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linux/drivers/gpu/drm/i915/intel_lrc.c
Zhi Wang 80a9a8db16 drm/i915: Support LRC context single submission 
This patch introduces the support of LRC context single submission.
As GVT context may come from different guests, which require different
configuration of render registers. It can't be combined into a dual ELSP
submission combo.

Only GVT-g will create this kinds of GEM context currently.

v8:

- Rename the data member in struct i915_gem_context. (Chris)

v7:

- Fix typos in commit message. (Joonas)

v6:
- Make GVT code as dead code when !CONFIG_DRM_I915_GVT. (Chris)

v5:

- Only compile this feature when CONFIG_DRM_I915_GVT=y. (Tvrtko)

Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1466078825-6662-9-git-send-email-zhi.a.wang@intel.com
2016-06-17 20:36:37 +01:00

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/*
* Copyright © 2014 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Ben Widawsky <ben@bwidawsk.net>
* Michel Thierry <michel.thierry@intel.com>
* Thomas Daniel <thomas.daniel@intel.com>
* Oscar Mateo <oscar.mateo@intel.com>
*
*/
/**
* DOC: Logical Rings, Logical Ring Contexts and Execlists
*
* Motivation:
* GEN8 brings an expansion of the HW contexts: "Logical Ring Contexts".
* These expanded contexts enable a number of new abilities, especially
* "Execlists" (also implemented in this file).
*
* One of the main differences with the legacy HW contexts is that logical
* ring contexts incorporate many more things to the context's state, like
* PDPs or ringbuffer control registers:
*
* The reason why PDPs are included in the context is straightforward: as
* PPGTTs (per-process GTTs) are actually per-context, having the PDPs
* contained there mean you don't need to do a ppgtt->switch_mm yourself,
* instead, the GPU will do it for you on the context switch.
*
* But, what about the ringbuffer control registers (head, tail, etc..)?
* shouldn't we just need a set of those per engine command streamer? This is
* where the name "Logical Rings" starts to make sense: by virtualizing the
* rings, the engine cs shifts to a new "ring buffer" with every context
* switch. When you want to submit a workload to the GPU you: A) choose your
* context, B) find its appropriate virtualized ring, C) write commands to it
* and then, finally, D) tell the GPU to switch to that context.
*
* Instead of the legacy MI_SET_CONTEXT, the way you tell the GPU to switch
* to a contexts is via a context execution list, ergo "Execlists".
*
* LRC implementation:
* Regarding the creation of contexts, we have:
*
* - One global default context.
* - One local default context for each opened fd.
* - One local extra context for each context create ioctl call.
*
* Now that ringbuffers belong per-context (and not per-engine, like before)
* and that contexts are uniquely tied to a given engine (and not reusable,
* like before) we need:
*
* - One ringbuffer per-engine inside each context.
* - One backing object per-engine inside each context.
*
* The global default context starts its life with these new objects fully
* allocated and populated. The local default context for each opened fd is
* more complex, because we don't know at creation time which engine is going
* to use them. To handle this, we have implemented a deferred creation of LR
* contexts:
*
* The local context starts its life as a hollow or blank holder, that only
* gets populated for a given engine once we receive an execbuffer. If later
* on we receive another execbuffer ioctl for the same context but a different
* engine, we allocate/populate a new ringbuffer and context backing object and
* so on.
*
* Finally, regarding local contexts created using the ioctl call: as they are
* only allowed with the render ring, we can allocate & populate them right
* away (no need to defer anything, at least for now).
*
* Execlists implementation:
* Execlists are the new method by which, on gen8+ hardware, workloads are
* submitted for execution (as opposed to the legacy, ringbuffer-based, method).
* This method works as follows:
*
* When a request is committed, its commands (the BB start and any leading or
* trailing commands, like the seqno breadcrumbs) are placed in the ringbuffer
* for the appropriate context. The tail pointer in the hardware context is not
* updated at this time, but instead, kept by the driver in the ringbuffer
* structure. A structure representing this request is added to a request queue
* for the appropriate engine: this structure contains a copy of the context's
* tail after the request was written to the ring buffer and a pointer to the
* context itself.
*
* If the engine's request queue was empty before the request was added, the
* queue is processed immediately. Otherwise the queue will be processed during
* a context switch interrupt. In any case, elements on the queue will get sent
* (in pairs) to the GPU's ExecLists Submit Port (ELSP, for short) with a
* globally unique 20-bits submission ID.
*
* When execution of a request completes, the GPU updates the context status
* buffer with a context complete event and generates a context switch interrupt.
* During the interrupt handling, the driver examines the events in the buffer:
* for each context complete event, if the announced ID matches that on the head
* of the request queue, then that request is retired and removed from the queue.
*
* After processing, if any requests were retired and the queue is not empty
* then a new execution list can be submitted. The two requests at the front of
* the queue are next to be submitted but since a context may not occur twice in
* an execution list, if subsequent requests have the same ID as the first then
* the two requests must be combined. This is done simply by discarding requests
* at the head of the queue until either only one requests is left (in which case
* we use a NULL second context) or the first two requests have unique IDs.
*
* By always executing the first two requests in the queue the driver ensures
* that the GPU is kept as busy as possible. In the case where a single context
* completes but a second context is still executing, the request for this second
* context will be at the head of the queue when we remove the first one. This
* request will then be resubmitted along with a new request for a different context,
* which will cause the hardware to continue executing the second request and queue
* the new request (the GPU detects the condition of a context getting preempted
* with the same context and optimizes the context switch flow by not doing
* preemption, but just sampling the new tail pointer).
*
*/
#include <linux/interrupt.h>
#include <drm/drmP.h>
#include <drm/i915_drm.h>
#include "i915_drv.h"
#include "intel_mocs.h"
#define GEN9_LR_CONTEXT_RENDER_SIZE (22 * PAGE_SIZE)
#define GEN8_LR_CONTEXT_RENDER_SIZE (20 * PAGE_SIZE)
#define GEN8_LR_CONTEXT_OTHER_SIZE (2 * PAGE_SIZE)
#define RING_EXECLIST_QFULL (1 << 0x2)
#define RING_EXECLIST1_VALID (1 << 0x3)
#define RING_EXECLIST0_VALID (1 << 0x4)
#define RING_EXECLIST_ACTIVE_STATUS (3 << 0xE)
#define RING_EXECLIST1_ACTIVE (1 << 0x11)
#define RING_EXECLIST0_ACTIVE (1 << 0x12)
#define GEN8_CTX_STATUS_IDLE_ACTIVE (1 << 0)
#define GEN8_CTX_STATUS_PREEMPTED (1 << 1)
#define GEN8_CTX_STATUS_ELEMENT_SWITCH (1 << 2)
#define GEN8_CTX_STATUS_ACTIVE_IDLE (1 << 3)
#define GEN8_CTX_STATUS_COMPLETE (1 << 4)
#define GEN8_CTX_STATUS_LITE_RESTORE (1 << 15)
#define CTX_LRI_HEADER_0 0x01
#define CTX_CONTEXT_CONTROL 0x02
#define CTX_RING_HEAD 0x04
#define CTX_RING_TAIL 0x06
#define CTX_RING_BUFFER_START 0x08
#define CTX_RING_BUFFER_CONTROL 0x0a
#define CTX_BB_HEAD_U 0x0c
#define CTX_BB_HEAD_L 0x0e
#define CTX_BB_STATE 0x10
#define CTX_SECOND_BB_HEAD_U 0x12
#define CTX_SECOND_BB_HEAD_L 0x14
#define CTX_SECOND_BB_STATE 0x16
#define CTX_BB_PER_CTX_PTR 0x18
#define CTX_RCS_INDIRECT_CTX 0x1a
#define CTX_RCS_INDIRECT_CTX_OFFSET 0x1c
#define CTX_LRI_HEADER_1 0x21
#define CTX_CTX_TIMESTAMP 0x22
#define CTX_PDP3_UDW 0x24
#define CTX_PDP3_LDW 0x26
#define CTX_PDP2_UDW 0x28
#define CTX_PDP2_LDW 0x2a
#define CTX_PDP1_UDW 0x2c
#define CTX_PDP1_LDW 0x2e
#define CTX_PDP0_UDW 0x30
#define CTX_PDP0_LDW 0x32
#define CTX_LRI_HEADER_2 0x41
#define CTX_R_PWR_CLK_STATE 0x42
#define CTX_GPGPU_CSR_BASE_ADDRESS 0x44
#define GEN8_CTX_VALID (1<<0)
#define GEN8_CTX_FORCE_PD_RESTORE (1<<1)
#define GEN8_CTX_FORCE_RESTORE (1<<2)
#define GEN8_CTX_L3LLC_COHERENT (1<<5)
#define GEN8_CTX_PRIVILEGE (1<<8)
#define ASSIGN_CTX_REG(reg_state, pos, reg, val) do { \
(reg_state)[(pos)+0] = i915_mmio_reg_offset(reg); \
(reg_state)[(pos)+1] = (val); \
} while (0)
#define ASSIGN_CTX_PDP(ppgtt, reg_state, n) do { \
const u64 _addr = i915_page_dir_dma_addr((ppgtt), (n)); \
reg_state[CTX_PDP ## n ## _UDW+1] = upper_32_bits(_addr); \
reg_state[CTX_PDP ## n ## _LDW+1] = lower_32_bits(_addr); \
} while (0)
#define ASSIGN_CTX_PML4(ppgtt, reg_state) do { \
reg_state[CTX_PDP0_UDW + 1] = upper_32_bits(px_dma(&ppgtt->pml4)); \
reg_state[CTX_PDP0_LDW + 1] = lower_32_bits(px_dma(&ppgtt->pml4)); \
} while (0)
enum {
FAULT_AND_HANG = 0,
FAULT_AND_HALT, /* Debug only */
FAULT_AND_STREAM,
FAULT_AND_CONTINUE /* Unsupported */
};
#define GEN8_CTX_ID_SHIFT 32
#define GEN8_CTX_ID_WIDTH 21
#define GEN8_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT 0x17
#define GEN9_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT 0x26
/* Typical size of the average request (2 pipecontrols and a MI_BB) */
#define EXECLISTS_REQUEST_SIZE 64 /* bytes */
static int execlists_context_deferred_alloc(struct i915_gem_context *ctx,
struct intel_engine_cs *engine);
static int intel_lr_context_pin(struct i915_gem_context *ctx,
struct intel_engine_cs *engine);
/**
* intel_sanitize_enable_execlists() - sanitize i915.enable_execlists
* @dev_priv: i915 device private
* @enable_execlists: value of i915.enable_execlists module parameter.
*
* Only certain platforms support Execlists (the prerequisites being
* support for Logical Ring Contexts and Aliasing PPGTT or better).
*
* Return: 1 if Execlists is supported and has to be enabled.
*/
int intel_sanitize_enable_execlists(struct drm_i915_private *dev_priv, int enable_execlists)
{
/* On platforms with execlist available, vGPU will only
* support execlist mode, no ring buffer mode.
*/
if (HAS_LOGICAL_RING_CONTEXTS(dev_priv) && intel_vgpu_active(dev_priv))
return 1;
if (INTEL_GEN(dev_priv) >= 9)
return 1;
if (enable_execlists == 0)
return 0;
if (HAS_LOGICAL_RING_CONTEXTS(dev_priv) &&
USES_PPGTT(dev_priv) &&
i915.use_mmio_flip >= 0)
return 1;
return 0;
}
static void
logical_ring_init_platform_invariants(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
if (IS_GEN8(dev_priv) || IS_GEN9(dev_priv))
engine->idle_lite_restore_wa = ~0;
engine->disable_lite_restore_wa = (IS_SKL_REVID(dev_priv, 0, SKL_REVID_B0) ||
IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1)) &&
(engine->id == VCS || engine->id == VCS2);
engine->ctx_desc_template = GEN8_CTX_VALID;
if (IS_GEN8(dev_priv))
engine->ctx_desc_template |= GEN8_CTX_L3LLC_COHERENT;
engine->ctx_desc_template |= GEN8_CTX_PRIVILEGE;
/* TODO: WaDisableLiteRestore when we start using semaphore
* signalling between Command Streamers */
/* ring->ctx_desc_template |= GEN8_CTX_FORCE_RESTORE; */
/* WaEnableForceRestoreInCtxtDescForVCS:skl */
/* WaEnableForceRestoreInCtxtDescForVCS:bxt */
if (engine->disable_lite_restore_wa)
engine->ctx_desc_template |= GEN8_CTX_FORCE_RESTORE;
}
/**
* intel_lr_context_descriptor_update() - calculate & cache the descriptor
* descriptor for a pinned context
*
* @ctx: Context to work on
* @engine: Engine the descriptor will be used with
*
* The context descriptor encodes various attributes of a context,
* including its GTT address and some flags. Because it's fairly
* expensive to calculate, we'll just do it once and cache the result,
* which remains valid until the context is unpinned.
*
* This is what a descriptor looks like, from LSB to MSB:
* bits 0-11: flags, GEN8_CTX_* (cached in ctx_desc_template)
* bits 12-31: LRCA, GTT address of (the HWSP of) this context
* bits 32-52: ctx ID, a globally unique tag
* bits 53-54: mbz, reserved for use by hardware
* bits 55-63: group ID, currently unused and set to 0
*/
static void
intel_lr_context_descriptor_update(struct i915_gem_context *ctx,
struct intel_engine_cs *engine)
{
struct intel_context *ce = &ctx->engine[engine->id];
u64 desc;
BUILD_BUG_ON(MAX_CONTEXT_HW_ID > (1<<GEN8_CTX_ID_WIDTH));
desc = ctx->desc_template; /* bits 3-4 */
desc |= engine->ctx_desc_template; /* bits 0-11 */
desc |= ce->lrc_vma->node.start + LRC_PPHWSP_PN * PAGE_SIZE;
/* bits 12-31 */
desc |= (u64)ctx->hw_id << GEN8_CTX_ID_SHIFT; /* bits 32-52 */
ce->lrc_desc = desc;
}
uint64_t intel_lr_context_descriptor(struct i915_gem_context *ctx,
struct intel_engine_cs *engine)
{
return ctx->engine[engine->id].lrc_desc;
}
static void execlists_elsp_write(struct drm_i915_gem_request *rq0,
struct drm_i915_gem_request *rq1)
{
struct intel_engine_cs *engine = rq0->engine;
struct drm_i915_private *dev_priv = rq0->i915;
uint64_t desc[2];
if (rq1) {
desc[1] = intel_lr_context_descriptor(rq1->ctx, rq1->engine);
rq1->elsp_submitted++;
} else {
desc[1] = 0;
}
desc[0] = intel_lr_context_descriptor(rq0->ctx, rq0->engine);
rq0->elsp_submitted++;
/* You must always write both descriptors in the order below. */
I915_WRITE_FW(RING_ELSP(engine), upper_32_bits(desc[1]));
I915_WRITE_FW(RING_ELSP(engine), lower_32_bits(desc[1]));
I915_WRITE_FW(RING_ELSP(engine), upper_32_bits(desc[0]));
/* The context is automatically loaded after the following */
I915_WRITE_FW(RING_ELSP(engine), lower_32_bits(desc[0]));
/* ELSP is a wo register, use another nearby reg for posting */
POSTING_READ_FW(RING_EXECLIST_STATUS_LO(engine));
}
static void
execlists_update_context_pdps(struct i915_hw_ppgtt *ppgtt, u32 *reg_state)
{
ASSIGN_CTX_PDP(ppgtt, reg_state, 3);
ASSIGN_CTX_PDP(ppgtt, reg_state, 2);
ASSIGN_CTX_PDP(ppgtt, reg_state, 1);
ASSIGN_CTX_PDP(ppgtt, reg_state, 0);
}
static void execlists_update_context(struct drm_i915_gem_request *rq)
{
struct intel_engine_cs *engine = rq->engine;
struct i915_hw_ppgtt *ppgtt = rq->ctx->ppgtt;
uint32_t *reg_state = rq->ctx->engine[engine->id].lrc_reg_state;
reg_state[CTX_RING_TAIL+1] = rq->tail;
/* True 32b PPGTT with dynamic page allocation: update PDP
* registers and point the unallocated PDPs to scratch page.
* PML4 is allocated during ppgtt init, so this is not needed
* in 48-bit mode.
*/
if (ppgtt && !USES_FULL_48BIT_PPGTT(ppgtt->base.dev))
execlists_update_context_pdps(ppgtt, reg_state);
}
static void execlists_submit_requests(struct drm_i915_gem_request *rq0,
struct drm_i915_gem_request *rq1)
{
struct drm_i915_private *dev_priv = rq0->i915;
unsigned int fw_domains = rq0->engine->fw_domains;
execlists_update_context(rq0);
if (rq1)
execlists_update_context(rq1);
spin_lock_irq(&dev_priv->uncore.lock);
intel_uncore_forcewake_get__locked(dev_priv, fw_domains);
execlists_elsp_write(rq0, rq1);
intel_uncore_forcewake_put__locked(dev_priv, fw_domains);
spin_unlock_irq(&dev_priv->uncore.lock);
}
static inline void execlists_context_status_change(
struct drm_i915_gem_request *rq,
unsigned long status)
{
/*
* Only used when GVT-g is enabled now. When GVT-g is disabled,
* The compiler should eliminate this function as dead-code.
*/
if (!IS_ENABLED(CONFIG_DRM_I915_GVT))
return;
atomic_notifier_call_chain(&rq->ctx->status_notifier, status, rq);
}
static void execlists_context_unqueue(struct intel_engine_cs *engine)
{
struct drm_i915_gem_request *req0 = NULL, *req1 = NULL;
struct drm_i915_gem_request *cursor, *tmp;
assert_spin_locked(&engine->execlist_lock);
/*
* If irqs are not active generate a warning as batches that finish
* without the irqs may get lost and a GPU Hang may occur.
*/
WARN_ON(!intel_irqs_enabled(engine->i915));
/* Try to read in pairs */
list_for_each_entry_safe(cursor, tmp, &engine->execlist_queue,
execlist_link) {
if (!req0) {
req0 = cursor;
} else if (req0->ctx == cursor->ctx) {
/* Same ctx: ignore first request, as second request
* will update tail past first request's workload */
cursor->elsp_submitted = req0->elsp_submitted;
list_del(&req0->execlist_link);
i915_gem_request_unreference(req0);
req0 = cursor;
} else {
if (IS_ENABLED(CONFIG_DRM_I915_GVT)) {
/*
* req0 (after merged) ctx requires single
* submission, stop picking
*/
if (req0->ctx->execlists_force_single_submission)
break;
/*
* req0 ctx doesn't require single submission,
* but next req ctx requires, stop picking
*/
if (cursor->ctx->execlists_force_single_submission)
break;
}
req1 = cursor;
WARN_ON(req1->elsp_submitted);
break;
}
}
if (unlikely(!req0))
return;
execlists_context_status_change(req0, INTEL_CONTEXT_SCHEDULE_IN);
if (req1)
execlists_context_status_change(req1,
INTEL_CONTEXT_SCHEDULE_IN);
if (req0->elsp_submitted & engine->idle_lite_restore_wa) {
/*
* WaIdleLiteRestore: make sure we never cause a lite restore
* with HEAD==TAIL.
*
* Apply the wa NOOPS to prevent ring:HEAD == req:TAIL as we
* resubmit the request. See gen8_emit_request() for where we
* prepare the padding after the end of the request.
*/
struct intel_ringbuffer *ringbuf;
ringbuf = req0->ctx->engine[engine->id].ringbuf;
req0->tail += 8;
req0->tail &= ringbuf->size - 1;
}
execlists_submit_requests(req0, req1);
}
static unsigned int
execlists_check_remove_request(struct intel_engine_cs *engine, u32 ctx_id)
{
struct drm_i915_gem_request *head_req;
assert_spin_locked(&engine->execlist_lock);
head_req = list_first_entry_or_null(&engine->execlist_queue,
struct drm_i915_gem_request,
execlist_link);
if (WARN_ON(!head_req || (head_req->ctx_hw_id != ctx_id)))
return 0;
WARN(head_req->elsp_submitted == 0, "Never submitted head request\n");
if (--head_req->elsp_submitted > 0)
return 0;
execlists_context_status_change(head_req, INTEL_CONTEXT_SCHEDULE_OUT);
list_del(&head_req->execlist_link);
i915_gem_request_unreference(head_req);
return 1;
}
static u32
get_context_status(struct intel_engine_cs *engine, unsigned int read_pointer,
u32 *context_id)
{
struct drm_i915_private *dev_priv = engine->i915;
u32 status;
read_pointer %= GEN8_CSB_ENTRIES;
status = I915_READ_FW(RING_CONTEXT_STATUS_BUF_LO(engine, read_pointer));
if (status & GEN8_CTX_STATUS_IDLE_ACTIVE)
return 0;
*context_id = I915_READ_FW(RING_CONTEXT_STATUS_BUF_HI(engine,
read_pointer));
return status;
}
/**
* intel_lrc_irq_handler() - handle Context Switch interrupts
* @data: tasklet handler passed in unsigned long
*
* Check the unread Context Status Buffers and manage the submission of new
* contexts to the ELSP accordingly.
*/
static void intel_lrc_irq_handler(unsigned long data)
{
struct intel_engine_cs *engine = (struct intel_engine_cs *)data;
struct drm_i915_private *dev_priv = engine->i915;
u32 status_pointer;
unsigned int read_pointer, write_pointer;
u32 csb[GEN8_CSB_ENTRIES][2];
unsigned int csb_read = 0, i;
unsigned int submit_contexts = 0;
intel_uncore_forcewake_get(dev_priv, engine->fw_domains);
status_pointer = I915_READ_FW(RING_CONTEXT_STATUS_PTR(engine));
read_pointer = engine->next_context_status_buffer;
write_pointer = GEN8_CSB_WRITE_PTR(status_pointer);
if (read_pointer > write_pointer)
write_pointer += GEN8_CSB_ENTRIES;
while (read_pointer < write_pointer) {
if (WARN_ON_ONCE(csb_read == GEN8_CSB_ENTRIES))
break;
csb[csb_read][0] = get_context_status(engine, ++read_pointer,
&csb[csb_read][1]);
csb_read++;
}
engine->next_context_status_buffer = write_pointer % GEN8_CSB_ENTRIES;
/* Update the read pointer to the old write pointer. Manual ringbuffer
* management ftw </sarcasm> */
I915_WRITE_FW(RING_CONTEXT_STATUS_PTR(engine),
_MASKED_FIELD(GEN8_CSB_READ_PTR_MASK,
engine->next_context_status_buffer << 8));
intel_uncore_forcewake_put(dev_priv, engine->fw_domains);
spin_lock(&engine->execlist_lock);
for (i = 0; i < csb_read; i++) {
if (unlikely(csb[i][0] & GEN8_CTX_STATUS_PREEMPTED)) {
if (csb[i][0] & GEN8_CTX_STATUS_LITE_RESTORE) {
if (execlists_check_remove_request(engine, csb[i][1]))
WARN(1, "Lite Restored request removed from queue\n");
} else
WARN(1, "Preemption without Lite Restore\n");
}
if (csb[i][0] & (GEN8_CTX_STATUS_ACTIVE_IDLE |
GEN8_CTX_STATUS_ELEMENT_SWITCH))
submit_contexts +=
execlists_check_remove_request(engine, csb[i][1]);
}
if (submit_contexts) {
if (!engine->disable_lite_restore_wa ||
(csb[i][0] & GEN8_CTX_STATUS_ACTIVE_IDLE))
execlists_context_unqueue(engine);
}
spin_unlock(&engine->execlist_lock);
if (unlikely(submit_contexts > 2))
DRM_ERROR("More than two context complete events?\n");
}
static void execlists_context_queue(struct drm_i915_gem_request *request)
{
struct intel_engine_cs *engine = request->engine;
struct drm_i915_gem_request *cursor;
int num_elements = 0;
spin_lock_bh(&engine->execlist_lock);
list_for_each_entry(cursor, &engine->execlist_queue, execlist_link)
if (++num_elements > 2)
break;
if (num_elements > 2) {
struct drm_i915_gem_request *tail_req;
tail_req = list_last_entry(&engine->execlist_queue,
struct drm_i915_gem_request,
execlist_link);
if (request->ctx == tail_req->ctx) {
WARN(tail_req->elsp_submitted != 0,
"More than 2 already-submitted reqs queued\n");
list_del(&tail_req->execlist_link);
i915_gem_request_unreference(tail_req);
}
}
i915_gem_request_reference(request);
list_add_tail(&request->execlist_link, &engine->execlist_queue);
request->ctx_hw_id = request->ctx->hw_id;
if (num_elements == 0)
execlists_context_unqueue(engine);
spin_unlock_bh(&engine->execlist_lock);
}
static int logical_ring_invalidate_all_caches(struct drm_i915_gem_request *req)
{
struct intel_engine_cs *engine = req->engine;
uint32_t flush_domains;
int ret;
flush_domains = 0;
if (engine->gpu_caches_dirty)
flush_domains = I915_GEM_GPU_DOMAINS;
ret = engine->emit_flush(req, I915_GEM_GPU_DOMAINS, flush_domains);
if (ret)
return ret;
engine->gpu_caches_dirty = false;
return 0;
}
static int execlists_move_to_gpu(struct drm_i915_gem_request *req,
struct list_head *vmas)
{
const unsigned other_rings = ~intel_engine_flag(req->engine);
struct i915_vma *vma;
uint32_t flush_domains = 0;
bool flush_chipset = false;
int ret;
list_for_each_entry(vma, vmas, exec_list) {
struct drm_i915_gem_object *obj = vma->obj;
if (obj->active & other_rings) {
ret = i915_gem_object_sync(obj, req->engine, &req);
if (ret)
return ret;
}
if (obj->base.write_domain & I915_GEM_DOMAIN_CPU)
flush_chipset |= i915_gem_clflush_object(obj, false);
flush_domains |= obj->base.write_domain;
}
if (flush_domains & I915_GEM_DOMAIN_GTT)
wmb();
/* Unconditionally invalidate gpu caches and ensure that we do flush
* any residual writes from the previous batch.
*/
return logical_ring_invalidate_all_caches(req);
}
int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request)
{
struct intel_engine_cs *engine = request->engine;
struct intel_context *ce = &request->ctx->engine[engine->id];
int ret;
/* Flush enough space to reduce the likelihood of waiting after
* we start building the request - in which case we will just
* have to repeat work.
*/
request->reserved_space += EXECLISTS_REQUEST_SIZE;
if (!ce->state) {
ret = execlists_context_deferred_alloc(request->ctx, engine);
if (ret)
return ret;
}
request->ringbuf = ce->ringbuf;
if (i915.enable_guc_submission) {
/*
* Check that the GuC has space for the request before
* going any further, as the i915_add_request() call
* later on mustn't fail ...
*/
ret = i915_guc_wq_check_space(request);
if (ret)
return ret;
}
ret = intel_lr_context_pin(request->ctx, engine);
if (ret)
return ret;
ret = intel_ring_begin(request, 0);
if (ret)
goto err_unpin;
if (!ce->initialised) {
ret = engine->init_context(request);
if (ret)
goto err_unpin;
ce->initialised = true;
}
/* Note that after this point, we have committed to using
* this request as it is being used to both track the
* state of engine initialisation and liveness of the
* golden renderstate above. Think twice before you try
* to cancel/unwind this request now.
*/
request->reserved_space -= EXECLISTS_REQUEST_SIZE;
return 0;
err_unpin:
intel_lr_context_unpin(request->ctx, engine);
return ret;
}
/*
* intel_logical_ring_advance_and_submit() - advance the tail and submit the workload
* @request: Request to advance the logical ringbuffer of.
*
* The tail is updated in our logical ringbuffer struct, not in the actual context. What
* really happens during submission is that the context and current tail will be placed
* on a queue waiting for the ELSP to be ready to accept a new context submission. At that
* point, the tail *inside* the context is updated and the ELSP written to.
*/
static int
intel_logical_ring_advance_and_submit(struct drm_i915_gem_request *request)
{
struct intel_ringbuffer *ringbuf = request->ringbuf;
struct intel_engine_cs *engine = request->engine;
intel_logical_ring_advance(ringbuf);
request->tail = ringbuf->tail;
/*
* Here we add two extra NOOPs as padding to avoid
* lite restore of a context with HEAD==TAIL.
*
* Caller must reserve WA_TAIL_DWORDS for us!
*/
intel_logical_ring_emit(ringbuf, MI_NOOP);
intel_logical_ring_emit(ringbuf, MI_NOOP);
intel_logical_ring_advance(ringbuf);
if (intel_engine_stopped(engine))
return 0;
/* We keep the previous context alive until we retire the following
* request. This ensures that any the context object is still pinned
* for any residual writes the HW makes into it on the context switch
* into the next object following the breadcrumb. Otherwise, we may
* retire the context too early.
*/
request->previous_context = engine->last_context;
engine->last_context = request->ctx;
if (i915.enable_guc_submission)
i915_guc_submit(request);
else
execlists_context_queue(request);
return 0;
}
/**
* execlists_submission() - submit a batchbuffer for execution, Execlists style
* @params: execbuffer call parameters.
* @args: execbuffer call arguments.
* @vmas: list of vmas.
*
* This is the evil twin version of i915_gem_ringbuffer_submission. It abstracts
* away the submission details of the execbuffer ioctl call.
*
* Return: non-zero if the submission fails.
*/
int intel_execlists_submission(struct i915_execbuffer_params *params,
struct drm_i915_gem_execbuffer2 *args,
struct list_head *vmas)
{
struct drm_device *dev = params->dev;
struct intel_engine_cs *engine = params->engine;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_ringbuffer *ringbuf = params->ctx->engine[engine->id].ringbuf;
u64 exec_start;
int instp_mode;
u32 instp_mask;
int ret;
instp_mode = args->flags & I915_EXEC_CONSTANTS_MASK;
instp_mask = I915_EXEC_CONSTANTS_MASK;
switch (instp_mode) {
case I915_EXEC_CONSTANTS_REL_GENERAL:
case I915_EXEC_CONSTANTS_ABSOLUTE:
case I915_EXEC_CONSTANTS_REL_SURFACE:
if (instp_mode != 0 && engine != &dev_priv->engine[RCS]) {
DRM_DEBUG("non-0 rel constants mode on non-RCS\n");
return -EINVAL;
}
if (instp_mode != dev_priv->relative_constants_mode) {
if (instp_mode == I915_EXEC_CONSTANTS_REL_SURFACE) {
DRM_DEBUG("rel surface constants mode invalid on gen5+\n");
return -EINVAL;
}
/* The HW changed the meaning on this bit on gen6 */
instp_mask &= ~I915_EXEC_CONSTANTS_REL_SURFACE;
}
break;
default:
DRM_DEBUG("execbuf with unknown constants: %d\n", instp_mode);
return -EINVAL;
}
if (args->flags & I915_EXEC_GEN7_SOL_RESET) {
DRM_DEBUG("sol reset is gen7 only\n");
return -EINVAL;
}
ret = execlists_move_to_gpu(params->request, vmas);
if (ret)
return ret;
if (engine == &dev_priv->engine[RCS] &&
instp_mode != dev_priv->relative_constants_mode) {
ret = intel_ring_begin(params->request, 4);
if (ret)
return ret;
intel_logical_ring_emit(ringbuf, MI_NOOP);
intel_logical_ring_emit(ringbuf, MI_LOAD_REGISTER_IMM(1));
intel_logical_ring_emit_reg(ringbuf, INSTPM);
intel_logical_ring_emit(ringbuf, instp_mask << 16 | instp_mode);
intel_logical_ring_advance(ringbuf);
dev_priv->relative_constants_mode = instp_mode;
}
exec_start = params->batch_obj_vm_offset +
args->batch_start_offset;
ret = engine->emit_bb_start(params->request, exec_start, params->dispatch_flags);
if (ret)
return ret;
trace_i915_gem_ring_dispatch(params->request, params->dispatch_flags);
i915_gem_execbuffer_move_to_active(vmas, params->request);
return 0;
}
void intel_execlists_cancel_requests(struct intel_engine_cs *engine)
{
struct drm_i915_gem_request *req, *tmp;
LIST_HEAD(cancel_list);
WARN_ON(!mutex_is_locked(&engine->i915->dev->struct_mutex));
spin_lock_bh(&engine->execlist_lock);
list_replace_init(&engine->execlist_queue, &cancel_list);
spin_unlock_bh(&engine->execlist_lock);
list_for_each_entry_safe(req, tmp, &cancel_list, execlist_link) {
list_del(&req->execlist_link);
i915_gem_request_unreference(req);
}
}
void intel_logical_ring_stop(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
int ret;
if (!intel_engine_initialized(engine))
return;
ret = intel_engine_idle(engine);
if (ret)
DRM_ERROR("failed to quiesce %s whilst cleaning up: %d\n",
engine->name, ret);
/* TODO: Is this correct with Execlists enabled? */
I915_WRITE_MODE(engine, _MASKED_BIT_ENABLE(STOP_RING));
if (wait_for((I915_READ_MODE(engine) & MODE_IDLE) != 0, 1000)) {
DRM_ERROR("%s :timed out trying to stop ring\n", engine->name);
return;
}
I915_WRITE_MODE(engine, _MASKED_BIT_DISABLE(STOP_RING));
}
int logical_ring_flush_all_caches(struct drm_i915_gem_request *req)
{
struct intel_engine_cs *engine = req->engine;
int ret;
if (!engine->gpu_caches_dirty)
return 0;
ret = engine->emit_flush(req, 0, I915_GEM_GPU_DOMAINS);
if (ret)
return ret;
engine->gpu_caches_dirty = false;
return 0;
}
static int intel_lr_context_pin(struct i915_gem_context *ctx,
struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = ctx->i915;
struct intel_context *ce = &ctx->engine[engine->id];
void *vaddr;
u32 *lrc_reg_state;
int ret;
lockdep_assert_held(&ctx->i915->dev->struct_mutex);
if (ce->pin_count++)
return 0;
ret = i915_gem_obj_ggtt_pin(ce->state, GEN8_LR_CONTEXT_ALIGN,
PIN_OFFSET_BIAS | GUC_WOPCM_TOP);
if (ret)
goto err;
vaddr = i915_gem_object_pin_map(ce->state);
if (IS_ERR(vaddr)) {
ret = PTR_ERR(vaddr);
goto unpin_ctx_obj;
}
lrc_reg_state = vaddr + LRC_STATE_PN * PAGE_SIZE;
ret = intel_pin_and_map_ringbuffer_obj(dev_priv, ce->ringbuf);
if (ret)
goto unpin_map;
i915_gem_context_reference(ctx);
ce->lrc_vma = i915_gem_obj_to_ggtt(ce->state);
intel_lr_context_descriptor_update(ctx, engine);
lrc_reg_state[CTX_RING_BUFFER_START+1] = ce->ringbuf->vma->node.start;
ce->lrc_reg_state = lrc_reg_state;
ce->state->dirty = true;
/* Invalidate GuC TLB. */
if (i915.enable_guc_submission)
I915_WRITE(GEN8_GTCR, GEN8_GTCR_INVALIDATE);
return 0;
unpin_map:
i915_gem_object_unpin_map(ce->state);
unpin_ctx_obj:
i915_gem_object_ggtt_unpin(ce->state);
err:
ce->pin_count = 0;
return ret;
}
void intel_lr_context_unpin(struct i915_gem_context *ctx,
struct intel_engine_cs *engine)
{
struct intel_context *ce = &ctx->engine[engine->id];
lockdep_assert_held(&ctx->i915->dev->struct_mutex);
GEM_BUG_ON(ce->pin_count == 0);
if (--ce->pin_count)
return;
intel_unpin_ringbuffer_obj(ce->ringbuf);
i915_gem_object_unpin_map(ce->state);
i915_gem_object_ggtt_unpin(ce->state);
ce->lrc_vma = NULL;
ce->lrc_desc = 0;
ce->lrc_reg_state = NULL;
i915_gem_context_unreference(ctx);
}
static int intel_logical_ring_workarounds_emit(struct drm_i915_gem_request *req)
{
int ret, i;
struct intel_engine_cs *engine = req->engine;
struct intel_ringbuffer *ringbuf = req->ringbuf;
struct i915_workarounds *w = &req->i915->workarounds;
if (w->count == 0)
return 0;
engine->gpu_caches_dirty = true;
ret = logical_ring_flush_all_caches(req);
if (ret)
return ret;
ret = intel_ring_begin(req, w->count * 2 + 2);
if (ret)
return ret;
intel_logical_ring_emit(ringbuf, MI_LOAD_REGISTER_IMM(w->count));
for (i = 0; i < w->count; i++) {
intel_logical_ring_emit_reg(ringbuf, w->reg[i].addr);
intel_logical_ring_emit(ringbuf, w->reg[i].value);
}
intel_logical_ring_emit(ringbuf, MI_NOOP);
intel_logical_ring_advance(ringbuf);
engine->gpu_caches_dirty = true;
ret = logical_ring_flush_all_caches(req);
if (ret)
return ret;
return 0;
}
#define wa_ctx_emit(batch, index, cmd) \
do { \
int __index = (index)++; \
if (WARN_ON(__index >= (PAGE_SIZE / sizeof(uint32_t)))) { \
return -ENOSPC; \
} \
batch[__index] = (cmd); \
} while (0)
#define wa_ctx_emit_reg(batch, index, reg) \
wa_ctx_emit((batch), (index), i915_mmio_reg_offset(reg))
/*
* In this WA we need to set GEN8_L3SQCREG4[21:21] and reset it after
* PIPE_CONTROL instruction. This is required for the flush to happen correctly
* but there is a slight complication as this is applied in WA batch where the
* values are only initialized once so we cannot take register value at the
* beginning and reuse it further; hence we save its value to memory, upload a
* constant value with bit21 set and then we restore it back with the saved value.
* To simplify the WA, a constant value is formed by using the default value
* of this register. This shouldn't be a problem because we are only modifying
* it for a short period and this batch in non-premptible. We can ofcourse
* use additional instructions that read the actual value of the register
* at that time and set our bit of interest but it makes the WA complicated.
*
* This WA is also required for Gen9 so extracting as a function avoids
* code duplication.
*/
static inline int gen8_emit_flush_coherentl3_wa(struct intel_engine_cs *engine,
uint32_t *const batch,
uint32_t index)
{
uint32_t l3sqc4_flush = (0x40400000 | GEN8_LQSC_FLUSH_COHERENT_LINES);
/*
* WaDisableLSQCROPERFforOCL:skl,kbl
* This WA is implemented in skl_init_clock_gating() but since
* this batch updates GEN8_L3SQCREG4 with default value we need to
* set this bit here to retain the WA during flush.
*/
if (IS_SKL_REVID(engine->i915, 0, SKL_REVID_E0) ||
IS_KBL_REVID(engine->i915, 0, KBL_REVID_E0))
l3sqc4_flush |= GEN8_LQSC_RO_PERF_DIS;
wa_ctx_emit(batch, index, (MI_STORE_REGISTER_MEM_GEN8 |
MI_SRM_LRM_GLOBAL_GTT));
wa_ctx_emit_reg(batch, index, GEN8_L3SQCREG4);
wa_ctx_emit(batch, index, engine->scratch.gtt_offset + 256);
wa_ctx_emit(batch, index, 0);
wa_ctx_emit(batch, index, MI_LOAD_REGISTER_IMM(1));
wa_ctx_emit_reg(batch, index, GEN8_L3SQCREG4);
wa_ctx_emit(batch, index, l3sqc4_flush);
wa_ctx_emit(batch, index, GFX_OP_PIPE_CONTROL(6));
wa_ctx_emit(batch, index, (PIPE_CONTROL_CS_STALL |
PIPE_CONTROL_DC_FLUSH_ENABLE));
wa_ctx_emit(batch, index, 0);
wa_ctx_emit(batch, index, 0);
wa_ctx_emit(batch, index, 0);
wa_ctx_emit(batch, index, 0);
wa_ctx_emit(batch, index, (MI_LOAD_REGISTER_MEM_GEN8 |
MI_SRM_LRM_GLOBAL_GTT));
wa_ctx_emit_reg(batch, index, GEN8_L3SQCREG4);
wa_ctx_emit(batch, index, engine->scratch.gtt_offset + 256);
wa_ctx_emit(batch, index, 0);
return index;
}
static inline uint32_t wa_ctx_start(struct i915_wa_ctx_bb *wa_ctx,
uint32_t offset,
uint32_t start_alignment)
{
return wa_ctx->offset = ALIGN(offset, start_alignment);
}
static inline int wa_ctx_end(struct i915_wa_ctx_bb *wa_ctx,
uint32_t offset,
uint32_t size_alignment)
{
wa_ctx->size = offset - wa_ctx->offset;
WARN(wa_ctx->size % size_alignment,
"wa_ctx_bb failed sanity checks: size %d is not aligned to %d\n",
wa_ctx->size, size_alignment);
return 0;
}
/**
* gen8_init_indirectctx_bb() - initialize indirect ctx batch with WA
*
* @engine: only applicable for RCS
* @wa_ctx: structure representing wa_ctx
* offset: specifies start of the batch, should be cache-aligned. This is updated
* with the offset value received as input.
* size: size of the batch in DWORDS but HW expects in terms of cachelines
* @batch: page in which WA are loaded
* @offset: This field specifies the start of the batch, it should be
* cache-aligned otherwise it is adjusted accordingly.
* Typically we only have one indirect_ctx and per_ctx batch buffer which are
* initialized at the beginning and shared across all contexts but this field
* helps us to have multiple batches at different offsets and select them based
* on a criteria. At the moment this batch always start at the beginning of the page
* and at this point we don't have multiple wa_ctx batch buffers.
*
* The number of WA applied are not known at the beginning; we use this field
* to return the no of DWORDS written.
*
* It is to be noted that this batch does not contain MI_BATCH_BUFFER_END
* so it adds NOOPs as padding to make it cacheline aligned.
* MI_BATCH_BUFFER_END will be added to perctx batch and both of them together
* makes a complete batch buffer.
*
* Return: non-zero if we exceed the PAGE_SIZE limit.
*/
static int gen8_init_indirectctx_bb(struct intel_engine_cs *engine,
struct i915_wa_ctx_bb *wa_ctx,
uint32_t *const batch,
uint32_t *offset)
{
uint32_t scratch_addr;
uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);
/* WaDisableCtxRestoreArbitration:bdw,chv */
wa_ctx_emit(batch, index, MI_ARB_ON_OFF | MI_ARB_DISABLE);
/* WaFlushCoherentL3CacheLinesAtContextSwitch:bdw */
if (IS_BROADWELL(engine->i915)) {
int rc = gen8_emit_flush_coherentl3_wa(engine, batch, index);
if (rc < 0)
return rc;
index = rc;
}
/* WaClearSlmSpaceAtContextSwitch:bdw,chv */
/* Actual scratch location is at 128 bytes offset */
scratch_addr = engine->scratch.gtt_offset + 2*CACHELINE_BYTES;
wa_ctx_emit(batch, index, GFX_OP_PIPE_CONTROL(6));
wa_ctx_emit(batch, index, (PIPE_CONTROL_FLUSH_L3 |
PIPE_CONTROL_GLOBAL_GTT_IVB |
PIPE_CONTROL_CS_STALL |
PIPE_CONTROL_QW_WRITE));
wa_ctx_emit(batch, index, scratch_addr);
wa_ctx_emit(batch, index, 0);
wa_ctx_emit(batch, index, 0);
wa_ctx_emit(batch, index, 0);
/* Pad to end of cacheline */
while (index % CACHELINE_DWORDS)
wa_ctx_emit(batch, index, MI_NOOP);
/*
* MI_BATCH_BUFFER_END is not required in Indirect ctx BB because
* execution depends on the length specified in terms of cache lines
* in the register CTX_RCS_INDIRECT_CTX
*/
return wa_ctx_end(wa_ctx, *offset = index, CACHELINE_DWORDS);
}
/**
* gen8_init_perctx_bb() - initialize per ctx batch with WA
*
* @engine: only applicable for RCS
* @wa_ctx: structure representing wa_ctx
* offset: specifies start of the batch, should be cache-aligned.
* size: size of the batch in DWORDS but HW expects in terms of cachelines
* @batch: page in which WA are loaded
* @offset: This field specifies the start of this batch.
* This batch is started immediately after indirect_ctx batch. Since we ensure
* that indirect_ctx ends on a cacheline this batch is aligned automatically.
*
* The number of DWORDS written are returned using this field.
*
* This batch is terminated with MI_BATCH_BUFFER_END and so we need not add padding
* to align it with cacheline as padding after MI_BATCH_BUFFER_END is redundant.
*/
static int gen8_init_perctx_bb(struct intel_engine_cs *engine,
struct i915_wa_ctx_bb *wa_ctx,
uint32_t *const batch,
uint32_t *offset)
{
uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);
/* WaDisableCtxRestoreArbitration:bdw,chv */
wa_ctx_emit(batch, index, MI_ARB_ON_OFF | MI_ARB_ENABLE);
wa_ctx_emit(batch, index, MI_BATCH_BUFFER_END);
return wa_ctx_end(wa_ctx, *offset = index, 1);
}
static int gen9_init_indirectctx_bb(struct intel_engine_cs *engine,
struct i915_wa_ctx_bb *wa_ctx,
uint32_t *const batch,
uint32_t *offset)
{
int ret;
uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);
/* WaDisableCtxRestoreArbitration:skl,bxt */
if (IS_SKL_REVID(engine->i915, 0, SKL_REVID_D0) ||
IS_BXT_REVID(engine->i915, 0, BXT_REVID_A1))
wa_ctx_emit(batch, index, MI_ARB_ON_OFF | MI_ARB_DISABLE);
/* WaFlushCoherentL3CacheLinesAtContextSwitch:skl,bxt */
ret = gen8_emit_flush_coherentl3_wa(engine, batch, index);
if (ret < 0)
return ret;
index = ret;
/* WaClearSlmSpaceAtContextSwitch:kbl */
/* Actual scratch location is at 128 bytes offset */
if (IS_KBL_REVID(engine->i915, 0, KBL_REVID_A0)) {
uint32_t scratch_addr
= engine->scratch.gtt_offset + 2*CACHELINE_BYTES;
wa_ctx_emit(batch, index, GFX_OP_PIPE_CONTROL(6));
wa_ctx_emit(batch, index, (PIPE_CONTROL_FLUSH_L3 |
PIPE_CONTROL_GLOBAL_GTT_IVB |
PIPE_CONTROL_CS_STALL |
PIPE_CONTROL_QW_WRITE));
wa_ctx_emit(batch, index, scratch_addr);
wa_ctx_emit(batch, index, 0);
wa_ctx_emit(batch, index, 0);
wa_ctx_emit(batch, index, 0);
}
/* Pad to end of cacheline */
while (index % CACHELINE_DWORDS)
wa_ctx_emit(batch, index, MI_NOOP);
return wa_ctx_end(wa_ctx, *offset = index, CACHELINE_DWORDS);
}
static int gen9_init_perctx_bb(struct intel_engine_cs *engine,
struct i915_wa_ctx_bb *wa_ctx,
uint32_t *const batch,
uint32_t *offset)
{
uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);
/* WaSetDisablePixMaskCammingAndRhwoInCommonSliceChicken:skl,bxt */
if (IS_SKL_REVID(engine->i915, 0, SKL_REVID_B0) ||
IS_BXT_REVID(engine->i915, 0, BXT_REVID_A1)) {
wa_ctx_emit(batch, index, MI_LOAD_REGISTER_IMM(1));
wa_ctx_emit_reg(batch, index, GEN9_SLICE_COMMON_ECO_CHICKEN0);
wa_ctx_emit(batch, index,
_MASKED_BIT_ENABLE(DISABLE_PIXEL_MASK_CAMMING));
wa_ctx_emit(batch, index, MI_NOOP);
}
/* WaClearTdlStateAckDirtyBits:bxt */
if (IS_BXT_REVID(engine->i915, 0, BXT_REVID_B0)) {
wa_ctx_emit(batch, index, MI_LOAD_REGISTER_IMM(4));
wa_ctx_emit_reg(batch, index, GEN8_STATE_ACK);
wa_ctx_emit(batch, index, _MASKED_BIT_DISABLE(GEN9_SUBSLICE_TDL_ACK_BITS));
wa_ctx_emit_reg(batch, index, GEN9_STATE_ACK_SLICE1);
wa_ctx_emit(batch, index, _MASKED_BIT_DISABLE(GEN9_SUBSLICE_TDL_ACK_BITS));
wa_ctx_emit_reg(batch, index, GEN9_STATE_ACK_SLICE2);
wa_ctx_emit(batch, index, _MASKED_BIT_DISABLE(GEN9_SUBSLICE_TDL_ACK_BITS));
wa_ctx_emit_reg(batch, index, GEN7_ROW_CHICKEN2);
/* dummy write to CS, mask bits are 0 to ensure the register is not modified */
wa_ctx_emit(batch, index, 0x0);
wa_ctx_emit(batch, index, MI_NOOP);
}
/* WaDisableCtxRestoreArbitration:skl,bxt */
if (IS_SKL_REVID(engine->i915, 0, SKL_REVID_D0) ||
IS_BXT_REVID(engine->i915, 0, BXT_REVID_A1))
wa_ctx_emit(batch, index, MI_ARB_ON_OFF | MI_ARB_ENABLE);
wa_ctx_emit(batch, index, MI_BATCH_BUFFER_END);
return wa_ctx_end(wa_ctx, *offset = index, 1);
}
static int lrc_setup_wa_ctx_obj(struct intel_engine_cs *engine, u32 size)
{
int ret;
engine->wa_ctx.obj = i915_gem_object_create(engine->i915->dev,
PAGE_ALIGN(size));
if (IS_ERR(engine->wa_ctx.obj)) {
DRM_DEBUG_DRIVER("alloc LRC WA ctx backing obj failed.\n");
ret = PTR_ERR(engine->wa_ctx.obj);
engine->wa_ctx.obj = NULL;
return ret;
}
ret = i915_gem_obj_ggtt_pin(engine->wa_ctx.obj, PAGE_SIZE, 0);
if (ret) {
DRM_DEBUG_DRIVER("pin LRC WA ctx backing obj failed: %d\n",
ret);
drm_gem_object_unreference(&engine->wa_ctx.obj->base);
return ret;
}
return 0;
}
static void lrc_destroy_wa_ctx_obj(struct intel_engine_cs *engine)
{
if (engine->wa_ctx.obj) {
i915_gem_object_ggtt_unpin(engine->wa_ctx.obj);
drm_gem_object_unreference(&engine->wa_ctx.obj->base);
engine->wa_ctx.obj = NULL;
}
}
static int intel_init_workaround_bb(struct intel_engine_cs *engine)
{
int ret;
uint32_t *batch;
uint32_t offset;
struct page *page;
struct i915_ctx_workarounds *wa_ctx = &engine->wa_ctx;
WARN_ON(engine->id != RCS);
/* update this when WA for higher Gen are added */
if (INTEL_GEN(engine->i915) > 9) {
DRM_ERROR("WA batch buffer is not initialized for Gen%d\n",
INTEL_GEN(engine->i915));
return 0;
}
/* some WA perform writes to scratch page, ensure it is valid */
if (engine->scratch.obj == NULL) {
DRM_ERROR("scratch page not allocated for %s\n", engine->name);
return -EINVAL;
}
ret = lrc_setup_wa_ctx_obj(engine, PAGE_SIZE);
if (ret) {
DRM_DEBUG_DRIVER("Failed to setup context WA page: %d\n", ret);
return ret;
}
page = i915_gem_object_get_dirty_page(wa_ctx->obj, 0);
batch = kmap_atomic(page);
offset = 0;
if (IS_GEN8(engine->i915)) {
ret = gen8_init_indirectctx_bb(engine,
&wa_ctx->indirect_ctx,
batch,
&offset);
if (ret)
goto out;
ret = gen8_init_perctx_bb(engine,
&wa_ctx->per_ctx,
batch,
&offset);
if (ret)
goto out;
} else if (IS_GEN9(engine->i915)) {
ret = gen9_init_indirectctx_bb(engine,
&wa_ctx->indirect_ctx,
batch,
&offset);
if (ret)
goto out;
ret = gen9_init_perctx_bb(engine,
&wa_ctx->per_ctx,
batch,
&offset);
if (ret)
goto out;
}
out:
kunmap_atomic(batch);
if (ret)
lrc_destroy_wa_ctx_obj(engine);
return ret;
}
static void lrc_init_hws(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
I915_WRITE(RING_HWS_PGA(engine->mmio_base),
(u32)engine->status_page.gfx_addr);
POSTING_READ(RING_HWS_PGA(engine->mmio_base));
}
static int gen8_init_common_ring(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
unsigned int next_context_status_buffer_hw;
lrc_init_hws(engine);
I915_WRITE_IMR(engine,
~(engine->irq_enable_mask | engine->irq_keep_mask));
I915_WRITE(RING_HWSTAM(engine->mmio_base), 0xffffffff);
I915_WRITE(RING_MODE_GEN7(engine),
_MASKED_BIT_DISABLE(GFX_REPLAY_MODE) |
_MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE));
POSTING_READ(RING_MODE_GEN7(engine));
/*
* Instead of resetting the Context Status Buffer (CSB) read pointer to
* zero, we need to read the write pointer from hardware and use its
* value because "this register is power context save restored".
* Effectively, these states have been observed:
*
* | Suspend-to-idle (freeze) | Suspend-to-RAM (mem) |
* BDW | CSB regs not reset | CSB regs reset |
* CHT | CSB regs not reset | CSB regs not reset |
* SKL | ? | ? |
* BXT | ? | ? |
*/
next_context_status_buffer_hw =
GEN8_CSB_WRITE_PTR(I915_READ(RING_CONTEXT_STATUS_PTR(engine)));
/*
* When the CSB registers are reset (also after power-up / gpu reset),
* CSB write pointer is set to all 1's, which is not valid, use '5' in
* this special case, so the first element read is CSB[0].
*/
if (next_context_status_buffer_hw == GEN8_CSB_PTR_MASK)
next_context_status_buffer_hw = (GEN8_CSB_ENTRIES - 1);
engine->next_context_status_buffer = next_context_status_buffer_hw;
DRM_DEBUG_DRIVER("Execlists enabled for %s\n", engine->name);
intel_engine_init_hangcheck(engine);
return intel_mocs_init_engine(engine);
}
static int gen8_init_render_ring(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
int ret;
ret = gen8_init_common_ring(engine);
if (ret)
return ret;
/* We need to disable the AsyncFlip performance optimisations in order
* to use MI_WAIT_FOR_EVENT within the CS. It should already be
* programmed to '1' on all products.
*
* WaDisableAsyncFlipPerfMode:snb,ivb,hsw,vlv,bdw,chv
*/
I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE));
I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_FORCE_ORDERING));
return init_workarounds_ring(engine);
}
static int gen9_init_render_ring(struct intel_engine_cs *engine)
{
int ret;
ret = gen8_init_common_ring(engine);
if (ret)
return ret;
return init_workarounds_ring(engine);
}
static int intel_logical_ring_emit_pdps(struct drm_i915_gem_request *req)
{
struct i915_hw_ppgtt *ppgtt = req->ctx->ppgtt;
struct intel_engine_cs *engine = req->engine;
struct intel_ringbuffer *ringbuf = req->ringbuf;
const int num_lri_cmds = GEN8_LEGACY_PDPES * 2;
int i, ret;
ret = intel_ring_begin(req, num_lri_cmds * 2 + 2);
if (ret)
return ret;
intel_logical_ring_emit(ringbuf, MI_LOAD_REGISTER_IMM(num_lri_cmds));
for (i = GEN8_LEGACY_PDPES - 1; i >= 0; i--) {
const dma_addr_t pd_daddr = i915_page_dir_dma_addr(ppgtt, i);
intel_logical_ring_emit_reg(ringbuf,
GEN8_RING_PDP_UDW(engine, i));
intel_logical_ring_emit(ringbuf, upper_32_bits(pd_daddr));
intel_logical_ring_emit_reg(ringbuf,
GEN8_RING_PDP_LDW(engine, i));
intel_logical_ring_emit(ringbuf, lower_32_bits(pd_daddr));
}
intel_logical_ring_emit(ringbuf, MI_NOOP);
intel_logical_ring_advance(ringbuf);
return 0;
}
static int gen8_emit_bb_start(struct drm_i915_gem_request *req,
u64 offset, unsigned dispatch_flags)
{
struct intel_ringbuffer *ringbuf = req->ringbuf;
bool ppgtt = !(dispatch_flags & I915_DISPATCH_SECURE);
int ret;
/* Don't rely in hw updating PDPs, specially in lite-restore.
* Ideally, we should set Force PD Restore in ctx descriptor,
* but we can't. Force Restore would be a second option, but
* it is unsafe in case of lite-restore (because the ctx is
* not idle). PML4 is allocated during ppgtt init so this is
* not needed in 48-bit.*/
if (req->ctx->ppgtt &&
(intel_engine_flag(req->engine) & req->ctx->ppgtt->pd_dirty_rings)) {
if (!USES_FULL_48BIT_PPGTT(req->i915) &&
!intel_vgpu_active(req->i915)) {
ret = intel_logical_ring_emit_pdps(req);
if (ret)
return ret;
}
req->ctx->ppgtt->pd_dirty_rings &= ~intel_engine_flag(req->engine);
}
ret = intel_ring_begin(req, 4);
if (ret)
return ret;
/* FIXME(BDW): Address space and security selectors. */
intel_logical_ring_emit(ringbuf, MI_BATCH_BUFFER_START_GEN8 |
(ppgtt<<8) |
(dispatch_flags & I915_DISPATCH_RS ?
MI_BATCH_RESOURCE_STREAMER : 0));
intel_logical_ring_emit(ringbuf, lower_32_bits(offset));
intel_logical_ring_emit(ringbuf, upper_32_bits(offset));
intel_logical_ring_emit(ringbuf, MI_NOOP);
intel_logical_ring_advance(ringbuf);
return 0;
}
static bool gen8_logical_ring_get_irq(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
unsigned long flags;
if (WARN_ON(!intel_irqs_enabled(dev_priv)))
return false;
spin_lock_irqsave(&dev_priv->irq_lock, flags);
if (engine->irq_refcount++ == 0) {
I915_WRITE_IMR(engine,
~(engine->irq_enable_mask | engine->irq_keep_mask));
POSTING_READ(RING_IMR(engine->mmio_base));
}
spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
return true;
}
static void gen8_logical_ring_put_irq(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
unsigned long flags;
spin_lock_irqsave(&dev_priv->irq_lock, flags);
if (--engine->irq_refcount == 0) {
I915_WRITE_IMR(engine, ~engine->irq_keep_mask);
POSTING_READ(RING_IMR(engine->mmio_base));
}
spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
}
static int gen8_emit_flush(struct drm_i915_gem_request *request,
u32 invalidate_domains,
u32 unused)
{
struct intel_ringbuffer *ringbuf = request->ringbuf;
struct intel_engine_cs *engine = ringbuf->engine;
struct drm_i915_private *dev_priv = request->i915;
uint32_t cmd;
int ret;
ret = intel_ring_begin(request, 4);
if (ret)
return ret;
cmd = MI_FLUSH_DW + 1;
/* We always require a command barrier so that subsequent
* commands, such as breadcrumb interrupts, are strictly ordered
* wrt the contents of the write cache being flushed to memory
* (and thus being coherent from the CPU).
*/
cmd |= MI_FLUSH_DW_STORE_INDEX | MI_FLUSH_DW_OP_STOREDW;
if (invalidate_domains & I915_GEM_GPU_DOMAINS) {
cmd |= MI_INVALIDATE_TLB;
if (engine == &dev_priv->engine[VCS])
cmd |= MI_INVALIDATE_BSD;
}
intel_logical_ring_emit(ringbuf, cmd);
intel_logical_ring_emit(ringbuf,
I915_GEM_HWS_SCRATCH_ADDR |
MI_FLUSH_DW_USE_GTT);
intel_logical_ring_emit(ringbuf, 0); /* upper addr */
intel_logical_ring_emit(ringbuf, 0); /* value */
intel_logical_ring_advance(ringbuf);
return 0;
}
static int gen8_emit_flush_render(struct drm_i915_gem_request *request,
u32 invalidate_domains,
u32 flush_domains)
{
struct intel_ringbuffer *ringbuf = request->ringbuf;
struct intel_engine_cs *engine = ringbuf->engine;
u32 scratch_addr = engine->scratch.gtt_offset + 2 * CACHELINE_BYTES;
bool vf_flush_wa = false, dc_flush_wa = false;
u32 flags = 0;
int ret;
int len;
flags |= PIPE_CONTROL_CS_STALL;
if (flush_domains) {
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 (invalidate_domains) {
flags |= PIPE_CONTROL_TLB_INVALIDATE;
flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
flags |= PIPE_CONTROL_QW_WRITE;
flags |= PIPE_CONTROL_GLOBAL_GTT_IVB;
/*
* On GEN9: before VF_CACHE_INVALIDATE we need to emit a NULL
* pipe control.
*/
if (IS_GEN9(request->i915))
vf_flush_wa = true;
/* WaForGAMHang:kbl */
if (IS_KBL_REVID(request->i915, 0, KBL_REVID_B0))
dc_flush_wa = true;
}
len = 6;
if (vf_flush_wa)
len += 6;
if (dc_flush_wa)
len += 12;
ret = intel_ring_begin(request, len);
if (ret)
return ret;
if (vf_flush_wa) {
intel_logical_ring_emit(ringbuf, GFX_OP_PIPE_CONTROL(6));
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, 0);
}
if (dc_flush_wa) {
intel_logical_ring_emit(ringbuf, GFX_OP_PIPE_CONTROL(6));
intel_logical_ring_emit(ringbuf, PIPE_CONTROL_DC_FLUSH_ENABLE);
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, 0);
}
intel_logical_ring_emit(ringbuf, GFX_OP_PIPE_CONTROL(6));
intel_logical_ring_emit(ringbuf, flags);
intel_logical_ring_emit(ringbuf, scratch_addr);
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, 0);
if (dc_flush_wa) {
intel_logical_ring_emit(ringbuf, GFX_OP_PIPE_CONTROL(6));
intel_logical_ring_emit(ringbuf, PIPE_CONTROL_CS_STALL);
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, 0);
}
intel_logical_ring_advance(ringbuf);
return 0;
}
static u32 gen8_get_seqno(struct intel_engine_cs *engine)
{
return intel_read_status_page(engine, I915_GEM_HWS_INDEX);
}
static void gen8_set_seqno(struct intel_engine_cs *engine, u32 seqno)
{
intel_write_status_page(engine, I915_GEM_HWS_INDEX, seqno);
}
static void bxt_a_seqno_barrier(struct intel_engine_cs *engine)
{
/*
* On BXT A steppings there is a HW coherency issue whereby the
* MI_STORE_DATA_IMM storing the completed request's seqno
* occasionally doesn't invalidate the CPU cache. Work around this by
* clflushing the corresponding cacheline whenever the caller wants
* the coherency to be guaranteed. Note that this cacheline is known
* to be clean at this point, since we only write it in
* bxt_a_set_seqno(), where we also do a clflush after the write. So
* this clflush in practice becomes an invalidate operation.
*/
intel_flush_status_page(engine, I915_GEM_HWS_INDEX);
}
static void bxt_a_set_seqno(struct intel_engine_cs *engine, u32 seqno)
{
intel_write_status_page(engine, I915_GEM_HWS_INDEX, seqno);
/* See bxt_a_get_seqno() explaining the reason for the clflush. */
intel_flush_status_page(engine, I915_GEM_HWS_INDEX);
}
/*
* Reserve space for 2 NOOPs at the end of each request to be
* used as a workaround for not being allowed to do lite
* restore with HEAD==TAIL (WaIdleLiteRestore).
*/
#define WA_TAIL_DWORDS 2
static int gen8_emit_request(struct drm_i915_gem_request *request)
{
struct intel_ringbuffer *ringbuf = request->ringbuf;
int ret;
ret = intel_ring_begin(request, 6 + WA_TAIL_DWORDS);
if (ret)
return ret;
/* w/a: bit 5 needs to be zero for MI_FLUSH_DW address. */
BUILD_BUG_ON(I915_GEM_HWS_INDEX_ADDR & (1 << 5));
intel_logical_ring_emit(ringbuf,
(MI_FLUSH_DW + 1) | MI_FLUSH_DW_OP_STOREDW);
intel_logical_ring_emit(ringbuf,
intel_hws_seqno_address(request->engine) |
MI_FLUSH_DW_USE_GTT);
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, i915_gem_request_get_seqno(request));
intel_logical_ring_emit(ringbuf, MI_USER_INTERRUPT);
intel_logical_ring_emit(ringbuf, MI_NOOP);
return intel_logical_ring_advance_and_submit(request);
}
static int gen8_emit_request_render(struct drm_i915_gem_request *request)
{
struct intel_ringbuffer *ringbuf = request->ringbuf;
int ret;
ret = intel_ring_begin(request, 8 + WA_TAIL_DWORDS);
if (ret)
return ret;
/* We're using qword write, seqno should be aligned to 8 bytes. */
BUILD_BUG_ON(I915_GEM_HWS_INDEX & 1);
/* w/a for post sync ops following a GPGPU operation we
* need a prior CS_STALL, which is emitted by the flush
* following the batch.
*/
intel_logical_ring_emit(ringbuf, GFX_OP_PIPE_CONTROL(6));
intel_logical_ring_emit(ringbuf,
(PIPE_CONTROL_GLOBAL_GTT_IVB |
PIPE_CONTROL_CS_STALL |
PIPE_CONTROL_QW_WRITE));
intel_logical_ring_emit(ringbuf,
intel_hws_seqno_address(request->engine));
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, i915_gem_request_get_seqno(request));
/* We're thrashing one dword of HWS. */
intel_logical_ring_emit(ringbuf, 0);
intel_logical_ring_emit(ringbuf, MI_USER_INTERRUPT);
intel_logical_ring_emit(ringbuf, MI_NOOP);
return intel_logical_ring_advance_and_submit(request);
}
static int intel_lr_context_render_state_init(struct drm_i915_gem_request *req)
{
struct render_state so;
int ret;
ret = i915_gem_render_state_prepare(req->engine, &so);
if (ret)
return ret;
if (so.rodata == NULL)
return 0;
ret = req->engine->emit_bb_start(req, so.ggtt_offset,
I915_DISPATCH_SECURE);
if (ret)
goto out;
ret = req->engine->emit_bb_start(req,
(so.ggtt_offset + so.aux_batch_offset),
I915_DISPATCH_SECURE);
if (ret)
goto out;
i915_vma_move_to_active(i915_gem_obj_to_ggtt(so.obj), req);
out:
i915_gem_render_state_fini(&so);
return ret;
}
static int gen8_init_rcs_context(struct drm_i915_gem_request *req)
{
int ret;
ret = intel_logical_ring_workarounds_emit(req);
if (ret)
return ret;
ret = intel_rcs_context_init_mocs(req);
/*
* Failing to program the MOCS is non-fatal.The system will not
* run at peak performance. So generate an error and carry on.
*/
if (ret)
DRM_ERROR("MOCS failed to program: expect performance issues.\n");
return intel_lr_context_render_state_init(req);
}
/**
* intel_logical_ring_cleanup() - deallocate the Engine Command Streamer
*
* @engine: Engine Command Streamer.
*
*/
void intel_logical_ring_cleanup(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv;
if (!intel_engine_initialized(engine))
return;
/*
* Tasklet cannot be active at this point due intel_mark_active/idle
* so this is just for documentation.
*/
if (WARN_ON(test_bit(TASKLET_STATE_SCHED, &engine->irq_tasklet.state)))
tasklet_kill(&engine->irq_tasklet);
dev_priv = engine->i915;
if (engine->buffer) {
intel_logical_ring_stop(engine);
WARN_ON((I915_READ_MODE(engine) & MODE_IDLE) == 0);
}
if (engine->cleanup)
engine->cleanup(engine);
i915_cmd_parser_fini_ring(engine);
i915_gem_batch_pool_fini(&engine->batch_pool);
if (engine->status_page.obj) {
i915_gem_object_unpin_map(engine->status_page.obj);
engine->status_page.obj = NULL;
}
intel_lr_context_unpin(dev_priv->kernel_context, engine);
engine->idle_lite_restore_wa = 0;
engine->disable_lite_restore_wa = false;
engine->ctx_desc_template = 0;
lrc_destroy_wa_ctx_obj(engine);
engine->i915 = NULL;
}
static void
logical_ring_default_vfuncs(struct intel_engine_cs *engine)
{
/* Default vfuncs which can be overriden by each engine. */
engine->init_hw = gen8_init_common_ring;
engine->emit_request = gen8_emit_request;
engine->emit_flush = gen8_emit_flush;
engine->irq_get = gen8_logical_ring_get_irq;
engine->irq_put = gen8_logical_ring_put_irq;
engine->emit_bb_start = gen8_emit_bb_start;
engine->get_seqno = gen8_get_seqno;
engine->set_seqno = gen8_set_seqno;
if (IS_BXT_REVID(engine->i915, 0, BXT_REVID_A1)) {
engine->irq_seqno_barrier = bxt_a_seqno_barrier;
engine->set_seqno = bxt_a_set_seqno;
}
}
static inline void
logical_ring_default_irqs(struct intel_engine_cs *engine, unsigned shift)
{
engine->irq_enable_mask = GT_RENDER_USER_INTERRUPT << shift;
engine->irq_keep_mask = GT_CONTEXT_SWITCH_INTERRUPT << shift;
init_waitqueue_head(&engine->irq_queue);
}
static int
lrc_setup_hws(struct intel_engine_cs *engine,
struct drm_i915_gem_object *dctx_obj)
{
void *hws;
/* The HWSP is part of the default context object in LRC mode. */
engine->status_page.gfx_addr = i915_gem_obj_ggtt_offset(dctx_obj) +
LRC_PPHWSP_PN * PAGE_SIZE;
hws = i915_gem_object_pin_map(dctx_obj);
if (IS_ERR(hws))
return PTR_ERR(hws);
engine->status_page.page_addr = hws + LRC_PPHWSP_PN * PAGE_SIZE;
engine->status_page.obj = dctx_obj;
return 0;
}
static const struct logical_ring_info {
const char *name;
unsigned exec_id;
unsigned guc_id;
u32 mmio_base;
unsigned irq_shift;
} logical_rings[] = {
[RCS] = {
.name = "render ring",
.exec_id = I915_EXEC_RENDER,
.guc_id = GUC_RENDER_ENGINE,
.mmio_base = RENDER_RING_BASE,
.irq_shift = GEN8_RCS_IRQ_SHIFT,
},
[BCS] = {
.name = "blitter ring",
.exec_id = I915_EXEC_BLT,
.guc_id = GUC_BLITTER_ENGINE,
.mmio_base = BLT_RING_BASE,
.irq_shift = GEN8_BCS_IRQ_SHIFT,
},
[VCS] = {
.name = "bsd ring",
.exec_id = I915_EXEC_BSD,
.guc_id = GUC_VIDEO_ENGINE,
.mmio_base = GEN6_BSD_RING_BASE,
.irq_shift = GEN8_VCS1_IRQ_SHIFT,
},
[VCS2] = {
.name = "bsd2 ring",
.exec_id = I915_EXEC_BSD,
.guc_id = GUC_VIDEO_ENGINE2,
.mmio_base = GEN8_BSD2_RING_BASE,
.irq_shift = GEN8_VCS2_IRQ_SHIFT,
},
[VECS] = {
.name = "video enhancement ring",
.exec_id = I915_EXEC_VEBOX,
.guc_id = GUC_VIDEOENHANCE_ENGINE,
.mmio_base = VEBOX_RING_BASE,
.irq_shift = GEN8_VECS_IRQ_SHIFT,
},
};
static struct intel_engine_cs *
logical_ring_setup(struct drm_device *dev, enum intel_engine_id id)
{
const struct logical_ring_info *info = &logical_rings[id];
struct drm_i915_private *dev_priv = to_i915(dev);
struct intel_engine_cs *engine = &dev_priv->engine[id];
enum forcewake_domains fw_domains;
engine->id = id;
engine->name = info->name;
engine->exec_id = info->exec_id;
engine->guc_id = info->guc_id;
engine->mmio_base = info->mmio_base;
engine->i915 = dev_priv;
/* Intentionally left blank. */
engine->buffer = NULL;
fw_domains = intel_uncore_forcewake_for_reg(dev_priv,
RING_ELSP(engine),
FW_REG_WRITE);
fw_domains |= intel_uncore_forcewake_for_reg(dev_priv,
RING_CONTEXT_STATUS_PTR(engine),
FW_REG_READ | FW_REG_WRITE);
fw_domains |= intel_uncore_forcewake_for_reg(dev_priv,
RING_CONTEXT_STATUS_BUF_BASE(engine),
FW_REG_READ);
engine->fw_domains = fw_domains;
INIT_LIST_HEAD(&engine->active_list);
INIT_LIST_HEAD(&engine->request_list);
INIT_LIST_HEAD(&engine->buffers);
INIT_LIST_HEAD(&engine->execlist_queue);
spin_lock_init(&engine->execlist_lock);
tasklet_init(&engine->irq_tasklet,
intel_lrc_irq_handler, (unsigned long)engine);
logical_ring_init_platform_invariants(engine);
logical_ring_default_vfuncs(engine);
logical_ring_default_irqs(engine, info->irq_shift);
intel_engine_init_hangcheck(engine);
i915_gem_batch_pool_init(dev, &engine->batch_pool);
return engine;
}
static int
logical_ring_init(struct intel_engine_cs *engine)
{
struct i915_gem_context *dctx = engine->i915->kernel_context;
int ret;
ret = i915_cmd_parser_init_ring(engine);
if (ret)
goto error;
ret = execlists_context_deferred_alloc(dctx, engine);
if (ret)
goto error;
/* As this is the default context, always pin it */
ret = intel_lr_context_pin(dctx, engine);
if (ret) {
DRM_ERROR("Failed to pin context for %s: %d\n",
engine->name, ret);
goto error;
}
/* And setup the hardware status page. */
ret = lrc_setup_hws(engine, dctx->engine[engine->id].state);
if (ret) {
DRM_ERROR("Failed to set up hws %s: %d\n", engine->name, ret);
goto error;
}
return 0;
error:
intel_logical_ring_cleanup(engine);
return ret;
}
static int logical_render_ring_init(struct drm_device *dev)
{
struct intel_engine_cs *engine = logical_ring_setup(dev, RCS);
int ret;
if (HAS_L3_DPF(dev))
engine->irq_keep_mask |= GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
/* Override some for render ring. */
if (INTEL_INFO(dev)->gen >= 9)
engine->init_hw = gen9_init_render_ring;
else
engine->init_hw = gen8_init_render_ring;
engine->init_context = gen8_init_rcs_context;
engine->cleanup = intel_fini_pipe_control;
engine->emit_flush = gen8_emit_flush_render;
engine->emit_request = gen8_emit_request_render;
ret = intel_init_pipe_control(engine);
if (ret)
return ret;
ret = intel_init_workaround_bb(engine);
if (ret) {
/*
* We continue even if we fail to initialize WA batch
* because we only expect rare glitches but nothing
* critical to prevent us from using GPU
*/
DRM_ERROR("WA batch buffer initialization failed: %d\n",
ret);
}
ret = logical_ring_init(engine);
if (ret) {
lrc_destroy_wa_ctx_obj(engine);
}
return ret;
}
static int logical_bsd_ring_init(struct drm_device *dev)
{
struct intel_engine_cs *engine = logical_ring_setup(dev, VCS);
return logical_ring_init(engine);
}
static int logical_bsd2_ring_init(struct drm_device *dev)
{
struct intel_engine_cs *engine = logical_ring_setup(dev, VCS2);
return logical_ring_init(engine);
}
static int logical_blt_ring_init(struct drm_device *dev)
{
struct intel_engine_cs *engine = logical_ring_setup(dev, BCS);
return logical_ring_init(engine);
}
static int logical_vebox_ring_init(struct drm_device *dev)
{
struct intel_engine_cs *engine = logical_ring_setup(dev, VECS);
return logical_ring_init(engine);
}
/**
* intel_logical_rings_init() - allocate, populate and init the Engine Command Streamers
* @dev: DRM device.
*
* This function inits the engines for an Execlists submission style (the equivalent in the
* legacy ringbuffer submission world would be i915_gem_init_engines). It does it only for
* those engines that are present in the hardware.
*
* Return: non-zero if the initialization failed.
*/
int intel_logical_rings_init(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
ret = logical_render_ring_init(dev);
if (ret)
return ret;
if (HAS_BSD(dev)) {
ret = logical_bsd_ring_init(dev);
if (ret)
goto cleanup_render_ring;
}
if (HAS_BLT(dev)) {
ret = logical_blt_ring_init(dev);
if (ret)
goto cleanup_bsd_ring;
}
if (HAS_VEBOX(dev)) {
ret = logical_vebox_ring_init(dev);
if (ret)
goto cleanup_blt_ring;
}
if (HAS_BSD2(dev)) {
ret = logical_bsd2_ring_init(dev);
if (ret)
goto cleanup_vebox_ring;
}
return 0;
cleanup_vebox_ring:
intel_logical_ring_cleanup(&dev_priv->engine[VECS]);
cleanup_blt_ring:
intel_logical_ring_cleanup(&dev_priv->engine[BCS]);
cleanup_bsd_ring:
intel_logical_ring_cleanup(&dev_priv->engine[VCS]);
cleanup_render_ring:
intel_logical_ring_cleanup(&dev_priv->engine[RCS]);
return ret;
}
static u32
make_rpcs(struct drm_i915_private *dev_priv)
{
u32 rpcs = 0;
/*
* No explicit RPCS request is needed to ensure full
* slice/subslice/EU enablement prior to Gen9.
*/
if (INTEL_GEN(dev_priv) < 9)
return 0;
/*
* Starting in Gen9, render power gating can leave
* slice/subslice/EU in a partially enabled state. We
* must make an explicit request through RPCS for full
* enablement.
*/
if (INTEL_INFO(dev_priv)->has_slice_pg) {
rpcs |= GEN8_RPCS_S_CNT_ENABLE;
rpcs |= INTEL_INFO(dev_priv)->slice_total <<
GEN8_RPCS_S_CNT_SHIFT;
rpcs |= GEN8_RPCS_ENABLE;
}
if (INTEL_INFO(dev_priv)->has_subslice_pg) {
rpcs |= GEN8_RPCS_SS_CNT_ENABLE;
rpcs |= INTEL_INFO(dev_priv)->subslice_per_slice <<
GEN8_RPCS_SS_CNT_SHIFT;
rpcs |= GEN8_RPCS_ENABLE;
}
if (INTEL_INFO(dev_priv)->has_eu_pg) {
rpcs |= INTEL_INFO(dev_priv)->eu_per_subslice <<
GEN8_RPCS_EU_MIN_SHIFT;
rpcs |= INTEL_INFO(dev_priv)->eu_per_subslice <<
GEN8_RPCS_EU_MAX_SHIFT;
rpcs |= GEN8_RPCS_ENABLE;
}
return rpcs;
}
static u32 intel_lr_indirect_ctx_offset(struct intel_engine_cs *engine)
{
u32 indirect_ctx_offset;
switch (INTEL_GEN(engine->i915)) {
default:
MISSING_CASE(INTEL_GEN(engine->i915));
/* fall through */
case 9:
indirect_ctx_offset =
GEN9_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT;
break;
case 8:
indirect_ctx_offset =
GEN8_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT;
break;
}
return indirect_ctx_offset;
}
static int
populate_lr_context(struct i915_gem_context *ctx,
struct drm_i915_gem_object *ctx_obj,
struct intel_engine_cs *engine,
struct intel_ringbuffer *ringbuf)
{
struct drm_i915_private *dev_priv = ctx->i915;
struct i915_hw_ppgtt *ppgtt = ctx->ppgtt;
void *vaddr;
u32 *reg_state;
int ret;
if (!ppgtt)
ppgtt = dev_priv->mm.aliasing_ppgtt;
ret = i915_gem_object_set_to_cpu_domain(ctx_obj, true);
if (ret) {
DRM_DEBUG_DRIVER("Could not set to CPU domain\n");
return ret;
}
vaddr = i915_gem_object_pin_map(ctx_obj);
if (IS_ERR(vaddr)) {
ret = PTR_ERR(vaddr);
DRM_DEBUG_DRIVER("Could not map object pages! (%d)\n", ret);
return ret;
}
ctx_obj->dirty = true;
/* The second page of the context object contains some fields which must
* be set up prior to the first execution. */
reg_state = vaddr + LRC_STATE_PN * PAGE_SIZE;
/* A context is actually a big batch buffer with several MI_LOAD_REGISTER_IMM
* commands followed by (reg, value) pairs. The values we are setting here are
* only for the first context restore: on a subsequent save, the GPU will
* recreate this batchbuffer with new values (including all the missing
* MI_LOAD_REGISTER_IMM commands that we are not initializing here). */
reg_state[CTX_LRI_HEADER_0] =
MI_LOAD_REGISTER_IMM(engine->id == RCS ? 14 : 11) | MI_LRI_FORCE_POSTED;
ASSIGN_CTX_REG(reg_state, CTX_CONTEXT_CONTROL,
RING_CONTEXT_CONTROL(engine),
_MASKED_BIT_ENABLE(CTX_CTRL_INHIBIT_SYN_CTX_SWITCH |
CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT |
(HAS_RESOURCE_STREAMER(dev_priv) ?
CTX_CTRL_RS_CTX_ENABLE : 0)));
ASSIGN_CTX_REG(reg_state, CTX_RING_HEAD, RING_HEAD(engine->mmio_base),
0);
ASSIGN_CTX_REG(reg_state, CTX_RING_TAIL, RING_TAIL(engine->mmio_base),
0);
/* Ring buffer start address is not known until the buffer is pinned.
* It is written to the context image in execlists_update_context()
*/
ASSIGN_CTX_REG(reg_state, CTX_RING_BUFFER_START,
RING_START(engine->mmio_base), 0);
ASSIGN_CTX_REG(reg_state, CTX_RING_BUFFER_CONTROL,
RING_CTL(engine->mmio_base),
((ringbuf->size - PAGE_SIZE) & RING_NR_PAGES) | RING_VALID);
ASSIGN_CTX_REG(reg_state, CTX_BB_HEAD_U,
RING_BBADDR_UDW(engine->mmio_base), 0);
ASSIGN_CTX_REG(reg_state, CTX_BB_HEAD_L,
RING_BBADDR(engine->mmio_base), 0);
ASSIGN_CTX_REG(reg_state, CTX_BB_STATE,
RING_BBSTATE(engine->mmio_base),
RING_BB_PPGTT);
ASSIGN_CTX_REG(reg_state, CTX_SECOND_BB_HEAD_U,
RING_SBBADDR_UDW(engine->mmio_base), 0);
ASSIGN_CTX_REG(reg_state, CTX_SECOND_BB_HEAD_L,
RING_SBBADDR(engine->mmio_base), 0);
ASSIGN_CTX_REG(reg_state, CTX_SECOND_BB_STATE,
RING_SBBSTATE(engine->mmio_base), 0);
if (engine->id == RCS) {
ASSIGN_CTX_REG(reg_state, CTX_BB_PER_CTX_PTR,
RING_BB_PER_CTX_PTR(engine->mmio_base), 0);
ASSIGN_CTX_REG(reg_state, CTX_RCS_INDIRECT_CTX,
RING_INDIRECT_CTX(engine->mmio_base), 0);
ASSIGN_CTX_REG(reg_state, CTX_RCS_INDIRECT_CTX_OFFSET,
RING_INDIRECT_CTX_OFFSET(engine->mmio_base), 0);
if (engine->wa_ctx.obj) {
struct i915_ctx_workarounds *wa_ctx = &engine->wa_ctx;
uint32_t ggtt_offset = i915_gem_obj_ggtt_offset(wa_ctx->obj);
reg_state[CTX_RCS_INDIRECT_CTX+1] =
(ggtt_offset + wa_ctx->indirect_ctx.offset * sizeof(uint32_t)) |
(wa_ctx->indirect_ctx.size / CACHELINE_DWORDS);
reg_state[CTX_RCS_INDIRECT_CTX_OFFSET+1] =
intel_lr_indirect_ctx_offset(engine) << 6;
reg_state[CTX_BB_PER_CTX_PTR+1] =
(ggtt_offset + wa_ctx->per_ctx.offset * sizeof(uint32_t)) |
0x01;
}
}
reg_state[CTX_LRI_HEADER_1] = MI_LOAD_REGISTER_IMM(9) | MI_LRI_FORCE_POSTED;
ASSIGN_CTX_REG(reg_state, CTX_CTX_TIMESTAMP,
RING_CTX_TIMESTAMP(engine->mmio_base), 0);
/* PDP values well be assigned later if needed */
ASSIGN_CTX_REG(reg_state, CTX_PDP3_UDW, GEN8_RING_PDP_UDW(engine, 3),
0);
ASSIGN_CTX_REG(reg_state, CTX_PDP3_LDW, GEN8_RING_PDP_LDW(engine, 3),
0);
ASSIGN_CTX_REG(reg_state, CTX_PDP2_UDW, GEN8_RING_PDP_UDW(engine, 2),
0);
ASSIGN_CTX_REG(reg_state, CTX_PDP2_LDW, GEN8_RING_PDP_LDW(engine, 2),
0);
ASSIGN_CTX_REG(reg_state, CTX_PDP1_UDW, GEN8_RING_PDP_UDW(engine, 1),
0);
ASSIGN_CTX_REG(reg_state, CTX_PDP1_LDW, GEN8_RING_PDP_LDW(engine, 1),
0);
ASSIGN_CTX_REG(reg_state, CTX_PDP0_UDW, GEN8_RING_PDP_UDW(engine, 0),
0);
ASSIGN_CTX_REG(reg_state, CTX_PDP0_LDW, GEN8_RING_PDP_LDW(engine, 0),
0);
if (USES_FULL_48BIT_PPGTT(ppgtt->base.dev)) {
/* 64b PPGTT (48bit canonical)
* PDP0_DESCRIPTOR contains the base address to PML4 and
* other PDP Descriptors are ignored.
*/
ASSIGN_CTX_PML4(ppgtt, reg_state);
} else {
/* 32b PPGTT
* PDP*_DESCRIPTOR contains the base address of space supported.
* With dynamic page allocation, PDPs may not be allocated at
* this point. Point the unallocated PDPs to the scratch page
*/
execlists_update_context_pdps(ppgtt, reg_state);
}
if (engine->id == RCS) {
reg_state[CTX_LRI_HEADER_2] = MI_LOAD_REGISTER_IMM(1);
ASSIGN_CTX_REG(reg_state, CTX_R_PWR_CLK_STATE, GEN8_R_PWR_CLK_STATE,
make_rpcs(dev_priv));
}
i915_gem_object_unpin_map(ctx_obj);
return 0;
}
/**
* intel_lr_context_size() - return the size of the context for an engine
* @engine: which engine to find the context size for
*
* Each engine may require a different amount of space for a context image,
* so when allocating (or copying) an image, this function can be used to
* find the right size for the specific engine.
*
* Return: size (in bytes) of an engine-specific context image
*
* Note: this size includes the HWSP, which is part of the context image
* in LRC mode, but does not include the "shared data page" used with
* GuC submission. The caller should account for this if using the GuC.
*/
uint32_t intel_lr_context_size(struct intel_engine_cs *engine)
{
int ret = 0;
WARN_ON(INTEL_GEN(engine->i915) < 8);
switch (engine->id) {
case RCS:
if (INTEL_GEN(engine->i915) >= 9)
ret = GEN9_LR_CONTEXT_RENDER_SIZE;
else
ret = GEN8_LR_CONTEXT_RENDER_SIZE;
break;
case VCS:
case BCS:
case VECS:
case VCS2:
ret = GEN8_LR_CONTEXT_OTHER_SIZE;
break;
}
return ret;
}
/**
* execlists_context_deferred_alloc() - create the LRC specific bits of a context
* @ctx: LR context to create.
* @engine: engine to be used with the context.
*
* This function can be called more than once, with different engines, if we plan
* to use the context with them. The context backing objects and the ringbuffers
* (specially the ringbuffer backing objects) suck a lot of memory up, and that's why
* the creation is a deferred call: it's better to make sure first that we need to use
* a given ring with the context.
*
* Return: non-zero on error.
*/
static int execlists_context_deferred_alloc(struct i915_gem_context *ctx,
struct intel_engine_cs *engine)
{
struct drm_i915_gem_object *ctx_obj;
struct intel_context *ce = &ctx->engine[engine->id];
uint32_t context_size;
struct intel_ringbuffer *ringbuf;
int ret;
WARN_ON(ce->state);
context_size = round_up(intel_lr_context_size(engine), 4096);
/* One extra page as the sharing data between driver and GuC */
context_size += PAGE_SIZE * LRC_PPHWSP_PN;
ctx_obj = i915_gem_object_create(ctx->i915->dev, context_size);
if (IS_ERR(ctx_obj)) {
DRM_DEBUG_DRIVER("Alloc LRC backing obj failed.\n");
return PTR_ERR(ctx_obj);
}
ringbuf = intel_engine_create_ringbuffer(engine, ctx->ring_size);
if (IS_ERR(ringbuf)) {
ret = PTR_ERR(ringbuf);
goto error_deref_obj;
}
ret = populate_lr_context(ctx, ctx_obj, engine, ringbuf);
if (ret) {
DRM_DEBUG_DRIVER("Failed to populate LRC: %d\n", ret);
goto error_ringbuf;
}
ce->ringbuf = ringbuf;
ce->state = ctx_obj;
ce->initialised = engine->init_context == NULL;
return 0;
error_ringbuf:
intel_ringbuffer_free(ringbuf);
error_deref_obj:
drm_gem_object_unreference(&ctx_obj->base);
ce->ringbuf = NULL;
ce->state = NULL;
return ret;
}
void intel_lr_context_reset(struct drm_i915_private *dev_priv,
struct i915_gem_context *ctx)
{
struct intel_engine_cs *engine;
for_each_engine(engine, dev_priv) {
struct intel_context *ce = &ctx->engine[engine->id];
struct drm_i915_gem_object *ctx_obj = ce->state;
void *vaddr;
uint32_t *reg_state;
if (!ctx_obj)
continue;
vaddr = i915_gem_object_pin_map(ctx_obj);
if (WARN_ON(IS_ERR(vaddr)))
continue;
reg_state = vaddr + LRC_STATE_PN * PAGE_SIZE;
ctx_obj->dirty = true;
reg_state[CTX_RING_HEAD+1] = 0;
reg_state[CTX_RING_TAIL+1] = 0;
i915_gem_object_unpin_map(ctx_obj);
ce->ringbuf->head = 0;
ce->ringbuf->tail = 0;
}
}
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