drivers/gpu/drm/i915/intel_lrc.h

   1 /*
   2  * Copyright © 2014 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #ifndef _INTEL_LRC_H_
  25 #define _INTEL_LRC_H_
  26
  27 /* Execlists regs */
  28 #define RING_ELSP(ring)                 ((ring)->mmio_base+0x230)
  29 #define RING_EXECLIST_STATUS(ring)      ((ring)->mmio_base+0x234)
  30 #define RING_CONTEXT_CONTROL(ring)      ((ring)->mmio_base+0x244)
  31 #define RING_CONTEXT_STATUS_BUF(ring)   ((ring)->mmio_base+0x370)
  32 #define RING_CONTEXT_STATUS_PTR(ring)   ((ring)->mmio_base+0x3a0)
  33
  34 /* Logical Rings */
  35 void intel_logical_ring_stop(struct intel_engine_cs *ring);
  36 void intel_logical_ring_cleanup(struct intel_engine_cs *ring);
  37 int intel_logical_rings_init(struct drm_device *dev);
  38
  39 int logical_ring_flush_all_caches(struct intel_ringbuffer *ringbuf);
  40 void intel_logical_ring_advance_and_submit(struct intel_ringbuffer *ringbuf);
  41 /**
  42  * intel_logical_ring_advance() - advance the ringbuffer tail
  43  * @ringbuf: Ringbuffer to advance.
  44  *
  45  * The tail is only updated in our logical ringbuffer struct.
  46  */
  47 static inline void intel_logical_ring_advance(struct intel_ringbuffer *ringbuf)
  48 {
  49         ringbuf->tail &= ringbuf->size - 1;
  50 }
  51 /**
  52  * intel_logical_ring_emit() - write a DWORD to the ringbuffer.
  53  * @ringbuf: Ringbuffer to write to.
  54  * @data: DWORD to write.
  55  */
  56 static inline void intel_logical_ring_emit(struct intel_ringbuffer *ringbuf,
  57                                            u32 data)
  58 {
  59         iowrite32(data, ringbuf->virtual_start + ringbuf->tail);
  60         ringbuf->tail += 4;
  61 }
  62 int intel_logical_ring_begin(struct intel_ringbuffer *ringbuf, int num_dwords);
  63
  64 /* Logical Ring Contexts */
  65 void intel_lr_context_free(struct intel_context *ctx);
  66 int intel_lr_context_deferred_create(struct intel_context *ctx,
  67                                      struct intel_engine_cs *ring);
  68
  69 /* Execlists */
  70 int intel_sanitize_enable_execlists(struct drm_device *dev, int enable_execlists);
  71 int intel_execlists_submission(struct drm_device *dev, struct drm_file *file,
  72                                struct intel_engine_cs *ring,
  73                                struct intel_context *ctx,
  74                                struct drm_i915_gem_execbuffer2 *args,
  75                                struct list_head *vmas,
  76                                struct drm_i915_gem_object *batch_obj,
  77                                u64 exec_start, u32 flags);
  78 u32 intel_execlists_ctx_id(struct drm_i915_gem_object *ctx_obj);
  79
  80 /**
  81  * struct intel_ctx_submit_request - queued context submission request
  82  * @ctx: Context to submit to the ELSP.
  83  * @ring: Engine to submit it to.
  84  * @tail: how far in the context's ringbuffer this request goes to.
  85  * @execlist_link: link in the submission queue.
  86  * @work: workqueue for processing this request in a bottom half.
  87  * @elsp_submitted: no. of times this request has been sent to the ELSP.
  88  *
  89  * The ELSP only accepts two elements at a time, so we queue context/tail
  90  * pairs on a given queue (ring->execlist_queue) until the hardware is
  91  * available. The queue serves a double purpose: we also use it to keep track
  92  * of the up to 2 contexts currently in the hardware (usually one in execution
  93  * and the other queued up by the GPU): We only remove elements from the head
  94  * of the queue when the hardware informs us that an element has been
  95  * completed.
  96  *
  97  * All accesses to the queue are mediated by a spinlock (ring->execlist_lock).
  98  */
  99 struct intel_ctx_submit_request {
 100         struct intel_context *ctx;
 101         struct intel_engine_cs *ring;
 102         u32 tail;
 103
 104         struct list_head execlist_link;
 105         struct work_struct work;
 106
 107         int elsp_submitted;
 108 };
 109
 110 void intel_execlists_handle_ctx_events(struct intel_engine_cs *ring);
 111
 112 #endif /* _INTEL_LRC_H_ */