/* $NetBSD: drm_pci.c,v 1.7 2021/12/18 23:44:57 riastradh Exp $ */
/*
* 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: drm_pci.c,v 1.7 2021/12/18 23:44:57 riastradh Exp $");
#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;
dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size,
&dmah->busaddr,
GFP_KERNEL | __GFP_COMP);
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));
}
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);
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);
#ifdef [31mCONFIG_DRM_LEGACY[0m
/**
* 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);
/**
* 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);
#endif