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dcb4c12a68
Up until now, we have pinned every logical ring context backing object during creation, and left it pinned until destruction. This made my life easier, but it's a harmful thing to do, because we cause fragmentation of the GGTT (and, eventually, we would run out of space). This patch makes the pinning on-demand: the backing objects of the two contexts that are written to the ELSP are pinned right before submission and unpinned once the hardware is done with them. The only context that is still pinned regardless is the global default one, so that the HWS can still be accessed in the same way (ring->status_page). v2: In the early version of this patch, we were pinning the context as we put it into the ELSP: on the one hand, this is very efficient because only a maximum two contexts are pinned at any given time, but on the other hand, we cannot really pin in interrupt time :( v3: Use a mutex rather than atomic_t to protect pin count to avoid races. Do not unpin default context in free_request. v4: Break out pin and unpin into functions. Fix style problems reported by checkpatch v5: Remove unpin_lock as all pinning and unpinning is done with the struct mutex already locked. Add WARN_ONs to make sure this is the case in future. Issue: VIZ-4277 Signed-off-by: Oscar Mateo <oscar.mateo@intel.com> Signed-off-by: Thomas Daniel <thomas.daniel@intel.com> Reviewed-by: Akash Goel <akash.goels@gmail.com> Reviewed-by: Deepak S<deepak.s@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
119 lines
4.6 KiB
C
119 lines
4.6 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
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _INTEL_LRC_H_
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#define _INTEL_LRC_H_
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#define GEN8_LR_CONTEXT_ALIGN 4096
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/* Execlists regs */
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#define RING_ELSP(ring) ((ring)->mmio_base+0x230)
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#define RING_EXECLIST_STATUS(ring) ((ring)->mmio_base+0x234)
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#define RING_CONTEXT_CONTROL(ring) ((ring)->mmio_base+0x244)
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#define RING_CONTEXT_STATUS_BUF(ring) ((ring)->mmio_base+0x370)
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#define RING_CONTEXT_STATUS_PTR(ring) ((ring)->mmio_base+0x3a0)
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/* Logical Rings */
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void intel_logical_ring_stop(struct intel_engine_cs *ring);
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void intel_logical_ring_cleanup(struct intel_engine_cs *ring);
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int intel_logical_rings_init(struct drm_device *dev);
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int logical_ring_flush_all_caches(struct intel_ringbuffer *ringbuf);
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void intel_logical_ring_advance_and_submit(struct intel_ringbuffer *ringbuf);
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/**
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* intel_logical_ring_advance() - advance the ringbuffer tail
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* @ringbuf: Ringbuffer to advance.
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*
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* The tail is only updated in our logical ringbuffer struct.
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*/
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static inline void intel_logical_ring_advance(struct intel_ringbuffer *ringbuf)
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{
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ringbuf->tail &= ringbuf->size - 1;
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}
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/**
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* intel_logical_ring_emit() - write a DWORD to the ringbuffer.
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* @ringbuf: Ringbuffer to write to.
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* @data: DWORD to write.
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*/
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static inline void intel_logical_ring_emit(struct intel_ringbuffer *ringbuf,
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u32 data)
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{
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iowrite32(data, ringbuf->virtual_start + ringbuf->tail);
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ringbuf->tail += 4;
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}
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int intel_logical_ring_begin(struct intel_ringbuffer *ringbuf, int num_dwords);
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/* Logical Ring Contexts */
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int intel_lr_context_render_state_init(struct intel_engine_cs *ring,
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struct intel_context *ctx);
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void intel_lr_context_free(struct intel_context *ctx);
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int intel_lr_context_deferred_create(struct intel_context *ctx,
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struct intel_engine_cs *ring);
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void intel_lr_context_unpin(struct intel_engine_cs *ring,
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struct intel_context *ctx);
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/* Execlists */
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int intel_sanitize_enable_execlists(struct drm_device *dev, int enable_execlists);
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int intel_execlists_submission(struct drm_device *dev, struct drm_file *file,
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struct intel_engine_cs *ring,
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struct intel_context *ctx,
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struct drm_i915_gem_execbuffer2 *args,
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struct list_head *vmas,
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struct drm_i915_gem_object *batch_obj,
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u64 exec_start, u32 flags);
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u32 intel_execlists_ctx_id(struct drm_i915_gem_object *ctx_obj);
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/**
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* struct intel_ctx_submit_request - queued context submission request
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* @ctx: Context to submit to the ELSP.
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* @ring: Engine to submit it to.
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* @tail: how far in the context's ringbuffer this request goes to.
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* @execlist_link: link in the submission queue.
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* @work: workqueue for processing this request in a bottom half.
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* @elsp_submitted: no. of times this request has been sent to the ELSP.
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*
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* The ELSP only accepts two elements at a time, so we queue context/tail
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* pairs on a given queue (ring->execlist_queue) until the hardware is
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* available. The queue serves a double purpose: we also use it to keep track
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* of the up to 2 contexts currently in the hardware (usually one in execution
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* and the other queued up by the GPU): We only remove elements from the head
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* of the queue when the hardware informs us that an element has been
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* completed.
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*
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* All accesses to the queue are mediated by a spinlock (ring->execlist_lock).
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*/
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struct intel_ctx_submit_request {
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struct intel_context *ctx;
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struct intel_engine_cs *ring;
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u32 tail;
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struct list_head execlist_link;
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int elsp_submitted;
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};
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void intel_execlists_handle_ctx_events(struct intel_engine_cs *ring);
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void intel_execlists_retire_requests(struct intel_engine_cs *ring);
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#endif /* _INTEL_LRC_H_ */
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