From nobody Tue Feb 10 11:55:27 2026 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 60F84285061; Sat, 20 Dec 2025 04:16:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.51 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766204177; cv=none; b=XAFSYMr0Zld+ULGIx8SNWro6yiildavPg/gimZaK8Q27X0puG7sOj1Zb3ZbEPP9cjs5Ie/STn/71VEP8oJeBb6H+mysVKu35JjZNGdOuhXVBITpHB03YhgfXGy2hZTGA7/IsOUjo1cZqlBOOHMqBfIv0H1Bnj0Av3N8LwqrfeDs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766204177; c=relaxed/simple; bh=QIqtJpxwLDrBV6EfDAgNIV07fN0e+g4BqWV78NQ76EI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=cXBk3rjkqNAKAVW+uRC6PO+pWNwRMaoewk6+QUyQ7RZsWEu7RS6DvlLv0YCS8a5sKMTk+IMmCht3WJkNTv+ivuX3G8KDP4NYC04UH8o0Wv1Qk4+hBayQ5TiEkL5VD+KdNgVZdPBZo2Ppauye7iPcQIQiTJ9X2Lj/vkOBNIAKNm4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.177]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTPS id 4dYB080G58zYQthH; Sat, 20 Dec 2025 12:15:36 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.128]) by mail.maildlp.com (Postfix) with ESMTP id 5F3F84058A; Sat, 20 Dec 2025 12:16:07 +0800 (CST) Received: from huaweicloud.com (unknown [10.50.87.129]) by APP4 (Coremail) with SMTP id gCh0CgD3WPn5IkZpFwpFAw--.56015S11; Sat, 20 Dec 2025 12:16:07 +0800 (CST) From: Hou Tao To: linux-kernel@vger.kernel.org Cc: linux-pci@vger.kernel.org, linux-mm@kvack.org, linux-nvme@lists.infradead.org, Bjorn Helgaas , Logan Gunthorpe , Alistair Popple , Leon Romanovsky , Greg Kroah-Hartman , Tejun Heo , "Rafael J . Wysocki" , Danilo Krummrich , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , Keith Busch , Jens Axboe , Christoph Hellwig , Sagi Grimberg , houtao1@huawei.com Subject: [PATCH 07/13] PCI/P2PDMA: create compound page for aligned p2pdma memory Date: Sat, 20 Dec 2025 12:04:40 +0800 Message-Id: <20251220040446.274991-8-houtao@huaweicloud.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20251220040446.274991-1-houtao@huaweicloud.com> References: <20251220040446.274991-1-houtao@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: gCh0CgD3WPn5IkZpFwpFAw--.56015S11 X-Coremail-Antispam: 1UD129KBjvdXoWrZF1fGF1xWrW3tryUtryrJFb_yoWkZFg_ur WxAwn7XF4kX3Zxtrn0kw1fZryjya97ur1kurs2qa4vyF18uan2vF9rAry5Xw18Ga1IqryD Cr47XF1I9r45KjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbgAYFVCjjxCrM7AC8VAFwI0_Wr0E3s1l1xkIjI8I6I8E6xAIw20E Y4v20xvaj40_Wr0E3s1l1IIY67AEw4v_Jr0_Jr4l82xGYIkIc2x26280x7IE14v26r126s 0DM28IrcIa0xkI8VCY1x0267AKxVW5JVCq3wA2ocxC64kIII0Yj41l84x0c7CEw4AK67xG Y2AK021l84ACjcxK6xIIjxv20xvE14v26F1j6w1UM28EF7xvwVC0I7IYx2IY6xkF7I0E14 v26r4UJVWxJr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAF wI0_GcCE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2 WlYx0E2Ix0cI8IcVAFwI0_JF0_Jw1lYx0Ex4A2jsIE14v26r4UJVWxJr1lOx8S6xCaFVCj c4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JM4IIrI8v6xkF7I0E8cxan2IY04v7MxkF7I0En4 kS14v26r4a6rW5MxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E 5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVW8ZV WrXwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1I6r4UMIIF0xvE2Ix0cI8IcVCY 1x0267AKxVW8Jr0_Cr1UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67 AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4UJVWxJrUvcSsGvfC2KfnxnUUI43ZE Xa7IU0FJmUUUUUU== X-CM-SenderInfo: xkrx3t3r6k3tpzhluzxrxghudrp/ Content-Type: text/plain; charset="utf-8" From: Hou Tao Commit c4386bd8ee3a ("mm/memremap: add ZONE_DEVICE support for compound pages") has already supported compound page for ZONE_DEVICE memory. It not only decreases the memory overhead of ZONE_DEVICE memory through the deduplication of vmemmap pages, it also optimize the performance of get_user_pages when the memory is used for IO. As for now, the alignment of p2p dma memory is already known, setting vmemmap_shift accordingly to create compound page for p2pdma memory. Signed-off-by: Hou Tao --- drivers/pci/p2pdma.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 70482e240304..7180dea4855c 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -447,6 +447,8 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int b= ar, size_t size, pgmap->nr_range =3D 1; pgmap->type =3D MEMORY_DEVICE_PCI_P2PDMA; pgmap->ops =3D &p2pdma_pgmap_ops; + if (align > PAGE_SIZE) + pgmap->vmemmap_shift =3D ilog2(align) - PAGE_SHIFT; p2p_pgmap->mem =3D mem; =20 addr =3D devm_memremap_pages(&pdev->dev, pgmap); --=20 2.29.2