From c7d8b7824ff9de866a356e1892dbe9f191aa5d06 Mon Sep 17 00:00:00 2001 From: Jason Gunthorpe Date: Tue, 6 Aug 2019 20:15:42 -0300 Subject: hmm: use mmu_notifier_get/put for 'struct hmm' This is a significant simplification, it eliminates all the remaining 'hmm' stuff in mm_struct, eliminates krefing along the critical notifier paths, and takes away all the ugly locking and abuse of page_table_lock. mmu_notifier_get() provides the single struct hmm per struct mm which eliminates mm->hmm. It also directly guarantees that no mmu_notifier op callback is callable while concurrent free is possible, this eliminates all the krefs inside the mmu_notifier callbacks. The remaining krefs in the range code were overly cautious, drivers are already not permitted to free the mirror while a range exists. Link: https://lore.kernel.org/r/20190806231548.25242-6-jgg@ziepe.ca Reviewed-by: Christoph Hellwig Reviewed-by: Ralph Campbell Tested-by: Ralph Campbell Signed-off-by: Jason Gunthorpe --- drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c') diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c index f2e8b4238efd..abc233088201 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c @@ -35,6 +35,7 @@ #include #include #include +#include #include "amdgpu.h" #include "amdgpu_irq.h" @@ -1464,6 +1465,7 @@ static void __exit amdgpu_exit(void) amdgpu_unregister_atpx_handler(); amdgpu_sync_fini(); amdgpu_fence_slab_fini(); + mmu_notifier_synchronize(); } module_init(amdgpu_init); -- cgit v1.2.3