From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qg0-f44.google.com (mail-qg0-f44.google.com [209.85.192.44]) by kanga.kvack.org (Postfix) with ESMTP id 523096B003B for ; Thu, 17 Jul 2014 09:58:17 -0400 (EDT) Received: by mail-qg0-f44.google.com with SMTP id e89so1978945qgf.17 for ; Thu, 17 Jul 2014 06:58:17 -0700 (PDT) Received: from na01-bn1-obe.outbound.protection.outlook.com (mail-bn1blp0188.outbound.protection.outlook.com. [207.46.163.188]) by mx.google.com with ESMTPS id 109si2542274qgu.105.2014.07.17.06.58.16 for (version=TLSv1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 17 Jul 2014 06:58:16 -0700 (PDT) Message-ID: <53C7D666.6000405@amd.com> Date: Thu, 17 Jul 2014 16:57:58 +0300 From: Oded Gabbay MIME-Version: 1.0 Subject: [PATCH v2 01/25] mm: Add kfd_process pointer to mm_struct References: <1405603773-32688-1-git-send-email-oded.gabbay@amd.com> In-Reply-To: <1405603773-32688-1-git-send-email-oded.gabbay@amd.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: David Airlie , Jerome Glisse , Alex Deucher , Andrew Morton Cc: John Bridgman , Joerg Roedel , Andrew Lewycky , =?UTF-8?B?Q2hyaXN0aWFuIEvDtm5pZw==?= , =?UTF-8?B?TWljaGVsIETDpG56ZXI=?= , Ben Goz , Alexey Skidanov , Evgeny Pinchuk , Oded Gabbay , "Kirill A. Shutemov" , Rik van Riel , Peter Zijlstra , Mel Gorman , Joonsoo Kim , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , linux-kernel@vger.kernel.org, linux-mm 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 --- 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org