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linux-zen-server/drivers/infiniband/hw/qib/qib_user_sdma.c

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Initial commit
2023-08-30 17:53:23 +02:00
/*
* Copyright (c) 2007, 2008, 2009 QLogic Corporation. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <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 "qib.h"
#include "qib_user_sdma.h"
/* minimum size of header */
#define QIB_USER_SDMA_MIN_HEADER_LENGTH 64
/* expected size of headers (for dma_pool) */
#define QIB_USER_SDMA_EXP_HEADER_LENGTH 64
/* attempt to drain the queue for 5secs */
#define QIB_USER_SDMA_DRAIN_TIMEOUT 250
/*
* track how many times a process open this driver.
*/
static struct rb_root qib_user_sdma_rb_root = RB_ROOT;
struct qib_user_sdma_rb_node {
struct rb_node node;
int refcount;
pid_t pid;
};
struct qib_user_sdma_pkt {
struct list_head list; /* list element */
u8 tiddma; /* if this is NEW tid-sdma */
u8 largepkt; /* this is large pkt from kmalloc */
u16 frag_size; /* frag size used by PSM */
u16 index; /* last header index or push index */
u16 naddr; /* dimension of addr (1..3) ... */
u16 addrlimit; /* addr array size */
u16 tidsmidx; /* current tidsm index */
u16 tidsmcount; /* tidsm array item count */
u16 payload_size; /* payload size so far for header */
u32 bytes_togo; /* bytes for processing */
u32 counter; /* sdma pkts queued counter for this entry */
struct qib_tid_session_member *tidsm; /* tid session member array */
struct qib_user_sdma_queue *pq; /* which pq this pkt belongs to */
u64 added; /* global descq number of entries */
struct {
u16 offset; /* offset for kvaddr, addr */
u16 length; /* length in page */
u16 first_desc; /* first desc */
u16 last_desc; /* last desc */
u16 put_page; /* should we put_page? */
u16 dma_mapped; /* is page dma_mapped? */
u16 dma_length; /* for dma_unmap_page() */
u16 padding;
struct page *page; /* may be NULL (coherent mem) */
void *kvaddr; /* FIXME: only for pio hack */
dma_addr_t addr;
} addr[4]; /* max pages, any more and we coalesce */
};
struct qib_user_sdma_queue {
/*
* pkts sent to dma engine are queued on this
* list head. the type of the elements of this
* list are struct qib_user_sdma_pkt...
*/
struct list_head sent;
/*
* Because above list will be accessed by both process and
* signal handler, we need a spinlock for it.
*/
spinlock_t sent_lock ____cacheline_aligned_in_smp;
/* headers with expected length are allocated from here... */
char header_cache_name[64];
struct dma_pool *header_cache;
/* packets are allocated from the slab cache... */
char pkt_slab_name[64];
struct kmem_cache *pkt_slab;
/* as packets go on the queued queue, they are counted... */
u32 counter;
u32 sent_counter;
/* pending packets, not sending yet */
u32 num_pending;
/* sending packets, not complete yet */
u32 num_sending;
/* global descq number of entry of last sending packet */
u64 added;
/* dma page table */
struct rb_root dma_pages_root;
struct qib_user_sdma_rb_node *sdma_rb_node;
/* protect everything above... */
struct mutex lock;
};
static struct qib_user_sdma_rb_node *
qib_user_sdma_rb_search(struct rb_root *root, pid_t pid)
{
struct qib_user_sdma_rb_node *sdma_rb_node;
struct rb_node *node = root->rb_node;
while (node) {
sdma_rb_node = rb_entry(node, struct qib_user_sdma_rb_node,
node);
if (pid < sdma_rb_node->pid)
node = node->rb_left;
else if (pid > sdma_rb_node->pid)
node = node->rb_right;
else
return sdma_rb_node;
}
return NULL;
}
static int
qib_user_sdma_rb_insert(struct rb_root *root, struct qib_user_sdma_rb_node *new)
{
struct rb_node **node = &(root->rb_node);
struct rb_node *parent = NULL;
struct qib_user_sdma_rb_node *got;
while (*node) {
got = rb_entry(*node, struct qib_user_sdma_rb_node, node);
parent = *node;
if (new->pid < got->pid)
node = &((*node)->rb_left);
else if (new->pid > got->pid)
node = &((*node)->rb_right);
else
return 0;
}
rb_link_node(&new->node, parent, node);
rb_insert_color(&new->node, root);
return 1;
}
struct qib_user_sdma_queue *
qib_user_sdma_queue_create(struct device *dev, int unit, int ctxt, int sctxt)
{
struct qib_user_sdma_queue *pq =
kmalloc(sizeof(struct qib_user_sdma_queue), GFP_KERNEL);
struct qib_user_sdma_rb_node *sdma_rb_node;
if (!pq)
goto done;
pq->counter = 0;
pq->sent_counter = 0;
pq->num_pending = 0;
pq->num_sending = 0;
pq->added = 0;
pq->sdma_rb_node = NULL;
INIT_LIST_HEAD(&pq->sent);
spin_lock_init(&pq->sent_lock);
mutex_init(&pq->lock);
snprintf(pq->pkt_slab_name, sizeof(pq->pkt_slab_name),
"qib-user-sdma-pkts-%u-%02u.%02u", unit, ctxt, sctxt);
pq->pkt_slab = kmem_cache_create(pq->pkt_slab_name,
sizeof(struct qib_user_sdma_pkt),
0, 0, NULL);
if (!pq->pkt_slab)
goto err_kfree;
snprintf(pq->header_cache_name, sizeof(pq->header_cache_name),
"qib-user-sdma-headers-%u-%02u.%02u", unit, ctxt, sctxt);
pq->header_cache = dma_pool_create(pq->header_cache_name,
dev,
QIB_USER_SDMA_EXP_HEADER_LENGTH,
4, 0);
if (!pq->header_cache)
goto err_slab;
pq->dma_pages_root = RB_ROOT;
sdma_rb_node = qib_user_sdma_rb_search(&qib_user_sdma_rb_root,
current->pid);
if (sdma_rb_node) {
sdma_rb_node->refcount++;
} else {
sdma_rb_node = kmalloc(sizeof(
struct qib_user_sdma_rb_node), GFP_KERNEL);
if (!sdma_rb_node)
goto err_rb;
sdma_rb_node->refcount = 1;
sdma_rb_node->pid = current->pid;
qib_user_sdma_rb_insert(&qib_user_sdma_rb_root, sdma_rb_node);
}
pq->sdma_rb_node = sdma_rb_node;
goto done;
err_rb:
dma_pool_destroy(pq->header_cache);
err_slab:
kmem_cache_destroy(pq->pkt_slab);
err_kfree:
kfree(pq);
pq = NULL;
done:
return pq;
}
static void qib_user_sdma_init_frag(struct qib_user_sdma_pkt *pkt,
int i, u16 offset, u16 len,
u16 first_desc, u16 last_desc,
u16 put_page, u16 dma_mapped,
struct page *page, void *kvaddr,
dma_addr_t dma_addr, u16 dma_length)
{
pkt->addr[i].offset = offset;
pkt->addr[i].length = len;
pkt->addr[i].first_desc = first_desc;
pkt->addr[i].last_desc = last_desc;
pkt->addr[i].put_page = put_page;
pkt->addr[i].dma_mapped = dma_mapped;
pkt->addr[i].page = page;
pkt->addr[i].kvaddr = kvaddr;
pkt->addr[i].addr = dma_addr;
pkt->addr[i].dma_length = dma_length;
}
static void *qib_user_sdma_alloc_header(struct qib_user_sdma_queue *pq,
size_t len, dma_addr_t *dma_addr)
{
void *hdr;
if (len == QIB_USER_SDMA_EXP_HEADER_LENGTH)
hdr = dma_pool_alloc(pq->header_cache, GFP_KERNEL,
dma_addr);
else
hdr = NULL;
if (!hdr) {
hdr = kmalloc(len, GFP_KERNEL);
if (!hdr)
return NULL;
*dma_addr = 0;
}
return hdr;
}
static int qib_user_sdma_page_to_frags(const struct qib_devdata *dd,
struct qib_user_sdma_queue *pq,
struct qib_user_sdma_pkt *pkt,
struct page *page, u16 put,
u16 offset, u16 len, void *kvaddr)
{
__le16 *pbc16;
void *pbcvaddr;
struct qib_message_header *hdr;
u16 newlen, pbclen, lastdesc, dma_mapped;
u32 vcto;
union qib_seqnum seqnum;
dma_addr_t pbcdaddr;
dma_addr_t dma_addr =
dma_map_page(&dd->pcidev->dev,
page, offset, len, DMA_TO_DEVICE);
int ret = 0;
if (dma_mapping_error(&dd->pcidev->dev, dma_addr)) {
/*
* dma mapping error, pkt has not managed
* this page yet, return the page here so
* the caller can ignore this page.
*/
if (put) {
unpin_user_page(page);
} else {
/* coalesce case */
kunmap(page);
__free_page(page);
}
ret = -ENOMEM;
goto done;
}
offset = 0;
dma_mapped = 1;
next_fragment:
/*
* In tid-sdma, the transfer length is restricted by
* receiver side current tid page length.
*/
if (pkt->tiddma && len > pkt->tidsm[pkt->tidsmidx].length)
newlen = pkt->tidsm[pkt->tidsmidx].length;
else
newlen = len;
/*
* Then the transfer length is restricted by MTU.
* the last descriptor flag is determined by:
* 1. the current packet is at frag size length.
* 2. the current tid page is done if tid-sdma.
* 3. there is no more byte togo if sdma.
*/
lastdesc = 0;
if ((pkt->payload_size + newlen) >= pkt->frag_size) {
newlen = pkt->frag_size - pkt->payload_size;
lastdesc = 1;
} else if (pkt->tiddma) {
if (newlen == pkt->tidsm[pkt->tidsmidx].length)
lastdesc = 1;
} else {
if (newlen == pkt->bytes_togo)
lastdesc = 1;
}
/* fill the next fragment in this page */
qib_user_sdma_init_frag(pkt, pkt->naddr, /* index */
offset, newlen, /* offset, len */
0, lastdesc, /* first last desc */
put, dma_mapped, /* put page, dma mapped */
page, kvaddr, /* struct page, virt addr */
dma_addr, len); /* dma addr, dma length */
pkt->bytes_togo -= newlen;
pkt->payload_size += newlen;
pkt->naddr++;
if (pkt->naddr == pkt->addrlimit) {
ret = -EFAULT;
goto done;
}
/* If there is no more byte togo. (lastdesc==1) */
if (pkt->bytes_togo == 0) {
/* The packet is done, header is not dma mapped yet.
* it should be from kmalloc */
if (!pkt->addr[pkt->index].addr) {
pkt->addr[pkt->index].addr =
dma_map_single(&dd->pcidev->dev,
pkt->addr[pkt->index].kvaddr,
pkt->addr[pkt->index].dma_length,
DMA_TO_DEVICE);
if (dma_mapping_error(&dd->pcidev->dev,
pkt->addr[pkt->index].addr)) {
ret = -ENOMEM;
goto done;
}
pkt->addr[pkt->index].dma_mapped = 1;
}
goto done;
}
/* If tid-sdma, advance tid info. */
if (pkt->tiddma) {
pkt->tidsm[pkt->tidsmidx].length -= newlen;
if (pkt->tidsm[pkt->tidsmidx].length) {
pkt->tidsm[pkt->tidsmidx].offset += newlen;
} else {
pkt->tidsmidx++;
if (pkt->tidsmidx == pkt->tidsmcount) {
ret = -EFAULT;
goto done;
}
}
}
/*
* If this is NOT the last descriptor. (newlen==len)
* the current packet is not done yet, but the current
* send side page is done.
*/
if (lastdesc == 0)
goto done;
/*
* If running this driver under PSM with message size
* fitting into one transfer unit, it is not possible
* to pass this line. otherwise, it is a buggggg.
*/
/*
* Since the current packet is done, and there are more
* bytes togo, we need to create a new sdma header, copying
* from previous sdma header and modify both.
*/
pbclen = pkt->addr[pkt->index].length;
pbcvaddr = qib_user_sdma_alloc_header(pq, pbclen, &pbcdaddr);
if (!pbcvaddr) {
ret = -ENOMEM;
goto done;
}
/* Copy the previous sdma header to new sdma header */
pbc16 = (__le16 *)pkt->addr[pkt->index].kvaddr;
memcpy(pbcvaddr, pbc16, pbclen);
/* Modify the previous sdma header */
hdr = (struct qib_message_header *)&pbc16[4];
/* New pbc length */
pbc16[0] = cpu_to_le16(le16_to_cpu(pbc16[0])-(pkt->bytes_togo>>2));
/* New packet length */
hdr->lrh[2] = cpu_to_be16(le16_to_cpu(pbc16[0]));
if (pkt->tiddma) {
/* turn on the header suppression */
hdr->iph.pkt_flags =
cpu_to_le16(le16_to_cpu(hdr->iph.pkt_flags)|0x2);
/* turn off ACK_REQ: 0x04 and EXPECTED_DONE: 0x20 */
hdr->flags &= ~(0x04|0x20);
} else {
/* turn off extra bytes: 20-21 bits */
hdr->bth[0] = cpu_to_be32(be32_to_cpu(hdr->bth[0])&0xFFCFFFFF);
/* turn off ACK_REQ: 0x04 */
hdr->flags &= ~(0x04);
}
/* New kdeth checksum */
vcto = le32_to_cpu(hdr->iph.ver_ctxt_tid_offset);
hdr->iph.chksum = cpu_to_le16(QIB_LRH_BTH +
be16_to_cpu(hdr->lrh[2]) -
((vcto>>16)&0xFFFF) - (vcto&0xFFFF) -
le16_to_cpu(hdr->iph.pkt_flags));
/* The packet is done, header is not dma mapped yet.
* it should be from kmalloc */
if (!pkt->addr[pkt->index].addr) {
pkt->addr[pkt->index].addr =
dma_map_single(&dd->pcidev->dev,
pkt->addr[pkt->index].kvaddr,
pkt->addr[pkt->index].dma_length,
DMA_TO_DEVICE);
if (dma_mapping_error(&dd->pcidev->dev,
pkt->addr[pkt->index].addr)) {
ret = -ENOMEM;
goto done;
}
pkt->addr[pkt->index].dma_mapped = 1;
}
/* Modify the new sdma header */
pbc16 = (__le16 *)pbcvaddr;
hdr = (struct qib_message_header *)&pbc16[4];
/* New pbc length */
pbc16[0] = cpu_to_le16(le16_to_cpu(pbc16[0])-(pkt->payload_size>>2));
/* New packet length */
hdr->lrh[2] = cpu_to_be16(le16_to_cpu(pbc16[0]));
if (pkt->tiddma) {
/* Set new tid and offset for new sdma header */
hdr->iph.ver_ctxt_tid_offset = cpu_to_le32(
(le32_to_cpu(hdr->iph.ver_ctxt_tid_offset)&0xFF000000) +
(pkt->tidsm[pkt->tidsmidx].tid<<QLOGIC_IB_I_TID_SHIFT) +
(pkt->tidsm[pkt->tidsmidx].offset>>2));
} else {
/* Middle protocol new packet offset */
hdr->uwords[2] += pkt->payload_size;
}
/* New kdeth checksum */
vcto = le32_to_cpu(hdr->iph.ver_ctxt_tid_offset);
hdr->iph.chksum = cpu_to_le16(QIB_LRH_BTH +
be16_to_cpu(hdr->lrh[2]) -
((vcto>>16)&0xFFFF) - (vcto&0xFFFF) -
le16_to_cpu(hdr->iph.pkt_flags));
/* Next sequence number in new sdma header */
seqnum.val = be32_to_cpu(hdr->bth[2]);
if (pkt->tiddma)
seqnum.seq++;
else
seqnum.pkt++;
hdr->bth[2] = cpu_to_be32(seqnum.val);
/* Init new sdma header. */
qib_user_sdma_init_frag(pkt, pkt->naddr, /* index */
0, pbclen, /* offset, len */
1, 0, /* first last desc */
0, 0, /* put page, dma mapped */
NULL, pbcvaddr, /* struct page, virt addr */
pbcdaddr, pbclen); /* dma addr, dma length */
pkt->index = pkt->naddr;
pkt->payload_size = 0;
pkt->naddr++;
if (pkt->naddr == pkt->addrlimit) {
ret = -EFAULT;
goto done;
}
/* Prepare for next fragment in this page */
if (newlen != len) {
if (dma_mapped) {
put = 0;
dma_mapped = 0;
page = NULL;
kvaddr = NULL;
}
len -= newlen;
offset += newlen;
goto next_fragment;
}
done:
return ret;
}
/* we've too many pages in the iovec, coalesce to a single page */
static int qib_user_sdma_coalesce(const struct qib_devdata *dd,
struct qib_user_sdma_queue *pq,
struct qib_user_sdma_pkt *pkt,
const struct iovec *iov,
unsigned long niov)
{
int ret = 0;
struct page *page = alloc_page(GFP_KERNEL);
void *mpage_save;
char *mpage;
int i;
int len = 0;
if (!page) {
ret = -ENOMEM;
goto done;
}
mpage = kmap(page);
mpage_save = mpage;
for (i = 0; i < niov; i++) {
int cfur;
cfur = copy_from_user(mpage,
iov[i].iov_base, iov[i].iov_len);
if (cfur) {
ret = -EFAULT;
goto free_unmap;
}
mpage += iov[i].iov_len;
len += iov[i].iov_len;
}
ret = qib_user_sdma_page_to_frags(dd, pq, pkt,
page, 0, 0, len, mpage_save);
goto done;
free_unmap:
kunmap(page);
__free_page(page);
done:
return ret;
}
/*
* How many pages in this iovec element?
*/
static size_t qib_user_sdma_num_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 void qib_user_sdma_free_pkt_frag(struct device *dev,
struct qib_user_sdma_queue *pq,
struct qib_user_sdma_pkt *pkt,
int frag)
{
const int i = frag;
if (pkt->addr[i].page) {
/* only user data has page */
if (pkt->addr[i].dma_mapped)
dma_unmap_page(dev,
pkt->addr[i].addr,
pkt->addr[i].dma_length,
DMA_TO_DEVICE);
if (pkt->addr[i].kvaddr)
kunmap(pkt->addr[i].page);
if (pkt->addr[i].put_page)
unpin_user_page(pkt->addr[i].page);
else
__free_page(pkt->addr[i].page);
} else if (pkt->addr[i].kvaddr) {
/* for headers */
if (pkt->addr[i].dma_mapped) {
/* from kmalloc & dma mapped */
dma_unmap_single(dev,
pkt->addr[i].addr,
pkt->addr[i].dma_length,
DMA_TO_DEVICE);
kfree(pkt->addr[i].kvaddr);
} else if (pkt->addr[i].addr) {
/* free coherent mem from cache... */
dma_pool_free(pq->header_cache,
pkt->addr[i].kvaddr, pkt->addr[i].addr);
} else {
/* from kmalloc but not dma mapped */
kfree(pkt->addr[i].kvaddr);
}
}
}
/* return number of pages pinned... */
static int qib_user_sdma_pin_pages(const struct qib_devdata *dd,
struct qib_user_sdma_queue *pq,
struct qib_user_sdma_pkt *pkt,
unsigned long addr, int tlen, size_t npages)
{
struct page *pages[8];
int i, j;
int ret = 0;
while (npages) {
if (npages > 8)
j = 8;
else
j = npages;
ret = pin_user_pages_fast(addr, j, FOLL_LONGTERM, pages);
if (ret != j) {
i = 0;
j = ret;
ret = -ENOMEM;
goto free_pages;
}
for (i = 0; i < j; i++) {
/* map the pages... */
unsigned long fofs = addr & ~PAGE_MASK;
int flen = ((fofs + tlen) > PAGE_SIZE) ?
(PAGE_SIZE - fofs) : tlen;
ret = qib_user_sdma_page_to_frags(dd, pq, pkt,
pages[i], 1, fofs, flen, NULL);
if (ret < 0) {
/* current page has beed taken
* care of inside above call.
*/
i++;
goto free_pages;
}
addr += flen;
tlen -= flen;
}
npages -= j;
}
goto done;
/* if error, return all pages not managed by pkt */
free_pages:
while (i < j)
unpin_user_page(pages[i++]);
done:
return ret;
}
static int qib_user_sdma_pin_pkt(const struct qib_devdata *dd,
struct qib_user_sdma_queue *pq,
struct qib_user_sdma_pkt *pkt,
const struct iovec *iov,
unsigned long niov)
{
int ret = 0;
unsigned long idx;
for (idx = 0; idx < niov; idx++) {
const size_t npages = qib_user_sdma_num_pages(iov + idx);
const unsigned long addr = (unsigned long) iov[idx].iov_base;
ret = qib_user_sdma_pin_pages(dd, pq, pkt, addr,
iov[idx].iov_len, npages);
if (ret < 0)
goto free_pkt;
}
goto done;
free_pkt:
/* we need to ignore the first entry here */
for (idx = 1; idx < pkt->naddr; idx++)
qib_user_sdma_free_pkt_frag(&dd->pcidev->dev, pq, pkt, idx);
/* need to dma unmap the first entry, this is to restore to
* the original state so that caller can free the memory in
* error condition. Caller does not know if dma mapped or not*/
if (pkt->addr[0].dma_mapped) {
dma_unmap_single(&dd->pcidev->dev,
pkt->addr[0].addr,
pkt->addr[0].dma_length,
DMA_TO_DEVICE);
pkt->addr[0].addr = 0;
pkt->addr[0].dma_mapped = 0;
}
done:
return ret;
}
static int qib_user_sdma_init_payload(const struct qib_devdata *dd,
struct qib_user_sdma_queue *pq,
struct qib_user_sdma_pkt *pkt,
const struct iovec *iov,
unsigned long niov, int npages)
{
int ret = 0;
if (pkt->frag_size == pkt->bytes_togo &&
npages >= ARRAY_SIZE(pkt->addr))
ret = qib_user_sdma_coalesce(dd, pq, pkt, iov, niov);
else
ret = qib_user_sdma_pin_pkt(dd, pq, pkt, iov, niov);
return ret;
}
/* free a packet list -- return counter value of last packet */
static void qib_user_sdma_free_pkt_list(struct device *dev,
struct qib_user_sdma_queue *pq,
struct list_head *list)
{
struct qib_user_sdma_pkt *pkt, *pkt_next;
list_for_each_entry_safe(pkt, pkt_next, list, list) {
int i;
for (i = 0; i < pkt->naddr; i++)
qib_user_sdma_free_pkt_frag(dev, pq, pkt, i);
if (pkt->largepkt)
kfree(pkt);
else
kmem_cache_free(pq->pkt_slab, pkt);
}
INIT_LIST_HEAD(list);
}
/*
* copy headers, coalesce etc -- pq->lock must be held
*
* we queue all the packets to list, returning the
* number of bytes total. list must be empty initially,
* as, if there is an error we clean it...
*/
static int qib_user_sdma_queue_pkts(const struct qib_devdata *dd,
struct qib_pportdata *ppd,
struct qib_user_sdma_queue *pq,
const struct iovec *iov,
unsigned long niov,
struct list_head *list,
int *maxpkts, int *ndesc)
{
unsigned long idx = 0;
int ret = 0;
int npkts = 0;
__le32 *pbc;
dma_addr_t dma_addr;
struct qib_user_sdma_pkt *pkt = NULL;
size_t len;
size_t nw;
u32 counter = pq->counter;
u16 frag_size;
while (idx < niov && npkts < *maxpkts) {
const unsigned long addr = (unsigned long) iov[idx].iov_base;
const unsigned long idx_save = idx;
unsigned pktnw;
unsigned pktnwc;
int nfrags = 0;
size_t npages = 0;
size_t bytes_togo = 0;
int tiddma = 0;
int cfur;
len = iov[idx].iov_len;
nw = len >> 2;
if (len < QIB_USER_SDMA_MIN_HEADER_LENGTH ||
len > PAGE_SIZE || len & 3 || addr & 3) {
ret = -EINVAL;
goto free_list;
}
pbc = qib_user_sdma_alloc_header(pq, len, &dma_addr);
if (!pbc) {
ret = -ENOMEM;
goto free_list;
}
cfur = copy_from_user(pbc, iov[idx].iov_base, len);
if (cfur) {
ret = -EFAULT;
goto free_pbc;
}
/*
* This assignment is a bit strange. it's because
* the pbc counts the number of 32 bit words in the full
* packet _except_ the first word of the pbc itself...
*/
pktnwc = nw - 1;
/*
* pktnw computation yields the number of 32 bit words
* that the caller has indicated in the PBC. note that
* this is one less than the total number of words that
* goes to the send DMA engine as the first 32 bit word
* of the PBC itself is not counted. Armed with this count,
* we can verify that the packet is consistent with the
* iovec lengths.
*/
pktnw = le32_to_cpu(*pbc) & 0xFFFF;
if (pktnw < pktnwc) {
ret = -EINVAL;
goto free_pbc;
}
idx++;
while (pktnwc < pktnw && idx < niov) {
const size_t slen = iov[idx].iov_len;
const unsigned long faddr =
(unsigned long) iov[idx].iov_base;
if (slen & 3 || faddr & 3 || !slen) {
ret = -EINVAL;
goto free_pbc;
}
npages += qib_user_sdma_num_pages(&iov[idx]);
if (check_add_overflow(bytes_togo, slen, &bytes_togo) ||
bytes_togo > type_max(typeof(pkt->bytes_togo))) {
ret = -EINVAL;
goto free_pbc;
}
pktnwc += slen >> 2;
idx++;
nfrags++;
}
if (pktnwc != pktnw) {
ret = -EINVAL;
goto free_pbc;
}
frag_size = ((le32_to_cpu(*pbc))>>16) & 0xFFFF;
if (((frag_size ? frag_size : bytes_togo) + len) >
ppd->ibmaxlen) {
ret = -EINVAL;
goto free_pbc;
}
if (frag_size) {
size_t tidsmsize, n, pktsize, sz, addrlimit;
n = npages*((2*PAGE_SIZE/frag_size)+1);
pktsize = struct_size(pkt, addr, n);
/*
* Determine if this is tid-sdma or just sdma.
*/
tiddma = (((le32_to_cpu(pbc[7])>>
QLOGIC_IB_I_TID_SHIFT)&
QLOGIC_IB_I_TID_MASK) !=
QLOGIC_IB_I_TID_MASK);
if (tiddma)
tidsmsize = iov[idx].iov_len;
else
tidsmsize = 0;
if (check_add_overflow(pktsize, tidsmsize, &sz)) {
ret = -EINVAL;
goto free_pbc;
}
pkt = kmalloc(sz, GFP_KERNEL);
if (!pkt) {
ret = -ENOMEM;
goto free_pbc;
}
pkt->largepkt = 1;
pkt->frag_size = frag_size;
if (check_add_overflow(n, ARRAY_SIZE(pkt->addr),
&addrlimit) ||
addrlimit > type_max(typeof(pkt->addrlimit))) {
ret = -EINVAL;
goto free_pkt;
}
pkt->addrlimit = addrlimit;
if (tiddma) {
char *tidsm = (char *)pkt + pktsize;
cfur = copy_from_user(tidsm,
iov[idx].iov_base, tidsmsize);
if (cfur) {
ret = -EFAULT;
goto free_pkt;
}
pkt->tidsm =
(struct qib_tid_session_member *)tidsm;
pkt->tidsmcount = tidsmsize/
sizeof(struct qib_tid_session_member);
pkt->tidsmidx = 0;
idx++;
}
/*
* pbc 'fill1' field is borrowed to pass frag size,
* we need to clear it after picking frag size, the
* hardware requires this field to be zero.
*/
*pbc = cpu_to_le32(le32_to_cpu(*pbc) & 0x0000FFFF);
} else {
pkt = kmem_cache_alloc(pq->pkt_slab, GFP_KERNEL);
if (!pkt) {
ret = -ENOMEM;
goto free_pbc;
}
pkt->largepkt = 0;
pkt->frag_size = bytes_togo;
pkt->addrlimit = ARRAY_SIZE(pkt->addr);
}
pkt->bytes_togo = bytes_togo;
pkt->payload_size = 0;
pkt->counter = counter;
pkt->tiddma = tiddma;
/* setup the first header */
qib_user_sdma_init_frag(pkt, 0, /* index */
0, len, /* offset, len */
1, 0, /* first last desc */
0, 0, /* put page, dma mapped */
NULL, pbc, /* struct page, virt addr */
dma_addr, len); /* dma addr, dma length */
pkt->index = 0;
pkt->naddr = 1;
if (nfrags) {
ret = qib_user_sdma_init_payload(dd, pq, pkt,
iov + idx_save + 1,
nfrags, npages);
if (ret < 0)
goto free_pkt;
} else {
/* since there is no payload, mark the
* header as the last desc. */
pkt->addr[0].last_desc = 1;
if (dma_addr == 0) {
/*
* the header is not dma mapped yet.
* it should be from kmalloc.
*/
dma_addr = dma_map_single(&dd->pcidev->dev,
pbc, len, DMA_TO_DEVICE);
if (dma_mapping_error(&dd->pcidev->dev,
dma_addr)) {
ret = -ENOMEM;
goto free_pkt;
}
pkt->addr[0].addr = dma_addr;
pkt->addr[0].dma_mapped = 1;
}
}
counter++;
npkts++;
pkt->pq = pq;
pkt->index = 0; /* reset index for push on hw */
*ndesc += pkt->naddr;
list_add_tail(&pkt->list, list);
}
*maxpkts = npkts;
ret = idx;
goto done;
free_pkt:
if (pkt->largepkt)
kfree(pkt);
else
kmem_cache_free(pq->pkt_slab, pkt);
free_pbc:
if (dma_addr)
dma_pool_free(pq->header_cache, pbc, dma_addr);
else
kfree(pbc);
free_list:
qib_user_sdma_free_pkt_list(&dd->pcidev->dev, pq, list);
done:
return ret;
}
static void qib_user_sdma_set_complete_counter(struct qib_user_sdma_queue *pq,
u32 c)
{
pq->sent_counter = c;
}
/* try to clean out queue -- needs pq->lock */
static int qib_user_sdma_queue_clean(struct qib_pportdata *ppd,
struct qib_user_sdma_queue *pq)
{
struct qib_devdata *dd = ppd->dd;
struct list_head free_list;
struct qib_user_sdma_pkt *pkt;
struct qib_user_sdma_pkt *pkt_prev;
unsigned long flags;
int ret = 0;
if (!pq->num_sending)
return 0;
INIT_LIST_HEAD(&free_list);
/*
* We need this spin lock here because interrupt handler
* might modify this list in qib_user_sdma_send_desc(), also
* we can not get interrupted, otherwise it is a deadlock.
*/
spin_lock_irqsave(&pq->sent_lock, flags);
list_for_each_entry_safe(pkt, pkt_prev, &pq->sent, list) {
s64 descd = ppd->sdma_descq_removed - pkt->added;
if (descd < 0)
break;
list_move_tail(&pkt->list, &free_list);
/* one more packet cleaned */
ret++;
pq->num_sending--;
}
spin_unlock_irqrestore(&pq->sent_lock, flags);
if (!list_empty(&free_list)) {
u32 counter;
pkt = list_entry(free_list.prev,
struct qib_user_sdma_pkt, list);
counter = pkt->counter;
qib_user_sdma_free_pkt_list(&dd->pcidev->dev, pq, &free_list);
qib_user_sdma_set_complete_counter(pq, counter);
}
return ret;
}
void qib_user_sdma_queue_destroy(struct qib_user_sdma_queue *pq)
{
if (!pq)
return;
pq->sdma_rb_node->refcount--;
if (pq->sdma_rb_node->refcount == 0) {
rb_erase(&pq->sdma_rb_node->node, &qib_user_sdma_rb_root);
kfree(pq->sdma_rb_node);
}
dma_pool_destroy(pq->header_cache);
kmem_cache_destroy(pq->pkt_slab);
kfree(pq);
}
/* clean descriptor queue, returns > 0 if some elements cleaned */
static int qib_user_sdma_hwqueue_clean(struct qib_pportdata *ppd)
{
int ret;
unsigned long flags;
spin_lock_irqsave(&ppd->sdma_lock, flags);
ret = qib_sdma_make_progress(ppd);
spin_unlock_irqrestore(&ppd->sdma_lock, flags);
return ret;
}
/* we're in close, drain packets so that we can cleanup successfully... */
void qib_user_sdma_queue_drain(struct qib_pportdata *ppd,
struct qib_user_sdma_queue *pq)
{
struct qib_devdata *dd = ppd->dd;
unsigned long flags;
int i;
if (!pq)
return;
for (i = 0; i < QIB_USER_SDMA_DRAIN_TIMEOUT; i++) {
mutex_lock(&pq->lock);
if (!pq->num_pending && !pq->num_sending) {
mutex_unlock(&pq->lock);
break;
}
qib_user_sdma_hwqueue_clean(ppd);
qib_user_sdma_queue_clean(ppd, pq);
mutex_unlock(&pq->lock);
msleep(20);
}
if (pq->num_pending || pq->num_sending) {
struct qib_user_sdma_pkt *pkt;
struct qib_user_sdma_pkt *pkt_prev;
struct list_head free_list;
mutex_lock(&pq->lock);
spin_lock_irqsave(&ppd->sdma_lock, flags);
/*
* Since we hold sdma_lock, it is safe without sent_lock.
*/
if (pq->num_pending) {
list_for_each_entry_safe(pkt, pkt_prev,
&ppd->sdma_userpending, list) {
if (pkt->pq == pq) {
list_move_tail(&pkt->list, &pq->sent);
pq->num_pending--;
pq->num_sending++;
}
}
}
spin_unlock_irqrestore(&ppd->sdma_lock, flags);
qib_dev_err(dd, "user sdma lists not empty: forcing!\n");
INIT_LIST_HEAD(&free_list);
list_splice_init(&pq->sent, &free_list);
pq->num_sending = 0;
qib_user_sdma_free_pkt_list(&dd->pcidev->dev, pq, &free_list);
mutex_unlock(&pq->lock);
}
}
static inline __le64 qib_sdma_make_desc0(u8 gen,
u64 addr, u64 dwlen, u64 dwoffset)
{
return cpu_to_le64(/* SDmaPhyAddr[31:0] */
((addr & 0xfffffffcULL) << 32) |
/* SDmaGeneration[1:0] */
((gen & 3ULL) << 30) |
/* SDmaDwordCount[10:0] */
((dwlen & 0x7ffULL) << 16) |
/* SDmaBufOffset[12:2] */
(dwoffset & 0x7ffULL));
}
static inline __le64 qib_sdma_make_first_desc0(__le64 descq)
{
return descq | cpu_to_le64(1ULL << 12);
}
static inline __le64 qib_sdma_make_last_desc0(__le64 descq)
{
/* last */ /* dma head */
return descq | cpu_to_le64(1ULL << 11 | 1ULL << 13);
}
static inline __le64 qib_sdma_make_desc1(u64 addr)
{
/* SDmaPhyAddr[47:32] */
return cpu_to_le64(addr >> 32);
}
static void qib_user_sdma_send_frag(struct qib_pportdata *ppd,
struct qib_user_sdma_pkt *pkt, int idx,
unsigned ofs, u16 tail, u8 gen)
{
const u64 addr = (u64) pkt->addr[idx].addr +
(u64) pkt->addr[idx].offset;
const u64 dwlen = (u64) pkt->addr[idx].length / 4;
__le64 *descqp;
__le64 descq0;
descqp = &ppd->sdma_descq[tail].qw[0];
descq0 = qib_sdma_make_desc0(gen, addr, dwlen, ofs);
if (pkt->addr[idx].first_desc)
descq0 = qib_sdma_make_first_desc0(descq0);
if (pkt->addr[idx].last_desc) {
descq0 = qib_sdma_make_last_desc0(descq0);
if (ppd->sdma_intrequest) {
descq0 |= cpu_to_le64(1ULL << 15);
ppd->sdma_intrequest = 0;
}
}
descqp[0] = descq0;
descqp[1] = qib_sdma_make_desc1(addr);
}
void qib_user_sdma_send_desc(struct qib_pportdata *ppd,
struct list_head *pktlist)
{
struct qib_devdata *dd = ppd->dd;
u16 nfree, nsent;
u16 tail, tail_c;
u8 gen, gen_c;
nfree = qib_sdma_descq_freecnt(ppd);
if (!nfree)
return;
retry:
nsent = 0;
tail_c = tail = ppd->sdma_descq_tail;
gen_c = gen = ppd->sdma_generation;
while (!list_empty(pktlist)) {
struct qib_user_sdma_pkt *pkt =
list_entry(pktlist->next, struct qib_user_sdma_pkt,
list);
int i, j, c = 0;
unsigned ofs = 0;
u16 dtail = tail;
for (i = pkt->index; i < pkt->naddr && nfree; i++) {
qib_user_sdma_send_frag(ppd, pkt, i, ofs, tail, gen);
ofs += pkt->addr[i].length >> 2;
if (++tail == ppd->sdma_descq_cnt) {
tail = 0;
++gen;
ppd->sdma_intrequest = 1;
} else if (tail == (ppd->sdma_descq_cnt>>1)) {
ppd->sdma_intrequest = 1;
}
nfree--;
if (pkt->addr[i].last_desc == 0)
continue;
/*
* If the packet is >= 2KB mtu equivalent, we
* have to use the large buffers, and have to
* mark each descriptor as part of a large
* buffer packet.
*/
if (ofs > dd->piosize2kmax_dwords) {
for (j = pkt->index; j <= i; j++) {
ppd->sdma_descq[dtail].qw[0] |=
cpu_to_le64(1ULL << 14);
if (++dtail == ppd->sdma_descq_cnt)
dtail = 0;
}
}
c += i + 1 - pkt->index;
pkt->index = i + 1; /* index for next first */
tail_c = dtail = tail;
gen_c = gen;
ofs = 0; /* reset for next packet */
}
ppd->sdma_descq_added += c;
nsent += c;
if (pkt->index == pkt->naddr) {
pkt->added = ppd->sdma_descq_added;
pkt->pq->added = pkt->added;
pkt->pq->num_pending--;
spin_lock(&pkt->pq->sent_lock);
pkt->pq->num_sending++;
list_move_tail(&pkt->list, &pkt->pq->sent);
spin_unlock(&pkt->pq->sent_lock);
}
if (!nfree || (nsent<<2) > ppd->sdma_descq_cnt)
break;
}
/* advance the tail on the chip if necessary */
if (ppd->sdma_descq_tail != tail_c) {
ppd->sdma_generation = gen_c;
dd->f_sdma_update_tail(ppd, tail_c);
}
if (nfree && !list_empty(pktlist))
goto retry;
}
/* pq->lock must be held, get packets on the wire... */
static int qib_user_sdma_push_pkts(struct qib_pportdata *ppd,
struct qib_user_sdma_queue *pq,
struct list_head *pktlist, int count)
{
unsigned long flags;
if (unlikely(!(ppd->lflags & QIBL_LINKACTIVE)))
return -ECOMM;
/* non-blocking mode */
if (pq->sdma_rb_node->refcount > 1) {
spin_lock_irqsave(&ppd->sdma_lock, flags);
if (unlikely(!__qib_sdma_running(ppd))) {
spin_unlock_irqrestore(&ppd->sdma_lock, flags);
return -ECOMM;
}
pq->num_pending += count;
list_splice_tail_init(pktlist, &ppd->sdma_userpending);
qib_user_sdma_send_desc(ppd, &ppd->sdma_userpending);
spin_unlock_irqrestore(&ppd->sdma_lock, flags);
return 0;
}
/* In this case, descriptors from this process are not
* linked to ppd pending queue, interrupt handler
* won't update this process, it is OK to directly
* modify without sdma lock.
*/
pq->num_pending += count;
/*
* Blocking mode for single rail process, we must
* release/regain sdma_lock to give other process
* chance to make progress. This is important for
* performance.
*/
do {
spin_lock_irqsave(&ppd->sdma_lock, flags);
if (unlikely(!__qib_sdma_running(ppd))) {
spin_unlock_irqrestore(&ppd->sdma_lock, flags);
return -ECOMM;
}
qib_user_sdma_send_desc(ppd, pktlist);
if (!list_empty(pktlist))
qib_sdma_make_progress(ppd);
spin_unlock_irqrestore(&ppd->sdma_lock, flags);
} while (!list_empty(pktlist));
return 0;
}
int qib_user_sdma_writev(struct qib_ctxtdata *rcd,
struct qib_user_sdma_queue *pq,
const struct iovec *iov,
unsigned long dim)
{
struct qib_devdata *dd = rcd->dd;
struct qib_pportdata *ppd = rcd->ppd;
int ret = 0;
struct list_head list;
int npkts = 0;
INIT_LIST_HEAD(&list);
mutex_lock(&pq->lock);
/* why not -ECOMM like qib_user_sdma_push_pkts() below? */
if (!qib_sdma_running(ppd))
goto done_unlock;
/* if I have packets not complete yet */
if (pq->added > ppd->sdma_descq_removed)
qib_user_sdma_hwqueue_clean(ppd);
/* if I have complete packets to be freed */
if (pq->num_sending)
qib_user_sdma_queue_clean(ppd, pq);
while (dim) {
int mxp = 1;
int ndesc = 0;
ret = qib_user_sdma_queue_pkts(dd, ppd, pq,
iov, dim, &list, &mxp, &ndesc);
if (ret < 0)
goto done_unlock;
else {
dim -= ret;
iov += ret;
}
/* force packets onto the sdma hw queue... */
if (!list_empty(&list)) {
/*
* Lazily clean hw queue.
*/
if (qib_sdma_descq_freecnt(ppd) < ndesc) {
qib_user_sdma_hwqueue_clean(ppd);
if (pq->num_sending)
qib_user_sdma_queue_clean(ppd, pq);
}
ret = qib_user_sdma_push_pkts(ppd, pq, &list, mxp);
if (ret < 0)
goto done_unlock;
else {
npkts += mxp;
pq->counter += mxp;
}
}
}
done_unlock:
if (!list_empty(&list))
qib_user_sdma_free_pkt_list(&dd->pcidev->dev, pq, &list);
mutex_unlock(&pq->lock);
return (ret < 0) ? ret : npkts;
}
int qib_user_sdma_make_progress(struct qib_pportdata *ppd,
struct qib_user_sdma_queue *pq)
{
int ret = 0;
mutex_lock(&pq->lock);
qib_user_sdma_hwqueue_clean(ppd);
ret = qib_user_sdma_queue_clean(ppd, pq);
mutex_unlock(&pq->lock);
return ret;
}
u32 qib_user_sdma_complete_counter(const struct qib_user_sdma_queue *pq)
{
return pq ? pq->sent_counter : 0;
}
u32 qib_user_sdma_inflight_counter(struct qib_user_sdma_queue *pq)
{
return pq ? pq->counter : 0;
}