linux-dev/drivers/infiniband/core/uverbs_mem.c, branch master

IB/uverbs: Export ib_umem_get()/ib_umem_release() to modules

2007-05-09T01:00:37Z

Export ib_umem_get()/ib_umem_release() and put low-level drivers in control of when to call ib_umem_get() to pin and DMA map userspace, rather than always calling it in ib_uverbs_reg_mr() before calling the low-level driver's reg_user_mr method. Also move these functions to be in the ib_core module instead of ib_uverbs, so that driver modules using them do not depend on ib_uverbs. This has a number of advantages: - It is better design from the standpoint of making generic code a library that can be used or overridden by device-specific code as the details of specific devices dictate. - Drivers that do not need to pin userspace memory regions do not need to take the performance hit of calling ib_mem_get(). For example, although I have not tried to implement it in this patch, the ipath driver should be able to avoid pinning memory and just use copy_{to,from}_user() to access userspace memory regions. - Buffers that need special mapping treatment can be identified by the low-level driver. For example, it may be possible to solve some Altix-specific memory ordering issues with mthca CQs in userspace by mapping CQ buffers with extra flags. - Drivers that need to pin and DMA map userspace memory for things other than memory regions can use ib_umem_get() directly, instead of hacks using extra parameters to their reg_phys_mr method. For example, the mlx4 driver that is pending being merged needs to pin and DMA map QP and CQ buffers, but it does not need to create a memory key for these buffers. So the cleanest solution is for mlx4 to call ib_umem_get() in the create_qp and create_cq methods. Signed-off-by: Roland Dreier

IB/core: Use the new verbs DMA mapping functions

2006-12-12T22:28:30Z

Convert code in core/ to use the new DMA mapping functions for kernel verbs consumers. Signed-off-by: Ralph Campbell Signed-off-by: Roland Dreier

WorkStruct: make allyesconfig

2006-11-22T14:57:56Z

Fix up for make allyesconfig. Signed-Off-By: David Howells

IB/uverbs: Don't leak ref to mm on error path

2006-05-18T05:20:50Z

In ib_umem_release_on_close(), if the kmalloc() fails, then a reference to current->mm will be leaked. Fix this by adding a mmput() instead of just returning on kmalloc() failure. Signed-off-by: Roland Dreier

[PATCH] IB: Add copyright notices

2005-08-27T03:37:35Z

Make some lawyers happy and add copyright notices for people who forgot to include them when they actually touched the code. Signed-off-by: Roland Dreier

[PATCH] IB uverbs: memory pinning implementation

2005-07-08T01:23:48Z

Add support for pinning userspace memory regions and returning a list of pages in the region. This includes tracking pinned memory against vm_locked and preventing unprivileged users from exceeding RLIMIT_MEMLOCK. Signed-off-by: Roland Dreier Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds