[PATCH v3 06/14] RDMA/hfi1: Use mmu_interval_notifier_insert for user_exp_rcv
Jason Gunthorpe
jgg at ziepe.ca
Tue Nov 12 20:22:23 UTC 2019
From: Jason Gunthorpe <jgg at 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 at intel.com>
Signed-off-by: Jason Gunthorpe <jgg at 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;
--
2.24.0
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