2 * Copyright 2013 Advanced Micro Devices, Inc.
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 * on the rights to use, copy, modify, merge, publish, distribute, sub
8 * license, and/or sell copies of the Software, and to permit persons to whom
9 * the 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 NON-INFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
21 * USE OR OTHER DEALINGS IN THE SOFTWARE.
24 * Marek Olšák <maraeo@gmail.com>
29 #include "radeon/r600_cs.h"
31 /* Alignment for optimal performance. */
32 #define CP_DMA_ALIGNMENT 32
33 /* The max number of bytes to copy per packet. */
34 #define CP_DMA_MAX_BYTE_COUNT ((1 << 21) - CP_DMA_ALIGNMENT)
36 /* Set this if you want the ME to wait until CP DMA is done.
37 * It should be set on the last CP DMA packet. */
38 #define CP_DMA_SYNC (1 << 0)
40 /* Set this if the source data was used as a destination in a previous CP DMA
41 * packet. It's for preventing a read-after-write (RAW) hazard between two
43 #define CP_DMA_RAW_WAIT (1 << 1)
44 #define CP_DMA_USE_L2 (1 << 2) /* CIK+ */
45 #define CP_DMA_CLEAR (1 << 3)
47 /* Emit a CP DMA packet to do a copy from one buffer to another, or to clear
48 * a buffer. The size must fit in bits [20:0]. If CP_DMA_CLEAR is set, src_va is a 32-bit
51 static void si_emit_cp_dma(struct si_context
*sctx
, uint64_t dst_va
,
52 uint64_t src_va
, unsigned size
, unsigned flags
,
53 enum r600_coherency coher
)
55 struct radeon_winsys_cs
*cs
= sctx
->b
.gfx
.cs
;
56 uint32_t header
= 0, command
= S_414_BYTE_COUNT(size
);
59 assert(size
<= CP_DMA_MAX_BYTE_COUNT
);
62 if (flags
& CP_DMA_SYNC
)
63 header
|= S_411_CP_SYNC(1);
65 command
|= S_414_DISABLE_WR_CONFIRM(1);
67 if (flags
& CP_DMA_RAW_WAIT
)
68 command
|= S_414_RAW_WAIT(1);
70 /* Src and dst flags. */
71 if (flags
& CP_DMA_USE_L2
)
72 header
|= S_411_DSL_SEL(V_411_DST_ADDR_TC_L2
);
74 if (flags
& CP_DMA_CLEAR
)
75 header
|= S_411_SRC_SEL(V_411_DATA
);
76 else if (flags
& CP_DMA_USE_L2
)
77 header
|= S_411_SRC_SEL(V_411_SRC_ADDR_TC_L2
);
79 if (sctx
->b
.chip_class
>= CIK
) {
80 radeon_emit(cs
, PKT3(PKT3_DMA_DATA
, 5, 0));
81 radeon_emit(cs
, header
);
82 radeon_emit(cs
, src_va
); /* SRC_ADDR_LO [31:0] */
83 radeon_emit(cs
, src_va
>> 32); /* SRC_ADDR_HI [31:0] */
84 radeon_emit(cs
, dst_va
); /* DST_ADDR_LO [31:0] */
85 radeon_emit(cs
, dst_va
>> 32); /* DST_ADDR_HI [31:0] */
86 radeon_emit(cs
, command
);
88 header
|= S_411_SRC_ADDR_HI(src_va
>> 32);
90 radeon_emit(cs
, PKT3(PKT3_CP_DMA
, 4, 0));
91 radeon_emit(cs
, src_va
); /* SRC_ADDR_LO [31:0] */
92 radeon_emit(cs
, header
); /* SRC_ADDR_HI [15:0] + flags. */
93 radeon_emit(cs
, dst_va
); /* DST_ADDR_LO [31:0] */
94 radeon_emit(cs
, (dst_va
>> 32) & 0xffff); /* DST_ADDR_HI [15:0] */
95 radeon_emit(cs
, command
);
98 /* CP DMA is executed in ME, but index buffers are read by PFP.
99 * This ensures that ME (CP DMA) is idle before PFP starts fetching
100 * indices. If we wanted to execute CP DMA in PFP, this packet
103 if (coher
== R600_COHERENCY_SHADER
&& flags
& CP_DMA_SYNC
) {
104 radeon_emit(cs
, PKT3(PKT3_PFP_SYNC_ME
, 0, 0));
109 static unsigned get_flush_flags(struct si_context
*sctx
, enum r600_coherency coher
)
113 case R600_COHERENCY_NONE
:
115 case R600_COHERENCY_SHADER
:
116 return SI_CONTEXT_INV_SMEM_L1
|
117 SI_CONTEXT_INV_VMEM_L1
|
118 (sctx
->b
.chip_class
== SI
? SI_CONTEXT_INV_GLOBAL_L2
: 0);
119 case R600_COHERENCY_CB_META
:
120 return SI_CONTEXT_FLUSH_AND_INV_CB
|
121 SI_CONTEXT_FLUSH_AND_INV_CB_META
;
125 static unsigned get_tc_l2_flag(struct si_context
*sctx
, enum r600_coherency coher
)
127 return coher
== R600_COHERENCY_SHADER
&&
128 sctx
->b
.chip_class
>= CIK
? CP_DMA_USE_L2
: 0;
131 static void si_cp_dma_prepare(struct si_context
*sctx
, struct pipe_resource
*dst
,
132 struct pipe_resource
*src
, unsigned byte_count
,
133 uint64_t remaining_size
, unsigned user_flags
,
134 bool *is_first
, unsigned *packet_flags
)
136 /* Count memory usage in so that need_cs_space can take it into account. */
137 r600_context_add_resource_size(&sctx
->b
.b
, dst
);
139 r600_context_add_resource_size(&sctx
->b
.b
, src
);
141 if (!(user_flags
& SI_CPDMA_SKIP_CHECK_CS_SPACE
))
142 si_need_cs_space(sctx
);
144 /* This must be done after need_cs_space. */
145 radeon_add_to_buffer_list(&sctx
->b
, &sctx
->b
.gfx
,
146 (struct r600_resource
*)dst
,
147 RADEON_USAGE_WRITE
, RADEON_PRIO_CP_DMA
);
149 radeon_add_to_buffer_list(&sctx
->b
, &sctx
->b
.gfx
,
150 (struct r600_resource
*)src
,
151 RADEON_USAGE_READ
, RADEON_PRIO_CP_DMA
);
153 /* Flush the caches for the first copy only.
154 * Also wait for the previous CP DMA operations.
156 if (!(user_flags
& SI_CPDMA_SKIP_GFX_SYNC
) && sctx
->b
.flags
)
157 si_emit_cache_flush(sctx
);
159 if (!(user_flags
& SI_CPDMA_SKIP_SYNC_BEFORE
) && *is_first
)
160 *packet_flags
|= CP_DMA_RAW_WAIT
;
164 /* Do the synchronization after the last dma, so that all data
165 * is written to memory.
167 if (!(user_flags
& SI_CPDMA_SKIP_SYNC_AFTER
) &&
168 byte_count
== remaining_size
)
169 *packet_flags
|= CP_DMA_SYNC
;
172 static void si_clear_buffer(struct pipe_context
*ctx
, struct pipe_resource
*dst
,
173 uint64_t offset
, uint64_t size
, unsigned value
,
174 enum r600_coherency coher
)
176 struct si_context
*sctx
= (struct si_context
*)ctx
;
177 struct radeon_winsys
*ws
= sctx
->b
.ws
;
178 struct r600_resource
*rdst
= r600_resource(dst
);
179 unsigned tc_l2_flag
= get_tc_l2_flag(sctx
, coher
);
180 unsigned flush_flags
= get_flush_flags(sctx
, coher
);
181 bool is_first
= true;
186 /* Mark the buffer range of destination as valid (initialized),
187 * so that transfer_map knows it should wait for the GPU when mapping
189 util_range_add(&rdst
->valid_buffer_range
, offset
,
192 /* Fallback for unaligned clears. */
193 if (offset
% 4 != 0 || size
% 4 != 0) {
194 uint8_t *map
= r600_buffer_map_sync_with_rings(&sctx
->b
, rdst
,
195 PIPE_TRANSFER_WRITE
);
197 for (uint64_t i
= 0; i
< size
; i
++) {
198 unsigned byte_within_dword
= (offset
+ i
) % 4;
199 *map
++ = (value
>> (byte_within_dword
* 8)) & 0xff;
204 /* dma_clear_buffer can use clear_buffer on failure. Make sure that
205 * doesn't happen. We don't want an infinite recursion: */
206 if (sctx
->b
.dma
.cs
&&
207 /* CP DMA is very slow. Always use SDMA for big clears. This
208 * alone improves DeusEx:MD performance by 70%. */
209 (size
> 128 * 1024 ||
210 /* Buffers not used by the GFX IB yet will be cleared by SDMA.
211 * This happens to move most buffer clears to SDMA, including
212 * DCC and CMASK clears, because pipe->clear clears them before
213 * si_emit_framebuffer_state (in a draw call) adds them.
214 * For example, DeusEx:MD has 21 buffer clears per frame and all
215 * of them are moved to SDMA thanks to this. */
216 !ws
->cs_is_buffer_referenced(sctx
->b
.gfx
.cs
, rdst
->buf
,
217 RADEON_USAGE_READWRITE
))) {
218 sctx
->b
.dma_clear_buffer(ctx
, dst
, offset
, size
, value
);
222 uint64_t va
= rdst
->gpu_address
+ offset
;
224 /* Flush the caches. */
225 sctx
->b
.flags
|= SI_CONTEXT_PS_PARTIAL_FLUSH
|
226 SI_CONTEXT_CS_PARTIAL_FLUSH
| flush_flags
;
229 unsigned byte_count
= MIN2(size
, CP_DMA_MAX_BYTE_COUNT
);
230 unsigned dma_flags
= tc_l2_flag
| CP_DMA_CLEAR
;
232 si_cp_dma_prepare(sctx
, dst
, NULL
, byte_count
, size
, 0,
233 &is_first
, &dma_flags
);
235 /* Emit the clear packet. */
236 si_emit_cp_dma(sctx
, va
, value
, byte_count
, dma_flags
, coher
);
243 rdst
->TC_L2_dirty
= true;
245 /* If it's not a framebuffer fast clear... */
246 if (coher
== R600_COHERENCY_SHADER
)
247 sctx
->b
.num_cp_dma_calls
++;
251 * Realign the CP DMA engine. This must be done after a copy with an unaligned
254 * \param size Remaining size to the CP DMA alignment.
256 static void si_cp_dma_realign_engine(struct si_context
*sctx
, unsigned size
,
257 unsigned user_flags
, bool *is_first
)
260 unsigned dma_flags
= 0;
261 unsigned scratch_size
= CP_DMA_ALIGNMENT
* 2;
263 assert(size
< CP_DMA_ALIGNMENT
);
265 /* Use the scratch buffer as the dummy buffer. The 3D engine should be
266 * idle at this point.
268 if (!sctx
->scratch_buffer
||
269 sctx
->scratch_buffer
->b
.b
.width0
< scratch_size
) {
270 r600_resource_reference(&sctx
->scratch_buffer
, NULL
);
271 sctx
->scratch_buffer
= (struct r600_resource
*)
272 pipe_buffer_create(&sctx
->screen
->b
.b
, 0,
273 PIPE_USAGE_DEFAULT
, scratch_size
);
274 if (!sctx
->scratch_buffer
)
276 sctx
->emit_scratch_reloc
= true;
279 si_cp_dma_prepare(sctx
, &sctx
->scratch_buffer
->b
.b
,
280 &sctx
->scratch_buffer
->b
.b
, size
, size
, user_flags
,
281 is_first
, &dma_flags
);
283 va
= sctx
->scratch_buffer
->gpu_address
;
284 si_emit_cp_dma(sctx
, va
, va
+ CP_DMA_ALIGNMENT
, size
, dma_flags
,
285 R600_COHERENCY_SHADER
);
289 * Do memcpy between buffers using CP DMA.
291 * \param user_flags bitmask of SI_CPDMA_*
293 void si_copy_buffer(struct si_context
*sctx
,
294 struct pipe_resource
*dst
, struct pipe_resource
*src
,
295 uint64_t dst_offset
, uint64_t src_offset
, unsigned size
,
298 uint64_t main_dst_offset
, main_src_offset
;
299 unsigned skipped_size
= 0;
300 unsigned realign_size
= 0;
301 unsigned tc_l2_flag
= get_tc_l2_flag(sctx
, R600_COHERENCY_SHADER
);
302 unsigned flush_flags
= get_flush_flags(sctx
, R600_COHERENCY_SHADER
);
303 bool is_first
= true;
308 /* Mark the buffer range of destination as valid (initialized),
309 * so that transfer_map knows it should wait for the GPU when mapping
311 util_range_add(&r600_resource(dst
)->valid_buffer_range
, dst_offset
,
314 dst_offset
+= r600_resource(dst
)->gpu_address
;
315 src_offset
+= r600_resource(src
)->gpu_address
;
317 /* The workarounds aren't needed on Fiji and beyond. */
318 if (sctx
->b
.family
<= CHIP_CARRIZO
||
319 sctx
->b
.family
== CHIP_STONEY
) {
320 /* If the size is not aligned, we must add a dummy copy at the end
321 * just to align the internal counter. Otherwise, the DMA engine
322 * would slow down by an order of magnitude for following copies.
324 if (size
% CP_DMA_ALIGNMENT
)
325 realign_size
= CP_DMA_ALIGNMENT
- (size
% CP_DMA_ALIGNMENT
);
327 /* If the copy begins unaligned, we must start copying from the next
328 * aligned block and the skipped part should be copied after everything
329 * else has been copied. Only the src alignment matters, not dst.
331 if (src_offset
% CP_DMA_ALIGNMENT
) {
332 skipped_size
= CP_DMA_ALIGNMENT
- (src_offset
% CP_DMA_ALIGNMENT
);
333 /* The main part will be skipped if the size is too small. */
334 skipped_size
= MIN2(skipped_size
, size
);
335 size
-= skipped_size
;
339 /* Flush the caches. */
340 if (!(user_flags
& SI_CPDMA_SKIP_GFX_SYNC
))
341 sctx
->b
.flags
|= SI_CONTEXT_PS_PARTIAL_FLUSH
|
342 SI_CONTEXT_CS_PARTIAL_FLUSH
| flush_flags
;
344 /* This is the main part doing the copying. Src is always aligned. */
345 main_dst_offset
= dst_offset
+ skipped_size
;
346 main_src_offset
= src_offset
+ skipped_size
;
349 unsigned dma_flags
= tc_l2_flag
;
350 unsigned byte_count
= MIN2(size
, CP_DMA_MAX_BYTE_COUNT
);
352 si_cp_dma_prepare(sctx
, dst
, src
, byte_count
,
353 size
+ skipped_size
+ realign_size
,
354 user_flags
, &is_first
, &dma_flags
);
356 si_emit_cp_dma(sctx
, main_dst_offset
, main_src_offset
,
357 byte_count
, dma_flags
, R600_COHERENCY_SHADER
);
360 main_src_offset
+= byte_count
;
361 main_dst_offset
+= byte_count
;
364 /* Copy the part we skipped because src wasn't aligned. */
366 unsigned dma_flags
= tc_l2_flag
;
368 si_cp_dma_prepare(sctx
, dst
, src
, skipped_size
,
369 skipped_size
+ realign_size
, user_flags
,
370 &is_first
, &dma_flags
);
372 si_emit_cp_dma(sctx
, dst_offset
, src_offset
, skipped_size
,
373 dma_flags
, R600_COHERENCY_SHADER
);
376 /* Finally, realign the engine if the size wasn't aligned. */
378 si_cp_dma_realign_engine(sctx
, realign_size
, user_flags
,
382 r600_resource(dst
)->TC_L2_dirty
= true;
384 /* If it's not a prefetch... */
385 if (dst_offset
!= src_offset
)
386 sctx
->b
.num_cp_dma_calls
++;
389 void cik_prefetch_TC_L2_async(struct si_context
*sctx
, struct pipe_resource
*buf
,
390 uint64_t offset
, unsigned size
)
392 assert(sctx
->b
.chip_class
>= CIK
);
394 si_copy_buffer(sctx
, buf
, buf
, offset
, offset
, size
,
395 SI_CPDMA_SKIP_CHECK_CS_SPACE
|
396 SI_CPDMA_SKIP_SYNC_AFTER
|
397 SI_CPDMA_SKIP_SYNC_BEFORE
|
398 SI_CPDMA_SKIP_GFX_SYNC
);
401 void si_init_cp_dma_functions(struct si_context
*sctx
)
403 sctx
->b
.clear_buffer
= si_clear_buffer
;