linux-kernel - Re: [PATCH 1/3] Make the IDE DMA timeout modifiable

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Date:	Wed, 21 Feb 2007 02:44:53 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Suleiman Souhlal <ssouhlal@...ebsd.org>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] Make the IDE DMA timeout modifiable


On Wednesday 21 February 2007 02:19, Suleiman Souhlal wrote:
> It can be changed via /proc/ide/hd?/settings.

Why do we need to change IDE DMA timeout dynamically?

BTW /proc/ide/hd?/settings is obsoleted

> Signed-off-by:	Ed Falk <efalk@...gle.com>
> 
> ---
>  drivers/ide/ide-dma.c |    3 ++-
>  drivers/ide/ide.c     |    2 ++
>  include/linux/ide.h   |    3 +++
>  3 files changed, 7 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
> index 08e7cd0..a8da725 100644
> --- a/drivers/ide/ide-dma.c
> +++ b/drivers/ide/ide-dma.c
> @@ -579,7 +579,8 @@ EXPORT_SYMBOL_GPL(ide_dma_setup);
>  static void ide_dma_exec_cmd(ide_drive_t *drive, u8 command)
>  {
>  	/* issue cmd to drive */
> -	ide_execute_command(drive, command, &ide_dma_intr, 2*WAIT_CMD, dma_timer_expiry);
> +	ide_execute_command(drive, command, &ide_dma_intr, drive->dma_timeout,
> +	    dma_timer_expiry);
>  }
>  
>  void ide_dma_start(ide_drive_t *drive)
> diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
> index b3c0818..ca841f2 100644
> --- a/drivers/ide/ide.c
> +++ b/drivers/ide/ide.c
> @@ -245,6 +245,7 @@ static void init_hwif_data(ide_hwif_t *h
>  		drive->name[1]			= 'd';
>  		drive->name[2]			= 'a' + (index * MAX_DRIVES) + unit;
>  		drive->max_failures		= IDE_DEFAULT_MAX_FAILURES;
> +		drive->dma_timeout		= WAIT_DMA;
>  		drive->using_dma		= 0;
>  		drive->vdma			= 0;
>  		INIT_LIST_HEAD(&drive->list);
> @@ -1197,6 +1198,7 @@ void ide_add_generic_settings (ide_drive
>  	__ide_add_setting(drive,	"init_speed",		SETTING_RW,					-1,			-1,			TYPE_BYTE,	0,	70,				1,		1,		&drive->init_speed,		NULL,		0);
>  	__ide_add_setting(drive,	"current_speed",	SETTING_RW,					-1,			-1,			TYPE_BYTE,	0,	70,				1,		1,		&drive->current_speed,		set_xfer_rate,	0);
>  	__ide_add_setting(drive,	"number",		SETTING_RW,					-1,			-1,			TYPE_BYTE,	0,	3,				1,		1,		&drive->dn,			NULL,		0);
> +	__ide_add_setting(drive,	"dma_timeout",		SETTING_RW,					-1,			-1,			TYPE_INT,	0,	2000000000,			1,		1,		&drive->dma_timeout,		NULL,		0);
>  }
>  
>  /**
> diff --git a/include/linux/ide.h b/include/linux/ide.h
> index 79c0282..3861753 100644
> --- a/include/linux/ide.h
> +++ b/include/linux/ide.h
> @@ -183,6 +183,7 @@ #define WAIT_READY	(5*HZ)		/* 5sec - som
>  #define WAIT_PIDENTIFY	(10*HZ)	/* 10sec  - should be less than 3ms (?), if all ATAPI CD is closed at boot */
>  #define WAIT_WORSTCASE	(30*HZ)	/* 30sec  - worst case when spinning up */
>  #define WAIT_CMD	(10*HZ)	/* 10sec  - maximum wait for an IRQ to happen */
> +#define WAIT_DMA	(20*HZ)	/* 20sec  - maximum wait for an IRQ to happen */
>  #define WAIT_MIN_SLEEP	(2*HZ/100)	/* 20msec - minimum sleep time */
>  
>  /*
> @@ -638,6 +639,8 @@ typedef struct ide_drive_s {
>  	unsigned int	drive_data;	/* use by tuneproc/selectproc */
>  	unsigned int	failures;	/* current failure count */
>  	unsigned int	max_failures;	/* maximum allowed failure count */
> +	int		dma_timeout;	/* number of jiffies to wait for a
> +					  dma to complete */
>  	u64		probed_capacity;/* initial reported media capacity (ide-cd only currently) */
>  
>  	u64		capacity64;	/* total number of sectors */
> 
> 
-
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