LXR qemu/hw/i386/pci-assign-load-rom.c

   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 "hw/pci/pci-assign.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, struct Object *owner,
  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
  33    /* If loading ROM from file, pci handles it */
  34    if (dev->romfile || !dev->rom_bar) {
  35        return NULL;
  36    }
  37
  38    snprintf(rom_file, sizeof(rom_file),
  39             "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/rom",
  40             domain, bus, slot, function);
  41
  42    if (stat(rom_file, &st)) {
  43        return NULL;
  44    }
  45
  46    /* Write "1" to the ROM file to enable it */
  47    fp = fopen(rom_file, "r+");
  48    if (fp == NULL) {
  49        error_report("pci-assign: Cannot open %s: %s", rom_file, strerror(errno));
  50        return NULL;
  51    }
  52    val = 1;
  53    if (fwrite(&val, 1, 1, fp) != 1) {
  54        goto close_rom;
  55    }
  56    fseek(fp, 0, SEEK_SET);
  57
  58    snprintf(name, sizeof(name), "%s.rom", object_get_typename(owner));
  59    memory_region_init_ram(&dev->rom, owner, name, st.st_size, &error_abort);
  60    vmstate_register_ram(&dev->rom, &dev->qdev);
  61    ptr = memory_region_get_ram_ptr(&dev->rom);
  62    memset(ptr, 0xff, st.st_size);
  63
  64    if (!fread(ptr, 1, st.st_size, fp)) {
  65        error_report("pci-assign: Cannot read from host %s", rom_file);
  66        error_printf("Device option ROM contents are probably invalid "
  67                     "(check dmesg).\nSkip option ROM probe with rombar=0, "
  68                     "or load from file with romfile=\n");
  69        goto close_rom;
  70    }
  71
  72    pci_register_bar(dev, PCI_ROM_SLOT, 0, &dev->rom);
  73    dev->has_rom = true;
  74    *size = st.st_size;
  75close_rom:
  76    /* Write "0" to disable ROM */
  77    fseek(fp, 0, SEEK_SET);
  78    val = 0;
  79    if (!fwrite(&val, 1, 1, fp)) {
  80        DEBUG("%s\n", "Failed to disable pci-sysfs rom file");
  81    }
  82    fclose(fp);
  83
  84    return ptr;
  85}
  86