[SRU][jammy][PATCH 3/6] RDMA/efa: Add support for dmabuf memory regions
Ian May
ian.may at canonical.com
Wed Oct 25 20:07:47 UTC 2023
From: Gal Pressman <galpress at amazon.com>
Buglink: https://bugs.launchpad.net/bugs/2040526
Implement a dmabuf importer for the EFA driver. As ODP is not supported,
the pinned dmabuf are used to prevent the move_notify callback from being
called.
Link: https://lore.kernel.org/r/20211012120903.96933-4-galpress@amazon.com
Signed-off-by: Gal Pressman <galpress at amazon.com>
Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
(cherry picked from commit 66f4817b5712eb8783916dc6c2005aac7e5e6928)
Signed-off-by: Tushar Dave <tdave at nvidia.com>
Signed-off-by: Ian May <ian.may at canonical.com>
---
drivers/infiniband/hw/efa/efa.h | 4 +
drivers/infiniband/hw/efa/efa_main.c | 1 +
drivers/infiniband/hw/efa/efa_verbs.c | 127 +++++++++++++++++++-------
3 files changed, 101 insertions(+), 31 deletions(-)
diff --git a/drivers/infiniband/hw/efa/efa.h b/drivers/infiniband/hw/efa/efa.h
index 87b1dadeb7fe..4d1cd3e27129 100644
--- a/drivers/infiniband/hw/efa/efa.h
+++ b/drivers/infiniband/hw/efa/efa.h
@@ -139,6 +139,10 @@ int efa_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
struct ib_mr *efa_reg_mr(struct ib_pd *ibpd, u64 start, u64 length,
u64 virt_addr, int access_flags,
struct ib_udata *udata);
+struct ib_mr *efa_reg_user_mr_dmabuf(struct ib_pd *ibpd, u64 start,
+ u64 length, u64 virt_addr,
+ int fd, int access_flags,
+ struct ib_udata *udata);
int efa_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata);
int efa_get_port_immutable(struct ib_device *ibdev, u32 port_num,
struct ib_port_immutable *immutable);
diff --git a/drivers/infiniband/hw/efa/efa_main.c b/drivers/infiniband/hw/efa/efa_main.c
index d6d48db86681..0af8149eefe8 100644
--- a/drivers/infiniband/hw/efa/efa_main.c
+++ b/drivers/infiniband/hw/efa/efa_main.c
@@ -266,6 +266,7 @@ static const struct ib_device_ops efa_dev_ops = {
.query_port = efa_query_port,
.query_qp = efa_query_qp,
.reg_user_mr = efa_reg_mr,
+ .reg_user_mr_dmabuf = efa_reg_user_mr_dmabuf,
INIT_RDMA_OBJ_SIZE(ib_ah, efa_ah, ibah),
INIT_RDMA_OBJ_SIZE(ib_cq, efa_cq, ibcq),
diff --git a/drivers/infiniband/hw/efa/efa_verbs.c b/drivers/infiniband/hw/efa/efa_verbs.c
index 1aab6c3e9f53..e9270e008754 100644
--- a/drivers/infiniband/hw/efa/efa_verbs.c
+++ b/drivers/infiniband/hw/efa/efa_verbs.c
@@ -3,6 +3,8 @@
* Copyright 2018-2021 Amazon.com, Inc. or its affiliates. All rights reserved.
*/
+#include <linux/dma-buf.h>
+#include <linux/dma-resv.h>
#include <linux/vmalloc.h>
#include <linux/log2.h>
@@ -1490,26 +1492,18 @@ static int efa_create_pbl(struct efa_dev *dev,
return 0;
}
-struct ib_mr *efa_reg_mr(struct ib_pd *ibpd, u64 start, u64 length,
- u64 virt_addr, int access_flags,
- struct ib_udata *udata)
+static struct efa_mr *efa_alloc_mr(struct ib_pd *ibpd, int access_flags,
+ struct ib_udata *udata)
{
struct efa_dev *dev = to_edev(ibpd->device);
- struct efa_com_reg_mr_params params = {};
- struct efa_com_reg_mr_result result = {};
- struct pbl_context pbl;
int supp_access_flags;
- unsigned int pg_sz;
struct efa_mr *mr;
- int inline_size;
- int err;
if (udata && udata->inlen &&
!ib_is_udata_cleared(udata, 0, sizeof(udata->inlen))) {
ibdev_dbg(&dev->ibdev,
"Incompatible ABI params, udata not cleared\n");
- err = -EINVAL;
- goto err_out;
+ return ERR_PTR(-EINVAL);
}
supp_access_flags =
@@ -1521,23 +1515,26 @@ struct ib_mr *efa_reg_mr(struct ib_pd *ibpd, u64 start, u64 length,
ibdev_dbg(&dev->ibdev,
"Unsupported access flags[%#x], supported[%#x]\n",
access_flags, supp_access_flags);
- err = -EOPNOTSUPP;
- goto err_out;
+ return ERR_PTR(-EOPNOTSUPP);
}
mr = kzalloc(sizeof(*mr), GFP_KERNEL);
- if (!mr) {
- err = -ENOMEM;
- goto err_out;
- }
+ if (!mr)
+ return ERR_PTR(-ENOMEM);
- mr->umem = ib_umem_get(ibpd->device, start, length, access_flags);
- if (IS_ERR(mr->umem)) {
- err = PTR_ERR(mr->umem);
- ibdev_dbg(&dev->ibdev,
- "Failed to pin and map user space memory[%d]\n", err);
- goto err_free;
- }
+ return mr;
+}
+
+static int efa_register_mr(struct ib_pd *ibpd, struct efa_mr *mr, u64 start,
+ u64 length, u64 virt_addr, int access_flags)
+{
+ struct efa_dev *dev = to_edev(ibpd->device);
+ struct efa_com_reg_mr_params params = {};
+ struct efa_com_reg_mr_result result = {};
+ struct pbl_context pbl;
+ unsigned int pg_sz;
+ int inline_size;
+ int err;
params.pd = to_epd(ibpd)->pdn;
params.iova = virt_addr;
@@ -1548,10 +1545,9 @@ struct ib_mr *efa_reg_mr(struct ib_pd *ibpd, u64 start, u64 length,
dev->dev_attr.page_size_cap,
virt_addr);
if (!pg_sz) {
- err = -EOPNOTSUPP;
ibdev_dbg(&dev->ibdev, "Failed to find a suitable page size in page_size_cap %#llx\n",
dev->dev_attr.page_size_cap);
- goto err_unmap;
+ return -EOPNOTSUPP;
}
params.page_shift = order_base_2(pg_sz);
@@ -1565,21 +1561,21 @@ struct ib_mr *efa_reg_mr(struct ib_pd *ibpd, u64 start, u64 length,
if (params.page_num <= inline_size) {
err = efa_create_inline_pbl(dev, mr, ¶ms);
if (err)
- goto err_unmap;
+ return err;
err = efa_com_register_mr(&dev->edev, ¶ms, &result);
if (err)
- goto err_unmap;
+ return err;
} else {
err = efa_create_pbl(dev, &pbl, mr, ¶ms);
if (err)
- goto err_unmap;
+ return err;
err = efa_com_register_mr(&dev->edev, ¶ms, &result);
pbl_destroy(dev, &pbl);
if (err)
- goto err_unmap;
+ return err;
}
mr->ibmr.lkey = result.l_key;
@@ -1587,9 +1583,78 @@ struct ib_mr *efa_reg_mr(struct ib_pd *ibpd, u64 start, u64 length,
mr->ibmr.length = length;
ibdev_dbg(&dev->ibdev, "Registered mr[%d]\n", mr->ibmr.lkey);
+ return 0;
+}
+
+struct ib_mr *efa_reg_user_mr_dmabuf(struct ib_pd *ibpd, u64 start,
+ u64 length, u64 virt_addr,
+ int fd, int access_flags,
+ struct ib_udata *udata)
+{
+ struct efa_dev *dev = to_edev(ibpd->device);
+ struct ib_umem_dmabuf *umem_dmabuf;
+ struct efa_mr *mr;
+ int err;
+
+ mr = efa_alloc_mr(ibpd, access_flags, udata);
+ if (IS_ERR(mr)) {
+ err = PTR_ERR(mr);
+ goto err_out;
+ }
+
+ umem_dmabuf = ib_umem_dmabuf_get_pinned(ibpd->device, start, length, fd,
+ access_flags);
+ if (IS_ERR(umem_dmabuf)) {
+ err = PTR_ERR(umem_dmabuf);
+ ibdev_dbg(&dev->ibdev, "Failed to get dmabuf umem[%d]\n", err);
+ goto err_free;
+ }
+
+ mr->umem = &umem_dmabuf->umem;
+ err = efa_register_mr(ibpd, mr, start, length, virt_addr, access_flags);
+ if (err)
+ goto err_release;
+
+ return &mr->ibmr;
+
+err_release:
+ ib_umem_release(mr->umem);
+err_free:
+ kfree(mr);
+err_out:
+ atomic64_inc(&dev->stats.reg_mr_err);
+ return ERR_PTR(err);
+}
+
+struct ib_mr *efa_reg_mr(struct ib_pd *ibpd, u64 start, u64 length,
+ u64 virt_addr, int access_flags,
+ struct ib_udata *udata)
+{
+ struct efa_dev *dev = to_edev(ibpd->device);
+ struct efa_mr *mr;
+ int err;
+
+ mr = efa_alloc_mr(ibpd, access_flags, udata);
+ if (IS_ERR(mr)) {
+ err = PTR_ERR(mr);
+ goto err_out;
+ }
+
+ mr->umem = ib_umem_get(ibpd->device, start, length, access_flags);
+ if (IS_ERR(mr->umem)) {
+ err = PTR_ERR(mr->umem);
+ ibdev_dbg(&dev->ibdev,
+ "Failed to pin and map user space memory[%d]\n", err);
+ goto err_free;
+ }
+
+ err = efa_register_mr(ibpd, mr, start, length, virt_addr, access_flags);
+ if (err)
+ goto err_release;
+
return &mr->ibmr;
-err_unmap:
+err_release:
ib_umem_release(mr->umem);
err_free:
kfree(mr);
--
2.25.1
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