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b=U75vI9f0+FXUyrPpqdGiEWApL2ueRGSa4qzaRSReD8u9ZV+b4rkruuYKQs19udEtYnl22dOYhHuUwCjtFdV+wHxM6w8bcT6crf9Ya6GT4Hy/c0Ko9d2NQjzbj7GIqebvGADL62E/3Qd2oYbt/iUQ9Swsst6pOSvajPLogwDBTPlV2E9SvIUTN5E8aX/4toConYrbJS7y7BizsTexQfx7mA+RAEJXUqkiYnPiYLPIB8n8ibHp4asTbXQCsvrUUy4AkBK83soUDxrJ54Wx+FFO7FsDp54YITrQ4vtsjKX2pK7khzmiyEqag3fk1nvDcqZwaAOaO2rdYMCvm+KZolHIng== Received: from DS0PR12MB7726.namprd12.prod.outlook.com (2603:10b6:8:130::6) by SN7PR12MB7854.namprd12.prod.outlook.com (2603:10b6:806:32b::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7409.46; Thu, 11 Apr 2024 00:57:55 +0000 Received: from DS0PR12MB7726.namprd12.prod.outlook.com ([fe80::c5de:1187:4532:de80]) by DS0PR12MB7726.namprd12.prod.outlook.com ([fe80::c5de:1187:4532:de80%7]) with mapi id 15.20.7409.042; Thu, 11 Apr 2024 00:57:55 +0000 From: Alistair Popple To: linux-mm@kvack.org Cc: david@fromorbit.com, dan.j.williams@intel.com, jhubbard@nvidia.com, rcampbell@nvidia.com, willy@infradead.org, jgg@nvidia.com, linux-fsdevel@vger.kernel.org, jack@suse.cz, djwong@kernel.org, hch@lst.de, david@redhat.com, ruansy.fnst@fujitsu.com, nvdimm@lists.linux.dev, linux-xfs@vger.kernel.org, linux-ext4@vger.kernel.org, jglisse@redhat.com, Alistair Popple Subject: [RFC 03/10] pci/p2pdma: Don't initialise page refcount to one Date: Thu, 11 Apr 2024 10:57:24 +1000 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: X-ClientProxiedBy: SY2PR01CA0004.ausprd01.prod.outlook.com (2603:10c6:1:14::16) To DS0PR12MB7726.namprd12.prod.outlook.com (2603:10b6:8:130::6) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR12MB7726:EE_|SN7PR12MB7854:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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This is currently the case for MEMORY_DEVICE_PRIVATE and MEMORY_DEVICE_COHERENT pages but not MEMORY_DEVICE_PCI_P2PDMA pages so fix that up. Signed-off-by: Alistair Popple --- drivers/pci/p2pdma.c | 2 ++ mm/memremap.c | 8 ++++---- mm/mm_init.c | 4 +++- 3 files changed, 9 insertions(+), 5 deletions(-) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index fa7370f..ab7ef18 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -128,6 +128,8 @@ static int p2pmem_alloc_mmap(struct file *filp, struct kobject *kobj, goto out; } + get_page(virt_to_page(kaddr)); + /* * vm_insert_page() can sleep, so a reference is taken to mapping * such that rcu_read_unlock() can be done before inserting the diff --git a/mm/memremap.c b/mm/memremap.c index bee8556..99d26ff 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -508,15 +508,15 @@ void free_zone_device_page(struct page *page) page->mapping = NULL; page->pgmap->ops->page_free(page); - if (page->pgmap->type != MEMORY_DEVICE_PRIVATE && - page->pgmap->type != MEMORY_DEVICE_COHERENT) + if (page->pgmap->type == MEMORY_DEVICE_PRIVATE || + page->pgmap->type == MEMORY_DEVICE_COHERENT) + put_dev_pagemap(page->pgmap); + else if (page->pgmap->type != MEMORY_DEVICE_PCI_P2PDMA) /* * Reset the page count to 1 to prepare for handing out the page * again. */ set_page_count(page, 1); - else - put_dev_pagemap(page->pgmap); } void zone_device_page_init(struct page *page) diff --git a/mm/mm_init.c b/mm/mm_init.c index 50f2f34..da45abd 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -6,6 +6,7 @@ * Author Mel Gorman * */ +#include "linux/memremap.h" #include #include #include @@ -1006,7 +1007,8 @@ static void __ref __init_zone_device_page(struct page *page, unsigned long pfn, * which will set the page count to 1 when allocating the page. */ if (pgmap->type == MEMORY_DEVICE_PRIVATE || - pgmap->type == MEMORY_DEVICE_COHERENT) + pgmap->type == MEMORY_DEVICE_COHERENT || + pgmap->type == MEMORY_DEVICE_PCI_P2PDMA) set_page_count(page, 0); }