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9797fbfb CW |
1 | /* |
2 | * Copyright © 2008-2012 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 | * Chris Wilson <chris@chris-wilson.co.uk> | |
26 | * | |
27 | */ | |
28 | ||
760285e7 DH |
29 | #include <drm/drmP.h> |
30 | #include <drm/i915_drm.h> | |
9797fbfb CW |
31 | #include "i915_drv.h" |
32 | ||
0ad98c74 VS |
33 | #define KB(x) ((x) * 1024) |
34 | #define MB(x) (KB(x) * 1024) | |
35 | ||
9797fbfb CW |
36 | /* |
37 | * The BIOS typically reserves some of the system's memory for the exclusive | |
38 | * use of the integrated graphics. This memory is no longer available for | |
39 | * use by the OS and so the user finds that his system has less memory | |
40 | * available than he put in. We refer to this memory as stolen. | |
41 | * | |
42 | * The BIOS will allocate its framebuffer from the stolen memory. Our | |
43 | * goal is try to reuse that object for our own fbcon which must always | |
44 | * be available for panics. Anything else we can reuse the stolen memory | |
45 | * for is a boon. | |
46 | */ | |
47 | ||
a9da512b PZ |
48 | int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *dev_priv, |
49 | struct drm_mm_node *node, u64 size, | |
50 | unsigned alignment, u64 start, u64 end) | |
d713fd49 | 51 | { |
92e97d2f PZ |
52 | int ret; |
53 | ||
d713fd49 PZ |
54 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
55 | return -ENODEV; | |
56 | ||
1ca36d4c PZ |
57 | /* See the comment at the drm_mm_init() call for more about this check. |
58 | * WaSkipStolenMemoryFirstPage:bdw,chv (incomplete) */ | |
59 | if (INTEL_INFO(dev_priv)->gen == 8 && start < 4096) | |
60 | start = 4096; | |
61 | ||
92e97d2f | 62 | mutex_lock(&dev_priv->mm.stolen_lock); |
a9da512b PZ |
63 | ret = drm_mm_insert_node_in_range(&dev_priv->mm.stolen, node, size, |
64 | alignment, start, end, | |
65 | DRM_MM_SEARCH_DEFAULT); | |
92e97d2f PZ |
66 | mutex_unlock(&dev_priv->mm.stolen_lock); |
67 | ||
68 | return ret; | |
d713fd49 PZ |
69 | } |
70 | ||
a9da512b PZ |
71 | int i915_gem_stolen_insert_node(struct drm_i915_private *dev_priv, |
72 | struct drm_mm_node *node, u64 size, | |
73 | unsigned alignment) | |
74 | { | |
72e96d64 JL |
75 | struct i915_ggtt *ggtt = &dev_priv->ggtt; |
76 | ||
a9da512b | 77 | return i915_gem_stolen_insert_node_in_range(dev_priv, node, size, |
72e96d64 JL |
78 | alignment, 0, |
79 | ggtt->stolen_usable_size); | |
a9da512b PZ |
80 | } |
81 | ||
d713fd49 PZ |
82 | void i915_gem_stolen_remove_node(struct drm_i915_private *dev_priv, |
83 | struct drm_mm_node *node) | |
84 | { | |
92e97d2f | 85 | mutex_lock(&dev_priv->mm.stolen_lock); |
d713fd49 | 86 | drm_mm_remove_node(node); |
92e97d2f | 87 | mutex_unlock(&dev_priv->mm.stolen_lock); |
d713fd49 PZ |
88 | } |
89 | ||
e12a2d53 | 90 | static unsigned long i915_stolen_to_physical(struct drm_device *dev) |
9797fbfb | 91 | { |
72e96d64 JL |
92 | struct drm_i915_private *dev_priv = to_i915(dev); |
93 | struct i915_ggtt *ggtt = &dev_priv->ggtt; | |
eaba1b8f | 94 | struct resource *r; |
9797fbfb CW |
95 | u32 base; |
96 | ||
17fec8a0 | 97 | /* Almost universally we can find the Graphics Base of Stolen Memory |
e10fa551 JL |
98 | * at register BSM (0x5c) in the igfx configuration space. On a few |
99 | * (desktop) machines this is also mirrored in the bridge device at | |
100 | * different locations, or in the MCHBAR. | |
0ad98c74 VS |
101 | * |
102 | * On 865 we just check the TOUD register. | |
103 | * | |
104 | * On 830/845/85x the stolen memory base isn't available in any | |
105 | * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size. | |
e12a2d53 | 106 | * |
9797fbfb | 107 | */ |
e12a2d53 | 108 | base = 0; |
17fec8a0 | 109 | if (INTEL_INFO(dev)->gen >= 3) { |
e10fa551 JL |
110 | u32 bsm; |
111 | ||
112 | pci_read_config_dword(dev->pdev, BSM, &bsm); | |
113 | ||
114 | base = bsm & BSM_MASK; | |
0ad98c74 VS |
115 | } else if (IS_I865G(dev)) { |
116 | u16 toud = 0; | |
117 | ||
118 | /* | |
119 | * FIXME is the graphics stolen memory region | |
120 | * always at TOUD? Ie. is it always the last | |
121 | * one to be allocated by the BIOS? | |
122 | */ | |
123 | pci_bus_read_config_word(dev->pdev->bus, PCI_DEVFN(0, 0), | |
124 | I865_TOUD, &toud); | |
125 | ||
126 | base = toud << 16; | |
127 | } else if (IS_I85X(dev)) { | |
128 | u32 tseg_size = 0; | |
129 | u32 tom; | |
130 | u8 tmp; | |
131 | ||
132 | pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), | |
133 | I85X_ESMRAMC, &tmp); | |
134 | ||
135 | if (tmp & TSEG_ENABLE) | |
136 | tseg_size = MB(1); | |
137 | ||
138 | pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 1), | |
139 | I85X_DRB3, &tmp); | |
140 | tom = tmp * MB(32); | |
141 | ||
72e96d64 | 142 | base = tom - tseg_size - ggtt->stolen_size; |
0ad98c74 VS |
143 | } else if (IS_845G(dev)) { |
144 | u32 tseg_size = 0; | |
145 | u32 tom; | |
146 | u8 tmp; | |
147 | ||
148 | pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), | |
149 | I845_ESMRAMC, &tmp); | |
150 | ||
151 | if (tmp & TSEG_ENABLE) { | |
152 | switch (tmp & I845_TSEG_SIZE_MASK) { | |
153 | case I845_TSEG_SIZE_512K: | |
154 | tseg_size = KB(512); | |
155 | break; | |
156 | case I845_TSEG_SIZE_1M: | |
157 | tseg_size = MB(1); | |
158 | break; | |
159 | } | |
160 | } | |
161 | ||
162 | pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), | |
163 | I830_DRB3, &tmp); | |
164 | tom = tmp * MB(32); | |
165 | ||
72e96d64 | 166 | base = tom - tseg_size - ggtt->stolen_size; |
0ad98c74 VS |
167 | } else if (IS_I830(dev)) { |
168 | u32 tseg_size = 0; | |
169 | u32 tom; | |
170 | u8 tmp; | |
171 | ||
172 | pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), | |
173 | I830_ESMRAMC, &tmp); | |
174 | ||
175 | if (tmp & TSEG_ENABLE) { | |
176 | if (tmp & I830_TSEG_SIZE_1M) | |
177 | tseg_size = MB(1); | |
178 | else | |
179 | tseg_size = KB(512); | |
180 | } | |
181 | ||
182 | pci_bus_read_config_byte(dev->pdev->bus, PCI_DEVFN(0, 0), | |
183 | I830_DRB3, &tmp); | |
184 | tom = tmp * MB(32); | |
185 | ||
72e96d64 | 186 | base = tom - tseg_size - ggtt->stolen_size; |
e12a2d53 | 187 | } |
9797fbfb | 188 | |
eaba1b8f CW |
189 | if (base == 0) |
190 | return 0; | |
191 | ||
f1e1c212 VS |
192 | /* make sure we don't clobber the GTT if it's within stolen memory */ |
193 | if (INTEL_INFO(dev)->gen <= 4 && !IS_G33(dev) && !IS_G4X(dev)) { | |
194 | struct { | |
195 | u32 start, end; | |
196 | } stolen[2] = { | |
72e96d64 JL |
197 | { .start = base, .end = base + ggtt->stolen_size, }, |
198 | { .start = base, .end = base + ggtt->stolen_size, }, | |
f1e1c212 | 199 | }; |
72e96d64 | 200 | u64 ggtt_start, ggtt_end; |
f1e1c212 | 201 | |
72e96d64 | 202 | ggtt_start = I915_READ(PGTBL_CTL); |
f1e1c212 | 203 | if (IS_GEN4(dev)) |
72e96d64 JL |
204 | ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) | |
205 | (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28; | |
f1e1c212 | 206 | else |
72e96d64 JL |
207 | ggtt_start &= PGTBL_ADDRESS_LO_MASK; |
208 | ggtt_end = ggtt_start + ggtt_total_entries(ggtt) * 4; | |
f1e1c212 | 209 | |
72e96d64 JL |
210 | if (ggtt_start >= stolen[0].start && ggtt_start < stolen[0].end) |
211 | stolen[0].end = ggtt_start; | |
212 | if (ggtt_end > stolen[1].start && ggtt_end <= stolen[1].end) | |
213 | stolen[1].start = ggtt_end; | |
f1e1c212 VS |
214 | |
215 | /* pick the larger of the two chunks */ | |
216 | if (stolen[0].end - stolen[0].start > | |
217 | stolen[1].end - stolen[1].start) { | |
218 | base = stolen[0].start; | |
72e96d64 | 219 | ggtt->stolen_size = stolen[0].end - stolen[0].start; |
f1e1c212 VS |
220 | } else { |
221 | base = stolen[1].start; | |
72e96d64 | 222 | ggtt->stolen_size = stolen[1].end - stolen[1].start; |
f1e1c212 VS |
223 | } |
224 | ||
225 | if (stolen[0].start != stolen[1].start || | |
226 | stolen[0].end != stolen[1].end) { | |
227 | DRM_DEBUG_KMS("GTT within stolen memory at 0x%llx-0x%llx\n", | |
72e96d64 JL |
228 | (unsigned long long)ggtt_start, |
229 | (unsigned long long)ggtt_end - 1); | |
f1e1c212 | 230 | DRM_DEBUG_KMS("Stolen memory adjusted to 0x%x-0x%x\n", |
72e96d64 | 231 | base, base + (u32)ggtt->stolen_size - 1); |
f1e1c212 VS |
232 | } |
233 | } | |
234 | ||
235 | ||
eaba1b8f CW |
236 | /* Verify that nothing else uses this physical address. Stolen |
237 | * memory should be reserved by the BIOS and hidden from the | |
238 | * kernel. So if the region is already marked as busy, something | |
239 | * is seriously wrong. | |
240 | */ | |
72e96d64 | 241 | r = devm_request_mem_region(dev->dev, base, ggtt->stolen_size, |
eaba1b8f CW |
242 | "Graphics Stolen Memory"); |
243 | if (r == NULL) { | |
3617dc96 AG |
244 | /* |
245 | * One more attempt but this time requesting region from | |
246 | * base + 1, as we have seen that this resolves the region | |
247 | * conflict with the PCI Bus. | |
248 | * This is a BIOS w/a: Some BIOS wrap stolen in the root | |
249 | * PCI bus, but have an off-by-one error. Hence retry the | |
250 | * reservation starting from 1 instead of 0. | |
251 | */ | |
252 | r = devm_request_mem_region(dev->dev, base + 1, | |
72e96d64 | 253 | ggtt->stolen_size - 1, |
3617dc96 | 254 | "Graphics Stolen Memory"); |
0b6d24c0 DV |
255 | /* |
256 | * GEN3 firmware likes to smash pci bridges into the stolen | |
257 | * range. Apparently this works. | |
258 | */ | |
259 | if (r == NULL && !IS_GEN3(dev)) { | |
3617dc96 | 260 | DRM_ERROR("conflict detected with stolen region: [0x%08x - 0x%08x]\n", |
72e96d64 | 261 | base, base + (uint32_t)ggtt->stolen_size); |
3617dc96 AG |
262 | base = 0; |
263 | } | |
eaba1b8f CW |
264 | } |
265 | ||
e12a2d53 | 266 | return base; |
9797fbfb CW |
267 | } |
268 | ||
9797fbfb CW |
269 | void i915_gem_cleanup_stolen(struct drm_device *dev) |
270 | { | |
4d7bb011 DV |
271 | struct drm_i915_private *dev_priv = dev->dev_private; |
272 | ||
446f8d81 DV |
273 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
274 | return; | |
275 | ||
4d7bb011 | 276 | drm_mm_takedown(&dev_priv->mm.stolen); |
9797fbfb CW |
277 | } |
278 | ||
7d316aec VS |
279 | static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv, |
280 | unsigned long *base, unsigned long *size) | |
281 | { | |
72e96d64 | 282 | struct i915_ggtt *ggtt = &dev_priv->ggtt; |
7d316aec VS |
283 | uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ? |
284 | CTG_STOLEN_RESERVED : | |
285 | ELK_STOLEN_RESERVED); | |
286 | unsigned long stolen_top = dev_priv->mm.stolen_base + | |
72e96d64 | 287 | ggtt->stolen_size; |
7d316aec VS |
288 | |
289 | *base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16; | |
290 | ||
291 | WARN_ON((reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base); | |
292 | ||
293 | /* On these platforms, the register doesn't have a size field, so the | |
294 | * size is the distance between the base and the top of the stolen | |
295 | * memory. We also have the genuine case where base is zero and there's | |
296 | * nothing reserved. */ | |
297 | if (*base == 0) | |
298 | *size = 0; | |
299 | else | |
300 | *size = stolen_top - *base; | |
301 | } | |
302 | ||
3774eb50 PZ |
303 | static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv, |
304 | unsigned long *base, unsigned long *size) | |
305 | { | |
306 | uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); | |
307 | ||
308 | *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; | |
309 | ||
310 | switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) { | |
311 | case GEN6_STOLEN_RESERVED_1M: | |
312 | *size = 1024 * 1024; | |
313 | break; | |
314 | case GEN6_STOLEN_RESERVED_512K: | |
315 | *size = 512 * 1024; | |
316 | break; | |
317 | case GEN6_STOLEN_RESERVED_256K: | |
318 | *size = 256 * 1024; | |
319 | break; | |
320 | case GEN6_STOLEN_RESERVED_128K: | |
321 | *size = 128 * 1024; | |
322 | break; | |
323 | default: | |
324 | *size = 1024 * 1024; | |
325 | MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK); | |
326 | } | |
327 | } | |
328 | ||
329 | static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv, | |
330 | unsigned long *base, unsigned long *size) | |
331 | { | |
332 | uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); | |
333 | ||
334 | *base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK; | |
335 | ||
336 | switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) { | |
337 | case GEN7_STOLEN_RESERVED_1M: | |
338 | *size = 1024 * 1024; | |
339 | break; | |
340 | case GEN7_STOLEN_RESERVED_256K: | |
341 | *size = 256 * 1024; | |
342 | break; | |
343 | default: | |
344 | *size = 1024 * 1024; | |
345 | MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK); | |
346 | } | |
347 | } | |
348 | ||
349 | static void gen8_get_stolen_reserved(struct drm_i915_private *dev_priv, | |
350 | unsigned long *base, unsigned long *size) | |
351 | { | |
352 | uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); | |
353 | ||
354 | *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; | |
355 | ||
356 | switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) { | |
357 | case GEN8_STOLEN_RESERVED_1M: | |
358 | *size = 1024 * 1024; | |
359 | break; | |
360 | case GEN8_STOLEN_RESERVED_2M: | |
361 | *size = 2 * 1024 * 1024; | |
362 | break; | |
363 | case GEN8_STOLEN_RESERVED_4M: | |
364 | *size = 4 * 1024 * 1024; | |
365 | break; | |
366 | case GEN8_STOLEN_RESERVED_8M: | |
367 | *size = 8 * 1024 * 1024; | |
368 | break; | |
369 | default: | |
370 | *size = 8 * 1024 * 1024; | |
371 | MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK); | |
372 | } | |
373 | } | |
374 | ||
375 | static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv, | |
376 | unsigned long *base, unsigned long *size) | |
377 | { | |
72e96d64 | 378 | struct i915_ggtt *ggtt = &dev_priv->ggtt; |
3774eb50 PZ |
379 | uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED); |
380 | unsigned long stolen_top; | |
381 | ||
72e96d64 | 382 | stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size; |
3774eb50 PZ |
383 | |
384 | *base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK; | |
385 | ||
386 | /* On these platforms, the register doesn't have a size field, so the | |
387 | * size is the distance between the base and the top of the stolen | |
388 | * memory. We also have the genuine case where base is zero and there's | |
389 | * nothing reserved. */ | |
390 | if (*base == 0) | |
391 | *size = 0; | |
392 | else | |
393 | *size = stolen_top - *base; | |
394 | } | |
395 | ||
9797fbfb CW |
396 | int i915_gem_init_stolen(struct drm_device *dev) |
397 | { | |
72e96d64 JL |
398 | struct drm_i915_private *dev_priv = to_i915(dev); |
399 | struct i915_ggtt *ggtt = &dev_priv->ggtt; | |
d7884d69 | 400 | unsigned long reserved_total, reserved_base = 0, reserved_size; |
3774eb50 | 401 | unsigned long stolen_top; |
9797fbfb | 402 | |
92e97d2f PZ |
403 | mutex_init(&dev_priv->mm.stolen_lock); |
404 | ||
0f4706d2 | 405 | #ifdef CONFIG_INTEL_IOMMU |
fcc9fe1a | 406 | if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) { |
0f4706d2 CW |
407 | DRM_INFO("DMAR active, disabling use of stolen memory\n"); |
408 | return 0; | |
409 | } | |
410 | #endif | |
411 | ||
72e96d64 | 412 | if (ggtt->stolen_size == 0) |
6644a4e9 CW |
413 | return 0; |
414 | ||
e12a2d53 CW |
415 | dev_priv->mm.stolen_base = i915_stolen_to_physical(dev); |
416 | if (dev_priv->mm.stolen_base == 0) | |
417 | return 0; | |
418 | ||
72e96d64 | 419 | stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size; |
3774eb50 PZ |
420 | |
421 | switch (INTEL_INFO(dev_priv)->gen) { | |
422 | case 2: | |
423 | case 3: | |
7d316aec | 424 | break; |
3774eb50 | 425 | case 4: |
7d316aec VS |
426 | if (IS_G4X(dev)) |
427 | g4x_get_stolen_reserved(dev_priv, &reserved_base, | |
428 | &reserved_size); | |
429 | break; | |
3774eb50 PZ |
430 | case 5: |
431 | /* Assume the gen6 maximum for the older platforms. */ | |
432 | reserved_size = 1024 * 1024; | |
433 | reserved_base = stolen_top - reserved_size; | |
434 | break; | |
435 | case 6: | |
436 | gen6_get_stolen_reserved(dev_priv, &reserved_base, | |
437 | &reserved_size); | |
438 | break; | |
439 | case 7: | |
440 | gen7_get_stolen_reserved(dev_priv, &reserved_base, | |
441 | &reserved_size); | |
442 | break; | |
443 | default: | |
ef11bdb3 RV |
444 | if (IS_BROADWELL(dev_priv) || |
445 | IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev)) | |
3774eb50 PZ |
446 | bdw_get_stolen_reserved(dev_priv, &reserved_base, |
447 | &reserved_size); | |
448 | else | |
449 | gen8_get_stolen_reserved(dev_priv, &reserved_base, | |
450 | &reserved_size); | |
451 | break; | |
452 | } | |
453 | ||
454 | /* It is possible for the reserved base to be zero, but the register | |
455 | * field for size doesn't have a zero option. */ | |
456 | if (reserved_base == 0) { | |
457 | reserved_size = 0; | |
458 | reserved_base = stolen_top; | |
40bae736 | 459 | } |
c9cddffc | 460 | |
3774eb50 PZ |
461 | if (reserved_base < dev_priv->mm.stolen_base || |
462 | reserved_base + reserved_size > stolen_top) { | |
463 | DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n", | |
464 | reserved_base, reserved_base + reserved_size, | |
465 | dev_priv->mm.stolen_base, stolen_top); | |
897f9ed0 | 466 | return 0; |
3774eb50 PZ |
467 | } |
468 | ||
72e96d64 JL |
469 | ggtt->stolen_reserved_base = reserved_base; |
470 | ggtt->stolen_reserved_size = reserved_size; | |
274008e8 | 471 | |
3774eb50 PZ |
472 | /* It is possible for the reserved area to end before the end of stolen |
473 | * memory, so just consider the start. */ | |
474 | reserved_total = stolen_top - reserved_base; | |
475 | ||
8e9d597a | 476 | DRM_DEBUG_KMS("Memory reserved for graphics device: %zuK, usable: %luK\n", |
72e96d64 JL |
477 | ggtt->stolen_size >> 10, |
478 | (ggtt->stolen_size - reserved_total) >> 10); | |
897f9ed0 | 479 | |
72e96d64 | 480 | ggtt->stolen_usable_size = ggtt->stolen_size - reserved_total; |
a9da512b | 481 | |
1ca36d4c PZ |
482 | /* |
483 | * Basic memrange allocator for stolen space. | |
484 | * | |
485 | * TODO: Notice that some platforms require us to not use the first page | |
486 | * of the stolen memory but their BIOSes may still put the framebuffer | |
487 | * on the first page. So we don't reserve this page for now because of | |
488 | * that. Our current solution is to just prevent new nodes from being | |
489 | * inserted on the first page - see the check we have at | |
490 | * i915_gem_stolen_insert_node_in_range(). We may want to fix the fbcon | |
491 | * problem later. | |
492 | */ | |
72e96d64 | 493 | drm_mm_init(&dev_priv->mm.stolen, 0, ggtt->stolen_usable_size); |
9797fbfb CW |
494 | |
495 | return 0; | |
496 | } | |
0104fdbb CW |
497 | |
498 | static struct sg_table * | |
499 | i915_pages_create_for_stolen(struct drm_device *dev, | |
500 | u32 offset, u32 size) | |
501 | { | |
72e96d64 JL |
502 | struct drm_i915_private *dev_priv = to_i915(dev); |
503 | struct i915_ggtt *ggtt = &dev_priv->ggtt; | |
0104fdbb CW |
504 | struct sg_table *st; |
505 | struct scatterlist *sg; | |
506 | ||
507 | DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size); | |
72e96d64 | 508 | BUG_ON(offset > ggtt->stolen_size - size); |
0104fdbb CW |
509 | |
510 | /* We hide that we have no struct page backing our stolen object | |
511 | * by wrapping the contiguous physical allocation with a fake | |
512 | * dma mapping in a single scatterlist. | |
513 | */ | |
514 | ||
515 | st = kmalloc(sizeof(*st), GFP_KERNEL); | |
516 | if (st == NULL) | |
517 | return NULL; | |
518 | ||
519 | if (sg_alloc_table(st, 1, GFP_KERNEL)) { | |
520 | kfree(st); | |
521 | return NULL; | |
522 | } | |
523 | ||
524 | sg = st->sgl; | |
ec14ba47 | 525 | sg->offset = 0; |
ed23abdd | 526 | sg->length = size; |
0104fdbb CW |
527 | |
528 | sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset; | |
529 | sg_dma_len(sg) = size; | |
530 | ||
531 | return st; | |
532 | } | |
533 | ||
534 | static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj) | |
535 | { | |
536 | BUG(); | |
537 | return -EINVAL; | |
538 | } | |
539 | ||
540 | static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj) | |
541 | { | |
542 | /* Should only be called during free */ | |
543 | sg_free_table(obj->pages); | |
544 | kfree(obj->pages); | |
545 | } | |
546 | ||
ef0cf27c CW |
547 | |
548 | static void | |
549 | i915_gem_object_release_stolen(struct drm_i915_gem_object *obj) | |
550 | { | |
d713fd49 PZ |
551 | struct drm_i915_private *dev_priv = obj->base.dev->dev_private; |
552 | ||
ef0cf27c | 553 | if (obj->stolen) { |
d713fd49 | 554 | i915_gem_stolen_remove_node(dev_priv, obj->stolen); |
ef0cf27c CW |
555 | kfree(obj->stolen); |
556 | obj->stolen = NULL; | |
557 | } | |
558 | } | |
0104fdbb CW |
559 | static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = { |
560 | .get_pages = i915_gem_object_get_pages_stolen, | |
561 | .put_pages = i915_gem_object_put_pages_stolen, | |
ef0cf27c | 562 | .release = i915_gem_object_release_stolen, |
0104fdbb CW |
563 | }; |
564 | ||
565 | static struct drm_i915_gem_object * | |
566 | _i915_gem_object_create_stolen(struct drm_device *dev, | |
567 | struct drm_mm_node *stolen) | |
568 | { | |
569 | struct drm_i915_gem_object *obj; | |
570 | ||
42dcedd4 | 571 | obj = i915_gem_object_alloc(dev); |
0104fdbb CW |
572 | if (obj == NULL) |
573 | return NULL; | |
574 | ||
89c8233f | 575 | drm_gem_private_object_init(dev, &obj->base, stolen->size); |
0104fdbb CW |
576 | i915_gem_object_init(obj, &i915_gem_object_stolen_ops); |
577 | ||
578 | obj->pages = i915_pages_create_for_stolen(dev, | |
579 | stolen->start, stolen->size); | |
580 | if (obj->pages == NULL) | |
581 | goto cleanup; | |
582 | ||
c5236470 AS |
583 | obj->get_page.sg = obj->pages->sgl; |
584 | obj->get_page.last = 0; | |
585 | ||
dd53e1b0 | 586 | i915_gem_object_pin_pages(obj); |
0104fdbb CW |
587 | obj->stolen = stolen; |
588 | ||
d46f1c3f CW |
589 | obj->base.read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT; |
590 | obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE; | |
0104fdbb CW |
591 | |
592 | return obj; | |
593 | ||
594 | cleanup: | |
42dcedd4 | 595 | i915_gem_object_free(obj); |
0104fdbb CW |
596 | return NULL; |
597 | } | |
598 | ||
599 | struct drm_i915_gem_object * | |
600 | i915_gem_object_create_stolen(struct drm_device *dev, u32 size) | |
601 | { | |
602 | struct drm_i915_private *dev_priv = dev->dev_private; | |
603 | struct drm_i915_gem_object *obj; | |
604 | struct drm_mm_node *stolen; | |
06e78edf | 605 | int ret; |
0104fdbb | 606 | |
446f8d81 | 607 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
0104fdbb CW |
608 | return NULL; |
609 | ||
610 | DRM_DEBUG_KMS("creating stolen object: size=%x\n", size); | |
611 | if (size == 0) | |
612 | return NULL; | |
613 | ||
06e78edf DH |
614 | stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); |
615 | if (!stolen) | |
0104fdbb CW |
616 | return NULL; |
617 | ||
d713fd49 | 618 | ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096); |
06e78edf DH |
619 | if (ret) { |
620 | kfree(stolen); | |
621 | return NULL; | |
622 | } | |
623 | ||
0104fdbb CW |
624 | obj = _i915_gem_object_create_stolen(dev, stolen); |
625 | if (obj) | |
626 | return obj; | |
627 | ||
d713fd49 | 628 | i915_gem_stolen_remove_node(dev_priv, stolen); |
06e78edf | 629 | kfree(stolen); |
0104fdbb CW |
630 | return NULL; |
631 | } | |
632 | ||
866d12b4 CW |
633 | struct drm_i915_gem_object * |
634 | i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev, | |
635 | u32 stolen_offset, | |
636 | u32 gtt_offset, | |
637 | u32 size) | |
638 | { | |
72e96d64 JL |
639 | struct drm_i915_private *dev_priv = to_i915(dev); |
640 | struct i915_ggtt *ggtt = &dev_priv->ggtt; | |
866d12b4 CW |
641 | struct drm_i915_gem_object *obj; |
642 | struct drm_mm_node *stolen; | |
2f633156 | 643 | struct i915_vma *vma; |
b3a070cc | 644 | int ret; |
866d12b4 | 645 | |
446f8d81 | 646 | if (!drm_mm_initialized(&dev_priv->mm.stolen)) |
866d12b4 CW |
647 | return NULL; |
648 | ||
12c83d99 TU |
649 | lockdep_assert_held(&dev->struct_mutex); |
650 | ||
866d12b4 CW |
651 | DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n", |
652 | stolen_offset, gtt_offset, size); | |
653 | ||
654 | /* KISS and expect everything to be page-aligned */ | |
f37b5c2b DV |
655 | if (WARN_ON(size == 0) || WARN_ON(size & 4095) || |
656 | WARN_ON(stolen_offset & 4095)) | |
866d12b4 CW |
657 | return NULL; |
658 | ||
b3a070cc BW |
659 | stolen = kzalloc(sizeof(*stolen), GFP_KERNEL); |
660 | if (!stolen) | |
661 | return NULL; | |
662 | ||
338710e7 BW |
663 | stolen->start = stolen_offset; |
664 | stolen->size = size; | |
92e97d2f | 665 | mutex_lock(&dev_priv->mm.stolen_lock); |
338710e7 | 666 | ret = drm_mm_reserve_node(&dev_priv->mm.stolen, stolen); |
92e97d2f | 667 | mutex_unlock(&dev_priv->mm.stolen_lock); |
b3a070cc | 668 | if (ret) { |
866d12b4 | 669 | DRM_DEBUG_KMS("failed to allocate stolen space\n"); |
b3a070cc | 670 | kfree(stolen); |
866d12b4 CW |
671 | return NULL; |
672 | } | |
673 | ||
674 | obj = _i915_gem_object_create_stolen(dev, stolen); | |
675 | if (obj == NULL) { | |
676 | DRM_DEBUG_KMS("failed to allocate stolen object\n"); | |
d713fd49 | 677 | i915_gem_stolen_remove_node(dev_priv, stolen); |
06e78edf | 678 | kfree(stolen); |
866d12b4 CW |
679 | return NULL; |
680 | } | |
681 | ||
3727d55e | 682 | /* Some objects just need physical mem from stolen space */ |
190d6cd5 | 683 | if (gtt_offset == I915_GTT_OFFSET_NONE) |
3727d55e JB |
684 | return obj; |
685 | ||
72e96d64 | 686 | vma = i915_gem_obj_lookup_or_create_vma(obj, &ggtt->base); |
db473b36 DC |
687 | if (IS_ERR(vma)) { |
688 | ret = PTR_ERR(vma); | |
7c4a7d60 | 689 | goto err; |
2f633156 BW |
690 | } |
691 | ||
866d12b4 CW |
692 | /* To simplify the initialisation sequence between KMS and GTT, |
693 | * we allow construction of the stolen object prior to | |
694 | * setting up the GTT space. The actual reservation will occur | |
695 | * later. | |
696 | */ | |
2f633156 BW |
697 | vma->node.start = gtt_offset; |
698 | vma->node.size = size; | |
72e96d64 JL |
699 | if (drm_mm_initialized(&ggtt->base.mm)) { |
700 | ret = drm_mm_reserve_node(&ggtt->base.mm, &vma->node); | |
b3a070cc | 701 | if (ret) { |
866d12b4 | 702 | DRM_DEBUG_KMS("failed to allocate stolen GTT space\n"); |
7c4a7d60 | 703 | goto err; |
866d12b4 | 704 | } |
866d12b4 | 705 | |
7c4a7d60 | 706 | vma->bound |= GLOBAL_BIND; |
d0710abb | 707 | __i915_vma_set_map_and_fenceable(vma); |
72e96d64 | 708 | list_add_tail(&vma->vm_link, &ggtt->base.inactive_list); |
7c4a7d60 | 709 | } |
866d12b4 | 710 | |
35c20a60 | 711 | list_add_tail(&obj->global_list, &dev_priv->mm.bound_list); |
d8ccba86 | 712 | i915_gem_object_pin_pages(obj); |
866d12b4 CW |
713 | |
714 | return obj; | |
b3a070cc | 715 | |
7c4a7d60 | 716 | err: |
b3a070cc BW |
717 | drm_gem_object_unreference(&obj->base); |
718 | return NULL; | |
866d12b4 | 719 | } |