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From: Ira Weiny <ira.weiny@intel.com>
To: Christoph Hellwig <hch@lst.de>
Cc: "Dan Williams" <dan.j.williams@intel.com>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Jason Gunthorpe" <jgg@mellanox.com>,
	"Ben Skeggs" <bskeggs@redhat.com>,
	linux-nvdimm@lists.01.org, linux-pci@vger.kernel.org,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	linux-mm@kvack.org, nouveau@lists.freedesktop.org
Subject: Re: [PATCH 16/25] device-dax: use the dev_pagemap internal refcount
Date: Wed, 26 Jun 2019 14:48:23 -0700
Message-ID: <20190626214823.GD8399@iweiny-DESK2.sc.intel.com> (raw)
In-Reply-To: <20190626122724.13313-17-hch@lst.de>

On Wed, Jun 26, 2019 at 02:27:15PM +0200, Christoph Hellwig wrote:
> The functionality is identical to the one currently open coded in
> device-dax.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Ira Weiny <ira.weiny@intel.com>

> ---
>  drivers/dax/dax-private.h |  4 ----
>  drivers/dax/device.c      | 43 ---------------------------------------
>  2 files changed, 47 deletions(-)
> 
> diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h
> index b4177aafbbd1..c915889d1769 100644
> --- a/drivers/dax/dax-private.h
> +++ b/drivers/dax/dax-private.h
> @@ -43,8 +43,6 @@ struct dax_region {
>   * @target_node: effective numa node if dev_dax memory range is onlined
>   * @dev - device core
>   * @pgmap - pgmap for memmap setup / lifetime (driver owned)
> - * @ref: pgmap reference count (driver owned)
> - * @cmp: @ref final put completion (driver owned)
>   */
>  struct dev_dax {
>  	struct dax_region *region;
> @@ -52,8 +50,6 @@ struct dev_dax {
>  	int target_node;
>  	struct device dev;
>  	struct dev_pagemap pgmap;
> -	struct percpu_ref ref;
> -	struct completion cmp;
>  };
>  
>  static inline struct dev_dax *to_dev_dax(struct device *dev)
> diff --git a/drivers/dax/device.c b/drivers/dax/device.c
> index b5257038c188..1af823b2fe6b 100644
> --- a/drivers/dax/device.c
> +++ b/drivers/dax/device.c
> @@ -14,36 +14,6 @@
>  #include "dax-private.h"
>  #include "bus.h"
>  
> -static struct dev_dax *ref_to_dev_dax(struct percpu_ref *ref)
> -{
> -	return container_of(ref, struct dev_dax, ref);
> -}
> -
> -static void dev_dax_percpu_release(struct percpu_ref *ref)
> -{
> -	struct dev_dax *dev_dax = ref_to_dev_dax(ref);
> -
> -	dev_dbg(&dev_dax->dev, "%s\n", __func__);
> -	complete(&dev_dax->cmp);
> -}
> -
> -static void dev_dax_percpu_exit(struct dev_pagemap *pgmap)
> -{
> -	struct dev_dax *dev_dax = container_of(pgmap, struct dev_dax, pgmap);
> -
> -	dev_dbg(&dev_dax->dev, "%s\n", __func__);
> -	wait_for_completion(&dev_dax->cmp);
> -	percpu_ref_exit(pgmap->ref);
> -}
> -
> -static void dev_dax_percpu_kill(struct dev_pagemap *pgmap)
> -{
> -	struct dev_dax *dev_dax = container_of(pgmap, struct dev_dax, pgmap);
> -
> -	dev_dbg(&dev_dax->dev, "%s\n", __func__);
> -	percpu_ref_kill(pgmap->ref);
> -}
> -
>  static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
>  		const char *func)
>  {
> @@ -441,11 +411,6 @@ static void dev_dax_kill(void *dev_dax)
>  	kill_dev_dax(dev_dax);
>  }
>  
> -static const struct dev_pagemap_ops dev_dax_pagemap_ops = {
> -	.kill		= dev_dax_percpu_kill,
> -	.cleanup	= dev_dax_percpu_exit,
> -};
> -
>  int dev_dax_probe(struct device *dev)
>  {
>  	struct dev_dax *dev_dax = to_dev_dax(dev);
> @@ -463,15 +428,7 @@ int dev_dax_probe(struct device *dev)
>  		return -EBUSY;
>  	}
>  
> -	init_completion(&dev_dax->cmp);
> -	rc = percpu_ref_init(&dev_dax->ref, dev_dax_percpu_release, 0,
> -			GFP_KERNEL);
> -	if (rc)
> -		return rc;
> -
> -	dev_dax->pgmap.ref = &dev_dax->ref;
>  	dev_dax->pgmap.type = MEMORY_DEVICE_DEVDAX;
> -	dev_dax->pgmap.ops = &dev_dax_pagemap_ops;
>  	addr = devm_memremap_pages(dev, &dev_dax->pgmap);
>  	if (IS_ERR(addr))
>  		return PTR_ERR(addr);
> -- 
> 2.20.1
> 
> _______________________________________________
> Linux-nvdimm mailing list
> Linux-nvdimm@lists.01.org
> https://lists.01.org/mailman/listinfo/linux-nvdimm

  reply index

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-26 12:26 dev_pagemap related cleanups v3 Christoph Hellwig
2019-06-26 12:27 ` [PATCH 01/25] mm: remove the unused ARCH_HAS_HMM_DEVICE Kconfig option Christoph Hellwig
2019-06-26 12:27 ` [PATCH 02/25] mm: remove the struct hmm_device infrastructure Christoph Hellwig
2019-06-26 12:27 ` [PATCH 03/25] mm: remove hmm_devmem_add_resource Christoph Hellwig
2019-06-27 16:18   ` Jason Gunthorpe
2019-06-27 16:54     ` Christoph Hellwig
2019-06-26 12:27 ` [PATCH 04/25] mm: remove MEMORY_DEVICE_PUBLIC support Christoph Hellwig
2019-06-26 16:00   ` Dan Williams
2019-06-26 17:14     ` Ira Weiny
2019-06-26 18:49       ` Ira Weiny
2019-06-26 12:27 ` [PATCH 05/25] mm: don't clear ->mapping in hmm_devmem_free Christoph Hellwig
2019-06-26 12:27 ` [PATCH 06/25] mm: export alloc_pages_vma Christoph Hellwig
2019-06-26 12:36   ` Michal Hocko
2019-06-26 12:27 ` [PATCH 07/25] mm: factor out a devm_request_free_mem_region helper Christoph Hellwig
2019-06-26 12:27 ` [PATCH 08/25] memremap: validate the pagemap type passed to devm_memremap_pages Christoph Hellwig
2019-06-26 18:01   ` Ira Weiny
2019-06-26 12:27 ` [PATCH 09/25] memremap: move dev_pagemap callbacks into a separate structure Christoph Hellwig
2019-06-26 12:27 ` [PATCH 10/25] memremap: pass a struct dev_pagemap to ->kill and ->cleanup Christoph Hellwig
2019-06-26 12:27 ` [PATCH 11/25] memremap: lift the devmap_enable manipulation into devm_memremap_pages Christoph Hellwig
2019-06-26 19:04   ` Ira Weiny
2019-06-27  8:50     ` Christoph Hellwig
2019-06-26 12:27 ` [PATCH 12/25] memremap: add a migrate_to_ram method to struct dev_pagemap_ops Christoph Hellwig
2019-06-27 16:29   ` Jason Gunthorpe
2019-06-27 16:53     ` Christoph Hellwig
2019-06-26 12:27 ` [PATCH 13/25] memremap: remove the data field in struct dev_pagemap Christoph Hellwig
2019-06-26 12:27 ` [PATCH 14/25] memremap: replace the altmap_valid field with a PGMAP_ALTMAP_VALID flag Christoph Hellwig
2019-06-26 21:13   ` Ira Weiny
2019-06-26 12:27 ` [PATCH 15/25] memremap: provide an optional internal refcount in struct dev_pagemap Christoph Hellwig
2019-06-26 21:47   ` Ira Weiny
2019-06-27  8:51     ` Christoph Hellwig
2019-06-26 12:27 ` [PATCH 16/25] device-dax: use the dev_pagemap internal refcount Christoph Hellwig
2019-06-26 21:48   ` Ira Weiny [this message]
2019-06-28 15:38   ` Jason Gunthorpe
2019-06-28 16:27     ` Dan Williams
2019-06-28 17:02       ` Jason Gunthorpe
2019-06-28 17:08         ` Dan Williams
2019-06-28 17:10           ` Dan Williams
2019-06-28 18:29             ` Jason Gunthorpe
2019-06-28 18:44               ` Dan Williams
2019-06-28 18:51                 ` Christoph Hellwig
2019-06-28 18:59                   ` Dan Williams
2019-06-28 19:02                     ` Christoph Hellwig
2019-06-28 19:14                       ` Dan Williams
2019-07-02 22:35                         ` Andrew Morton
2019-06-26 12:27 ` [PATCH 17/25] PCI/P2PDMA: " Christoph Hellwig
2019-06-26 21:49   ` Ira Weiny
2019-06-27 18:49   ` Logan Gunthorpe
2019-06-26 12:27 ` [PATCH 18/25] nouveau: use alloc_page_vma directly Christoph Hellwig
2019-06-26 12:27 ` [PATCH 19/25] nouveau: use devm_memremap_pages directly Christoph Hellwig
2019-06-26 12:27 ` [PATCH 20/25] mm: remove hmm_vma_alloc_locked_page Christoph Hellwig
2019-06-27 16:26   ` Jason Gunthorpe
2019-06-26 12:27 ` [PATCH 21/25] mm: remove hmm_devmem_add Christoph Hellwig
2019-06-26 12:27 ` [PATCH 22/25] mm: simplify ZONE_DEVICE page private data Christoph Hellwig
2019-06-26 12:27 ` [PATCH 23/25] mm: sort out the DEVICE_PRIVATE Kconfig mess Christoph Hellwig
2019-06-26 21:36   ` Ira Weiny
2019-06-26 12:27 ` [PATCH 24/25] mm: remove the HMM config option Christoph Hellwig
2019-06-26 21:38   ` Ira Weiny
2019-06-27 16:29   ` Jason Gunthorpe
2019-06-26 12:27 ` [PATCH 25/25] mm: don't select MIGRATE_VMA_HELPER from HMM_MIRROR Christoph Hellwig

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