diff options
Diffstat (limited to 'drivers/gpu/drm/drm_pci.c')
| -rw-r--r-- | drivers/gpu/drm/drm_pci.c | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c new file mode 100644 index 000000000..d89a99282 --- /dev/null +++ b/drivers/gpu/drm/drm_pci.c @@ -0,0 +1,343 @@ +/* + * Copyright 2003 José Fonseca. + * Copyright 2003 Leif Delgass. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/dma-mapping.h> +#include <linux/export.h> +#include <drm/drm_pci.h> +#include <drm/drmP.h> +#include "drm_internal.h" +#include "drm_legacy.h" + +/** + * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA. + * @dev: DRM device + * @size: size of block to allocate + * @align: alignment of block + * + * FIXME: This is a needless abstraction of the Linux dma-api and should be + * removed. + * + * Return: A handle to the allocated memory block on success or NULL on + * failure. + */ +drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align) +{ + drm_dma_handle_t *dmah; + + /* pci_alloc_consistent only guarantees alignment to the smallest + * PAGE_SIZE order which is greater than or equal to the requested size. + * Return NULL here for now to make sure nobody tries for larger alignment + */ + if (align > size) + return NULL; + + dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL); + if (!dmah) + return NULL; + + dmah->size = size; + dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL); + + if (dmah->vaddr == NULL) { + kfree(dmah); + return NULL; + } + + return dmah; +} + +EXPORT_SYMBOL(drm_pci_alloc); + +/* + * Free a PCI consistent memory block without freeing its descriptor. + * + * This function is for internal use in the Linux-specific DRM core code. + */ +void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) +{ + if (dmah->vaddr) + dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, + dmah->busaddr); +} + +/** + * drm_pci_free - Free a PCI consistent memory block + * @dev: DRM device + * @dmah: handle to memory block + * + * FIXME: This is a needless abstraction of the Linux dma-api and should be + * removed. + */ +void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) +{ + __drm_legacy_pci_free(dev, dmah); + kfree(dmah); +} + +EXPORT_SYMBOL(drm_pci_free); + +#ifdef CONFIG_PCI + +static int drm_get_pci_domain(struct drm_device *dev) +{ +#ifndef __alpha__ + /* For historical reasons, drm_get_pci_domain() is busticated + * on most archs and has to remain so for userspace interface + * < 1.4, except on alpha which was right from the beginning + */ + if (dev->if_version < 0x10004) + return 0; +#endif /* __alpha__ */ + + return pci_domain_nr(dev->pdev->bus); +} + +int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) +{ + master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d", + drm_get_pci_domain(dev), + dev->pdev->bus->number, + PCI_SLOT(dev->pdev->devfn), + PCI_FUNC(dev->pdev->devfn)); + if (!master->unique) + return -ENOMEM; + + master->unique_len = strlen(master->unique); + return 0; +} + +static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p) +{ + if ((p->busnum >> 8) != drm_get_pci_domain(dev) || + (p->busnum & 0xff) != dev->pdev->bus->number || + p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) + return -EINVAL; + + p->irq = dev->pdev->irq; + + DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, + p->irq); + return 0; +} + +/** + * drm_irq_by_busid - Get interrupt from bus ID + * @dev: DRM device + * @data: IOCTL parameter pointing to a drm_irq_busid structure + * @file_priv: DRM file private. + * + * Finds the PCI device with the specified bus id and gets its IRQ number. + * This IOCTL is deprecated, and will now return EINVAL for any busid not equal + * to that of the device that this DRM instance attached to. + * + * Return: 0 on success or a negative error code on failure. + */ +int drm_irq_by_busid(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_irq_busid *p = data; + + if (!drm_core_check_feature(dev, DRIVER_LEGACY)) + return -EINVAL; + + /* UMS was only ever support on PCI devices. */ + if (WARN_ON(!dev->pdev)) + return -EINVAL; + + if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) + return -EINVAL; + + return drm_pci_irq_by_busid(dev, p); +} + +static void drm_pci_agp_init(struct drm_device *dev) +{ + if (drm_core_check_feature(dev, DRIVER_USE_AGP)) { + if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP)) + dev->agp = drm_agp_init(dev); + if (dev->agp) { + dev->agp->agp_mtrr = arch_phys_wc_add( + dev->agp->agp_info.aper_base, + dev->agp->agp_info.aper_size * + 1024 * 1024); + } + } +} + +void drm_pci_agp_destroy(struct drm_device *dev) +{ + if (dev->agp) { + arch_phys_wc_del(dev->agp->agp_mtrr); + drm_legacy_agp_clear(dev); + kfree(dev->agp); + dev->agp = NULL; + } +} + +/** + * drm_get_pci_dev - Register a PCI device with the DRM subsystem + * @pdev: PCI device + * @ent: entry from the PCI ID table that matches @pdev + * @driver: DRM device driver + * + * Attempt to gets inter module "drm" information. If we are first + * then register the character device and inter module information. + * Try and register, if we fail to register, backout previous work. + * + * NOTE: This function is deprecated, please use drm_dev_alloc() and + * drm_dev_register() instead and remove your &drm_driver.load callback. + * + * Return: 0 on success or a negative error code on failure. + */ +int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent, + struct drm_driver *driver) +{ + struct drm_device *dev; + int ret; + + DRM_DEBUG("\n"); + + dev = drm_dev_alloc(driver, &pdev->dev); + if (IS_ERR(dev)) + return PTR_ERR(dev); + + ret = pci_enable_device(pdev); + if (ret) + goto err_free; + + dev->pdev = pdev; +#ifdef __alpha__ + dev->hose = pdev->sysdata; +#endif + + if (drm_core_check_feature(dev, DRIVER_MODESET)) + pci_set_drvdata(pdev, dev); + + drm_pci_agp_init(dev); + + ret = drm_dev_register(dev, ent->driver_data); + if (ret) + goto err_agp; + + /* No locking needed since shadow-attach is single-threaded since it may + * only be called from the per-driver module init hook. */ + if (drm_core_check_feature(dev, DRIVER_LEGACY)) + list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list); + + return 0; + +err_agp: + drm_pci_agp_destroy(dev); + pci_disable_device(pdev); +err_free: + drm_dev_put(dev); + return ret; +} +EXPORT_SYMBOL(drm_get_pci_dev); + +/** + * drm_legacy_pci_init - shadow-attach a legacy DRM PCI driver + * @driver: DRM device driver + * @pdriver: PCI device driver + * + * This is only used by legacy dri1 drivers and deprecated. + * + * Return: 0 on success or a negative error code on failure. + */ +int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) +{ + struct pci_dev *pdev = NULL; + const struct pci_device_id *pid; + int i; + + DRM_DEBUG("\n"); + + if (WARN_ON(!(driver->driver_features & DRIVER_LEGACY))) + return -EINVAL; + + /* If not using KMS, fall back to stealth mode manual scanning. */ + INIT_LIST_HEAD(&driver->legacy_dev_list); + for (i = 0; pdriver->id_table[i].vendor != 0; i++) { + pid = &pdriver->id_table[i]; + + /* Loop around setting up a DRM device for each PCI device + * matching our ID and device class. If we had the internal + * function that pci_get_subsys and pci_get_class used, we'd + * be able to just pass pid in instead of doing a two-stage + * thing. + */ + pdev = NULL; + while ((pdev = + pci_get_subsys(pid->vendor, pid->device, pid->subvendor, + pid->subdevice, pdev)) != NULL) { + if ((pdev->class & pid->class_mask) != pid->class) + continue; + + /* stealth mode requires a manual probe */ + pci_dev_get(pdev); + drm_get_pci_dev(pdev, pid, driver); + } + } + return 0; +} +EXPORT_SYMBOL(drm_legacy_pci_init); + +#else + +void drm_pci_agp_destroy(struct drm_device *dev) {} + +int drm_irq_by_busid(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + return -EINVAL; +} +#endif + +/** + * drm_legacy_pci_exit - unregister shadow-attach legacy DRM driver + * @driver: DRM device driver + * @pdriver: PCI device driver + * + * Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This + * is deprecated and only used by dri1 drivers. + */ +void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver) +{ + struct drm_device *dev, *tmp; + DRM_DEBUG("\n"); + + if (!(driver->driver_features & DRIVER_LEGACY)) { + WARN_ON(1); + } else { + list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list, + legacy_dev_list) { + list_del(&dev->legacy_dev_list); + drm_put_dev(dev); + } + } + DRM_INFO("Module unloaded\n"); +} +EXPORT_SYMBOL(drm_legacy_pci_exit); |