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v3.11.0
lib/proc.c
230 строк
5 KB
Martin Mares
Get rid of workarounds for Linux systems without pread/pwrite
29 дек 2023, 17:27
29 дек 2023, 17:27
30e9f21
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/* * The PCI Library -- Configuration Access via /proc/bus/pci * * Copyright (c) 1997--2023 Martin Mares <mj@ucw.cz> * * Can be freely distributed and used under the terms of the GNU GPL v2+. * * SPDX-License-Identifier: GPL-2.0-or-later */ #define _GNU_SOURCE #include <stdio.h> #include <string.h> #include <unistd.h> #include <ctype.h> #include <errno.h> #include <fcntl.h> #include <sys/types.h> #include "internal.h" static void proc_config(struct pci_access *a) { pci_define_param(a, "proc.path", PCI_PATH_PROC_BUS_PCI, "Path to the procfs bus tree"); } static int proc_detect(struct pci_access *a) { char *name = pci_get_param(a, "proc.path"); if (access(name, R_OK)) { a->warning("Cannot open %s", name); return 0; } a->debug("...using %s", name); return 1; } static void proc_init(struct pci_access *a) { a->fd = -1; } static void proc_cleanup(struct pci_access *a) { if (a->fd >= 0) { close(a->fd); a->fd = -1; } } static void proc_scan(struct pci_access *a) { FILE *f; char buf[512]; if (snprintf(buf, sizeof(buf), "%s/devices", pci_get_param(a, "proc.path")) == sizeof(buf)) a->error("File name too long"); f = fopen(buf, "r"); if (!f) a->error("Cannot open %s", buf); while (fgets(buf, sizeof(buf)-1, f)) { struct pci_dev *d = pci_alloc_dev(a); unsigned int dfn, vend, cnt, known; char *driver; int offset; #define F " " PCIADDR_T_FMT cnt = sscanf(buf, "%x %x %x" F F F F F F F F F F F F F F "%n", &dfn, &vend, &d->irq, &d->base_addr[0], &d->base_addr[1], &d->base_addr[2], &d->base_addr[3], &d->base_addr[4], &d->base_addr[5], &d->rom_base_addr, &d->size[0], &d->size[1], &d->size[2], &d->size[3], &d->size[4], &d->size[5], &d->rom_size, &offset); #undef F if (cnt != 9 && cnt != 10 && cnt != 17) a->error("proc: parse error (read only %d items)", cnt); d->bus = dfn >> 8U; d->dev = PCI_SLOT(dfn & 0xff); d->func = PCI_FUNC(dfn & 0xff); d->vendor_id = vend >> 16U; d->device_id = vend & 0xffff; known = 0; if (!a->buscentric) { known |= PCI_FILL_IDENT | PCI_FILL_IRQ | PCI_FILL_BASES; if (cnt >= 10) known |= PCI_FILL_ROM_BASE; if (cnt >= 17) known |= PCI_FILL_SIZES; } if (cnt >= 17) { while (buf[offset] && isspace(buf[offset])) ++offset; driver = &buf[offset]; while (buf[offset] && !isspace(buf[offset])) ++offset; buf[offset] = '\0'; if (driver[0]) { pci_set_property(d, PCI_FILL_DRIVER, driver); known |= PCI_FILL_DRIVER; } } d->known_fields = known; pci_link_dev(a, d); } fclose(f); } static int proc_setup(struct pci_dev *d, int rw) { struct pci_access *a = d->access; if (a->cached_dev != d || a->fd_rw < rw) { char buf[1024]; int e; if (a->fd >= 0) close(a->fd); e = snprintf(buf, sizeof(buf), "%s/%02x/%02x.%d", pci_get_param(a, "proc.path"), d->bus, d->dev, d->func); if (e < 0 || e >= (int) sizeof(buf)) a->error("File name too long"); a->fd_rw = a->writeable || rw; a->fd = open(buf, a->fd_rw ? O_RDWR : O_RDONLY); if (a->fd < 0) { e = snprintf(buf, sizeof(buf), "%s/%04x:%02x/%02x.%d", pci_get_param(a, "proc.path"), d->domain, d->bus, d->dev, d->func); if (e < 0 || e >= (int) sizeof(buf)) a->error("File name too long"); a->fd = open(buf, a->fd_rw ? O_RDWR : O_RDONLY); } if (a->fd < 0) a->warning("Cannot open %s", buf); a->cached_dev = d; } return a->fd; } static int proc_read(struct pci_dev *d, int pos, byte *buf, int len) { int fd = proc_setup(d, 0); int res; if (fd < 0) return 0; res = pread(fd, buf, len, pos); if (res < 0) { d->access->warning("proc_read: read failed: %s", strerror(errno)); return 0; } else if (res != len) return 0; return 1; } static int proc_write(struct pci_dev *d, int pos, byte *buf, int len) { int fd = proc_setup(d, 1); int res; if (fd < 0) return 0; res = pwrite(fd, buf, len, pos); if (res < 0) { d->access->warning("proc_write: write failed: %s", strerror(errno)); return 0; } else if (res != len) { d->access->warning("proc_write: tried to write %d bytes at %d, but only %d succeeded", len, pos, res); return 0; } return 1; } static void proc_cleanup_dev(struct pci_dev *d) { if (d->access->cached_dev == d) d->access->cached_dev = NULL; } struct pci_methods pm_linux_proc = { "linux-proc", "The proc file system on Linux", proc_config, proc_detect, proc_init, proc_cleanup, proc_scan, pci_generic_fill_info, proc_read, proc_write, NULL, /* read_vpd */ NULL, /* init_dev */ proc_cleanup_dev };