1 /* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-c -*- */
2 /**
3 * \file drm_pci.c
4 * \brief Functions and ioctls to manage PCI memory
5 *
6 * \warning These interfaces aren't stable yet.
7 *
8 * \todo Implement the remaining ioctl's for the PCI pools.
9 * \todo The wrappers here are so thin that they would be better off inlined..
10 *
11 * \author José Fonseca <jrfonseca@tungstengraphics.com>
12 * \author Leif Delgass <ldelgass@retinalburn.net>
13 */
14
15 /*
16 * Copyright 2003 José Fonseca.
17 * Copyright 2003 Leif Delgass.
18 * All Rights Reserved.
19 *
20 * Permission is hereby granted, free of charge, to any person obtaining a
21 * copy of this software and associated documentation files (the "Software"),
22 * to deal in the Software without restriction, including without limitation
23 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
24 * and/or sell copies of the Software, and to permit persons to whom the
25 * Software is furnished to do so, subject to the following conditions:
26 *
27 * The above copyright notice and this permission notice (including the next
28 * paragraph) shall be included in all copies or substantial portions of the
29 * Software.
30 *
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
32 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
33 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
34 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
35 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
36 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
37 */
38
39 #include <sys/cdefs.h>
40 #include <dev/drm2/drmP.h>
41
42 static int drm_msi = 1; /* Enable by default. */
43 SYSCTL_NODE(_hw, OID_AUTO, drm, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
44 "DRM device");
45 SYSCTL_INT(_hw_drm, OID_AUTO, msi, CTLFLAG_RDTUN, &drm_msi, 1,
46 "Enable MSI interrupts for drm devices");
47
48 /**********************************************************************/
49 /** \name PCI memory */
50 /*@{*/
51
52 static void
drm_pci_busdma_callback(void * arg,bus_dma_segment_t * segs,int nsegs,int error)53 drm_pci_busdma_callback(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
54 {
55 drm_dma_handle_t *dmah = arg;
56
57 if (error != 0)
58 return;
59
60 KASSERT(nsegs == 1, ("drm_pci_busdma_callback: bad dma segment count"));
61 dmah->busaddr = segs[0].ds_addr;
62 }
63
64 /**
65 * \brief Allocate a PCI consistent memory block, for DMA.
66 */
drm_pci_alloc(struct drm_device * dev,size_t size,size_t align,dma_addr_t maxaddr)67 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size,
68 size_t align, dma_addr_t maxaddr)
69 {
70 drm_dma_handle_t *dmah;
71 int ret;
72
73 /* Need power-of-two alignment, so fail the allocation if it isn't. */
74 if ((align & (align - 1)) != 0) {
75 DRM_ERROR("drm_pci_alloc with non-power-of-two alignment %d\n",
76 (int)align);
77 return NULL;
78 }
79
80 dmah = malloc(sizeof(drm_dma_handle_t), DRM_MEM_DMA, M_ZERO | M_NOWAIT);
81 if (dmah == NULL)
82 return NULL;
83
84 /* Make sure we aren't holding mutexes here */
85 mtx_assert(&dev->dma_lock, MA_NOTOWNED);
86 if (mtx_owned(&dev->dma_lock))
87 DRM_ERROR("called while holding dma_lock\n");
88
89 ret = bus_dma_tag_create(
90 bus_get_dma_tag(dev->dev), /* parent */
91 align, 0, /* align, boundary */
92 maxaddr, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */
93 NULL, NULL, /* filtfunc, filtfuncargs */
94 size, 1, size, /* maxsize, nsegs, maxsegsize */
95 0, NULL, NULL, /* flags, lockfunc, lockfuncargs */
96 &dmah->tag);
97 if (ret != 0) {
98 free(dmah, DRM_MEM_DMA);
99 return NULL;
100 }
101
102 ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr,
103 BUS_DMA_WAITOK | BUS_DMA_ZERO | BUS_DMA_NOCACHE, &dmah->map);
104 if (ret != 0) {
105 bus_dma_tag_destroy(dmah->tag);
106 free(dmah, DRM_MEM_DMA);
107 return NULL;
108 }
109
110 ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr, size,
111 drm_pci_busdma_callback, dmah, BUS_DMA_NOWAIT);
112 if (ret != 0) {
113 bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
114 bus_dma_tag_destroy(dmah->tag);
115 free(dmah, DRM_MEM_DMA);
116 return NULL;
117 }
118
119 return dmah;
120 }
121
122 EXPORT_SYMBOL(drm_pci_alloc);
123
124 /**
125 * \brief Free a PCI consistent memory block without freeing its descriptor.
126 *
127 * This function is for internal use in the Linux-specific DRM core code.
128 */
__drm_pci_free(struct drm_device * dev,drm_dma_handle_t * dmah)129 void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
130 {
131 if (dmah == NULL)
132 return;
133
134 bus_dmamap_unload(dmah->tag, dmah->map);
135 bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
136 bus_dma_tag_destroy(dmah->tag);
137 }
138
139 /**
140 * \brief Free a PCI consistent memory block
141 */
drm_pci_free(struct drm_device * dev,drm_dma_handle_t * dmah)142 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
143 {
144 __drm_pci_free(dev, dmah);
145 free(dmah, DRM_MEM_DMA);
146 }
147
148 EXPORT_SYMBOL(drm_pci_free);
149
drm_get_pci_domain(struct drm_device * dev)150 static int drm_get_pci_domain(struct drm_device *dev)
151 {
152 return dev->pci_domain;
153 }
154
drm_pci_get_irq(struct drm_device * dev)155 static int drm_pci_get_irq(struct drm_device *dev)
156 {
157
158 if (dev->irqr)
159 return (dev->irq);
160
161 dev->irqr = bus_alloc_resource_any(dev->dev, SYS_RES_IRQ,
162 &dev->irqrid, RF_SHAREABLE);
163 if (!dev->irqr) {
164 dev_err(dev->dev, "Failed to allocate IRQ\n");
165 return (0);
166 }
167
168 dev->irq = (int) rman_get_start(dev->irqr);
169
170 return (dev->irq);
171 }
172
drm_pci_free_irq(struct drm_device * dev)173 static void drm_pci_free_irq(struct drm_device *dev)
174 {
175 if (dev->irqr == NULL)
176 return;
177
178 bus_release_resource(dev->dev, SYS_RES_IRQ,
179 dev->irqrid, dev->irqr);
180
181 dev->irqr = NULL;
182 dev->irq = 0;
183 }
184
drm_pci_get_name(struct drm_device * dev)185 static const char *drm_pci_get_name(struct drm_device *dev)
186 {
187 return dev->driver->name;
188 }
189
drm_pci_set_busid(struct drm_device * dev,struct drm_master * master)190 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
191 {
192 int len, ret;
193 master->unique_len = 40;
194 master->unique_size = master->unique_len;
195 master->unique = malloc(master->unique_size, DRM_MEM_DRIVER, M_NOWAIT);
196 if (master->unique == NULL)
197 return -ENOMEM;
198
199
200 len = snprintf(master->unique, master->unique_len,
201 "pci:%04x:%02x:%02x.%d",
202 dev->pci_domain,
203 dev->pci_bus,
204 dev->pci_slot,
205 dev->pci_func);
206
207 if (len >= master->unique_len) {
208 DRM_ERROR("buffer overflow");
209 ret = -EINVAL;
210 goto err;
211 } else
212 master->unique_len = len;
213
214 return 0;
215 err:
216 return ret;
217 }
218
drm_pci_set_unique(struct drm_device * dev,struct drm_master * master,struct drm_unique * u)219 int drm_pci_set_unique(struct drm_device *dev,
220 struct drm_master *master,
221 struct drm_unique *u)
222 {
223 int domain, bus, slot, func, ret;
224
225 master->unique_len = u->unique_len;
226 master->unique_size = u->unique_len + 1;
227 master->unique = malloc(master->unique_size, DRM_MEM_DRIVER, M_WAITOK);
228 if (!master->unique) {
229 ret = -ENOMEM;
230 goto err;
231 }
232
233 if (copy_from_user(master->unique, u->unique, master->unique_len)) {
234 ret = -EFAULT;
235 goto err;
236 }
237
238 master->unique[master->unique_len] = '\0';
239
240 /* Return error if the busid submitted doesn't match the device's actual
241 * busid.
242 */
243 ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
244 if (ret != 3) {
245 ret = -EINVAL;
246 goto err;
247 }
248
249 domain = bus >> 8;
250 bus &= 0xff;
251
252 if ((domain != dev->pci_domain) ||
253 (bus != dev->pci_bus) ||
254 (slot != dev->pci_slot) ||
255 (func != dev->pci_func)) {
256 ret = -EINVAL;
257 goto err;
258 }
259 return 0;
260 err:
261 return ret;
262 }
263
264
drm_pci_irq_by_busid(struct drm_device * dev,struct drm_irq_busid * p)265 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
266 {
267 if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
268 (p->busnum & 0xff) != dev->pci_bus ||
269 p->devnum != dev->pci_slot || p->funcnum != dev->pci_func)
270 return -EINVAL;
271
272 p->irq = dev->irq;
273
274 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
275 p->irq);
276 return 0;
277 }
278
drm_pci_agp_init(struct drm_device * dev)279 int drm_pci_agp_init(struct drm_device *dev)
280 {
281 if (drm_core_has_AGP(dev)) {
282 if (drm_pci_device_is_agp(dev))
283 dev->agp = drm_agp_init(dev);
284 if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
285 && (dev->agp == NULL)) {
286 DRM_ERROR("Cannot initialize the agpgart module.\n");
287 return -EINVAL;
288 }
289 if (drm_core_has_MTRR(dev)) {
290 if (dev->agp && dev->agp->agp_info.ai_aperture_base != 0) {
291 if (drm_mtrr_add(dev->agp->agp_info.ai_aperture_base,
292 dev->agp->agp_info.ai_aperture_size, DRM_MTRR_WC) == 0)
293 dev->agp->agp_mtrr = 1;
294 else
295 dev->agp->agp_mtrr = -1;
296 }
297 }
298 }
299 return 0;
300 }
301
302 static struct drm_bus drm_pci_bus = {
303 .bus_type = DRIVER_BUS_PCI,
304 .get_irq = drm_pci_get_irq,
305 .free_irq = drm_pci_free_irq,
306 .get_name = drm_pci_get_name,
307 .set_busid = drm_pci_set_busid,
308 .set_unique = drm_pci_set_unique,
309 .irq_by_busid = drm_pci_irq_by_busid,
310 .agp_init = drm_pci_agp_init,
311 };
312
313 /**
314 * Register.
315 *
316 * \param pdev - PCI device structure
317 * \param ent entry from the PCI ID table with device type flags
318 * \return zero on success or a negative number on failure.
319 *
320 * Attempt to gets inter module "drm" information. If we are first
321 * then register the character device and inter module information.
322 * Try and register, if we fail to register, backout previous work.
323 */
drm_get_pci_dev(device_t kdev,struct drm_device * dev,struct drm_driver * driver)324 int drm_get_pci_dev(device_t kdev, struct drm_device *dev,
325 struct drm_driver *driver)
326 {
327 int ret;
328
329 DRM_DEBUG("\n");
330
331 driver->bus = &drm_pci_bus;
332
333 dev->dev = kdev;
334
335 dev->pci_domain = pci_get_domain(dev->dev);
336 dev->pci_bus = pci_get_bus(dev->dev);
337 dev->pci_slot = pci_get_slot(dev->dev);
338 dev->pci_func = pci_get_function(dev->dev);
339
340 dev->pci_vendor = pci_get_vendor(dev->dev);
341 dev->pci_device = pci_get_device(dev->dev);
342 dev->pci_subvendor = pci_get_subvendor(dev->dev);
343 dev->pci_subdevice = pci_get_subdevice(dev->dev);
344
345 sx_xlock(&drm_global_mutex);
346
347 if ((ret = drm_fill_in_dev(dev, driver))) {
348 DRM_ERROR("Failed to fill in dev: %d\n", ret);
349 goto err_g1;
350 }
351
352 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
353 ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
354 if (ret)
355 goto err_g2;
356 }
357
358 if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
359 goto err_g3;
360
361 if (dev->driver->load) {
362 ret = dev->driver->load(dev,
363 dev->id_entry->driver_private);
364 if (ret)
365 goto err_g4;
366 }
367
368 /* setup the grouping for the legacy output */
369 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
370 ret = drm_mode_group_init_legacy_group(dev,
371 &dev->primary->mode_group);
372 if (ret)
373 goto err_g5;
374 }
375
376 #ifdef FREEBSD_NOTYET
377 list_add_tail(&dev->driver_item, &driver->device_list);
378 #endif /* FREEBSD_NOTYET */
379
380 DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
381 driver->name, driver->major, driver->minor, driver->patchlevel,
382 driver->date, device_get_nameunit(dev->dev), dev->primary->index);
383
384 sx_xunlock(&drm_global_mutex);
385 return 0;
386
387 err_g5:
388 if (dev->driver->unload)
389 dev->driver->unload(dev);
390 err_g4:
391 drm_put_minor(&dev->primary);
392 err_g3:
393 if (drm_core_check_feature(dev, DRIVER_MODESET))
394 drm_put_minor(&dev->control);
395 err_g2:
396 drm_cancel_fill_in_dev(dev);
397 err_g1:
398 sx_xunlock(&drm_global_mutex);
399 return ret;
400 }
401 EXPORT_SYMBOL(drm_get_pci_dev);
402
403 int
drm_pci_enable_msi(struct drm_device * dev)404 drm_pci_enable_msi(struct drm_device *dev)
405 {
406 int msicount, ret;
407
408 if (!drm_msi)
409 return (-ENOENT);
410
411 msicount = pci_msi_count(dev->dev);
412 DRM_DEBUG("MSI count = %d\n", msicount);
413 if (msicount > 1)
414 msicount = 1;
415
416 ret = pci_alloc_msi(dev->dev, &msicount);
417 if (ret == 0) {
418 DRM_INFO("MSI enabled %d message(s)\n", msicount);
419 dev->msi_enabled = 1;
420 dev->irqrid = 1;
421 }
422
423 return (-ret);
424 }
425
426 void
drm_pci_disable_msi(struct drm_device * dev)427 drm_pci_disable_msi(struct drm_device *dev)
428 {
429
430 if (!dev->msi_enabled)
431 return;
432
433 pci_release_msi(dev->dev);
434 dev->msi_enabled = 0;
435 dev->irqrid = 0;
436 }
437
drm_pcie_get_speed_cap_mask(struct drm_device * dev,u32 * mask)438 int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask)
439 {
440 device_t root;
441 int pos;
442 u32 lnkcap = 0, lnkcap2 = 0;
443
444 *mask = 0;
445 if (!drm_pci_device_is_pcie(dev))
446 return -EINVAL;
447
448 root =
449 device_get_parent( /* pcib */
450 device_get_parent( /* `-- pci */
451 device_get_parent( /* `-- vgapci */
452 dev->dev))); /* `-- drmn */
453
454 pos = 0;
455 pci_find_cap(root, PCIY_EXPRESS, &pos);
456 if (!pos)
457 return -EINVAL;
458
459 /* we've been informed via and serverworks don't make the cut */
460 if (pci_get_vendor(root) == PCI_VENDOR_ID_VIA ||
461 pci_get_vendor(root) == PCI_VENDOR_ID_SERVERWORKS)
462 return -EINVAL;
463
464 lnkcap = pci_read_config(root, pos + PCIER_LINK_CAP, 4);
465 lnkcap2 = pci_read_config(root, pos + PCIER_LINK_CAP2, 4);
466
467 lnkcap &= PCIEM_LINK_CAP_MAX_SPEED;
468 lnkcap2 &= 0xfe;
469
470 #define PCI_EXP_LNKCAP2_SLS_2_5GB 0x02 /* Supported Link Speed 2.5GT/s */
471 #define PCI_EXP_LNKCAP2_SLS_5_0GB 0x04 /* Supported Link Speed 5.0GT/s */
472 #define PCI_EXP_LNKCAP2_SLS_8_0GB 0x08 /* Supported Link Speed 8.0GT/s */
473
474 if (lnkcap2) { /* PCIE GEN 3.0 */
475 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB)
476 *mask |= DRM_PCIE_SPEED_25;
477 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB)
478 *mask |= DRM_PCIE_SPEED_50;
479 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB)
480 *mask |= DRM_PCIE_SPEED_80;
481 } else {
482 if (lnkcap & 1)
483 *mask |= DRM_PCIE_SPEED_25;
484 if (lnkcap & 2)
485 *mask |= DRM_PCIE_SPEED_50;
486 }
487
488 DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", pci_get_vendor(root), pci_get_device(root), lnkcap, lnkcap2);
489 return 0;
490 }
491 EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask);
492