linux-kernel - Re: [PATCH v4 5/5] iommu/vt-d: Add debugfs support for Interrupt remapping

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Date:   Tue, 19 Dec 2017 23:30:20 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Sohil Mehta <sohil.mehta@...el.com>,
        Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Ashok Raj <ashok.raj@...el.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Gayatri Kammela <gayatri.kammela@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Fenghua Yu <fenghua.yu@...el.com>
Subject: Re: [PATCH v4 5/5] iommu/vt-d: Add debugfs support for Interrupt
 remapping

On Tue, 2017-12-19 at 13:08 -0800, Sohil Mehta wrote:
> Debugfs extension for Intel IOMMU to dump Interrupt remapping table
> entries for Interrupt remapping and Interrupt posting.
> 
> The file /sys/kernel/debug/intel_iommu/ir_translation_struct provides
> detailed information, such as Index, Source Id, Destination Id, Vector
> and the raw values for entries with the present bit set, in the format
> shown.
> 
> Remapped Interrupt supported on IOMMU: dmar5
>  IR table address:ffff93e09d54c310
> -----------------------------------------------------------
>  Index  SID  Dest_ID  Vct Raw_value_high   Raw_value_low
>  1      3a00 00000600 2c  0000000000043a00 00000600002c0009
>  111    4301 00000900 a2  0000000000044301 0000090000a20009
> 
> Posted Interrupt supported on IOMMU: dmar5
>  IR table address:ffff93e09d54c310
> --------------------------------------------------------------------
>  Index  SID  PDA_high PDA_low  Vct Raw_value_high   Raw_value_low
>  4      4300 00000010 40c7c880 41  0000001000044300 40c7c88000418001
>  5      4300 00000010 40c7c880 51  0000001000044300 40c7c88000518001
> 
> 

> +		seq_printf(m, "\nRemapped Interrupt supported on
> IOMMU: %s\n"

Please, avoid leading \n.

> +			   " IR table address:%p\n", iommu->name,
> +			   iommu->ir_table);
> +
> +		seq_puts(m, "--------------------------------------
> ---------"
> +			 "------------\n");

It's okay to use long string literal on one line. So, don't split (or
for multi-line string literals, split by \n like you do above).

> +	seq_puts(m,
> "\n****\t****\t****\t****\t****\t****\t****\t****\n");

Leading \n.

> +		seq_printf(m, "\nPosted Interrupt supported on IOMMU:
> %s\n"

Ditto.

> +			   " IR table address:%p\n", iommu->name,
> +			   iommu->ir_table);
> +
> +		seq_puts(m, "--------------------------------------
> ----------"
> +			 "--------------------\n");

Join back.

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy