--- /dev/null
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ * pci.c: Linux user space PCI bus management.
+ *
+ * Copyright (c) 2008 Eliot Dresselhaus
+ *
+ * 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 <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <linux/vfio.h>
+#include <sys/ioctl.h>
+
+#include <vppinfra/linux/sysfs.h>
+
+#include <vlib/vlib.h>
+#include <vlib/unix/unix.h>
+#include <vlib/pci/pci.h>
+#include <vlib/linux/vfio.h>
+#include <vlib/physmem.h>
+
+linux_vfio_main_t vfio_main;
+
+static int
+map_regions (vlib_main_t * vm, int fd)
+{
+ vlib_physmem_main_t *vpm = &vm->physmem_main;
+ vlib_physmem_region_t *pr;
+ struct vfio_iommu_type1_dma_map dm = { 0 };
+ int i;
+
+ dm.argsz = sizeof (struct vfio_iommu_type1_dma_map);
+ dm.flags = VFIO_DMA_MAP_FLAG_READ | VFIO_DMA_MAP_FLAG_WRITE;
+
+ /* *INDENT-OFF* */
+ pool_foreach (pr, vpm->regions,
+ {
+ vec_foreach_index (i, pr->page_table)
+ {
+ int rv;
+ dm.vaddr = pointer_to_uword (pr->mem) + (i << pr->log2_page_size);
+ dm.size = 1 << pr->log2_page_size;
+ dm.iova = pr->page_table[i];
+ if ((rv = ioctl (fd, VFIO_IOMMU_MAP_DMA, &dm)))
+ return rv;
+ }
+ });
+ /* *INDENT-ON* */
+ return 0;
+}
+
+static clib_error_t *
+scan_vfio_fd (void *arg, u8 * path_name, u8 * file_name)
+{
+ linux_vfio_main_t *lvm = &vfio_main;
+ const char fn[] = "/dev/vfio/vfio";
+ char buff[sizeof (fn)] = { 0 };
+ int fd;
+ u8 *path = format (0, "%v%c", path_name, 0);
+
+ if (readlink ((char *) path, buff, sizeof (fn)) + 1 != sizeof (fn))
+ goto done;
+
+ if (strncmp (fn, buff, sizeof (fn)))
+ goto done;
+
+ fd = atoi ((char *) file_name);
+ if (fd != lvm->container_fd)
+ lvm->ext_container_fd = atoi ((char *) file_name);
+
+done:
+ vec_free (path);
+ return 0;
+}
+
+void
+linux_vfio_dma_map_regions (vlib_main_t * vm)
+{
+ linux_vfio_main_t *lvm = &vfio_main;
+
+ if (lvm->container_fd != -1)
+ map_regions (vm, lvm->container_fd);
+
+ if (lvm->ext_container_fd == -1)
+ foreach_directory_file ("/proc/self/fd", scan_vfio_fd, 0, 0);
+
+ if (lvm->ext_container_fd != -1)
+ map_regions (vm, lvm->ext_container_fd);
+}
+
+static linux_pci_vfio_iommu_group_t *
+get_vfio_iommu_group (int group)
+{
+ linux_vfio_main_t *lvm = &vfio_main;
+ uword *p;
+
+ p = hash_get (lvm->iommu_pool_index_by_group, group);
+
+ return p ? pool_elt_at_index (lvm->iommu_groups, p[0]) : 0;
+}
+
+static clib_error_t *
+open_vfio_iommu_group (int group)
+{
+ linux_vfio_main_t *lvm = &vfio_main;
+ linux_pci_vfio_iommu_group_t *g;
+ clib_error_t *err = 0;
+ struct vfio_group_status group_status;
+ u8 *s = 0;
+ int fd;
+
+ g = get_vfio_iommu_group (group);
+ if (g)
+ {
+ g->refcnt++;
+ return 0;
+ }
+ s = format (s, "/dev/vfio/%u%c", group, 0);
+ fd = open ((char *) s, O_RDWR);
+ if (fd < 0)
+ return clib_error_return_unix (0, "open '%s'", s);
+
+ group_status.argsz = sizeof (group_status);
+ if (ioctl (fd, VFIO_GROUP_GET_STATUS, &group_status) < 0)
+ {
+ err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_GET_STATUS) '%s'",
+ s);
+ goto error;
+ }
+
+ if (!(group_status.flags & VFIO_GROUP_FLAGS_VIABLE))
+ {
+ err = clib_error_return (0, "iommu group %d is not viable (not all "
+ "devices in this group bound to vfio-pci)",
+ group);
+ goto error;
+ }
+
+ if (ioctl (fd, VFIO_GROUP_SET_CONTAINER, &lvm->container_fd) < 0)
+ {
+ err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_SET_CONTAINER) '%s'",
+ s);
+ goto error;
+ }
+
+ if (lvm->iommu_mode == 0)
+ {
+ if (ioctl (lvm->container_fd, VFIO_SET_IOMMU, VFIO_TYPE1_IOMMU) < 0)
+ {
+ err = clib_error_return_unix (0, "ioctl(VFIO_SET_IOMMU) "
+ "'/dev/vfio/vfio'");
+ goto error;
+ }
+ lvm->iommu_mode = VFIO_TYPE1_IOMMU;
+ }
+
+
+ pool_get (lvm->iommu_groups, g);
+ g->fd = fd;
+ g->refcnt = 1;
+ hash_set (lvm->iommu_pool_index_by_group, group, g - lvm->iommu_groups);
+ vec_free (s);
+ return 0;
+error:
+ close (fd);
+ return err;
+}
+
+clib_error_t *
+linux_vfio_group_get_device_fd (vlib_pci_addr_t * addr, int *fdp)
+{
+ clib_error_t *err = 0;
+ linux_pci_vfio_iommu_group_t *g;
+ u8 *s = 0;
+ int iommu_group;
+ u8 *tmpstr;
+ int fd;
+
+ s = format (s, "/sys/bus/pci/devices/%U/iommu_group", format_vlib_pci_addr,
+ addr);
+ tmpstr = clib_sysfs_link_to_name ((char *) s);
+ if (tmpstr)
+ {
+ iommu_group = atoi ((char *) tmpstr);
+ vec_free (tmpstr);
+ }
+ else
+ {
+ err = clib_error_return (0, "Cannot find IOMMU group for PCI device ",
+ "'%U'", format_vlib_pci_addr, addr);
+ goto error;
+ }
+ vec_reset_length (s);
+
+ if ((err = open_vfio_iommu_group (iommu_group)))
+ return err;
+
+ g = get_vfio_iommu_group (iommu_group);
+
+ s = format (s, "%U%c", format_vlib_pci_addr, addr, 0);
+ if ((fd = ioctl (g->fd, VFIO_GROUP_GET_DEVICE_FD, (char *) s)) < 0)
+ {
+ err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_GET_DEVICE_FD) '%U'",
+ format_vlib_pci_addr, addr);
+ goto error;
+ }
+ vec_reset_length (s);
+
+ *fdp = fd;
+
+error:
+ vec_free (s);
+ return err;
+}
+
+clib_error_t *
+linux_vfio_init (vlib_main_t * vm)
+{
+ linux_vfio_main_t *lvm = &vfio_main;
+ int fd;
+
+ lvm->ext_container_fd = -1;
+
+ fd = open ("/dev/vfio/vfio", O_RDWR);
+
+ /* check if iommu is available */
+ if (fd != -1)
+ {
+ if (ioctl (fd, VFIO_GET_API_VERSION) != VFIO_API_VERSION)
+ {
+ close (fd);
+ fd = -1;
+ }
+ else if (ioctl (fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU) == 1)
+ lvm->flags |= LINUX_VFIO_F_HAVE_IOMMU;
+ }
+
+ lvm->iommu_pool_index_by_group = hash_create (0, sizeof (uword));
+ lvm->container_fd = fd;
+ return 0;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
Code Review / vpp.git / blobdiff