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x86, AMD IOMMU: initialize device table properly 

This patch adds device table initializations which forbids memory accesses
for devices per default and disables all page faults.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Joerg Roedel 2008-08-14 19:55:16 +02:00 committed by Ingo Molnar
parent 519c31bacf
commit 9f5f5fb35d
2 changed files with 19 additions and 0 deletions
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18
arch/x86/kernel/amd_iommu_init.c
View File

@ -800,6 +800,21 @@ static int __init init_memory_definitions(struct acpi_table_header *table)
return 0;
}
/*
* Init the device table to not allow DMA access for devices and
* suppress all page faults
*/
static void init_device_table(void)
{
u16 devid;
for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) {
set_dev_entry_bit(devid, DEV_ENTRY_VALID);
set_dev_entry_bit(devid, DEV_ENTRY_TRANSLATION);
set_dev_entry_bit(devid, DEV_ENTRY_NO_PAGE_FAULT);
}
}
/*
* This function finally enables all IOMMUs found in the system after
* they have been initialized
@ -931,6 +946,9 @@ int __init amd_iommu_init(void)
if (amd_iommu_pd_alloc_bitmap == NULL)
goto free;
/* init the device table */
init_device_table();
/*
* let all alias entries point to itself
*/

1
include/asm-x86/amd_iommu_types.h
View File

@ -103,6 +103,7 @@
#define DEV_ENTRY_TRANSLATION 0x01
#define DEV_ENTRY_IR 0x3d
#define DEV_ENTRY_IW 0x3e
#define DEV_ENTRY_NO_PAGE_FAULT 0x62
#define DEV_ENTRY_EX 0x67
#define DEV_ENTRY_SYSMGT1 0x68
#define DEV_ENTRY_SYSMGT2 0x69