diff options
| -rw-r--r-- | xen/drivers/passthrough/amd/iommu_init.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/xen/drivers/passthrough/amd/iommu_init.c b/xen/drivers/passthrough/amd/iommu_init.c index b5cb468a16..282c04c0b2 100644 --- a/xen/drivers/passthrough/amd/iommu_init.c +++ b/xen/drivers/passthrough/amd/iommu_init.c @@ -897,12 +897,45 @@ static int __init amd_iommu_setup_device_table(void) return 0; } +/* Check whether SP5100 SATA Combined mode is on */ +static bool_t __init amd_sp5100_erratum28(void) +{ + u32 bus, id; + u16 vendor_id, dev_id; + u8 byte; + + for (bus = 0; bus < 256; bus++) + { + id = pci_conf_read32(bus, 0x14, 0, PCI_VENDOR_ID); + + vendor_id = id & 0xffff; + dev_id = (id >> 16) & 0xffff; + + /* SP5100 SMBus module sets Combined mode on */ + if (vendor_id != 0x1002 || dev_id != 0x4385) + continue; + + byte = pci_conf_read8(bus, 0x14, 0, 0xad); + if ( (byte >> 3) & 1 ) + { + printk(XENLOG_WARNING "AMD-Vi: SP5100 erratum 28 detected, disabling IOMMU.\n" + "If possible, disable SATA Combined mode in BIOS or contact your vendor for BIOS update.\n"); + return 1; + } + } + + return 0; +} + int __init amd_iommu_init(void) { struct amd_iommu *iommu; BUG_ON( !iommu_found() ); + if ( amd_iommu_perdev_intremap && amd_sp5100_erratum28() ) + goto error_out; + irq_to_iommu = xmalloc_array(struct amd_iommu *, nr_irqs); if ( irq_to_iommu == NULL ) goto error_out; |