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path: root/drivers/infiniband/sw/rdmavt/pd.c
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Diffstat (limited to 'drivers/infiniband/sw/rdmavt/pd.c')
-rw-r--r--drivers/infiniband/sw/rdmavt/pd.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/drivers/infiniband/sw/rdmavt/pd.c b/drivers/infiniband/sw/rdmavt/pd.c
new file mode 100644
index 0000000000..ae62071969
--- /dev/null
+++ b/drivers/infiniband/sw/rdmavt/pd.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
+/*
+ * Copyright(c) 2016 Intel Corporation.
+ */
+
+#include <linux/slab.h>
+#include "pd.h"
+
+/**
+ * rvt_alloc_pd - allocate a protection domain
+ * @ibpd: PD
+ * @udata: optional user data
+ *
+ * Allocate and keep track of a PD.
+ *
+ * Return: 0 on success
+ */
+int rvt_alloc_pd(struct ib_pd *ibpd, struct ib_udata *udata)
+{
+ struct ib_device *ibdev = ibpd->device;
+ struct rvt_dev_info *dev = ib_to_rvt(ibdev);
+ struct rvt_pd *pd = ibpd_to_rvtpd(ibpd);
+ int ret = 0;
+
+ /*
+ * While we could continue allocating protecetion domains, being
+ * constrained only by system resources. The IBTA spec defines that
+ * there is a max_pd limit that can be set and we need to check for
+ * that.
+ */
+
+ spin_lock(&dev->n_pds_lock);
+ if (dev->n_pds_allocated == dev->dparms.props.max_pd) {
+ spin_unlock(&dev->n_pds_lock);
+ ret = -ENOMEM;
+ goto bail;
+ }
+
+ dev->n_pds_allocated++;
+ spin_unlock(&dev->n_pds_lock);
+
+ /* ib_alloc_pd() will initialize pd->ibpd. */
+ pd->user = !!udata;
+
+bail:
+ return ret;
+}
+
+/**
+ * rvt_dealloc_pd - Free PD
+ * @ibpd: Free up PD
+ * @udata: Valid user data or NULL for kernel object
+ *
+ * Return: always 0
+ */
+int rvt_dealloc_pd(struct ib_pd *ibpd, struct ib_udata *udata)
+{
+ struct rvt_dev_info *dev = ib_to_rvt(ibpd->device);
+
+ spin_lock(&dev->n_pds_lock);
+ dev->n_pds_allocated--;
+ spin_unlock(&dev->n_pds_lock);
+ return 0;
+}