1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2020 Intel Corporation
4 */
5
6#include "gen2_engine_cs.h"
7#include "i915_drv.h"
8#include "i915_reg.h"
9#include "intel_engine.h"
10#include "intel_engine_regs.h"
11#include "intel_gpu_commands.h"
12#include "intel_gt.h"
13#include "intel_gt_irq.h"
14#include "intel_ring.h"
15
16int gen2_emit_flush(struct i915_request *rq, u32 mode)
17{
18 unsigned int num_store_dw = 12;
19 u32 cmd, *cs;
20
21 cmd = MI_FLUSH;
22 if (mode & EMIT_INVALIDATE)
23 cmd |= MI_READ_FLUSH;
24
25 cs = intel_ring_begin(rq, num_dwords: 2 + 4 * num_store_dw);
26 if (IS_ERR(ptr: cs))
27 return PTR_ERR(ptr: cs);
28
29 *cs++ = cmd;
30 while (num_store_dw--) {
31 *cs++ = MI_STORE_DWORD_INDEX;
32 *cs++ = I915_GEM_HWS_SCRATCH * sizeof(u32);
33 *cs++ = 0;
34 *cs++ = MI_FLUSH | MI_NO_WRITE_FLUSH;
35 }
36 *cs++ = cmd;
37
38 intel_ring_advance(rq, cs);
39
40 return 0;
41}
42
43int gen4_emit_flush_rcs(struct i915_request *rq, u32 mode)
44{
45 u32 cmd, *cs;
46 int i;
47
48 /*
49 * read/write caches:
50 *
51 * I915_GEM_DOMAIN_RENDER is always invalidated, but is
52 * only flushed if MI_NO_WRITE_FLUSH is unset. On 965, it is
53 * also flushed at 2d versus 3d pipeline switches.
54 *
55 * read-only caches:
56 *
57 * I915_GEM_DOMAIN_SAMPLER is flushed on pre-965 if
58 * MI_READ_FLUSH is set, and is always flushed on 965.
59 *
60 * I915_GEM_DOMAIN_COMMAND may not exist?
61 *
62 * I915_GEM_DOMAIN_INSTRUCTION, which exists on 965, is
63 * invalidated when MI_EXE_FLUSH is set.
64 *
65 * I915_GEM_DOMAIN_VERTEX, which exists on 965, is
66 * invalidated with every MI_FLUSH.
67 *
68 * TLBs:
69 *
70 * On 965, TLBs associated with I915_GEM_DOMAIN_COMMAND
71 * and I915_GEM_DOMAIN_CPU in are invalidated at PTE write and
72 * I915_GEM_DOMAIN_RENDER and I915_GEM_DOMAIN_SAMPLER
73 * are flushed at any MI_FLUSH.
74 */
75
76 cmd = MI_FLUSH;
77 if (mode & EMIT_INVALIDATE) {
78 cmd |= MI_EXE_FLUSH;
79 if (IS_G4X(rq->i915) || GRAPHICS_VER(rq->i915) == 5)
80 cmd |= MI_INVALIDATE_ISP;
81 }
82
83 i = 2;
84 if (mode & EMIT_INVALIDATE)
85 i += 20;
86
87 cs = intel_ring_begin(rq, num_dwords: i);
88 if (IS_ERR(ptr: cs))
89 return PTR_ERR(ptr: cs);
90
91 *cs++ = cmd;
92
93 /*
94 * A random delay to let the CS invalidate take effect? Without this
95 * delay, the GPU relocation path fails as the CS does not see
96 * the updated contents. Just as important, if we apply the flushes
97 * to the EMIT_FLUSH branch (i.e. immediately after the relocation
98 * write and before the invalidate on the next batch), the relocations
99 * still fail. This implies that is a delay following invalidation
100 * that is required to reset the caches as opposed to a delay to
101 * ensure the memory is written.
102 */
103 if (mode & EMIT_INVALIDATE) {
104 *cs++ = GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE;
105 *cs++ = intel_gt_scratch_offset(gt: rq->engine->gt,
106 field: INTEL_GT_SCRATCH_FIELD_DEFAULT) |
107 PIPE_CONTROL_GLOBAL_GTT;
108 *cs++ = 0;
109 *cs++ = 0;
110
111 for (i = 0; i < 12; i++)
112 *cs++ = MI_FLUSH;
113
114 *cs++ = GFX_OP_PIPE_CONTROL(4) | PIPE_CONTROL_QW_WRITE;
115 *cs++ = intel_gt_scratch_offset(gt: rq->engine->gt,
116 field: INTEL_GT_SCRATCH_FIELD_DEFAULT) |
117 PIPE_CONTROL_GLOBAL_GTT;
118 *cs++ = 0;
119 *cs++ = 0;
120 }
121
122 *cs++ = cmd;
123
124 intel_ring_advance(rq, cs);
125
126 return 0;
127}
128
129int gen4_emit_flush_vcs(struct i915_request *rq, u32 mode)
130{
131 u32 *cs;
132
133 cs = intel_ring_begin(rq, num_dwords: 2);
134 if (IS_ERR(ptr: cs))
135 return PTR_ERR(ptr: cs);
136
137 *cs++ = MI_FLUSH;
138 *cs++ = MI_NOOP;
139 intel_ring_advance(rq, cs);
140
141 return 0;
142}
143
144static u32 *__gen2_emit_breadcrumb(struct i915_request *rq, u32 *cs,
145 int flush, int post)
146{
147 GEM_BUG_ON(i915_request_active_timeline(rq)->hwsp_ggtt != rq->engine->status_page.vma);
148 GEM_BUG_ON(offset_in_page(rq->hwsp_seqno) != I915_GEM_HWS_SEQNO_ADDR);
149
150 *cs++ = MI_FLUSH;
151
152 while (flush--) {
153 *cs++ = MI_STORE_DWORD_INDEX;
154 *cs++ = I915_GEM_HWS_SCRATCH * sizeof(u32);
155 *cs++ = rq->fence.seqno;
156 }
157
158 while (post--) {
159 *cs++ = MI_STORE_DWORD_INDEX;
160 *cs++ = I915_GEM_HWS_SEQNO_ADDR;
161 *cs++ = rq->fence.seqno;
162 }
163
164 *cs++ = MI_USER_INTERRUPT;
165
166 rq->tail = intel_ring_offset(rq, addr: cs);
167 assert_ring_tail_valid(ring: rq->ring, tail: rq->tail);
168
169 return cs;
170}
171
172u32 *gen2_emit_breadcrumb(struct i915_request *rq, u32 *cs)
173{
174 return __gen2_emit_breadcrumb(rq, cs, flush: 16, post: 8);
175}
176
177u32 *gen5_emit_breadcrumb(struct i915_request *rq, u32 *cs)
178{
179 return __gen2_emit_breadcrumb(rq, cs, flush: 8, post: 8);
180}
181
182/* Just userspace ABI convention to limit the wa batch bo to a reasonable size */
183#define I830_BATCH_LIMIT SZ_256K
184#define I830_TLB_ENTRIES (2)
185#define I830_WA_SIZE max(I830_TLB_ENTRIES * SZ_4K, I830_BATCH_LIMIT)
186int i830_emit_bb_start(struct i915_request *rq,
187 u64 offset, u32 len,
188 unsigned int dispatch_flags)
189{
190 u32 *cs, cs_offset =
191 intel_gt_scratch_offset(gt: rq->engine->gt,
192 field: INTEL_GT_SCRATCH_FIELD_DEFAULT);
193
194 GEM_BUG_ON(rq->engine->gt->scratch->size < I830_WA_SIZE);
195
196 cs = intel_ring_begin(rq, num_dwords: 6);
197 if (IS_ERR(ptr: cs))
198 return PTR_ERR(ptr: cs);
199
200 /* Evict the invalid PTE TLBs */
201 *cs++ = COLOR_BLT_CMD | BLT_WRITE_RGBA;
202 *cs++ = BLT_DEPTH_32 | BLT_ROP_COLOR_COPY | 4096;
203 *cs++ = I830_TLB_ENTRIES << 16 | 4; /* load each page */
204 *cs++ = cs_offset;
205 *cs++ = 0xdeadbeef;
206 *cs++ = MI_NOOP;
207 intel_ring_advance(rq, cs);
208
209 if ((dispatch_flags & I915_DISPATCH_PINNED) == 0) {
210 if (len > I830_BATCH_LIMIT)
211 return -ENOSPC;
212
213 cs = intel_ring_begin(rq, num_dwords: 6 + 2);
214 if (IS_ERR(ptr: cs))
215 return PTR_ERR(ptr: cs);
216
217 /*
218 * Blit the batch (which has now all relocs applied) to the
219 * stable batch scratch bo area (so that the CS never
220 * stumbles over its tlb invalidation bug) ...
221 */
222 *cs++ = SRC_COPY_BLT_CMD | BLT_WRITE_RGBA | (6 - 2);
223 *cs++ = BLT_DEPTH_32 | BLT_ROP_SRC_COPY | 4096;
224 *cs++ = DIV_ROUND_UP(len, 4096) << 16 | 4096;
225 *cs++ = cs_offset;
226 *cs++ = 4096;
227 *cs++ = offset;
228
229 *cs++ = MI_FLUSH;
230 *cs++ = MI_NOOP;
231 intel_ring_advance(rq, cs);
232
233 /* ... and execute it. */
234 offset = cs_offset;
235 }
236
237 if (!(dispatch_flags & I915_DISPATCH_SECURE))
238 offset |= MI_BATCH_NON_SECURE;
239
240 cs = intel_ring_begin(rq, num_dwords: 2);
241 if (IS_ERR(ptr: cs))
242 return PTR_ERR(ptr: cs);
243
244 *cs++ = MI_BATCH_BUFFER_START | MI_BATCH_GTT;
245 *cs++ = offset;
246 intel_ring_advance(rq, cs);
247
248 return 0;
249}
250
251int gen2_emit_bb_start(struct i915_request *rq,
252 u64 offset, u32 len,
253 unsigned int dispatch_flags)
254{
255 u32 *cs;
256
257 if (!(dispatch_flags & I915_DISPATCH_SECURE))
258 offset |= MI_BATCH_NON_SECURE;
259
260 cs = intel_ring_begin(rq, num_dwords: 2);
261 if (IS_ERR(ptr: cs))
262 return PTR_ERR(ptr: cs);
263
264 *cs++ = MI_BATCH_BUFFER_START | MI_BATCH_GTT;
265 *cs++ = offset;
266 intel_ring_advance(rq, cs);
267
268 return 0;
269}
270
271int gen4_emit_bb_start(struct i915_request *rq,
272 u64 offset, u32 length,
273 unsigned int dispatch_flags)
274{
275 u32 security;
276 u32 *cs;
277
278 security = MI_BATCH_NON_SECURE_I965;
279 if (dispatch_flags & I915_DISPATCH_SECURE)
280 security = 0;
281
282 cs = intel_ring_begin(rq, num_dwords: 2);
283 if (IS_ERR(ptr: cs))
284 return PTR_ERR(ptr: cs);
285
286 *cs++ = MI_BATCH_BUFFER_START | MI_BATCH_GTT | security;
287 *cs++ = offset;
288 intel_ring_advance(rq, cs);
289
290 return 0;
291}
292
293void gen2_irq_enable(struct intel_engine_cs *engine)
294{
295 engine->i915->gen2_imr_mask &= ~engine->irq_enable_mask;
296 intel_uncore_write(uncore: engine->uncore, GEN2_IMR, val: engine->i915->gen2_imr_mask);
297 intel_uncore_posting_read_fw(engine->uncore, GEN2_IMR);
298}
299
300void gen2_irq_disable(struct intel_engine_cs *engine)
301{
302 engine->i915->gen2_imr_mask |= engine->irq_enable_mask;
303 intel_uncore_write(uncore: engine->uncore, GEN2_IMR, val: engine->i915->gen2_imr_mask);
304}
305
306void gen5_irq_enable(struct intel_engine_cs *engine)
307{
308 gen5_gt_enable_irq(gt: engine->gt, mask: engine->irq_enable_mask);
309}
310
311void gen5_irq_disable(struct intel_engine_cs *engine)
312{
313 gen5_gt_disable_irq(gt: engine->gt, mask: engine->irq_enable_mask);
314}
315

source code of linux/drivers/gpu/drm/i915/gt/gen2_engine_cs.c