linux-kernel - Re: [PATCH next] iommu: intel: make DMAR_TABLE select IOMMU

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Date:   Tue, 13 Oct 2020 09:27:04 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>,
        David Woodhouse <dwmw2@...radead.org>,
        Joerg Roedel <joro@...tes.org>
Cc:     baolu.lu@...ux.intel.com, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH next] iommu: intel: make DMAR_TABLE select IOMMU_API

Hi,

On 10/12/20 8:31 PM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> 
> Since commit c40aaaac1018 ("iommu/vt-d: Gracefully handle DMAR units
> with no supported address widths") dmar.c needs struct iommu_device to
> be defined. We need to unconditionally select IOMMU_API when DMAR_TABLE
> is selected. This fixes the following build error when IOMMU_API is not
> selected:
> 
> drivers/iommu/intel/dmar.c: In function ‘free_iommu’:
> drivers/iommu/intel/dmar.c:1139:41: error: ‘struct iommu_device’ has no member named ‘ops’
>   1139 |  if (intel_iommu_enabled && iommu->iommu.ops) {

Thanks!

How about making it symmetric with the registration code?

	if (intel_iommu_enabled && !iommu->drhd->ignored)

Best regards,
baolu

>                                                  ^
> 
> Fixes: c40aaaac1018 ("iommu/vt-d: Gracefully handle DMAR units with no supported address widths")
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>   drivers/iommu/intel/Kconfig | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/intel/Kconfig b/drivers/iommu/intel/Kconfig
> index 5337ee1584b0..f814b7585ba8 100644
> --- a/drivers/iommu/intel/Kconfig
> +++ b/drivers/iommu/intel/Kconfig
> @@ -1,13 +1,13 @@
>   # SPDX-License-Identifier: GPL-2.0-only
>   # Intel IOMMU support
>   config DMAR_TABLE
> +	select IOMMU_API
>   	bool
>   
>   config INTEL_IOMMU
>   	bool "Support for Intel IOMMU using DMA Remapping Devices"
>   	depends on PCI_MSI && ACPI && (X86 || IA64)
>   	select DMA_OPS
> -	select IOMMU_API
>   	select IOMMU_IOVA
>   	select NEED_DMA_MAP_STATE
>   	select DMAR_TABLE
>