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x86, AMD IOMMU: add functions for IOMMU hardware initialization from ACPI 

This patch adds functions to initialize the IOMMU hardware with information
from ACPI and PCI.

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 21:27:47 +02:00 committed by Ingo Molnar
parent 3566b7786a
commit 5d0c8e49f8
1 changed files with 125 additions and 0 deletions
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125
arch/x86/kernel/amd_iommu_init.c
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@ -353,3 +353,128 @@ static void __init set_device_exclusion_range(u16 devid, struct ivmd_header *m)
}
}
static void __init init_iommu_from_pci(struct amd_iommu *iommu)
{
int bus = PCI_BUS(iommu->devid);
int dev = PCI_SLOT(iommu->devid);
int fn = PCI_FUNC(iommu->devid);
int cap_ptr = iommu->cap_ptr;
u32 range;
iommu->cap = read_pci_config(bus, dev, fn, cap_ptr+MMIO_CAP_HDR_OFFSET);
range = read_pci_config(bus, dev, fn, cap_ptr+MMIO_RANGE_OFFSET);
iommu->first_device = DEVID(MMIO_GET_BUS(range), MMIO_GET_FD(range));
iommu->last_device = DEVID(MMIO_GET_BUS(range), MMIO_GET_LD(range));
}
static void __init init_iommu_from_acpi(struct amd_iommu *iommu,
struct ivhd_header *h)
{
u8 *p = (u8 *)h;
u8 *end = p, flags = 0;
u16 dev_i, devid = 0, devid_start = 0, devid_to = 0;
u32 ext_flags = 0;
bool alias = 0;
struct ivhd_entry *e;
/*
* First set the recommended feature enable bits from ACPI
* into the IOMMU control registers
*/
h->flags & IVHD_FLAG_HT_TUN_EN ?
iommu_feature_enable(iommu, CONTROL_HT_TUN_EN) :
iommu_feature_disable(iommu, CONTROL_HT_TUN_EN);
h->flags & IVHD_FLAG_PASSPW_EN ?
iommu_feature_enable(iommu, CONTROL_PASSPW_EN) :
iommu_feature_disable(iommu, CONTROL_PASSPW_EN);
h->flags & IVHD_FLAG_RESPASSPW_EN ?
iommu_feature_enable(iommu, CONTROL_RESPASSPW_EN) :
iommu_feature_disable(iommu, CONTROL_RESPASSPW_EN);
h->flags & IVHD_FLAG_ISOC_EN ?
iommu_feature_enable(iommu, CONTROL_ISOC_EN) :
iommu_feature_disable(iommu, CONTROL_ISOC_EN);
/*
* make IOMMU memory accesses cache coherent
*/
iommu_feature_enable(iommu, CONTROL_COHERENT_EN);
/*
* Done. Now parse the device entries
*/
p += sizeof(struct ivhd_header);
end += h->length;
while (p < end) {
e = (struct ivhd_entry *)p;
switch (e->type) {
case IVHD_DEV_ALL:
for (dev_i = iommu->first_device;
dev_i <= iommu->last_device; ++dev_i)
set_dev_entry_from_acpi(dev_i, e->flags, 0);
break;
case IVHD_DEV_SELECT:
devid = e->devid;
set_dev_entry_from_acpi(devid, e->flags, 0);
break;
case IVHD_DEV_SELECT_RANGE_START:
devid_start = e->devid;
flags = e->flags;
ext_flags = 0;
alias = 0;
break;
case IVHD_DEV_ALIAS:
devid = e->devid;
devid_to = e->ext >> 8;
set_dev_entry_from_acpi(devid, e->flags, 0);
amd_iommu_alias_table[devid] = devid_to;
break;
case IVHD_DEV_ALIAS_RANGE:
devid_start = e->devid;
flags = e->flags;
devid_to = e->ext >> 8;
ext_flags = 0;
alias = 1;
break;
case IVHD_DEV_EXT_SELECT:
devid = e->devid;
set_dev_entry_from_acpi(devid, e->flags, e->ext);
break;
case IVHD_DEV_EXT_SELECT_RANGE:
devid_start = e->devid;
flags = e->flags;
ext_flags = e->ext;
alias = 0;
break;
case IVHD_DEV_RANGE_END:
devid = e->devid;
for (dev_i = devid_start; dev_i <= devid; ++dev_i) {
if (alias)
amd_iommu_alias_table[dev_i] = devid_to;
set_dev_entry_from_acpi(
amd_iommu_alias_table[dev_i],
flags, ext_flags);
}
break;
default:
break;
}
p += 0x04 << (e->type >> 6);
}
}
static int __init init_iommu_devices(struct amd_iommu *iommu)
{
u16 i;
for (i = iommu->first_device; i <= iommu->last_device; ++i)
set_iommu_for_device(iommu, i);
return 0;
}