Re: [PATCH -v3] ibft: Fix finding IBFT ACPI table on UEFI

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Thu, Dec 08, 2011 at 01:17:41PM -0800, Yinghai Lu wrote:
> 
> Found one system with UEFI/iBFT, kernel does not detect the iBFT during
> iscsi_ibft module loading.
> 
> Root cause: on x86 (UEFI), we are calling of find_ibft_region() much earlier
> 	- specifically in setup_arch() before ACPI is enabled.


I get this when compiling with make allmodconfig:

 BUILD   arch/x86/boot/bzImage
Setup is 16636 bytes (padded to 16896 bytes).
System is 4680 kB
CRC 88f70464
Kernel: arch/x86/boot/bzImage is ready  (#2)
ERROR: "acpi_table_parse" [drivers/firmware/iscsi_ibft.ko] undefined!
make[3]: *** [__modpost] Error 1
make[2]: *** [modules] Error 2


on 64-bit Fedora Core 16.

> 
> Try to split acpi checking code out and call that later
> 
> At that time ACPI iBFT already get permanent mapped with ioremap.
> So isa_virt_to_bus() will get wrong phys from right virt address.
> We could just skip that phys address printing.
> 
> For legacy one, print the found address early.
> 
> -v2: update comments and description according to Konrad.
> -v3: fix problem about module use case that is found by Konrad.
> 
> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
> 
> ---
>  drivers/firmware/iscsi_ibft.c      |   43 +++++++++++++++++++++++++++++++++++--
>  drivers/firmware/iscsi_ibft_find.c |   26 +---------------------
>  2 files changed, 43 insertions(+), 26 deletions(-)
> 
> Index: linux-2.6/drivers/firmware/iscsi_ibft.c
> ===================================================================
> --- linux-2.6.orig/drivers/firmware/iscsi_ibft.c
> +++ linux-2.6/drivers/firmware/iscsi_ibft.c
> @@ -746,6 +746,38 @@ static void __exit ibft_exit(void)
>  	ibft_cleanup();
>  }
>  
> +#ifdef CONFIG_ACPI
> +static const struct {
> +	char *sign;
> +} ibft_signs[] = {
> +	/*
> +	 * One spec says "IBFT", the other says "iBFT". We have to check
> +	 * for both.
> +	 */
> +	{ ACPI_SIG_IBFT },
> +	{ "iBFT" },
> +};
> +
> +static int __init acpi_find_ibft(struct acpi_table_header *header)
> +{
> +	ibft_addr = (struct acpi_table_ibft *)header;
> +
> +	return 0;
> +}
> +
> +static void __init acpi_find_ibft_region(void)
> +{
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++)
> +		acpi_table_parse(ibft_signs[i].sign, acpi_find_ibft);
> +}
> +#else
> +static void __init acpi_find_ibft_region(void)
> +{
> +}
> +#endif
> +
>  /*
>   * ibft_init() - creates sysfs tree entries for the iBFT data.
>   */
> @@ -753,9 +785,16 @@ static int __init ibft_init(void)
>  {
>  	int rc = 0;
>  
> +	/*
> +	   As on UEFI systems the setup_arch()/find_ibft_region()
> +	   is called before ACPI tables are parsed and it only does
> +	   legacy finding.
> +	*/
> +	if (!ibft_addr)
> +		acpi_find_ibft_region();
> +
>  	if (ibft_addr) {
> -		printk(KERN_INFO "iBFT detected at 0x%llx.\n",
> -		       (u64)isa_virt_to_bus(ibft_addr));
> +		pr_info("iBFT detected.\n");
>  
>  		rc = ibft_check_device();
>  		if (rc)
> Index: linux-2.6/drivers/firmware/iscsi_ibft_find.c
> ===================================================================
> --- linux-2.6.orig/drivers/firmware/iscsi_ibft_find.c
> +++ linux-2.6/drivers/firmware/iscsi_ibft_find.c
> @@ -45,13 +45,6 @@ EXPORT_SYMBOL_GPL(ibft_addr);
>  static const struct {
>  	char *sign;
>  } ibft_signs[] = {
> -#ifdef CONFIG_ACPI
> -	/*
> -	 * One spec says "IBFT", the other says "iBFT". We have to check
> -	 * for both.
> -	 */
> -	{ ACPI_SIG_IBFT },
> -#endif
>  	{ "iBFT" },
>  	{ "BIFT" },	/* Broadcom iSCSI Offload */
>  };
> @@ -62,14 +55,6 @@ static const struct {
>  #define VGA_MEM 0xA0000 /* VGA buffer */
>  #define VGA_SIZE 0x20000 /* 128kB */
>  
> -#ifdef CONFIG_ACPI
> -static int __init acpi_find_ibft(struct acpi_table_header *header)
> -{
> -	ibft_addr = (struct acpi_table_ibft *)header;
> -	return 0;
> -}
> -#endif /* CONFIG_ACPI */
> -
>  static int __init find_ibft_in_mem(void)
>  {
>  	unsigned long pos;
> @@ -94,6 +79,7 @@ static int __init find_ibft_in_mem(void)
>  				 * the table cannot be valid. */
>  				if (pos + len <= (IBFT_END-1)) {
>  					ibft_addr = (struct acpi_table_ibft *)virt;
> +					pr_info("iBFT found at 0x%lx.\n", pos);
>  					goto done;
>  				}
>  			}
> @@ -108,20 +94,12 @@ done:
>   */
>  unsigned long __init find_ibft_region(unsigned long *sizep)
>  {
> -#ifdef CONFIG_ACPI
> -	int i;
> -#endif
>  	ibft_addr = NULL;
>  
> -#ifdef CONFIG_ACPI
> -	for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++)
> -		acpi_table_parse(ibft_signs[i].sign, acpi_find_ibft);
> -#endif /* CONFIG_ACPI */
> -
>  	/* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will
>  	 * only use ACPI for this */
>  
> -	if (!ibft_addr && !efi_enabled)
> +	if (!efi_enabled)
>  		find_ibft_in_mem();
>  
>  	if (ibft_addr) {
> --
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