/* * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * 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. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include #include #include "mlx5_ib.h" #define MAX_PREFETCH_LEN (4*1024*1024U) /* Timeout in ms to wait for an active mmu notifier to complete when handling * a pagefault. */ #define MMU_NOTIFIER_TIMEOUT 1000 void mlx5_ib_invalidate_range(struct ib_umem *umem, unsigned long start, unsigned long end) { struct mlx5_ib_mr *mr; const u64 umr_block_mask = (MLX5_UMR_MTT_ALIGNMENT / sizeof(struct mlx5_mtt)) - 1; u64 idx = 0, blk_start_idx = 0; int in_block = 0; u64 addr; if (!umem || !umem->odp_data) { pr_err("invalidation called on NULL umem or non-ODP umem\n"); return; } mr = umem->odp_data->private; if (!mr || !mr->ibmr.pd) return; start = max_t(u64, ib_umem_start(umem), start); end = min_t(u64, ib_umem_end(umem), end); /* * Iteration one - zap the HW's MTTs. The notifiers_count ensures that * while we are doing the invalidation, no page fault will attempt to * overwrite the same MTTs. Concurent invalidations might race us, * but they will write 0s as well, so no difference in the end result. */ for (addr = start; addr < end; addr += (u64)umem->page_size) { idx = (addr - ib_umem_start(umem)) / PAGE_SIZE; /* * Strive to write the MTTs in chunks, but avoid overwriting * non-existing MTTs. The huristic here can be improved to * estimate the cost of another UMR vs. the cost of bigger * UMR. */ if (umem->odp_data->dma_list[idx] & (ODP_READ_ALLOWED_BIT | ODP_WRITE_ALLOWED_BIT)) { if (!in_block) { blk_start_idx = idx; in_block = 1; } } else { u64 umr_offset = idx & umr_block_mask; if (in_block && umr_offset == 0) { mlx5_ib_update_xlt(mr, blk_start_idx, idx - blk_start_idx, PAGE_SHIFT, MLX5_IB_UPD_XLT_ZAP | MLX5_IB_UPD_XLT_ATOMIC); in_block = 0; } } } if (in_block) mlx5_ib_update_xlt(mr, blk_start_idx, idx - blk_start_idx + 1, PAGE_SHIFT, MLX5_IB_UPD_XLT_ZAP | MLX5_IB_UPD_XLT_ATOMIC); /* * We are now sure that the device will not access the * memory. We can safely unmap it, and mark it as dirty if * needed. */ ib_umem_odp_unmap_dma_pages(umem, start, end); } void mlx5_ib_internal_fill_odp_caps(struct mlx5_ib_dev *dev) { struct ib_odp_caps *caps = &dev->odp_caps; memset(caps, 0, sizeof(*caps)); if (!MLX5_CAP_GEN(dev->mdev, pg)) return; caps->general_caps = IB_ODP_SUPPORT; if (MLX5_CAP_GEN(dev->mdev, umr_extended_translation_offset)) dev->odp_max_size = U64_MAX; else dev->odp_max_size = BIT_ULL(MLX5_MAX_UMR_SHIFT + PAGE_SHIFT); if (MLX5_CAP_ODP(dev->mdev, ud_odp_caps.send)) caps->per_transport_caps.ud_odp_caps |= IB_ODP_SUPPORT_SEND; if (MLX5_CAP_ODP(dev->mdev, rc_odp_caps.send)) caps->per_transport_caps.rc_odp_caps |= IB_ODP_SUPPORT_SEND; if (MLX5_CAP_ODP(dev->mdev, rc_odp_caps.receive)) caps->per_transport_caps.rc_odp_caps |= IB_ODP_SUPPORT_RECV; if (MLX5_CAP_ODP(dev->mdev, rc_odp_caps.write)) caps->per_transport_caps.rc_odp_caps |= IB_ODP_SUPPORT_WRITE; if (MLX5_CAP_ODP(dev->mdev, rc_odp_caps.read)) caps->per_transport_caps.rc_odp_caps |= IB_ODP_SUPPORT_READ; if (MLX5_CAP_ODP(dev->mdev, rc_odp_caps.atomic)) caps->per_transport_caps.rc_odp_caps |= IB_ODP_SUPPORT_ATOMIC; return; } static struct mlx5_ib_mr *mlx5_ib_odp_find_mr_lkey(struct mlx5_ib_dev *dev, u32 key) { u32 base_key = mlx5_base_mkey(key); struct mlx5_core_mkey *mmkey = __mlx5_mr_lookup(dev->mdev, base_key); struct mlx5_ib_mr *mr = container_of(mmkey, struct mlx5_ib_mr, mmkey); if (!mmkey || mmkey->key != key || !mr->live) return NULL; return container_of(mmkey, struct mlx5_ib_mr, mmkey); } static void mlx5_ib_page_fault_resume(struct mlx5_ib_dev *dev, struct mlx5_pagefault *pfault, int error) { int wq_num = pfault->event_subtype == MLX5_PFAULT_SUBTYPE_WQE ? pfault->wqe.wq_num : pfault->token; int ret = mlx5_core_page_fault_resume(dev->mdev, pfault->token, wq_num, pfault->type, error); if (ret) mlx5_ib_err(dev, "Failed to resolve the page fault on WQ 0x%x\n", wq_num); } /* * Handle a single data segment in a page-fault WQE or RDMA region. * * Returns number of pages retrieved on success. The caller may continue to * the next data segment. * Can return the following error codes: * -EAGAIN to designate a temporary error. The caller will abort handling the * page fault and resolve it. * -EFAULT when there's an error mapping the requested pages. The caller will * abort the page fault handling. */ static int pagefault_single_data_segment(struct mlx5_ib_dev *mib_dev, u32 key, u64 io_virt, size_t bcnt, u32 *bytes_committed, u32 *bytes_mapped) { int srcu_key; unsigned int current_seq; u64 start_idx; int npages = 0, ret = 0; struct mlx5_ib_mr *mr; u64 access_mask = ODP_READ_ALLOWED_BIT; srcu_key = srcu_read_lock(&mib_dev->mr_srcu); mr = mlx5_ib_odp_find_mr_lkey(mib_dev, key); /* * If we didn't find the MR, it means the MR was closed while we were * handling the ODP event. In this case we return -EFAULT so that the * QP will be closed. */ if (!mr || !mr->ibmr.pd) { pr_err("Failed to find relevant mr for lkey=0x%06x, probably the MR was destroyed\n", key); ret = -EFAULT; goto srcu_unlock; } if (!mr->umem->odp_data) { pr_debug("skipping non ODP MR (lkey=0x%06x) in page fault handler.\n", key); if (bytes_mapped) *bytes_mapped += (bcnt - *bytes_committed); goto srcu_unlock; } current_seq = ACCESS_ONCE(mr->umem->odp_data->notifiers_seq); /* * Ensure the sequence number is valid for some time before we call * gup. */ smp_rmb(); /* * Avoid branches - this code will perform correctly * in all iterations (in iteration 2 and above, * bytes_committed == 0). */ io_virt += *bytes_committed; bcnt -= *bytes_committed; start_idx = (io_virt - (mr->mmkey.iova & PAGE_MASK)) >> PAGE_SHIFT; if (mr->umem->writable) access_mask |= ODP_WRITE_ALLOWED_BIT; npages = ib_umem_odp_map_dma_pages(mr->umem, io_virt, bcnt, access_mask, current_seq); if (npages < 0) { ret = npages; goto srcu_unlock; } if (npages > 0) { mutex_lock(&mr->umem->odp_data->umem_mutex); if (!ib_umem_mmu_notifier_retry(mr->umem, current_seq)) { /* * No need to check whether the MTTs really belong to * this MR, since ib_umem_odp_map_dma_pages already * checks this. */ ret = mlx5_ib_update_xlt(mr, start_idx, npages, PAGE_SHIFT, MLX5_IB_UPD_XLT_ATOMIC); } else { ret = -EAGAIN; } mutex_unlock(&mr->umem->odp_data->umem_mutex); if (ret < 0) { if (ret != -EAGAIN) pr_err("Failed to update mkey page tables\n"); goto srcu_unlock; } if (bytes_mapped) { u32 new_mappings = npages * PAGE_SIZE - (io_virt - round_down(io_virt, PAGE_SIZE)); *bytes_mapped += min_t(u32, new_mappings, bcnt); } } srcu_unlock: if (ret == -EAGAIN) { if (!mr->umem->odp_data->dying) { struct ib_umem_odp *odp_data = mr->umem->odp_data; unsigned long timeout = msecs_to_jiffies(MMU_NOTIFIER_TIMEOUT); if (!wait_for_completion_timeout( &odp_data->notifier_completion, timeout)) { pr_warn("timeout waiting for mmu notifier completion\n"); } } else { /* The MR is being killed, kill the QP as well. */ ret = -EFAULT; } } srcu_read_unlock(&mib_dev->mr_srcu, srcu_key); *bytes_committed = 0; return ret ? ret : npages; } /** * Parse a series of data segments for page fault handling. * * @qp the QP on which the fault occurred. * @pfault contains page fault information. * @wqe points at the first data segment in the WQE. * @wqe_end points after the end of the WQE. * @bytes_mapped receives the number of bytes that the function was able to * map. This allows the caller to decide intelligently whether * enough memory was mapped to resolve the page fault * successfully (e.g. enough for the next MTU, or the entire * WQE). * @total_wqe_bytes receives the total data size of this WQE in bytes (minus * the committed bytes). * * Returns the number of pages loaded if positive, zero for an empty WQE, or a * negative error code. */ static int pagefault_data_segments(struct mlx5_ib_dev *dev, struct mlx5_pagefault *pfault, struct mlx5_ib_qp *qp, void *wqe, void *wqe_end, u32 *bytes_mapped, u32 *total_wqe_bytes, int receive_queue) { int ret = 0, npages = 0; u64 io_virt; u32 key; u32 byte_count; size_t bcnt; int inline_segment; /* Skip SRQ next-WQE segment. */ if (receive_queue && qp->ibqp.srq) wqe += sizeof(struct mlx5_wqe_srq_next_seg); if (bytes_mapped) *bytes_mapped = 0; if (total_wqe_bytes) *total_wqe_bytes = 0; while (wqe < wqe_end) { struct mlx5_wqe_data_seg *dseg = wqe; io_virt = be64_to_cpu(dseg->addr); key = be32_to_cpu(dseg->lkey); byte_count = be32_to_cpu(dseg->byte_count); inline_segment = !!(byte_count & MLX5_INLINE_SEG); bcnt = byte_count & ~MLX5_INLINE_SEG; if (inline_segment) { bcnt = bcnt & MLX5_WQE_INLINE_SEG_BYTE_COUNT_MASK; wqe += ALIGN(sizeof(struct mlx5_wqe_inline_seg) + bcnt, 16); } else { wqe += sizeof(*dseg); } /* receive WQE end of sg list. */ if (receive_queue && bcnt == 0 && key == MLX5_INVALID_LKEY && io_virt == 0) break; if (!inline_segment && total_wqe_bytes) { *total_wqe_bytes += bcnt - min_t(size_t, bcnt, pfault->bytes_committed); } /* A zero length data segment designates a length of 2GB. */ if (bcnt == 0) bcnt = 1U << 31; if (inline_segment || bcnt <= pfault->bytes_committed) { pfault->bytes_committed -= min_t(size_t, bcnt, pfault->bytes_committed); continue; } ret = pagefault_single_data_segment(dev, key, io_virt, bcnt, &pfault->bytes_committed, bytes_mapped); if (ret < 0) break; npages += ret; } return ret < 0 ? ret : npages; } static const u32 mlx5_ib_odp_opcode_cap[] = { [MLX5_OPCODE_SEND] = IB_ODP_SUPPORT_SEND, [MLX5_OPCODE_SEND_IMM] = IB_ODP_SUPPORT_SEND, [MLX5_OPCODE_SEND_INVAL] = IB_ODP_SUPPORT_SEND, [MLX5_OPCODE_RDMA_WRITE] = IB_ODP_SUPPORT_WRITE, [MLX5_OPCODE_RDMA_WRITE_IMM] = IB_ODP_SUPPORT_WRITE, [MLX5_OPCODE_RDMA_READ] = IB_ODP_SUPPORT_READ, [MLX5_OPCODE_ATOMIC_CS] = IB_ODP_SUPPORT_ATOMIC, [MLX5_OPCODE_ATOMIC_FA] = IB_ODP_SUPPORT_ATOMIC, }; /* * Parse initiator WQE. Advances the wqe pointer to point at the * scatter-gather list, and set wqe_end to the end of the WQE. */ static int mlx5_ib_mr_initiator_pfault_handler( struct mlx5_ib_dev *dev, struct mlx5_pagefault *pfault, struct mlx5_ib_qp *qp, void **wqe, void **wqe_end, int wqe_length) { struct mlx5_wqe_ctrl_seg *ctrl = *wqe; u16 wqe_index = pfault->wqe.wqe_index; u32 transport_caps; struct mlx5_base_av *av; unsigned ds, opcode; #if defined(DEBUG) u32 ctrl_wqe_index, ctrl_qpn; #endif u32 qpn = qp->trans_qp.base.mqp.qpn; ds = be32_to_cpu(ctrl->qpn_ds) & MLX5_WQE_CTRL_DS_MASK; if (ds * MLX5_WQE_DS_UNITS > wqe_length) { mlx5_ib_err(dev, "Unable to read the complete WQE. ds = 0x%x, ret = 0x%x\n", ds, wqe_length); return -EFAULT; } if (ds == 0) { mlx5_ib_err(dev, "Got WQE with zero DS. wqe_index=%x, qpn=%x\n", wqe_index, qpn); return -EFAULT; } #if defined(DEBUG) ctrl_wqe_index = (be32_to_cpu(ctrl->opmod_idx_opcode) & MLX5_WQE_CTRL_WQE_INDEX_MASK) >> MLX5_WQE_CTRL_WQE_INDEX_SHIFT; if (wqe_index != ctrl_wqe_index) { mlx5_ib_err(dev, "Got WQE with invalid wqe_index. wqe_index=0x%x, qpn=0x%x ctrl->wqe_index=0x%x\n", wqe_index, qpn, ctrl_wqe_index); return -EFAULT; } ctrl_qpn = (be32_to_cpu(ctrl->qpn_ds) & MLX5_WQE_CTRL_QPN_MASK) >> MLX5_WQE_CTRL_QPN_SHIFT; if (qpn != ctrl_qpn) { mlx5_ib_err(dev, "Got WQE with incorrect QP number. wqe_index=0x%x, qpn=0x%x ctrl->qpn=0x%x\n", wqe_index, qpn, ctrl_qpn); return -EFAULT; } #endif /* DEBUG */ *wqe_end = *wqe + ds * MLX5_WQE_DS_UNITS; *wqe += sizeof(*ctrl); opcode = be32_to_cpu(ctrl->opmod_idx_opcode) & MLX5_WQE_CTRL_OPCODE_MASK; switch (qp->ibqp.qp_type) { case IB_QPT_RC: transport_caps = dev->odp_caps.per_transport_caps.rc_odp_caps; break; case IB_QPT_UD: transport_caps = dev->odp_caps.per_transport_caps.ud_odp_caps; break; default: mlx5_ib_err(dev, "ODP fault on QP of an unsupported transport 0x%x\n", qp->ibqp.qp_type); return -EFAULT; } if (unlikely(opcode >= sizeof(mlx5_ib_odp_opcode_cap) / sizeof(mlx5_ib_odp_opcode_cap[0]) || !(transport_caps & mlx5_ib_odp_opcode_cap[opcode]))) { mlx5_ib_err(dev, "ODP fault on QP of an unsupported opcode 0x%x\n", opcode); return -EFAULT; } if (qp->ibqp.qp_type != IB_QPT_RC) { av = *wqe; if (av->dqp_dct & be32_to_cpu(MLX5_WQE_AV_EXT)) *wqe += sizeof(struct mlx5_av); else *wqe += sizeof(struct mlx5_base_av); } switch (opcode) { case MLX5_OPCODE_RDMA_WRITE: case MLX5_OPCODE_RDMA_WRITE_IMM: case MLX5_OPCODE_RDMA_READ: *wqe += sizeof(struct mlx5_wqe_raddr_seg); break; case MLX5_OPCODE_ATOMIC_CS: case MLX5_OPCODE_ATOMIC_FA: *wqe += sizeof(struct mlx5_wqe_raddr_seg); *wqe += sizeof(struct mlx5_wqe_atomic_seg); break; } return 0; } /* * Parse responder WQE. Advances the wqe pointer to point at the * scatter-gather list, and set wqe_end to the end of the WQE. */ static int mlx5_ib_mr_responder_pfault_handler( struct mlx5_ib_dev *dev, struct mlx5_pagefault *pfault, struct mlx5_ib_qp *qp, void **wqe, void **wqe_end, int wqe_length) { struct mlx5_ib_wq *wq = &qp->rq; int wqe_size = 1 << wq->wqe_shift; if (qp->ibqp.srq) { mlx5_ib_err(dev, "ODP fault on SRQ is not supported\n"); return -EFAULT; } if (qp->wq_sig) { mlx5_ib_err(dev, "ODP fault with WQE signatures is not supported\n"); return -EFAULT; } if (wqe_size > wqe_length) { mlx5_ib_err(dev, "Couldn't read all of the receive WQE's content\n"); return -EFAULT; } switch (qp->ibqp.qp_type) { case IB_QPT_RC: if (!(dev->odp_caps.per_transport_caps.rc_odp_caps & IB_ODP_SUPPORT_RECV)) goto invalid_transport_or_opcode; break; default: invalid_transport_or_opcode: mlx5_ib_err(dev, "ODP fault on QP of an unsupported transport. transport: 0x%x\n", qp->ibqp.qp_type); return -EFAULT; } *wqe_end = *wqe + wqe_size; return 0; } static struct mlx5_ib_qp *mlx5_ib_odp_find_qp(struct mlx5_ib_dev *dev, u32 wq_num) { struct mlx5_core_qp *mqp = __mlx5_qp_lookup(dev->mdev, wq_num); if (!mqp) { mlx5_ib_err(dev, "QPN 0x%6x not found\n", wq_num); return NULL; } return to_mibqp(mqp); } static void mlx5_ib_mr_wqe_pfault_handler(struct mlx5_ib_dev *dev, struct mlx5_pagefault *pfault) { int ret; void *wqe, *wqe_end; u32 bytes_mapped, total_wqe_bytes; char *buffer = NULL; int resume_with_error = 1; u16 wqe_index = pfault->wqe.wqe_index; int requestor = pfault->type & MLX5_PFAULT_REQUESTOR; struct mlx5_ib_qp *qp; buffer = (char *)__get_free_page(GFP_KERNEL); if (!buffer) { mlx5_ib_err(dev, "Error allocating memory for IO page fault handling.\n"); goto resolve_page_fault; } qp = mlx5_ib_odp_find_qp(dev, pfault->wqe.wq_num); if (!qp) goto resolve_page_fault; ret = mlx5_ib_read_user_wqe(qp, requestor, wqe_index, buffer, PAGE_SIZE, &qp->trans_qp.base); if (ret < 0) { mlx5_ib_err(dev, "Failed reading a WQE following page fault, error=%d, wqe_index=%x, qpn=%x\n", ret, wqe_index, pfault->token); goto resolve_page_fault; } wqe = buffer; if (requestor) ret = mlx5_ib_mr_initiator_pfault_handler(dev, pfault, qp, &wqe, &wqe_end, ret); else ret = mlx5_ib_mr_responder_pfault_handler(dev, pfault, qp, &wqe, &wqe_end, ret); if (ret < 0) goto resolve_page_fault; if (wqe >= wqe_end) { mlx5_ib_err(dev, "ODP fault on invalid WQE.\n"); goto resolve_page_fault; } ret = pagefault_data_segments(dev, pfault, qp, wqe, wqe_end, &bytes_mapped, &total_wqe_bytes, !requestor); if (ret == -EAGAIN) { resume_with_error = 0; goto resolve_page_fault; } else if (ret < 0 || total_wqe_bytes > bytes_mapped) { if (ret != -ENOENT) mlx5_ib_err(dev, "Error getting user pages for page fault. Error: %d\n", ret); goto resolve_page_fault; } resume_with_error = 0; resolve_page_fault: mlx5_ib_page_fault_resume(dev, pfault, resume_with_error); mlx5_ib_dbg(dev, "PAGE FAULT completed. QP 0x%x resume_with_error=%d, type: 0x%x\n", pfault->token, resume_with_error, pfault->type); free_page((unsigned long)buffer); } static int pages_in_range(u64 address, u32 length) { return (ALIGN(address + length, PAGE_SIZE) - (address & PAGE_MASK)) >> PAGE_SHIFT; } static void mlx5_ib_mr_rdma_pfault_handler(struct mlx5_ib_dev *dev, struct mlx5_pagefault *pfault) { u64 address; u32 length; u32 prefetch_len = pfault->bytes_committed; int prefetch_activated = 0; u32 rkey = pfault->rdma.r_key; int ret; /* The RDMA responder handler handles the page fault in two parts. * First it brings the necessary pages for the current packet * (and uses the pfault context), and then (after resuming the QP) * prefetches more pages. The second operation cannot use the pfault * context and therefore uses the dummy_pfault context allocated on * the stack */ pfault->rdma.rdma_va += pfault->bytes_committed; pfault->rdma.rdma_op_len -= min(pfault->bytes_committed, pfault->rdma.rdma_op_len); pfault->bytes_committed = 0; address = pfault->rdma.rdma_va; length = pfault->rdma.rdma_op_len; /* For some operations, the hardware cannot tell the exact message * length, and in those cases it reports zero. Use prefetch * logic. */ if (length == 0) { prefetch_activated = 1; length = pfault->rdma.packet_size; prefetch_len = min(MAX_PREFETCH_LEN, prefetch_len); } ret = pagefault_single_data_segment(dev, rkey, address, length, &pfault->bytes_committed, NULL); if (ret == -EAGAIN) { /* We're racing with an invalidation, don't prefetch */ prefetch_activated = 0; } else if (ret < 0 || pages_in_range(address, length) > ret) { mlx5_ib_page_fault_resume(dev, pfault, 1); if (ret != -ENOENT) mlx5_ib_warn(dev, "PAGE FAULT error %d. QP 0x%x, type: 0x%x\n", ret, pfault->token, pfault->type); return; } mlx5_ib_page_fault_resume(dev, pfault, 0); mlx5_ib_dbg(dev, "PAGE FAULT completed. QP 0x%x, type: 0x%x, prefetch_activated: %d\n", pfault->token, pfault->type, prefetch_activated); /* At this point, there might be a new pagefault already arriving in * the eq, switch to the dummy pagefault for the rest of the * processing. We're still OK with the objects being alive as the * work-queue is being fenced. */ if (prefetch_activated) { u32 bytes_committed = 0; ret = pagefault_single_data_segment(dev, rkey, address, prefetch_len, &bytes_committed, NULL); if (ret < 0) { mlx5_ib_warn(dev, "Prefetch failed. ret: %d, QP 0x%x, address: 0x%.16llx, length = 0x%.16x\n", ret, pfault->token, address, prefetch_len); } } } void mlx5_ib_pfault(struct mlx5_core_dev *mdev, void *context, struct mlx5_pagefault *pfault) { struct mlx5_ib_dev *dev = context; u8 event_subtype = pfault->event_subtype; switch (event_subtype) { case MLX5_PFAULT_SUBTYPE_WQE: mlx5_ib_mr_wqe_pfault_handler(dev, pfault); break; case MLX5_PFAULT_SUBTYPE_RDMA: mlx5_ib_mr_rdma_pfault_handler(dev, pfault); break; default: mlx5_ib_err(dev, "Invalid page fault event subtype: 0x%x\n", event_subtype); mlx5_ib_page_fault_resume(dev, pfault, 1); } } int mlx5_ib_odp_init_one(struct mlx5_ib_dev *ibdev) { int ret; ret = init_srcu_struct(&ibdev->mr_srcu); if (ret) return ret; return 0; } void mlx5_ib_odp_remove_one(struct mlx5_ib_dev *ibdev) { cleanup_srcu_struct(&ibdev->mr_srcu); }