2 * Copyright (c) 2007 Paulo R. Zanoni, Tiago Vignatti
5 * Permission is hereby granted, free of charge, to any person
6 * obtaining a copy of this software and associated documentation
7 * files (the "Software"), to deal in the Software without
8 * restriction, including without limitation the rights to use,
9 * copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following
14 * The above copyright notice and this permission notice shall be
15 * included in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
19 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
21 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
22 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
24 * OTHER DEALINGS IN THE SOFTWARE.
36 #include "pciaccess.h"
37 #include "pciaccess_private.h"
42 parse_string_to_decodes_rsrc(char *input, int *vga_count, struct pci_slot_match *match)
45 char *input_sp = NULL, *count_sp, *pci_sp;
48 tok = strtok_r(input,",",&input_sp);
52 strncpy(tmp, input, 15);
55 tok = strtok_r(tmp,":",&count_sp);
58 tok = strtok_r(NULL, ":",&count_sp);
62 *vga_count = strtoul(tok, NULL, 10);
63 if (*vga_count == LONG_MAX)
67 fprintf(stderr,"vga count is %d\n", *vga_count);
70 tok = strtok_r(NULL, ",",&input_sp);
75 strncpy(tmp, tok, 32);
77 tok = strtok_r(tmp, ":", &pci_sp);
80 tok = strtok_r(NULL, ":", &pci_sp);
83 match->domain = strtoul(tok, NULL, 16);
85 tok = strtok_r(NULL, ":", &pci_sp);
88 match->bus = strtoul(tok, NULL, 16);
90 tok = strtok_r(NULL, ".", &pci_sp);
93 match->dev = strtoul(tok, NULL, 16);
95 tok = strtok_r(NULL, ".", &pci_sp);
98 match->func = strtoul(tok, NULL, 16);
101 tok = strtok_r(NULL, ",",&input_sp);
104 tok = strtok_r(tok, "=", &input_sp);
107 tok = strtok_r(NULL, "=", &input_sp);
111 if (!strncmp(tok, "io+mem", 6))
112 return VGA_ARB_RSRC_LEGACY_IO | VGA_ARB_RSRC_LEGACY_MEM;
113 if (!strncmp(tok, "io", 2))
114 return VGA_ARB_RSRC_LEGACY_IO;
115 if (!strncmp(tok, "mem", 3))
116 return VGA_ARB_RSRC_LEGACY_MEM;
118 return VGA_ARB_RSRC_NONE;
122 pci_device_vgaarb_init(void)
124 struct pci_slot_match match;
131 if ((pci_sys->vgaarb_fd = open ("/dev/vga_arbiter", O_RDWR)) < 0) {
135 ret = read(pci_sys->vgaarb_fd, buf, BUFSIZE);
139 memset(&match, 0xff, sizeof(match));
140 /* need to find the device to go back to and what it was decoding */
141 rsrc = parse_string_to_decodes_rsrc(buf, &pci_sys->vga_count, &match);
143 pci_sys->vga_default_dev = pci_device_find_by_slot(match.domain, match.bus, match.dev, match.func);
145 if (pci_sys->vga_default_dev)
146 pci_sys->vga_default_dev->vgaarb_rsrc = rsrc;
151 pci_device_vgaarb_fini(void)
156 close(pci_sys->vgaarb_fd);
160 * Writes message on vga device. The messages are defined by the kernel
163 * \param fd vga arbiter device.
164 * \param buf message itself.
165 * \param len message length.
168 * Zero on success, 1 if something gets wrong and 2 if fd is busy (only for
172 vgaarb_write(int fd, char *buf, int len)
179 ret = write(fd, buf, len);
181 /* the user may have called "trylock" and didn't get the lock */
186 fprintf(stderr, "write error");
190 else if (ret != len) {
191 /* it's need to receive the exactly amount required. */
193 fprintf(stderr, "write error: wrote different than expected\n");
199 fprintf(stderr, "%s: successfully wrote: '%s'\n", __FUNCTION__, buf);
207 rsrc_to_str(int iostate)
210 case VGA_ARB_RSRC_LEGACY_IO | VGA_ARB_RSRC_LEGACY_MEM:
212 case VGA_ARB_RSRC_LEGACY_IO:
214 case VGA_ARB_RSRC_LEGACY_MEM:
222 pci_device_vgaarb_set_target(struct pci_device *dev)
229 dev = pci_sys->vga_default_dev;
233 len = snprintf(buf, BUFSIZE, "target PCI:%04x:%02x:%02x.%x",
234 dev->domain, dev->bus, dev->dev, dev->func);
236 ret = vgaarb_write(pci_sys->vgaarb_fd, buf, len);
240 ret = read(pci_sys->vgaarb_fd, buf, BUFSIZE);
244 dev->vgaarb_rsrc = parse_string_to_decodes_rsrc(buf, &pci_sys->vga_count, NULL);
245 pci_sys->vga_target = dev;
250 pci_device_vgaarb_decodes(int new_vgaarb_rsrc)
255 struct pci_device *dev = pci_sys->vga_target;
259 if (dev->vgaarb_rsrc == new_vgaarb_rsrc)
262 len = snprintf(buf, BUFSIZE, "decodes %s", rsrc_to_str(dev->vgaarb_rsrc));
263 ret = vgaarb_write(pci_sys->vgaarb_fd, buf, len);
265 dev->vgaarb_rsrc = new_vgaarb_rsrc;
270 pci_device_vgaarb_lock(void)
274 struct pci_device *dev = pci_sys->vga_target;
279 if (dev->vgaarb_rsrc == 0 || pci_sys->vga_count == 1)
282 len = snprintf(buf, BUFSIZE, "lock %s", rsrc_to_str(dev->vgaarb_rsrc));
284 return vgaarb_write(pci_sys->vgaarb_fd, buf, len);
288 pci_device_vgaarb_trylock(void)
292 struct pci_device *dev = pci_sys->vga_target;
297 if (dev->vgaarb_rsrc == 0 || pci_sys->vga_count == 1)
300 len = snprintf(buf, BUFSIZE, "trylock %s", rsrc_to_str(dev->vgaarb_rsrc));
302 return vgaarb_write(pci_sys->vgaarb_fd, buf, len);
306 pci_device_vgaarb_unlock(void)
310 struct pci_device *dev = pci_sys->vga_target;
315 if (dev->vgaarb_rsrc == 0 || pci_sys->vga_count == 1)
318 len = snprintf(buf, BUFSIZE, "unlock %s", rsrc_to_str(dev->vgaarb_rsrc));
320 return vgaarb_write(pci_sys->vgaarb_fd, buf, len);
323 int pci_device_vgaarb_get_info(struct pci_device *dev, int *vga_count, int *rsrc_decodes)
325 *vga_count = pci_sys->vga_count;
329 *rsrc_decodes = dev->vgaarb_rsrc;