From 2060db832a9b77345e6beb9a4dd5b18e8f9427cf Mon Sep 17 00:00:00 2001 From: Damjan Marion Date: Sun, 4 Mar 2018 17:37:15 +0100 Subject: vlib: map pci region by using vfio FD when vfio is used Change-Id: Ib94e9e9e9fcdad9cdb0e3402b3de7d78bd644abe Signed-off-by: Damjan Marion --- src/vlib/linux/pci.c | 124 ++++++++++++++++++++++++++++++++++----------------- 1 file changed, 83 insertions(+), 41 deletions(-) (limited to 'src/vlib/linux/pci.c') diff --git a/src/vlib/linux/pci.c b/src/vlib/linux/pci.c index e67e651d9a8..e127cf46a97 100644 --- a/src/vlib/linux/pci.c +++ b/src/vlib/linux/pci.c @@ -61,11 +61,27 @@ static char *sysfs_mod_vfio_noiommu = typedef struct { + int fd; + void *addr; + size_t size; +} linux_pci_region_t; + + +typedef enum +{ + LINUX_PCI_DEVICE_TYPE_UNKNOWN, + LINUX_PCI_DEVICE_TYPE_UIO, + LINUX_PCI_DEVICE_TYPE_VFIO, +} linux_pci_device_type_t; + +typedef struct +{ + linux_pci_device_type_t type; vlib_pci_dev_handle_t handle; vlib_pci_addr_t addr; /* Resource file descriptors. */ - int *resource_fds; + linux_pci_region_t *regions; /* File descriptor for config space read/write. */ int config_fd; @@ -596,6 +612,7 @@ add_device_uio (vlib_main_t * vm, linux_pci_device_t * p, p->addr.as_u32 = di->addr.as_u32; p->fd = -1; + p->type = LINUX_PCI_DEVICE_TYPE_UIO; s = format (s, "%s/%U/config%c", sysfs_pci_dev_path, format_vlib_pci_addr, &di->addr, 0); @@ -736,6 +753,7 @@ add_device_vfio (vlib_main_t * vm, linux_pci_device_t * p, u8 *s = 0; p->addr.as_u32 = di->addr.as_u32; + p->type = LINUX_PCI_DEVICE_TYPE_VFIO; if (di->driver_name == 0 || (strcmp ("vfio-pci", (char *) di->driver_name) != 0)) @@ -864,71 +882,95 @@ vlib_pci_read_write_config (vlib_pci_dev_handle_t h, } static clib_error_t * -vlib_pci_map_resource_int (vlib_pci_dev_handle_t h, - u32 resource, u8 * addr, void **result) +vlib_pci_map_region_int (vlib_pci_dev_handle_t h, + u32 bar, u8 * addr, void **result) { linux_pci_device_t *p = linux_pci_get_device (h); - struct stat stat_buf; - u8 *file_name; - int fd; + int fd = -1; clib_error_t *error; int flags = MAP_SHARED; + u64 size = 0, offset = 0; - error = 0; + ASSERT (bar <= 5); - file_name = format (0, "%s/%U/resource%d%c", sysfs_pci_dev_path, - format_vlib_pci_addr, &p->addr, resource, 0); + error = 0; - fd = open ((char *) file_name, O_RDWR); - if (fd < 0) + if (p->type == LINUX_PCI_DEVICE_TYPE_UIO) { - error = clib_error_return_unix (0, "open `%s'", file_name); - goto done; - } + u8 *file_name; + struct stat stat_buf; + file_name = format (0, "%s/%U/resource%d%c", sysfs_pci_dev_path, + format_vlib_pci_addr, &p->addr, bar, 0); - if (fstat (fd, &stat_buf) < 0) - { - error = clib_error_return_unix (0, "fstat `%s'", file_name); - goto done; - } + fd = open ((char *) file_name, O_RDWR); + if (fd < 0) + { + error = clib_error_return_unix (0, "open `%s'", file_name); + vec_free (file_name); + return error; + } - vec_validate (p->resource_fds, resource); - p->resource_fds[resource] = fd; - if (addr != 0) - flags |= MAP_FIXED; + if (fstat (fd, &stat_buf) < 0) + { + error = clib_error_return_unix (0, "fstat `%s'", file_name); + vec_free (file_name); + close (fd); + return error; + } - *result = mmap (addr, - /* size */ stat_buf.st_size, - PROT_READ | PROT_WRITE, flags, - /* file */ fd, - /* offset */ 0); - if (*result == (void *) -1) + vec_free (file_name); + if (addr != 0) + flags |= MAP_FIXED; + size = stat_buf.st_size; + offset = 0; + } + else if (p->type == LINUX_PCI_DEVICE_TYPE_VFIO) { - error = clib_error_return_unix (0, "mmap `%s'", file_name); - goto done; + struct vfio_region_info reg = { 0 }; + reg.argsz = sizeof (struct vfio_region_info); + reg.index = bar; + if (ioctl (p->fd, VFIO_DEVICE_GET_REGION_INFO, ®) < 0) + return clib_error_return_unix (0, "ioctl(VFIO_DEVICE_GET_INFO) " + "'%U'", format_vlib_pci_addr, + &p->addr); + fd = p->fd; + size = reg.size; + offset = reg.offset; } + else + ASSERT (0); -done: - if (error) + *result = mmap (addr, size, PROT_READ | PROT_WRITE, flags, fd, offset); + if (*result == (void *) -1) { - if (fd >= 0) + error = clib_error_return_unix (0, "mmap `BAR%u'", bar); + if (p->type == LINUX_PCI_DEVICE_TYPE_UIO) close (fd); + return error; } - vec_free (file_name); - return error; + + /* *INDENT-OFF* */ + vec_validate_init_empty (p->regions, bar, + (linux_pci_region_t) { .fd = -1}); + /* *INDENT-ON* */ + if (p->type == LINUX_PCI_DEVICE_TYPE_UIO) + p->regions[bar].fd = fd; + p->regions[bar].addr = *result; + p->regions[bar].size = size; + return 0; } clib_error_t * -vlib_pci_map_resource (vlib_pci_dev_handle_t h, u32 resource, void **result) +vlib_pci_map_region (vlib_pci_dev_handle_t h, u32 resource, void **result) { - return (vlib_pci_map_resource_int (h, resource, 0 /* addr */ , result)); + return (vlib_pci_map_region_int (h, resource, 0 /* addr */ , result)); } clib_error_t * -vlib_pci_map_resource_fixed (vlib_pci_dev_handle_t h, - u32 resource, u8 * addr, void **result) +vlib_pci_map_region_fixed (vlib_pci_dev_handle_t h, u32 resource, u8 * addr, + void **result) { - return (vlib_pci_map_resource_int (h, resource, addr, result)); + return (vlib_pci_map_region_int (h, resource, addr, result)); } void -- cgit 1.2.3-korg