From nobody Tue Feb 10 14:33:25 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 AD6AD2F6193; Sat, 20 Dec 2025 04:16:19 +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=1766204182; cv=none; b=WXJSNcN+AVyaUzx7HqMXB+9MryqmmQLPtMa9SBZCl7tlka3aPccySaY9wpwEh0mWjR8nxB7wTTKjbcUFsCv7dHzyznioURxTIbe3VCxqbZ0r+E4JbCRCNd7T9jRDVkiq3katQpotgVX/97Zel7bOUCq3Vs7td1ecFmuzxqPoN7c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766204182; c=relaxed/simple; bh=xaD8kc2vinKmfPymOQ5h40gVLBPgeL9kEYg6duS4mBM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=W/I953QYYT2IE48mmGjBA/WTEgCdaGT3qDR6eMdVkq8WDRHDXmsT8h/1lyvGDuNP+M+VNJIGL0WM1wjZkgWQZace9ay+0FPu0xlcH7ub8XQ17G8HR9ZeBbb0dLB76Bh2RlZxAvws7pjbDd0NPnj64RwAWSM2cfH5PEs0zuVLql8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=none 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=none smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.177]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTPS id 4dYB0845P2zYQtgg; 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 E15964057D; 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--.56015S17; 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 13/13] PCI/P2PDMA: enable compound page support for p2pdma memory Date: Sat, 20 Dec 2025 12:04:46 +0800 Message-Id: <20251220040446.274991-14-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--.56015S17 X-Coremail-Antispam: 1UD129KBjvdXoWruF13Jw1xKFWxGw48Zw4fKrg_yoWDWwbEvF 4UZ34rXr4kGa42gFyqy34xZrW5tay8Wr1kWF4vya45ZFy09a1vvr1qvry5Xry8Wr97WF98 CasrCF1I9ryjkjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbgAYFVCjjxCrM7AC8VAFwI0_Wr0E3s1l1xkIjI8I6I8E6xAIw20E Y4v20xvaj40_Wr0E3s1l1IIY67AEw4v_Jr0_Jr4l82xGYIkIc2x26280x7IE14v26r126s 0DM28IrcIa0xkI8VCY1x0267AKxVW5JVCq3wA2ocxC64kIII0Yj41l84x0c7CEw4AK67xG Y2AK021l84ACjcxK6xIIjxv20xvE14v26F1j6w1UM28EF7xvwVC0I7IYx2IY6xkF7I0E14 v26r4UJVWxJr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAF wI0_GcCE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2 WlYx0E2Ix0cI8IcVAFwI0_JF0_Jw1lYx0Ex4A2jsIE14v26r4UJVWxJr1lOx8S6xCaFVCj c4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JM4IIrI8v6xkF7I0E8cxan2IY04v7MxkF7I0En4 kS14v26r4a6rW5MxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E 5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVW8ZV WrXwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r4j6ryUMIIF0xvE2Ix0cI8IcVCY 1x0267AKxVW8Jr0_Cr1UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67 AKxVW8JVWxJwCI42IY6I8E87Iv6xkF7I0E14v26r4UJVWxJrUvcSsGvfC2KfnxnUUI43ZE Xa7IU0FJmUUUUUU== X-CM-SenderInfo: xkrx3t3r6k3tpzhluzxrxghudrp/ Content-Type: text/plain; charset="utf-8" From: Hou Tao Compound page support for P2PDMA memory in both kernel and user space is now in place. Enable it by allowing PUD_SIZE and PMD_SIZE alignment. Signed-off-by: Hou Tao --- drivers/pci/p2pdma.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 4a133219ac43..969bdacdcf8b 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -452,9 +452,19 @@ static inline int pci_p2pdma_check_pagemap_align(struc= t pci_dev *pdev, int bar, u64 size, size_t align, u64 offset) { + if (has_transparent_pud_hugepage() && align =3D=3D PUD_SIZE) + goto more_check; + if (has_transparent_hugepage() && align =3D=3D PMD_SIZE) + goto more_check; if (align =3D=3D PAGE_SIZE) return 0; return -EINVAL; + +more_check: + if (IS_ALIGNED(pci_resource_start(pdev, bar), align) && + IS_ALIGNED(size, align) && IS_ALIGNED(offset, align)) + return 0; + return -EINVAL; } =20 /** --=20 2.29.2