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673a394b EA |
1 | /* |
2 | * Copyright © 2008 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 | * Authors: | |
24 | * Eric Anholt <eric@anholt.net> | |
25 | * | |
26 | */ | |
27 | ||
760285e7 DH |
28 | #include <linux/string.h> |
29 | #include <linux/bitops.h> | |
30 | #include <drm/drmP.h> | |
31 | #include <drm/i915_drm.h> | |
673a394b EA |
32 | #include "i915_drv.h" |
33 | ||
34 | /** @file i915_gem_tiling.c | |
35 | * | |
36 | * Support for managing tiling state of buffer objects. | |
37 | * | |
38 | * The idea behind tiling is to increase cache hit rates by rearranging | |
39 | * pixel data so that a group of pixel accesses are in the same cacheline. | |
40 | * Performance improvement from doing this on the back/depth buffer are on | |
41 | * the order of 30%. | |
42 | * | |
43 | * Intel architectures make this somewhat more complicated, though, by | |
44 | * adjustments made to addressing of data when the memory is in interleaved | |
45 | * mode (matched pairs of DIMMS) to improve memory bandwidth. | |
46 | * For interleaved memory, the CPU sends every sequential 64 bytes | |
47 | * to an alternate memory channel so it can get the bandwidth from both. | |
48 | * | |
49 | * The GPU also rearranges its accesses for increased bandwidth to interleaved | |
50 | * memory, and it matches what the CPU does for non-tiled. However, when tiled | |
51 | * it does it a little differently, since one walks addresses not just in the | |
52 | * X direction but also Y. So, along with alternating channels when bit | |
53 | * 6 of the address flips, it also alternates when other bits flip -- Bits 9 | |
54 | * (every 512 bytes, an X tile scanline) and 10 (every two X tile scanlines) | |
55 | * are common to both the 915 and 965-class hardware. | |
56 | * | |
57 | * The CPU also sometimes XORs in higher bits as well, to improve | |
58 | * bandwidth doing strided access like we do so frequently in graphics. This | |
59 | * is called "Channel XOR Randomization" in the MCH documentation. The result | |
60 | * is that the CPU is XORing in either bit 11 or bit 17 to bit 6 of its address | |
61 | * decode. | |
62 | * | |
63 | * All of this bit 6 XORing has an effect on our memory management, | |
64 | * as we need to make sure that the 3d driver can correctly address object | |
65 | * contents. | |
66 | * | |
67 | * If we don't have interleaved memory, all tiling is safe and no swizzling is | |
68 | * required. | |
69 | * | |
70 | * When bit 17 is XORed in, we simply refuse to tile at all. Bit | |
71 | * 17 is not just a page offset, so as we page an objet out and back in, | |
72 | * individual pages in it will have different bit 17 addresses, resulting in | |
73 | * each 64 bytes being swapped with its neighbor! | |
74 | * | |
75 | * Otherwise, if interleaved, we have to tell the 3d driver what the address | |
76 | * swizzling it needs to do is, since it's writing with the CPU to the pages | |
77 | * (bit 6 and potentially bit 11 XORed in), and the GPU is reading from the | |
78 | * pages (bit 6, 9, and 10 XORed in), resulting in a cumulative bit swizzling | |
79 | * required by the CPU of XORing in bit 6, 9, 10, and potentially 11, in order | |
80 | * to match what the GPU expects. | |
81 | */ | |
82 | ||
83 | /** | |
84 | * Detects bit 6 swizzling of address lookup between IGD access and CPU | |
85 | * access through main memory. | |
86 | */ | |
87 | void | |
88 | i915_gem_detect_bit_6_swizzle(struct drm_device *dev) | |
89 | { | |
50227e1c | 90 | struct drm_i915_private *dev_priv = dev->dev_private; |
673a394b EA |
91 | uint32_t swizzle_x = I915_BIT_6_SWIZZLE_UNKNOWN; |
92 | uint32_t swizzle_y = I915_BIT_6_SWIZZLE_UNKNOWN; | |
93 | ||
be292e15 DL |
94 | if (INTEL_INFO(dev)->gen >= 8 || IS_VALLEYVIEW(dev)) { |
95 | /* | |
96 | * On BDW+, swizzling is not used. We leave the CPU memory | |
97 | * controller in charge of optimizing memory accesses without | |
98 | * the extra address manipulation GPU side. | |
99 | * | |
100 | * VLV and CHV don't have GPU swizzling. | |
101 | */ | |
7f661341 JB |
102 | swizzle_x = I915_BIT_6_SWIZZLE_NONE; |
103 | swizzle_y = I915_BIT_6_SWIZZLE_NONE; | |
104 | } else if (INTEL_INFO(dev)->gen >= 6) { | |
d9ceb816 JB |
105 | if (dev_priv->preserve_bios_swizzle) { |
106 | if (I915_READ(DISP_ARB_CTL) & | |
107 | DISP_TILE_SURFACE_SWIZZLING) { | |
108 | swizzle_x = I915_BIT_6_SWIZZLE_9_10; | |
109 | swizzle_y = I915_BIT_6_SWIZZLE_9; | |
110 | } else { | |
111 | swizzle_x = I915_BIT_6_SWIZZLE_NONE; | |
112 | swizzle_y = I915_BIT_6_SWIZZLE_NONE; | |
113 | } | |
f691e2f4 | 114 | } else { |
d9ceb816 JB |
115 | uint32_t dimm_c0, dimm_c1; |
116 | dimm_c0 = I915_READ(MAD_DIMM_C0); | |
117 | dimm_c1 = I915_READ(MAD_DIMM_C1); | |
118 | dimm_c0 &= MAD_DIMM_A_SIZE_MASK | MAD_DIMM_B_SIZE_MASK; | |
119 | dimm_c1 &= MAD_DIMM_A_SIZE_MASK | MAD_DIMM_B_SIZE_MASK; | |
120 | /* Enable swizzling when the channels are populated | |
121 | * with identically sized dimms. We don't need to check | |
122 | * the 3rd channel because no cpu with gpu attached | |
123 | * ships in that configuration. Also, swizzling only | |
124 | * makes sense for 2 channels anyway. */ | |
125 | if (dimm_c0 == dimm_c1) { | |
126 | swizzle_x = I915_BIT_6_SWIZZLE_9_10; | |
127 | swizzle_y = I915_BIT_6_SWIZZLE_9; | |
128 | } else { | |
129 | swizzle_x = I915_BIT_6_SWIZZLE_NONE; | |
130 | swizzle_y = I915_BIT_6_SWIZZLE_NONE; | |
131 | } | |
f691e2f4 | 132 | } |
acc83eb5 | 133 | } else if (IS_GEN5(dev)) { |
f2b115e6 | 134 | /* On Ironlake whatever DRAM config, GPU always do |
553bd149 ZW |
135 | * same swizzling setup. |
136 | */ | |
137 | swizzle_x = I915_BIT_6_SWIZZLE_9_10; | |
138 | swizzle_y = I915_BIT_6_SWIZZLE_9; | |
a6c45cf0 | 139 | } else if (IS_GEN2(dev)) { |
673a394b EA |
140 | /* As far as we know, the 865 doesn't have these bit 6 |
141 | * swizzling issues. | |
142 | */ | |
143 | swizzle_x = I915_BIT_6_SWIZZLE_NONE; | |
144 | swizzle_y = I915_BIT_6_SWIZZLE_NONE; | |
c9c4b6f6 | 145 | } else if (IS_MOBILE(dev) || (IS_GEN3(dev) && !IS_G33(dev))) { |
673a394b EA |
146 | uint32_t dcc; |
147 | ||
c9c4b6f6 | 148 | /* On 9xx chipsets, channel interleave by the CPU is |
568d9a8f EA |
149 | * determined by DCC. For single-channel, neither the CPU |
150 | * nor the GPU do swizzling. For dual channel interleaved, | |
151 | * the GPU's interleave is bit 9 and 10 for X tiled, and bit | |
152 | * 9 for Y tiled. The CPU's interleave is independent, and | |
153 | * can be based on either bit 11 (haven't seen this yet) or | |
154 | * bit 17 (common). | |
673a394b EA |
155 | */ |
156 | dcc = I915_READ(DCC); | |
157 | switch (dcc & DCC_ADDRESSING_MODE_MASK) { | |
158 | case DCC_ADDRESSING_MODE_SINGLE_CHANNEL: | |
159 | case DCC_ADDRESSING_MODE_DUAL_CHANNEL_ASYMMETRIC: | |
160 | swizzle_x = I915_BIT_6_SWIZZLE_NONE; | |
161 | swizzle_y = I915_BIT_6_SWIZZLE_NONE; | |
162 | break; | |
163 | case DCC_ADDRESSING_MODE_DUAL_CHANNEL_INTERLEAVED: | |
568d9a8f EA |
164 | if (dcc & DCC_CHANNEL_XOR_DISABLE) { |
165 | /* This is the base swizzling by the GPU for | |
166 | * tiled buffers. | |
167 | */ | |
673a394b EA |
168 | swizzle_x = I915_BIT_6_SWIZZLE_9_10; |
169 | swizzle_y = I915_BIT_6_SWIZZLE_9; | |
568d9a8f EA |
170 | } else if ((dcc & DCC_CHANNEL_XOR_BIT_17) == 0) { |
171 | /* Bit 11 swizzling by the CPU in addition. */ | |
673a394b EA |
172 | swizzle_x = I915_BIT_6_SWIZZLE_9_10_11; |
173 | swizzle_y = I915_BIT_6_SWIZZLE_9_11; | |
174 | } else { | |
568d9a8f | 175 | /* Bit 17 swizzling by the CPU in addition. */ |
280b713b EA |
176 | swizzle_x = I915_BIT_6_SWIZZLE_9_10_17; |
177 | swizzle_y = I915_BIT_6_SWIZZLE_9_17; | |
673a394b EA |
178 | } |
179 | break; | |
180 | } | |
656bfa3a DV |
181 | |
182 | /* check for L-shaped memory aka modified enhanced addressing */ | |
183 | if (IS_GEN4(dev)) { | |
184 | uint32_t ddc2 = I915_READ(DCC2); | |
185 | ||
d82c0ba6 | 186 | if (!(ddc2 & DCC2_MODIFIED_ENHANCED_DISABLE)) |
656bfa3a DV |
187 | dev_priv->quirks |= QUIRK_PIN_SWIZZLED_PAGES; |
188 | } | |
189 | ||
673a394b EA |
190 | if (dcc == 0xffffffff) { |
191 | DRM_ERROR("Couldn't read from MCHBAR. " | |
192 | "Disabling tiling.\n"); | |
193 | swizzle_x = I915_BIT_6_SWIZZLE_UNKNOWN; | |
194 | swizzle_y = I915_BIT_6_SWIZZLE_UNKNOWN; | |
195 | } | |
196 | } else { | |
197 | /* The 965, G33, and newer, have a very flexible memory | |
198 | * configuration. It will enable dual-channel mode | |
199 | * (interleaving) on as much memory as it can, and the GPU | |
200 | * will additionally sometimes enable different bit 6 | |
201 | * swizzling for tiled objects from the CPU. | |
202 | * | |
203 | * Here's what I found on the G965: | |
204 | * slot fill memory size swizzling | |
205 | * 0A 0B 1A 1B 1-ch 2-ch | |
206 | * 512 0 0 0 512 0 O | |
207 | * 512 0 512 0 16 1008 X | |
208 | * 512 0 0 512 16 1008 X | |
209 | * 0 512 0 512 16 1008 X | |
210 | * 1024 1024 1024 0 2048 1024 O | |
211 | * | |
212 | * We could probably detect this based on either the DRB | |
213 | * matching, which was the case for the swizzling required in | |
214 | * the table above, or from the 1-ch value being less than | |
215 | * the minimum size of a rank. | |
216 | */ | |
217 | if (I915_READ16(C0DRB3) != I915_READ16(C1DRB3)) { | |
218 | swizzle_x = I915_BIT_6_SWIZZLE_NONE; | |
219 | swizzle_y = I915_BIT_6_SWIZZLE_NONE; | |
220 | } else { | |
221 | swizzle_x = I915_BIT_6_SWIZZLE_9_10; | |
222 | swizzle_y = I915_BIT_6_SWIZZLE_9; | |
223 | } | |
224 | } | |
225 | ||
226 | dev_priv->mm.bit_6_swizzle_x = swizzle_x; | |
227 | dev_priv->mm.bit_6_swizzle_y = swizzle_y; | |
228 | } | |
229 | ||
0f973f27 | 230 | /* Check pitch constriants for all chips & tiling formats */ |
a00b10c3 | 231 | static bool |
0f973f27 JB |
232 | i915_tiling_ok(struct drm_device *dev, int stride, int size, int tiling_mode) |
233 | { | |
0ee537ab | 234 | int tile_width; |
0f973f27 JB |
235 | |
236 | /* Linear is always fine */ | |
237 | if (tiling_mode == I915_TILING_NONE) | |
238 | return true; | |
239 | ||
a6c45cf0 | 240 | if (IS_GEN2(dev) || |
e76a16de | 241 | (tiling_mode == I915_TILING_Y && HAS_128_BYTE_Y_TILING(dev))) |
0f973f27 JB |
242 | tile_width = 128; |
243 | else | |
244 | tile_width = 512; | |
245 | ||
8d7773a3 | 246 | /* check maximum stride & object size */ |
3a062478 VS |
247 | /* i965+ stores the end address of the gtt mapping in the fence |
248 | * reg, so dont bother to check the size */ | |
249 | if (INTEL_INFO(dev)->gen >= 7) { | |
250 | if (stride / 128 > GEN7_FENCE_MAX_PITCH_VAL) | |
251 | return false; | |
252 | } else if (INTEL_INFO(dev)->gen >= 4) { | |
8d7773a3 DV |
253 | if (stride / 128 > I965_FENCE_MAX_PITCH_VAL) |
254 | return false; | |
a6c45cf0 | 255 | } else { |
c36a2a6d | 256 | if (stride > 8192) |
8d7773a3 | 257 | return false; |
e76a16de | 258 | |
c36a2a6d DV |
259 | if (IS_GEN3(dev)) { |
260 | if (size > I830_FENCE_MAX_SIZE_VAL << 20) | |
261 | return false; | |
262 | } else { | |
263 | if (size > I830_FENCE_MAX_SIZE_VAL << 19) | |
264 | return false; | |
265 | } | |
8d7773a3 DV |
266 | } |
267 | ||
fe48d8de VS |
268 | if (stride < tile_width) |
269 | return false; | |
270 | ||
0f973f27 | 271 | /* 965+ just needs multiples of tile width */ |
a6c45cf0 | 272 | if (INTEL_INFO(dev)->gen >= 4) { |
0f973f27 JB |
273 | if (stride & (tile_width - 1)) |
274 | return false; | |
275 | return true; | |
276 | } | |
277 | ||
278 | /* Pre-965 needs power of two tile widths */ | |
0f973f27 JB |
279 | if (stride & (stride - 1)) |
280 | return false; | |
281 | ||
0f973f27 JB |
282 | return true; |
283 | } | |
284 | ||
a00b10c3 CW |
285 | /* Is the current GTT allocation valid for the change in tiling? */ |
286 | static bool | |
05394f39 | 287 | i915_gem_object_fence_ok(struct drm_i915_gem_object *obj, int tiling_mode) |
52dc7d32 | 288 | { |
a00b10c3 | 289 | u32 size; |
52dc7d32 CW |
290 | |
291 | if (tiling_mode == I915_TILING_NONE) | |
292 | return true; | |
293 | ||
05394f39 | 294 | if (INTEL_INFO(obj->base.dev)->gen >= 4) |
a6c45cf0 CW |
295 | return true; |
296 | ||
05394f39 | 297 | if (INTEL_INFO(obj->base.dev)->gen == 3) { |
f343c5f6 | 298 | if (i915_gem_obj_ggtt_offset(obj) & ~I915_FENCE_START_MASK) |
df153158 CW |
299 | return false; |
300 | } else { | |
f343c5f6 | 301 | if (i915_gem_obj_ggtt_offset(obj) & ~I830_FENCE_START_MASK) |
df153158 CW |
302 | return false; |
303 | } | |
304 | ||
0fa87796 | 305 | size = i915_gem_get_gtt_size(obj->base.dev, obj->base.size, tiling_mode); |
f343c5f6 | 306 | if (i915_gem_obj_ggtt_size(obj) != size) |
a6c45cf0 CW |
307 | return false; |
308 | ||
f343c5f6 | 309 | if (i915_gem_obj_ggtt_offset(obj) & (size - 1)) |
df153158 | 310 | return false; |
52dc7d32 CW |
311 | |
312 | return true; | |
313 | } | |
314 | ||
673a394b EA |
315 | /** |
316 | * Sets the tiling mode of an object, returning the required swizzling of | |
317 | * bit 6 of addresses in the object. | |
318 | */ | |
319 | int | |
320 | i915_gem_set_tiling(struct drm_device *dev, void *data, | |
05394f39 | 321 | struct drm_file *file) |
673a394b EA |
322 | { |
323 | struct drm_i915_gem_set_tiling *args = data; | |
50227e1c | 324 | struct drm_i915_private *dev_priv = dev->dev_private; |
05394f39 | 325 | struct drm_i915_gem_object *obj; |
47ae63e0 | 326 | int ret = 0; |
673a394b | 327 | |
05394f39 | 328 | obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle)); |
c8725226 | 329 | if (&obj->base == NULL) |
bf79cb91 | 330 | return -ENOENT; |
673a394b | 331 | |
05394f39 CW |
332 | if (!i915_tiling_ok(dev, |
333 | args->stride, obj->base.size, args->tiling_mode)) { | |
334 | drm_gem_object_unreference_unlocked(&obj->base); | |
0f973f27 | 335 | return -EINVAL; |
72daad40 | 336 | } |
0f973f27 | 337 | |
6c31a614 | 338 | mutex_lock(&dev->struct_mutex); |
1f30a614 | 339 | if (obj->pin_display || obj->framebuffer_references) { |
6c31a614 CW |
340 | ret = -EBUSY; |
341 | goto err; | |
31770bd4 DV |
342 | } |
343 | ||
673a394b | 344 | if (args->tiling_mode == I915_TILING_NONE) { |
673a394b | 345 | args->swizzle_mode = I915_BIT_6_SWIZZLE_NONE; |
52dc7d32 | 346 | args->stride = 0; |
673a394b EA |
347 | } else { |
348 | if (args->tiling_mode == I915_TILING_X) | |
349 | args->swizzle_mode = dev_priv->mm.bit_6_swizzle_x; | |
350 | else | |
351 | args->swizzle_mode = dev_priv->mm.bit_6_swizzle_y; | |
280b713b EA |
352 | |
353 | /* Hide bit 17 swizzling from the user. This prevents old Mesa | |
354 | * from aborting the application on sw fallbacks to bit 17, | |
355 | * and we use the pread/pwrite bit17 paths to swizzle for it. | |
356 | * If there was a user that was relying on the swizzle | |
357 | * information for drm_intel_bo_map()ed reads/writes this would | |
358 | * break it, but we don't have any of those. | |
359 | */ | |
360 | if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_17) | |
361 | args->swizzle_mode = I915_BIT_6_SWIZZLE_9; | |
362 | if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_10_17) | |
363 | args->swizzle_mode = I915_BIT_6_SWIZZLE_9_10; | |
364 | ||
673a394b EA |
365 | /* If we can't handle the swizzling, make it untiled. */ |
366 | if (args->swizzle_mode == I915_BIT_6_SWIZZLE_UNKNOWN) { | |
367 | args->tiling_mode = I915_TILING_NONE; | |
368 | args->swizzle_mode = I915_BIT_6_SWIZZLE_NONE; | |
52dc7d32 | 369 | args->stride = 0; |
673a394b EA |
370 | } |
371 | } | |
0f973f27 | 372 | |
05394f39 CW |
373 | if (args->tiling_mode != obj->tiling_mode || |
374 | args->stride != obj->stride) { | |
52dc7d32 CW |
375 | /* We need to rebind the object if its current allocation |
376 | * no longer meets the alignment restrictions for its new | |
377 | * tiling mode. Otherwise we can just leave it alone, but | |
1869b620 CW |
378 | * need to ensure that any fence register is updated before |
379 | * the next fenced (either through the GTT or by the BLT unit | |
380 | * on older GPUs) access. | |
5d82e3e6 CW |
381 | * |
382 | * After updating the tiling parameters, we then flag whether | |
383 | * we need to update an associated fence register. Note this | |
384 | * has to also include the unfenced register the GPU uses | |
385 | * whilst executing a fenced command for an untiled object. | |
0f973f27 | 386 | */ |
e9d784d5 CW |
387 | if (obj->map_and_fenceable && |
388 | !i915_gem_object_fence_ok(obj, args->tiling_mode)) | |
389 | ret = i915_gem_object_ggtt_unbind(obj); | |
467cffba CW |
390 | |
391 | if (ret == 0) { | |
656bfa3a DV |
392 | if (obj->pages && |
393 | obj->madv == I915_MADV_WILLNEED && | |
394 | dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES) { | |
395 | if (args->tiling_mode == I915_TILING_NONE) | |
396 | i915_gem_object_unpin_pages(obj); | |
397 | if (obj->tiling_mode == I915_TILING_NONE) | |
398 | i915_gem_object_pin_pages(obj); | |
399 | } | |
400 | ||
5d82e3e6 | 401 | obj->fence_dirty = |
97b2a6a1 | 402 | obj->last_fenced_req || |
5d82e3e6 CW |
403 | obj->fence_reg != I915_FENCE_REG_NONE; |
404 | ||
467cffba CW |
405 | obj->tiling_mode = args->tiling_mode; |
406 | obj->stride = args->stride; | |
1869b620 CW |
407 | |
408 | /* Force the fence to be reacquired for GTT access */ | |
409 | i915_gem_release_mmap(obj); | |
467cffba | 410 | } |
0f973f27 | 411 | } |
467cffba CW |
412 | /* we have to maintain this existing ABI... */ |
413 | args->stride = obj->stride; | |
414 | args->tiling_mode = obj->tiling_mode; | |
e9b73c67 CW |
415 | |
416 | /* Try to preallocate memory required to save swizzling on put-pages */ | |
417 | if (i915_gem_object_needs_bit17_swizzle(obj)) { | |
418 | if (obj->bit_17 == NULL) { | |
a1e22653 | 419 | obj->bit_17 = kcalloc(BITS_TO_LONGS(obj->base.size >> PAGE_SHIFT), |
e9b73c67 CW |
420 | sizeof(long), GFP_KERNEL); |
421 | } | |
422 | } else { | |
423 | kfree(obj->bit_17); | |
424 | obj->bit_17 = NULL; | |
425 | } | |
426 | ||
6c31a614 | 427 | err: |
05394f39 | 428 | drm_gem_object_unreference(&obj->base); |
d6873102 | 429 | mutex_unlock(&dev->struct_mutex); |
673a394b | 430 | |
467cffba | 431 | return ret; |
673a394b EA |
432 | } |
433 | ||
434 | /** | |
435 | * Returns the current tiling mode and required bit 6 swizzling for the object. | |
436 | */ | |
437 | int | |
438 | i915_gem_get_tiling(struct drm_device *dev, void *data, | |
05394f39 | 439 | struct drm_file *file) |
673a394b EA |
440 | { |
441 | struct drm_i915_gem_get_tiling *args = data; | |
50227e1c | 442 | struct drm_i915_private *dev_priv = dev->dev_private; |
05394f39 | 443 | struct drm_i915_gem_object *obj; |
673a394b | 444 | |
05394f39 | 445 | obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle)); |
c8725226 | 446 | if (&obj->base == NULL) |
bf79cb91 | 447 | return -ENOENT; |
673a394b EA |
448 | |
449 | mutex_lock(&dev->struct_mutex); | |
450 | ||
05394f39 CW |
451 | args->tiling_mode = obj->tiling_mode; |
452 | switch (obj->tiling_mode) { | |
673a394b EA |
453 | case I915_TILING_X: |
454 | args->swizzle_mode = dev_priv->mm.bit_6_swizzle_x; | |
455 | break; | |
456 | case I915_TILING_Y: | |
457 | args->swizzle_mode = dev_priv->mm.bit_6_swizzle_y; | |
458 | break; | |
459 | case I915_TILING_NONE: | |
460 | args->swizzle_mode = I915_BIT_6_SWIZZLE_NONE; | |
461 | break; | |
462 | default: | |
463 | DRM_ERROR("unknown tiling mode\n"); | |
464 | } | |
465 | ||
280b713b | 466 | /* Hide bit 17 from the user -- see comment in i915_gem_set_tiling */ |
70f2f5c7 | 467 | args->phys_swizzle_mode = args->swizzle_mode; |
280b713b EA |
468 | if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_17) |
469 | args->swizzle_mode = I915_BIT_6_SWIZZLE_9; | |
470 | if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_10_17) | |
471 | args->swizzle_mode = I915_BIT_6_SWIZZLE_9_10; | |
472 | ||
05394f39 | 473 | drm_gem_object_unreference(&obj->base); |
d6873102 | 474 | mutex_unlock(&dev->struct_mutex); |
673a394b EA |
475 | |
476 | return 0; | |
477 | } | |
280b713b EA |
478 | |
479 | /** | |
480 | * Swap every 64 bytes of this page around, to account for it having a new | |
481 | * bit 17 of its physical address and therefore being interpreted differently | |
482 | * by the GPU. | |
483 | */ | |
dd2575ff | 484 | static void |
280b713b EA |
485 | i915_gem_swizzle_page(struct page *page) |
486 | { | |
dd2575ff | 487 | char temp[64]; |
280b713b EA |
488 | char *vaddr; |
489 | int i; | |
280b713b EA |
490 | |
491 | vaddr = kmap(page); | |
280b713b EA |
492 | |
493 | for (i = 0; i < PAGE_SIZE; i += 128) { | |
494 | memcpy(temp, &vaddr[i], 64); | |
495 | memcpy(&vaddr[i], &vaddr[i + 64], 64); | |
496 | memcpy(&vaddr[i + 64], temp, 64); | |
497 | } | |
498 | ||
499 | kunmap(page); | |
280b713b EA |
500 | } |
501 | ||
502 | void | |
05394f39 | 503 | i915_gem_object_do_bit_17_swizzle(struct drm_i915_gem_object *obj) |
280b713b | 504 | { |
67d5a50c | 505 | struct sg_page_iter sg_iter; |
280b713b EA |
506 | int i; |
507 | ||
05394f39 | 508 | if (obj->bit_17 == NULL) |
280b713b EA |
509 | return; |
510 | ||
67d5a50c ID |
511 | i = 0; |
512 | for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0) { | |
2db76d7c | 513 | struct page *page = sg_page_iter_page(&sg_iter); |
9da3da66 | 514 | char new_bit_17 = page_to_phys(page) >> 17; |
280b713b | 515 | if ((new_bit_17 & 0x1) != |
05394f39 | 516 | (test_bit(i, obj->bit_17) != 0)) { |
9da3da66 CW |
517 | i915_gem_swizzle_page(page); |
518 | set_page_dirty(page); | |
280b713b | 519 | } |
67d5a50c | 520 | i++; |
280b713b EA |
521 | } |
522 | } | |
523 | ||
524 | void | |
05394f39 | 525 | i915_gem_object_save_bit_17_swizzle(struct drm_i915_gem_object *obj) |
280b713b | 526 | { |
67d5a50c | 527 | struct sg_page_iter sg_iter; |
05394f39 | 528 | int page_count = obj->base.size >> PAGE_SHIFT; |
280b713b EA |
529 | int i; |
530 | ||
05394f39 | 531 | if (obj->bit_17 == NULL) { |
a1e22653 DV |
532 | obj->bit_17 = kcalloc(BITS_TO_LONGS(page_count), |
533 | sizeof(long), GFP_KERNEL); | |
05394f39 | 534 | if (obj->bit_17 == NULL) { |
280b713b EA |
535 | DRM_ERROR("Failed to allocate memory for bit 17 " |
536 | "record\n"); | |
537 | return; | |
538 | } | |
539 | } | |
540 | ||
67d5a50c ID |
541 | i = 0; |
542 | for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0) { | |
2db76d7c | 543 | if (page_to_phys(sg_page_iter_page(&sg_iter)) & (1 << 17)) |
05394f39 | 544 | __set_bit(i, obj->bit_17); |
280b713b | 545 | else |
05394f39 | 546 | __clear_bit(i, obj->bit_17); |
67d5a50c | 547 | i++; |
280b713b EA |
548 | } |
549 | } |