From e360c11c37a219534bfd7266caf163870dddced0 Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied@redhat.com>
Date: Mon, 20 Jul 2009 13:26:41 +1000
Subject: [PATCH] vgaarb: fixup api for new count reporting + decodes interface
 was wrong.

decodes is a information setting interface so it takes new decodes
and sends them to the kernel
---
 include/pciaccess.h     |  2 +-
 src/common_vgaarb.c     | 48 ++++++++++++++++++++++++++++++++++++++++++------
 src/pciaccess_private.h |  1 +
 3 files changed, 44 insertions(+), 7 deletions(-)

diff --git a/include/pciaccess.h b/include/pciaccess.h
index 13d92d7..9d68a08 100644
--- a/include/pciaccess.h
+++ b/include/pciaccess.h
@@ -497,7 +497,7 @@ struct pci_pcmcia_bridge_info {
 int  pci_device_vgaarb_init         (void);
 void pci_device_vgaarb_fini         (void);
 int  pci_device_vgaarb_set_target   (struct pci_device *dev);
-int  pci_device_vgaarb_decodes      (struct pci_device *dev);
+int  pci_device_vgaarb_decodes      (struct pci_device *dev, int new_vga_rsrc);
 int  pci_device_vgaarb_lock         (struct pci_device *dev);
 int  pci_device_vgaarb_trylock      (struct pci_device *dev);
 int  pci_device_vgaarb_unlock       (struct pci_device *dev);
diff --git a/src/common_vgaarb.c b/src/common_vgaarb.c
index 232d4ac..55b3868 100644
--- a/src/common_vgaarb.c
+++ b/src/common_vgaarb.c
@@ -30,11 +30,13 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <errno.h>
+#include <stdlib.h>
+#include <limits.h>
 
 #include "pciaccess.h"
 #include "pciaccess_private.h"
 
-#define BUFSIZE 32
+#define BUFSIZE 64
 
 int
 pci_device_vgaarb_init(void)
@@ -97,9 +99,28 @@ vgaarb_write(int fd, char *buf, int len)
 }
 
 static int
-parse_string_to_decodes_rsrc(char *input)
+parse_string_to_decodes_rsrc(char *input, int *vga_count)
 {
     char *tok;
+    char count[16];
+
+    strncpy(count, input, 10);
+    count[11] = 0;
+
+    tok = strtok(count,":");
+    if (!tok)
+	goto fail;
+    tok = strtok(NULL, "");
+    if (!tok)
+	goto fail;
+
+    *vga_count = strtoul(tok, NULL, 10);
+    if (*vga_count == LONG_MAX)
+	goto fail;
+
+#ifdef DEBUG
+    fprintf(stderr,"vga count is %d\n", *vga_count);
+#endif
 
     tok = strtok(input, ",");
     if (!tok)
@@ -158,19 +179,25 @@ pci_device_vgaarb_set_target(struct pci_device *dev)
     if (ret <= 0)
 	return -1;
 
-    dev->vgaarb_rsrc = parse_string_to_decodes_rsrc(buf);
+    dev->vgaarb_rsrc = parse_string_to_decodes_rsrc(buf, &pci_sys->vga_count);
     return 0;
 }
 
 int
-pci_device_vgaarb_decodes(struct pci_device *dev)
+pci_device_vgaarb_decodes(struct pci_device *dev, int new_vgaarb_rsrc)
 {
     int len;
     char buf[BUFSIZE];
+    int ret;
 
-    len = snprintf(buf, BUFSIZE, "decodes %s", rsrc_to_str(dev->vgaarb_rsrc));
+    if (dev->vgaarb_rsrc == new_vgaarb_rsrc)
+	return 0;
 
-    return vgaarb_write(pci_sys->vgaarb_fd, buf, len);
+    len = snprintf(buf, BUFSIZE, "decodes %s", rsrc_to_str(dev->vgaarb_rsrc));
+    ret = vgaarb_write(pci_sys->vgaarb_fd, buf, len);
+    if (ret == 0)
+        dev->vgaarb_rsrc = new_vgaarb_rsrc;
+    return ret;
 }
 
 int
@@ -179,6 +206,9 @@ pci_device_vgaarb_lock(struct pci_device *dev)
     int len;
     char buf[BUFSIZE];
 
+    if (dev->vgaarb_rsrc == 0 || pci_sys->vga_count == 1)
+        return 0;
+
     len = snprintf(buf, BUFSIZE, "lock %s", rsrc_to_str(dev->vgaarb_rsrc));
 
     return vgaarb_write(pci_sys->vgaarb_fd, buf, len);
@@ -190,6 +220,9 @@ pci_device_vgaarb_trylock(struct pci_device *dev)
     int len;
     char buf[BUFSIZE];
 
+    if (dev->vgaarb_rsrc == 0 || pci_sys->vga_count == 1)
+        return 0;
+
     len = snprintf(buf, BUFSIZE, "trylock %s", rsrc_to_str(dev->vgaarb_rsrc));
 
     return vgaarb_write(pci_sys->vgaarb_fd, buf, len);
@@ -201,6 +234,9 @@ pci_device_vgaarb_unlock(struct pci_device *dev)
     int len;
     char buf[BUFSIZE];
 
+    if (dev->vgaarb_rsrc == 0 || pci_sys->vga_count == 1)
+        return 0;
+
     len = snprintf(buf, BUFSIZE, "unlock %s", rsrc_to_str(dev->vgaarb_rsrc));
 
     return vgaarb_write(pci_sys->vgaarb_fd, buf, len);
diff --git a/src/pciaccess_private.h b/src/pciaccess_private.h
index a45fa8f..b97d31b 100644
--- a/src/pciaccess_private.h
+++ b/src/pciaccess_private.h
@@ -133,6 +133,7 @@ struct pci_system {
     int mtrr_fd;
 #endif
     int vgaarb_fd;
+    int vga_count;
 };
 
 extern struct pci_system * pci_sys;
-- 
2.11.0