Alistair Popple 28a5933e8d powerpc/powernv/npu: Add lock to prevent race in concurrent context init/destroy ... The pnv_npu2_init_context() and pnv_npu2_destroy_context() functions are used to allocate/free contexts to allow address translation and shootdown by the NPU on a particular GPU. Context initialisation is implicitly safe as it is protected by the requirement mmap_sem be held in write mode, however pnv_npu2_destroy_context() does not require mmap_sem to be held and it is not safe to call with a concurrent initialisation for a different GPU. It was assumed the driver would ensure destruction was not called concurrently with initialisation. However the driver may be simplified by allowing concurrent initialisation and destruction for different GPUs. As npu context creation/destruction is not a performance critical path and the critical section is not large a single spinlock is used for simplicity. Fixes: 1ab66d1fba ("powerpc/powernv: Introduce address translation services for Nvlink2") Cc: stable@vger.kernel.org # v4.12+ Signed-off-by: Alistair Popple <alistair@popple.id.au> Reviewed-by: Mark Hairgrove <mhairgrove@nvidia.com> Tested-by: Mark Hairgrove <mhairgrove@nvidia.com> Reviewed-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>		2018-04-24 09:46:56 +10:00
..
4xx	powerpc/4xx: Fix error return code in ppc4xx_msi_probe()	2018-03-31 00:10:34 +11:00
8xx	powerpc/8xx: fix cpm_cascade() dual end of interrupt	2018-03-13 15:50:28 +11:00
40x
44x
52xx
82xx
83xx
85xx	powerpc/64: Use array of paca pointers and allocate pacas individually	2018-03-30 23:34:23 +11:00
86xx
512x
amigaone
cell	proc: fix /proc/loadavg regression	2018-04-20 17:18:36 -07:00
chrp
embedded6xx	powerpc/wii: Don't rely on the reserved memory hack	2018-04-01 00:47:43 +11:00
maple
pasemi
powermac	powerpc: Use sizeof(*foo) rather than sizeof(struct foo)	2018-03-20 16:47:53 +11:00
powernv	powerpc/powernv/npu: Add lock to prevent race in concurrent context init/destroy	2018-04-24 09:46:56 +10:00
ps3	powerpc: Use sizeof(*foo) rather than sizeof(struct foo)	2018-03-20 16:47:53 +11:00
pseries	powerpc/pseries: Restore default security feature flags on setup	2018-04-03 21:50:09 +10:00
fsl_uli1575.c
Kconfig
Kconfig.cputype	powerpc/64s: Add POWER9 CPU type selection	2018-04-01 22:15:32 +10:00
Makefile