From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anatoly Burakov Subject: [PATCH v3 36/68] eal: add iova2virt function Date: Wed, 4 Apr 2018 00:21:48 +0100 Message-ID: <5a839224a0935089537705c40082343c3bbfaa88.1522797505.git.anatoly.burakov@intel.com> References: 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, konstantin.ananyev@intel.com, kuralamudhan.ramakrishnan@intel.com, louise.m.daly@intel.com, nelio.laranjeiro@6wind.com, 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 To: dev@dpdk.org Return-path: Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by dpdk.org (Postfix) with ESMTP id 5CB841B8A1 for ; Wed, 4 Apr 2018 01:22:32 +0200 (CEST) In-Reply-To: In-Reply-To: References: List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" 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 --- 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 8409a3a..83b1635 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_memzone_reserve_contig; -- 2.7.4