- 根目录:
- drivers
- gpu
- drm
- drm_pci.c
/* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-c -*- */
/**
* \file drm_pci.c
* \brief Functions and ioctls to manage PCI memory
*
* \warning These interfaces aren't stable yet.
*
* \todo Implement the remaining ioctl's for the PCI pools.
* \todo The wrappers here are so thin that they would be better off inlined..
*
* \author José Fonseca <jrfonseca@tungstengraphics.com>
* \author Leif Delgass <ldelgass@retinalburn.net>
*/
/*
* 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 "drmP.h"
/**********************************************************************/
/** \name PCI memory */
/*@{*/
/**
* \brief Allocate a PCI consistent memory block, for DMA.
*/
drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
{
drm_dma_handle_t *dmah;
#if 1
unsigned long addr;
size_t sz;
#endif
/* 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 | __GFP_COMP);
if (dmah->vaddr == NULL) {
kfree(dmah);
return NULL;
}
memset(dmah->vaddr, 0, size);
/* 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(addr));
}
return dmah;
}
EXPORT_SYMBOL(drm_pci_alloc);
/**
* \brief 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_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
{
#if 1
unsigned long addr;
size_t sz;
#endif
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(addr));
}
dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
dmah->busaddr);
}
}
/**
* \brief Free a PCI consistent memory block
*/
void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
{
__drm_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);
}
static int drm_pci_get_irq(struct drm_device *dev)
{
return dev->pdev->irq;
}
static const char *drm_pci_get_name(struct drm_device *dev)
{
struct pci_driver *pdriver = dev->driver->kdriver.pci;
return pdriver->name;
}
int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
{
int len, ret;
struct pci_driver *pdriver = dev->driver->kdriver.pci;
master->unique_len = 40;
master->unique_size = master->unique_len;
master->unique = kmalloc(master->unique_size, GFP_KERNEL);
if (master->unique == NULL)
return -ENOMEM;
len = snprintf(master->unique, master->unique_len,
"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 (len >= master->unique_len) {
DRM_ERROR("buffer overflow");
ret = -EINVAL;
goto err;
} else
master->unique_len = len;
dev->devname =
kmalloc(strlen(pdriver->name) +
master->unique_len + 2, GFP_KERNEL);
if (dev->devname == NULL) {
ret = -ENOMEM;
goto err;
}
sprintf(dev->devname, "%s@%s", pdriver->name,
master->unique);
return 0;
err:
return ret;
}
int drm_pci_set_unique(struct drm_device *dev,
struct drm_master *master,
struct drm_unique *u)
{
int domain, bus, slot, func, ret;
const char *bus_name;
master->unique_len = u->unique_len;
master->unique_size = u->unique_len + 1;
master->unique = kmalloc(master->unique_size, GFP_KERNEL);
if (!master->unique) {
ret = -ENOMEM;
goto err;
}
if (copy_from_user(master->unique, u->unique, master->unique_len)) {
ret = -EFAULT;
goto err;
}
master->unique[master->unique_len] = '\0';
bus_name = dev->driver->bus->get_name(dev);
dev->devname = kmalloc(strlen(bus_name) +
strlen(master->unique) + 2, GFP_KERNEL);
if (!dev->devname) {
ret = -ENOMEM;
goto err;
}
sprintf(dev->devname, "%s@%s", bus_name,
master->unique);
/* Return error if the busid submitted doesn't match the device's actual
* busid.
*/
ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
if (ret != 3) {
ret = -EINVAL;
goto err;
}
domain = bus >> 8;
bus &= 0xff;
if ((domain != drm_get_pci_domain(dev)) ||
(bus != dev->pdev->bus->number) ||
(slot != PCI_SLOT(dev->pdev->devfn)) ||
(func != PCI_FUNC(dev->pdev->devfn))) {
ret = -EINVAL;
goto err;
}
return 0;
err:
return ret;
}
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;
}
int drm_pci_agp_init(struct drm_device *dev)
{
if (drm_core_has_AGP(dev)) {
if (drm_pci_device_is_agp(dev))
dev->agp = drm_agp_init(dev);
if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
&& (dev->agp == NULL)) {
DRM_ERROR("Cannot initialize the agpgart module.\n");
return -EINVAL;
}
if (drm_core_has_MTRR(dev)) {
if (dev->agp)
dev->agp->agp_mtrr =
mtrr_add(dev->agp->agp_info.aper_base,
dev->agp->agp_info.aper_size *
1024 * 1024, MTRR_TYPE_WRCOMB, 1);
}
}
return 0;
}
static struct drm_bus drm_pci_bus = {
.bus_type = DRIVER_BUS_PCI,
.get_irq = drm_pci_get_irq,
.get_name = drm_pci_get_name,
.set_busid = drm_pci_set_busid,
.set_unique = drm_pci_set_unique,
.irq_by_busid = drm_pci_irq_by_busid,
.agp_init = drm_pci_agp_init,
};
/**
* Register.
*
* \param pdev - PCI device structure
* \param ent entry from the PCI ID table with device type flags
* \return zero on success or a negative number on failure.
*
* 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.
*/
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 = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
ret = pci_enable_device(pdev);
if (ret)
goto err_g1;
pci_set_master(pdev);
dev->pdev = pdev;
dev->dev = &pdev->dev;
dev->pci_device = pdev->device;
dev->pci_vendor = pdev->vendor;
#ifdef __alpha__
dev->hose = pdev->sysdata;
#endif
mutex_lock(&drm_global_mutex);
if ((ret = drm_fill_in_dev(dev, ent, driver))) {
printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
goto err_g2;
}
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
pci_set_drvdata(pdev, dev);
ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
if (ret)
goto err_g2;
}
if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
goto err_g3;
if (dev->driver->load) {
ret = dev->driver->load(dev, ent->driver_data);
if (ret)
goto err_g4;
}
/* setup the grouping for the legacy output */
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
ret = drm_mode_group_init_legacy_group(dev,
&dev->primary->mode_group);
if (ret)
goto err_g4;
}
list_add_tail(&dev->driver_item, &driver->device_list);
DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
driver->name, driver->major, driver->minor, driver->patchlevel,
driver->date, pci_name(pdev), dev->primary->index);
mutex_unlock(&drm_global_mutex);
return 0;
err_g4:
drm_put_minor(&dev->primary);
err_g3:
if (drm_core_check_feature(dev, DRIVER_MODESET))
drm_put_minor(&dev->control);
err_g2:
pci_disable_device(pdev);
err_g1:
kfree(dev);
mutex_unlock(&drm_global_mutex);
return ret;
}
EXPORT_SYMBOL(drm_get_pci_dev);
/**
* PCI device initialization. Called direct from modules at load time.
*
* \return zero on success or a negative number on failure.
*
* Initializes a drm_device structures,registering the
* stubs and initializing the AGP device.
*
* Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
* after the initialization for driver customization.
*/
int drm_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");
INIT_LIST_HEAD(&driver->device_list);
driver->kdriver.pci = pdriver;
driver->bus = &drm_pci_bus;
if (driver->driver_features & DRIVER_MODESET)
return pci_register_driver(pdriver);
/* If not using KMS, fall back to stealth mode manual scanning. */
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;
}
#else
int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
{
return -1;
}
#endif
EXPORT_SYMBOL(drm_pci_init);
/*@}*/
void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
{
struct drm_device *dev, *tmp;
DRM_DEBUG("\n");
if (driver->driver_features & DRIVER_MODESET) {
pci_unregister_driver(pdriver);
} else {
list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
drm_put_dev(dev);
}
DRM_INFO("Module unloaded\n");
}
EXPORT_SYMBOL(drm_pci_exit);