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firmware/dmi_scan: generalize for use by other archs

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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@linaro.org>
Acked-by: Grant Likely <grant.likely@linaro.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ard Biesheuvel
2014-01-23 15:54:39 -08:00
committed by Linus Torvalds
parent 3e2a4c183a
commit cf0744021c
6 changed files with 24 additions and 15 deletions
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20
drivers/firmware/dmi_scan.c
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@@ -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);