Re: [PATCH v2 16/38] cxlflash: MMIO map the AFU

[Frederic Barrat <fbarrat@linux.vnet.ibm.com>]

Le 26/02/2018 à 23:22, Uma Krishnan a écrit :
> When the AFU is configured, the global and per process MMIO regions
> are presented by the configuration space. Save these regions and
> map the global MMIO region that is used to access all of the control
> and provisioning data in the AFU.
> 
> Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
> ---


Reviewed-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>


>   drivers/scsi/cxlflash/ocxl_hw.c | 74 ++++++++++++++++++++++++++++++++++++++++-
>   drivers/scsi/cxlflash/ocxl_hw.h |  4 +++
>   2 files changed, 77 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c
> index 7717a63..3917aa1 100644
> --- a/drivers/scsi/cxlflash/ocxl_hw.c
> +++ b/drivers/scsi/cxlflash/ocxl_hw.c
> @@ -264,6 +264,18 @@ static void ocxlflash_perst_reloads_same_image(void *afu_cookie, bool image)
>   }
> 
>   /**
> + * ocxlflash_unconfig_afu() - unconfigure the AFU
> + * @afu: AFU associated with the host.
> + */
> +static void ocxlflash_unconfig_afu(struct ocxl_hw_afu *afu)
> +{
> +	if (afu->gmmio_virt) {
> +		iounmap(afu->gmmio_virt);
> +		afu->gmmio_virt = NULL;
> +	}
> +}
> +
> +/**
>    * ocxlflash_destroy_afu() - destroy the AFU structure
>    * @afu_cookie:	AFU to be freed.
>    */
> @@ -276,6 +288,7 @@ static void ocxlflash_destroy_afu(void *afu_cookie)
> 
>   	ocxlflash_release_context(afu->ocxl_ctx);
>   	idr_destroy(&afu->idr);
> +	ocxlflash_unconfig_afu(afu);
>   	kfree(afu);
>   }
> 
> @@ -324,6 +337,56 @@ static int ocxlflash_config_fn(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
>   }
> 
>   /**
> + * ocxlflash_map_mmio() - map the AFU MMIO space
> + * @afu: AFU associated with the host.
> + *
> + * Return: 0 on success, -errno on failure
> + */
> +static int ocxlflash_map_mmio(struct ocxl_hw_afu *afu)
> +{
> +	struct ocxl_afu_config *acfg = &afu->acfg;
> +	struct pci_dev *pdev = afu->pdev;
> +	struct device *dev = afu->dev;
> +	phys_addr_t gmmio, ppmmio;
> +	int rc = 0;
> +
> +	rc = pci_request_region(pdev, acfg->global_mmio_bar, "ocxlflash");
> +	if (unlikely(rc)) {
> +		dev_err(dev, "%s: pci_request_region for global failed rc=%d\n",
> +			__func__, rc);
> +		goto out;
> +	}
> +	gmmio = pci_resource_start(pdev, acfg->global_mmio_bar);
> +	gmmio += acfg->global_mmio_offset;
> +
> +	rc = pci_request_region(pdev, acfg->pp_mmio_bar, "ocxlflash");
> +	if (unlikely(rc)) {
> +		dev_err(dev, "%s: pci_request_region for pp bar failed rc=%d\n",
> +			__func__, rc);
> +		goto err1;
> +	}
> +	ppmmio = pci_resource_start(pdev, acfg->pp_mmio_bar);
> +	ppmmio += acfg->pp_mmio_offset;
> +
> +	afu->gmmio_virt = ioremap(gmmio, acfg->global_mmio_size);
> +	if (unlikely(!afu->gmmio_virt)) {
> +		dev_err(dev, "%s: MMIO mapping failed\n", __func__);
> +		rc = -ENOMEM;
> +		goto err2;
> +	}
> +
> +	afu->gmmio_phys = gmmio;
> +	afu->ppmmio_phys = ppmmio;
> +out:
> +	return rc;
> +err2:
> +	pci_release_region(pdev, acfg->pp_mmio_bar);
> +err1:
> +	pci_release_region(pdev, acfg->global_mmio_bar);
> +	goto out;
> +}
> +
> +/**
>    * ocxlflash_config_afu() - configure the host AFU
>    * @pdev:	PCI device associated with the host.
>    * @afu:	AFU associated with the host.
> @@ -362,6 +425,13 @@ static int ocxlflash_config_afu(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
>   	afu->max_pasid = 1 << acfg->pasid_supported_log;
> 
>   	ocxl_config_set_afu_pasid(pdev, pos, 0, acfg->pasid_supported_log);
> +
> +	rc = ocxlflash_map_mmio(afu);
> +	if (unlikely(rc)) {
> +		dev_err(dev, "%s: ocxlflash_map_mmio failed rc=%d\n",
> +			__func__, rc);
> +		goto out;
> +	}
>   out:
>   	return rc;
>   }
> @@ -407,13 +477,15 @@ static void *ocxlflash_create_afu(struct pci_dev *pdev)
>   		rc = PTR_ERR(ctx);
>   		dev_err(dev, "%s: ocxlflash_dev_context_init failed rc=%d\n",
>   			__func__, rc);
> -		goto err1;
> +		goto err2;
>   	}
> 
>   	idr_init(&afu->idr);
>   	afu->ocxl_ctx = ctx;
>   out:
>   	return afu;
> +err2:
> +	ocxlflash_unconfig_afu(afu);
>   err1:
>   	kfree(afu);
>   	afu = NULL;
> diff --git a/drivers/scsi/cxlflash/ocxl_hw.h b/drivers/scsi/cxlflash/ocxl_hw.h
> index fd1a8df..29c75c4 100644
> --- a/drivers/scsi/cxlflash/ocxl_hw.h
> +++ b/drivers/scsi/cxlflash/ocxl_hw.h
> @@ -27,6 +27,10 @@ struct ocxl_hw_afu {
>   	int afu_actag_base;		/* AFU acTag base */
>   	int afu_actag_enabled;		/* AFU acTag number enabled */
> 
> +	phys_addr_t ppmmio_phys;	/* Per process MMIO space */
> +	phys_addr_t gmmio_phys;		/* Global AFU MMIO space */
> +	void __iomem *gmmio_virt;	/* Global MMIO map */
> +
>   	struct idr idr;			/* IDR to manage contexts */
>   	int max_pasid;			/* Maximum number of contexts */
>   };
>