execlists_submit_ports(engine);
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
82
53.59%
4
50.00%
Arun Siluvery
57
37.25%
1
12.50%
Tvrtko A. Ursulin
8
5.23%
1
12.50%
Peter Antoine
3
1.96%
1
12.50%
Nick Hoath
3
1.96%
1
12.50%
Total
153
100.00%
8
100.00%



static int gen8_init_render_ring(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	int ret;

	ret = gen8_init_common_ring(engine);
	if (ret)
		return ret;

	/* We need to disable the AsyncFlip performance optimisations in order
         * to use MI_WAIT_FOR_EVENT within the CS. It should already be
         * programmed to '1' on all products.
         *
         * WaDisableAsyncFlipPerfMode:snb,ivb,hsw,vlv,bdw,chv
         */
	I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE));

	I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_FORCE_ORDERING));

	return init_workarounds_ring(engine);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Arun Siluvery
59
92.19%
1
33.33%
Tvrtko A. Ursulin
3
4.69%
1
33.33%
Chris Wilson
2
3.12%
1
33.33%
Total
64
100.00%
3
100.00%



static int gen9_init_render_ring(struct intel_engine_cs *engine)
{
	int ret;

	ret = gen8_init_common_ring(engine);
	if (ret)
		return ret;

	return init_workarounds_ring(engine);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Arun Siluvery
27
79.41%
1
33.33%
Damien Lespiau
4
11.76%
1
33.33%
Tvrtko A. Ursulin
3
8.82%
1
33.33%
Total
34
100.00%
3
100.00%



static void reset_common_ring(struct intel_engine_cs *engine,
			      struct drm_i915_gem_request *request)
{
	struct drm_i915_private *dev_priv = engine->i915;
	struct execlist_port *port = engine->execlist_port;
	struct intel_context *ce;

	/* If the request was innocent, we leave the request in the ELSP
         * and will try to replay it on restarting. The context image may
         * have been corrupted by the reset, in which case we may have
         * to service a new GPU hang, but more likely we can continue on
         * without impact.
         *
         * If the request was guilty, we presume the context is corrupt
         * and have to at least restore the RING register in the context
         * image back to the expected values to skip over the guilty request.
         */
	if (!request || request->fence.error != -EIO)
		return;

	/* We want a simple context + ring to execute the breadcrumb update.
         * We cannot rely on the context being intact across the GPU hang,
         * so clear it and rebuild just what we need for the breadcrumb.
         * All pending requests for this context will be zapped, and any
         * future request will be after userspace has had the opportunity
         * to recreate its own state.
         */
	ce = &request->ctx->engine[engine->id];
	execlists_init_reg_state(ce->lrc_reg_state,
				 request->ctx, engine, ce->ring);

	/* Move the RING_HEAD onto the breadcrumb, past the hanging batch */
	ce->lrc_reg_state[CTX_RING_BUFFER_START+1] =
		i915_ggtt_offset(ce->ring->vma);
	ce->lrc_reg_state[CTX_RING_HEAD+1] = request->postfix;

	request->ring->head = request->postfix;
	request->ring->last_retired_head = -1;
	intel_ring_update_space(request->ring);

	if (i915.enable_guc_submission)
		return;

	/* Catch up with any missed context-switch interrupts */
	I915_WRITE(RING_CONTEXT_STATUS_PTR(engine), _MASKED_FIELD(0xffff, 0));
	if (request->ctx != port[0].request->ctx) {
		i915_gem_request_put(port[0].request);
		port[0] = port[1];
		memset(&port[1], 0, sizeof(port[1]));
	}

	GEM_BUG_ON(request->ctx != port[0].request->ctx);

	/* Reset WaIdleLiteRestore:bdw,skl as well */
	request->tail =
		intel_ring_wrap(request->ring,
				request->wa_tail - WA_TAIL_DWORDS*sizeof(u32));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
263
100.00%
4
100.00%
Total
263
100.00%
4
100.00%



static int intel_logical_ring_emit_pdps(struct drm_i915_gem_request *req)
{
	struct i915_hw_ppgtt *ppgtt = req->ctx->ppgtt;
	struct intel_ring *ring = req->ring;
	struct intel_engine_cs *engine = req->engine;
	const int num_lri_cmds = GEN8_LEGACY_PDPES * 2;
	int i, ret;

	ret = intel_ring_begin(req, num_lri_cmds * 2 + 2);
	if (ret)
		return ret;

	intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(num_lri_cmds));
	for (i = GEN8_LEGACY_PDPES - 1; i >= 0; i--) {
		const dma_addr_t pd_daddr = i915_page_dir_dma_addr(ppgtt, i);

		intel_ring_emit_reg(ring, GEN8_RING_PDP_UDW(engine, i));
		intel_ring_emit(ring, upper_32_bits(pd_daddr));
		intel_ring_emit_reg(ring, GEN8_RING_PDP_LDW(engine, i));
		intel_ring_emit(ring, lower_32_bits(pd_daddr));
	}

	intel_ring_emit(ring, MI_NOOP);
	intel_ring_advance(ring);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Michel Thierry
147
86.47%
1
16.67%
Chris Wilson
21
12.35%
4
66.67%
Tvrtko A. Ursulin
2
1.18%
1
16.67%
Total
170
100.00%
6
100.00%



static int gen8_emit_bb_start(struct drm_i915_gem_request *req,
			      u64 offset, u32 len,
			      unsigned int dispatch_flags)
{
	struct intel_ring *ring = req->ring;
	bool ppgtt = !(dispatch_flags & I915_DISPATCH_SECURE);
	int ret;

	/* Don't rely in hw updating PDPs, specially in lite-restore.
         * Ideally, we should set Force PD Restore in ctx descriptor,
         * but we can't. Force Restore would be a second option, but
         * it is unsafe in case of lite-restore (because the ctx is
         * not idle). PML4 is allocated during ppgtt init so this is
         * not needed in 48-bit.*/
	if (req->ctx->ppgtt &&
	    (intel_engine_flag(req->engine) & req->ctx->ppgtt->pd_dirty_rings)) {
		if (!USES_FULL_48BIT_PPGTT(req->i915) &&
		    !intel_vgpu_active(req->i915)) {
			ret = intel_logical_ring_emit_pdps(req);
			if (ret)
				return ret;
		}

		req->ctx->ppgtt->pd_dirty_rings &= ~intel_engine_flag(req->engine);
	}

	ret = intel_ring_begin(req, 4);
	if (ret)
		return ret;

	/* FIXME(BDW): Address space and security selectors. */
	intel_ring_emit(ring, MI_BATCH_BUFFER_START_GEN8 |
			(ppgtt<<8) |
			(dispatch_flags & I915_DISPATCH_RS ?
			 MI_BATCH_RESOURCE_STREAMER : 0));
	intel_ring_emit(ring, lower_32_bits(offset));
	intel_ring_emit(ring, upper_32_bits(offset));
	intel_ring_emit(ring, MI_NOOP);
	intel_ring_advance(ring);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oscar Mateo
76
38.78%
1
6.67%
Michel Thierry
66
33.67%
2
13.33%
Chris Wilson
18
9.18%
5
33.33%
John Harrison
11
5.61%
2
13.33%
Abdiel Janulgue
10
5.10%
1
6.67%
Zhiyuan Lv
8
4.08%
1
6.67%
Tvrtko A. Ursulin
4
2.04%
2
13.33%
Nick Hoath
3
1.53%
1
6.67%
Total
196
100.00%
15
100.00%



static void gen8_logical_ring_enable_irq(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	I915_WRITE_IMR(engine,
		       ~(engine->irq_enable_mask | engine->irq_keep_mask));
	POSTING_READ_FW(RING_IMR(engine->mmio_base));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oscar Mateo
36
78.26%
1
25.00%
Tvrtko A. Ursulin
5
10.87%
1
25.00%
Chris Wilson
5
10.87%
2
50.00%
Total
46
100.00%
4
100.00%



static void gen8_logical_ring_disable_irq(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	I915_WRITE_IMR(engine, ~engine->irq_keep_mask);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oscar Mateo
24
80.00%
1
25.00%
Chris Wilson
3
10.00%
2
50.00%
Tvrtko A. Ursulin
3
10.00%
1
25.00%
Total
30
100.00%
4
100.00%



static int gen8_emit_flush(struct drm_i915_gem_request *request, u32 mode)
{
	struct intel_ring *ring = request->ring;
	u32 cmd;
	int ret;

	ret = intel_ring_begin(request, 4);
	if (ret)
		return ret;

	cmd = MI_FLUSH_DW + 1;

	/* We always require a command barrier so that subsequent
         * commands, such as breadcrumb interrupts, are strictly ordered
         * wrt the contents of the write cache being flushed to memory
         * (and thus being coherent from the CPU).
         */
	cmd |= MI_FLUSH_DW_STORE_INDEX | MI_FLUSH_DW_OP_STOREDW;

	if (mode & EMIT_INVALIDATE) {
		cmd |= MI_INVALIDATE_TLB;
		if (request->engine->id == VCS)
			cmd |= MI_INVALIDATE_BSD;
	}

	intel_ring_emit(ring, cmd);
	intel_ring_emit(ring,
			I915_GEM_HWS_SCRATCH_ADDR |
			MI_FLUSH_DW_USE_GTT);
	intel_ring_emit(ring, 0); /* upper addr */
	intel_ring_emit(ring, 0); /* value */
	intel_ring_advance(ring);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oscar Mateo
80
64.52%
1
10.00%
Chris Wilson
33
26.61%
6
60.00%
John Harrison
7
5.65%
1
10.00%
Nick Hoath
3
2.42%
1
10.00%
Tvrtko A. Ursulin
1
0.81%
1
10.00%
Total
124
100.00%
10
100.00%



static int gen8_emit_flush_render(struct drm_i915_gem_request *request,
				  u32 mode)
{
	struct intel_ring *ring = request->ring;
	struct intel_engine_cs *engine = request->engine;
	u32 scratch_addr =
		i915_ggtt_offset(engine->scratch) + 2 * CACHELINE_BYTES;
	bool vf_flush_wa = false, dc_flush_wa = false;
	u32 flags = 0;
	int ret;
	int len;

	flags |= PIPE_CONTROL_CS_STALL;

	if (mode & EMIT_FLUSH) {
		flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
		flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
		flags |= PIPE_CONTROL_DC_FLUSH_ENABLE;
		flags |= PIPE_CONTROL_FLUSH_ENABLE;
	}

	if (mode & EMIT_INVALIDATE) {
		flags |= PIPE_CONTROL_TLB_INVALIDATE;
		flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
		flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
		flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
		flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
		flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
		flags |= PIPE_CONTROL_QW_WRITE;
		flags |= PIPE_CONTROL_GLOBAL_GTT_IVB;

		/*
                 * On GEN9: before VF_CACHE_INVALIDATE we need to emit a NULL
                 * pipe control.
                 */
		if (IS_GEN9(request->i915))
			vf_flush_wa = true;

		/* WaForGAMHang:kbl */
		if (IS_KBL_REVID(request->i915, 0, KBL_REVID_B0))
			dc_flush_wa = true;
	}

	len = 6;

	if (vf_flush_wa)
		len += 6;

	if (dc_flush_wa)
		len += 12;

	ret = intel_ring_begin(request, len);
	if (ret)
		return ret;

	if (vf_flush_wa) {
		intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(6));
		intel_ring_emit(ring, 0);
		intel_ring_emit(ring, 0);
		intel_ring_emit(ring, 0);
		intel_ring_emit(ring, 0);
		intel_ring_emit(ring, 0);
	}

	if (dc_flush_wa) {
		intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(6));
		intel_ring_emit(ring, PIPE_CONTROL_DC_FLUSH_ENABLE);
		intel_ring_emit(ring, 0);
		intel_ring_emit(ring, 0);
		intel_ring_emit(ring, 0);
		intel_ring_emit(ring, 0);
	}

	intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(6));
	intel_ring_emit(ring, flags);
	intel_ring_emit(ring, scratch_addr);
	intel_ring_emit(ring, 0);
	intel_ring_emit(ring, 0);
	intel_ring_emit(ring, 0);

	if (dc_flush_wa) {
		intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(6));
		intel_ring_emit(ring, PIPE_CONTROL_CS_STALL);
		intel_ring_emit(ring, 0);
		intel_ring_emit(ring, 0);
		intel_ring_emit(ring, 0);
		intel_ring_emit(ring, 0);
	}

	intel_ring_advance(ring);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oscar Mateo
137
33.58%
1
5.88%
Mika Kuoppala
124
30.39%
1
5.88%
Chris Wilson
71
17.40%
8
47.06%
Imre Deak
46
11.27%
1
5.88%
Ben Widawsky
11
2.70%
1
5.88%
John Harrison
9
2.21%
1
5.88%
Francisco Jerez
4
0.98%
1
5.88%
Tvrtko A. Ursulin
3
0.74%
2
11.76%
Nick Hoath
3
0.74%
1
5.88%
Total
408
100.00%
17
100.00%



static void bxt_a_seqno_barrier(struct intel_engine_cs *engine)
{
	/*
         * On BXT A steppings there is a HW coherency issue whereby the
         * MI_STORE_DATA_IMM storing the completed request's seqno
         * occasionally doesn't invalidate the CPU cache. Work around this by
         * clflushing the corresponding cacheline whenever the caller wants
         * the coherency to be guaranteed. Note that this cacheline is known
         * to be clean at this point, since we only write it in
         * bxt_a_set_seqno(), where we also do a clflush after the write. So
         * this clflush in practice becomes an invalidate operation.
         */
	intel_flush_status_page(engine, I915_GEM_HWS_INDEX);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Imre Deak
15
78.95%
1
33.33%
Tvrtko A. Ursulin
2
10.53%
1
33.33%
Chris Wilson
2
10.53%
1
33.33%
Total
19
100.00%
3
100.00%

/*
 * Reserve space for 2 NOOPs at the end of each request to be
 * used as a workaround for not being allowed to do lite
 * restore with HEAD==TAIL (WaIdleLiteRestore).
 */


static void gen8_emit_wa_tail(struct drm_i915_gem_request *request, u32 *out)
{
	*out++ = MI_NOOP;
	*out++ = MI_NOOP;
	request->wa_tail = intel_ring_offset(request->ring, out);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
24
60.00%
1
20.00%
Oscar Mateo
9
22.50%
1
20.00%
Nick Hoath
5
12.50%
2
40.00%
John Harrison
2
5.00%
1
20.00%
Total
40
100.00%
5
100.00%



static void gen8_emit_breadcrumb(struct drm_i915_gem_request *request,
				 u32 *out)
{
	/* w/a: bit 5 needs to be zero for MI_FLUSH_DW address. */
	BUILD_BUG_ON(I915_GEM_HWS_INDEX_ADDR & (1 << 5));

	*out++ = (MI_FLUSH_DW + 1) | MI_FLUSH_DW_OP_STOREDW;
	*out++ = intel_hws_seqno_address(request->engine) | MI_FLUSH_DW_USE_GTT;
	*out++ = 0;
	*out++ = request->global_seqno;
	*out++ = MI_USER_INTERRUPT;
	*out++ = MI_NOOP;
	request->tail = intel_ring_offset(request->ring, out);

	gen8_emit_wa_tail(request, out);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
80
81.63%
6
60.00%
Oscar Mateo
15
15.31%
1
10.00%
John Harrison
1
1.02%
1
10.00%
Nick Hoath
1
1.02%
1
10.00%
Tvrtko A. Ursulin
1
1.02%
1
10.00%
Total
98
100.00%
10
100.00%


static const int gen8_emit_breadcrumb_sz = 6 + WA_TAIL_DWORDS;



static void gen8_emit_breadcrumb_render(struct drm_i915_gem_request *request,
					u32 *out)
{
	/* We're using qword write, seqno should be aligned to 8 bytes. */
	BUILD_BUG_ON(I915_GEM_HWS_INDEX & 1);

	/* w/a for post sync ops following a GPGPU operation we
         * need a prior CS_STALL, which is emitted by the flush
         * following the batch.
         */
	*out++ = GFX_OP_PIPE_CONTROL(6);
	*out++ = (PIPE_CONTROL_GLOBAL_GTT_IVB |
		  PIPE_CONTROL_CS_STALL |
		  PIPE_CONTROL_QW_WRITE);
	*out++ = intel_hws_seqno_address(request->engine);
	*out++ = 0;
	*out++ = request->global_seqno;
	/* We're thrashing one dword of HWS. */
	*out++ = 0;
	*out++ = MI_USER_INTERRUPT;
	*out++ = MI_NOOP;
	request->tail = intel_ring_offset(request->ring, out);

	gen8_emit_wa_tail(request, out);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
87
79.82%
6
60.00%
Michał Winiarski
16
14.68%
1
10.00%
Michel Thierry
3
2.75%
1
10.00%
Oscar Mateo
2
1.83%
1
10.00%
Tvrtko A. Ursulin
1
0.92%
1
10.00%
Total
109
100.00%
10
100.00%


static const int gen8_emit_breadcrumb_render_sz = 8 + WA_TAIL_DWORDS;



static int gen8_init_rcs_context(struct drm_i915_gem_request *req)
{
	int ret;

	ret = intel_logical_ring_workarounds_emit(req);
	if (ret)
		return ret;

	ret = intel_rcs_context_init_mocs(req);
	/*
         * Failing to program the MOCS is non-fatal.The system will not
         * run at peak performance. So generate an error and carry on.
         */
	if (ret)
		DRM_ERROR("MOCS failed to program: expect performance issues.\n");

	return i915_gem_render_state_emit(req);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Daniel
29
56.86%
1
25.00%
Peter Antoine
17
33.33%
1
25.00%
John Harrison
4
7.84%
1
25.00%
Chris Wilson
1
1.96%
1
25.00%
Total
51
100.00%
4
100.00%

/**
 * intel_logical_ring_cleanup() - deallocate the Engine Command Streamer
 * @engine: Engine Command Streamer.
 */


void intel_logical_ring_cleanup(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv;

	/*
         * Tasklet cannot be active at this point due intel_mark_active/idle
         * so this is just for documentation.
         */
	if (WARN_ON(test_bit(TASKLET_STATE_SCHED, &engine->irq_tasklet.state)))
		tasklet_kill(&engine->irq_tasklet);

	dev_priv = engine->i915;

	if (engine->buffer) {
		WARN_ON((I915_READ_MODE(engine) & MODE_IDLE) == 0);
	}

	if (engine->cleanup)
		engine->cleanup(engine);

	if (engine->status_page.vma) {
		i915_gem_object_unpin_map(engine->status_page.vma->obj);
		engine->status_page.vma = NULL;
	}

	intel_engine_cleanup_common(engine);

	lrc_destroy_wa_ctx_obj(engine);
	engine->i915 = NULL;
	dev_priv->engine[engine->id] = NULL;
	kfree(engine);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oscar Mateo
58
40.56%
3
21.43%
Tvrtko A. Ursulin
39
27.27%
3
21.43%
Akash Goel
16
11.19%
1
7.14%
Chris Wilson
11
7.69%
4
28.57%
Dave Gordon
11
7.69%
1
7.14%
John Harrison
4
2.80%
1
7.14%
Arun Siluvery
4
2.80%
1
7.14%
Total
143
100.00%
14
100.00%



void intel_execlists_enable_submission(struct drm_i915_private *dev_priv)
{
	struct intel_engine_cs *engine;
	enum intel_engine_id id;

	for_each_engine(engine, dev_priv, id) {
		engine->submit_request = execlists_submit_request;
		engine->schedule = execlists_schedule;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
35
85.37%
3
75.00%
Akash Goel
6
14.63%
1
25.00%
Total
41
100.00%
4
100.00%


static void

logical_ring_default_vfuncs(struct intel_engine_cs *engine)
{
	/* Default vfuncs which can be overriden by each engine. */
	engine->init_hw = gen8_init_common_ring;
	engine->reset_hw = reset_common_ring;

	engine->context_pin = execlists_context_pin;
	engine->context_unpin = execlists_context_unpin;

	engine->request_alloc = execlists_request_alloc;

	engine->emit_flush = gen8_emit_flush;
	engine->emit_breadcrumb = gen8_emit_breadcrumb;
	engine->emit_breadcrumb_sz = gen8_emit_breadcrumb_sz;
	engine->submit_request = execlists_submit_request;
	engine->schedule = execlists_schedule;

	engine->irq_enable = gen8_logical_ring_enable_irq;
	engine->irq_disable = gen8_logical_ring_disable_irq;
	engine->emit_bb_start = gen8_emit_bb_start;
	if (IS_BXT_REVID(engine->i915, 0, BXT_REVID_A1))
		engine->irq_seqno_barrier = bxt_a_seqno_barrier;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
55
50.46%
12
85.71%
Tvrtko A. Ursulin
54
49.54%
2
14.29%
Total
109
100.00%
14
100.00%


static inline void

logical_ring_default_irqs(struct intel_engine_cs *engine)
{
	unsigned shift = engine->irq_shift;
	engine->irq_enable_mask = GT_RENDER_USER_INTERRUPT << shift;
	engine->irq_keep_mask = GT_CONTEXT_SWITCH_INTERRUPT << shift;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tvrtko A. Ursulin
27
77.14%
2
50.00%
Dave Gordon
7
20.00%
1
25.00%
Oscar Mateo
1
2.86%
1
25.00%
Total
35
100.00%
4
100.00%


static int

lrc_setup_hws(struct intel_engine_cs *engine, struct i915_vma *vma)
{
	const int hws_offset = LRC_PPHWSP_PN * PAGE_SIZE;
	void *hws;

	/* The HWSP is part of the default context object in LRC mode. */
	hws = i915_gem_object_pin_map(vma->obj, I915_MAP_WB);
	if (IS_ERR(hws))
		return PTR_ERR(hws);

	engine->status_page.page_addr = hws + hws_offset;
	engine->status_page.ggtt_offset = i915_ggtt_offset(vma) + hws_offset;
	engine->status_page.vma = vma;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tvrtko A. Ursulin
56
64.37%
3
42.86%
Chris Wilson
31
35.63%
4
57.14%
Total
87
100.00%
7
100.00%


static void

logical_ring_setup(struct intel_engine_cs *engine)
{
	struct drm_i915_private *dev_priv = engine->i915;
	enum forcewake_domains fw_domains;

	intel_engine_setup_common(engine);

	/* Intentionally left blank. */
	engine->buffer = NULL;

	fw_domains = intel_uncore_forcewake_for_reg(dev_priv,
						    RING_ELSP(engine),
						    FW_REG_WRITE);

	fw_domains |= intel_uncore_forcewake_for_reg(dev_priv,
						     RING_CONTEXT_STATUS_PTR(engine),
						     FW_REG_READ | FW_REG_WRITE);

	fw_domains |= intel_uncore_forcewake_for_reg(dev_priv,
						     RING_CONTEXT_STATUS_BUF_BASE(engine),
						     FW_REG_READ);

	engine->fw_domains = fw_domains;

	tasklet_init(&engine->irq_tasklet,
		     intel_lrc_irq_handler, (unsigned long)engine);

	logical_ring_init_platform_invariants(engine);
	logical_ring_default_vfuncs(engine);
	logical_ring_default_irqs(engine);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tvrtko A. Ursulin
116
99.15%
2
66.67%
Chris Wilson
1
0.85%
1
33.33%
Total
117
100.00%
3
100.00%


static int

logical_ring_init(struct intel_engine_cs *engine)
{
	struct i915_gem_context *dctx = engine->i915->kernel_context;
	int ret;

	ret = intel_engine_init_common(engine);
	if (ret)
		goto error;

	/* And setup the hardware status page. */
	ret = lrc_setup_hws(engine, dctx->engine[engine->id].state);
	if (ret) {
		DRM_ERROR("Failed to set up hws %s: %d\n", engine->name, ret);
		goto error;
	}

	return 0;

error:
	intel_logical_ring_cleanup(engine);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tvrtko A. Ursulin
58
63.74%
7
58.33%
Chris Wilson
21
23.08%
3
25.00%
Oscar Mateo
9
9.89%
1
8.33%
Dave Gordon
3
3.30%
1
8.33%
Total
91
100.00%
12
100.00%



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

	logical_ring_setup(engine);

	if (HAS_L3_DPF(dev_priv))
		engine->irq_keep_mask |= GT_RENDER_L3_PARITY_ERROR_INTERRUPT;

	/* Override some for render ring. */
	if (INTEL_GEN(dev_priv) >= 9)
		engine->init_hw = gen9_init_render_ring;
	else
		engine->init_hw = gen8_init_render_ring;
	engine->init_context = gen8_init_rcs_context;
	engine->emit_flush = gen8_emit_flush_render;
	engine->emit_breadcrumb = gen8_emit_breadcrumb_render;
	engine->emit_breadcrumb_sz = gen8_emit_breadcrumb_render_sz;

	ret = intel_engine_create_scratch(engine, PAGE_SIZE);
	if (ret)
		return ret;

	ret = intel_init_workaround_bb(engine);
	if (ret) {
		/*
                 * We continue even if we fail to initialize WA batch
                 * because we only expect rare glitches but nothing
                 * critical to prevent us from using GPU
                 */
		DRM_ERROR("WA batch buffer initialization failed: %d\n",
			  ret);
	}

	return logical_ring_init(engine);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tvrtko A. Ursulin
117
90.00%
3
33.33%
Chris Wilson
11
8.46%
5
55.56%
Nick Hoath
2
1.54%
1
11.11%
Total
130
100.00%
9
100.00%



int logical_xcs_ring_init(struct intel_engine_cs *engine)
{
	logical_ring_setup(engine);

	return logical_ring_init(engine);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tvrtko A. Ursulin
21
100.00%
1
100.00%
Total
21
100.00%
1
100.00%


static u32

make_rpcs(struct drm_i915_private *dev_priv)
{
	u32 rpcs = 0;

	/*
         * No explicit RPCS request is needed to ensure full
         * slice/subslice/EU enablement prior to Gen9.
        */
	if (INTEL_GEN(dev_priv) < 9)
		return 0;

	/*
         * Starting in Gen9, render power gating can leave
         * slice/subslice/EU in a partially enabled state. We
         * must make an explicit request through RPCS for full
         * enablement.
        */
	if (INTEL_INFO(dev_priv)->sseu.has_slice_pg) {
		rpcs |= GEN8_RPCS_S_CNT_ENABLE;
		rpcs |= hweight8(INTEL_INFO(dev_priv)->sseu.slice_mask) <<
			GEN8_RPCS_S_CNT_SHIFT;
		rpcs |= GEN8_RPCS_ENABLE;
	}

	if (INTEL_INFO(dev_priv)->sseu.has_subslice_pg) {
		rpcs |= GEN8_RPCS_SS_CNT_ENABLE;
		rpcs |= hweight8(INTEL_INFO(dev_priv)->sseu.subslice_mask) <<
			GEN8_RPCS_SS_CNT_SHIFT;
		rpcs |= GEN8_RPCS_ENABLE;
	}

	if (INTEL_INFO(dev_priv)->sseu.has_eu_pg) {
		rpcs |= INTEL_INFO(dev_priv)->sseu.eu_per_subslice <<
			GEN8_RPCS_EU_MIN_SHIFT;
		rpcs |= INTEL_INFO(dev_priv)->sseu.eu_per_subslice <<
			GEN8_RPCS_EU_MAX_SHIFT;
		rpcs |= GEN8_RPCS_ENABLE;
	}

	return rpcs;
}

Contributors
Person
Tokens
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Commits
CommitProp
Jeff McGee
116
77.33%
1
16.67%
Imre Deak
22
14.67%
3
50.00%
Chris Wilson
11
7.33%
1
16.67%
Oscar Mateo
1
0.67%
1
16.67%
Total
150
100.00%
6
100.00%



static u32 intel_lr_indirect_ctx_offset(struct intel_engine_cs *engine)
{
	u32 indirect_ctx_offset;

	switch (INTEL_GEN(engine->i915)) {
	default:
		MISSING_CASE(INTEL_GEN(engine->i915));
		/* fall through */
	case 9:
		indirect_ctx_offset =
			GEN9_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT;
		break;
	case 8:
		indirect_ctx_offset =
			GEN8_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT;
		break;
	}

	return indirect_ctx_offset;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Michel Thierry
49
87.50%
1
33.33%
Chris Wilson
4
7.14%
1
33.33%
Tvrtko A. Ursulin
3
5.36%
1
33.33%
Total
56
100.00%
3
100.00%



static void execlists_init_reg_state(u32 *reg_state,
				     struct i915_gem_context *ctx,
				     struct intel_engine_cs *engine,
				     struct intel_ring *ring)
{
	struct drm_i915_private *dev_priv = engine->i915;
	struct i915_hw_ppgtt *ppgtt = ctx->ppgtt ?: dev_priv->mm.aliasing_ppgtt;

	/* A context is actually a big batch buffer with several MI_LOAD_REGISTER_IMM
         * commands followed by (reg, value) pairs. The values we are setting here are
         * only for the first context restore: on a subsequent save, the GPU will
         * recreate this batchbuffer with new values (including all the missing
         * MI_LOAD_REGISTER_IMM commands that we are not initializing here). */
	reg_state[CTX_LRI_HEADER_0] =
		MI_LOAD_REGISTER_IMM(engine->id == RCS ? 14 : 11) | MI_LRI_FORCE_POSTED;
	ASSIGN_CTX_REG(reg_state, CTX_CONTEXT_CONTROL,
		       RING_CONTEXT_CONTROL(engine),
		       _MASKED_BIT_ENABLE(CTX_CTRL_INHIBIT_SYN_CTX_SWITCH |
					  CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT |
					  (HAS_RESOURCE_STREAMER(dev_priv) ?
					   CTX_CTRL_RS_CTX_ENABLE : 0)));
	ASSIGN_CTX_REG(reg_state, CTX_RING_HEAD, RING_HEAD(engine->mmio_base),
		       0);
	ASSIGN_CTX_REG(reg_state, CTX_RING_TAIL, RING_TAIL(engine->mmio_base),
		       0);
	ASSIGN_CTX_REG(reg_state, CTX_RING_BUFFER_START,
		       RING_START(engine->mmio_base), 0);
	ASSIGN_CTX_REG(reg_state, CTX_RING_BUFFER_CONTROL,
		       RING_CTL(engine->mmio_base),
		       RING_CTL_SIZE(ring->size) | RING_VALID);
	ASSIGN_CTX_REG(reg_state, CTX_BB_HEAD_U,
		       RING_BBADDR_UDW(engine->mmio_base), 0);
	ASSIGN_CTX_REG(reg_state, CTX_BB_HEAD_L,
		       RING_BBADDR(engine->mmio_base), 0);
	ASSIGN_CTX_REG(reg_state, CTX_BB_STATE,
		       RING_BBSTATE(engine->mmio_base),
		       RING_BB_PPGTT);
	ASSIGN_CTX_REG(reg_state, CTX_SECOND_BB_HEAD_U,
		       RING_SBBADDR_UDW(engine->mmio_base), 0);
	ASSIGN_CTX_REG(reg_state, CTX_SECOND_BB_HEAD_L,
		       RING_SBBADDR(engine->mmio_base), 0);
	ASSIGN_CTX_REG(reg_state, CTX_SECOND_BB_STATE,
		       RING_SBBSTATE(engine->mmio_base), 0);
	if (engine->id == RCS) {
		ASSIGN_CTX_REG(reg_state, CTX_BB_PER_CTX_PTR,
			       RING_BB_PER_CTX_PTR(engine->mmio_base), 0);
		ASSIGN_CTX_REG(reg_state, CTX_RCS_INDIRECT_CTX,
			       RING_INDIRECT_CTX(engine->mmio_base), 0);
		ASSIGN_CTX_REG(reg_state, CTX_RCS_INDIRECT_CTX_OFFSET,
			       RING_INDIRECT_CTX_OFFSET(engine->mmio_base), 0);
		if (engine->wa_ctx.vma) {
			struct i915_ctx_workarounds *wa_ctx = &engine->wa_ctx;
			u32 ggtt_offset = i915_ggtt_offset(wa_ctx->vma);

			reg_state[CTX_RCS_INDIRECT_CTX+1] =
				(ggtt_offset + wa_ctx->indirect_ctx.offset * sizeof(uint32_t)) |
				(wa_ctx->indirect_ctx.size / CACHELINE_DWORDS);

			reg_state[CTX_RCS_INDIRECT_CTX_OFFSET+1] =
				intel_lr_indirect_ctx_offset(engine) << 6;

			reg_state[CTX_BB_PER_CTX_PTR+1] =
				(ggtt_offset + wa_ctx->per_ctx.offset * sizeof(uint32_t)) |
				0x01;
		}
	}
	reg_state[CTX_LRI_HEADER_1] = MI_LOAD_REGISTER_IMM(9) | MI_LRI_FORCE_POSTED;
	ASSIGN_CTX_REG(reg_state, CTX_CTX_TIMESTAMP,
		       RING_CTX_TIMESTAMP(engine->mmio_base), 0);
	/* PDP values well be assigned later if needed */
	ASSIGN_CTX_REG(reg_state, CTX_PDP3_UDW, GEN8_RING_PDP_UDW(engine, 3),
		       0);
	ASSIGN_CTX_REG(reg_state, CTX_PDP3_LDW, GEN8_RING_PDP_LDW(engine, 3),
		       0);
	ASSIGN_CTX_REG(reg_state, CTX_PDP2_UDW, GEN8_RING_PDP_UDW(engine, 2),
		       0);
	ASSIGN_CTX_REG(reg_state, CTX_PDP2_LDW, GEN8_RING_PDP_LDW(engine, 2),
		       0);
	ASSIGN_CTX_REG(reg_state, CTX_PDP1_UDW, GEN8_RING_PDP_UDW(engine, 1),
		       0);
	ASSIGN_CTX_REG(reg_state, CTX_PDP1_LDW, GEN8_RING_PDP_LDW(engine, 1),
		       0);
	ASSIGN_CTX_REG(reg_state, CTX_PDP0_UDW, GEN8_RING_PDP_UDW(engine, 0),
		       0);
	ASSIGN_CTX_REG(reg_state, CTX_PDP0_LDW, GEN8_RING_PDP_LDW(engine, 0),
		       0);

	if (ppgtt && USES_FULL_48BIT_PPGTT(ppgtt->base.dev)) {
		/* 64b PPGTT (48bit canonical)
                 * PDP0_DESCRIPTOR contains the base address to PML4 and
                 * other PDP Descriptors are ignored.
                 */
		ASSIGN_CTX_PML4(ppgtt, reg_state);
	}

	if (engine->id == RCS) {
		reg_state[CTX_LRI_HEADER_2] = MI_LOAD_REGISTER_IMM(1);
		ASSIGN_CTX_REG(reg_state, CTX_R_PWR_CLK_STATE, GEN8_R_PWR_CLK_STATE,
			       make_rpcs(dev_priv));
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oscar Mateo
243
37.97%
2
9.09%
Ville Syrjälä
193
30.16%
2
9.09%
Arun Siluvery
88
13.75%
1
4.55%
Michel Thierry
32
5.00%
3
13.64%
Tvrtko A. Ursulin
30
4.69%
1
4.55%
Chris Wilson
26
4.06%
6
27.27%
Thomas Daniel
12
1.88%
1
4.55%
Jeff McGee
5
0.78%
1
4.55%
Daniel Vetter
5
0.78%
2
9.09%
Zhenyu Wang
2
0.31%
1
4.55%
Zhi Wang
2
0.31%
1
4.55%
Abdiel Janulgue
2
0.31%
1
4.55%
Total
640
100.00%
22
100.00%


static int

populate_lr_context(struct i915_gem_context *ctx,
		    struct drm_i915_gem_object *ctx_obj,
		    struct intel_engine_cs *engine,
		    struct intel_ring *ring)
{
	void *vaddr;
	int ret;

	ret = i915_gem_object_set_to_cpu_domain(ctx_obj, true);
	if (ret) {
		DRM_DEBUG_DRIVER("Could not set to CPU domain\n");
		return ret;
	}

	vaddr = i915_gem_object_pin_map(ctx_obj, I915_MAP_WB);
	if (IS_ERR(vaddr)) {
		ret = PTR_ERR(vaddr);
		DRM_DEBUG_DRIVER("Could not map object pages! (%d)\n", ret);
		return ret;
	}
	ctx_obj->mm.dirty = true;

	/* The second page of the context object contains some fields which must
         * be set up prior to the first execution. */

	execlists_init_reg_state(vaddr + LRC_STATE_PN * PAGE_SIZE,
				 ctx, engine, ring);

	i915_gem_object_unpin_map(ctx_obj);

	return 0;
}

Contributors
Person
Tokens
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Commits
CommitProp
Chris Wilson
114
92.68%
2
40.00%
Oscar Mateo
8
6.50%
2
40.00%
Tvrtko A. Ursulin
1
0.81%
1
20.00%
Total
123
100.00%
5
100.00%

/**
 * intel_lr_context_size() - return the size of the context for an engine
 * @engine: which engine to find the context size for
 *
 * Each engine may require a different amount of space for a context image,
 * so when allocating (or copying) an image, this function can be used to
 * find the right size for the specific engine.
 *
 * Return: size (in bytes) of an engine-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.
 */


uint32_t intel_lr_context_size(struct intel_engine_cs *engine)
{
	int ret = 0;

	WARN_ON(INTEL_GEN(engine->i915) < 8);

	switch (engine->id) {
	case RCS:
		if (INTEL_GEN(engine->i915) >= 9)
			ret = GEN9_LR_CONTEXT_RENDER_SIZE;
		else
			ret = GEN8_LR_CONTEXT_RENDER_SIZE;
		break;
	case VCS:
	case BCS:
	case VECS:
	case VCS2:
		ret = GEN8_LR_CONTEXT_OTHER_SIZE;
		break;
	}

	return ret;
}

Contributors
Person
Tokens
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Commits
CommitProp
Oscar Mateo
56
70.89%
2
33.33%
Michael H. Nguyen
14
17.72%
1
16.67%
Tvrtko A. Ursulin
4
5.06%
1
16.67%
Chris Wilson
4
5.06%
1
16.67%
Dave Gordon
1
1.27%
1
16.67%
Total
79
100.00%
6
100.00%



static int execlists_context_deferred_alloc(struct i915_gem_context *ctx,
					    struct intel_engine_cs *engine)
{
	struct drm_i915_gem_object *ctx_obj;
	struct intel_context *ce = &ctx->engine[engine->id];
	struct i915_vma *vma;
	uint32_t context_size;
	struct intel_ring *ring;
	int ret;

	WARN_ON(ce->state);

	context_size = round_up(intel_lr_context_size(engine),
				I915_GTT_PAGE_SIZE);

	/* One extra page as the sharing data between driver and GuC */
	context_size += PAGE_SIZE * LRC_PPHWSP_PN;

	ctx_obj = i915_gem_object_create(ctx->i915, context_size);
	if (IS_ERR(ctx_obj)) {
		DRM_DEBUG_DRIVER("Alloc LRC backing obj failed.\n");
		return PTR_ERR(ctx_obj);
	}

	vma = i915_vma_instance(ctx_obj, &ctx->i915->ggtt.base, NULL);
	if (IS_ERR(vma)) {
		ret = PTR_ERR(vma);
		goto error_deref_obj;
	}

	ring = intel_engine_create_ring(engine, ctx->ring_size);
	if (IS_ERR(ring)) {
		ret = PTR_ERR(ring);
		goto error_deref_obj;
	}

	ret = populate_lr_context(ctx, ctx_obj, engine, ring);
	if (ret) {
		DRM_DEBUG_DRIVER("Failed to populate LRC: %d\n", ret);
		goto error_ring_free;
	}

	ce->ring = ring;
	ce->state = vma;
	ce->initialised = engine->init_context == NULL;

	return 0;

error_ring_free:
	intel_ring_free(ring);
error_deref_obj:
	i915_gem_object_put(ctx_obj);
	return ret;
}

Contributors
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Oscar Mateo
113
45.75%
6
20.00%
Chris Wilson
99
40.08%
13
43.33%
Thomas Daniel
8
3.24%
1
3.33%
Alex Dai
7
2.83%
1
3.33%
Tvrtko A. Ursulin
5
2.02%
1
3.33%
Dave Gordon
4
1.62%
3
10.00%
Zhi Wang
3
1.21%
1
3.33%
Michel Thierry
3
1.21%
1
3.33%
Nick Hoath
2
0.81%
1
3.33%
Daniel Vetter
2
0.81%
1
3.33%
Dan Carpenter
1
0.40%
1
3.33%
Total
247
100.00%
30
100.00%



void intel_lr_context_resume(struct drm_i915_private *dev_priv)
{
	struct intel_engine_cs *engine;
	struct i915_gem_context *ctx;
	enum intel_engine_id id;

	/* Because we emit WA_TAIL_DWORDS there may be a disparity
         * between our bookkeeping in ce->ring->head and ce->ring->tail and
         * that stored in context. As we only write new commands from
         * ce->ring->tail onwards, everything before that is junk. If the GPU
         * starts reading from its RING_HEAD from the context, it may try to
         * execute that junk and die.
         *
         * So to avoid that we reset the context images upon resume. For
         * simplicity, we just zero everything out.
         */
	list_for_each_entry(ctx, &dev_priv->context_list, link) {
		for_each_engine(engine, dev_priv, id) {
			struct intel_context *ce = &ctx->engine[engine->id];
			u32 *reg;

			if (!ce->state)
				continue;

			reg = i915_gem_object_pin_map(ce->state->obj,
						      I915_MAP_WB);
			if (WARN_ON(IS_ERR(reg)))
				continue;

			reg += LRC_STATE_PN * PAGE_SIZE / sizeof(*reg);
			reg[CTX_RING_HEAD+1] = 0;
			reg[CTX_RING_TAIL+1] = 0;

			ce->state->obj->mm.dirty = true;
			i915_gem_object_unpin_map(ce->state->obj);

			ce->ring->head = ce->ring->tail = 0;
			ce->ring->last_retired_head = -1;
			intel_ring_update_space(ce->ring);
		}
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
85
48.02%
7
53.85%
Thomas Daniel
67
37.85%
1
7.69%
Tvrtko A. Ursulin
18
10.17%
3
23.08%
Akash Goel
6
3.39%
1
7.69%
Alex Dai
1
0.56%
1
7.69%
Total
177
100.00%
13
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Chris Wilson
3226
36.56%
77
32.49%
Arun Siluvery
1262
14.30%
12
5.06%
Oscar Mateo
1151
13.04%
20
8.44%
Tvrtko A. Ursulin
870
9.86%
25
10.55%
Michel Thierry
515
5.84%
10
4.22%
Mika Kuoppala
300
3.40%
8
3.38%
Thomas Daniel
262
2.97%
7
2.95%
Ville Syrjälä
224
2.54%
5
2.11%
Tim Gore
192
2.18%
3
1.27%
Ben Widawsky
140
1.59%
4
1.69%
Imre Deak
135
1.53%
6
2.53%
Jeff McGee
121
1.37%
1
0.42%
John Harrison
78
0.88%
9
3.80%
Nick Hoath
41
0.46%
6
2.53%
Dave Gordon
30
0.34%
7
2.95%
Zhi Wang
29
0.33%
6
2.53%
Akash Goel
28
0.32%
1
0.42%
Damien Lespiau
27
0.31%
2
0.84%
Peter Antoine
24
0.27%
3
1.27%
Jani Nikula
23
0.26%
3
1.27%
Zhiyuan Lv
22
0.25%
2
0.84%
Daniel Vetter
21
0.24%
7
2.95%
Michael H. Nguyen
18
0.20%
1
0.42%
Daniele Ceraolo Spurio
17
0.19%
2
0.84%
Michał Winiarski
16
0.18%
1
0.42%
Alex Dai
12
0.14%
1
0.42%
Abdiel Janulgue
12
0.14%
1
0.42%
Andrzej Hajda
10
0.11%
1
0.42%
Min He
7
0.08%
1
0.42%
Francisco Jerez
4
0.05%
1
0.42%
Dave Airlie
3
0.03%
1
0.42%
Changbin Du
2
0.02%
1
0.42%
Zhenyu Wang
2
0.02%
1
0.42%
Dan Carpenter
1
0.01%
1
0.42%
Total
8825
100.00%
237
100.00%
Directory: drivers/gpu/drm/i915

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