From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yuanhan Liu Subject: Re: [ [PATCH v2] 11/13] virtio_ioport: armv7/v8: mmap virtio iopci bar region Date: Wed, 16 Dec 2015 21:29:40 +0800 Message-ID: <20151216132940.GT29571@yliu-dev.sh.intel.com> References: <1450098032-21198-1-git-send-email-sshukla@mvista.com> <1450098032-21198-12-git-send-email-sshukla@mvista.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: dev@dpdk.org, Rakesh Krishnamurthy , Rizwan Ansari To: Santosh Shukla Return-path: Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by dpdk.org (Postfix) with ESMTP id C3A478E5E for ; Wed, 16 Dec 2015 14:29:28 +0100 (CET) Content-Disposition: inline In-Reply-To: <1450098032-21198-12-git-send-email-sshukla@mvista.com> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On Mon, Dec 14, 2015 at 06:30:30PM +0530, Santosh Shukla wrote: > Introducing module to mmap iopci bar region. Applicable for linuxapp for non-x86 > archs, Tested for arm64/ThunderX platform for linux. For that adding two global > api. > - virtio_ioport_init > - virtio_ioport_unmap > > Signed-off-by: Santosh Shukla > Signed-off-by: Rizwan Ansari > Signed-off-by: Rakesh Krishnamurthy > --- > drivers/net/virtio/Makefile | 1 + > drivers/net/virtio/virtio_ioport.c | 163 ++++++++++++++++++++++++++++++++++++ > drivers/net/virtio/virtio_ioport.h | 42 ++++++++++ > 3 files changed, 206 insertions(+) > create mode 100644 drivers/net/virtio/virtio_ioport.c > create mode 100644 drivers/net/virtio/virtio_ioport.h > > diff --git a/drivers/net/virtio/Makefile b/drivers/net/virtio/Makefile > index 25a842d..5cba6d3 100644 > --- a/drivers/net/virtio/Makefile > +++ b/drivers/net/virtio/Makefile > @@ -50,6 +50,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtqueue.c > SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_pci.c > SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_rxtx.c > SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_ethdev.c > +SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_ioport.c > SRCS-$(CONFIG_RTE_VIRTIO_INC_VECTOR) += virtio_rxtx_simple.c > > # this lib depends upon: > diff --git a/drivers/net/virtio/virtio_ioport.c b/drivers/net/virtio/virtio_ioport.c > new file mode 100644 > index 0000000..ffeb8e9 > --- /dev/null > +++ b/drivers/net/virtio/virtio_ioport.c > @@ -0,0 +1,163 @@ > +/* > + * BSD LICENSE > + * > + * Copyright(c) 2015 Cavium Networks. 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 "virtio_ioport.h" > + > +#if defined(RTE_EXEC_ENV_LINUXAPP) && (defined(RTE_ARCH_ARM) || \ > + defined(RTE_ARCH_ARM64)) > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#include "virtio_logs.h" > + > +/* start address of first pci_iobar slot (user-space virtual-addres) */ > +void *ioport_map; You still forgot "static"? > +/** > + * ioport map count, > + * Use-case: virtio-net-pci. How about removing above two lines; it's quite meaningless here, but instead a bit redundant. > + * Keeps track of number of virtio-net-pci device mapped/unmapped. Max device > + * support by linux kernel is 31, so ioport_map_cnt can not be greater than 31. > + */ > +static int ioport_map_cnt; > + > +static int > +virtio_map_ioport(void **resource_addr) > +{ > + int fd; > + int ret = 0; > + > + /* avoid -Werror=unused-parameter, keep compiler happy */ > + (void)resource_addr; Using __rte_unused is more elegant. > + fd = open(VIRT_IOPORT_DEV, O_RDWR); > + if (fd < 0) { > + PMD_INIT_LOG(ERR, "device file %s open error: %d\n", > + DEV_NAME, fd); > + ret = -1; > + goto out; > + } > + > + ioport_map = mmap(NULL, PCI_VIRT_IOPORT_SIZE, > + PROT_EXEC | PROT_WRITE | PROT_READ, MAP_SHARED, fd, 0); > + > + if (ioport_map == MAP_FAILED) { > + PMD_INIT_LOG(ERR, "mmap: failed to map bar Address=%p\n", > + *resource_addr); > + ret = -ENOMEM; > + goto out1; > + } > + > + PMD_INIT_LOG(INFO, "First pci_iobar mapped at %p\n", ioport_map); > + > +out1: > + close(fd); > +out: > + return ret; > +} > + > +static int > +virtio_set_ioport_addr(void **resource_addr, unsigned long offset) > +{ > + int ret = 0; > + > + if (ioport_map_cnt >= PCI_VIRT_IOPORT_MAX) { > + ret = -1; > + PMD_INIT_LOG(ERR, > + "ioport_map_cnt(%d) greater than" > + "PCI_VIRT_IOPORT_MAX(%d)\n", > + ioport_map_cnt, PCI_VIRT_IOPORT_MAX); > + return ret; > + } > + *resource_addr = (void *)((char *)ioport_map + (ioport_map_cnt)*offset); Redundant (), and the void * cast seems to be unnecessary. > + ioport_map_cnt++; > + > + PMD_INIT_LOG(DEBUG, "pci.resource_addr %p ioport_map_cnt %d\n", > + *resource_addr, ioport_map_cnt); > + return ret; > +} > + > +int virtio_ioport_init(struct rte_pci_resource *mem_resource) > +{ > + int ret = 0; > + > + /** > + * Map the all IOBAR entry from /proc/ioport to 4k page_size only once. > + * Later virtio_set_ioport_addr() func will update correct bar_addr for > + * each ioport (i.e..pci_dev->mem_resource[0].addr) > + */ > + if (!ioport_map) { > + ret = virtio_map_ioport(&mem_resource->addr); > + if (ret < 0) > + return ret; > + PMD_INIT_LOG(INFO, "ioport_map %p\n", ioport_map); > + } > + > + ret = virtio_set_ioport_addr(&mem_resource->addr, mem_resource->len); > + if (ret < 0) > + return ret; > + > + PMD_INIT_LOG(INFO, "resource_addr %p resource_len :%ld\n", > + mem_resource->addr, (unsigned long)mem_resource->len); > + return ret; > +} > + > +void virtio_ioport_unmap(void) > +{ > + /* unmap ioport memory */ Redundant comment. > + ioport_map_cnt--; > + if (!ioport_map_cnt) > + munmap(ioport_map, PCI_VIRT_IOPORT_SIZE); > + > + PMD_INIT_LOG(DEBUG, "unmapping ioport_mem %d\n", ioport_map_cnt); > +} > + > +#else /* !LINUXAPP && !ARM/64 */ > + > +int virtio_ioport_init(struct rte_pci_resource *mem_resource) > +{ > + (void)mem_resource; ditto. > + return 0; > +} > + > +void virtio_ioport_unmap(void) > +{ > + return; > +} > + > +#endif /* LINUXAPP, ARM/64 */ > diff --git a/drivers/net/virtio/virtio_ioport.h b/drivers/net/virtio/virtio_ioport.h > new file mode 100644 > index 0000000..bf79551 > --- /dev/null > +++ b/drivers/net/virtio/virtio_ioport.h > @@ -0,0 +1,42 @@ > +/* > + * BSD LICENSE > + * > + * Copyright(c) 2015 Cavium Networks. 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. > + * > + */ > +#ifndef _VIRTIO_IOPORT_H_ > +#define _VIRTIO_IOPORT_H_ > + > +#include > + > +int virtio_ioport_init(struct rte_pci_resource *mem_resource); > +void virtio_ioport_unmap(void); > + > +#endif /* _VIRTIO_IOPORT_H_ */ > -- > 1.7.9.5