LXR qemu/hw/xen/xen_pt_load

   1/*
   2 * This is splited from hw/i386/kvm/pci-assign.c
   3 */
   4#include "qemu/osdep.h"
   5#include "qapi/error.h"
   6#include "hw/hw.h"
   7#include "hw/i386/pc.h"
   8#include "qemu/error-report.h"
   9#include "ui/console.h"
  10#include "hw/loader.h"
  11#include "monitor/monitor.h"
  12#include "qemu/range.h"
  13#include "sysemu/sysemu.h"
  14#include "hw/pci/pci.h"
  15#include "xen_pt.h"
  16
  17/*
  18 * Scan the assigned devices for the devices that have an option ROM, and then
  19 * load the corresponding ROM data to RAM. If an error occurs while loading an
  20 * option ROM, we just ignore that option ROM and continue with the next one.
  21 */
  22void *pci_assign_dev_load_option_rom(PCIDevice *dev,
  23                                     int *size, unsigned int domain,
  24                                     unsigned int bus, unsigned int slot,
  25                                     unsigned int function)
  26{
  27    char name[32], rom_file[64];
  28    FILE *fp;
  29    uint8_t val;
  30    struct stat st;
  31    void *ptr = NULL;
  32    Object *owner = OBJECT(dev);
  33
  34    /* If loading ROM from file, pci handles it */
  35    if (dev->romfile || !dev->rom_bar) {
  36        return NULL;
  37    }
  38
  39    snprintf(rom_file, sizeof(rom_file),
  40             "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/rom",
  41             domain, bus, slot, function);
  42
  43    /* Write "1" to the ROM file to enable it */
  44    fp = fopen(rom_file, "r+");
  45    if (fp == NULL) {
  46        if (errno != ENOENT) {
  47            error_report("pci-assign: Cannot open %s: %s", rom_file, strerror(errno));
  48        }
  49        return NULL;
  50    }
  51    if (fstat(fileno(fp), &st) == -1) {
  52        error_report("pci-assign: Cannot stat %s: %s", rom_file, strerror(errno));
  53        goto close_rom;
  54    }
  55
  56    val = 1;
  57    if (fwrite(&val, 1, 1, fp) != 1) {
  58        goto close_rom;
  59    }
  60    fseek(fp, 0, SEEK_SET);
  61
  62    snprintf(name, sizeof(name), "%s.rom", object_get_typename(owner));
  63    memory_region_init_ram(&dev->rom, owner, name, st.st_size, &error_abort);
  64    ptr = memory_region_get_ram_ptr(&dev->rom);
  65    memset(ptr, 0xff, st.st_size);
  66
  67    if (!fread(ptr, 1, st.st_size, fp)) {
  68        error_report("pci-assign: Cannot read from host %s", rom_file);
  69        error_printf("Device option ROM contents are probably invalid "
  70                     "(check dmesg).\nSkip option ROM probe with rombar=0, "
  71                     "or load from file with romfile=\n");
  72        goto close_rom;
  73    }
  74
  75    pci_register_bar(dev, PCI_ROM_SLOT, 0, &dev->rom);
  76    dev->has_rom = true;
  77    *size = st.st_size;
  78close_rom:
  79    /* Write "0" to disable ROM */
  80    fseek(fp, 0, SEEK_SET);
  81    val = 0;
  82    if (!fwrite(&val, 1, 1, fp)) {
  83        XEN_PT_WARN(dev, "%s\n", "Failed to disable pci-sysfs rom file");
  84    }
  85    fclose(fp);
  86
  87    return ptr;
  88}
  89