Linux-PCI Archive on lore.kernel.org
 help / color / Atom feed
From: Logan Gunthorpe <logang@deltatee.com>
To: "Christoph Hellwig" <hch@lst.de>,
	"Dan Williams" <dan.j.williams@intel.com>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Jason Gunthorpe" <jgg@mellanox.com>,
	"Ben Skeggs" <bskeggs@redhat.com>
Cc: 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] PCI/P2PDMA: use the dev_pagemap internal refcount
Date: Mon, 17 Jun 2019 14:10:16 -0600
Message-ID: <e404fb0b-4ed8-34bb-7df8-9b59cb760f53@deltatee.com> (raw)
In-Reply-To: <20190617122733.22432-17-hch@lst.de>



On 2019-06-17 6:27 a.m., Christoph Hellwig wrote:
> The functionality is identical to the one currently open coded in
> p2pdma.c.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Logan Gunthorpe <logang@deltatee.com>

I also did a quick test with the full patch-set to ensure that the setup
and tear down paths for p2pdma still work correctly and it all does.

Thanks,

Logan

> ---
>  drivers/pci/p2pdma.c | 56 ++++----------------------------------------
>  1 file changed, 4 insertions(+), 52 deletions(-)
> 
> diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
> index 48a88158e46a..608f84df604a 100644
> --- a/drivers/pci/p2pdma.c
> +++ b/drivers/pci/p2pdma.c
> @@ -24,12 +24,6 @@ struct pci_p2pdma {
>  	bool p2pmem_published;
>  };
>  
> -struct p2pdma_pagemap {
> -	struct dev_pagemap pgmap;
> -	struct percpu_ref ref;
> -	struct completion ref_done;
> -};
> -
>  static ssize_t size_show(struct device *dev, struct device_attribute *attr,
>  			 char *buf)
>  {
> @@ -78,32 +72,6 @@ static const struct attribute_group p2pmem_group = {
>  	.name = "p2pmem",
>  };
>  
> -static struct p2pdma_pagemap *to_p2p_pgmap(struct percpu_ref *ref)
> -{
> -	return container_of(ref, struct p2pdma_pagemap, ref);
> -}
> -
> -static void pci_p2pdma_percpu_release(struct percpu_ref *ref)
> -{
> -	struct p2pdma_pagemap *p2p_pgmap = to_p2p_pgmap(ref);
> -
> -	complete(&p2p_pgmap->ref_done);
> -}
> -
> -static void pci_p2pdma_percpu_kill(struct dev_pagemap *pgmap)
> -{
> -	percpu_ref_kill(pgmap->ref);
> -}
> -
> -static void pci_p2pdma_percpu_cleanup(struct dev_pagemap *pgmap)
> -{
> -	struct p2pdma_pagemap *p2p_pgmap =
> -		container_of(pgmap, struct p2pdma_pagemap, pgmap);
> -
> -	wait_for_completion(&p2p_pgmap->ref_done);
> -	percpu_ref_exit(&p2p_pgmap->ref);
> -}
> -
>  static void pci_p2pdma_release(void *data)
>  {
>  	struct pci_dev *pdev = data;
> @@ -153,11 +121,6 @@ static int pci_p2pdma_setup(struct pci_dev *pdev)
>  	return error;
>  }
>  
> -static const struct dev_pagemap_ops pci_p2pdma_pagemap_ops = {
> -	.kill		= pci_p2pdma_percpu_kill,
> -	.cleanup	= pci_p2pdma_percpu_cleanup,
> -};
> -
>  /**
>   * pci_p2pdma_add_resource - add memory for use as p2p memory
>   * @pdev: the device to add the memory to
> @@ -171,7 +134,6 @@ static const struct dev_pagemap_ops pci_p2pdma_pagemap_ops = {
>  int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
>  			    u64 offset)
>  {
> -	struct p2pdma_pagemap *p2p_pgmap;
>  	struct dev_pagemap *pgmap;
>  	void *addr;
>  	int error;
> @@ -194,22 +156,12 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
>  			return error;
>  	}
>  
> -	p2p_pgmap = devm_kzalloc(&pdev->dev, sizeof(*p2p_pgmap), GFP_KERNEL);
> -	if (!p2p_pgmap)
> +	pgmap = devm_kzalloc(&pdev->dev, sizeof(*pgmap), GFP_KERNEL);
> +	if (!pgmap)
>  		return -ENOMEM;
> -
> -	init_completion(&p2p_pgmap->ref_done);
> -	error = percpu_ref_init(&p2p_pgmap->ref,
> -			pci_p2pdma_percpu_release, 0, GFP_KERNEL);
> -	if (error)
> -		goto pgmap_free;
> -
> -	pgmap = &p2p_pgmap->pgmap;
> -
>  	pgmap->res.start = pci_resource_start(pdev, bar) + offset;
>  	pgmap->res.end = pgmap->res.start + size - 1;
>  	pgmap->res.flags = pci_resource_flags(pdev, bar);
> -	pgmap->ref = &p2p_pgmap->ref;
>  	pgmap->type = MEMORY_DEVICE_PCI_P2PDMA;
>  	pgmap->pci_p2pdma_bus_offset = pci_bus_address(pdev, bar) -
>  		pci_resource_start(pdev, bar);
> @@ -223,7 +175,7 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
>  	error = gen_pool_add_owner(pdev->p2pdma->pool, (unsigned long)addr,
>  			pci_bus_address(pdev, bar) + offset,
>  			resource_size(&pgmap->res), dev_to_node(&pdev->dev),
> -			&p2p_pgmap->ref);
> +			pgmap->ref);
>  	if (error)
>  		goto pages_free;
>  
> @@ -235,7 +187,7 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
>  pages_free:
>  	devm_memunmap_pages(&pdev->dev, pgmap);
>  pgmap_free:
> -	devm_kfree(&pdev->dev, p2p_pgmap);
> +	devm_kfree(&pdev->dev, pgmap);
>  	return error;
>  }
>  EXPORT_SYMBOL_GPL(pci_p2pdma_add_resource);
> 

  reply index

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-17 12:27 dev_pagemap related cleanups v2 Christoph Hellwig
2019-06-17 12:27 ` [PATCH 01/25] mm: remove the unused ARCH_HAS_HMM_DEVICE Kconfig option Christoph Hellwig
2019-06-17 12:27 ` [PATCH 02/25] mm: remove the struct hmm_device infrastructure Christoph Hellwig
2019-06-17 12:27 ` [PATCH 03/25] mm: remove hmm_devmem_add_resource Christoph Hellwig
2019-06-17 12:27 ` [PATCH 04/25] mm: don't clear ->mapping in hmm_devmem_free Christoph Hellwig
2019-06-17 12:27 ` [PATCH 05/25] mm: export alloc_pages_vma Christoph Hellwig
2019-06-17 12:27 ` [PATCH 06/25] mm: factor out a devm_request_free_mem_region helper Christoph Hellwig
2019-06-17 17:37   ` Dan Williams
2019-06-17 17:40     ` Christoph Hellwig
2019-06-17 17:42       ` Christoph Hellwig
2019-06-17 12:27 ` [PATCH 07/25] memremap: validate the pagemap type passed to devm_memremap_pages Christoph Hellwig
2019-06-17 19:02   ` Dan Williams
2019-06-17 19:54     ` Christoph Hellwig
2019-06-17 20:36       ` Dan Williams
2019-06-17 12:27 ` [PATCH 08/25] memremap: move dev_pagemap callbacks into a separate structure Christoph Hellwig
2019-06-17 17:51   ` Dan Williams
2019-06-17 19:55     ` Christoph Hellwig
2019-06-17 21:09       ` Dan Williams
2019-06-17 20:08   ` Logan Gunthorpe
2019-06-17 20:09     ` Christoph Hellwig
2019-06-17 12:27 ` [PATCH 09/25] memremap: pass a struct dev_pagemap to ->kill and ->cleanup Christoph Hellwig
2019-06-17 12:27 ` [PATCH 10/25] memremap: lift the devmap_enable manipulation into devm_memremap_pages Christoph Hellwig
2019-06-17 19:25   ` Dan Williams
2019-06-17 12:27 ` [PATCH 11/25] memremap: add a migrate_to_ram method to struct dev_pagemap_ops Christoph Hellwig
2019-06-17 12:27 ` [PATCH 12/25] memremap: remove the data field in struct dev_pagemap Christoph Hellwig
2019-06-17 12:27 ` [PATCH 13/25] memremap: replace the altmap_valid field with a PGMAP_ALTMAP_VALID flag Christoph Hellwig
2019-06-17 12:27 ` [PATCH 14/25] memremap: provide an optional internal refcount in struct dev_pagemap Christoph Hellwig
2019-06-17 12:27 ` [PATCH 15/25] device-dax: use the dev_pagemap internal refcount Christoph Hellwig
2019-06-18 19:43   ` Dan Williams
2019-06-17 12:27 ` [PATCH 16/25] PCI/P2PDMA: " Christoph Hellwig
2019-06-17 20:10   ` Logan Gunthorpe [this message]
2019-06-17 12:27 ` [PATCH 17/25] nouveau: use alloc_page_vma directly Christoph Hellwig
2019-06-17 12:27 ` [PATCH 18/25] nouveau: use devm_memremap_pages directly Christoph Hellwig
2019-06-17 12:27 ` [PATCH 19/25] mm: remove hmm_vma_alloc_locked_page Christoph Hellwig
2019-06-17 12:27 ` [PATCH 20/25] mm: remove hmm_devmem_add Christoph Hellwig
2019-06-17 12:27 ` [PATCH 21/25] mm: mark DEVICE_PUBLIC as broken Christoph Hellwig
2019-06-17 12:27 ` [PATCH 22/25] mm: simplify ZONE_DEVICE page private data Christoph Hellwig
2019-06-17 12:27 ` [PATCH 23/25] mm: sort out the DEVICE_PRIVATE Kconfig mess Christoph Hellwig
2019-06-17 12:27 ` [PATCH 24/25] mm: remove the HMM config option Christoph Hellwig
2019-06-17 12:27 ` [PATCH 25/25] mm: don't select MIGRATE_VMA_HELPER from HMM_MIRROR Christoph Hellwig
2019-06-18 19:47 ` dev_pagemap related cleanups v2 Dan Williams
2019-06-19  9:40   ` Christoph Hellwig
2019-06-19 16:36     ` Jason Gunthorpe
2019-06-19 16:46       ` Dan Williams
2019-06-19 18:19         ` Jason Gunthorpe
2019-06-20  6:32           ` Christoph Hellwig

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=e404fb0b-4ed8-34bb-7df8-9b59cb760f53@deltatee.com \
    --to=logang@deltatee.com \
    --cc=bskeggs@redhat.com \
    --cc=dan.j.williams@intel.com \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=hch@lst.de \
    --cc=jgg@mellanox.com \
    --cc=jglisse@redhat.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=linux-nvdimm@lists.01.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=nouveau@lists.freedesktop.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-PCI Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-pci/0 linux-pci/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-pci linux-pci/ https://lore.kernel.org/linux-pci \
		linux-pci@vger.kernel.org linux-pci@archiver.kernel.org
	public-inbox-index linux-pci

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-pci


AGPL code for this site: git clone https://public-inbox.org/ public-inbox