From nobody Tue Feb 10 15:29:07 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 60DF9275AEB; 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=ARJuuwLgvwvodhV/VyuSypCuAvxJKK90knO7S50hepXq/IjZc28tbr75A8CqDf/bvXnTOFf15L9qXF+IEKWTp4KVhepDpLxjc46uz5JEyfZcja9Rh8b6L29Gh0EIfrgrfPgoUM2jy0xDns9qi4d3OjDmlm6JlUrh/KBIyyEr/1U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766204177; c=relaxed/simple; bh=9vCTTJw9IQZQdFTnf+iBa15xvCU0d4qAo3nVeWr1T/M=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=fGFJ+GO5Gk/mie+zheRHSl2HyBqNXa9h0iv7IK8JvH9ozGkRnvNsEc5wmPyOuNethYV+NH0674P3fuQi8jw/gzaxDQ0KybGPJd2+O8UeUZMsd1AoCj7Ky6ZcuvHCf/0fiOUAV261keRoRDWQFUbsZJb7ebfvpU4eS+orkBpSZD4= 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 [172.19.163.198]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTPS id 4dYB076fLpzYQtgv; Sat, 20 Dec 2025 12:15:35 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.128]) by mail.maildlp.com (Postfix) with ESMTP id 424F240575; 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--.56015S9; Sat, 20 Dec 2025 12:16:06 +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 05/13] sysfs: support get_unmapped_area callback for binary file Date: Sat, 20 Dec 2025 12:04:38 +0800 Message-Id: <20251220040446.274991-6-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--.56015S9 X-Coremail-Antispam: 1UD129KBjvJXoW7uF48Xw1DWw45tr1rXFy8AFb_yoW8uF4rpF sYk343XrZ7G3srKr9xAFW5W343KwnrGr1q9rZ2g343AwnrtF9Ig3yjya15JryrJrW8Cr1x KF429ryYkrW5G37anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPlb4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUAV Cq3wA2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0 rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVW7JVWDJwA2z4x0Y4vE2Ix0cI8IcVCY1x0267 AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E 14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7 xfMcIj6xIIjxv20xvE14v26r126r1DMcIj6I8E87Iv67AKxVW8Jr0_Cr1UMcvjeVCFs4IE 7xkEbVWUJVW8JwACjcxG0xvY0x0EwIxGrwACI402YVCY1x02628vn2kIc2xKxwCY1x0262 kKe7AKxVW8ZVWrXwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s02 6c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_GF v_WrylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUCVW8JwCI42IY6xIIjxv20xvE c7CjxVAFwI0_Gr1j6F4UJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aV AFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVW8Jr0_Cr1UYxBIdaVFxhVjvjDU0xZF pf9x07j4fO7UUUUU= X-CM-SenderInfo: xkrx3t3r6k3tpzhluzxrxghudrp/ Content-Type: text/plain; charset="utf-8" From: Hou Tao Add support for ->get_unmapped_area callback for binary sysfs file. The following patch will use it to support compound page for p2pdma device memory when the device memory is mapped into userspace. Signed-off-by: Hou Tao --- fs/sysfs/file.c | 15 +++++++++++++++ include/linux/sysfs.h | 4 ++++ 2 files changed, 19 insertions(+) diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index 3825e780cc58..e843795ebdc2 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -164,6 +164,20 @@ static ssize_t sysfs_kf_bin_write(struct kernfs_open_f= ile *of, char *buf, return battr->write(of->file, kobj, battr, buf, pos, count); } =20 +static unsigned long sysfs_kf_bin_get_unmapped_area(struct kernfs_open_fil= e *of, + unsigned long uaddr, unsigned long len, + unsigned long pgoff, unsigned long flags) +{ + const struct bin_attribute *battr =3D of->kn->priv; + struct kobject *kobj; + + if (!battr->get_unmapped_area) + return -EOPNOTSUPP; + + kobj =3D sysfs_file_kobj(of->kn); + return battr->get_unmapped_area(of->file, kobj, battr, uaddr, len, pgoff,= flags); +} + static int sysfs_kf_bin_mmap(struct kernfs_open_file *of, struct vm_area_struct *vma) { @@ -268,6 +282,7 @@ static const struct kernfs_ops sysfs_bin_kfops_mmap =3D= { .mmap =3D sysfs_kf_bin_mmap, .open =3D sysfs_kf_bin_open, .llseek =3D sysfs_kf_bin_llseek, + .get_unmapped_area =3D sysfs_kf_bin_get_unmapped_area, }; =20 int sysfs_add_file_mode_ns(struct kernfs_node *parent, diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index c33a96b7391a..f4a50f244f4d 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -321,6 +321,10 @@ struct bin_attribute { loff_t, int); int (*mmap)(struct file *, struct kobject *, const struct bin_attribute *= attr, struct vm_area_struct *vma); + unsigned long (*get_unmapped_area)(struct file *, struct kobject *, + const struct bin_attribute *attr, + unsigned long uaddr, unsigned long len, + unsigned long pgoff, unsigned long flags); }; =20 /** --=20 2.29.2