2 * Copyright 2008 Advanced Micro Devices, Inc.
3 * Copyright 2008 Red Hat Inc.
4 * Copyright 2009 Jerome Glisse.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
24 * Authors: Dave Airlie
29 #include <linux/pci.h>
30 #include <linux/vmalloc.h>
32 #include <drm/radeon_drm.h>
34 #include <asm/set_memory.h>
40 * The GART (Graphics Aperture Remapping Table) is an aperture
41 * in the GPU's address space. System pages can be mapped into
42 * the aperture and look like contiguous pages from the GPU's
43 * perspective. A page table maps the pages in the aperture
44 * to the actual backing pages in system memory.
46 * Radeon GPUs support both an internal GART, as described above,
47 * and AGP. AGP works similarly, but the GART table is configured
48 * and maintained by the northbridge rather than the driver.
49 * Radeon hw has a separate AGP aperture that is programmed to
50 * point to the AGP aperture provided by the northbridge and the
51 * requests are passed through to the northbridge aperture.
52 * Both AGP and internal GART can be used at the same time, however
53 * that is not currently supported by the driver.
55 * This file handles the common internal GART management.
59 * Common GART table functions.
62 * radeon_gart_table_ram_alloc - allocate system ram for gart page table
64 * @rdev: radeon_device pointer
66 * Allocate system memory for GART page table
67 * (r1xx-r3xx, non-pcie r4xx, rs400). These asics require the
68 * gart table to be in system memory.
69 * Returns 0 for success, -ENOMEM for failure.
71 int radeon_gart_table_ram_alloc(struct radeon_device *rdev)
75 ptr = dma_alloc_coherent(&rdev->pdev->dev, rdev->gart.table_size,
76 &rdev->gart.table_addr, GFP_KERNEL);
81 if (rdev->family == CHIP_RS400 || rdev->family == CHIP_RS480 ||
82 rdev->family == CHIP_RS690 || rdev->family == CHIP_RS740) {
83 set_memory_uc((unsigned long)ptr,
84 rdev->gart.table_size >> PAGE_SHIFT);
92 * radeon_gart_table_ram_free - free system ram for gart page table
94 * @rdev: radeon_device pointer
96 * Free system memory for GART page table
97 * (r1xx-r3xx, non-pcie r4xx, rs400). These asics require the
98 * gart table to be in system memory.
100 void radeon_gart_table_ram_free(struct radeon_device *rdev)
106 if (rdev->family == CHIP_RS400 || rdev->family == CHIP_RS480 ||
107 rdev->family == CHIP_RS690 || rdev->family == CHIP_RS740) {
108 set_memory_wb((unsigned long)rdev->gart.ptr,
109 rdev->gart.table_size >> PAGE_SHIFT);
112 dma_free_coherent(&rdev->pdev->dev, rdev->gart.table_size,
113 (void *)rdev->gart.ptr, rdev->gart.table_addr);
114 rdev->gart.ptr = NULL;
115 rdev->gart.table_addr = 0;
119 * radeon_gart_table_vram_alloc - allocate vram for gart page table
121 * @rdev: radeon_device pointer
123 * Allocate video memory for GART page table
124 * (pcie r4xx, r5xx+). These asics require the
125 * gart table to be in video memory.
126 * Returns 0 for success, error for failure.
128 int radeon_gart_table_vram_alloc(struct radeon_device *rdev)
132 if (rdev->gart.robj == NULL) {
133 r = radeon_bo_create(rdev, rdev->gart.table_size,
134 PAGE_SIZE, true, RADEON_GEM_DOMAIN_VRAM,
135 0, NULL, NULL, &rdev->gart.robj);
143 * radeon_gart_table_vram_pin - pin gart page table in vram
145 * @rdev: radeon_device pointer
147 * Pin the GART page table in vram so it will not be moved
148 * by the memory manager (pcie r4xx, r5xx+). These asics require the
149 * gart table to be in video memory.
150 * Returns 0 for success, error for failure.
152 int radeon_gart_table_vram_pin(struct radeon_device *rdev)
157 r = radeon_bo_reserve(rdev->gart.robj, false);
158 if (unlikely(r != 0))
160 r = radeon_bo_pin(rdev->gart.robj,
161 RADEON_GEM_DOMAIN_VRAM, &gpu_addr);
163 radeon_bo_unreserve(rdev->gart.robj);
166 r = radeon_bo_kmap(rdev->gart.robj, &rdev->gart.ptr);
168 radeon_bo_unpin(rdev->gart.robj);
169 radeon_bo_unreserve(rdev->gart.robj);
170 rdev->gart.table_addr = gpu_addr;
175 /* We might have dropped some GART table updates while it wasn't
176 * mapped, restore all entries
178 for (i = 0; i < rdev->gart.num_gpu_pages; i++)
179 radeon_gart_set_page(rdev, i, rdev->gart.pages_entry[i]);
181 radeon_gart_tlb_flush(rdev);
188 * radeon_gart_table_vram_unpin - unpin gart page table in vram
190 * @rdev: radeon_device pointer
192 * Unpin the GART page table in vram (pcie r4xx, r5xx+).
193 * These asics require the gart table to be in video memory.
195 void radeon_gart_table_vram_unpin(struct radeon_device *rdev)
199 if (!rdev->gart.robj)
202 r = radeon_bo_reserve(rdev->gart.robj, false);
203 if (likely(r == 0)) {
204 radeon_bo_kunmap(rdev->gart.robj);
205 radeon_bo_unpin(rdev->gart.robj);
206 radeon_bo_unreserve(rdev->gart.robj);
207 rdev->gart.ptr = NULL;
212 * radeon_gart_table_vram_free - free gart page table vram
214 * @rdev: radeon_device pointer
216 * Free the video memory used for the GART page table
217 * (pcie r4xx, r5xx+). These asics require the gart table to
218 * be in video memory.
220 void radeon_gart_table_vram_free(struct radeon_device *rdev)
222 if (!rdev->gart.robj)
225 radeon_bo_unref(&rdev->gart.robj);
229 * Common gart functions.
232 * radeon_gart_unbind - unbind pages from the gart page table
234 * @rdev: radeon_device pointer
235 * @offset: offset into the GPU's gart aperture
236 * @pages: number of pages to unbind
238 * Unbinds the requested pages from the gart page table and
239 * replaces them with the dummy page (all asics).
241 void radeon_gart_unbind(struct radeon_device *rdev, unsigned int offset,
247 if (!rdev->gart.ready) {
248 WARN(1, "trying to unbind memory from uninitialized GART !\n");
251 t = offset / RADEON_GPU_PAGE_SIZE;
252 p = t / (PAGE_SIZE / RADEON_GPU_PAGE_SIZE);
253 for (i = 0; i < pages; i++, p++) {
254 if (rdev->gart.pages[p]) {
255 rdev->gart.pages[p] = NULL;
256 for (j = 0; j < (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); j++, t++) {
257 rdev->gart.pages_entry[t] = rdev->dummy_page.entry;
258 if (rdev->gart.ptr) {
259 radeon_gart_set_page(rdev, t,
260 rdev->dummy_page.entry);
265 if (rdev->gart.ptr) {
267 radeon_gart_tlb_flush(rdev);
272 * radeon_gart_bind - bind pages into the gart page table
274 * @rdev: radeon_device pointer
275 * @offset: offset into the GPU's gart aperture
276 * @pages: number of pages to bind
277 * @pagelist: pages to bind
278 * @dma_addr: DMA addresses of pages
279 * @flags: RADEON_GART_PAGE_* flags
281 * Binds the requested pages to the gart page table
283 * Returns 0 for success, -EINVAL for failure.
285 int radeon_gart_bind(struct radeon_device *rdev, unsigned int offset,
286 int pages, struct page **pagelist, dma_addr_t *dma_addr,
290 uint64_t page_base, page_entry;
293 if (!rdev->gart.ready) {
294 WARN(1, "trying to bind memory to uninitialized GART !\n");
297 t = offset / RADEON_GPU_PAGE_SIZE;
298 p = t / (PAGE_SIZE / RADEON_GPU_PAGE_SIZE);
300 for (i = 0; i < pages; i++, p++) {
301 rdev->gart.pages[p] = pagelist ? pagelist[i] :
302 rdev->dummy_page.page;
303 page_base = dma_addr[i];
304 for (j = 0; j < (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); j++, t++) {
305 page_entry = radeon_gart_get_page_entry(page_base, flags);
306 rdev->gart.pages_entry[t] = page_entry;
308 radeon_gart_set_page(rdev, t, page_entry);
310 page_base += RADEON_GPU_PAGE_SIZE;
313 if (rdev->gart.ptr) {
315 radeon_gart_tlb_flush(rdev);
321 * radeon_gart_init - init the driver info for managing the gart
323 * @rdev: radeon_device pointer
325 * Allocate the dummy page and init the gart driver info (all asics).
326 * Returns 0 for success, error for failure.
328 int radeon_gart_init(struct radeon_device *rdev)
332 if (rdev->gart.pages)
335 /* We need PAGE_SIZE >= RADEON_GPU_PAGE_SIZE */
336 if (PAGE_SIZE < RADEON_GPU_PAGE_SIZE) {
337 DRM_ERROR("Page size is smaller than GPU page size!\n");
340 r = radeon_dummy_page_init(rdev);
343 /* Compute table size */
344 rdev->gart.num_cpu_pages = rdev->mc.gtt_size / PAGE_SIZE;
345 rdev->gart.num_gpu_pages = rdev->mc.gtt_size / RADEON_GPU_PAGE_SIZE;
346 DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n",
347 rdev->gart.num_cpu_pages, rdev->gart.num_gpu_pages);
348 /* Allocate pages table */
349 rdev->gart.pages = vzalloc(array_size(sizeof(void *),
350 rdev->gart.num_cpu_pages));
351 if (rdev->gart.pages == NULL) {
352 radeon_gart_fini(rdev);
355 rdev->gart.pages_entry = vmalloc(array_size(sizeof(uint64_t),
356 rdev->gart.num_gpu_pages));
357 if (rdev->gart.pages_entry == NULL) {
358 radeon_gart_fini(rdev);
361 /* set GART entry to point to the dummy page by default */
362 for (i = 0; i < rdev->gart.num_gpu_pages; i++)
363 rdev->gart.pages_entry[i] = rdev->dummy_page.entry;
368 * radeon_gart_fini - tear down the driver info for managing the gart
370 * @rdev: radeon_device pointer
372 * Tear down the gart driver info and free the dummy page (all asics).
374 void radeon_gart_fini(struct radeon_device *rdev)
376 if (rdev->gart.ready) {
378 radeon_gart_unbind(rdev, 0, rdev->gart.num_cpu_pages);
380 rdev->gart.ready = false;
381 vfree(rdev->gart.pages);
382 vfree(rdev->gart.pages_entry);
383 rdev->gart.pages = NULL;
384 rdev->gart.pages_entry = NULL;
386 radeon_dummy_page_fini(rdev);