Ian Munsie 0712dc7e73 cxl: Fix issues when unmapping contexts ... An issue was introduced with "cxl: Unmap MMIO regions when detaching a context" (b123429e6a) where closing a context normally could also unmap the problem state area of other contexts currently using the AFU. It was also discovered that after a context's MMIO space had been unmapped it would read 0s when accessing it, whereas the expected behaviour was for the access to fail altogether. In order to address these issues, this patch does two things: - Forced mmap unmapping is only done when we are forcefully detaching all contexts, and not in the normal detach path. Since the normal context close path is tied to the file release any mmaps must have already been released so we don't need to worry in that case. - The mmap path now uses a vm_operations_struct with a fault handler. The fault handler ensures that the context is in started state, otherwise it fails the access attempt with a SIGBUS. Fixes: b123429e6a ("cxl: Unmap MMIO regions when detaching a context") Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>		2015-01-12 16:40:02 +11:00
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base.c
context.c	cxl: Fix issues when unmapping contexts	2015-01-12 16:40:02 +11:00
cxl.h	cxl: Unmap MMIO regions when detaching a context	2014-12-12 13:06:48 +11:00
debugfs.c	cxl: Driver code for powernv PCIe based cards for userspace access	2014-10-08 20:15:57 +11:00
fault.c	powerpc/mm: don't do tlbie for updatepp request with NO HPTE fault	2014-12-05 16:26:15 +11:00
file.c	cxl: Fix issues when unmapping contexts	2015-01-12 16:40:02 +11:00
irq.c	cxl: Name interrupts in /proc/interrupt	2014-11-18 13:01:39 +11:00
Kconfig	cxl: Add driver to Kbuild and Makefiles	2014-10-08 20:15:58 +11:00
main.c	cxl: Driver code for powernv PCIe based cards for userspace access	2014-10-08 20:15:57 +11:00
Makefile	cxl: Add driver to Kbuild and Makefiles	2014-10-08 20:15:58 +11:00
native.c	cxl: Add timeout to process element commands	2014-12-12 13:06:47 +11:00
pci.c	cxl: Change contexts_lock to a mutex to fix sleep while atomic bug	2014-12-12 13:06:47 +11:00
sysfs.c	cxl: Change contexts_lock to a mutex to fix sleep while atomic bug	2014-12-12 13:06:47 +11:00