tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright © 2014-2017 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 DEALINGS
21 * IN THE SOFTWARE.
22 *
23 */
24
25#include "intel_guc_ads.h"
26#include "intel_uc.h"
27#include "i915_drv.h"
28
29/*
30 * The Additional Data Struct (ADS) has pointers for different buffers used by
31 * the GuC. One single gem object contains the ADS struct itself (guc_ads), the
32 * scheduling policies (guc_policies), a structure describing a collection of
33 * register sets (guc_mmio_reg_state) and some extra pages for the GuC to save
34 * its internal state for sleep.
35 */
36
37static void guc_policy_init(struct guc_policy *policy)
38{
39 policy->execution_quantum = POLICY_DEFAULT_EXECUTION_QUANTUM_US;
40 policy->preemption_time = POLICY_DEFAULT_PREEMPTION_TIME_US;
41 policy->fault_time = POLICY_DEFAULT_FAULT_TIME_US;
42 policy->policy_flags = 0;
43}
44
45static void guc_policies_init(struct guc_policies *policies)
46{
47 struct guc_policy *policy;
48 u32 p, i;
49
50 policies->dpc_promote_time = POLICY_DEFAULT_DPC_PROMOTE_TIME_US;
51 policies->max_num_work_items = POLICY_MAX_NUM_WI;
52
53 for (p = 0; p < GUC_CLIENT_PRIORITY_NUM; p++) {
54 for (i = GUC_RENDER_ENGINE; i < GUC_MAX_ENGINES_NUM; i++) {
55 policy = &policies->policy[p][i];
56
57 guc_policy_init(policy);
58 }
59 }
60
61 policies->is_valid = 1;
62}
63
64/*
65 * The first 80 dwords of the register state context, containing the
66 * execlists and ppgtt registers.
67 */
68#define LR_HW_CONTEXT_SIZE (80 * sizeof(u32))
69
70/**
71 * intel_guc_ads_create() - creates GuC ADS
72 * @guc: intel_guc struct
73 *
74 */
75int intel_guc_ads_create(struct intel_guc *guc)
76{
77 struct drm_i915_private *dev_priv = guc_to_i915(guc);
78 struct i915_vma *vma, *kernel_ctx_vma;
79 struct page *page;
80 /* The ads obj includes the struct itself and buffers passed to GuC */
81 struct {
82 struct guc_ads ads;
83 struct guc_policies policies;
84 struct guc_mmio_reg_state reg_state;
85 u8 reg_state_buffer[GUC_S3_SAVE_SPACE_PAGES * PAGE_SIZE];
86 } __packed *blob;
87 struct intel_engine_cs *engine;
88 enum intel_engine_id id;
89 const u32 skipped_offset = LRC_HEADER_PAGES * PAGE_SIZE;
90 const u32 skipped_size = LRC_PPHWSP_SZ * PAGE_SIZE + LR_HW_CONTEXT_SIZE;
91 u32 base;
92
93 GEM_BUG_ON(guc->ads_vma);
94
95 vma = intel_guc_allocate_vma(guc, PAGE_ALIGN(sizeof(*blob)));
96 if (IS_ERR(vma))
97 return PTR_ERR(vma);
98
99 guc->ads_vma = vma;
100
101 page = i915_vma_first_page(vma);
102 blob = kmap(page);
103
104 /* GuC scheduling policies */
105 guc_policies_init(&blob->policies);
106
107 /* MMIO reg state */
108 for_each_engine(engine, dev_priv, id) {
109 blob->reg_state.white_list[engine->guc_id].mmio_start =
110 engine->mmio_base + GUC_MMIO_WHITE_LIST_START;
111
112 /* Nothing to be saved or restored for now. */
113 blob->reg_state.white_list[engine->guc_id].count = 0;
114 }
115
116 /*
117 * The GuC requires a "Golden Context" when it reinitialises
118 * engines after a reset. Here we use the Render ring default
119 * context, which must already exist and be pinned in the GGTT,
120 * so its address won't change after we've told the GuC where
121 * to find it. Note that we have to skip our header (1 page),
122 * because our GuC shared data is there.
123 */
124 kernel_ctx_vma = to_intel_context(dev_priv->kernel_context,
125 dev_priv->engine[RCS])->state;
126 blob->ads.golden_context_lrca =
127 intel_guc_ggtt_offset(guc, kernel_ctx_vma) + skipped_offset;
128
129 /*
130 * The GuC expects us to exclude the portion of the context image that
131 * it skips from the size it is to read. It starts reading from after
132 * the execlist context (so skipping the first page [PPHWSP] and 80
133 * dwords). Weird guc is weird.
134 */
135 for_each_engine(engine, dev_priv, id)
136 blob->ads.eng_state_size[engine->guc_id] =
137 engine->context_size - skipped_size;
138
139 base = intel_guc_ggtt_offset(guc, vma);
140 blob->ads.scheduler_policies = base + ptr_offset(blob, policies);
141 blob->ads.reg_state_buffer = base + ptr_offset(blob, reg_state_buffer);
142 blob->ads.reg_state_addr = base + ptr_offset(blob, reg_state);
143
144 kunmap(page);
145
146 return 0;
147}
148
149void intel_guc_ads_destroy(struct intel_guc *guc)
150{
151 i915_vma_unpin_and_release(&guc->ads_vma, 0);
152}