linux-kernel - Re: Merging libata PATA support into the base kernel

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Date:	Sun, 20 Aug 2006 20:44:03 -0400
From:	Lee Trager <Lee@...turesInMotion.net>
To:	Lee Trager <Lee@...turesInMotion.net>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, Pavel Machek <pavel@...e.cz>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Jason Lunz <lunz@...ooley.org>,
	Jens Axboe <axboe@...e.de>, Andi Kleen <ak@...e.de>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	Stefan Seyfried <seife@...e.de>
Subject: Re: Merging libata PATA support into the base kernel

Lee Trager wrote:
> Alan Cox wrote:
>   
>> Ar Gwe, 2006-08-18 am 15:22 -0400, ysgrifennodd Lee Trager:
>>   
>>     
>>> Well where in the kernel is the code that disabled HPA on startup? Im
>>> new to kernel hacking so if you could point me in the right direction I
>>> could try to patch it myself.
>>>     
>>>       
>> drivers/ide/ide-disk.c
>>
>> Particularly:
>> 	idedisk_check_hpa()
>>
>> which if you call at the end of the resume sequence for disks ought to
>> do the right thing for you
>>
>> -
>> To unsubscribe from this list: send the line "unsubscribe linux-ide" in
>> the body of a message to majordomo@...r.kernel.org
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>>
>>   
>>     
> Well I tried to do exactly what you said. All that happens now is that
> it does not come out of resume. Below is a patch of the code I tried to
> do in case you could like to look at it. Basically I called
> idedisk_check_hpa at the end of generic_ide_resume() in drivers/ide/ide.c
>
> diff -Naur linux-2.6.18-rc4-old/drivers/ide/ide-disk.c
> linux-2.6.18-rc4/drivers/ide/ide-disk.c
> --- linux-2.6.18-rc4-old/drivers/ide/ide-disk.c    2006-08-19
> 03:49:03.000000000 -0400
> +++ linux-2.6.18-rc4/drivers/ide/ide-disk.c    2006-08-19
> 03:41:33.000000000 -0400
> @@ -464,16 +464,6 @@
>  }
>  
>  /*
> - * Bits 10 of command_set_1 and cfs_enable_1 must be equal,
> - * so on non-buggy drives we need test only one.
> - * However, we should also check whether these fields are valid.
> - */
> -static inline int idedisk_supports_hpa(const struct hd_driveid *id)
> -{
> -    return (id->command_set_1 & 0x0400) && (id->cfs_enable_1 & 0x0400);
> -}
> -
> -/*
>   * The same here.
>   */
>  static inline int idedisk_supports_lba48(const struct hd_driveid *id)
> @@ -482,7 +472,7 @@
>             && id->lba_capacity_2;
>  }
>  
> -static void idedisk_check_hpa(ide_drive_t *drive)
> +void idedisk_check_hpa(ide_drive_t *drive)
>  {
>      unsigned long long capacity, set_max;
>      int lba48 = idedisk_supports_lba48(drive->id);
> @@ -514,6 +504,8 @@
>      }
>  }
>  
> +EXPORT_SYMBOL(idedisk_check_hpa);
> +
>  /*
>   * Compute drive->capacity, the full capacity of the drive
>   * Called with drive->id != NULL.
> diff -Naur linux-2.6.18-rc4-old/drivers/ide/ide.c
> linux-2.6.18-rc4/drivers/ide/ide.c
> --- linux-2.6.18-rc4-old/drivers/ide/ide.c    2006-08-19
> 03:49:03.000000000 -0400
> +++ linux-2.6.18-rc4/drivers/ide/ide.c    2006-08-19 03:41:33.000000000
> -0400
> @@ -1242,6 +1242,13 @@
>      rqpm.pm_step = ide_pm_state_start_resume;
>      rqpm.pm_state = PM_EVENT_ON;
>  
> +    /* check to see if this is a hard drive
> +     * if it is then checkhpa needs to be
> +     * disabled */
> +    if(drive->media == ide_disk)
> +        if(idedisk_supports_hpa(drive->id))
> +            idedisk_check_hpa(drive);
> +
>      return ide_do_drive_cmd(drive, &rq, ide_head_wait);
>  }
> diff -Naur linux-2.6.18-rc4-old/include/linux/ide.h
> linux-2.6.18-rc4/include/linux/ide.h
> --- linux-2.6.18-rc4-old/include/linux/ide.h    2006-08-19
> 03:49:03.000000000 -0400
> +++ linux-2.6.18-rc4/include/linux/ide.h    2006-08-19
> 03:42:53.000000000 -0400
> @@ -1377,4 +1377,16 @@
>      return dev ? pcibus_to_node(dev->bus) : -1;
>  }
>  
> +extern void idedisk_check_hpa(ide_drive_t *drive);
> +
> +/*
> + *  * Bits 10 of command_set_1 and cfs_enable_1 must be equal,
> + *   * so on non-buggy drives we need test only one.
> + *    * However, we should also check whether these fields are valid.
> + *     */
> +static inline int idedisk_supports_hpa(const struct hd_driveid *id)
> +{
> +        return (id->command_set_1 & 0x0400) && (id->cfs_enable_1 & 0x0400);
> +}
> +
>  #endif /* _IDE_H */
>
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-ide" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
>   
Ok I have it working now. The problem was that I had to call
ide_do_drive_cmd() first and then I had to call init_idedisk_capacity()
instead of idedisk_check_hpa(). Anyway im submitting the patch on the list.

Thanks,


Lee Trager
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