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From: Eric Auger <eric.auger@redhat.com>
To: Jason Gunthorpe <jgg@nvidia.com>, David Airlie <airlied@linux.ie>,
	Tony Krowiak <akrowiak@linux.ibm.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Christian Borntraeger <borntraeger@de.ibm.com>,
	Cornelia Huck <cohuck@redhat.com>,
	Jonathan Corbet <corbet@lwn.net>, Daniel Vetter <daniel@ffwll.ch>,
	Diana Craciun <diana.craciun@oss.nxp.com>,
	dri-devel@lists.freedesktop.org,
	Eric Farman <farman@linux.ibm.com>,
	Harald Freudenberger <freude@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Heiko Carstens <hca@linux.ibm.com>,
	intel-gfx@lists.freedesktop.org,
	intel-gvt-dev@lists.freedesktop.org,
	Jani Nikula <jani.nikula@linux.intel.com>,
	Jason Herne <jjherne@linux.ibm.com>,
	Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
	kvm@vger.kernel.org, Kirti Wankhede <kwankhede@nvidia.com>,
	linux-doc@vger.kernel.org, linux-s390@vger.kernel.org,
	Matthew Rosato <mjrosato@linux.ibm.com>,
	Peter Oberparleiter <oberpar@linux.ibm.com>,
	Halil Pasic <pasic@linux.ibm.com>,
	Rodrigo Vivi <rodrigo.vivi@intel.com>,
	Vineeth Vijayan <vneethv@linux.ibm.com>,
	Zhi Wang <zhi.a.wang@intel.com>
Cc: "Raj, Ashok" <ashok.raj@intel.com>,
	Christoph Hellwig <hch@lst.de>,
	Leon Romanovsky <leonro@nvidia.com>,
	Max Gurtovoy <mgurtovoy@nvidia.com>,
	Yishai Hadas <yishaih@nvidia.com>,
	Zhenyu Wang <zhenyuw@linux.intel.com>
Subject: Re: [Intel-gfx] [PATCH v3 07/14] vfio/platform: Use open_device() instead of open coding a refcnt scheme
Date: Thu, 5 Aug 2021 14:37:09 +0200	[thread overview]
Message-ID: <17c13ccc-8a4a-d784-4237-0014ade1f4fc@redhat.com> (raw)
In-Reply-To: <7-v3-6c9e19cc7d44+15613-vfio_reflck_jgg@nvidia.com>

Hi Jason,

On 7/29/21 2:49 AM, Jason Gunthorpe wrote:
> Platform simply wants to run some code when the device is first
> opened/last closed. Use the core framework and locking for this.  Aside
> from removing a bit of code this narrows the locking scope from a global
> lock.
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
> Reviewed-by: Cornelia Huck <cohuck@redhat.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Thanks

Eric

> ---
>  drivers/vfio/platform/vfio_platform_common.c  | 79 ++++++++-----------
>  drivers/vfio/platform/vfio_platform_private.h |  1 -
>  2 files changed, 32 insertions(+), 48 deletions(-)
>
> diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
> index bdde8605178cd2..6af7ce7d619c25 100644
> --- a/drivers/vfio/platform/vfio_platform_common.c
> +++ b/drivers/vfio/platform/vfio_platform_common.c
> @@ -218,65 +218,52 @@ static int vfio_platform_call_reset(struct vfio_platform_device *vdev,
>  	return -EINVAL;
>  }
>  
> -static void vfio_platform_release(struct vfio_device *core_vdev)
> +static void vfio_platform_close_device(struct vfio_device *core_vdev)
>  {
>  	struct vfio_platform_device *vdev =
>  		container_of(core_vdev, struct vfio_platform_device, vdev);
> +	const char *extra_dbg = NULL;
> +	int ret;
>  
> -	mutex_lock(&driver_lock);
> -
> -	if (!(--vdev->refcnt)) {
> -		const char *extra_dbg = NULL;
> -		int ret;
> -
> -		ret = vfio_platform_call_reset(vdev, &extra_dbg);
> -		if (ret && vdev->reset_required) {
> -			dev_warn(vdev->device, "reset driver is required and reset call failed in release (%d) %s\n",
> -				 ret, extra_dbg ? extra_dbg : "");
> -			WARN_ON(1);
> -		}
> -		pm_runtime_put(vdev->device);
> -		vfio_platform_regions_cleanup(vdev);
> -		vfio_platform_irq_cleanup(vdev);
> +	ret = vfio_platform_call_reset(vdev, &extra_dbg);
> +	if (WARN_ON(ret && vdev->reset_required)) {
> +		dev_warn(
> +			vdev->device,
> +			"reset driver is required and reset call failed in release (%d) %s\n",
> +			ret, extra_dbg ? extra_dbg : "");
>  	}
> -
> -	mutex_unlock(&driver_lock);
> +	pm_runtime_put(vdev->device);
> +	vfio_platform_regions_cleanup(vdev);
> +	vfio_platform_irq_cleanup(vdev);
>  }
>  
> -static int vfio_platform_open(struct vfio_device *core_vdev)
> +static int vfio_platform_open_device(struct vfio_device *core_vdev)
>  {
>  	struct vfio_platform_device *vdev =
>  		container_of(core_vdev, struct vfio_platform_device, vdev);
> +	const char *extra_dbg = NULL;
>  	int ret;
>  
> -	mutex_lock(&driver_lock);
> -
> -	if (!vdev->refcnt) {
> -		const char *extra_dbg = NULL;
> -
> -		ret = vfio_platform_regions_init(vdev);
> -		if (ret)
> -			goto err_reg;
> +	ret = vfio_platform_regions_init(vdev);
> +	if (ret)
> +		return ret;
>  
> -		ret = vfio_platform_irq_init(vdev);
> -		if (ret)
> -			goto err_irq;
> +	ret = vfio_platform_irq_init(vdev);
> +	if (ret)
> +		goto err_irq;
>  
> -		ret = pm_runtime_get_sync(vdev->device);
> -		if (ret < 0)
> -			goto err_rst;
> +	ret = pm_runtime_get_sync(vdev->device);
> +	if (ret < 0)
> +		goto err_rst;
>  
> -		ret = vfio_platform_call_reset(vdev, &extra_dbg);
> -		if (ret && vdev->reset_required) {
> -			dev_warn(vdev->device, "reset driver is required and reset call failed in open (%d) %s\n",
> -				 ret, extra_dbg ? extra_dbg : "");
> -			goto err_rst;
> -		}
> +	ret = vfio_platform_call_reset(vdev, &extra_dbg);
> +	if (ret && vdev->reset_required) {
> +		dev_warn(
> +			vdev->device,
> +			"reset driver is required and reset call failed in open (%d) %s\n",
> +			ret, extra_dbg ? extra_dbg : "");
> +		goto err_rst;
>  	}
> -
> -	vdev->refcnt++;
> -
> -	mutex_unlock(&driver_lock);
>  	return 0;
>  
>  err_rst:
> @@ -284,8 +271,6 @@ static int vfio_platform_open(struct vfio_device *core_vdev)
>  	vfio_platform_irq_cleanup(vdev);
>  err_irq:
>  	vfio_platform_regions_cleanup(vdev);
> -err_reg:
> -	mutex_unlock(&driver_lock);
>  	return ret;
>  }
>  
> @@ -616,8 +601,8 @@ static int vfio_platform_mmap(struct vfio_device *core_vdev, struct vm_area_stru
>  
>  static const struct vfio_device_ops vfio_platform_ops = {
>  	.name		= "vfio-platform",
> -	.open		= vfio_platform_open,
> -	.release	= vfio_platform_release,
> +	.open_device	= vfio_platform_open_device,
> +	.close_device	= vfio_platform_close_device,
>  	.ioctl		= vfio_platform_ioctl,
>  	.read		= vfio_platform_read,
>  	.write		= vfio_platform_write,
> diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
> index dfb834c1365946..520d2a8e8375b2 100644
> --- a/drivers/vfio/platform/vfio_platform_private.h
> +++ b/drivers/vfio/platform/vfio_platform_private.h
> @@ -48,7 +48,6 @@ struct vfio_platform_device {
>  	u32				num_regions;
>  	struct vfio_platform_irq	*irqs;
>  	u32				num_irqs;
> -	int				refcnt;
>  	struct mutex			igate;
>  	const char			*compat;
>  	const char			*acpihid;


  reply	other threads:[~2021-08-05 12:37 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-29  0:49 [Intel-gfx] [PATCH v3 00/14] Provide core infrastructure for managing open/release Jason Gunthorpe
2021-07-29  0:49 ` [Intel-gfx] [PATCH v3 01/14] vfio/samples: Remove module get/put Jason Gunthorpe
2021-07-29  0:49 ` [Intel-gfx] [PATCH v3 02/14] vfio/mbochs: Fix missing error unwind of mbochs_used_mbytes Jason Gunthorpe
2021-07-29  7:21   ` Christoph Hellwig
2021-07-29  0:49 ` [Intel-gfx] [PATCH v3 03/14] vfio: Introduce a vfio_uninit_group_dev() API call Jason Gunthorpe
2021-07-29  0:49 ` [Intel-gfx] [PATCH v3 04/14] vfio: Provide better generic support for open/release vfio_device_ops Jason Gunthorpe
2021-07-29  7:26   ` Christoph Hellwig
2021-07-29  0:49 ` [Intel-gfx] [PATCH v3 05/14] vfio/samples: Delete useless open/close Jason Gunthorpe
2021-07-29  0:49 ` [Intel-gfx] [PATCH v3 06/14] vfio/fsl: Move to the device set infrastructure Jason Gunthorpe
2021-07-29  0:49 ` [Intel-gfx] [PATCH v3 07/14] vfio/platform: Use open_device() instead of open coding a refcnt scheme Jason Gunthorpe
2021-08-05 12:37   ` Eric Auger [this message]
2021-07-29  0:49 ` [Intel-gfx] [PATCH v3 08/14] vfio/pci: Move to the device set infrastructure Jason Gunthorpe
2021-07-29  0:49 ` [Intel-gfx] [PATCH v3 09/14] vfio/pci: Change vfio_pci_try_bus_reset() to use the dev_set Jason Gunthorpe
2021-07-29  7:30   ` Christoph Hellwig
2021-08-03 16:34   ` Alex Williamson
2021-08-03 16:41     ` Jason Gunthorpe
2021-08-03 16:52       ` Alex Williamson
2021-08-05 11:47         ` Jason Gunthorpe
2021-08-05 17:33           ` Alex Williamson
2021-08-05 23:05             ` Jason Gunthorpe
2021-07-29  0:49 ` [Intel-gfx] [PATCH v3 10/14] vfio/pci: Reorganize VFIO_DEVICE_PCI_HOT_RESET to use the device set Jason Gunthorpe
2021-07-29  0:49 ` [Intel-gfx] [PATCH v3 11/14] vfio/mbochs: Fix close when multiple device FDs are open Jason Gunthorpe
2021-07-29  0:49 ` [Intel-gfx] [PATCH v3 12/14] vfio/ap, ccw: Fix open/close " Jason Gunthorpe
2021-07-29  0:49 ` [Intel-gfx] [PATCH v3 13/14] vfio/gvt: " Jason Gunthorpe
2021-07-29  0:49 ` [Intel-gfx] [PATCH v3 14/14] vfio: Remove struct vfio_device_ops open/release Jason Gunthorpe
2021-07-29  2:13 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for Provide core infrastructure for managing open/release (rev7) Patchwork
2021-07-29  2:37 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2021-07-29  8:16 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork
2021-08-05 14:26 ` [Intel-gfx] ✗ Fi.CI.BUILD: failure for Provide core infrastructure for managing open/release (rev8) Patchwork

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