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OpenCloudOS-Kernel/drivers/gpu/drm/i915/intel_lrc.c

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/*
* 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 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)
#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;
}
/**
* 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 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;
}
uint64_t intel_lr_context_descriptor(struct i915_gem_context *ctx,
struct intel_engine_cs *engine)
{
return ctx->engine[engine->id].lrc_desc;
}
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->ctx->status_notifier, status, rq);
}
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);
}
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;
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;
}
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];
GEM_BUG_ON(port[0].count > 1);
if (!port[0].count)
execlists_context_status_change(port[0].request,
INTEL_CONTEXT_SCHEDULE_IN);
desc[0] = execlists_update_context(port[0].request);
port[0].count++;
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);
}
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));
}
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;
}
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);
}
static bool execlists_elsp_idle(struct intel_engine_cs *engine)
{
return !engine->execlist_port[0].request;
}
/**
* 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) {
/* Interrupt/tasklet pending? */
if (test_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted))
return false;
/* Both ports drained, no more ELSP submission? */
if (!execlists_elsp_idle(engine))
return false;
}
return true;
}
static bool execlists_elsp_ready(const struct intel_engine_cs *engine)
{
const struct execlist_port *port = engine->execlist_port;
return port[0].count + port[1].count < 2;
}
/*
* 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);
while (test_and_clear_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted)) {
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 (head == tail)
break;
if (tail < head)
tail += GEN8_CSB_ENTRIES;
do {
unsigned int idx = ++head % GEN8_CSB_ENTRIES;
unsigned int status = readl(buf + 2 * idx);
if (!(status & GEN8_CTX_STATUS_COMPLETED_MASK))
continue;
/* Check the context/desc id for this event matches */
GEM_BUG_ON(readl(buf + 2 * idx + 1) !=
upper_32_bits(intel_lr_context_descriptor(port[0].request->ctx,
engine)));
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]));
}
GEM_BUG_ON(port[0].count == 0 &&
!(status & GEN8_CTX_STATUS_ACTIVE_IDLE));
} while (head < tail);
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);
}
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;
}
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_ready(engine))
tasklet_hi_schedule(&engine->irq_tasklet);
}
spin_unlock_irqrestore(&engine->timeline->lock, flags);
}
static struct intel_engine_cs *
pt_lock_engine(struct i915_priotree *pt, struct intel_engine_cs *locked)
{
struct intel_engine_cs *engine;
engine = container_of(pt,
struct drm_i915_gem_request,
priotree)->engine;
if (engine != locked) {
if (locked)
spin_unlock_irq(&locked->timeline->lock);
spin_lock_irq(&engine->timeline->lock);
}
return engine;
}
static void execlists_schedule(struct drm_i915_gem_request *request, int prio)
{
struct intel_engine_cs *engine = NULL;
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;
list_for_each_entry(p, &pt->signalers_list, signal_link)
if (prio > READ_ONCE(p->signaler->priority))
list_move_tail(&p->dfs_link, &dfs);
list_safe_reset_next(dep, p, dfs_link);
if (!RB_EMPTY_NODE(&pt->node))
continue;
engine = pt_lock_engine(pt, engine);
/* If it is not already in the rbtree, we can update the
* priority inplace and skip over it (and its dependencies)
* if it is referenced *again* as we descend the dfs.
*/
if (prio > pt->priority && RB_EMPTY_NODE(&pt->node)) {
pt->priority = prio;
list_del_init(&dep->dfs_link);
}
}
/* 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;
GEM_BUG_ON(RB_EMPTY_NODE(&pt->node));
pt->priority = prio;
rb_erase(&pt->node, &engine->execlist_queue);
if (insert_request(pt, &engine->execlist_queue))
engine->execlist_first = &pt->node;
}
if (engine)
spin_unlock_irq(&engine->timeline->lock);
/* XXX Do we need to preempt to make room for us and our deps? */
}
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;
}
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);
}
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;
}
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;
}
#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;
}
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);
}
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;
}
/*
* 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);
}
/*
* 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);
}
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);
/* WaFlushCoherentL3CacheLinesAtContextSwitch:skl,bxt,glk */
ret = gen8_emit_flush_coherentl3_wa(engine, batch, index);
if (ret < 0)
return ret;
index = ret;
/* WaDisableGatherAtSetShaderCommonSlice:skl,bxt,kbl,glk */
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,glk */
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);
}
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);
wa_ctx_emit(batch, index, MI_BATCH_BUFFER_END);
return wa_ctx_end(wa_ctx, *offset = index, 1);
}
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;
}
static void lrc_destroy_wa_ctx_obj(struct intel_engine_cs *engine)
{
i915_vma_unpin_and_release(&engine->wa_ctx.vma);
}
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;
}
static u32 port_seqno(struct execlist_port *port)
{
return port->request ? port->request->global_seqno : 0;
}
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 */
clear_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted);
if (!execlists_elsp_idle(engine)) {
DRM_DEBUG_DRIVER("Restarting %s from requests [0x%x, 0x%x]\n",
engine->name,
port_seqno(&engine->execlist_port[0]),
port_seqno(&engine->execlist_port[1]));
engine->execlist_port[0].count = 0;
engine->execlist_port[1].count = 0;
execlists_submit_ports(engine);
}
return 0;
}
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);
}
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);
}
static void reset_common_ring(struct intel_engine_cs *engine,
struct drm_i915_gem_request *request)
{
struct execlist_port *port = engine->execlist_port;
struct intel_context *ce = &request->ctx->engine[engine->id];
/* 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.
*/
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 */
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 = request->wa_tail - WA_TAIL_DWORDS * sizeof(u32);
}
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;
}
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;
}
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));
}
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);
}
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;
}
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;
}
/*
* 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);
}
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);
}
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);
}
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);
}
/**
* 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);
}
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;
}
}
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;
}
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;
}
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;
}
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_default_vfuncs(engine);
logical_ring_default_irqs(engine);
}
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;
}
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);
}
int logical_xcs_ring_init(struct intel_engine_cs *engine)
{
logical_ring_setup(engine);
return logical_ring_init(engine);
}
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;
}
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;
}
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));
}
}
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;
}
/**
* 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;
}
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;
}
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);
}
}
}
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