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Date: Wed, 27 Nov 2013 15:37:14 +0000
From: Grant Likely <grant.likely@...retlab.ca>
To: Ard Biesheuvel <ard.biesheuvel@...aro.org>, x86@...nel.org,
linux-ia64@...r.kernel.org, mingo@...hat.com, tony.luck@...el.com,
linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Cc: leif.lindholm@...aro.org, al.stone@...aro.org, yi.li@...aro.org,
Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: [PATCH v2] firmware/dmi_scan: generalize for use by other archs
On Wed, 27 Nov 2013 15:08:47 +0100, Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
> This patch makes a couple of changes to the SMBIOS/DMI scanning
> code so it can be used on other archs (such as ARM and arm64):
> (a) wrap the calls to ioremap()/iounmap(), this allows the use of a
> flavor of ioremap() more suitable for random unaligned access;
> (b) allow the non-EFI fallback probe into hardcoded physical address
> 0xF0000 to be disabled.
>
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Acked-by: Grant Likely <grant.likely@...aro.org>
> ---
>
> Changes since v1:
> - followed Grant's suggestion to use a Kconfig symbol in conjunction with
> IS_ENABLED() rather than a plain #ifdef to en-/disable the dmi scan fallback
>
> arch/ia64/Kconfig | 1 +
> arch/ia64/include/asm/dmi.h | 8 +++++---
> arch/x86/Kconfig | 1 +
> arch/x86/include/asm/dmi.h | 6 ++++--
> drivers/firmware/Kconfig | 3 +++
> drivers/firmware/dmi_scan.c | 20 ++++++++++----------
> 6 files changed, 24 insertions(+), 15 deletions(-)
>
> diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
> index 4e4119b..bdb4aed 100644
> --- a/arch/ia64/Kconfig
> +++ b/arch/ia64/Kconfig
> @@ -104,6 +104,7 @@ config HAVE_SETUP_PER_CPU_AREA
> config DMI
> bool
> default y
> + select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
>
> config EFI
> bool
> diff --git a/arch/ia64/include/asm/dmi.h b/arch/ia64/include/asm/dmi.h
> index 185d3d1..f365a61 100644
> --- a/arch/ia64/include/asm/dmi.h
> +++ b/arch/ia64/include/asm/dmi.h
> @@ -5,8 +5,10 @@
> #include <asm/io.h>
>
> /* Use normal IO mappings for DMI */
> -#define dmi_ioremap ioremap
> -#define dmi_iounmap(x,l) iounmap(x)
> -#define dmi_alloc(l) kzalloc(l, GFP_ATOMIC)
> +#define dmi_early_remap ioremap
> +#define dmi_early_unmap(x, l) iounmap(x)
> +#define dmi_remap ioremap
> +#define dmi_unmap iounmap
> +#define dmi_alloc(l) kzalloc(l, GFP_ATOMIC)
>
> #endif
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index e903c71..6350ab4 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -745,6 +745,7 @@ config APB_TIMER
> # The code disables itself when not needed.
> config DMI
> default y
> + select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
> bool "Enable DMI scanning" if EXPERT
> ---help---
> Enabled scanning of DMI to identify machine quirks. Say Y
> diff --git a/arch/x86/include/asm/dmi.h b/arch/x86/include/asm/dmi.h
> index fd8f9e2..535192f 100644
> --- a/arch/x86/include/asm/dmi.h
> +++ b/arch/x86/include/asm/dmi.h
> @@ -13,7 +13,9 @@ static __always_inline __init void *dmi_alloc(unsigned len)
> }
>
> /* Use early IO mappings for DMI because it's initialized early */
> -#define dmi_ioremap early_ioremap
> -#define dmi_iounmap early_iounmap
> +#define dmi_early_remap early_ioremap
> +#define dmi_early_unmap early_iounmap
> +#define dmi_remap ioremap
> +#define dmi_unmap iounmap
>
> #endif /* _ASM_X86_DMI_H */
> diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
> index 0747872..5a29fac 100644
> --- a/drivers/firmware/Kconfig
> +++ b/drivers/firmware/Kconfig
> @@ -108,6 +108,9 @@ config DMI_SYSFS
> under /sys/firmware/dmi when this option is enabled and
> loaded.
>
> +config DMI_SCAN_MACHINE_NON_EFI_FALLBACK
> + bool
> +
> config ISCSI_IBFT_FIND
> bool "iSCSI Boot Firmware Table Attributes"
> depends on X86
> diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
> index c7e81ff..17afc51 100644
> --- a/drivers/firmware/dmi_scan.c
> +++ b/drivers/firmware/dmi_scan.c
> @@ -116,7 +116,7 @@ static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
> {
> u8 *buf;
>
> - buf = dmi_ioremap(dmi_base, dmi_len);
> + buf = dmi_early_remap(dmi_base, dmi_len);
> if (buf == NULL)
> return -1;
>
> @@ -124,7 +124,7 @@ static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
>
> add_device_randomness(buf, dmi_len);
>
> - dmi_iounmap(buf, dmi_len);
> + dmi_early_unmap(buf, dmi_len);
> return 0;
> }
>
> @@ -527,18 +527,18 @@ void __init dmi_scan_machine(void)
> * needed during early boot. This also means we can
> * iounmap the space when we're done with it.
> */
> - p = dmi_ioremap(efi.smbios, 32);
> + p = dmi_early_remap(efi.smbios, 32);
> if (p == NULL)
> goto error;
> memcpy_fromio(buf, p, 32);
> - dmi_iounmap(p, 32);
> + dmi_early_unmap(p, 32);
>
> if (!dmi_present(buf)) {
> dmi_available = 1;
> goto out;
> }
> - } else {
> - p = dmi_ioremap(0xF0000, 0x10000);
> + } else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK)) {
> + p = dmi_early_remap(0xF0000, 0x10000);
> if (p == NULL)
> goto error;
>
> @@ -554,12 +554,12 @@ void __init dmi_scan_machine(void)
> memcpy_fromio(buf + 16, q, 16);
> if (!dmi_present(buf)) {
> dmi_available = 1;
> - dmi_iounmap(p, 0x10000);
> + dmi_early_unmap(p, 0x10000);
> goto out;
> }
> memcpy(buf, buf + 16, 16);
> }
> - dmi_iounmap(p, 0x10000);
> + dmi_early_unmap(p, 0x10000);
> }
> error:
> pr_info("DMI not present or invalid.\n");
> @@ -831,13 +831,13 @@ int dmi_walk(void (*decode)(const struct dmi_header *, void *),
> if (!dmi_available)
> return -1;
>
> - buf = ioremap(dmi_base, dmi_len);
> + buf = dmi_remap(dmi_base, dmi_len);
> if (buf == NULL)
> return -1;
>
> dmi_table(buf, dmi_len, dmi_num, decode, private_data);
>
> - iounmap(buf);
> + dmi_unmap(buf);
> return 0;
> }
> EXPORT_SYMBOL_GPL(dmi_walk);
> --
> 1.8.3.2
>
--
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