linux-kernel - Re: [PATCH] habanalabs: Use 'dma_set_mask_and

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Date:   Tue, 5 Jan 2021 17:39:54 +0200
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Oded Gabbay <ogabbay@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ofir Bitton <obitton@...ana.ai>,
        Lee Jones <lee.jones@...aro.org>,
        Tomer Tayar <ttayar@...ana.ai>,
        farah kassabri <fkassabri@...ana.ai>,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] habanalabs: Use 'dma_set_mask_and_coherent()' instead of
 hand-writing it

On Tue, Dec 29, 2020 at 1:17 PM Christophe JAILLET
<christophe.jaillet@...adoo.fr> wrote:
>
> Axe 'hl_pci_set_dma_mask()' and replace it with an equivalent
> 'dma_set_mask_and_coherent()' call.
>
> This makes the code a bit less verbose.
>
> It also removes an erroneous comment, because 'hl_pci_set_dma_mask()' does
> not try to use a fall-back value.
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>  drivers/misc/habanalabs/common/pci.c | 42 ++++------------------------
>  1 file changed, 6 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/misc/habanalabs/common/pci.c b/drivers/misc/habanalabs/common/pci.c
> index 923b2606e29f..eb8a784ba863 100644
> --- a/drivers/misc/habanalabs/common/pci.c
> +++ b/drivers/misc/habanalabs/common/pci.c
> @@ -301,40 +301,6 @@ int hl_pci_set_outbound_region(struct hl_device *hdev,
>         return rc;
>  }
>
> -/**
> - * hl_pci_set_dma_mask() - Set DMA masks for the device.
> - * @hdev: Pointer to hl_device structure.
> - *
> - * This function sets the DMA masks (regular and consistent) for a specified
> - * value. If it doesn't succeed, it tries to set it to a fall-back value
> - *
> - * Return: 0 on success, non-zero for failure.
> - */
> -static int hl_pci_set_dma_mask(struct hl_device *hdev)
> -{
> -       struct pci_dev *pdev = hdev->pdev;
> -       int rc;
> -
> -       /* set DMA mask */
> -       rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(hdev->dma_mask));
> -       if (rc) {
> -               dev_err(hdev->dev,
> -                       "Failed to set pci dma mask to %d bits, error %d\n",
> -                       hdev->dma_mask, rc);
> -               return rc;
> -       }
> -
> -       rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(hdev->dma_mask));
> -       if (rc) {
> -               dev_err(hdev->dev,
> -                       "Failed to set pci consistent dma mask to %d bits, error %d\n",
> -                       hdev->dma_mask, rc);
> -               return rc;
> -       }
> -
> -       return 0;
> -}
> -
>  /**
>   * hl_pci_init() - PCI initialization code.
>   * @hdev: Pointer to hl_device structure.
> @@ -371,9 +337,13 @@ int hl_pci_init(struct hl_device *hdev)
>                 goto unmap_pci_bars;
>         }
>
> -       rc = hl_pci_set_dma_mask(hdev);
> -       if (rc)
> +       rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(hdev->dma_mask));
> +       if (rc) {
> +               dev_err(hdev->dev,
> +                       "Failed to set dma mask to %d bits, error %d\n",
> +                       hdev->dma_mask, rc);
>                 goto unmap_pci_bars;
> +       }
>
>         return 0;
>
> --
> 2.27.0
>

Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Applied to -next
Oded