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/dma-mapping.h>
27 #include <linux/export.h>
29 #include "drm_internal.h"
30 #include "drm_legacy.h"
33 * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA.
35 * @size: size of block to allocate
36 * @align: alignment of block
38 * Return: A handle to the allocated memory block on success or NULL on
41 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
43 drm_dma_handle_t *dmah;
47 /* pci_alloc_consistent only guarantees alignment to the smallest
48 * PAGE_SIZE order which is greater than or equal to the requested size.
49 * Return NULL here for now to make sure nobody tries for larger alignment
54 dmah = kmalloc(sizeof(drm_dma_handle_t), M_DRM, M_WAITOK | M_NULLOK);
59 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL);
61 if (dmah->vaddr == NULL) {
66 memset(dmah->vaddr, 0, size);
68 /* XXX - Is virt_to_page() legal for consistent mem? */
70 for (addr = (unsigned long)dmah->vaddr, sz = size;
71 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
73 SetPageReserved(virt_to_page((void *)addr));
80 EXPORT_SYMBOL(drm_pci_alloc);
83 * Free a PCI consistent memory block without freeing its descriptor.
85 * This function is for internal use in the Linux-specific DRM core code.
87 void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
93 /* XXX - Is virt_to_page() legal for consistent mem? */
95 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
96 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
98 ClearPageReserved(virt_to_page((void *)addr));
101 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
107 * drm_pci_free - Free a PCI consistent memory block
109 * @dmah: handle to memory block
111 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
113 __drm_legacy_pci_free(dev, dmah);
117 EXPORT_SYMBOL(drm_pci_free);
121 static int drm_get_pci_domain(struct drm_device *dev)
124 /* For historical reasons, drm_get_pci_domain() is busticated
125 * on most archs and has to remain so for userspace interface
126 * < 1.4, except on alpha which was right from the beginning
128 if (dev->if_version < 0x10004)
130 #endif /* __alpha__ */
133 return pci_domain_nr(dev->pdev->bus);
135 return dev->pci_domain;
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 int drm_pci_set_unique(struct drm_device *dev,
155 struct drm_master *master,
156 struct drm_unique *u)
158 int domain, bus, slot, func, ret;
160 master->unique_len = u->unique_len;
161 master->unique = kmalloc(master->unique_len + 1, M_DRM, M_NOWAIT);
162 if (!master->unique) {
167 if (copy_from_user(master->unique, u->unique, master->unique_len)) {
172 master->unique[master->unique_len] = '\0';
174 /* Return error if the busid submitted doesn't match the device's actual
177 ret = ksscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
186 if ((domain != drm_get_pci_domain(dev)) ||
187 (bus != dev->pdev->bus->number) ||
188 (slot != PCI_SLOT(dev->pdev->devfn)) ||
189 (func != PCI_FUNC(dev->pdev->devfn))) {
198 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
200 if ((p->busnum >> 8) != dev->pci_domain ||
201 (p->busnum & 0xff) != dev->pci_bus ||
202 p->devnum != dev->pci_slot || p->funcnum != dev->pci_func)
205 p->irq = dev->pdev->irq;
207 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
213 * drm_irq_by_busid - Get interrupt from bus ID
215 * @data: IOCTL parameter pointing to a drm_irq_busid structure
216 * @file_priv: DRM file private.
218 * Finds the PCI device with the specified bus id and gets its IRQ number.
219 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
220 * to that of the device that this DRM instance attached to.
222 * Return: 0 on success or a negative error code on failure.
224 int drm_irq_by_busid(struct drm_device *dev, void *data,
225 struct drm_file *file_priv)
227 struct drm_irq_busid *p = data;
229 if (drm_core_check_feature(dev, DRIVER_MODESET))
232 /* UMS was only ever support on PCI devices. */
233 if (WARN_ON(!dev->pdev))
236 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
239 return drm_pci_irq_by_busid(dev, p);
243 * drm_pci_init - Register matching PCI devices with the DRM subsystem
244 * @driver: DRM device driver
245 * @pdriver: PCI device driver
247 * Initializes a drm_device structures, registering the stubs and initializing
250 * NOTE: This function is deprecated. Modern modesetting drm drivers should use
251 * pci_register_driver() directly, this function only provides shadow-binding
252 * support for old legacy drivers on top of that core pci function.
254 * Return: 0 on success or a negative error code on failure.
256 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
259 struct pci_dev *pdev = NULL;
260 const struct pci_device_id *pid;
266 if (driver->driver_features & DRIVER_MODESET)
267 return pci_register_driver(pdriver);
270 /* If not using KMS, fall back to stealth mode manual scanning. */
271 INIT_LIST_HEAD(&driver->legacy_dev_list);
272 for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
273 pid = &pdriver->id_table[i];
275 /* Loop around setting up a DRM device for each PCI device
276 * matching our ID and device class. If we had the internal
277 * function that pci_get_subsys and pci_get_class used, we'd
278 * be able to just pass pid in instead of doing a two-stage
283 pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
284 pid->subdevice, pdev)) != NULL) {
285 if ((pdev->class & pid->class_mask) != pid->class)
288 /* stealth mode requires a manual probe */
290 drm_get_pci_dev(pdev, pid, driver);
297 int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask)
301 u32 lnkcap = 0, lnkcap2 = 0;
307 root = device_get_parent(dev->dev->bsddev);
309 /* we've been informed via and serverworks don't make the cut */
310 if (pci_get_vendor(root) == PCI_VENDOR_ID_VIA ||
311 pci_get_vendor(root) == PCI_VENDOR_ID_SERVERWORKS)
315 pci_find_extcap(root, PCIY_EXPRESS, &pos);
319 lnkcap = pci_read_config(root, pos + PCIER_LINKCAP, 4);
320 lnkcap2 = pci_read_config(root, pos + PCIER_LINK_CAP2, 4);
322 lnkcap &= PCIEM_LNKCAP_SPEED_MASK;
325 #define PCI_EXP_LNKCAP_SLS_2_5GB PCIEM_LNKCAP_SPEED_2_5
326 #define PCI_EXP_LNKCAP_SLS_5_0GB PCIEM_LNKCAP_SPEED_5
327 #define PCI_EXP_LNKCAP2_SLS_2_5GB 0x02 /* Supported Link Speed 2.5GT/s */
328 #define PCI_EXP_LNKCAP2_SLS_5_0GB 0x04 /* Supported Link Speed 5.0GT/s */
329 #define PCI_EXP_LNKCAP2_SLS_8_0GB 0x08 /* Supported Link Speed 8.0GT/s */
331 if (lnkcap2) { /* PCIe r3.0-compliant */
332 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB)
333 *mask |= DRM_PCIE_SPEED_25;
334 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB)
335 *mask |= DRM_PCIE_SPEED_50;
336 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB)
337 *mask |= DRM_PCIE_SPEED_80;
338 } else { /* pre-r3.0 */
339 if (lnkcap & PCI_EXP_LNKCAP_SLS_2_5GB)
340 *mask |= DRM_PCIE_SPEED_25;
341 if (lnkcap & PCI_EXP_LNKCAP_SLS_5_0GB)
342 *mask |= (DRM_PCIE_SPEED_25 | DRM_PCIE_SPEED_50);
345 DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", pci_get_vendor(root), pci_get_device(root), lnkcap, lnkcap2);
348 EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask);
351 int drm_pcie_get_max_link_width(struct drm_device *dev, u32 *mlw)
353 struct pci_dev *root;
360 root = dev->pdev->bus->self;
362 pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap);
364 *mlw = (lnkcap & PCI_EXP_LNKCAP_MLW) >> 4;
366 DRM_INFO("probing mlw for device %x:%x = %x\n", root->vendor, root->device, lnkcap);
369 EXPORT_SYMBOL(drm_pcie_get_max_link_width);
375 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
380 void drm_pci_agp_destroy(struct drm_device *dev) {}
382 int drm_irq_by_busid(struct drm_device *dev, void *data,
383 struct drm_file *file_priv)
388 int drm_pci_set_unique(struct drm_device *dev,
389 struct drm_master *master,
390 struct drm_unique *u)
396 EXPORT_SYMBOL(drm_pci_init);