2 * Copyright © 2010 Daniel Vetter
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:
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 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
26 #include <drm/i915_drm.h>
28 #include "i915_trace.h"
29 #include "intel_drv.h"
31 typedef uint32_t gtt_pte_t;
33 static inline gtt_pte_t pte_encode(struct drm_device *dev,
35 enum i915_cache_level level)
37 gtt_pte_t pte = GEN6_PTE_VALID;
38 pte |= GEN6_PTE_ADDR_ENCODE(addr);
41 case I915_CACHE_LLC_MLC:
42 /* Haswell doesn't set L3 this way */
44 pte |= GEN6_PTE_CACHE_LLC;
46 pte |= GEN6_PTE_CACHE_LLC_MLC;
49 pte |= GEN6_PTE_CACHE_LLC;
53 pte |= HSW_PTE_UNCACHED;
55 pte |= GEN6_PTE_UNCACHED;
65 /* PPGTT support for Sandybdrige/Gen6 and later */
66 static void i915_ppgtt_clear_range(struct i915_hw_ppgtt *ppgtt,
71 gtt_pte_t scratch_pte;
72 unsigned act_pd = first_entry / I915_PPGTT_PT_ENTRIES;
73 unsigned first_pte = first_entry % I915_PPGTT_PT_ENTRIES;
76 scratch_pte = pte_encode(ppgtt->dev, ppgtt->scratch_page_dma_addr,
80 last_pte = first_pte + num_entries;
81 if (last_pte > I915_PPGTT_PT_ENTRIES)
82 last_pte = I915_PPGTT_PT_ENTRIES;
84 pt_vaddr = kmap_atomic(ppgtt->pt_pages[act_pd]);
86 for (i = first_pte; i < last_pte; i++)
87 pt_vaddr[i] = scratch_pte;
89 kunmap_atomic(pt_vaddr);
91 num_entries -= last_pte - first_pte;
97 int i915_gem_init_aliasing_ppgtt(struct drm_device *dev)
99 struct drm_i915_private *dev_priv = dev->dev_private;
100 struct i915_hw_ppgtt *ppgtt;
101 unsigned first_pd_entry_in_global_pt;
105 /* ppgtt PDEs reside in the global gtt pagetable, which has 512*1024
106 * entries. For aliasing ppgtt support we just steal them at the end for
108 first_pd_entry_in_global_pt = dev_priv->mm.gtt->gtt_total_entries - I915_PPGTT_PD_ENTRIES;
110 ppgtt = kzalloc(sizeof(*ppgtt), GFP_KERNEL);
115 ppgtt->num_pd_entries = I915_PPGTT_PD_ENTRIES;
116 ppgtt->pt_pages = kzalloc(sizeof(struct page *)*ppgtt->num_pd_entries,
118 if (!ppgtt->pt_pages)
121 for (i = 0; i < ppgtt->num_pd_entries; i++) {
122 ppgtt->pt_pages[i] = alloc_page(GFP_KERNEL);
123 if (!ppgtt->pt_pages[i])
127 if (dev_priv->mm.gtt->needs_dmar) {
128 ppgtt->pt_dma_addr = kzalloc(sizeof(dma_addr_t)
129 *ppgtt->num_pd_entries,
131 if (!ppgtt->pt_dma_addr)
134 for (i = 0; i < ppgtt->num_pd_entries; i++) {
137 pt_addr = pci_map_page(dev->pdev, ppgtt->pt_pages[i],
139 PCI_DMA_BIDIRECTIONAL);
141 if (pci_dma_mapping_error(dev->pdev,
147 ppgtt->pt_dma_addr[i] = pt_addr;
151 ppgtt->scratch_page_dma_addr = dev_priv->mm.gtt->scratch_page_dma;
153 i915_ppgtt_clear_range(ppgtt, 0,
154 ppgtt->num_pd_entries*I915_PPGTT_PT_ENTRIES);
156 ppgtt->pd_offset = (first_pd_entry_in_global_pt)*sizeof(gtt_pte_t);
158 dev_priv->mm.aliasing_ppgtt = ppgtt;
163 if (ppgtt->pt_dma_addr) {
164 for (i--; i >= 0; i--)
165 pci_unmap_page(dev->pdev, ppgtt->pt_dma_addr[i],
166 4096, PCI_DMA_BIDIRECTIONAL);
169 kfree(ppgtt->pt_dma_addr);
170 for (i = 0; i < ppgtt->num_pd_entries; i++) {
171 if (ppgtt->pt_pages[i])
172 __free_page(ppgtt->pt_pages[i]);
174 kfree(ppgtt->pt_pages);
181 void i915_gem_cleanup_aliasing_ppgtt(struct drm_device *dev)
183 struct drm_i915_private *dev_priv = dev->dev_private;
184 struct i915_hw_ppgtt *ppgtt = dev_priv->mm.aliasing_ppgtt;
190 if (ppgtt->pt_dma_addr) {
191 for (i = 0; i < ppgtt->num_pd_entries; i++)
192 pci_unmap_page(dev->pdev, ppgtt->pt_dma_addr[i],
193 4096, PCI_DMA_BIDIRECTIONAL);
196 kfree(ppgtt->pt_dma_addr);
197 for (i = 0; i < ppgtt->num_pd_entries; i++)
198 __free_page(ppgtt->pt_pages[i]);
199 kfree(ppgtt->pt_pages);
203 static void i915_ppgtt_insert_sg_entries(struct i915_hw_ppgtt *ppgtt,
204 const struct sg_table *pages,
205 unsigned first_entry,
206 enum i915_cache_level cache_level)
209 unsigned act_pd = first_entry / I915_PPGTT_PT_ENTRIES;
210 unsigned first_pte = first_entry % I915_PPGTT_PT_ENTRIES;
211 unsigned i, j, m, segment_len;
212 dma_addr_t page_addr;
213 struct scatterlist *sg;
215 /* init sg walking */
218 segment_len = sg_dma_len(sg) >> PAGE_SHIFT;
221 while (i < pages->nents) {
222 pt_vaddr = kmap_atomic(ppgtt->pt_pages[act_pd]);
224 for (j = first_pte; j < I915_PPGTT_PT_ENTRIES; j++) {
225 page_addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
226 pt_vaddr[j] = pte_encode(ppgtt->dev, page_addr,
229 /* grab the next page */
230 if (++m == segment_len) {
231 if (++i == pages->nents)
235 segment_len = sg_dma_len(sg) >> PAGE_SHIFT;
240 kunmap_atomic(pt_vaddr);
247 void i915_ppgtt_bind_object(struct i915_hw_ppgtt *ppgtt,
248 struct drm_i915_gem_object *obj,
249 enum i915_cache_level cache_level)
251 i915_ppgtt_insert_sg_entries(ppgtt,
253 obj->gtt_space->start >> PAGE_SHIFT,
257 void i915_ppgtt_unbind_object(struct i915_hw_ppgtt *ppgtt,
258 struct drm_i915_gem_object *obj)
260 i915_ppgtt_clear_range(ppgtt,
261 obj->gtt_space->start >> PAGE_SHIFT,
262 obj->base.size >> PAGE_SHIFT);
265 static bool do_idling(struct drm_i915_private *dev_priv)
267 bool ret = dev_priv->mm.interruptible;
269 if (unlikely(dev_priv->mm.gtt->do_idle_maps)) {
270 dev_priv->mm.interruptible = false;
271 if (i915_gpu_idle(dev_priv->dev)) {
272 DRM_ERROR("Couldn't idle GPU\n");
273 /* Wait a bit, in hopes it avoids the hang */
281 static void undo_idling(struct drm_i915_private *dev_priv, bool interruptible)
283 if (unlikely(dev_priv->mm.gtt->do_idle_maps))
284 dev_priv->mm.interruptible = interruptible;
288 static void i915_ggtt_clear_range(struct drm_device *dev,
289 unsigned first_entry,
290 unsigned num_entries)
292 struct drm_i915_private *dev_priv = dev->dev_private;
293 gtt_pte_t scratch_pte;
294 volatile void __iomem *gtt_base = dev_priv->mm.gtt->gtt + first_entry;
295 const int max_entries = dev_priv->mm.gtt->gtt_total_entries - first_entry;
297 if (INTEL_INFO(dev)->gen < 6) {
298 intel_gtt_clear_range(first_entry, num_entries);
302 if (WARN(num_entries > max_entries,
303 "First entry = %d; Num entries = %d (max=%d)\n",
304 first_entry, num_entries, max_entries))
305 num_entries = max_entries;
307 scratch_pte = pte_encode(dev, dev_priv->mm.gtt->scratch_page_dma, I915_CACHE_LLC);
308 memset_io(gtt_base, scratch_pte, num_entries * sizeof(scratch_pte));
312 void i915_gem_restore_gtt_mappings(struct drm_device *dev)
314 struct drm_i915_private *dev_priv = dev->dev_private;
315 struct drm_i915_gem_object *obj;
317 /* First fill our portion of the GTT with scratch pages */
318 i915_ggtt_clear_range(dev, dev_priv->mm.gtt_start / PAGE_SIZE,
319 (dev_priv->mm.gtt_end - dev_priv->mm.gtt_start) / PAGE_SIZE);
321 list_for_each_entry(obj, &dev_priv->mm.bound_list, gtt_list) {
322 i915_gem_clflush_object(obj);
323 i915_gem_gtt_bind_object(obj, obj->cache_level);
326 i915_gem_chipset_flush(dev);
329 int i915_gem_gtt_prepare_object(struct drm_i915_gem_object *obj)
331 if (obj->has_dma_mapping)
334 if (!dma_map_sg(&obj->base.dev->pdev->dev,
335 obj->pages->sgl, obj->pages->nents,
336 PCI_DMA_BIDIRECTIONAL))
343 * Binds an object into the global gtt with the specified cache level. The object
344 * will be accessible to the GPU via commands whose operands reference offsets
345 * within the global GTT as well as accessible by the GPU through the GMADR
346 * mapped BAR (dev_priv->mm.gtt->gtt).
348 static void gen6_ggtt_bind_object(struct drm_i915_gem_object *obj,
349 enum i915_cache_level level)
351 struct drm_device *dev = obj->base.dev;
352 struct drm_i915_private *dev_priv = dev->dev_private;
353 struct sg_table *st = obj->pages;
354 struct scatterlist *sg = st->sgl;
355 const int first_entry = obj->gtt_space->start >> PAGE_SHIFT;
356 const int max_entries = dev_priv->mm.gtt->gtt_total_entries - first_entry;
357 gtt_pte_t __iomem *gtt_entries = dev_priv->mm.gtt->gtt + first_entry;
359 unsigned int len, m = 0;
362 for_each_sg(st->sgl, sg, st->nents, unused) {
363 len = sg_dma_len(sg) >> PAGE_SHIFT;
364 for (m = 0; m < len; m++) {
365 addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
366 gtt_entries[i] = pte_encode(dev, addr, level);
371 BUG_ON(i > max_entries);
372 BUG_ON(i != obj->base.size / PAGE_SIZE);
374 /* XXX: This serves as a posting read to make sure that the PTE has
375 * actually been updated. There is some concern that even though
376 * registers and PTEs are within the same BAR that they are potentially
377 * of NUMA access patterns. Therefore, even with the way we assume
378 * hardware should work, we must keep this posting read for paranoia.
381 WARN_ON(readl(>t_entries[i-1]) != pte_encode(dev, addr, level));
384 void i915_gem_gtt_bind_object(struct drm_i915_gem_object *obj,
385 enum i915_cache_level cache_level)
387 struct drm_device *dev = obj->base.dev;
388 if (INTEL_INFO(dev)->gen < 6) {
389 unsigned int flags = (cache_level == I915_CACHE_NONE) ?
390 AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY;
391 intel_gtt_insert_sg_entries(obj->pages,
392 obj->gtt_space->start >> PAGE_SHIFT,
395 gen6_ggtt_bind_object(obj, cache_level);
398 obj->has_global_gtt_mapping = 1;
401 void i915_gem_gtt_unbind_object(struct drm_i915_gem_object *obj)
403 i915_ggtt_clear_range(obj->base.dev,
404 obj->gtt_space->start >> PAGE_SHIFT,
405 obj->base.size >> PAGE_SHIFT);
407 obj->has_global_gtt_mapping = 0;
410 void i915_gem_gtt_finish_object(struct drm_i915_gem_object *obj)
412 struct drm_device *dev = obj->base.dev;
413 struct drm_i915_private *dev_priv = dev->dev_private;
416 interruptible = do_idling(dev_priv);
418 if (!obj->has_dma_mapping)
419 dma_unmap_sg(&dev->pdev->dev,
420 obj->pages->sgl, obj->pages->nents,
421 PCI_DMA_BIDIRECTIONAL);
423 undo_idling(dev_priv, interruptible);
426 static void i915_gtt_color_adjust(struct drm_mm_node *node,
428 unsigned long *start,
431 if (node->color != color)
434 if (!list_empty(&node->node_list)) {
435 node = list_entry(node->node_list.next,
438 if (node->allocated && node->color != color)
443 void i915_gem_init_global_gtt(struct drm_device *dev,
445 unsigned long mappable_end,
448 drm_i915_private_t *dev_priv = dev->dev_private;
450 /* Substract the guard page ... */
451 drm_mm_init(&dev_priv->mm.gtt_space, start, end - start - PAGE_SIZE);
453 dev_priv->mm.gtt_space.color_adjust = i915_gtt_color_adjust;
455 dev_priv->mm.gtt_start = start;
456 dev_priv->mm.gtt_mappable_end = mappable_end;
457 dev_priv->mm.gtt_end = end;
458 dev_priv->mm.gtt_total = end - start;
459 dev_priv->mm.mappable_gtt_total = min(end, mappable_end) - start;
461 /* ... but ensure that we clear the entire range. */
462 i915_ggtt_clear_range(dev, start / PAGE_SIZE, (end-start) / PAGE_SIZE);
465 static int setup_scratch_page(struct drm_device *dev)
467 struct drm_i915_private *dev_priv = dev->dev_private;
471 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
475 set_pages_uc(page, 1);
477 #ifdef CONFIG_INTEL_IOMMU
478 dma_addr = pci_map_page(dev->pdev, page, 0, PAGE_SIZE,
479 PCI_DMA_BIDIRECTIONAL);
480 if (pci_dma_mapping_error(dev->pdev, dma_addr))
483 dma_addr = page_to_phys(page);
485 dev_priv->mm.gtt->scratch_page = page;
486 dev_priv->mm.gtt->scratch_page_dma = dma_addr;
491 static void teardown_scratch_page(struct drm_device *dev)
493 struct drm_i915_private *dev_priv = dev->dev_private;
494 set_pages_wb(dev_priv->mm.gtt->scratch_page, 1);
495 pci_unmap_page(dev->pdev, dev_priv->mm.gtt->scratch_page_dma,
496 PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
497 put_page(dev_priv->mm.gtt->scratch_page);
498 __free_page(dev_priv->mm.gtt->scratch_page);
501 static inline unsigned int gen6_get_total_gtt_size(u16 snb_gmch_ctl)
503 snb_gmch_ctl >>= SNB_GMCH_GGMS_SHIFT;
504 snb_gmch_ctl &= SNB_GMCH_GGMS_MASK;
505 return snb_gmch_ctl << 20;
508 static inline unsigned int gen6_get_stolen_size(u16 snb_gmch_ctl)
510 snb_gmch_ctl >>= SNB_GMCH_GMS_SHIFT;
511 snb_gmch_ctl &= SNB_GMCH_GMS_MASK;
512 return snb_gmch_ctl << 25; /* 32 MB units */
515 static inline unsigned int gen7_get_stolen_size(u16 snb_gmch_ctl)
517 static const int stolen_decoder[] = {
518 0, 0, 0, 0, 0, 32, 48, 64, 128, 256, 96, 160, 224, 352};
519 snb_gmch_ctl >>= IVB_GMCH_GMS_SHIFT;
520 snb_gmch_ctl &= IVB_GMCH_GMS_MASK;
521 return stolen_decoder[snb_gmch_ctl] << 20;
524 int i915_gem_gtt_init(struct drm_device *dev)
526 struct drm_i915_private *dev_priv = dev->dev_private;
527 phys_addr_t gtt_bus_addr;
532 /* On modern platforms we need not worry ourself with the legacy
533 * hostbridge query stuff. Skip it entirely
535 if (INTEL_INFO(dev)->gen < 6) {
536 ret = intel_gmch_probe(dev_priv->bridge_dev, dev->pdev, NULL);
538 DRM_ERROR("failed to set up gmch\n");
542 dev_priv->mm.gtt = intel_gtt_get();
543 if (!dev_priv->mm.gtt) {
544 DRM_ERROR("Failed to initialize GTT\n");
551 dev_priv->mm.gtt = kzalloc(sizeof(*dev_priv->mm.gtt), GFP_KERNEL);
552 if (!dev_priv->mm.gtt)
555 if (!pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(40)))
556 pci_set_consistent_dma_mask(dev->pdev, DMA_BIT_MASK(40));
558 pci_read_config_dword(dev->pdev, PCI_BASE_ADDRESS_0, &tmp);
559 /* For GEN6+ the PTEs for the ggtt live at 2MB + BAR0 */
560 gtt_bus_addr = (tmp & PCI_BASE_ADDRESS_MEM_MASK) + (2<<20);
562 pci_read_config_dword(dev->pdev, PCI_BASE_ADDRESS_2, &tmp);
563 dev_priv->mm.gtt->gma_bus_addr = tmp & PCI_BASE_ADDRESS_MEM_MASK;
566 pci_read_config_word(dev->pdev, SNB_GMCH_CTRL, &snb_gmch_ctl);
567 dev_priv->mm.gtt->gtt_total_entries =
568 gen6_get_total_gtt_size(snb_gmch_ctl) / sizeof(gtt_pte_t);
569 if (INTEL_INFO(dev)->gen < 7)
570 dev_priv->mm.gtt->stolen_size = gen6_get_stolen_size(snb_gmch_ctl);
572 dev_priv->mm.gtt->stolen_size = gen7_get_stolen_size(snb_gmch_ctl);
574 dev_priv->mm.gtt->gtt_mappable_entries = pci_resource_len(dev->pdev, 2) >> PAGE_SHIFT;
575 /* 64/512MB is the current min/max we actually know of, but this is just a
576 * coarse sanity check.
578 if ((dev_priv->mm.gtt->gtt_mappable_entries >> 8) < 64 ||
579 dev_priv->mm.gtt->gtt_mappable_entries > dev_priv->mm.gtt->gtt_total_entries) {
580 DRM_ERROR("Unknown GMADR entries (%d)\n",
581 dev_priv->mm.gtt->gtt_mappable_entries);
586 ret = setup_scratch_page(dev);
588 DRM_ERROR("Scratch setup failed\n");
592 dev_priv->mm.gtt->gtt = ioremap(gtt_bus_addr,
593 dev_priv->mm.gtt->gtt_total_entries * sizeof(gtt_pte_t));
594 if (!dev_priv->mm.gtt->gtt) {
595 DRM_ERROR("Failed to map the gtt page table\n");
596 teardown_scratch_page(dev);
601 /* GMADR is the PCI aperture used by SW to access tiled GFX surfaces in a linear fashion. */
602 DRM_INFO("Memory Usable by graphics device = %dK\n", dev_priv->mm.gtt->gtt_total_entries >> 10);
603 DRM_DEBUG_DRIVER("GMADR size = %dM\n", dev_priv->mm.gtt->gtt_mappable_entries >> 8);
604 DRM_DEBUG_DRIVER("GTT stolen size = %dM\n", dev_priv->mm.gtt->stolen_size >> 20);
609 kfree(dev_priv->mm.gtt);
610 if (INTEL_INFO(dev)->gen < 6)
615 void i915_gem_gtt_fini(struct drm_device *dev)
617 struct drm_i915_private *dev_priv = dev->dev_private;
618 iounmap(dev_priv->mm.gtt->gtt);
619 teardown_scratch_page(dev);
620 if (INTEL_INFO(dev)->gen < 6)
622 kfree(dev_priv->mm.gtt);