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3b3f1650b1
With the possibility of addition of many more number of rings in future, the drm_i915_private structure could bloat as an array, of type intel_engine_cs, is embedded inside it. struct intel_engine_cs engine[I915_NUM_ENGINES]; Though this is still fine as generally there is only a single instance of drm_i915_private structure used, but not all of the possible rings would be enabled or active on most of the platforms. Some memory can be saved by allocating intel_engine_cs structure only for the enabled/active engines. Currently the engine/ring ID is kept static and dev_priv->engine[] is simply indexed using the enums defined in intel_engine_id. To save memory and continue using the static engine/ring IDs, 'engine' is defined as an array of pointers. struct intel_engine_cs *engine[I915_NUM_ENGINES]; dev_priv->engine[engine_ID] will be NULL for disabled engine instances. There is a text size reduction of 928 bytes, from 1028200 to 1027272, for i915.o file (but for i915.ko file text size remain same as 1193131 bytes). v2: - Remove the engine iterator field added in drm_i915_private structure, instead pass a local iterator variable to the for_each_engine** macros. (Chris) - Do away with intel_engine_initialized() and instead directly use the NULL pointer check on engine pointer. (Chris) v3: - Remove for_each_engine_id() macro, as the updated macro for_each_engine() can be used in place of it. (Chris) - Protect the access to Render engine Fault register with a NULL check, as engine specific init is done later in Driver load sequence. v4: - Use !!dev_priv->engine[VCS] style for the engine check in getparam. (Chris) - Kill the superfluous init_engine_lists(). v5: - Cleanup the intel_engines_init() & intel_engines_setup(), with respect to allocation of intel_engine_cs structure. (Chris) v6: - Rebase. v7: - Optimize the for_each_engine_masked() macro. (Chris) - Change the type of 'iter' local variable to enum intel_engine_id. (Chris) - Rebase. v8: Rebase. v9: Rebase. v10: - For index calculation use engine ID instead of pointer based arithmetic in intel_engine_sync_index() as engine pointers are not contiguous now (Chris) - For appropriateness, rename local enum variable 'iter' to 'id'. (Joonas) - Use for_each_engine macro for cleanup in intel_engines_init() and remove check for NULL engine pointer in cleanup() routines. (Joonas) v11: Rebase. Cc: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Akash Goel <akash.goel@intel.com> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1476378888-7372-1-git-send-email-akash.goel@intel.com
2192 lines
66 KiB
C
2192 lines
66 KiB
C
/*
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* Copyright © 2014 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Ben Widawsky <ben@bwidawsk.net>
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* Michel Thierry <michel.thierry@intel.com>
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* Thomas Daniel <thomas.daniel@intel.com>
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* Oscar Mateo <oscar.mateo@intel.com>
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*
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*/
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/**
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* DOC: Logical Rings, Logical Ring Contexts and Execlists
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*
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* Motivation:
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* GEN8 brings an expansion of the HW contexts: "Logical Ring Contexts".
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* These expanded contexts enable a number of new abilities, especially
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* "Execlists" (also implemented in this file).
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*
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* One of the main differences with the legacy HW contexts is that logical
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* ring contexts incorporate many more things to the context's state, like
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* PDPs or ringbuffer control registers:
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*
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* The reason why PDPs are included in the context is straightforward: as
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* PPGTTs (per-process GTTs) are actually per-context, having the PDPs
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* contained there mean you don't need to do a ppgtt->switch_mm yourself,
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* instead, the GPU will do it for you on the context switch.
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*
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* But, what about the ringbuffer control registers (head, tail, etc..)?
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* shouldn't we just need a set of those per engine command streamer? This is
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* where the name "Logical Rings" starts to make sense: by virtualizing the
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* rings, the engine cs shifts to a new "ring buffer" with every context
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* switch. When you want to submit a workload to the GPU you: A) choose your
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* context, B) find its appropriate virtualized ring, C) write commands to it
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* and then, finally, D) tell the GPU to switch to that context.
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*
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* Instead of the legacy MI_SET_CONTEXT, the way you tell the GPU to switch
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* to a contexts is via a context execution list, ergo "Execlists".
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*
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* LRC implementation:
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* Regarding the creation of contexts, we have:
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*
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* - One global default context.
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* - One local default context for each opened fd.
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* - One local extra context for each context create ioctl call.
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*
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* Now that ringbuffers belong per-context (and not per-engine, like before)
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* and that contexts are uniquely tied to a given engine (and not reusable,
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* like before) we need:
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*
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* - One ringbuffer per-engine inside each context.
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* - One backing object per-engine inside each context.
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*
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* The global default context starts its life with these new objects fully
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* allocated and populated. The local default context for each opened fd is
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* more complex, because we don't know at creation time which engine is going
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* to use them. To handle this, we have implemented a deferred creation of LR
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* contexts:
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*
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* The local context starts its life as a hollow or blank holder, that only
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* gets populated for a given engine once we receive an execbuffer. If later
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* on we receive another execbuffer ioctl for the same context but a different
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* engine, we allocate/populate a new ringbuffer and context backing object and
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* so on.
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*
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* Finally, regarding local contexts created using the ioctl call: as they are
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* only allowed with the render ring, we can allocate & populate them right
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* away (no need to defer anything, at least for now).
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*
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* Execlists implementation:
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* Execlists are the new method by which, on gen8+ hardware, workloads are
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* submitted for execution (as opposed to the legacy, ringbuffer-based, method).
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* This method works as follows:
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*
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* When a request is committed, its commands (the BB start and any leading or
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* trailing commands, like the seqno breadcrumbs) are placed in the ringbuffer
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* for the appropriate context. The tail pointer in the hardware context is not
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* updated at this time, but instead, kept by the driver in the ringbuffer
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* structure. A structure representing this request is added to a request queue
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* for the appropriate engine: this structure contains a copy of the context's
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* tail after the request was written to the ring buffer and a pointer to the
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* context itself.
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*
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* If the engine's request queue was empty before the request was added, the
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* queue is processed immediately. Otherwise the queue will be processed during
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* a context switch interrupt. In any case, elements on the queue will get sent
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* (in pairs) to the GPU's ExecLists Submit Port (ELSP, for short) with a
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* globally unique 20-bits submission ID.
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*
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* When execution of a request completes, the GPU updates the context status
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* buffer with a context complete event and generates a context switch interrupt.
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* During the interrupt handling, the driver examines the events in the buffer:
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* for each context complete event, if the announced ID matches that on the head
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* of the request queue, then that request is retired and removed from the queue.
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*
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* After processing, if any requests were retired and the queue is not empty
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* then a new execution list can be submitted. The two requests at the front of
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* the queue are next to be submitted but since a context may not occur twice in
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* an execution list, if subsequent requests have the same ID as the first then
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* the two requests must be combined. This is done simply by discarding requests
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* at the head of the queue until either only one requests is left (in which case
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* we use a NULL second context) or the first two requests have unique IDs.
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*
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* By always executing the first two requests in the queue the driver ensures
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* that the GPU is kept as busy as possible. In the case where a single context
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* completes but a second context is still executing, the request for this second
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* context will be at the head of the queue when we remove the first one. This
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* request will then be resubmitted along with a new request for a different context,
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* which will cause the hardware to continue executing the second request and queue
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* the new request (the GPU detects the condition of a context getting preempted
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* with the same context and optimizes the context switch flow by not doing
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* preemption, but just sampling the new tail pointer).
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*
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*/
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#include <linux/interrupt.h>
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#include <drm/drmP.h>
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#include <drm/i915_drm.h>
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#include "i915_drv.h"
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#include "intel_mocs.h"
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#define GEN9_LR_CONTEXT_RENDER_SIZE (22 * PAGE_SIZE)
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#define GEN8_LR_CONTEXT_RENDER_SIZE (20 * PAGE_SIZE)
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#define GEN8_LR_CONTEXT_OTHER_SIZE (2 * PAGE_SIZE)
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#define RING_EXECLIST_QFULL (1 << 0x2)
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#define RING_EXECLIST1_VALID (1 << 0x3)
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#define RING_EXECLIST0_VALID (1 << 0x4)
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#define RING_EXECLIST_ACTIVE_STATUS (3 << 0xE)
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#define RING_EXECLIST1_ACTIVE (1 << 0x11)
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#define RING_EXECLIST0_ACTIVE (1 << 0x12)
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#define GEN8_CTX_STATUS_IDLE_ACTIVE (1 << 0)
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#define GEN8_CTX_STATUS_PREEMPTED (1 << 1)
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#define GEN8_CTX_STATUS_ELEMENT_SWITCH (1 << 2)
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#define GEN8_CTX_STATUS_ACTIVE_IDLE (1 << 3)
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#define GEN8_CTX_STATUS_COMPLETE (1 << 4)
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#define GEN8_CTX_STATUS_LITE_RESTORE (1 << 15)
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#define GEN8_CTX_STATUS_COMPLETED_MASK \
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(GEN8_CTX_STATUS_ACTIVE_IDLE | \
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GEN8_CTX_STATUS_PREEMPTED | \
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GEN8_CTX_STATUS_ELEMENT_SWITCH)
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#define CTX_LRI_HEADER_0 0x01
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#define CTX_CONTEXT_CONTROL 0x02
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#define CTX_RING_HEAD 0x04
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#define CTX_RING_TAIL 0x06
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#define CTX_RING_BUFFER_START 0x08
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#define CTX_RING_BUFFER_CONTROL 0x0a
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#define CTX_BB_HEAD_U 0x0c
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#define CTX_BB_HEAD_L 0x0e
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#define CTX_BB_STATE 0x10
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#define CTX_SECOND_BB_HEAD_U 0x12
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#define CTX_SECOND_BB_HEAD_L 0x14
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#define CTX_SECOND_BB_STATE 0x16
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#define CTX_BB_PER_CTX_PTR 0x18
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#define CTX_RCS_INDIRECT_CTX 0x1a
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#define CTX_RCS_INDIRECT_CTX_OFFSET 0x1c
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#define CTX_LRI_HEADER_1 0x21
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#define CTX_CTX_TIMESTAMP 0x22
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#define CTX_PDP3_UDW 0x24
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#define CTX_PDP3_LDW 0x26
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#define CTX_PDP2_UDW 0x28
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#define CTX_PDP2_LDW 0x2a
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#define CTX_PDP1_UDW 0x2c
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#define CTX_PDP1_LDW 0x2e
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#define CTX_PDP0_UDW 0x30
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#define CTX_PDP0_LDW 0x32
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#define CTX_LRI_HEADER_2 0x41
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#define CTX_R_PWR_CLK_STATE 0x42
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#define CTX_GPGPU_CSR_BASE_ADDRESS 0x44
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#define GEN8_CTX_VALID (1<<0)
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#define GEN8_CTX_FORCE_PD_RESTORE (1<<1)
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#define GEN8_CTX_FORCE_RESTORE (1<<2)
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#define GEN8_CTX_L3LLC_COHERENT (1<<5)
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#define GEN8_CTX_PRIVILEGE (1<<8)
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#define ASSIGN_CTX_REG(reg_state, pos, reg, val) do { \
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(reg_state)[(pos)+0] = i915_mmio_reg_offset(reg); \
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(reg_state)[(pos)+1] = (val); \
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} while (0)
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#define ASSIGN_CTX_PDP(ppgtt, reg_state, n) do { \
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const u64 _addr = i915_page_dir_dma_addr((ppgtt), (n)); \
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reg_state[CTX_PDP ## n ## _UDW+1] = upper_32_bits(_addr); \
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reg_state[CTX_PDP ## n ## _LDW+1] = lower_32_bits(_addr); \
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} while (0)
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#define ASSIGN_CTX_PML4(ppgtt, reg_state) do { \
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reg_state[CTX_PDP0_UDW + 1] = upper_32_bits(px_dma(&ppgtt->pml4)); \
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reg_state[CTX_PDP0_LDW + 1] = lower_32_bits(px_dma(&ppgtt->pml4)); \
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} while (0)
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enum {
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FAULT_AND_HANG = 0,
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FAULT_AND_HALT, /* Debug only */
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FAULT_AND_STREAM,
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FAULT_AND_CONTINUE /* Unsupported */
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};
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#define GEN8_CTX_ID_SHIFT 32
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#define GEN8_CTX_ID_WIDTH 21
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#define GEN8_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT 0x17
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#define GEN9_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT 0x26
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/* Typical size of the average request (2 pipecontrols and a MI_BB) */
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#define EXECLISTS_REQUEST_SIZE 64 /* bytes */
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#define WA_TAIL_DWORDS 2
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static int execlists_context_deferred_alloc(struct i915_gem_context *ctx,
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struct intel_engine_cs *engine);
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static int intel_lr_context_pin(struct i915_gem_context *ctx,
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struct intel_engine_cs *engine);
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static void execlists_init_reg_state(u32 *reg_state,
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struct i915_gem_context *ctx,
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struct intel_engine_cs *engine,
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struct intel_ring *ring);
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/**
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* intel_sanitize_enable_execlists() - sanitize i915.enable_execlists
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* @dev_priv: i915 device private
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* @enable_execlists: value of i915.enable_execlists module parameter.
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*
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* Only certain platforms support Execlists (the prerequisites being
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* support for Logical Ring Contexts and Aliasing PPGTT or better).
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*
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* Return: 1 if Execlists is supported and has to be enabled.
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*/
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int intel_sanitize_enable_execlists(struct drm_i915_private *dev_priv, int enable_execlists)
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{
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/* On platforms with execlist available, vGPU will only
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* support execlist mode, no ring buffer mode.
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*/
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if (HAS_LOGICAL_RING_CONTEXTS(dev_priv) && intel_vgpu_active(dev_priv))
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return 1;
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if (INTEL_GEN(dev_priv) >= 9)
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return 1;
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if (enable_execlists == 0)
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return 0;
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if (HAS_LOGICAL_RING_CONTEXTS(dev_priv) &&
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USES_PPGTT(dev_priv) &&
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i915.use_mmio_flip >= 0)
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return 1;
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return 0;
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}
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static void
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logical_ring_init_platform_invariants(struct intel_engine_cs *engine)
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{
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struct drm_i915_private *dev_priv = engine->i915;
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engine->disable_lite_restore_wa =
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IS_BXT_REVID(dev_priv, 0, BXT_REVID_A1) &&
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(engine->id == VCS || engine->id == VCS2);
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engine->ctx_desc_template = GEN8_CTX_VALID;
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if (IS_GEN8(dev_priv))
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engine->ctx_desc_template |= GEN8_CTX_L3LLC_COHERENT;
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engine->ctx_desc_template |= GEN8_CTX_PRIVILEGE;
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/* TODO: WaDisableLiteRestore when we start using semaphore
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* signalling between Command Streamers */
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/* ring->ctx_desc_template |= GEN8_CTX_FORCE_RESTORE; */
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/* WaEnableForceRestoreInCtxtDescForVCS:skl */
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/* WaEnableForceRestoreInCtxtDescForVCS:bxt */
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if (engine->disable_lite_restore_wa)
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engine->ctx_desc_template |= GEN8_CTX_FORCE_RESTORE;
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}
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/**
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* intel_lr_context_descriptor_update() - calculate & cache the descriptor
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* descriptor for a pinned context
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* @ctx: Context to work on
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* @engine: Engine the descriptor will be used with
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*
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* The context descriptor encodes various attributes of a context,
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* including its GTT address and some flags. Because it's fairly
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* expensive to calculate, we'll just do it once and cache the result,
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* which remains valid until the context is unpinned.
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*
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* This is what a descriptor looks like, from LSB to MSB::
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*
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* bits 0-11: flags, GEN8_CTX_* (cached in ctx_desc_template)
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* bits 12-31: LRCA, GTT address of (the HWSP of) this context
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* bits 32-52: ctx ID, a globally unique tag
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* bits 53-54: mbz, reserved for use by hardware
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* bits 55-63: group ID, currently unused and set to 0
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*/
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static void
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intel_lr_context_descriptor_update(struct i915_gem_context *ctx,
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struct intel_engine_cs *engine)
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{
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struct intel_context *ce = &ctx->engine[engine->id];
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u64 desc;
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BUILD_BUG_ON(MAX_CONTEXT_HW_ID > (1<<GEN8_CTX_ID_WIDTH));
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desc = ctx->desc_template; /* bits 3-4 */
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desc |= engine->ctx_desc_template; /* bits 0-11 */
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desc |= i915_ggtt_offset(ce->state) + LRC_PPHWSP_PN * PAGE_SIZE;
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/* bits 12-31 */
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desc |= (u64)ctx->hw_id << GEN8_CTX_ID_SHIFT; /* bits 32-52 */
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ce->lrc_desc = desc;
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}
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uint64_t intel_lr_context_descriptor(struct i915_gem_context *ctx,
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struct intel_engine_cs *engine)
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{
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return ctx->engine[engine->id].lrc_desc;
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}
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static inline void
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execlists_context_status_change(struct drm_i915_gem_request *rq,
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unsigned long status)
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{
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/*
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* Only used when GVT-g is enabled now. When GVT-g is disabled,
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* The compiler should eliminate this function as dead-code.
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*/
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if (!IS_ENABLED(CONFIG_DRM_I915_GVT))
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return;
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atomic_notifier_call_chain(&rq->ctx->status_notifier, status, rq);
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}
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static void
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execlists_update_context_pdps(struct i915_hw_ppgtt *ppgtt, u32 *reg_state)
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{
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ASSIGN_CTX_PDP(ppgtt, reg_state, 3);
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ASSIGN_CTX_PDP(ppgtt, reg_state, 2);
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ASSIGN_CTX_PDP(ppgtt, reg_state, 1);
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ASSIGN_CTX_PDP(ppgtt, reg_state, 0);
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}
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static u64 execlists_update_context(struct drm_i915_gem_request *rq)
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{
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struct intel_context *ce = &rq->ctx->engine[rq->engine->id];
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struct i915_hw_ppgtt *ppgtt = rq->ctx->ppgtt;
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u32 *reg_state = ce->lrc_reg_state;
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reg_state[CTX_RING_TAIL+1] = intel_ring_offset(rq->ring, rq->tail);
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/* True 32b PPGTT with dynamic page allocation: update PDP
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* registers and point the unallocated PDPs to scratch page.
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* PML4 is allocated during ppgtt init, so this is not needed
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* in 48-bit mode.
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*/
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if (ppgtt && !USES_FULL_48BIT_PPGTT(ppgtt->base.dev))
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execlists_update_context_pdps(ppgtt, reg_state);
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return ce->lrc_desc;
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}
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static void execlists_submit_ports(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
struct execlist_port *port = engine->execlist_port;
|
|
u32 __iomem *elsp =
|
|
dev_priv->regs + i915_mmio_reg_offset(RING_ELSP(engine));
|
|
u64 desc[2];
|
|
|
|
if (!port[0].count)
|
|
execlists_context_status_change(port[0].request,
|
|
INTEL_CONTEXT_SCHEDULE_IN);
|
|
desc[0] = execlists_update_context(port[0].request);
|
|
engine->preempt_wa = port[0].count++; /* bdw only? fixed on skl? */
|
|
|
|
if (port[1].request) {
|
|
GEM_BUG_ON(port[1].count);
|
|
execlists_context_status_change(port[1].request,
|
|
INTEL_CONTEXT_SCHEDULE_IN);
|
|
desc[1] = execlists_update_context(port[1].request);
|
|
port[1].count = 1;
|
|
} else {
|
|
desc[1] = 0;
|
|
}
|
|
GEM_BUG_ON(desc[0] == desc[1]);
|
|
|
|
/* You must always write both descriptors in the order below. */
|
|
writel(upper_32_bits(desc[1]), elsp);
|
|
writel(lower_32_bits(desc[1]), elsp);
|
|
|
|
writel(upper_32_bits(desc[0]), elsp);
|
|
/* The context is automatically loaded after the following */
|
|
writel(lower_32_bits(desc[0]), elsp);
|
|
}
|
|
|
|
static bool ctx_single_port_submission(const struct i915_gem_context *ctx)
|
|
{
|
|
return (IS_ENABLED(CONFIG_DRM_I915_GVT) &&
|
|
ctx->execlists_force_single_submission);
|
|
}
|
|
|
|
static bool can_merge_ctx(const struct i915_gem_context *prev,
|
|
const struct i915_gem_context *next)
|
|
{
|
|
if (prev != next)
|
|
return false;
|
|
|
|
if (ctx_single_port_submission(prev))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static void execlists_dequeue(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_gem_request *cursor, *last;
|
|
struct execlist_port *port = engine->execlist_port;
|
|
bool submit = false;
|
|
|
|
last = port->request;
|
|
if (last)
|
|
/* WaIdleLiteRestore:bdw,skl
|
|
* Apply the wa NOOPs to prevent ring:HEAD == req:TAIL
|
|
* as we resubmit the request. See gen8_emit_request()
|
|
* for where we prepare the padding after the end of the
|
|
* request.
|
|
*/
|
|
last->tail = last->wa_tail;
|
|
|
|
GEM_BUG_ON(port[1].request);
|
|
|
|
/* Hardware submission is through 2 ports. Conceptually each port
|
|
* has a (RING_START, RING_HEAD, RING_TAIL) tuple. RING_START is
|
|
* static for a context, and unique to each, so we only execute
|
|
* requests belonging to a single context from each ring. RING_HEAD
|
|
* is maintained by the CS in the context image, it marks the place
|
|
* where it got up to last time, and through RING_TAIL we tell the CS
|
|
* where we want to execute up to this time.
|
|
*
|
|
* In this list the requests are in order of execution. Consecutive
|
|
* requests from the same context are adjacent in the ringbuffer. We
|
|
* can combine these requests into a single RING_TAIL update:
|
|
*
|
|
* RING_HEAD...req1...req2
|
|
* ^- RING_TAIL
|
|
* since to execute req2 the CS must first execute req1.
|
|
*
|
|
* Our goal then is to point each port to the end of a consecutive
|
|
* sequence of requests as being the most optimal (fewest wake ups
|
|
* and context switches) submission.
|
|
*/
|
|
|
|
spin_lock(&engine->execlist_lock);
|
|
list_for_each_entry(cursor, &engine->execlist_queue, execlist_link) {
|
|
/* Can we combine this request with the current port? It has to
|
|
* be the same context/ringbuffer and not have any exceptions
|
|
* (e.g. GVT saying never to combine contexts).
|
|
*
|
|
* If we can combine the requests, we can execute both by
|
|
* updating the RING_TAIL to point to the end of the second
|
|
* request, and so we never need to tell the hardware about
|
|
* the first.
|
|
*/
|
|
if (last && !can_merge_ctx(cursor->ctx, last->ctx)) {
|
|
/* If we are on the second port and cannot combine
|
|
* this request with the last, then we are done.
|
|
*/
|
|
if (port != engine->execlist_port)
|
|
break;
|
|
|
|
/* If GVT overrides us we only ever submit port[0],
|
|
* leaving port[1] empty. Note that we also have
|
|
* to be careful that we don't queue the same
|
|
* context (even though a different request) to
|
|
* the second port.
|
|
*/
|
|
if (ctx_single_port_submission(cursor->ctx))
|
|
break;
|
|
|
|
GEM_BUG_ON(last->ctx == cursor->ctx);
|
|
|
|
i915_gem_request_assign(&port->request, last);
|
|
port++;
|
|
}
|
|
last = cursor;
|
|
submit = true;
|
|
}
|
|
if (submit) {
|
|
/* Decouple all the requests submitted from the queue */
|
|
engine->execlist_queue.next = &cursor->execlist_link;
|
|
cursor->execlist_link.prev = &engine->execlist_queue;
|
|
|
|
i915_gem_request_assign(&port->request, last);
|
|
}
|
|
spin_unlock(&engine->execlist_lock);
|
|
|
|
if (submit)
|
|
execlists_submit_ports(engine);
|
|
}
|
|
|
|
static bool execlists_elsp_idle(struct intel_engine_cs *engine)
|
|
{
|
|
return !engine->execlist_port[0].request;
|
|
}
|
|
|
|
static bool execlists_elsp_ready(struct intel_engine_cs *engine)
|
|
{
|
|
int port;
|
|
|
|
port = 1; /* wait for a free slot */
|
|
if (engine->disable_lite_restore_wa || engine->preempt_wa)
|
|
port = 0; /* wait for GPU to be idle before continuing */
|
|
|
|
return !engine->execlist_port[port].request;
|
|
}
|
|
|
|
/*
|
|
* Check the unread Context Status Buffers and manage the submission of new
|
|
* contexts to the ELSP accordingly.
|
|
*/
|
|
static void intel_lrc_irq_handler(unsigned long data)
|
|
{
|
|
struct intel_engine_cs *engine = (struct intel_engine_cs *)data;
|
|
struct execlist_port *port = engine->execlist_port;
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
|
|
intel_uncore_forcewake_get(dev_priv, engine->fw_domains);
|
|
|
|
if (!execlists_elsp_idle(engine)) {
|
|
u32 __iomem *csb_mmio =
|
|
dev_priv->regs + i915_mmio_reg_offset(RING_CONTEXT_STATUS_PTR(engine));
|
|
u32 __iomem *buf =
|
|
dev_priv->regs + i915_mmio_reg_offset(RING_CONTEXT_STATUS_BUF_LO(engine, 0));
|
|
unsigned int csb, head, tail;
|
|
|
|
csb = readl(csb_mmio);
|
|
head = GEN8_CSB_READ_PTR(csb);
|
|
tail = GEN8_CSB_WRITE_PTR(csb);
|
|
if (tail < head)
|
|
tail += GEN8_CSB_ENTRIES;
|
|
while (head < tail) {
|
|
unsigned int idx = ++head % GEN8_CSB_ENTRIES;
|
|
unsigned int status = readl(buf + 2 * idx);
|
|
|
|
if (!(status & GEN8_CTX_STATUS_COMPLETED_MASK))
|
|
continue;
|
|
|
|
GEM_BUG_ON(port[0].count == 0);
|
|
if (--port[0].count == 0) {
|
|
GEM_BUG_ON(status & GEN8_CTX_STATUS_PREEMPTED);
|
|
execlists_context_status_change(port[0].request,
|
|
INTEL_CONTEXT_SCHEDULE_OUT);
|
|
|
|
i915_gem_request_put(port[0].request);
|
|
port[0] = port[1];
|
|
memset(&port[1], 0, sizeof(port[1]));
|
|
|
|
engine->preempt_wa = false;
|
|
}
|
|
|
|
GEM_BUG_ON(port[0].count == 0 &&
|
|
!(status & GEN8_CTX_STATUS_ACTIVE_IDLE));
|
|
}
|
|
|
|
writel(_MASKED_FIELD(GEN8_CSB_READ_PTR_MASK,
|
|
GEN8_CSB_WRITE_PTR(csb) << 8),
|
|
csb_mmio);
|
|
}
|
|
|
|
if (execlists_elsp_ready(engine))
|
|
execlists_dequeue(engine);
|
|
|
|
intel_uncore_forcewake_put(dev_priv, engine->fw_domains);
|
|
}
|
|
|
|
static void execlists_submit_request(struct drm_i915_gem_request *request)
|
|
{
|
|
struct intel_engine_cs *engine = request->engine;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&engine->execlist_lock, flags);
|
|
|
|
list_add_tail(&request->execlist_link, &engine->execlist_queue);
|
|
if (execlists_elsp_idle(engine))
|
|
tasklet_hi_schedule(&engine->irq_tasklet);
|
|
|
|
spin_unlock_irqrestore(&engine->execlist_lock, flags);
|
|
}
|
|
|
|
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->ring = ce->ring;
|
|
|
|
ret = intel_lr_context_pin(request->ctx, engine);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (i915.enable_guc_submission) {
|
|
/*
|
|
* Check that the GuC has space for the request before
|
|
* going any further, as the i915_add_request() call
|
|
* later on mustn't fail ...
|
|
*/
|
|
ret = i915_guc_wq_reserve(request);
|
|
if (ret)
|
|
goto err_unpin;
|
|
}
|
|
|
|
ret = intel_ring_begin(request, 0);
|
|
if (ret)
|
|
goto err_unreserve;
|
|
|
|
if (!ce->initialised) {
|
|
ret = engine->init_context(request);
|
|
if (ret)
|
|
goto err_unreserve;
|
|
|
|
ce->initialised = true;
|
|
}
|
|
|
|
/* Note that after this point, we have committed to using
|
|
* this request as it is being used to both track the
|
|
* state of engine initialisation and liveness of the
|
|
* golden renderstate above. Think twice before you try
|
|
* to cancel/unwind this request now.
|
|
*/
|
|
|
|
request->reserved_space -= EXECLISTS_REQUEST_SIZE;
|
|
return 0;
|
|
|
|
err_unreserve:
|
|
if (i915.enable_guc_submission)
|
|
i915_guc_wq_unreserve(request);
|
|
err_unpin:
|
|
intel_lr_context_unpin(request->ctx, engine);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* intel_logical_ring_advance() - advance the tail and prepare for submission
|
|
* @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(struct drm_i915_gem_request *request)
|
|
{
|
|
struct intel_ring *ring = request->ring;
|
|
struct intel_engine_cs *engine = request->engine;
|
|
|
|
intel_ring_advance(ring);
|
|
request->tail = ring->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_ring_emit(ring, MI_NOOP);
|
|
intel_ring_emit(ring, MI_NOOP);
|
|
intel_ring_advance(ring);
|
|
request->wa_tail = ring->tail;
|
|
|
|
/* 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;
|
|
return 0;
|
|
}
|
|
|
|
static int intel_lr_context_pin(struct i915_gem_context *ctx,
|
|
struct intel_engine_cs *engine)
|
|
{
|
|
struct intel_context *ce = &ctx->engine[engine->id];
|
|
void *vaddr;
|
|
int ret;
|
|
|
|
lockdep_assert_held(&ctx->i915->drm.struct_mutex);
|
|
|
|
if (ce->pin_count++)
|
|
return 0;
|
|
|
|
ret = i915_vma_pin(ce->state, 0, GEN8_LR_CONTEXT_ALIGN,
|
|
PIN_OFFSET_BIAS | GUC_WOPCM_TOP | PIN_GLOBAL);
|
|
if (ret)
|
|
goto err;
|
|
|
|
vaddr = i915_gem_object_pin_map(ce->state->obj, I915_MAP_WB);
|
|
if (IS_ERR(vaddr)) {
|
|
ret = PTR_ERR(vaddr);
|
|
goto unpin_vma;
|
|
}
|
|
|
|
ret = intel_ring_pin(ce->ring);
|
|
if (ret)
|
|
goto unpin_map;
|
|
|
|
intel_lr_context_descriptor_update(ctx, engine);
|
|
|
|
ce->lrc_reg_state = vaddr + LRC_STATE_PN * PAGE_SIZE;
|
|
ce->lrc_reg_state[CTX_RING_BUFFER_START+1] =
|
|
i915_ggtt_offset(ce->ring->vma);
|
|
|
|
ce->state->obj->dirty = true;
|
|
|
|
/* Invalidate GuC TLB. */
|
|
if (i915.enable_guc_submission) {
|
|
struct drm_i915_private *dev_priv = ctx->i915;
|
|
I915_WRITE(GEN8_GTCR, GEN8_GTCR_INVALIDATE);
|
|
}
|
|
|
|
i915_gem_context_get(ctx);
|
|
return 0;
|
|
|
|
unpin_map:
|
|
i915_gem_object_unpin_map(ce->state->obj);
|
|
unpin_vma:
|
|
__i915_vma_unpin(ce->state);
|
|
err:
|
|
ce->pin_count = 0;
|
|
return ret;
|
|
}
|
|
|
|
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->drm.struct_mutex);
|
|
GEM_BUG_ON(ce->pin_count == 0);
|
|
|
|
if (--ce->pin_count)
|
|
return;
|
|
|
|
intel_ring_unpin(ce->ring);
|
|
|
|
i915_gem_object_unpin_map(ce->state->obj);
|
|
i915_vma_unpin(ce->state);
|
|
|
|
i915_gem_context_put(ctx);
|
|
}
|
|
|
|
static int intel_logical_ring_workarounds_emit(struct drm_i915_gem_request *req)
|
|
{
|
|
int ret, i;
|
|
struct intel_ring *ring = req->ring;
|
|
struct i915_workarounds *w = &req->i915->workarounds;
|
|
|
|
if (w->count == 0)
|
|
return 0;
|
|
|
|
ret = req->engine->emit_flush(req, EMIT_BARRIER);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = intel_ring_begin(req, w->count * 2 + 2);
|
|
if (ret)
|
|
return ret;
|
|
|
|
intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(w->count));
|
|
for (i = 0; i < w->count; i++) {
|
|
intel_ring_emit_reg(ring, w->reg[i].addr);
|
|
intel_ring_emit(ring, w->reg[i].value);
|
|
}
|
|
intel_ring_emit(ring, MI_NOOP);
|
|
|
|
intel_ring_advance(ring);
|
|
|
|
ret = req->engine->emit_flush(req, EMIT_BARRIER);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define wa_ctx_emit(batch, index, cmd) \
|
|
do { \
|
|
int __index = (index)++; \
|
|
if (WARN_ON(__index >= (PAGE_SIZE / sizeof(uint32_t)))) { \
|
|
return -ENOSPC; \
|
|
} \
|
|
batch[__index] = (cmd); \
|
|
} while (0)
|
|
|
|
#define wa_ctx_emit_reg(batch, index, reg) \
|
|
wa_ctx_emit((batch), (index), i915_mmio_reg_offset(reg))
|
|
|
|
/*
|
|
* In this WA we need to set GEN8_L3SQCREG4[21:21] and reset it after
|
|
* PIPE_CONTROL instruction. This is required for the flush to happen correctly
|
|
* but there is a slight complication as this is applied in WA batch where the
|
|
* values are only initialized once so we cannot take register value at the
|
|
* beginning and reuse it further; hence we save its value to memory, upload a
|
|
* constant value with bit21 set and then we restore it back with the saved value.
|
|
* To simplify the WA, a constant value is formed by using the default value
|
|
* of this register. This shouldn't be a problem because we are only modifying
|
|
* it for a short period and this batch in non-premptible. We can ofcourse
|
|
* use additional instructions that read the actual value of the register
|
|
* at that time and set our bit of interest but it makes the WA complicated.
|
|
*
|
|
* This WA is also required for Gen9 so extracting as a function avoids
|
|
* code duplication.
|
|
*/
|
|
static inline int gen8_emit_flush_coherentl3_wa(struct intel_engine_cs *engine,
|
|
uint32_t *batch,
|
|
uint32_t index)
|
|
{
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
uint32_t l3sqc4_flush = (0x40400000 | GEN8_LQSC_FLUSH_COHERENT_LINES);
|
|
|
|
/*
|
|
* WaDisableLSQCROPERFforOCL: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_KBL_REVID(dev_priv, 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, i915_ggtt_offset(engine->scratch) + 256);
|
|
wa_ctx_emit(batch, index, 0);
|
|
|
|
wa_ctx_emit(batch, index, MI_LOAD_REGISTER_IMM(1));
|
|
wa_ctx_emit_reg(batch, index, GEN8_L3SQCREG4);
|
|
wa_ctx_emit(batch, index, l3sqc4_flush);
|
|
|
|
wa_ctx_emit(batch, index, GFX_OP_PIPE_CONTROL(6));
|
|
wa_ctx_emit(batch, index, (PIPE_CONTROL_CS_STALL |
|
|
PIPE_CONTROL_DC_FLUSH_ENABLE));
|
|
wa_ctx_emit(batch, index, 0);
|
|
wa_ctx_emit(batch, index, 0);
|
|
wa_ctx_emit(batch, index, 0);
|
|
wa_ctx_emit(batch, index, 0);
|
|
|
|
wa_ctx_emit(batch, index, (MI_LOAD_REGISTER_MEM_GEN8 |
|
|
MI_SRM_LRM_GLOBAL_GTT));
|
|
wa_ctx_emit_reg(batch, index, GEN8_L3SQCREG4);
|
|
wa_ctx_emit(batch, index, i915_ggtt_offset(engine->scratch) + 256);
|
|
wa_ctx_emit(batch, index, 0);
|
|
|
|
return index;
|
|
}
|
|
|
|
static inline uint32_t wa_ctx_start(struct i915_wa_ctx_bb *wa_ctx,
|
|
uint32_t offset,
|
|
uint32_t start_alignment)
|
|
{
|
|
return wa_ctx->offset = ALIGN(offset, start_alignment);
|
|
}
|
|
|
|
static inline int wa_ctx_end(struct i915_wa_ctx_bb *wa_ctx,
|
|
uint32_t offset,
|
|
uint32_t size_alignment)
|
|
{
|
|
wa_ctx->size = offset - wa_ctx->offset;
|
|
|
|
WARN(wa_ctx->size % size_alignment,
|
|
"wa_ctx_bb failed sanity checks: size %d is not aligned to %d\n",
|
|
wa_ctx->size, size_alignment);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Typically we only have one indirect_ctx and per_ctx batch buffer which are
|
|
* initialized at the beginning and shared across all contexts but this field
|
|
* helps us to have multiple batches at different offsets and select them based
|
|
* on a criteria. At the moment this batch always start at the beginning of the page
|
|
* and at this point we don't have multiple wa_ctx batch buffers.
|
|
*
|
|
* The number of WA applied are not known at the beginning; we use this field
|
|
* to return the no of DWORDS written.
|
|
*
|
|
* It is to be noted that this batch does not contain MI_BATCH_BUFFER_END
|
|
* so it adds NOOPs as padding to make it cacheline aligned.
|
|
* MI_BATCH_BUFFER_END will be added to perctx batch and both of them together
|
|
* makes a complete batch buffer.
|
|
*/
|
|
static int gen8_init_indirectctx_bb(struct intel_engine_cs *engine,
|
|
struct i915_wa_ctx_bb *wa_ctx,
|
|
uint32_t *batch,
|
|
uint32_t *offset)
|
|
{
|
|
uint32_t scratch_addr;
|
|
uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);
|
|
|
|
/* WaDisableCtxRestoreArbitration:bdw,chv */
|
|
wa_ctx_emit(batch, index, MI_ARB_ON_OFF | MI_ARB_DISABLE);
|
|
|
|
/* WaFlushCoherentL3CacheLinesAtContextSwitch:bdw */
|
|
if (IS_BROADWELL(engine->i915)) {
|
|
int rc = gen8_emit_flush_coherentl3_wa(engine, batch, index);
|
|
if (rc < 0)
|
|
return rc;
|
|
index = rc;
|
|
}
|
|
|
|
/* WaClearSlmSpaceAtContextSwitch:bdw,chv */
|
|
/* Actual scratch location is at 128 bytes offset */
|
|
scratch_addr = i915_ggtt_offset(engine->scratch) + 2 * CACHELINE_BYTES;
|
|
|
|
wa_ctx_emit(batch, index, GFX_OP_PIPE_CONTROL(6));
|
|
wa_ctx_emit(batch, index, (PIPE_CONTROL_FLUSH_L3 |
|
|
PIPE_CONTROL_GLOBAL_GTT_IVB |
|
|
PIPE_CONTROL_CS_STALL |
|
|
PIPE_CONTROL_QW_WRITE));
|
|
wa_ctx_emit(batch, index, scratch_addr);
|
|
wa_ctx_emit(batch, index, 0);
|
|
wa_ctx_emit(batch, index, 0);
|
|
wa_ctx_emit(batch, index, 0);
|
|
|
|
/* Pad to end of cacheline */
|
|
while (index % CACHELINE_DWORDS)
|
|
wa_ctx_emit(batch, index, MI_NOOP);
|
|
|
|
/*
|
|
* MI_BATCH_BUFFER_END is not required in Indirect ctx BB because
|
|
* execution depends on the length specified in terms of cache lines
|
|
* in the register CTX_RCS_INDIRECT_CTX
|
|
*/
|
|
|
|
return wa_ctx_end(wa_ctx, *offset = index, CACHELINE_DWORDS);
|
|
}
|
|
|
|
/*
|
|
* This batch is started immediately after indirect_ctx batch. Since we ensure
|
|
* that indirect_ctx ends on a cacheline this batch is aligned automatically.
|
|
*
|
|
* The number of DWORDS written are returned using this field.
|
|
*
|
|
* This batch is terminated with MI_BATCH_BUFFER_END and so we need not add padding
|
|
* to align it with cacheline as padding after MI_BATCH_BUFFER_END is redundant.
|
|
*/
|
|
static int gen8_init_perctx_bb(struct intel_engine_cs *engine,
|
|
struct i915_wa_ctx_bb *wa_ctx,
|
|
uint32_t *batch,
|
|
uint32_t *offset)
|
|
{
|
|
uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);
|
|
|
|
/* WaDisableCtxRestoreArbitration:bdw,chv */
|
|
wa_ctx_emit(batch, index, MI_ARB_ON_OFF | MI_ARB_ENABLE);
|
|
|
|
wa_ctx_emit(batch, index, MI_BATCH_BUFFER_END);
|
|
|
|
return wa_ctx_end(wa_ctx, *offset = index, 1);
|
|
}
|
|
|
|
static int gen9_init_indirectctx_bb(struct intel_engine_cs *engine,
|
|
struct i915_wa_ctx_bb *wa_ctx,
|
|
uint32_t *batch,
|
|
uint32_t *offset)
|
|
{
|
|
int ret;
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);
|
|
|
|
/* WaDisableCtxRestoreArbitration:bxt */
|
|
if (IS_BXT_REVID(dev_priv, 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;
|
|
|
|
/* WaDisableGatherAtSetShaderCommonSlice:skl,bxt,kbl */
|
|
wa_ctx_emit(batch, index, MI_LOAD_REGISTER_IMM(1));
|
|
wa_ctx_emit_reg(batch, index, COMMON_SLICE_CHICKEN2);
|
|
wa_ctx_emit(batch, index, _MASKED_BIT_DISABLE(
|
|
GEN9_DISABLE_GATHER_AT_SET_SHADER_COMMON_SLICE));
|
|
wa_ctx_emit(batch, index, MI_NOOP);
|
|
|
|
/* WaClearSlmSpaceAtContextSwitch:kbl */
|
|
/* Actual scratch location is at 128 bytes offset */
|
|
if (IS_KBL_REVID(dev_priv, 0, KBL_REVID_A0)) {
|
|
u32 scratch_addr =
|
|
i915_ggtt_offset(engine->scratch) + 2 * CACHELINE_BYTES;
|
|
|
|
wa_ctx_emit(batch, index, GFX_OP_PIPE_CONTROL(6));
|
|
wa_ctx_emit(batch, index, (PIPE_CONTROL_FLUSH_L3 |
|
|
PIPE_CONTROL_GLOBAL_GTT_IVB |
|
|
PIPE_CONTROL_CS_STALL |
|
|
PIPE_CONTROL_QW_WRITE));
|
|
wa_ctx_emit(batch, index, scratch_addr);
|
|
wa_ctx_emit(batch, index, 0);
|
|
wa_ctx_emit(batch, index, 0);
|
|
wa_ctx_emit(batch, index, 0);
|
|
}
|
|
|
|
/* WaMediaPoolStateCmdInWABB:bxt */
|
|
if (HAS_POOLED_EU(engine->i915)) {
|
|
/*
|
|
* EU pool configuration is setup along with golden context
|
|
* during context initialization. This value depends on
|
|
* device type (2x6 or 3x6) and needs to be updated based
|
|
* on which subslice is disabled especially for 2x6
|
|
* devices, however it is safe to load default
|
|
* configuration of 3x6 device instead of masking off
|
|
* corresponding bits because HW ignores bits of a disabled
|
|
* subslice and drops down to appropriate config. Please
|
|
* see render_state_setup() in i915_gem_render_state.c for
|
|
* possible configurations, to avoid duplication they are
|
|
* not shown here again.
|
|
*/
|
|
u32 eu_pool_config = 0x00777000;
|
|
wa_ctx_emit(batch, index, GEN9_MEDIA_POOL_STATE);
|
|
wa_ctx_emit(batch, index, GEN9_MEDIA_POOL_ENABLE);
|
|
wa_ctx_emit(batch, index, eu_pool_config);
|
|
wa_ctx_emit(batch, index, 0);
|
|
wa_ctx_emit(batch, index, 0);
|
|
wa_ctx_emit(batch, index, 0);
|
|
}
|
|
|
|
/* Pad to end of cacheline */
|
|
while (index % CACHELINE_DWORDS)
|
|
wa_ctx_emit(batch, index, MI_NOOP);
|
|
|
|
return wa_ctx_end(wa_ctx, *offset = index, CACHELINE_DWORDS);
|
|
}
|
|
|
|
static int gen9_init_perctx_bb(struct intel_engine_cs *engine,
|
|
struct i915_wa_ctx_bb *wa_ctx,
|
|
uint32_t *batch,
|
|
uint32_t *offset)
|
|
{
|
|
uint32_t index = wa_ctx_start(wa_ctx, *offset, CACHELINE_DWORDS);
|
|
|
|
/* WaSetDisablePixMaskCammingAndRhwoInCommonSliceChicken:bxt */
|
|
if (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:bxt */
|
|
if (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)
|
|
{
|
|
struct drm_i915_gem_object *obj;
|
|
struct i915_vma *vma;
|
|
int err;
|
|
|
|
obj = i915_gem_object_create(&engine->i915->drm, PAGE_ALIGN(size));
|
|
if (IS_ERR(obj))
|
|
return PTR_ERR(obj);
|
|
|
|
vma = i915_vma_create(obj, &engine->i915->ggtt.base, NULL);
|
|
if (IS_ERR(vma)) {
|
|
err = PTR_ERR(vma);
|
|
goto err;
|
|
}
|
|
|
|
err = i915_vma_pin(vma, 0, PAGE_SIZE, PIN_GLOBAL | PIN_HIGH);
|
|
if (err)
|
|
goto err;
|
|
|
|
engine->wa_ctx.vma = vma;
|
|
return 0;
|
|
|
|
err:
|
|
i915_gem_object_put(obj);
|
|
return err;
|
|
}
|
|
|
|
static void lrc_destroy_wa_ctx_obj(struct intel_engine_cs *engine)
|
|
{
|
|
i915_vma_unpin_and_release(&engine->wa_ctx.vma);
|
|
}
|
|
|
|
static int intel_init_workaround_bb(struct intel_engine_cs *engine)
|
|
{
|
|
struct i915_ctx_workarounds *wa_ctx = &engine->wa_ctx;
|
|
uint32_t *batch;
|
|
uint32_t offset;
|
|
struct page *page;
|
|
int ret;
|
|
|
|
WARN_ON(engine->id != RCS);
|
|
|
|
/* update this when WA for higher Gen are added */
|
|
if (INTEL_GEN(engine->i915) > 9) {
|
|
DRM_ERROR("WA batch buffer is not initialized for Gen%d\n",
|
|
INTEL_GEN(engine->i915));
|
|
return 0;
|
|
}
|
|
|
|
/* some WA perform writes to scratch page, ensure it is valid */
|
|
if (!engine->scratch) {
|
|
DRM_ERROR("scratch page not allocated for %s\n", engine->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = lrc_setup_wa_ctx_obj(engine, PAGE_SIZE);
|
|
if (ret) {
|
|
DRM_DEBUG_DRIVER("Failed to setup context WA page: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
page = i915_gem_object_get_dirty_page(wa_ctx->vma->obj, 0);
|
|
batch = kmap_atomic(page);
|
|
offset = 0;
|
|
|
|
if (IS_GEN8(engine->i915)) {
|
|
ret = gen8_init_indirectctx_bb(engine,
|
|
&wa_ctx->indirect_ctx,
|
|
batch,
|
|
&offset);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = gen8_init_perctx_bb(engine,
|
|
&wa_ctx->per_ctx,
|
|
batch,
|
|
&offset);
|
|
if (ret)
|
|
goto out;
|
|
} else if (IS_GEN9(engine->i915)) {
|
|
ret = gen9_init_indirectctx_bb(engine,
|
|
&wa_ctx->indirect_ctx,
|
|
batch,
|
|
&offset);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = gen9_init_perctx_bb(engine,
|
|
&wa_ctx->per_ctx,
|
|
batch,
|
|
&offset);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
kunmap_atomic(batch);
|
|
if (ret)
|
|
lrc_destroy_wa_ctx_obj(engine);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static 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),
|
|
engine->status_page.ggtt_offset);
|
|
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;
|
|
int ret;
|
|
|
|
ret = intel_mocs_init_engine(engine);
|
|
if (ret)
|
|
return ret;
|
|
|
|
lrc_init_hws(engine);
|
|
|
|
intel_engine_reset_breadcrumbs(engine);
|
|
|
|
I915_WRITE(RING_HWSTAM(engine->mmio_base), 0xffffffff);
|
|
|
|
I915_WRITE(RING_MODE_GEN7(engine),
|
|
_MASKED_BIT_DISABLE(GFX_REPLAY_MODE) |
|
|
_MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE));
|
|
|
|
DRM_DEBUG_DRIVER("Execlists enabled for %s\n", engine->name);
|
|
|
|
intel_engine_init_hangcheck(engine);
|
|
|
|
/* After a GPU reset, we may have requests to replay */
|
|
if (!execlists_elsp_idle(engine)) {
|
|
engine->execlist_port[0].count = 0;
|
|
engine->execlist_port[1].count = 0;
|
|
execlists_submit_ports(engine);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gen8_init_render_ring(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
int ret;
|
|
|
|
ret = gen8_init_common_ring(engine);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* We need to disable the AsyncFlip performance optimisations in order
|
|
* to use MI_WAIT_FOR_EVENT within the CS. It should already be
|
|
* programmed to '1' on all products.
|
|
*
|
|
* WaDisableAsyncFlipPerfMode:snb,ivb,hsw,vlv,bdw,chv
|
|
*/
|
|
I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE));
|
|
|
|
I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_FORCE_ORDERING));
|
|
|
|
return init_workarounds_ring(engine);
|
|
}
|
|
|
|
static int gen9_init_render_ring(struct intel_engine_cs *engine)
|
|
{
|
|
int ret;
|
|
|
|
ret = gen8_init_common_ring(engine);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return init_workarounds_ring(engine);
|
|
}
|
|
|
|
static void reset_common_ring(struct intel_engine_cs *engine,
|
|
struct drm_i915_gem_request *request)
|
|
{
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
struct execlist_port *port = engine->execlist_port;
|
|
struct intel_context *ce = &request->ctx->engine[engine->id];
|
|
|
|
/* We want a simple context + ring to execute the breadcrumb update.
|
|
* We cannot rely on the context being intact across the GPU hang,
|
|
* so clear it and rebuild just what we need for the breadcrumb.
|
|
* All pending requests for this context will be zapped, and any
|
|
* future request will be after userspace has had the opportunity
|
|
* to recreate its own state.
|
|
*/
|
|
execlists_init_reg_state(ce->lrc_reg_state,
|
|
request->ctx, engine, ce->ring);
|
|
|
|
/* Move the RING_HEAD onto the breadcrumb, past the hanging batch */
|
|
ce->lrc_reg_state[CTX_RING_BUFFER_START+1] =
|
|
i915_ggtt_offset(ce->ring->vma);
|
|
ce->lrc_reg_state[CTX_RING_HEAD+1] = request->postfix;
|
|
|
|
request->ring->head = request->postfix;
|
|
request->ring->last_retired_head = -1;
|
|
intel_ring_update_space(request->ring);
|
|
|
|
if (i915.enable_guc_submission)
|
|
return;
|
|
|
|
/* Catch up with any missed context-switch interrupts */
|
|
I915_WRITE(RING_CONTEXT_STATUS_PTR(engine), _MASKED_FIELD(0xffff, 0));
|
|
if (request->ctx != port[0].request->ctx) {
|
|
i915_gem_request_put(port[0].request);
|
|
port[0] = port[1];
|
|
memset(&port[1], 0, sizeof(port[1]));
|
|
}
|
|
|
|
GEM_BUG_ON(request->ctx != port[0].request->ctx);
|
|
|
|
/* Reset WaIdleLiteRestore:bdw,skl as well */
|
|
request->tail = request->wa_tail - WA_TAIL_DWORDS * sizeof(u32);
|
|
}
|
|
|
|
static int intel_logical_ring_emit_pdps(struct drm_i915_gem_request *req)
|
|
{
|
|
struct i915_hw_ppgtt *ppgtt = req->ctx->ppgtt;
|
|
struct intel_ring *ring = req->ring;
|
|
struct intel_engine_cs *engine = req->engine;
|
|
const int num_lri_cmds = GEN8_LEGACY_PDPES * 2;
|
|
int i, ret;
|
|
|
|
ret = intel_ring_begin(req, num_lri_cmds * 2 + 2);
|
|
if (ret)
|
|
return ret;
|
|
|
|
intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(num_lri_cmds));
|
|
for (i = GEN8_LEGACY_PDPES - 1; i >= 0; i--) {
|
|
const dma_addr_t pd_daddr = i915_page_dir_dma_addr(ppgtt, i);
|
|
|
|
intel_ring_emit_reg(ring, GEN8_RING_PDP_UDW(engine, i));
|
|
intel_ring_emit(ring, upper_32_bits(pd_daddr));
|
|
intel_ring_emit_reg(ring, GEN8_RING_PDP_LDW(engine, i));
|
|
intel_ring_emit(ring, lower_32_bits(pd_daddr));
|
|
}
|
|
|
|
intel_ring_emit(ring, MI_NOOP);
|
|
intel_ring_advance(ring);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gen8_emit_bb_start(struct drm_i915_gem_request *req,
|
|
u64 offset, u32 len,
|
|
unsigned int dispatch_flags)
|
|
{
|
|
struct intel_ring *ring = req->ring;
|
|
bool ppgtt = !(dispatch_flags & I915_DISPATCH_SECURE);
|
|
int ret;
|
|
|
|
/* Don't rely in hw updating PDPs, specially in lite-restore.
|
|
* Ideally, we should set Force PD Restore in ctx descriptor,
|
|
* but we can't. Force Restore would be a second option, but
|
|
* it is unsafe in case of lite-restore (because the ctx is
|
|
* not idle). PML4 is allocated during ppgtt init so this is
|
|
* not needed in 48-bit.*/
|
|
if (req->ctx->ppgtt &&
|
|
(intel_engine_flag(req->engine) & req->ctx->ppgtt->pd_dirty_rings)) {
|
|
if (!USES_FULL_48BIT_PPGTT(req->i915) &&
|
|
!intel_vgpu_active(req->i915)) {
|
|
ret = intel_logical_ring_emit_pdps(req);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
req->ctx->ppgtt->pd_dirty_rings &= ~intel_engine_flag(req->engine);
|
|
}
|
|
|
|
ret = intel_ring_begin(req, 4);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* FIXME(BDW): Address space and security selectors. */
|
|
intel_ring_emit(ring, MI_BATCH_BUFFER_START_GEN8 |
|
|
(ppgtt<<8) |
|
|
(dispatch_flags & I915_DISPATCH_RS ?
|
|
MI_BATCH_RESOURCE_STREAMER : 0));
|
|
intel_ring_emit(ring, lower_32_bits(offset));
|
|
intel_ring_emit(ring, upper_32_bits(offset));
|
|
intel_ring_emit(ring, MI_NOOP);
|
|
intel_ring_advance(ring);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void gen8_logical_ring_enable_irq(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
I915_WRITE_IMR(engine,
|
|
~(engine->irq_enable_mask | engine->irq_keep_mask));
|
|
POSTING_READ_FW(RING_IMR(engine->mmio_base));
|
|
}
|
|
|
|
static void gen8_logical_ring_disable_irq(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
I915_WRITE_IMR(engine, ~engine->irq_keep_mask);
|
|
}
|
|
|
|
static int gen8_emit_flush(struct drm_i915_gem_request *request, u32 mode)
|
|
{
|
|
struct intel_ring *ring = request->ring;
|
|
u32 cmd;
|
|
int ret;
|
|
|
|
ret = intel_ring_begin(request, 4);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cmd = MI_FLUSH_DW + 1;
|
|
|
|
/* We always require a command barrier so that subsequent
|
|
* commands, such as breadcrumb interrupts, are strictly ordered
|
|
* wrt the contents of the write cache being flushed to memory
|
|
* (and thus being coherent from the CPU).
|
|
*/
|
|
cmd |= MI_FLUSH_DW_STORE_INDEX | MI_FLUSH_DW_OP_STOREDW;
|
|
|
|
if (mode & EMIT_INVALIDATE) {
|
|
cmd |= MI_INVALIDATE_TLB;
|
|
if (request->engine->id == VCS)
|
|
cmd |= MI_INVALIDATE_BSD;
|
|
}
|
|
|
|
intel_ring_emit(ring, cmd);
|
|
intel_ring_emit(ring,
|
|
I915_GEM_HWS_SCRATCH_ADDR |
|
|
MI_FLUSH_DW_USE_GTT);
|
|
intel_ring_emit(ring, 0); /* upper addr */
|
|
intel_ring_emit(ring, 0); /* value */
|
|
intel_ring_advance(ring);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gen8_emit_flush_render(struct drm_i915_gem_request *request,
|
|
u32 mode)
|
|
{
|
|
struct intel_ring *ring = request->ring;
|
|
struct intel_engine_cs *engine = request->engine;
|
|
u32 scratch_addr =
|
|
i915_ggtt_offset(engine->scratch) + 2 * CACHELINE_BYTES;
|
|
bool vf_flush_wa = false, dc_flush_wa = false;
|
|
u32 flags = 0;
|
|
int ret;
|
|
int len;
|
|
|
|
flags |= PIPE_CONTROL_CS_STALL;
|
|
|
|
if (mode & EMIT_FLUSH) {
|
|
flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
|
|
flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
|
|
flags |= PIPE_CONTROL_DC_FLUSH_ENABLE;
|
|
flags |= PIPE_CONTROL_FLUSH_ENABLE;
|
|
}
|
|
|
|
if (mode & EMIT_INVALIDATE) {
|
|
flags |= PIPE_CONTROL_TLB_INVALIDATE;
|
|
flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
|
|
flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
|
|
flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
|
|
flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
|
|
flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
|
|
flags |= PIPE_CONTROL_QW_WRITE;
|
|
flags |= PIPE_CONTROL_GLOBAL_GTT_IVB;
|
|
|
|
/*
|
|
* On GEN9: before VF_CACHE_INVALIDATE we need to emit a NULL
|
|
* pipe control.
|
|
*/
|
|
if (IS_GEN9(request->i915))
|
|
vf_flush_wa = true;
|
|
|
|
/* WaForGAMHang:kbl */
|
|
if (IS_KBL_REVID(request->i915, 0, KBL_REVID_B0))
|
|
dc_flush_wa = true;
|
|
}
|
|
|
|
len = 6;
|
|
|
|
if (vf_flush_wa)
|
|
len += 6;
|
|
|
|
if (dc_flush_wa)
|
|
len += 12;
|
|
|
|
ret = intel_ring_begin(request, len);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (vf_flush_wa) {
|
|
intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(6));
|
|
intel_ring_emit(ring, 0);
|
|
intel_ring_emit(ring, 0);
|
|
intel_ring_emit(ring, 0);
|
|
intel_ring_emit(ring, 0);
|
|
intel_ring_emit(ring, 0);
|
|
}
|
|
|
|
if (dc_flush_wa) {
|
|
intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(6));
|
|
intel_ring_emit(ring, PIPE_CONTROL_DC_FLUSH_ENABLE);
|
|
intel_ring_emit(ring, 0);
|
|
intel_ring_emit(ring, 0);
|
|
intel_ring_emit(ring, 0);
|
|
intel_ring_emit(ring, 0);
|
|
}
|
|
|
|
intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(6));
|
|
intel_ring_emit(ring, flags);
|
|
intel_ring_emit(ring, scratch_addr);
|
|
intel_ring_emit(ring, 0);
|
|
intel_ring_emit(ring, 0);
|
|
intel_ring_emit(ring, 0);
|
|
|
|
if (dc_flush_wa) {
|
|
intel_ring_emit(ring, GFX_OP_PIPE_CONTROL(6));
|
|
intel_ring_emit(ring, PIPE_CONTROL_CS_STALL);
|
|
intel_ring_emit(ring, 0);
|
|
intel_ring_emit(ring, 0);
|
|
intel_ring_emit(ring, 0);
|
|
intel_ring_emit(ring, 0);
|
|
}
|
|
|
|
intel_ring_advance(ring);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Reserve space for 2 NOOPs at the end of each request to be
|
|
* used as a workaround for not being allowed to do lite
|
|
* restore with HEAD==TAIL (WaIdleLiteRestore).
|
|
*/
|
|
|
|
static int gen8_emit_request(struct drm_i915_gem_request *request)
|
|
{
|
|
struct intel_ring *ring = request->ring;
|
|
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_ring_emit(ring, (MI_FLUSH_DW + 1) | MI_FLUSH_DW_OP_STOREDW);
|
|
intel_ring_emit(ring,
|
|
intel_hws_seqno_address(request->engine) |
|
|
MI_FLUSH_DW_USE_GTT);
|
|
intel_ring_emit(ring, 0);
|
|
intel_ring_emit(ring, request->fence.seqno);
|
|
intel_ring_emit(ring, MI_USER_INTERRUPT);
|
|
intel_ring_emit(ring, MI_NOOP);
|
|
return intel_logical_ring_advance(request);
|
|
}
|
|
|
|
static int gen8_emit_request_render(struct drm_i915_gem_request *request)
|
|
{
|
|
struct intel_ring *ring = request->ring;
|
|
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_ring_emit(ring, GFX_OP_PIPE_CONTROL(6));
|
|
intel_ring_emit(ring,
|
|
(PIPE_CONTROL_GLOBAL_GTT_IVB |
|
|
PIPE_CONTROL_CS_STALL |
|
|
PIPE_CONTROL_QW_WRITE));
|
|
intel_ring_emit(ring, intel_hws_seqno_address(request->engine));
|
|
intel_ring_emit(ring, 0);
|
|
intel_ring_emit(ring, i915_gem_request_get_seqno(request));
|
|
/* We're thrashing one dword of HWS. */
|
|
intel_ring_emit(ring, 0);
|
|
intel_ring_emit(ring, MI_USER_INTERRUPT);
|
|
intel_ring_emit(ring, MI_NOOP);
|
|
return intel_logical_ring_advance(request);
|
|
}
|
|
|
|
static int gen8_init_rcs_context(struct drm_i915_gem_request *req)
|
|
{
|
|
int ret;
|
|
|
|
ret = intel_logical_ring_workarounds_emit(req);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = intel_rcs_context_init_mocs(req);
|
|
/*
|
|
* Failing to program the MOCS is non-fatal.The system will not
|
|
* run at peak performance. So generate an error and carry on.
|
|
*/
|
|
if (ret)
|
|
DRM_ERROR("MOCS failed to program: expect performance issues.\n");
|
|
|
|
return i915_gem_render_state_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;
|
|
|
|
/*
|
|
* Tasklet cannot be active at this point due intel_mark_active/idle
|
|
* so this is just for documentation.
|
|
*/
|
|
if (WARN_ON(test_bit(TASKLET_STATE_SCHED, &engine->irq_tasklet.state)))
|
|
tasklet_kill(&engine->irq_tasklet);
|
|
|
|
dev_priv = engine->i915;
|
|
|
|
if (engine->buffer) {
|
|
WARN_ON((I915_READ_MODE(engine) & MODE_IDLE) == 0);
|
|
}
|
|
|
|
if (engine->cleanup)
|
|
engine->cleanup(engine);
|
|
|
|
intel_engine_cleanup_common(engine);
|
|
|
|
if (engine->status_page.vma) {
|
|
i915_gem_object_unpin_map(engine->status_page.vma->obj);
|
|
engine->status_page.vma = NULL;
|
|
}
|
|
intel_lr_context_unpin(dev_priv->kernel_context, engine);
|
|
|
|
lrc_destroy_wa_ctx_obj(engine);
|
|
engine->i915 = NULL;
|
|
dev_priv->engine[engine->id] = NULL;
|
|
kfree(engine);
|
|
}
|
|
|
|
void intel_execlists_enable_submission(struct drm_i915_private *dev_priv)
|
|
{
|
|
struct intel_engine_cs *engine;
|
|
enum intel_engine_id id;
|
|
|
|
for_each_engine(engine, dev_priv, id)
|
|
engine->submit_request = execlists_submit_request;
|
|
}
|
|
|
|
static void
|
|
logical_ring_default_vfuncs(struct intel_engine_cs *engine)
|
|
{
|
|
/* Default vfuncs which can be overriden by each engine. */
|
|
engine->init_hw = gen8_init_common_ring;
|
|
engine->reset_hw = reset_common_ring;
|
|
engine->emit_flush = gen8_emit_flush;
|
|
engine->emit_request = gen8_emit_request;
|
|
engine->submit_request = execlists_submit_request;
|
|
|
|
engine->irq_enable = gen8_logical_ring_enable_irq;
|
|
engine->irq_disable = gen8_logical_ring_disable_irq;
|
|
engine->emit_bb_start = gen8_emit_bb_start;
|
|
if (IS_BXT_REVID(engine->i915, 0, BXT_REVID_A1))
|
|
engine->irq_seqno_barrier = bxt_a_seqno_barrier;
|
|
}
|
|
|
|
static inline void
|
|
logical_ring_default_irqs(struct intel_engine_cs *engine)
|
|
{
|
|
unsigned shift = engine->irq_shift;
|
|
engine->irq_enable_mask = GT_RENDER_USER_INTERRUPT << shift;
|
|
engine->irq_keep_mask = GT_CONTEXT_SWITCH_INTERRUPT << shift;
|
|
}
|
|
|
|
static int
|
|
lrc_setup_hws(struct intel_engine_cs *engine, struct i915_vma *vma)
|
|
{
|
|
const int hws_offset = LRC_PPHWSP_PN * PAGE_SIZE;
|
|
void *hws;
|
|
|
|
/* The HWSP is part of the default context object in LRC mode. */
|
|
hws = i915_gem_object_pin_map(vma->obj, I915_MAP_WB);
|
|
if (IS_ERR(hws))
|
|
return PTR_ERR(hws);
|
|
|
|
engine->status_page.page_addr = hws + hws_offset;
|
|
engine->status_page.ggtt_offset = i915_ggtt_offset(vma) + hws_offset;
|
|
engine->status_page.vma = vma;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
logical_ring_setup(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
enum forcewake_domains fw_domains;
|
|
|
|
intel_engine_setup_common(engine);
|
|
|
|
/* Intentionally left blank. */
|
|
engine->buffer = NULL;
|
|
|
|
fw_domains = intel_uncore_forcewake_for_reg(dev_priv,
|
|
RING_ELSP(engine),
|
|
FW_REG_WRITE);
|
|
|
|
fw_domains |= intel_uncore_forcewake_for_reg(dev_priv,
|
|
RING_CONTEXT_STATUS_PTR(engine),
|
|
FW_REG_READ | FW_REG_WRITE);
|
|
|
|
fw_domains |= intel_uncore_forcewake_for_reg(dev_priv,
|
|
RING_CONTEXT_STATUS_BUF_BASE(engine),
|
|
FW_REG_READ);
|
|
|
|
engine->fw_domains = fw_domains;
|
|
|
|
tasklet_init(&engine->irq_tasklet,
|
|
intel_lrc_irq_handler, (unsigned long)engine);
|
|
|
|
logical_ring_init_platform_invariants(engine);
|
|
logical_ring_default_vfuncs(engine);
|
|
logical_ring_default_irqs(engine);
|
|
}
|
|
|
|
static int
|
|
logical_ring_init(struct intel_engine_cs *engine)
|
|
{
|
|
struct i915_gem_context *dctx = engine->i915->kernel_context;
|
|
int ret;
|
|
|
|
ret = intel_engine_init_common(engine);
|
|
if (ret)
|
|
goto error;
|
|
|
|
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;
|
|
}
|
|
|
|
int logical_render_ring_init(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
int ret;
|
|
|
|
logical_ring_setup(engine);
|
|
|
|
if (HAS_L3_DPF(dev_priv))
|
|
engine->irq_keep_mask |= GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
|
|
|
|
/* Override some for render ring. */
|
|
if (INTEL_GEN(dev_priv) >= 9)
|
|
engine->init_hw = gen9_init_render_ring;
|
|
else
|
|
engine->init_hw = gen8_init_render_ring;
|
|
engine->init_context = gen8_init_rcs_context;
|
|
engine->emit_flush = gen8_emit_flush_render;
|
|
engine->emit_request = gen8_emit_request_render;
|
|
|
|
ret = intel_engine_create_scratch(engine, 4096);
|
|
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;
|
|
}
|
|
|
|
int logical_xcs_ring_init(struct intel_engine_cs *engine)
|
|
{
|
|
logical_ring_setup(engine);
|
|
|
|
return logical_ring_init(engine);
|
|
}
|
|
|
|
static u32
|
|
make_rpcs(struct drm_i915_private *dev_priv)
|
|
{
|
|
u32 rpcs = 0;
|
|
|
|
/*
|
|
* No explicit RPCS request is needed to ensure full
|
|
* slice/subslice/EU enablement prior to Gen9.
|
|
*/
|
|
if (INTEL_GEN(dev_priv) < 9)
|
|
return 0;
|
|
|
|
/*
|
|
* Starting in Gen9, render power gating can leave
|
|
* slice/subslice/EU in a partially enabled state. We
|
|
* must make an explicit request through RPCS for full
|
|
* enablement.
|
|
*/
|
|
if (INTEL_INFO(dev_priv)->sseu.has_slice_pg) {
|
|
rpcs |= GEN8_RPCS_S_CNT_ENABLE;
|
|
rpcs |= hweight8(INTEL_INFO(dev_priv)->sseu.slice_mask) <<
|
|
GEN8_RPCS_S_CNT_SHIFT;
|
|
rpcs |= GEN8_RPCS_ENABLE;
|
|
}
|
|
|
|
if (INTEL_INFO(dev_priv)->sseu.has_subslice_pg) {
|
|
rpcs |= GEN8_RPCS_SS_CNT_ENABLE;
|
|
rpcs |= hweight8(INTEL_INFO(dev_priv)->sseu.subslice_mask) <<
|
|
GEN8_RPCS_SS_CNT_SHIFT;
|
|
rpcs |= GEN8_RPCS_ENABLE;
|
|
}
|
|
|
|
if (INTEL_INFO(dev_priv)->sseu.has_eu_pg) {
|
|
rpcs |= INTEL_INFO(dev_priv)->sseu.eu_per_subslice <<
|
|
GEN8_RPCS_EU_MIN_SHIFT;
|
|
rpcs |= INTEL_INFO(dev_priv)->sseu.eu_per_subslice <<
|
|
GEN8_RPCS_EU_MAX_SHIFT;
|
|
rpcs |= GEN8_RPCS_ENABLE;
|
|
}
|
|
|
|
return rpcs;
|
|
}
|
|
|
|
static u32 intel_lr_indirect_ctx_offset(struct intel_engine_cs *engine)
|
|
{
|
|
u32 indirect_ctx_offset;
|
|
|
|
switch (INTEL_GEN(engine->i915)) {
|
|
default:
|
|
MISSING_CASE(INTEL_GEN(engine->i915));
|
|
/* fall through */
|
|
case 9:
|
|
indirect_ctx_offset =
|
|
GEN9_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT;
|
|
break;
|
|
case 8:
|
|
indirect_ctx_offset =
|
|
GEN8_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT;
|
|
break;
|
|
}
|
|
|
|
return indirect_ctx_offset;
|
|
}
|
|
|
|
static void execlists_init_reg_state(u32 *reg_state,
|
|
struct i915_gem_context *ctx,
|
|
struct intel_engine_cs *engine,
|
|
struct intel_ring *ring)
|
|
{
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
struct i915_hw_ppgtt *ppgtt = ctx->ppgtt ?: dev_priv->mm.aliasing_ppgtt;
|
|
|
|
/* A context is actually a big batch buffer with several MI_LOAD_REGISTER_IMM
|
|
* commands followed by (reg, value) pairs. The values we are setting here are
|
|
* only for the first context restore: on a subsequent save, the GPU will
|
|
* recreate this batchbuffer with new values (including all the missing
|
|
* MI_LOAD_REGISTER_IMM commands that we are not initializing here). */
|
|
reg_state[CTX_LRI_HEADER_0] =
|
|
MI_LOAD_REGISTER_IMM(engine->id == RCS ? 14 : 11) | MI_LRI_FORCE_POSTED;
|
|
ASSIGN_CTX_REG(reg_state, CTX_CONTEXT_CONTROL,
|
|
RING_CONTEXT_CONTROL(engine),
|
|
_MASKED_BIT_ENABLE(CTX_CTRL_INHIBIT_SYN_CTX_SWITCH |
|
|
CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT |
|
|
(HAS_RESOURCE_STREAMER(dev_priv) ?
|
|
CTX_CTRL_RS_CTX_ENABLE : 0)));
|
|
ASSIGN_CTX_REG(reg_state, CTX_RING_HEAD, RING_HEAD(engine->mmio_base),
|
|
0);
|
|
ASSIGN_CTX_REG(reg_state, CTX_RING_TAIL, RING_TAIL(engine->mmio_base),
|
|
0);
|
|
ASSIGN_CTX_REG(reg_state, CTX_RING_BUFFER_START,
|
|
RING_START(engine->mmio_base), 0);
|
|
ASSIGN_CTX_REG(reg_state, CTX_RING_BUFFER_CONTROL,
|
|
RING_CTL(engine->mmio_base),
|
|
RING_CTL_SIZE(ring->size) | RING_VALID);
|
|
ASSIGN_CTX_REG(reg_state, CTX_BB_HEAD_U,
|
|
RING_BBADDR_UDW(engine->mmio_base), 0);
|
|
ASSIGN_CTX_REG(reg_state, CTX_BB_HEAD_L,
|
|
RING_BBADDR(engine->mmio_base), 0);
|
|
ASSIGN_CTX_REG(reg_state, CTX_BB_STATE,
|
|
RING_BBSTATE(engine->mmio_base),
|
|
RING_BB_PPGTT);
|
|
ASSIGN_CTX_REG(reg_state, CTX_SECOND_BB_HEAD_U,
|
|
RING_SBBADDR_UDW(engine->mmio_base), 0);
|
|
ASSIGN_CTX_REG(reg_state, CTX_SECOND_BB_HEAD_L,
|
|
RING_SBBADDR(engine->mmio_base), 0);
|
|
ASSIGN_CTX_REG(reg_state, CTX_SECOND_BB_STATE,
|
|
RING_SBBSTATE(engine->mmio_base), 0);
|
|
if (engine->id == RCS) {
|
|
ASSIGN_CTX_REG(reg_state, CTX_BB_PER_CTX_PTR,
|
|
RING_BB_PER_CTX_PTR(engine->mmio_base), 0);
|
|
ASSIGN_CTX_REG(reg_state, CTX_RCS_INDIRECT_CTX,
|
|
RING_INDIRECT_CTX(engine->mmio_base), 0);
|
|
ASSIGN_CTX_REG(reg_state, CTX_RCS_INDIRECT_CTX_OFFSET,
|
|
RING_INDIRECT_CTX_OFFSET(engine->mmio_base), 0);
|
|
if (engine->wa_ctx.vma) {
|
|
struct i915_ctx_workarounds *wa_ctx = &engine->wa_ctx;
|
|
u32 ggtt_offset = i915_ggtt_offset(wa_ctx->vma);
|
|
|
|
reg_state[CTX_RCS_INDIRECT_CTX+1] =
|
|
(ggtt_offset + wa_ctx->indirect_ctx.offset * sizeof(uint32_t)) |
|
|
(wa_ctx->indirect_ctx.size / CACHELINE_DWORDS);
|
|
|
|
reg_state[CTX_RCS_INDIRECT_CTX_OFFSET+1] =
|
|
intel_lr_indirect_ctx_offset(engine) << 6;
|
|
|
|
reg_state[CTX_BB_PER_CTX_PTR+1] =
|
|
(ggtt_offset + wa_ctx->per_ctx.offset * sizeof(uint32_t)) |
|
|
0x01;
|
|
}
|
|
}
|
|
reg_state[CTX_LRI_HEADER_1] = MI_LOAD_REGISTER_IMM(9) | MI_LRI_FORCE_POSTED;
|
|
ASSIGN_CTX_REG(reg_state, CTX_CTX_TIMESTAMP,
|
|
RING_CTX_TIMESTAMP(engine->mmio_base), 0);
|
|
/* PDP values well be assigned later if needed */
|
|
ASSIGN_CTX_REG(reg_state, CTX_PDP3_UDW, GEN8_RING_PDP_UDW(engine, 3),
|
|
0);
|
|
ASSIGN_CTX_REG(reg_state, CTX_PDP3_LDW, GEN8_RING_PDP_LDW(engine, 3),
|
|
0);
|
|
ASSIGN_CTX_REG(reg_state, CTX_PDP2_UDW, GEN8_RING_PDP_UDW(engine, 2),
|
|
0);
|
|
ASSIGN_CTX_REG(reg_state, CTX_PDP2_LDW, GEN8_RING_PDP_LDW(engine, 2),
|
|
0);
|
|
ASSIGN_CTX_REG(reg_state, CTX_PDP1_UDW, GEN8_RING_PDP_UDW(engine, 1),
|
|
0);
|
|
ASSIGN_CTX_REG(reg_state, CTX_PDP1_LDW, GEN8_RING_PDP_LDW(engine, 1),
|
|
0);
|
|
ASSIGN_CTX_REG(reg_state, CTX_PDP0_UDW, GEN8_RING_PDP_UDW(engine, 0),
|
|
0);
|
|
ASSIGN_CTX_REG(reg_state, CTX_PDP0_LDW, GEN8_RING_PDP_LDW(engine, 0),
|
|
0);
|
|
|
|
if (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));
|
|
}
|
|
}
|
|
|
|
static int
|
|
populate_lr_context(struct i915_gem_context *ctx,
|
|
struct drm_i915_gem_object *ctx_obj,
|
|
struct intel_engine_cs *engine,
|
|
struct intel_ring *ring)
|
|
{
|
|
void *vaddr;
|
|
int ret;
|
|
|
|
ret = i915_gem_object_set_to_cpu_domain(ctx_obj, true);
|
|
if (ret) {
|
|
DRM_DEBUG_DRIVER("Could not set to CPU domain\n");
|
|
return ret;
|
|
}
|
|
|
|
vaddr = i915_gem_object_pin_map(ctx_obj, I915_MAP_WB);
|
|
if (IS_ERR(vaddr)) {
|
|
ret = PTR_ERR(vaddr);
|
|
DRM_DEBUG_DRIVER("Could not map object pages! (%d)\n", ret);
|
|
return ret;
|
|
}
|
|
ctx_obj->dirty = true;
|
|
|
|
/* The second page of the context object contains some fields which must
|
|
* be set up prior to the first execution. */
|
|
|
|
execlists_init_reg_state(vaddr + LRC_STATE_PN * PAGE_SIZE,
|
|
ctx, engine, ring);
|
|
|
|
i915_gem_object_unpin_map(ctx_obj);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* intel_lr_context_size() - return the size of the context for an engine
|
|
* @engine: which engine to find the context size for
|
|
*
|
|
* Each engine may require a different amount of space for a context image,
|
|
* so when allocating (or copying) an image, this function can be used to
|
|
* find the right size for the specific engine.
|
|
*
|
|
* Return: size (in bytes) of an engine-specific context image
|
|
*
|
|
* Note: this size includes the HWSP, which is part of the context image
|
|
* in LRC mode, but does not include the "shared data page" used with
|
|
* GuC submission. The caller should account for this if using the GuC.
|
|
*/
|
|
uint32_t intel_lr_context_size(struct intel_engine_cs *engine)
|
|
{
|
|
int ret = 0;
|
|
|
|
WARN_ON(INTEL_GEN(engine->i915) < 8);
|
|
|
|
switch (engine->id) {
|
|
case RCS:
|
|
if (INTEL_GEN(engine->i915) >= 9)
|
|
ret = GEN9_LR_CONTEXT_RENDER_SIZE;
|
|
else
|
|
ret = GEN8_LR_CONTEXT_RENDER_SIZE;
|
|
break;
|
|
case VCS:
|
|
case BCS:
|
|
case VECS:
|
|
case VCS2:
|
|
ret = GEN8_LR_CONTEXT_OTHER_SIZE;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int execlists_context_deferred_alloc(struct i915_gem_context *ctx,
|
|
struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_gem_object *ctx_obj;
|
|
struct intel_context *ce = &ctx->engine[engine->id];
|
|
struct i915_vma *vma;
|
|
uint32_t context_size;
|
|
struct intel_ring *ring;
|
|
int ret;
|
|
|
|
WARN_ON(ce->state);
|
|
|
|
context_size = round_up(intel_lr_context_size(engine), 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->drm, context_size);
|
|
if (IS_ERR(ctx_obj)) {
|
|
DRM_DEBUG_DRIVER("Alloc LRC backing obj failed.\n");
|
|
return PTR_ERR(ctx_obj);
|
|
}
|
|
|
|
vma = i915_vma_create(ctx_obj, &ctx->i915->ggtt.base, NULL);
|
|
if (IS_ERR(vma)) {
|
|
ret = PTR_ERR(vma);
|
|
goto error_deref_obj;
|
|
}
|
|
|
|
ring = intel_engine_create_ring(engine, ctx->ring_size);
|
|
if (IS_ERR(ring)) {
|
|
ret = PTR_ERR(ring);
|
|
goto error_deref_obj;
|
|
}
|
|
|
|
ret = populate_lr_context(ctx, ctx_obj, engine, ring);
|
|
if (ret) {
|
|
DRM_DEBUG_DRIVER("Failed to populate LRC: %d\n", ret);
|
|
goto error_ring_free;
|
|
}
|
|
|
|
ce->ring = ring;
|
|
ce->state = vma;
|
|
ce->initialised = engine->init_context == NULL;
|
|
|
|
return 0;
|
|
|
|
error_ring_free:
|
|
intel_ring_free(ring);
|
|
error_deref_obj:
|
|
i915_gem_object_put(ctx_obj);
|
|
return ret;
|
|
}
|
|
|
|
void intel_lr_context_resume(struct drm_i915_private *dev_priv)
|
|
{
|
|
struct intel_engine_cs *engine;
|
|
struct i915_gem_context *ctx;
|
|
enum intel_engine_id id;
|
|
|
|
/* Because we emit WA_TAIL_DWORDS there may be a disparity
|
|
* between our bookkeeping in ce->ring->head and ce->ring->tail and
|
|
* that stored in context. As we only write new commands from
|
|
* ce->ring->tail onwards, everything before that is junk. If the GPU
|
|
* starts reading from its RING_HEAD from the context, it may try to
|
|
* execute that junk and die.
|
|
*
|
|
* So to avoid that we reset the context images upon resume. For
|
|
* simplicity, we just zero everything out.
|
|
*/
|
|
list_for_each_entry(ctx, &dev_priv->context_list, link) {
|
|
for_each_engine(engine, dev_priv, id) {
|
|
struct intel_context *ce = &ctx->engine[engine->id];
|
|
u32 *reg;
|
|
|
|
if (!ce->state)
|
|
continue;
|
|
|
|
reg = i915_gem_object_pin_map(ce->state->obj,
|
|
I915_MAP_WB);
|
|
if (WARN_ON(IS_ERR(reg)))
|
|
continue;
|
|
|
|
reg += LRC_STATE_PN * PAGE_SIZE / sizeof(*reg);
|
|
reg[CTX_RING_HEAD+1] = 0;
|
|
reg[CTX_RING_TAIL+1] = 0;
|
|
|
|
ce->state->obj->dirty = true;
|
|
i915_gem_object_unpin_map(ce->state->obj);
|
|
|
|
ce->ring->head = ce->ring->tail = 0;
|
|
ce->ring->last_retired_head = -1;
|
|
intel_ring_update_space(ce->ring);
|
|
}
|
|
}
|
|
}
|