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![Lionel Landwerlin](/assets/img/avatar_default.png)
We want to set this flag in the next commit on requests containing perf queries so that the result of the perf query can just be a delta of global counters, rather than doing post processing of the OA buffer. Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> [ickle: add basic selftest for nopreempt] Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190709164227.25859-1-chris@chris-wilson.co.uk
448 lines
14 KiB
C
448 lines
14 KiB
C
/*
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* Copyright © 2008-2018 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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*/
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#ifndef I915_REQUEST_H
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#define I915_REQUEST_H
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#include <linux/dma-fence.h>
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#include <linux/lockdep.h>
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#include "gt/intel_context_types.h"
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#include "gt/intel_engine_types.h"
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#include "i915_gem.h"
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#include "i915_scheduler.h"
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#include "i915_selftest.h"
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#include "i915_sw_fence.h"
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#include <uapi/drm/i915_drm.h>
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struct drm_file;
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struct drm_i915_gem_object;
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struct i915_request;
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struct intel_timeline;
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struct intel_timeline_cacheline;
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struct i915_capture_list {
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struct i915_capture_list *next;
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struct i915_vma *vma;
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};
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enum {
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/*
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* I915_FENCE_FLAG_ACTIVE - this request is currently submitted to HW.
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*
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* Set by __i915_request_submit() on handing over to HW, and cleared
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* by __i915_request_unsubmit() if we preempt this request.
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*
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* Finally cleared for consistency on retiring the request, when
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* we know the HW is no longer running this request.
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*
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* See i915_request_is_active()
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*/
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I915_FENCE_FLAG_ACTIVE = DMA_FENCE_FLAG_USER_BITS,
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/*
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* I915_FENCE_FLAG_SIGNAL - this request is currently on signal_list
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*
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* Internal bookkeeping used by the breadcrumb code to track when
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* a request is on the various signal_list.
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*/
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I915_FENCE_FLAG_SIGNAL,
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};
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/**
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* Request queue structure.
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*
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* The request queue allows us to note sequence numbers that have been emitted
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* and may be associated with active buffers to be retired.
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*
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* By keeping this list, we can avoid having to do questionable sequence
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* number comparisons on buffer last_read|write_seqno. It also allows an
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* emission time to be associated with the request for tracking how far ahead
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* of the GPU the submission is.
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*
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* When modifying this structure be very aware that we perform a lockless
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* RCU lookup of it that may race against reallocation of the struct
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* from the slab freelist. We intentionally do not zero the structure on
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* allocation so that the lookup can use the dangling pointers (and is
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* cogniscent that those pointers may be wrong). Instead, everything that
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* needs to be initialised must be done so explicitly.
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*
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* The requests are reference counted.
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*/
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struct i915_request {
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struct dma_fence fence;
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spinlock_t lock;
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/** On Which ring this request was generated */
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struct drm_i915_private *i915;
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/**
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* Context and ring buffer related to this request
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* Contexts are refcounted, so when this request is associated with a
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* context, we must increment the context's refcount, to guarantee that
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* it persists while any request is linked to it. Requests themselves
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* are also refcounted, so the request will only be freed when the last
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* reference to it is dismissed, and the code in
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* i915_request_free() will then decrement the refcount on the
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* context.
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*/
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struct i915_gem_context *gem_context;
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struct intel_engine_cs *engine;
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struct intel_context *hw_context;
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struct intel_ring *ring;
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struct intel_timeline *timeline;
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struct list_head signal_link;
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/*
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* The rcu epoch of when this request was allocated. Used to judiciously
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* apply backpressure on future allocations to ensure that under
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* mempressure there is sufficient RCU ticks for us to reclaim our
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* RCU protected slabs.
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*/
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unsigned long rcustate;
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/*
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* We pin the timeline->mutex while constructing the request to
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* ensure that no caller accidentally drops it during construction.
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* The timeline->mutex must be held to ensure that only this caller
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* can use the ring and manipulate the associated timeline during
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* construction.
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*/
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struct pin_cookie cookie;
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/*
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* Fences for the various phases in the request's lifetime.
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*
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* The submit fence is used to await upon all of the request's
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* dependencies. When it is signaled, the request is ready to run.
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* It is used by the driver to then queue the request for execution.
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*/
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struct i915_sw_fence submit;
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union {
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wait_queue_entry_t submitq;
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struct i915_sw_dma_fence_cb dmaq;
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};
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struct list_head execute_cb;
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struct i915_sw_fence semaphore;
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/*
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* A list of everyone we wait upon, and everyone who waits upon us.
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* Even though we will not be submitted to the hardware before the
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* submit fence is signaled (it waits for all external events as well
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* as our own requests), the scheduler still needs to know the
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* dependency tree for the lifetime of the request (from execbuf
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* to retirement), i.e. bidirectional dependency information for the
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* request not tied to individual fences.
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*/
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struct i915_sched_node sched;
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struct i915_dependency dep;
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intel_engine_mask_t execution_mask;
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/*
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* A convenience pointer to the current breadcrumb value stored in
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* the HW status page (or our timeline's local equivalent). The full
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* path would be rq->hw_context->ring->timeline->hwsp_seqno.
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*/
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const u32 *hwsp_seqno;
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/*
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* If we need to access the timeline's seqno for this request in
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* another request, we need to keep a read reference to this associated
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* cacheline, so that we do not free and recycle it before the foreign
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* observers have completed. Hence, we keep a pointer to the cacheline
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* inside the timeline's HWSP vma, but it is only valid while this
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* request has not completed and guarded by the timeline mutex.
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*/
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struct intel_timeline_cacheline *hwsp_cacheline;
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/** Position in the ring of the start of the request */
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u32 head;
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/** Position in the ring of the start of the user packets */
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u32 infix;
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/**
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* Position in the ring of the start of the postfix.
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* This is required to calculate the maximum available ring space
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* without overwriting the postfix.
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*/
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u32 postfix;
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/** Position in the ring of the end of the whole request */
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u32 tail;
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/** Position in the ring of the end of any workarounds after the tail */
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u32 wa_tail;
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/** Preallocate space in the ring for the emitting the request */
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u32 reserved_space;
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/** Batch buffer related to this request if any (used for
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* error state dump only).
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*/
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struct i915_vma *batch;
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/**
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* Additional buffers requested by userspace to be captured upon
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* a GPU hang. The vma/obj on this list are protected by their
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* active reference - all objects on this list must also be
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* on the active_list (of their final request).
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*/
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struct i915_capture_list *capture_list;
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struct list_head active_list;
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/** Time at which this request was emitted, in jiffies. */
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unsigned long emitted_jiffies;
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unsigned long flags;
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#define I915_REQUEST_WAITBOOST BIT(0)
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#define I915_REQUEST_NOPREEMPT BIT(1)
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/** timeline->request entry for this request */
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struct list_head link;
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/** ring->request_list entry for this request */
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struct list_head ring_link;
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struct drm_i915_file_private *file_priv;
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/** file_priv list entry for this request */
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struct list_head client_link;
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I915_SELFTEST_DECLARE(struct {
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struct list_head link;
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unsigned long delay;
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} mock;)
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};
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#define I915_FENCE_GFP (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN)
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extern const struct dma_fence_ops i915_fence_ops;
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static inline bool dma_fence_is_i915(const struct dma_fence *fence)
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{
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return fence->ops == &i915_fence_ops;
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}
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struct i915_request * __must_check
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__i915_request_create(struct intel_context *ce, gfp_t gfp);
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struct i915_request * __must_check
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i915_request_create(struct intel_context *ce);
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struct i915_request *__i915_request_commit(struct i915_request *request);
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void i915_request_retire_upto(struct i915_request *rq);
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static inline struct i915_request *
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to_request(struct dma_fence *fence)
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{
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/* We assume that NULL fence/request are interoperable */
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BUILD_BUG_ON(offsetof(struct i915_request, fence) != 0);
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GEM_BUG_ON(fence && !dma_fence_is_i915(fence));
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return container_of(fence, struct i915_request, fence);
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}
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static inline struct i915_request *
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i915_request_get(struct i915_request *rq)
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{
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return to_request(dma_fence_get(&rq->fence));
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}
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static inline struct i915_request *
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i915_request_get_rcu(struct i915_request *rq)
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{
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return to_request(dma_fence_get_rcu(&rq->fence));
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}
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static inline void
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i915_request_put(struct i915_request *rq)
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{
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dma_fence_put(&rq->fence);
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}
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int i915_request_await_object(struct i915_request *to,
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struct drm_i915_gem_object *obj,
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bool write);
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int i915_request_await_dma_fence(struct i915_request *rq,
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struct dma_fence *fence);
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int i915_request_await_execution(struct i915_request *rq,
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struct dma_fence *fence,
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void (*hook)(struct i915_request *rq,
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struct dma_fence *signal));
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void i915_request_add(struct i915_request *rq);
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void __i915_request_submit(struct i915_request *request);
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void i915_request_submit(struct i915_request *request);
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void i915_request_skip(struct i915_request *request, int error);
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void __i915_request_unsubmit(struct i915_request *request);
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void i915_request_unsubmit(struct i915_request *request);
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/* Note: part of the intel_breadcrumbs family */
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bool i915_request_enable_breadcrumb(struct i915_request *request);
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void i915_request_cancel_breadcrumb(struct i915_request *request);
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long i915_request_wait(struct i915_request *rq,
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unsigned int flags,
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long timeout)
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__attribute__((nonnull(1)));
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#define I915_WAIT_INTERRUPTIBLE BIT(0)
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#define I915_WAIT_LOCKED BIT(1) /* struct_mutex held, handle GPU reset */
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#define I915_WAIT_PRIORITY BIT(2) /* small priority bump for the request */
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#define I915_WAIT_ALL BIT(3) /* used by i915_gem_object_wait() */
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#define I915_WAIT_FOR_IDLE_BOOST BIT(4)
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static inline bool i915_request_signaled(const struct i915_request *rq)
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{
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/* The request may live longer than its HWSP, so check flags first! */
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return test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &rq->fence.flags);
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}
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static inline bool i915_request_is_active(const struct i915_request *rq)
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{
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return test_bit(I915_FENCE_FLAG_ACTIVE, &rq->fence.flags);
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}
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/**
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* Returns true if seq1 is later than seq2.
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*/
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static inline bool i915_seqno_passed(u32 seq1, u32 seq2)
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{
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return (s32)(seq1 - seq2) >= 0;
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}
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static inline u32 __hwsp_seqno(const struct i915_request *rq)
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{
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return READ_ONCE(*rq->hwsp_seqno);
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}
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/**
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* hwsp_seqno - the current breadcrumb value in the HW status page
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* @rq: the request, to chase the relevant HW status page
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*
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* The emphasis in naming here is that hwsp_seqno() is not a property of the
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* request, but an indication of the current HW state (associated with this
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* request). Its value will change as the GPU executes more requests.
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*
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* Returns the current breadcrumb value in the associated HW status page (or
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* the local timeline's equivalent) for this request. The request itself
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* has the associated breadcrumb value of rq->fence.seqno, when the HW
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* status page has that breadcrumb or later, this request is complete.
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*/
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static inline u32 hwsp_seqno(const struct i915_request *rq)
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{
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u32 seqno;
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rcu_read_lock(); /* the HWSP may be freed at runtime */
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seqno = __hwsp_seqno(rq);
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rcu_read_unlock();
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return seqno;
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}
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static inline bool __i915_request_has_started(const struct i915_request *rq)
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{
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return i915_seqno_passed(hwsp_seqno(rq), rq->fence.seqno - 1);
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}
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/**
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* i915_request_started - check if the request has begun being executed
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* @rq: the request
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*
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* If the timeline is not using initial breadcrumbs, a request is
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* considered started if the previous request on its timeline (i.e.
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* context) has been signaled.
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*
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* If the timeline is using semaphores, it will also be emitting an
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* "initial breadcrumb" after the semaphores are complete and just before
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* it began executing the user payload. A request can therefore be active
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* on the HW and not yet started as it is still busywaiting on its
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* dependencies (via HW semaphores).
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*
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* If the request has started, its dependencies will have been signaled
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* (either by fences or by semaphores) and it will have begun processing
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* the user payload.
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*
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* However, even if a request has started, it may have been preempted and
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* so no longer active, or it may have already completed.
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*
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* See also i915_request_is_active().
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*
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* Returns true if the request has begun executing the user payload, or
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* has completed:
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*/
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static inline bool i915_request_started(const struct i915_request *rq)
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{
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if (i915_request_signaled(rq))
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return true;
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/* Remember: started but may have since been preempted! */
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return __i915_request_has_started(rq);
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}
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/**
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* i915_request_is_running - check if the request may actually be executing
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* @rq: the request
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*
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* Returns true if the request is currently submitted to hardware, has passed
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* its start point (i.e. the context is setup and not busywaiting). Note that
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* it may no longer be running by the time the function returns!
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*/
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static inline bool i915_request_is_running(const struct i915_request *rq)
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{
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if (!i915_request_is_active(rq))
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return false;
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return __i915_request_has_started(rq);
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}
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static inline bool i915_request_completed(const struct i915_request *rq)
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{
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if (i915_request_signaled(rq))
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return true;
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return i915_seqno_passed(hwsp_seqno(rq), rq->fence.seqno);
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}
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static inline void i915_request_mark_complete(struct i915_request *rq)
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{
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rq->hwsp_seqno = (u32 *)&rq->fence.seqno; /* decouple from HWSP */
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}
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static inline bool i915_request_has_waitboost(const struct i915_request *rq)
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{
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return rq->flags & I915_REQUEST_WAITBOOST;
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}
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static inline bool i915_request_has_nopreempt(const struct i915_request *rq)
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{
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/* Preemption should only be disabled very rarely */
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return unlikely(rq->flags & I915_REQUEST_NOPREEMPT);
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}
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bool i915_retire_requests(struct drm_i915_private *i915);
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#endif /* I915_REQUEST_H */
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