2 * Copyright 2003 José Fonseca.
3 * Copyright 2003 Leif Delgass.
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:
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
21 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 #include <linux/pci.h>
26 #include <linux/slab.h>
27 #include <linux/dma-mapping.h>
28 #include <linux/export.h>
29 #include <drm/drm_pci.h>
31 #include "drm_internal.h"
32 #include "drm_legacy.h"
35 * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA.
37 * @size: size of block to allocate
38 * @align: alignment of block
40 * FIXME: This is a needless abstraction of the Linux dma-api and should be
43 * Return: A handle to the allocated memory block on success or NULL on
46 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
48 drm_dma_handle_t *dmah;
52 /* pci_alloc_consistent only guarantees alignment to the smallest
53 * PAGE_SIZE order which is greater than or equal to the requested size.
54 * Return NULL here for now to make sure nobody tries for larger alignment
59 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
64 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP);
66 if (dmah->vaddr == NULL) {
71 memset(dmah->vaddr, 0, size);
73 /* XXX - Is virt_to_page() legal for consistent mem? */
75 for (addr = (unsigned long)dmah->vaddr, sz = size;
76 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
77 SetPageReserved(virt_to_page((void *)addr));
83 EXPORT_SYMBOL(drm_pci_alloc);
86 * Free a PCI consistent memory block without freeing its descriptor.
88 * This function is for internal use in the Linux-specific DRM core code.
90 void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
96 /* XXX - Is virt_to_page() legal for consistent mem? */
98 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
99 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
100 ClearPageReserved(virt_to_page((void *)addr));
102 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
108 * drm_pci_free - Free a PCI consistent memory block
110 * @dmah: handle to memory block
112 * FIXME: This is a needless abstraction of the Linux dma-api and should be
115 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
117 __drm_legacy_pci_free(dev, dmah);
121 EXPORT_SYMBOL(drm_pci_free);
125 static int drm_get_pci_domain(struct drm_device *dev)
128 /* For historical reasons, drm_get_pci_domain() is busticated
129 * on most archs and has to remain so for userspace interface
130 * < 1.4, except on alpha which was right from the beginning
132 if (dev->if_version < 0x10004)
134 #endif /* __alpha__ */
136 return pci_domain_nr(dev->pdev->bus);
139 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
141 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d",
142 drm_get_pci_domain(dev),
143 dev->pdev->bus->number,
144 PCI_SLOT(dev->pdev->devfn),
145 PCI_FUNC(dev->pdev->devfn));
149 master->unique_len = strlen(master->unique);
152 EXPORT_SYMBOL(drm_pci_set_busid);
154 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
156 if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
157 (p->busnum & 0xff) != dev->pdev->bus->number ||
158 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
161 p->irq = dev->pdev->irq;
163 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
169 * drm_irq_by_busid - Get interrupt from bus ID
171 * @data: IOCTL parameter pointing to a drm_irq_busid structure
172 * @file_priv: DRM file private.
174 * Finds the PCI device with the specified bus id and gets its IRQ number.
175 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
176 * to that of the device that this DRM instance attached to.
178 * Return: 0 on success or a negative error code on failure.
180 int drm_irq_by_busid(struct drm_device *dev, void *data,
181 struct drm_file *file_priv)
183 struct drm_irq_busid *p = data;
185 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
188 /* UMS was only ever support on PCI devices. */
189 if (WARN_ON(!dev->pdev))
192 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
195 return drm_pci_irq_by_busid(dev, p);
198 static void drm_pci_agp_init(struct drm_device *dev)
200 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
201 if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP))
202 dev->agp = drm_agp_init(dev);
204 dev->agp->agp_mtrr = arch_phys_wc_add(
205 dev->agp->agp_info.aper_base,
206 dev->agp->agp_info.aper_size *
212 void drm_pci_agp_destroy(struct drm_device *dev)
215 arch_phys_wc_del(dev->agp->agp_mtrr);
216 drm_legacy_agp_clear(dev);
223 * drm_get_pci_dev - Register a PCI device with the DRM subsystem
225 * @ent: entry from the PCI ID table that matches @pdev
226 * @driver: DRM device driver
228 * Attempt to gets inter module "drm" information. If we are first
229 * then register the character device and inter module information.
230 * Try and register, if we fail to register, backout previous work.
232 * NOTE: This function is deprecated, please use drm_dev_alloc() and
233 * drm_dev_register() instead and remove your &drm_driver.load callback.
235 * Return: 0 on success or a negative error code on failure.
237 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
238 struct drm_driver *driver)
240 struct drm_device *dev;
245 dev = drm_dev_alloc(driver, &pdev->dev);
249 ret = pci_enable_device(pdev);
255 dev->hose = pdev->sysdata;
258 if (drm_core_check_feature(dev, DRIVER_MODESET))
259 pci_set_drvdata(pdev, dev);
261 drm_pci_agp_init(dev);
263 ret = drm_dev_register(dev, ent->driver_data);
267 /* No locking needed since shadow-attach is single-threaded since it may
268 * only be called from the per-driver module init hook. */
269 if (drm_core_check_feature(dev, DRIVER_LEGACY))
270 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
275 drm_pci_agp_destroy(dev);
276 pci_disable_device(pdev);
281 EXPORT_SYMBOL(drm_get_pci_dev);
284 * drm_pci_init - Register matching PCI devices with the DRM subsystem
285 * @driver: DRM device driver
286 * @pdriver: PCI device driver
288 * Initializes a drm_device structures, registering the stubs and initializing
291 * NOTE: This function is deprecated. Modern modesetting drm drivers should use
292 * pci_register_driver() directly, this function only provides shadow-binding
293 * support for old legacy drivers on top of that core pci function.
295 * Return: 0 on success or a negative error code on failure.
297 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
299 struct pci_dev *pdev = NULL;
300 const struct pci_device_id *pid;
305 if (!(driver->driver_features & DRIVER_LEGACY))
306 return pci_register_driver(pdriver);
308 /* If not using KMS, fall back to stealth mode manual scanning. */
309 INIT_LIST_HEAD(&driver->legacy_dev_list);
310 for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
311 pid = &pdriver->id_table[i];
313 /* Loop around setting up a DRM device for each PCI device
314 * matching our ID and device class. If we had the internal
315 * function that pci_get_subsys and pci_get_class used, we'd
316 * be able to just pass pid in instead of doing a two-stage
321 pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
322 pid->subdevice, pdev)) != NULL) {
323 if ((pdev->class & pid->class_mask) != pid->class)
326 /* stealth mode requires a manual probe */
328 drm_get_pci_dev(pdev, pid, driver);
334 int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask)
336 struct pci_dev *root;
343 root = dev->pdev->bus->self;
345 /* we've been informed via and serverworks don't make the cut */
346 if (root->vendor == PCI_VENDOR_ID_VIA ||
347 root->vendor == PCI_VENDOR_ID_SERVERWORKS)
350 pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap);
351 pcie_capability_read_dword(root, PCI_EXP_LNKCAP2, &lnkcap2);
353 if (lnkcap2) { /* PCIe r3.0-compliant */
354 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB)
355 *mask |= DRM_PCIE_SPEED_25;
356 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB)
357 *mask |= DRM_PCIE_SPEED_50;
358 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB)
359 *mask |= DRM_PCIE_SPEED_80;
360 } else { /* pre-r3.0 */
361 if (lnkcap & PCI_EXP_LNKCAP_SLS_2_5GB)
362 *mask |= DRM_PCIE_SPEED_25;
363 if (lnkcap & PCI_EXP_LNKCAP_SLS_5_0GB)
364 *mask |= (DRM_PCIE_SPEED_25 | DRM_PCIE_SPEED_50);
367 DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2);
370 EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask);
372 int drm_pcie_get_max_link_width(struct drm_device *dev, u32 *mlw)
374 struct pci_dev *root;
381 root = dev->pdev->bus->self;
383 pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap);
385 *mlw = (lnkcap & PCI_EXP_LNKCAP_MLW) >> 4;
387 DRM_INFO("probing mlw for device %x:%x = %x\n", root->vendor, root->device, lnkcap);
390 EXPORT_SYMBOL(drm_pcie_get_max_link_width);
394 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
399 void drm_pci_agp_destroy(struct drm_device *dev) {}
401 int drm_irq_by_busid(struct drm_device *dev, void *data,
402 struct drm_file *file_priv)
408 EXPORT_SYMBOL(drm_pci_init);
411 * drm_pci_exit - Unregister matching PCI devices from the DRM subsystem
412 * @driver: DRM device driver
413 * @pdriver: PCI device driver
415 * Unregisters one or more devices matched by a PCI driver from the DRM
418 * NOTE: This function is deprecated. Modern modesetting drm drivers should use
419 * pci_unregister_driver() directly, this function only provides shadow-binding
420 * support for old legacy drivers on top of that core pci function.
422 void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
424 struct drm_device *dev, *tmp;
427 if (!(driver->driver_features & DRIVER_LEGACY)) {
428 pci_unregister_driver(pdriver);
430 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list,
432 list_del(&dev->legacy_dev_list);
436 DRM_INFO("Module unloaded\n");
438 EXPORT_SYMBOL(drm_pci_exit);