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Date: Wed, 2 Aug 2017 15:30:10 +0800
From: Wu Hao <hao.wu@...el.com>
To: Moritz Fischer <moritz.fischer@...us.com>
Cc: Alan Tull <atull@...nel.org>, linux-fpga@...r.kernel.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-api@...r.kernel.org, luwei.kang@...el.com,
yi.z.zhang@...el.com, Tim Whisonant <tim.whisonant@...el.com>,
Enno Luebbers <enno.luebbers@...el.com>,
Shiva Rao <shiva.rao@...el.com>,
Christopher Rauer <christopher.rauer@...el.com>,
Xiao Guangrong <guangrong.xiao@...ux.intel.com>
Subject: Re: [PATCH v2 22/22] fpga: intel: afu: add FPGA_PORT_DMA_MAP/UNMAP
ioctls support
On Tue, Aug 01, 2017 at 11:15:48AM -0700, Moritz Fischer wrote:
> Hi Wu,
>
> couple of minor things inline below.
Hi Moritz,
Thanks a lot for your comments. :)
I will fix all the problems below in the next version patchset.
Thanks
Hao
>
> On Sun, Jun 25, 2017 at 6:52 PM, Wu Hao <hao.wu@...el.com> wrote:
> > DMA memory regions are required for Accelerated Function Unit (AFU) usage.
> > These two ioctls allow user space applications to map user memory regions
> > for dma, and unmap them after use. Iova is returned from driver to user
> > space application via FPGA_PORT_DMA_MAP ioctl. Application needs to unmap
> > it after use, otherwise, driver will unmap them in device file release
> > operation.
> >
> > All the mapped regions are managed via a rb tree.
> >
> > Ioctl interfaces:
> > * FPGA_PORT_DMA_MAP
> > Do the dma mapping per user_addr and length which provided by user.
> > Return iova in provided struct afu_port_dma_map.
> >
> > * FPGA_PORT_DMA_UNMAP
> > Unmap the dma region per iova provided by user.
> >
> > Signed-off-by: Tim Whisonant <tim.whisonant@...el.com>
> > Signed-off-by: Enno Luebbers <enno.luebbers@...el.com>
> > Signed-off-by: Shiva Rao <shiva.rao@...el.com>
> > Signed-off-by: Christopher Rauer <christopher.rauer@...el.com>
> > Signed-off-by: Xiao Guangrong <guangrong.xiao@...ux.intel.com>
> > Signed-off-by: Wu Hao <hao.wu@...el.com>
> > ---
> > v2: moved the code to drivers/fpga folder as suggested by Alan Tull.
> > switched to GPLv2 license.
> > fixed kbuild warnings.
> > ---
> > drivers/fpga/Makefile | 3 +-
> > drivers/fpga/intel-afu-dma-region.c | 372 ++++++++++++++++++++++++++++++++++++
> > drivers/fpga/intel-afu-main.c | 61 +++++-
> > drivers/fpga/intel-afu.h | 18 ++
> > include/uapi/linux/intel-fpga.h | 37 ++++
> > 5 files changed, 489 insertions(+), 2 deletions(-)
> > create mode 100644 drivers/fpga/intel-afu-dma-region.c
> >
> > diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
> > index 45c0538..339d1f3 100644
> > --- a/drivers/fpga/Makefile
> > +++ b/drivers/fpga/Makefile
> > @@ -38,4 +38,5 @@ obj-$(CONFIG_INTEL_FPGA_AFU) += intel-fpga-afu.o
> >
> > intel-fpga-pci-objs := intel-pcie.o intel-feature-dev.o
> > intel-fpga-fme-objs := intel-fme-main.o intel-fme-pr.o
> > -intel-fpga-afu-objs := intel-afu-main.o intel-afu-region.o
> > +intel-fpga-afu-objs := intel-afu-main.o intel-afu-region.o \
> > + intel-afu-dma-region.o
> > diff --git a/drivers/fpga/intel-afu-dma-region.c b/drivers/fpga/intel-afu-dma-region.c
> > new file mode 100644
> > index 0000000..982a9b5
> > --- /dev/null
> > +++ b/drivers/fpga/intel-afu-dma-region.c
> > @@ -0,0 +1,372 @@
> > +/*
> > + * Driver for Intel FPGA Accelerated Function Unit (AFU) DMA Region Management
> > + *
> > + * Copyright (C) 2017 Intel Corporation, Inc.
> > + *
> > + * Authors:
> > + * Wu Hao <hao.wu@...el.com>
> > + * Xiao Guangrong <guangrong.xiao@...ux.intel.com>
> > + *
> > + * This work is licensed under the terms of the GNU GPL version 2. See
> > + * the COPYING file in the top-level directory.
> > + */
> > +
> > +#include <linux/sched/signal.h>
> > +#include <linux/uaccess.h>
> > +
> > +#include "intel-afu.h"
> > +
> > +static void put_all_pages(struct page **pages, int npages)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < npages; i++)
> > + if (pages[i] != NULL)
>
> if (pages[i]) would do I think
>
> > + put_page(pages[i]);
> > +}
> > +
> > +void afu_dma_region_init(struct feature_platform_data *pdata)
> > +{
> > + struct fpga_afu *afu = fpga_pdata_get_private(pdata);
> > +
> > + afu->dma_regions = RB_ROOT;
> > +}
> > +
> > +static long afu_dma_adjust_locked_vm(struct device *dev, long npages, bool incr)
> > +{
> > + unsigned long locked, lock_limit;
> > + int ret = 0;
> > +
> > + /* the task is exiting. */
> > + if (!current->mm)
> > + return 0;
> > +
> > + down_write(¤t->mm->mmap_sem);
> > +
> > + if (incr) {
> > + locked = current->mm->locked_vm + npages;
> > + lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
> > +
> > + if (locked > lock_limit && !capable(CAP_IPC_LOCK))
> > + ret = -ENOMEM;
> > + else
> > + current->mm->locked_vm += npages;
> > + } else {
> > +
> > + if (WARN_ON_ONCE(npages > current->mm->locked_vm))
> > + npages = current->mm->locked_vm;
> > + current->mm->locked_vm -= npages;
> > + }
> > +
> > + dev_dbg(dev, "[%d] RLIMIT_MEMLOCK %c%ld %ld/%ld%s\n", current->pid,
> > + incr ? '+' : '-',
> > + npages << PAGE_SHIFT,
> > + current->mm->locked_vm << PAGE_SHIFT,
> > + rlimit(RLIMIT_MEMLOCK),
> > + ret ? "- execeeded" : "");
> > +
> > + up_write(¤t->mm->mmap_sem);
> > +
> > + return ret;
> > +}
> > +
> > +static long afu_dma_pin_pages(struct feature_platform_data *pdata,
> > + struct fpga_afu_dma_region *region)
> > +{
> > + long npages = region->length >> PAGE_SHIFT;
> > + struct device *dev = &pdata->dev->dev;
> > + long ret, pinned;
> > +
> > + ret = afu_dma_adjust_locked_vm(dev, npages, true);
> > + if (ret)
> > + return ret;
> > +
> > + region->pages = kcalloc(npages, sizeof(struct page *), GFP_KERNEL);
> > + if (!region->pages) {
> > + afu_dma_adjust_locked_vm(dev, npages, false);
>
> You could probably also just have another label in the error handling path.
> > + return -ENOMEM;
> > + }
> > +
> > + pinned = get_user_pages_fast(region->user_addr, npages, 1,
> > + region->pages);
> > + if (pinned < 0) {
> > + ret = pinned;
> > + goto err_put_pages;
> > + } else if (pinned != npages) {
> > + ret = -EFAULT;
> > + goto err;
> > + }
> > +
> > + dev_dbg(dev, "%ld pages pinned\n", pinned);
> > +
> > + return 0;
> > +
> > +err_put_pages:
> > + put_all_pages(region->pages, pinned);
> > +err:
> > + kfree(region->pages);
> > + afu_dma_adjust_locked_vm(dev, npages, false);
> > + return ret;
> > +}
> > +
> > +static void afu_dma_unpin_pages(struct feature_platform_data *pdata,
> > + struct fpga_afu_dma_region *region)
> > +{
> > + long npages = region->length >> PAGE_SHIFT;
> > + struct device *dev = &pdata->dev->dev;
> > +
> > + put_all_pages(region->pages, npages);
> > + kfree(region->pages);
> > + afu_dma_adjust_locked_vm(dev, npages, false);
> > +
> > + dev_dbg(dev, "%ld pages unpinned\n", npages);
> > +}
> > +
> > +static bool afu_dma_check_continuous_pages(struct fpga_afu_dma_region *region)
> > +{
> > + int npages = region->length >> PAGE_SHIFT;
> > + int i;
> > +
> > + for (i = 0; i < npages - 1; i++)
> > + if (page_to_pfn(region->pages[i]) + 1 !=
> > + page_to_pfn(region->pages[i+1]))
> > + return false;
> > +
> > + return true;
> > +}
> > +
> > +static bool dma_region_check_iova(struct fpga_afu_dma_region *region,
> > + u64 iova, u64 size)
> > +{
> > + if (!size && region->iova != iova)
> > + return false;
> > +
> > + return (region->iova <= iova) &&
> > + (region->length + region->iova >= iova + size);
> > +}
> > +
> > +/* Need to be called with pdata->lock held */
>
> Needs
> > +static int afu_dma_region_add(struct feature_platform_data *pdata,
> > + struct fpga_afu_dma_region *region)
> > +{
> > + struct fpga_afu *afu = fpga_pdata_get_private(pdata);
> > + struct rb_node **new, *parent = NULL;
> > +
> > + dev_dbg(&pdata->dev->dev, "add region (iova = %llx)\n",
> > + (unsigned long long)region->iova);
> > +
> > + new = &(afu->dma_regions.rb_node);
> > +
> > + while (*new) {
> > + struct fpga_afu_dma_region *this;
> > +
> > + this = container_of(*new, struct fpga_afu_dma_region, node);
> > +
> > + parent = *new;
> > +
> > + if (dma_region_check_iova(this, region->iova, region->length))
> > + return -EEXIST;
> > +
> > + if (region->iova < this->iova)
> > + new = &((*new)->rb_left);
> > + else if (region->iova > this->iova)
> > + new = &((*new)->rb_right);
> > + else
> > + return -EEXIST;
> > + }
> > +
> > + rb_link_node(®ion->node, parent, new);
> > + rb_insert_color(®ion->node, &afu->dma_regions);
> > +
> > + return 0;
> > +}
> > +
> > +/* Need to be called with pdata->lock held */
>
> Ditto
> > +static void afu_dma_region_remove(struct feature_platform_data *pdata,
> > + struct fpga_afu_dma_region *region)
> > +{
> > + struct fpga_afu *afu;
> > +
> > + dev_dbg(&pdata->dev->dev, "del region (iova = %llx)\n",
> > + (unsigned long long)region->iova);
> > +
> > + afu = fpga_pdata_get_private(pdata);
> > + rb_erase(®ion->node, &afu->dma_regions);
> > +}
> > +
> > +/* Need to be called with pdata->lock held */
>
> Ditto.
> > +void afu_dma_region_destroy(struct feature_platform_data *pdata)
> > +{
> > + struct fpga_afu *afu = fpga_pdata_get_private(pdata);
> > + struct rb_node *node = rb_first(&afu->dma_regions);
> > + struct fpga_afu_dma_region *region;
> > +
> > + while (node) {
> > + region = container_of(node, struct fpga_afu_dma_region, node);
> > +
> > + dev_dbg(&pdata->dev->dev, "del region (iova = %llx)\n",
> > + (unsigned long long)region->iova);
> > +
> > + rb_erase(node, &afu->dma_regions);
> > +
> > + if (region->iova)
> > + dma_unmap_page(fpga_pdata_to_pcidev(pdata),
> > + region->iova, region->length,
> > + DMA_BIDIRECTIONAL);
> > +
> > + if (region->pages)
> > + afu_dma_unpin_pages(pdata, region);
> > +
> > + node = rb_next(node);
> > + kfree(region);
> > + }
> > +}
> > +
> > +/*
> > + * It finds the dma region from the rbtree based on @iova and @size:
> > + * - if @size == 0, it finds the dma region which starts from @iova
> > + * - otherwise, it finds the dma region which fully contains
> > + * [@iova, @iova+size)
> > + * If nothing is matched returns NULL.
> > + *
> > + * Need to be called with pdata->lock held.
> > + */
> > +struct fpga_afu_dma_region *
> > +afu_dma_region_find(struct feature_platform_data *pdata, u64 iova, u64 size)
> > +{
> > + struct fpga_afu *afu = fpga_pdata_get_private(pdata);
> > + struct rb_node *node = afu->dma_regions.rb_node;
> > + struct device *dev = &pdata->dev->dev;
> > +
> > + while (node) {
> > + struct fpga_afu_dma_region *region;
> > +
> > + region = container_of(node, struct fpga_afu_dma_region, node);
> > +
> > + if (dma_region_check_iova(region, iova, size)) {
> > + dev_dbg(dev, "find region (iova = %llx)\n",
> > + (unsigned long long)region->iova);
> > + return region;
> > + }
> > +
> > + if (iova < region->iova)
> > + node = node->rb_left;
> > + else if (iova > region->iova)
> > + node = node->rb_right;
> > + else
> > + /* the iova region is not fully covered. */
> > + break;
> > + }
> > +
> > + dev_dbg(dev, "region with iova %llx and size %llx is not found\n",
> > + (unsigned long long)iova, (unsigned long long)size);
> > + return NULL;
> > +}
> > +
> > +static struct fpga_afu_dma_region *
> > +afu_dma_region_find_iova(struct feature_platform_data *pdata, u64 iova)
> > +{
> > + return afu_dma_region_find(pdata, iova, 0);
> > +}
> > +
> > +long afu_dma_map_region(struct feature_platform_data *pdata,
> > + u64 user_addr, u64 length, u64 *iova)
> > +{
> > + struct fpga_afu_dma_region *region;
> > + int ret;
> > +
> > + /*
> > + * Check Inputs, only accept page-aligned user memory region with
> > + * valid length.
> > + */
> > + if (!PAGE_ALIGNED(user_addr) || !PAGE_ALIGNED(length) || !length)
> > + return -EINVAL;
> > +
> > + /* Check overflow */
> > + if (user_addr + length < user_addr)
> > + return -EINVAL;
> > +
> > + if (!access_ok(VERIFY_WRITE, (void __user *)(unsigned long)user_addr,
> > + length))
> > + return -EINVAL;
> > +
> > + region = kzalloc(sizeof(*region), GFP_KERNEL);
> > + if (!region)
> > + return -ENOMEM;
> > +
> > + region->user_addr = user_addr;
> > + region->length = length;
> > +
> > + /* Pin the user memory region */
> > + ret = afu_dma_pin_pages(pdata, region);
> > + if (ret) {
> > + dev_err(&pdata->dev->dev, "fail to pin memory region\n");
> > + goto free_region;
> > + }
> > +
> > + /* Only accept continuous pages, return error if no */
> return error else
>
> > + if (!afu_dma_check_continuous_pages(region)) {
> > + dev_err(&pdata->dev->dev, "pages are not continuous\n");
> > + ret = -EINVAL;
> > + goto unpin_pages;
> > + }
> > +
> > + /* As pages are continuous then start to do DMA mapping */
> > + region->iova = dma_map_page(fpga_pdata_to_pcidev(pdata),
> > + region->pages[0], 0,
> > + region->length,
> > + DMA_BIDIRECTIONAL);
> > + if (dma_mapping_error(&pdata->dev->dev, region->iova)) {
> > + dev_err(&pdata->dev->dev, "fail to map dma mapping\n");
> 'failed to map for dma' ? :)
>
> > + ret = -EFAULT;
> > + goto unpin_pages;
> > + }
> > +
> > + *iova = region->iova;
> > +
> > + mutex_lock(&pdata->lock);
> > + ret = afu_dma_region_add(pdata, region);
> > + mutex_unlock(&pdata->lock);
> > + if (ret) {
> > + dev_err(&pdata->dev->dev, "fail to add dma region\n");
> > + goto unmap_dma;
> > + }
> > +
> > + return 0;
> > +
> > +unmap_dma:
> > + dma_unmap_page(fpga_pdata_to_pcidev(pdata),
> > + region->iova, region->length, DMA_BIDIRECTIONAL);
> > +unpin_pages:
> > + afu_dma_unpin_pages(pdata, region);
> > +free_region:
> > + kfree(region);
> > + return ret;
> > +}
> > +
> > +long afu_dma_unmap_region(struct feature_platform_data *pdata, u64 iova)
> > +{
> > + struct fpga_afu_dma_region *region;
> > +
> > + mutex_lock(&pdata->lock);
> > + region = afu_dma_region_find_iova(pdata, iova);
> > + if (!region) {
> > + mutex_unlock(&pdata->lock);
> > + return -EINVAL;
> > + }
> > +
> > + if (region->in_use) {
> > + mutex_unlock(&pdata->lock);
> > + return -EBUSY;
> > + }
> > +
> > + afu_dma_region_remove(pdata, region);
> > + mutex_unlock(&pdata->lock);
> > +
> > + dma_unmap_page(fpga_pdata_to_pcidev(pdata),
> > + region->iova, region->length, DMA_BIDIRECTIONAL);
> > + afu_dma_unpin_pages(pdata, region);
> > + kfree(region);
> > +
> > + return 0;
> > +}
> > diff --git a/drivers/fpga/intel-afu-main.c b/drivers/fpga/intel-afu-main.c
> > index 8c7aa70..d9f1ebf 100644
> > --- a/drivers/fpga/intel-afu-main.c
> > +++ b/drivers/fpga/intel-afu-main.c
> > @@ -175,7 +175,11 @@ static int afu_release(struct inode *inode, struct file *filp)
> >
> > dev_dbg(&pdev->dev, "Device File Release\n");
> >
> > - fpga_port_reset(pdev);
> > + mutex_lock(&pdata->lock);
> > + __fpga_port_reset(pdev);
> > + afu_dma_region_destroy(pdata);
> > + mutex_unlock(&pdata->lock);
> > +
> > feature_dev_use_end(pdata);
> > return 0;
> > }
> > @@ -245,6 +249,55 @@ static long afu_ioctl_check_extension(struct feature_platform_data *pdata,
> > return 0;
> > }
> >
> > +static long
> > +afu_ioctl_dma_map(struct feature_platform_data *pdata, void __user *arg)
> > +{
> > + struct fpga_port_dma_map map;
> > + unsigned long minsz;
> > + long ret;
> > +
> > + minsz = offsetofend(struct fpga_port_dma_map, iova);
> > +
> > + if (copy_from_user(&map, arg, minsz))
> > + return -EFAULT;
> > +
> > + if (map.argsz < minsz || map.flags)
> > + return -EINVAL;
> > +
> > + ret = afu_dma_map_region(pdata, map.user_addr, map.length, &map.iova);
> > + if (ret)
> > + return ret;
> > +
> > + if (copy_to_user(arg, &map, sizeof(map))) {
> > + afu_dma_unmap_region(pdata, map.iova);
> > + return -EFAULT;
> > + }
> > +
> > + dev_dbg(&pdata->dev->dev, "dma map: ua=%llx, len=%llx, iova=%llx\n",
> > + (unsigned long long)map.user_addr,
> > + (unsigned long long)map.length,
> > + (unsigned long long)map.iova);
> > +
> > + return 0;
> > +}
> > +
> > +static long
> > +afu_ioctl_dma_unmap(struct feature_platform_data *pdata, void __user *arg)
> > +{
> > + struct fpga_port_dma_unmap unmap;
> > + unsigned long minsz;
> > +
> > + minsz = offsetofend(struct fpga_port_dma_unmap, iova);
> > +
> > + if (copy_from_user(&unmap, arg, minsz))
> > + return -EFAULT;
> > +
> > + if (unmap.argsz < minsz || unmap.flags)
> > + return -EINVAL;
> > +
> > + return afu_dma_unmap_region(pdata, unmap.iova);
> > +}
> > +
> > static long afu_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> > {
> > struct platform_device *pdev = filp->private_data;
> > @@ -263,6 +316,10 @@ static long afu_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> > return afu_ioctl_get_info(pdata, (void __user *)arg);
> > case FPGA_PORT_GET_REGION_INFO:
> > return afu_ioctl_get_region_info(pdata, (void __user *)arg);
> > + case FPGA_PORT_DMA_MAP:
> > + return afu_ioctl_dma_map(pdata, (void __user *)arg);
> > + case FPGA_PORT_DMA_UNMAP:
> > + return afu_ioctl_dma_unmap(pdata, (void __user *)arg);
> > default:
> > /*
> > * Let sub-feature's ioctl function to handle the cmd
> > @@ -337,6 +394,7 @@ static int afu_dev_init(struct platform_device *pdev)
> > mutex_lock(&pdata->lock);
> > fpga_pdata_set_private(pdata, afu);
> > afu_region_init(pdata);
> > + afu_dma_region_init(pdata);
> > mutex_unlock(&pdata->lock);
> > return 0;
> > }
> > @@ -349,6 +407,7 @@ static int afu_dev_destroy(struct platform_device *pdev)
> > mutex_lock(&pdata->lock);
> > afu = fpga_pdata_get_private(pdata);
> > afu_region_destroy(pdata);
> > + afu_dma_region_destroy(pdata);
> > fpga_pdata_set_private(pdata, NULL);
> > mutex_unlock(&pdata->lock);
> >
> > diff --git a/drivers/fpga/intel-afu.h b/drivers/fpga/intel-afu.h
> > index 3417780d..23f7e24 100644
> > --- a/drivers/fpga/intel-afu.h
> > +++ b/drivers/fpga/intel-afu.h
> > @@ -30,11 +30,21 @@ struct fpga_afu_region {
> > struct list_head node;
> > };
> >
> > +struct fpga_afu_dma_region {
> > + u64 user_addr;
> > + u64 length;
> > + u64 iova;
> > + struct page **pages;
> > + struct rb_node node;
> > + bool in_use;
> > +};
> > +
> > struct fpga_afu {
> > u64 region_cur_offset;
> > int num_regions;
> > u8 num_umsgs;
> > struct list_head regions;
> > + struct rb_root dma_regions;
> >
> > struct feature_platform_data *pdata;
> > };
> > @@ -49,4 +59,12 @@ int afu_get_region_by_offset(struct feature_platform_data *pdata,
> > u64 offset, u64 size,
> > struct fpga_afu_region *pregion);
> >
> > +void afu_dma_region_init(struct feature_platform_data *pdata);
> > +void afu_dma_region_destroy(struct feature_platform_data *pdata);
> > +long afu_dma_map_region(struct feature_platform_data *pdata,
> > + u64 user_addr, u64 length, u64 *iova);
> > +long afu_dma_unmap_region(struct feature_platform_data *pdata, u64 iova);
> > +struct fpga_afu_dma_region *afu_dma_region_find(
> > + struct feature_platform_data *pdata, u64 iova, u64 size);
> > +
> > #endif
> > diff --git a/include/uapi/linux/intel-fpga.h b/include/uapi/linux/intel-fpga.h
> > index a2ad332..b97ea02 100644
> > --- a/include/uapi/linux/intel-fpga.h
> > +++ b/include/uapi/linux/intel-fpga.h
> > @@ -111,6 +111,43 @@ struct fpga_port_region_info {
> >
> > #define FPGA_PORT_GET_REGION_INFO _IO(FPGA_MAGIC, PORT_BASE + 2)
> >
> > +/**
> > + * FPGA_PORT_DMA_MAP - _IOWR(FPGA_MAGIC, PORT_BASE + 3,
> > + * struct fpga_port_dma_map)
> > + *
> > + * Map the dma memory per user_addr and length which are provided by caller.
> > + * Driver fills the iova in provided struct afu_port_dma_map.
> > + * This interface only accepts page-size aligned user memory for dma mapping.
> > + * Return: 0 on success, -errno on failure.
> > + */
> > +struct fpga_port_dma_map {
> > + /* Input */
> > + __u32 argsz; /* Structure length */
> > + __u32 flags; /* Zero for now */
> > + __u64 user_addr; /* Process virtual address */
> > + __u64 length; /* Length of mapping (bytes)*/
> > + /* Output */
> > + __u64 iova; /* IO virtual address */
> > +};
> > +
> > +#define FPGA_PORT_DMA_MAP _IO(FPGA_MAGIC, PORT_BASE + 3)
> > +
> > +/**
> > + * FPGA_PORT_DMA_UNMAP - _IOW(FPGA_MAGIC, PORT_BASE + 4,
> > + * struct fpga_port_dma_unmap)
> > + *
> > + * Unmap the dma memory per iova provided by caller.
> > + * Return: 0 on success, -errno on failure.
> > + */
> > +struct fpga_port_dma_unmap {
> > + /* Input */
> > + __u32 argsz; /* Structure length */
> > + __u32 flags; /* Zero for now */
> > + __u64 iova; /* IO virtual address */
> > +};
> > +
> > +#define FPGA_PORT_DMA_UNMAP _IO(FPGA_MAGIC, PORT_BASE + 4)
> > +
> > /* IOCTLs for FME file descriptor */
> >
> > /**
> > --
> > 1.8.3.1
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-fpga" in
> > the body of a message to majordomo@...r.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
>
> Thanks,
>
> Moritz
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