Re: [PATCH v2 03/17] misc/habana: Stop using frame_vector helpers

[John Hubbard <jhubbard@xxxxxxxxxx>]

On 10/9/20 12:59 AM, Daniel Vetter wrote:
> All we need are a pages array, pin_user_pages_fast can give us that
> directly. Plus this avoids the entire raw pfn side of get_vaddr_frames.
>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> Cc: Jason Gunthorpe <jgg@xxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: John Hubbard <jhubbard@xxxxxxxxxx>
> Cc: Jérôme Glisse <jglisse@xxxxxxxxxx>
> Cc: Jan Kara <jack@xxxxxxx>
> Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
> Cc: linux-mm@xxxxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-samsung-soc@xxxxxxxxxxxxxxx
> Cc: linux-media@xxxxxxxxxxxxxxx
> Cc: Oded Gabbay <oded.gabbay@xxxxxxxxx>
> Cc: Omer Shpigelman <oshpigelman@xxxxxxxxx>
> Cc: Ofir Bitton <obitton@xxxxxxxxx>
> Cc: Tomer Tayar <ttayar@xxxxxxxxx>
> Cc: Moti Haimovski <mhaimovski@xxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: Pawel Piskorski <ppiskorski@xxxxxxxxx>
> --
> v2: Use unpin_user_pages_dirty_lock (John)
> ---
>   drivers/misc/habanalabs/Kconfig             |  1 -
>   drivers/misc/habanalabs/common/habanalabs.h |  3 +-
>   drivers/misc/habanalabs/common/memory.c     | 49 ++++++++-------------
>   3 files changed, 20 insertions(+), 33 deletions(-)

Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx>

thanks,
--
John Hubbard
NVIDIA

> diff --git a/drivers/misc/habanalabs/Kconfig b/drivers/misc/habanalabs/Kconfig
> index 8eb5d38c618e..2f04187f7167 100644
> --- a/drivers/misc/habanalabs/Kconfig
> +++ b/drivers/misc/habanalabs/Kconfig
> @@ -6,7 +6,6 @@
>   config HABANA_AI
>   	tristate "HabanaAI accelerators (habanalabs)"
>   	depends on PCI && HAS_IOMEM
> -	select FRAME_VECTOR
>   	select DMA_SHARED_BUFFER
>   	select GENERIC_ALLOCATOR
>   	select HWMON
> diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h
> index edbd627b29d2..c1b3ad613b15 100644
> --- a/drivers/misc/habanalabs/common/habanalabs.h
> +++ b/drivers/misc/habanalabs/common/habanalabs.h
> @@ -881,7 +881,8 @@ struct hl_ctx_mgr {
>   struct hl_userptr {
>   	enum vm_type_t		vm_type; /* must be first */
>   	struct list_head	job_node;
> -	struct frame_vector	*vec;
> +	struct page		**pages;
> +	unsigned int		npages;
>   	struct sg_table		*sgt;
>   	enum dma_data_direction dir;
>   	struct list_head	debugfs_list;
> diff --git a/drivers/misc/habanalabs/common/memory.c b/drivers/misc/habanalabs/common/memory.c
> index 5ff4688683fd..327b64479f97 100644
> --- a/drivers/misc/habanalabs/common/memory.c
> +++ b/drivers/misc/habanalabs/common/memory.c
> @@ -1281,45 +1281,41 @@ static int get_user_memory(struct hl_device *hdev, u64 addr, u64 size,
>   		return -EFAULT;
>   	}
>   
> -	userptr->vec = frame_vector_create(npages);
> -	if (!userptr->vec) {
> +	userptr->pages = kvmalloc_array(npages, sizeof(*userptr->pages),
> +					GFP_KERNEL);
> +	if (!userptr->pages) {
>   		dev_err(hdev->dev, "Failed to create frame vector\n");
>   		return -ENOMEM;
>   	}
>   
> -	rc = get_vaddr_frames(start, npages, FOLL_FORCE | FOLL_WRITE,
> -				userptr->vec);
> +	rc = pin_user_pages_fast(start, npages, FOLL_FORCE | FOLL_WRITE,
> +				 userptr->pages);
>   
>   	if (rc != npages) {
>   		dev_err(hdev->dev,
>   			"Failed to map host memory, user ptr probably wrong\n");
>   		if (rc < 0)
> -			goto destroy_framevec;
> +			goto destroy_pages;
> +		npages = rc;
>   		rc = -EFAULT;
> -		goto put_framevec;
> -	}
> -
> -	if (frame_vector_to_pages(userptr->vec) < 0) {
> -		dev_err(hdev->dev,
> -			"Failed to translate frame vector to pages\n");
> -		rc = -EFAULT;
> -		goto put_framevec;
> +		goto put_pages;
>   	}
> +	userptr->npages = npages;
>   
>   	rc = sg_alloc_table_from_pages(userptr->sgt,
> -					frame_vector_pages(userptr->vec),
> -					npages, offset, size, GFP_ATOMIC);
> +				       userptr->pages,
> +				       npages, offset, size, GFP_ATOMIC);
>   	if (rc < 0) {
>   		dev_err(hdev->dev, "failed to create SG table from pages\n");
> -		goto put_framevec;
> +		goto put_pages;
>   	}
>   
>   	return 0;
>   
> -put_framevec:
> -	put_vaddr_frames(userptr->vec);
> -destroy_framevec:
> -	frame_vector_destroy(userptr->vec);
> +put_pages:
> +	unpin_user_pages(userptr->pages, npages);
> +destroy_pages:
> +	kvfree(userptr->pages);
>   	return rc;
>   }
>   
> @@ -1405,8 +1401,6 @@ int hl_pin_host_memory(struct hl_device *hdev, u64 addr, u64 size,
>    */
>   void hl_unpin_host_memory(struct hl_device *hdev, struct hl_userptr *userptr)
>   {
> -	struct page **pages;
> -
>   	hl_debugfs_remove_userptr(hdev, userptr);
>   
>   	if (userptr->dma_mapped)
> @@ -1414,15 +1408,8 @@ void hl_unpin_host_memory(struct hl_device *hdev, struct hl_userptr *userptr)
>   							userptr->sgt->nents,
>   							userptr->dir);
>   
> -	pages = frame_vector_pages(userptr->vec);
> -	if (!IS_ERR(pages)) {
> -		int i;
> -
> -		for (i = 0; i < frame_vector_count(userptr->vec); i++)
> -			set_page_dirty_lock(pages[i]);
> -	}
> -	put_vaddr_frames(userptr->vec);
> -	frame_vector_destroy(userptr->vec);
> +	unpin_user_pages_dirty_lock(userptr->pages, userptr->npages, true);
> +	kvfree(userptr->pages);
>   
>   	list_del(&userptr->job_node);
>   

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