forked from Minki/linux
097a94815f
Avoid the repeated rbtree lookup for each request as we unwind them by tracking the last priolist. v2: Fix up my unhelpful suggestion of using default_priolist. Signed-off-by: Michał Winiarski <michal.winiarski@intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20170928193910.17988-4-chris@chris-wilson.co.uk
2198 lines
66 KiB
C
2198 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 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 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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#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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#define GEN10_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT 0x19
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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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#define WA_TAIL_BYTES (sizeof(u32) * WA_TAIL_DWORDS)
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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 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_modparams.use_mmio_flip >= 0)
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return 1;
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return 0;
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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 0-11 */
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desc |= i915_ggtt_offset(ce->state) + LRC_HEADER_PAGES * 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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static struct i915_priolist *
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lookup_priolist(struct intel_engine_cs *engine,
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struct i915_priotree *pt,
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int prio)
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{
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struct intel_engine_execlists * const execlists = &engine->execlists;
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struct i915_priolist *p;
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struct rb_node **parent, *rb;
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bool first = true;
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if (unlikely(execlists->no_priolist))
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prio = I915_PRIORITY_NORMAL;
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find_priolist:
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/* most positive priority is scheduled first, equal priorities fifo */
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rb = NULL;
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parent = &execlists->queue.rb_node;
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while (*parent) {
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rb = *parent;
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p = rb_entry(rb, typeof(*p), node);
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if (prio > p->priority) {
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parent = &rb->rb_left;
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} else if (prio < p->priority) {
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parent = &rb->rb_right;
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first = false;
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} else {
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return p;
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}
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}
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if (prio == I915_PRIORITY_NORMAL) {
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p = &execlists->default_priolist;
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} else {
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p = kmem_cache_alloc(engine->i915->priorities, GFP_ATOMIC);
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/* Convert an allocation failure to a priority bump */
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if (unlikely(!p)) {
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prio = I915_PRIORITY_NORMAL; /* recurses just once */
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/* To maintain ordering with all rendering, after an
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* allocation failure we have to disable all scheduling.
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* Requests will then be executed in fifo, and schedule
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* will ensure that dependencies are emitted in fifo.
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* There will be still some reordering with existing
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* requests, so if userspace lied about their
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* dependencies that reordering may be visible.
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*/
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execlists->no_priolist = true;
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goto find_priolist;
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}
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}
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p->priority = prio;
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INIT_LIST_HEAD(&p->requests);
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rb_link_node(&p->node, rb, parent);
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rb_insert_color(&p->node, &execlists->queue);
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if (first)
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execlists->first = &p->node;
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return ptr_pack_bits(p, first, 1);
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}
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static void unwind_wa_tail(struct drm_i915_gem_request *rq)
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{
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rq->tail = intel_ring_wrap(rq->ring, rq->wa_tail - WA_TAIL_BYTES);
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assert_ring_tail_valid(rq->ring, rq->tail);
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}
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static void unwind_incomplete_requests(struct intel_engine_cs *engine)
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{
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struct drm_i915_gem_request *rq, *rn;
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struct i915_priolist *uninitialized_var(p);
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int last_prio = I915_PRIORITY_INVALID;
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lockdep_assert_held(&engine->timeline->lock);
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list_for_each_entry_safe_reverse(rq, rn,
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&engine->timeline->requests,
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link) {
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if (i915_gem_request_completed(rq))
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return;
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__i915_gem_request_unsubmit(rq);
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unwind_wa_tail(rq);
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GEM_BUG_ON(rq->priotree.priority == I915_PRIORITY_INVALID);
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if (rq->priotree.priority != last_prio) {
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p = lookup_priolist(engine,
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&rq->priotree,
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rq->priotree.priority);
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p = ptr_mask_bits(p, 1);
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last_prio = rq->priotree.priority;
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}
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list_add(&rq->priotree.link, &p->requests);
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}
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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->engine->context_status_notifier,
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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 =
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rq->ctx->ppgtt ?: rq->i915->mm.aliasing_ppgtt;
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u32 *reg_state = ce->lrc_reg_state;
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reg_state[CTX_RING_TAIL+1] = intel_ring_set_tail(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 && !i915_vm_is_48bit(&ppgtt->base))
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execlists_update_context_pdps(ppgtt, reg_state);
|
|
|
|
return ce->lrc_desc;
|
|
}
|
|
|
|
static void execlists_submit_ports(struct intel_engine_cs *engine)
|
|
{
|
|
struct execlist_port *port = engine->execlists.port;
|
|
u32 __iomem *elsp =
|
|
engine->i915->regs + i915_mmio_reg_offset(RING_ELSP(engine));
|
|
unsigned int n;
|
|
|
|
for (n = execlists_num_ports(&engine->execlists); n--; ) {
|
|
struct drm_i915_gem_request *rq;
|
|
unsigned int count;
|
|
u64 desc;
|
|
|
|
rq = port_unpack(&port[n], &count);
|
|
if (rq) {
|
|
GEM_BUG_ON(count > !n);
|
|
if (!count++)
|
|
execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_IN);
|
|
port_set(&port[n], port_pack(rq, count));
|
|
desc = execlists_update_context(rq);
|
|
GEM_DEBUG_EXEC(port[n].context_id = upper_32_bits(desc));
|
|
} else {
|
|
GEM_BUG_ON(!n);
|
|
desc = 0;
|
|
}
|
|
|
|
writel(upper_32_bits(desc), elsp);
|
|
writel(lower_32_bits(desc), elsp);
|
|
}
|
|
}
|
|
|
|
static bool ctx_single_port_submission(const struct i915_gem_context *ctx)
|
|
{
|
|
return (IS_ENABLED(CONFIG_DRM_I915_GVT) &&
|
|
i915_gem_context_force_single_submission(ctx));
|
|
}
|
|
|
|
static bool can_merge_ctx(const struct i915_gem_context *prev,
|
|
const struct i915_gem_context *next)
|
|
{
|
|
if (prev != next)
|
|
return false;
|
|
|
|
if (ctx_single_port_submission(prev))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static void port_assign(struct execlist_port *port,
|
|
struct drm_i915_gem_request *rq)
|
|
{
|
|
GEM_BUG_ON(rq == port_request(port));
|
|
|
|
if (port_isset(port))
|
|
i915_gem_request_put(port_request(port));
|
|
|
|
port_set(port, port_pack(i915_gem_request_get(rq), port_count(port)));
|
|
}
|
|
|
|
static void execlists_dequeue(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_gem_request *last;
|
|
struct intel_engine_execlists * const execlists = &engine->execlists;
|
|
struct execlist_port *port = execlists->port;
|
|
const struct execlist_port * const last_port =
|
|
&execlists->port[execlists->port_mask];
|
|
struct rb_node *rb;
|
|
bool submit = false;
|
|
|
|
last = port_request(port);
|
|
if (last)
|
|
/* WaIdleLiteRestore:bdw,skl
|
|
* Apply the wa NOOPs to prevent ring:HEAD == req:TAIL
|
|
* as we resubmit the request. See gen8_emit_breadcrumb()
|
|
* for where we prepare the padding after the end of the
|
|
* request.
|
|
*/
|
|
last->tail = last->wa_tail;
|
|
|
|
/* Hardware submission is through 2 ports. Conceptually each port
|
|
* has a (RING_START, RING_HEAD, RING_TAIL) tuple. RING_START is
|
|
* static for a context, and unique to each, so we only execute
|
|
* requests belonging to a single context from each ring. RING_HEAD
|
|
* is maintained by the CS in the context image, it marks the place
|
|
* where it got up to last time, and through RING_TAIL we tell the CS
|
|
* where we want to execute up to this time.
|
|
*
|
|
* In this list the requests are in order of execution. Consecutive
|
|
* requests from the same context are adjacent in the ringbuffer. We
|
|
* can combine these requests into a single RING_TAIL update:
|
|
*
|
|
* RING_HEAD...req1...req2
|
|
* ^- RING_TAIL
|
|
* since to execute req2 the CS must first execute req1.
|
|
*
|
|
* Our goal then is to point each port to the end of a consecutive
|
|
* sequence of requests as being the most optimal (fewest wake ups
|
|
* and context switches) submission.
|
|
*/
|
|
|
|
spin_lock_irq(&engine->timeline->lock);
|
|
rb = execlists->first;
|
|
GEM_BUG_ON(rb_first(&execlists->queue) != rb);
|
|
while (rb) {
|
|
struct i915_priolist *p = rb_entry(rb, typeof(*p), node);
|
|
struct drm_i915_gem_request *rq, *rn;
|
|
|
|
list_for_each_entry_safe(rq, rn, &p->requests, priotree.link) {
|
|
/*
|
|
* Can we combine this request with the current port?
|
|
* It has to be the same context/ringbuffer and not
|
|
* have any exceptions (e.g. GVT saying never to
|
|
* combine contexts).
|
|
*
|
|
* If we can combine the requests, we can execute both
|
|
* by updating the RING_TAIL to point to the end of the
|
|
* second request, and so we never need to tell the
|
|
* hardware about the first.
|
|
*/
|
|
if (last && !can_merge_ctx(rq->ctx, last->ctx)) {
|
|
/*
|
|
* If we are on the second port and cannot
|
|
* combine this request with the last, then we
|
|
* are done.
|
|
*/
|
|
if (port == last_port) {
|
|
__list_del_many(&p->requests,
|
|
&rq->priotree.link);
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* If GVT overrides us we only ever submit
|
|
* port[0], leaving port[1] empty. Note that we
|
|
* also have to be careful that we don't queue
|
|
* the same context (even though a different
|
|
* request) to the second port.
|
|
*/
|
|
if (ctx_single_port_submission(last->ctx) ||
|
|
ctx_single_port_submission(rq->ctx)) {
|
|
__list_del_many(&p->requests,
|
|
&rq->priotree.link);
|
|
goto done;
|
|
}
|
|
|
|
GEM_BUG_ON(last->ctx == rq->ctx);
|
|
|
|
if (submit)
|
|
port_assign(port, last);
|
|
port++;
|
|
|
|
GEM_BUG_ON(port_isset(port));
|
|
}
|
|
|
|
INIT_LIST_HEAD(&rq->priotree.link);
|
|
rq->priotree.priority = INT_MAX;
|
|
|
|
__i915_gem_request_submit(rq);
|
|
trace_i915_gem_request_in(rq, port_index(port, execlists));
|
|
last = rq;
|
|
submit = true;
|
|
}
|
|
|
|
rb = rb_next(rb);
|
|
rb_erase(&p->node, &execlists->queue);
|
|
INIT_LIST_HEAD(&p->requests);
|
|
if (p->priority != I915_PRIORITY_NORMAL)
|
|
kmem_cache_free(engine->i915->priorities, p);
|
|
}
|
|
done:
|
|
execlists->first = rb;
|
|
if (submit)
|
|
port_assign(port, last);
|
|
spin_unlock_irq(&engine->timeline->lock);
|
|
|
|
if (submit)
|
|
execlists_submit_ports(engine);
|
|
}
|
|
|
|
static void
|
|
execlist_cancel_port_requests(struct intel_engine_execlists *execlists)
|
|
{
|
|
struct execlist_port *port = execlists->port;
|
|
unsigned int num_ports = ARRAY_SIZE(execlists->port);
|
|
|
|
while (num_ports-- && port_isset(port)) {
|
|
struct drm_i915_gem_request *rq = port_request(port);
|
|
|
|
execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_OUT);
|
|
i915_gem_request_put(rq);
|
|
|
|
memset(port, 0, sizeof(*port));
|
|
port++;
|
|
}
|
|
}
|
|
|
|
static void execlists_cancel_requests(struct intel_engine_cs *engine)
|
|
{
|
|
struct intel_engine_execlists * const execlists = &engine->execlists;
|
|
struct drm_i915_gem_request *rq, *rn;
|
|
struct rb_node *rb;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&engine->timeline->lock, flags);
|
|
|
|
/* Cancel the requests on the HW and clear the ELSP tracker. */
|
|
execlist_cancel_port_requests(execlists);
|
|
|
|
/* Mark all executing requests as skipped. */
|
|
list_for_each_entry(rq, &engine->timeline->requests, link) {
|
|
GEM_BUG_ON(!rq->global_seqno);
|
|
if (!i915_gem_request_completed(rq))
|
|
dma_fence_set_error(&rq->fence, -EIO);
|
|
}
|
|
|
|
/* Flush the queued requests to the timeline list (for retiring). */
|
|
rb = execlists->first;
|
|
while (rb) {
|
|
struct i915_priolist *p = rb_entry(rb, typeof(*p), node);
|
|
|
|
list_for_each_entry_safe(rq, rn, &p->requests, priotree.link) {
|
|
INIT_LIST_HEAD(&rq->priotree.link);
|
|
rq->priotree.priority = INT_MAX;
|
|
|
|
dma_fence_set_error(&rq->fence, -EIO);
|
|
__i915_gem_request_submit(rq);
|
|
}
|
|
|
|
rb = rb_next(rb);
|
|
rb_erase(&p->node, &execlists->queue);
|
|
INIT_LIST_HEAD(&p->requests);
|
|
if (p->priority != I915_PRIORITY_NORMAL)
|
|
kmem_cache_free(engine->i915->priorities, p);
|
|
}
|
|
|
|
/* Remaining _unready_ requests will be nop'ed when submitted */
|
|
|
|
|
|
execlists->queue = RB_ROOT;
|
|
execlists->first = NULL;
|
|
GEM_BUG_ON(port_isset(execlists->port));
|
|
|
|
/*
|
|
* The port is checked prior to scheduling a tasklet, but
|
|
* just in case we have suspended the tasklet to do the
|
|
* wedging make sure that when it wakes, it decides there
|
|
* is no work to do by clearing the irq_posted bit.
|
|
*/
|
|
clear_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted);
|
|
|
|
spin_unlock_irqrestore(&engine->timeline->lock, flags);
|
|
}
|
|
|
|
static bool execlists_elsp_ready(const struct intel_engine_cs *engine)
|
|
{
|
|
const struct execlist_port *port = engine->execlists.port;
|
|
|
|
return port_count(&port[0]) + port_count(&port[1]) < 2;
|
|
}
|
|
|
|
/*
|
|
* Check the unread Context Status Buffers and manage the submission of new
|
|
* contexts to the ELSP accordingly.
|
|
*/
|
|
static void intel_lrc_irq_handler(unsigned long data)
|
|
{
|
|
struct intel_engine_cs * const engine = (struct intel_engine_cs *)data;
|
|
struct intel_engine_execlists * const execlists = &engine->execlists;
|
|
struct execlist_port *port = execlists->port;
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
|
|
/* We can skip acquiring intel_runtime_pm_get() here as it was taken
|
|
* on our behalf by the request (see i915_gem_mark_busy()) and it will
|
|
* not be relinquished until the device is idle (see
|
|
* i915_gem_idle_work_handler()). As a precaution, we make sure
|
|
* that all ELSP are drained i.e. we have processed the CSB,
|
|
* before allowing ourselves to idle and calling intel_runtime_pm_put().
|
|
*/
|
|
GEM_BUG_ON(!dev_priv->gt.awake);
|
|
|
|
intel_uncore_forcewake_get(dev_priv, execlists->fw_domains);
|
|
|
|
/* Prefer doing test_and_clear_bit() as a two stage operation to avoid
|
|
* imposing the cost of a locked atomic transaction when submitting a
|
|
* new request (outside of the context-switch interrupt).
|
|
*/
|
|
while (test_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted)) {
|
|
/* The HWSP contains a (cacheable) mirror of the CSB */
|
|
const u32 *buf =
|
|
&engine->status_page.page_addr[I915_HWS_CSB_BUF0_INDEX];
|
|
unsigned int head, tail;
|
|
|
|
/* However GVT emulation depends upon intercepting CSB mmio */
|
|
if (unlikely(execlists->csb_use_mmio)) {
|
|
buf = (u32 * __force)
|
|
(dev_priv->regs + i915_mmio_reg_offset(RING_CONTEXT_STATUS_BUF_LO(engine, 0)));
|
|
execlists->csb_head = -1; /* force mmio read of CSB ptrs */
|
|
}
|
|
|
|
/* The write will be ordered by the uncached read (itself
|
|
* a memory barrier), so we do not need another in the form
|
|
* of a locked instruction. The race between the interrupt
|
|
* handler and the split test/clear is harmless as we order
|
|
* our clear before the CSB read. If the interrupt arrived
|
|
* first between the test and the clear, we read the updated
|
|
* CSB and clear the bit. If the interrupt arrives as we read
|
|
* the CSB or later (i.e. after we had cleared the bit) the bit
|
|
* is set and we do a new loop.
|
|
*/
|
|
__clear_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted);
|
|
if (unlikely(execlists->csb_head == -1)) { /* following a reset */
|
|
head = readl(dev_priv->regs + i915_mmio_reg_offset(RING_CONTEXT_STATUS_PTR(engine)));
|
|
tail = GEN8_CSB_WRITE_PTR(head);
|
|
head = GEN8_CSB_READ_PTR(head);
|
|
execlists->csb_head = head;
|
|
} else {
|
|
const int write_idx =
|
|
intel_hws_csb_write_index(dev_priv) -
|
|
I915_HWS_CSB_BUF0_INDEX;
|
|
|
|
head = execlists->csb_head;
|
|
tail = READ_ONCE(buf[write_idx]);
|
|
}
|
|
|
|
while (head != tail) {
|
|
struct drm_i915_gem_request *rq;
|
|
unsigned int status;
|
|
unsigned int count;
|
|
|
|
if (++head == GEN8_CSB_ENTRIES)
|
|
head = 0;
|
|
|
|
/* We are flying near dragons again.
|
|
*
|
|
* We hold a reference to the request in execlist_port[]
|
|
* but no more than that. We are operating in softirq
|
|
* context and so cannot hold any mutex or sleep. That
|
|
* prevents us stopping the requests we are processing
|
|
* in port[] from being retired simultaneously (the
|
|
* breadcrumb will be complete before we see the
|
|
* context-switch). As we only hold the reference to the
|
|
* request, any pointer chasing underneath the request
|
|
* is subject to a potential use-after-free. Thus we
|
|
* store all of the bookkeeping within port[] as
|
|
* required, and avoid using unguarded pointers beneath
|
|
* request itself. The same applies to the atomic
|
|
* status notifier.
|
|
*/
|
|
|
|
status = READ_ONCE(buf[2 * head]); /* maybe mmio! */
|
|
if (!(status & GEN8_CTX_STATUS_COMPLETED_MASK))
|
|
continue;
|
|
|
|
/* Check the context/desc id for this event matches */
|
|
GEM_DEBUG_BUG_ON(buf[2 * head + 1] != port->context_id);
|
|
|
|
rq = port_unpack(port, &count);
|
|
GEM_BUG_ON(count == 0);
|
|
if (--count == 0) {
|
|
GEM_BUG_ON(status & GEN8_CTX_STATUS_PREEMPTED);
|
|
GEM_BUG_ON(!i915_gem_request_completed(rq));
|
|
execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_OUT);
|
|
|
|
trace_i915_gem_request_out(rq);
|
|
i915_gem_request_put(rq);
|
|
|
|
execlists_port_complete(execlists, port);
|
|
} else {
|
|
port_set(port, port_pack(rq, count));
|
|
}
|
|
|
|
/* After the final element, the hw should be idle */
|
|
GEM_BUG_ON(port_count(port) == 0 &&
|
|
!(status & GEN8_CTX_STATUS_ACTIVE_IDLE));
|
|
}
|
|
|
|
if (head != execlists->csb_head) {
|
|
execlists->csb_head = head;
|
|
writel(_MASKED_FIELD(GEN8_CSB_READ_PTR_MASK, head << 8),
|
|
dev_priv->regs + i915_mmio_reg_offset(RING_CONTEXT_STATUS_PTR(engine)));
|
|
}
|
|
}
|
|
|
|
if (execlists_elsp_ready(engine))
|
|
execlists_dequeue(engine);
|
|
|
|
intel_uncore_forcewake_put(dev_priv, execlists->fw_domains);
|
|
}
|
|
|
|
static void insert_request(struct intel_engine_cs *engine,
|
|
struct i915_priotree *pt,
|
|
int prio)
|
|
{
|
|
struct i915_priolist *p = lookup_priolist(engine, pt, prio);
|
|
|
|
list_add_tail(&pt->link, &ptr_mask_bits(p, 1)->requests);
|
|
if (ptr_unmask_bits(p, 1) && execlists_elsp_ready(engine))
|
|
tasklet_hi_schedule(&engine->execlists.irq_tasklet);
|
|
}
|
|
|
|
static void execlists_submit_request(struct drm_i915_gem_request *request)
|
|
{
|
|
struct intel_engine_cs *engine = request->engine;
|
|
unsigned long flags;
|
|
|
|
/* Will be called from irq-context when using foreign fences. */
|
|
spin_lock_irqsave(&engine->timeline->lock, flags);
|
|
|
|
insert_request(engine, &request->priotree, request->priotree.priority);
|
|
|
|
GEM_BUG_ON(!engine->execlists.first);
|
|
GEM_BUG_ON(list_empty(&request->priotree.link));
|
|
|
|
spin_unlock_irqrestore(&engine->timeline->lock, flags);
|
|
}
|
|
|
|
static struct intel_engine_cs *
|
|
pt_lock_engine(struct i915_priotree *pt, struct intel_engine_cs *locked)
|
|
{
|
|
struct intel_engine_cs *engine =
|
|
container_of(pt, struct drm_i915_gem_request, priotree)->engine;
|
|
|
|
GEM_BUG_ON(!locked);
|
|
|
|
if (engine != locked) {
|
|
spin_unlock(&locked->timeline->lock);
|
|
spin_lock(&engine->timeline->lock);
|
|
}
|
|
|
|
return engine;
|
|
}
|
|
|
|
static void execlists_schedule(struct drm_i915_gem_request *request, int prio)
|
|
{
|
|
struct intel_engine_cs *engine;
|
|
struct i915_dependency *dep, *p;
|
|
struct i915_dependency stack;
|
|
LIST_HEAD(dfs);
|
|
|
|
GEM_BUG_ON(prio == I915_PRIORITY_INVALID);
|
|
|
|
if (prio <= READ_ONCE(request->priotree.priority))
|
|
return;
|
|
|
|
/* Need BKL in order to use the temporary link inside i915_dependency */
|
|
lockdep_assert_held(&request->i915->drm.struct_mutex);
|
|
|
|
stack.signaler = &request->priotree;
|
|
list_add(&stack.dfs_link, &dfs);
|
|
|
|
/* Recursively bump all dependent priorities to match the new request.
|
|
*
|
|
* A naive approach would be to use recursion:
|
|
* static void update_priorities(struct i915_priotree *pt, prio) {
|
|
* list_for_each_entry(dep, &pt->signalers_list, signal_link)
|
|
* update_priorities(dep->signal, prio)
|
|
* insert_request(pt);
|
|
* }
|
|
* but that may have unlimited recursion depth and so runs a very
|
|
* real risk of overunning the kernel stack. Instead, we build
|
|
* a flat list of all dependencies starting with the current request.
|
|
* As we walk the list of dependencies, we add all of its dependencies
|
|
* to the end of the list (this may include an already visited
|
|
* request) and continue to walk onwards onto the new dependencies. The
|
|
* end result is a topological list of requests in reverse order, the
|
|
* last element in the list is the request we must execute first.
|
|
*/
|
|
list_for_each_entry_safe(dep, p, &dfs, dfs_link) {
|
|
struct i915_priotree *pt = dep->signaler;
|
|
|
|
/* Within an engine, there can be no cycle, but we may
|
|
* refer to the same dependency chain multiple times
|
|
* (redundant dependencies are not eliminated) and across
|
|
* engines.
|
|
*/
|
|
list_for_each_entry(p, &pt->signalers_list, signal_link) {
|
|
GEM_BUG_ON(p->signaler->priority < pt->priority);
|
|
if (prio > READ_ONCE(p->signaler->priority))
|
|
list_move_tail(&p->dfs_link, &dfs);
|
|
}
|
|
|
|
list_safe_reset_next(dep, p, dfs_link);
|
|
}
|
|
|
|
/* If we didn't need to bump any existing priorities, and we haven't
|
|
* yet submitted this request (i.e. there is no potential race with
|
|
* execlists_submit_request()), we can set our own priority and skip
|
|
* acquiring the engine locks.
|
|
*/
|
|
if (request->priotree.priority == I915_PRIORITY_INVALID) {
|
|
GEM_BUG_ON(!list_empty(&request->priotree.link));
|
|
request->priotree.priority = prio;
|
|
if (stack.dfs_link.next == stack.dfs_link.prev)
|
|
return;
|
|
__list_del_entry(&stack.dfs_link);
|
|
}
|
|
|
|
engine = request->engine;
|
|
spin_lock_irq(&engine->timeline->lock);
|
|
|
|
/* Fifo and depth-first replacement ensure our deps execute before us */
|
|
list_for_each_entry_safe_reverse(dep, p, &dfs, dfs_link) {
|
|
struct i915_priotree *pt = dep->signaler;
|
|
|
|
INIT_LIST_HEAD(&dep->dfs_link);
|
|
|
|
engine = pt_lock_engine(pt, engine);
|
|
|
|
if (prio <= pt->priority)
|
|
continue;
|
|
|
|
pt->priority = prio;
|
|
if (!list_empty(&pt->link)) {
|
|
__list_del_entry(&pt->link);
|
|
insert_request(engine, pt, prio);
|
|
}
|
|
}
|
|
|
|
spin_unlock_irq(&engine->timeline->lock);
|
|
|
|
/* XXX Do we need to preempt to make room for us and our deps? */
|
|
}
|
|
|
|
static struct intel_ring *
|
|
execlists_context_pin(struct intel_engine_cs *engine,
|
|
struct i915_gem_context *ctx)
|
|
{
|
|
struct intel_context *ce = &ctx->engine[engine->id];
|
|
unsigned int flags;
|
|
void *vaddr;
|
|
int ret;
|
|
|
|
lockdep_assert_held(&ctx->i915->drm.struct_mutex);
|
|
|
|
if (likely(ce->pin_count++))
|
|
goto out;
|
|
GEM_BUG_ON(!ce->pin_count); /* no overflow please! */
|
|
|
|
if (!ce->state) {
|
|
ret = execlists_context_deferred_alloc(ctx, engine);
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
GEM_BUG_ON(!ce->state);
|
|
|
|
flags = PIN_GLOBAL | PIN_HIGH;
|
|
if (ctx->ggtt_offset_bias)
|
|
flags |= PIN_OFFSET_BIAS | ctx->ggtt_offset_bias;
|
|
|
|
ret = i915_vma_pin(ce->state, 0, GEN8_LR_CONTEXT_ALIGN, flags);
|
|
if (ret)
|
|
goto err;
|
|
|
|
vaddr = i915_gem_object_pin_map(ce->state->obj, I915_MAP_WB);
|
|
if (IS_ERR(vaddr)) {
|
|
ret = PTR_ERR(vaddr);
|
|
goto unpin_vma;
|
|
}
|
|
|
|
ret = intel_ring_pin(ce->ring, ctx->i915, ctx->ggtt_offset_bias);
|
|
if (ret)
|
|
goto unpin_map;
|
|
|
|
intel_lr_context_descriptor_update(ctx, engine);
|
|
|
|
ce->lrc_reg_state = vaddr + LRC_STATE_PN * PAGE_SIZE;
|
|
ce->lrc_reg_state[CTX_RING_BUFFER_START+1] =
|
|
i915_ggtt_offset(ce->ring->vma);
|
|
|
|
ce->state->obj->mm.dirty = true;
|
|
|
|
i915_gem_context_get(ctx);
|
|
out:
|
|
return ce->ring;
|
|
|
|
unpin_map:
|
|
i915_gem_object_unpin_map(ce->state->obj);
|
|
unpin_vma:
|
|
__i915_vma_unpin(ce->state);
|
|
err:
|
|
ce->pin_count = 0;
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static void execlists_context_unpin(struct intel_engine_cs *engine,
|
|
struct i915_gem_context *ctx)
|
|
{
|
|
struct intel_context *ce = &ctx->engine[engine->id];
|
|
|
|
lockdep_assert_held(&ctx->i915->drm.struct_mutex);
|
|
GEM_BUG_ON(ce->pin_count == 0);
|
|
|
|
if (--ce->pin_count)
|
|
return;
|
|
|
|
intel_ring_unpin(ce->ring);
|
|
|
|
i915_gem_object_unpin_map(ce->state->obj);
|
|
i915_vma_unpin(ce->state);
|
|
|
|
i915_gem_context_put(ctx);
|
|
}
|
|
|
|
static int execlists_request_alloc(struct drm_i915_gem_request *request)
|
|
{
|
|
struct intel_engine_cs *engine = request->engine;
|
|
struct intel_context *ce = &request->ctx->engine[engine->id];
|
|
u32 *cs;
|
|
int ret;
|
|
|
|
GEM_BUG_ON(!ce->pin_count);
|
|
|
|
/* Flush enough space to reduce the likelihood of waiting after
|
|
* we start building the request - in which case we will just
|
|
* have to repeat work.
|
|
*/
|
|
request->reserved_space += EXECLISTS_REQUEST_SIZE;
|
|
|
|
cs = intel_ring_begin(request, 0);
|
|
if (IS_ERR(cs))
|
|
return PTR_ERR(cs);
|
|
|
|
if (!ce->initialised) {
|
|
ret = engine->init_context(request);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ce->initialised = true;
|
|
}
|
|
|
|
/* Note that after this point, we have committed to using
|
|
* this request as it is being used to both track the
|
|
* state of engine initialisation and liveness of the
|
|
* golden renderstate above. Think twice before you try
|
|
* to cancel/unwind this request now.
|
|
*/
|
|
|
|
request->reserved_space -= EXECLISTS_REQUEST_SIZE;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* In this WA we need to set GEN8_L3SQCREG4[21:21] and reset it after
|
|
* PIPE_CONTROL instruction. This is required for the flush to happen correctly
|
|
* but there is a slight complication as this is applied in WA batch where the
|
|
* values are only initialized once so we cannot take register value at the
|
|
* beginning and reuse it further; hence we save its value to memory, upload a
|
|
* constant value with bit21 set and then we restore it back with the saved value.
|
|
* To simplify the WA, a constant value is formed by using the default value
|
|
* of this register. This shouldn't be a problem because we are only modifying
|
|
* it for a short period and this batch in non-premptible. We can ofcourse
|
|
* use additional instructions that read the actual value of the register
|
|
* at that time and set our bit of interest but it makes the WA complicated.
|
|
*
|
|
* This WA is also required for Gen9 so extracting as a function avoids
|
|
* code duplication.
|
|
*/
|
|
static u32 *
|
|
gen8_emit_flush_coherentl3_wa(struct intel_engine_cs *engine, u32 *batch)
|
|
{
|
|
*batch++ = MI_STORE_REGISTER_MEM_GEN8 | MI_SRM_LRM_GLOBAL_GTT;
|
|
*batch++ = i915_mmio_reg_offset(GEN8_L3SQCREG4);
|
|
*batch++ = i915_ggtt_offset(engine->scratch) + 256;
|
|
*batch++ = 0;
|
|
|
|
*batch++ = MI_LOAD_REGISTER_IMM(1);
|
|
*batch++ = i915_mmio_reg_offset(GEN8_L3SQCREG4);
|
|
*batch++ = 0x40400000 | GEN8_LQSC_FLUSH_COHERENT_LINES;
|
|
|
|
batch = gen8_emit_pipe_control(batch,
|
|
PIPE_CONTROL_CS_STALL |
|
|
PIPE_CONTROL_DC_FLUSH_ENABLE,
|
|
0);
|
|
|
|
*batch++ = MI_LOAD_REGISTER_MEM_GEN8 | MI_SRM_LRM_GLOBAL_GTT;
|
|
*batch++ = i915_mmio_reg_offset(GEN8_L3SQCREG4);
|
|
*batch++ = i915_ggtt_offset(engine->scratch) + 256;
|
|
*batch++ = 0;
|
|
|
|
return batch;
|
|
}
|
|
|
|
/*
|
|
* Typically we only have one indirect_ctx and per_ctx batch buffer which are
|
|
* initialized at the beginning and shared across all contexts but this field
|
|
* helps us to have multiple batches at different offsets and select them based
|
|
* on a criteria. At the moment this batch always start at the beginning of the page
|
|
* and at this point we don't have multiple wa_ctx batch buffers.
|
|
*
|
|
* The number of WA applied are not known at the beginning; we use this field
|
|
* to return the no of DWORDS written.
|
|
*
|
|
* It is to be noted that this batch does not contain MI_BATCH_BUFFER_END
|
|
* so it adds NOOPs as padding to make it cacheline aligned.
|
|
* MI_BATCH_BUFFER_END will be added to perctx batch and both of them together
|
|
* makes a complete batch buffer.
|
|
*/
|
|
static u32 *gen8_init_indirectctx_bb(struct intel_engine_cs *engine, u32 *batch)
|
|
{
|
|
/* WaDisableCtxRestoreArbitration:bdw,chv */
|
|
*batch++ = MI_ARB_ON_OFF | MI_ARB_DISABLE;
|
|
|
|
/* WaFlushCoherentL3CacheLinesAtContextSwitch:bdw */
|
|
if (IS_BROADWELL(engine->i915))
|
|
batch = gen8_emit_flush_coherentl3_wa(engine, batch);
|
|
|
|
/* WaClearSlmSpaceAtContextSwitch:bdw,chv */
|
|
/* Actual scratch location is at 128 bytes offset */
|
|
batch = gen8_emit_pipe_control(batch,
|
|
PIPE_CONTROL_FLUSH_L3 |
|
|
PIPE_CONTROL_GLOBAL_GTT_IVB |
|
|
PIPE_CONTROL_CS_STALL |
|
|
PIPE_CONTROL_QW_WRITE,
|
|
i915_ggtt_offset(engine->scratch) +
|
|
2 * CACHELINE_BYTES);
|
|
|
|
/* Pad to end of cacheline */
|
|
while ((unsigned long)batch % CACHELINE_BYTES)
|
|
*batch++ = MI_NOOP;
|
|
|
|
/*
|
|
* MI_BATCH_BUFFER_END is not required in Indirect ctx BB because
|
|
* execution depends on the length specified in terms of cache lines
|
|
* in the register CTX_RCS_INDIRECT_CTX
|
|
*/
|
|
|
|
return batch;
|
|
}
|
|
|
|
/*
|
|
* 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 u32 *gen8_init_perctx_bb(struct intel_engine_cs *engine, u32 *batch)
|
|
{
|
|
/* WaDisableCtxRestoreArbitration:bdw,chv */
|
|
*batch++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
|
|
*batch++ = MI_BATCH_BUFFER_END;
|
|
|
|
return batch;
|
|
}
|
|
|
|
static u32 *gen9_init_indirectctx_bb(struct intel_engine_cs *engine, u32 *batch)
|
|
{
|
|
/* WaFlushCoherentL3CacheLinesAtContextSwitch:skl,bxt,glk */
|
|
batch = gen8_emit_flush_coherentl3_wa(engine, batch);
|
|
|
|
/* WaDisableGatherAtSetShaderCommonSlice:skl,bxt,kbl,glk */
|
|
*batch++ = MI_LOAD_REGISTER_IMM(1);
|
|
*batch++ = i915_mmio_reg_offset(COMMON_SLICE_CHICKEN2);
|
|
*batch++ = _MASKED_BIT_DISABLE(
|
|
GEN9_DISABLE_GATHER_AT_SET_SHADER_COMMON_SLICE);
|
|
*batch++ = MI_NOOP;
|
|
|
|
/* WaClearSlmSpaceAtContextSwitch:kbl */
|
|
/* Actual scratch location is at 128 bytes offset */
|
|
if (IS_KBL_REVID(engine->i915, 0, KBL_REVID_A0)) {
|
|
batch = gen8_emit_pipe_control(batch,
|
|
PIPE_CONTROL_FLUSH_L3 |
|
|
PIPE_CONTROL_GLOBAL_GTT_IVB |
|
|
PIPE_CONTROL_CS_STALL |
|
|
PIPE_CONTROL_QW_WRITE,
|
|
i915_ggtt_offset(engine->scratch)
|
|
+ 2 * CACHELINE_BYTES);
|
|
}
|
|
|
|
/* WaMediaPoolStateCmdInWABB:bxt,glk */
|
|
if (HAS_POOLED_EU(engine->i915)) {
|
|
/*
|
|
* EU pool configuration is setup along with golden context
|
|
* during context initialization. This value depends on
|
|
* device type (2x6 or 3x6) and needs to be updated based
|
|
* on which subslice is disabled especially for 2x6
|
|
* devices, however it is safe to load default
|
|
* configuration of 3x6 device instead of masking off
|
|
* corresponding bits because HW ignores bits of a disabled
|
|
* subslice and drops down to appropriate config. Please
|
|
* see render_state_setup() in i915_gem_render_state.c for
|
|
* possible configurations, to avoid duplication they are
|
|
* not shown here again.
|
|
*/
|
|
*batch++ = GEN9_MEDIA_POOL_STATE;
|
|
*batch++ = GEN9_MEDIA_POOL_ENABLE;
|
|
*batch++ = 0x00777000;
|
|
*batch++ = 0;
|
|
*batch++ = 0;
|
|
*batch++ = 0;
|
|
}
|
|
|
|
/* Pad to end of cacheline */
|
|
while ((unsigned long)batch % CACHELINE_BYTES)
|
|
*batch++ = MI_NOOP;
|
|
|
|
return batch;
|
|
}
|
|
|
|
#define CTX_WA_BB_OBJ_SIZE (PAGE_SIZE)
|
|
|
|
static int lrc_setup_wa_ctx(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_gem_object *obj;
|
|
struct i915_vma *vma;
|
|
int err;
|
|
|
|
obj = i915_gem_object_create(engine->i915, CTX_WA_BB_OBJ_SIZE);
|
|
if (IS_ERR(obj))
|
|
return PTR_ERR(obj);
|
|
|
|
vma = i915_vma_instance(obj, &engine->i915->ggtt.base, NULL);
|
|
if (IS_ERR(vma)) {
|
|
err = PTR_ERR(vma);
|
|
goto err;
|
|
}
|
|
|
|
err = i915_vma_pin(vma, 0, PAGE_SIZE, PIN_GLOBAL | PIN_HIGH);
|
|
if (err)
|
|
goto err;
|
|
|
|
engine->wa_ctx.vma = vma;
|
|
return 0;
|
|
|
|
err:
|
|
i915_gem_object_put(obj);
|
|
return err;
|
|
}
|
|
|
|
static void lrc_destroy_wa_ctx(struct intel_engine_cs *engine)
|
|
{
|
|
i915_vma_unpin_and_release(&engine->wa_ctx.vma);
|
|
}
|
|
|
|
typedef u32 *(*wa_bb_func_t)(struct intel_engine_cs *engine, u32 *batch);
|
|
|
|
static int intel_init_workaround_bb(struct intel_engine_cs *engine)
|
|
{
|
|
struct i915_ctx_workarounds *wa_ctx = &engine->wa_ctx;
|
|
struct i915_wa_ctx_bb *wa_bb[2] = { &wa_ctx->indirect_ctx,
|
|
&wa_ctx->per_ctx };
|
|
wa_bb_func_t wa_bb_fn[2];
|
|
struct page *page;
|
|
void *batch, *batch_ptr;
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
if (WARN_ON(engine->id != RCS || !engine->scratch))
|
|
return -EINVAL;
|
|
|
|
switch (INTEL_GEN(engine->i915)) {
|
|
case 10:
|
|
return 0;
|
|
case 9:
|
|
wa_bb_fn[0] = gen9_init_indirectctx_bb;
|
|
wa_bb_fn[1] = NULL;
|
|
break;
|
|
case 8:
|
|
wa_bb_fn[0] = gen8_init_indirectctx_bb;
|
|
wa_bb_fn[1] = gen8_init_perctx_bb;
|
|
break;
|
|
default:
|
|
MISSING_CASE(INTEL_GEN(engine->i915));
|
|
return 0;
|
|
}
|
|
|
|
ret = lrc_setup_wa_ctx(engine);
|
|
if (ret) {
|
|
DRM_DEBUG_DRIVER("Failed to setup context WA page: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
page = i915_gem_object_get_dirty_page(wa_ctx->vma->obj, 0);
|
|
batch = batch_ptr = kmap_atomic(page);
|
|
|
|
/*
|
|
* Emit the two workaround batch buffers, recording the offset from the
|
|
* start of the workaround batch buffer object for each and their
|
|
* respective sizes.
|
|
*/
|
|
for (i = 0; i < ARRAY_SIZE(wa_bb_fn); i++) {
|
|
wa_bb[i]->offset = batch_ptr - batch;
|
|
if (WARN_ON(!IS_ALIGNED(wa_bb[i]->offset, CACHELINE_BYTES))) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (wa_bb_fn[i])
|
|
batch_ptr = wa_bb_fn[i](engine, batch_ptr);
|
|
wa_bb[i]->size = batch_ptr - (batch + wa_bb[i]->offset);
|
|
}
|
|
|
|
BUG_ON(batch_ptr - batch > CTX_WA_BB_OBJ_SIZE);
|
|
|
|
kunmap_atomic(batch);
|
|
if (ret)
|
|
lrc_destroy_wa_ctx(engine);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static u8 gtiir[] = {
|
|
[RCS] = 0,
|
|
[BCS] = 0,
|
|
[VCS] = 1,
|
|
[VCS2] = 1,
|
|
[VECS] = 3,
|
|
};
|
|
|
|
static int gen8_init_common_ring(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
struct intel_engine_execlists * const execlists = &engine->execlists;
|
|
int ret;
|
|
|
|
ret = intel_mocs_init_engine(engine);
|
|
if (ret)
|
|
return ret;
|
|
|
|
intel_engine_reset_breadcrumbs(engine);
|
|
intel_engine_init_hangcheck(engine);
|
|
|
|
I915_WRITE(RING_HWSTAM(engine->mmio_base), 0xffffffff);
|
|
I915_WRITE(RING_MODE_GEN7(engine),
|
|
_MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE));
|
|
I915_WRITE(RING_HWS_PGA(engine->mmio_base),
|
|
engine->status_page.ggtt_offset);
|
|
POSTING_READ(RING_HWS_PGA(engine->mmio_base));
|
|
|
|
DRM_DEBUG_DRIVER("Execlists enabled for %s\n", engine->name);
|
|
|
|
GEM_BUG_ON(engine->id >= ARRAY_SIZE(gtiir));
|
|
|
|
/*
|
|
* Clear any pending interrupt state.
|
|
*
|
|
* We do it twice out of paranoia that some of the IIR are double
|
|
* buffered, and if we only reset it once there may still be
|
|
* an interrupt pending.
|
|
*/
|
|
I915_WRITE(GEN8_GT_IIR(gtiir[engine->id]),
|
|
GT_CONTEXT_SWITCH_INTERRUPT << engine->irq_shift);
|
|
I915_WRITE(GEN8_GT_IIR(gtiir[engine->id]),
|
|
GT_CONTEXT_SWITCH_INTERRUPT << engine->irq_shift);
|
|
clear_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted);
|
|
execlists->csb_head = -1;
|
|
|
|
/* After a GPU reset, we may have requests to replay */
|
|
if (!i915_modparams.enable_guc_submission && execlists->first)
|
|
tasklet_schedule(&execlists->irq_tasklet);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gen8_init_render_ring(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
int ret;
|
|
|
|
ret = gen8_init_common_ring(engine);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* We need to disable the AsyncFlip performance optimisations in order
|
|
* to use MI_WAIT_FOR_EVENT within the CS. It should already be
|
|
* programmed to '1' on all products.
|
|
*
|
|
* WaDisableAsyncFlipPerfMode:snb,ivb,hsw,vlv,bdw,chv
|
|
*/
|
|
I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE));
|
|
|
|
I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_FORCE_ORDERING));
|
|
|
|
return init_workarounds_ring(engine);
|
|
}
|
|
|
|
static int gen9_init_render_ring(struct intel_engine_cs *engine)
|
|
{
|
|
int ret;
|
|
|
|
ret = gen8_init_common_ring(engine);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return init_workarounds_ring(engine);
|
|
}
|
|
|
|
static void reset_common_ring(struct intel_engine_cs *engine,
|
|
struct drm_i915_gem_request *request)
|
|
{
|
|
struct intel_engine_execlists * const execlists = &engine->execlists;
|
|
struct intel_context *ce;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&engine->timeline->lock, flags);
|
|
|
|
/*
|
|
* Catch up with any missed context-switch interrupts.
|
|
*
|
|
* Ideally we would just read the remaining CSB entries now that we
|
|
* know the gpu is idle. However, the CSB registers are sometimes^W
|
|
* often trashed across a GPU reset! Instead we have to rely on
|
|
* guessing the missed context-switch events by looking at what
|
|
* requests were completed.
|
|
*/
|
|
execlist_cancel_port_requests(execlists);
|
|
|
|
/* Push back any incomplete requests for replay after the reset. */
|
|
unwind_incomplete_requests(engine);
|
|
|
|
spin_unlock_irqrestore(&engine->timeline->lock, flags);
|
|
|
|
/* If the request was innocent, we leave the request in the ELSP
|
|
* and will try to replay it on restarting. The context image may
|
|
* have been corrupted by the reset, in which case we may have
|
|
* to service a new GPU hang, but more likely we can continue on
|
|
* without impact.
|
|
*
|
|
* If the request was guilty, we presume the context is corrupt
|
|
* and have to at least restore the RING register in the context
|
|
* image back to the expected values to skip over the guilty request.
|
|
*/
|
|
if (!request || request->fence.error != -EIO)
|
|
return;
|
|
|
|
/* We want a simple context + ring to execute the breadcrumb update.
|
|
* We cannot rely on the context being intact across the GPU hang,
|
|
* so clear it and rebuild just what we need for the breadcrumb.
|
|
* All pending requests for this context will be zapped, and any
|
|
* future request will be after userspace has had the opportunity
|
|
* to recreate its own state.
|
|
*/
|
|
ce = &request->ctx->engine[engine->id];
|
|
execlists_init_reg_state(ce->lrc_reg_state,
|
|
request->ctx, engine, ce->ring);
|
|
|
|
/* Move the RING_HEAD onto the breadcrumb, past the hanging batch */
|
|
ce->lrc_reg_state[CTX_RING_BUFFER_START+1] =
|
|
i915_ggtt_offset(ce->ring->vma);
|
|
ce->lrc_reg_state[CTX_RING_HEAD+1] = request->postfix;
|
|
|
|
request->ring->head = request->postfix;
|
|
intel_ring_update_space(request->ring);
|
|
|
|
/* Reset WaIdleLiteRestore:bdw,skl as well */
|
|
unwind_wa_tail(request);
|
|
}
|
|
|
|
static int intel_logical_ring_emit_pdps(struct drm_i915_gem_request *req)
|
|
{
|
|
struct i915_hw_ppgtt *ppgtt = req->ctx->ppgtt;
|
|
struct intel_engine_cs *engine = req->engine;
|
|
const int num_lri_cmds = GEN8_3LVL_PDPES * 2;
|
|
u32 *cs;
|
|
int i;
|
|
|
|
cs = intel_ring_begin(req, num_lri_cmds * 2 + 2);
|
|
if (IS_ERR(cs))
|
|
return PTR_ERR(cs);
|
|
|
|
*cs++ = MI_LOAD_REGISTER_IMM(num_lri_cmds);
|
|
for (i = GEN8_3LVL_PDPES - 1; i >= 0; i--) {
|
|
const dma_addr_t pd_daddr = i915_page_dir_dma_addr(ppgtt, i);
|
|
|
|
*cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_UDW(engine, i));
|
|
*cs++ = upper_32_bits(pd_daddr);
|
|
*cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_LDW(engine, i));
|
|
*cs++ = lower_32_bits(pd_daddr);
|
|
}
|
|
|
|
*cs++ = MI_NOOP;
|
|
intel_ring_advance(req, cs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gen8_emit_bb_start(struct drm_i915_gem_request *req,
|
|
u64 offset, u32 len,
|
|
const unsigned int flags)
|
|
{
|
|
u32 *cs;
|
|
int ret;
|
|
|
|
/* Don't rely in hw updating PDPs, specially in lite-restore.
|
|
* Ideally, we should set Force PD Restore in ctx descriptor,
|
|
* but we can't. Force Restore would be a second option, but
|
|
* it is unsafe in case of lite-restore (because the ctx is
|
|
* not idle). PML4 is allocated during ppgtt init so this is
|
|
* not needed in 48-bit.*/
|
|
if (req->ctx->ppgtt &&
|
|
(intel_engine_flag(req->engine) & req->ctx->ppgtt->pd_dirty_rings) &&
|
|
!i915_vm_is_48bit(&req->ctx->ppgtt->base) &&
|
|
!intel_vgpu_active(req->i915)) {
|
|
ret = intel_logical_ring_emit_pdps(req);
|
|
if (ret)
|
|
return ret;
|
|
|
|
req->ctx->ppgtt->pd_dirty_rings &= ~intel_engine_flag(req->engine);
|
|
}
|
|
|
|
cs = intel_ring_begin(req, 4);
|
|
if (IS_ERR(cs))
|
|
return PTR_ERR(cs);
|
|
|
|
/* FIXME(BDW): Address space and security selectors. */
|
|
*cs++ = MI_BATCH_BUFFER_START_GEN8 |
|
|
(flags & I915_DISPATCH_SECURE ? 0 : BIT(8)) |
|
|
(flags & I915_DISPATCH_RS ? MI_BATCH_RESOURCE_STREAMER : 0);
|
|
*cs++ = lower_32_bits(offset);
|
|
*cs++ = upper_32_bits(offset);
|
|
*cs++ = MI_NOOP;
|
|
intel_ring_advance(req, cs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void gen8_logical_ring_enable_irq(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
I915_WRITE_IMR(engine,
|
|
~(engine->irq_enable_mask | engine->irq_keep_mask));
|
|
POSTING_READ_FW(RING_IMR(engine->mmio_base));
|
|
}
|
|
|
|
static void gen8_logical_ring_disable_irq(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
I915_WRITE_IMR(engine, ~engine->irq_keep_mask);
|
|
}
|
|
|
|
static int gen8_emit_flush(struct drm_i915_gem_request *request, u32 mode)
|
|
{
|
|
u32 cmd, *cs;
|
|
|
|
cs = intel_ring_begin(request, 4);
|
|
if (IS_ERR(cs))
|
|
return PTR_ERR(cs);
|
|
|
|
cmd = MI_FLUSH_DW + 1;
|
|
|
|
/* We always require a command barrier so that subsequent
|
|
* commands, such as breadcrumb interrupts, are strictly ordered
|
|
* wrt the contents of the write cache being flushed to memory
|
|
* (and thus being coherent from the CPU).
|
|
*/
|
|
cmd |= MI_FLUSH_DW_STORE_INDEX | MI_FLUSH_DW_OP_STOREDW;
|
|
|
|
if (mode & EMIT_INVALIDATE) {
|
|
cmd |= MI_INVALIDATE_TLB;
|
|
if (request->engine->id == VCS)
|
|
cmd |= MI_INVALIDATE_BSD;
|
|
}
|
|
|
|
*cs++ = cmd;
|
|
*cs++ = I915_GEM_HWS_SCRATCH_ADDR | MI_FLUSH_DW_USE_GTT;
|
|
*cs++ = 0; /* upper addr */
|
|
*cs++ = 0; /* value */
|
|
intel_ring_advance(request, cs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gen8_emit_flush_render(struct drm_i915_gem_request *request,
|
|
u32 mode)
|
|
{
|
|
struct intel_engine_cs *engine = request->engine;
|
|
u32 scratch_addr =
|
|
i915_ggtt_offset(engine->scratch) + 2 * CACHELINE_BYTES;
|
|
bool vf_flush_wa = false, dc_flush_wa = false;
|
|
u32 *cs, flags = 0;
|
|
int len;
|
|
|
|
flags |= PIPE_CONTROL_CS_STALL;
|
|
|
|
if (mode & EMIT_FLUSH) {
|
|
flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
|
|
flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
|
|
flags |= PIPE_CONTROL_DC_FLUSH_ENABLE;
|
|
flags |= PIPE_CONTROL_FLUSH_ENABLE;
|
|
}
|
|
|
|
if (mode & EMIT_INVALIDATE) {
|
|
flags |= PIPE_CONTROL_TLB_INVALIDATE;
|
|
flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
|
|
flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
|
|
flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
|
|
flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
|
|
flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
|
|
flags |= PIPE_CONTROL_QW_WRITE;
|
|
flags |= PIPE_CONTROL_GLOBAL_GTT_IVB;
|
|
|
|
/*
|
|
* On GEN9: before VF_CACHE_INVALIDATE we need to emit a NULL
|
|
* pipe control.
|
|
*/
|
|
if (IS_GEN9(request->i915))
|
|
vf_flush_wa = true;
|
|
|
|
/* WaForGAMHang:kbl */
|
|
if (IS_KBL_REVID(request->i915, 0, KBL_REVID_B0))
|
|
dc_flush_wa = true;
|
|
}
|
|
|
|
len = 6;
|
|
|
|
if (vf_flush_wa)
|
|
len += 6;
|
|
|
|
if (dc_flush_wa)
|
|
len += 12;
|
|
|
|
cs = intel_ring_begin(request, len);
|
|
if (IS_ERR(cs))
|
|
return PTR_ERR(cs);
|
|
|
|
if (vf_flush_wa)
|
|
cs = gen8_emit_pipe_control(cs, 0, 0);
|
|
|
|
if (dc_flush_wa)
|
|
cs = gen8_emit_pipe_control(cs, PIPE_CONTROL_DC_FLUSH_ENABLE,
|
|
0);
|
|
|
|
cs = gen8_emit_pipe_control(cs, flags, scratch_addr);
|
|
|
|
if (dc_flush_wa)
|
|
cs = gen8_emit_pipe_control(cs, PIPE_CONTROL_CS_STALL, 0);
|
|
|
|
intel_ring_advance(request, cs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Reserve space for 2 NOOPs at the end of each request to be
|
|
* used as a workaround for not being allowed to do lite
|
|
* restore with HEAD==TAIL (WaIdleLiteRestore).
|
|
*/
|
|
static void gen8_emit_wa_tail(struct drm_i915_gem_request *request, u32 *cs)
|
|
{
|
|
*cs++ = MI_NOOP;
|
|
*cs++ = MI_NOOP;
|
|
request->wa_tail = intel_ring_offset(request, cs);
|
|
}
|
|
|
|
static void gen8_emit_breadcrumb(struct drm_i915_gem_request *request, u32 *cs)
|
|
{
|
|
/* w/a: bit 5 needs to be zero for MI_FLUSH_DW address. */
|
|
BUILD_BUG_ON(I915_GEM_HWS_INDEX_ADDR & (1 << 5));
|
|
|
|
*cs++ = (MI_FLUSH_DW + 1) | MI_FLUSH_DW_OP_STOREDW;
|
|
*cs++ = intel_hws_seqno_address(request->engine) | MI_FLUSH_DW_USE_GTT;
|
|
*cs++ = 0;
|
|
*cs++ = request->global_seqno;
|
|
*cs++ = MI_USER_INTERRUPT;
|
|
*cs++ = MI_NOOP;
|
|
request->tail = intel_ring_offset(request, cs);
|
|
assert_ring_tail_valid(request->ring, request->tail);
|
|
|
|
gen8_emit_wa_tail(request, cs);
|
|
}
|
|
|
|
static const int gen8_emit_breadcrumb_sz = 6 + WA_TAIL_DWORDS;
|
|
|
|
static void gen8_emit_breadcrumb_render(struct drm_i915_gem_request *request,
|
|
u32 *cs)
|
|
{
|
|
/* We're using qword write, seqno should be aligned to 8 bytes. */
|
|
BUILD_BUG_ON(I915_GEM_HWS_INDEX & 1);
|
|
|
|
/* w/a for post sync ops following a GPGPU operation we
|
|
* need a prior CS_STALL, which is emitted by the flush
|
|
* following the batch.
|
|
*/
|
|
*cs++ = GFX_OP_PIPE_CONTROL(6);
|
|
*cs++ = PIPE_CONTROL_GLOBAL_GTT_IVB | PIPE_CONTROL_CS_STALL |
|
|
PIPE_CONTROL_QW_WRITE;
|
|
*cs++ = intel_hws_seqno_address(request->engine);
|
|
*cs++ = 0;
|
|
*cs++ = request->global_seqno;
|
|
/* We're thrashing one dword of HWS. */
|
|
*cs++ = 0;
|
|
*cs++ = MI_USER_INTERRUPT;
|
|
*cs++ = MI_NOOP;
|
|
request->tail = intel_ring_offset(request, cs);
|
|
assert_ring_tail_valid(request->ring, request->tail);
|
|
|
|
gen8_emit_wa_tail(request, cs);
|
|
}
|
|
|
|
static const int gen8_emit_breadcrumb_render_sz = 8 + WA_TAIL_DWORDS;
|
|
|
|
static int gen8_init_rcs_context(struct drm_i915_gem_request *req)
|
|
{
|
|
int ret;
|
|
|
|
ret = intel_ring_workarounds_emit(req);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = intel_rcs_context_init_mocs(req);
|
|
/*
|
|
* Failing to program the MOCS is non-fatal.The system will not
|
|
* run at peak performance. So generate an error and carry on.
|
|
*/
|
|
if (ret)
|
|
DRM_ERROR("MOCS failed to program: expect performance issues.\n");
|
|
|
|
return i915_gem_render_state_emit(req);
|
|
}
|
|
|
|
/**
|
|
* intel_logical_ring_cleanup() - deallocate the Engine Command Streamer
|
|
* @engine: Engine Command Streamer.
|
|
*/
|
|
void intel_logical_ring_cleanup(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_private *dev_priv;
|
|
|
|
/*
|
|
* Tasklet cannot be active at this point due intel_mark_active/idle
|
|
* so this is just for documentation.
|
|
*/
|
|
if (WARN_ON(test_bit(TASKLET_STATE_SCHED, &engine->execlists.irq_tasklet.state)))
|
|
tasklet_kill(&engine->execlists.irq_tasklet);
|
|
|
|
dev_priv = engine->i915;
|
|
|
|
if (engine->buffer) {
|
|
WARN_ON((I915_READ_MODE(engine) & MODE_IDLE) == 0);
|
|
}
|
|
|
|
if (engine->cleanup)
|
|
engine->cleanup(engine);
|
|
|
|
intel_engine_cleanup_common(engine);
|
|
|
|
lrc_destroy_wa_ctx(engine);
|
|
engine->i915 = NULL;
|
|
dev_priv->engine[engine->id] = NULL;
|
|
kfree(engine);
|
|
}
|
|
|
|
static void execlists_set_default_submission(struct intel_engine_cs *engine)
|
|
{
|
|
engine->submit_request = execlists_submit_request;
|
|
engine->cancel_requests = execlists_cancel_requests;
|
|
engine->schedule = execlists_schedule;
|
|
engine->execlists.irq_tasklet.func = intel_lrc_irq_handler;
|
|
}
|
|
|
|
static void
|
|
logical_ring_default_vfuncs(struct intel_engine_cs *engine)
|
|
{
|
|
/* Default vfuncs which can be overriden by each engine. */
|
|
engine->init_hw = gen8_init_common_ring;
|
|
engine->reset_hw = reset_common_ring;
|
|
|
|
engine->context_pin = execlists_context_pin;
|
|
engine->context_unpin = execlists_context_unpin;
|
|
|
|
engine->request_alloc = execlists_request_alloc;
|
|
|
|
engine->emit_flush = gen8_emit_flush;
|
|
engine->emit_breadcrumb = gen8_emit_breadcrumb;
|
|
engine->emit_breadcrumb_sz = gen8_emit_breadcrumb_sz;
|
|
|
|
engine->set_default_submission = execlists_set_default_submission;
|
|
|
|
engine->irq_enable = gen8_logical_ring_enable_irq;
|
|
engine->irq_disable = gen8_logical_ring_disable_irq;
|
|
engine->emit_bb_start = gen8_emit_bb_start;
|
|
}
|
|
|
|
static inline void
|
|
logical_ring_default_irqs(struct intel_engine_cs *engine)
|
|
{
|
|
unsigned shift = engine->irq_shift;
|
|
engine->irq_enable_mask = GT_RENDER_USER_INTERRUPT << shift;
|
|
engine->irq_keep_mask = GT_CONTEXT_SWITCH_INTERRUPT << shift;
|
|
}
|
|
|
|
static void
|
|
logical_ring_setup(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
enum forcewake_domains fw_domains;
|
|
|
|
intel_engine_setup_common(engine);
|
|
|
|
/* Intentionally left blank. */
|
|
engine->buffer = NULL;
|
|
|
|
fw_domains = intel_uncore_forcewake_for_reg(dev_priv,
|
|
RING_ELSP(engine),
|
|
FW_REG_WRITE);
|
|
|
|
fw_domains |= intel_uncore_forcewake_for_reg(dev_priv,
|
|
RING_CONTEXT_STATUS_PTR(engine),
|
|
FW_REG_READ | FW_REG_WRITE);
|
|
|
|
fw_domains |= intel_uncore_forcewake_for_reg(dev_priv,
|
|
RING_CONTEXT_STATUS_BUF_BASE(engine),
|
|
FW_REG_READ);
|
|
|
|
engine->execlists.fw_domains = fw_domains;
|
|
|
|
tasklet_init(&engine->execlists.irq_tasklet,
|
|
intel_lrc_irq_handler, (unsigned long)engine);
|
|
|
|
logical_ring_default_vfuncs(engine);
|
|
logical_ring_default_irqs(engine);
|
|
}
|
|
|
|
static int logical_ring_init(struct intel_engine_cs *engine)
|
|
{
|
|
int ret;
|
|
|
|
ret = intel_engine_init_common(engine);
|
|
if (ret)
|
|
goto error;
|
|
|
|
return 0;
|
|
|
|
error:
|
|
intel_logical_ring_cleanup(engine);
|
|
return ret;
|
|
}
|
|
|
|
int logical_render_ring_init(struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
int ret;
|
|
|
|
logical_ring_setup(engine);
|
|
|
|
if (HAS_L3_DPF(dev_priv))
|
|
engine->irq_keep_mask |= GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
|
|
|
|
/* Override some for render ring. */
|
|
if (INTEL_GEN(dev_priv) >= 9)
|
|
engine->init_hw = gen9_init_render_ring;
|
|
else
|
|
engine->init_hw = gen8_init_render_ring;
|
|
engine->init_context = gen8_init_rcs_context;
|
|
engine->emit_flush = gen8_emit_flush_render;
|
|
engine->emit_breadcrumb = gen8_emit_breadcrumb_render;
|
|
engine->emit_breadcrumb_sz = gen8_emit_breadcrumb_render_sz;
|
|
|
|
ret = intel_engine_create_scratch(engine, PAGE_SIZE);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = intel_init_workaround_bb(engine);
|
|
if (ret) {
|
|
/*
|
|
* We continue even if we fail to initialize WA batch
|
|
* because we only expect rare glitches but nothing
|
|
* critical to prevent us from using GPU
|
|
*/
|
|
DRM_ERROR("WA batch buffer initialization failed: %d\n",
|
|
ret);
|
|
}
|
|
|
|
return logical_ring_init(engine);
|
|
}
|
|
|
|
int logical_xcs_ring_init(struct intel_engine_cs *engine)
|
|
{
|
|
logical_ring_setup(engine);
|
|
|
|
return logical_ring_init(engine);
|
|
}
|
|
|
|
static u32
|
|
make_rpcs(struct drm_i915_private *dev_priv)
|
|
{
|
|
u32 rpcs = 0;
|
|
|
|
/*
|
|
* No explicit RPCS request is needed to ensure full
|
|
* slice/subslice/EU enablement prior to Gen9.
|
|
*/
|
|
if (INTEL_GEN(dev_priv) < 9)
|
|
return 0;
|
|
|
|
/*
|
|
* Starting in Gen9, render power gating can leave
|
|
* slice/subslice/EU in a partially enabled state. We
|
|
* must make an explicit request through RPCS for full
|
|
* enablement.
|
|
*/
|
|
if (INTEL_INFO(dev_priv)->sseu.has_slice_pg) {
|
|
rpcs |= GEN8_RPCS_S_CNT_ENABLE;
|
|
rpcs |= hweight8(INTEL_INFO(dev_priv)->sseu.slice_mask) <<
|
|
GEN8_RPCS_S_CNT_SHIFT;
|
|
rpcs |= GEN8_RPCS_ENABLE;
|
|
}
|
|
|
|
if (INTEL_INFO(dev_priv)->sseu.has_subslice_pg) {
|
|
rpcs |= GEN8_RPCS_SS_CNT_ENABLE;
|
|
rpcs |= hweight8(INTEL_INFO(dev_priv)->sseu.subslice_mask) <<
|
|
GEN8_RPCS_SS_CNT_SHIFT;
|
|
rpcs |= GEN8_RPCS_ENABLE;
|
|
}
|
|
|
|
if (INTEL_INFO(dev_priv)->sseu.has_eu_pg) {
|
|
rpcs |= INTEL_INFO(dev_priv)->sseu.eu_per_subslice <<
|
|
GEN8_RPCS_EU_MIN_SHIFT;
|
|
rpcs |= INTEL_INFO(dev_priv)->sseu.eu_per_subslice <<
|
|
GEN8_RPCS_EU_MAX_SHIFT;
|
|
rpcs |= GEN8_RPCS_ENABLE;
|
|
}
|
|
|
|
return rpcs;
|
|
}
|
|
|
|
static u32 intel_lr_indirect_ctx_offset(struct intel_engine_cs *engine)
|
|
{
|
|
u32 indirect_ctx_offset;
|
|
|
|
switch (INTEL_GEN(engine->i915)) {
|
|
default:
|
|
MISSING_CASE(INTEL_GEN(engine->i915));
|
|
/* fall through */
|
|
case 10:
|
|
indirect_ctx_offset =
|
|
GEN10_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT;
|
|
break;
|
|
case 9:
|
|
indirect_ctx_offset =
|
|
GEN9_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT;
|
|
break;
|
|
case 8:
|
|
indirect_ctx_offset =
|
|
GEN8_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT;
|
|
break;
|
|
}
|
|
|
|
return indirect_ctx_offset;
|
|
}
|
|
|
|
static void execlists_init_reg_state(u32 *regs,
|
|
struct i915_gem_context *ctx,
|
|
struct intel_engine_cs *engine,
|
|
struct intel_ring *ring)
|
|
{
|
|
struct drm_i915_private *dev_priv = engine->i915;
|
|
struct i915_hw_ppgtt *ppgtt = ctx->ppgtt ?: dev_priv->mm.aliasing_ppgtt;
|
|
u32 base = engine->mmio_base;
|
|
bool rcs = engine->id == RCS;
|
|
|
|
/* A context is actually a big batch buffer with several
|
|
* MI_LOAD_REGISTER_IMM commands followed by (reg, value) pairs. The
|
|
* values we are setting here are only for the first context restore:
|
|
* on a subsequent save, the GPU will recreate this batchbuffer with new
|
|
* values (including all the missing MI_LOAD_REGISTER_IMM commands that
|
|
* we are not initializing here).
|
|
*/
|
|
regs[CTX_LRI_HEADER_0] = MI_LOAD_REGISTER_IMM(rcs ? 14 : 11) |
|
|
MI_LRI_FORCE_POSTED;
|
|
|
|
CTX_REG(regs, CTX_CONTEXT_CONTROL, RING_CONTEXT_CONTROL(engine),
|
|
_MASKED_BIT_ENABLE(CTX_CTRL_INHIBIT_SYN_CTX_SWITCH |
|
|
CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT |
|
|
(HAS_RESOURCE_STREAMER(dev_priv) ?
|
|
CTX_CTRL_RS_CTX_ENABLE : 0)));
|
|
CTX_REG(regs, CTX_RING_HEAD, RING_HEAD(base), 0);
|
|
CTX_REG(regs, CTX_RING_TAIL, RING_TAIL(base), 0);
|
|
CTX_REG(regs, CTX_RING_BUFFER_START, RING_START(base), 0);
|
|
CTX_REG(regs, CTX_RING_BUFFER_CONTROL, RING_CTL(base),
|
|
RING_CTL_SIZE(ring->size) | RING_VALID);
|
|
CTX_REG(regs, CTX_BB_HEAD_U, RING_BBADDR_UDW(base), 0);
|
|
CTX_REG(regs, CTX_BB_HEAD_L, RING_BBADDR(base), 0);
|
|
CTX_REG(regs, CTX_BB_STATE, RING_BBSTATE(base), RING_BB_PPGTT);
|
|
CTX_REG(regs, CTX_SECOND_BB_HEAD_U, RING_SBBADDR_UDW(base), 0);
|
|
CTX_REG(regs, CTX_SECOND_BB_HEAD_L, RING_SBBADDR(base), 0);
|
|
CTX_REG(regs, CTX_SECOND_BB_STATE, RING_SBBSTATE(base), 0);
|
|
if (rcs) {
|
|
struct i915_ctx_workarounds *wa_ctx = &engine->wa_ctx;
|
|
|
|
CTX_REG(regs, CTX_RCS_INDIRECT_CTX, RING_INDIRECT_CTX(base), 0);
|
|
CTX_REG(regs, CTX_RCS_INDIRECT_CTX_OFFSET,
|
|
RING_INDIRECT_CTX_OFFSET(base), 0);
|
|
if (wa_ctx->indirect_ctx.size) {
|
|
u32 ggtt_offset = i915_ggtt_offset(wa_ctx->vma);
|
|
|
|
regs[CTX_RCS_INDIRECT_CTX + 1] =
|
|
(ggtt_offset + wa_ctx->indirect_ctx.offset) |
|
|
(wa_ctx->indirect_ctx.size / CACHELINE_BYTES);
|
|
|
|
regs[CTX_RCS_INDIRECT_CTX_OFFSET + 1] =
|
|
intel_lr_indirect_ctx_offset(engine) << 6;
|
|
}
|
|
|
|
CTX_REG(regs, CTX_BB_PER_CTX_PTR, RING_BB_PER_CTX_PTR(base), 0);
|
|
if (wa_ctx->per_ctx.size) {
|
|
u32 ggtt_offset = i915_ggtt_offset(wa_ctx->vma);
|
|
|
|
regs[CTX_BB_PER_CTX_PTR + 1] =
|
|
(ggtt_offset + wa_ctx->per_ctx.offset) | 0x01;
|
|
}
|
|
}
|
|
|
|
regs[CTX_LRI_HEADER_1] = MI_LOAD_REGISTER_IMM(9) | MI_LRI_FORCE_POSTED;
|
|
|
|
CTX_REG(regs, CTX_CTX_TIMESTAMP, RING_CTX_TIMESTAMP(base), 0);
|
|
/* PDP values well be assigned later if needed */
|
|
CTX_REG(regs, CTX_PDP3_UDW, GEN8_RING_PDP_UDW(engine, 3), 0);
|
|
CTX_REG(regs, CTX_PDP3_LDW, GEN8_RING_PDP_LDW(engine, 3), 0);
|
|
CTX_REG(regs, CTX_PDP2_UDW, GEN8_RING_PDP_UDW(engine, 2), 0);
|
|
CTX_REG(regs, CTX_PDP2_LDW, GEN8_RING_PDP_LDW(engine, 2), 0);
|
|
CTX_REG(regs, CTX_PDP1_UDW, GEN8_RING_PDP_UDW(engine, 1), 0);
|
|
CTX_REG(regs, CTX_PDP1_LDW, GEN8_RING_PDP_LDW(engine, 1), 0);
|
|
CTX_REG(regs, CTX_PDP0_UDW, GEN8_RING_PDP_UDW(engine, 0), 0);
|
|
CTX_REG(regs, CTX_PDP0_LDW, GEN8_RING_PDP_LDW(engine, 0), 0);
|
|
|
|
if (ppgtt && i915_vm_is_48bit(&ppgtt->base)) {
|
|
/* 64b PPGTT (48bit canonical)
|
|
* PDP0_DESCRIPTOR contains the base address to PML4 and
|
|
* other PDP Descriptors are ignored.
|
|
*/
|
|
ASSIGN_CTX_PML4(ppgtt, regs);
|
|
}
|
|
|
|
if (rcs) {
|
|
regs[CTX_LRI_HEADER_2] = MI_LOAD_REGISTER_IMM(1);
|
|
CTX_REG(regs, CTX_R_PWR_CLK_STATE, GEN8_R_PWR_CLK_STATE,
|
|
make_rpcs(dev_priv));
|
|
|
|
i915_oa_init_reg_state(engine, ctx, regs);
|
|
}
|
|
}
|
|
|
|
static int
|
|
populate_lr_context(struct i915_gem_context *ctx,
|
|
struct drm_i915_gem_object *ctx_obj,
|
|
struct intel_engine_cs *engine,
|
|
struct intel_ring *ring)
|
|
{
|
|
void *vaddr;
|
|
int ret;
|
|
|
|
ret = i915_gem_object_set_to_cpu_domain(ctx_obj, true);
|
|
if (ret) {
|
|
DRM_DEBUG_DRIVER("Could not set to CPU domain\n");
|
|
return ret;
|
|
}
|
|
|
|
vaddr = i915_gem_object_pin_map(ctx_obj, I915_MAP_WB);
|
|
if (IS_ERR(vaddr)) {
|
|
ret = PTR_ERR(vaddr);
|
|
DRM_DEBUG_DRIVER("Could not map object pages! (%d)\n", ret);
|
|
return ret;
|
|
}
|
|
ctx_obj->mm.dirty = true;
|
|
|
|
/* The second page of the context object contains some fields which must
|
|
* be set up prior to the first execution. */
|
|
|
|
execlists_init_reg_state(vaddr + LRC_STATE_PN * PAGE_SIZE,
|
|
ctx, engine, ring);
|
|
|
|
i915_gem_object_unpin_map(ctx_obj);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int execlists_context_deferred_alloc(struct i915_gem_context *ctx,
|
|
struct intel_engine_cs *engine)
|
|
{
|
|
struct drm_i915_gem_object *ctx_obj;
|
|
struct intel_context *ce = &ctx->engine[engine->id];
|
|
struct i915_vma *vma;
|
|
uint32_t context_size;
|
|
struct intel_ring *ring;
|
|
int ret;
|
|
|
|
WARN_ON(ce->state);
|
|
|
|
context_size = round_up(engine->context_size, I915_GTT_PAGE_SIZE);
|
|
|
|
/*
|
|
* Before the actual start of the context image, we insert a few pages
|
|
* for our own use and for sharing with the GuC.
|
|
*/
|
|
context_size += LRC_HEADER_PAGES * PAGE_SIZE;
|
|
|
|
ctx_obj = i915_gem_object_create(ctx->i915, context_size);
|
|
if (IS_ERR(ctx_obj)) {
|
|
DRM_DEBUG_DRIVER("Alloc LRC backing obj failed.\n");
|
|
return PTR_ERR(ctx_obj);
|
|
}
|
|
|
|
vma = i915_vma_instance(ctx_obj, &ctx->i915->ggtt.base, NULL);
|
|
if (IS_ERR(vma)) {
|
|
ret = PTR_ERR(vma);
|
|
goto error_deref_obj;
|
|
}
|
|
|
|
ring = intel_engine_create_ring(engine, ctx->ring_size);
|
|
if (IS_ERR(ring)) {
|
|
ret = PTR_ERR(ring);
|
|
goto error_deref_obj;
|
|
}
|
|
|
|
ret = populate_lr_context(ctx, ctx_obj, engine, ring);
|
|
if (ret) {
|
|
DRM_DEBUG_DRIVER("Failed to populate LRC: %d\n", ret);
|
|
goto error_ring_free;
|
|
}
|
|
|
|
ce->ring = ring;
|
|
ce->state = vma;
|
|
ce->initialised |= engine->init_context == NULL;
|
|
|
|
return 0;
|
|
|
|
error_ring_free:
|
|
intel_ring_free(ring);
|
|
error_deref_obj:
|
|
i915_gem_object_put(ctx_obj);
|
|
return ret;
|
|
}
|
|
|
|
void intel_lr_context_resume(struct drm_i915_private *dev_priv)
|
|
{
|
|
struct intel_engine_cs *engine;
|
|
struct i915_gem_context *ctx;
|
|
enum intel_engine_id id;
|
|
|
|
/* Because we emit WA_TAIL_DWORDS there may be a disparity
|
|
* between our bookkeeping in ce->ring->head and ce->ring->tail and
|
|
* that stored in context. As we only write new commands from
|
|
* ce->ring->tail onwards, everything before that is junk. If the GPU
|
|
* starts reading from its RING_HEAD from the context, it may try to
|
|
* execute that junk and die.
|
|
*
|
|
* So to avoid that we reset the context images upon resume. For
|
|
* simplicity, we just zero everything out.
|
|
*/
|
|
list_for_each_entry(ctx, &dev_priv->contexts.list, link) {
|
|
for_each_engine(engine, dev_priv, id) {
|
|
struct intel_context *ce = &ctx->engine[engine->id];
|
|
u32 *reg;
|
|
|
|
if (!ce->state)
|
|
continue;
|
|
|
|
reg = i915_gem_object_pin_map(ce->state->obj,
|
|
I915_MAP_WB);
|
|
if (WARN_ON(IS_ERR(reg)))
|
|
continue;
|
|
|
|
reg += LRC_STATE_PN * PAGE_SIZE / sizeof(*reg);
|
|
reg[CTX_RING_HEAD+1] = 0;
|
|
reg[CTX_RING_TAIL+1] = 0;
|
|
|
|
ce->state->obj->mm.dirty = true;
|
|
i915_gem_object_unpin_map(ce->state->obj);
|
|
|
|
intel_ring_reset(ce->ring, 0);
|
|
}
|
|
}
|
|
}
|