/* * Copyright(c) 2020 - Cornelis Networks, Inc. * Copyright(c) 2015 - 2018 Intel Corporation. * * This file is provided under a dual BSD/GPLv2 license. When using or * redistributing this file, you may do so under either license. * * GPL LICENSE SUMMARY * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * BSD LICENSE * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "hfi.h" #include "sdma.h" #include "user_sdma.h" #include "verbs.h" /* for the headers */ #include "common.h" /* for struct hfi1_tid_info */ #include "trace.h" static uint hfi1_sdma_comp_ring_size = 128; module_param_named(sdma_comp_size, hfi1_sdma_comp_ring_size, uint, S_IRUGO); MODULE_PARM_DESC(sdma_comp_size, "Size of User SDMA completion ring. Default: 128"); static unsigned initial_pkt_count = 8; static int user_sdma_send_pkts(struct user_sdma_request *req, u16 maxpkts); static void user_sdma_txreq_cb(struct sdma_txreq *txreq, int status); static inline void pq_update(struct hfi1_user_sdma_pkt_q *pq); static void user_sdma_free_request(struct user_sdma_request *req); static int check_header_template(struct user_sdma_request *req, struct hfi1_pkt_header *hdr, u32 lrhlen, u32 datalen); static int set_txreq_header(struct user_sdma_request *req, struct user_sdma_txreq *tx, u32 datalen); static int set_txreq_header_ahg(struct user_sdma_request *req, struct user_sdma_txreq *tx, u32 len); static inline void set_comp_state(struct hfi1_user_sdma_pkt_q *pq, struct hfi1_user_sdma_comp_q *cq, u16 idx, enum hfi1_sdma_comp_state state, int ret); static inline u32 set_pkt_bth_psn(__be32 bthpsn, u8 expct, u32 frags); static inline u32 get_lrh_len(struct hfi1_pkt_header, u32 len); static int defer_packet_queue( struct sdma_engine *sde, struct iowait_work *wait, struct sdma_txreq *txreq, uint seq, bool pkts_sent); static void activate_packet_queue(struct iowait *wait, int reason); static bool sdma_rb_filter(struct mmu_rb_node *node, unsigned long addr, unsigned long len); static int sdma_rb_evict(void *arg, struct mmu_rb_node *mnode, void *arg2, bool *stop); static void sdma_rb_remove(void *arg, struct mmu_rb_node *mnode); static struct mmu_rb_ops sdma_rb_ops = { .filter = sdma_rb_filter, .evict = sdma_rb_evict, .remove = sdma_rb_remove, }; static int add_system_pages_to_sdma_packet(struct user_sdma_request *req, struct user_sdma_txreq *tx, struct user_sdma_iovec *iovec, u32 *pkt_remaining); static int defer_packet_queue( struct sdma_engine *sde, struct iowait_work *wait, struct sdma_txreq *txreq, uint seq, bool pkts_sent) { struct hfi1_user_sdma_pkt_q *pq = container_of(wait->iow, struct hfi1_user_sdma_pkt_q, busy); write_seqlock(&sde->waitlock); trace_hfi1_usdma_defer(pq, sde, &pq->busy); if (sdma_progress(sde, seq, txreq)) goto eagain; /* * We are assuming that if the list is enqueued somewhere, it * is to the dmawait list since that is the only place where * it is supposed to be enqueued. */ xchg(&pq->state, SDMA_PKT_Q_DEFERRED); if (list_empty(&pq->busy.list)) { pq->busy.lock = &sde->waitlock; iowait_get_priority(&pq->busy); iowait_queue(pkts_sent, &pq->busy, &sde->dmawait); } write_sequnlock(&sde->waitlock); return -EBUSY; eagain: write_sequnlock(&sde->waitlock); return -EAGAIN; } static void activate_packet_queue(struct iowait *wait, int reason) { struct hfi1_user_sdma_pkt_q *pq = container_of(wait, struct hfi1_user_sdma_pkt_q, busy); trace_hfi1_usdma_activate(pq, wait, reason); xchg(&pq->state, SDMA_PKT_Q_ACTIVE); wake_up(&wait->wait_dma); }; int hfi1_user_sdma_alloc_queues(struct hfi1_ctxtdata *uctxt, struct hfi1_filedata *fd) { int ret = -ENOMEM; char buf[64]; struct hfi1_devdata *dd; struct hfi1_user_sdma_comp_q *cq; struct hfi1_user_sdma_pkt_q *pq; if (!uctxt || !fd) return -EBADF; if (!hfi1_sdma_comp_ring_size) return -EINVAL; dd = uctxt->dd; pq = kzalloc(sizeof(*pq), GFP_KERNEL); if (!pq) return -ENOMEM; pq->dd = dd; pq->ctxt = uctxt->ctxt; pq->subctxt = fd->subctxt; pq->n_max_reqs = hfi1_sdma_comp_ring_size; atomic_set(&pq->n_reqs, 0); init_waitqueue_head(&pq->wait); atomic_set(&pq->n_locked, 0); iowait_init(&pq->busy, 0, NULL, NULL, defer_packet_queue, activate_packet_queue, NULL, NULL); pq->reqidx = 0; pq->reqs = kcalloc(hfi1_sdma_comp_ring_size, sizeof(*pq->reqs), GFP_KERNEL); if (!pq->reqs) goto pq_reqs_nomem; pq->req_in_use = bitmap_zalloc(hfi1_sdma_comp_ring_size, GFP_KERNEL); if (!pq->req_in_use) goto pq_reqs_no_in_use; snprintf(buf, 64, "txreq-kmem-cache-%u-%u-%u", dd->unit, uctxt->ctxt, fd->subctxt); pq->txreq_cache = kmem_cache_create(buf, sizeof(struct user_sdma_txreq), L1_CACHE_BYTES, SLAB_HWCACHE_ALIGN, NULL); if (!pq->txreq_cache) { dd_dev_err(dd, "[%u] Failed to allocate TxReq cache\n", uctxt->ctxt); goto pq_txreq_nomem; } cq = kzalloc(sizeof(*cq), GFP_KERNEL); if (!cq) goto cq_nomem; cq->comps = vmalloc_user(PAGE_ALIGN(sizeof(*cq->comps) * hfi1_sdma_comp_ring_size)); if (!cq->comps) goto cq_comps_nomem; cq->nentries = hfi1_sdma_comp_ring_size; ret = hfi1_mmu_rb_register(pq, &sdma_rb_ops, dd->pport->hfi1_wq, &pq->handler); if (ret) { dd_dev_err(dd, "Failed to register with MMU %d", ret); goto pq_mmu_fail; } rcu_assign_pointer(fd->pq, pq); fd->cq = cq; return 0; pq_mmu_fail: vfree(cq->comps); cq_comps_nomem: kfree(cq); cq_nomem: kmem_cache_destroy(pq->txreq_cache); pq_txreq_nomem: bitmap_free(pq->req_in_use); pq_reqs_no_in_use: kfree(pq->reqs); pq_reqs_nomem: kfree(pq); return ret; } static void flush_pq_iowait(struct hfi1_user_sdma_pkt_q *pq) { unsigned long flags; seqlock_t *lock = pq->busy.lock; if (!lock) return; write_seqlock_irqsave(lock, flags); if (!list_empty(&pq->busy.list)) { list_del_init(&pq->busy.list); pq->busy.lock = NULL; } write_sequnlock_irqrestore(lock, flags); } int hfi1_user_sdma_free_queues(struct hfi1_filedata *fd, struct hfi1_ctxtdata *uctxt) { struct hfi1_user_sdma_pkt_q *pq; trace_hfi1_sdma_user_free_queues(uctxt->dd, uctxt->ctxt, fd->subctxt); spin_lock(&fd->pq_rcu_lock); pq = srcu_dereference_check(fd->pq, &fd->pq_srcu, lockdep_is_held(&fd->pq_rcu_lock)); if (pq) { rcu_assign_pointer(fd->pq, NULL); spin_unlock(&fd->pq_rcu_lock); synchronize_srcu(&fd->pq_srcu); /* at this point there can be no more new requests */ iowait_sdma_drain(&pq->busy); /* Wait until all requests have been freed. */ wait_event_interruptible( pq->wait, !atomic_read(&pq->n_reqs)); kfree(pq->reqs); if (pq->handler) hfi1_mmu_rb_unregister(pq->handler); bitmap_free(pq->req_in_use); kmem_cache_destroy(pq->txreq_cache); flush_pq_iowait(pq); kfree(pq); } else { spin_unlock(&fd->pq_rcu_lock); } if (fd->cq) { vfree(fd->cq->comps); kfree(fd->cq); fd->cq = NULL; } return 0; } static u8 dlid_to_selector(u16 dlid) { static u8 mapping[256]; static int initialized; static u8 next; int hash; if (!initialized) { memset(mapping, 0xFF, 256); initialized = 1; } hash = ((dlid >> 8) ^ dlid) & 0xFF; if (mapping[hash] == 0xFF) { mapping[hash] = next; next = (next + 1) & 0x7F; } return mapping[hash]; } /** * hfi1_user_sdma_process_request() - Process and start a user sdma request * @fd: valid file descriptor * @iovec: array of io vectors to process * @dim: overall iovec array size * @count: number of io vector array entries processed */ int hfi1_user_sdma_process_request(struct hfi1_filedata *fd, struct iovec *iovec, unsigned long dim, unsigned long *count) { int ret = 0, i; struct hfi1_ctxtdata *uctxt = fd->uctxt; struct hfi1_user_sdma_pkt_q *pq = srcu_dereference(fd->pq, &fd->pq_srcu); struct hfi1_user_sdma_comp_q *cq = fd->cq; struct hfi1_devdata *dd = pq->dd; unsigned long idx = 0; u8 pcount = initial_pkt_count; struct sdma_req_info info; struct user_sdma_request *req; u8 opcode, sc, vl; u16 pkey; u32 slid; u16 dlid; u32 selector; if (iovec[idx].iov_len < sizeof(info) + sizeof(req->hdr)) { hfi1_cdbg( SDMA, "[%u:%u:%u] First vector not big enough for header %lu/%lu", dd->unit, uctxt->ctxt, fd->subctxt, iovec[idx].iov_len, sizeof(info) + sizeof(req->hdr)); return -EINVAL; } ret = copy_from_user(&info, iovec[idx].iov_base, sizeof(info)); if (ret) { hfi1_cdbg(SDMA, "[%u:%u:%u] Failed to copy info QW (%d)", dd->unit, uctxt->ctxt, fd->subctxt, ret); return -EFAULT; } trace_hfi1_sdma_user_reqinfo(dd, uctxt->ctxt, fd->subctxt, (u16 *)&info); if (info.comp_idx >= hfi1_sdma_comp_ring_size) { hfi1_cdbg(SDMA, "[%u:%u:%u:%u] Invalid comp index", dd->unit, uctxt->ctxt, fd->subctxt, info.comp_idx); return -EINVAL; } /* * Sanity check the header io vector count. Need at least 1 vector * (header) and cannot be larger than the actual io vector count. */ if (req_iovcnt(info.ctrl) < 1 || req_iovcnt(info.ctrl) > dim) { hfi1_cdbg(SDMA, "[%u:%u:%u:%u] Invalid iov count %d, dim %ld", dd->unit, uctxt->ctxt, fd->subctxt, info.comp_idx, req_iovcnt(info.ctrl), dim); return -EINVAL; } if (!info.fragsize) { hfi1_cdbg(SDMA, "[%u:%u:%u:%u] Request does not specify fragsize", dd->unit, uctxt->ctxt, fd->subctxt, info.comp_idx); return -EINVAL; } /* Try to claim the request. */ if (test_and_set_bit(info.comp_idx, pq->req_in_use)) { hfi1_cdbg(SDMA, "[%u:%u:%u] Entry %u is in use", dd->unit, uctxt->ctxt, fd->subctxt, info.comp_idx); return -EBADSLT; } /* * All safety checks have been done and this request has been claimed. */ trace_hfi1_sdma_user_process_request(dd, uctxt->ctxt, fd->subctxt, info.comp_idx); req = pq->reqs + info.comp_idx; req->data_iovs = req_iovcnt(info.ctrl) - 1; /* subtract header vector */ req->data_len = 0; req->pq = pq; req->cq = cq; req->ahg_idx = -1; req->iov_idx = 0; req->sent = 0; req->seqnum = 0; req->seqcomp = 0; req->seqsubmitted = 0; req->tids = NULL; req->has_error = 0; INIT_LIST_HEAD(&req->txps); memcpy(&req->info, &info, sizeof(info)); /* The request is initialized, count it */ atomic_inc(&pq->n_reqs); if (req_opcode(info.ctrl) == EXPECTED) { /* expected must have a TID info and at least one data vector */ if (req->data_iovs < 2) { SDMA_DBG(req, "Not enough vectors for expected request"); ret = -EINVAL; goto free_req; } req->data_iovs--; } if (!info.npkts || req->data_iovs > MAX_VECTORS_PER_REQ) { SDMA_DBG(req, "Too many vectors (%u/%u)", req->data_iovs, MAX_VECTORS_PER_REQ); ret = -EINVAL; goto free_req; } /* Copy the header from the user buffer */ ret = copy_from_user(&req->hdr, iovec[idx].iov_base + sizeof(info), sizeof(req->hdr)); if (ret) { SDMA_DBG(req, "Failed to copy header template (%d)", ret); ret = -EFAULT; goto free_req; } /* If Static rate control is not enabled, sanitize the header. */ if (!HFI1_CAP_IS_USET(STATIC_RATE_CTRL)) req->hdr.pbc[2] = 0; /* Validate the opcode. Do not trust packets from user space blindly. */ opcode = (be32_to_cpu(req->hdr.bth[0]) >> 24) & 0xff; if ((opcode & USER_OPCODE_CHECK_MASK) != USER_OPCODE_CHECK_VAL) { SDMA_DBG(req, "Invalid opcode (%d)", opcode); ret = -EINVAL; goto free_req; } /* * Validate the vl. Do not trust packets from user space blindly. * VL comes from PBC, SC comes from LRH, and the VL needs to * match the SC look up. */ vl = (le16_to_cpu(req->hdr.pbc[0]) >> 12) & 0xF; sc = (((be16_to_cpu(req->hdr.lrh[0]) >> 12) & 0xF) | (((le16_to_cpu(req->hdr.pbc[1]) >> 14) & 0x1) << 4)); if (vl >= dd->pport->vls_operational || vl != sc_to_vlt(dd, sc)) { SDMA_DBG(req, "Invalid SC(%u)/VL(%u)", sc, vl); ret = -EINVAL; goto free_req; } /* Checking P_KEY for requests from user-space */ pkey = (u16)be32_to_cpu(req->hdr.bth[0]); slid = be16_to_cpu(req->hdr.lrh[3]); if (egress_pkey_check(dd->pport, slid, pkey, sc, PKEY_CHECK_INVALID)) { ret = -EINVAL; goto free_req; } /* * Also should check the BTH.lnh. If it says the next header is GRH then * the RXE parsing will be off and will land in the middle of the KDETH * or miss it entirely. */ if ((be16_to_cpu(req->hdr.lrh[0]) & 0x3) == HFI1_LRH_GRH) { SDMA_DBG(req, "User tried to pass in a GRH"); ret = -EINVAL; goto free_req; } req->koffset = le32_to_cpu(req->hdr.kdeth.swdata[6]); /* * Calculate the initial TID offset based on the values of * KDETH.OFFSET and KDETH.OM that are passed in. */ req->tidoffset = KDETH_GET(req->hdr.kdeth.ver_tid_offset, OFFSET) * (KDETH_GET(req->hdr.kdeth.ver_tid_offset, OM) ? KDETH_OM_LARGE : KDETH_OM_SMALL); trace_hfi1_sdma_user_initial_tidoffset(dd, uctxt->ctxt, fd->subctxt, info.comp_idx, req->tidoffset); idx++; /* Save all the IO vector structures */ for (i = 0; i < req->data_iovs; i++) { req->iovs[i].offset = 0; INIT_LIST_HEAD(&req->iovs[i].list); memcpy(&req->iovs[i].iov, iovec + idx++, sizeof(req->iovs[i].iov)); if (req->iovs[i].iov.iov_len == 0) { ret = -EINVAL; goto free_req; } req->data_len += req->iovs[i].iov.iov_len; } trace_hfi1_sdma_user_data_length(dd, uctxt->ctxt, fd->subctxt, info.comp_idx, req->data_len); if (pcount > req->info.npkts) pcount = req->info.npkts; /* * Copy any TID info * User space will provide the TID info only when the * request type is EXPECTED. This is true even if there is * only one packet in the request and the header is already * setup. The reason for the singular TID case is that the * driver needs to perform safety checks. */ if (req_opcode(req->info.ctrl) == EXPECTED) { u16 ntids = iovec[idx].iov_len / sizeof(*req->tids); u32 *tmp; if (!ntids || ntids > MAX_TID_PAIR_ENTRIES) { ret = -EINVAL; goto free_req; } /* * We have to copy all of the tids because they may vary * in size and, therefore, the TID count might not be * equal to the pkt count. However, there is no way to * tell at this point. */ tmp = memdup_user(iovec[idx].iov_base, ntids * sizeof(*req->tids)); if (IS_ERR(tmp)) { ret = PTR_ERR(tmp); SDMA_DBG(req, "Failed to copy %d TIDs (%d)", ntids, ret); goto free_req; } req->tids = tmp; req->n_tids = ntids; req->tididx = 0; idx++; } dlid = be16_to_cpu(req->hdr.lrh[1]); selector = dlid_to_selector(dlid); selector += uctxt->ctxt + fd->subctxt; req->sde = sdma_select_user_engine(dd, selector, vl); if (!req->sde || !sdma_running(req->sde)) { ret = -ECOMM; goto free_req; } /* We don't need an AHG entry if the request contains only one packet */ if (req->info.npkts > 1 && HFI1_CAP_IS_USET(SDMA_AHG)) req->ahg_idx = sdma_ahg_alloc(req->sde); set_comp_state(pq, cq, info.comp_idx, QUEUED, 0); pq->state = SDMA_PKT_Q_ACTIVE; /* * This is a somewhat blocking send implementation. * The driver will block the caller until all packets of the * request have been submitted to the SDMA engine. However, it * will not wait for send completions. */ while (req->seqsubmitted != req->info.npkts) { ret = user_sdma_send_pkts(req, pcount); if (ret < 0) { int we_ret; if (ret != -EBUSY) goto free_req; we_ret = wait_event_interruptible_timeout( pq->busy.wait_dma, pq->state == SDMA_PKT_Q_ACTIVE, msecs_to_jiffies( SDMA_IOWAIT_TIMEOUT)); trace_hfi1_usdma_we(pq, we_ret); if (we_ret <= 0) flush_pq_iowait(pq); } } *count += idx; return 0; free_req: /* * If the submitted seqsubmitted == npkts, the completion routine * controls the final state. If sequbmitted < npkts, wait for any * outstanding packets to finish before cleaning up. */ if (req->seqsubmitted < req->info.npkts) { if (req->seqsubmitted) wait_event(pq->busy.wait_dma, (req->seqcomp == req->seqsubmitted - 1)); user_sdma_free_request(req); pq_update(pq); set_comp_state(pq, cq, info.comp_idx, ERROR, ret); } return ret; } static inline u32 compute_data_length(struct user_sdma_request *req, struct user_sdma_txreq *tx) { /* * Determine the proper size of the packet data. * The size of the data of the first packet is in the header * template. However, it includes the header and ICRC, which need * to be subtracted. * The minimum representable packet data length in a header is 4 bytes, * therefore, when the data length request is less than 4 bytes, there's * only one packet, and the packet data length is equal to that of the * request data length. * The size of the remaining packets is the minimum of the frag * size (MTU) or remaining data in the request. */ u32 len; if (!req->seqnum) { if (req->data_len < sizeof(u32)) len = req->data_len; else len = ((be16_to_cpu(req->hdr.lrh[2]) << 2) - (sizeof(tx->hdr) - 4)); } else if (req_opcode(req->info.ctrl) == EXPECTED) { u32 tidlen = EXP_TID_GET(req->tids[req->tididx], LEN) * PAGE_SIZE; /* * Get the data length based on the remaining space in the * TID pair. */ len = min(tidlen - req->tidoffset, (u32)req->info.fragsize); /* If we've filled up the TID pair, move to the next one. */ if (unlikely(!len) && ++req->tididx < req->n_tids && req->tids[req->tididx]) { tidlen = EXP_TID_GET(req->tids[req->tididx], LEN) * PAGE_SIZE; req->tidoffset = 0; len = min_t(u32, tidlen, req->info.fragsize); } /* * Since the TID pairs map entire pages, make sure that we * are not going to try to send more data that we have * remaining. */ len = min(len, req->data_len - req->sent); } else { len = min(req->data_len - req->sent, (u32)req->info.fragsize); } trace_hfi1_sdma_user_compute_length(req->pq->dd, req->pq->ctxt, req->pq->subctxt, req->info.comp_idx, len); return len; } static inline u32 pad_len(u32 len) { if (len & (sizeof(u32) - 1)) len += sizeof(u32) - (len & (sizeof(u32) - 1)); return len; } static inline u32 get_lrh_len(struct hfi1_pkt_header hdr, u32 len) { /* (Size of complete header - size of PBC) + 4B ICRC + data length */ return ((sizeof(hdr) - sizeof(hdr.pbc)) + 4 + len); } static int user_sdma_txadd_ahg(struct user_sdma_request *req, struct user_sdma_txreq *tx, u32 datalen) { int ret; u16 pbclen = le16_to_cpu(req->hdr.pbc[0]); u32 lrhlen = get_lrh_len(req->hdr, pad_len(datalen)); struct hfi1_user_sdma_pkt_q *pq = req->pq; /* * Copy the request header into the tx header * because the HW needs a cacheline-aligned * address. * This copy can be optimized out if the hdr * member of user_sdma_request were also * cacheline aligned. */ memcpy(&tx->hdr, &req->hdr, sizeof(tx->hdr)); if (PBC2LRH(pbclen) != lrhlen) { pbclen = (pbclen & 0xf000) | LRH2PBC(lrhlen); tx->hdr.pbc[0] = cpu_to_le16(pbclen); } ret = check_header_template(req, &tx->hdr, lrhlen, datalen); if (ret) return ret; ret = sdma_txinit_ahg(&tx->txreq, SDMA_TXREQ_F_AHG_COPY, sizeof(tx->hdr) + datalen, req->ahg_idx, 0, NULL, 0, user_sdma_txreq_cb); if (ret) return ret; ret = sdma_txadd_kvaddr(pq->dd, &tx->txreq, &tx->hdr, sizeof(tx->hdr)); if (ret) sdma_txclean(pq->dd, &tx->txreq); return ret; } static int user_sdma_send_pkts(struct user_sdma_request *req, u16 maxpkts) { int ret = 0; u16 count; unsigned npkts = 0; struct user_sdma_txreq *tx = NULL; struct hfi1_user_sdma_pkt_q *pq = NULL; struct user_sdma_iovec *iovec = NULL; if (!req->pq) return -EINVAL; pq = req->pq; /* If tx completion has reported an error, we are done. */ if (READ_ONCE(req->has_error)) return -EFAULT; /* * Check if we might have sent the entire request already */ if (unlikely(req->seqnum == req->info.npkts)) { if (!list_empty(&req->txps)) goto dosend; return ret; } if (!maxpkts || maxpkts > req->info.npkts - req->seqnum) maxpkts = req->info.npkts - req->seqnum; while (npkts < maxpkts) { u32 datalen = 0; /* * Check whether any of the completions have come back * with errors. If so, we are not going to process any * more packets from this request. */ if (READ_ONCE(req->has_error)) return -EFAULT; tx = kmem_cache_alloc(pq->txreq_cache, GFP_KERNEL); if (!tx) return -ENOMEM; tx->flags = 0; tx->req = req; INIT_LIST_HEAD(&tx->list); /* * For the last packet set the ACK request * and disable header suppression. */ if (req->seqnum == req->info.npkts - 1) tx->flags |= (TXREQ_FLAGS_REQ_ACK | TXREQ_FLAGS_REQ_DISABLE_SH); /* * Calculate the payload size - this is min of the fragment * (MTU) size or the remaining bytes in the request but only * if we have payload data. */ if (req->data_len) { iovec = &req->iovs[req->iov_idx]; if (READ_ONCE(iovec->offset) == iovec->iov.iov_len) { if (++req->iov_idx == req->data_iovs) { ret = -EFAULT; goto free_tx; } iovec = &req->iovs[req->iov_idx]; WARN_ON(iovec->offset); } datalen = compute_data_length(req, tx); /* * Disable header suppression for the payload <= 8DWS. * If there is an uncorrectable error in the receive * data FIFO when the received payload size is less than * or equal to 8DWS then the RxDmaDataFifoRdUncErr is * not reported.There is set RHF.EccErr if the header * is not suppressed. */ if (!datalen) { SDMA_DBG(req, "Request has data but pkt len is 0"); ret = -EFAULT; goto free_tx; } else if (datalen <= 32) { tx->flags |= TXREQ_FLAGS_REQ_DISABLE_SH; } } if (req->ahg_idx >= 0) { if (!req->seqnum) { ret = user_sdma_txadd_ahg(req, tx, datalen); if (ret) goto free_tx; } else { int changes; changes = set_txreq_header_ahg(req, tx, datalen); if (changes < 0) { ret = changes; goto free_tx; } } } else { ret = sdma_txinit(&tx->txreq, 0, sizeof(req->hdr) + datalen, user_sdma_txreq_cb); if (ret) goto free_tx; /* * Modify the header for this packet. This only needs * to be done if we are not going to use AHG. Otherwise, * the HW will do it based on the changes we gave it * during sdma_txinit_ahg(). */ ret = set_txreq_header(req, tx, datalen); if (ret) goto free_txreq; } req->koffset += datalen; if (req_opcode(req->info.ctrl) == EXPECTED) req->tidoffset += datalen; req->sent += datalen; while (datalen) { ret = add_system_pages_to_sdma_packet(req, tx, iovec, &datalen); if (ret) goto free_txreq; iovec = &req->iovs[req->iov_idx]; } list_add_tail(&tx->txreq.list, &req->txps); /* * It is important to increment this here as it is used to * generate the BTH.PSN and, therefore, can't be bulk-updated * outside of the loop. */ tx->seqnum = req->seqnum++; npkts++; } dosend: ret = sdma_send_txlist(req->sde, iowait_get_ib_work(&pq->busy), &req->txps, &count); req->seqsubmitted += count; if (req->seqsubmitted == req->info.npkts) { /* * The txreq has already been submitted to the HW queue * so we can free the AHG entry now. Corruption will not * happen due to the sequential manner in which * descriptors are processed. */ if (req->ahg_idx >= 0) sdma_ahg_free(req->sde, req->ahg_idx); } return ret; free_txreq: sdma_txclean(pq->dd, &tx->txreq); free_tx: kmem_cache_free(pq->txreq_cache, tx); return ret; } static u32 sdma_cache_evict(struct hfi1_user_sdma_pkt_q *pq, u32 npages) { struct evict_data evict_data; struct mmu_rb_handler *handler = pq->handler; evict_data.cleared = 0; evict_data.target = npages; hfi1_mmu_rb_evict(handler, &evict_data); return evict_data.cleared; } static int check_header_template(struct user_sdma_request *req, struct hfi1_pkt_header *hdr, u32 lrhlen, u32 datalen) { /* * Perform safety checks for any type of packet: * - transfer size is multiple of 64bytes * - packet length is multiple of 4 bytes * - packet length is not larger than MTU size * * These checks are only done for the first packet of the * transfer since the header is "given" to us by user space. * For the remainder of the packets we compute the values. */ if (req->info.fragsize % PIO_BLOCK_SIZE || lrhlen & 0x3 || lrhlen > get_lrh_len(*hdr, req->info.fragsize)) return -EINVAL; if (req_opcode(req->info.ctrl) == EXPECTED) { /* * The header is checked only on the first packet. Furthermore, * we ensure that at least one TID entry is copied when the * request is submitted. Therefore, we don't have to verify that * tididx points to something sane. */ u32 tidval = req->tids[req->tididx], tidlen = EXP_TID_GET(tidval, LEN) * PAGE_SIZE, tididx = EXP_TID_GET(tidval, IDX), tidctrl = EXP_TID_GET(tidval, CTRL), tidoff; __le32 kval = hdr->kdeth.ver_tid_offset; tidoff = KDETH_GET(kval, OFFSET) * (KDETH_GET(req->hdr.kdeth.ver_tid_offset, OM) ? KDETH_OM_LARGE : KDETH_OM_SMALL); /* * Expected receive packets have the following * additional checks: * - offset is not larger than the TID size * - TIDCtrl values match between header and TID array * - TID indexes match between header and TID array */ if ((tidoff + datalen > tidlen) || KDETH_GET(kval, TIDCTRL) != tidctrl || KDETH_GET(kval, TID) != tididx) return -EINVAL; } return 0; } /* * Correctly set the BTH.PSN field based on type of * transfer - eager packets can just increment the PSN but * expected packets encode generation and sequence in the * BTH.PSN field so just incrementing will result in errors. */ static inline u32 set_pkt_bth_psn(__be32 bthpsn, u8 expct, u32 frags) { u32 val = be32_to_cpu(bthpsn), mask = (HFI1_CAP_IS_KSET(EXTENDED_PSN) ? 0x7fffffffull : 0xffffffull), psn = val & mask; if (expct) psn = (psn & ~HFI1_KDETH_BTH_SEQ_MASK) | ((psn + frags) & HFI1_KDETH_BTH_SEQ_MASK); else psn = psn + frags; return psn & mask; } static int set_txreq_header(struct user_sdma_request *req, struct user_sdma_txreq *tx, u32 datalen) { struct hfi1_user_sdma_pkt_q *pq = req->pq; struct hfi1_pkt_header *hdr = &tx->hdr; u8 omfactor; /* KDETH.OM */ u16 pbclen; int ret; u32 tidval = 0, lrhlen = get_lrh_len(*hdr, pad_len(datalen)); /* Copy the header template to the request before modification */ memcpy(hdr, &req->hdr, sizeof(*hdr)); /* * Check if the PBC and LRH length are mismatched. If so * adjust both in the header. */ pbclen = le16_to_cpu(hdr->pbc[0]); if (PBC2LRH(pbclen) != lrhlen) { pbclen = (pbclen & 0xf000) | LRH2PBC(lrhlen); hdr->pbc[0] = cpu_to_le16(pbclen); hdr->lrh[2] = cpu_to_be16(lrhlen >> 2); /* * Third packet * This is the first packet in the sequence that has * a "static" size that can be used for the rest of * the packets (besides the last one). */ if (unlikely(req->seqnum == 2)) { /* * From this point on the lengths in both the * PBC and LRH are the same until the last * packet. * Adjust the template so we don't have to update * every packet */ req->hdr.pbc[0] = hdr->pbc[0]; req->hdr.lrh[2] = hdr->lrh[2]; } } /* * We only have to modify the header if this is not the * first packet in the request. Otherwise, we use the * header given to us. */ if (unlikely(!req->seqnum)) { ret = check_header_template(req, hdr, lrhlen, datalen); if (ret) return ret; goto done; } hdr->bth[2] = cpu_to_be32( set_pkt_bth_psn(hdr->bth[2], (req_opcode(req->info.ctrl) == EXPECTED), req->seqnum)); /* Set ACK request on last packet */ if (unlikely(tx->flags & TXREQ_FLAGS_REQ_ACK)) hdr->bth[2] |= cpu_to_be32(1UL << 31); /* Set the new offset */ hdr->kdeth.swdata[6] = cpu_to_le32(req->koffset); /* Expected packets have to fill in the new TID information */ if (req_opcode(req->info.ctrl) == EXPECTED) { tidval = req->tids[req->tididx]; /* * If the offset puts us at the end of the current TID, * advance everything. */ if ((req->tidoffset) == (EXP_TID_GET(tidval, LEN) * PAGE_SIZE)) { req->tidoffset = 0; /* * Since we don't copy all the TIDs, all at once, * we have to check again. */ if (++req->tididx > req->n_tids - 1 || !req->tids[req->tididx]) { return -EINVAL; } tidval = req->tids[req->tididx]; } omfactor = EXP_TID_GET(tidval, LEN) * PAGE_SIZE >= KDETH_OM_MAX_SIZE ? KDETH_OM_LARGE_SHIFT : KDETH_OM_SMALL_SHIFT; /* Set KDETH.TIDCtrl based on value for this TID. */ KDETH_SET(hdr->kdeth.ver_tid_offset, TIDCTRL, EXP_TID_GET(tidval, CTRL)); /* Set KDETH.TID based on value for this TID */ KDETH_SET(hdr->kdeth.ver_tid_offset, TID, EXP_TID_GET(tidval, IDX)); /* Clear KDETH.SH when DISABLE_SH flag is set */ if (unlikely(tx->flags & TXREQ_FLAGS_REQ_DISABLE_SH)) KDETH_SET(hdr->kdeth.ver_tid_offset, SH, 0); /* * Set the KDETH.OFFSET and KDETH.OM based on size of * transfer. */ trace_hfi1_sdma_user_tid_info( pq->dd, pq->ctxt, pq->subctxt, req->info.comp_idx, req->tidoffset, req->tidoffset >> omfactor, omfactor != KDETH_OM_SMALL_SHIFT); KDETH_SET(hdr->kdeth.ver_tid_offset, OFFSET, req->tidoffset >> omfactor); KDETH_SET(hdr->kdeth.ver_tid_offset, OM, omfactor != KDETH_OM_SMALL_SHIFT); } done: trace_hfi1_sdma_user_header(pq->dd, pq->ctxt, pq->subctxt, req->info.comp_idx, hdr, tidval); return sdma_txadd_kvaddr(pq->dd, &tx->txreq, hdr, sizeof(*hdr)); } static int set_txreq_header_ahg(struct user_sdma_request *req, struct user_sdma_txreq *tx, u32 datalen) { u32 ahg[AHG_KDETH_ARRAY_SIZE]; int idx = 0; u8 omfactor; /* KDETH.OM */ struct hfi1_user_sdma_pkt_q *pq = req->pq; struct hfi1_pkt_header *hdr = &req->hdr; u16 pbclen = le16_to_cpu(hdr->pbc[0]); u32 val32, tidval = 0, lrhlen = get_lrh_len(*hdr, pad_len(datalen)); size_t array_size = ARRAY_SIZE(ahg); if (PBC2LRH(pbclen) != lrhlen) { /* PBC.PbcLengthDWs */ idx = ahg_header_set(ahg, idx, array_size, 0, 0, 12, (__force u16)cpu_to_le16(LRH2PBC(lrhlen))); if (idx < 0) return idx; /* LRH.PktLen (we need the full 16 bits due to byte swap) */ idx = ahg_header_set(ahg, idx, array_size, 3, 0, 16, (__force u16)cpu_to_be16(lrhlen >> 2)); if (idx < 0) return idx; } /* * Do the common updates */ /* BTH.PSN and BTH.A */ val32 = (be32_to_cpu(hdr->bth[2]) + req->seqnum) & (HFI1_CAP_IS_KSET(EXTENDED_PSN) ? 0x7fffffff : 0xffffff); if (unlikely(tx->flags & TXREQ_FLAGS_REQ_ACK)) val32 |= 1UL << 31; idx = ahg_header_set(ahg, idx, array_size, 6, 0, 16, (__force u16)cpu_to_be16(val32 >> 16)); if (idx < 0) return idx; idx = ahg_header_set(ahg, idx, array_size, 6, 16, 16, (__force u16)cpu_to_be16(val32 & 0xffff)); if (idx < 0) return idx; /* KDETH.Offset */ idx = ahg_header_set(ahg, idx, array_size, 15, 0, 16, (__force u16)cpu_to_le16(req->koffset & 0xffff)); if (idx < 0) return idx; idx = ahg_header_set(ahg, idx, array_size, 15, 16, 16, (__force u16)cpu_to_le16(req->koffset >> 16)); if (idx < 0) return idx; if (req_opcode(req->info.ctrl) == EXPECTED) { __le16 val; tidval = req->tids[req->tididx]; /* * If the offset puts us at the end of the current TID, * advance everything. */ if ((req->tidoffset) == (EXP_TID_GET(tidval, LEN) * PAGE_SIZE)) { req->tidoffset = 0; /* * Since we don't copy all the TIDs, all at once, * we have to check again. */ if (++req->tididx > req->n_tids - 1 || !req->tids[req->tididx]) return -EINVAL; tidval = req->tids[req->tididx]; } omfactor = ((EXP_TID_GET(tidval, LEN) * PAGE_SIZE) >= KDETH_OM_MAX_SIZE) ? KDETH_OM_LARGE_SHIFT : KDETH_OM_SMALL_SHIFT; /* KDETH.OM and KDETH.OFFSET (TID) */ idx = ahg_header_set( ahg, idx, array_size, 7, 0, 16, ((!!(omfactor - KDETH_OM_SMALL_SHIFT)) << 15 | ((req->tidoffset >> omfactor) & 0x7fff))); if (idx < 0) return idx; /* KDETH.TIDCtrl, KDETH.TID, KDETH.Intr, KDETH.SH */ val = cpu_to_le16(((EXP_TID_GET(tidval, CTRL) & 0x3) << 10) | (EXP_TID_GET(tidval, IDX) & 0x3ff)); if (unlikely(tx->flags & TXREQ_FLAGS_REQ_DISABLE_SH)) { val |= cpu_to_le16((KDETH_GET(hdr->kdeth.ver_tid_offset, INTR) << AHG_KDETH_INTR_SHIFT)); } else { val |= KDETH_GET(hdr->kdeth.ver_tid_offset, SH) ? cpu_to_le16(0x1 << AHG_KDETH_SH_SHIFT) : cpu_to_le16((KDETH_GET(hdr->kdeth.ver_tid_offset, INTR) << AHG_KDETH_INTR_SHIFT)); } idx = ahg_header_set(ahg, idx, array_size, 7, 16, 14, (__force u16)val); if (idx < 0) return idx; } trace_hfi1_sdma_user_header_ahg(pq->dd, pq->ctxt, pq->subctxt, req->info.comp_idx, req->sde->this_idx, req->ahg_idx, ahg, idx, tidval); sdma_txinit_ahg(&tx->txreq, SDMA_TXREQ_F_USE_AHG, datalen, req->ahg_idx, idx, ahg, sizeof(req->hdr), user_sdma_txreq_cb); return idx; } /** * user_sdma_txreq_cb() - SDMA tx request completion callback. * @txreq: valid sdma tx request * @status: success/failure of request * * Called when the SDMA progress state machine gets notification that * the SDMA descriptors for this tx request have been processed by the * DMA engine. Called in interrupt context. * Only do work on completed sequences. */ static void user_sdma_txreq_cb(struct sdma_txreq *txreq, int status) { struct user_sdma_txreq *tx = container_of(txreq, struct user_sdma_txreq, txreq); struct user_sdma_request *req; struct hfi1_user_sdma_pkt_q *pq; struct hfi1_user_sdma_comp_q *cq; enum hfi1_sdma_comp_state state = COMPLETE; if (!tx->req) return; req = tx->req; pq = req->pq; cq = req->cq; if (status != SDMA_TXREQ_S_OK) { SDMA_DBG(req, "SDMA completion with error %d", status); WRITE_ONCE(req->has_error, 1); state = ERROR; } req->seqcomp = tx->seqnum; kmem_cache_free(pq->txreq_cache, tx); /* sequence isn't complete? We are done */ if (req->seqcomp != req->info.npkts - 1) return; user_sdma_free_request(req); set_comp_state(pq, cq, req->info.comp_idx, state, status); pq_update(pq); } static inline void pq_update(struct hfi1_user_sdma_pkt_q *pq) { if (atomic_dec_and_test(&pq->n_reqs)) wake_up(&pq->wait); } static void user_sdma_free_request(struct user_sdma_request *req) { if (!list_empty(&req->txps)) { struct sdma_txreq *t, *p; list_for_each_entry_safe(t, p, &req->txps, list) { struct user_sdma_txreq *tx = container_of(t, struct user_sdma_txreq, txreq); list_del_init(&t->list); sdma_txclean(req->pq->dd, t); kmem_cache_free(req->pq->txreq_cache, tx); } } kfree(req->tids); clear_bit(req->info.comp_idx, req->pq->req_in_use); } static inline void set_comp_state(struct hfi1_user_sdma_pkt_q *pq, struct hfi1_user_sdma_comp_q *cq, u16 idx, enum hfi1_sdma_comp_state state, int ret) { if (state == ERROR) cq->comps[idx].errcode = -ret; smp_wmb(); /* make sure errcode is visible first */ cq->comps[idx].status = state; trace_hfi1_sdma_user_completion(pq->dd, pq->ctxt, pq->subctxt, idx, state, ret); } static void unpin_vector_pages(struct mm_struct *mm, struct page **pages, unsigned int start, unsigned int npages) { hfi1_release_user_pages(mm, pages + start, npages, false); kfree(pages); } static void free_system_node(struct sdma_mmu_node *node) { if (node->npages) { unpin_vector_pages(mm_from_sdma_node(node), node->pages, 0, node->npages); atomic_sub(node->npages, &node->pq->n_locked); } kfree(node); } /* * kref_get()'s an additional kref on the returned rb_node to prevent rb_node * from being released until after rb_node is assigned to an SDMA descriptor * (struct sdma_desc) under add_system_iovec_to_sdma_packet(), even if the * virtual address range for rb_node is invalidated between now and then. */ static struct sdma_mmu_node *find_system_node(struct mmu_rb_handler *handler, unsigned long start, unsigned long end) { struct mmu_rb_node *rb_node; unsigned long flags; spin_lock_irqsave(&handler->lock, flags); rb_node = hfi1_mmu_rb_get_first(handler, start, (end - start)); if (!rb_node) { spin_unlock_irqrestore(&handler->lock, flags); return NULL; } /* "safety" kref to prevent release before add_system_iovec_to_sdma_packet() */ kref_get(&rb_node->refcount); spin_unlock_irqrestore(&handler->lock, flags); return container_of(rb_node, struct sdma_mmu_node, rb); } static int pin_system_pages(struct user_sdma_request *req, uintptr_t start_address, size_t length, struct sdma_mmu_node *node, int npages) { struct hfi1_user_sdma_pkt_q *pq = req->pq; int pinned, cleared; struct page **pages; pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL); if (!pages) return -ENOMEM; retry: if (!hfi1_can_pin_pages(pq->dd, current->mm, atomic_read(&pq->n_locked), npages)) { SDMA_DBG(req, "Evicting: nlocked %u npages %u", atomic_read(&pq->n_locked), npages); cleared = sdma_cache_evict(pq, npages); if (cleared >= npages) goto retry; } SDMA_DBG(req, "Acquire user pages start_address %lx node->npages %u npages %u", start_address, node->npages, npages); pinned = hfi1_acquire_user_pages(current->mm, start_address, npages, 0, pages); if (pinned < 0) { kfree(pages); SDMA_DBG(req, "pinned %d", pinned); return pinned; } if (pinned != npages) { unpin_vector_pages(current->mm, pages, node->npages, pinned); SDMA_DBG(req, "npages %u pinned %d", npages, pinned); return -EFAULT; } node->rb.addr = start_address; node->rb.len = length; node->pages = pages; node->npages = npages; atomic_add(pinned, &pq->n_locked); SDMA_DBG(req, "done. pinned %d", pinned); return 0; } /* * kref refcount on *node_p will be 2 on successful addition: one kref from * kref_init() for mmu_rb_handler and one kref to prevent *node_p from being * released until after *node_p is assigned to an SDMA descriptor (struct * sdma_desc) under add_system_iovec_to_sdma_packet(), even if the virtual * address range for *node_p is invalidated between now and then. */ static int add_system_pinning(struct user_sdma_request *req, struct sdma_mmu_node **node_p, unsigned long start, unsigned long len) { struct hfi1_user_sdma_pkt_q *pq = req->pq; struct sdma_mmu_node *node; int ret; node = kzalloc(sizeof(*node), GFP_KERNEL); if (!node) return -ENOMEM; /* First kref "moves" to mmu_rb_handler */ kref_init(&node->rb.refcount); /* "safety" kref to prevent release before add_system_iovec_to_sdma_packet() */ kref_get(&node->rb.refcount); node->pq = pq; ret = pin_system_pages(req, start, len, node, PFN_DOWN(len)); if (ret == 0) { ret = hfi1_mmu_rb_insert(pq->handler, &node->rb); if (ret) free_system_node(node); else *node_p = node; return ret; } kfree(node); return ret; } static int get_system_cache_entry(struct user_sdma_request *req, struct sdma_mmu_node **node_p, size_t req_start, size_t req_len) { struct hfi1_user_sdma_pkt_q *pq = req->pq; u64 start = ALIGN_DOWN(req_start, PAGE_SIZE); u64 end = PFN_ALIGN(req_start + req_len); struct mmu_rb_handler *handler = pq->handler; int ret; if ((end - start) == 0) { SDMA_DBG(req, "Request for empty cache entry req_start %lx req_len %lx start %llx end %llx", req_start, req_len, start, end); return -EINVAL; } SDMA_DBG(req, "req_start %lx req_len %lu", req_start, req_len); while (1) { struct sdma_mmu_node *node = find_system_node(handler, start, end); u64 prepend_len = 0; SDMA_DBG(req, "node %p start %llx end %llu", node, start, end); if (!node) { ret = add_system_pinning(req, node_p, start, end - start); if (ret == -EEXIST) { /* * Another execution context has inserted a * conficting entry first. */ continue; } return ret; } if (node->rb.addr <= start) { /* * This entry covers at least part of the region. If it doesn't extend * to the end, then this will be called again for the next segment. */ *node_p = node; return 0; } SDMA_DBG(req, "prepend: node->rb.addr %lx, node->rb.refcount %d", node->rb.addr, kref_read(&node->rb.refcount)); prepend_len = node->rb.addr - start; /* * This node will not be returned, instead a new node * will be. So release the reference. */ kref_put(&node->rb.refcount, hfi1_mmu_rb_release); /* Prepend a node to cover the beginning of the allocation */ ret = add_system_pinning(req, node_p, start, prepend_len); if (ret == -EEXIST) { /* Another execution context has inserted a conficting entry first. */ continue; } return ret; } } static void sdma_mmu_rb_node_get(void *ctx) { struct mmu_rb_node *node = ctx; kref_get(&node->refcount); } static void sdma_mmu_rb_node_put(void *ctx) { struct sdma_mmu_node *node = ctx; kref_put(&node->rb.refcount, hfi1_mmu_rb_release); } static int add_mapping_to_sdma_packet(struct user_sdma_request *req, struct user_sdma_txreq *tx, struct sdma_mmu_node *cache_entry, size_t start, size_t from_this_cache_entry) { struct hfi1_user_sdma_pkt_q *pq = req->pq; unsigned int page_offset; unsigned int from_this_page; size_t page_index; void *ctx; int ret; /* * Because the cache may be more fragmented than the memory that is being accessed, * it's not strictly necessary to have a descriptor per cache entry. */ while (from_this_cache_entry) { page_index = PFN_DOWN(start - cache_entry->rb.addr); if (page_index >= cache_entry->npages) { SDMA_DBG(req, "Request for page_index %zu >= cache_entry->npages %u", page_index, cache_entry->npages); return -EINVAL; } page_offset = start - ALIGN_DOWN(start, PAGE_SIZE); from_this_page = PAGE_SIZE - page_offset; if (from_this_page < from_this_cache_entry) { ctx = NULL; } else { /* * In the case they are equal the next line has no practical effect, * but it's better to do a register to register copy than a conditional * branch. */ from_this_page = from_this_cache_entry; ctx = cache_entry; } ret = sdma_txadd_page(pq->dd, &tx->txreq, cache_entry->pages[page_index], page_offset, from_this_page, ctx, sdma_mmu_rb_node_get, sdma_mmu_rb_node_put); if (ret) { /* * When there's a failure, the entire request is freed by * user_sdma_send_pkts(). */ SDMA_DBG(req, "sdma_txadd_page failed %d page_index %lu page_offset %u from_this_page %u", ret, page_index, page_offset, from_this_page); return ret; } start += from_this_page; from_this_cache_entry -= from_this_page; } return 0; } static int add_system_iovec_to_sdma_packet(struct user_sdma_request *req, struct user_sdma_txreq *tx, struct user_sdma_iovec *iovec, size_t from_this_iovec) { while (from_this_iovec > 0) { struct sdma_mmu_node *cache_entry; size_t from_this_cache_entry; size_t start; int ret; start = (uintptr_t)iovec->iov.iov_base + iovec->offset; ret = get_system_cache_entry(req, &cache_entry, start, from_this_iovec); if (ret) { SDMA_DBG(req, "pin system segment failed %d", ret); return ret; } from_this_cache_entry = cache_entry->rb.len - (start - cache_entry->rb.addr); if (from_this_cache_entry > from_this_iovec) from_this_cache_entry = from_this_iovec; ret = add_mapping_to_sdma_packet(req, tx, cache_entry, start, from_this_cache_entry); /* * Done adding cache_entry to zero or more sdma_desc. Can * kref_put() the "safety" kref taken under * get_system_cache_entry(). */ kref_put(&cache_entry->rb.refcount, hfi1_mmu_rb_release); if (ret) { SDMA_DBG(req, "add system segment failed %d", ret); return ret; } iovec->offset += from_this_cache_entry; from_this_iovec -= from_this_cache_entry; } return 0; } static int add_system_pages_to_sdma_packet(struct user_sdma_request *req, struct user_sdma_txreq *tx, struct user_sdma_iovec *iovec, u32 *pkt_data_remaining) { size_t remaining_to_add = *pkt_data_remaining; /* * Walk through iovec entries, ensure the associated pages * are pinned and mapped, add data to the packet until no more * data remains to be added. */ while (remaining_to_add > 0) { struct user_sdma_iovec *cur_iovec; size_t from_this_iovec; int ret; cur_iovec = iovec; from_this_iovec = iovec->iov.iov_len - iovec->offset; if (from_this_iovec > remaining_to_add) { from_this_iovec = remaining_to_add; } else { /* The current iovec entry will be consumed by this pass. */ req->iov_idx++; iovec++; } ret = add_system_iovec_to_sdma_packet(req, tx, cur_iovec, from_this_iovec); if (ret) return ret; remaining_to_add -= from_this_iovec; } *pkt_data_remaining = remaining_to_add; return 0; } static bool sdma_rb_filter(struct mmu_rb_node *node, unsigned long addr, unsigned long len) { return (bool)(node->addr == addr); } /* * Return 1 to remove the node from the rb tree and call the remove op. * * Called with the rb tree lock held. */ static int sdma_rb_evict(void *arg, struct mmu_rb_node *mnode, void *evict_arg, bool *stop) { struct sdma_mmu_node *node = container_of(mnode, struct sdma_mmu_node, rb); struct evict_data *evict_data = evict_arg; /* this node will be evicted, add its pages to our count */ evict_data->cleared += node->npages; /* have enough pages been cleared? */ if (evict_data->cleared >= evict_data->target) *stop = true; return 1; /* remove this node */ } static void sdma_rb_remove(void *arg, struct mmu_rb_node *mnode) { struct sdma_mmu_node *node = container_of(mnode, struct sdma_mmu_node, rb); free_system_node(node); }