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tegrakernel/kernel/kernel-4.9/drivers/infiniband/hw/hfi1/user_sdma.c

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/*
* 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 AHG_KDETH_INTR_SHIFT 12
#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)
/* SDMA request flag bits */
#define SDMA_REQ_HAVE_AHG 1
#define SDMA_REQ_HAS_ERROR 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 sdma_mmu_node;
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 *node;
};
struct sdma_mmu_node {
struct mmu_rb_node rb;
struct hfi1_user_sdma_pkt_q *pq;
atomic_t refcount;
struct page **pages;
unsigned npages;
};
/* evict operation argument */
struct evict_data {
u32 cleared; /* count evicted so far */
u32 target; /* target count to evict */
};
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;
};
/*
* 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;
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(void *, struct mmu_rb_node *);
static int sdma_rb_evict(void *arg, struct mmu_rb_node *mnode,
void *arg2, bool *stop);
static void sdma_rb_remove(void *, struct mmu_rb_node *);
static int sdma_rb_invalidate(void *, struct mmu_rb_node *);
static struct mmu_rb_ops sdma_rb_ops = {
.filter = sdma_rb_filter,
.insert = sdma_rb_insert,
.evict = sdma_rb_evict,
.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;
write_seqlock(&dev->iowait_lock);
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))
list_add_tail(&pq->busy.list, &sde->dmawait);
write_sequnlock(&dev->iowait_lock);
return -EBUSY;
eagain:
write_sequnlock(&dev->iowait_lock);
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;
memsize = BITS_TO_LONGS(hfi1_sdma_comp_ring_size) * sizeof(long);
pq->req_in_use = kzalloc(memsize, GFP_KERNEL);
if (!pq->req_in_use)
goto pq_reqs_no_in_use;
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;
atomic_set(&pq->n_reqs, 0);
init_waitqueue_head(&pq->wait);
atomic_set(&pq->n_locked, 0);
pq->mm = fd->mm;
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, pq->mm, &sdma_rb_ops, dd->pport->hfi1_wq,
&pq->handler);
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->req_in_use);
pq_reqs_no_in_use:
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;
if (pq) {
if (pq->handler)
hfi1_mmu_rb_unregister(pq->handler);
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,
!atomic_read(&pq->n_reqs));
kfree(pq->reqs);
kfree(pq->req_in_use);
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;
}
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
* @fp: valid file pointer
* @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 file *fp, struct iovec *iovec,
unsigned long dim, unsigned long *count)
{
int ret = 0, i;
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;
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.
*/
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));
req->data_iovs = req_iovcnt(info.ctrl) - 1; /* subtract header vector */
req->pq = pq;
req->cq = cq;
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 */
if (egress_pkey_check(dd->pport, req->hdr.lrh, req->hdr.bth, 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);
SDMA_DBG(req, "Initial TID offset %u", req->tidoffset);
idx++;
/* Save all the IO vector structures */
for (i = 0; i < req->data_iovs; i++) {
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->data_iovs = i;
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++;
}
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)) {
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);
pq->state = SDMA_PKT_Q_ACTIVE;
/* 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))
goto free_req;
/*
* 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) {
if (ret != -EBUSY)
goto free_req;
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:
/*
* 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, true);
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);
}
SDMA_DBG(req, "Data Length = %u", 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_send_pkts(struct user_sdma_request *req, unsigned maxpkts)
{
int ret = 0, 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 (test_bit(SDMA_REQ_HAS_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))
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);
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_tx;
}
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,
pad_len(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, &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 (test_bit(SDMA_REQ_HAVE_AHG, &req->flags))
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;
}
/*
* 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);
}
static u32 sdma_cache_evict(struct hfi1_user_sdma_pkt_q *pq, u32 npages)
{
struct evict_data evict_data;
evict_data.cleared = 0;
evict_data.target = npages;
hfi1_mmu_rb_evict(pq->handler, &evict_data);
return evict_data.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_extract(pq->handler,
(unsigned long)iovec->iov.iov_base,
iovec->iov.iov_len);
if (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->pq = pq;
atomic_set(&node->refcount, 0);
}
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->mm,
atomic_read(&pq->n_locked), npages)) {
cleared = sdma_cache_evict(pq, npages);
if (cleared >= npages)
goto retry;
}
pinned = hfi1_acquire_user_pages(pq->mm,
((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(pq->mm, pages, node->npages,
pinned);
ret = -EFAULT;
goto bail;
}
kfree(node->pages);
node->rb.len = iovec->iov.iov_len;
node->pages = pages;
node->npages += pinned;
npages = node->npages;
atomic_add(pinned, &pq->n_locked);
}
iovec->pages = node->pages;
iovec->npages = npages;
iovec->node = node;
ret = hfi1_mmu_rb_insert(req->pq->handler, &node->rb);
if (ret) {
atomic_sub(node->npages, &pq->n_locked);
iovec->node = NULL;
goto bail;
}
return 0;
bail:
if (rb_node)
unpin_vector_pages(pq->mm, node->pages, 0, node->npages);
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, false);
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 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 & ~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, 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_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, pad_len(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) <<
AHG_KDETH_INTR_SHIFT);
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;
}
/**
* 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);
set_bit(SDMA_REQ_HAS_ERROR, &req->flags);
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, false);
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, 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;
int i;
for (i = 0; i < req->data_iovs; i++) {
node = req->iovs[i].node;
if (!node)
continue;
req->iovs[i].node = NULL;
if (unpin)
hfi1_mmu_rb_remove(req->pq->handler,
&node->rb);
else
atomic_dec(&node->refcount);
}
}
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)
{
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(void *arg, struct mmu_rb_node *mnode)
{
struct sdma_mmu_node *node =
container_of(mnode, struct sdma_mmu_node, rb);
atomic_inc(&node->refcount);
return 0;
}
/*
* 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;
/* is this node still being used? */
if (atomic_read(&node->refcount))
return 0; /* keep this node */
/* 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);
atomic_sub(node->npages, &node->pq->n_locked);
unpin_vector_pages(node->pq->mm, node->pages, 0, node->npages);
kfree(node);
}
static int sdma_rb_invalidate(void *arg, 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;
}
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