141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
/* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-c -*- */
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/**
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* \file drm_pci.c
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* \brief Functions and ioctls to manage PCI memory
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*
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* \warning These interfaces aren't stable yet.
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*
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* \todo Implement the remaining ioctl's for the PCI pools.
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* \todo The wrappers here are so thin that they would be better off inlined..
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*
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* \author José Fonseca <jrfonseca@tungstengraphics.com>
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* \author Leif Delgass <ldelgass@retinalburn.net>
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*/
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/*
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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 <syscall.h>
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/**********************************************************************/
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/** \name PCI memory */
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/*@{*/
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/**
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* \brief Allocate a PCI consistent memory block, for DMA.
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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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#if 1
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unsigned long addr;
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size_t sz;
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#endif
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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 = (void*)KernelAlloc(size);
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dmah->busaddr = GetPgAddr(dmah->vaddr);
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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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return dmah;
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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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int pos;
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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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if (!pci_is_pcie(dev->pdev))
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return -EINVAL;
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return -EINVAL;
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#if 0
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root = dev->pdev->bus->self;
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pos = pci_pcie_cap(root);
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if (!pos)
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return -EINVAL;
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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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pci_read_config_dword(root, pos + PCI_EXP_LNKCAP, &lnkcap);
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pci_read_config_dword(root, pos + PCI_EXP_LNKCAP2, &lnkcap2);
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lnkcap &= PCI_EXP_LNKCAP_SLS;
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lnkcap2 &= 0xfe;
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if (lnkcap2) { /* PCIE GEN 3.0 */
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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 {
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if (lnkcap & 1)
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*mask |= DRM_PCIE_SPEED_25;
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if (lnkcap & 2)
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*mask |= 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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#endif
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}
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EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask);
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