124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/*
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* This file contains the glue necessary for support of SGI's Altix chipset.
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*/
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#ifdef HAVE_XORG_CONFIG_H
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#include <xorg-config.h>
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#endif
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#include <stdio.h>
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#include <unistd.h>
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#include "altixPCI.h"
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#include "xf86.h"
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#include "Pci.h"
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/*
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* get_dev_on_bus - Return the first device we find on segnum, busnum
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*
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* Walk all the PCI devices and return the first one found on segnum, busnum.
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* There may be a better way to do this in some xf86* function I don't know
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* about.
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*/
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static pciDevice *get_dev_on_bus(unsigned int segnum, unsigned int busnum)
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{
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pciDevice **pdev = xf86scanpci(0);
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int i;
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for (i = 0; pdev[i] != NULL; i++)
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if (PCI_DOM_FROM_TAG(pdev[i]->tag) == segnum &&
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pdev[i]->busnum == busnum)
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return pdev[i];
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/* Should never get here... */
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ErrorF("No PCI device found on %04x:%02x??", segnum, busnum);
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return NULL;
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}
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/*
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* get_bridge_info - fill in the bridge info for bus_info based on pdev
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*
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* Find the parent bus for pdev if it exists, otherwise assume pdev *is*
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* the parent bus. We need this on Altix because our bridges are transparent.
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*/
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static void get_bridge_info(pciBusInfo_t *bus_info, pciDevice *pdev)
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{
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unsigned int parent_segnum, segnum = PCI_DOM_FROM_TAG(pdev->tag);
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unsigned int parent_busnum, parent_nodombus, busnum = pdev->busnum;
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unsigned int nodombus = PCI_BUS_NO_DOMAIN(PCI_BUS_FROM_TAG(pdev->tag));
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char bridge_path[] = "/sys/class/pci_bus/0000:00/bridge";
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char bridge_target[] = "../../../devices/pci0000:00";
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/* Path to this device's bridge */
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sprintf(bridge_path, "/sys/class/pci_bus/%04x:%02x/bridge", segnum,
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nodombus);
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if (readlink(bridge_path, bridge_target, strlen(bridge_target)) < 0) {
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perror("failed to dereference bridge link");
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ErrorF("failed to dereference bridge link, aborting\n");
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exit(-1);
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}
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sscanf(bridge_target, "../../../devices/pci%04x:%02x", &parent_segnum,
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&parent_nodombus);
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parent_busnum = PCI_MAKE_BUS(parent_segnum, parent_nodombus);
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/*
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* If there's no bridge or the bridge points to the device, use
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* pdev as the bridge
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*/
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if (segnum == parent_segnum && busnum == parent_busnum) {
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bus_info->bridge = pdev;
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bus_info->secondary = FALSE;
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bus_info->primary_bus = busnum;
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} else {
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bus_info->bridge = get_dev_on_bus(parent_segnum,
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parent_busnum);
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bus_info->secondary = TRUE;
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bus_info->primary_bus = parent_busnum;
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}
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pdev->businfo = bus_info;
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pdev->pci_base_class = PCI_CLASS_DISPLAY;
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pdev->pci_sub_class = PCI_SUBCLASS_PREHISTORIC_VGA;
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}
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void xf86PreScanAltix(void)
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{
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/* Nothing to see here... */
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}
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void xf86PostScanAltix(void)
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{
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pciConfigPtr *pdev;
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pciBusInfo_t *bus_info;
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int prevBusNum, curBusNum, idx;
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/*
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* Altix PCI bridges are invisible to userspace, so we make each device
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* look like it's its own bridge unless it actually has a parent (as in
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* the case of PCI to PCI bridges).
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*/
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bus_info = pciBusInfo[0];
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pdev = xf86scanpci(0);
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prevBusNum = curBusNum = pdev[0]->busnum;
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bus_info = pciBusInfo[curBusNum];
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bus_info->bridge = pdev[0];
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bus_info->secondary = FALSE;
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bus_info->primary_bus = curBusNum;
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/* Walk all the PCI devices, assigning their bridge info */
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for (idx = 0; pdev[idx] != NULL; idx++) {
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if (pdev[idx]->busnum == prevBusNum)
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continue; /* Already fixed up this bus */
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curBusNum = pdev[idx]->busnum;
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bus_info = pciBusInfo[curBusNum];
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/*
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* Fill in bus_info for pdev. The bridge field will either
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* be pdev[idx] or a device on the parent bus.
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*/
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get_bridge_info(bus_info, pdev[idx]);
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prevBusNum = curBusNum;
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}
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return;
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}
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