Linux-libre 4.7.1-gnupck-4.7.1-gnu

1 files changed, 0 insertions, 1590 deletions

diff --git a/drivers/staging/rdma/hfi1/user_sdma.c b/drivers/staging/rdma/hfi1/user_sdma.c
deleted file mode 100644
index d53a65954..000000000
--- a/drivers/staging/rdma/hfi1/user_sdma.c
+++ /dev/null
@@ -1,1590 +0,0 @@
-/*
- * Copyright(c) 2015, 2016 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 <linux/mm.h>
-#include <linux/types.h>
-#include <linux/device.h>
-#include <linux/dmapool.h>
-#include <linux/slab.h>
-#include <linux/list.h>
-#include <linux/highmem.h>
-#include <linux/io.h>
-#include <linux/uio.h>
-#include <linux/rbtree.h>
-#include <linux/spinlock.h>
-#include <linux/delay.h>
-#include <linux/kthread.h>
-#include <linux/mmu_context.h>
-#include <linux/module.h>
-#include <linux/vmalloc.h>
-
-#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"
-#include "mmu_rb.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");
-
-/* The maximum number of Data io vectors per message/request */
-#define MAX_VECTORS_PER_REQ 8
-/*
- * Maximum number of packet to send from each message/request
- * before moving to the next one.
- */
-#define MAX_PKTS_PER_QUEUE 16
-
-#define num_pages(x) (1 + ((((x) - 1) & PAGE_MASK) >> PAGE_SHIFT))
-
-#define req_opcode(x) \
-	(((x) >> HFI1_SDMA_REQ_OPCODE_SHIFT) & HFI1_SDMA_REQ_OPCODE_MASK)
-#define req_version(x) \
-	(((x) >> HFI1_SDMA_REQ_VERSION_SHIFT) & HFI1_SDMA_REQ_OPCODE_MASK)
-#define req_iovcnt(x) \
-	(((x) >> HFI1_SDMA_REQ_IOVCNT_SHIFT) & HFI1_SDMA_REQ_IOVCNT_MASK)
-
-/* Number of BTH.PSN bits used for sequence number in expected rcvs */
-#define BTH_SEQ_MASK 0x7ffull
-
-/*
- * Define fields in the KDETH header so we can update the header
- * template.
- */
-#define KDETH_OFFSET_SHIFT        0
-#define KDETH_OFFSET_MASK         0x7fff
-#define KDETH_OM_SHIFT            15
-#define KDETH_OM_MASK             0x1
-#define KDETH_TID_SHIFT           16
-#define KDETH_TID_MASK            0x3ff
-#define KDETH_TIDCTRL_SHIFT       26
-#define KDETH_TIDCTRL_MASK        0x3
-#define KDETH_INTR_SHIFT          28
-#define KDETH_INTR_MASK           0x1
-#define KDETH_SH_SHIFT            29
-#define KDETH_SH_MASK             0x1
-#define KDETH_HCRC_UPPER_SHIFT    16
-#define KDETH_HCRC_UPPER_MASK     0xff
-#define KDETH_HCRC_LOWER_SHIFT    24
-#define KDETH_HCRC_LOWER_MASK     0xff
-
-#define PBC2LRH(x) ((((x) & 0xfff) << 2) - 4)
-#define LRH2PBC(x) ((((x) >> 2) + 1) & 0xfff)
-
-#define KDETH_GET(val, field)						\
-	(((le32_to_cpu((val))) >> KDETH_##field##_SHIFT) & KDETH_##field##_MASK)
-#define KDETH_SET(dw, field, val) do {					\
-		u32 dwval = le32_to_cpu(dw);				\
-		dwval &= ~(KDETH_##field##_MASK << KDETH_##field##_SHIFT); \
-		dwval |= (((val) & KDETH_##field##_MASK) << \
-			  KDETH_##field##_SHIFT);			\
-		dw = cpu_to_le32(dwval);				\
-	} while (0)
-
-#define AHG_HEADER_SET(arr, idx, dw, bit, width, value)			\
-	do {								\
-		if ((idx) < ARRAY_SIZE((arr)))				\
-			(arr)[(idx++)] = sdma_build_ahg_descriptor(	\
-				(__force u16)(value), (dw), (bit),	\
-							(width));	\
-		else							\
-			return -ERANGE;					\
-	} while (0)
-
-/* KDETH OM multipliers and switch over point */
-#define KDETH_OM_SMALL     4
-#define KDETH_OM_LARGE     64
-#define KDETH_OM_MAX_SIZE  (1 << ((KDETH_OM_LARGE / KDETH_OM_SMALL) + 1))
-
-/* Last packet in the request */
-#define TXREQ_FLAGS_REQ_LAST_PKT BIT(0)
-
-#define SDMA_REQ_IN_USE     0
-#define SDMA_REQ_FOR_THREAD 1
-#define SDMA_REQ_SEND_DONE  2
-#define SDMA_REQ_HAVE_AHG   3
-#define SDMA_REQ_HAS_ERROR  4
-#define SDMA_REQ_DONE_ERROR 5
-
-#define SDMA_PKT_Q_INACTIVE BIT(0)
-#define SDMA_PKT_Q_ACTIVE   BIT(1)
-#define SDMA_PKT_Q_DEFERRED BIT(2)
-
-/*
- * Maximum retry attempts to submit a TX request
- * before putting the process to sleep.
- */
-#define MAX_DEFER_RETRY_COUNT 1
-
-static unsigned initial_pkt_count = 8;
-
-#define SDMA_IOWAIT_TIMEOUT 1000 /* in milliseconds */
-
-struct user_sdma_iovec {
-	struct list_head list;
-	struct iovec iov;
-	/* number of pages in this vector */
-	unsigned npages;
-	/* array of pinned pages for this vector */
-	struct page **pages;
-	/*
-	 * offset into the virtual address space of the vector at
-	 * which we last left off.
-	 */
-	u64 offset;
-};
-
-struct sdma_mmu_node {
-	struct mmu_rb_node rb;
-	struct list_head list;
-	struct hfi1_user_sdma_pkt_q *pq;
-	atomic_t refcount;
-	struct page **pages;
-	unsigned npages;
-};
-
-struct user_sdma_request {
-	struct sdma_req_info info;
-	struct hfi1_user_sdma_pkt_q *pq;
-	struct hfi1_user_sdma_comp_q *cq;
-	/* This is the original header from user space */
-	struct hfi1_pkt_header hdr;
-	/*
-	 * Pointer to the SDMA engine for this request.
-	 * Since different request could be on different VLs,
-	 * each request will need it's own engine pointer.
-	 */
-	struct sdma_engine *sde;
-	u8 ahg_idx;
-	u32 ahg[9];
-	/*
-	 * KDETH.Offset (Eager) field
-	 * We need to remember the initial value so the headers
-	 * can be updated properly.
-	 */
-	u32 koffset;
-	/*
-	 * KDETH.OFFSET (TID) field
-	 * The offset can cover multiple packets, depending on the
-	 * size of the TID entry.
-	 */
-	u32 tidoffset;
-	/*
-	 * KDETH.OM
-	 * Remember this because the header template always sets it
-	 * to 0.
-	 */
-	u8 omfactor;
-	/*
-	 * We copy the iovs for this request (based on
-	 * info.iovcnt). These are only the data vectors
-	 */
-	unsigned data_iovs;
-	/* total length of the data in the request */
-	u32 data_len;
-	/* progress index moving along the iovs array */
-	unsigned iov_idx;
-	struct user_sdma_iovec iovs[MAX_VECTORS_PER_REQ];
-	/* number of elements copied to the tids array */
-	u16 n_tids;
-	/* TID array values copied from the tid_iov vector */
-	u32 *tids;
-	u16 tididx;
-	u32 sent;
-	u64 seqnum;
-	u64 seqcomp;
-	u64 seqsubmitted;
-	struct list_head txps;
-	unsigned long flags;
-	/* status of the last txreq completed */
-	int status;
-};
-
-/*
- * A single txreq could span up to 3 physical pages when the MTU
- * is sufficiently large (> 4K). Each of the IOV pointers also
- * needs it's own set of flags so the vector has been handled
- * independently of each other.
- */
-struct user_sdma_txreq {
-	/* Packet header for the txreq */
-	struct hfi1_pkt_header hdr;
-	struct sdma_txreq txreq;
-	struct list_head list;
-	struct user_sdma_request *req;
-	u16 flags;
-	unsigned busycount;
-	u64 seqnum;
-};
-
-#define SDMA_DBG(req, fmt, ...)				     \
-	hfi1_cdbg(SDMA, "[%u:%u:%u:%u] " fmt, (req)->pq->dd->unit, \
-		 (req)->pq->ctxt, (req)->pq->subctxt, (req)->info.comp_idx, \
-		 ##__VA_ARGS__)
-#define SDMA_Q_DBG(pq, fmt, ...)			 \
-	hfi1_cdbg(SDMA, "[%u:%u:%u] " fmt, (pq)->dd->unit, (pq)->ctxt, \
-		 (pq)->subctxt, ##__VA_ARGS__)
-
-static int user_sdma_send_pkts(struct user_sdma_request *, unsigned);
-static int num_user_pages(const struct iovec *);
-static void user_sdma_txreq_cb(struct sdma_txreq *, int);
-static inline void pq_update(struct hfi1_user_sdma_pkt_q *);
-static void user_sdma_free_request(struct user_sdma_request *, bool);
-static int pin_vector_pages(struct user_sdma_request *,
-			    struct user_sdma_iovec *);
-static void unpin_vector_pages(struct mm_struct *, struct page **, unsigned,
-			       unsigned);
-static int check_header_template(struct user_sdma_request *,
-				 struct hfi1_pkt_header *, u32, u32);
-static int set_txreq_header(struct user_sdma_request *,
-			    struct user_sdma_txreq *, u32);
-static int set_txreq_header_ahg(struct user_sdma_request *,
-				struct user_sdma_txreq *, u32);
-static inline void set_comp_state(struct hfi1_user_sdma_pkt_q *,
-				  struct hfi1_user_sdma_comp_q *,
-				  u16, enum hfi1_sdma_comp_state, int);
-static inline u32 set_pkt_bth_psn(__be32, u8, u32);
-static inline u32 get_lrh_len(struct hfi1_pkt_header, u32 len);
-
-static int defer_packet_queue(
-	struct sdma_engine *,
-	struct iowait *,
-	struct sdma_txreq *,
-	unsigned seq);
-static void activate_packet_queue(struct iowait *, int);
-static bool sdma_rb_filter(struct mmu_rb_node *, unsigned long, unsigned long);
-static int sdma_rb_insert(struct rb_root *, struct mmu_rb_node *);
-static void sdma_rb_remove(struct rb_root *, struct mmu_rb_node *,
-			   struct mm_struct *);
-static int sdma_rb_invalidate(struct rb_root *, struct mmu_rb_node *);
-
-static struct mmu_rb_ops sdma_rb_ops = {
-	.filter = sdma_rb_filter,
-	.insert = sdma_rb_insert,
-	.remove = sdma_rb_remove,
-	.invalidate = sdma_rb_invalidate
-};
-
-static int defer_packet_queue(
-	struct sdma_engine *sde,
-	struct iowait *wait,
-	struct sdma_txreq *txreq,
-	unsigned seq)
-{
-	struct hfi1_user_sdma_pkt_q *pq =
-		container_of(wait, struct hfi1_user_sdma_pkt_q, busy);
-	struct hfi1_ibdev *dev = &pq->dd->verbs_dev;
-	struct user_sdma_txreq *tx =
-		container_of(txreq, struct user_sdma_txreq, txreq);
-
-	if (sdma_progress(sde, seq, txreq)) {
-		if (tx->busycount++ < MAX_DEFER_RETRY_COUNT)
-			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);
-	write_seqlock(&dev->iowait_lock);
-	if (list_empty(&pq->busy.list))
-		list_add_tail(&pq->busy.list, &sde->dmawait);
-	write_sequnlock(&dev->iowait_lock);
-	return -EBUSY;
-eagain:
-	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);
-	xchg(&pq->state, SDMA_PKT_Q_ACTIVE);
-	wake_up(&wait->wait_dma);
-};
-
-static void sdma_kmem_cache_ctor(void *obj)
-{
-	struct user_sdma_txreq *tx = obj;
-
-	memset(tx, 0, sizeof(*tx));
-}
-
-int hfi1_user_sdma_alloc_queues(struct hfi1_ctxtdata *uctxt, struct file *fp)
-{
-	struct hfi1_filedata *fd;
-	int ret = 0;
-	unsigned memsize;
-	char buf[64];
-	struct hfi1_devdata *dd;
-	struct hfi1_user_sdma_comp_q *cq;
-	struct hfi1_user_sdma_pkt_q *pq;
-	unsigned long flags;
-
-	if (!uctxt || !fp) {
-		ret = -EBADF;
-		goto done;
-	}
-
-	fd = fp->private_data;
-
-	if (!hfi1_sdma_comp_ring_size) {
-		ret = -EINVAL;
-		goto done;
-	}
-
-	dd = uctxt->dd;
-
-	pq = kzalloc(sizeof(*pq), GFP_KERNEL);
-	if (!pq)
-		goto pq_nomem;
-
-	memsize = sizeof(*pq->reqs) * hfi1_sdma_comp_ring_size;
-	pq->reqs = kzalloc(memsize, GFP_KERNEL);
-	if (!pq->reqs)
-		goto pq_reqs_nomem;
-
-	INIT_LIST_HEAD(&pq->list);
-	pq->dd = dd;
-	pq->ctxt = uctxt->ctxt;
-	pq->subctxt = fd->subctxt;
-	pq->n_max_reqs = hfi1_sdma_comp_ring_size;
-	pq->state = SDMA_PKT_Q_INACTIVE;
-	atomic_set(&pq->n_reqs, 0);
-	init_waitqueue_head(&pq->wait);
-	pq->sdma_rb_root = RB_ROOT;
-	INIT_LIST_HEAD(&pq->evict);
-	spin_lock_init(&pq->evict_lock);
-
-	iowait_init(&pq->busy, 0, NULL, defer_packet_queue,
-		    activate_packet_queue, NULL);
-	pq->reqidx = 0;
-	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,
-					    sdma_kmem_cache_ctor);
-	if (!pq->txreq_cache) {
-		dd_dev_err(dd, "[%u] Failed to allocate TxReq cache\n",
-			   uctxt->ctxt);
-		goto pq_txreq_nomem;
-	}
-	fd->pq = pq;
-	cq = kzalloc(sizeof(*cq), GFP_KERNEL);
-	if (!cq)
-		goto cq_nomem;
-
-	memsize = PAGE_ALIGN(sizeof(*cq->comps) * hfi1_sdma_comp_ring_size);
-	cq->comps = vmalloc_user(memsize);
-	if (!cq->comps)
-		goto cq_comps_nomem;
-
-	cq->nentries = hfi1_sdma_comp_ring_size;
-	fd->cq = cq;
-
-	ret = hfi1_mmu_rb_register(&pq->sdma_rb_root, &sdma_rb_ops);
-	if (ret) {
-		dd_dev_err(dd, "Failed to register with MMU %d", ret);
-		goto done;
-	}
-
-	spin_lock_irqsave(&uctxt->sdma_qlock, flags);
-	list_add(&pq->list, &uctxt->sdma_queues);
-	spin_unlock_irqrestore(&uctxt->sdma_qlock, flags);
-	goto done;
-
-cq_comps_nomem:
-	kfree(cq);
-cq_nomem:
-	kmem_cache_destroy(pq->txreq_cache);
-pq_txreq_nomem:
-	kfree(pq->reqs);
-pq_reqs_nomem:
-	kfree(pq);
-	fd->pq = NULL;
-pq_nomem:
-	ret = -ENOMEM;
-done:
-	return ret;
-}
-
-int hfi1_user_sdma_free_queues(struct hfi1_filedata *fd)
-{
-	struct hfi1_ctxtdata *uctxt = fd->uctxt;
-	struct hfi1_user_sdma_pkt_q *pq;
-	unsigned long flags;
-
-	hfi1_cdbg(SDMA, "[%u:%u:%u] Freeing user SDMA queues", uctxt->dd->unit,
-		  uctxt->ctxt, fd->subctxt);
-	pq = fd->pq;
-	hfi1_mmu_rb_unregister(&pq->sdma_rb_root);
-	if (pq) {
-		spin_lock_irqsave(&uctxt->sdma_qlock, flags);
-		if (!list_empty(&pq->list))
-			list_del_init(&pq->list);
-		spin_unlock_irqrestore(&uctxt->sdma_qlock, flags);
-		iowait_sdma_drain(&pq->busy);
-		/* Wait until all requests have been freed. */
-		wait_event_interruptible(
-			pq->wait,
-			(ACCESS_ONCE(pq->state) == SDMA_PKT_Q_INACTIVE));
-		kfree(pq->reqs);
-		kmem_cache_destroy(pq->txreq_cache);
-		kfree(pq);
-		fd->pq = NULL;
-	}
-	if (fd->cq) {
-		vfree(fd->cq->comps);
-		kfree(fd->cq);
-		fd->cq = NULL;
-	}
-	return 0;
-}
-
-int hfi1_user_sdma_process_request(struct file *fp, struct iovec *iovec,
-				   unsigned long dim, unsigned long *count)
-{
-	int ret = 0, i = 0;
-	struct hfi1_filedata *fd = fp->private_data;
-	struct hfi1_ctxtdata *uctxt = fd->uctxt;
-	struct hfi1_user_sdma_pkt_q *pq = fd->pq;
-	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;
-
-	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 (cq->comps[info.comp_idx].status == QUEUED ||
-	    test_bit(SDMA_REQ_IN_USE, &pq->reqs[info.comp_idx].flags)) {
-		hfi1_cdbg(SDMA, "[%u:%u:%u] Entry %u is in QUEUED state",
-			  dd->unit, uctxt->ctxt, fd->subctxt,
-			  info.comp_idx);
-		return -EBADSLT;
-	}
-	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;
-	}
-	/*
-	 * We've done all the safety checks that we can up to this point,
-	 * "allocate" the request entry.
-	 */
-	hfi1_cdbg(SDMA, "[%u:%u:%u] Using req/comp entry %u\n", dd->unit,
-		  uctxt->ctxt, fd->subctxt, info.comp_idx);
-	req = pq->reqs + info.comp_idx;
-	memset(req, 0, sizeof(*req));
-	/* Mark the request as IN_USE before we start filling it in. */
-	set_bit(SDMA_REQ_IN_USE, &req->flags);
-	req->data_iovs = req_iovcnt(info.ctrl) - 1;
-	req->pq = pq;
-	req->cq = cq;
-	req->status = -1;
-	INIT_LIST_HEAD(&req->txps);
-
-	memcpy(&req->info, &info, sizeof(info));
-
-	if (req_opcode(info.ctrl) == EXPECTED)
-		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);
-		return -EINVAL;
-	}
-	/* 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;
-	}
-
-	/*
-	 * 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);
-	SDMA_DBG(req, "Initial TID offset %u", req->tidoffset);
-	idx++;
-
-	/* Save all the IO vector structures */
-	while (i < req->data_iovs) {
-		INIT_LIST_HEAD(&req->iovs[i].list);
-		memcpy(&req->iovs[i].iov, iovec + idx++, sizeof(struct iovec));
-		ret = pin_vector_pages(req, &req->iovs[i]);
-		if (ret) {
-			req->status = ret;
-			goto free_req;
-		}
-		req->data_len += req->iovs[i++].iov.iov_len;
-	}
-	SDMA_DBG(req, "total data length %u", 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);
-
-		if (!ntids || ntids > MAX_TID_PAIR_ENTRIES) {
-			ret = -EINVAL;
-			goto free_req;
-		}
-		req->tids = kcalloc(ntids, sizeof(*req->tids), GFP_KERNEL);
-		if (!req->tids) {
-			ret = -ENOMEM;
-			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.
-		 */
-		ret = copy_from_user(req->tids, iovec[idx].iov_base,
-				     ntids * sizeof(*req->tids));
-		if (ret) {
-			SDMA_DBG(req, "Failed to copy %d TIDs (%d)",
-				 ntids, ret);
-			ret = -EFAULT;
-			goto free_req;
-		}
-		req->n_tids = ntids;
-		idx++;
-	}
-
-	/* Have to select the engine */
-	req->sde = sdma_select_engine_vl(dd,
-					 (u32)(uctxt->ctxt + fd->subctxt),
-					 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)) {
-		int ahg = sdma_ahg_alloc(req->sde);
-
-		if (likely(ahg >= 0)) {
-			req->ahg_idx = (u8)ahg;
-			set_bit(SDMA_REQ_HAVE_AHG, &req->flags);
-		}
-	}
-
-	set_comp_state(pq, cq, info.comp_idx, QUEUED, 0);
-	atomic_inc(&pq->n_reqs);
-	/* Send the first N packets in the request to buy us some time */
-	ret = user_sdma_send_pkts(req, pcount);
-	if (unlikely(ret < 0 && ret != -EBUSY)) {
-		req->status = ret;
-		goto free_req;
-	}
-
-	/*
-	 * It is possible that the SDMA engine would have processed all the
-	 * submitted packets by the time we get here. Therefore, only set
-	 * packet queue state to ACTIVE if there are still uncompleted
-	 * requests.
-	 */
-	if (atomic_read(&pq->n_reqs))
-		xchg(&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 (!test_bit(SDMA_REQ_SEND_DONE, &req->flags)) {
-		ret = user_sdma_send_pkts(req, pcount);
-		if (ret < 0) {
-			if (ret != -EBUSY) {
-				req->status = ret;
-				set_bit(SDMA_REQ_DONE_ERROR, &req->flags);
-				if (ACCESS_ONCE(req->seqcomp) ==
-				    req->seqsubmitted - 1)
-					goto free_req;
-				return ret;
-			}
-			wait_event_interruptible_timeout(
-				pq->busy.wait_dma,
-				(pq->state == SDMA_PKT_Q_ACTIVE),
-				msecs_to_jiffies(
-					SDMA_IOWAIT_TIMEOUT));
-		}
-	}
-	*count += idx;
-	return 0;
-free_req:
-	user_sdma_free_request(req, true);
-	pq_update(pq);
-	set_comp_state(pq, cq, info.comp_idx, ERROR, req->status);
-	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 size of the remaining packets is the minimum of the frag
-	 * size (MTU) or remaining data in the request.
-	 */
-	u32 len;
-
-	if (!req->seqnum) {
-		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);
-	}
-	SDMA_DBG(req, "Data Length = %u", len);
-	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_send_pkts(struct user_sdma_request *req, unsigned maxpkts)
-{
-	int ret = 0;
-	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 (test_bit(SDMA_REQ_HAS_ERROR, &req->flags)) {
-		set_bit(SDMA_REQ_DONE_ERROR, &req->flags);
-		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, queued = 0, data_sent = 0;
-		u64 iov_offset = 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 (test_bit(SDMA_REQ_HAS_ERROR, &req->flags)) {
-			set_bit(SDMA_REQ_DONE_ERROR, &req->flags);
-			return -EFAULT;
-		}
-
-		tx = kmem_cache_alloc(pq->txreq_cache, GFP_KERNEL);
-		if (!tx)
-			return -ENOMEM;
-
-		tx->flags = 0;
-		tx->req = req;
-		tx->busycount = 0;
-		INIT_LIST_HEAD(&tx->list);
-
-		if (req->seqnum == req->info.npkts - 1)
-			tx->flags |= TXREQ_FLAGS_REQ_LAST_PKT;
-
-		/*
-		 * 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 (ACCESS_ONCE(iovec->offset) == iovec->iov.iov_len) {
-				if (++req->iov_idx == req->data_iovs) {
-					ret = -EFAULT;
-					goto free_txreq;
-				}
-				iovec = &req->iovs[req->iov_idx];
-				WARN_ON(iovec->offset);
-			}
-
-			datalen = compute_data_length(req, tx);
-			if (!datalen) {
-				SDMA_DBG(req,
-					 "Request has data but pkt len is 0");
-				ret = -EFAULT;
-				goto free_tx;
-			}
-		}
-
-		if (test_bit(SDMA_REQ_HAVE_AHG, &req->flags)) {
-			if (!req->seqnum) {
-				u16 pbclen = le16_to_cpu(req->hdr.pbc[0]);
-				u32 lrhlen = get_lrh_len(req->hdr, datalen);
-				/*
-				 * 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 = 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)
-					goto free_tx;
-				ret = sdma_txadd_kvaddr(pq->dd, &tx->txreq,
-							&tx->hdr,
-							sizeof(tx->hdr));
-				if (ret)
-					goto free_txreq;
-			} else {
-				int changes;
-
-				changes = set_txreq_header_ahg(req, tx,
-							       datalen);
-				if (changes < 0)
-					goto free_tx;
-				sdma_txinit_ahg(&tx->txreq,
-						SDMA_TXREQ_F_USE_AHG,
-						datalen, req->ahg_idx, changes,
-						req->ahg, sizeof(req->hdr),
-						user_sdma_txreq_cb);
-			}
-		} 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;
-		}
-
-		/*
-		 * If the request contains any data vectors, add up to
-		 * fragsize bytes to the descriptor.
-		 */
-		while (queued < datalen &&
-		       (req->sent + data_sent) < req->data_len) {
-			unsigned long base, offset;
-			unsigned pageidx, len;
-
-			base = (unsigned long)iovec->iov.iov_base;
-			offset = offset_in_page(base + iovec->offset +
-						iov_offset);
-			pageidx = (((iovec->offset + iov_offset +
-				     base) - (base & PAGE_MASK)) >> PAGE_SHIFT);
-			len = offset + req->info.fragsize > PAGE_SIZE ?
-				PAGE_SIZE - offset : req->info.fragsize;
-			len = min((datalen - queued), len);
-			ret = sdma_txadd_page(pq->dd, &tx->txreq,
-					      iovec->pages[pageidx],
-					      offset, len);
-			if (ret) {
-				SDMA_DBG(req, "SDMA txreq add page failed %d\n",
-					 ret);
-				goto free_txreq;
-			}
-			iov_offset += len;
-			queued += len;
-			data_sent += len;
-			if (unlikely(queued < datalen &&
-				     pageidx == iovec->npages &&
-				     req->iov_idx < req->data_iovs - 1)) {
-				iovec->offset += iov_offset;
-				iovec = &req->iovs[++req->iov_idx];
-				iov_offset = 0;
-			}
-		}
-		/*
-		 * The txreq was submitted successfully so we can update
-		 * the counters.
-		 */
-		req->koffset += datalen;
-		if (req_opcode(req->info.ctrl) == EXPECTED)
-			req->tidoffset += datalen;
-		req->sent += data_sent;
-		if (req->data_len)
-			iovec->offset += iov_offset;
-		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, &pq->busy, &req->txps);
-	if (list_empty(&req->txps)) {
-		req->seqsubmitted = req->seqnum;
-		if (req->seqnum == req->info.npkts) {
-			set_bit(SDMA_REQ_SEND_DONE, &req->flags);
-			/*
-			 * 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 (test_bit(SDMA_REQ_HAVE_AHG, &req->flags))
-				sdma_ahg_free(req->sde, req->ahg_idx);
-		}
-	} else if (ret > 0) {
-		req->seqsubmitted += ret;
-		ret = 0;
-	}
-	return ret;
-
-free_txreq:
-	sdma_txclean(pq->dd, &tx->txreq);
-free_tx:
-	kmem_cache_free(pq->txreq_cache, tx);
-	return ret;
-}
-
-/*
- * How many pages in this iovec element?
- */
-static inline int num_user_pages(const struct iovec *iov)
-{
-	const unsigned long addr  = (unsigned long)iov->iov_base;
-	const unsigned long len   = iov->iov_len;
-	const unsigned long spage = addr & PAGE_MASK;
-	const unsigned long epage = (addr + len - 1) & PAGE_MASK;
-
-	return 1 + ((epage - spage) >> PAGE_SHIFT);
-}
-
-/* Caller must hold pq->evict_lock */
-static u32 sdma_cache_evict(struct hfi1_user_sdma_pkt_q *pq, u32 npages)
-{
-	u32 cleared = 0;
-	struct sdma_mmu_node *node, *ptr;
-
-	list_for_each_entry_safe_reverse(node, ptr, &pq->evict, list) {
-		/* Make sure that no one is still using the node. */
-		if (!atomic_read(&node->refcount)) {
-			/*
-			 * Need to use the page count now as the remove callback
-			 * will free the node.
-			 */
-			cleared += node->npages;
-			spin_unlock(&pq->evict_lock);
-			hfi1_mmu_rb_remove(&pq->sdma_rb_root, &node->rb);
-			spin_lock(&pq->evict_lock);
-			if (cleared >= npages)
-				break;
-		}
-	}
-	return cleared;
-}
-
-static int pin_vector_pages(struct user_sdma_request *req,
-			    struct user_sdma_iovec *iovec) {
-	int ret = 0, pinned, npages, cleared;
-	struct page **pages;
-	struct hfi1_user_sdma_pkt_q *pq = req->pq;
-	struct sdma_mmu_node *node = NULL;
-	struct mmu_rb_node *rb_node;
-
-	rb_node = hfi1_mmu_rb_search(&pq->sdma_rb_root,
-				     (unsigned long)iovec->iov.iov_base,
-				     iovec->iov.iov_len);
-	if (rb_node && !IS_ERR(rb_node))
-		node = container_of(rb_node, struct sdma_mmu_node, rb);
-	else
-		rb_node = NULL;
-
-	if (!node) {
-		node = kzalloc(sizeof(*node), GFP_KERNEL);
-		if (!node)
-			return -ENOMEM;
-
-		node->rb.addr = (unsigned long)iovec->iov.iov_base;
-		node->rb.len = iovec->iov.iov_len;
-		node->pq = pq;
-		atomic_set(&node->refcount, 0);
-		INIT_LIST_HEAD(&node->list);
-	}
-
-	npages = num_user_pages(&iovec->iov);
-	if (node->npages < npages) {
-		pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL);
-		if (!pages) {
-			SDMA_DBG(req, "Failed page array alloc");
-			ret = -ENOMEM;
-			goto bail;
-		}
-		memcpy(pages, node->pages, node->npages * sizeof(*pages));
-
-		npages -= node->npages;
-retry:
-		if (!hfi1_can_pin_pages(pq->dd, pq->n_locked, npages)) {
-			spin_lock(&pq->evict_lock);
-			cleared = sdma_cache_evict(pq, npages);
-			spin_unlock(&pq->evict_lock);
-			if (cleared >= npages)
-				goto retry;
-		}
-		pinned = hfi1_acquire_user_pages(
-			((unsigned long)iovec->iov.iov_base +
-			 (node->npages * PAGE_SIZE)), npages, 0,
-			pages + node->npages);
-		if (pinned < 0) {
-			kfree(pages);
-			ret = pinned;
-			goto bail;
-		}
-		if (pinned != npages) {
-			unpin_vector_pages(current->mm, pages, node->npages,
-					   pinned);
-			ret = -EFAULT;
-			goto bail;
-		}
-		kfree(node->pages);
-		node->pages = pages;
-		node->npages += pinned;
-		npages = node->npages;
-		spin_lock(&pq->evict_lock);
-		if (!rb_node)
-			list_add(&node->list, &pq->evict);
-		else
-			list_move(&node->list, &pq->evict);
-		pq->n_locked += pinned;
-		spin_unlock(&pq->evict_lock);
-	}
-	iovec->pages = node->pages;
-	iovec->npages = npages;
-
-	if (!rb_node) {
-		ret = hfi1_mmu_rb_insert(&req->pq->sdma_rb_root, &node->rb);
-		if (ret) {
-			spin_lock(&pq->evict_lock);
-			list_del(&node->list);
-			pq->n_locked -= node->npages;
-			spin_unlock(&pq->evict_lock);
-			ret = 0;
-			goto bail;
-		}
-	} else {
-		atomic_inc(&node->refcount);
-	}
-	return 0;
-bail:
-	if (!rb_node)
-		kfree(node);
-	return ret;
-}
-
-static void unpin_vector_pages(struct mm_struct *mm, struct page **pages,
-			       unsigned start, unsigned npages)
-{
-	hfi1_release_user_pages(mm, pages + start, npages, 0);
-	kfree(pages);
-}
-
-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 4bytes
-	 *    - entire request length is multiple of 4bytes
-	 *    - 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 || req->data_len & 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 & ~BTH_SEQ_MASK) | ((psn + frags) & 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;
-	u16 pbclen;
-	int ret;
-	u32 tidval = 0, lrhlen = get_lrh_len(*hdr, 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_LAST_PKT))
-		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];
-		}
-		req->omfactor = EXP_TID_GET(tidval, LEN) * PAGE_SIZE >=
-			KDETH_OM_MAX_SIZE ? KDETH_OM_LARGE : KDETH_OM_SMALL;
-		/* 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 only on the last packet */
-		if (unlikely(tx->flags & TXREQ_FLAGS_REQ_LAST_PKT))
-			KDETH_SET(hdr->kdeth.ver_tid_offset, SH, 0);
-		/*
-		 * Set the KDETH.OFFSET and KDETH.OM based on size of
-		 * transfer.
-		 */
-		SDMA_DBG(req, "TID offset %ubytes %uunits om%u",
-			 req->tidoffset, req->tidoffset / req->omfactor,
-			 !!(req->omfactor - KDETH_OM_SMALL));
-		KDETH_SET(hdr->kdeth.ver_tid_offset, OFFSET,
-			  req->tidoffset / req->omfactor);
-		KDETH_SET(hdr->kdeth.ver_tid_offset, OM,
-			  !!(req->omfactor - KDETH_OM_SMALL));
-	}
-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 len)
-{
-	int diff = 0;
-	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, len);
-
-	if (PBC2LRH(pbclen) != lrhlen) {
-		/* PBC.PbcLengthDWs */
-		AHG_HEADER_SET(req->ahg, diff, 0, 0, 12,
-			       cpu_to_le16(LRH2PBC(lrhlen)));
-		/* LRH.PktLen (we need the full 16 bits due to byte swap) */
-		AHG_HEADER_SET(req->ahg, diff, 3, 0, 16,
-			       cpu_to_be16(lrhlen >> 2));
-	}
-
-	/*
-	 * 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_LAST_PKT))
-		val32 |= 1UL << 31;
-	AHG_HEADER_SET(req->ahg, diff, 6, 0, 16, cpu_to_be16(val32 >> 16));
-	AHG_HEADER_SET(req->ahg, diff, 6, 16, 16, cpu_to_be16(val32 & 0xffff));
-	/* KDETH.Offset */
-	AHG_HEADER_SET(req->ahg, diff, 15, 0, 16,
-		       cpu_to_le16(req->koffset & 0xffff));
-	AHG_HEADER_SET(req->ahg, diff, 15, 16, 16,
-		       cpu_to_le16(req->koffset >> 16));
-	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];
-		}
-		req->omfactor = ((EXP_TID_GET(tidval, LEN) *
-				  PAGE_SIZE) >=
-				 KDETH_OM_MAX_SIZE) ? KDETH_OM_LARGE :
-			KDETH_OM_SMALL;
-		/* KDETH.OM and KDETH.OFFSET (TID) */
-		AHG_HEADER_SET(req->ahg, diff, 7, 0, 16,
-			       ((!!(req->omfactor - KDETH_OM_SMALL)) << 15 |
-				((req->tidoffset / req->omfactor) & 0x7fff)));
-		/* KDETH.TIDCtrl, KDETH.TID */
-		val = cpu_to_le16(((EXP_TID_GET(tidval, CTRL) & 0x3) << 10) |
-					(EXP_TID_GET(tidval, IDX) & 0x3ff));
-		/* Clear KDETH.SH on last packet */
-		if (unlikely(tx->flags & TXREQ_FLAGS_REQ_LAST_PKT)) {
-			val |= cpu_to_le16(KDETH_GET(hdr->kdeth.ver_tid_offset,
-								INTR) >> 16);
-			val &= cpu_to_le16(~(1U << 13));
-			AHG_HEADER_SET(req->ahg, diff, 7, 16, 14, val);
-		} else {
-			AHG_HEADER_SET(req->ahg, diff, 7, 16, 12, val);
-		}
-	}
-
-	trace_hfi1_sdma_user_header_ahg(pq->dd, pq->ctxt, pq->subctxt,
-					req->info.comp_idx, req->sde->this_idx,
-					req->ahg_idx, req->ahg, diff, tidval);
-	return diff;
-}
-
-/*
- * SDMA tx request completion callback. 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.
- */
-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;
-	u16 idx;
-
-	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);
-		set_bit(SDMA_REQ_HAS_ERROR, &req->flags);
-	}
-
-	req->seqcomp = tx->seqnum;
-	kmem_cache_free(pq->txreq_cache, tx);
-	tx = NULL;
-
-	idx = req->info.comp_idx;
-	if (req->status == -1 && status == SDMA_TXREQ_S_OK) {
-		if (req->seqcomp == req->info.npkts - 1) {
-			req->status = 0;
-			user_sdma_free_request(req, false);
-			pq_update(pq);
-			set_comp_state(pq, cq, idx, COMPLETE, 0);
-		}
-	} else {
-		if (status != SDMA_TXREQ_S_OK)
-			req->status = status;
-		if (req->seqcomp == (ACCESS_ONCE(req->seqsubmitted) - 1) &&
-		    (test_bit(SDMA_REQ_SEND_DONE, &req->flags) ||
-		     test_bit(SDMA_REQ_DONE_ERROR, &req->flags))) {
-			user_sdma_free_request(req, false);
-			pq_update(pq);
-			set_comp_state(pq, cq, idx, ERROR, req->status);
-		}
-	}
-}
-
-static inline void pq_update(struct hfi1_user_sdma_pkt_q *pq)
-{
-	if (atomic_dec_and_test(&pq->n_reqs)) {
-		xchg(&pq->state, SDMA_PKT_Q_INACTIVE);
-		wake_up(&pq->wait);
-	}
-}
-
-static void user_sdma_free_request(struct user_sdma_request *req, bool unpin)
-{
-	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);
-		}
-	}
-	if (req->data_iovs) {
-		struct sdma_mmu_node *node;
-		struct mmu_rb_node *mnode;
-		int i;
-
-		for (i = 0; i < req->data_iovs; i++) {
-			mnode = hfi1_mmu_rb_search(
-				&req->pq->sdma_rb_root,
-				(unsigned long)req->iovs[i].iov.iov_base,
-				req->iovs[i].iov.iov_len);
-			if (!mnode || IS_ERR(mnode))
-				continue;
-
-			node = container_of(mnode, struct sdma_mmu_node, rb);
-			if (unpin)
-				hfi1_mmu_rb_remove(&req->pq->sdma_rb_root,
-						   &node->rb);
-			else
-				atomic_dec(&node->refcount);
-		}
-	}
-	kfree(req->tids);
-	clear_bit(SDMA_REQ_IN_USE, &req->flags);
-}
-
-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)
-{
-	hfi1_cdbg(SDMA, "[%u:%u:%u:%u] Setting completion status %u %d",
-		  pq->dd->unit, pq->ctxt, pq->subctxt, idx, state, ret);
-	cq->comps[idx].status = state;
-	if (state == ERROR)
-		cq->comps[idx].errcode = -ret;
-	trace_hfi1_sdma_user_completion(pq->dd, pq->ctxt, pq->subctxt,
-					idx, state, ret);
-}
-
-static bool sdma_rb_filter(struct mmu_rb_node *node, unsigned long addr,
-			   unsigned long len)
-{
-	return (bool)(node->addr == addr);
-}
-
-static int sdma_rb_insert(struct rb_root *root, struct mmu_rb_node *mnode)
-{
-	struct sdma_mmu_node *node =
-		container_of(mnode, struct sdma_mmu_node, rb);
-
-	atomic_inc(&node->refcount);
-	return 0;
-}
-
-static void sdma_rb_remove(struct rb_root *root, struct mmu_rb_node *mnode,
-			   struct mm_struct *mm)
-{
-	struct sdma_mmu_node *node =
-		container_of(mnode, struct sdma_mmu_node, rb);
-
-	spin_lock(&node->pq->evict_lock);
-	list_del(&node->list);
-	node->pq->n_locked -= node->npages;
-	spin_unlock(&node->pq->evict_lock);
-
-	/*
-	 * If mm is set, we are being called by the MMU notifier and we
-	 * should not pass a mm_struct to unpin_vector_page(). This is to
-	 * prevent a deadlock when hfi1_release_user_pages() attempts to
-	 * take the mmap_sem, which the MMU notifier has already taken.
-	 */
-	unpin_vector_pages(mm ? NULL : current->mm, node->pages, 0,
-			   node->npages);
-	/*
-	 * If called by the MMU notifier, we have to adjust the pinned
-	 * page count ourselves.
-	 */
-	if (mm)
-		mm->pinned_vm -= node->npages;
-	kfree(node);
-}
-
-static int sdma_rb_invalidate(struct rb_root *root, struct mmu_rb_node *mnode)
-{
-	struct sdma_mmu_node *node =
-		container_of(mnode, struct sdma_mmu_node, rb);
-
-	if (!atomic_read(&node->refcount))
-		return 1;
-	return 0;
-}