This patch implemented the IB core disassociate_ucontext API. Signed-off-by: Wei Hu (Xavier) <xavier.huwei@xxxxxxxxxx> --- v2->v3: Addressed the comments from Jason. The related link: https://lkml.org/lkml/2018/5/22/967 v1->v2: no change. --- drivers/infiniband/hw/hns/hns_roce_device.h | 8 ++++ drivers/infiniband/hw/hns/hns_roce_main.c | 70 ++++++++++++++++++++++++++++- 2 files changed, 77 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h index da8512b..31221d5 100644 --- a/drivers/infiniband/hw/hns/hns_roce_device.h +++ b/drivers/infiniband/hw/hns/hns_roce_device.h @@ -217,11 +217,19 @@ struct hns_roce_uar { unsigned long logic_idx; }; +struct hns_roce_vma_data { + struct list_head list; + struct vm_area_struct *vma; + struct mutex *vma_list_mutex; +}; + struct hns_roce_ucontext { struct ib_ucontext ibucontext; struct hns_roce_uar uar; struct list_head page_list; struct mutex page_mutex; + struct list_head vma_list; + struct mutex vma_list_mutex; }; struct hns_roce_pd { diff --git a/drivers/infiniband/hw/hns/hns_roce_main.c b/drivers/infiniband/hw/hns/hns_roce_main.c index ac51372..42296f0 100644 --- a/drivers/infiniband/hw/hns/hns_roce_main.c +++ b/drivers/infiniband/hw/hns/hns_roce_main.c @@ -345,6 +345,8 @@ static struct ib_ucontext *hns_roce_alloc_ucontext(struct ib_device *ib_dev, if (ret) goto error_fail_uar_alloc; + INIT_LIST_HEAD(&context->vma_list); + mutex_init(&context->vma_list_mutex); if (hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_RECORD_DB) { INIT_LIST_HEAD(&context->page_list); mutex_init(&context->page_mutex); @@ -375,6 +377,50 @@ static int hns_roce_dealloc_ucontext(struct ib_ucontext *ibcontext) return 0; } +static void hns_roce_vma_open(struct vm_area_struct *vma) +{ + vma->vm_ops = NULL; +} + +static void hns_roce_vma_close(struct vm_area_struct *vma) +{ + struct hns_roce_vma_data *vma_data; + + vma_data = (struct hns_roce_vma_data *)vma->vm_private_data; + vma_data->vma = NULL; + mutex_lock(vma_data->vma_list_mutex); + list_del(&vma_data->list); + mutex_unlock(vma_data->vma_list_mutex); + kfree(vma_data); +} + +static const struct vm_operations_struct hns_roce_vm_ops = { + .open = hns_roce_vma_open, + .close = hns_roce_vma_close, +}; + +static int hns_roce_set_vma_data(struct vm_area_struct *vma, + struct hns_roce_ucontext *context) +{ + struct list_head *vma_head = &context->vma_list; + struct hns_roce_vma_data *vma_data; + + vma_data = kzalloc(sizeof(*vma_data), GFP_KERNEL); + if (!vma_data) + return -ENOMEM; + + vma_data->vma = vma; + vma_data->vma_list_mutex = &context->vma_list_mutex; + vma->vm_private_data = vma_data; + vma->vm_ops = &hns_roce_vm_ops; + + mutex_lock(&context->vma_list_mutex); + list_add(&vma_data->list, vma_head); + mutex_unlock(&context->vma_list_mutex); + + return 0; +} + static int hns_roce_mmap(struct ib_ucontext *context, struct vm_area_struct *vma) { @@ -400,7 +446,7 @@ static int hns_roce_mmap(struct ib_ucontext *context, } else return -EINVAL; - return 0; + return hns_roce_set_vma_data(vma, to_hr_ucontext(context)); } static int hns_roce_port_immutable(struct ib_device *ib_dev, u8 port_num, @@ -424,6 +470,27 @@ static int hns_roce_port_immutable(struct ib_device *ib_dev, u8 port_num, return 0; } +static void hns_roce_disassociate_ucontext(struct ib_ucontext *ibcontext) +{ + struct hns_roce_ucontext *context = to_hr_ucontext(ibcontext); + struct hns_roce_vma_data *vma_data, *n; + struct vm_area_struct *vma; + int ret; + + mutex_lock(&context->vma_list_mutex); + list_for_each_entry_safe(vma_data, n, &context->vma_list, list) { + vma = vma_data->vma; + ret = zap_vma_ptes(vma, vma->vm_start, PAGE_SIZE); + WARN_ONCE(ret, "%s: zap_vma_ptes failed", __func__); + + vma->vm_flags &= ~(VM_SHARED | VM_MAYSHARE); + vma->vm_ops = NULL; + list_del(&vma_data->list); + kfree(vma_data); + } + mutex_unlock(&context->vma_list_mutex); +} + static void hns_roce_unregister_device(struct hns_roce_dev *hr_dev) { struct hns_roce_ib_iboe *iboe = &hr_dev->iboe; @@ -519,6 +586,7 @@ static int hns_roce_register_device(struct hns_roce_dev *hr_dev) /* OTHERS */ ib_dev->get_port_immutable = hns_roce_port_immutable; + ib_dev->disassociate_ucontext = hns_roce_disassociate_ucontext; ib_dev->driver_id = RDMA_DRIVER_HNS; ret = ib_register_device(ib_dev, NULL); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
