Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751513AbdISK0I (ORCPT ); Tue, 19 Sep 2017 06:26:08 -0400 Received: from mail-wr0-f181.google.com ([209.85.128.181]:51659 "EHLO mail-wr0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751445AbdISK0G (ORCPT ); Tue, 19 Sep 2017 06:26:06 -0400 X-Google-Smtp-Source: AOwi7QDZuNfiZJHBcpXaBQotKyyjebokD8x9zVUACXyuyuuNAXkFU0qiHlNFGoHxYm9BqhrjrKrpbw== From: Benjamin Gaignard To: labbott@redhat.com, sumit.semwal@linaro.org, gregkh@linuxfoundation.org, arve@android.com, riandrews@android.com, broonie@kernel.org, dan.carpenter@oracle.com Cc: devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, Benjamin Gaignard Subject: [PATCH v2 2/2] staging: ion: create one device entry per heap Date: Tue, 19 Sep 2017 12:25:38 +0200 Message-Id: <1505816738-30017-3-git-send-email-benjamin.gaignard@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1505816738-30017-1-git-send-email-benjamin.gaignard@linaro.org> References: <1505816738-30017-1-git-send-email-benjamin.gaignard@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4953 Lines: 164 Instead a getting one common device "/dev/ion" for all the heaps this patch allow to create one device entry ("/dev/ionX") per heap. Getting an entry per heap could allow to set security rules per heap and global ones for all heaps. Allocation requests will be only allowed if the mask_id match with device minor. Query request could be done on any of the devices. Signed-off-by: Benjamin Gaignard --- drivers/staging/android/ion/ion-ioctl.c | 11 +++++++++-- drivers/staging/android/ion/ion.c | 23 +++++++++++++++++------ drivers/staging/android/ion/ion.h | 10 +++++++--- 3 files changed, 33 insertions(+), 11 deletions(-) diff --git a/drivers/staging/android/ion/ion-ioctl.c b/drivers/staging/android/ion/ion-ioctl.c index e26b786..c8c906c 100644 --- a/drivers/staging/android/ion/ion-ioctl.c +++ b/drivers/staging/android/ion/ion-ioctl.c @@ -25,8 +25,11 @@ union ion_ioctl_arg { struct ion_heap_query query; }; -static int validate_ioctl_arg(unsigned int cmd, union ion_ioctl_arg *arg) +static int validate_ioctl_arg(struct file *filp, + unsigned int cmd, union ion_ioctl_arg *arg) { + int mask = 1 << iminor(filp->f_inode); + switch (cmd) { case ION_IOC_HEAP_QUERY: if (arg->query.reserved0 || @@ -34,6 +37,10 @@ static int validate_ioctl_arg(unsigned int cmd, union ion_ioctl_arg *arg) arg->query.reserved2 ) return -EINVAL; break; + case ION_IOC_ALLOC: + if (!(arg->allocation.heap_id_mask & mask)) + return -EINVAL; + break; default: break; } @@ -69,7 +76,7 @@ long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) if (copy_from_user(&data, (void __user *)arg, _IOC_SIZE(cmd))) return -EFAULT; - ret = validate_ioctl_arg(cmd, &data); + ret = validate_ioctl_arg(filp, cmd, &data); if (WARN_ON_ONCE(ret)) return ret; diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c index 93e2c90..3f8b595 100644 --- a/drivers/staging/android/ion/ion.c +++ b/drivers/staging/android/ion/ion.c @@ -40,6 +40,8 @@ #include "ion.h" +#define ION_DEV_MAX 32 + static struct ion_device *internal_dev; static int heap_id; @@ -541,11 +543,24 @@ void ion_device_add_heap(struct ion_heap *heap) { struct dentry *debug_file; struct ion_device *dev = internal_dev; + int ret; if (!heap->ops->allocate || !heap->ops->free) pr_err("%s: can not add heap with invalid ops struct.\n", __func__); + if (heap_id >= ION_DEV_MAX) + return -EBUSY; + + heap->ddev.devt = MKDEV(MAJOR(dev->devt), heap_id); + dev_set_name(&heap->ddev, "ion%d", heap_id); + device_initialize(&heap->ddev); + cdev_init(&heap->chrdev, &ion_fops); + heap->chrdev.owner = THIS_MODULE; + ret = cdev_device_add(&heap->chrdev, &heap->ddev); + if (ret < 0) + return; + spin_lock_init(&heap->free_lock); heap->free_list_size = 0; @@ -595,13 +610,9 @@ static int ion_device_create(void) if (!idev) return -ENOMEM; - idev->dev.minor = MISC_DYNAMIC_MINOR; - idev->dev.name = "ion"; - idev->dev.fops = &ion_fops; - idev->dev.parent = NULL; - ret = misc_register(&idev->dev); + ret = alloc_chrdev_region(&idev->devt, 0, ION_DEV_MAX, "ion"); if (ret) { - pr_err("ion: failed to register misc device.\n"); + pr_err("ion: unable to allocate major\n"); kfree(idev); return ret; } diff --git a/drivers/staging/android/ion/ion.h b/drivers/staging/android/ion/ion.h index 621e5f7..ef51ff5 100644 --- a/drivers/staging/android/ion/ion.h +++ b/drivers/staging/android/ion/ion.h @@ -17,6 +17,7 @@ #ifndef _ION_H #define _ION_H +#include #include #include #include @@ -26,7 +27,6 @@ #include #include #include -#include #include "../uapi/ion.h" @@ -90,13 +90,13 @@ void ion_buffer_destroy(struct ion_buffer *buffer); /** * struct ion_device - the metadata of the ion device node - * @dev: the actual misc device + * @dev: the actual device * @buffers: an rb tree of all the existing buffers * @buffer_lock: lock protecting the tree of buffers * @lock: rwsem protecting the tree of heaps and clients */ struct ion_device { - struct miscdevice dev; + dev_t devt; struct rb_root buffers; struct mutex buffer_lock; struct rw_semaphore lock; @@ -152,6 +152,8 @@ struct ion_heap_ops { * struct ion_heap - represents a heap in the system * @node: rb node to put the heap on the device's tree of heaps * @dev: back pointer to the ion_device + * @ddev: device structure + * @chrdev: associated character device * @type: type of heap * @ops: ops struct as above * @flags: flags @@ -176,6 +178,8 @@ struct ion_heap_ops { struct ion_heap { struct plist_node node; struct ion_device *dev; + struct device ddev; + struct cdev chrdev; enum ion_heap_type type; struct ion_heap_ops *ops; unsigned long flags; -- 2.7.4