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From: Santosh Shukla <santosh.shukla@caviumnetworks.com>
To: dev@dpdk.org
Cc: olivier.matz@6wind.com, thomas@monjalon.net,
jerin.jacob@caviumnetworks.com, hemant.agrawal@nxp.com,
maxime.coquelin@redhat.com, sergio.gonzalez.monroy@intel.com,
bruce.richardson@intel.com, shreyansh.jain@nxp.com, gaetan.rivet@6wind.com,
anatoly.burakov@intel.com, stephen@networkplumber.org,
Santosh Shukla <santosh.shukla@caviumnetworks.com>
Date: Mon, 14 Aug 2017 21:40:53 +0530
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Subject: [dpdk-dev] [PATCH v6 06/12] bus: get iommu class
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API(rte_bus_get_iommu_class) helps to automatically detect and select
appropriate iova mapping scheme for iommu capable device on that bus.
Algorithm for iova scheme selection for bus:
0. Iterate through bus_list.
1. Collect each bus iova mode value and update into 'mode' var.
2. Mode selection scheme is:
if mode == 0 then iova mode is _pa,
if mode == 1 then iova mode is _pa,
if mode == 2 then iova mode is _va,
if mode == 3 then iova mode ia _pa.
So mode !=2 will be default iova mode (_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>
---
lib/librte_eal/bsdapp/eal/rte_eal_version.map | 1 +
lib/librte_eal/common/eal_common_bus.c | 23 +++++++++++++++++++++++
lib/librte_eal/common/eal_common_pci.c | 1 +
lib/librte_eal/common/include/rte_bus.h | 25 +++++++++++++++++++++++++
lib/librte_eal/linuxapp/eal/rte_eal_version.map | 1 +
5 files changed, 51 insertions(+)
diff --git a/lib/librte_eal/bsdapp/eal/rte_eal_version.map b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
index 1fdcfb460..9942f47aa 100644
--- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
@@ -243,5 +243,6 @@ DPDK_17.11 {
rte_pci_match;
rte_pci_get_iommu_class;
+ rte_bus_get_iommu_class;
} DPDK_17.08;
diff --git a/lib/librte_eal/common/eal_common_bus.c b/lib/librte_eal/common/eal_common_bus.c
index 08bec2d93..a30a8982e 100644
--- a/lib/librte_eal/common/eal_common_bus.c
+++ b/lib/librte_eal/common/eal_common_bus.c
@@ -222,3 +222,26 @@ rte_bus_find_by_device_name(const char *str)
c[0] = '\0';
return rte_bus_find(NULL, bus_can_parse, name);
}
+
+
+/*
+ * Get iommu class of devices on the bus.
+ */
+enum rte_iova_mode
+rte_bus_get_iommu_class(void)
+{
+ int mode = RTE_IOVA_DC;
+ struct rte_bus *bus;
+
+ TAILQ_FOREACH(bus, &rte_bus_list, next) {
+
+ if (bus->get_iommu_class)
+ mode |= bus->get_iommu_class();
+ }
+
+ if (mode != RTE_IOVA_VA) {
+ /* Use default IOVA mode */
+ mode = RTE_IOVA_PA;
+ }
+ return mode;
+}
diff --git a/lib/librte_eal/common/eal_common_pci.c b/lib/librte_eal/common/eal_common_pci.c
index 3b7d0a0ee..0f0e4b93b 100644
--- a/lib/librte_eal/common/eal_common_pci.c
+++ b/lib/librte_eal/common/eal_common_pci.c
@@ -564,6 +564,7 @@ struct rte_pci_bus rte_pci_bus = {
.plug = pci_plug,
.unplug = pci_unplug,
.parse = pci_parse,
+ .get_iommu_class = rte_pci_get_iommu_class,
},
.device_list = TAILQ_HEAD_INITIALIZER(rte_pci_bus.device_list),
.driver_list = TAILQ_HEAD_INITIALIZER(rte_pci_bus.driver_list),
diff --git a/lib/librte_eal/common/include/rte_bus.h b/lib/librte_eal/common/include/rte_bus.h
index 9e40687e5..70a291a4d 100644
--- a/lib/librte_eal/common/include/rte_bus.h
+++ b/lib/librte_eal/common/include/rte_bus.h
@@ -178,6 +178,20 @@ struct rte_bus_conf {
enum rte_bus_scan_mode scan_mode; /**< Scan policy. */
};
+
+/**
+ * Get common iommu class of the all the devices on the bus. The bus may
+ * check that those devices are attached to iommu driver.
+ * If no devices are attached to the bus. The bus may return with don't care
+ * (_DC) value.
+ * Otherwise, The bus will return appropriate _pa or _va iova mode.
+ *
+ * @return
+ * enum rte_iova_mode value.
+ */
+typedef enum rte_iova_mode (*rte_bus_get_iommu_class_t)(void);
+
+
/**
* A structure describing a generic bus.
*/
@@ -191,6 +205,7 @@ struct rte_bus {
rte_bus_unplug_t unplug; /**< Remove single device from driver */
rte_bus_parse_t parse; /**< Parse a device name */
struct rte_bus_conf conf; /**< Bus configuration */
+ rte_bus_get_iommu_class_t get_iommu_class; /**< Get iommu class */
};
/**
@@ -290,6 +305,16 @@ struct rte_bus *rte_bus_find_by_device(const struct rte_device *dev);
*/
struct rte_bus *rte_bus_find_by_name(const char *busname);
+
+/**
+ * Get the common iommu class of devices bound on to buses available in the
+ * system. The default mode is PA.
+ *
+ * @return
+ * enum rte_iova_mode value.
+ */
+enum rte_iova_mode rte_bus_get_iommu_class(void);
+
/**
* Helper for Bus registration.
* The constructor has higher priority than PMD constructors.
diff --git a/lib/librte_eal/linuxapp/eal/rte_eal_version.map b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
index 40420ded3..f35031746 100644
--- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
@@ -248,5 +248,6 @@ DPDK_17.11 {
rte_pci_match;
rte_pci_get_iommu_class;
+ rte_bus_get_iommu_class;
} DPDK_17.08;
--
2.11.0