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Commit e47d402d authored by Joerg Roedel's avatar Joerg Roedel Committed by Ingo Molnar
Browse files

x86, AMD IOMMU: add detect code for AMD IOMMU hardware 



This patch adds the detection of AMD IOMMU hardware provided on information
from ACPI provided by the BIOS.

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 5d0c8e49

arch/x86/kernel/amd_iommu_init.c

+78 −0
Original line number Diff line number Diff line
@@ -478,3 +478,81 @@ static int __init init_iommu_devices(struct amd_iommu *iommu) 
	return 0;

}



static void __init free_iommu_one(struct amd_iommu *iommu)

{

	free_command_buffer(iommu);

	iommu_unmap_mmio_space(iommu);

}



static void __init free_iommu_all(void)

{

	struct amd_iommu *iommu, *next;



	list_for_each_entry_safe(iommu, next, &amd_iommu_list, list) {

		list_del(&iommu->list);

		free_iommu_one(iommu);

		kfree(iommu);

	}

}



static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)

{

	spin_lock_init(&iommu->lock);

	list_add_tail(&iommu->list, &amd_iommu_list);



	/*

	 * Copy data from ACPI table entry to the iommu struct

	 */

	iommu->devid = h->devid;

	iommu->cap_ptr = h->cap_ptr;

	iommu->mmio_phys = h->mmio_phys;

	iommu->mmio_base = iommu_map_mmio_space(h->mmio_phys);

	if (!iommu->mmio_base)

		return -ENOMEM;



	iommu_set_device_table(iommu);

	iommu->cmd_buf = alloc_command_buffer(iommu);

	if (!iommu->cmd_buf)

		return -ENOMEM;



	init_iommu_from_pci(iommu);

	init_iommu_from_acpi(iommu, h);

	init_iommu_devices(iommu);



	return 0;

}



static int __init init_iommu_all(struct acpi_table_header *table)

{

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

	struct ivhd_header *h;

	struct amd_iommu *iommu;

	int ret;



	INIT_LIST_HEAD(&amd_iommu_list);



	end += table->length;

	p += IVRS_HEADER_LENGTH;



	while (p < end) {

		h = (struct ivhd_header *)p;

		switch (*p) {

		case ACPI_IVHD_TYPE:

			iommu = kzalloc(sizeof(struct amd_iommu), GFP_KERNEL);

			if (iommu == NULL)

				return -ENOMEM;

			ret = init_iommu_one(iommu, h);

			if (ret)

				return ret;

			break;

		default:

			break;

		}

		p += h->length;



	}

	WARN_ON(p != end);



	return 0;

}