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- libpciaccess-vga-arbiter.patch: add vga arbiter support to libpciaccess

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This commit is contained in:
Dave Airlie 2009-07-31 01:23:28 +00:00
parent 17519d2970
commit e312101c9a
2 changed files with 534 additions and 1 deletions
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528
libpciaccess-vga-arbiter.patch Normal file
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@ -0,0 +1,528 @@
diff --git a/include/pciaccess.h b/include/pciaccess.h
index 6413ae0..9d68a08 100644
--- a/include/pciaccess.h
+++ b/include/pciaccess.h
@@ -21,6 +21,31 @@
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
+/*
+ * Copyright (c) 2007 Paulo R. Zanoni, Tiago Vignatti
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
/**
* \file pciaccess.h
@@ -50,6 +75,8 @@ struct pci_slot_match;
extern "C" {
#endif
+int pci_device_has_kernel_driver(struct pci_device *dev);
+
int pci_device_is_boot_vga(struct pci_device *dev);
int pci_device_read_rom(struct pci_device *dev, void *buffer);
@@ -350,6 +377,11 @@ struct pci_device {
* the \c pci_device structure.
*/
intptr_t user_data;
+
+ /**
+ * Used by the VGA arbiter. Type of resource decoded by the device and
+ * the file descriptor (/dev/vga_arbiter). */
+ int vgaarb_rsrc;
};
@@ -449,4 +481,25 @@ struct pci_pcmcia_bridge_info {
};
+
+/**
+ * VGA Arbiter definitions, functions and related.
+ */
+
+/* Legacy VGA regions */
+#define VGA_ARB_RSRC_NONE 0x00
+#define VGA_ARB_RSRC_LEGACY_IO 0x01
+#define VGA_ARB_RSRC_LEGACY_MEM 0x02
+/* Non-legacy access */
+#define VGA_ARB_RSRC_NORMAL_IO 0x04
+#define VGA_ARB_RSRC_NORMAL_MEM 0x08
+
+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 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);
+
#endif /* PCIACCESS_H */
diff --git a/src/Makefile.am b/src/Makefile.am
index 14f2e48..0de6894 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -45,6 +45,12 @@ if SOLARIS
OS_SUPPORT = solx_devfs.c pci_tools.h
endif
+if LINUX
+VGA_ARBITER = common_vgaarb.c
+else
+VGA_ARBITER = common_vgaarb_stub.c
+endif
+
libpciaccess_la_SOURCES = common_bridge.c \
common_iterator.c \
common_init.c \
@@ -53,6 +59,7 @@ libpciaccess_la_SOURCES = common_bridge.c \
common_device_name.c \
common_map.c \
pciaccess_private.h \
+ $(VGA_ARBITER) \
$(OS_SUPPORT)
INCLUDES = -I$(top_srcdir)/include
diff --git a/src/common_interface.c b/src/common_interface.c
index 5dcc707..d46feab 100644
--- a/src/common_interface.c
+++ b/src/common_interface.c
@@ -124,6 +124,21 @@ pci_device_is_boot_vga( struct pci_device * dev )
}
/**
+ * Probe a PCI device to determine if a kernel driver is attached.
+ *
+ * \param dev Device to query
+ * \return
+ * Zero if no driver attached, 1 if attached kernel drviver
+ */
+int
+pci_device_has_kernel_driver( struct pci_device * dev )
+{
+ if (!pci_sys->methods->has_kernel_driver)
+ return 0;
+ return pci_sys->methods->has_kernel_driver( dev );
+}
+
+/**
* Probe a PCI device to learn information about the device.
*
* Probes a PCI device to learn various information about the device. Before
diff --git a/src/common_vgaarb.c b/src/common_vgaarb.c
new file mode 100644
index 0000000..302b89d
--- /dev/null
+++ b/src/common_vgaarb.c
@@ -0,0 +1,245 @@
+/*
+ * Copyright (c) 2007 Paulo R. Zanoni, Tiago Vignatti
+ * 2009 Tiago Vignatti
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <limits.h>
+
+#include "pciaccess.h"
+#include "pciaccess_private.h"
+
+#define BUFSIZE 64
+
+int
+pci_device_vgaarb_init(void)
+{
+ if ((pci_sys->vgaarb_fd = open ("/dev/vga_arbiter", O_RDWR)) < 0) {
+ return errno;
+ }
+
+ return 0;
+}
+
+void
+pci_device_vgaarb_fini(void)
+{
+ close(pci_sys->vgaarb_fd);
+}
+
+/**
+ * Writes message on vga device. The messages are defined by the kernel
+ * implementation.
+ *
+ * \param fd vga arbiter device.
+ * \param buf message itself.
+ * \param len message length.
+ *
+ * \return
+ * Zero on success, 1 if something gets wrong and 2 if fd is busy (only for
+ * 'trylock')
+ */
+static int
+vgaarb_write(int fd, char *buf, int len)
+{
+ int ret;
+
+
+ buf[len] = '\0';
+
+ ret = write(fd, buf, len);
+ if (ret == -1) {
+ /* the user may have called "trylock" and didn't get the lock */
+ if (errno == EBUSY)
+ return 2;
+
+#ifdef DEBUG
+ fprintf(stderr, "write error");
+#endif
+ return 1;
+ }
+ else if (ret != len) {
+ /* it's need to receive the exactly amount required. */
+#ifdef DEBUG
+ fprintf(stderr, "write error: wrote different than expected\n");
+#endif
+ return 1;
+ }
+
+#ifdef DEBUG
+ fprintf(stderr, "%s: successfully wrote: '%s'\n", __FUNCTION__, buf);
+#endif
+
+ return 0;
+}
+
+static int
+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)
+ goto fail;
+
+ tok = strtok(NULL, ",");
+ if (!tok)
+ goto fail;
+ tok = strtok(tok, "=");
+ if (!tok)
+ goto fail;
+ tok = strtok(NULL, "=");
+ if (!tok)
+ goto fail;
+
+ if (!strncmp(tok, "io+mem", 6))
+ return VGA_ARB_RSRC_LEGACY_IO | VGA_ARB_RSRC_LEGACY_MEM;
+ if (!strncmp(tok, "io", 2))
+ return VGA_ARB_RSRC_LEGACY_IO;
+ if (!strncmp(tok, "mem", 3))
+ return VGA_ARB_RSRC_LEGACY_MEM;
+fail:
+ return VGA_ARB_RSRC_NONE;
+}
+
+static const char *
+rsrc_to_str(int iostate)
+{
+ switch (iostate) {
+ case VGA_ARB_RSRC_LEGACY_IO | VGA_ARB_RSRC_LEGACY_MEM:
+ return "io+mem";
+ case VGA_ARB_RSRC_LEGACY_IO:
+ return "io";
+ case VGA_ARB_RSRC_LEGACY_MEM:
+ return "mem";
+ }
+
+ return "none";
+}
+
+int
+pci_device_vgaarb_set_target(struct pci_device *dev)
+{
+ int len;
+ char buf[BUFSIZE];
+ int ret;
+
+ len = snprintf(buf, BUFSIZE, "target PCI:%d:%d:%d.%d",
+ dev->domain, dev->bus, dev->dev, dev->func);
+
+ ret = vgaarb_write(pci_sys->vgaarb_fd, buf, len);
+ if (ret)
+ return ret;
+
+ ret = read(pci_sys->vgaarb_fd, buf, BUFSIZE);
+ if (ret <= 0)
+ return -1;
+
+ dev->vgaarb_rsrc = parse_string_to_decodes_rsrc(buf, &pci_sys->vga_count);
+ return 0;
+}
+
+int
+pci_device_vgaarb_decodes(struct pci_device *dev, int new_vgaarb_rsrc)
+{
+ int len;
+ char buf[BUFSIZE];
+ int ret;
+
+ if (dev->vgaarb_rsrc == new_vgaarb_rsrc)
+ return 0;
+
+ 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
+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);
+}
+
+int
+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);
+}
+
+int
+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/common_vgaarb_stub.c b/src/common_vgaarb_stub.c
new file mode 100644
index 0000000..5fc5dfe
--- /dev/null
+++ b/src/common_vgaarb_stub.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2009 Tiago Vignatti
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include <stdio.h>
+#include "pciaccess.h"
+
+int
+pci_device_vgaarb_init(struct pci_device *dev)
+{
+#ifdef DEBUG
+ fprintf(stderr, "%s: You're using VGA arbiter stub functions!\n",
+ __FUNCTION__);
+#endif
+ return 0;
+}
+
+void
+pci_device_vgaarb_fini(struct pci_device *dev)
+{
+}
+
+int
+pci_device_vgaarb_set_target(struct pci_device *dev)
+{
+ return 0;
+}
+
+int
+pci_device_vgaarb_decodes(struct pci_device *dev)
+{
+ return 0;
+}
+
+int
+pci_device_vgaarb_lock(struct pci_device *dev)
+{
+ return 0;
+}
+
+int
+pci_device_vgaarb_trylock(struct pci_device *dev)
+{
+ return 0;
+}
+
+int
+pci_device_vgaarb_unlock(struct pci_device *dev)
+{
+ return 0;
+}
diff --git a/src/linux_sysfs.c b/src/linux_sysfs.c
index 1ae9e52..65e1cf6 100644
--- a/src/linux_sysfs.c
+++ b/src/linux_sysfs.c
@@ -76,6 +76,7 @@ static int pci_device_linux_sysfs_write( struct pci_device * dev,
pciaddr_t * bytes_written );
static int pci_device_linux_sysfs_boot_vga( struct pci_device * dev );
+static int pci_device_linux_sysfs_has_kernel_driver(struct pci_device *dev);
static const struct pci_system_methods linux_sysfs_methods = {
.destroy = NULL,
@@ -91,6 +92,7 @@ static const struct pci_system_methods linux_sysfs_methods = {
.fill_capabilities = pci_fill_capabilities_generic,
.enable = pci_device_linux_sysfs_enable,
.boot_vga = pci_device_linux_sysfs_boot_vga,
+ .has_kernel_driver = pci_device_linux_sysfs_has_kernel_driver,
};
#define SYS_BUS_PCI "/sys/bus/pci/devices"
@@ -729,3 +731,22 @@ out:
close(fd);
return ret;
}
+
+static int pci_device_linux_sysfs_has_kernel_driver(struct pci_device *dev)
+{
+ char name[256];
+ struct stat dummy;
+ int ret;
+
+ snprintf( name, 255, "%s/%04x:%02x:%02x.%1u/driver",
+ SYS_BUS_PCI,
+ dev->domain,
+ dev->bus,
+ dev->dev,
+ dev->func );
+
+ ret = stat(name, &dummy);
+ if (ret < 0)
+ return 0;
+ return 1;
+}
diff --git a/src/pciaccess_private.h b/src/pciaccess_private.h
index 769e181..b97d31b 100644
--- a/src/pciaccess_private.h
+++ b/src/pciaccess_private.h
@@ -61,6 +61,7 @@ struct pci_system_methods {
int (*fill_capabilities)( struct pci_device * dev );
void (*enable)( struct pci_device *dev );
int (*boot_vga)( struct pci_device *dev );
+ int (*has_kernel_driver)( struct pci_device *dev );
};
struct pci_device_mapping {
@@ -131,6 +132,8 @@ struct pci_system {
#ifdef HAVE_MTRR
int mtrr_fd;
#endif
+ int vgaarb_fd;
+ int vga_count;
};
extern struct pci_system * pci_sys;

7
libpciaccess.spec
View File

@ -3,7 +3,7 @@
Name: libpciaccess
Version: 0.10.6
Release: 1%{?dist}
Release: 2%{?dist}
Summary: PCI access library
Group: System Environment/Libraries
@ -20,6 +20,7 @@ BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
Patch0: libpciaccess-fd-cache.patch
Patch2: libpciaccess-rom-size.patch
Patch3: libpciaccess-boot-vga.patch
Patch4: libpciaccess-vga-arbiter.patch
BuildRequires: autoconf automake libtool pkgconfig
Requires: hwdata
@ -42,6 +43,7 @@ Development package for libpciaccess.
%patch0 -p1 -b .cache
%patch2 -p1 -b .rom-size
%patch3 -p1 -b .bootvga
%patch4 -p1 -b .vgaarb
%build
#autoreconf -v --install
@ -72,6 +74,9 @@ rm -rf $RPM_BUILD_ROOT
%{_libdir}/pkgconfig/pciaccess.pc
%changelog
* Fri Jul 31 2009 Dave Airlie <airlied@redhat.com> 0.10.6-2
- libpciaccess-vga-arbiter.patch: add vga arbiter support to libpciaccess
* Mon Jul 27 2009 Dave Airlie <airlied@redhat.com> 0.10.6-1
- rebase to latest release (will do release with VGA bits later)
- libpciaccess-boot-vga.patch: add boot vga patch from upstream