454 lines
12 KiB
C
454 lines
12 KiB
C
/*
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* Copyright 2003 José Fonseca.
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* Copyright 2003 Leif Delgass.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/dma-mapping.h>
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#include <linux/export.h>
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#include <drm/drmP.h>
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#include "drm_legacy.h"
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/**
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* drm_pci_alloc - Allocate a PCI consistent memory block, for DMA.
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* @dev: DRM device
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* @size: size of block to allocate
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* @align: alignment of block
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*
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* Return: A handle to the allocated memory block on success or NULL on
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* failure.
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*/
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drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
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{
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drm_dma_handle_t *dmah;
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unsigned long addr;
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size_t sz;
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/* pci_alloc_consistent only guarantees alignment to the smallest
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* PAGE_SIZE order which is greater than or equal to the requested size.
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* Return NULL here for now to make sure nobody tries for larger alignment
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*/
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if (align > size)
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return NULL;
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dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
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if (!dmah)
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return NULL;
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dmah->size = size;
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dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP);
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if (dmah->vaddr == NULL) {
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kfree(dmah);
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return NULL;
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}
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memset(dmah->vaddr, 0, size);
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/* XXX - Is virt_to_page() legal for consistent mem? */
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/* Reserve */
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for (addr = (unsigned long)dmah->vaddr, sz = size;
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sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
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SetPageReserved(virt_to_page((void *)addr));
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}
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return dmah;
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}
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EXPORT_SYMBOL(drm_pci_alloc);
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/*
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* Free a PCI consistent memory block without freeing its descriptor.
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*
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* This function is for internal use in the Linux-specific DRM core code.
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*/
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void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
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{
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unsigned long addr;
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size_t sz;
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if (dmah->vaddr) {
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/* XXX - Is virt_to_page() legal for consistent mem? */
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/* Unreserve */
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for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
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sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
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ClearPageReserved(virt_to_page((void *)addr));
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}
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dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
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dmah->busaddr);
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}
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}
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/**
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* drm_pci_free - Free a PCI consistent memory block
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* @dev: DRM device
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* @dmah: handle to memory block
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*/
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void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
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{
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__drm_legacy_pci_free(dev, dmah);
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kfree(dmah);
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}
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EXPORT_SYMBOL(drm_pci_free);
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#ifdef CONFIG_PCI
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static int drm_get_pci_domain(struct drm_device *dev)
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{
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#ifndef __alpha__
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/* For historical reasons, drm_get_pci_domain() is busticated
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* on most archs and has to remain so for userspace interface
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* < 1.4, except on alpha which was right from the beginning
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*/
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if (dev->if_version < 0x10004)
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return 0;
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#endif /* __alpha__ */
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return pci_domain_nr(dev->pdev->bus);
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}
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int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
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{
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master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d",
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drm_get_pci_domain(dev),
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dev->pdev->bus->number,
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PCI_SLOT(dev->pdev->devfn),
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PCI_FUNC(dev->pdev->devfn));
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if (!master->unique)
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return -ENOMEM;
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master->unique_len = strlen(master->unique);
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return 0;
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}
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EXPORT_SYMBOL(drm_pci_set_busid);
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int drm_pci_set_unique(struct drm_device *dev,
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struct drm_master *master,
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struct drm_unique *u)
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{
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int domain, bus, slot, func, ret;
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master->unique_len = u->unique_len;
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master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
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if (!master->unique) {
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ret = -ENOMEM;
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goto err;
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}
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if (copy_from_user(master->unique, u->unique, master->unique_len)) {
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ret = -EFAULT;
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goto err;
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}
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master->unique[master->unique_len] = '\0';
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/* Return error if the busid submitted doesn't match the device's actual
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* busid.
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*/
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ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
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if (ret != 3) {
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ret = -EINVAL;
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goto err;
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}
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domain = bus >> 8;
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bus &= 0xff;
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if ((domain != drm_get_pci_domain(dev)) ||
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(bus != dev->pdev->bus->number) ||
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(slot != PCI_SLOT(dev->pdev->devfn)) ||
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(func != PCI_FUNC(dev->pdev->devfn))) {
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ret = -EINVAL;
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goto err;
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}
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return 0;
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err:
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return ret;
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}
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static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
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{
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if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
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(p->busnum & 0xff) != dev->pdev->bus->number ||
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p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
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return -EINVAL;
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p->irq = dev->pdev->irq;
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DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
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p->irq);
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return 0;
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}
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/**
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* drm_irq_by_busid - Get interrupt from bus ID
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* @dev: DRM device
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* @data: IOCTL parameter pointing to a drm_irq_busid structure
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* @file_priv: DRM file private.
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*
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* Finds the PCI device with the specified bus id and gets its IRQ number.
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* This IOCTL is deprecated, and will now return EINVAL for any busid not equal
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* to that of the device that this DRM instance attached to.
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int drm_irq_by_busid(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_irq_busid *p = data;
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if (drm_core_check_feature(dev, DRIVER_MODESET))
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return -EINVAL;
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/* UMS was only ever support on PCI devices. */
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if (WARN_ON(!dev->pdev))
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return -EINVAL;
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if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
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return -EINVAL;
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return drm_pci_irq_by_busid(dev, p);
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}
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static void drm_pci_agp_init(struct drm_device *dev)
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{
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if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
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if (drm_pci_device_is_agp(dev))
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dev->agp = drm_agp_init(dev);
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if (dev->agp) {
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dev->agp->agp_mtrr = arch_phys_wc_add(
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dev->agp->agp_info.aper_base,
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dev->agp->agp_info.aper_size *
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1024 * 1024);
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}
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}
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}
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void drm_pci_agp_destroy(struct drm_device *dev)
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{
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if (dev->agp) {
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arch_phys_wc_del(dev->agp->agp_mtrr);
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drm_agp_clear(dev);
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kfree(dev->agp);
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dev->agp = NULL;
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}
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}
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/**
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* drm_get_pci_dev - Register a PCI device with the DRM subsystem
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* @pdev: PCI device
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* @ent: entry from the PCI ID table that matches @pdev
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* @driver: DRM device driver
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*
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* Attempt to gets inter module "drm" information. If we are first
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* then register the character device and inter module information.
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* Try and register, if we fail to register, backout previous work.
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
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struct drm_driver *driver)
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{
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struct drm_device *dev;
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int ret;
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DRM_DEBUG("\n");
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dev = drm_dev_alloc(driver, &pdev->dev);
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if (!dev)
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return -ENOMEM;
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ret = pci_enable_device(pdev);
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if (ret)
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goto err_free;
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dev->pdev = pdev;
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#ifdef __alpha__
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dev->hose = pdev->sysdata;
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#endif
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if (drm_core_check_feature(dev, DRIVER_MODESET))
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pci_set_drvdata(pdev, dev);
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drm_pci_agp_init(dev);
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ret = drm_dev_register(dev, ent->driver_data);
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if (ret)
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goto err_agp;
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DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
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driver->name, driver->major, driver->minor, driver->patchlevel,
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driver->date, pci_name(pdev), dev->primary->index);
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/* No locking needed since shadow-attach is single-threaded since it may
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* only be called from the per-driver module init hook. */
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
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return 0;
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err_agp:
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drm_pci_agp_destroy(dev);
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pci_disable_device(pdev);
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err_free:
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drm_dev_unref(dev);
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return ret;
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}
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EXPORT_SYMBOL(drm_get_pci_dev);
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/**
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* drm_pci_init - Register matching PCI devices with the DRM subsystem
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* @driver: DRM device driver
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* @pdriver: PCI device driver
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*
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* Initializes a drm_device structures, registering the stubs and initializing
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* the AGP device.
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
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{
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struct pci_dev *pdev = NULL;
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const struct pci_device_id *pid;
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int i;
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DRM_DEBUG("\n");
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if (driver->driver_features & DRIVER_MODESET)
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return pci_register_driver(pdriver);
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/* If not using KMS, fall back to stealth mode manual scanning. */
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INIT_LIST_HEAD(&driver->legacy_dev_list);
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for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
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pid = &pdriver->id_table[i];
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/* Loop around setting up a DRM device for each PCI device
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* matching our ID and device class. If we had the internal
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* function that pci_get_subsys and pci_get_class used, we'd
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* be able to just pass pid in instead of doing a two-stage
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* thing.
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*/
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pdev = NULL;
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while ((pdev =
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pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
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pid->subdevice, pdev)) != NULL) {
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if ((pdev->class & pid->class_mask) != pid->class)
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continue;
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/* stealth mode requires a manual probe */
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pci_dev_get(pdev);
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drm_get_pci_dev(pdev, pid, driver);
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}
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}
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return 0;
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}
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int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask)
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{
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struct pci_dev *root;
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u32 lnkcap, lnkcap2;
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*mask = 0;
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if (!dev->pdev)
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return -EINVAL;
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root = dev->pdev->bus->self;
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/* we've been informed via and serverworks don't make the cut */
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if (root->vendor == PCI_VENDOR_ID_VIA ||
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root->vendor == PCI_VENDOR_ID_SERVERWORKS)
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return -EINVAL;
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pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap);
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pcie_capability_read_dword(root, PCI_EXP_LNKCAP2, &lnkcap2);
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if (lnkcap2) { /* PCIe r3.0-compliant */
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if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB)
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*mask |= DRM_PCIE_SPEED_25;
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if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB)
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*mask |= DRM_PCIE_SPEED_50;
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if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB)
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*mask |= DRM_PCIE_SPEED_80;
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} else { /* pre-r3.0 */
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if (lnkcap & PCI_EXP_LNKCAP_SLS_2_5GB)
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*mask |= DRM_PCIE_SPEED_25;
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if (lnkcap & PCI_EXP_LNKCAP_SLS_5_0GB)
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*mask |= (DRM_PCIE_SPEED_25 | DRM_PCIE_SPEED_50);
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}
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DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2);
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return 0;
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}
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EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask);
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#else
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int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
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{
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return -1;
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}
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void drm_pci_agp_destroy(struct drm_device *dev) {}
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int drm_irq_by_busid(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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return -EINVAL;
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}
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int drm_pci_set_unique(struct drm_device *dev,
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struct drm_master *master,
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struct drm_unique *u)
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{
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return -EINVAL;
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}
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#endif
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EXPORT_SYMBOL(drm_pci_init);
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/**
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* drm_pci_exit - Unregister matching PCI devices from the DRM subsystem
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* @driver: DRM device driver
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* @pdriver: PCI device driver
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*
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* Unregisters one or more devices matched by a PCI driver from the DRM
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* subsystem.
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*/
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void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
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{
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struct drm_device *dev, *tmp;
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DRM_DEBUG("\n");
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if (driver->driver_features & DRIVER_MODESET) {
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pci_unregister_driver(pdriver);
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} else {
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list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list,
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legacy_dev_list) {
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list_del(&dev->legacy_dev_list);
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drm_put_dev(dev);
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}
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}
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DRM_INFO("Module unloaded\n");
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}
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EXPORT_SYMBOL(drm_pci_exit);
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