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authorSagi Grimberg <sagig@mellanox.com>2014-12-11 17:04:16 +0200
committerRoland Dreier <roland@purestorage.com>2014-12-15 18:13:35 -0800
commit860f10a799c83e38a69d5a69d80da5312a4c4106 (patch)
tree32bc827e3535988397e99b11f9db5c429c09511f /drivers/infiniband/core
parent5a77abf9a97a7ecc8fb0f6bf4ad411fb12b02f31 (diff)
IB/core: Add flags for on demand paging support
* Add a configuration option for enable on-demand paging support in the infiniband subsystem (CONFIG_INFINIBAND_ON_DEMAND_PAGING). In a later patch, this configuration option will select the MMU_NOTIFIER configuration option to enable mmu notifiers. * Add a flag for on demand paging (ODP) support in the IB device capabilities. * Add a flag to request ODP MR in the access flags to reg_mr. * Fail registrations done with the ODP flag when the low-level driver doesn't support this. * Change the conditions in which an MR will be writable to explicitly specify the access flags. This is to avoid making an MR writable just because it is an ODP MR. * Add a ODP capabilities to the extended query device verb. Signed-off-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Shachar Raindel <raindel@mellanox.com> Signed-off-by: Haggai Eran <haggaie@mellanox.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/core')
-rw-r--r--drivers/infiniband/core/umem.c8
-rw-r--r--drivers/infiniband/core/uverbs_cmd.c25
2 files changed, 30 insertions, 3 deletions
diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index 6f152628e0d2..c328e4693d14 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -107,13 +107,15 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
umem->page_size = PAGE_SIZE;
umem->pid = get_task_pid(current, PIDTYPE_PID);
/*
- * We ask for writable memory if any access flags other than
- * "remote read" are set. "Local write" and "remote write"
+ * We ask for writable memory if any of the following
+ * access flags are set. "Local write" and "remote write"
* obviously require write access. "Remote atomic" can do
* things like fetch and add, which will modify memory, and
* "MW bind" can change permissions by binding a window.
*/
- umem->writable = !!(access & ~IB_ACCESS_REMOTE_READ);
+ umem->writable = !!(access &
+ (IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_WRITE |
+ IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_MW_BIND));
/* We assume the memory is from hugetlb until proved otherwise */
umem->hugetlb = 1;
diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index c7a43624c96b..f9326ccda4b5 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -953,6 +953,18 @@ ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
goto err_free;
}
+ if (cmd.access_flags & IB_ACCESS_ON_DEMAND) {
+ struct ib_device_attr attr;
+
+ ret = ib_query_device(pd->device, &attr);
+ if (ret || !(attr.device_cap_flags &
+ IB_DEVICE_ON_DEMAND_PAGING)) {
+ pr_debug("ODP support not available\n");
+ ret = -EINVAL;
+ goto err_put;
+ }
+ }
+
mr = pd->device->reg_user_mr(pd, cmd.start, cmd.length, cmd.hca_va,
cmd.access_flags, &udata);
if (IS_ERR(mr)) {
@@ -3289,6 +3301,19 @@ int ib_uverbs_ex_query_device(struct ib_uverbs_file *file,
copy_query_dev_fields(file, &resp.base, &attr);
resp.comp_mask = 0;
+#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
+ if (cmd.comp_mask & IB_USER_VERBS_EX_QUERY_DEVICE_ODP) {
+ resp.odp_caps.general_caps = attr.odp_caps.general_caps;
+ resp.odp_caps.per_transport_caps.rc_odp_caps =
+ attr.odp_caps.per_transport_caps.rc_odp_caps;
+ resp.odp_caps.per_transport_caps.uc_odp_caps =
+ attr.odp_caps.per_transport_caps.uc_odp_caps;
+ resp.odp_caps.per_transport_caps.ud_odp_caps =
+ attr.odp_caps.per_transport_caps.ud_odp_caps;
+ resp.comp_mask |= IB_USER_VERBS_EX_QUERY_DEVICE_ODP;
+ }
+#endif
+
err = ib_copy_to_udata(ucore, &resp, sizeof(resp));
if (err)
return err;