diff options
Diffstat (limited to 'drivers/staging/rdma/ipath/ipath_user_sdma.c')
| -rw-r--r-- | drivers/staging/rdma/ipath/ipath_user_sdma.c | 874 |
1 files changed, 0 insertions, 874 deletions
diff --git a/drivers/staging/rdma/ipath/ipath_user_sdma.c b/drivers/staging/rdma/ipath/ipath_user_sdma.c deleted file mode 100644 index 8c12e3cccc58..000000000000 --- a/drivers/staging/rdma/ipath/ipath_user_sdma.c +++ /dev/null @@ -1,874 +0,0 @@ -/* - * Copyright (c) 2007, 2008 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 "ipath_kernel.h" -#include "ipath_user_sdma.h" - -/* minimum size of header */ -#define IPATH_USER_SDMA_MIN_HEADER_LENGTH 64 -/* expected size of headers (for dma_pool) */ -#define IPATH_USER_SDMA_EXP_HEADER_LENGTH 64 -/* length mask in PBC (lower 11 bits) */ -#define IPATH_PBC_LENGTH_MASK ((1 << 11) - 1) - -struct ipath_user_sdma_pkt { - u8 naddr; /* dimension of addr (1..3) ... */ - u32 counter; /* sdma pkts queued counter for this entry */ - u64 added; /* global descq number of entries */ - - struct { - u32 offset; /* offset for kvaddr, addr */ - u32 length; /* length in page */ - u8 put_page; /* should we put_page? */ - u8 dma_mapped; /* is page dma_mapped? */ - 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 list_head list; /* list element */ -}; - -struct ipath_user_sdma_queue { - /* - * pkts sent to dma engine are queued on this - * list head. the type of the elements of this - * list are struct ipath_user_sdma_pkt... - */ - struct list_head sent; - - /* 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; - - /* dma page table */ - struct rb_root dma_pages_root; - - /* protect everything above... */ - struct mutex lock; -}; - -struct ipath_user_sdma_queue * -ipath_user_sdma_queue_create(struct device *dev, int unit, int port, int sport) -{ - struct ipath_user_sdma_queue *pq = - kmalloc(sizeof(struct ipath_user_sdma_queue), GFP_KERNEL); - - if (!pq) - goto done; - - pq->counter = 0; - pq->sent_counter = 0; - INIT_LIST_HEAD(&pq->sent); - - mutex_init(&pq->lock); - - snprintf(pq->pkt_slab_name, sizeof(pq->pkt_slab_name), - "ipath-user-sdma-pkts-%u-%02u.%02u", unit, port, sport); - pq->pkt_slab = kmem_cache_create(pq->pkt_slab_name, - sizeof(struct ipath_user_sdma_pkt), - 0, 0, NULL); - - if (!pq->pkt_slab) - goto err_kfree; - - snprintf(pq->header_cache_name, sizeof(pq->header_cache_name), - "ipath-user-sdma-headers-%u-%02u.%02u", unit, port, sport); - pq->header_cache = dma_pool_create(pq->header_cache_name, - dev, - IPATH_USER_SDMA_EXP_HEADER_LENGTH, - 4, 0); - if (!pq->header_cache) - goto err_slab; - - pq->dma_pages_root = RB_ROOT; - - goto done; - -err_slab: - kmem_cache_destroy(pq->pkt_slab); -err_kfree: - kfree(pq); - pq = NULL; - -done: - return pq; -} - -static void ipath_user_sdma_init_frag(struct ipath_user_sdma_pkt *pkt, - int i, size_t offset, size_t len, - int put_page, int dma_mapped, - struct page *page, - void *kvaddr, dma_addr_t dma_addr) -{ - pkt->addr[i].offset = offset; - pkt->addr[i].length = len; - 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; -} - -static void ipath_user_sdma_init_header(struct ipath_user_sdma_pkt *pkt, - u32 counter, size_t offset, - size_t len, int dma_mapped, - struct page *page, - void *kvaddr, dma_addr_t dma_addr) -{ - pkt->naddr = 1; - pkt->counter = counter; - ipath_user_sdma_init_frag(pkt, 0, offset, len, 0, dma_mapped, page, - kvaddr, dma_addr); -} - -/* we've too many pages in the iovec, coalesce to a single page */ -static int ipath_user_sdma_coalesce(const struct ipath_devdata *dd, - struct ipath_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; - dma_addr_t dma_addr; - - 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; - } - - dma_addr = dma_map_page(&dd->pcidev->dev, page, 0, len, - DMA_TO_DEVICE); - if (dma_mapping_error(&dd->pcidev->dev, dma_addr)) { - ret = -ENOMEM; - goto free_unmap; - } - - ipath_user_sdma_init_frag(pkt, 1, 0, len, 0, 1, page, mpage_save, - dma_addr); - pkt->naddr = 2; - - goto done; - -free_unmap: - kunmap(page); - __free_page(page); -done: - return ret; -} - -/* how many pages in this iovec element? */ -static int ipath_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); -} - -/* truncate length to page boundary */ -static int ipath_user_sdma_page_length(unsigned long addr, unsigned long len) -{ - const unsigned long offset = offset_in_page(addr); - - return ((offset + len) > PAGE_SIZE) ? (PAGE_SIZE - offset) : len; -} - -static void ipath_user_sdma_free_pkt_frag(struct device *dev, - struct ipath_user_sdma_queue *pq, - struct ipath_user_sdma_pkt *pkt, - int frag) -{ - const int i = frag; - - if (pkt->addr[i].page) { - if (pkt->addr[i].dma_mapped) - dma_unmap_page(dev, - pkt->addr[i].addr, - pkt->addr[i].length, - DMA_TO_DEVICE); - - if (pkt->addr[i].kvaddr) - kunmap(pkt->addr[i].page); - - if (pkt->addr[i].put_page) - put_page(pkt->addr[i].page); - else - __free_page(pkt->addr[i].page); - } else if (pkt->addr[i].kvaddr) - /* free coherent mem from cache... */ - dma_pool_free(pq->header_cache, - pkt->addr[i].kvaddr, pkt->addr[i].addr); -} - -/* return number of pages pinned... */ -static int ipath_user_sdma_pin_pages(const struct ipath_devdata *dd, - struct ipath_user_sdma_pkt *pkt, - unsigned long addr, int tlen, int npages) -{ - struct page *pages[2]; - int j; - int ret; - - ret = get_user_pages_fast(addr, npages, 0, pages); - if (ret != npages) { - int i; - - for (i = 0; i < ret; i++) - put_page(pages[i]); - - ret = -ENOMEM; - goto done; - } - - for (j = 0; j < npages; j++) { - /* map the pages... */ - const int flen = - ipath_user_sdma_page_length(addr, tlen); - dma_addr_t dma_addr = - dma_map_page(&dd->pcidev->dev, - pages[j], 0, flen, DMA_TO_DEVICE); - unsigned long fofs = offset_in_page(addr); - - if (dma_mapping_error(&dd->pcidev->dev, dma_addr)) { - ret = -ENOMEM; - goto done; - } - - ipath_user_sdma_init_frag(pkt, pkt->naddr, fofs, flen, 1, 1, - pages[j], kmap(pages[j]), - dma_addr); - - pkt->naddr++; - addr += flen; - tlen -= flen; - } - -done: - return ret; -} - -static int ipath_user_sdma_pin_pkt(const struct ipath_devdata *dd, - struct ipath_user_sdma_queue *pq, - struct ipath_user_sdma_pkt *pkt, - const struct iovec *iov, - unsigned long niov) -{ - int ret = 0; - unsigned long idx; - - for (idx = 0; idx < niov; idx++) { - const int npages = ipath_user_sdma_num_pages(iov + idx); - const unsigned long addr = (unsigned long) iov[idx].iov_base; - - ret = ipath_user_sdma_pin_pages(dd, pkt, - addr, iov[idx].iov_len, - npages); - if (ret < 0) - goto free_pkt; - } - - goto done; - -free_pkt: - for (idx = 0; idx < pkt->naddr; idx++) - ipath_user_sdma_free_pkt_frag(&dd->pcidev->dev, pq, pkt, idx); - -done: - return ret; -} - -static int ipath_user_sdma_init_payload(const struct ipath_devdata *dd, - struct ipath_user_sdma_queue *pq, - struct ipath_user_sdma_pkt *pkt, - const struct iovec *iov, - unsigned long niov, int npages) -{ - int ret = 0; - - if (npages >= ARRAY_SIZE(pkt->addr)) - ret = ipath_user_sdma_coalesce(dd, pkt, iov, niov); - else - ret = ipath_user_sdma_pin_pkt(dd, pq, pkt, iov, niov); - - return ret; -} - -/* free a packet list -- return counter value of last packet */ -static void ipath_user_sdma_free_pkt_list(struct device *dev, - struct ipath_user_sdma_queue *pq, - struct list_head *list) -{ - struct ipath_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++) - ipath_user_sdma_free_pkt_frag(dev, pq, pkt, i); - - kmem_cache_free(pq->pkt_slab, pkt); - } -} - -/* - * 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 ipath_user_sdma_queue_pkts(const struct ipath_devdata *dd, - struct ipath_user_sdma_queue *pq, - struct list_head *list, - const struct iovec *iov, - unsigned long niov, - int maxpkts) -{ - unsigned long idx = 0; - int ret = 0; - int npkts = 0; - struct page *page = NULL; - __le32 *pbc; - dma_addr_t dma_addr; - struct ipath_user_sdma_pkt *pkt = NULL; - size_t len; - size_t nw; - u32 counter = pq->counter; - int dma_mapped = 0; - - 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; - int npages = 0; - int cfur; - - dma_mapped = 0; - len = iov[idx].iov_len; - nw = len >> 2; - page = NULL; - - pkt = kmem_cache_alloc(pq->pkt_slab, GFP_KERNEL); - if (!pkt) { - ret = -ENOMEM; - goto free_list; - } - - if (len < IPATH_USER_SDMA_MIN_HEADER_LENGTH || - len > PAGE_SIZE || len & 3 || addr & 3) { - ret = -EINVAL; - goto free_pkt; - } - - if (len == IPATH_USER_SDMA_EXP_HEADER_LENGTH) - pbc = dma_pool_alloc(pq->header_cache, GFP_KERNEL, - &dma_addr); - else - pbc = NULL; - - if (!pbc) { - page = alloc_page(GFP_KERNEL); - if (!page) { - ret = -ENOMEM; - goto free_pkt; - } - pbc = kmap(page); - } - - 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 - * 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) & IPATH_PBC_LENGTH_MASK; - if (pktnw < pktnwc || pktnw > pktnwc + (PAGE_SIZE >> 2)) { - 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 || - slen > PAGE_SIZE) { - ret = -EINVAL; - goto free_pbc; - } - - npages++; - if ((faddr & PAGE_MASK) != - ((faddr + slen - 1) & PAGE_MASK)) - npages++; - - pktnwc += slen >> 2; - idx++; - nfrags++; - } - - if (pktnwc != pktnw) { - ret = -EINVAL; - goto free_pbc; - } - - if (page) { - dma_addr = dma_map_page(&dd->pcidev->dev, - page, 0, len, DMA_TO_DEVICE); - if (dma_mapping_error(&dd->pcidev->dev, dma_addr)) { - ret = -ENOMEM; - goto free_pbc; - } - - dma_mapped = 1; - } - - ipath_user_sdma_init_header(pkt, counter, 0, len, dma_mapped, - page, pbc, dma_addr); - - if (nfrags) { - ret = ipath_user_sdma_init_payload(dd, pq, pkt, - iov + idx_save + 1, - nfrags, npages); - if (ret < 0) - goto free_pbc_dma; - } - - counter++; - npkts++; - - list_add_tail(&pkt->list, list); - } - - ret = idx; - goto done; - -free_pbc_dma: - if (dma_mapped) - dma_unmap_page(&dd->pcidev->dev, dma_addr, len, DMA_TO_DEVICE); -free_pbc: - if (page) { - kunmap(page); - __free_page(page); - } else - dma_pool_free(pq->header_cache, pbc, dma_addr); -free_pkt: - kmem_cache_free(pq->pkt_slab, pkt); -free_list: - ipath_user_sdma_free_pkt_list(&dd->pcidev->dev, pq, list); -done: - return ret; -} - -static void ipath_user_sdma_set_complete_counter(struct ipath_user_sdma_queue *pq, - u32 c) -{ - pq->sent_counter = c; -} - -/* try to clean out queue -- needs pq->lock */ -static int ipath_user_sdma_queue_clean(const struct ipath_devdata *dd, - struct ipath_user_sdma_queue *pq) -{ - struct list_head free_list; - struct ipath_user_sdma_pkt *pkt; - struct ipath_user_sdma_pkt *pkt_prev; - int ret = 0; - - INIT_LIST_HEAD(&free_list); - - list_for_each_entry_safe(pkt, pkt_prev, &pq->sent, list) { - s64 descd = dd->ipath_sdma_descq_removed - pkt->added; - - if (descd < 0) - break; - - list_move_tail(&pkt->list, &free_list); - - /* one more packet cleaned */ - ret++; - } - - if (!list_empty(&free_list)) { - u32 counter; - - pkt = list_entry(free_list.prev, - struct ipath_user_sdma_pkt, list); - counter = pkt->counter; - - ipath_user_sdma_free_pkt_list(&dd->pcidev->dev, pq, &free_list); - ipath_user_sdma_set_complete_counter(pq, counter); - } - - return ret; -} - -void ipath_user_sdma_queue_destroy(struct ipath_user_sdma_queue *pq) -{ - if (!pq) - return; - - kmem_cache_destroy(pq->pkt_slab); - dma_pool_destroy(pq->header_cache); - kfree(pq); -} - -/* clean descriptor queue, returns > 0 if some elements cleaned */ -static int ipath_user_sdma_hwqueue_clean(struct ipath_devdata *dd) -{ - int ret; - unsigned long flags; - - spin_lock_irqsave(&dd->ipath_sdma_lock, flags); - ret = ipath_sdma_make_progress(dd); - spin_unlock_irqrestore(&dd->ipath_sdma_lock, flags); - - return ret; -} - -/* we're in close, drain packets so that we can cleanup successfully... */ -void ipath_user_sdma_queue_drain(struct ipath_devdata *dd, - struct ipath_user_sdma_queue *pq) -{ - int i; - - if (!pq) - return; - - for (i = 0; i < 100; i++) { - mutex_lock(&pq->lock); - if (list_empty(&pq->sent)) { - mutex_unlock(&pq->lock); - break; - } - ipath_user_sdma_hwqueue_clean(dd); - ipath_user_sdma_queue_clean(dd, pq); - mutex_unlock(&pq->lock); - msleep(10); - } - - if (!list_empty(&pq->sent)) { - struct list_head free_list; - - printk(KERN_INFO "drain: lists not empty: forcing!\n"); - INIT_LIST_HEAD(&free_list); - mutex_lock(&pq->lock); - list_splice_init(&pq->sent, &free_list); - ipath_user_sdma_free_pkt_list(&dd->pcidev->dev, pq, &free_list); - mutex_unlock(&pq->lock); - } -} - -static inline __le64 ipath_sdma_make_desc0(struct ipath_devdata *dd, - u64 addr, u64 dwlen, u64 dwoffset) -{ - return cpu_to_le64(/* SDmaPhyAddr[31:0] */ - ((addr & 0xfffffffcULL) << 32) | - /* SDmaGeneration[1:0] */ - ((dd->ipath_sdma_generation & 3ULL) << 30) | - /* SDmaDwordCount[10:0] */ - ((dwlen & 0x7ffULL) << 16) | - /* SDmaBufOffset[12:2] */ - (dwoffset & 0x7ffULL)); -} - -static inline __le64 ipath_sdma_make_first_desc0(__le64 descq) -{ - return descq | cpu_to_le64(1ULL << 12); -} - -static inline __le64 ipath_sdma_make_last_desc0(__le64 descq) -{ - /* last */ /* dma head */ - return descq | cpu_to_le64(1ULL << 11 | 1ULL << 13); -} - -static inline __le64 ipath_sdma_make_desc1(u64 addr) -{ - /* SDmaPhyAddr[47:32] */ - return cpu_to_le64(addr >> 32); -} - -static void ipath_user_sdma_send_frag(struct ipath_devdata *dd, - struct ipath_user_sdma_pkt *pkt, int idx, - unsigned ofs, u16 tail) -{ - 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 = &dd->ipath_sdma_descq[tail].qw[0]; - - descq0 = ipath_sdma_make_desc0(dd, addr, dwlen, ofs); - if (idx == 0) - descq0 = ipath_sdma_make_first_desc0(descq0); - if (idx == pkt->naddr - 1) - descq0 = ipath_sdma_make_last_desc0(descq0); - - descqp[0] = descq0; - descqp[1] = ipath_sdma_make_desc1(addr); -} - -/* pq->lock must be held, get packets on the wire... */ -static int ipath_user_sdma_push_pkts(struct ipath_devdata *dd, - struct ipath_user_sdma_queue *pq, - struct list_head *pktlist) -{ - int ret = 0; - unsigned long flags; - u16 tail; - - if (list_empty(pktlist)) - return 0; - - if (unlikely(!(dd->ipath_flags & IPATH_LINKACTIVE))) - return -ECOMM; - - spin_lock_irqsave(&dd->ipath_sdma_lock, flags); - - if (unlikely(dd->ipath_sdma_status & IPATH_SDMA_ABORT_MASK)) { - ret = -ECOMM; - goto unlock; - } - - tail = dd->ipath_sdma_descq_tail; - while (!list_empty(pktlist)) { - struct ipath_user_sdma_pkt *pkt = - list_entry(pktlist->next, struct ipath_user_sdma_pkt, - list); - int i; - unsigned ofs = 0; - u16 dtail = tail; - - if (pkt->naddr > ipath_sdma_descq_freecnt(dd)) - goto unlock_check_tail; - - for (i = 0; i < pkt->naddr; i++) { - ipath_user_sdma_send_frag(dd, pkt, i, ofs, tail); - ofs += pkt->addr[i].length >> 2; - - if (++tail == dd->ipath_sdma_descq_cnt) { - tail = 0; - ++dd->ipath_sdma_generation; - } - } - - if ((ofs<<2) > dd->ipath_ibmaxlen) { - ipath_dbg("packet size %X > ibmax %X, fail\n", - ofs<<2, dd->ipath_ibmaxlen); - ret = -EMSGSIZE; - goto unlock; - } - - /* - * 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 >= IPATH_SMALLBUF_DWORDS) { - for (i = 0; i < pkt->naddr; i++) { - dd->ipath_sdma_descq[dtail].qw[0] |= - cpu_to_le64(1ULL << 14); - if (++dtail == dd->ipath_sdma_descq_cnt) - dtail = 0; - } - } - - dd->ipath_sdma_descq_added += pkt->naddr; - pkt->added = dd->ipath_sdma_descq_added; - list_move_tail(&pkt->list, &pq->sent); - ret++; - } - -unlock_check_tail: - /* advance the tail on the chip if necessary */ - if (dd->ipath_sdma_descq_tail != tail) { - wmb(); - ipath_write_kreg(dd, dd->ipath_kregs->kr_senddmatail, tail); - dd->ipath_sdma_descq_tail = tail; - } - -unlock: - spin_unlock_irqrestore(&dd->ipath_sdma_lock, flags); - - return ret; -} - -int ipath_user_sdma_writev(struct ipath_devdata *dd, - struct ipath_user_sdma_queue *pq, - const struct iovec *iov, - unsigned long dim) -{ - int ret = 0; - struct list_head list; - int npkts = 0; - - INIT_LIST_HEAD(&list); - - mutex_lock(&pq->lock); - - if (dd->ipath_sdma_descq_added != dd->ipath_sdma_descq_removed) { - ipath_user_sdma_hwqueue_clean(dd); - ipath_user_sdma_queue_clean(dd, pq); - } - - while (dim) { - const int mxp = 8; - - ret = ipath_user_sdma_queue_pkts(dd, pq, &list, iov, dim, mxp); - 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. the 4 is a guess of about - * how many sdma descriptors a packet will take (it - * doesn't have to be perfect). - */ - if (ipath_sdma_descq_freecnt(dd) < ret * 4) { - ipath_user_sdma_hwqueue_clean(dd); - ipath_user_sdma_queue_clean(dd, pq); - } - - ret = ipath_user_sdma_push_pkts(dd, pq, &list); - if (ret < 0) - goto done_unlock; - else { - npkts += ret; - pq->counter += ret; - - if (!list_empty(&list)) - goto done_unlock; - } - } - } - -done_unlock: - if (!list_empty(&list)) - ipath_user_sdma_free_pkt_list(&dd->pcidev->dev, pq, &list); - mutex_unlock(&pq->lock); - - return (ret < 0) ? ret : npkts; -} - -int ipath_user_sdma_make_progress(struct ipath_devdata *dd, - struct ipath_user_sdma_queue *pq) -{ - int ret = 0; - - mutex_lock(&pq->lock); - ipath_user_sdma_hwqueue_clean(dd); - ret = ipath_user_sdma_queue_clean(dd, pq); - mutex_unlock(&pq->lock); - - return ret; -} - -u32 ipath_user_sdma_complete_counter(const struct ipath_user_sdma_queue *pq) -{ - return pq->sent_counter; -} - -u32 ipath_user_sdma_inflight_counter(struct ipath_user_sdma_queue *pq) -{ - return pq->counter; -} - |