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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: Joerg 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: Ingo Molnar <mingo@elte.hu>
hifive-unleashed-5.1
Joerg Roedel 2008-06-26 21:27:48 +02:00 committed by Ingo Molnar
parent 5d0c8e49f8
commit e47d402d2d
1 changed files with 78 additions and 0 deletions
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78
arch/x86/kernel/amd_iommu_init.c
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@ -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;
}