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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH V8 3/8] Introduce HostPCIDevice to access a pci device on the host.
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
Makefile.target | 3 +
hw/host-pci-device.c | 278 ++++++++++++++++++++++++++++++++++++++++++++++++++
hw/host-pci-device.h | 75 ++++++++++++++
3 files changed, 356 insertions(+), 0 deletions(-)
create mode 100644 hw/host-pci-device.c
create mode 100644 hw/host-pci-device.h
diff --git a/Makefile.target b/Makefile.target
index 68a5641..646ea00 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -223,6 +223,9 @@ obj-$(CONFIG_NO_XEN) += xen-stub.o
obj-i386-$(CONFIG_XEN) += xen_platform.o
+# Xen PCI Passthrough
+obj-i386-$(CONFIG_XEN_PCI_PASSTHROUGH) += host-pci-device.o
+
# Inter-VM PCI shared memory
CONFIG_IVSHMEM =
ifeq ($(CONFIG_KVM), y)
diff --git a/hw/host-pci-device.c b/hw/host-pci-device.c
new file mode 100644
index 0000000..3dacb30
--- /dev/null
+++ b/hw/host-pci-device.c
@@ -0,0 +1,278 @@
+/*
+ * 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 "host-pci-device.h"
+
+#define PCI_MAX_EXT_CAP \
+ ((PCIE_CONFIG_SPACE_SIZE - PCI_CONFIG_SPACE_SIZE) / (PCI_CAP_SIZEOF + 4))
+
+enum error_code {
+ ERROR_SYNTAX = 1,
+};
+
+static int path_to(const HostPCIDevice *d,
+ const char *name, char *buf, ssize_t size)
+{
+ return snprintf(buf, size, "/sys/bus/pci/devices/%04x:%02x:%02x.%x/%s",
+ d->domain, d->bus, d->dev, d->func, name);
+}
+
+static int get_resource(HostPCIDevice *d)
+{
+ int i, rc = 0;
+ FILE *f;
+ char path[PATH_MAX];
+ unsigned long long start, end, flags, size;
+
+ path_to(d, "resource", path, sizeof (path));
+ f = fopen(path, "r");
+ if (!f) {
+ fprintf(stderr, "Error: Can't open %s: %s\n", path, strerror(errno));
+ return -errno;
+ }
+
+ for (i = 0; i < PCI_NUM_REGIONS; i++) {
+ if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
+ fprintf(stderr, "Error: Syntax error in %s\n", path);
+ rc = ERROR_SYNTAX;
+ break;
+ }
+ 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;
+ }
+ }
+
+ fclose(f);
+ return rc;
+}
+
+static int get_hex_value(HostPCIDevice *d, const char *name,
+ unsigned long *pvalue)
+{
+ char path[PATH_MAX];
+ FILE *f;
+ unsigned long value;
+
+ path_to(d, name, path, sizeof (path));
+ f = fopen(path, "r");
+ if (!f) {
+ fprintf(stderr, "Error: Can't open %s: %s\n", path, strerror(errno));
+ return -errno;
+ }
+ if (fscanf(f, "%lx\n", &value) != 1) {
+ fprintf(stderr, "Error: Syntax error in %s\n", path);
+ fclose(f);
+ return ERROR_SYNTAX;
+ }
+ fclose(f);
+ *pvalue = value;
+ return 0;
+}
+
+static bool pci_dev_is_virtfn(HostPCIDevice *d)
+{
+ char path[PATH_MAX];
+ struct stat buf;
+
+ path_to(d, "physfn", path, sizeof (path));
+ return !stat(path, &buf);
+}
+
+static int host_pci_config_fd(HostPCIDevice *d)
+{
+ char path[PATH_MAX];
+
+ if (d->config_fd < 0) {
+ path_to(d, "config", path, sizeof (path));
+ d->config_fd = open(path, O_RDWR);
+ if (d->config_fd < 0) {
+ fprintf(stderr, "HostPCIDevice: Can not open '%s': %s\n",
+ path, strerror(errno));
+ }
+ }
+ return d->config_fd;
+}
+static int host_pci_config_read(HostPCIDevice *d, int pos, void *buf, int len)
+{
+ int fd = host_pci_config_fd(d);
+ int res = 0;
+
+again:
+ res = pread(fd, buf, len, pos);
+ if (res != len) {
+ if (res < 0 && (errno == EINTR || errno == EAGAIN)) {
+ goto again;
+ }
+ fprintf(stderr, "%s: read failed: %s (fd: %i)\n",
+ __func__, strerror(errno), fd);
+ return -errno;
+ }
+ return 0;
+}
+static int host_pci_config_write(HostPCIDevice *d,
+ int pos, const void *buf, int len)
+{
+ int fd = host_pci_config_fd(d);
+ int res = 0;
+
+again:
+ res = pwrite(fd, buf, len, pos);
+ if (res != len) {
+ if (res < 0 && (errno == EINTR || errno == EAGAIN)) {
+ goto again;
+ }
+ fprintf(stderr, "%s: write failed: %s\n",
+ __func__, strerror(errno));
+ return -errno;
+ }
+ return 0;
+}
+
+int host_pci_get_byte(HostPCIDevice *d, int pos, uint8_t *p)
+{
+ uint8_t buf;
+ int rc = host_pci_config_read(d, pos, &buf, 1);
+ if (rc == 0) {
+ *p = buf;
+ }
+ return rc;
+}
+int host_pci_get_word(HostPCIDevice *d, int pos, uint16_t *p)
+{
+ uint16_t buf;
+ int rc = host_pci_config_read(d, pos, &buf, 2);
+ if (rc == 0) {
+ *p = le16_to_cpu(buf);
+ }
+ return rc;
+}
+int host_pci_get_long(HostPCIDevice *d, int pos, uint32_t *p)
+{
+ uint32_t buf;
+ int rc = host_pci_config_read(d, pos, &buf, 4);
+ if (rc == 0) {
+ *p = le32_to_cpu(buf);
+ }
+ return rc;
+}
+int host_pci_get_block(HostPCIDevice *d, int pos, uint8_t *buf, int len)
+{
+ return host_pci_config_read(d, pos, buf, len);
+}
+
+int host_pci_set_byte(HostPCIDevice *d, int pos, uint8_t data)
+{
+ return host_pci_config_write(d, pos, &data, 1);
+}
+int host_pci_set_word(HostPCIDevice *d, int pos, uint16_t data)
+{
+ data = cpu_to_le16(data);
+ return host_pci_config_write(d, pos, &data, 2);
+}
+int host_pci_set_long(HostPCIDevice *d, int pos, uint32_t data)
+{
+ data = cpu_to_le32(data);
+ return host_pci_config_write(d, pos, &data, 4);
+}
+int host_pci_set_block(HostPCIDevice *d, int pos, uint8_t *buf, int len)
+{
+ return host_pci_config_write(d, pos, buf, len);
+}
+
+uint32_t host_pci_find_ext_cap_offset(HostPCIDevice *d, uint32_t cap)
+{
+ uint32_t header = 0;
+ int max_cap = PCI_MAX_EXT_CAP;
+ int pos = PCI_CONFIG_SPACE_SIZE;
+
+ do {
+ if (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;
+}
+
+HostPCIDevice *host_pci_device_get(uint8_t bus, uint8_t dev, uint8_t func)
+{
+ HostPCIDevice *d = NULL;
+ unsigned long v = 0;
+
+ d = g_new0(HostPCIDevice, 1);
+
+ d->config_fd = -1;
+ d->domain = 0;
+ d->bus = bus;
+ d->dev = dev;
+ d->func = func;
+
+ if (host_pci_config_fd(d) == -1) {
+ goto error;
+ }
+ if (get_resource(d) != 0) {
+ goto error;
+ }
+
+ if (get_hex_value(d, "vendor", &v)) {
+ goto error;
+ }
+ d->vendor_id = v;
+ if (get_hex_value(d, "device", &v)) {
+ goto error;
+ }
+ d->device_id = v;
+ d->is_virtfn = pci_dev_is_virtfn(d);
+
+ return d;
+error:
+ if (d->config_fd >= 0) {
+ close(d->config_fd);
+ }
+ g_free(d);
+ return NULL;
+}
+
+void host_pci_device_put(HostPCIDevice *d)
+{
+ if (d->config_fd >= 0) {
+ close(d->config_fd);
+ }
+ g_free(d);
+}
diff --git a/hw/host-pci-device.h b/hw/host-pci-device.h
new file mode 100644
index 0000000..c8880eb
--- /dev/null
+++ b/hw/host-pci-device.h
@@ -0,0 +1,75 @@
+#ifndef HW_HOST_PCI_DEVICE
+# define HW_HOST_PCI_DEVICE
+
+#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 HostPCIIORegion {
+ unsigned long flags;
+ pcibus_t base_addr;
+ pcibus_t size;
+} HostPCIIORegion;
+
+typedef struct HostPCIDevice {
+ uint16_t domain;
+ uint8_t bus;
+ uint8_t dev;
+ uint8_t func;
+
+ uint16_t vendor_id;
+ uint16_t device_id;
+
+ HostPCIIORegion io_regions[PCI_NUM_REGIONS - 1];
+ HostPCIIORegion rom;
+
+ bool is_virtfn;
+
+ int config_fd;
+} HostPCIDevice;
+
+HostPCIDevice *host_pci_device_get(uint8_t bus, uint8_t dev, uint8_t func);
+void host_pci_device_put(HostPCIDevice *pci_dev);
+
+int host_pci_get_byte(HostPCIDevice *d, int pos, uint8_t *p);
+int host_pci_get_word(HostPCIDevice *d, int pos, uint16_t *p);
+int host_pci_get_long(HostPCIDevice *d, int pos, uint32_t *p);
+int host_pci_get_block(HostPCIDevice *d, int pos, uint8_t *buf, int len);
+int host_pci_set_byte(HostPCIDevice *d, int pos, uint8_t data);
+int host_pci_set_word(HostPCIDevice *d, int pos, uint16_t data);
+int host_pci_set_long(HostPCIDevice *d, int pos, uint32_t data);
+int host_pci_set_block(HostPCIDevice *d, int pos, uint8_t *buf, int len);
+
+uint32_t host_pci_find_ext_cap_offset(HostPCIDevice *s, uint32_t cap);
+
+#endif /* !HW_HOST_PCI_DEVICE */
--
Anthony PERARD
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