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sys/dev/drm/core/drm_pci.c
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/* | |||||
* 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/dma-mapping.h> | |||||
#include <linux/export.h> | |||||
#include <linux/pci.h> | |||||
#include <linux/slab.h> | |||||
#include <drm/drm.h> | |||||
#include <drm/drm_agpsupport.h> | |||||
#include <drm/drm_drv.h> | |||||
#include <drm/drm_pci.h> | |||||
#include <drm/drm_print.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; | |||||
unsigned long addr; | |||||
size_t sz; | |||||
/* 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; | |||||
#ifdef __linux__ | |||||
dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, | |||||
&dmah->busaddr, | |||||
GFP_KERNEL | __GFP_COMP); | |||||
#else | |||||
dmah->vaddr = NULL; | |||||
#endif | |||||
if (dmah->vaddr == NULL) { | |||||
kfree(dmah); | |||||
return NULL; | |||||
} | |||||
/* XXX - Is virt_to_page() legal for consistent mem? */ | |||||
/* Reserve */ | |||||
for (addr = (unsigned long)dmah->vaddr, sz = size; | |||||
sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { | |||||
SetPageReserved(virt_to_page((void *)addr)); | |||||
} | |||||
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) | |||||
{ | |||||
unsigned long addr; | |||||
size_t sz; | |||||
if (dmah->vaddr) { | |||||
/* XXX - Is virt_to_page() legal for consistent mem? */ | |||||
/* Unreserve */ | |||||
for (addr = (unsigned long)dmah->vaddr, sz = dmah->size; | |||||
sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { | |||||
ClearPageReserved(virt_to_page((void *)addr)); | |||||
} | |||||
#ifdef __linux__ | |||||
dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, | |||||
dmah->busaddr); | |||||
#endif | |||||
} | |||||
} | |||||
/** | |||||
* 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 -EOPNOTSUPP; | |||||
/* 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 -EOPNOTSUPP; | |||||
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); |