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fe8e65ae3d
Using M_NOWAIT could lead to transient failures with ioctls. Suggested by: kib
493 lines
12 KiB
C
493 lines
12 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 <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <dev/drm2/drmP.h>
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static int drm_msi = 1; /* Enable by default. */
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SYSCTL_NODE(_hw, OID_AUTO, drm, CTLFLAG_RW, NULL, "DRM device");
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SYSCTL_INT(_hw_drm, OID_AUTO, msi, CTLFLAG_RDTUN, &drm_msi, 1,
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"Enable MSI interrupts for drm devices");
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/**********************************************************************/
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/** \name PCI memory */
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/*@{*/
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static void
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drm_pci_busdma_callback(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
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{
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drm_dma_handle_t *dmah = arg;
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if (error != 0)
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return;
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KASSERT(nsegs == 1, ("drm_pci_busdma_callback: bad dma segment count"));
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dmah->busaddr = segs[0].ds_addr;
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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,
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size_t align, dma_addr_t maxaddr)
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{
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drm_dma_handle_t *dmah;
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int ret;
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/* Need power-of-two alignment, so fail the allocation if it isn't. */
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if ((align & (align - 1)) != 0) {
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DRM_ERROR("drm_pci_alloc with non-power-of-two alignment %d\n",
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(int)align);
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return NULL;
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}
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dmah = malloc(sizeof(drm_dma_handle_t), DRM_MEM_DMA, M_ZERO | M_NOWAIT);
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if (dmah == NULL)
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return NULL;
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/* Make sure we aren't holding mutexes here */
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mtx_assert(&dev->dma_lock, MA_NOTOWNED);
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if (mtx_owned(&dev->dma_lock))
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DRM_ERROR("called while holding dma_lock\n");
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ret = bus_dma_tag_create(
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bus_get_dma_tag(dev->dev), /* parent */
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align, 0, /* align, boundary */
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maxaddr, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */
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NULL, NULL, /* filtfunc, filtfuncargs */
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size, 1, size, /* maxsize, nsegs, maxsegsize */
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0, NULL, NULL, /* flags, lockfunc, lockfuncargs */
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&dmah->tag);
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if (ret != 0) {
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free(dmah, DRM_MEM_DMA);
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return NULL;
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}
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ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr,
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BUS_DMA_WAITOK | BUS_DMA_ZERO | BUS_DMA_NOCACHE, &dmah->map);
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if (ret != 0) {
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bus_dma_tag_destroy(dmah->tag);
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free(dmah, DRM_MEM_DMA);
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return NULL;
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}
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ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr, size,
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drm_pci_busdma_callback, dmah, BUS_DMA_NOWAIT);
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if (ret != 0) {
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bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
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bus_dma_tag_destroy(dmah->tag);
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free(dmah, DRM_MEM_DMA);
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return NULL;
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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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* \brief 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_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
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{
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if (dmah == NULL)
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return;
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bus_dmamap_unload(dmah->tag, dmah->map);
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bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
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bus_dma_tag_destroy(dmah->tag);
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}
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/**
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* \brief Free a PCI consistent 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_pci_free(dev, dmah);
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free(dmah, DRM_MEM_DMA);
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}
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EXPORT_SYMBOL(drm_pci_free);
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static int drm_get_pci_domain(struct drm_device *dev)
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{
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return dev->pci_domain;
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}
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static int drm_pci_get_irq(struct drm_device *dev)
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{
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if (dev->irqr)
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return (dev->irq);
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dev->irqr = bus_alloc_resource_any(dev->dev, SYS_RES_IRQ,
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&dev->irqrid, RF_SHAREABLE);
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if (!dev->irqr) {
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dev_err(dev->dev, "Failed to allocate IRQ\n");
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return (0);
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}
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dev->irq = (int) rman_get_start(dev->irqr);
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return (dev->irq);
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}
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static void drm_pci_free_irq(struct drm_device *dev)
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{
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if (dev->irqr == NULL)
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return;
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bus_release_resource(dev->dev, SYS_RES_IRQ,
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dev->irqrid, dev->irqr);
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dev->irqr = NULL;
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dev->irq = 0;
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}
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static const char *drm_pci_get_name(struct drm_device *dev)
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{
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return dev->driver->name;
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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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int len, ret;
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master->unique_len = 40;
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master->unique_size = master->unique_len;
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master->unique = malloc(master->unique_size, DRM_MEM_DRIVER, M_NOWAIT);
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if (master->unique == NULL)
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return -ENOMEM;
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len = snprintf(master->unique, master->unique_len,
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"pci:%04x:%02x:%02x.%d",
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dev->pci_domain,
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dev->pci_bus,
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dev->pci_slot,
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dev->pci_func);
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if (len >= master->unique_len) {
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DRM_ERROR("buffer overflow");
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ret = -EINVAL;
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goto err;
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} else
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master->unique_len = len;
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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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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_size = u->unique_len + 1;
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master->unique = malloc(master->unique_size, DRM_MEM_DRIVER, M_WAITOK);
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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 != dev->pci_domain) ||
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(bus != dev->pci_bus) ||
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(slot != dev->pci_slot) ||
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(func != dev->pci_func)) {
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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->pci_bus ||
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p->devnum != dev->pci_slot || p->funcnum != dev->pci_func)
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return -EINVAL;
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p->irq = dev->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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int drm_pci_agp_init(struct drm_device *dev)
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{
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if (drm_core_has_AGP(dev)) {
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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 (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
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&& (dev->agp == NULL)) {
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DRM_ERROR("Cannot initialize the agpgart module.\n");
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return -EINVAL;
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}
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if (drm_core_has_MTRR(dev)) {
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if (dev->agp && dev->agp->agp_info.ai_aperture_base != 0) {
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if (drm_mtrr_add(dev->agp->agp_info.ai_aperture_base,
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dev->agp->agp_info.ai_aperture_size, DRM_MTRR_WC) == 0)
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dev->agp->agp_mtrr = 1;
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else
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dev->agp->agp_mtrr = -1;
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}
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}
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}
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return 0;
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}
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static struct drm_bus drm_pci_bus = {
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.bus_type = DRIVER_BUS_PCI,
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.get_irq = drm_pci_get_irq,
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.free_irq = drm_pci_free_irq,
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.get_name = drm_pci_get_name,
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.set_busid = drm_pci_set_busid,
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.set_unique = drm_pci_set_unique,
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.irq_by_busid = drm_pci_irq_by_busid,
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.agp_init = drm_pci_agp_init,
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};
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/**
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* Register.
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*
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* \param pdev - PCI device structure
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* \param ent entry from the PCI ID table with device type flags
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* \return zero on success or a negative number on failure.
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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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int drm_get_pci_dev(device_t kdev, struct drm_device *dev,
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struct drm_driver *driver)
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{
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int ret;
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DRM_DEBUG("\n");
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driver->bus = &drm_pci_bus;
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dev->dev = kdev;
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dev->pci_domain = pci_get_domain(dev->dev);
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dev->pci_bus = pci_get_bus(dev->dev);
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dev->pci_slot = pci_get_slot(dev->dev);
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dev->pci_func = pci_get_function(dev->dev);
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dev->pci_vendor = pci_get_vendor(dev->dev);
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dev->pci_device = pci_get_device(dev->dev);
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dev->pci_subvendor = pci_get_subvendor(dev->dev);
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dev->pci_subdevice = pci_get_subdevice(dev->dev);
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sx_xlock(&drm_global_mutex);
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if ((ret = drm_fill_in_dev(dev, driver))) {
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DRM_ERROR("Failed to fill in dev: %d\n", ret);
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goto err_g1;
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}
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if (drm_core_check_feature(dev, DRIVER_MODESET)) {
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ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
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if (ret)
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goto err_g2;
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}
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if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
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goto err_g3;
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if (dev->driver->load) {
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ret = dev->driver->load(dev,
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dev->id_entry->driver_private);
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if (ret)
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goto err_g4;
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}
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/* setup the grouping for the legacy output */
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if (drm_core_check_feature(dev, DRIVER_MODESET)) {
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ret = drm_mode_group_init_legacy_group(dev,
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&dev->primary->mode_group);
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if (ret)
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goto err_g5;
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}
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#ifdef FREEBSD_NOTYET
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list_add_tail(&dev->driver_item, &driver->device_list);
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#endif /* FREEBSD_NOTYET */
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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, device_get_nameunit(dev->dev), dev->primary->index);
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sx_xunlock(&drm_global_mutex);
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return 0;
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err_g5:
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if (dev->driver->unload)
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dev->driver->unload(dev);
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err_g4:
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drm_put_minor(&dev->primary);
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err_g3:
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if (drm_core_check_feature(dev, DRIVER_MODESET))
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drm_put_minor(&dev->control);
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err_g2:
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drm_cancel_fill_in_dev(dev);
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err_g1:
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sx_xunlock(&drm_global_mutex);
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return ret;
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}
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EXPORT_SYMBOL(drm_get_pci_dev);
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int
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drm_pci_enable_msi(struct drm_device *dev)
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{
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int msicount, ret;
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if (!drm_msi)
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return (-ENOENT);
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msicount = pci_msi_count(dev->dev);
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DRM_DEBUG("MSI count = %d\n", msicount);
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if (msicount > 1)
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msicount = 1;
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ret = pci_alloc_msi(dev->dev, &msicount);
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if (ret == 0) {
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DRM_INFO("MSI enabled %d message(s)\n", msicount);
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dev->msi_enabled = 1;
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dev->irqrid = 1;
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}
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return (-ret);
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}
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void
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drm_pci_disable_msi(struct drm_device *dev)
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{
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if (!dev->msi_enabled)
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return;
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pci_release_msi(dev->dev);
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dev->msi_enabled = 0;
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dev->irqrid = 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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device_t root;
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int pos;
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u32 lnkcap = 0, lnkcap2 = 0;
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*mask = 0;
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if (!drm_pci_device_is_pcie(dev))
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return -EINVAL;
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root =
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device_get_parent( /* pcib */
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device_get_parent( /* `-- pci */
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device_get_parent( /* `-- vgapci */
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dev->dev))); /* `-- drmn */
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pos = 0;
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pci_find_cap(root, PCIY_EXPRESS, &pos);
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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 (pci_get_vendor(root) == PCI_VENDOR_ID_VIA ||
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pci_get_vendor(root) == PCI_VENDOR_ID_SERVERWORKS)
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return -EINVAL;
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lnkcap = pci_read_config(root, pos + PCIER_LINK_CAP, 4);
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lnkcap2 = pci_read_config(root, pos + PCIER_LINK_CAP2, 4);
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lnkcap &= PCIEM_LINK_CAP_MAX_SPEED;
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lnkcap2 &= 0xfe;
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#define PCI_EXP_LNKCAP2_SLS_2_5GB 0x02 /* Supported Link Speed 2.5GT/s */
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#define PCI_EXP_LNKCAP2_SLS_5_0GB 0x04 /* Supported Link Speed 5.0GT/s */
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#define PCI_EXP_LNKCAP2_SLS_8_0GB 0x08 /* Supported Link Speed 8.0GT/s */
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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", pci_get_vendor(root), pci_get_device(root), 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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