2017-10-18 22:07 GMT+02:00 Laura Abbott <labbott@xxxxxxxxxx>:
> On 09/27/2017 06:20 AM, Benjamin Gaignard wrote:
>> diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
>> index 93e2c90..092b24c 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;
>>
>> @@ -537,15 +539,28 @@ 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)
>> +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.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 ret;
>> +
>> spin_lock_init(&heap->free_lock);
>> heap->free_list_size = 0;
>>
>> @@ -583,6 +598,8 @@ void ion_device_add_heap(struct ion_heap *heap)
>>
>> dev->heap_cnt++;
>> up_write(&dev->lock);
>> +
>> + return ret;
>> }
>> EXPORT_SYMBOL(ion_device_add_heap);
>>
>> @@ -595,6 +612,7 @@ 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.fops = &ion_fops;
>> @@ -605,6 +623,17 @@ static int ion_device_create(void)
>> kfree(idev);
>> return ret;
>> }
>> +#endif
>> +
>> + ret = alloc_chrdev_region(&idev->devt, 0, ION_DEV_MAX, "ion");
>> + if (ret) {
>> + pr_err("ion: unable to allocate device\n");
>> +#ifdef CONFIG_ION_LEGACY_DEVICE_API
>> + misc_deregister(&idev->dev);
>> +#endif
>> + kfree(idev);
>> + return ret;
>> + }
>>
>> idev->debug_root = debugfs_create_dir("ion", NULL);
>> if (!idev->debug_root) {
>
> I'm not 100% sure about the device hierarchy here. We're
> ending up with devices at the root of /sys/devices
>
> /sys/devices # ls
> breakpoint ion0 ion1 ion2 platform software system virtual
>
> and the Android init system doesn't pick this up. I'll
> admit to being out of my area here but I don't think
> this looks quite right.
>
You are right it is because ion devices are parentless so they
directly put under /sys/devices directory. I will give them platform_bus
as parent to solve that problem.
Benjamin
> Thanks,
> Laura
>
>
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