linux-kernel - Re: Endless ACPI errors on Linus tree (5b664cb235)

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Date:	Fri, 18 Jul 2008 18:38:53 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	"Jan Beulich" <jbeulich@...ell.com>
Cc:	"Andi Kleen" <andi@...stfloor.org>, <robert.moore@...el.com>,
	"Len Brown" <lenb@...nel.org>,
	"LKML" <linux-kernel@...r.kernel.org>
Subject: Re: Endless ACPI errors on Linus tree (5b664cb235)

At Fri, 18 Jul 2008 17:16:53 +0100,
Jan Beulich wrote:
> 
> >OK, found out the bad commit via bisect.
> >Reverting below fixes the boot problem.
> >
> >
> >commit 01a5bba576b9364b33f61f0cd9fa70c2cf5535e2
> >Author: Jan Beulich <jbeulich@...ell.com>
> >Date:   Wed Jul 16 23:27:08 2008 +0200
> >
> >    Fix FADT parsing
>     
> After someone else observed some problem with this patch earlier, I had
> already sent out attached patch as a replacement one. Any chance you
> could also try this with your box?

It resulted in the same error, unfortunately.


thanks,

Takashi

> 
> Thanks, Jan
> 
> [2 linux-2.6.26-acpi-fadt-parse.patch <text/plain (quoted-printable)>]
> The (1.0 inherited) separate length fields in the FADT are byte
> granular. Further, PM1a/b may have distinct lengths and live in
> distinct address spaces. acpi_tb_convert_fadt() should account for
> all of these conditions.
> 
> Signed-off-by: Jan Beulich <jbeulich@...ell.com>
> 
> ---
>  drivers/acpi/tables/tbfadt.c |   39 ++++++++++++++++++++++++++++++++-------
>  1 file changed, 32 insertions(+), 7 deletions(-)
> 
> --- linux-2.6.26/drivers/acpi/tables/tbfadt.c	2008-07-13 23:51:29.000000000 +0200
> +++ 2.6.26-acpi-fadt-parse/drivers/acpi/tables/tbfadt.c	2008-07-18 10:43:55.000000000 +0200
> @@ -50,7 +50,7 @@ ACPI_MODULE_NAME("tbfadt")
>  /* Local prototypes */
>  static void inline
>  acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
> -			     u8 bit_width, u64 address);
> +			     u8 byte_width, u64 address);
>  
>  static void acpi_tb_convert_fadt(void);
>  
> @@ -111,7 +111,7 @@ static struct acpi_fadt_info fadt_info_t
>   * FUNCTION:    acpi_tb_init_generic_address
>   *
>   * PARAMETERS:  generic_address     - GAS struct to be initialized
> - *              bit_width           - Width of this register
> + *              byte_width          - Width of this register
>   *              Address             - Address of the register
>   *
>   * RETURN:      None
> @@ -124,7 +124,7 @@ static struct acpi_fadt_info fadt_info_t
>  
>  static void inline
>  acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
> -			     u8 bit_width, u64 address)
> +			     u8 byte_width, u64 address)
>  {
>  
>  	/*
> @@ -136,7 +136,7 @@ acpi_tb_init_generic_address(struct acpi
>  	/* All other fields are byte-wide */
>  
>  	generic_address->space_id = ACPI_ADR_SPACE_SYSTEM_IO;
> -	generic_address->bit_width = bit_width;
> +	generic_address->bit_width = byte_width << 3;
>  	generic_address->bit_offset = 0;
>  	generic_address->access_width = 0;
>  }
> @@ -343,9 +343,21 @@ static void acpi_tb_convert_fadt(void)
>  	 *
>  	 * The PM event blocks are split into two register blocks, first is the
>  	 * PM Status Register block, followed immediately by the PM Enable Register
> -	 * block. Each is of length (pm1_event_length/2)
> +	 * block. Each is of length (xpm1x_event_block.bit_width/2)
>  	 */
> -	pm1_register_length = (u8) ACPI_DIV_2(acpi_gbl_FADT.pm1_event_length);
> +	if (!ACPI_MOD_16(acpi_gbl_FADT.xpm1a_event_block.bit_width))
> +		pm1_register_length = (u8) ACPI_DIV_16(acpi_gbl_FADT
> +						       .xpm1a_event_block
> +						       .bit_width);
> +	else {
> +		printk(KERN_WARNING "FADT: "
> +		       "X_PM1a_EVT_BLK.bit_width=%u is invalid,"
> +		       " falling back to PM1_EVT_LEN=%u\n",
> +		       acpi_gbl_FADT.xpm1a_event_block.bit_width,
> +		       acpi_gbl_FADT.pm1_event_length);
> +		pm1_register_length = (u8) ACPI_DIV_2(acpi_gbl_FADT
> +						      .pm1_event_length);
> +	}
>  
>  	/* The PM1A register block is required */
>  
> @@ -360,13 +372,26 @@ static void acpi_tb_convert_fadt(void)
>  	/* The PM1B register block is optional, ignore if not present */
>  
>  	if (acpi_gbl_FADT.xpm1b_event_block.address) {
> +		if (!ACPI_MOD_16(acpi_gbl_FADT.xpm1b_event_block.bit_width))
> +			pm1_register_length = (u8) ACPI_DIV_16(acpi_gbl_FADT
> +							       .xpm1b_event_block
> +							       .bit_width);
> +		else {
> +			printk(KERN_WARNING "FADT: "
> +			       "X_PM1b_EVT_BLK.bit_width=%u is invalid,"
> +			       " falling back to PM1_EVT_LEN=%u\n",
> +			       acpi_gbl_FADT.xpm1b_event_block.bit_width,
> +			       acpi_gbl_FADT.pm1_event_length);
> +			pm1_register_length = (u8) ACPI_DIV_2(acpi_gbl_FADT
> +							       .pm1_event_length);
> +		}
>  		acpi_tb_init_generic_address(&acpi_gbl_xpm1b_enable,
>  					     pm1_register_length,
>  					     (acpi_gbl_FADT.xpm1b_event_block.
>  					      address + pm1_register_length));
>  		/* Don't forget to copy space_id of the GAS */
>  		acpi_gbl_xpm1b_enable.space_id =
> -		    acpi_gbl_FADT.xpm1a_event_block.space_id;
> +		    acpi_gbl_FADT.xpm1b_event_block.space_id;
>  
>  	}
>  }
--
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