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Chris Wilson9797fbf2012-04-24 15:47:39 +01001/*
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
David Howells760285e2012-10-02 18:01:07 +010029#include <drm/drmP.h>
30#include <drm/i915_drm.h>
Chris Wilson9797fbf2012-04-24 15:47:39 +010031#include "i915_drv.h"
32
33/*
34 * The BIOS typically reserves some of the system's memory for the exclusive
35 * use of the integrated graphics. This memory is no longer available for
36 * use by the OS and so the user finds that his system has less memory
37 * available than he put in. We refer to this memory as stolen.
38 *
39 * The BIOS will allocate its framebuffer from the stolen memory. Our
40 * goal is try to reuse that object for our own fbcon which must always
41 * be available for panics. Anything else we can reuse the stolen memory
42 * for is a boon.
43 */
44
Chris Wilsone12a2d52012-11-15 11:32:18 +000045static unsigned long i915_stolen_to_physical(struct drm_device *dev)
Chris Wilson9797fbf2012-04-24 15:47:39 +010046{
47 struct drm_i915_private *dev_priv = dev->dev_private;
48 struct pci_dev *pdev = dev_priv->bridge_dev;
49 u32 base;
50
Chris Wilson9797fbf2012-04-24 15:47:39 +010051 /* On the machines I have tested the Graphics Base of Stolen Memory
Chris Wilsone12a2d52012-11-15 11:32:18 +000052 * is unreliable, so on those compute the base by subtracting the
53 * stolen memory from the Top of Low Usable DRAM which is where the
54 * BIOS places the graphics stolen memory.
55 *
56 * On gen2, the layout is slightly different with the Graphics Segment
57 * immediately following Top of Memory (or Top of Usable DRAM). Note
58 * it appears that TOUD is only reported by 865g, so we just use the
59 * top of memory as determined by the e820 probe.
60 *
61 * XXX gen2 requires an unavailable symbol and 945gm fails with
62 * its value of TOLUD.
Chris Wilson9797fbf2012-04-24 15:47:39 +010063 */
Chris Wilsone12a2d52012-11-15 11:32:18 +000064 base = 0;
65 if (INTEL_INFO(dev)->gen >= 6) {
66 /* Read Base Data of Stolen Memory Register (BDSM) directly.
67 * Note that there is also a MCHBAR miror at 0x1080c0 or
68 * we could use device 2:0x5c instead.
69 */
70 pci_read_config_dword(pdev, 0xB0, &base);
71 base &= ~4095; /* lower bits used for locking register */
72 } else if (INTEL_INFO(dev)->gen > 3 || IS_G33(dev)) {
73 /* Read Graphics Base of Stolen Memory directly */
Chris Wilson9797fbf2012-04-24 15:47:39 +010074 pci_read_config_dword(pdev, 0xA4, &base);
Chris Wilsone12a2d52012-11-15 11:32:18 +000075#if 0
76 } else if (IS_GEN3(dev)) {
Chris Wilson9797fbf2012-04-24 15:47:39 +010077 u8 val;
Chris Wilsone12a2d52012-11-15 11:32:18 +000078 /* Stolen is immediately below Top of Low Usable DRAM */
Chris Wilson9797fbf2012-04-24 15:47:39 +010079 pci_read_config_byte(pdev, 0x9c, &val);
80 base = val >> 3 << 27;
Chris Wilsone12a2d52012-11-15 11:32:18 +000081 base -= dev_priv->mm.gtt->stolen_size;
82 } else {
83 /* Stolen is immediately above Top of Memory */
84 base = max_low_pfn_mapped << PAGE_SHIFT;
Chris Wilson9797fbf2012-04-24 15:47:39 +010085#endif
Chris Wilsone12a2d52012-11-15 11:32:18 +000086 }
Chris Wilson9797fbf2012-04-24 15:47:39 +010087
Chris Wilsone12a2d52012-11-15 11:32:18 +000088 return base;
Chris Wilson9797fbf2012-04-24 15:47:39 +010089}
90
Chris Wilson11be49e2012-11-15 11:32:20 +000091static int i915_setup_compression(struct drm_device *dev, int size)
Chris Wilson9797fbf2012-04-24 15:47:39 +010092{
93 struct drm_i915_private *dev_priv = dev->dev_private;
94 struct drm_mm_node *compressed_fb, *uninitialized_var(compressed_llb);
Chris Wilson9797fbf2012-04-24 15:47:39 +010095
Chris Wilson11be49e2012-11-15 11:32:20 +000096 /* Try to over-allocate to reduce reallocations and fragmentation */
97 compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen,
98 size <<= 1, 4096, 0);
99 if (!compressed_fb)
100 compressed_fb = drm_mm_search_free(&dev_priv->mm.stolen,
101 size >>= 1, 4096, 0);
Chris Wilson9797fbf2012-04-24 15:47:39 +0100102 if (compressed_fb)
103 compressed_fb = drm_mm_get_block(compressed_fb, size, 4096);
104 if (!compressed_fb)
105 goto err;
106
Chris Wilson11be49e2012-11-15 11:32:20 +0000107 if (HAS_PCH_SPLIT(dev))
108 I915_WRITE(ILK_DPFC_CB_BASE, compressed_fb->start);
109 else if (IS_GM45(dev)) {
110 I915_WRITE(DPFC_CB_BASE, compressed_fb->start);
111 } else {
Chris Wilson9797fbf2012-04-24 15:47:39 +0100112 compressed_llb = drm_mm_search_free(&dev_priv->mm.stolen,
113 4096, 4096, 0);
114 if (compressed_llb)
115 compressed_llb = drm_mm_get_block(compressed_llb,
116 4096, 4096);
117 if (!compressed_llb)
118 goto err_fb;
119
Chris Wilson11be49e2012-11-15 11:32:20 +0000120 dev_priv->compressed_llb = compressed_llb;
Chris Wilson9797fbf2012-04-24 15:47:39 +0100121
Chris Wilson11be49e2012-11-15 11:32:20 +0000122 I915_WRITE(FBC_CFB_BASE,
123 dev_priv->mm.stolen_base + compressed_fb->start);
124 I915_WRITE(FBC_LL_BASE,
125 dev_priv->mm.stolen_base + compressed_llb->start);
126 }
Chris Wilson9797fbf2012-04-24 15:47:39 +0100127
128 dev_priv->compressed_fb = compressed_fb;
Chris Wilson11be49e2012-11-15 11:32:20 +0000129 dev_priv->cfb_size = size;
Chris Wilson9797fbf2012-04-24 15:47:39 +0100130
Chris Wilson11be49e2012-11-15 11:32:20 +0000131 DRM_DEBUG_KMS("reserved %d bytes of contiguous stolen space for FBC\n",
132 size);
Chris Wilson9797fbf2012-04-24 15:47:39 +0100133
Chris Wilson11be49e2012-11-15 11:32:20 +0000134 return 0;
135
Chris Wilson9797fbf2012-04-24 15:47:39 +0100136err_fb:
137 drm_mm_put_block(compressed_fb);
138err:
Chris Wilson11be49e2012-11-15 11:32:20 +0000139 return -ENOSPC;
Chris Wilson9797fbf2012-04-24 15:47:39 +0100140}
141
Chris Wilson11be49e2012-11-15 11:32:20 +0000142int i915_gem_stolen_setup_compression(struct drm_device *dev, int size)
Chris Wilson9797fbf2012-04-24 15:47:39 +0100143{
144 struct drm_i915_private *dev_priv = dev->dev_private;
145
Chris Wilson11be49e2012-11-15 11:32:20 +0000146 if (dev_priv->mm.stolen_base == 0)
147 return -ENODEV;
148
149 if (size < dev_priv->cfb_size)
150 return 0;
151
152 /* Release any current block */
153 i915_gem_stolen_cleanup_compression(dev);
154
155 return i915_setup_compression(dev, size);
156}
157
158void i915_gem_stolen_cleanup_compression(struct drm_device *dev)
159{
160 struct drm_i915_private *dev_priv = dev->dev_private;
161
162 if (dev_priv->cfb_size == 0)
163 return;
164
165 if (dev_priv->compressed_fb)
166 drm_mm_put_block(dev_priv->compressed_fb);
167
Chris Wilson9797fbf2012-04-24 15:47:39 +0100168 if (dev_priv->compressed_llb)
169 drm_mm_put_block(dev_priv->compressed_llb);
Chris Wilson11be49e2012-11-15 11:32:20 +0000170
171 dev_priv->cfb_size = 0;
Chris Wilson9797fbf2012-04-24 15:47:39 +0100172}
173
174void i915_gem_cleanup_stolen(struct drm_device *dev)
175{
Daniel Vetter4d7bb012012-12-18 15:24:37 +0100176 struct drm_i915_private *dev_priv = dev->dev_private;
177
Chris Wilson11be49e2012-11-15 11:32:20 +0000178 i915_gem_stolen_cleanup_compression(dev);
Daniel Vetter4d7bb012012-12-18 15:24:37 +0100179 drm_mm_takedown(&dev_priv->mm.stolen);
Chris Wilson9797fbf2012-04-24 15:47:39 +0100180}
181
182int i915_gem_init_stolen(struct drm_device *dev)
183{
184 struct drm_i915_private *dev_priv = dev->dev_private;
Chris Wilson9797fbf2012-04-24 15:47:39 +0100185
Chris Wilsone12a2d52012-11-15 11:32:18 +0000186 dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
187 if (dev_priv->mm.stolen_base == 0)
188 return 0;
189
Ben Widawskya54c0c22013-01-24 14:45:00 -0800190 DRM_DEBUG_KMS("found %zd bytes of stolen memory at %08lx\n",
191 dev_priv->gtt.stolen_size, dev_priv->mm.stolen_base);
Chris Wilsone12a2d52012-11-15 11:32:18 +0000192
Chris Wilson9797fbf2012-04-24 15:47:39 +0100193 /* Basic memrange allocator for stolen space */
Ben Widawskya54c0c22013-01-24 14:45:00 -0800194 drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->gtt.stolen_size);
Chris Wilson9797fbf2012-04-24 15:47:39 +0100195
196 return 0;
197}
Chris Wilson0104fdb2012-11-15 11:32:26 +0000198
199static struct sg_table *
200i915_pages_create_for_stolen(struct drm_device *dev,
201 u32 offset, u32 size)
202{
203 struct drm_i915_private *dev_priv = dev->dev_private;
204 struct sg_table *st;
205 struct scatterlist *sg;
206
207 DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
Ben Widawskya54c0c22013-01-24 14:45:00 -0800208 BUG_ON(offset > dev_priv->gtt.stolen_size - size);
Chris Wilson0104fdb2012-11-15 11:32:26 +0000209
210 /* We hide that we have no struct page backing our stolen object
211 * by wrapping the contiguous physical allocation with a fake
212 * dma mapping in a single scatterlist.
213 */
214
215 st = kmalloc(sizeof(*st), GFP_KERNEL);
216 if (st == NULL)
217 return NULL;
218
219 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
220 kfree(st);
221 return NULL;
222 }
223
224 sg = st->sgl;
Imre Deak5bd46872013-03-22 23:10:44 +0200225 /* we set the dummy page here only to make for_each_sg_page work */
226 sg_set_page(sg, dev_priv->gtt.scratch_page, size, offset);
Chris Wilson0104fdb2012-11-15 11:32:26 +0000227
228 sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;
229 sg_dma_len(sg) = size;
230
231 return st;
232}
233
234static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
235{
236 BUG();
237 return -EINVAL;
238}
239
240static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj)
241{
242 /* Should only be called during free */
243 sg_free_table(obj->pages);
244 kfree(obj->pages);
245}
246
247static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
248 .get_pages = i915_gem_object_get_pages_stolen,
249 .put_pages = i915_gem_object_put_pages_stolen,
250};
251
252static struct drm_i915_gem_object *
253_i915_gem_object_create_stolen(struct drm_device *dev,
254 struct drm_mm_node *stolen)
255{
256 struct drm_i915_gem_object *obj;
257
Chris Wilson42dcedd2012-11-15 11:32:30 +0000258 obj = i915_gem_object_alloc(dev);
Chris Wilson0104fdb2012-11-15 11:32:26 +0000259 if (obj == NULL)
260 return NULL;
261
262 if (drm_gem_private_object_init(dev, &obj->base, stolen->size))
263 goto cleanup;
264
265 i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
266
267 obj->pages = i915_pages_create_for_stolen(dev,
268 stolen->start, stolen->size);
269 if (obj->pages == NULL)
270 goto cleanup;
271
272 obj->has_dma_mapping = true;
273 obj->pages_pin_count = 1;
274 obj->stolen = stolen;
275
276 obj->base.write_domain = I915_GEM_DOMAIN_GTT;
277 obj->base.read_domains = I915_GEM_DOMAIN_GTT;
278 obj->cache_level = I915_CACHE_NONE;
279
280 return obj;
281
282cleanup:
Chris Wilson42dcedd2012-11-15 11:32:30 +0000283 i915_gem_object_free(obj);
Chris Wilson0104fdb2012-11-15 11:32:26 +0000284 return NULL;
285}
286
287struct drm_i915_gem_object *
288i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
289{
290 struct drm_i915_private *dev_priv = dev->dev_private;
291 struct drm_i915_gem_object *obj;
292 struct drm_mm_node *stolen;
293
294 if (dev_priv->mm.stolen_base == 0)
295 return NULL;
296
297 DRM_DEBUG_KMS("creating stolen object: size=%x\n", size);
298 if (size == 0)
299 return NULL;
300
301 stolen = drm_mm_search_free(&dev_priv->mm.stolen, size, 4096, 0);
302 if (stolen)
303 stolen = drm_mm_get_block(stolen, size, 4096);
304 if (stolen == NULL)
305 return NULL;
306
307 obj = _i915_gem_object_create_stolen(dev, stolen);
308 if (obj)
309 return obj;
310
311 drm_mm_put_block(stolen);
312 return NULL;
313}
314
Chris Wilson866d12b2013-02-19 13:31:37 -0800315struct drm_i915_gem_object *
316i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
317 u32 stolen_offset,
318 u32 gtt_offset,
319 u32 size)
320{
321 struct drm_i915_private *dev_priv = dev->dev_private;
322 struct drm_i915_gem_object *obj;
323 struct drm_mm_node *stolen;
324
325 if (dev_priv->mm.stolen_base == 0)
326 return NULL;
327
328 DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
329 stolen_offset, gtt_offset, size);
330
331 /* KISS and expect everything to be page-aligned */
332 BUG_ON(stolen_offset & 4095);
333 BUG_ON(gtt_offset & 4095);
334 BUG_ON(size & 4095);
335
336 if (WARN_ON(size == 0))
337 return NULL;
338
339 stolen = drm_mm_create_block(&dev_priv->mm.stolen,
340 stolen_offset, size,
341 false);
342 if (stolen == NULL) {
343 DRM_DEBUG_KMS("failed to allocate stolen space\n");
344 return NULL;
345 }
346
347 obj = _i915_gem_object_create_stolen(dev, stolen);
348 if (obj == NULL) {
349 DRM_DEBUG_KMS("failed to allocate stolen object\n");
350 drm_mm_put_block(stolen);
351 return NULL;
352 }
353
354 /* To simplify the initialisation sequence between KMS and GTT,
355 * we allow construction of the stolen object prior to
356 * setting up the GTT space. The actual reservation will occur
357 * later.
358 */
359 if (drm_mm_initialized(&dev_priv->mm.gtt_space)) {
360 obj->gtt_space = drm_mm_create_block(&dev_priv->mm.gtt_space,
361 gtt_offset, size,
362 false);
363 if (obj->gtt_space == NULL) {
364 DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
365 drm_gem_object_unreference(&obj->base);
366 return NULL;
367 }
368 } else
369 obj->gtt_space = I915_GTT_RESERVED;
370
371 obj->gtt_offset = gtt_offset;
372 obj->has_global_gtt_mapping = 1;
373
374 list_add_tail(&obj->gtt_list, &dev_priv->mm.bound_list);
375 list_add_tail(&obj->mm_list, &dev_priv->mm.inactive_list);
376
377 return obj;
378}
379
Chris Wilson0104fdb2012-11-15 11:32:26 +0000380void
381i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
382{
383 if (obj->stolen) {
384 drm_mm_put_block(obj->stolen);
385 obj->stolen = NULL;
386 }
387}