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authorMichal Kalderon <michal.kalderon@marvell.com>2019-10-30 11:44:12 +0200
committerJason Gunthorpe <jgg@mellanox.com>2019-11-06 13:08:01 -0400
commitc043ff2cfb7f6fdd9a1cb1a7ba3800f19b70bf65 (patch)
tree3ef328e73030f88b318ea9bcdc6497fdd3dbf4d2 /include
parentRDMA/core: Create mmap database and cookie helper functions (diff)
downloadlinux-dev-c043ff2cfb7f6fdd9a1cb1a7ba3800f19b70bf65.tar.xz
linux-dev-c043ff2cfb7f6fdd9a1cb1a7ba3800f19b70bf65.zip
RDMA: Connect between the mmap entry and the umap_priv structure
The rdma_user_mmap_io interface created a common interface for drivers to correctly map hw resources and zap them once the ucontext is destroyed enabling the drivers to safely free the hw resources. However, this meant the drivers need to delay freeing the resource to the ucontext destroy phase to ensure they were no longer mapped. The new mechanism for a common way of handling user/driver address mapping enabled notifying the driver if all umap_priv mappings were removed, and enabled freeing the hw resources when they are done with and not delay it until ucontext destroy. Since not all drivers use the mechanism, NULL can be sent to the rdma_user_mmap_io interface to continue working as before. Drivers that use the mmap_xa interface can pass the entry being mapped to the rdma_user_mmap_io function to be linked together. Link: https://lore.kernel.org/r/20191030094417.16866-4-michal.kalderon@marvell.com Signed-off-by: Ariel Elior <ariel.elior@marvell.com> Signed-off-by: Michal Kalderon <michal.kalderon@marvell.com> Reviewed-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to '')
-rw-r--r--include/rdma/ib_verbs.h13
1 files changed, 2 insertions, 11 deletions
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 8865ec28180a..416e72ea80d9 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -2826,18 +2826,9 @@ void ib_set_client_data(struct ib_device *device, struct ib_client *client,
void ib_set_device_ops(struct ib_device *device,
const struct ib_device_ops *ops);
-#if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS)
int rdma_user_mmap_io(struct ib_ucontext *ucontext, struct vm_area_struct *vma,
- unsigned long pfn, unsigned long size, pgprot_t prot);
-#else
-static inline int rdma_user_mmap_io(struct ib_ucontext *ucontext,
- struct vm_area_struct *vma,
- unsigned long pfn, unsigned long size,
- pgprot_t prot)
-{
- return -EINVAL;
-}
-#endif
+ unsigned long pfn, unsigned long size, pgprot_t prot,
+ struct rdma_user_mmap_entry *entry);
int rdma_user_mmap_entry_insert(struct ib_ucontext *ucontext,
struct rdma_user_mmap_entry *entry,
size_t length);