@@ -59,6 +59,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_log.c
SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_pci.c
SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_pci_uio.c
SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_pci_vfio.c
+SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_pci_vfio_dma.c
SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_pci_vfio_mp_sync.c
SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_debug.c
SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_lcore.c
@@ -112,6 +112,28 @@ struct vfio_config {
struct vfio_group vfio_groups[VFIO_MAX_GROUPS];
};
+/* function pointer typedef for DMA mapping functions */
+typedef int (*vfio_dma_func_t)(int);
+
+/* Structure to hold supported IOMMU types */
+struct vfio_iommu_type {
+ int type_id;
+ const char *name;
+ vfio_dma_func_t dma_map_func;
+};
+
+/* function prototypes for different IOMMU types */
+int vfio_iommu_type1_dma_map(int container_fd);
+int vfio_iommu_noiommu_dma_map(int container_fd);
+
+/* IOMMU types we support */
+static const struct vfio_iommu_type iommu_types[] = {
+ /* x86 IOMMU, otherwise known as type 1 */
+ { VFIO_TYPE1_IOMMU, "Type 1", &vfio_iommu_type1_dma_map},
+ /* IOMMU-less mode */
+ { VFIO_NOIOMMU_IOMMU, "No-IOMMU", &vfio_iommu_noiommu_dma_map},
+};
+
#endif
#endif /* EAL_PCI_INIT_H_ */
@@ -72,6 +72,7 @@ EAL_REGISTER_TAILQ(rte_vfio_tailq)
#define VFIO_DIR "/dev/vfio"
#define VFIO_CONTAINER_PATH "/dev/vfio/vfio"
#define VFIO_GROUP_FMT "/dev/vfio/%u"
+#define VFIO_NOIOMMU_GROUP_FMT "/dev/vfio/noiommu-%u"
#define VFIO_GET_REGION_ADDR(x) ((uint64_t) x << 40ULL)
/* per-process VFIO config */
@@ -236,42 +237,58 @@ pci_vfio_set_bus_master(int dev_fd)
return 0;
}
-/* set up DMA mappings */
-static int
-pci_vfio_setup_dma_maps(int vfio_container_fd)
-{
- const struct rte_memseg *ms = rte_eal_get_physmem_layout();
- int i, ret;
-
- ret = ioctl(vfio_container_fd, VFIO_SET_IOMMU,
- VFIO_TYPE1_IOMMU);
- if (ret) {
- RTE_LOG(ERR, EAL, " cannot set IOMMU type, "
- "error %i (%s)\n", errno, strerror(errno));
- return -1;
+/* pick IOMMU type. returns a pointer to vfio_iommu_type or NULL for error */
+static const struct vfio_iommu_type *
+pci_vfio_set_iommu_type(int vfio_container_fd) {
+ unsigned idx;
+ for (idx = 0; idx < RTE_DIM(iommu_types); idx++) {
+ const struct vfio_iommu_type *t = &iommu_types[idx];
+
+ int ret = ioctl(vfio_container_fd, VFIO_SET_IOMMU,
+ t->type_id);
+ if (!ret) {
+ RTE_LOG(NOTICE, EAL, " using IOMMU type %d (%s)\n",
+ t->type_id, t->name);
+ return t;
+ }
+ /* not an error, there may be more supported IOMMU types */
+ RTE_LOG(DEBUG, EAL, " set IOMMU type %d (%s) failed, "
+ "error %i (%s)\n", t->type_id, t->name, errno,
+ strerror(errno));
}
+ /* if we didn't find a suitable IOMMU type, fail */
+ return NULL;
+}
- /* map all DPDK segments for DMA. use 1:1 PA to IOVA mapping */
- for (i = 0; i < RTE_MAX_MEMSEG; i++) {
- struct vfio_iommu_type1_dma_map dma_map;
-
- if (ms[i].addr == NULL)
- break;
-
- memset(&dma_map, 0, sizeof(dma_map));
- dma_map.argsz = sizeof(struct vfio_iommu_type1_dma_map);
- dma_map.vaddr = ms[i].addr_64;
- dma_map.size = ms[i].len;
- dma_map.iova = ms[i].phys_addr;
- dma_map.flags = VFIO_DMA_MAP_FLAG_READ | VFIO_DMA_MAP_FLAG_WRITE;
-
- ret = ioctl(vfio_container_fd, VFIO_IOMMU_MAP_DMA, &dma_map);
+/* check if we have any supported extensions */
+static int
+pci_vfio_has_supported_extensions(int vfio_container_fd) {
+ int ret;
+ unsigned idx, n_extensions = 0;
+ for (idx = 0; idx < RTE_DIM(iommu_types); idx++) {
+ const struct vfio_iommu_type *t = &iommu_types[idx];
- if (ret) {
- RTE_LOG(ERR, EAL, " cannot set up DMA remapping, "
- "error %i (%s)\n", errno, strerror(errno));
+ ret = ioctl(vfio_container_fd, VFIO_CHECK_EXTENSION,
+ t->type_id);
+ if (ret < 0) {
+ RTE_LOG(ERR, EAL, " could not get IOMMU type, "
+ "error %i (%s)\n", errno,
+ strerror(errno));
+ close(vfio_container_fd);
return -1;
+ } else if (ret == 1) {
+ /* we found a supported extension */
+ n_extensions++;
}
+ RTE_LOG(DEBUG, EAL, " IOMMU type %d (%s) is %s\n",
+ t->type_id, t->name,
+ ret ? "supported" : "not supported");
+ }
+
+ /* if we didn't find any supported IOMMU types, fail */
+ if (!n_extensions) {
+ close(vfio_container_fd);
+ return -1;
}
return 0;
@@ -400,17 +417,10 @@ pci_vfio_get_container_fd(void)
return -1;
}
- /* check if we support IOMMU type 1 */
- ret = ioctl(vfio_container_fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU);
- if (ret != 1) {
- if (ret < 0)
- RTE_LOG(ERR, EAL, " could not get IOMMU type, "
- "error %i (%s)\n", errno,
- strerror(errno));
- else
- RTE_LOG(ERR, EAL, " unsupported IOMMU type "
- "detected in VFIO\n");
- close(vfio_container_fd);
+ ret = pci_vfio_has_supported_extensions(vfio_container_fd);
+ if (ret) {
+ RTE_LOG(ERR, EAL, " no supported IOMMU "
+ "extensions found!\n");
return -1;
}
@@ -460,6 +470,7 @@ pci_vfio_get_group_fd(int iommu_group_no)
/* if primary, try to open the group */
if (internal_config.process_type == RTE_PROC_PRIMARY) {
+ /* try regular group format */
snprintf(filename, sizeof(filename),
VFIO_GROUP_FMT, iommu_group_no);
vfio_group_fd = open(filename, O_RDWR);
@@ -470,7 +481,20 @@ pci_vfio_get_group_fd(int iommu_group_no)
strerror(errno));
return -1;
}
- return 0;
+
+ /* special case: try no-IOMMU path as well */
+ snprintf(filename, sizeof(filename),
+ VFIO_NOIOMMU_GROUP_FMT, iommu_group_no);
+ vfio_group_fd = open(filename, O_RDWR);
+ if (vfio_group_fd < 0) {
+ if (errno != ENOENT) {
+ RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", filename,
+ strerror(errno));
+ return -1;
+ }
+ return 0;
+ }
+ /* noiommu group found */
}
/* if the fd is valid, create a new group for it */
@@ -689,14 +713,21 @@ pci_vfio_map_resource(struct rte_pci_device *dev)
}
/*
- * set up DMA mappings for container
+ * pick an IOMMU type and set up DMA mappings for container
*
* needs to be done only once, only when at least one group is assigned to
* a container and only in primary process
*/
if (internal_config.process_type == RTE_PROC_PRIMARY &&
vfio_cfg.vfio_container_has_dma == 0) {
- ret = pci_vfio_setup_dma_maps(vfio_cfg.vfio_container_fd);
+ /* select an IOMMU type which we will be using */
+ const struct vfio_iommu_type *t =
+ pci_vfio_set_iommu_type(vfio_cfg.vfio_container_fd);
+ if (!t) {
+ RTE_LOG(ERR, EAL, " %s failed to select IOMMU type\n", pci_addr);
+ return -1;
+ }
+ ret = t->dma_map_func(vfio_cfg.vfio_container_fd);
if (ret) {
RTE_LOG(ERR, EAL, " %s DMA remapping failed, "
"error %i (%s)\n", pci_addr, errno, strerror(errno));
@@ -935,35 +966,41 @@ pci_vfio_enable(void)
{
/* initialize group list */
int i;
- int module_vfio_type1;
+ int vfio_available;
for (i = 0; i < VFIO_MAX_GROUPS; i++) {
vfio_cfg.vfio_groups[i].fd = -1;
vfio_cfg.vfio_groups[i].group_no = -1;
}
- module_vfio_type1 = rte_eal_check_module("vfio_iommu_type1");
+ /* inform the user that we are probing for VFIO */
+ RTE_LOG(INFO, EAL, "Probing VFIO support...\n");
+
+ /* check if vfio-pci module is loaded */
+ vfio_available = rte_eal_check_module("vfio_pci");
/* return error directly */
- if (module_vfio_type1 == -1) {
+ if (vfio_available == -1) {
RTE_LOG(INFO, EAL, "Could not get loaded module details!\n");
return -1;
}
/* return 0 if VFIO modules not loaded */
- if (module_vfio_type1 == 0) {
- RTE_LOG(INFO, EAL, "VFIO modules not all loaded, "
- "skip VFIO support...\n");
+ if (vfio_available == 0) {
+ RTE_LOG(INFO, EAL, "VFIO modules not loaded, "
+ "skipping VFIO support...\n");
return 0;
}
vfio_cfg.vfio_container_fd = pci_vfio_get_container_fd();
/* check if we have VFIO driver enabled */
- if (vfio_cfg.vfio_container_fd != -1)
+ if (vfio_cfg.vfio_container_fd != -1) {
+ RTE_LOG(NOTICE, EAL, "VFIO support initialized\n");
vfio_cfg.vfio_enabled = 1;
- else
+ } else {
RTE_LOG(NOTICE, EAL, "VFIO support could not be initialized\n");
+ }
return 0;
}
new file mode 100644
@@ -0,0 +1,84 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <string.h>
+#include <sys/ioctl.h>
+
+#include <rte_log.h>
+#include <rte_pci.h>
+#include <rte_eal_memconfig.h>
+
+#include "eal_pci_init.h"
+
+#ifdef VFIO_PRESENT
+
+int
+vfio_iommu_type1_dma_map(int vfio_container_fd)
+{
+ const struct rte_memseg *ms = rte_eal_get_physmem_layout();
+ int i, ret;
+
+ /* map all DPDK segments for DMA. use 1:1 PA to IOVA mapping */
+ for (i = 0; i < RTE_MAX_MEMSEG; i++) {
+ struct vfio_iommu_type1_dma_map dma_map;
+
+ if (ms[i].addr == NULL)
+ break;
+
+ memset(&dma_map, 0, sizeof(dma_map));
+ dma_map.argsz = sizeof(struct vfio_iommu_type1_dma_map);
+ dma_map.vaddr = ms[i].addr_64;
+ dma_map.size = ms[i].len;
+ dma_map.iova = ms[i].phys_addr;
+ dma_map.flags = VFIO_DMA_MAP_FLAG_READ | VFIO_DMA_MAP_FLAG_WRITE;
+
+ ret = ioctl(vfio_container_fd, VFIO_IOMMU_MAP_DMA, &dma_map);
+
+ if (ret) {
+ RTE_LOG(ERR, EAL, " cannot set up DMA remapping, "
+ "error %i (%s)\n", errno, strerror(errno));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+int
+vfio_iommu_noiommu_dma_map(int __rte_unused vfio_container_fd)
+{
+ /* No-IOMMU mode does not need DMA mapping */
+ return 0;
+}
+
+#endif
@@ -52,6 +52,11 @@
#define RTE_PCI_MSIX_FLAGS_QSIZE PCI_MSIX_FLAGS_QSIZE
#endif
+/* older kernels may not have no-IOMMU mode */
+#ifndef VFIO_NOIOMMU_IOMMU
+#define VFIO_NOIOMMU_IOMMU 8
+#endif
+
#define VFIO_PRESENT
#endif /* kernel version */
#endif /* RTE_EAL_VFIO */