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IB/core: Add flags for on demand paging support

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* 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 <[email protected]>
Signed-off-by: Shachar Raindel <[email protected]>
Signed-off-by: Haggai Eran <[email protected]>
Signed-off-by: Roland Dreier <[email protected]>
This commit is contained in:
Sagi Grimberg 2014-12-11 17:04:16 +02:00 • committed by Roland Dreier
commit 860f10a799
5 changed files with 81 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

10
drivers/infiniband/Kconfig
View file

@ -38,6 +38,16 @@ config INFINIBAND_USER_MEM
depends on INFINIBAND_USER_ACCESS != n
default y
config INFINIBAND_ON_DEMAND_PAGING
bool "InfiniBand on-demand paging support"
depends on INFINIBAND_USER_MEM
default y
---help---
On demand paging support for the InfiniBand subsystem.
Together with driver support this allows registration of
memory regions without pinning their pages, fetching the
pages on demand instead.
config INFINIBAND_ADDR_TRANS
bool
depends on INFINIBAND

8
drivers/infiniband/core/umem.c
View file

@ -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;

25
drivers/infiniband/core/uverbs_cmd.c
View file

@ -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;