2 * Copyright © 2014 Intel Corporation
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:
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
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 DEALINGS
24 * Ben Widawsky <ben@bwidawsk.net>
25 * Michel Thierry <michel.thierry@intel.com>
26 * Thomas Daniel <thomas.daniel@intel.com>
27 * Oscar Mateo <oscar.mateo@intel.com>
32 * GEN8 brings an expansion of the HW contexts: "Logical Ring Contexts".
33 * These expanded contexts enable a number of new abilities, especially
34 * "Execlists" (also implemented in this file).
36 * Execlists are the new method by which, on gen8+ hardware, workloads are
37 * submitted for execution (as opposed to the legacy, ringbuffer-based, method).
41 #include <drm/i915_drm.h>
44 #define GEN8_LR_CONTEXT_RENDER_SIZE (20 * PAGE_SIZE)
45 #define GEN8_LR_CONTEXT_OTHER_SIZE (2 * PAGE_SIZE)
47 #define GEN8_LR_CONTEXT_ALIGN 4096
49 int intel_sanitize_enable_execlists(struct drm_device
*dev
, int enable_execlists
)
51 WARN_ON(i915
.enable_ppgtt
== -1);
53 if (enable_execlists
== 0)
56 if (HAS_LOGICAL_RING_CONTEXTS(dev
) && USES_PPGTT(dev
))
62 void intel_lr_context_free(struct intel_context
*ctx
)
66 for (i
= 0; i
< I915_NUM_RINGS
; i
++) {
67 struct drm_i915_gem_object
*ctx_obj
= ctx
->engine
[i
].state
;
68 struct intel_ringbuffer
*ringbuf
= ctx
->engine
[i
].ringbuf
;
71 intel_destroy_ringbuffer_obj(ringbuf
);
73 i915_gem_object_ggtt_unpin(ctx_obj
);
74 drm_gem_object_unreference(&ctx_obj
->base
);
79 static uint32_t get_lr_context_size(struct intel_engine_cs
*ring
)
83 WARN_ON(INTEL_INFO(ring
->dev
)->gen
!= 8);
87 ret
= GEN8_LR_CONTEXT_RENDER_SIZE
;
93 ret
= GEN8_LR_CONTEXT_OTHER_SIZE
;
100 int intel_lr_context_deferred_create(struct intel_context
*ctx
,
101 struct intel_engine_cs
*ring
)
103 struct drm_device
*dev
= ring
->dev
;
104 struct drm_i915_gem_object
*ctx_obj
;
105 uint32_t context_size
;
106 struct intel_ringbuffer
*ringbuf
;
109 WARN_ON(ctx
->legacy_hw_ctx
.rcs_state
!= NULL
);
111 context_size
= round_up(get_lr_context_size(ring
), 4096);
113 ctx_obj
= i915_gem_alloc_context_obj(dev
, context_size
);
114 if (IS_ERR(ctx_obj
)) {
115 ret
= PTR_ERR(ctx_obj
);
116 DRM_DEBUG_DRIVER("Alloc LRC backing obj failed: %d\n", ret
);
120 ret
= i915_gem_obj_ggtt_pin(ctx_obj
, GEN8_LR_CONTEXT_ALIGN
, 0);
122 DRM_DEBUG_DRIVER("Pin LRC backing obj failed: %d\n", ret
);
123 drm_gem_object_unreference(&ctx_obj
->base
);
127 ringbuf
= kzalloc(sizeof(*ringbuf
), GFP_KERNEL
);
129 DRM_DEBUG_DRIVER("Failed to allocate ringbuffer %s\n",
131 i915_gem_object_ggtt_unpin(ctx_obj
);
132 drm_gem_object_unreference(&ctx_obj
->base
);
137 ringbuf
->ring
= ring
;
138 ringbuf
->size
= 32 * PAGE_SIZE
;
139 ringbuf
->effective_size
= ringbuf
->size
;
142 ringbuf
->space
= ringbuf
->size
;
143 ringbuf
->last_retired_head
= -1;
145 /* TODO: For now we put this in the mappable region so that we can reuse
146 * the existing ringbuffer code which ioremaps it. When we start
147 * creating many contexts, this will no longer work and we must switch
148 * to a kmapish interface.
150 ret
= intel_alloc_ringbuffer_obj(dev
, ringbuf
);
152 DRM_DEBUG_DRIVER("Failed to allocate ringbuffer obj %s: %d\n",
155 i915_gem_object_ggtt_unpin(ctx_obj
);
156 drm_gem_object_unreference(&ctx_obj
->base
);
160 ctx
->engine
[ring
->id
].ringbuf
= ringbuf
;
161 ctx
->engine
[ring
->id
].state
= ctx_obj
;