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SubjectRe: [PATCH v6 2/2] staging: ion: create one device entry per heap
2017-11-09 22:17 GMT+01:00 Laura Abbott <labbott@redhat.com>:
> On 11/06/2017 07:59 AM, Benjamin Gaignard wrote:
>>
>> Instead a getting only 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.
>>
>
> With this patch, sysfs looks like:
>
> $ ls /sys/devices/
> breakpoint ion platform software system virtual
>
> From an Ion perspective, you can have
>
> Acked-by: Laura Abbott <labbott@redhat.com>
>
> Another Ack for the device model stuff would be good but I'll
> assume deafening silence means nobody hates it.

Greg, can we get your point of view of this ?

Thanks,
Benjamin

>
> Thanks,
> Laura
>
>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
>> ---
>> drivers/staging/android/TODO | 1 -
>> drivers/staging/android/ion/Kconfig | 7 ++++
>> drivers/staging/android/ion/ion-ioctl.c | 18 ++++++++--
>> drivers/staging/android/ion/ion.c | 62
>> +++++++++++++++++++++++++++++----
>> drivers/staging/android/ion/ion.h | 15 ++++++--
>> 5 files changed, 91 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/staging/android/TODO b/drivers/staging/android/TODO
>> index 687e0ea..8a11931 100644
>> --- a/drivers/staging/android/TODO
>> +++ b/drivers/staging/android/TODO
>> @@ -8,7 +8,6 @@ TODO:
>> ion/
>> - Add dt-bindings for remaining heaps (chunk and carveout heaps). This
>> would
>> involve putting appropriate bindings in a memory node for Ion to
>> find.
>> - - Split /dev/ion up into multiple nodes (e.g. /dev/ion/heap0)
>> - Better test framework (integration with VGEM was suggested)
>> Please send patches to Greg Kroah-Hartman <greg@kroah.com> and Cc:
>> diff --git a/drivers/staging/android/ion/Kconfig
>> b/drivers/staging/android/ion/Kconfig
>> index a517b2d..cb4666e 100644
>> --- a/drivers/staging/android/ion/Kconfig
>> +++ b/drivers/staging/android/ion/Kconfig
>> @@ -10,6 +10,13 @@ menuconfig ION
>> If you're not using Android its probably safe to
>> say N here.
>> +config ION_LEGACY_DEVICE_API
>> + bool "Keep using Ion legacy misc device API"
>> + depends on ION
>> + help
>> + Choose this option to keep using Ion legacy misc device API
>> + i.e. /dev/ion
>> +
>> config ION_SYSTEM_HEAP
>> bool "Ion system heap"
>> depends on ION
>> diff --git a/drivers/staging/android/ion/ion-ioctl.c
>> b/drivers/staging/android/ion/ion-ioctl.c
>> index e26b786..bb5c77b 100644
>> --- a/drivers/staging/android/ion/ion-ioctl.c
>> +++ b/drivers/staging/android/ion/ion-ioctl.c
>> @@ -25,7 +25,8 @@ 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)
>> {
>> switch (cmd) {
>> case ION_IOC_HEAP_QUERY:
>> @@ -34,6 +35,19 @@ static int validate_ioctl_arg(unsigned int cmd, union
>> ion_ioctl_arg *arg)
>> arg->query.reserved2 )
>> return -EINVAL;
>> break;
>> +
>> + case ION_IOC_ALLOC:
>> + {
>> + int mask = 1 << iminor(filp->f_inode);
>> +
>> +#ifdef CONFIG_ION_LEGACY_DEVICE_API
>> + if (imajor(filp->f_inode) == MISC_MAJOR)
>> + return 0;
>> +#endif
>> + if (!(arg->allocation.heap_id_mask & mask))
>> + return -EINVAL;
>> + break;
>> + }
>> default:
>> break;
>> }
>> @@ -69,7 +83,7 @@ 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 fda9756..2c2568b 100644
>> --- a/drivers/staging/android/ion/ion.c
>> +++ b/drivers/staging/android/ion/ion.c
>> @@ -40,6 +40,9 @@
>> #include "ion.h"
>> +#define ION_DEV_MAX 32
>> +#define ION_NAME "ion"
>> +
>> static struct ion_device *internal_dev;
>> static int heap_id;
>> @@ -535,15 +538,38 @@ static int debug_shrink_get(void *data, u64 *val)
>> DEFINE_SIMPLE_ATTRIBUTE(debug_shrink_fops, debug_shrink_get,
>> debug_shrink_set, "%llu\n");
>> -void ion_device_add_heap(struct ion_heap *heap)
>> +static struct device ion_bus = {
>> + .init_name = ION_NAME,
>> +};
>> +
>> +static struct bus_type ion_bus_type = {
>> + .name = ION_NAME,
>> +};
>> +
>> +int ion_device_add_heap(struct ion_heap *heap)
>> {
>> struct dentry *debug_file;
>> struct ion_device *dev = internal_dev;
>> + int ret = 0;
>> 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.parent = &ion_bus;
>> + heap->ddev.bus = &ion_bus_type;
>> + heap->ddev.devt = MKDEV(MAJOR(internal_dev->devt), heap_id);
>> + dev_set_name(&heap->ddev, ION_NAME"%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 ret;
>> +
>> spin_lock_init(&heap->free_lock);
>> heap->free_list_size = 0;
>> @@ -581,6 +607,8 @@ void ion_device_add_heap(struct ion_heap *heap)
>> dev->heap_cnt++;
>> up_write(&dev->lock);
>> +
>> + return ret;
>> }
>> EXPORT_SYMBOL(ion_device_add_heap);
>> @@ -593,8 +621,9 @@ static int ion_device_create(void)
>> if (!idev)
>> return -ENOMEM;
>> +#ifdef CONFIG_ION_LEGACY_DEVICE_API
>> idev->dev.minor = MISC_DYNAMIC_MINOR;
>> - idev->dev.name = "ion";
>> + idev->dev.name = ION_NAME;
>> idev->dev.fops = &ion_fops;
>> idev->dev.parent = NULL;
>> ret = misc_register(&idev->dev);
>> @@ -603,19 +632,38 @@ static int ion_device_create(void)
>> kfree(idev);
>> return ret;
>> }
>> +#endif
>> - idev->debug_root = debugfs_create_dir("ion", NULL);
>> - if (!idev->debug_root) {
>> + ret = device_register(&ion_bus);
>> + if (ret)
>> + goto clean_misc;
>> +
>> + ret = bus_register(&ion_bus_type);
>> + if (ret)
>> + goto clean_device;
>> +
>> + ret = alloc_chrdev_region(&idev->devt, 0, ION_DEV_MAX, ION_NAME);
>> + if (ret)
>> + goto clean_device;
>> +
>> + idev->debug_root = debugfs_create_dir(ION_NAME, NULL);
>> + if (!idev->debug_root)
>> pr_err("ion: failed to create debugfs root directory.\n");
>> - goto debugfs_done;
>> - }
>> -debugfs_done:
>> idev->buffers = RB_ROOT;
>> mutex_init(&idev->buffer_lock);
>> init_rwsem(&idev->lock);
>> plist_head_init(&idev->heaps);
>> internal_dev = idev;
>> return 0;
>> +
>> +clean_device:
>> + device_unregister(&ion_bus);
>> +clean_misc:
>> +#ifdef CONFIG_ION_LEGACY_DEVICE_API
>> + misc_deregister(&idev->dev);
>> +#endif
>> + kfree(idev);
>> + return ret;
>> }
>> subsys_initcall(ion_device_create);
>> diff --git a/drivers/staging/android/ion/ion.h
>> b/drivers/staging/android/ion/ion.h
>> index f5f9cd6..4869e96 100644
>> --- a/drivers/staging/android/ion/ion.h
>> +++ b/drivers/staging/android/ion/ion.h
>> @@ -17,16 +17,19 @@
>> #ifndef _ION_H
>> #define _ION_H
>> +#include <linux/cdev.h>
>> #include <linux/device.h>
>> #include <linux/dma-direction.h>
>> #include <linux/kref.h>
>> +#ifdef CONFIG_ION_LEGACY_DEVICE_API
>> +#include <linux/miscdevice.h>
>> +#endif
>> #include <linux/mm_types.h>
>> #include <linux/mutex.h>
>> #include <linux/rbtree.h>
>> #include <linux/sched.h>
>> #include <linux/shrinker.h>
>> #include <linux/types.h>
>> -#include <linux/miscdevice.h>
>> #include "../uapi/ion.h"
>> @@ -92,12 +95,16 @@ void ion_buffer_destroy(struct ion_buffer *buffer);
>> /**
>> * struct ion_device - the metadata of the ion device node
>> * @dev: the actual misc device
>> + * @devt: Ion 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 {
>> +#ifdef CONFIG_ION_LEGACY_DEVICE_API
>> struct miscdevice dev;
>> +#endif
>> + dev_t devt;
>> struct rb_root buffers;
>> struct mutex buffer_lock;
>> struct rw_semaphore lock;
>> @@ -153,6 +160,8 @@ 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
>> @@ -177,6 +186,8 @@ 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;
>> @@ -213,7 +224,7 @@ bool ion_buffer_fault_user_mappings(struct ion_buffer
>> *buffer);
>> * ion_device_add_heap - adds a heap to the ion device
>> * @heap: the heap to add
>> */
>> -void ion_device_add_heap(struct ion_heap *heap);
>> +int ion_device_add_heap(struct ion_heap *heap);
>> /**
>> * some helpers for common operations on buffers using the sg_table
>>
>

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