#include <linux/pid_namespace.h>
#include "cma_priv.h"
+#include "restrack.h"
-static int fill_res_noop(struct sk_buff *msg,
- struct rdma_restrack_entry *entry)
+/**
+ * rdma_restrack_init() - initialize and allocate resource tracking
+ * @dev: IB device
+ *
+ * Return: 0 on success
+ */
+int rdma_restrack_init(struct ib_device *dev)
{
- return 0;
-}
+ struct rdma_restrack_root *rt;
+ int i;
-void rdma_restrack_init(struct rdma_restrack_root *res)
-{
- init_rwsem(&res->rwsem);
- res->fill_res_entry = fill_res_noop;
+ dev->res = kcalloc(RDMA_RESTRACK_MAX, sizeof(*rt), GFP_KERNEL);
+ if (!dev->res)
+ return -ENOMEM;
+
+ rt = dev->res;
+
+ for (i = 0; i < RDMA_RESTRACK_MAX; i++)
+ xa_init_flags(&rt[i].xa, XA_FLAGS_ALLOC);
+
+ return 0;
}
static const char *type2str(enum rdma_restrack_type type)
return names[type];
};
-void rdma_restrack_clean(struct rdma_restrack_root *res)
+/**
+ * rdma_restrack_clean() - clean resource tracking
+ * @dev: IB device
+ */
+void rdma_restrack_clean(struct ib_device *dev)
{
+ struct rdma_restrack_root *rt = dev->res;
struct rdma_restrack_entry *e;
char buf[TASK_COMM_LEN];
- struct ib_device *dev;
+ bool found = false;
const char *owner;
- int bkt;
-
- if (hash_empty(res->hash))
- return;
-
- dev = container_of(res, struct ib_device, res);
- pr_err("restrack: %s", CUT_HERE);
- dev_err(&dev->dev, "BUG: RESTRACK detected leak of resources\n");
- hash_for_each(res->hash, bkt, e, node) {
- if (rdma_is_kernel_res(e)) {
- owner = e->kern_name;
- } else {
- /*
- * There is no need to call get_task_struct here,
- * because we can be here only if there are more
- * get_task_struct() call than put_task_struct().
- */
- get_task_comm(buf, e->task);
- owner = buf;
+ int i;
+
+ for (i = 0 ; i < RDMA_RESTRACK_MAX; i++) {
+ struct xarray *xa = &dev->res[i].xa;
+
+ if (!xa_empty(xa)) {
+ unsigned long index;
+
+ if (!found) {
+ pr_err("restrack: %s", CUT_HERE);
+ dev_err(&dev->dev, "BUG: RESTRACK detected leak of resources\n");
+ }
+ xa_for_each(xa, index, e) {
+ if (rdma_is_kernel_res(e)) {
+ owner = e->kern_name;
+ } else {
+ /*
+ * There is no need to call get_task_struct here,
+ * because we can be here only if there are more
+ * get_task_struct() call than put_task_struct().
+ */
+ get_task_comm(buf, e->task);
+ owner = buf;
+ }
+
+ pr_err("restrack: %s %s object allocated by %s is not freed\n",
+ rdma_is_kernel_res(e) ? "Kernel" :
+ "User",
+ type2str(e->type), owner);
+ }
+ found = true;
}
-
- pr_err("restrack: %s %s object allocated by %s is not freed\n",
- rdma_is_kernel_res(e) ? "Kernel" : "User",
- type2str(e->type), owner);
+ xa_destroy(xa);
}
- pr_err("restrack: %s", CUT_HERE);
+ if (found)
+ pr_err("restrack: %s", CUT_HERE);
+
+ kfree(rt);
}
-int rdma_restrack_count(struct rdma_restrack_root *res,
- enum rdma_restrack_type type,
+/**
+ * rdma_restrack_count() - the current usage of specific object
+ * @dev: IB device
+ * @type: actual type of object to operate
+ * @ns: PID namespace
+ */
+int rdma_restrack_count(struct ib_device *dev, enum rdma_restrack_type type,
struct pid_namespace *ns)
{
+ struct rdma_restrack_root *rt = &dev->res[type];
struct rdma_restrack_entry *e;
+ XA_STATE(xas, &rt->xa, 0);
u32 cnt = 0;
- down_read(&res->rwsem);
- hash_for_each_possible(res->hash, e, node, type) {
+ xa_lock(&rt->xa);
+ xas_for_each(&xas, e, U32_MAX) {
if (ns == &init_pid_ns ||
(!rdma_is_kernel_res(e) &&
ns == task_active_pid_ns(e->task)))
cnt++;
}
- up_read(&res->rwsem);
+ xa_unlock(&rt->xa);
return cnt;
}
EXPORT_SYMBOL(rdma_restrack_count);
static void rdma_restrack_add(struct rdma_restrack_entry *res)
{
struct ib_device *dev = res_to_dev(res);
+ struct rdma_restrack_root *rt;
+ int ret;
if (!dev)
return;
- if (res->type != RDMA_RESTRACK_CM_ID || rdma_is_kernel_res(res))
- res->task = NULL;
-
- if (!rdma_is_kernel_res(res)) {
- if (!res->task)
- rdma_restrack_set_task(res, NULL);
- res->kern_name = NULL;
- } else {
- set_kern_name(res);
- }
+ rt = &dev->res[res->type];
kref_init(&res->kref);
init_completion(&res->comp);
- res->valid = true;
+ if (res->type != RDMA_RESTRACK_QP)
+ ret = xa_alloc_cyclic(&rt->xa, &res->id, res, xa_limit_32b,
+ &rt->next_id, GFP_KERNEL);
+ else {
+ /* Special case to ensure that LQPN points to right QP */
+ struct ib_qp *qp = container_of(res, struct ib_qp, res);
+
+ ret = xa_insert(&rt->xa, qp->qp_num, res, GFP_KERNEL);
+ res->id = ret ? 0 : qp->qp_num;
+ }
- down_write(&dev->res.rwsem);
- hash_add(dev->res.hash, &res->node, res->type);
- up_write(&dev->res.rwsem);
+ if (!ret)
+ res->valid = true;
}
/**
*/
void rdma_restrack_kadd(struct rdma_restrack_entry *res)
{
+ res->task = NULL;
+ set_kern_name(res);
res->user = false;
rdma_restrack_add(res);
}
*/
void rdma_restrack_uadd(struct rdma_restrack_entry *res)
{
+ if (res->type != RDMA_RESTRACK_CM_ID)
+ res->task = NULL;
+
+ if (!res->task)
+ rdma_restrack_set_task(res, NULL);
+ res->kern_name = NULL;
+
res->user = true;
rdma_restrack_add(res);
}
}
EXPORT_SYMBOL(rdma_restrack_get);
+/**
+ * rdma_restrack_get_byid() - translate from ID to restrack object
+ * @dev: IB device
+ * @type: resource track type
+ * @id: ID to take a look
+ *
+ * Return: Pointer to restrack entry or -ENOENT in case of error.
+ */
+struct rdma_restrack_entry *
+rdma_restrack_get_byid(struct ib_device *dev,
+ enum rdma_restrack_type type, u32 id)
+{
+ struct rdma_restrack_root *rt = &dev->res[type];
+ struct rdma_restrack_entry *res;
+
+ xa_lock(&rt->xa);
+ res = xa_load(&rt->xa, id);
+ if (!res || !rdma_restrack_get(res))
+ res = ERR_PTR(-ENOENT);
+ xa_unlock(&rt->xa);
+
+ return res;
+}
+EXPORT_SYMBOL(rdma_restrack_get_byid);
+
static void restrack_release(struct kref *kref)
{
struct rdma_restrack_entry *res;
void rdma_restrack_del(struct rdma_restrack_entry *res)
{
+ struct rdma_restrack_entry *old;
+ struct rdma_restrack_root *rt;
struct ib_device *dev;
if (!res->valid)
goto out;
dev = res_to_dev(res);
- if (!dev)
+ if (WARN_ON(!dev))
return;
- rdma_restrack_put(res);
-
- wait_for_completion(&res->comp);
+ rt = &dev->res[res->type];
- down_write(&dev->res.rwsem);
- hash_del(&res->node);
+ old = xa_erase(&rt->xa, res->id);
+ WARN_ON(old != res);
res->valid = false;
- up_write(&dev->res.rwsem);
+
+ rdma_restrack_put(res);
+ wait_for_completion(&res->comp);
out:
if (res->task) {
projects / linux-2.6-block.git / blobdiff