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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH V10 3/8] Introduce XenHostPCIDevice to access a pci device on the host.
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
Makefile.target | 3 +
hw/xen-host-pci-device.c | 354 ++++++++++++++++++++++++++++++++++++++++++++++
hw/xen-host-pci-device.h | 78 ++++++++++
3 files changed, 435 insertions(+), 0 deletions(-)
create mode 100644 hw/xen-host-pci-device.c
create mode 100644 hw/xen-host-pci-device.h
diff --git a/Makefile.target b/Makefile.target
index 44b2e83..70386a7 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -235,6 +235,9 @@ obj-$(CONFIG_NO_XEN) += xen-stub.o
obj-i386-$(CONFIG_XEN) += xen_platform.o
+# Xen PCI Passthrough
+obj-i386-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
+
# Inter-VM PCI shared memory
CONFIG_IVSHMEM =
ifeq ($(CONFIG_KVM), y)
diff --git a/hw/xen-host-pci-device.c b/hw/xen-host-pci-device.c
new file mode 100644
index 0000000..a1932d9
--- /dev/null
+++ b/hw/xen-host-pci-device.c
@@ -0,0 +1,354 @@
+/*
+ * Copyright (C) 2011 Citrix Ltd.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu-common.h"
+#include "xen-host-pci-device.h"
+
+#define XEN_HOST_PCI_MAX_EXT_CAP \
+ ((PCIE_CONFIG_SPACE_SIZE - PCI_CONFIG_SPACE_SIZE) / (PCI_CAP_SIZEOF + 4))
+
+#ifdef XEN_HOST_PCI_DEVICE_DEBUG
+# define XEN_HOST_PCI_LOG(f, a...) fprintf(stderr, "%s: " f, __func__, ##a)
+#else
+# define XEN_HOST_PCI_LOG(f, a...) (void)0
+#endif
+
+static int xen_host_pci_sysfs_path(const XenHostPCIDevice *d,
+ const char *name, char *buf, ssize_t size)
+{
+ int rc;
+
+ rc = snprintf(buf, size, "/sys/bus/pci/devices/%04x:%02x:%02x.%x/%s",
+ d->domain, d->bus, d->dev, d->func, name);
+
+ if (rc >= size || rc < 0) {
+ /* The ouput is truncated or an other error is encountered */
+ return -1;
+ }
+ return 0;
+}
+
+static int xen_host_pci_get_resource(XenHostPCIDevice *d)
+{
+ int i, rc, fd;
+ char path[PATH_MAX];
+ char buf[512];
+ unsigned long long start, end, flags, size;
+ char *endptr, *s;
+
+ if (xen_host_pci_sysfs_path(d, "resource", path, sizeof (path))) {
+ return -1;
+ }
+ fd = open(path, O_RDONLY);
+ if (fd == -1) {
+ XEN_HOST_PCI_LOG("Error: Can't open %s: %s\n", path, strerror(errno));
+ return -errno;
+ }
+
+ do {
+ rc = read(fd, &buf, sizeof (buf));
+ if (rc < 0 && errno != EINTR) {
+ rc = -errno;
+ goto out;
+ }
+ } while (rc < 0);
+ buf[rc] = 0;
+ rc = 0;
+
+ s = buf;
+ for (i = 0; i < PCI_NUM_REGIONS; i++) {
+ start = strtoll(s, &endptr, 16);
+ if (*endptr != ' ' || s == endptr) {
+ break;
+ }
+ s = endptr + 1;
+ end = strtoll(s, &endptr, 16);
+ if (*endptr != ' ' || s == endptr) {
+ break;
+ }
+ s = endptr + 1;
+ flags = strtoll(s, &endptr, 16);
+ if (*endptr != '\n' || s == endptr) {
+ break;
+ }
+ s = endptr + 1;
+
+ if (start) {
+ size = end - start + 1;
+ } else {
+ size = 0;
+ }
+
+ if (i < PCI_ROM_SLOT) {
+ d->io_regions[i].base_addr = start;
+ d->io_regions[i].size = size;
+ d->io_regions[i].flags = flags;
+ } else {
+ d->rom.base_addr = start;
+ d->rom.size = size;
+ d->rom.flags = flags;
+ }
+ }
+ if (i != PCI_NUM_REGIONS) {
+ rc = -1;
+ }
+
+out:
+ close(fd);
+ return rc;
+}
+
+static int xen_host_pci_get_value(XenHostPCIDevice *d, const char *name,
+ unsigned int *pvalue, int base)
+{
+ char path[PATH_MAX];
+ char buf[42];
+ int fd, rc;
+ unsigned long value;
+ char *endptr;
+
+ if (xen_host_pci_sysfs_path(d, name, path, sizeof (path))) {
+ return -1;
+ }
+ fd = open(path, O_RDONLY);
+ if (fd == -1) {
+ XEN_HOST_PCI_LOG("Error: Can't open %s: %s\n", path, strerror(errno));
+ return -errno;
+ }
+ do {
+ rc = read(fd, &buf, sizeof (buf) - 1);
+ if (rc < 0 && errno != EINTR) {
+ rc = -errno;
+ goto out;
+ }
+ } while (rc < 0);
+ buf[rc] = 0;
+ value = strtol(buf, &endptr, base);
+ if (endptr == buf || *endptr != '\n') {
+ rc = -1;
+ } else if ((value == LONG_MIN || value == LONG_MAX) && errno == ERANGE) {
+ rc = -errno;
+ } else {
+ rc = 0;
+ *pvalue = value;
+ }
+out:
+ close(fd);
+ return rc;
+}
+
+static inline int xen_host_pci_get_hex_value(XenHostPCIDevice *d,
+ const char *name,
+ unsigned int *pvalue)
+{
+ return xen_host_pci_get_value(d, name, pvalue, 16);
+}
+
+static inline int xen_host_pci_get_dec_value(XenHostPCIDevice *d,
+ const char *name,
+ unsigned int *pvalue)
+{
+ return xen_host_pci_get_value(d, name, pvalue, 10);
+}
+
+static bool xen_host_pci_dev_is_virtfn(XenHostPCIDevice *d)
+{
+ char path[PATH_MAX];
+ struct stat buf;
+
+ if (xen_host_pci_sysfs_path(d, "physfn", path, sizeof (path))) {
+ return false;
+ }
+ return !stat(path, &buf);
+}
+
+static int xen_host_pci_config_open(XenHostPCIDevice *d)
+{
+ char path[PATH_MAX];
+
+ if (xen_host_pci_sysfs_path(d, "config", path, sizeof (path))) {
+ return -1;
+ }
+ d->config_fd = open(path, O_RDWR);
+ if (d->config_fd < 0) {
+ return -errno;
+ }
+ return 0;
+}
+
+static int xen_host_pci_config_read(XenHostPCIDevice *d,
+ int pos, void *buf, int len)
+{
+ int rc;
+
+ do {
+ rc = pread(d->config_fd, buf, len, pos);
+ } while (rc < 0 && (errno == EINTR || errno == EAGAIN));
+ if (rc != len) {
+ return -errno;
+ }
+ return 0;
+}
+
+static int xen_host_pci_config_write(XenHostPCIDevice *d,
+ int pos, const void *buf, int len)
+{
+ int rc;
+
+ do {
+ rc = pwrite(d->config_fd, buf, len, pos);
+ } while (rc < 0 && (errno == EINTR || errno == EAGAIN));
+ if (rc != len) {
+ return -errno;
+ }
+ return 0;
+}
+
+int xen_host_pci_get_byte(XenHostPCIDevice *d, int pos, uint8_t *p)
+{
+ uint8_t buf;
+ int rc = xen_host_pci_config_read(d, pos, &buf, 1);
+ if (!rc) {
+ *p = buf;
+ }
+ return rc;
+}
+
+int xen_host_pci_get_word(XenHostPCIDevice *d, int pos, uint16_t *p)
+{
+ uint16_t buf;
+ int rc = xen_host_pci_config_read(d, pos, &buf, 2);
+ if (!rc) {
+ *p = le16_to_cpu(buf);
+ }
+ return rc;
+}
+
+int xen_host_pci_get_long(XenHostPCIDevice *d, int pos, uint32_t *p)
+{
+ uint32_t buf;
+ int rc = xen_host_pci_config_read(d, pos, &buf, 4);
+ if (!rc) {
+ *p = le32_to_cpu(buf);
+ }
+ return rc;
+}
+
+int xen_host_pci_get_block(XenHostPCIDevice *d, int pos, uint8_t *buf, int len)
+{
+ return xen_host_pci_config_read(d, pos, buf, len);
+}
+
+int xen_host_pci_set_byte(XenHostPCIDevice *d, int pos, uint8_t data)
+{
+ return xen_host_pci_config_write(d, pos, &data, 1);
+}
+
+int xen_host_pci_set_word(XenHostPCIDevice *d, int pos, uint16_t data)
+{
+ data = cpu_to_le16(data);
+ return xen_host_pci_config_write(d, pos, &data, 2);
+}
+
+int xen_host_pci_set_long(XenHostPCIDevice *d, int pos, uint32_t data)
+{
+ data = cpu_to_le32(data);
+ return xen_host_pci_config_write(d, pos, &data, 4);
+}
+
+int xen_host_pci_set_block(XenHostPCIDevice *d, int pos, uint8_t *buf, int len)
+{
+ return xen_host_pci_config_write(d, pos, buf, len);
+}
+
+int xen_host_pci_find_ext_cap_offset(XenHostPCIDevice *d, uint32_t cap)
+{
+ uint32_t header = 0;
+ int max_cap = XEN_HOST_PCI_MAX_EXT_CAP;
+ int pos = PCI_CONFIG_SPACE_SIZE;
+
+ do {
+ if (xen_host_pci_get_long(d, pos, &header)) {
+ break;
+ }
+ /*
+ * If we have no capabilities, this is indicated by cap ID,
+ * cap version and next pointer all being 0.
+ */
+ if (header == 0) {
+ break;
+ }
+
+ if (PCI_EXT_CAP_ID(header) == cap) {
+ return pos;
+ }
+
+ pos = PCI_EXT_CAP_NEXT(header);
+ if (pos < PCI_CONFIG_SPACE_SIZE) {
+ break;
+ }
+
+ max_cap--;
+ } while (max_cap > 0);
+
+ return 0;
+}
+
+int xen_host_pci_device_get(XenHostPCIDevice *d, uint16_t domain,
+ uint8_t bus, uint8_t dev, uint8_t func)
+{
+ unsigned int v;
+ int rc = 0;
+
+ d->config_fd = -1;
+ d->domain = domain;
+ d->bus = bus;
+ d->dev = dev;
+ d->func = func;
+
+ rc = xen_host_pci_config_open(d);
+ if (rc) {
+ goto error;
+ }
+ rc = xen_host_pci_get_resource(d);
+ if (rc) {
+ goto error;
+ }
+ rc = xen_host_pci_get_hex_value(d, "vendor", &v);
+ if (rc) {
+ goto error;
+ }
+ d->vendor_id = v;
+ rc = xen_host_pci_get_hex_value(d, "device", &v);
+ if (rc) {
+ goto error;
+ }
+ d->device_id = v;
+ rc = xen_host_pci_get_dec_value(d, "irq", &v);
+ if (rc) {
+ goto error;
+ }
+ d->irq = v;
+ d->is_virtfn = xen_host_pci_dev_is_virtfn(d);
+
+ return 0;
+error:
+ if (d->config_fd >= 0) {
+ close(d->config_fd);
+ d->config_fd = -1;
+ }
+ return rc;
+}
+
+void xen_host_pci_device_put(XenHostPCIDevice *d)
+{
+ if (d->config_fd >= 0) {
+ close(d->config_fd);
+ d->config_fd = -1;
+ }
+}
diff --git a/hw/xen-host-pci-device.h b/hw/xen-host-pci-device.h
new file mode 100644
index 0000000..c5b183b
--- /dev/null
+++ b/hw/xen-host-pci-device.h
@@ -0,0 +1,78 @@
+#ifndef XEN_HOST_PCI_DEVICE_H
+#define XEN_HOST_PCI_DEVICE_H
+
+#include "pci.h"
+
+/*
+ * from linux/ioport.h
+ * IO resources have these defined flags.
+ */
+#define IORESOURCE_BITS 0x000000ff /* Bus-specific bits */
+
+#define IORESOURCE_TYPE_BITS 0x00000f00 /* Resource type */
+#define IORESOURCE_IO 0x00000100
+#define IORESOURCE_MEM 0x00000200
+#define IORESOURCE_IRQ 0x00000400
+#define IORESOURCE_DMA 0x00000800
+
+#define IORESOURCE_PREFETCH 0x00001000 /* No side effects */
+#define IORESOURCE_READONLY 0x00002000
+#define IORESOURCE_CACHEABLE 0x00004000
+#define IORESOURCE_RANGELENGTH 0x00008000
+#define IORESOURCE_SHADOWABLE 0x00010000
+
+#define IORESOURCE_SIZEALIGN 0x00020000 /* size indicates alignment */
+#define IORESOURCE_STARTALIGN 0x00040000 /* start field is alignment */
+
+#define IORESOURCE_MEM_64 0x00100000
+
+/* Userland may not map this resource */
+#define IORESOURCE_EXCLUSIVE 0x08000000
+#define IORESOURCE_DISABLED 0x10000000
+#define IORESOURCE_UNSET 0x20000000
+#define IORESOURCE_AUTO 0x40000000
+/* Driver has marked this resource busy */
+#define IORESOURCE_BUSY 0x80000000
+
+typedef struct XenHostPCIIORegion {
+ unsigned long flags;
+ pcibus_t base_addr;
+ pcibus_t size;
+} XenHostPCIIORegion;
+
+typedef struct XenHostPCIDevice {
+ uint16_t domain;
+ uint8_t bus;
+ uint8_t dev;
+ uint8_t func;
+
+ uint16_t vendor_id;
+ uint16_t device_id;
+ int irq;
+
+ XenHostPCIIORegion io_regions[PCI_NUM_REGIONS - 1];
+ XenHostPCIIORegion rom;
+
+ bool is_virtfn;
+
+ int config_fd;
+} XenHostPCIDevice;
+
+int xen_host_pci_device_get(XenHostPCIDevice *d, uint16_t domain,
+ uint8_t bus, uint8_t dev, uint8_t func);
+void xen_host_pci_device_put(XenHostPCIDevice *pci_dev);
+
+int xen_host_pci_get_byte(XenHostPCIDevice *d, int pos, uint8_t *p);
+int xen_host_pci_get_word(XenHostPCIDevice *d, int pos, uint16_t *p);
+int xen_host_pci_get_long(XenHostPCIDevice *d, int pos, uint32_t *p);
+int xen_host_pci_get_block(XenHostPCIDevice *d, int pos, uint8_t *buf,
+ int len);
+int xen_host_pci_set_byte(XenHostPCIDevice *d, int pos, uint8_t data);
+int xen_host_pci_set_word(XenHostPCIDevice *d, int pos, uint16_t data);
+int xen_host_pci_set_long(XenHostPCIDevice *d, int pos, uint32_t data);
+int xen_host_pci_set_block(XenHostPCIDevice *d, int pos, uint8_t *buf,
+ int len);
+
+int xen_host_pci_find_ext_cap_offset(XenHostPCIDevice *s, uint32_t cap);
+
+#endif /* !XEN_HOST_PCI_DEVICE_H_ */
--
Anthony PERARD
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