From: Jason Gunthorpe jgg@mellanox.com
This converts one of the two users of mmu_notifiers to use the new API. The conversion is fairly straightforward, however the existing use of notifiers here seems to be racey.
Tested-by: Dennis Dalessandro dennis.dalessandro@intel.com Signed-off-by: Jason Gunthorpe jgg@mellanox.com --- drivers/infiniband/hw/hfi1/file_ops.c | 2 +- drivers/infiniband/hw/hfi1/hfi.h | 2 +- drivers/infiniband/hw/hfi1/user_exp_rcv.c | 146 +++++++++------------- drivers/infiniband/hw/hfi1/user_exp_rcv.h | 3 +- 4 files changed, 60 insertions(+), 93 deletions(-)
diff --git a/drivers/infiniband/hw/hfi1/file_ops.c b/drivers/infiniband/hw/hfi1/file_ops.c index f9a7e9d29c8ba2..7c5e3fb224139a 100644 --- a/drivers/infiniband/hw/hfi1/file_ops.c +++ b/drivers/infiniband/hw/hfi1/file_ops.c @@ -1138,7 +1138,7 @@ static int get_ctxt_info(struct hfi1_filedata *fd, unsigned long arg, u32 len) HFI1_CAP_UGET_MASK(uctxt->flags, MASK) | HFI1_CAP_KGET_MASK(uctxt->flags, K2U); /* adjust flag if this fd is not able to cache */ - if (!fd->handler) + if (!fd->use_mn) cinfo.runtime_flags |= HFI1_CAP_TID_UNMAP; /* no caching */
cinfo.num_active = hfi1_count_active_units(); diff --git a/drivers/infiniband/hw/hfi1/hfi.h b/drivers/infiniband/hw/hfi1/hfi.h index fa45350a9a1d32..fc10d65fc3e13c 100644 --- a/drivers/infiniband/hw/hfi1/hfi.h +++ b/drivers/infiniband/hw/hfi1/hfi.h @@ -1444,7 +1444,7 @@ struct hfi1_filedata { /* for cpu affinity; -1 if none */ int rec_cpu_num; u32 tid_n_pinned; - struct mmu_rb_handler *handler; + bool use_mn; struct tid_rb_node **entry_to_rb; spinlock_t tid_lock; /* protect tid_[limit,used] counters */ u32 tid_limit; diff --git a/drivers/infiniband/hw/hfi1/user_exp_rcv.c b/drivers/infiniband/hw/hfi1/user_exp_rcv.c index 3592a9ec155e85..75a378162162d3 100644 --- a/drivers/infiniband/hw/hfi1/user_exp_rcv.c +++ b/drivers/infiniband/hw/hfi1/user_exp_rcv.c @@ -59,11 +59,11 @@ static int set_rcvarray_entry(struct hfi1_filedata *fd, struct tid_user_buf *tbuf, u32 rcventry, struct tid_group *grp, u16 pageidx, unsigned int npages); -static int tid_rb_insert(void *arg, struct mmu_rb_node *node); static void cacheless_tid_rb_remove(struct hfi1_filedata *fdata, struct tid_rb_node *tnode); -static void tid_rb_remove(void *arg, struct mmu_rb_node *node); -static int tid_rb_invalidate(void *arg, struct mmu_rb_node *mnode); +static bool tid_rb_invalidate(struct mmu_interval_notifier *mni, + const struct mmu_notifier_range *range, + unsigned long cur_seq); static int program_rcvarray(struct hfi1_filedata *fd, struct tid_user_buf *, struct tid_group *grp, unsigned int start, u16 count, @@ -73,10 +73,8 @@ static int unprogram_rcvarray(struct hfi1_filedata *fd, u32 tidinfo, struct tid_group **grp); static void clear_tid_node(struct hfi1_filedata *fd, struct tid_rb_node *node);
-static struct mmu_rb_ops tid_rb_ops = { - .insert = tid_rb_insert, - .remove = tid_rb_remove, - .invalidate = tid_rb_invalidate +static const struct mmu_interval_notifier_ops tid_mn_ops = { + .invalidate = tid_rb_invalidate, };
/* @@ -87,7 +85,6 @@ static struct mmu_rb_ops tid_rb_ops = { int hfi1_user_exp_rcv_init(struct hfi1_filedata *fd, struct hfi1_ctxtdata *uctxt) { - struct hfi1_devdata *dd = uctxt->dd; int ret = 0;
spin_lock_init(&fd->tid_lock); @@ -109,20 +106,7 @@ int hfi1_user_exp_rcv_init(struct hfi1_filedata *fd, fd->entry_to_rb = NULL; return -ENOMEM; } - - /* - * Register MMU notifier callbacks. If the registration - * fails, continue without TID caching for this context. - */ - ret = hfi1_mmu_rb_register(fd, fd->mm, &tid_rb_ops, - dd->pport->hfi1_wq, - &fd->handler); - if (ret) { - dd_dev_info(dd, - "Failed MMU notifier registration %d\n", - ret); - ret = 0; - } + fd->use_mn = true; }
/* @@ -139,7 +123,7 @@ int hfi1_user_exp_rcv_init(struct hfi1_filedata *fd, * init. */ spin_lock(&fd->tid_lock); - if (uctxt->subctxt_cnt && fd->handler) { + if (uctxt->subctxt_cnt && fd->use_mn) { u16 remainder;
fd->tid_limit = uctxt->expected_count / uctxt->subctxt_cnt; @@ -158,18 +142,10 @@ void hfi1_user_exp_rcv_free(struct hfi1_filedata *fd) { struct hfi1_ctxtdata *uctxt = fd->uctxt;
- /* - * The notifier would have been removed when the process'es mm - * was freed. - */ - if (fd->handler) { - hfi1_mmu_rb_unregister(fd->handler); - } else { - if (!EXP_TID_SET_EMPTY(uctxt->tid_full_list)) - unlock_exp_tids(uctxt, &uctxt->tid_full_list, fd); - if (!EXP_TID_SET_EMPTY(uctxt->tid_used_list)) - unlock_exp_tids(uctxt, &uctxt->tid_used_list, fd); - } + if (!EXP_TID_SET_EMPTY(uctxt->tid_full_list)) + unlock_exp_tids(uctxt, &uctxt->tid_full_list, fd); + if (!EXP_TID_SET_EMPTY(uctxt->tid_used_list)) + unlock_exp_tids(uctxt, &uctxt->tid_used_list, fd);
kfree(fd->invalid_tids); fd->invalid_tids = NULL; @@ -201,7 +177,7 @@ static void unpin_rcv_pages(struct hfi1_filedata *fd,
if (mapped) { pci_unmap_single(dd->pcidev, node->dma_addr, - node->mmu.len, PCI_DMA_FROMDEVICE); + node->npages * PAGE_SIZE, PCI_DMA_FROMDEVICE); pages = &node->pages[idx]; } else { pages = &tidbuf->pages[idx]; @@ -777,8 +753,8 @@ static int set_rcvarray_entry(struct hfi1_filedata *fd, return -EFAULT; }
- node->mmu.addr = tbuf->vaddr + (pageidx * PAGE_SIZE); - node->mmu.len = npages * PAGE_SIZE; + node->notifier.ops = &tid_mn_ops; + node->fdata = fd; node->phys = page_to_phys(pages[0]); node->npages = npages; node->rcventry = rcventry; @@ -787,23 +763,34 @@ static int set_rcvarray_entry(struct hfi1_filedata *fd, node->freed = false; memcpy(node->pages, pages, sizeof(struct page *) * npages);
- if (!fd->handler) - ret = tid_rb_insert(fd, &node->mmu); - else - ret = hfi1_mmu_rb_insert(fd->handler, &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; + if (fd->use_mn) { + ret = mmu_interval_notifier_insert( + &node->notifier, tbuf->vaddr + (pageidx * PAGE_SIZE), + npages * PAGE_SIZE, fd->mm); + if (ret) + goto out_unmap; + /* + * FIXME: This is in the wrong order, the notifier should be + * established before the pages are pinned by pin_rcv_pages. + */ + mmu_interval_read_begin(&node->notifier); } + fd->entry_to_rb[node->rcventry - uctxt->expected_base] = node; + 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); + node->notifier.interval_tree.start, node->phys, + phys); return 0; + +out_unmap: + hfi1_cdbg(TID, "Failed to insert RB node %u 0x%lx, 0x%lx %d", + node->rcventry, node->notifier.interval_tree.start, + node->phys, ret); + pci_unmap_single(dd->pcidev, phys, npages * PAGE_SIZE, + PCI_DMA_FROMDEVICE); + kfree(node); + return -EFAULT; }
static int unprogram_rcvarray(struct hfi1_filedata *fd, u32 tidinfo, @@ -833,10 +820,9 @@ static int unprogram_rcvarray(struct hfi1_filedata *fd, u32 tidinfo, if (grp) *grp = node->grp;
- if (!fd->handler) - cacheless_tid_rb_remove(fd, node); - else - hfi1_mmu_rb_remove(fd->handler, &node->mmu); + if (fd->use_mn) + mmu_interval_notifier_remove(&node->notifier); + cacheless_tid_rb_remove(fd, node);
return 0; } @@ -847,7 +833,8 @@ static void clear_tid_node(struct hfi1_filedata *fd, struct tid_rb_node *node) 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->npages, + node->notifier.interval_tree.start, node->phys, node->dma_addr);
/* @@ -894,30 +881,29 @@ static void unlock_exp_tids(struct hfi1_ctxtdata *uctxt, if (!node || node->rcventry != rcventry) continue;
+ if (fd->use_mn) + mmu_interval_notifier_remove( + &node->notifier); cacheless_tid_rb_remove(fd, node); } } } }
-/* - * Always return 0 from this function. A non-zero return indicates that the - * remove operation will be called and that memory should be unpinned. - * However, the driver cannot unpin out from under PSM. Instead, retain the - * memory (by returning 0) and inform PSM that the memory is going away. PSM - * will call back later when it has removed the memory from its list. - */ -static int tid_rb_invalidate(void *arg, struct mmu_rb_node *mnode) +static bool tid_rb_invalidate(struct mmu_interval_notifier *mni, + const struct mmu_notifier_range *range, + unsigned long cur_seq) { - struct hfi1_filedata *fdata = arg; - struct hfi1_ctxtdata *uctxt = fdata->uctxt; struct tid_rb_node *node = - container_of(mnode, struct tid_rb_node, mmu); + container_of(mni, struct tid_rb_node, notifier); + struct hfi1_filedata *fdata = node->fdata; + struct hfi1_ctxtdata *uctxt = fdata->uctxt;
if (node->freed) - return 0; + return true;
- trace_hfi1_exp_tid_inval(uctxt->ctxt, fdata->subctxt, node->mmu.addr, + trace_hfi1_exp_tid_inval(uctxt->ctxt, fdata->subctxt, + node->notifier.interval_tree.start, node->rcventry, node->npages, node->dma_addr); node->freed = true;
@@ -946,18 +932,7 @@ static int tid_rb_invalidate(void *arg, struct mmu_rb_node *mnode) fdata->invalid_tid_idx++; } spin_unlock(&fdata->invalid_lock); - return 0; -} - -static int tid_rb_insert(void *arg, struct mmu_rb_node *node) -{ - struct hfi1_filedata *fdata = arg; - 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; + return true; }
static void cacheless_tid_rb_remove(struct hfi1_filedata *fdata, @@ -968,12 +943,3 @@ static void cacheless_tid_rb_remove(struct hfi1_filedata *fdata, fdata->entry_to_rb[tnode->rcventry - base] = NULL; clear_tid_node(fdata, tnode); } - -static void tid_rb_remove(void *arg, struct mmu_rb_node *node) -{ - struct hfi1_filedata *fdata = arg; - struct tid_rb_node *tnode = - container_of(node, struct tid_rb_node, mmu); - - cacheless_tid_rb_remove(fdata, tnode); -} diff --git a/drivers/infiniband/hw/hfi1/user_exp_rcv.h b/drivers/infiniband/hw/hfi1/user_exp_rcv.h index 43b105de1d5427..6257eee083a1a3 100644 --- a/drivers/infiniband/hw/hfi1/user_exp_rcv.h +++ b/drivers/infiniband/hw/hfi1/user_exp_rcv.h @@ -65,7 +65,8 @@ struct tid_user_buf { };
struct tid_rb_node { - struct mmu_rb_node mmu; + struct mmu_interval_notifier notifier; + struct hfi1_filedata *fdata; unsigned long phys; struct tid_group *grp; u32 rcventry;