diff options
Diffstat (limited to 'drivers/staging/rdma/hfi1/user_exp_rcv.c')
| -rw-r--r-- | drivers/staging/rdma/hfi1/user_exp_rcv.c | 1044 |
1 files changed, 1044 insertions, 0 deletions
diff --git a/drivers/staging/rdma/hfi1/user_exp_rcv.c b/drivers/staging/rdma/hfi1/user_exp_rcv.c new file mode 100644 index 000000000000..0861e095df8d --- /dev/null +++ b/drivers/staging/rdma/hfi1/user_exp_rcv.c @@ -0,0 +1,1044 @@ +/* + * 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 <asm/page.h> + +#include "user_exp_rcv.h" +#include "trace.h" +#include "mmu_rb.h" + +struct tid_group { + struct list_head list; + unsigned base; + u8 size; + u8 used; + u8 map; +}; + +struct tid_rb_node { + struct mmu_rb_node mmu; + unsigned long phys; + struct tid_group *grp; + u32 rcventry; + dma_addr_t dma_addr; + bool freed; + unsigned npages; + struct page *pages[0]; +}; + +struct tid_pageset { + u16 idx; + u16 count; +}; + +#define EXP_TID_SET_EMPTY(set) (set.count == 0 && list_empty(&set.list)) + +#define num_user_pages(vaddr, len) \ + (1 + (((((unsigned long)(vaddr) + \ + (unsigned long)(len) - 1) & PAGE_MASK) - \ + ((unsigned long)vaddr & PAGE_MASK)) >> PAGE_SHIFT)) + +static void unlock_exp_tids(struct hfi1_ctxtdata *, struct exp_tid_set *, + struct rb_root *); +static u32 find_phys_blocks(struct page **, unsigned, struct tid_pageset *); +static int set_rcvarray_entry(struct file *, unsigned long, u32, + struct tid_group *, struct page **, unsigned); +static int mmu_rb_insert(struct rb_root *, struct mmu_rb_node *); +static void mmu_rb_remove(struct rb_root *, struct mmu_rb_node *, bool); +static int mmu_rb_invalidate(struct rb_root *, struct mmu_rb_node *); +static int program_rcvarray(struct file *, unsigned long, struct tid_group *, + struct tid_pageset *, unsigned, u16, struct page **, + u32 *, unsigned *, unsigned *); +static int unprogram_rcvarray(struct file *, u32, struct tid_group **); +static void clear_tid_node(struct hfi1_filedata *, u16, struct tid_rb_node *); + +static struct mmu_rb_ops tid_rb_ops = { + .insert = mmu_rb_insert, + .remove = mmu_rb_remove, + .invalidate = mmu_rb_invalidate +}; + +static inline u32 rcventry2tidinfo(u32 rcventry) +{ + u32 pair = rcventry & ~0x1; + + return EXP_TID_SET(IDX, pair >> 1) | + EXP_TID_SET(CTRL, 1 << (rcventry - pair)); +} + +static inline void exp_tid_group_init(struct exp_tid_set *set) +{ + INIT_LIST_HEAD(&set->list); + set->count = 0; +} + +static inline void tid_group_remove(struct tid_group *grp, + struct exp_tid_set *set) +{ + list_del_init(&grp->list); + set->count--; +} + +static inline void tid_group_add_tail(struct tid_group *grp, + struct exp_tid_set *set) +{ + list_add_tail(&grp->list, &set->list); + set->count++; +} + +static inline struct tid_group *tid_group_pop(struct exp_tid_set *set) +{ + struct tid_group *grp = + list_first_entry(&set->list, struct tid_group, list); + list_del_init(&grp->list); + set->count--; + return grp; +} + +static inline void tid_group_move(struct tid_group *group, + struct exp_tid_set *s1, + struct exp_tid_set *s2) +{ + tid_group_remove(group, s1); + tid_group_add_tail(group, s2); +} + +/* + * Initialize context and file private data needed for Expected + * receive caching. This needs to be done after the context has + * been configured with the eager/expected RcvEntry counts. + */ +int hfi1_user_exp_rcv_init(struct file *fp) +{ + struct hfi1_filedata *fd = fp->private_data; + struct hfi1_ctxtdata *uctxt = fd->uctxt; + struct hfi1_devdata *dd = uctxt->dd; + unsigned tidbase; + int i, ret = 0; + + spin_lock_init(&fd->tid_lock); + spin_lock_init(&fd->invalid_lock); + fd->tid_rb_root = RB_ROOT; + + if (!uctxt->subctxt_cnt || !fd->subctxt) { + exp_tid_group_init(&uctxt->tid_group_list); + exp_tid_group_init(&uctxt->tid_used_list); + exp_tid_group_init(&uctxt->tid_full_list); + + tidbase = uctxt->expected_base; + for (i = 0; i < uctxt->expected_count / + dd->rcv_entries.group_size; i++) { + struct tid_group *grp; + + grp = kzalloc(sizeof(*grp), GFP_KERNEL); + if (!grp) { + /* + * If we fail here, the groups already + * allocated will be freed by the close + * call. + */ + ret = -ENOMEM; + goto done; + } + grp->size = dd->rcv_entries.group_size; + grp->base = tidbase; + tid_group_add_tail(grp, &uctxt->tid_group_list); + tidbase += dd->rcv_entries.group_size; + } + } + + fd->entry_to_rb = kcalloc(uctxt->expected_count, + sizeof(struct rb_node *), + GFP_KERNEL); + if (!fd->entry_to_rb) + return -ENOMEM; + + if (!HFI1_CAP_IS_USET(TID_UNMAP)) { + fd->invalid_tid_idx = 0; + fd->invalid_tids = kzalloc(uctxt->expected_count * + sizeof(u32), GFP_KERNEL); + if (!fd->invalid_tids) { + ret = -ENOMEM; + goto done; + } + + /* + * Register MMU notifier callbacks. If the registration + * fails, continue but turn off the TID caching for + * all user contexts. + */ + ret = hfi1_mmu_rb_register(&fd->tid_rb_root, &tid_rb_ops); + if (ret) { + dd_dev_info(dd, + "Failed MMU notifier registration %d\n", + ret); + HFI1_CAP_USET(TID_UNMAP); + ret = 0; + } + } + + /* + * PSM does not have a good way to separate, count, and + * effectively enforce a limit on RcvArray entries used by + * subctxts (when context sharing is used) when TID caching + * is enabled. To help with that, we calculate a per-process + * RcvArray entry share and enforce that. + * If TID caching is not in use, PSM deals with usage on its + * own. In that case, we allow any subctxt to take all of the + * entries. + * + * Make sure that we set the tid counts only after successful + * init. + */ + spin_lock(&fd->tid_lock); + if (uctxt->subctxt_cnt && !HFI1_CAP_IS_USET(TID_UNMAP)) { + u16 remainder; + + fd->tid_limit = uctxt->expected_count / uctxt->subctxt_cnt; + remainder = uctxt->expected_count % uctxt->subctxt_cnt; + if (remainder && fd->subctxt < remainder) + fd->tid_limit++; + } else { + fd->tid_limit = uctxt->expected_count; + } + spin_unlock(&fd->tid_lock); +done: + return ret; +} + +int hfi1_user_exp_rcv_free(struct hfi1_filedata *fd) +{ + struct hfi1_ctxtdata *uctxt = fd->uctxt; + struct tid_group *grp, *gptr; + + /* + * The notifier would have been removed when the process'es mm + * was freed. + */ + if (!HFI1_CAP_IS_USET(TID_UNMAP)) + hfi1_mmu_rb_unregister(&fd->tid_rb_root); + + kfree(fd->invalid_tids); + + if (!uctxt->cnt) { + if (!EXP_TID_SET_EMPTY(uctxt->tid_full_list)) + unlock_exp_tids(uctxt, &uctxt->tid_full_list, + &fd->tid_rb_root); + if (!EXP_TID_SET_EMPTY(uctxt->tid_used_list)) + unlock_exp_tids(uctxt, &uctxt->tid_used_list, + &fd->tid_rb_root); + list_for_each_entry_safe(grp, gptr, &uctxt->tid_group_list.list, + list) { + list_del_init(&grp->list); + kfree(grp); + } + hfi1_clear_tids(uctxt); + } + + kfree(fd->entry_to_rb); + return 0; +} + +/* + * Write an "empty" RcvArray entry. + * This function exists so the TID registaration code can use it + * to write to unused/unneeded entries and still take advantage + * of the WC performance improvements. The HFI will ignore this + * write to the RcvArray entry. + */ +static inline void rcv_array_wc_fill(struct hfi1_devdata *dd, u32 index) +{ + /* + * Doing the WC fill writes only makes sense if the device is + * present and the RcvArray has been mapped as WC memory. + */ + if ((dd->flags & HFI1_PRESENT) && dd->rcvarray_wc) + writeq(0, dd->rcvarray_wc + (index * 8)); +} + +/* + * RcvArray entry allocation for Expected Receives is done by the + * following algorithm: + * + * The context keeps 3 lists of groups of RcvArray entries: + * 1. List of empty groups - tid_group_list + * This list is created during user context creation and + * contains elements which describe sets (of 8) of empty + * RcvArray entries. + * 2. List of partially used groups - tid_used_list + * This list contains sets of RcvArray entries which are + * not completely used up. Another mapping request could + * use some of all of the remaining entries. + * 3. List of full groups - tid_full_list + * This is the list where sets that are completely used + * up go. + * + * An attempt to optimize the usage of RcvArray entries is + * made by finding all sets of physically contiguous pages in a + * user's buffer. + * These physically contiguous sets are further split into + * sizes supported by the receive engine of the HFI. The + * resulting sets of pages are stored in struct tid_pageset, + * which describes the sets as: + * * .count - number of pages in this set + * * .idx - starting index into struct page ** array + * of this set + * + * From this point on, the algorithm deals with the page sets + * described above. The number of pagesets is divided by the + * RcvArray group size to produce the number of full groups + * needed. + * + * Groups from the 3 lists are manipulated using the following + * rules: + * 1. For each set of 8 pagesets, a complete group from + * tid_group_list is taken, programmed, and moved to + * the tid_full_list list. + * 2. For all remaining pagesets: + * 2.1 If the tid_used_list is empty and the tid_group_list + * is empty, stop processing pageset and return only + * what has been programmed up to this point. + * 2.2 If the tid_used_list is empty and the tid_group_list + * is not empty, move a group from tid_group_list to + * tid_used_list. + * 2.3 For each group is tid_used_group, program as much as + * can fit into the group. If the group becomes fully + * used, move it to tid_full_list. + */ +int hfi1_user_exp_rcv_setup(struct file *fp, struct hfi1_tid_info *tinfo) +{ + int ret = 0, need_group = 0, pinned; + struct hfi1_filedata *fd = fp->private_data; + struct hfi1_ctxtdata *uctxt = fd->uctxt; + struct hfi1_devdata *dd = uctxt->dd; + unsigned npages, ngroups, pageidx = 0, pageset_count, npagesets, + tididx = 0, mapped, mapped_pages = 0; + unsigned long vaddr = tinfo->vaddr; + struct page **pages = NULL; + u32 *tidlist = NULL; + struct tid_pageset *pagesets = NULL; + + /* Get the number of pages the user buffer spans */ + npages = num_user_pages(vaddr, tinfo->length); + if (!npages) + return -EINVAL; + + if (npages > uctxt->expected_count) { + dd_dev_err(dd, "Expected buffer too big\n"); + return -EINVAL; + } + + /* Verify that access is OK for the user buffer */ + if (!access_ok(VERIFY_WRITE, (void __user *)vaddr, + npages * PAGE_SIZE)) { + dd_dev_err(dd, "Fail vaddr %p, %u pages, !access_ok\n", + (void *)vaddr, npages); + return -EFAULT; + } + + pagesets = kcalloc(uctxt->expected_count, sizeof(*pagesets), + GFP_KERNEL); + if (!pagesets) + return -ENOMEM; + + /* Allocate the array of struct page pointers needed for pinning */ + pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL); + if (!pages) { + ret = -ENOMEM; + goto bail; + } + + /* + * Pin all the pages of the user buffer. If we can't pin all the + * pages, accept the amount pinned so far and program only that. + * User space knows how to deal with partially programmed buffers. + */ + if (!hfi1_can_pin_pages(dd, fd->tid_n_pinned, npages)) + return -ENOMEM; + pinned = hfi1_acquire_user_pages(vaddr, npages, true, pages); + if (pinned <= 0) { + ret = pinned; + goto bail; + } + fd->tid_n_pinned += npages; + + /* Find sets of physically contiguous pages */ + npagesets = find_phys_blocks(pages, pinned, pagesets); + + /* + * We don't need to access this under a lock since tid_used is per + * process and the same process cannot be in hfi1_user_exp_rcv_clear() + * and hfi1_user_exp_rcv_setup() at the same time. + */ + spin_lock(&fd->tid_lock); + if (fd->tid_used + npagesets > fd->tid_limit) + pageset_count = fd->tid_limit - fd->tid_used; + else + pageset_count = npagesets; + spin_unlock(&fd->tid_lock); + + if (!pageset_count) + goto bail; + + ngroups = pageset_count / dd->rcv_entries.group_size; + tidlist = kcalloc(pageset_count, sizeof(*tidlist), GFP_KERNEL); + if (!tidlist) { + ret = -ENOMEM; + goto nomem; + } + + tididx = 0; + + /* + * From this point on, we are going to be using shared (between master + * and subcontexts) context resources. We need to take the lock. + */ + mutex_lock(&uctxt->exp_lock); + /* + * The first step is to program the RcvArray entries which are complete + * groups. + */ + while (ngroups && uctxt->tid_group_list.count) { + struct tid_group *grp = + tid_group_pop(&uctxt->tid_group_list); + + ret = program_rcvarray(fp, vaddr, grp, pagesets, + pageidx, dd->rcv_entries.group_size, + pages, tidlist, &tididx, &mapped); + /* + * If there was a failure to program the RcvArray + * entries for the entire group, reset the grp fields + * and add the grp back to the free group list. + */ + if (ret <= 0) { + tid_group_add_tail(grp, &uctxt->tid_group_list); + hfi1_cdbg(TID, + "Failed to program RcvArray group %d", ret); + goto unlock; + } + + tid_group_add_tail(grp, &uctxt->tid_full_list); + ngroups--; + pageidx += ret; + mapped_pages += mapped; + } + + while (pageidx < pageset_count) { + struct tid_group *grp, *ptr; + /* + * If we don't have any partially used tid groups, check + * if we have empty groups. If so, take one from there and + * put in the partially used list. + */ + if (!uctxt->tid_used_list.count || need_group) { + if (!uctxt->tid_group_list.count) + goto unlock; + + grp = tid_group_pop(&uctxt->tid_group_list); + tid_group_add_tail(grp, &uctxt->tid_used_list); + need_group = 0; + } + /* + * There is an optimization opportunity here - instead of + * fitting as many page sets as we can, check for a group + * later on in the list that could fit all of them. + */ + list_for_each_entry_safe(grp, ptr, &uctxt->tid_used_list.list, + list) { + unsigned use = min_t(unsigned, pageset_count - pageidx, + grp->size - grp->used); + + ret = program_rcvarray(fp, vaddr, grp, pagesets, + pageidx, use, pages, tidlist, + &tididx, &mapped); + if (ret < 0) { + hfi1_cdbg(TID, + "Failed to program RcvArray entries %d", + ret); + ret = -EFAULT; + goto unlock; + } else if (ret > 0) { + if (grp->used == grp->size) + tid_group_move(grp, + &uctxt->tid_used_list, + &uctxt->tid_full_list); + pageidx += ret; + mapped_pages += mapped; + need_group = 0; + /* Check if we are done so we break out early */ + if (pageidx >= pageset_count) + break; + } else if (WARN_ON(ret == 0)) { + /* + * If ret is 0, we did not program any entries + * into this group, which can only happen if + * we've screwed up the accounting somewhere. + * Warn and try to continue. + */ + need_group = 1; + } + } + } +unlock: + mutex_unlock(&uctxt->exp_lock); +nomem: + hfi1_cdbg(TID, "total mapped: tidpairs:%u pages:%u (%d)", tididx, + mapped_pages, ret); + if (tididx) { + spin_lock(&fd->tid_lock); + fd->tid_used += tididx; + spin_unlock(&fd->tid_lock); + tinfo->tidcnt = tididx; + tinfo->length = mapped_pages * PAGE_SIZE; + + if (copy_to_user((void __user *)(unsigned long)tinfo->tidlist, + tidlist, sizeof(tidlist[0]) * tididx)) { + /* + * On failure to copy to the user level, we need to undo + * everything done so far so we don't leak resources. + */ + tinfo->tidlist = (unsigned long)&tidlist; + hfi1_user_exp_rcv_clear(fp, tinfo); + tinfo->tidlist = 0; + ret = -EFAULT; + goto bail; + } + } + + /* + * If not everything was mapped (due to insufficient RcvArray entries, + * for example), unpin all unmapped pages so we can pin them nex time. + */ + if (mapped_pages != pinned) { + hfi1_release_user_pages(current->mm, &pages[mapped_pages], + pinned - mapped_pages, + false); + fd->tid_n_pinned -= pinned - mapped_pages; + } +bail: + kfree(pagesets); + kfree(pages); + kfree(tidlist); + return ret > 0 ? 0 : ret; +} + +int hfi1_user_exp_rcv_clear(struct file *fp, struct hfi1_tid_info *tinfo) +{ + int ret = 0; + struct hfi1_filedata *fd = fp->private_data; + struct hfi1_ctxtdata *uctxt = fd->uctxt; + u32 *tidinfo; + unsigned tididx; + + tidinfo = kcalloc(tinfo->tidcnt, sizeof(*tidinfo), GFP_KERNEL); + if (!tidinfo) + return -ENOMEM; + + if (copy_from_user(tidinfo, (void __user *)(unsigned long) + tinfo->tidlist, sizeof(tidinfo[0]) * + tinfo->tidcnt)) { + ret = -EFAULT; + goto done; + } + + mutex_lock(&uctxt->exp_lock); + for (tididx = 0; tididx < tinfo->tidcnt; tididx++) { + ret = unprogram_rcvarray(fp, tidinfo[tididx], NULL); + if (ret) { + hfi1_cdbg(TID, "Failed to unprogram rcv array %d", + ret); + break; + } + } + spin_lock(&fd->tid_lock); + fd->tid_used -= tididx; + spin_unlock(&fd->tid_lock); + tinfo->tidcnt = tididx; + mutex_unlock(&uctxt->exp_lock); +done: + kfree(tidinfo); + return ret; +} + +int hfi1_user_exp_rcv_invalid(struct file *fp, struct hfi1_tid_info *tinfo) +{ + struct hfi1_filedata *fd = fp->private_data; + struct hfi1_ctxtdata *uctxt = fd->uctxt; + unsigned long *ev = uctxt->dd->events + + (((uctxt->ctxt - uctxt->dd->first_user_ctxt) * + HFI1_MAX_SHARED_CTXTS) + fd->subctxt); + u32 *array; + int ret = 0; + + if (!fd->invalid_tids) + return -EINVAL; + + /* + * copy_to_user() can sleep, which will leave the invalid_lock + * locked and cause the MMU notifier to be blocked on the lock + * for a long time. + * Copy the data to a local buffer so we can release the lock. + */ + array = kcalloc(uctxt->expected_count, sizeof(*array), GFP_KERNEL); + if (!array) + return -EFAULT; + + spin_lock(&fd->invalid_lock); + if (fd->invalid_tid_idx) { + memcpy(array, fd->invalid_tids, sizeof(*array) * + fd->invalid_tid_idx); + memset(fd->invalid_tids, 0, sizeof(*fd->invalid_tids) * + fd->invalid_tid_idx); + tinfo->tidcnt = fd->invalid_tid_idx; + fd->invalid_tid_idx = 0; + /* + * Reset the user flag while still holding the lock. + * Otherwise, PSM can miss events. + */ + clear_bit(_HFI1_EVENT_TID_MMU_NOTIFY_BIT, ev); + } else { + tinfo->tidcnt = 0; + } + spin_unlock(&fd->invalid_lock); + + if (tinfo->tidcnt) { + if (copy_to_user((void __user *)tinfo->tidlist, + array, sizeof(*array) * tinfo->tidcnt)) + ret = -EFAULT; + } + kfree(array); + + return ret; +} + +static u32 find_phys_blocks(struct page **pages, unsigned npages, + struct tid_pageset *list) +{ + unsigned pagecount, pageidx, setcount = 0, i; + unsigned long pfn, this_pfn; + + if (!npages) + return 0; + + /* + * Look for sets of physically contiguous pages in the user buffer. + * This will allow us to optimize Expected RcvArray entry usage by + * using the bigger supported sizes. + */ + pfn = page_to_pfn(pages[0]); + for (pageidx = 0, pagecount = 1, i = 1; i <= npages; i++) { + this_pfn = i < npages ? page_to_pfn(pages[i]) : 0; + + /* + * If the pfn's are not sequential, pages are not physically + * contiguous. + */ + if (this_pfn != ++pfn) { + /* + * At this point we have to loop over the set of + * physically contiguous pages and break them down it + * sizes supported by the HW. + * There are two main constraints: + * 1. The max buffer size is MAX_EXPECTED_BUFFER. + * If the total set size is bigger than that + * program only a MAX_EXPECTED_BUFFER chunk. + * 2. The buffer size has to be a power of two. If + * it is not, round down to the closes power of + * 2 and program that size. + */ + while (pagecount) { + int maxpages = pagecount; + u32 bufsize = pagecount * PAGE_SIZE; + + if (bufsize > MAX_EXPECTED_BUFFER) + maxpages = + MAX_EXPECTED_BUFFER >> + PAGE_SHIFT; + else if (!is_power_of_2(bufsize)) + maxpages = + rounddown_pow_of_two(bufsize) >> + PAGE_SHIFT; + + list[setcount].idx = pageidx; + list[setcount].count = maxpages; + pagecount -= maxpages; + pageidx += maxpages; + setcount++; + } + pageidx = i; + pagecount = 1; + pfn = this_pfn; + } else { + pagecount++; + } + } + return setcount; +} + +/** + * program_rcvarray() - program an RcvArray group with receive buffers + * @fp: file pointer + * @vaddr: starting user virtual address + * @grp: RcvArray group + * @sets: array of struct tid_pageset holding information on physically + * contiguous chunks from the user buffer + * @start: starting index into sets array + * @count: number of struct tid_pageset's to program + * @pages: an array of struct page * for the user buffer + * @tidlist: the array of u32 elements when the information about the + * programmed RcvArray entries is to be encoded. + * @tididx: starting offset into tidlist + * @pmapped: (output parameter) number of pages programmed into the RcvArray + * entries. + * + * This function will program up to 'count' number of RcvArray entries from the + * group 'grp'. To make best use of write-combining writes, the function will + * perform writes to the unused RcvArray entries which will be ignored by the + * HW. Each RcvArray entry will be programmed with a physically contiguous + * buffer chunk from the user's virtual buffer. + * + * Return: + * -EINVAL if the requested count is larger than the size of the group, + * -ENOMEM or -EFAULT on error from set_rcvarray_entry(), or + * number of RcvArray entries programmed. + */ +static int program_rcvarray(struct file *fp, unsigned long vaddr, + struct tid_group *grp, + struct tid_pageset *sets, + unsigned start, u16 count, struct page **pages, + u32 *tidlist, unsigned *tididx, unsigned *pmapped) +{ + struct hfi1_filedata *fd = fp->private_data; + struct hfi1_ctxtdata *uctxt = fd->uctxt; + struct hfi1_devdata *dd = uctxt->dd; + u16 idx; + u32 tidinfo = 0, rcventry, useidx = 0; + int mapped = 0; + + /* Count should never be larger than the group size */ + if (count > grp->size) + return -EINVAL; + + /* Find the first unused entry in the group */ + for (idx = 0; idx < grp->size; idx++) { + if (!(grp->map & (1 << idx))) { + useidx = idx; + break; + } + rcv_array_wc_fill(dd, grp->base + idx); + } + + idx = 0; + while (idx < count) { + u16 npages, pageidx, setidx = start + idx; + int ret = 0; + + /* + * If this entry in the group is used, move to the next one. + * If we go past the end of the group, exit the loop. + */ + if (useidx >= grp->size) { + break; + } else if (grp->map & (1 << useidx)) { + rcv_array_wc_fill(dd, grp->base + useidx); + useidx++; + continue; + } + + rcventry = grp->base + useidx; + npages = sets[setidx].count; + pageidx = sets[setidx].idx; + + ret = set_rcvarray_entry(fp, vaddr + (pageidx * PAGE_SIZE), + rcventry, grp, pages + pageidx, + npages); + if (ret) + return ret; + mapped += npages; + + tidinfo = rcventry2tidinfo(rcventry - uctxt->expected_base) | + EXP_TID_SET(LEN, npages); + tidlist[(*tididx)++] = tidinfo; + grp->used++; + grp->map |= 1 << useidx++; + idx++; + } + + /* Fill the rest of the group with "blank" writes */ + for (; useidx < grp->size; useidx++) + rcv_array_wc_fill(dd, grp->base + useidx); + *pmapped = mapped; + return idx; +} + +static int set_rcvarray_entry(struct file *fp, unsigned long vaddr, + u32 rcventry, struct tid_group *grp, + struct page **pages, unsigned npages) +{ + int ret; + struct hfi1_filedata *fd = fp->private_data; + struct hfi1_ctxtdata *uctxt = fd->uctxt; + struct tid_rb_node *node; + struct hfi1_devdata *dd = uctxt->dd; + struct rb_root *root = &fd->tid_rb_root; + dma_addr_t phys; + + /* + * Allocate the node first so we can handle a potential + * failure before we've programmed anything. + */ + node = kzalloc(sizeof(*node) + (sizeof(struct page *) * npages), + GFP_KERNEL); + if (!node) + return -ENOMEM; + + phys = pci_map_single(dd->pcidev, + __va(page_to_phys(pages[0])), + npages * PAGE_SIZE, PCI_DMA_FROMDEVICE); + if (dma_mapping_error(&dd->pcidev->dev, phys)) { + dd_dev_err(dd, "Failed to DMA map Exp Rcv pages 0x%llx\n", + phys); + kfree(node); + return -EFAULT; + } + + node->mmu.addr = vaddr; + node->mmu.len = npages * PAGE_SIZE; + node->phys = page_to_phys(pages[0]); + node->npages = npages; + node->rcventry = rcventry; + node->dma_addr = phys; + node->grp = grp; + node->freed = false; + memcpy(node->pages, pages, sizeof(struct page *) * npages); + + if (HFI1_CAP_IS_USET(TID_UNMAP)) + ret = mmu_rb_insert(root, &node->mmu); + else + ret = hfi1_mmu_rb_insert(root, &node->mmu); + + if (ret) { + hfi1_cdbg(TID, "Failed to insert RB node %u 0x%lx, 0x%lx %d", + node->rcventry, node->mmu.addr, node->phys, ret); + pci_unmap_single(dd->pcidev, phys, npages * PAGE_SIZE, + PCI_DMA_FROMDEVICE); + kfree(node); + return -EFAULT; + } + hfi1_put_tid(dd, rcventry, PT_EXPECTED, phys, ilog2(npages) + 1); + trace_hfi1_exp_tid_reg(uctxt->ctxt, fd->subctxt, rcventry, npages, + node->mmu.addr, node->phys, phys); + return 0; +} + +static int unprogram_rcvarray(struct file *fp, u32 tidinfo, + struct tid_group **grp) +{ + struct hfi1_filedata *fd = fp->private_data; + struct hfi1_ctxtdata *uctxt = fd->uctxt; + struct hfi1_devdata *dd = uctxt->dd; + struct tid_rb_node *node; + u8 tidctrl = EXP_TID_GET(tidinfo, CTRL); + u32 tididx = EXP_TID_GET(tidinfo, IDX) << 1, rcventry; + + if (tididx >= uctxt->expected_count) { + dd_dev_err(dd, "Invalid RcvArray entry (%u) index for ctxt %u\n", + tididx, uctxt->ctxt); + return -EINVAL; + } + + if (tidctrl == 0x3) + return -EINVAL; + + rcventry = tididx + (tidctrl - 1); + + node = fd->entry_to_rb[rcventry]; + if (!node || node->rcventry != (uctxt->expected_base + rcventry)) + return -EBADF; + if (HFI1_CAP_IS_USET(TID_UNMAP)) + mmu_rb_remove(&fd->tid_rb_root, &node->mmu, false); + else + hfi1_mmu_rb_remove(&fd->tid_rb_root, &node->mmu); + + if (grp) + *grp = node->grp; + clear_tid_node(fd, fd->subctxt, node); + return 0; +} + +static void clear_tid_node(struct hfi1_filedata *fd, u16 subctxt, + struct tid_rb_node *node) +{ + struct hfi1_ctxtdata *uctxt = fd->uctxt; + struct hfi1_devdata *dd = uctxt->dd; + + trace_hfi1_exp_tid_unreg(uctxt->ctxt, fd->subctxt, node->rcventry, + node->npages, node->mmu.addr, node->phys, + node->dma_addr); + + hfi1_put_tid(dd, node->rcventry, PT_INVALID, 0, 0); + /* + * Make sure device has seen the write before we unpin the + * pages. + */ + flush_wc(); + + pci_unmap_single(dd->pcidev, node->dma_addr, node->mmu.len, + PCI_DMA_FROMDEVICE); + hfi1_release_user_pages(current->mm, node->pages, node->npages, true); + fd->tid_n_pinned -= node->npages; + + node->grp->used--; + node->grp->map &= ~(1 << (node->rcventry - node->grp->base)); + + if (node->grp->used == node->grp->size - 1) + tid_group_move(node->grp, &uctxt->tid_full_list, + &uctxt->tid_used_list); + else if (!node->grp->used) + tid_group_move(node->grp, &uctxt->tid_used_list, + &uctxt->tid_group_list); + kfree(node); +} + +static void unlock_exp_tids(struct hfi1_ctxtdata *uctxt, + struct exp_tid_set *set, struct rb_root *root) +{ + struct tid_group *grp, *ptr; + struct hfi1_filedata *fd = container_of(root, struct hfi1_filedata, + tid_rb_root); + int i; + + list_for_each_entry_safe(grp, ptr, &set->list, list) { + list_del_init(&grp->list); + + for (i = 0; i < grp->size; i++) { + if (grp->map & (1 << i)) { + u16 rcventry = grp->base + i; + struct tid_rb_node *node; + + node = fd->entry_to_rb[rcventry - + uctxt->expected_base]; + if (!node || node->rcventry != rcventry) + continue; + if (HFI1_CAP_IS_USET(TID_UNMAP)) + mmu_rb_remove(&fd->tid_rb_root, + &node->mmu, false); + else + hfi1_mmu_rb_remove(&fd->tid_rb_root, + &node->mmu); + clear_tid_node(fd, -1, node); + } + } + } +} + +static int mmu_rb_invalidate(struct rb_root *root, struct mmu_rb_node *mnode) +{ + struct hfi1_filedata *fdata = + container_of(root, struct hfi1_filedata, tid_rb_root); + struct hfi1_ctxtdata *uctxt = fdata->uctxt; + struct tid_rb_node *node = + container_of(mnode, struct tid_rb_node, mmu); + + if (node->freed) + return 0; + + trace_hfi1_exp_tid_inval(uctxt->ctxt, fdata->subctxt, node->mmu.addr, + node->rcventry, node->npages, node->dma_addr); + node->freed = true; + + spin_lock(&fdata->invalid_lock); + if (fdata->invalid_tid_idx < uctxt->expected_count) { + fdata->invalid_tids[fdata->invalid_tid_idx] = + rcventry2tidinfo(node->rcventry - uctxt->expected_base); + fdata->invalid_tids[fdata->invalid_tid_idx] |= + EXP_TID_SET(LEN, node->npages); + if (!fdata->invalid_tid_idx) { + unsigned long *ev; + + /* + * hfi1_set_uevent_bits() sets a user event flag + * for all processes. Because calling into the + * driver to process TID cache invalidations is + * expensive and TID cache invalidations are + * handled on a per-process basis, we can + * optimize this to set the flag only for the + * process in question. + */ + ev = uctxt->dd->events + + (((uctxt->ctxt - uctxt->dd->first_user_ctxt) * + HFI1_MAX_SHARED_CTXTS) + fdata->subctxt); + set_bit(_HFI1_EVENT_TID_MMU_NOTIFY_BIT, ev); + } + fdata->invalid_tid_idx++; + } + spin_unlock(&fdata->invalid_lock); + return 0; +} + +static int mmu_rb_insert(struct rb_root *root, struct mmu_rb_node *node) +{ + struct hfi1_filedata *fdata = + container_of(root, struct hfi1_filedata, tid_rb_root); + struct tid_rb_node *tnode = + container_of(node, struct tid_rb_node, mmu); + u32 base = fdata->uctxt->expected_base; + + fdata->entry_to_rb[tnode->rcventry - base] = tnode; + return 0; +} + +static void mmu_rb_remove(struct rb_root *root, struct mmu_rb_node *node, + bool notifier) +{ + struct hfi1_filedata *fdata = + container_of(root, struct hfi1_filedata, tid_rb_root); + struct tid_rb_node *tnode = + container_of(node, struct tid_rb_node, mmu); + u32 base = fdata->uctxt->expected_base; + + fdata->entry_to_rb[tnode->rcventry - base] = NULL; +} |