diff mbox series

[v4,04/10] vfio/fsl-mc: Implement VFIO_DEVICE_GET_REGION_INFO ioctl call

Message ID 20200826093315.5279-5-diana.craciun@oss.nxp.com (mailing list archive)
State New, archived
Headers show
Series vfio/fsl-mc: VFIO support for FSL-MC device | expand

Commit Message

Diana Madalina Craciun Aug. 26, 2020, 9:33 a.m. UTC 
Expose to userspace information about the memory regions.

Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
Signed-off-by: Diana Craciun <diana.craciun@oss.nxp.com>
---
 drivers/vfio/fsl-mc/vfio_fsl_mc.c         | 79 ++++++++++++++++++++++-
 drivers/vfio/fsl-mc/vfio_fsl_mc_private.h | 19 ++++++
 2 files changed, 97 insertions(+), 1 deletion(-)

Comments

Eric Auger Sept. 3, 2020, 3:16 p.m. UTC | #1 
Hi Diana,

On 8/26/20 11:33 AM, Diana Craciun wrote:
> Expose to userspace information about the memory regions.
> 
> Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
> Signed-off-by: Diana Craciun <diana.craciun@oss.nxp.com>
> ---
>  drivers/vfio/fsl-mc/vfio_fsl_mc.c         | 79 ++++++++++++++++++++++-
>  drivers/vfio/fsl-mc/vfio_fsl_mc_private.h | 19 ++++++
>  2 files changed, 97 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
> index 5a5460d01f00..093b8d68496c 100644
> --- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
> +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
> @@ -17,16 +17,72 @@
>  
>  static struct fsl_mc_driver vfio_fsl_mc_driver;
>  
> +static int vfio_fsl_mc_regions_init(struct vfio_fsl_mc_device *vdev)
> +{
> +	struct fsl_mc_device *mc_dev = vdev->mc_dev;
> +	int count = mc_dev->obj_desc.region_count;
> +	int i;
> +
> +	vdev->regions = kcalloc(count, sizeof(struct vfio_fsl_mc_region),
> +				GFP_KERNEL);
> +	if (!vdev->regions)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < count; i++) {
> +		struct resource *res = &mc_dev->regions[i];
> +
> +		vdev->regions[i].addr = res->start;
> +		vdev->regions[i].size = resource_size(res);
> +		vdev->regions[i].flags = 0;
why 0? I see in
> +	}
> +
> +	vdev->num_regions = mc_dev->obj_desc.region_count;
nit: you can use count directly fsl-mc-bus.c that flags can take
meaningful values
> +	return 0;
> +}
> +
> +static void vfio_fsl_mc_regions_cleanup(struct vfio_fsl_mc_device *vdev)
> +{
> +	vdev->num_regions = 0;
> +	kfree(vdev->regions);
> +}
> +
>  static int vfio_fsl_mc_open(void *device_data)
>  {
> +	struct vfio_fsl_mc_device *vdev = device_data;
> +	int ret;
> +
>  	if (!try_module_get(THIS_MODULE))
>  		return -ENODEV;
>  
> +	mutex_lock(&vdev->driver_lock);
> +	if (!vdev->refcnt) {
> +		ret = vfio_fsl_mc_regions_init(vdev);
> +		if (ret)
> +			goto err_reg_init;
> +	}
> +	vdev->refcnt++;
> +
> +	mutex_unlock(&vdev->driver_lock);
> +
>  	return 0;
> +
> +err_reg_init:
> +	mutex_unlock(&vdev->driver_lock);
> +	module_put(THIS_MODULE);
> +	return ret;
>  }
>  
>  static void vfio_fsl_mc_release(void *device_data)
>  {
> +	struct vfio_fsl_mc_device *vdev = device_data;
> +
> +	mutex_lock(&vdev->driver_lock);
> +
> +	if (!(--vdev->refcnt))
> +		vfio_fsl_mc_regions_cleanup(vdev);
> +
> +	mutex_unlock(&vdev->driver_lock);
> +
>  	module_put(THIS_MODULE);
>  }
>  
> @@ -59,7 +115,25 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
>  	}
>  	case VFIO_DEVICE_GET_REGION_INFO:
>  	{
> -		return -ENOTTY;
> +		struct vfio_region_info info;
> +
> +		minsz = offsetofend(struct vfio_region_info, offset);
> +
> +		if (copy_from_user(&info, (void __user *)arg, minsz))
> +			return -EFAULT;
> +
> +		if (info.argsz < minsz)
> +			return -EINVAL;
> +
> +		if (info.index >= vdev->num_regions)
> +			return -EINVAL;
> +
> +		/* map offset to the physical address  */
> +		info.offset = VFIO_FSL_MC_INDEX_TO_OFFSET(info.index);
> +		info.size = vdev->regions[info.index].size;
> +		info.flags = vdev->regions[info.index].flags;
> +
> +		return copy_to_user((void __user *)arg, &info, minsz);
>  	}
>  	case VFIO_DEVICE_GET_IRQ_INFO:
>  	{
> @@ -204,6 +278,7 @@ static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev)
>  		vfio_iommu_group_put(group, dev);
>  		return ret;
>  	}
> +	mutex_init(&vdev->driver_lock);
>  
>  	return ret;
>  }
> @@ -227,6 +302,8 @@ static int vfio_fsl_mc_remove(struct fsl_mc_device *mc_dev)
>  
>  	mc_dev->mc_io = NULL;
>  
> +	mutex_destroy(&vdev->driver_lock);
> +
>  	vfio_iommu_group_put(mc_dev->dev.iommu_group, dev);
>  
>  	return 0;
> diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
> index 37d61eaa58c8..818dfd3df4db 100644
> --- a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
> +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
> @@ -7,9 +7,28 @@
>  #ifndef VFIO_FSL_MC_PRIVATE_H
>  #define VFIO_FSL_MC_PRIVATE_H
>  
> +#define VFIO_FSL_MC_OFFSET_SHIFT    40
> +#define VFIO_FSL_MC_OFFSET_MASK (((u64)(1) << VFIO_FSL_MC_OFFSET_SHIFT) - 1)
> +
> +#define VFIO_FSL_MC_OFFSET_TO_INDEX(off) ((off) >> VFIO_FSL_MC_OFFSET_SHIFT)
> +
> +#define VFIO_FSL_MC_INDEX_TO_OFFSET(index)	\
> +	((u64)(index) << VFIO_FSL_MC_OFFSET_SHIFT)
> +
> +struct vfio_fsl_mc_region {
> +	u32			flags;
> +	u32			type;
> +	u64			addr;
> +	resource_size_t		size;
> +};
> +
>  struct vfio_fsl_mc_device {
>  	struct fsl_mc_device		*mc_dev;
>  	struct notifier_block        nb;
> +	int				refcnt;
> +	u32				num_regions;
> +	struct vfio_fsl_mc_region	*regions;
> +	struct mutex driver_lock;
>  };
>  
>  #endif /* VFIO_FSL_MC_PRIVATE_H */
> 
Otherwise looks good to me

Thanks

Eric
Eric Auger Sept. 3, 2020, 3:22 p.m. UTC | #2 
Hi Diana,

On 9/3/20 5:16 PM, Auger Eric wrote:
> Hi Diana,
> 
> On 8/26/20 11:33 AM, Diana Craciun wrote:
>> Expose to userspace information about the memory regions.
>>
>> Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
>> Signed-off-by: Diana Craciun <diana.craciun@oss.nxp.com>
>> ---
>>  drivers/vfio/fsl-mc/vfio_fsl_mc.c         | 79 ++++++++++++++++++++++-
>>  drivers/vfio/fsl-mc/vfio_fsl_mc_private.h | 19 ++++++
>>  2 files changed, 97 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
>> index 5a5460d01f00..093b8d68496c 100644
>> --- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
>> +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
>> @@ -17,16 +17,72 @@
>>  
>>  static struct fsl_mc_driver vfio_fsl_mc_driver;
>>  
>> +static int vfio_fsl_mc_regions_init(struct vfio_fsl_mc_device *vdev)
>> +{
>> +	struct fsl_mc_device *mc_dev = vdev->mc_dev;
>> +	int count = mc_dev->obj_desc.region_count;
>> +	int i;
>> +
>> +	vdev->regions = kcalloc(count, sizeof(struct vfio_fsl_mc_region),
>> +				GFP_KERNEL);
>> +	if (!vdev->regions)
>> +		return -ENOMEM;
>> +
>> +	for (i = 0; i < count; i++) {
>> +		struct resource *res = &mc_dev->regions[i];
>> +
>> +		vdev->regions[i].addr = res->start;
>> +		vdev->regions[i].size = resource_size(res);
>> +		vdev->regions[i].flags = 0;
> why 0? I see in
>> +	}
>> +
>> +	vdev->num_regions = mc_dev->obj_desc.region_count;
> nit: you can use count directly fsl-mc-bus.c that flags can take
> meaningful values
Sorry I missed flags and types. So you may set the type in this patch
instead of in next patch?

vdev->regions[i].type = mc_dev->regions[i].flags & IORESOURCE_BITS;

Eric
>> +	return 0;
>> +}
>> +
>> +static void vfio_fsl_mc_regions_cleanup(struct vfio_fsl_mc_device *vdev)
>> +{
>> +	vdev->num_regions = 0;
>> +	kfree(vdev->regions);
>> +}
>> +
>>  static int vfio_fsl_mc_open(void *device_data)
>>  {
>> +	struct vfio_fsl_mc_device *vdev = device_data;
>> +	int ret;
>> +
>>  	if (!try_module_get(THIS_MODULE))
>>  		return -ENODEV;
>>  
>> +	mutex_lock(&vdev->driver_lock);
>> +	if (!vdev->refcnt) {
>> +		ret = vfio_fsl_mc_regions_init(vdev);
>> +		if (ret)
>> +			goto err_reg_init;
>> +	}
>> +	vdev->refcnt++;
>> +
>> +	mutex_unlock(&vdev->driver_lock);
>> +
>>  	return 0;
>> +
>> +err_reg_init:
>> +	mutex_unlock(&vdev->driver_lock);
>> +	module_put(THIS_MODULE);
>> +	return ret;
>>  }
>>  
>>  static void vfio_fsl_mc_release(void *device_data)
>>  {
>> +	struct vfio_fsl_mc_device *vdev = device_data;
>> +
>> +	mutex_lock(&vdev->driver_lock);
>> +
>> +	if (!(--vdev->refcnt))
>> +		vfio_fsl_mc_regions_cleanup(vdev);
>> +
>> +	mutex_unlock(&vdev->driver_lock);
>> +
>>  	module_put(THIS_MODULE);
>>  }
>>  
>> @@ -59,7 +115,25 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
>>  	}
>>  	case VFIO_DEVICE_GET_REGION_INFO:
>>  	{
>> -		return -ENOTTY;
>> +		struct vfio_region_info info;
>> +
>> +		minsz = offsetofend(struct vfio_region_info, offset);
>> +
>> +		if (copy_from_user(&info, (void __user *)arg, minsz))
>> +			return -EFAULT;
>> +
>> +		if (info.argsz < minsz)
>> +			return -EINVAL;
>> +
>> +		if (info.index >= vdev->num_regions)
>> +			return -EINVAL;
>> +
>> +		/* map offset to the physical address  */
>> +		info.offset = VFIO_FSL_MC_INDEX_TO_OFFSET(info.index);
>> +		info.size = vdev->regions[info.index].size;
>> +		info.flags = vdev->regions[info.index].flags;
>> +
>> +		return copy_to_user((void __user *)arg, &info, minsz);
>>  	}
>>  	case VFIO_DEVICE_GET_IRQ_INFO:
>>  	{
>> @@ -204,6 +278,7 @@ static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev)
>>  		vfio_iommu_group_put(group, dev);
>>  		return ret;
>>  	}
>> +	mutex_init(&vdev->driver_lock);
>>  
>>  	return ret;
>>  }
>> @@ -227,6 +302,8 @@ static int vfio_fsl_mc_remove(struct fsl_mc_device *mc_dev)
>>  
>>  	mc_dev->mc_io = NULL;
>>  
>> +	mutex_destroy(&vdev->driver_lock);
>> +
>>  	vfio_iommu_group_put(mc_dev->dev.iommu_group, dev);
>>  
>>  	return 0;
>> diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
>> index 37d61eaa58c8..818dfd3df4db 100644
>> --- a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
>> +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
>> @@ -7,9 +7,28 @@
>>  #ifndef VFIO_FSL_MC_PRIVATE_H
>>  #define VFIO_FSL_MC_PRIVATE_H
>>  
>> +#define VFIO_FSL_MC_OFFSET_SHIFT    40
>> +#define VFIO_FSL_MC_OFFSET_MASK (((u64)(1) << VFIO_FSL_MC_OFFSET_SHIFT) - 1)
>> +
>> +#define VFIO_FSL_MC_OFFSET_TO_INDEX(off) ((off) >> VFIO_FSL_MC_OFFSET_SHIFT)
>> +
>> +#define VFIO_FSL_MC_INDEX_TO_OFFSET(index)	\
>> +	((u64)(index) << VFIO_FSL_MC_OFFSET_SHIFT)
>> +
>> +struct vfio_fsl_mc_region {
>> +	u32			flags;
>> +	u32			type;
>> +	u64			addr;
>> +	resource_size_t		size;
>> +};
>> +
>>  struct vfio_fsl_mc_device {
>>  	struct fsl_mc_device		*mc_dev;
>>  	struct notifier_block        nb;
>> +	int				refcnt;
>> +	u32				num_regions;
>> +	struct vfio_fsl_mc_region	*regions;
>> +	struct mutex driver_lock;
>>  };
>>  
>>  #endif /* VFIO_FSL_MC_PRIVATE_H */
>>
> Otherwise looks good to me
> 
> Thanks
> 
> Eric
>
diff mbox series

Patch

diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
index 5a5460d01f00..093b8d68496c 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
@@ -17,16 +17,72 @@ 
 
 static struct fsl_mc_driver vfio_fsl_mc_driver;
 
+static int vfio_fsl_mc_regions_init(struct vfio_fsl_mc_device *vdev)
+{
+	struct fsl_mc_device *mc_dev = vdev->mc_dev;
+	int count = mc_dev->obj_desc.region_count;
+	int i;
+
+	vdev->regions = kcalloc(count, sizeof(struct vfio_fsl_mc_region),
+				GFP_KERNEL);
+	if (!vdev->regions)
+		return -ENOMEM;
+
+	for (i = 0; i < count; i++) {
+		struct resource *res = &mc_dev->regions[i];
+
+		vdev->regions[i].addr = res->start;
+		vdev->regions[i].size = resource_size(res);
+		vdev->regions[i].flags = 0;
+	}
+
+	vdev->num_regions = mc_dev->obj_desc.region_count;
+	return 0;
+}
+
+static void vfio_fsl_mc_regions_cleanup(struct vfio_fsl_mc_device *vdev)
+{
+	vdev->num_regions = 0;
+	kfree(vdev->regions);
+}
+
 static int vfio_fsl_mc_open(void *device_data)
 {
+	struct vfio_fsl_mc_device *vdev = device_data;
+	int ret;
+
 	if (!try_module_get(THIS_MODULE))
 		return -ENODEV;
 
+	mutex_lock(&vdev->driver_lock);
+	if (!vdev->refcnt) {
+		ret = vfio_fsl_mc_regions_init(vdev);
+		if (ret)
+			goto err_reg_init;
+	}
+	vdev->refcnt++;
+
+	mutex_unlock(&vdev->driver_lock);
+
 	return 0;
+
+err_reg_init:
+	mutex_unlock(&vdev->driver_lock);
+	module_put(THIS_MODULE);
+	return ret;
 }
 
 static void vfio_fsl_mc_release(void *device_data)
 {
+	struct vfio_fsl_mc_device *vdev = device_data;
+
+	mutex_lock(&vdev->driver_lock);
+
+	if (!(--vdev->refcnt))
+		vfio_fsl_mc_regions_cleanup(vdev);
+
+	mutex_unlock(&vdev->driver_lock);
+
 	module_put(THIS_MODULE);
 }
 
@@ -59,7 +115,25 @@  static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
 	}
 	case VFIO_DEVICE_GET_REGION_INFO:
 	{
-		return -ENOTTY;
+		struct vfio_region_info info;
+
+		minsz = offsetofend(struct vfio_region_info, offset);
+
+		if (copy_from_user(&info, (void __user *)arg, minsz))
+			return -EFAULT;
+
+		if (info.argsz < minsz)
+			return -EINVAL;
+
+		if (info.index >= vdev->num_regions)
+			return -EINVAL;
+
+		/* map offset to the physical address  */
+		info.offset = VFIO_FSL_MC_INDEX_TO_OFFSET(info.index);
+		info.size = vdev->regions[info.index].size;
+		info.flags = vdev->regions[info.index].flags;
+
+		return copy_to_user((void __user *)arg, &info, minsz);
 	}
 	case VFIO_DEVICE_GET_IRQ_INFO:
 	{
@@ -204,6 +278,7 @@  static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev)
 		vfio_iommu_group_put(group, dev);
 		return ret;
 	}
+	mutex_init(&vdev->driver_lock);
 
 	return ret;
 }
@@ -227,6 +302,8 @@  static int vfio_fsl_mc_remove(struct fsl_mc_device *mc_dev)
 
 	mc_dev->mc_io = NULL;
 
+	mutex_destroy(&vdev->driver_lock);
+
 	vfio_iommu_group_put(mc_dev->dev.iommu_group, dev);
 
 	return 0;
diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
index 37d61eaa58c8..818dfd3df4db 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
@@ -7,9 +7,28 @@ 
 #ifndef VFIO_FSL_MC_PRIVATE_H
 #define VFIO_FSL_MC_PRIVATE_H
 
+#define VFIO_FSL_MC_OFFSET_SHIFT    40
+#define VFIO_FSL_MC_OFFSET_MASK (((u64)(1) << VFIO_FSL_MC_OFFSET_SHIFT) - 1)
+
+#define VFIO_FSL_MC_OFFSET_TO_INDEX(off) ((off) >> VFIO_FSL_MC_OFFSET_SHIFT)
+
+#define VFIO_FSL_MC_INDEX_TO_OFFSET(index)	\
+	((u64)(index) << VFIO_FSL_MC_OFFSET_SHIFT)
+
+struct vfio_fsl_mc_region {
+	u32			flags;
+	u32			type;
+	u64			addr;
+	resource_size_t		size;
+};
+
 struct vfio_fsl_mc_device {
 	struct fsl_mc_device		*mc_dev;
 	struct notifier_block        nb;
+	int				refcnt;
+	u32				num_regions;
+	struct vfio_fsl_mc_region	*regions;
+	struct mutex driver_lock;
 };
 
 #endif /* VFIO_FSL_MC_PRIVATE_H */