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intel-iommu: Detect DMAR in hyperspace at probe time.

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commit 2c99220810 upstream.

Many BIOSes will lie to us about the existence of an IOMMU, and claim
that there is one at an address which actually returns all 0xFF.

We need to detect this early, so that we know we don't have a viable
IOMMU and can set up swiotlb before it's too late.

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Chris Wright
2009-12-02 09:17:13 +00:00
committed by Greg Kroah-Hartman
parent 3a03456dc3
commit 518cdfa0f6
1 changed files with 29 additions and 5 deletions
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34
drivers/pci/dmar.c
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@@ -601,6 +601,9 @@ int __init check_zero_address(void)
}
if (entry_header->type == ACPI_DMAR_TYPE_HARDWARE_UNIT) {
void __iomem *addr;
u64 cap, ecap;
drhd = (void *)entry_header;
if (!drhd->address) {
/* Promote an attitude of violence to a BIOS engineer today */
@@ -609,17 +612,38 @@ int __init check_zero_address(void)
dmi_get_system_info(DMI_BIOS_VENDOR),
dmi_get_system_info(DMI_BIOS_VERSION),
dmi_get_system_info(DMI_PRODUCT_VERSION));
#ifdef CONFIG_DMAR
dmar_disabled = 1;
#endif
return 0;
goto failed;
}
addr = early_ioremap(drhd->address, VTD_PAGE_SIZE);
if (!addr ) {
printk("IOMMU: can't validate: %llx\n", drhd->address);
goto failed;
}
cap = dmar_readq(addr + DMAR_CAP_REG);
ecap = dmar_readq(addr + DMAR_ECAP_REG);
early_iounmap(addr, VTD_PAGE_SIZE);
if (cap == (uint64_t)-1 && ecap == (uint64_t)-1) {
/* Promote an attitude of violence to a BIOS engineer today */
WARN(1, "Your BIOS is broken; DMAR reported at address %llx returns all ones!\n"
"BIOS vendor: %s; Ver: %s; Product Version: %s\n",
drhd->address,
dmi_get_system_info(DMI_BIOS_VENDOR),
dmi_get_system_info(DMI_BIOS_VERSION),
dmi_get_system_info(DMI_PRODUCT_VERSION));
goto failed;
}
break;
}
entry_header = ((void *)entry_header + entry_header->length);
}
return 1;
failed:
#ifdef CONFIG_DMAR
dmar_disabled = 1;
#endif
return 0;
}
void __init detect_intel_iommu(void)