xref: /linux/drivers/gpu/drm/radeon/radeon_gart.c (revision a940daa52167e9db8ecce82213813b735a9d9f23)
1 /*
2  * Copyright 2008 Advanced Micro Devices, Inc.
3  * Copyright 2008 Red Hat Inc.
4  * Copyright 2009 Jerome Glisse.
5  *
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:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
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.
23  *
24  * Authors: Dave Airlie
25  *          Alex Deucher
26  *          Jerome Glisse
27  */
28 
29 #include <linux/pci.h>
30 #include <linux/vmalloc.h>
31 
32 #include <drm/radeon_drm.h>
33 #ifdef CONFIG_X86
34 #include <asm/set_memory.h>
35 #endif
36 #include "radeon.h"
37 
38 /*
39  * GART
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.
45  *
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.
54  *
55  * This file handles the common internal GART management.
56  */
57 
58 /*
59  * Common GART table functions.
60  */
61 /**
62  * radeon_gart_table_ram_alloc - allocate system ram for gart page table
63  *
64  * @rdev: radeon_device pointer
65  *
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.
70  */
radeon_gart_table_ram_alloc(struct radeon_device * rdev)71 int radeon_gart_table_ram_alloc(struct radeon_device *rdev)
72 {
73 	void *ptr;
74 
75 	ptr = dma_alloc_coherent(&rdev->pdev->dev, rdev->gart.table_size,
76 				 &rdev->gart.table_addr, GFP_KERNEL);
77 	if (!ptr)
78 		return -ENOMEM;
79 
80 #ifdef CONFIG_X86
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);
85 	}
86 #endif
87 	rdev->gart.ptr = ptr;
88 	return 0;
89 }
90 
91 /**
92  * radeon_gart_table_ram_free - free system ram for gart page table
93  *
94  * @rdev: radeon_device pointer
95  *
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.
99  */
radeon_gart_table_ram_free(struct radeon_device * rdev)100 void radeon_gart_table_ram_free(struct radeon_device *rdev)
101 {
102 	if (!rdev->gart.ptr)
103 		return;
104 
105 #ifdef CONFIG_X86
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);
110 	}
111 #endif
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;
116 }
117 
118 /**
119  * radeon_gart_table_vram_alloc - allocate vram for gart page table
120  *
121  * @rdev: radeon_device pointer
122  *
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.
127  */
radeon_gart_table_vram_alloc(struct radeon_device * rdev)128 int radeon_gart_table_vram_alloc(struct radeon_device *rdev)
129 {
130 	int r;
131 
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);
136 		if (r)
137 			return r;
138 	}
139 	return 0;
140 }
141 
142 /**
143  * radeon_gart_table_vram_pin - pin gart page table in vram
144  *
145  * @rdev: radeon_device pointer
146  *
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.
151  */
radeon_gart_table_vram_pin(struct radeon_device * rdev)152 int radeon_gart_table_vram_pin(struct radeon_device *rdev)
153 {
154 	uint64_t gpu_addr;
155 	int r;
156 
157 	r = radeon_bo_reserve(rdev->gart.robj, false);
158 	if (unlikely(r != 0))
159 		return r;
160 	r = radeon_bo_pin(rdev->gart.robj,
161 				RADEON_GEM_DOMAIN_VRAM, &gpu_addr);
162 	if (r) {
163 		radeon_bo_unreserve(rdev->gart.robj);
164 		return r;
165 	}
166 	r = radeon_bo_kmap(rdev->gart.robj, &rdev->gart.ptr);
167 	if (r)
168 		radeon_bo_unpin(rdev->gart.robj);
169 	radeon_bo_unreserve(rdev->gart.robj);
170 	rdev->gart.table_addr = gpu_addr;
171 
172 	if (!r) {
173 		int i;
174 
175 		/* We might have dropped some GART table updates while it wasn't
176 		 * mapped, restore all entries
177 		 */
178 		for (i = 0; i < rdev->gart.num_gpu_pages; i++)
179 			radeon_gart_set_page(rdev, i, rdev->gart.pages_entry[i]);
180 		mb();
181 		radeon_gart_tlb_flush(rdev);
182 	}
183 
184 	return r;
185 }
186 
187 /**
188  * radeon_gart_table_vram_unpin - unpin gart page table in vram
189  *
190  * @rdev: radeon_device pointer
191  *
192  * Unpin the GART page table in vram (pcie r4xx, r5xx+).
193  * These asics require the gart table to be in video memory.
194  */
radeon_gart_table_vram_unpin(struct radeon_device * rdev)195 void radeon_gart_table_vram_unpin(struct radeon_device *rdev)
196 {
197 	int r;
198 
199 	if (!rdev->gart.robj)
200 		return;
201 
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;
208 	}
209 }
210 
211 /**
212  * radeon_gart_table_vram_free - free gart page table vram
213  *
214  * @rdev: radeon_device pointer
215  *
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.
219  */
radeon_gart_table_vram_free(struct radeon_device * rdev)220 void radeon_gart_table_vram_free(struct radeon_device *rdev)
221 {
222 	if (!rdev->gart.robj)
223 		return;
224 
225 	radeon_bo_unref(&rdev->gart.robj);
226 }
227 
228 /*
229  * Common gart functions.
230  */
231 /**
232  * radeon_gart_unbind - unbind pages from the gart page table
233  *
234  * @rdev: radeon_device pointer
235  * @offset: offset into the GPU's gart aperture
236  * @pages: number of pages to unbind
237  *
238  * Unbinds the requested pages from the gart page table and
239  * replaces them with the dummy page (all asics).
240  */
radeon_gart_unbind(struct radeon_device * rdev,unsigned int offset,int pages)241 void radeon_gart_unbind(struct radeon_device *rdev, unsigned int offset,
242 			int pages)
243 {
244 	unsigned int t, p;
245 	int i, j;
246 
247 	if (!rdev->gart.ready) {
248 		WARN(1, "trying to unbind memory from uninitialized GART !\n");
249 		return;
250 	}
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);
261 				}
262 			}
263 		}
264 	}
265 	if (rdev->gart.ptr) {
266 		mb();
267 		radeon_gart_tlb_flush(rdev);
268 	}
269 }
270 
271 /**
272  * radeon_gart_bind - bind pages into the gart page table
273  *
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
280  *
281  * Binds the requested pages to the gart page table
282  * (all asics).
283  * Returns 0 for success, -EINVAL for failure.
284  */
radeon_gart_bind(struct radeon_device * rdev,unsigned int offset,int pages,struct page ** pagelist,dma_addr_t * dma_addr,uint32_t flags)285 int radeon_gart_bind(struct radeon_device *rdev, unsigned int offset,
286 		     int pages, struct page **pagelist, dma_addr_t *dma_addr,
287 		     uint32_t flags)
288 {
289 	unsigned int t, p;
290 	uint64_t page_base, page_entry;
291 	int i, j;
292 
293 	if (!rdev->gart.ready) {
294 		WARN(1, "trying to bind memory to uninitialized GART !\n");
295 		return -EINVAL;
296 	}
297 	t = offset / RADEON_GPU_PAGE_SIZE;
298 	p = t / (PAGE_SIZE / RADEON_GPU_PAGE_SIZE);
299 
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;
307 			if (rdev->gart.ptr)
308 				radeon_gart_set_page(rdev, t, page_entry);
309 
310 			page_base += RADEON_GPU_PAGE_SIZE;
311 		}
312 	}
313 	if (rdev->gart.ptr) {
314 		mb();
315 		radeon_gart_tlb_flush(rdev);
316 	}
317 	return 0;
318 }
319 
320 /**
321  * radeon_gart_init - init the driver info for managing the gart
322  *
323  * @rdev: radeon_device pointer
324  *
325  * Allocate the dummy page and init the gart driver info (all asics).
326  * Returns 0 for success, error for failure.
327  */
radeon_gart_init(struct radeon_device * rdev)328 int radeon_gart_init(struct radeon_device *rdev)
329 {
330 	int r, i;
331 
332 	if (rdev->gart.pages)
333 		return 0;
334 
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");
338 		return -EINVAL;
339 	}
340 	r = radeon_dummy_page_init(rdev);
341 	if (r)
342 		return r;
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);
353 		return -ENOMEM;
354 	}
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);
359 		return -ENOMEM;
360 	}
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;
364 	return 0;
365 }
366 
367 /**
368  * radeon_gart_fini - tear down the driver info for managing the gart
369  *
370  * @rdev: radeon_device pointer
371  *
372  * Tear down the gart driver info and free the dummy page (all asics).
373  */
radeon_gart_fini(struct radeon_device * rdev)374 void radeon_gart_fini(struct radeon_device *rdev)
375 {
376 	if (rdev->gart.ready) {
377 		/* unbind pages */
378 		radeon_gart_unbind(rdev, 0, rdev->gart.num_cpu_pages);
379 	}
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;
385 
386 	radeon_dummy_page_fini(rdev);
387 }
388