linux-kernel - [PATCH 01/83] mm: Add kfd_process pointer to mm

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Date:	Fri, 11 Jul 2014 00:47:26 +0300
From:	Oded Gabbay <oded.gabbay@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	David Airlie <airlied@...ux.ie>,
	Alex Deucher <alexander.deucher@....com>,
	Jerome Glisse <j.glisse@...il.com>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	John Bridgman <John.Bridgman@....com>,
	Andrew Lewycky <Andrew.Lewycky@....com>,
	Joerg Roedel <joro@...tes.org>, linux-mm <linux-mm@...ck.org>,
	Oded Gabbay <oded.gabbay@....com>,
	Rik van Riel <riel@...hat.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Jérôme Glisse <jglisse@...hat.com>,
	Michel Lespinasse <walken@...gle.com>
Subject: [PATCH 01/83] mm: Add kfd_process pointer to mm_struct

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@....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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