1 /* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-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
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 <linux/export.h>
45 /**********************************************************************/
46 /** \name PCI memory */
50 * \brief Allocate a PCI consistent memory block, for DMA.
52 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
54 drm_dma_handle_t *dmah;
58 /* pci_alloc_consistent only guarantees alignment to the smallest
59 * PAGE_SIZE order which is greater than or equal to the requested size.
60 * Return NULL here for now to make sure nobody tries for larger alignment
65 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
70 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP);
72 if (dmah->vaddr == NULL) {
77 memset(dmah->vaddr, 0, size);
79 /* XXX - Is virt_to_page() legal for consistent mem? */
81 for (addr = (unsigned long)dmah->vaddr, sz = size;
82 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
83 SetPageReserved(virt_to_page((void *)addr));
89 EXPORT_SYMBOL(drm_pci_alloc);
92 * \brief Free a PCI consistent memory block without freeing its descriptor.
94 * This function is for internal use in the Linux-specific DRM core code.
96 void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
102 /* XXX - Is virt_to_page() legal for consistent mem? */
104 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
105 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
106 ClearPageReserved(virt_to_page((void *)addr));
108 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
114 * \brief Free a PCI consistent memory block
116 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
118 __drm_pci_free(dev, dmah);
122 EXPORT_SYMBOL(drm_pci_free);
126 static int drm_get_pci_domain(struct drm_device *dev)
129 /* For historical reasons, drm_get_pci_domain() is busticated
130 * on most archs and has to remain so for userspace interface
131 * < 1.4, except on alpha which was right from the beginning
133 if (dev->if_version < 0x10004)
135 #endif /* __alpha__ */
137 return pci_domain_nr(dev->pdev->bus);
140 static const char *drm_pci_get_name(struct drm_device *dev)
142 struct pci_driver *pdriver = dev->driver->kdriver.pci;
143 return pdriver->name;
146 static int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
149 master->unique_len = 40;
150 master->unique_size = master->unique_len;
151 master->unique = kmalloc(master->unique_size, GFP_KERNEL);
152 if (master->unique == NULL)
156 len = snprintf(master->unique, master->unique_len,
157 "pci:%04x:%02x:%02x.%d",
158 drm_get_pci_domain(dev),
159 dev->pdev->bus->number,
160 PCI_SLOT(dev->pdev->devfn),
161 PCI_FUNC(dev->pdev->devfn));
163 if (len >= master->unique_len) {
164 DRM_ERROR("buffer overflow");
168 master->unique_len = len;
175 int drm_pci_set_unique(struct drm_device *dev,
176 struct drm_master *master,
177 struct drm_unique *u)
179 int domain, bus, slot, func, ret;
181 master->unique_len = u->unique_len;
182 master->unique_size = u->unique_len + 1;
183 master->unique = kmalloc(master->unique_size, GFP_KERNEL);
184 if (!master->unique) {
189 if (copy_from_user(master->unique, u->unique, master->unique_len)) {
194 master->unique[master->unique_len] = '\0';
196 /* Return error if the busid submitted doesn't match the device's actual
199 ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
208 if ((domain != drm_get_pci_domain(dev)) ||
209 (bus != dev->pdev->bus->number) ||
210 (slot != PCI_SLOT(dev->pdev->devfn)) ||
211 (func != PCI_FUNC(dev->pdev->devfn))) {
220 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
222 if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
223 (p->busnum & 0xff) != dev->pdev->bus->number ||
224 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
227 p->irq = dev->pdev->irq;
229 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
235 * Get interrupt from bus id.
237 * \param inode device inode.
238 * \param file_priv DRM file private.
239 * \param cmd command.
240 * \param arg user argument, pointing to a drm_irq_busid structure.
241 * \return zero on success or a negative number on failure.
243 * Finds the PCI device with the specified bus id and gets its IRQ number.
244 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
245 * to that of the device that this DRM instance attached to.
247 int drm_irq_by_busid(struct drm_device *dev, void *data,
248 struct drm_file *file_priv)
250 struct drm_irq_busid *p = data;
252 if (drm_core_check_feature(dev, DRIVER_MODESET))
255 /* UMS was only ever support on PCI devices. */
256 if (WARN_ON(!dev->pdev))
259 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
262 return drm_pci_irq_by_busid(dev, p);
265 static void drm_pci_agp_init(struct drm_device *dev)
267 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
268 if (drm_pci_device_is_agp(dev))
269 dev->agp = drm_agp_init(dev);
271 dev->agp->agp_mtrr = arch_phys_wc_add(
272 dev->agp->agp_info.aper_base,
273 dev->agp->agp_info.aper_size *
279 void drm_pci_agp_destroy(struct drm_device *dev)
282 arch_phys_wc_del(dev->agp->agp_mtrr);
289 static struct drm_bus drm_pci_bus = {
290 .get_name = drm_pci_get_name,
291 .set_busid = drm_pci_set_busid,
297 * \param pdev - PCI device structure
298 * \param ent entry from the PCI ID table with device type flags
299 * \return zero on success or a negative number on failure.
301 * Attempt to gets inter module "drm" information. If we are first
302 * then register the character device and inter module information.
303 * Try and register, if we fail to register, backout previous work.
305 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
306 struct drm_driver *driver)
308 struct drm_device *dev;
313 dev = drm_dev_alloc(driver, &pdev->dev);
317 ret = pci_enable_device(pdev);
323 dev->hose = pdev->sysdata;
326 if (drm_core_check_feature(dev, DRIVER_MODESET))
327 pci_set_drvdata(pdev, dev);
329 drm_pci_agp_init(dev);
331 ret = drm_dev_register(dev, ent->driver_data);
335 DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
336 driver->name, driver->major, driver->minor, driver->patchlevel,
337 driver->date, pci_name(pdev), dev->primary->index);
339 /* No locking needed since shadow-attach is single-threaded since it may
340 * only be called from the per-driver module init hook. */
341 if (!drm_core_check_feature(dev, DRIVER_MODESET))
342 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
347 drm_pci_agp_destroy(dev);
348 pci_disable_device(pdev);
353 EXPORT_SYMBOL(drm_get_pci_dev);
356 * PCI device initialization. Called direct from modules at load time.
358 * \return zero on success or a negative number on failure.
360 * Initializes a drm_device structures,registering the
361 * stubs and initializing the AGP device.
363 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
364 * after the initialization for driver customization.
366 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
368 struct pci_dev *pdev = NULL;
369 const struct pci_device_id *pid;
374 driver->kdriver.pci = pdriver;
375 driver->bus = &drm_pci_bus;
377 if (driver->driver_features & DRIVER_MODESET)
378 return pci_register_driver(pdriver);
380 /* If not using KMS, fall back to stealth mode manual scanning. */
381 INIT_LIST_HEAD(&driver->legacy_dev_list);
382 for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
383 pid = &pdriver->id_table[i];
385 /* Loop around setting up a DRM device for each PCI device
386 * matching our ID and device class. If we had the internal
387 * function that pci_get_subsys and pci_get_class used, we'd
388 * be able to just pass pid in instead of doing a two-stage
393 pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
394 pid->subdevice, pdev)) != NULL) {
395 if ((pdev->class & pid->class_mask) != pid->class)
398 /* stealth mode requires a manual probe */
400 drm_get_pci_dev(pdev, pid, driver);
406 int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask)
408 struct pci_dev *root;
415 root = dev->pdev->bus->self;
417 /* we've been informed via and serverworks don't make the cut */
418 if (root->vendor == PCI_VENDOR_ID_VIA ||
419 root->vendor == PCI_VENDOR_ID_SERVERWORKS)
422 pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap);
423 pcie_capability_read_dword(root, PCI_EXP_LNKCAP2, &lnkcap2);
425 if (lnkcap2) { /* PCIe r3.0-compliant */
426 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB)
427 *mask |= DRM_PCIE_SPEED_25;
428 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB)
429 *mask |= DRM_PCIE_SPEED_50;
430 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB)
431 *mask |= DRM_PCIE_SPEED_80;
432 } else { /* pre-r3.0 */
433 if (lnkcap & PCI_EXP_LNKCAP_SLS_2_5GB)
434 *mask |= DRM_PCIE_SPEED_25;
435 if (lnkcap & PCI_EXP_LNKCAP_SLS_5_0GB)
436 *mask |= (DRM_PCIE_SPEED_25 | DRM_PCIE_SPEED_50);
439 DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2);
442 EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask);
446 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
451 void drm_pci_agp_destroy(struct drm_device *dev) {}
453 int drm_irq_by_busid(struct drm_device *dev, void *data,
454 struct drm_file *file_priv)
459 int drm_pci_set_unique(struct drm_device *dev,
460 struct drm_master *master,
461 struct drm_unique *u)
467 EXPORT_SYMBOL(drm_pci_init);
470 void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
472 struct drm_device *dev, *tmp;
475 if (driver->driver_features & DRIVER_MODESET) {
476 pci_unregister_driver(pdriver);
478 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list,
480 list_del(&dev->legacy_dev_list);
484 DRM_INFO("Module unloaded\n");
486 EXPORT_SYMBOL(drm_pci_exit);