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Message-Id: <7d8595c23e954e0fdc19b14e95da13ceef2adafd.1684397037.git.matsuda-daisuke@fujitsu.com>
Date: Thu, 18 May 2023 17:21:50 +0900
From: Daisuke Matsuda <matsuda-daisuke@...itsu.com>
To: linux-rdma@...r.kernel.org, leonro@...dia.com, jgg@...dia.com,
zyjzyj2000@...il.com
Cc: linux-kernel@...r.kernel.org, rpearsonhpe@...il.com,
yangx.jy@...itsu.com, lizhijian@...itsu.com, y-goto@...itsu.com,
Daisuke Matsuda <matsuda-daisuke@...itsu.com>
Subject: [PATCH for-next v5 5/7] RDMA/rxe: Allow registering MRs for On-Demand Paging
Allow applications to register an ODP-enabled MR, in which case the flag
IB_ACCESS_ON_DEMAND is passed to rxe_reg_user_mr(). However, there is no
RDMA operation supported right now. They will be enabled later in the
subsequent two patches.
rxe_odp_do_pagefault() is called to initialize an ODP-enabled MR. It syncs
process address space from the CPU page table to the driver page table
(dma_list/pfn_list in umem_odp) when called with RXE_PAGEFAULT_SNAPSHOT
flag. Additionally, It can be used to trigger page fault when pages being
accessed are not present or do not have proper read/write permissions, and
possibly to prefetch pages in the future.
Signed-off-by: Daisuke Matsuda <matsuda-daisuke@...itsu.com>
---
drivers/infiniband/sw/rxe/rxe.c | 7 ++
drivers/infiniband/sw/rxe/rxe_loc.h | 14 +++
drivers/infiniband/sw/rxe/rxe_mr.c | 9 +-
drivers/infiniband/sw/rxe/rxe_odp.c | 120 ++++++++++++++++++++++++++
drivers/infiniband/sw/rxe/rxe_resp.c | 15 +++-
drivers/infiniband/sw/rxe/rxe_verbs.c | 5 +-
drivers/infiniband/sw/rxe/rxe_verbs.h | 2 +
7 files changed, 166 insertions(+), 6 deletions(-)
diff --git a/drivers/infiniband/sw/rxe/rxe.c b/drivers/infiniband/sw/rxe/rxe.c
index 54c723a6edda..f2284d27229b 100644
--- a/drivers/infiniband/sw/rxe/rxe.c
+++ b/drivers/infiniband/sw/rxe/rxe.c
@@ -73,6 +73,13 @@ static void rxe_init_device_param(struct rxe_dev *rxe)
rxe->ndev->dev_addr);
rxe->max_ucontext = RXE_MAX_UCONTEXT;
+
+ if (IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING)) {
+ rxe->attr.kernel_cap_flags |= IBK_ON_DEMAND_PAGING;
+
+ /* IB_ODP_SUPPORT_IMPLICIT is not supported right now. */
+ rxe->attr.odp_caps.general_caps |= IB_ODP_SUPPORT;
+ }
}
/* initialize port attributes */
diff --git a/drivers/infiniband/sw/rxe/rxe_loc.h b/drivers/infiniband/sw/rxe/rxe_loc.h
index 00fedd1a4980..93247d123642 100644
--- a/drivers/infiniband/sw/rxe/rxe_loc.h
+++ b/drivers/infiniband/sw/rxe/rxe_loc.h
@@ -202,4 +202,18 @@ static inline unsigned int wr_opcode_mask(int opcode, struct rxe_qp *qp)
return rxe_wr_opcode_info[opcode].mask[qp->ibqp.qp_type];
}
+/* rxe_odp.c */
+#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
+int rxe_odp_mr_init_user(struct rxe_dev *rxe, u64 start, u64 length,
+ u64 iova, int access_flags, struct rxe_mr *mr);
+#else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
+static inline int
+rxe_odp_mr_init_user(struct rxe_dev *rxe, u64 start, u64 length, u64 iova,
+ int access_flags, struct rxe_mr *mr)
+{
+ return -EOPNOTSUPP;
+}
+
+#endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
+
#endif /* RXE_LOC_H */
diff --git a/drivers/infiniband/sw/rxe/rxe_mr.c b/drivers/infiniband/sw/rxe/rxe_mr.c
index ffbac6f5e828..cd368cd096c8 100644
--- a/drivers/infiniband/sw/rxe/rxe_mr.c
+++ b/drivers/infiniband/sw/rxe/rxe_mr.c
@@ -318,7 +318,10 @@ int rxe_mr_copy(struct rxe_mr *mr, u64 iova, void *addr,
return err;
}
- return rxe_mr_copy_xarray(mr, iova, addr, length, dir);
+ if (mr->odp_enabled)
+ return -EOPNOTSUPP;
+ else
+ return rxe_mr_copy_xarray(mr, iova, addr, length, dir);
}
/* copy data in or out of a wqe, i.e. sg list
@@ -527,6 +530,10 @@ int rxe_mr_do_atomic_write(struct rxe_mr *mr, u64 iova, u64 value)
struct page *page;
u64 *va;
+ /* ODP is not supported right now. WIP. */
+ if (mr->odp_enabled)
+ return RESPST_ERR_UNSUPPORTED_OPCODE;
+
/* See IBA oA19-28 */
if (unlikely(mr->state != RXE_MR_STATE_VALID)) {
rxe_dbg_mr(mr, "mr not in valid state");
diff --git a/drivers/infiniband/sw/rxe/rxe_odp.c b/drivers/infiniband/sw/rxe/rxe_odp.c
index b69b25e0fef6..e5497d09c399 100644
--- a/drivers/infiniband/sw/rxe/rxe_odp.c
+++ b/drivers/infiniband/sw/rxe/rxe_odp.c
@@ -24,6 +24,24 @@ static void rxe_mr_unset_xarray(struct rxe_mr *mr, unsigned long start,
spin_unlock(&mr->page_list.xa_lock);
}
+static void rxe_mr_set_xarray(struct rxe_mr *mr, unsigned long start,
+ unsigned long end, unsigned long *pfn_list)
+{
+ unsigned long lower, upper, idx;
+ struct page *page;
+
+ lower = rxe_mr_iova_to_index(mr, start);
+ upper = rxe_mr_iova_to_index(mr, end);
+
+ /* make pages visible in xarray. no sleep while taking the lock */
+ spin_lock(&mr->page_list.xa_lock);
+ for (idx = lower; idx <= upper; idx++) {
+ page = hmm_pfn_to_page(pfn_list[idx]);
+ __xa_store(&mr->page_list, idx, page, GFP_ATOMIC);
+ }
+ spin_unlock(&mr->page_list.xa_lock);
+}
+
static bool rxe_ib_invalidate_range(struct mmu_interval_notifier *mni,
const struct mmu_notifier_range *range,
unsigned long cur_seq)
@@ -54,3 +72,105 @@ static bool rxe_ib_invalidate_range(struct mmu_interval_notifier *mni,
const struct mmu_interval_notifier_ops rxe_mn_ops = {
.invalidate = rxe_ib_invalidate_range,
};
+
+#define RXE_PAGEFAULT_RDONLY BIT(1)
+#define RXE_PAGEFAULT_SNAPSHOT BIT(2)
+static int rxe_odp_do_pagefault(struct rxe_mr *mr, u64 user_va, int bcnt, u32 flags)
+{
+ int np;
+ u64 access_mask;
+ bool fault = !(flags & RXE_PAGEFAULT_SNAPSHOT);
+ struct ib_umem_odp *umem_odp = to_ib_umem_odp(mr->umem);
+
+ access_mask = ODP_READ_ALLOWED_BIT;
+ if (umem_odp->umem.writable && !(flags & RXE_PAGEFAULT_RDONLY))
+ access_mask |= ODP_WRITE_ALLOWED_BIT;
+
+ /*
+ * ib_umem_odp_map_dma_and_lock() locks umem_mutex on success.
+ * Callers must release the lock later to let invalidation handler
+ * do its work again.
+ */
+ np = ib_umem_odp_map_dma_and_lock(umem_odp, user_va, bcnt,
+ access_mask, fault);
+ if (np < 0)
+ return np;
+
+ /* umem_mutex is still locked here, so we can use hmm_pfn_to_page()
+ * safely to fetch pages in the range.
+ */
+ rxe_mr_set_xarray(mr, user_va, user_va + bcnt, umem_odp->pfn_list);
+
+ return np;
+}
+
+static int rxe_odp_init_pages(struct rxe_mr *mr)
+{
+ int ret;
+ struct ib_umem_odp *umem_odp = to_ib_umem_odp(mr->umem);
+
+ ret = rxe_odp_do_pagefault(mr, mr->umem->address, mr->umem->length,
+ RXE_PAGEFAULT_SNAPSHOT);
+
+ if (ret >= 0)
+ mutex_unlock(&umem_odp->umem_mutex);
+
+ return ret >= 0 ? 0 : ret;
+}
+
+int rxe_odp_mr_init_user(struct rxe_dev *rxe, u64 start, u64 length,
+ u64 iova, int access_flags, struct rxe_mr *mr)
+{
+ int err;
+ struct ib_umem_odp *umem_odp;
+
+ if (!IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING))
+ return -EOPNOTSUPP;
+
+ rxe_mr_init(access_flags, mr);
+
+ xa_init(&mr->page_list);
+
+ if (!start && length == U64_MAX) {
+ if (iova != 0)
+ return -EINVAL;
+ if (!(rxe->attr.odp_caps.general_caps & IB_ODP_SUPPORT_IMPLICIT))
+ return -EINVAL;
+
+ /* Never reach here, for implicit ODP is not implemented. */
+ }
+
+ umem_odp = ib_umem_odp_get(&rxe->ib_dev, start, length, access_flags,
+ &rxe_mn_ops);
+ if (IS_ERR(umem_odp)) {
+ rxe_dbg_mr(mr, "Unable to create umem_odp err = %d\n",
+ (int)PTR_ERR(umem_odp));
+ return PTR_ERR(umem_odp);
+ }
+
+ umem_odp->private = mr;
+
+ mr->odp_enabled = true;
+ mr->umem = &umem_odp->umem;
+ mr->access = access_flags;
+ mr->ibmr.length = length;
+ mr->ibmr.iova = iova;
+ mr->page_offset = ib_umem_offset(&umem_odp->umem);
+
+ err = rxe_odp_init_pages(mr);
+ if (err) {
+ ib_umem_odp_release(umem_odp);
+ return err;
+ }
+
+ err = rxe_mr_fill_pages_from_sgt(mr, &umem_odp->umem.sgt_append.sgt);
+ if (err) {
+ ib_umem_odp_release(umem_odp);
+ return err;
+ }
+
+ mr->state = RXE_MR_STATE_VALID;
+ mr->ibmr.type = IB_MR_TYPE_USER;
+
+ return err;
+}
diff --git a/drivers/infiniband/sw/rxe/rxe_resp.c b/drivers/infiniband/sw/rxe/rxe_resp.c
index ba0222bfce9e..90c31c4f2944 100644
--- a/drivers/infiniband/sw/rxe/rxe_resp.c
+++ b/drivers/infiniband/sw/rxe/rxe_resp.c
@@ -626,6 +626,10 @@ static enum resp_states process_flush(struct rxe_qp *qp,
struct rxe_mr *mr = qp->resp.mr;
struct resp_res *res = qp->resp.res;
+ /* ODP is not supported right now. WIP. */
+ if (mr->odp_enabled)
+ return RESPST_ERR_UNSUPPORTED_OPCODE;
+
/* oA19-14, oA19-15 */
if (res && res->replay)
return RESPST_ACKNOWLEDGE;
@@ -679,10 +683,13 @@ static enum resp_states atomic_reply(struct rxe_qp *qp,
if (!res->replay) {
u64 iova = qp->resp.va + qp->resp.offset;
- err = rxe_mr_do_atomic_op(mr, iova, pkt->opcode,
- atmeth_comp(pkt),
- atmeth_swap_add(pkt),
- &res->atomic.orig_val);
+ if (mr->odp_enabled)
+ err = RESPST_ERR_UNSUPPORTED_OPCODE;
+ else
+ err = rxe_mr_do_atomic_op(mr, iova, pkt->opcode,
+ atmeth_comp(pkt),
+ atmeth_swap_add(pkt),
+ &res->atomic.orig_val);
if (err)
return err;
diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c
index dea605b7f683..9c23defdc7b5 100644
--- a/drivers/infiniband/sw/rxe/rxe_verbs.c
+++ b/drivers/infiniband/sw/rxe/rxe_verbs.c
@@ -1274,7 +1274,10 @@ static struct ib_mr *rxe_reg_user_mr(struct ib_pd *ibpd, u64 start,
mr->ibmr.pd = ibpd;
mr->ibmr.device = ibpd->device;
- err = rxe_mr_init_user(rxe, start, length, iova, access, mr);
+ if (access & IB_ACCESS_ON_DEMAND)
+ err = rxe_odp_mr_init_user(rxe, start, length, iova, access, mr);
+ else
+ err = rxe_mr_init_user(rxe, start, length, iova, access, mr);
if (err) {
rxe_dbg_mr(mr, "reg_user_mr failed, err = %d", err);
goto err_cleanup;
diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.h b/drivers/infiniband/sw/rxe/rxe_verbs.h
index b6fbd9b3d086..de5a982c7c7e 100644
--- a/drivers/infiniband/sw/rxe/rxe_verbs.h
+++ b/drivers/infiniband/sw/rxe/rxe_verbs.h
@@ -333,6 +333,8 @@ struct rxe_mr {
u32 nbuf;
struct xarray page_list;
+
+ bool odp_enabled;
};
static inline unsigned int mr_page_size(struct rxe_mr *mr)
--
2.39.1
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