treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / gpu / drm / drm_pci.c
blobf2e43d341980f019a8b3123fefa98349d1846fd0
1 /*
2 * Copyright 2003 José Fonseca.
3 * Copyright 2003 Leif Delgass.
4 * All Rights Reserved.
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
15 * Software.
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/dma-mapping.h>
26 #include <linux/export.h>
27 #include <linux/pci.h>
28 #include <linux/slab.h>
30 #include <drm/drm.h>
31 #include <drm/drm_agpsupport.h>
32 #include <drm/drm_drv.h>
33 #include <drm/drm_pci.h>
34 #include <drm/drm_print.h>
36 #include "drm_internal.h"
37 #include "drm_legacy.h"
39 /**
40 * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA.
41 * @dev: DRM device
42 * @size: size of block to allocate
43 * @align: alignment of block
45 * FIXME: This is a needless abstraction of the Linux dma-api and should be
46 * removed.
48 * Return: A handle to the allocated memory block on success or NULL on
49 * failure.
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 unsigned long addr;
55 size_t sz;
57 /* pci_alloc_consistent only guarantees alignment to the smallest
58 * PAGE_SIZE order which is greater than or equal to the requested size.
59 * Return NULL here for now to make sure nobody tries for larger alignment
61 if (align > size)
62 return NULL;
64 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
65 if (!dmah)
66 return NULL;
68 dmah->size = size;
69 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size,
70 &dmah->busaddr,
71 GFP_KERNEL | __GFP_COMP);
73 if (dmah->vaddr == NULL) {
74 kfree(dmah);
75 return NULL;
78 /* XXX - Is virt_to_page() legal for consistent mem? */
79 /* Reserve */
80 for (addr = (unsigned long)dmah->vaddr, sz = size;
81 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
82 SetPageReserved(virt_to_page((void *)addr));
85 return dmah;
88 EXPORT_SYMBOL(drm_pci_alloc);
91 * Free a PCI consistent memory block without freeing its descriptor.
93 * This function is for internal use in the Linux-specific DRM core code.
95 void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
97 unsigned long addr;
98 size_t sz;
100 if (dmah->vaddr) {
101 /* XXX - Is virt_to_page() legal for consistent mem? */
102 /* Unreserve */
103 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
104 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
105 ClearPageReserved(virt_to_page((void *)addr));
107 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
108 dmah->busaddr);
113 * drm_pci_free - Free a PCI consistent memory block
114 * @dev: DRM device
115 * @dmah: handle to memory block
117 * FIXME: This is a needless abstraction of the Linux dma-api and should be
118 * removed.
120 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
122 __drm_legacy_pci_free(dev, dmah);
123 kfree(dmah);
126 EXPORT_SYMBOL(drm_pci_free);
128 static int drm_get_pci_domain(struct drm_device *dev)
130 #ifndef __alpha__
131 /* For historical reasons, drm_get_pci_domain() is busticated
132 * on most archs and has to remain so for userspace interface
133 * < 1.4, except on alpha which was right from the beginning
135 if (dev->if_version < 0x10004)
136 return 0;
137 #endif /* __alpha__ */
139 return pci_domain_nr(dev->pdev->bus);
142 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
144 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d",
145 drm_get_pci_domain(dev),
146 dev->pdev->bus->number,
147 PCI_SLOT(dev->pdev->devfn),
148 PCI_FUNC(dev->pdev->devfn));
149 if (!master->unique)
150 return -ENOMEM;
152 master->unique_len = strlen(master->unique);
153 return 0;
156 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
158 if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
159 (p->busnum & 0xff) != dev->pdev->bus->number ||
160 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
161 return -EINVAL;
163 p->irq = dev->pdev->irq;
165 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
166 p->irq);
167 return 0;
171 * drm_irq_by_busid - Get interrupt from bus ID
172 * @dev: DRM device
173 * @data: IOCTL parameter pointing to a drm_irq_busid structure
174 * @file_priv: DRM file private.
176 * Finds the PCI device with the specified bus id and gets its IRQ number.
177 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
178 * to that of the device that this DRM instance attached to.
180 * Return: 0 on success or a negative error code on failure.
182 int drm_irq_by_busid(struct drm_device *dev, void *data,
183 struct drm_file *file_priv)
185 struct drm_irq_busid *p = data;
187 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
188 return -EOPNOTSUPP;
190 /* UMS was only ever support on PCI devices. */
191 if (WARN_ON(!dev->pdev))
192 return -EINVAL;
194 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
195 return -EOPNOTSUPP;
197 return drm_pci_irq_by_busid(dev, p);
200 static void drm_pci_agp_init(struct drm_device *dev)
202 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
203 if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP))
204 dev->agp = drm_agp_init(dev);
205 if (dev->agp) {
206 dev->agp->agp_mtrr = arch_phys_wc_add(
207 dev->agp->agp_info.aper_base,
208 dev->agp->agp_info.aper_size *
209 1024 * 1024);
214 void drm_pci_agp_destroy(struct drm_device *dev)
216 if (dev->agp) {
217 arch_phys_wc_del(dev->agp->agp_mtrr);
218 drm_legacy_agp_clear(dev);
219 kfree(dev->agp);
220 dev->agp = NULL;
225 * drm_get_pci_dev - Register a PCI device with the DRM subsystem
226 * @pdev: PCI device
227 * @ent: entry from the PCI ID table that matches @pdev
228 * @driver: DRM device driver
230 * Attempt to gets inter module "drm" information. If we are first
231 * then register the character device and inter module information.
232 * Try and register, if we fail to register, backout previous work.
234 * NOTE: This function is deprecated, please use drm_dev_alloc() and
235 * drm_dev_register() instead and remove your &drm_driver.load callback.
237 * Return: 0 on success or a negative error code on failure.
239 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
240 struct drm_driver *driver)
242 struct drm_device *dev;
243 int ret;
245 DRM_DEBUG("\n");
247 dev = drm_dev_alloc(driver, &pdev->dev);
248 if (IS_ERR(dev))
249 return PTR_ERR(dev);
251 ret = pci_enable_device(pdev);
252 if (ret)
253 goto err_free;
255 dev->pdev = pdev;
256 #ifdef __alpha__
257 dev->hose = pdev->sysdata;
258 #endif
260 if (drm_core_check_feature(dev, DRIVER_MODESET))
261 pci_set_drvdata(pdev, dev);
263 drm_pci_agp_init(dev);
265 ret = drm_dev_register(dev, ent->driver_data);
266 if (ret)
267 goto err_agp;
269 /* No locking needed since shadow-attach is single-threaded since it may
270 * only be called from the per-driver module init hook. */
271 if (drm_core_check_feature(dev, DRIVER_LEGACY))
272 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
274 return 0;
276 err_agp:
277 drm_pci_agp_destroy(dev);
278 pci_disable_device(pdev);
279 err_free:
280 drm_dev_put(dev);
281 return ret;
283 EXPORT_SYMBOL(drm_get_pci_dev);
285 #ifdef CONFIG_DRM_LEGACY
288 * drm_legacy_pci_init - shadow-attach a legacy DRM PCI driver
289 * @driver: DRM device driver
290 * @pdriver: PCI device driver
292 * This is only used by legacy dri1 drivers and deprecated.
294 * Return: 0 on success or a negative error code on failure.
296 int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
298 struct pci_dev *pdev = NULL;
299 const struct pci_device_id *pid;
300 int i;
302 DRM_DEBUG("\n");
304 if (WARN_ON(!(driver->driver_features & DRIVER_LEGACY)))
305 return -EINVAL;
307 /* If not using KMS, fall back to stealth mode manual scanning. */
308 INIT_LIST_HEAD(&driver->legacy_dev_list);
309 for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
310 pid = &pdriver->id_table[i];
312 /* Loop around setting up a DRM device for each PCI device
313 * matching our ID and device class. If we had the internal
314 * function that pci_get_subsys and pci_get_class used, we'd
315 * be able to just pass pid in instead of doing a two-stage
316 * thing.
318 pdev = NULL;
319 while ((pdev =
320 pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
321 pid->subdevice, pdev)) != NULL) {
322 if ((pdev->class & pid->class_mask) != pid->class)
323 continue;
325 /* stealth mode requires a manual probe */
326 pci_dev_get(pdev);
327 drm_get_pci_dev(pdev, pid, driver);
330 return 0;
332 EXPORT_SYMBOL(drm_legacy_pci_init);
335 * drm_legacy_pci_exit - unregister shadow-attach legacy DRM driver
336 * @driver: DRM device driver
337 * @pdriver: PCI device driver
339 * Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This
340 * is deprecated and only used by dri1 drivers.
342 void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
344 struct drm_device *dev, *tmp;
345 DRM_DEBUG("\n");
347 if (!(driver->driver_features & DRIVER_LEGACY)) {
348 WARN_ON(1);
349 } else {
350 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list,
351 legacy_dev_list) {
352 list_del(&dev->legacy_dev_list);
353 drm_put_dev(dev);
356 DRM_INFO("Module unloaded\n");
358 EXPORT_SYMBOL(drm_legacy_pci_exit);
360 #endif