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Subject[PATCH 01/83] mm: Add kfd_process pointer to mm_struct
Date
This patch enables the KFD to retrieve the kfd_process
object from the process's mm_struct. This is needed because kfd_process
lifespan is bound to the process's mm_struct lifespan.

When KFD is notified about an mm_struct tear-down, it checks if the
kfd_process pointer is valid. If so, it releases the kfd_process object
and all relevant resources.

Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
---
include/linux/mm_types.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 678097c..6179107 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -20,6 +20,10 @@
struct hmm;
#endif

+#ifdef CONFIG_HSA_RADEON
+struct kfd_process;
+#endif
+
#ifndef AT_VECTOR_SIZE_ARCH
#define AT_VECTOR_SIZE_ARCH 0
#endif
@@ -439,6 +443,16 @@ struct mm_struct {
*/
struct hmm *hmm;
#endif
+#if defined(CONFIG_HSA_RADEON) || defined(CONFIG_HSA_RADEON_MODULE)
+ /*
+ * kfd always register an mmu_notifier we rely on mmu notifier to keep
+ * refcount on mm struct as well as forbiding registering kfd on a
+ * dying mm
+ *
+ * This field is set with mmap_sem old in write mode.
+ */
+ struct kfd_process *kfd_process;
+#endif
#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS
pgtable_t pmd_huge_pte; /* protected by page_table_lock */
#endif
--
1.9.1


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