vfio/fsl-mc: Implement VFIO_DEVICE_GET_REGION_INFO ioctl call (df747bcd) · Commits · 戴 / test

drivers/vfio/fsl-mc/vfio_fsl_mc.c

+78 −1

Original line number	Diff line number	Diff line
		@@ -17,16 +17,71 @@

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

		return 0;
		}

		static void vfio_fsl_mc_regions_cleanup(struct vfio_fsl_mc_device *vdev)
		{
		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 +114,25 @@ 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 >= mc_dev->obj_desc.region_count)
		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:
		{
		@@ -210,6 +283,8 @@ static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev)
		if (ret)
		goto out_group_dev;

		mutex_init(&vdev->driver_lock);

		return 0;

		out_group_dev:
		@@ -228,6 +303,8 @@ static int vfio_fsl_mc_remove(struct fsl_mc_device *mc_dev)
		if (!vdev)
		return -EINVAL;

		mutex_destroy(&vdev->driver_lock);

		if (is_fsl_mc_bus_dprc(mc_dev)) {
		dprc_remove_devices(mc_dev, NULL, 0);
		dprc_cleanup(mc_dev);

drivers/vfio/fsl-mc/vfio_fsl_mc_private.h

+18 −0

Original line number	Diff line number	Diff line
		@@ -7,9 +7,27 @@
		#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;
		struct vfio_fsl_mc_region *regions;
		struct mutex driver_lock;
		};

		#endif /* VFIO_FSL_MC_PRIVATE_H */

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