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linux-zen-server/drivers/gpu/drm/i915/gt/intel_ring_submission.c

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// SPDX-License-Identifier: MIT
/*
* Copyright © 2008-2021 Intel Corporation
*/
#include <drm/drm_cache.h>
#include "gem/i915_gem_internal.h"
#include "gen2_engine_cs.h"
#include "gen6_engine_cs.h"
#include "gen6_ppgtt.h"
#include "gen7_renderclear.h"
#include "i915_drv.h"
#include "i915_irq.h"
#include "i915_mitigations.h"
#include "i915_reg.h"
#include "intel_breadcrumbs.h"
#include "intel_context.h"
#include "intel_engine_regs.h"
#include "intel_gt.h"
#include "intel_gt_irq.h"
#include "intel_gt_regs.h"
#include "intel_reset.h"
#include "intel_ring.h"
#include "shmem_utils.h"
#include "intel_engine_heartbeat.h"
#include "intel_engine_pm.h"
/* Rough estimate of the typical request size, performing a flush,
* set-context and then emitting the batch.
*/
#define LEGACY_REQUEST_SIZE 200
static void set_hwstam(struct intel_engine_cs *engine, u32 mask)
{
/*
* Keep the render interrupt unmasked as this papers over
* lost interrupts following a reset.
*/
if (engine->class == RENDER_CLASS) {
if (GRAPHICS_VER(engine->i915) >= 6)
mask &= ~BIT(0);
else
mask &= ~I915_USER_INTERRUPT;
}
intel_engine_set_hwsp_writemask(engine, mask);
}
static void set_hws_pga(struct intel_engine_cs *engine, phys_addr_t phys)
{
u32 addr;
addr = lower_32_bits(phys);
if (GRAPHICS_VER(engine->i915) >= 4)
addr |= (phys >> 28) & 0xf0;
intel_uncore_write(engine->uncore, HWS_PGA, addr);
}
static struct page *status_page(struct intel_engine_cs *engine)
{
struct drm_i915_gem_object *obj = engine->status_page.vma->obj;
GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
return sg_page(obj->mm.pages->sgl);
}
static void ring_setup_phys_status_page(struct intel_engine_cs *engine)
{
set_hws_pga(engine, PFN_PHYS(page_to_pfn(status_page(engine))));
set_hwstam(engine, ~0u);
}
static void set_hwsp(struct intel_engine_cs *engine, u32 offset)
{
i915_reg_t hwsp;
/*
* The ring status page addresses are no longer next to the rest of
* the ring registers as of gen7.
*/
if (GRAPHICS_VER(engine->i915) == 7) {
switch (engine->id) {
/*
* No more rings exist on Gen7. Default case is only to shut up
* gcc switch check warning.
*/
default:
GEM_BUG_ON(engine->id);
fallthrough;
case RCS0:
hwsp = RENDER_HWS_PGA_GEN7;
break;
case BCS0:
hwsp = BLT_HWS_PGA_GEN7;
break;
case VCS0:
hwsp = BSD_HWS_PGA_GEN7;
break;
case VECS0:
hwsp = VEBOX_HWS_PGA_GEN7;
break;
}
} else if (GRAPHICS_VER(engine->i915) == 6) {
hwsp = RING_HWS_PGA_GEN6(engine->mmio_base);
} else {
hwsp = RING_HWS_PGA(engine->mmio_base);
}
intel_uncore_write_fw(engine->uncore, hwsp, offset);
intel_uncore_posting_read_fw(engine->uncore, hwsp);
}
static void flush_cs_tlb(struct intel_engine_cs *engine)
{
if (!IS_GRAPHICS_VER(engine->i915, 6, 7))
return;
/* ring should be idle before issuing a sync flush*/
if ((ENGINE_READ(engine, RING_MI_MODE) & MODE_IDLE) == 0)
drm_warn(&engine->i915->drm, "%s not idle before sync flush!\n",
engine->name);
ENGINE_WRITE_FW(engine, RING_INSTPM,
_MASKED_BIT_ENABLE(INSTPM_TLB_INVALIDATE |
INSTPM_SYNC_FLUSH));
if (__intel_wait_for_register_fw(engine->uncore,
RING_INSTPM(engine->mmio_base),
INSTPM_SYNC_FLUSH, 0,
2000, 0, NULL))
ENGINE_TRACE(engine,
"wait for SyncFlush to complete for TLB invalidation timed out\n");
}
static void ring_setup_status_page(struct intel_engine_cs *engine)
{
set_hwsp(engine, i915_ggtt_offset(engine->status_page.vma));
set_hwstam(engine, ~0u);
flush_cs_tlb(engine);
}
static struct i915_address_space *vm_alias(struct i915_address_space *vm)
{
if (i915_is_ggtt(vm))
vm = &i915_vm_to_ggtt(vm)->alias->vm;
return vm;
}
static u32 pp_dir(struct i915_address_space *vm)
{
return to_gen6_ppgtt(i915_vm_to_ppgtt(vm))->pp_dir;
}
static void set_pp_dir(struct intel_engine_cs *engine)
{
struct i915_address_space *vm = vm_alias(engine->gt->vm);
if (!vm)
return;
ENGINE_WRITE_FW(engine, RING_PP_DIR_DCLV, PP_DIR_DCLV_2G);
ENGINE_WRITE_FW(engine, RING_PP_DIR_BASE, pp_dir(vm));
if (GRAPHICS_VER(engine->i915) >= 7) {
ENGINE_WRITE_FW(engine,
RING_MODE_GEN7,
_MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
}
}
static bool stop_ring(struct intel_engine_cs *engine)
{
/* Empty the ring by skipping to the end */
ENGINE_WRITE_FW(engine, RING_HEAD, ENGINE_READ_FW(engine, RING_TAIL));
ENGINE_POSTING_READ(engine, RING_HEAD);
/* The ring must be empty before it is disabled */
ENGINE_WRITE_FW(engine, RING_CTL, 0);
ENGINE_POSTING_READ(engine, RING_CTL);
/* Then reset the disabled ring */
ENGINE_WRITE_FW(engine, RING_HEAD, 0);
ENGINE_WRITE_FW(engine, RING_TAIL, 0);
return (ENGINE_READ_FW(engine, RING_HEAD) & HEAD_ADDR) == 0;
}
static int xcs_resume(struct intel_engine_cs *engine)
{
struct intel_ring *ring = engine->legacy.ring;
ENGINE_TRACE(engine, "ring:{HEAD:%04x, TAIL:%04x}\n",
ring->head, ring->tail);
/*
* Double check the ring is empty & disabled before we resume. Called
* from atomic context during PCI probe, so _hardirq().
*/
intel_synchronize_hardirq(engine->i915);
if (!stop_ring(engine))
goto err;
if (HWS_NEEDS_PHYSICAL(engine->i915))
ring_setup_phys_status_page(engine);
else
ring_setup_status_page(engine);
intel_breadcrumbs_reset(engine->breadcrumbs);
/* Enforce ordering by reading HEAD register back */
ENGINE_POSTING_READ(engine, RING_HEAD);
/*
* Initialize the ring. This must happen _after_ we've cleared the ring
* registers with the above sequence (the readback of the HEAD registers
* also enforces ordering), otherwise the hw might lose the new ring
* register values.
*/
ENGINE_WRITE_FW(engine, RING_START, i915_ggtt_offset(ring->vma));
/* Check that the ring offsets point within the ring! */
GEM_BUG_ON(!intel_ring_offset_valid(ring, ring->head));
GEM_BUG_ON(!intel_ring_offset_valid(ring, ring->tail));
intel_ring_update_space(ring);
set_pp_dir(engine);
/* First wake the ring up to an empty/idle ring */
ENGINE_WRITE_FW(engine, RING_HEAD, ring->head);
ENGINE_WRITE_FW(engine, RING_TAIL, ring->head);
ENGINE_POSTING_READ(engine, RING_TAIL);
ENGINE_WRITE_FW(engine, RING_CTL,
RING_CTL_SIZE(ring->size) | RING_VALID);
/* If the head is still not zero, the ring is dead */
if (__intel_wait_for_register_fw(engine->uncore,
RING_CTL(engine->mmio_base),
RING_VALID, RING_VALID,
5000, 0, NULL))
goto err;
if (GRAPHICS_VER(engine->i915) > 2)
ENGINE_WRITE_FW(engine,
RING_MI_MODE, _MASKED_BIT_DISABLE(STOP_RING));
/* Now awake, let it get started */
if (ring->tail != ring->head) {
ENGINE_WRITE_FW(engine, RING_TAIL, ring->tail);
ENGINE_POSTING_READ(engine, RING_TAIL);
}
/* Papering over lost _interrupts_ immediately following the restart */
intel_engine_signal_breadcrumbs(engine);
return 0;
err:
drm_err(&engine->i915->drm,
"%s initialization failed; "
"ctl %08x (valid? %d) head %08x [%08x] tail %08x [%08x] start %08x [expected %08x]\n",
engine->name,
ENGINE_READ(engine, RING_CTL),
ENGINE_READ(engine, RING_CTL) & RING_VALID,
ENGINE_READ(engine, RING_HEAD), ring->head,
ENGINE_READ(engine, RING_TAIL), ring->tail,
ENGINE_READ(engine, RING_START),
i915_ggtt_offset(ring->vma));
return -EIO;
}
static void sanitize_hwsp(struct intel_engine_cs *engine)
{
struct intel_timeline *tl;
list_for_each_entry(tl, &engine->status_page.timelines, engine_link)
intel_timeline_reset_seqno(tl);
}
static void xcs_sanitize(struct intel_engine_cs *engine)
{
/*
* Poison residual state on resume, in case the suspend didn't!
*
* We have to assume that across suspend/resume (or other loss
* of control) that the contents of our pinned buffers has been
* lost, replaced by garbage. Since this doesn't always happen,
* let's poison such state so that we more quickly spot when
* we falsely assume it has been preserved.
*/
if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM))
memset(engine->status_page.addr, POISON_INUSE, PAGE_SIZE);
/*
* The kernel_context HWSP is stored in the status_page. As above,
* that may be lost on resume/initialisation, and so we need to
* reset the value in the HWSP.
*/
sanitize_hwsp(engine);
/* And scrub the dirty cachelines for the HWSP */
drm_clflush_virt_range(engine->status_page.addr, PAGE_SIZE);
intel_engine_reset_pinned_contexts(engine);
}
static void reset_prepare(struct intel_engine_cs *engine)
{
/*
* We stop engines, otherwise we might get failed reset and a
* dead gpu (on elk). Also as modern gpu as kbl can suffer
* from system hang if batchbuffer is progressing when
* the reset is issued, regardless of READY_TO_RESET ack.
* Thus assume it is best to stop engines on all gens
* where we have a gpu reset.
*
* WaKBLVECSSemaphoreWaitPoll:kbl (on ALL_ENGINES)
*
* WaMediaResetMainRingCleanup:ctg,elk (presumably)
* WaClearRingBufHeadRegAtInit:ctg,elk
*
* FIXME: Wa for more modern gens needs to be validated
*/
ENGINE_TRACE(engine, "\n");
intel_engine_stop_cs(engine);
if (!stop_ring(engine)) {
/* G45 ring initialization often fails to reset head to zero */
ENGINE_TRACE(engine,
"HEAD not reset to zero, "
"{ CTL:%08x, HEAD:%08x, TAIL:%08x, START:%08x }\n",
ENGINE_READ_FW(engine, RING_CTL),
ENGINE_READ_FW(engine, RING_HEAD),
ENGINE_READ_FW(engine, RING_TAIL),
ENGINE_READ_FW(engine, RING_START));
if (!stop_ring(engine)) {
drm_err(&engine->i915->drm,
"failed to set %s head to zero "
"ctl %08x head %08x tail %08x start %08x\n",
engine->name,
ENGINE_READ_FW(engine, RING_CTL),
ENGINE_READ_FW(engine, RING_HEAD),
ENGINE_READ_FW(engine, RING_TAIL),
ENGINE_READ_FW(engine, RING_START));
}
}
}
static void reset_rewind(struct intel_engine_cs *engine, bool stalled)
{
struct i915_request *pos, *rq;
unsigned long flags;
u32 head;
rq = NULL;
spin_lock_irqsave(&engine->sched_engine->lock, flags);
rcu_read_lock();
list_for_each_entry(pos, &engine->sched_engine->requests, sched.link) {
if (!__i915_request_is_complete(pos)) {
rq = pos;
break;
}
}
rcu_read_unlock();
/*
* The guilty request will get skipped on a hung engine.
*
* Users of client default contexts do not rely on logical
* state preserved between batches so it is safe to execute
* queued requests following the hang. Non default contexts
* rely on preserved state, so skipping a batch loses the
* evolution of the state and it needs to be considered corrupted.
* Executing more queued batches on top of corrupted state is
* risky. But we take the risk by trying to advance through
* the queued requests in order to make the client behaviour
* more predictable around resets, by not throwing away random
* amount of batches it has prepared for execution. Sophisticated
* clients can use gem_reset_stats_ioctl and dma fence status
* (exported via sync_file info ioctl on explicit fences) to observe
* when it loses the context state and should rebuild accordingly.
*
* The context ban, and ultimately the client ban, mechanism are safety
* valves if client submission ends up resulting in nothing more than
* subsequent hangs.
*/
if (rq) {
/*
* Try to restore the logical GPU state to match the
* continuation of the request queue. If we skip the
* context/PD restore, then the next request may try to execute
* assuming that its context is valid and loaded on the GPU and
* so may try to access invalid memory, prompting repeated GPU
* hangs.
*
* If the request was guilty, we still restore the logical
* state in case the next request requires it (e.g. the
* aliasing ppgtt), but skip over the hung batch.
*
* If the request was innocent, we try to replay the request
* with the restored context.
*/
__i915_request_reset(rq, stalled);
GEM_BUG_ON(rq->ring != engine->legacy.ring);
head = rq->head;
} else {
head = engine->legacy.ring->tail;
}
engine->legacy.ring->head = intel_ring_wrap(engine->legacy.ring, head);
spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
}
static void reset_finish(struct intel_engine_cs *engine)
{
}
static void reset_cancel(struct intel_engine_cs *engine)
{
struct i915_request *request;
unsigned long flags;
spin_lock_irqsave(&engine->sched_engine->lock, flags);
/* Mark all submitted requests as skipped. */
list_for_each_entry(request, &engine->sched_engine->requests, sched.link)
i915_request_put(i915_request_mark_eio(request));
intel_engine_signal_breadcrumbs(engine);
/* Remaining _unready_ requests will be nop'ed when submitted */
spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
}
static void i9xx_submit_request(struct i915_request *request)
{
i915_request_submit(request);
wmb(); /* paranoid flush writes out of the WCB before mmio */
ENGINE_WRITE(request->engine, RING_TAIL,
intel_ring_set_tail(request->ring, request->tail));
}
static void __ring_context_fini(struct intel_context *ce)
{
i915_vma_put(ce->state);
}
static void ring_context_destroy(struct kref *ref)
{
struct intel_context *ce = container_of(ref, typeof(*ce), ref);
GEM_BUG_ON(intel_context_is_pinned(ce));
if (ce->state)
__ring_context_fini(ce);
intel_context_fini(ce);
intel_context_free(ce);
}
static int ring_context_init_default_state(struct intel_context *ce,
struct i915_gem_ww_ctx *ww)
{
struct drm_i915_gem_object *obj = ce->state->obj;
void *vaddr;
vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB);
if (IS_ERR(vaddr))
return PTR_ERR(vaddr);
shmem_read(ce->engine->default_state, 0,
vaddr, ce->engine->context_size);
i915_gem_object_flush_map(obj);
__i915_gem_object_release_map(obj);
__set_bit(CONTEXT_VALID_BIT, &ce->flags);
return 0;
}
static int ring_context_pre_pin(struct intel_context *ce,
struct i915_gem_ww_ctx *ww,
void **unused)
{
struct i915_address_space *vm;
int err = 0;
if (ce->engine->default_state &&
!test_bit(CONTEXT_VALID_BIT, &ce->flags)) {
err = ring_context_init_default_state(ce, ww);
if (err)
return err;
}
vm = vm_alias(ce->vm);
if (vm)
err = gen6_ppgtt_pin(i915_vm_to_ppgtt((vm)), ww);
return err;
}
static void __context_unpin_ppgtt(struct intel_context *ce)
{
struct i915_address_space *vm;
vm = vm_alias(ce->vm);
if (vm)
gen6_ppgtt_unpin(i915_vm_to_ppgtt(vm));
}
static void ring_context_unpin(struct intel_context *ce)
{
}
static void ring_context_post_unpin(struct intel_context *ce)
{
__context_unpin_ppgtt(ce);
}
static struct i915_vma *
alloc_context_vma(struct intel_engine_cs *engine)
{
struct drm_i915_private *i915 = engine->i915;
struct drm_i915_gem_object *obj;
struct i915_vma *vma;
int err;
obj = i915_gem_object_create_shmem(i915, engine->context_size);
if (IS_ERR(obj))
return ERR_CAST(obj);
/*
* Try to make the context utilize L3 as well as LLC.
*
* On VLV we don't have L3 controls in the PTEs so we
* shouldn't touch the cache level, especially as that
* would make the object snooped which might have a
* negative performance impact.
*
* Snooping is required on non-llc platforms in execlist
* mode, but since all GGTT accesses use PAT entry 0 we
* get snooping anyway regardless of cache_level.
*
* This is only applicable for Ivy Bridge devices since
* later platforms don't have L3 control bits in the PTE.
*/
if (IS_IVYBRIDGE(i915))
i915_gem_object_set_cache_coherency(obj, I915_CACHE_L3_LLC);
vma = i915_vma_instance(obj, &engine->gt->ggtt->vm, NULL);
if (IS_ERR(vma)) {
err = PTR_ERR(vma);
goto err_obj;
}
return vma;
err_obj:
i915_gem_object_put(obj);
return ERR_PTR(err);
}
static int ring_context_alloc(struct intel_context *ce)
{
struct intel_engine_cs *engine = ce->engine;
/* One ringbuffer to rule them all */
GEM_BUG_ON(!engine->legacy.ring);
ce->ring = engine->legacy.ring;
ce->timeline = intel_timeline_get(engine->legacy.timeline);
GEM_BUG_ON(ce->state);
if (engine->context_size) {
struct i915_vma *vma;
vma = alloc_context_vma(engine);
if (IS_ERR(vma))
return PTR_ERR(vma);
ce->state = vma;
}
return 0;
}
static int ring_context_pin(struct intel_context *ce, void *unused)
{
return 0;
}
static void ring_context_reset(struct intel_context *ce)
{
intel_ring_reset(ce->ring, ce->ring->emit);
clear_bit(CONTEXT_VALID_BIT, &ce->flags);
}
static void ring_context_revoke(struct intel_context *ce,
struct i915_request *rq,
unsigned int preempt_timeout_ms)
{
struct intel_engine_cs *engine;
if (!rq || !i915_request_is_active(rq))
return;
engine = rq->engine;
lockdep_assert_held(&engine->sched_engine->lock);
list_for_each_entry_continue(rq, &engine->sched_engine->requests,
sched.link)
if (rq->context == ce) {
i915_request_set_error_once(rq, -EIO);
__i915_request_skip(rq);
}
}
static void ring_context_cancel_request(struct intel_context *ce,
struct i915_request *rq)
{
struct intel_engine_cs *engine = NULL;
i915_request_active_engine(rq, &engine);
if (engine && intel_engine_pulse(engine))
intel_gt_handle_error(engine->gt, engine->mask, 0,
"request cancellation by %s",
current->comm);
}
static const struct intel_context_ops ring_context_ops = {
.alloc = ring_context_alloc,
.cancel_request = ring_context_cancel_request,
.revoke = ring_context_revoke,
.pre_pin = ring_context_pre_pin,
.pin = ring_context_pin,
.unpin = ring_context_unpin,
.post_unpin = ring_context_post_unpin,
.enter = intel_context_enter_engine,
.exit = intel_context_exit_engine,
.reset = ring_context_reset,
.destroy = ring_context_destroy,
};
static int load_pd_dir(struct i915_request *rq,
struct i915_address_space *vm,
u32 valid)
{
const struct intel_engine_cs * const engine = rq->engine;
u32 *cs;
cs = intel_ring_begin(rq, 12);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = MI_LOAD_REGISTER_IMM(1);
*cs++ = i915_mmio_reg_offset(RING_PP_DIR_DCLV(engine->mmio_base));
*cs++ = valid;
*cs++ = MI_LOAD_REGISTER_IMM(1);
*cs++ = i915_mmio_reg_offset(RING_PP_DIR_BASE(engine->mmio_base));
*cs++ = pp_dir(vm);
/* Stall until the page table load is complete? */
*cs++ = MI_STORE_REGISTER_MEM | MI_SRM_LRM_GLOBAL_GTT;
*cs++ = i915_mmio_reg_offset(RING_PP_DIR_BASE(engine->mmio_base));
*cs++ = intel_gt_scratch_offset(engine->gt,
INTEL_GT_SCRATCH_FIELD_DEFAULT);
*cs++ = MI_LOAD_REGISTER_IMM(1);
*cs++ = i915_mmio_reg_offset(RING_INSTPM(engine->mmio_base));
*cs++ = _MASKED_BIT_ENABLE(INSTPM_TLB_INVALIDATE);
intel_ring_advance(rq, cs);
return rq->engine->emit_flush(rq, EMIT_FLUSH);
}
static int mi_set_context(struct i915_request *rq,
struct intel_context *ce,
u32 flags)
{
struct intel_engine_cs *engine = rq->engine;
struct drm_i915_private *i915 = engine->i915;
enum intel_engine_id id;
const int num_engines =
IS_HASWELL(i915) ? engine->gt->info.num_engines - 1 : 0;
bool force_restore = false;
int len;
u32 *cs;
len = 4;
if (GRAPHICS_VER(i915) == 7)
len += 2 + (num_engines ? 4 * num_engines + 6 : 0);
else if (GRAPHICS_VER(i915) == 5)
len += 2;
if (flags & MI_FORCE_RESTORE) {
GEM_BUG_ON(flags & MI_RESTORE_INHIBIT);
flags &= ~MI_FORCE_RESTORE;
force_restore = true;
len += 2;
}
cs = intel_ring_begin(rq, len);
if (IS_ERR(cs))
return PTR_ERR(cs);
/* WaProgramMiArbOnOffAroundMiSetContext:ivb,vlv,hsw,bdw,chv */
if (GRAPHICS_VER(i915) == 7) {
*cs++ = MI_ARB_ON_OFF | MI_ARB_DISABLE;
if (num_engines) {
struct intel_engine_cs *signaller;
*cs++ = MI_LOAD_REGISTER_IMM(num_engines);
for_each_engine(signaller, engine->gt, id) {
if (signaller == engine)
continue;
*cs++ = i915_mmio_reg_offset(
RING_PSMI_CTL(signaller->mmio_base));
*cs++ = _MASKED_BIT_ENABLE(
GEN6_PSMI_SLEEP_MSG_DISABLE);
}
}
} else if (GRAPHICS_VER(i915) == 5) {
/*
* This w/a is only listed for pre-production ilk a/b steppings,
* but is also mentioned for programming the powerctx. To be
* safe, just apply the workaround; we do not use SyncFlush so
* this should never take effect and so be a no-op!
*/
*cs++ = MI_SUSPEND_FLUSH | MI_SUSPEND_FLUSH_EN;
}
if (force_restore) {
/*
* The HW doesn't handle being told to restore the current
* context very well. Quite often it likes goes to go off and
* sulk, especially when it is meant to be reloading PP_DIR.
* A very simple fix to force the reload is to simply switch
* away from the current context and back again.
*
* Note that the kernel_context will contain random state
* following the INHIBIT_RESTORE. We accept this since we
* never use the kernel_context state; it is merely a
* placeholder we use to flush other contexts.
*/
*cs++ = MI_SET_CONTEXT;
*cs++ = i915_ggtt_offset(engine->kernel_context->state) |
MI_MM_SPACE_GTT |
MI_RESTORE_INHIBIT;
}
*cs++ = MI_NOOP;
*cs++ = MI_SET_CONTEXT;
*cs++ = i915_ggtt_offset(ce->state) | flags;
/*
* w/a: MI_SET_CONTEXT must always be followed by MI_NOOP
* WaMiSetContext_Hang:snb,ivb,vlv
*/
*cs++ = MI_NOOP;
if (GRAPHICS_VER(i915) == 7) {
if (num_engines) {
struct intel_engine_cs *signaller;
i915_reg_t last_reg = INVALID_MMIO_REG; /* keep gcc quiet */
*cs++ = MI_LOAD_REGISTER_IMM(num_engines);
for_each_engine(signaller, engine->gt, id) {
if (signaller == engine)
continue;
last_reg = RING_PSMI_CTL(signaller->mmio_base);
*cs++ = i915_mmio_reg_offset(last_reg);
*cs++ = _MASKED_BIT_DISABLE(
GEN6_PSMI_SLEEP_MSG_DISABLE);
}
/* Insert a delay before the next switch! */
*cs++ = MI_STORE_REGISTER_MEM | MI_SRM_LRM_GLOBAL_GTT;
*cs++ = i915_mmio_reg_offset(last_reg);
*cs++ = intel_gt_scratch_offset(engine->gt,
INTEL_GT_SCRATCH_FIELD_DEFAULT);
*cs++ = MI_NOOP;
}
*cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
} else if (GRAPHICS_VER(i915) == 5) {
*cs++ = MI_SUSPEND_FLUSH;
}
intel_ring_advance(rq, cs);
return 0;
}
static int remap_l3_slice(struct i915_request *rq, int slice)
{
#define L3LOG_DW (GEN7_L3LOG_SIZE / sizeof(u32))
u32 *cs, *remap_info = rq->engine->i915->l3_parity.remap_info[slice];
int i;
if (!remap_info)
return 0;
cs = intel_ring_begin(rq, L3LOG_DW * 2 + 2);
if (IS_ERR(cs))
return PTR_ERR(cs);
/*
* Note: We do not worry about the concurrent register cacheline hang
* here because no other code should access these registers other than
* at initialization time.
*/
*cs++ = MI_LOAD_REGISTER_IMM(L3LOG_DW);
for (i = 0; i < L3LOG_DW; i++) {
*cs++ = i915_mmio_reg_offset(GEN7_L3LOG(slice, i));
*cs++ = remap_info[i];
}
*cs++ = MI_NOOP;
intel_ring_advance(rq, cs);
return 0;
#undef L3LOG_DW
}
static int remap_l3(struct i915_request *rq)
{
struct i915_gem_context *ctx = i915_request_gem_context(rq);
int i, err;
if (!ctx || !ctx->remap_slice)
return 0;
for (i = 0; i < MAX_L3_SLICES; i++) {
if (!(ctx->remap_slice & BIT(i)))
continue;
err = remap_l3_slice(rq, i);
if (err)
return err;
}
ctx->remap_slice = 0;
return 0;
}
static int switch_mm(struct i915_request *rq, struct i915_address_space *vm)
{
int ret;
if (!vm)
return 0;
ret = rq->engine->emit_flush(rq, EMIT_FLUSH);
if (ret)
return ret;
/*
* Not only do we need a full barrier (post-sync write) after
* invalidating the TLBs, but we need to wait a little bit
* longer. Whether this is merely delaying us, or the
* subsequent flush is a key part of serialising with the
* post-sync op, this extra pass appears vital before a
* mm switch!
*/
ret = load_pd_dir(rq, vm, PP_DIR_DCLV_2G);
if (ret)
return ret;
return rq->engine->emit_flush(rq, EMIT_INVALIDATE);
}
static int clear_residuals(struct i915_request *rq)
{
struct intel_engine_cs *engine = rq->engine;
int ret;
ret = switch_mm(rq, vm_alias(engine->kernel_context->vm));
if (ret)
return ret;
if (engine->kernel_context->state) {
ret = mi_set_context(rq,
engine->kernel_context,
MI_MM_SPACE_GTT | MI_RESTORE_INHIBIT);
if (ret)
return ret;
}
ret = engine->emit_bb_start(rq,
i915_vma_offset(engine->wa_ctx.vma), 0,
0);
if (ret)
return ret;
ret = engine->emit_flush(rq, EMIT_FLUSH);
if (ret)
return ret;
/* Always invalidate before the next switch_mm() */
return engine->emit_flush(rq, EMIT_INVALIDATE);
}
static int switch_context(struct i915_request *rq)
{
struct intel_engine_cs *engine = rq->engine;
struct intel_context *ce = rq->context;
void **residuals = NULL;
int ret;
GEM_BUG_ON(HAS_EXECLISTS(engine->i915));
if (engine->wa_ctx.vma && ce != engine->kernel_context) {
if (engine->wa_ctx.vma->private != ce &&
i915_mitigate_clear_residuals()) {
ret = clear_residuals(rq);
if (ret)
return ret;
residuals = &engine->wa_ctx.vma->private;
}
}
ret = switch_mm(rq, vm_alias(ce->vm));
if (ret)
return ret;
if (ce->state) {
u32 flags;
GEM_BUG_ON(engine->id != RCS0);
/* For resource streamer on HSW+ and power context elsewhere */
BUILD_BUG_ON(HSW_MI_RS_SAVE_STATE_EN != MI_SAVE_EXT_STATE_EN);
BUILD_BUG_ON(HSW_MI_RS_RESTORE_STATE_EN != MI_RESTORE_EXT_STATE_EN);
flags = MI_SAVE_EXT_STATE_EN | MI_MM_SPACE_GTT;
if (test_bit(CONTEXT_VALID_BIT, &ce->flags))
flags |= MI_RESTORE_EXT_STATE_EN;
else
flags |= MI_RESTORE_INHIBIT;
ret = mi_set_context(rq, ce, flags);
if (ret)
return ret;
}
ret = remap_l3(rq);
if (ret)
return ret;
/*
* Now past the point of no return, this request _will_ be emitted.
*
* Or at least this preamble will be emitted, the request may be
* interrupted prior to submitting the user payload. If so, we
* still submit the "empty" request in order to preserve global
* state tracking such as this, our tracking of the current
* dirty context.
*/
if (residuals) {
intel_context_put(*residuals);
*residuals = intel_context_get(ce);
}
return 0;
}
static int ring_request_alloc(struct i915_request *request)
{
int ret;
GEM_BUG_ON(!intel_context_is_pinned(request->context));
GEM_BUG_ON(i915_request_timeline(request)->has_initial_breadcrumb);
/*
* 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 += LEGACY_REQUEST_SIZE;
/* Unconditionally invalidate GPU caches and TLBs. */
ret = request->engine->emit_flush(request, EMIT_INVALIDATE);
if (ret)
return ret;
ret = switch_context(request);
if (ret)
return ret;
request->reserved_space -= LEGACY_REQUEST_SIZE;
return 0;
}
static void gen6_bsd_submit_request(struct i915_request *request)
{
struct intel_uncore *uncore = request->engine->uncore;
intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL);
/* Every tail move must follow the sequence below */
/* Disable notification that the ring is IDLE. The GT
* will then assume that it is busy and bring it out of rc6.
*/
intel_uncore_write_fw(uncore, RING_PSMI_CTL(GEN6_BSD_RING_BASE),
_MASKED_BIT_ENABLE(GEN6_PSMI_SLEEP_MSG_DISABLE));
/* Clear the context id. Here be magic! */
intel_uncore_write64_fw(uncore, GEN6_BSD_RNCID, 0x0);
/* Wait for the ring not to be idle, i.e. for it to wake up. */
if (__intel_wait_for_register_fw(uncore,
RING_PSMI_CTL(GEN6_BSD_RING_BASE),
GEN6_BSD_SLEEP_INDICATOR,
0,
1000, 0, NULL))
drm_err(&uncore->i915->drm,
"timed out waiting for the BSD ring to wake up\n");
/* Now that the ring is fully powered up, update the tail */
i9xx_submit_request(request);
/* Let the ring send IDLE messages to the GT again,
* and so let it sleep to conserve power when idle.
*/
intel_uncore_write_fw(uncore, RING_PSMI_CTL(GEN6_BSD_RING_BASE),
_MASKED_BIT_DISABLE(GEN6_PSMI_SLEEP_MSG_DISABLE));
intel_uncore_forcewake_put(uncore, FORCEWAKE_ALL);
}
static void i9xx_set_default_submission(struct intel_engine_cs *engine)
{
engine->submit_request = i9xx_submit_request;
}
static void gen6_bsd_set_default_submission(struct intel_engine_cs *engine)
{
engine->submit_request = gen6_bsd_submit_request;
}
static void ring_release(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
drm_WARN_ON(&dev_priv->drm, GRAPHICS_VER(dev_priv) > 2 &&
(ENGINE_READ(engine, RING_MI_MODE) & MODE_IDLE) == 0);
intel_engine_cleanup_common(engine);
if (engine->wa_ctx.vma) {
intel_context_put(engine->wa_ctx.vma->private);
i915_vma_unpin_and_release(&engine->wa_ctx.vma, 0);
}
intel_ring_unpin(engine->legacy.ring);
intel_ring_put(engine->legacy.ring);
intel_timeline_unpin(engine->legacy.timeline);
intel_timeline_put(engine->legacy.timeline);
}
static void irq_handler(struct intel_engine_cs *engine, u16 iir)
{
intel_engine_signal_breadcrumbs(engine);
}
static void setup_irq(struct intel_engine_cs *engine)
{
struct drm_i915_private *i915 = engine->i915;
intel_engine_set_irq_handler(engine, irq_handler);
if (GRAPHICS_VER(i915) >= 6) {
engine->irq_enable = gen6_irq_enable;
engine->irq_disable = gen6_irq_disable;
} else if (GRAPHICS_VER(i915) >= 5) {
engine->irq_enable = gen5_irq_enable;
engine->irq_disable = gen5_irq_disable;
} else if (GRAPHICS_VER(i915) >= 3) {
engine->irq_enable = gen3_irq_enable;
engine->irq_disable = gen3_irq_disable;
} else {
engine->irq_enable = gen2_irq_enable;
engine->irq_disable = gen2_irq_disable;
}
}
static void add_to_engine(struct i915_request *rq)
{
lockdep_assert_held(&rq->engine->sched_engine->lock);
list_move_tail(&rq->sched.link, &rq->engine->sched_engine->requests);
}
static void remove_from_engine(struct i915_request *rq)
{
spin_lock_irq(&rq->engine->sched_engine->lock);
list_del_init(&rq->sched.link);
/* Prevent further __await_execution() registering a cb, then flush */
set_bit(I915_FENCE_FLAG_ACTIVE, &rq->fence.flags);
spin_unlock_irq(&rq->engine->sched_engine->lock);
i915_request_notify_execute_cb_imm(rq);
}
static void setup_common(struct intel_engine_cs *engine)
{
struct drm_i915_private *i915 = engine->i915;
/* gen8+ are only supported with execlists */
GEM_BUG_ON(GRAPHICS_VER(i915) >= 8);
setup_irq(engine);
engine->resume = xcs_resume;
engine->sanitize = xcs_sanitize;
engine->reset.prepare = reset_prepare;
engine->reset.rewind = reset_rewind;
engine->reset.cancel = reset_cancel;
engine->reset.finish = reset_finish;
engine->add_active_request = add_to_engine;
engine->remove_active_request = remove_from_engine;
engine->cops = &ring_context_ops;
engine->request_alloc = ring_request_alloc;
/*
* Using a global execution timeline; the previous final breadcrumb is
* equivalent to our next initial bread so we can elide
* engine->emit_init_breadcrumb().
*/
engine->emit_fini_breadcrumb = gen3_emit_breadcrumb;
if (GRAPHICS_VER(i915) == 5)
engine->emit_fini_breadcrumb = gen5_emit_breadcrumb;
engine->set_default_submission = i9xx_set_default_submission;
if (GRAPHICS_VER(i915) >= 6)
engine->emit_bb_start = gen6_emit_bb_start;
else if (GRAPHICS_VER(i915) >= 4)
engine->emit_bb_start = gen4_emit_bb_start;
else if (IS_I830(i915) || IS_I845G(i915))
engine->emit_bb_start = i830_emit_bb_start;
else
engine->emit_bb_start = gen3_emit_bb_start;
}
static void setup_rcs(struct intel_engine_cs *engine)
{
struct drm_i915_private *i915 = engine->i915;
if (HAS_L3_DPF(i915))
engine->irq_keep_mask = GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
engine->irq_enable_mask = GT_RENDER_USER_INTERRUPT;
if (GRAPHICS_VER(i915) >= 7) {
engine->emit_flush = gen7_emit_flush_rcs;
engine->emit_fini_breadcrumb = gen7_emit_breadcrumb_rcs;
} else if (GRAPHICS_VER(i915) == 6) {
engine->emit_flush = gen6_emit_flush_rcs;
engine->emit_fini_breadcrumb = gen6_emit_breadcrumb_rcs;
} else if (GRAPHICS_VER(i915) == 5) {
engine->emit_flush = gen4_emit_flush_rcs;
} else {
if (GRAPHICS_VER(i915) < 4)
engine->emit_flush = gen2_emit_flush;
else
engine->emit_flush = gen4_emit_flush_rcs;
engine->irq_enable_mask = I915_USER_INTERRUPT;
}
if (IS_HASWELL(i915))
engine->emit_bb_start = hsw_emit_bb_start;
}
static void setup_vcs(struct intel_engine_cs *engine)
{
struct drm_i915_private *i915 = engine->i915;
if (GRAPHICS_VER(i915) >= 6) {
/* gen6 bsd needs a special wa for tail updates */
if (GRAPHICS_VER(i915) == 6)
engine->set_default_submission = gen6_bsd_set_default_submission;
engine->emit_flush = gen6_emit_flush_vcs;
engine->irq_enable_mask = GT_BSD_USER_INTERRUPT;
if (GRAPHICS_VER(i915) == 6)
engine->emit_fini_breadcrumb = gen6_emit_breadcrumb_xcs;
else
engine->emit_fini_breadcrumb = gen7_emit_breadcrumb_xcs;
} else {
engine->emit_flush = gen4_emit_flush_vcs;
if (GRAPHICS_VER(i915) == 5)
engine->irq_enable_mask = ILK_BSD_USER_INTERRUPT;
else
engine->irq_enable_mask = I915_BSD_USER_INTERRUPT;
}
}
static void setup_bcs(struct intel_engine_cs *engine)
{
struct drm_i915_private *i915 = engine->i915;
engine->emit_flush = gen6_emit_flush_xcs;
engine->irq_enable_mask = GT_BLT_USER_INTERRUPT;
if (GRAPHICS_VER(i915) == 6)
engine->emit_fini_breadcrumb = gen6_emit_breadcrumb_xcs;
else
engine->emit_fini_breadcrumb = gen7_emit_breadcrumb_xcs;
}
static void setup_vecs(struct intel_engine_cs *engine)
{
struct drm_i915_private *i915 = engine->i915;
GEM_BUG_ON(GRAPHICS_VER(i915) < 7);
engine->emit_flush = gen6_emit_flush_xcs;
engine->irq_enable_mask = PM_VEBOX_USER_INTERRUPT;
engine->irq_enable = hsw_irq_enable_vecs;
engine->irq_disable = hsw_irq_disable_vecs;
engine->emit_fini_breadcrumb = gen7_emit_breadcrumb_xcs;
}
static int gen7_ctx_switch_bb_setup(struct intel_engine_cs * const engine,
struct i915_vma * const vma)
{
return gen7_setup_clear_gpr_bb(engine, vma);
}
static int gen7_ctx_switch_bb_init(struct intel_engine_cs *engine,
struct i915_gem_ww_ctx *ww,
struct i915_vma *vma)
{
int err;
err = i915_vma_pin_ww(vma, ww, 0, 0, PIN_USER | PIN_HIGH);
if (err)
return err;
err = i915_vma_sync(vma);
if (err)
goto err_unpin;
err = gen7_ctx_switch_bb_setup(engine, vma);
if (err)
goto err_unpin;
engine->wa_ctx.vma = vma;
return 0;
err_unpin:
i915_vma_unpin(vma);
return err;
}
static struct i915_vma *gen7_ctx_vma(struct intel_engine_cs *engine)
{
struct drm_i915_gem_object *obj;
struct i915_vma *vma;
int size, err;
if (GRAPHICS_VER(engine->i915) != 7 || engine->class != RENDER_CLASS)
return NULL;
err = gen7_ctx_switch_bb_setup(engine, NULL /* probe size */);
if (err < 0)
return ERR_PTR(err);
if (!err)
return NULL;
size = ALIGN(err, PAGE_SIZE);
obj = i915_gem_object_create_internal(engine->i915, size);
if (IS_ERR(obj))
return ERR_CAST(obj);
vma = i915_vma_instance(obj, engine->gt->vm, NULL);
if (IS_ERR(vma)) {
i915_gem_object_put(obj);
return ERR_CAST(vma);
}
vma->private = intel_context_create(engine); /* dummy residuals */
if (IS_ERR(vma->private)) {
err = PTR_ERR(vma->private);
vma->private = NULL;
i915_gem_object_put(obj);
return ERR_PTR(err);
}
return vma;
}
int intel_ring_submission_setup(struct intel_engine_cs *engine)
{
struct i915_gem_ww_ctx ww;
struct intel_timeline *timeline;
struct intel_ring *ring;
struct i915_vma *gen7_wa_vma;
int err;
setup_common(engine);
switch (engine->class) {
case RENDER_CLASS:
setup_rcs(engine);
break;
case VIDEO_DECODE_CLASS:
setup_vcs(engine);
break;
case COPY_ENGINE_CLASS:
setup_bcs(engine);
break;
case VIDEO_ENHANCEMENT_CLASS:
setup_vecs(engine);
break;
default:
MISSING_CASE(engine->class);
return -ENODEV;
}
timeline = intel_timeline_create_from_engine(engine,
I915_GEM_HWS_SEQNO_ADDR);
if (IS_ERR(timeline)) {
err = PTR_ERR(timeline);
goto err;
}
GEM_BUG_ON(timeline->has_initial_breadcrumb);
ring = intel_engine_create_ring(engine, SZ_16K);
if (IS_ERR(ring)) {
err = PTR_ERR(ring);
goto err_timeline;
}
GEM_BUG_ON(engine->legacy.ring);
engine->legacy.ring = ring;
engine->legacy.timeline = timeline;
gen7_wa_vma = gen7_ctx_vma(engine);
if (IS_ERR(gen7_wa_vma)) {
err = PTR_ERR(gen7_wa_vma);
goto err_ring;
}
i915_gem_ww_ctx_init(&ww, false);
retry:
err = i915_gem_object_lock(timeline->hwsp_ggtt->obj, &ww);
if (!err && gen7_wa_vma)
err = i915_gem_object_lock(gen7_wa_vma->obj, &ww);
if (!err)
err = i915_gem_object_lock(engine->legacy.ring->vma->obj, &ww);
if (!err)
err = intel_timeline_pin(timeline, &ww);
if (!err) {
err = intel_ring_pin(ring, &ww);
if (err)
intel_timeline_unpin(timeline);
}
if (err)
goto out;
GEM_BUG_ON(timeline->hwsp_ggtt != engine->status_page.vma);
if (gen7_wa_vma) {
err = gen7_ctx_switch_bb_init(engine, &ww, gen7_wa_vma);
if (err) {
intel_ring_unpin(ring);
intel_timeline_unpin(timeline);
}
}
out:
if (err == -EDEADLK) {
err = i915_gem_ww_ctx_backoff(&ww);
if (!err)
goto retry;
}
i915_gem_ww_ctx_fini(&ww);
if (err)
goto err_gen7_put;
/* Finally, take ownership and responsibility for cleanup! */
engine->release = ring_release;
return 0;
err_gen7_put:
if (gen7_wa_vma) {
intel_context_put(gen7_wa_vma->private);
i915_gem_object_put(gen7_wa_vma->obj);
}
err_ring:
intel_ring_put(ring);
err_timeline:
intel_timeline_put(timeline);
err:
intel_engine_cleanup_common(engine);
return err;
}
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftest_ring_submission.c"
#endif
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