OpenBSD support for libpciaccess.

xserver and libpciaccess both need to open /dev/xf86, which can only
be opened once.  I implemented pci_system_init_dev_mem() like Ian
suggested.  This requires some minor changes to the BSD-specific
os-support code.  Since pci_system_init_dev_mem() is a no-op on
FreeBSD this should be no problem.

6 files changed, 431 insertions, 3 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index f370920..f60ccbd 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -33,6 +33,10 @@ if FREEBSD
 OS_SUPPORT = freebsd_pci.c
 endif
 
+if OPENBSD
+OS_SUPPORT = openbsd_pci.c
+endif
+
 if SOLARIS
 OS_SUPPORT = solx_devfs.c pci_tools.h
 endif
diff --git a/src/common_init.c b/src/common_init.c
index 1092faf..7429518 100644
--- a/src/common_init.c
+++ b/src/common_init.c
@@ -56,13 +56,22 @@ pci_system_init( void )
     err = pci_system_linux_sysfs_create();
 #elif defined(__FreeBSD__)
     err = pci_system_freebsd_create();
+#elif defined(__OpenBSD__)
+    err = pci_system_openbsd_create();
 #elif defined(__sun)
-	err = pci_system_solx_devfs_create();
+    err = pci_system_solx_devfs_create();
 #endif
 
     return err;
 }
 
+void
+pci_system_init_dev_mem(int fd)
+{
+#ifdef __OpenBSD__
+    pci_system_openbsd_init_dev_mem(fd);
+#endif
+}
 
 /**
  * Shutdown all access to the PCI subsystem.
diff --git a/src/common_interface.c b/src/common_interface.c
index 7fae277..d7e4b62 100644
--- a/src/common_interface.c
+++ b/src/common_interface.c
@@ -61,11 +61,17 @@
 
 #include <sys/endian.h>
 
-#define LETOH_16(x)	le16toh(x)
 #define HTOLE_16(x)	htole16(x)
-#define LETOH_32(x)	le32toh(x)
 #define HTOLE_32(x)	htole32(x)
 
+#ifdef __FreeBSD__
+#define LETOH_16(x)	le16toh(x)
+#define LETOH_32(x)	le32toh(x)
+#else
+#define LETOH_16(x)	letoh16(x)
+#define LETOH_32(x)	letoh32(x)
+#endif
+
 #endif /* others */
 
 /**
diff --git a/src/common_map.c b/src/common_map.c
index ac1c668..8757151 100644
--- a/src/common_map.c
+++ b/src/common_map.c
@@ -22,6 +22,7 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
+#include <sys/types.h>
 #include <sys/mman.h>
 #include <errno.h>
 
diff --git a/src/openbsd_pci.c b/src/openbsd_pci.c
new file mode 100644
index 0000000..5c06b47
--- /dev/null
+++ b/src/openbsd_pci.c
@@ -0,0 +1,406 @@
+/*
+ * Copyright (c) 2008 Mark Kettenis
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/param.h>
+#include <sys/ioctl.h>
+#include <sys/memrange.h>
+#include <sys/mman.h>
+#include <sys/pciio.h>
+
+#include <dev/pci/pcireg.h>
+#include <dev/pci/pcidevs.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "pciaccess.h"
+#include "pciaccess_private.h"
+
+static int pcifd;
+static int aperturefd = -1;
+
+static int
+pci_read(int bus, int dev, int func, uint32_t reg, uint32_t *val)
+{
+	struct pci_io io;
+	int err;
+
+	bzero(&io, sizeof(io));
+	io.pi_sel.pc_bus = bus;
+	io.pi_sel.pc_dev = dev;
+	io.pi_sel.pc_func = func;
+	io.pi_reg = reg;
+	io.pi_width = 4;
+
+	err = ioctl(pcifd, PCIOCREAD, &io);
+	if (err)
+		return (err);
+
+	*val = io.pi_data;
+
+	return (0);
+}
+
+static int
+pci_write(int bus, int dev, int func, uint32_t reg, uint32_t val)
+{
+	struct pci_io io;
+
+	bzero(&io, sizeof(io));
+	io.pi_sel.pc_bus = bus;
+	io.pi_sel.pc_dev = dev;
+	io.pi_sel.pc_func = func;
+	io.pi_reg = reg;
+	io.pi_width = 4;
+	io.pi_data = val;
+
+	return ioctl(pcifd, PCIOCWRITE, &io);
+}
+
+static int
+pci_nfuncs(int bus, int dev)
+{
+	uint32_t hdr;
+
+	if (pci_read(bus, dev, 0, PCI_BHLC_REG, &hdr) != 0)
+		return -1;
+
+	return (PCI_HDRTYPE_MULTIFN(hdr) ? 8 : 1);
+}
+
+static int
+pci_device_openbsd_map_range(struct pci_device *dev,
+    struct pci_device_mapping *map)
+{
+	struct mem_range_desc mr;
+	struct mem_range_op mo;
+	int prot = PROT_READ;
+
+	if (map->flags & PCI_DEV_MAP_FLAG_WRITABLE)
+		prot |= PROT_WRITE;
+
+	map->memory = mmap(NULL, map->size, prot, MAP_SHARED, aperturefd,
+	    map->base);
+	if (map->memory == MAP_FAILED)
+		return  errno;
+
+	/* No need to set an MTRR if it's the default mode. */
+	if ((map->flags & PCI_DEV_MAP_FLAG_CACHABLE) ||
+	    (map->flags & PCI_DEV_MAP_FLAG_WRITE_COMBINE)) {
+		mr.mr_base = map->base;
+		mr.mr_len = map->size;
+		mr.mr_flags = 0;
+		if (map->flags & PCI_DEV_MAP_FLAG_CACHABLE)
+			mr.mr_flags |= MDF_WRITEBACK;
+		if (map->flags & PCI_DEV_MAP_FLAG_WRITE_COMBINE)
+			mr.mr_flags |= MDF_WRITECOMBINE;
+		strlcpy(mr.mr_owner, "pciaccess", sizeof(mr.mr_owner));
+
+		mo.mo_desc = &mr;
+		mo.mo_arg[0] = MEMRANGE_SET_UPDATE;
+
+		if (ioctl(aperturefd, MEMRANGE_SET, &mo))
+			return errno;
+	}
+
+	return 0;
+}
+
+static int
+pci_device_openbsd_unmap_range(struct pci_device *dev,
+    struct pci_device_mapping *map)
+{
+	struct mem_range_desc mr;
+	struct mem_range_op mo;
+
+	if ((map->flags & PCI_DEV_MAP_FLAG_CACHABLE) ||
+	    (map->flags & PCI_DEV_MAP_FLAG_WRITE_COMBINE)) {
+		mr.mr_base = map->base;
+		mr.mr_len = map->size;
+		mr.mr_flags = MDF_UNCACHEABLE;
+		strlcpy(mr.mr_owner, "pciaccess", sizeof(mr.mr_owner));
+
+		mo.mo_desc = &mr;
+		mo.mo_arg[0] = MEMRANGE_SET_REMOVE;
+
+		(void)ioctl(aperturefd, MEMRANGE_SET, &mo);
+	}
+
+	return pci_device_generic_unmap_range(dev, map);
+}
+
+static int
+pci_device_openbsd_read(struct pci_device *dev, void *data,
+    pciaddr_t offset, pciaddr_t size, pciaddr_t *bytes_read)
+{
+	struct pci_io io;
+
+	io.pi_sel.pc_bus = dev->bus;
+	io.pi_sel.pc_dev = dev->dev;
+	io.pi_sel.pc_func = dev->func;
+
+	*bytes_read = 0;
+	while (size > 0) {
+		int toread = MIN(size, 4 - (offset & 0x3));
+
+		io.pi_reg = (offset & ~0x3);
+		io.pi_width = 4;
+
+		if (ioctl(pcifd, PCIOCREAD, &io) == -1)
+			return errno;
+
+		io.pi_data = htole32(io.pi_data);
+		io.pi_data >>= ((offset & 0x3) * 8);
+
+		memcpy(data, &io.pi_data, toread);
+
+		offset += toread;
+		data = (char *)data + toread;
+		size -= toread;
+		*bytes_read += toread;
+	}
+
+	return 0;
+}
+
+static int
+pci_device_openbsd_write(struct pci_device *dev, const void *data,
+    pciaddr_t offset, pciaddr_t size, pciaddr_t *bytes_written)
+{
+	struct pci_io io;
+
+	if ((offset % 4) == 0 || (size % 4) == 0)
+		return EINVAL;
+
+	io.pi_sel.pc_bus = dev->bus;
+	io.pi_sel.pc_dev = dev->dev;
+	io.pi_sel.pc_func = dev->func;
+
+	*bytes_written = 0;
+	while (size > 0) {
+		io.pi_reg = offset;
+		io.pi_width = 4;
+		memcpy(&io.pi_data, data, 4);
+
+		if (ioctl(pcifd, PCIOCWRITE, &io) == -1) 
+			return errno;
+
+		offset += 4;
+		data = (char *)data + 4;
+		size -= 4;
+		*bytes_written += 4;
+	}
+
+	return 0;
+}
+
+static void
+pci_system_openbsd_destroy(void)
+{
+	close(aperturefd);
+	close(pcifd);
+	free(pci_sys);
+	pci_sys = NULL;
+}
+
+static int
+pci_device_openbsd_probe(struct pci_device *device)
+{
+	struct pci_device_private *priv = (struct pci_device_private *)device;
+	struct pci_mem_region *region;
+	uint64_t reg64, size64;
+	uint32_t bar, reg, size;
+	int bus, dev, func, err;
+
+	bus = device->bus;
+	dev = device->dev;
+	func = device->func;
+
+	err = pci_read(bus, dev, func, PCI_BHLC_REG, &reg);
+	if (err)
+		return err;
+
+	priv->header_type = PCI_HDRTYPE_TYPE(reg);
+	if (priv->header_type != 0)
+		return 0;
+
+	region = device->regions;
+	for (bar = PCI_MAPREG_START; bar < PCI_MAPREG_END;
+	     bar += sizeof(uint32_t), region++) {
+		err = pci_read(bus, dev, func, bar, &reg);
+		if (err)
+			return err;
+
+		/* Probe the size of the region. */
+		err = pci_write(bus, dev, func, bar, ~0);
+		if (err)
+			return err;
+		pci_read(bus, dev, func, bar, &size);
+		pci_write(bus, dev, func, bar, reg);
+
+		if (PCI_MAPREG_TYPE(reg) == PCI_MAPREG_TYPE_IO) {
+			region->is_IO = 1;
+			region->base_addr = PCI_MAPREG_IO_ADDR(reg);
+			region->size = PCI_MAPREG_IO_SIZE(size);
+		} else {
+			if (PCI_MAPREG_MEM_PREFETCHABLE(reg))
+				region->is_prefetchable = 1;
+			switch(PCI_MAPREG_MEM_TYPE(reg)) {
+			case PCI_MAPREG_MEM_TYPE_32BIT:
+			case PCI_MAPREG_MEM_TYPE_32BIT_1M:
+				region->base_addr = PCI_MAPREG_MEM_ADDR(reg);
+				region->size = PCI_MAPREG_MEM_SIZE(size);
+				break;
+			case PCI_MAPREG_MEM_TYPE_64BIT:
+				region->is_64 = 1;
+
+				reg64 = reg;
+				size64 = size;
+
+				bar += sizeof(uint32_t);
+
+				err = pci_read(bus, dev, func, bar, &reg);
+				if (err)
+					return err;
+				reg64 |= (uint64_t)reg << 32;
+
+				err = pci_write(bus, dev, func, bar, ~0);
+				if (err)
+					return err;
+				pci_read(bus, dev, func, bar, &size);
+				pci_write(bus, dev, func, bar, reg64 >> 32);
+				size64 |= (uint64_t)size << 32;
+
+				region->base_addr = PCI_MAPREG_MEM64_ADDR(reg64);
+				region->size = PCI_MAPREG_MEM64_SIZE(size64);
+				region++;
+				break;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static const struct pci_system_methods openbsd_pci_methods = {
+	pci_system_openbsd_destroy,
+	NULL,
+	NULL,
+	pci_device_openbsd_probe,
+	pci_device_openbsd_map_range,
+	pci_device_openbsd_unmap_range,
+	pci_device_openbsd_read,
+	pci_device_openbsd_write,
+	pci_fill_capabilities_generic
+};
+
+int
+pci_system_openbsd_create(void)
+{
+	struct pci_device_private *device;
+	int bus, dev, func, ndevs, nfuncs;
+	uint32_t reg;
+
+	pcifd = open("/dev/pci", O_RDWR);
+	if (pcifd == -1)
+		return ENXIO;
+
+	pci_sys = calloc(1, sizeof(struct pci_system));
+	if (pci_sys == NULL) {
+		close(aperturefd);
+		close(pcifd);
+		return ENOMEM;
+	}
+
+	pci_sys->methods = &openbsd_pci_methods;
+
+	ndevs = 0;
+	for (bus = 0; bus < 256; bus++) {
+		for (dev = 0; dev < 32; dev++) {
+			nfuncs = pci_nfuncs(bus, dev);
+			for (func = 0; func < nfuncs; func++) {
+				if (pci_read(bus, dev, func, PCI_ID_REG,
+				    &reg) != 0)
+					continue;
+				if (PCI_VENDOR(reg) == PCI_VENDOR_INVALID ||
+				    PCI_VENDOR(reg) == 0)
+					continue;
+
+				ndevs++;
+			}
+		}
+	}
+
+	pci_sys->num_devices = ndevs;
+	pci_sys->devices = calloc(ndevs, sizeof(struct pci_device_private));
+	if (pci_sys->devices == NULL) {
+		free(pci_sys);
+		close(pcifd);
+		return ENOMEM;
+	}
+
+	device = pci_sys->devices;
+	for (bus = 0; bus < 256; bus++) {
+		for (dev = 0; dev < 32; dev++) {
+			nfuncs = pci_nfuncs(bus, dev);
+			for (func = 0; func < nfuncs; func++) {
+				if (pci_read(bus, dev, func, PCI_ID_REG,
+				    &reg) != 0)
+					continue;
+				if (PCI_VENDOR(reg) == PCI_VENDOR_INVALID ||
+				    PCI_VENDOR(reg) == 0)
+					continue;
+
+				device->base.domain = 0;
+				device->base.bus = bus;
+				device->base.dev = dev;
+				device->base.func = func;
+				device->base.vendor_id = PCI_VENDOR(reg);
+				device->base.device_id = PCI_PRODUCT(reg);
+
+				if (pci_read(bus, dev, func, PCI_CLASS_REG,
+				    &reg) != 0)
+					continue;
+
+				device->base.device_class =
+				    PCI_INTERFACE(reg) | PCI_CLASS(reg) << 16 |
+				    PCI_SUBCLASS(reg) << 8;
+				device->base.revision = PCI_REVISION(reg);
+
+				if (pci_read(bus, dev, func, PCI_SUBVEND_0,
+				    &reg) != 0)
+					continue;
+
+				device->base.subvendor_id = PCI_VENDOR(reg);
+				device->base.subdevice_id = PCI_PRODUCT(reg);
+
+				device++;
+			}
+		}
+	}
+
+	return 0;
+}
+
+void
+pci_system_openbsd_init_dev_mem(int fd)
+{
+	aperturefd = fd;
+}
diff --git a/src/pciaccess_private.h b/src/pciaccess_private.h
index c8a483e..94b12bd 100644
--- a/src/pciaccess_private.h
+++ b/src/pciaccess_private.h
@@ -135,3 +135,5 @@ extern struct pci_system * pci_sys;
 
 extern int pci_system_linux_sysfs_create( void );
 extern int pci_system_freebsd_create( void );
+extern int pci_system_openbsd_create( void );
+extern void pci_system_openbsd_init_dev_mem( int );