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From: Anatoly Burakov <anatoly.burakov@intel.com>
To: dev@dpdk.org
Cc: keith.wiles@intel.com, jianfeng.tan@intel.com, andras.kovacs@ericsson.com,
laszlo.vadkeri@ericsson.com, benjamin.walker@intel.com,
bruce.richardson@intel.com, thomas@monjalon.net,
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yskoh@mellanox.com, pepperjo@japf.ch, jerin.jacob@caviumnetworks.com,
hemant.agrawal@nxp.com, olivier.matz@6wind.com, shreyansh.jain@nxp.com,
gowrishankar.m@linux.vnet.ibm.com
Date: Mon, 9 Apr 2018 19:00:39 +0100
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Subject: [dpdk-dev] [PATCH v5 36/70] eal: add iova2virt function
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This is reverse lookup of PA to VA. Using this will make
other code less dependent on internals of mem API.
Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Tested-by: Santosh Shukla <Santosh.Shukla@caviumnetworks.com>
Tested-by: Hemant Agrawal <hemant.agrawal@nxp.com>
---
lib/librte_eal/common/eal_common_memory.c | 30 ++++++++++++++++++++++++++++++
lib/librte_eal/common/include/rte_memory.h | 12 ++++++++++++
lib/librte_eal/rte_eal_version.map | 1 +
3 files changed, 43 insertions(+)
diff --git a/lib/librte_eal/common/eal_common_memory.c b/lib/librte_eal/common/eal_common_memory.c
index 4b528b0..ea3c5a7 100644
--- a/lib/librte_eal/common/eal_common_memory.c
+++ b/lib/librte_eal/common/eal_common_memory.c
@@ -131,6 +131,36 @@ rte_eal_get_physmem_layout(void)
return rte_eal_get_configuration()->mem_config->memseg;
}
+struct virtiova {
+ rte_iova_t iova;
+ void *virt;
+};
+static int
+find_virt(const struct rte_memseg *ms, void *arg)
+{
+ struct virtiova *vi = arg;
+ if (vi->iova >= ms->iova && vi->iova < (ms->iova + ms->len)) {
+ size_t offset = vi->iova - ms->iova;
+ vi->virt = RTE_PTR_ADD(ms->addr, offset);
+ /* stop the walk */
+ return 1;
+ }
+ return 0;
+}
+
+__rte_experimental void *
+rte_mem_iova2virt(rte_iova_t iova)
+{
+ struct virtiova vi;
+
+ memset(&vi, 0, sizeof(vi));
+
+ vi.iova = iova;
+ rte_memseg_walk(find_virt, &vi);
+
+ return vi.virt;
+}
+
static int
physmem_size(const struct rte_memseg *ms, void *arg)
{
diff --git a/lib/librte_eal/common/include/rte_memory.h b/lib/librte_eal/common/include/rte_memory.h
index 45d067f..5c60b91 100644
--- a/lib/librte_eal/common/include/rte_memory.h
+++ b/lib/librte_eal/common/include/rte_memory.h
@@ -131,6 +131,18 @@ phys_addr_t rte_mem_virt2phy(const void *virt);
rte_iova_t rte_mem_virt2iova(const void *virt);
/**
+ * Get virtual memory address corresponding to iova address.
+ *
+ * @param iova
+ * The iova address.
+ * @return
+ * Virtual address corresponding to iova address (or NULL if address does not
+ * exist within DPDK memory map).
+ */
+__rte_experimental void *
+rte_mem_iova2virt(rte_iova_t iova);
+
+/**
* Memseg walk function prototype.
*
* Returning 0 will continue walk
diff --git a/lib/librte_eal/rte_eal_version.map b/lib/librte_eal/rte_eal_version.map
index 93033b5..dccfc35 100644
--- a/lib/librte_eal/rte_eal_version.map
+++ b/lib/librte_eal/rte_eal_version.map
@@ -223,6 +223,7 @@ EXPERIMENTAL {
rte_eal_mbuf_user_pool_ops;
rte_log_register_type_and_pick_level;
rte_malloc_dump_heaps;
+ rte_mem_iova2virt;
rte_memseg_contig_walk;
rte_memseg_walk;
rte_mp_action_register;
--
2.7.4