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From: Santosh Shukla <santosh.shukla@caviumnetworks.com>
To: olivier.matz@6wind.com,
dev@dpdk.org
Cc: thomas@monjalon.net, jerin.jacob@caviumnetworks.com,
hemant.agrawal@nxp.com, aconole@redhat.com, stephen@networkplumber.org,
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maxime.coquelin@redhat.com,
Santosh Shukla <santosh.shukla@caviumnetworks.com>
Date: Fri, 6 Oct 2017 16:33:40 +0530
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Subject: [dpdk-dev] [PATCH v10 3/9] linuxapp/eal_pci: get iommu class
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Get iommu class of PCI device on the bus and returns preferred iova
mapping mode for that bus.
Patch also introduces RTE_PCI_DRV_IOVA_AS_VA drv flag.
Flag used when driver needs to operate in iova=va mode.
Algorithm for iova scheme selection for PCI bus:
0. If no device bound then return with RTE_IOVA_DC mapping mode,
else goto 1).
1. Look for device attached to vfio kdrv and has .drv_flag set
to RTE_PCI_DRV_IOVA_AS_VA.
2. Look for any device attached to UIO class of driver.
3. Check for vfio-noiommu mode enabled.
If 2) & 3) is false and 1) is true then select
mapping scheme as RTE_IOVA_VA. Otherwise use default
mapping scheme (RTE_IOVA_PA).
Signed-off-by: Santosh Shukla <santosh.shukla@caviumnetworks.com>
Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>
Reviewed-by: Anatoly Burakov <anatoly.burakov@intel.com>
Tested-by: Hemant Agrawal <hemant.agrawal@nxp.com>
---
lib/librte_eal/common/include/rte_pci.h | 2 +
lib/librte_eal/linuxapp/eal/eal_pci.c | 89 ++++++++++++++++++++++++++++++++-
lib/librte_eal/linuxapp/eal/eal_vfio.c | 19 +++++++
lib/librte_eal/linuxapp/eal/eal_vfio.h | 4 ++
4 files changed, 113 insertions(+), 1 deletion(-)
diff --git a/lib/librte_eal/common/include/rte_pci.h b/lib/librte_eal/common/include/rte_pci.h
index 0e36de093..a67d77f22 100644
--- a/lib/librte_eal/common/include/rte_pci.h
+++ b/lib/librte_eal/common/include/rte_pci.h
@@ -202,6 +202,8 @@ struct rte_pci_bus {
#define RTE_PCI_DRV_INTR_RMV 0x0010
/** Device driver needs to keep mapped resources if unsupported dev detected */
#define RTE_PCI_DRV_KEEP_MAPPED_RES 0x0020
+/** Device driver supports iova as va */
+#define RTE_PCI_DRV_IOVA_AS_VA 0X0040
/**
* A structure describing a PCI mapping.
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
index 26f2be822..b4dbf953a 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -45,6 +45,7 @@
#include "eal_filesystem.h"
#include "eal_private.h"
#include "eal_pci_init.h"
+#include "eal_vfio.h"
/**
* @file
@@ -488,11 +489,97 @@ rte_pci_scan(void)
}
/*
- * Get iommu class of pci devices on the bus.
+ * Is pci device bound to any kdrv
+ */
+static inline int
+pci_one_device_is_bound(void)
+{
+ struct rte_pci_device *dev = NULL;
+ int ret = 0;
+
+ FOREACH_DEVICE_ON_PCIBUS(dev) {
+ if (dev->kdrv == RTE_KDRV_UNKNOWN ||
+ dev->kdrv == RTE_KDRV_NONE) {
+ continue;
+ } else {
+ ret = 1;
+ break;
+ }
+ }
+ return ret;
+}
+
+/*
+ * Any one of the device bound to uio
+ */
+static inline int
+pci_one_device_bound_uio(void)
+{
+ struct rte_pci_device *dev = NULL;
+
+ FOREACH_DEVICE_ON_PCIBUS(dev) {
+ if (dev->kdrv == RTE_KDRV_IGB_UIO ||
+ dev->kdrv == RTE_KDRV_UIO_GENERIC) {
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/*
+ * Any one of the device has iova as va
+ */
+static inline int
+pci_one_device_has_iova_va(void)
+{
+ struct rte_pci_device *dev = NULL;
+ struct rte_pci_driver *drv = NULL;
+
+ FOREACH_DRIVER_ON_PCIBUS(drv) {
+ if (drv && drv->drv_flags & RTE_PCI_DRV_IOVA_AS_VA) {
+ FOREACH_DEVICE_ON_PCIBUS(dev) {
+ if (dev->kdrv == RTE_KDRV_VFIO &&
+ rte_pci_match(drv, dev))
+ return 1;
+ }
+ }
+ }
+ return 0;
+}
+
+/*
+ * Get iommu class of PCI devices on the bus.
*/
enum rte_iova_mode
rte_pci_get_iommu_class(void)
{
+ bool is_bound;
+ bool is_vfio_noiommu_enabled = true;
+ bool has_iova_va;
+ bool is_bound_uio;
+
+ is_bound = pci_one_device_is_bound();
+ if (!is_bound)
+ return RTE_IOVA_DC;
+
+ has_iova_va = pci_one_device_has_iova_va();
+ is_bound_uio = pci_one_device_bound_uio();
+#ifdef VFIO_PRESENT
+ is_vfio_noiommu_enabled = vfio_noiommu_is_enabled() == true ?
+ true : false;
+#endif
+
+ if (has_iova_va && !is_bound_uio && !is_vfio_noiommu_enabled)
+ return RTE_IOVA_VA;
+
+ if (has_iova_va) {
+ RTE_LOG(WARNING, EAL, "Some devices want iova as va but pa will be used because.. ");
+ if (is_vfio_noiommu_enabled)
+ RTE_LOG(WARNING, EAL, "vfio-noiommu mode configured\n");
+ if (is_bound_uio)
+ RTE_LOG(WARNING, EAL, "few device bound to UIO\n");
+ }
+
return RTE_IOVA_PA;
}
diff --git a/lib/librte_eal/linuxapp/eal/eal_vfio.c b/lib/librte_eal/linuxapp/eal/eal_vfio.c
index 946df7e31..c8a97b7e7 100644
--- a/lib/librte_eal/linuxapp/eal/eal_vfio.c
+++ b/lib/librte_eal/linuxapp/eal/eal_vfio.c
@@ -816,4 +816,23 @@ vfio_noiommu_dma_map(int __rte_unused vfio_container_fd)
return 0;
}
+int
+vfio_noiommu_is_enabled(void)
+{
+ int fd, ret, cnt __rte_unused;
+ char c;
+
+ ret = -1;
+ fd = open(VFIO_NOIOMMU_MODE, O_RDONLY);
+ if (fd < 0)
+ return -1;
+
+ cnt = read(fd, &c, 1);
+ if (c == 'Y')
+ ret = 1;
+
+ close(fd);
+ return ret;
+}
+
#endif
diff --git a/lib/librte_eal/linuxapp/eal/eal_vfio.h b/lib/librte_eal/linuxapp/eal/eal_vfio.h
index 5ff63e5d7..26ea8e119 100644
--- a/lib/librte_eal/linuxapp/eal/eal_vfio.h
+++ b/lib/librte_eal/linuxapp/eal/eal_vfio.h
@@ -150,6 +150,8 @@ struct vfio_config {
#define VFIO_NOIOMMU_GROUP_FMT "/dev/vfio/noiommu-%u"
#define VFIO_GET_REGION_ADDR(x) ((uint64_t) x << 40ULL)
#define VFIO_GET_REGION_IDX(x) (x >> 40)
+#define VFIO_NOIOMMU_MODE \
+ "/sys/module/vfio/parameters/enable_unsafe_noiommu_mode"
/* DMA mapping function prototype.
* Takes VFIO container fd as a parameter.
@@ -210,6 +212,8 @@ int pci_vfio_is_enabled(void);
int vfio_mp_sync_setup(void);
+int vfio_noiommu_is_enabled(void);
+
#define SOCKET_REQ_CONTAINER 0x100
#define SOCKET_REQ_GROUP 0x200
#define SOCKET_CLR_GROUP 0x300
--
2.14.1