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alistair23-linux/drivers/gpu/drm/i915/intel_ringbuffer.c
Chris Wilson fd13821219 drm/i915: Make request's wait-for-space explicit 
At the start of building a request, we would wait for roughly enough
space to fit the average request (to reduce the likelihood of having to
wait and abort partway through request construction). To achieve we
would try to begin a 0-length command packet, this just adds extra
confusion so make the wait-for-space explicit, as in the next patch we
want to move it from the backend to the i915_gem_request_alloc() so it
can ensure that the wait-for-space is the first operation in building a
new request.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171115151204.8105-2-chris@chris-wilson.co.uk
2017-11-15 17:12:49 +00:00

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/*
* Copyright © 2008-2010 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:
* Eric Anholt <eric@anholt.net>
* Zou Nan hai <nanhai.zou@intel.com>
* Xiang Hai hao<haihao.xiang@intel.com>
*
*/
#include <linux/log2.h>
#include <drm/drmP.h>
#include <drm/i915_drm.h>
#include "i915_drv.h"
#include "i915_gem_render_state.h"
#include "i915_trace.h"
#include "intel_drv.h"
/* Rough estimate of the typical request size, performing a flush,
* set-context and then emitting the batch.
*/
#define LEGACY_REQUEST_SIZE 200
static unsigned int __intel_ring_space(unsigned int head,
unsigned int tail,
unsigned int size)
{
/*
* "If the Ring Buffer Head Pointer and the Tail Pointer are on the
* same cacheline, the Head Pointer must not be greater than the Tail
* Pointer."
*/
GEM_BUG_ON(!is_power_of_2(size));
return (head - tail - CACHELINE_BYTES) & (size - 1);
}
unsigned int intel_ring_update_space(struct intel_ring *ring)
{
unsigned int space;
space = __intel_ring_space(ring->head, ring->emit, ring->size);
ring->space = space;
return space;
}
static int
gen2_render_ring_flush(struct drm_i915_gem_request *req, u32 mode)
{
u32 cmd, *cs;
cmd = MI_FLUSH;
if (mode & EMIT_INVALIDATE)
cmd |= MI_READ_FLUSH;
cs = intel_ring_begin(req, 2);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = cmd;
*cs++ = MI_NOOP;
intel_ring_advance(req, cs);
return 0;
}
static int
gen4_render_ring_flush(struct drm_i915_gem_request *req, u32 mode)
{
u32 cmd, *cs;
/*
* read/write caches:
*
* I915_GEM_DOMAIN_RENDER is always invalidated, but is
* only flushed if MI_NO_WRITE_FLUSH is unset. On 965, it is
* also flushed at 2d versus 3d pipeline switches.
*
* read-only caches:
*
* I915_GEM_DOMAIN_SAMPLER is flushed on pre-965 if
* MI_READ_FLUSH is set, and is always flushed on 965.
*
* I915_GEM_DOMAIN_COMMAND may not exist?
*
* I915_GEM_DOMAIN_INSTRUCTION, which exists on 965, is
* invalidated when MI_EXE_FLUSH is set.
*
* I915_GEM_DOMAIN_VERTEX, which exists on 965, is
* invalidated with every MI_FLUSH.
*
* TLBs:
*
* On 965, TLBs associated with I915_GEM_DOMAIN_COMMAND
* and I915_GEM_DOMAIN_CPU in are invalidated at PTE write and
* I915_GEM_DOMAIN_RENDER and I915_GEM_DOMAIN_SAMPLER
* are flushed at any MI_FLUSH.
*/
cmd = MI_FLUSH;
if (mode & EMIT_INVALIDATE) {
cmd |= MI_EXE_FLUSH;
if (IS_G4X(req->i915) || IS_GEN5(req->i915))
cmd |= MI_INVALIDATE_ISP;
}
cs = intel_ring_begin(req, 2);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = cmd;
*cs++ = MI_NOOP;
intel_ring_advance(req, cs);
return 0;
}
/**
* Emits a PIPE_CONTROL with a non-zero post-sync operation, for
* implementing two workarounds on gen6. From section 1.4.7.1
* "PIPE_CONTROL" of the Sandy Bridge PRM volume 2 part 1:
*
* [DevSNB-C+{W/A}] Before any depth stall flush (including those
* produced by non-pipelined state commands), software needs to first
* send a PIPE_CONTROL with no bits set except Post-Sync Operation !=
* 0.
*
* [Dev-SNB{W/A}]: Before a PIPE_CONTROL with Write Cache Flush Enable
* =1, a PIPE_CONTROL with any non-zero post-sync-op is required.
*
* And the workaround for these two requires this workaround first:
*
* [Dev-SNB{W/A}]: Pipe-control with CS-stall bit set must be sent
* BEFORE the pipe-control with a post-sync op and no write-cache
* flushes.
*
* And this last workaround is tricky because of the requirements on
* that bit. From section 1.4.7.2.3 "Stall" of the Sandy Bridge PRM
* volume 2 part 1:
*
* "1 of the following must also be set:
* - Render Target Cache Flush Enable ([12] of DW1)
* - Depth Cache Flush Enable ([0] of DW1)
* - Stall at Pixel Scoreboard ([1] of DW1)
* - Depth Stall ([13] of DW1)
* - Post-Sync Operation ([13] of DW1)
* - Notify Enable ([8] of DW1)"
*
* The cache flushes require the workaround flush that triggered this
* one, so we can't use it. Depth stall would trigger the same.
* Post-sync nonzero is what triggered this second workaround, so we
* can't use that one either. Notify enable is IRQs, which aren't
* really our business. That leaves only stall at scoreboard.
*/
static int
intel_emit_post_sync_nonzero_flush(struct drm_i915_gem_request *req)
{
u32 scratch_addr =
i915_ggtt_offset(req->engine->scratch) + 2 * CACHELINE_BYTES;
u32 *cs;
cs = intel_ring_begin(req, 6);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = GFX_OP_PIPE_CONTROL(5);
*cs++ = PIPE_CONTROL_CS_STALL | PIPE_CONTROL_STALL_AT_SCOREBOARD;
*cs++ = scratch_addr | PIPE_CONTROL_GLOBAL_GTT;
*cs++ = 0; /* low dword */
*cs++ = 0; /* high dword */
*cs++ = MI_NOOP;
intel_ring_advance(req, cs);
cs = intel_ring_begin(req, 6);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = GFX_OP_PIPE_CONTROL(5);
*cs++ = PIPE_CONTROL_QW_WRITE;
*cs++ = scratch_addr | PIPE_CONTROL_GLOBAL_GTT;
*cs++ = 0;
*cs++ = 0;
*cs++ = MI_NOOP;
intel_ring_advance(req, cs);
return 0;
}
static int
gen6_render_ring_flush(struct drm_i915_gem_request *req, u32 mode)
{
u32 scratch_addr =
i915_ggtt_offset(req->engine->scratch) + 2 * CACHELINE_BYTES;
u32 *cs, flags = 0;
int ret;
/* Force SNB workarounds for PIPE_CONTROL flushes */
ret = intel_emit_post_sync_nonzero_flush(req);
if (ret)
return ret;
/* Just flush everything. Experiments have shown that reducing the
* number of bits based on the write domains has little performance
* impact.
*/
if (mode & EMIT_FLUSH) {
flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
/*
* Ensure that any following seqno writes only happen
* when the render cache is indeed flushed.
*/
flags |= PIPE_CONTROL_CS_STALL;
}
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;
/*
* TLB invalidate requires a post-sync write.
*/
flags |= PIPE_CONTROL_QW_WRITE | PIPE_CONTROL_CS_STALL;
}
cs = intel_ring_begin(req, 4);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = GFX_OP_PIPE_CONTROL(4);
*cs++ = flags;
*cs++ = scratch_addr | PIPE_CONTROL_GLOBAL_GTT;
*cs++ = 0;
intel_ring_advance(req, cs);
return 0;
}
static int
gen7_render_ring_cs_stall_wa(struct drm_i915_gem_request *req)
{
u32 *cs;
cs = intel_ring_begin(req, 4);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = GFX_OP_PIPE_CONTROL(4);
*cs++ = PIPE_CONTROL_CS_STALL | PIPE_CONTROL_STALL_AT_SCOREBOARD;
*cs++ = 0;
*cs++ = 0;
intel_ring_advance(req, cs);
return 0;
}
static int
gen7_render_ring_flush(struct drm_i915_gem_request *req, u32 mode)
{
u32 scratch_addr =
i915_ggtt_offset(req->engine->scratch) + 2 * CACHELINE_BYTES;
u32 *cs, flags = 0;
/*
* Ensure that any following seqno writes only happen when the render
* cache is indeed flushed.
*
* Workaround: 4th PIPE_CONTROL command (except the ones with only
* read-cache invalidate bits set) must have the CS_STALL bit set. We
* don't try to be clever and just set it unconditionally.
*/
flags |= PIPE_CONTROL_CS_STALL;
/* Just flush everything. Experiments have shown that reducing the
* number of bits based on the write domains has little performance
* impact.
*/
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_MEDIA_STATE_CLEAR;
/*
* TLB invalidate requires a post-sync write.
*/
flags |= PIPE_CONTROL_QW_WRITE;
flags |= PIPE_CONTROL_GLOBAL_GTT_IVB;
flags |= PIPE_CONTROL_STALL_AT_SCOREBOARD;
/* Workaround: we must issue a pipe_control with CS-stall bit
* set before a pipe_control command that has the state cache
* invalidate bit set. */
gen7_render_ring_cs_stall_wa(req);
}
cs = intel_ring_begin(req, 4);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = GFX_OP_PIPE_CONTROL(4);
*cs++ = flags;
*cs++ = scratch_addr;
*cs++ = 0;
intel_ring_advance(req, cs);
return 0;
}
static int
gen8_render_ring_flush(struct drm_i915_gem_request *req, u32 mode)
{
u32 flags;
u32 *cs;
cs = intel_ring_begin(req, mode & EMIT_INVALIDATE ? 12 : 6);
if (IS_ERR(cs))
return PTR_ERR(cs);
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;
/* WaCsStallBeforeStateCacheInvalidate:bdw,chv */
cs = gen8_emit_pipe_control(cs,
PIPE_CONTROL_CS_STALL |
PIPE_CONTROL_STALL_AT_SCOREBOARD,
0);
}
cs = gen8_emit_pipe_control(cs, flags,
i915_ggtt_offset(req->engine->scratch) +
2 * CACHELINE_BYTES);
intel_ring_advance(req, cs);
return 0;
}
static void ring_setup_phys_status_page(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
u32 addr;
addr = dev_priv->status_page_dmah->busaddr;
if (INTEL_GEN(dev_priv) >= 4)
addr |= (dev_priv->status_page_dmah->busaddr >> 28) & 0xf0;
I915_WRITE(HWS_PGA, addr);
}
static void intel_ring_setup_status_page(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
i915_reg_t mmio;
/* The ring status page addresses are no longer next to the rest of
* the ring registers as of gen7.
*/
if (IS_GEN7(dev_priv)) {
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);
case RCS:
mmio = RENDER_HWS_PGA_GEN7;
break;
case BCS:
mmio = BLT_HWS_PGA_GEN7;
break;
case VCS:
mmio = BSD_HWS_PGA_GEN7;
break;
case VECS:
mmio = VEBOX_HWS_PGA_GEN7;
break;
}
} else if (IS_GEN6(dev_priv)) {
mmio = RING_HWS_PGA_GEN6(engine->mmio_base);
} else {
/* XXX: gen8 returns to sanity */
mmio = RING_HWS_PGA(engine->mmio_base);
}
if (INTEL_GEN(dev_priv) >= 6)
I915_WRITE(RING_HWSTAM(engine->mmio_base), 0xffffffff);
I915_WRITE(mmio, engine->status_page.ggtt_offset);
POSTING_READ(mmio);
/*
* Flush the TLB for this page
*
* FIXME: These two bits have disappeared on gen8, so a question
* arises: do we still need this and if so how should we go about
* invalidating the TLB?
*/
if (IS_GEN(dev_priv, 6, 7)) {
i915_reg_t reg = RING_INSTPM(engine->mmio_base);
/* ring should be idle before issuing a sync flush*/
WARN_ON((I915_READ_MODE(engine) & MODE_IDLE) == 0);
I915_WRITE(reg,
_MASKED_BIT_ENABLE(INSTPM_TLB_INVALIDATE |
INSTPM_SYNC_FLUSH));
if (intel_wait_for_register(dev_priv,
reg, INSTPM_SYNC_FLUSH, 0,
1000))
DRM_ERROR("%s: wait for SyncFlush to complete for TLB invalidation timed out\n",
engine->name);
}
}
static bool stop_ring(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
if (INTEL_GEN(dev_priv) > 2) {
I915_WRITE_MODE(engine, _MASKED_BIT_ENABLE(STOP_RING));
if (intel_wait_for_register(dev_priv,
RING_MI_MODE(engine->mmio_base),
MODE_IDLE,
MODE_IDLE,
1000)) {
DRM_ERROR("%s : timed out trying to stop ring\n",
engine->name);
/* Sometimes we observe that the idle flag is not
* set even though the ring is empty. So double
* check before giving up.
*/
if (I915_READ_HEAD(engine) != I915_READ_TAIL(engine))
return false;
}
}
I915_WRITE_HEAD(engine, I915_READ_TAIL(engine));
I915_WRITE_HEAD(engine, 0);
I915_WRITE_TAIL(engine, 0);
/* The ring must be empty before it is disabled */
I915_WRITE_CTL(engine, 0);
return (I915_READ_HEAD(engine) & HEAD_ADDR) == 0;
}
static int init_ring_common(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
struct intel_ring *ring = engine->buffer;
int ret = 0;
intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
if (!stop_ring(engine)) {
/* G45 ring initialization often fails to reset head to zero */
DRM_DEBUG_KMS("%s head not reset to zero "
"ctl %08x head %08x tail %08x start %08x\n",
engine->name,
I915_READ_CTL(engine),
I915_READ_HEAD(engine),
I915_READ_TAIL(engine),
I915_READ_START(engine));
if (!stop_ring(engine)) {
DRM_ERROR("failed to set %s head to zero "
"ctl %08x head %08x tail %08x start %08x\n",
engine->name,
I915_READ_CTL(engine),
I915_READ_HEAD(engine),
I915_READ_TAIL(engine),
I915_READ_START(engine));
ret = -EIO;
goto out;
}
}
if (HWS_NEEDS_PHYSICAL(dev_priv))
ring_setup_phys_status_page(engine);
else
intel_ring_setup_status_page(engine);
intel_engine_reset_breadcrumbs(engine);
/* Enforce ordering by reading HEAD register back */
I915_READ_HEAD(engine);
/* 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. */
I915_WRITE_START(engine, i915_ggtt_offset(ring->vma));
/* WaClearRingBufHeadRegAtInit:ctg,elk */
if (I915_READ_HEAD(engine))
DRM_DEBUG("%s initialization failed [head=%08x], fudging\n",
engine->name, I915_READ_HEAD(engine));
intel_ring_update_space(ring);
I915_WRITE_HEAD(engine, ring->head);
I915_WRITE_TAIL(engine, ring->tail);
(void)I915_READ_TAIL(engine);
I915_WRITE_CTL(engine, RING_CTL_SIZE(ring->size) | RING_VALID);
/* If the head is still not zero, the ring is dead */
if (intel_wait_for_register(dev_priv, RING_CTL(engine->mmio_base),
RING_VALID, RING_VALID,
50)) {
DRM_ERROR("%s initialization failed "
"ctl %08x (valid? %d) head %08x [%08x] tail %08x [%08x] start %08x [expected %08x]\n",
engine->name,
I915_READ_CTL(engine),
I915_READ_CTL(engine) & RING_VALID,
I915_READ_HEAD(engine), ring->head,
I915_READ_TAIL(engine), ring->tail,
I915_READ_START(engine),
i915_ggtt_offset(ring->vma));
ret = -EIO;
goto out;
}
intel_engine_init_hangcheck(engine);
if (INTEL_GEN(dev_priv) > 2)
I915_WRITE_MODE(engine, _MASKED_BIT_DISABLE(STOP_RING));
out:
intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
return ret;
}
static void reset_ring_common(struct intel_engine_cs *engine,
struct drm_i915_gem_request *request)
{
/*
* RC6 must be prevented until the reset is complete and the engine
* reinitialised. If it occurs in the middle of this sequence, the
* state written to/loaded from the power context is ill-defined (e.g.
* the PP_BASE_DIR may be lost).
*/
assert_forcewakes_active(engine->i915, FORCEWAKE_ALL);
/*
* 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.
*/
if (request) {
struct drm_i915_private *dev_priv = request->i915;
struct intel_context *ce = &request->ctx->engine[engine->id];
struct i915_hw_ppgtt *ppgtt;
/* FIXME consider gen8 reset */
if (ce->state) {
I915_WRITE(CCID,
i915_ggtt_offset(ce->state) |
BIT(8) /* must be set! */ |
CCID_EXTENDED_STATE_SAVE |
CCID_EXTENDED_STATE_RESTORE |
CCID_EN);
}
ppgtt = request->ctx->ppgtt ?: engine->i915->mm.aliasing_ppgtt;
if (ppgtt) {
u32 pd_offset = ppgtt->pd.base.ggtt_offset << 10;
I915_WRITE(RING_PP_DIR_DCLV(engine), PP_DIR_DCLV_2G);
I915_WRITE(RING_PP_DIR_BASE(engine), pd_offset);
/* Wait for the PD reload to complete */
if (intel_wait_for_register(dev_priv,
RING_PP_DIR_BASE(engine),
BIT(0), 0,
10))
DRM_ERROR("Wait for reload of ppgtt page-directory timed out\n");
ppgtt->pd_dirty_rings &= ~intel_engine_flag(engine);
}
/* If the rq hung, jump to its breadcrumb and skip the batch */
if (request->fence.error == -EIO)
request->ring->head = request->postfix;
} else {
engine->legacy_active_context = NULL;
}
}
static int intel_rcs_ctx_init(struct drm_i915_gem_request *req)
{
int ret;
ret = intel_ring_workarounds_emit(req);
if (ret != 0)
return ret;
ret = i915_gem_render_state_emit(req);
if (ret)
return ret;
return 0;
}
static int init_render_ring(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
int ret = init_ring_common(engine);
if (ret)
return ret;
/* WaTimedSingleVertexDispatch:cl,bw,ctg,elk,ilk,snb */
if (IS_GEN(dev_priv, 4, 6))
I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(VS_TIMER_DISPATCH));
/* 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
*/
if (IS_GEN(dev_priv, 6, 7))
I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE));
/* Required for the hardware to program scanline values for waiting */
/* WaEnableFlushTlbInvalidationMode:snb */
if (IS_GEN6(dev_priv))
I915_WRITE(GFX_MODE,
_MASKED_BIT_ENABLE(GFX_TLB_INVALIDATE_EXPLICIT));
/* WaBCSVCSTlbInvalidationMode:ivb,vlv,hsw */
if (IS_GEN7(dev_priv))
I915_WRITE(GFX_MODE_GEN7,
_MASKED_BIT_ENABLE(GFX_TLB_INVALIDATE_EXPLICIT) |
_MASKED_BIT_ENABLE(GFX_REPLAY_MODE));
if (IS_GEN6(dev_priv)) {
/* From the Sandybridge PRM, volume 1 part 3, page 24:
* "If this bit is set, STCunit will have LRA as replacement
* policy. [...] This bit must be reset. LRA replacement
* policy is not supported."
*/
I915_WRITE(CACHE_MODE_0,
_MASKED_BIT_DISABLE(CM0_STC_EVICT_DISABLE_LRA_SNB));
}
if (IS_GEN(dev_priv, 6, 7))
I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_FORCE_ORDERING));
if (INTEL_INFO(dev_priv)->gen >= 6)
I915_WRITE_IMR(engine, ~engine->irq_keep_mask);
return init_workarounds_ring(engine);
}
static void render_ring_cleanup(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
i915_vma_unpin_and_release(&dev_priv->semaphore);
}
static u32 *gen8_rcs_signal(struct drm_i915_gem_request *req, u32 *cs)
{
struct drm_i915_private *dev_priv = req->i915;
struct intel_engine_cs *waiter;
enum intel_engine_id id;
for_each_engine(waiter, dev_priv, id) {
u64 gtt_offset = req->engine->semaphore.signal_ggtt[id];
if (gtt_offset == MI_SEMAPHORE_SYNC_INVALID)
continue;
*cs++ = GFX_OP_PIPE_CONTROL(6);
*cs++ = PIPE_CONTROL_GLOBAL_GTT_IVB | PIPE_CONTROL_QW_WRITE |
PIPE_CONTROL_CS_STALL;
*cs++ = lower_32_bits(gtt_offset);
*cs++ = upper_32_bits(gtt_offset);
*cs++ = req->global_seqno;
*cs++ = 0;
*cs++ = MI_SEMAPHORE_SIGNAL |
MI_SEMAPHORE_TARGET(waiter->hw_id);
*cs++ = 0;
}
return cs;
}
static u32 *gen8_xcs_signal(struct drm_i915_gem_request *req, u32 *cs)
{
struct drm_i915_private *dev_priv = req->i915;
struct intel_engine_cs *waiter;
enum intel_engine_id id;
for_each_engine(waiter, dev_priv, id) {
u64 gtt_offset = req->engine->semaphore.signal_ggtt[id];
if (gtt_offset == MI_SEMAPHORE_SYNC_INVALID)
continue;
*cs++ = (MI_FLUSH_DW + 1) | MI_FLUSH_DW_OP_STOREDW;
*cs++ = lower_32_bits(gtt_offset) | MI_FLUSH_DW_USE_GTT;
*cs++ = upper_32_bits(gtt_offset);
*cs++ = req->global_seqno;
*cs++ = MI_SEMAPHORE_SIGNAL |
MI_SEMAPHORE_TARGET(waiter->hw_id);
*cs++ = 0;
}
return cs;
}
static u32 *gen6_signal(struct drm_i915_gem_request *req, u32 *cs)
{
struct drm_i915_private *dev_priv = req->i915;
struct intel_engine_cs *engine;
enum intel_engine_id id;
int num_rings = 0;
for_each_engine(engine, dev_priv, id) {
i915_reg_t mbox_reg;
if (!(BIT(engine->hw_id) & GEN6_SEMAPHORES_MASK))
continue;
mbox_reg = req->engine->semaphore.mbox.signal[engine->hw_id];
if (i915_mmio_reg_valid(mbox_reg)) {
*cs++ = MI_LOAD_REGISTER_IMM(1);
*cs++ = i915_mmio_reg_offset(mbox_reg);
*cs++ = req->global_seqno;
num_rings++;
}
}
if (num_rings & 1)
*cs++ = MI_NOOP;
return cs;
}
static void cancel_requests(struct intel_engine_cs *engine)
{
struct drm_i915_gem_request *request;
unsigned long flags;
spin_lock_irqsave(&engine->timeline->lock, flags);
/* Mark all submitted requests as skipped. */
list_for_each_entry(request, &engine->timeline->requests, link) {
GEM_BUG_ON(!request->global_seqno);
if (!i915_gem_request_completed(request))
dma_fence_set_error(&request->fence, -EIO);
}
/* Remaining _unready_ requests will be nop'ed when submitted */
spin_unlock_irqrestore(&engine->timeline->lock, flags);
}
static void i9xx_submit_request(struct drm_i915_gem_request *request)
{
struct drm_i915_private *dev_priv = request->i915;
i915_gem_request_submit(request);
I915_WRITE_TAIL(request->engine,
intel_ring_set_tail(request->ring, request->tail));
}
static void i9xx_emit_breadcrumb(struct drm_i915_gem_request *req, u32 *cs)
{
*cs++ = MI_STORE_DWORD_INDEX;
*cs++ = I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT;
*cs++ = req->global_seqno;
*cs++ = MI_USER_INTERRUPT;
req->tail = intel_ring_offset(req, cs);
assert_ring_tail_valid(req->ring, req->tail);
}
static const int i9xx_emit_breadcrumb_sz = 4;
/**
* gen6_sema_emit_breadcrumb - Update the semaphore mailbox registers
*
* @request - request to write to the ring
*
* Update the mailbox registers in the *other* rings with the current seqno.
* This acts like a signal in the canonical semaphore.
*/
static void gen6_sema_emit_breadcrumb(struct drm_i915_gem_request *req, u32 *cs)
{
return i9xx_emit_breadcrumb(req,
req->engine->semaphore.signal(req, cs));
}
static void gen8_render_emit_breadcrumb(struct drm_i915_gem_request *req,
u32 *cs)
{
struct intel_engine_cs *engine = req->engine;
if (engine->semaphore.signal)
cs = engine->semaphore.signal(req, cs);
*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(engine);
*cs++ = 0;
*cs++ = req->global_seqno;
/* We're thrashing one dword of HWS. */
*cs++ = 0;
*cs++ = MI_USER_INTERRUPT;
*cs++ = MI_NOOP;
req->tail = intel_ring_offset(req, cs);
assert_ring_tail_valid(req->ring, req->tail);
}
static const int gen8_render_emit_breadcrumb_sz = 8;
/**
* intel_ring_sync - sync the waiter to the signaller on seqno
*
* @waiter - ring that is waiting
* @signaller - ring which has, or will signal
* @seqno - seqno which the waiter will block on
*/
static int
gen8_ring_sync_to(struct drm_i915_gem_request *req,
struct drm_i915_gem_request *signal)
{
struct drm_i915_private *dev_priv = req->i915;
u64 offset = GEN8_WAIT_OFFSET(req->engine, signal->engine->id);
struct i915_hw_ppgtt *ppgtt;
u32 *cs;
cs = intel_ring_begin(req, 4);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = MI_SEMAPHORE_WAIT | MI_SEMAPHORE_GLOBAL_GTT |
MI_SEMAPHORE_SAD_GTE_SDD;
*cs++ = signal->global_seqno;
*cs++ = lower_32_bits(offset);
*cs++ = upper_32_bits(offset);
intel_ring_advance(req, cs);
/* When the !RCS engines idle waiting upon a semaphore, they lose their
* pagetables and we must reload them before executing the batch.
* We do this on the i915_switch_context() following the wait and
* before the dispatch.
*/
ppgtt = req->ctx->ppgtt;
if (ppgtt && req->engine->id != RCS)
ppgtt->pd_dirty_rings |= intel_engine_flag(req->engine);
return 0;
}
static int
gen6_ring_sync_to(struct drm_i915_gem_request *req,
struct drm_i915_gem_request *signal)
{
u32 dw1 = MI_SEMAPHORE_MBOX |
MI_SEMAPHORE_COMPARE |
MI_SEMAPHORE_REGISTER;
u32 wait_mbox = signal->engine->semaphore.mbox.wait[req->engine->hw_id];
u32 *cs;
WARN_ON(wait_mbox == MI_SEMAPHORE_SYNC_INVALID);
cs = intel_ring_begin(req, 4);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = dw1 | wait_mbox;
/* Throughout all of the GEM code, seqno passed implies our current
* seqno is >= the last seqno executed. However for hardware the
* comparison is strictly greater than.
*/
*cs++ = signal->global_seqno - 1;
*cs++ = 0;
*cs++ = MI_NOOP;
intel_ring_advance(req, cs);
return 0;
}
static void
gen5_seqno_barrier(struct intel_engine_cs *engine)
{
/* MI_STORE are internally buffered by the GPU and not flushed
* either by MI_FLUSH or SyncFlush or any other combination of
* MI commands.
*
* "Only the submission of the store operation is guaranteed.
* The write result will be complete (coherent) some time later
* (this is practically a finite period but there is no guaranteed
* latency)."
*
* Empirically, we observe that we need a delay of at least 75us to
* be sure that the seqno write is visible by the CPU.
*/
usleep_range(125, 250);
}
static void
gen6_seqno_barrier(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
/* Workaround to force correct ordering between irq and seqno writes on
* ivb (and maybe also on snb) by reading from a CS register (like
* ACTHD) before reading the status page.
*
* Note that this effectively stalls the read by the time it takes to
* do a memory transaction, which more or less ensures that the write
* from the GPU has sufficient time to invalidate the CPU cacheline.
* Alternatively we could delay the interrupt from the CS ring to give
* the write time to land, but that would incur a delay after every
* batch i.e. much more frequent than a delay when waiting for the
* interrupt (with the same net latency).
*
* Also note that to prevent whole machine hangs on gen7, we have to
* take the spinlock to guard against concurrent cacheline access.
*/
spin_lock_irq(&dev_priv->uncore.lock);
POSTING_READ_FW(RING_ACTHD(engine->mmio_base));
spin_unlock_irq(&dev_priv->uncore.lock);
}
static void
gen5_irq_enable(struct intel_engine_cs *engine)
{
gen5_enable_gt_irq(engine->i915, engine->irq_enable_mask);
}
static void
gen5_irq_disable(struct intel_engine_cs *engine)
{
gen5_disable_gt_irq(engine->i915, engine->irq_enable_mask);
}
static void
i9xx_irq_enable(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
dev_priv->irq_mask &= ~engine->irq_enable_mask;
I915_WRITE(IMR, dev_priv->irq_mask);
POSTING_READ_FW(RING_IMR(engine->mmio_base));
}
static void
i9xx_irq_disable(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
dev_priv->irq_mask |= engine->irq_enable_mask;
I915_WRITE(IMR, dev_priv->irq_mask);
}
static void
i8xx_irq_enable(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
dev_priv->irq_mask &= ~engine->irq_enable_mask;
I915_WRITE16(IMR, dev_priv->irq_mask);
POSTING_READ16(RING_IMR(engine->mmio_base));
}
static void
i8xx_irq_disable(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
dev_priv->irq_mask |= engine->irq_enable_mask;
I915_WRITE16(IMR, dev_priv->irq_mask);
}
static int
bsd_ring_flush(struct drm_i915_gem_request *req, u32 mode)
{
u32 *cs;
cs = intel_ring_begin(req, 2);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = MI_FLUSH;
*cs++ = MI_NOOP;
intel_ring_advance(req, cs);
return 0;
}
static void
gen6_irq_enable(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));
gen5_enable_gt_irq(dev_priv, engine->irq_enable_mask);
}
static void
gen6_irq_disable(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
I915_WRITE_IMR(engine, ~engine->irq_keep_mask);
gen5_disable_gt_irq(dev_priv, engine->irq_enable_mask);
}
static void
hsw_vebox_irq_enable(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
I915_WRITE_IMR(engine, ~engine->irq_enable_mask);
gen6_unmask_pm_irq(dev_priv, engine->irq_enable_mask);
}
static void
hsw_vebox_irq_disable(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
I915_WRITE_IMR(engine, ~0);
gen6_mask_pm_irq(dev_priv, engine->irq_enable_mask);
}
static void
gen8_irq_enable(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_irq_disable(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
I915_WRITE_IMR(engine, ~engine->irq_keep_mask);
}
static int
i965_emit_bb_start(struct drm_i915_gem_request *req,
u64 offset, u32 length,
unsigned int dispatch_flags)
{
u32 *cs;
cs = intel_ring_begin(req, 2);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = MI_BATCH_BUFFER_START | MI_BATCH_GTT | (dispatch_flags &
I915_DISPATCH_SECURE ? 0 : MI_BATCH_NON_SECURE_I965);
*cs++ = offset;
intel_ring_advance(req, cs);
return 0;
}
/* Just userspace ABI convention to limit the wa batch bo to a resonable size */
#define I830_BATCH_LIMIT (256*1024)
#define I830_TLB_ENTRIES (2)
#define I830_WA_SIZE max(I830_TLB_ENTRIES*4096, I830_BATCH_LIMIT)
static int
i830_emit_bb_start(struct drm_i915_gem_request *req,
u64 offset, u32 len,
unsigned int dispatch_flags)
{
u32 *cs, cs_offset = i915_ggtt_offset(req->engine->scratch);
cs = intel_ring_begin(req, 6);
if (IS_ERR(cs))
return PTR_ERR(cs);
/* Evict the invalid PTE TLBs */
*cs++ = COLOR_BLT_CMD | BLT_WRITE_RGBA;
*cs++ = BLT_DEPTH_32 | BLT_ROP_COLOR_COPY | 4096;
*cs++ = I830_TLB_ENTRIES << 16 | 4; /* load each page */
*cs++ = cs_offset;
*cs++ = 0xdeadbeef;
*cs++ = MI_NOOP;
intel_ring_advance(req, cs);
if ((dispatch_flags & I915_DISPATCH_PINNED) == 0) {
if (len > I830_BATCH_LIMIT)
return -ENOSPC;
cs = intel_ring_begin(req, 6 + 2);
if (IS_ERR(cs))
return PTR_ERR(cs);
/* Blit the batch (which has now all relocs applied) to the
* stable batch scratch bo area (so that the CS never
* stumbles over its tlb invalidation bug) ...
*/
*cs++ = SRC_COPY_BLT_CMD | BLT_WRITE_RGBA;
*cs++ = BLT_DEPTH_32 | BLT_ROP_SRC_COPY | 4096;
*cs++ = DIV_ROUND_UP(len, 4096) << 16 | 4096;
*cs++ = cs_offset;
*cs++ = 4096;
*cs++ = offset;
*cs++ = MI_FLUSH;
*cs++ = MI_NOOP;
intel_ring_advance(req, cs);
/* ... and execute it. */
offset = cs_offset;
}
cs = intel_ring_begin(req, 2);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = MI_BATCH_BUFFER_START | MI_BATCH_GTT;
*cs++ = offset | (dispatch_flags & I915_DISPATCH_SECURE ? 0 :
MI_BATCH_NON_SECURE);
intel_ring_advance(req, cs);
return 0;
}
static int
i915_emit_bb_start(struct drm_i915_gem_request *req,
u64 offset, u32 len,
unsigned int dispatch_flags)
{
u32 *cs;
cs = intel_ring_begin(req, 2);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = MI_BATCH_BUFFER_START | MI_BATCH_GTT;
*cs++ = offset | (dispatch_flags & I915_DISPATCH_SECURE ? 0 :
MI_BATCH_NON_SECURE);
intel_ring_advance(req, cs);
return 0;
}
int intel_ring_pin(struct intel_ring *ring,
struct drm_i915_private *i915,
unsigned int offset_bias)
{
enum i915_map_type map = HAS_LLC(i915) ? I915_MAP_WB : I915_MAP_WC;
struct i915_vma *vma = ring->vma;
unsigned int flags;
void *addr;
int ret;
GEM_BUG_ON(ring->vaddr);
flags = PIN_GLOBAL;
if (offset_bias)
flags |= PIN_OFFSET_BIAS | offset_bias;
if (vma->obj->stolen)
flags |= PIN_MAPPABLE;
if (!(vma->flags & I915_VMA_GLOBAL_BIND)) {
if (flags & PIN_MAPPABLE || map == I915_MAP_WC)
ret = i915_gem_object_set_to_gtt_domain(vma->obj, true);
else
ret = i915_gem_object_set_to_cpu_domain(vma->obj, true);
if (unlikely(ret))
return ret;
}
ret = i915_vma_pin(vma, 0, PAGE_SIZE, flags);
if (unlikely(ret))
return ret;
if (i915_vma_is_map_and_fenceable(vma))
addr = (void __force *)i915_vma_pin_iomap(vma);
else
addr = i915_gem_object_pin_map(vma->obj, map);
if (IS_ERR(addr))
goto err;
vma->obj->pin_global++;
ring->vaddr = addr;
return 0;
err:
i915_vma_unpin(vma);
return PTR_ERR(addr);
}
void intel_ring_reset(struct intel_ring *ring, u32 tail)
{
GEM_BUG_ON(!list_empty(&ring->request_list));
ring->tail = tail;
ring->head = tail;
ring->emit = tail;
intel_ring_update_space(ring);
}
void intel_ring_unpin(struct intel_ring *ring)
{
GEM_BUG_ON(!ring->vma);
GEM_BUG_ON(!ring->vaddr);
/* Discard any unused bytes beyond that submitted to hw. */
intel_ring_reset(ring, ring->tail);
if (i915_vma_is_map_and_fenceable(ring->vma))
i915_vma_unpin_iomap(ring->vma);
else
i915_gem_object_unpin_map(ring->vma->obj);
ring->vaddr = NULL;
ring->vma->obj->pin_global--;
i915_vma_unpin(ring->vma);
}
static struct i915_vma *
intel_ring_create_vma(struct drm_i915_private *dev_priv, int size)
{
struct drm_i915_gem_object *obj;
struct i915_vma *vma;
obj = i915_gem_object_create_stolen(dev_priv, size);
if (!obj)
obj = i915_gem_object_create_internal(dev_priv, size);
if (IS_ERR(obj))
return ERR_CAST(obj);
/* mark ring buffers as read-only from GPU side by default */
obj->gt_ro = 1;
vma = i915_vma_instance(obj, &dev_priv->ggtt.base, NULL);
if (IS_ERR(vma))
goto err;
return vma;
err:
i915_gem_object_put(obj);
return vma;
}
struct intel_ring *
intel_engine_create_ring(struct intel_engine_cs *engine, int size)
{
struct intel_ring *ring;
struct i915_vma *vma;
GEM_BUG_ON(!is_power_of_2(size));
GEM_BUG_ON(RING_CTL_SIZE(size) & ~RING_NR_PAGES);
ring = kzalloc(sizeof(*ring), GFP_KERNEL);
if (!ring)
return ERR_PTR(-ENOMEM);
INIT_LIST_HEAD(&ring->request_list);
ring->size = size;
/* Workaround an erratum on the i830 which causes a hang if
* the TAIL pointer points to within the last 2 cachelines
* of the buffer.
*/
ring->effective_size = size;
if (IS_I830(engine->i915) || IS_I845G(engine->i915))
ring->effective_size -= 2 * CACHELINE_BYTES;
intel_ring_update_space(ring);
vma = intel_ring_create_vma(engine->i915, size);
if (IS_ERR(vma)) {
kfree(ring);
return ERR_CAST(vma);
}
ring->vma = vma;
return ring;
}
void
intel_ring_free(struct intel_ring *ring)
{
struct drm_i915_gem_object *obj = ring->vma->obj;
i915_vma_close(ring->vma);
__i915_gem_object_release_unless_active(obj);
kfree(ring);
}
static int context_pin(struct i915_gem_context *ctx)
{
struct i915_vma *vma = ctx->engine[RCS].state;
int ret;
/*
* Clear this page out of any CPU caches for coherent swap-in/out.
* We only want to do this on the first bind so that we do not stall
* on an active context (which by nature is already on the GPU).
*/
if (!(vma->flags & I915_VMA_GLOBAL_BIND)) {
ret = i915_gem_object_set_to_gtt_domain(vma->obj, true);
if (ret)
return ret;
}
return i915_vma_pin(vma, 0, I915_GTT_MIN_ALIGNMENT,
PIN_GLOBAL | PIN_HIGH);
}
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(i915, engine->context_size);
if (IS_ERR(obj))
return ERR_CAST(obj);
if (engine->default_state) {
void *defaults, *vaddr;
vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB);
if (IS_ERR(vaddr)) {
err = PTR_ERR(vaddr);
goto err_obj;
}
defaults = i915_gem_object_pin_map(engine->default_state,
I915_MAP_WB);
if (IS_ERR(defaults)) {
err = PTR_ERR(defaults);
goto err_map;
}
memcpy(vaddr, defaults, engine->context_size);
i915_gem_object_unpin_map(engine->default_state);
i915_gem_object_unpin_map(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)) {
/* Ignore any error, regard it as a simple optimisation */
i915_gem_object_set_cache_level(obj, I915_CACHE_L3_LLC);
}
vma = i915_vma_instance(obj, &i915->ggtt.base, NULL);
if (IS_ERR(vma)) {
err = PTR_ERR(vma);
goto err_obj;
}
return vma;
err_map:
i915_gem_object_unpin_map(obj);
err_obj:
i915_gem_object_put(obj);
return ERR_PTR(err);
}
static struct intel_ring *
intel_ring_context_pin(struct intel_engine_cs *engine,
struct i915_gem_context *ctx)
{
struct intel_context *ce = &ctx->engine[engine->id];
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 && engine->context_size) {
struct i915_vma *vma;
vma = alloc_context_vma(engine);
if (IS_ERR(vma)) {
ret = PTR_ERR(vma);
goto err;
}
ce->state = vma;
}
if (ce->state) {
ret = context_pin(ctx);
if (ret)
goto err;
ce->state->obj->pin_global++;
}
i915_gem_context_get(ctx);
out:
/* One ringbuffer to rule them all */
return engine->buffer;
err:
ce->pin_count = 0;
return ERR_PTR(ret);
}
static void intel_ring_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;
if (ce->state) {
ce->state->obj->pin_global--;
i915_vma_unpin(ce->state);
}
i915_gem_context_put(ctx);
}
static int intel_init_ring_buffer(struct intel_engine_cs *engine)
{
struct intel_ring *ring;
int err;
intel_engine_setup_common(engine);
err = intel_engine_init_common(engine);
if (err)
goto err;
ring = intel_engine_create_ring(engine, 32 * PAGE_SIZE);
if (IS_ERR(ring)) {
err = PTR_ERR(ring);
goto err;
}
/* Ring wraparound at offset 0 sometimes hangs. No idea why. */
err = intel_ring_pin(ring, engine->i915, I915_GTT_PAGE_SIZE);
if (err)
goto err_ring;
GEM_BUG_ON(engine->buffer);
engine->buffer = ring;
return 0;
err_ring:
intel_ring_free(ring);
err:
intel_engine_cleanup_common(engine);
return err;
}
void intel_engine_cleanup(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
WARN_ON(INTEL_GEN(dev_priv) > 2 &&
(I915_READ_MODE(engine) & MODE_IDLE) == 0);
intel_ring_unpin(engine->buffer);
intel_ring_free(engine->buffer);
if (engine->cleanup)
engine->cleanup(engine);
intel_engine_cleanup_common(engine);
dev_priv->engine[engine->id] = NULL;
kfree(engine);
}
void intel_legacy_submission_resume(struct drm_i915_private *dev_priv)
{
struct intel_engine_cs *engine;
enum intel_engine_id id;
/* Restart from the beginning of the rings for convenience */
for_each_engine(engine, dev_priv, id)
intel_ring_reset(engine->buffer, 0);
}
static int ring_request_alloc(struct drm_i915_gem_request *request)
{
int ret;
GEM_BUG_ON(!request->ctx->engine[request->engine->id].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 += LEGACY_REQUEST_SIZE;
ret = intel_ring_wait_for_space(request->ring, request->reserved_space);
if (ret)
return ret;
request->reserved_space -= LEGACY_REQUEST_SIZE;
return 0;
}
static noinline int wait_for_space(struct intel_ring *ring, unsigned int bytes)
{
struct drm_i915_gem_request *target;
long timeout;
lockdep_assert_held(&ring->vma->vm->i915->drm.struct_mutex);
if (intel_ring_update_space(ring) >= bytes)
return 0;
list_for_each_entry(target, &ring->request_list, ring_link) {
/* Would completion of this request free enough space? */
if (bytes <= __intel_ring_space(target->postfix,
ring->emit, ring->size))
break;
}
if (WARN_ON(&target->ring_link == &ring->request_list))
return -ENOSPC;
timeout = i915_wait_request(target,
I915_WAIT_INTERRUPTIBLE | I915_WAIT_LOCKED,
MAX_SCHEDULE_TIMEOUT);
if (timeout < 0)
return timeout;
i915_gem_request_retire_upto(target);
intel_ring_update_space(ring);
GEM_BUG_ON(ring->space < bytes);
return 0;
}
int intel_ring_wait_for_space(struct intel_ring *ring, unsigned int bytes)
{
GEM_BUG_ON(bytes > ring->effective_size);
if (unlikely(bytes > ring->effective_size - ring->emit))
bytes += ring->size - ring->emit;
if (unlikely(bytes > ring->space)) {
int ret = wait_for_space(ring, bytes);
if (unlikely(ret))
return ret;
}
GEM_BUG_ON(ring->space < bytes);
return 0;
}
u32 *intel_ring_begin(struct drm_i915_gem_request *req,
unsigned int num_dwords)
{
struct intel_ring *ring = req->ring;
const unsigned int remain_usable = ring->effective_size - ring->emit;
const unsigned int bytes = num_dwords * sizeof(u32);
unsigned int need_wrap = 0;
unsigned int total_bytes;
u32 *cs;
/* Packets must be qword aligned. */
GEM_BUG_ON(num_dwords & 1);
total_bytes = bytes + req->reserved_space;
GEM_BUG_ON(total_bytes > ring->effective_size);
if (unlikely(total_bytes > remain_usable)) {
const int remain_actual = ring->size - ring->emit;
if (bytes > remain_usable) {
/*
* Not enough space for the basic request. So need to
* flush out the remainder and then wait for
* base + reserved.
*/
total_bytes += remain_actual;
need_wrap = remain_actual | 1;
} else {
/*
* The base request will fit but the reserved space
* falls off the end. So we don't need an immediate
* wrap and only need to effectively wait for the
* reserved size from the start of ringbuffer.
*/
total_bytes = req->reserved_space + remain_actual;
}
}
if (unlikely(total_bytes > ring->space)) {
int ret;
/*
* Space is reserved in the ringbuffer for finalising the
* request, as that cannot be allowed to fail. During request
* finalisation, reserved_space is set to 0 to stop the
* overallocation and the assumption is that then we never need
* to wait (which has the risk of failing with EINTR).
*
* See also i915_gem_request_alloc() and i915_add_request().
*/
GEM_BUG_ON(!req->reserved_space);
ret = wait_for_space(ring, total_bytes);
if (unlikely(ret))
return ERR_PTR(ret);
}
if (unlikely(need_wrap)) {
need_wrap &= ~1;
GEM_BUG_ON(need_wrap > ring->space);
GEM_BUG_ON(ring->emit + need_wrap > ring->size);
/* Fill the tail with MI_NOOP */
memset(ring->vaddr + ring->emit, 0, need_wrap);
ring->emit = 0;
ring->space -= need_wrap;
}
GEM_BUG_ON(ring->emit > ring->size - bytes);
GEM_BUG_ON(ring->space < bytes);
cs = ring->vaddr + ring->emit;
GEM_DEBUG_EXEC(memset(cs, POISON_INUSE, bytes));
ring->emit += bytes;
ring->space -= bytes;
return cs;
}
/* Align the ring tail to a cacheline boundary */
int intel_ring_cacheline_align(struct drm_i915_gem_request *req)
{
int num_dwords =
(req->ring->emit & (CACHELINE_BYTES - 1)) / sizeof(uint32_t);
u32 *cs;
if (num_dwords == 0)
return 0;
num_dwords = CACHELINE_BYTES / sizeof(uint32_t) - num_dwords;
cs = intel_ring_begin(req, num_dwords);
if (IS_ERR(cs))
return PTR_ERR(cs);
while (num_dwords--)
*cs++ = MI_NOOP;
intel_ring_advance(req, cs);
return 0;
}
static void gen6_bsd_submit_request(struct drm_i915_gem_request *request)
{
struct drm_i915_private *dev_priv = request->i915;
intel_uncore_forcewake_get(dev_priv, 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.
*/
I915_WRITE_FW(GEN6_BSD_SLEEP_PSMI_CONTROL,
_MASKED_BIT_ENABLE(GEN6_BSD_SLEEP_MSG_DISABLE));
/* Clear the context id. Here be magic! */
I915_WRITE64_FW(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(dev_priv,
GEN6_BSD_SLEEP_PSMI_CONTROL,
GEN6_BSD_SLEEP_INDICATOR,
0,
1000, 0, NULL))
DRM_ERROR("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.
*/
I915_WRITE_FW(GEN6_BSD_SLEEP_PSMI_CONTROL,
_MASKED_BIT_DISABLE(GEN6_BSD_SLEEP_MSG_DISABLE));
intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
}
static int gen6_bsd_ring_flush(struct drm_i915_gem_request *req, u32 mode)
{
u32 cmd, *cs;
cs = intel_ring_begin(req, 4);
if (IS_ERR(cs))
return PTR_ERR(cs);
cmd = MI_FLUSH_DW;
if (INTEL_GEN(req->i915) >= 8)
cmd += 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;
/*
* Bspec vol 1c.5 - video engine command streamer:
* "If ENABLED, all TLBs will be invalidated once the flush
* operation is complete. This bit is only valid when the
* Post-Sync Operation field is a value of 1h or 3h."
*/
if (mode & EMIT_INVALIDATE)
cmd |= MI_INVALIDATE_TLB | MI_INVALIDATE_BSD;
*cs++ = cmd;
*cs++ = I915_GEM_HWS_SCRATCH_ADDR | MI_FLUSH_DW_USE_GTT;
if (INTEL_GEN(req->i915) >= 8) {
*cs++ = 0; /* upper addr */
*cs++ = 0; /* value */
} else {
*cs++ = 0;
*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,
unsigned int dispatch_flags)
{
bool ppgtt = USES_PPGTT(req->i915) &&
!(dispatch_flags & I915_DISPATCH_SECURE);
u32 *cs;
cs = intel_ring_begin(req, 4);
if (IS_ERR(cs))
return PTR_ERR(cs);
/* FIXME(BDW): Address space and security selectors. */
*cs++ = MI_BATCH_BUFFER_START_GEN8 | (ppgtt << 8) | (dispatch_flags &
I915_DISPATCH_RS ? MI_BATCH_RESOURCE_STREAMER : 0);
*cs++ = lower_32_bits(offset);
*cs++ = upper_32_bits(offset);
*cs++ = MI_NOOP;
intel_ring_advance(req, cs);
return 0;
}
static int
hsw_emit_bb_start(struct drm_i915_gem_request *req,
u64 offset, u32 len,
unsigned int dispatch_flags)
{
u32 *cs;
cs = intel_ring_begin(req, 2);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = MI_BATCH_BUFFER_START | (dispatch_flags & I915_DISPATCH_SECURE ?
0 : MI_BATCH_PPGTT_HSW | MI_BATCH_NON_SECURE_HSW) |
(dispatch_flags & I915_DISPATCH_RS ?
MI_BATCH_RESOURCE_STREAMER : 0);
/* bit0-7 is the length on GEN6+ */
*cs++ = offset;
intel_ring_advance(req, cs);
return 0;
}
static int
gen6_emit_bb_start(struct drm_i915_gem_request *req,
u64 offset, u32 len,
unsigned int dispatch_flags)
{
u32 *cs;
cs = intel_ring_begin(req, 2);
if (IS_ERR(cs))
return PTR_ERR(cs);
*cs++ = MI_BATCH_BUFFER_START | (dispatch_flags & I915_DISPATCH_SECURE ?
0 : MI_BATCH_NON_SECURE_I965);
/* bit0-7 is the length on GEN6+ */
*cs++ = offset;
intel_ring_advance(req, cs);
return 0;
}
/* Blitter support (SandyBridge+) */
static int gen6_ring_flush(struct drm_i915_gem_request *req, u32 mode)
{
u32 cmd, *cs;
cs = intel_ring_begin(req, 4);
if (IS_ERR(cs))
return PTR_ERR(cs);
cmd = MI_FLUSH_DW;
if (INTEL_GEN(req->i915) >= 8)
cmd += 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;
/*
* Bspec vol 1c.3 - blitter engine command streamer:
* "If ENABLED, all TLBs will be invalidated once the flush
* operation is complete. This bit is only valid when the
* Post-Sync Operation field is a value of 1h or 3h."
*/
if (mode & EMIT_INVALIDATE)
cmd |= MI_INVALIDATE_TLB;
*cs++ = cmd;
*cs++ = I915_GEM_HWS_SCRATCH_ADDR | MI_FLUSH_DW_USE_GTT;
if (INTEL_GEN(req->i915) >= 8) {
*cs++ = 0; /* upper addr */
*cs++ = 0; /* value */
} else {
*cs++ = 0;
*cs++ = MI_NOOP;
}
intel_ring_advance(req, cs);
return 0;
}
static void intel_ring_init_semaphores(struct drm_i915_private *dev_priv,
struct intel_engine_cs *engine)
{
struct drm_i915_gem_object *obj;
int ret, i;
if (!i915_modparams.semaphores)
return;
if (INTEL_GEN(dev_priv) >= 8 && !dev_priv->semaphore) {
struct i915_vma *vma;
obj = i915_gem_object_create(dev_priv, PAGE_SIZE);
if (IS_ERR(obj))
goto err;
vma = i915_vma_instance(obj, &dev_priv->ggtt.base, NULL);
if (IS_ERR(vma))
goto err_obj;
ret = i915_gem_object_set_to_gtt_domain(obj, false);
if (ret)
goto err_obj;
ret = i915_vma_pin(vma, 0, 0, PIN_GLOBAL | PIN_HIGH);
if (ret)
goto err_obj;
dev_priv->semaphore = vma;
}
if (INTEL_GEN(dev_priv) >= 8) {
u32 offset = i915_ggtt_offset(dev_priv->semaphore);
engine->semaphore.sync_to = gen8_ring_sync_to;
engine->semaphore.signal = gen8_xcs_signal;
for (i = 0; i < I915_NUM_ENGINES; i++) {
u32 ring_offset;
if (i != engine->id)
ring_offset = offset + GEN8_SEMAPHORE_OFFSET(engine->id, i);
else
ring_offset = MI_SEMAPHORE_SYNC_INVALID;
engine->semaphore.signal_ggtt[i] = ring_offset;
}
} else if (INTEL_GEN(dev_priv) >= 6) {
engine->semaphore.sync_to = gen6_ring_sync_to;
engine->semaphore.signal = gen6_signal;
/*
* The current semaphore is only applied on pre-gen8
* platform. And there is no VCS2 ring on the pre-gen8
* platform. So the semaphore between RCS and VCS2 is
* initialized as INVALID. Gen8 will initialize the
* sema between VCS2 and RCS later.
*/
for (i = 0; i < GEN6_NUM_SEMAPHORES; i++) {
static const struct {
u32 wait_mbox;
i915_reg_t mbox_reg;
} sem_data[GEN6_NUM_SEMAPHORES][GEN6_NUM_SEMAPHORES] = {
[RCS_HW] = {
[VCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_RV, .mbox_reg = GEN6_VRSYNC },
[BCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_RB, .mbox_reg = GEN6_BRSYNC },
[VECS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_RVE, .mbox_reg = GEN6_VERSYNC },
},
[VCS_HW] = {
[RCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VR, .mbox_reg = GEN6_RVSYNC },
[BCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VB, .mbox_reg = GEN6_BVSYNC },
[VECS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VVE, .mbox_reg = GEN6_VEVSYNC },
},
[BCS_HW] = {
[RCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_BR, .mbox_reg = GEN6_RBSYNC },
[VCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_BV, .mbox_reg = GEN6_VBSYNC },
[VECS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_BVE, .mbox_reg = GEN6_VEBSYNC },
},
[VECS_HW] = {
[RCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VER, .mbox_reg = GEN6_RVESYNC },
[VCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VEV, .mbox_reg = GEN6_VVESYNC },
[BCS_HW] = { .wait_mbox = MI_SEMAPHORE_SYNC_VEB, .mbox_reg = GEN6_BVESYNC },
},
};
u32 wait_mbox;
i915_reg_t mbox_reg;
if (i == engine->hw_id) {
wait_mbox = MI_SEMAPHORE_SYNC_INVALID;
mbox_reg = GEN6_NOSYNC;
} else {
wait_mbox = sem_data[engine->hw_id][i].wait_mbox;
mbox_reg = sem_data[engine->hw_id][i].mbox_reg;
}
engine->semaphore.mbox.wait[i] = wait_mbox;
engine->semaphore.mbox.signal[i] = mbox_reg;
}
}
return;
err_obj:
i915_gem_object_put(obj);
err:
DRM_DEBUG_DRIVER("Failed to allocate space for semaphores, disabling\n");
i915_modparams.semaphores = 0;
}
static void intel_ring_init_irq(struct drm_i915_private *dev_priv,
struct intel_engine_cs *engine)
{
engine->irq_enable_mask = GT_RENDER_USER_INTERRUPT << engine->irq_shift;
if (INTEL_GEN(dev_priv) >= 8) {
engine->irq_enable = gen8_irq_enable;
engine->irq_disable = gen8_irq_disable;
engine->irq_seqno_barrier = gen6_seqno_barrier;
} else if (INTEL_GEN(dev_priv) >= 6) {
engine->irq_enable = gen6_irq_enable;
engine->irq_disable = gen6_irq_disable;
engine->irq_seqno_barrier = gen6_seqno_barrier;
} else if (INTEL_GEN(dev_priv) >= 5) {
engine->irq_enable = gen5_irq_enable;
engine->irq_disable = gen5_irq_disable;
engine->irq_seqno_barrier = gen5_seqno_barrier;
} else if (INTEL_GEN(dev_priv) >= 3) {
engine->irq_enable = i9xx_irq_enable;
engine->irq_disable = i9xx_irq_disable;
} else {
engine->irq_enable = i8xx_irq_enable;
engine->irq_disable = i8xx_irq_disable;
}
}
static void i9xx_set_default_submission(struct intel_engine_cs *engine)
{
engine->submit_request = i9xx_submit_request;
engine->cancel_requests = cancel_requests;
engine->park = NULL;
engine->unpark = NULL;
}
static void gen6_bsd_set_default_submission(struct intel_engine_cs *engine)
{
i9xx_set_default_submission(engine);
engine->submit_request = gen6_bsd_submit_request;
}
static void intel_ring_default_vfuncs(struct drm_i915_private *dev_priv,
struct intel_engine_cs *engine)
{
intel_ring_init_irq(dev_priv, engine);
intel_ring_init_semaphores(dev_priv, engine);
engine->init_hw = init_ring_common;
engine->reset_hw = reset_ring_common;
engine->context_pin = intel_ring_context_pin;
engine->context_unpin = intel_ring_context_unpin;
engine->request_alloc = ring_request_alloc;
engine->emit_breadcrumb = i9xx_emit_breadcrumb;
engine->emit_breadcrumb_sz = i9xx_emit_breadcrumb_sz;
if (i915_modparams.semaphores) {
int num_rings;
engine->emit_breadcrumb = gen6_sema_emit_breadcrumb;
num_rings = INTEL_INFO(dev_priv)->num_rings - 1;
if (INTEL_GEN(dev_priv) >= 8) {
engine->emit_breadcrumb_sz += num_rings * 6;
} else {
engine->emit_breadcrumb_sz += num_rings * 3;
if (num_rings & 1)
engine->emit_breadcrumb_sz++;
}
}
engine->set_default_submission = i9xx_set_default_submission;
if (INTEL_GEN(dev_priv) >= 8)
engine->emit_bb_start = gen8_emit_bb_start;
else if (INTEL_GEN(dev_priv) >= 6)
engine->emit_bb_start = gen6_emit_bb_start;
else if (INTEL_GEN(dev_priv) >= 4)
engine->emit_bb_start = i965_emit_bb_start;
else if (IS_I830(dev_priv) || IS_I845G(dev_priv))
engine->emit_bb_start = i830_emit_bb_start;
else
engine->emit_bb_start = i915_emit_bb_start;
}
int intel_init_render_ring_buffer(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
int ret;
intel_ring_default_vfuncs(dev_priv, engine);
if (HAS_L3_DPF(dev_priv))
engine->irq_keep_mask = GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
if (INTEL_GEN(dev_priv) >= 8) {
engine->init_context = intel_rcs_ctx_init;
engine->emit_breadcrumb = gen8_render_emit_breadcrumb;
engine->emit_breadcrumb_sz = gen8_render_emit_breadcrumb_sz;
engine->emit_flush = gen8_render_ring_flush;
if (i915_modparams.semaphores) {
int num_rings;
engine->semaphore.signal = gen8_rcs_signal;
num_rings = INTEL_INFO(dev_priv)->num_rings - 1;
engine->emit_breadcrumb_sz += num_rings * 8;
}
} else if (INTEL_GEN(dev_priv) >= 6) {
engine->init_context = intel_rcs_ctx_init;
engine->emit_flush = gen7_render_ring_flush;
if (IS_GEN6(dev_priv))
engine->emit_flush = gen6_render_ring_flush;
} else if (IS_GEN5(dev_priv)) {
engine->emit_flush = gen4_render_ring_flush;
} else {
if (INTEL_GEN(dev_priv) < 4)
engine->emit_flush = gen2_render_ring_flush;
else
engine->emit_flush = gen4_render_ring_flush;
engine->irq_enable_mask = I915_USER_INTERRUPT;
}
if (IS_HASWELL(dev_priv))
engine->emit_bb_start = hsw_emit_bb_start;
engine->init_hw = init_render_ring;
engine->cleanup = render_ring_cleanup;
ret = intel_init_ring_buffer(engine);
if (ret)
return ret;
if (INTEL_GEN(dev_priv) >= 6) {
ret = intel_engine_create_scratch(engine, PAGE_SIZE);
if (ret)
return ret;
} else if (HAS_BROKEN_CS_TLB(dev_priv)) {
ret = intel_engine_create_scratch(engine, I830_WA_SIZE);
if (ret)
return ret;
}
return 0;
}
int intel_init_bsd_ring_buffer(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
intel_ring_default_vfuncs(dev_priv, engine);
if (INTEL_GEN(dev_priv) >= 6) {
/* gen6 bsd needs a special wa for tail updates */
if (IS_GEN6(dev_priv))
engine->set_default_submission = gen6_bsd_set_default_submission;
engine->emit_flush = gen6_bsd_ring_flush;
if (INTEL_GEN(dev_priv) < 8)
engine->irq_enable_mask = GT_BSD_USER_INTERRUPT;
} else {
engine->mmio_base = BSD_RING_BASE;
engine->emit_flush = bsd_ring_flush;
if (IS_GEN5(dev_priv))
engine->irq_enable_mask = ILK_BSD_USER_INTERRUPT;
else
engine->irq_enable_mask = I915_BSD_USER_INTERRUPT;
}
return intel_init_ring_buffer(engine);
}
int intel_init_blt_ring_buffer(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
intel_ring_default_vfuncs(dev_priv, engine);
engine->emit_flush = gen6_ring_flush;
if (INTEL_GEN(dev_priv) < 8)
engine->irq_enable_mask = GT_BLT_USER_INTERRUPT;
return intel_init_ring_buffer(engine);
}
int intel_init_vebox_ring_buffer(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
intel_ring_default_vfuncs(dev_priv, engine);
engine->emit_flush = gen6_ring_flush;
if (INTEL_GEN(dev_priv) < 8) {
engine->irq_enable_mask = PM_VEBOX_USER_INTERRUPT;
engine->irq_enable = hsw_vebox_irq_enable;
engine->irq_disable = hsw_vebox_irq_disable;
}
return intel_init_ring_buffer(engine);
}
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