1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2019 Intel Corporation
4 */
5
6#include <linux/prandom.h>
7
8#include <drm/drm_print.h>
9#include <uapi/drm/i915_drm.h>
10
11#include "intel_memory_region.h"
12#include "i915_drv.h"
13#include "i915_ttm_buddy_manager.h"
14
15static const struct {
16 u16 class;
17 u16 instance;
18} intel_region_map[] = {
19 [INTEL_REGION_SMEM] = {
20 .class = INTEL_MEMORY_SYSTEM,
21 .instance = 0,
22 },
23 [INTEL_REGION_LMEM_0] = {
24 .class = INTEL_MEMORY_LOCAL,
25 .instance = 0,
26 },
27 [INTEL_REGION_STOLEN_SMEM] = {
28 .class = INTEL_MEMORY_STOLEN_SYSTEM,
29 .instance = 0,
30 },
31 [INTEL_REGION_STOLEN_LMEM] = {
32 .class = INTEL_MEMORY_STOLEN_LOCAL,
33 .instance = 0,
34 },
35};
36
37static int __iopagetest(struct intel_memory_region *mem,
38 u8 __iomem *va, int pagesize,
39 u8 value, resource_size_t offset,
40 const void *caller)
41{
42 int byte = get_random_u32_below(ceil: pagesize);
43 u8 result[3];
44
45 memset_io(va, value, pagesize); /* or GPF! */
46 wmb();
47
48 result[0] = ioread8(va);
49 result[1] = ioread8(va + byte);
50 result[2] = ioread8(va + pagesize - 1);
51 if (memchr_inv(p: result, c: value, size: sizeof(result))) {
52 dev_err(mem->i915->drm.dev,
53 "Failed to read back from memory region:%pR at [%pa + %pa] for %ps; wrote %x, read (%x, %x, %x)\n",
54 &mem->region, &mem->io.start, &offset, caller,
55 value, result[0], result[1], result[2]);
56 return -EINVAL;
57 }
58
59 return 0;
60}
61
62static int iopagetest(struct intel_memory_region *mem,
63 resource_size_t offset,
64 const void *caller)
65{
66 const u8 val[] = { 0x0, 0xa5, 0xc3, 0xf0 };
67 void __iomem *va;
68 int err;
69 int i;
70
71 va = ioremap_wc(offset: mem->io.start + offset, PAGE_SIZE);
72 if (!va) {
73 dev_err(mem->i915->drm.dev,
74 "Failed to ioremap memory region [%pa + %pa] for %ps\n",
75 &mem->io.start, &offset, caller);
76 return -EFAULT;
77 }
78
79 for (i = 0; i < ARRAY_SIZE(val); i++) {
80 err = __iopagetest(mem, va, PAGE_SIZE, value: val[i], offset, caller);
81 if (err)
82 break;
83
84 err = __iopagetest(mem, va, PAGE_SIZE, value: ~val[i], offset, caller);
85 if (err)
86 break;
87 }
88
89 iounmap(addr: va);
90 return err;
91}
92
93static resource_size_t random_page(resource_size_t last)
94{
95 /* Limited to low 44b (16TiB), but should suffice for a spot check */
96 return get_random_u32_below(ceil: last >> PAGE_SHIFT) << PAGE_SHIFT;
97}
98
99static int iomemtest(struct intel_memory_region *mem,
100 bool test_all,
101 const void *caller)
102{
103 resource_size_t last, page;
104 int err;
105
106 if (resource_size(res: &mem->io) < PAGE_SIZE)
107 return 0;
108
109 last = resource_size(res: &mem->io) - PAGE_SIZE;
110
111 /*
112 * Quick test to check read/write access to the iomap (backing store).
113 *
114 * Write a byte, read it back. If the iomapping fails, we expect
115 * a GPF preventing further execution. If the backing store does not
116 * exist, the read back will return garbage. We check a couple of pages,
117 * the first and last of the specified region to confirm the backing
118 * store + iomap does cover the entire memory region; and we check
119 * a random offset within as a quick spot check for bad memory.
120 */
121
122 if (test_all) {
123 for (page = 0; page <= last; page += PAGE_SIZE) {
124 err = iopagetest(mem, offset: page, caller);
125 if (err)
126 return err;
127 }
128 } else {
129 err = iopagetest(mem, offset: 0, caller);
130 if (err)
131 return err;
132
133 err = iopagetest(mem, offset: last, caller);
134 if (err)
135 return err;
136
137 err = iopagetest(mem, offset: random_page(last), caller);
138 if (err)
139 return err;
140 }
141
142 return 0;
143}
144
145struct intel_memory_region *
146intel_memory_region_lookup(struct drm_i915_private *i915,
147 u16 class, u16 instance)
148{
149 struct intel_memory_region *mr;
150 int id;
151
152 /* XXX: consider maybe converting to an rb tree at some point */
153 for_each_memory_region(mr, i915, id) {
154 if (mr->type == class && mr->instance == instance)
155 return mr;
156 }
157
158 return NULL;
159}
160
161struct intel_memory_region *
162intel_memory_region_by_type(struct drm_i915_private *i915,
163 enum intel_memory_type mem_type)
164{
165 struct intel_memory_region *mr;
166 int id;
167
168 for_each_memory_region(mr, i915, id)
169 if (mr->type == mem_type)
170 return mr;
171
172 return NULL;
173}
174
175bool intel_memory_type_is_local(enum intel_memory_type mem_type)
176{
177 switch (mem_type) {
178 case INTEL_MEMORY_LOCAL:
179 case INTEL_MEMORY_STOLEN_LOCAL:
180 return true;
181 default:
182 return false;
183 }
184}
185
186/**
187 * intel_memory_region_reserve - Reserve a memory range
188 * @mem: The region for which we want to reserve a range.
189 * @offset: Start of the range to reserve.
190 * @size: The size of the range to reserve.
191 *
192 * Return: 0 on success, negative error code on failure.
193 */
194int intel_memory_region_reserve(struct intel_memory_region *mem,
195 resource_size_t offset,
196 resource_size_t size)
197{
198 struct ttm_resource_manager *man = mem->region_private;
199
200 GEM_BUG_ON(mem->is_range_manager);
201
202 return i915_ttm_buddy_man_reserve(man, start: offset, size);
203}
204
205void intel_memory_region_debug(struct intel_memory_region *mr,
206 struct drm_printer *printer)
207{
208 drm_printf(p: printer, f: "%s: ", mr->name);
209
210 if (mr->region_private)
211 ttm_resource_manager_debug(man: mr->region_private, p: printer);
212 else
213 drm_printf(p: printer, f: "total:%pa bytes\n", &mr->total);
214}
215
216static int intel_memory_region_memtest(struct intel_memory_region *mem,
217 void *caller)
218{
219 struct drm_i915_private *i915 = mem->i915;
220 int err = 0;
221
222 if (!mem->io.start)
223 return 0;
224
225 if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM) || i915->params.memtest)
226 err = iomemtest(mem, test_all: i915->params.memtest, caller);
227
228 return err;
229}
230
231const char *intel_memory_type_str(enum intel_memory_type type)
232{
233 switch (type) {
234 case INTEL_MEMORY_SYSTEM:
235 return "system";
236 case INTEL_MEMORY_LOCAL:
237 return "local";
238 case INTEL_MEMORY_STOLEN_LOCAL:
239 return "stolen-local";
240 case INTEL_MEMORY_STOLEN_SYSTEM:
241 return "stolen-system";
242 default:
243 return "unknown";
244 }
245}
246
247struct intel_memory_region *
248intel_memory_region_create(struct drm_i915_private *i915,
249 resource_size_t start,
250 resource_size_t size,
251 resource_size_t min_page_size,
252 resource_size_t io_start,
253 resource_size_t io_size,
254 u16 type,
255 u16 instance,
256 const struct intel_memory_region_ops *ops)
257{
258 struct intel_memory_region *mem;
259 int err;
260
261 mem = kzalloc(sizeof(*mem), GFP_KERNEL);
262 if (!mem)
263 return ERR_PTR(error: -ENOMEM);
264
265 mem->i915 = i915;
266 mem->region = DEFINE_RES_MEM(start, size);
267 mem->io = DEFINE_RES_MEM(io_start, io_size);
268 mem->min_page_size = min_page_size;
269 mem->ops = ops;
270 mem->total = size;
271 mem->type = type;
272 mem->instance = instance;
273
274 snprintf(buf: mem->uabi_name, size: sizeof(mem->uabi_name), fmt: "%s%u",
275 intel_memory_type_str(type), instance);
276
277 mutex_init(&mem->objects.lock);
278 INIT_LIST_HEAD(list: &mem->objects.list);
279
280 if (ops->init) {
281 err = ops->init(mem);
282 if (err)
283 goto err_free;
284 }
285
286 err = intel_memory_region_memtest(mem, caller: (void *)_RET_IP_);
287 if (err)
288 goto err_release;
289
290 return mem;
291
292err_release:
293 if (mem->ops->release)
294 mem->ops->release(mem);
295err_free:
296 kfree(objp: mem);
297 return ERR_PTR(error: err);
298}
299
300void intel_memory_region_set_name(struct intel_memory_region *mem,
301 const char *fmt, ...)
302{
303 va_list ap;
304
305 va_start(ap, fmt);
306 vsnprintf(buf: mem->name, size: sizeof(mem->name), fmt, args: ap);
307 va_end(ap);
308}
309
310void intel_memory_region_avail(struct intel_memory_region *mr,
311 u64 *avail, u64 *visible_avail)
312{
313 if (mr->type == INTEL_MEMORY_LOCAL) {
314 i915_ttm_buddy_man_avail(man: mr->region_private,
315 avail, avail_visible: visible_avail);
316 *avail <<= PAGE_SHIFT;
317 *visible_avail <<= PAGE_SHIFT;
318 } else {
319 *avail = mr->total;
320 *visible_avail = mr->total;
321 }
322}
323
324void intel_memory_region_destroy(struct intel_memory_region *mem)
325{
326 int ret = 0;
327
328 if (mem->ops->release)
329 ret = mem->ops->release(mem);
330
331 GEM_WARN_ON(!list_empty_careful(&mem->objects.list));
332 mutex_destroy(lock: &mem->objects.lock);
333 if (!ret)
334 kfree(objp: mem);
335}
336
337/* Global memory region registration -- only slight layer inversions! */
338
339int intel_memory_regions_hw_probe(struct drm_i915_private *i915)
340{
341 int err, i;
342
343 for (i = 0; i < ARRAY_SIZE(i915->mm.regions); i++) {
344 struct intel_memory_region *mem = ERR_PTR(error: -ENODEV);
345 u16 type, instance;
346
347 if (!HAS_REGION(i915, i))
348 continue;
349
350 type = intel_region_map[i].class;
351 instance = intel_region_map[i].instance;
352 switch (type) {
353 case INTEL_MEMORY_SYSTEM:
354 if (IS_DGFX(i915))
355 mem = i915_gem_ttm_system_setup(i915, type,
356 instance);
357 else
358 mem = i915_gem_shmem_setup(i915, type,
359 instance);
360 break;
361 case INTEL_MEMORY_STOLEN_LOCAL:
362 mem = i915_gem_stolen_lmem_setup(i915, type, instance);
363 if (!IS_ERR(ptr: mem))
364 i915->mm.stolen_region = mem;
365 break;
366 case INTEL_MEMORY_STOLEN_SYSTEM:
367 mem = i915_gem_stolen_smem_setup(i915, type, instance);
368 if (!IS_ERR(ptr: mem))
369 i915->mm.stolen_region = mem;
370 break;
371 default:
372 continue;
373 }
374
375 if (IS_ERR(ptr: mem)) {
376 err = PTR_ERR(ptr: mem);
377 drm_err(&i915->drm,
378 "Failed to setup region(%d) type=%d\n",
379 err, type);
380 goto out_cleanup;
381 }
382
383 if (mem) { /* Skip on non-fatal errors */
384 mem->id = i;
385 i915->mm.regions[i] = mem;
386 }
387 }
388
389 for (i = 0; i < ARRAY_SIZE(i915->mm.regions); i++) {
390 struct intel_memory_region *mem = i915->mm.regions[i];
391 u64 region_size, io_size;
392
393 if (!mem)
394 continue;
395
396 region_size = resource_size(res: &mem->region) >> 20;
397 io_size = resource_size(res: &mem->io) >> 20;
398
399 if (resource_size(res: &mem->io))
400 drm_dbg(&i915->drm, "Memory region(%d): %s: %llu MiB %pR, io: %llu MiB %pR\n",
401 mem->id, mem->name, region_size, &mem->region, io_size, &mem->io);
402 else
403 drm_dbg(&i915->drm, "Memory region(%d): %s: %llu MiB %pR, io: n/a\n",
404 mem->id, mem->name, region_size, &mem->region);
405 }
406
407 return 0;
408
409out_cleanup:
410 intel_memory_regions_driver_release(i915);
411 return err;
412}
413
414void intel_memory_regions_driver_release(struct drm_i915_private *i915)
415{
416 int i;
417
418 for (i = 0; i < ARRAY_SIZE(i915->mm.regions); i++) {
419 struct intel_memory_region *region =
420 fetch_and_zero(&i915->mm.regions[i]);
421
422 if (region)
423 intel_memory_region_destroy(mem: region);
424 }
425}
426
427#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
428#include "selftests/intel_memory_region.c"
429#include "selftests/mock_region.c"
430#endif
431

source code of linux/drivers/gpu/drm/i915/intel_memory_region.c