xref: /openbmc/qemu/hw/xen/xen_pt_load_rom.c (revision db725815985654007ade0fd53590d613fd657208)
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/i386/pc.h"
7 #include "qemu/error-report.h"
8 #include "ui/console.h"
9 #include "hw/loader.h"
10 #include "monitor/monitor.h"
11 #include "qemu/range.h"
12 #include "sysemu/sysemu.h"
13 #include "hw/pci/pci.h"
14 #include "xen_pt.h"
15 
16 /*
17  * Scan the assigned devices for the devices that have an option ROM, and then
18  * load the corresponding ROM data to RAM. If an error occurs while loading an
19  * option ROM, we just ignore that option ROM and continue with the next one.
20  */
21 void *pci_assign_dev_load_option_rom(PCIDevice *dev,
22                                      int *size, unsigned int domain,
23                                      unsigned int bus, unsigned int slot,
24                                      unsigned int function)
25 {
26     char name[32], rom_file[64];
27     FILE *fp;
28     uint8_t val;
29     struct stat st;
30     void *ptr = NULL;
31     Object *owner = OBJECT(dev);
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     /* Write "1" to the ROM file to enable it */
43     fp = fopen(rom_file, "r+");
44     if (fp == NULL) {
45         if (errno != ENOENT) {
46             error_report("pci-assign: Cannot open %s: %s", rom_file, strerror(errno));
47         }
48         return NULL;
49     }
50     if (fstat(fileno(fp), &st) == -1) {
51         error_report("pci-assign: Cannot stat %s: %s", rom_file, strerror(errno));
52         goto close_rom;
53     }
54 
55     val = 1;
56     if (fwrite(&val, 1, 1, fp) != 1) {
57         goto close_rom;
58     }
59     fseek(fp, 0, SEEK_SET);
60 
61     snprintf(name, sizeof(name), "%s.rom", object_get_typename(owner));
62     memory_region_init_ram(&dev->rom, owner, name, st.st_size, &error_abort);
63     ptr = memory_region_get_ram_ptr(&dev->rom);
64     memset(ptr, 0xff, st.st_size);
65 
66     if (!fread(ptr, 1, st.st_size, fp)) {
67         error_report("pci-assign: Cannot read from host %s", rom_file);
68         error_printf("Device option ROM contents are probably invalid "
69                      "(check dmesg).\nSkip option ROM probe with rombar=0, "
70                      "or load from file with romfile=\n");
71         goto close_rom;
72     }
73 
74     pci_register_bar(dev, PCI_ROM_SLOT, 0, &dev->rom);
75     dev->has_rom = true;
76     *size = st.st_size;
77 close_rom:
78     /* Write "0" to disable ROM */
79     fseek(fp, 0, SEEK_SET);
80     val = 0;
81     if (!fwrite(&val, 1, 1, fp)) {
82         XEN_PT_WARN(dev, "%s\n", "Failed to disable pci-sysfs rom file");
83     }
84     fclose(fp);
85 
86     return ptr;
87 }
88