[S390] Remove error checking from copy_oldmem_page()
[linux/fpc-iii.git] / drivers / gpu / drm / drm_pci.c
blobb6a19cb07cafc3591f2ff946532851f63a14270d
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
6 * \warning These interfaces aren't stable yet.
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..
11 * \author José Fonseca <jrfonseca@tungstengraphics.com>
12 * \author Leif Delgass <ldelgass@retinalburn.net>
16 * Copyright 2003 José Fonseca.
17 * Copyright 2003 Leif Delgass.
18 * All Rights Reserved.
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:
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.
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.
39 #include <linux/pci.h>
40 #include <linux/slab.h>
41 #include <linux/dma-mapping.h>
42 #include "drmP.h"
44 /**********************************************************************/
45 /** \name PCI memory */
46 /*@{*/
48 /**
49 * \brief Allocate a PCI consistent memory block, for DMA.
51 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
53 drm_dma_handle_t *dmah;
54 #if 1
55 unsigned long addr;
56 size_t sz;
57 #endif
59 /* pci_alloc_consistent only guarantees alignment to the smallest
60 * PAGE_SIZE order which is greater than or equal to the requested size.
61 * Return NULL here for now to make sure nobody tries for larger alignment
63 if (align > size)
64 return NULL;
66 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
67 if (!dmah)
68 return NULL;
70 dmah->size = size;
71 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP);
73 if (dmah->vaddr == NULL) {
74 kfree(dmah);
75 return NULL;
78 memset(dmah->vaddr, 0, size);
80 /* XXX - Is virt_to_page() legal for consistent mem? */
81 /* Reserve */
82 for (addr = (unsigned long)dmah->vaddr, sz = size;
83 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
84 SetPageReserved(virt_to_page(addr));
87 return dmah;
90 EXPORT_SYMBOL(drm_pci_alloc);
92 /**
93 * \brief Free a PCI consistent memory block without freeing its descriptor.
95 * This function is for internal use in the Linux-specific DRM core code.
97 void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
99 #if 1
100 unsigned long addr;
101 size_t sz;
102 #endif
104 if (dmah->vaddr) {
105 /* XXX - Is virt_to_page() legal for consistent mem? */
106 /* Unreserve */
107 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
108 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
109 ClearPageReserved(virt_to_page(addr));
111 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
112 dmah->busaddr);
117 * \brief Free a PCI consistent memory block
119 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
121 __drm_pci_free(dev, dmah);
122 kfree(dmah);
125 EXPORT_SYMBOL(drm_pci_free);
127 #ifdef CONFIG_PCI
129 static int drm_get_pci_domain(struct drm_device *dev)
131 #ifndef __alpha__
132 /* For historical reasons, drm_get_pci_domain() is busticated
133 * on most archs and has to remain so for userspace interface
134 * < 1.4, except on alpha which was right from the beginning
136 if (dev->if_version < 0x10004)
137 return 0;
138 #endif /* __alpha__ */
140 return pci_domain_nr(dev->pdev->bus);
143 static int drm_pci_get_irq(struct drm_device *dev)
145 return dev->pdev->irq;
148 static const char *drm_pci_get_name(struct drm_device *dev)
150 struct pci_driver *pdriver = dev->driver->kdriver.pci;
151 return pdriver->name;
154 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
156 int len, ret;
157 struct pci_driver *pdriver = dev->driver->kdriver.pci;
158 master->unique_len = 40;
159 master->unique_size = master->unique_len;
160 master->unique = kmalloc(master->unique_size, GFP_KERNEL);
161 if (master->unique == NULL)
162 return -ENOMEM;
165 len = snprintf(master->unique, master->unique_len,
166 "pci:%04x:%02x:%02x.%d",
167 drm_get_pci_domain(dev),
168 dev->pdev->bus->number,
169 PCI_SLOT(dev->pdev->devfn),
170 PCI_FUNC(dev->pdev->devfn));
172 if (len >= master->unique_len) {
173 DRM_ERROR("buffer overflow");
174 ret = -EINVAL;
175 goto err;
176 } else
177 master->unique_len = len;
179 dev->devname =
180 kmalloc(strlen(pdriver->name) +
181 master->unique_len + 2, GFP_KERNEL);
183 if (dev->devname == NULL) {
184 ret = -ENOMEM;
185 goto err;
188 sprintf(dev->devname, "%s@%s", pdriver->name,
189 master->unique);
191 return 0;
192 err:
193 return ret;
196 int drm_pci_set_unique(struct drm_device *dev,
197 struct drm_master *master,
198 struct drm_unique *u)
200 int domain, bus, slot, func, ret;
201 const char *bus_name;
203 master->unique_len = u->unique_len;
204 master->unique_size = u->unique_len + 1;
205 master->unique = kmalloc(master->unique_size, GFP_KERNEL);
206 if (!master->unique) {
207 ret = -ENOMEM;
208 goto err;
211 if (copy_from_user(master->unique, u->unique, master->unique_len)) {
212 ret = -EFAULT;
213 goto err;
216 master->unique[master->unique_len] = '\0';
218 bus_name = dev->driver->bus->get_name(dev);
219 dev->devname = kmalloc(strlen(bus_name) +
220 strlen(master->unique) + 2, GFP_KERNEL);
221 if (!dev->devname) {
222 ret = -ENOMEM;
223 goto err;
226 sprintf(dev->devname, "%s@%s", bus_name,
227 master->unique);
229 /* Return error if the busid submitted doesn't match the device's actual
230 * busid.
232 ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
233 if (ret != 3) {
234 ret = -EINVAL;
235 goto err;
238 domain = bus >> 8;
239 bus &= 0xff;
241 if ((domain != drm_get_pci_domain(dev)) ||
242 (bus != dev->pdev->bus->number) ||
243 (slot != PCI_SLOT(dev->pdev->devfn)) ||
244 (func != PCI_FUNC(dev->pdev->devfn))) {
245 ret = -EINVAL;
246 goto err;
248 return 0;
249 err:
250 return ret;
254 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
256 if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
257 (p->busnum & 0xff) != dev->pdev->bus->number ||
258 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
259 return -EINVAL;
261 p->irq = dev->pdev->irq;
263 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
264 p->irq);
265 return 0;
268 int drm_pci_agp_init(struct drm_device *dev)
270 if (drm_core_has_AGP(dev)) {
271 if (drm_pci_device_is_agp(dev))
272 dev->agp = drm_agp_init(dev);
273 if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
274 && (dev->agp == NULL)) {
275 DRM_ERROR("Cannot initialize the agpgart module.\n");
276 return -EINVAL;
278 if (drm_core_has_MTRR(dev)) {
279 if (dev->agp)
280 dev->agp->agp_mtrr =
281 mtrr_add(dev->agp->agp_info.aper_base,
282 dev->agp->agp_info.aper_size *
283 1024 * 1024, MTRR_TYPE_WRCOMB, 1);
286 return 0;
289 static struct drm_bus drm_pci_bus = {
290 .bus_type = DRIVER_BUS_PCI,
291 .get_irq = drm_pci_get_irq,
292 .get_name = drm_pci_get_name,
293 .set_busid = drm_pci_set_busid,
294 .set_unique = drm_pci_set_unique,
295 .irq_by_busid = drm_pci_irq_by_busid,
296 .agp_init = drm_pci_agp_init,
300 * Register.
302 * \param pdev - PCI device structure
303 * \param ent entry from the PCI ID table with device type flags
304 * \return zero on success or a negative number on failure.
306 * Attempt to gets inter module "drm" information. If we are first
307 * then register the character device and inter module information.
308 * Try and register, if we fail to register, backout previous work.
310 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
311 struct drm_driver *driver)
313 struct drm_device *dev;
314 int ret;
316 DRM_DEBUG("\n");
318 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
319 if (!dev)
320 return -ENOMEM;
322 ret = pci_enable_device(pdev);
323 if (ret)
324 goto err_g1;
326 pci_set_master(pdev);
328 dev->pdev = pdev;
329 dev->dev = &pdev->dev;
331 dev->pci_device = pdev->device;
332 dev->pci_vendor = pdev->vendor;
334 #ifdef __alpha__
335 dev->hose = pdev->sysdata;
336 #endif
338 mutex_lock(&drm_global_mutex);
340 if ((ret = drm_fill_in_dev(dev, ent, driver))) {
341 printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
342 goto err_g2;
345 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
346 pci_set_drvdata(pdev, dev);
347 ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
348 if (ret)
349 goto err_g2;
352 if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
353 goto err_g3;
355 if (dev->driver->load) {
356 ret = dev->driver->load(dev, ent->driver_data);
357 if (ret)
358 goto err_g4;
361 /* setup the grouping for the legacy output */
362 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
363 ret = drm_mode_group_init_legacy_group(dev,
364 &dev->primary->mode_group);
365 if (ret)
366 goto err_g4;
369 list_add_tail(&dev->driver_item, &driver->device_list);
371 DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
372 driver->name, driver->major, driver->minor, driver->patchlevel,
373 driver->date, pci_name(pdev), dev->primary->index);
375 mutex_unlock(&drm_global_mutex);
376 return 0;
378 err_g4:
379 drm_put_minor(&dev->primary);
380 err_g3:
381 if (drm_core_check_feature(dev, DRIVER_MODESET))
382 drm_put_minor(&dev->control);
383 err_g2:
384 pci_disable_device(pdev);
385 err_g1:
386 kfree(dev);
387 mutex_unlock(&drm_global_mutex);
388 return ret;
390 EXPORT_SYMBOL(drm_get_pci_dev);
393 * PCI device initialization. Called direct from modules at load time.
395 * \return zero on success or a negative number on failure.
397 * Initializes a drm_device structures,registering the
398 * stubs and initializing the AGP device.
400 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
401 * after the initialization for driver customization.
403 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
405 struct pci_dev *pdev = NULL;
406 const struct pci_device_id *pid;
407 int i;
409 DRM_DEBUG("\n");
411 INIT_LIST_HEAD(&driver->device_list);
412 driver->kdriver.pci = pdriver;
413 driver->bus = &drm_pci_bus;
415 if (driver->driver_features & DRIVER_MODESET)
416 return pci_register_driver(pdriver);
418 /* If not using KMS, fall back to stealth mode manual scanning. */
419 for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
420 pid = &pdriver->id_table[i];
422 /* Loop around setting up a DRM device for each PCI device
423 * matching our ID and device class. If we had the internal
424 * function that pci_get_subsys and pci_get_class used, we'd
425 * be able to just pass pid in instead of doing a two-stage
426 * thing.
428 pdev = NULL;
429 while ((pdev =
430 pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
431 pid->subdevice, pdev)) != NULL) {
432 if ((pdev->class & pid->class_mask) != pid->class)
433 continue;
435 /* stealth mode requires a manual probe */
436 pci_dev_get(pdev);
437 drm_get_pci_dev(pdev, pid, driver);
440 return 0;
443 #else
445 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
447 return -1;
450 #endif
452 EXPORT_SYMBOL(drm_pci_init);
454 /*@}*/
455 void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
457 struct drm_device *dev, *tmp;
458 DRM_DEBUG("\n");
460 if (driver->driver_features & DRIVER_MODESET) {
461 pci_unregister_driver(pdriver);
462 } else {
463 list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
464 drm_put_dev(dev);
466 DRM_INFO("Module unloaded\n");
468 EXPORT_SYMBOL(drm_pci_exit);