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RDMA/uverbs: Add a method to introspect handles in a context

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Introduce a helper function gather_objects_handle() to copy object handles
under a spin lock.

Expose these objects handles via the uverbs ioctl interface.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
This commit is contained in:
Jason Gunthorpe 2018-11-30 13:16:47 +02:00
parent 350b4c8ac1
commit 149d3845f4
2 changed files with 95 additions and 1 deletions
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89
drivers/infiniband/core/uverbs_std_types_device.c
View File

@ -51,8 +51,95 @@ DECLARE_UVERBS_NAMED_METHOD(UVERBS_METHOD_INVOKE_WRITE,
UA_OPTIONAL),
UVERBS_ATTR_UHW());
static uint32_t *
gather_objects_handle(struct ib_uverbs_file *ufile,
const struct uverbs_api_object *uapi_object,
struct uverbs_attr_bundle *attrs,
ssize_t out_len,
u64 *total)
{
u64 max_count = out_len / sizeof(u32);
struct ib_uobject *obj;
u64 count = 0;
u32 *handles;
/* Allocated memory that cannot page out where we gather
* all object ids under a spin_lock.
*/
handles = uverbs_zalloc(attrs, out_len);
if (IS_ERR(handles))
return handles;
spin_lock_irq(&ufile->uobjects_lock);
list_for_each_entry(obj, &ufile->uobjects, list) {
u32 obj_id = obj->id;
if (obj->uapi_object != uapi_object)
continue;
if (count >= max_count)
break;
handles[count] = obj_id;
count++;
}
spin_unlock_irq(&ufile->uobjects_lock);
*total = count;
return handles;
}
static int UVERBS_HANDLER(UVERBS_METHOD_INFO_HANDLES)(
struct uverbs_attr_bundle *attrs)
{
const struct uverbs_api_object *uapi_object;
ssize_t out_len;
u64 total = 0;
u16 object_id;
u32 *handles;
int ret;
out_len = uverbs_attr_get_len(attrs, UVERBS_ATTR_INFO_HANDLES_LIST);
if (out_len <= 0 || (out_len % sizeof(u32) != 0))
return -EINVAL;
ret = uverbs_get_const(&object_id, attrs, UVERBS_ATTR_INFO_OBJECT_ID);
if (ret)
return ret;
uapi_object = uapi_get_object(attrs->ufile->device->uapi, object_id);
if (!uapi_object)
return -EINVAL;
handles = gather_objects_handle(attrs->ufile, uapi_object, attrs,
out_len, &total);
if (IS_ERR(handles))
return PTR_ERR(handles);
ret = uverbs_copy_to(attrs, UVERBS_ATTR_INFO_HANDLES_LIST, handles,
sizeof(u32) * total);
if (ret)
goto err;
ret = uverbs_copy_to(attrs, UVERBS_ATTR_INFO_TOTAL_HANDLES, &total,
sizeof(total));
err:
return ret;
}
DECLARE_UVERBS_NAMED_METHOD(
UVERBS_METHOD_INFO_HANDLES,
/* Also includes any device specific object ids */
UVERBS_ATTR_CONST_IN(UVERBS_ATTR_INFO_OBJECT_ID,
enum uverbs_default_objects, UA_MANDATORY),
UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_INFO_TOTAL_HANDLES,
UVERBS_ATTR_TYPE(u32), UA_OPTIONAL),
UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_INFO_HANDLES_LIST,
UVERBS_ATTR_MIN_SIZE(sizeof(u32)), UA_OPTIONAL));
DECLARE_UVERBS_GLOBAL_METHODS(UVERBS_OBJECT_DEVICE,
&UVERBS_METHOD(UVERBS_METHOD_INVOKE_WRITE));
&UVERBS_METHOD(UVERBS_METHOD_INVOKE_WRITE),
&UVERBS_METHOD(UVERBS_METHOD_INFO_HANDLES));
const struct uapi_definition uverbs_def_obj_device[] = {
UAPI_DEF_CHAIN_OBJ_TREE_NAMED(UVERBS_OBJECT_DEVICE),

7
include/uapi/rdma/ib_user_ioctl_cmds.h
View File

@ -65,6 +65,7 @@ enum {
enum uverbs_methods_device {
UVERBS_METHOD_INVOKE_WRITE,
UVERBS_METHOD_INFO_HANDLES,
};
enum uverbs_attrs_invoke_write_cmd_attr_ids {
@ -167,4 +168,10 @@ enum uverbs_methods_actions_counters_ops {
UVERBS_METHOD_COUNTERS_READ,
};
enum uverbs_attrs_info_handles_id {
UVERBS_ATTR_INFO_OBJECT_ID,
UVERBS_ATTR_INFO_TOTAL_HANDLES,
UVERBS_ATTR_INFO_HANDLES_LIST,
};
#endif