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Commit 9f5f5fb3 authored by Joerg Roedel's avatar Joerg Roedel Committed by Ingo Molnar
Browse files

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: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 519c31ba

arch/x86/kernel/amd_iommu_init.c

+18 −0
Original line number Diff line number Diff line
@@ -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

	 */

include/asm-x86/amd_iommu_types.h

+1 −0
Original line number Diff line number Diff line
@@ -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