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Commit be2a022c authored by Joerg Roedel's avatar Joerg Roedel Committed by Ingo Molnar
Browse files

x86, AMD IOMMU: add functions to parse IOMMU memory mapping requirements for devices 



This patch adds the functions to parse the information about IOMMU exclusion
ranges and required unity mappings for the devices handled by the IOMMU.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
Cc: iommu@lists.linux-foundation.org
Cc: bhavna.sarathy@amd.com
Cc: Sebastian.Biemueller@amd.com
Cc: robert.richter@amd.com
Cc: joro@8bytes.org
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent e47d402d

arch/x86/kernel/amd_iommu_init.c

+87 −0
Original line number Diff line number Diff line
@@ -556,3 +556,90 @@ static int __init init_iommu_all(struct acpi_table_header *table) 
	return 0;

}



static void __init free_unity_maps(void)

{

	struct unity_map_entry *entry, *next;



	list_for_each_entry_safe(entry, next, &amd_iommu_unity_map, list) {

		list_del(&entry->list);

		kfree(entry);

	}

}



static int __init init_exclusion_range(struct ivmd_header *m)

{

	int i;



	switch (m->type) {

	case ACPI_IVMD_TYPE:

		set_device_exclusion_range(m->devid, m);

		break;

	case ACPI_IVMD_TYPE_ALL:

		for (i = 0; i < amd_iommu_last_bdf; ++i)

			set_device_exclusion_range(i, m);

		break;

	case ACPI_IVMD_TYPE_RANGE:

		for (i = m->devid; i <= m->aux; ++i)

			set_device_exclusion_range(i, m);

		break;

	default:

		break;

	}



	return 0;

}



static int __init init_unity_map_range(struct ivmd_header *m)

{

	struct unity_map_entry *e = 0;



	e = kzalloc(sizeof(*e), GFP_KERNEL);

	if (e == NULL)

		return -ENOMEM;



	switch (m->type) {

	default:

	case ACPI_IVMD_TYPE:

		e->devid_start = e->devid_end = m->devid;

		break;

	case ACPI_IVMD_TYPE_ALL:

		e->devid_start = 0;

		e->devid_end = amd_iommu_last_bdf;

		break;

	case ACPI_IVMD_TYPE_RANGE:

		e->devid_start = m->devid;

		e->devid_end = m->aux;

		break;

	}

	e->address_start = PAGE_ALIGN(m->range_start);

	e->address_end = e->address_start + PAGE_ALIGN(m->range_length);

	e->prot = m->flags >> 1;



	list_add_tail(&e->list, &amd_iommu_unity_map);



	return 0;

}



static int __init init_memory_definitions(struct acpi_table_header *table)

{

	u8 *p = (u8 *)table, *end = (u8 *)table;

	struct ivmd_header *m;



	INIT_LIST_HEAD(&amd_iommu_unity_map);



	end += table->length;

	p += IVRS_HEADER_LENGTH;



	while (p < end) {

		m = (struct ivmd_header *)p;

		if (m->flags & IVMD_FLAG_EXCL_RANGE)

			init_exclusion_range(m);

		else if (m->flags & IVMD_FLAG_UNITY_MAP)

			init_unity_map_range(m);



		p += m->length;

	}



	return 0;

}