On Sun, Jul 13, 2014 at 5:54 PM, Akinobu Mita <akinobu.mita@xxxxxxxxx> wrote:
> If the controller doesn't support 64-bit addressing mode, it must not
> set the DMA mask to 64-bit. But it's unconditionally trying to set to
> 64-bit without checking 64-bit addressing support in the controller
> capabilities.
>
> It was correctly checked before commit 3b1d05807a9a68c6d0580e9248247a774a4d3be6
> ("[SCSI] ufs: Segregate PCI Specific Code"), this aims to restores
> the correct behaviour.
>
> To achieve this in a generic way, firstly we should push down the DMA
> mask setting routine ufshcd_set_dma_mask() from PCI glue driver to core
> driver in order to do it for both PCI glue driver and Platform glue
> driver. Secondly, we should change pci_ DMA mapping API to dma_ DMA
> mapping API because core driver is independent of glue drivers.
>
> Signed-off-by: Akinobu Mita <mita@xxxxxxxxxxxx>
> Cc: Sujit Reddy Thumma <sthumma@xxxxxxxxxxxxxx>
> Cc: Vinayak Holikatti <vinholikatti@xxxxxxxxx>
> Cc: Santosh Y <santoshsy@xxxxxxxxx>
> Cc: "James E.J. Bottomley" <JBottomley@xxxxxxxxxxxxx>
> Cc: linux-scsi@xxxxxxxxxxxxxxx
> ---
> * Change from v1
> - use dma_set_mask_and_coherent() suggested by Santosh Y
>
> drivers/scsi/ufs/ufshcd-pci.c | 26 --------------------------
> drivers/scsi/ufs/ufshcd.c | 22 ++++++++++++++++++++++
> 2 files changed, 22 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufshcd-pci.c b/drivers/scsi/ufs/ufshcd-pci.c
> index 8b95312..c007a7a 100644
> --- a/drivers/scsi/ufs/ufshcd-pci.c
> +++ b/drivers/scsi/ufs/ufshcd-pci.c
> @@ -135,26 +135,6 @@ static void ufshcd_pci_remove(struct pci_dev *pdev)
> }
>
> /**
> - * ufshcd_set_dma_mask - Set dma mask based on the controller
> - * addressing capability
> - * @pdev: PCI device structure
> - *
> - * Returns 0 for success, non-zero for failure
> - */
> -static int ufshcd_set_dma_mask(struct pci_dev *pdev)
> -{
> - int err;
> -
> - if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))
> - && !pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)))
> - return 0;
> - err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
> - if (!err)
> - err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
> - return err;
> -}
> -
> -/**
> * ufshcd_pci_probe - probe routine of the driver
> * @pdev: pointer to PCI device handle
> * @id: PCI device id
> @@ -184,12 +164,6 @@ ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>
> mmio_base = pcim_iomap_table(pdev)[0];
>
> - err = ufshcd_set_dma_mask(pdev);
> - if (err) {
> - dev_err(&pdev->dev, "set dma mask failed\n");
> - return err;
> - }
> -
> err = ufshcd_init(&pdev->dev, &hba, mmio_base, pdev->irq);
> if (err) {
> dev_err(&pdev->dev, "Initialization failed\n");
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 0c28772..545dae4 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -3110,6 +3110,22 @@ void ufshcd_remove(struct ufs_hba *hba)
> EXPORT_SYMBOL_GPL(ufshcd_remove);
>
> /**
> + * ufshcd_set_dma_mask - Set dma mask based on the controller
> + * addressing capability
> + * @hba: per adapter instance
> + *
> + * Returns 0 for success, non-zero for failure
> + */
> +static int ufshcd_set_dma_mask(struct ufs_hba *hba)
> +{
> + if (hba->capabilities & MASK_64_ADDRESSING_SUPPORT) {
> + if (!dma_set_mask_and_coherent(hba->dev, DMA_BIT_MASK(64)))
> + return 0;
> + }
> + return dma_set_mask_and_coherent(hba->dev, DMA_BIT_MASK(32));
> +}
> +
> +/**
> * ufshcd_init - Driver initialization routine
> * @dev: pointer to device handle
> * @hba_handle: driver private handle
> @@ -3160,6 +3176,12 @@ int ufshcd_init(struct device *dev, struct ufs_hba **hba_handle,
> /* Get Interrupt bit mask per version */
> hba->intr_mask = ufshcd_get_intr_mask(hba);
>
> + err = ufshcd_set_dma_mask(hba);
> + if (err) {
> + dev_err(hba->dev, "set dma mask failed\n");
> + goto out_disable;
> + }
> +
> /* Allocate memory for host memory space */
> err = ufshcd_memory_alloc(hba);
> if (err) {
> --
> 1.9.1
>
Acked-by: Santosh Y <santoshsy@xxxxxxxxx>
--
~Santosh
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