kernel/linux.git/drivers/misc/ocxl/context.c, branch v6.6.134

mm: replace vma->vm_flags direct modifications with modifier calls

2023-02-10T00:51:39+00:00

Replace direct modifications to vma->vm_flags with calls to modifier functions to be able to track flag changes and to keep vma locking correctness. [akpm@linux-foundation.org: fix drivers/misc/open-dice.c, per Hyeonggon Yoo] Link: https://lkml.kernel.org/r/20230126193752.297968-5-surenb@google.com Signed-off-by: Suren Baghdasaryan Acked-by: Michal Hocko Acked-by: Mel Gorman Acked-by: Mike Rapoport (IBM) Acked-by: Sebastian Reichel Reviewed-by: Liam R. Howlett Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: Andy Lutomirski Cc: Arjun Roy Cc: Axel Rasmussen Cc: David Hildenbrand Cc: David Howells Cc: Davidlohr Bueso Cc: David Rientjes Cc: Eric Dumazet Cc: Greg Thelen Cc: Hugh Dickins Cc: Ingo Molnar Cc: Jann Horn Cc: Joel Fernandes Cc: Johannes Weiner Cc: Kent Overstreet Cc: Laurent Dufour Cc: Lorenzo Stoakes Cc: Matthew Wilcox Cc: Minchan Kim Cc: Paul E. McKenney Cc: Peter Oskolkov Cc: Peter Xu Cc: Peter Zijlstra Cc: Punit Agrawal Cc: Sebastian Andrzej Siewior Cc: Shakeel Butt Cc: Soheil Hassas Yeganeh Cc: Song Liu Cc: Vlastimil Babka Cc: Will Deacon Signed-off-by: Andrew Morton

ocxl: Update the Process Element Entry

2020-12-03T14:01:30+00:00

To complete the MMIO based mechanism, the fields: PASID, bus, device and function of the Process Element Entry have to be filled. (See OpenCAPI Power Platform Architecture document) Hypervisor Process Element Entry Word 0 1 .... 7 8 ...... 12 13 ..15 16.... 19 20 ........... 31 0 OSL Configuration State (0:31) 1 OSL Configuration State (32:63) 2 PASID | Reserved 3 Bus | Device |Function | Reserved 4 Reserved 5 Reserved 6 .... Signed-off-by: Christophe Lombard Acked-by: Frederic Barrat Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20201125155013.39955-4-clombard@linux.vnet.ibm.com

ocxl: Fix misleading comment

2020-05-20T13:39:57+00:00

In ocxl_context_free() we note that the AFU reference we're releasing was taken in "ocxl_context_init", a function that no longer exists. Fix it to say ocxl_context_alloc() instead, which is the new name for ocxl_context_init(), since it was renamed. Fixes: b9721d275cc2 ("ocxl: Allow external drivers to use OpenCAPI contexts") Signed-off-by: Andrew Donnellan Acked-by: Frederic Barrat Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200226043923.5481-1-ajd@linux.ibm.com

ocxl: Fix potential memory leak on context creation

2019-12-13T20:59:39+00:00

If we couldn't fully init a context, we were leaking memory. Fixes: b9721d275cc2 ("ocxl: Allow external drivers to use OpenCAPI contexts") Signed-off-by: Frederic Barrat Acked-by: Andrew Donnellan Reviewed-by: Greg Kurz Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20191209105513.8566-1-fbarrat@linux.ibm.com

ocxl: Allow contexts to be attached with a NULL mm

2019-07-03T19:29:47+00:00

If an OpenCAPI context is to be used directly by a kernel driver, there may not be a suitable mm to use. The patch makes the mm parameter to ocxl_context_attach optional. Signed-off-by: Alastair D'Silva Acked-by: Andrew Donnellan Acked-by: Frederic Barrat Acked-by: Nicholas Piggin Link: https://lore.kernel.org/r/20190620041203.12274-1-alastair@au1.ibm.com Signed-off-by: Greg Kroah-Hartman

ocxl: afu_irq only deals with IRQ IDs, not offsets

2019-05-02T16:55:02+00:00

The use of offsets is required only in the frontend, so alter the IRQ API to only work with IRQ IDs in the backend. Signed-off-by: Alastair D'Silva Acked-by: Frederic Barrat Signed-off-by: Michael Ellerman

ocxl: Allow external drivers to use OpenCAPI contexts

2019-05-02T16:55:02+00:00

Most OpenCAPI operations require a valid context, so exposing these functions to external drivers is necessary. Signed-off-by: Alastair D'Silva Reviewed-by: Greg Kurz Acked-by: Frederic Barrat Signed-off-by: Michael Ellerman

ocxl: Create a clear delineation between ocxl backend & frontend

2019-05-02T16:55:01+00:00

The OCXL driver contains both frontend code for interacting with userspace, as well as backend code for interacting with the hardware. This patch separates the backend code from the frontend so that it can be used by other device drivers that communicate via OpenCAPI. Relocate dev, cdev & sysfs files to the frontend code to allow external drivers to maintain their own devices. Reference counting on the device in the backend is replaced with kref counting. Move file & sysfs layer initialisation from core.c (backend) to pci.c (frontend). Create an ocxl_function oriented interface for initing devices & enumerating AFUs. Signed-off-by: Alastair D'Silva Acked-by: Frederic Barrat Signed-off-by: Michael Ellerman

ocxl: Change return type for fault handler

2018-07-02T13:54:26+00:00

Use new return type vm_fault_t for fault handler. For now, this is just documenting that the function returns a VM_FAULT value rather than an errno. Once all instances are converted, vm_fault_t will become a distinct type. Ref-> commit 1c8f422059ae ("mm: change return type to vm_fault_t") There is an existing bug when vm_insert_pfn() can return ENOMEM which was ignored and VM_FAULT_NOPAGE returned as default. The new inline vmf_insert_pfn() has removed this inefficiency by returning correct vm_fault_ type. Signed-off-by: Souptick Joarder Acked-by: Andrew Donnellan Acked-by: Frederic Barrat Signed-off-by: Michael Ellerman

ocxl: Expose the thread_id needed for wait on POWER9

2018-06-03T10:40:32+00:00

In order to successfully issue as_notify, an AFU needs to know the TID to notify, which in turn means that this information should be available in userspace so it can be communicated to the AFU. Signed-off-by: Alastair D'Silva Acked-by: Andrew Donnellan Signed-off-by: Michael Ellerman