linux-kernel - Re: [PATCH v2 5/6] sparc64: Enable sun4v dma ops to use IOMMU v2 APIs

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Date:   Thu, 27 Oct 2016 17:41:27 -0700
From:   Joe Perches <joe@...ches.com>
To:     Tushar Dave <tushar.n.dave@...cle.com>, davem@...emloft.net,
        chris.hyser@...cle.com, sowmini.varadhan@...cle.com,
        vgupta@...opsys.com, jroedel@...e.de, egtvedt@...fundet.no,
        robin.murphy@....com, m.szyprowski@...sung.com, krzk@...nel.org,
        sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/6] sparc64: Enable sun4v dma ops to use IOMMU v2
 APIs

On Thu, 2016-10-27 at 17:23 -0700, Tushar Dave wrote:
> Add Hypervisor IOMMU v2 APIs pci_iotsb_map(), pci_iotsb_demap() and
> enable sun4v dma ops to use IOMMU v2 API for all PCIe devices with
> 64bit DMA mask.

trivia:

> diff --git a/arch/sparc/kernel/pci_sun4v.c b/arch/sparc/kernel/pci_sun4v.c
[]
> @@ -72,34 +72,55 @@ static inline void iommu_batch_start(struct device *dev, unsigned long prot, uns
>  }
>  
>  /* Interrupts must be disabled.  */
> -static long iommu_batch_flush(struct iommu_batch *p)
> +static long iommu_batch_flush(struct iommu_batch *p, u64 mask)
>  {
> 
[]
> +			if (unlikely(num < 0)) {
> +				pr_err_ratelimited("iommu_batch_flush: IOMMU map of [%08lx:%08llx:%lx:%lx:%lx] failed with status %ld\n",
> +						   devhandle,
> +						   HV_PCI_TSBID(0, entry),
> +						   npages, prot, __pa(pglist),
> +						   num);
> +				return -1;
> +			}
> +		} else {
> +			index_count = HV_PCI_IOTSB_INDEX_COUNT(npages, entry),
> +			iotsb_num = pbm->iommu->atu->iotsb->iotsb_num;
> +			ret = pci_sun4v_iotsb_map(devhandle,
> +						  iotsb_num,
> +						  index_count,
> +						  prot,
> +						  __pa(pglist),
> +						  &num);
> +			if (unlikely(ret != HV_EOK)) {
> +				pr_err_ratelimited("iommu_batch_flush: ATU map of [%08lx:%lx:%llx:%lx:%lx] failed with status %ld\n",
> +						   devhandle, iotsb_num,
> +						   index_count, prot,
> +						   __pa(pglist), ret);

Here and above, it's nicer to use %s, __func__ instead of
embedding the function name in the format in case the
code is ever refactored.

				pr_err_ratelimited("%s: ATU map of [%08lx:%lx:%llx:%lx:%lx] failed with status %ld\n",
						   __func__,
						   devhandle, iotsb_num,
						   index_count, prot,
						   __pa(pglist), ret);