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Message-ID: <53C7D666.6000405@amd.com>
Date: Thu, 17 Jul 2014 16:57:58 +0300
From: Oded Gabbay <oded.gabbay@....com>
To: David Airlie <airlied@...ux.ie>,
Jerome Glisse <j.glisse@...il.com>,
"Alex Deucher" <alexdeucher@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>
CC: John Bridgman <John.Bridgman@....com>,
Joerg Roedel <joro@...tes.org>,
Andrew Lewycky <Andrew.Lewycky@....com>,
Christian König <deathsimple@...afone.de>,
Michel Dänzer <michel.daenzer@....com>,
Ben Goz <Ben.Goz@....com>,
Alexey Skidanov <Alexey.Skidanov@....com>,
Evgeny Pinchuk <Evgeny.Pinchuk@....com>,
"Oded Gabbay" <oded.gabbay@....com>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Rik van Riel <riel@...hat.com>,
"Peter Zijlstra" <peterz@...radead.org>,
Mel Gorman <mgorman@...e.de>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Jérôme Glisse <jglisse@...hat.com>,
<linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>
Subject: [PATCH v2 01/25] mm: Add kfd_process pointer to mm_struct
Forgot to add mm mailing list. Sorry.
This patch enables the amdkfd driver 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 amdkfd 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.
In v3 of the patchset I will update the binding to match the final discussions
on [PATCH 1/8] mmput: use notifier chain to call subsystem exit handler.
In the meantime, I'm going to try and see if I can drop the kfd_process
in mm_struct and remove the use of the new notification chain in mmput.
Instead, I will try to use the mmu release notifier.
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..ff71496 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -20,6 +20,10 @@
struct hmm;
#endif
+#if defined(CONFIG_HSA_RADEON) || defined(CONFIG_HSA_RADEON_MODULE)
+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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