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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /include/rdma/ib_umem_odp.h
parentInitial commit. (diff)
downloadlinux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz
linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'include/rdma/ib_umem_odp.h')
-rw-r--r--include/rdma/ib_umem_odp.h115
1 files changed, 115 insertions, 0 deletions
diff --git a/include/rdma/ib_umem_odp.h b/include/rdma/ib_umem_odp.h
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index 000000000..0844c1d05
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+++ b/include/rdma/ib_umem_odp.h
@@ -0,0 +1,115 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/*
+ * Copyright (c) 2014 Mellanox Technologies. All rights reserved.
+ */
+
+#ifndef IB_UMEM_ODP_H
+#define IB_UMEM_ODP_H
+
+#include <rdma/ib_umem.h>
+#include <rdma/ib_verbs.h>
+
+struct ib_umem_odp {
+ struct ib_umem umem;
+ struct mmu_interval_notifier notifier;
+ struct pid *tgid;
+
+ /* An array of the pfns included in the on-demand paging umem. */
+ unsigned long *pfn_list;
+
+ /*
+ * An array with DMA addresses mapped for pfns in pfn_list.
+ * The lower two bits designate access permissions.
+ * See ODP_READ_ALLOWED_BIT and ODP_WRITE_ALLOWED_BIT.
+ */
+ dma_addr_t *dma_list;
+ /*
+ * The umem_mutex protects the page_list and dma_list fields of an ODP
+ * umem, allowing only a single thread to map/unmap pages. The mutex
+ * also protects access to the mmu notifier counters.
+ */
+ struct mutex umem_mutex;
+ void *private; /* for the HW driver to use. */
+
+ int npages;
+
+ /*
+ * An implicit odp umem cannot be DMA mapped, has 0 length, and serves
+ * only as an anchor for the driver to hold onto the per_mm. FIXME:
+ * This should be removed and drivers should work with the per_mm
+ * directly.
+ */
+ bool is_implicit_odp;
+
+ unsigned int page_shift;
+};
+
+static inline struct ib_umem_odp *to_ib_umem_odp(struct ib_umem *umem)
+{
+ return container_of(umem, struct ib_umem_odp, umem);
+}
+
+/* Returns the first page of an ODP umem. */
+static inline unsigned long ib_umem_start(struct ib_umem_odp *umem_odp)
+{
+ return umem_odp->notifier.interval_tree.start;
+}
+
+/* Returns the address of the page after the last one of an ODP umem. */
+static inline unsigned long ib_umem_end(struct ib_umem_odp *umem_odp)
+{
+ return umem_odp->notifier.interval_tree.last + 1;
+}
+
+static inline size_t ib_umem_odp_num_pages(struct ib_umem_odp *umem_odp)
+{
+ return (ib_umem_end(umem_odp) - ib_umem_start(umem_odp)) >>
+ umem_odp->page_shift;
+}
+
+/*
+ * The lower 2 bits of the DMA address signal the R/W permissions for
+ * the entry. To upgrade the permissions, provide the appropriate
+ * bitmask to the map_dma_pages function.
+ *
+ * Be aware that upgrading a mapped address might result in change of
+ * the DMA address for the page.
+ */
+#define ODP_READ_ALLOWED_BIT (1<<0ULL)
+#define ODP_WRITE_ALLOWED_BIT (1<<1ULL)
+
+#define ODP_DMA_ADDR_MASK (~(ODP_READ_ALLOWED_BIT | ODP_WRITE_ALLOWED_BIT))
+
+#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
+
+struct ib_umem_odp *
+ib_umem_odp_get(struct ib_device *device, unsigned long addr, size_t size,
+ int access, const struct mmu_interval_notifier_ops *ops);
+struct ib_umem_odp *ib_umem_odp_alloc_implicit(struct ib_device *device,
+ int access);
+struct ib_umem_odp *
+ib_umem_odp_alloc_child(struct ib_umem_odp *root_umem, unsigned long addr,
+ size_t size,
+ const struct mmu_interval_notifier_ops *ops);
+void ib_umem_odp_release(struct ib_umem_odp *umem_odp);
+
+int ib_umem_odp_map_dma_and_lock(struct ib_umem_odp *umem_odp, u64 start_offset,
+ u64 bcnt, u64 access_mask, bool fault);
+
+void ib_umem_odp_unmap_dma_pages(struct ib_umem_odp *umem_odp, u64 start_offset,
+ u64 bound);
+
+#else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
+
+static inline struct ib_umem_odp *
+ib_umem_odp_get(struct ib_device *device, unsigned long addr, size_t size,
+ int access, const struct mmu_interval_notifier_ops *ops)
+{
+ return ERR_PTR(-EINVAL);
+}
+
+static inline void ib_umem_odp_release(struct ib_umem_odp *umem_odp) {}
+
+#endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
+
+#endif /* IB_UMEM_ODP_H */