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ubuntu-linux-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 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 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
#define GEN10_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT 0x19
/* Typical size of the average request (2 pipecontrols and a MI_BB) */
#define EXECLISTS_REQUEST_SIZE 64 /* bytes */
#define WA_TAIL_DWORDS 2
#define WA_TAIL_BYTES (sizeof(u32) * WA_TAIL_DWORDS)
#define PREEMPT_ID 0x1
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))
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_HEADER_PAGES * PAGE_SIZE;
/* bits 12-31 */
desc |= (u64)ctx->hw_id << GEN8_CTX_ID_SHIFT; /* bits 32-52 */
ce->lrc_desc = desc;
}
static struct i915_priolist *
lookup_priolist(struct intel_engine_cs *engine,
struct i915_priotree *pt,
int prio)
{
struct intel_engine_execlists * const execlists = &engine->execlists;
struct i915_priolist *p;
struct rb_node **parent, *rb;
bool first = true;
if (unlikely(execlists->no_priolist))
prio = I915_PRIORITY_NORMAL;
find_priolist:
/* most positive priority is scheduled first, equal priorities fifo */
rb = NULL;
parent = &execlists->queue.rb_node;
while (*parent) {
rb = *parent;
p = rb_entry(rb, typeof(*p), node);
if (prio > p->priority) {
parent = &rb->rb_left;
} else if (prio < p->priority) {
parent = &rb->rb_right;
first = false;
} else {
return p;
}
}
if (prio == I915_PRIORITY_NORMAL) {
p = &execlists->default_priolist;
} else {
p = kmem_cache_alloc(engine->i915->priorities, GFP_ATOMIC);
/* Convert an allocation failure to a priority bump */
if (unlikely(!p)) {
prio = I915_PRIORITY_NORMAL; /* recurses just once */
/* To maintain ordering with all rendering, after an
* allocation failure we have to disable all scheduling.
* Requests will then be executed in fifo, and schedule
* will ensure that dependencies are emitted in fifo.
* There will be still some reordering with existing
* requests, so if userspace lied about their
* dependencies that reordering may be visible.
*/
execlists->no_priolist = true;
goto find_priolist;
}
}
p->priority = prio;
INIT_LIST_HEAD(&p->requests);
rb_link_node(&p->node, rb, parent);
rb_insert_color(&p->node, &execlists->queue);
if (first)
execlists->first = &p->node;
return ptr_pack_bits(p, first, 1);
}
static void unwind_wa_tail(struct drm_i915_gem_request *rq)
{
rq->tail = intel_ring_wrap(rq->ring, rq->wa_tail - WA_TAIL_BYTES);
assert_ring_tail_valid(rq->ring, rq->tail);
}
static void unwind_incomplete_requests(struct intel_engine_cs *engine)
{
struct drm_i915_gem_request *rq, *rn;
struct i915_priolist *uninitialized_var(p);
int last_prio = I915_PRIORITY_INVALID;
lockdep_assert_held(&engine->timeline->lock);
list_for_each_entry_safe_reverse(rq, rn,
&engine->timeline->requests,
link) {
if (i915_gem_request_completed(rq))
return;
__i915_gem_request_unsubmit(rq);
unwind_wa_tail(rq);
GEM_BUG_ON(rq->priotree.priority == I915_PRIORITY_INVALID);
if (rq->priotree.priority != last_prio) {
p = lookup_priolist(engine,
&rq->priotree,
rq->priotree.priority);
p = ptr_mask_bits(p, 1);
last_prio = rq->priotree.priority;
}
list_add(&rq->priotree.link, &p->requests);
}
}
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);
}
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 ?: rq->i915->mm.aliasing_ppgtt;
u32 *reg_state = ce->lrc_reg_state;
reg_state[CTX_RING_TAIL+1] = intel_ring_set_tail(rq->ring, 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 && !i915_vm_is_48bit(&ppgtt->base))
execlists_update_context_pdps(ppgtt, reg_state);
return ce->lrc_desc;
}
static inline void elsp_write(u64 desc, u32 __iomem *elsp)
{
writel(upper_32_bits(desc), elsp);
writel(lower_32_bits(desc), elsp);
}
static void execlists_submit_ports(struct intel_engine_cs *engine)
{
struct execlist_port *port = engine->execlists.port;
u32 __iomem *elsp =
engine->i915->regs + i915_mmio_reg_offset(RING_ELSP(engine));
unsigned int n;
for (n = execlists_num_ports(&engine->execlists); n--; ) {
struct drm_i915_gem_request *rq;
unsigned int count;
u64 desc;
rq = port_unpack(&port[n], &count);
if (rq) {
GEM_BUG_ON(count > !n);
if (!count++)
execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_IN);
port_set(&port[n], port_pack(rq, count));
desc = execlists_update_context(rq);
GEM_DEBUG_EXEC(port[n].context_id = upper_32_bits(desc));
} else {
GEM_BUG_ON(!n);
desc = 0;
}
elsp_write(desc, 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 port_assign(struct execlist_port *port,
struct drm_i915_gem_request *rq)
{
GEM_BUG_ON(rq == port_request(port));
if (port_isset(port))
i915_gem_request_put(port_request(port));
port_set(port, port_pack(i915_gem_request_get(rq), port_count(port)));
}
static void inject_preempt_context(struct intel_engine_cs *engine)
{
struct intel_context *ce =
&engine->i915->preempt_context->engine[engine->id];
u32 __iomem *elsp =
engine->i915->regs + i915_mmio_reg_offset(RING_ELSP(engine));
unsigned int n;
GEM_BUG_ON(engine->i915->preempt_context->hw_id != PREEMPT_ID);
GEM_BUG_ON(!IS_ALIGNED(ce->ring->size, WA_TAIL_BYTES));
memset(ce->ring->vaddr + ce->ring->tail, 0, WA_TAIL_BYTES);
ce->ring->tail += WA_TAIL_BYTES;
ce->ring->tail &= (ce->ring->size - 1);
ce->lrc_reg_state[CTX_RING_TAIL+1] = ce->ring->tail;
for (n = execlists_num_ports(&engine->execlists); --n; )
elsp_write(0, elsp);
elsp_write(ce->lrc_desc, elsp);
}
static bool can_preempt(struct intel_engine_cs *engine)
{
return INTEL_INFO(engine->i915)->has_logical_ring_preemption;
}
static void execlists_dequeue(struct intel_engine_cs *engine)
{
struct intel_engine_execlists * const execlists = &engine->execlists;
struct execlist_port *port = execlists->port;
const struct execlist_port * const last_port =
&execlists->port[execlists->port_mask];
struct drm_i915_gem_request *last = port_request(port);
struct rb_node *rb;
bool submit = false;
/* 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_irq(&engine->timeline->lock);
rb = execlists->first;
GEM_BUG_ON(rb_first(&execlists->queue) != rb);
if (!rb)
goto unlock;
if (last) {
/*
* Don't resubmit or switch until all outstanding
* preemptions (lite-restore) are seen. Then we
* know the next preemption status we see corresponds
* to this ELSP update.
*/
if (port_count(&port[0]) > 1)
goto unlock;
if (can_preempt(engine) &&
rb_entry(rb, struct i915_priolist, node)->priority >
max(last->priotree.priority, 0)) {
/*
* Switch to our empty preempt context so
* the state of the GPU is known (idle).
*/
inject_preempt_context(engine);
execlists_set_active(execlists,
EXECLISTS_ACTIVE_PREEMPT);
goto unlock;
} else {
/*
* In theory, we could coalesce more requests onto
* the second port (the first port is active, with
* no preemptions pending). However, that means we
* then have to deal with the possible lite-restore
* of the second port (as we submit the ELSP, there
* may be a context-switch) but also we may complete
* the resubmission before the context-switch. Ergo,
* coalescing onto the second port will cause a
* preemption event, but we cannot predict whether
* that will affect port[0] or port[1].
*
* If the second port is already active, we can wait
* until the next context-switch before contemplating
* new requests. The GPU will be busy and we should be
* able to resubmit the new ELSP before it idles,
* avoiding pipeline bubbles (momentary pauses where
* the driver is unable to keep up the supply of new
* work).
*/
if (port_count(&port[1]))
goto unlock;
/* 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;
}
}
do {
struct i915_priolist *p = rb_entry(rb, typeof(*p), node);
struct drm_i915_gem_request *rq, *rn;
list_for_each_entry_safe(rq, rn, &p->requests, priotree.link) {
/*
* 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(rq->ctx, last->ctx)) {
/*
* If we are on the second port and cannot
* combine this request with the last, then we
* are done.
*/
if (port == last_port) {
__list_del_many(&p->requests,
&rq->priotree.link);
goto done;
}
/*
* 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(rq->ctx)) {
__list_del_many(&p->requests,
&rq->priotree.link);
goto done;
}
GEM_BUG_ON(last->ctx == rq->ctx);
if (submit)
port_assign(port, last);
port++;
GEM_BUG_ON(port_isset(port));
}
INIT_LIST_HEAD(&rq->priotree.link);
__i915_gem_request_submit(rq);
trace_i915_gem_request_in(rq, port_index(port, execlists));
last = rq;
submit = true;
}
rb = rb_next(rb);
rb_erase(&p->node, &execlists->queue);
INIT_LIST_HEAD(&p->requests);
if (p->priority != I915_PRIORITY_NORMAL)
kmem_cache_free(engine->i915->priorities, p);
} while (rb);
done:
execlists->first = rb;
if (submit)
port_assign(port, last);
unlock:
spin_unlock_irq(&engine->timeline->lock);
if (submit) {
execlists_set_active(execlists, EXECLISTS_ACTIVE_USER);
execlists_submit_ports(engine);
}
}
static void
execlist_cancel_port_requests(struct intel_engine_execlists *execlists)
{
struct execlist_port *port = execlists->port;
unsigned int num_ports = execlists_num_ports(execlists);
while (num_ports-- && port_isset(port)) {
struct drm_i915_gem_request *rq = port_request(port);
GEM_BUG_ON(!execlists->active);
execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_PREEMPTED);
i915_gem_request_put(rq);
memset(port, 0, sizeof(*port));
port++;
}
}
static void execlists_cancel_requests(struct intel_engine_cs *engine)
{
struct intel_engine_execlists * const execlists = &engine->execlists;
struct drm_i915_gem_request *rq, *rn;
struct rb_node *rb;
unsigned long flags;
spin_lock_irqsave(&engine->timeline->lock, flags);
/* Cancel the requests on the HW and clear the ELSP tracker. */
execlist_cancel_port_requests(execlists);
/* Mark all executing requests as skipped. */
list_for_each_entry(rq, &engine->timeline->requests, link) {
GEM_BUG_ON(!rq->global_seqno);
if (!i915_gem_request_completed(rq))
dma_fence_set_error(&rq->fence, -EIO);
}
/* Flush the queued requests to the timeline list (for retiring). */
rb = execlists->first;
while (rb) {
struct i915_priolist *p = rb_entry(rb, typeof(*p), node);
list_for_each_entry_safe(rq, rn, &p->requests, priotree.link) {
INIT_LIST_HEAD(&rq->priotree.link);
dma_fence_set_error(&rq->fence, -EIO);
__i915_gem_request_submit(rq);
}
rb = rb_next(rb);
rb_erase(&p->node, &execlists->queue);
INIT_LIST_HEAD(&p->requests);
if (p->priority != I915_PRIORITY_NORMAL)
kmem_cache_free(engine->i915->priorities, p);
}
/* Remaining _unready_ requests will be nop'ed when submitted */
execlists->queue = RB_ROOT;
execlists->first = NULL;
GEM_BUG_ON(port_isset(execlists->port));
/*
* The port is checked prior to scheduling a tasklet, but
* just in case we have suspended the tasklet to do the
* wedging make sure that when it wakes, it decides there
* is no work to do by clearing the irq_posted bit.
*/
clear_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted);
spin_unlock_irqrestore(&engine->timeline->lock, flags);
}
/*
* 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 * const engine = (struct intel_engine_cs *)data;
struct intel_engine_execlists * const execlists = &engine->execlists;
struct execlist_port * const port = execlists->port;
struct drm_i915_private *dev_priv = engine->i915;
/* We can skip acquiring intel_runtime_pm_get() here as it was taken
* on our behalf by the request (see i915_gem_mark_busy()) and it will
* not be relinquished until the device is idle (see
* i915_gem_idle_work_handler()). As a precaution, we make sure
* that all ELSP are drained i.e. we have processed the CSB,
* before allowing ourselves to idle and calling intel_runtime_pm_put().
*/
GEM_BUG_ON(!dev_priv->gt.awake);
intel_uncore_forcewake_get(dev_priv, execlists->fw_domains);
/* Prefer doing test_and_clear_bit() as a two stage operation to avoid
* imposing the cost of a locked atomic transaction when submitting a
* new request (outside of the context-switch interrupt).
*/
while (test_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted)) {
/* The HWSP contains a (cacheable) mirror of the CSB */
const u32 *buf =
&engine->status_page.page_addr[I915_HWS_CSB_BUF0_INDEX];
unsigned int head, tail;
if (unlikely(execlists->csb_use_mmio)) {
buf = (u32 * __force)
(dev_priv->regs + i915_mmio_reg_offset(RING_CONTEXT_STATUS_BUF_LO(engine, 0)));
execlists->csb_head = -1; /* force mmio read of CSB ptrs */
}
/* The write will be ordered by the uncached read (itself
* a memory barrier), so we do not need another in the form
* of a locked instruction. The race between the interrupt
* handler and the split test/clear is harmless as we order
* our clear before the CSB read. If the interrupt arrived
* first between the test and the clear, we read the updated
* CSB and clear the bit. If the interrupt arrives as we read
* the CSB or later (i.e. after we had cleared the bit) the bit
* is set and we do a new loop.
*/
__clear_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted);
if (unlikely(execlists->csb_head == -1)) { /* following a reset */
head = readl(dev_priv->regs + i915_mmio_reg_offset(RING_CONTEXT_STATUS_PTR(engine)));
tail = GEN8_CSB_WRITE_PTR(head);
head = GEN8_CSB_READ_PTR(head);
execlists->csb_head = head;
} else {
const int write_idx =
intel_hws_csb_write_index(dev_priv) -
I915_HWS_CSB_BUF0_INDEX;
head = execlists->csb_head;
tail = READ_ONCE(buf[write_idx]);
}
while (head != tail) {
struct drm_i915_gem_request *rq;
unsigned int status;
unsigned int count;
if (++head == GEN8_CSB_ENTRIES)
head = 0;
/* We are flying near dragons again.
*
* We hold a reference to the request in execlist_port[]
* but no more than that. We are operating in softirq
* context and so cannot hold any mutex or sleep. That
* prevents us stopping the requests we are processing
* in port[] from being retired simultaneously (the
* breadcrumb will be complete before we see the
* context-switch). As we only hold the reference to the
* request, any pointer chasing underneath the request
* is subject to a potential use-after-free. Thus we
* store all of the bookkeeping within port[] as
* required, and avoid using unguarded pointers beneath
* request itself. The same applies to the atomic
* status notifier.
*/
status = READ_ONCE(buf[2 * head]); /* maybe mmio! */
if (!(status & GEN8_CTX_STATUS_COMPLETED_MASK))
continue;
if (status & GEN8_CTX_STATUS_ACTIVE_IDLE &&
buf[2*head + 1] == PREEMPT_ID) {
execlist_cancel_port_requests(execlists);
spin_lock_irq(&engine->timeline->lock);
unwind_incomplete_requests(engine);
spin_unlock_irq(&engine->timeline->lock);
GEM_BUG_ON(!execlists_is_active(execlists,
EXECLISTS_ACTIVE_PREEMPT));
execlists_clear_active(execlists,
EXECLISTS_ACTIVE_PREEMPT);
continue;
}
if (status & GEN8_CTX_STATUS_PREEMPTED &&
execlists_is_active(execlists,
EXECLISTS_ACTIVE_PREEMPT))
continue;
GEM_BUG_ON(!execlists_is_active(execlists,
EXECLISTS_ACTIVE_USER));
/* Check the context/desc id for this event matches */
GEM_DEBUG_BUG_ON(buf[2 * head + 1] != port->context_id);
rq = port_unpack(port, &count);
GEM_BUG_ON(count == 0);
if (--count == 0) {
GEM_BUG_ON(status & GEN8_CTX_STATUS_PREEMPTED);
GEM_BUG_ON(!i915_gem_request_completed(rq));
execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_OUT);
trace_i915_gem_request_out(rq);
i915_gem_request_put(rq);
execlists_port_complete(execlists, port);
} else {
port_set(port, port_pack(rq, count));
}
/* After the final element, the hw should be idle */
GEM_BUG_ON(port_count(port) == 0 &&
!(status & GEN8_CTX_STATUS_ACTIVE_IDLE));
if (port_count(port) == 0)
execlists_clear_active(execlists,
EXECLISTS_ACTIVE_USER);
}
if (head != execlists->csb_head) {
execlists->csb_head = head;
writel(_MASKED_FIELD(GEN8_CSB_READ_PTR_MASK, head << 8),
dev_priv->regs + i915_mmio_reg_offset(RING_CONTEXT_STATUS_PTR(engine)));
}
}
if (!execlists_is_active(execlists, EXECLISTS_ACTIVE_PREEMPT))
execlists_dequeue(engine);
intel_uncore_forcewake_put(dev_priv, execlists->fw_domains);
}
static void insert_request(struct intel_engine_cs *engine,
struct i915_priotree *pt,
int prio)
{
struct i915_priolist *p = lookup_priolist(engine, pt, prio);
list_add_tail(&pt->link, &ptr_mask_bits(p, 1)->requests);
if (ptr_unmask_bits(p, 1))
tasklet_hi_schedule(&engine->execlists.irq_tasklet);
}
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);
insert_request(engine, &request->priotree, request->priotree.priority);
GEM_BUG_ON(!engine->execlists.first);
GEM_BUG_ON(list_empty(&request->priotree.link));
spin_unlock_irqrestore(&engine->timeline->lock, flags);
}
static struct drm_i915_gem_request *pt_to_request(struct i915_priotree *pt)
{
return container_of(pt, struct drm_i915_gem_request, priotree);
}
static struct intel_engine_cs *
pt_lock_engine(struct i915_priotree *pt, struct intel_engine_cs *locked)
{
struct intel_engine_cs *engine = pt_to_request(pt)->engine;
GEM_BUG_ON(!locked);
if (engine != locked) {
spin_unlock(&locked->timeline->lock);
spin_lock(&engine->timeline->lock);
}
return engine;
}
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);
GEM_BUG_ON(prio == I915_PRIORITY_INVALID);
if (i915_gem_request_completed(request))
return;
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) {
if (i915_gem_request_completed(pt_to_request(p->signaler)))
continue;
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);
}
/* If we didn't need to bump any existing priorities, and we haven't
* yet submitted this request (i.e. there is no potential race with
* execlists_submit_request()), we can set our own priority and skip
* acquiring the engine locks.
*/
if (request->priotree.priority == I915_PRIORITY_INVALID) {
GEM_BUG_ON(!list_empty(&request->priotree.link));
request->priotree.priority = prio;
if (stack.dfs_link.next == stack.dfs_link.prev)
return;
__list_del_entry(&stack.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 (!list_empty(&pt->link)) {
__list_del_entry(&pt->link);
insert_request(engine, pt, prio);
}
}
spin_unlock_irq(&engine->timeline->lock);
}
static struct intel_ring *
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 (likely(ce->pin_count++))
goto out;
GEM_BUG_ON(!ce->pin_count); /* no overflow please! */
if (!ce->state) {
ret = execlists_context_deferred_alloc(ctx, engine);
if (ret)
goto err;
}
GEM_BUG_ON(!ce->state);
flags = PIN_GLOBAL | PIN_HIGH;
if (ctx->ggtt_offset_bias)
flags |= PIN_OFFSET_BIAS | ctx->ggtt_offset_bias;
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->i915, 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;
ce->state->obj->pin_global++;
i915_gem_context_get(ctx);
out:
return ce->ring;
unpin_map:
i915_gem_object_unpin_map(ce->state->obj);
unpin_vma:
__i915_vma_unpin(ce->state);
err:
ce->pin_count = 0;
return ERR_PTR(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);
ce->state->obj->pin_global--;
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];
u32 *cs;
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;
cs = intel_ring_begin(request, 0);
if (IS_ERR(cs))
return PTR_ERR(cs);
if (!ce->initialised) {
ret = engine->init_context(request);
if (ret)
return ret;
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;
}
/*
* 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 u32 *
gen8_emit_flush_coherentl3_wa(struct intel_engine_cs *engine, u32 *batch)
{
*batch++ = MI_STORE_REGISTER_MEM_GEN8 | MI_SRM_LRM_GLOBAL_GTT;
*batch++ = i915_mmio_reg_offset(GEN8_L3SQCREG4);
*batch++ = i915_ggtt_offset(engine->scratch) + 256;
*batch++ = 0;
*batch++ = MI_LOAD_REGISTER_IMM(1);
*batch++ = i915_mmio_reg_offset(GEN8_L3SQCREG4);
*batch++ = 0x40400000 | GEN8_LQSC_FLUSH_COHERENT_LINES;
batch = gen8_emit_pipe_control(batch,
PIPE_CONTROL_CS_STALL |
PIPE_CONTROL_DC_FLUSH_ENABLE,
0);
*batch++ = MI_LOAD_REGISTER_MEM_GEN8 | MI_SRM_LRM_GLOBAL_GTT;
*batch++ = i915_mmio_reg_offset(GEN8_L3SQCREG4);
*batch++ = i915_ggtt_offset(engine->scratch) + 256;
*batch++ = 0;
return batch;
}
/*
* 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 u32 *gen8_init_indirectctx_bb(struct intel_engine_cs *engine, u32 *batch)
{
/* WaDisableCtxRestoreArbitration:bdw,chv */
*batch++ = MI_ARB_ON_OFF | MI_ARB_DISABLE;
/* WaFlushCoherentL3CacheLinesAtContextSwitch:bdw */
if (IS_BROADWELL(engine->i915))
batch = gen8_emit_flush_coherentl3_wa(engine, batch);
/* WaClearSlmSpaceAtContextSwitch:bdw,chv */
/* Actual scratch location is at 128 bytes offset */
batch = gen8_emit_pipe_control(batch,
PIPE_CONTROL_FLUSH_L3 |
PIPE_CONTROL_GLOBAL_GTT_IVB |
PIPE_CONTROL_CS_STALL |
PIPE_CONTROL_QW_WRITE,
i915_ggtt_offset(engine->scratch) +
2 * CACHELINE_BYTES);
*batch++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
/* Pad to end of cacheline */
while ((unsigned long)batch % CACHELINE_BYTES)
*batch++ = 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 batch;
}
static u32 *gen9_init_indirectctx_bb(struct intel_engine_cs *engine, u32 *batch)
{
*batch++ = MI_ARB_ON_OFF | MI_ARB_DISABLE;
/* WaFlushCoherentL3CacheLinesAtContextSwitch:skl,bxt,glk */
batch = gen8_emit_flush_coherentl3_wa(engine, batch);
/* WaDisableGatherAtSetShaderCommonSlice:skl,bxt,kbl,glk */
*batch++ = MI_LOAD_REGISTER_IMM(1);
*batch++ = i915_mmio_reg_offset(COMMON_SLICE_CHICKEN2);
*batch++ = _MASKED_BIT_DISABLE(
GEN9_DISABLE_GATHER_AT_SET_SHADER_COMMON_SLICE);
*batch++ = MI_NOOP;
/* WaClearSlmSpaceAtContextSwitch:kbl */
/* Actual scratch location is at 128 bytes offset */
if (IS_KBL_REVID(engine->i915, 0, KBL_REVID_A0)) {
batch = gen8_emit_pipe_control(batch,
PIPE_CONTROL_FLUSH_L3 |
PIPE_CONTROL_GLOBAL_GTT_IVB |
PIPE_CONTROL_CS_STALL |
PIPE_CONTROL_QW_WRITE,
i915_ggtt_offset(engine->scratch)
+ 2 * CACHELINE_BYTES);
}
/* 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.
*/
*batch++ = GEN9_MEDIA_POOL_STATE;
*batch++ = GEN9_MEDIA_POOL_ENABLE;
*batch++ = 0x00777000;
*batch++ = 0;
*batch++ = 0;
*batch++ = 0;
}
*batch++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
/* Pad to end of cacheline */
while ((unsigned long)batch % CACHELINE_BYTES)
*batch++ = MI_NOOP;
return batch;
}
#define CTX_WA_BB_OBJ_SIZE (PAGE_SIZE)
static int lrc_setup_wa_ctx(struct intel_engine_cs *engine)
{
struct drm_i915_gem_object *obj;
struct i915_vma *vma;
int err;
obj = i915_gem_object_create(engine->i915, CTX_WA_BB_OBJ_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(struct intel_engine_cs *engine)
{
i915_vma_unpin_and_release(&engine->wa_ctx.vma);
}
typedef u32 *(*wa_bb_func_t)(struct intel_engine_cs *engine, u32 *batch);
static int intel_init_workaround_bb(struct intel_engine_cs *engine)
{
struct i915_ctx_workarounds *wa_ctx = &engine->wa_ctx;
struct i915_wa_ctx_bb *wa_bb[2] = { &wa_ctx->indirect_ctx,
&wa_ctx->per_ctx };
wa_bb_func_t wa_bb_fn[2];
struct page *page;
void *batch, *batch_ptr;
unsigned int i;
int ret;
if (WARN_ON(engine->id != RCS || !engine->scratch))
return -EINVAL;
switch (INTEL_GEN(engine->i915)) {
case 10:
return 0;
case 9:
wa_bb_fn[0] = gen9_init_indirectctx_bb;
wa_bb_fn[1] = NULL;
break;
case 8:
wa_bb_fn[0] = gen8_init_indirectctx_bb;
wa_bb_fn[1] = NULL;
break;
default:
MISSING_CASE(INTEL_GEN(engine->i915));
return 0;
}
ret = lrc_setup_wa_ctx(engine);
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 = batch_ptr = kmap_atomic(page);
/*
* Emit the two workaround batch buffers, recording the offset from the
* start of the workaround batch buffer object for each and their
* respective sizes.
*/
for (i = 0; i < ARRAY_SIZE(wa_bb_fn); i++) {
wa_bb[i]->offset = batch_ptr - batch;
if (WARN_ON(!IS_ALIGNED(wa_bb[i]->offset, CACHELINE_BYTES))) {
ret = -EINVAL;
break;
}
if (wa_bb_fn[i])
batch_ptr = wa_bb_fn[i](engine, batch_ptr);
wa_bb[i]->size = batch_ptr - (batch + wa_bb[i]->offset);
}
BUG_ON(batch_ptr - batch > CTX_WA_BB_OBJ_SIZE);
kunmap_atomic(batch);
if (ret)
lrc_destroy_wa_ctx(engine);
return ret;
}
static u8 gtiir[] = {
[RCS] = 0,
[BCS] = 0,
[VCS] = 1,
[VCS2] = 1,
[VECS] = 3,
};
static int gen8_init_common_ring(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
struct intel_engine_execlists * const execlists = &engine->execlists;
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_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);
GEM_BUG_ON(engine->id >= ARRAY_SIZE(gtiir));
/*
* Clear any pending interrupt state.
*
* We do it twice out of paranoia that some of the IIR are double
* buffered, and if we only reset it once there may still be
* an interrupt pending.
*/
I915_WRITE(GEN8_GT_IIR(gtiir[engine->id]),
GT_CONTEXT_SWITCH_INTERRUPT << engine->irq_shift);
I915_WRITE(GEN8_GT_IIR(gtiir[engine->id]),
GT_CONTEXT_SWITCH_INTERRUPT << engine->irq_shift);
clear_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted);
execlists->csb_head = -1;
execlists->active = 0;
/* After a GPU reset, we may have requests to replay */
if (!i915_modparams.enable_guc_submission && execlists->first)
tasklet_schedule(&execlists->irq_tasklet);
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 intel_engine_execlists * const execlists = &engine->execlists;
struct intel_context *ce;
unsigned long flags;
spin_lock_irqsave(&engine->timeline->lock, flags);
/*
* Catch up with any missed context-switch interrupts.
*
* Ideally we would just read the remaining CSB entries now that we
* know the gpu is idle. However, the CSB registers are sometimes^W
* often trashed across a GPU reset! Instead we have to rely on
* guessing the missed context-switch events by looking at what
* requests were completed.
*/
execlist_cancel_port_requests(execlists);
/* Push back any incomplete requests for replay after the reset. */
unwind_incomplete_requests(engine);
spin_unlock_irqrestore(&engine->timeline->lock, flags);
/* 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;
intel_ring_update_space(request->ring);
/* Reset WaIdleLiteRestore:bdw,skl as well */
unwind_wa_tail(request);
}
static int intel_logical_ring_emit_pdps(struct drm_i915_gem_request *req)
{
struct i915_hw_ppgtt *ppgtt = req->ctx->ppgtt;
struct intel_engine_cs *engine = req->engine;
const int num_lri_cmds = GEN8_3LVL_PDPES * 2;
u32 *cs;
int i;
cs = intel_ring_begin(req, num_lri_cmds * 2 + 2);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = MI_LOAD_REGISTER_IMM(num_lri_cmds);
for (i = GEN8_3LVL_PDPES - 1; i >= 0; i--) {
const dma_addr_t pd_daddr = i915_page_dir_dma_addr(ppgtt, i);
*cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_UDW(engine, i));
*cs++ = upper_32_bits(pd_daddr);
*cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_LDW(engine, i));
*cs++ = lower_32_bits(pd_daddr);
}
*cs++ = MI_NOOP;
intel_ring_advance(req, cs);
return 0;
}
static int gen8_emit_bb_start(struct drm_i915_gem_request *req,
u64 offset, u32 len,
const unsigned int flags)
{
u32 *cs;
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) &&
!i915_vm_is_48bit(&req->ctx->ppgtt->base) &&
!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);
}
cs = intel_ring_begin(req, 4);
if (IS_ERR(cs))
return PTR_ERR(cs);
/*
* WaDisableCtxRestoreArbitration:bdw,chv
*
* We don't need to perform MI_ARB_ENABLE as often as we do (in
* particular all the gen that do not need the w/a at all!), if we
* took care to make sure that on every switch into this context
* (both ordinary and for preemption) that arbitrartion was enabled
* we would be fine. However, there doesn't seem to be a downside to
* being paranoid and making sure it is set before each batch and
* every context-switch.
*
* Note that if we fail to enable arbitration before the request
* is complete, then we do not see the context-switch interrupt and
* the engine hangs (with RING_HEAD == RING_TAIL).
*
* That satisfies both the GPGPU w/a and our heavy-handed paranoia.
*/
*cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
/* FIXME(BDW): Address space and security selectors. */
*cs++ = MI_BATCH_BUFFER_START_GEN8 |
(flags & I915_DISPATCH_SECURE ? 0 : BIT(8)) |
(flags & I915_DISPATCH_RS ? MI_BATCH_RESOURCE_STREAMER : 0);
*cs++ = lower_32_bits(offset);
*cs++ = upper_32_bits(offset);
intel_ring_advance(req, cs);
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)
{
u32 cmd, *cs;
cs = intel_ring_begin(request, 4);
if (IS_ERR(cs))
return PTR_ERR(cs);
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;
}
*cs++ = cmd;
*cs++ = I915_GEM_HWS_SCRATCH_ADDR | MI_FLUSH_DW_USE_GTT;
*cs++ = 0; /* upper addr */
*cs++ = 0; /* value */
intel_ring_advance(request, cs);
return 0;
}
static int gen8_emit_flush_render(struct drm_i915_gem_request *request,
u32 mode)
{
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 *cs, flags = 0;
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;
cs = intel_ring_begin(request, len);
if (IS_ERR(cs))
return PTR_ERR(cs);
if (vf_flush_wa)
cs = gen8_emit_pipe_control(cs, 0, 0);
if (dc_flush_wa)
cs = gen8_emit_pipe_control(cs, PIPE_CONTROL_DC_FLUSH_ENABLE,
0);
cs = gen8_emit_pipe_control(cs, flags, scratch_addr);
if (dc_flush_wa)
cs = gen8_emit_pipe_control(cs, PIPE_CONTROL_CS_STALL, 0);
intel_ring_advance(request, cs);
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 *cs)
{
/* Ensure there's always at least one preemption point per-request. */
*cs++ = MI_ARB_CHECK;
*cs++ = MI_NOOP;
request->wa_tail = intel_ring_offset(request, cs);
}
static void gen8_emit_breadcrumb(struct drm_i915_gem_request *request, u32 *cs)
{
/* w/a: bit 5 needs to be zero for MI_FLUSH_DW address. */
BUILD_BUG_ON(I915_GEM_HWS_INDEX_ADDR & (1 << 5));
*cs++ = (MI_FLUSH_DW + 1) | MI_FLUSH_DW_OP_STOREDW;
*cs++ = intel_hws_seqno_address(request->engine) | MI_FLUSH_DW_USE_GTT;
*cs++ = 0;
*cs++ = request->global_seqno;
*cs++ = MI_USER_INTERRUPT;
*cs++ = MI_NOOP;
request->tail = intel_ring_offset(request, cs);
assert_ring_tail_valid(request->ring, request->tail);
gen8_emit_wa_tail(request, cs);
}
static const int gen8_emit_breadcrumb_sz = 6 + WA_TAIL_DWORDS;
static void gen8_emit_breadcrumb_render(struct drm_i915_gem_request *request,
u32 *cs)
{
/* 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.
*/
*cs++ = GFX_OP_PIPE_CONTROL(6);
*cs++ = PIPE_CONTROL_GLOBAL_GTT_IVB | PIPE_CONTROL_CS_STALL |
PIPE_CONTROL_QW_WRITE;
*cs++ = intel_hws_seqno_address(request->engine);
*cs++ = 0;
*cs++ = request->global_seqno;
/* We're thrashing one dword of HWS. */
*cs++ = 0;
*cs++ = MI_USER_INTERRUPT;
*cs++ = MI_NOOP;
request->tail = intel_ring_offset(request, cs);
assert_ring_tail_valid(request->ring, request->tail);
gen8_emit_wa_tail(request, cs);
}
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_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->execlists.irq_tasklet.state)))
tasklet_kill(&engine->execlists.irq_tasklet);
dev_priv = engine->i915;
if (engine->buffer) {
WARN_ON((I915_READ_MODE(engine) & MODE_IDLE) == 0);
}
if (engine->cleanup)
engine->cleanup(engine);
intel_engine_cleanup_common(engine);
lrc_destroy_wa_ctx(engine);
engine->i915 = NULL;
dev_priv->engine[engine->id] = NULL;
kfree(engine);
}
static void execlists_set_default_submission(struct intel_engine_cs *engine)
{
engine->submit_request = execlists_submit_request;
engine->cancel_requests = execlists_cancel_requests;
engine->schedule = execlists_schedule;
engine->execlists.irq_tasklet.func = intel_lrc_irq_handler;
}
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->set_default_submission = execlists_set_default_submission;
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 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->execlists.fw_domains = fw_domains;
tasklet_init(&engine->execlists.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)
{
int ret;
ret = intel_engine_init_common(engine);
if (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 10:
indirect_ctx_offset =
GEN10_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT;
break;
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 *regs,
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;
u32 base = engine->mmio_base;
bool rcs = engine->id == RCS;
/* 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).
*/
regs[CTX_LRI_HEADER_0] = MI_LOAD_REGISTER_IMM(rcs ? 14 : 11) |
MI_LRI_FORCE_POSTED;
CTX_REG(regs, 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)));
CTX_REG(regs, CTX_RING_HEAD, RING_HEAD(base), 0);
CTX_REG(regs, CTX_RING_TAIL, RING_TAIL(base), 0);
CTX_REG(regs, CTX_RING_BUFFER_START, RING_START(base), 0);
CTX_REG(regs, CTX_RING_BUFFER_CONTROL, RING_CTL(base),
RING_CTL_SIZE(ring->size) | RING_VALID);
CTX_REG(regs, CTX_BB_HEAD_U, RING_BBADDR_UDW(base), 0);
CTX_REG(regs, CTX_BB_HEAD_L, RING_BBADDR(base), 0);
CTX_REG(regs, CTX_BB_STATE, RING_BBSTATE(base), RING_BB_PPGTT);
CTX_REG(regs, CTX_SECOND_BB_HEAD_U, RING_SBBADDR_UDW(base), 0);
CTX_REG(regs, CTX_SECOND_BB_HEAD_L, RING_SBBADDR(base), 0);
CTX_REG(regs, CTX_SECOND_BB_STATE, RING_SBBSTATE(base), 0);
if (rcs) {
struct i915_ctx_workarounds *wa_ctx = &engine->wa_ctx;
CTX_REG(regs, CTX_RCS_INDIRECT_CTX, RING_INDIRECT_CTX(base), 0);
CTX_REG(regs, CTX_RCS_INDIRECT_CTX_OFFSET,
RING_INDIRECT_CTX_OFFSET(base), 0);
if (wa_ctx->indirect_ctx.size) {
u32 ggtt_offset = i915_ggtt_offset(wa_ctx->vma);
regs[CTX_RCS_INDIRECT_CTX + 1] =
(ggtt_offset + wa_ctx->indirect_ctx.offset) |
(wa_ctx->indirect_ctx.size / CACHELINE_BYTES);
regs[CTX_RCS_INDIRECT_CTX_OFFSET + 1] =
intel_lr_indirect_ctx_offset(engine) << 6;
}
CTX_REG(regs, CTX_BB_PER_CTX_PTR, RING_BB_PER_CTX_PTR(base), 0);
if (wa_ctx->per_ctx.size) {
u32 ggtt_offset = i915_ggtt_offset(wa_ctx->vma);
regs[CTX_BB_PER_CTX_PTR + 1] =
(ggtt_offset + wa_ctx->per_ctx.offset) | 0x01;
}
}
regs[CTX_LRI_HEADER_1] = MI_LOAD_REGISTER_IMM(9) | MI_LRI_FORCE_POSTED;
CTX_REG(regs, CTX_CTX_TIMESTAMP, RING_CTX_TIMESTAMP(base), 0);
/* PDP values well be assigned later if needed */
CTX_REG(regs, CTX_PDP3_UDW, GEN8_RING_PDP_UDW(engine, 3), 0);
CTX_REG(regs, CTX_PDP3_LDW, GEN8_RING_PDP_LDW(engine, 3), 0);
CTX_REG(regs, CTX_PDP2_UDW, GEN8_RING_PDP_UDW(engine, 2), 0);
CTX_REG(regs, CTX_PDP2_LDW, GEN8_RING_PDP_LDW(engine, 2), 0);
CTX_REG(regs, CTX_PDP1_UDW, GEN8_RING_PDP_UDW(engine, 1), 0);
CTX_REG(regs, CTX_PDP1_LDW, GEN8_RING_PDP_LDW(engine, 1), 0);
CTX_REG(regs, CTX_PDP0_UDW, GEN8_RING_PDP_UDW(engine, 0), 0);
CTX_REG(regs, CTX_PDP0_LDW, GEN8_RING_PDP_LDW(engine, 0), 0);
if (ppgtt && i915_vm_is_48bit(&ppgtt->base)) {
/* 64b PPGTT (48bit canonical)
* PDP0_DESCRIPTOR contains the base address to PML4 and
* other PDP Descriptors are ignored.
*/
ASSIGN_CTX_PML4(ppgtt, regs);
}
if (rcs) {
regs[CTX_LRI_HEADER_2] = MI_LOAD_REGISTER_IMM(1);
CTX_REG(regs, CTX_R_PWR_CLK_STATE, GEN8_R_PWR_CLK_STATE,
make_rpcs(dev_priv));
i915_oa_init_reg_state(engine, ctx, regs);
}
}
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;
}
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(engine->context_size, I915_GTT_PAGE_SIZE);
/*
* Before the actual start of the context image, we insert a few pages
* for our own use and for sharing with the GuC.
*/
context_size += LRC_HEADER_PAGES * PAGE_SIZE;
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->contexts.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);
intel_ring_reset(ce->ring, 0);
}
}
}
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