Re: [PATCH v8 02/13] iommu/amd: add several helper functions

[Joerg Roedel <jroedel@suse.de>]

On Fri, Jul 21, 2017 at 04:59:00PM +0800, Baoquan He wrote:
> Move single iommu enabling codes into a wrapper function early_enable_iommu().
> This can make later kdump change easier.
> 
> And also add iommu_disable_command_buffer and iommu_disable_event_buffer
> for later usage.
> 
> Signed-off-by: Baoquan He <bhe@redhat.com>
> ---
>  drivers/iommu/amd_iommu_init.c | 42 +++++++++++++++++++++++++++++++-----------
>  1 file changed, 31 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
> index e39857ce6481..4ca6e3257d92 100644
> --- a/drivers/iommu/amd_iommu_init.c
> +++ b/drivers/iommu/amd_iommu_init.c
> @@ -634,6 +634,14 @@ static void iommu_enable_command_buffer(struct amd_iommu *iommu)
>  	amd_iommu_reset_cmd_buffer(iommu);
>  }
>  
> +/*
> + * This function disables the command buffer
> + */
> +static void iommu_disable_command_buffer(struct amd_iommu *iommu)
> +{
> +	iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
> +}
> +
>  static void __init free_command_buffer(struct amd_iommu *iommu)
>  {
>  	free_pages((unsigned long)iommu->cmd_buf, get_order(CMD_BUFFER_SIZE));
> @@ -666,6 +674,14 @@ static void iommu_enable_event_buffer(struct amd_iommu *iommu)
>  	iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN);
>  }
>  
> +/*
> + * This function disables the command buffer

s/command buffer/event log/

> + */
> +static void iommu_disable_event_buffer(struct amd_iommu *iommu)

Please also use event_log here.

> +{
> +	iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN);
> +}
> +