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/*
* Copyright (c) 2006, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; If not, see <http://www.gnu.org/licenses/>.
*
* Author: Allen Kay <allen.m.kay@intel.com>
*/
#include <xen/sched.h>
#include <xen/iommu.h>
#include <xen/time.h>
#include <xen/pci.h>
#include <xen/pci_regs.h>
#include <asm/msi.h>
#include "../iommu.h"
#include "../dmar.h"
#include "../vtd.h"
#include "../extern.h"
#include "../../ats.h"
static LIST_HEAD(ats_dev_drhd_units);
struct acpi_drhd_unit * find_ats_dev_drhd(struct iommu *iommu)
{
struct acpi_drhd_unit *drhd;
list_for_each_entry ( drhd, &ats_dev_drhd_units, list )
{
if ( drhd->iommu == iommu )
return drhd;
}
return NULL;
}
int ats_device(const struct pci_dev *pdev, const struct acpi_drhd_unit *drhd)
{
struct acpi_drhd_unit *ats_drhd;
int pos;
if ( !ats_enabled || !iommu_qinval )
return 0;
if ( !ecap_queued_inval(drhd->iommu->ecap) ||
!ecap_dev_iotlb(drhd->iommu->ecap) )
return 0;
if ( !acpi_find_matched_atsr_unit(pdev) )
return 0;
ats_drhd = find_ats_dev_drhd(drhd->iommu);
pos = pci_find_ext_capability(pdev->seg, pdev->bus, pdev->devfn,
PCI_EXT_CAP_ID_ATS);
if ( pos && (ats_drhd == NULL) )
{
ats_drhd = xmalloc(struct acpi_drhd_unit);
if ( !ats_drhd )
return -ENOMEM;
*ats_drhd = *drhd;
list_add_tail(&ats_drhd->list, &ats_dev_drhd_units);
}
return pos;
}
static int device_in_domain(struct iommu *iommu, struct pci_ats_dev *pdev, u16 did)
{
struct root_entry *root_entry = NULL;
struct context_entry *ctxt_entry = NULL;
int tt, found = 0;
root_entry = (struct root_entry *) map_vtd_domain_page(iommu->root_maddr);
if ( !root_entry || !root_present(root_entry[pdev->bus]) )
goto out;
ctxt_entry = (struct context_entry *)
map_vtd_domain_page(root_entry[pdev->bus].val);
if ( ctxt_entry == NULL )
goto out;
if ( context_domain_id(ctxt_entry[pdev->devfn]) != did )
goto out;
tt = context_translation_type(ctxt_entry[pdev->devfn]);
if ( tt != CONTEXT_TT_DEV_IOTLB )
goto out;
found = 1;
out:
if ( root_entry )
unmap_vtd_domain_page(root_entry);
if ( ctxt_entry )
unmap_vtd_domain_page(ctxt_entry);
return found;
}
int dev_invalidate_iotlb(struct iommu *iommu, u16 did,
u64 addr, unsigned int size_order, u64 type)
{
struct pci_ats_dev *pdev;
int ret = 0;
if ( !ecap_dev_iotlb(iommu->ecap) )
return ret;
list_for_each_entry( pdev, &ats_devices, list )
{
u16 sid = PCI_BDF2(pdev->bus, pdev->devfn);
bool_t sbit;
int rc = 0;
/* Only invalidate devices that belong to this IOMMU */
if ( pdev->iommu != iommu )
continue;
switch ( type )
{
case DMA_TLB_DSI_FLUSH:
if ( !device_in_domain(iommu, pdev, did) )
break;
/* fall through if DSI condition met */
case DMA_TLB_GLOBAL_FLUSH:
/* invalidate all translations: sbit=1,bit_63=0,bit[62:12]=1 */
sbit = 1;
addr = (~0 << PAGE_SHIFT_4K) & 0x7FFFFFFFFFFFFFFF;
rc = qinval_device_iotlb(iommu, pdev->ats_queue_depth,
sid, sbit, addr);
break;
case DMA_TLB_PSI_FLUSH:
if ( !device_in_domain(iommu, pdev, did) )
break;
/* if size <= 4K, set sbit = 0, else set sbit = 1 */
sbit = size_order ? 1 : 0;
/* clear lower bits */
addr &= ~0 << PAGE_SHIFT_4K;
/* if sbit == 1, zero out size_order bit and set lower bits to 1 */
if ( sbit )
{
addr &= ~((u64)PAGE_SIZE_4K << (size_order - 1));
addr |= (((u64)1 << (size_order - 1)) - 1) << PAGE_SHIFT_4K;
}
rc = qinval_device_iotlb(iommu, pdev->ats_queue_depth,
sid, sbit, addr);
break;
default:
dprintk(XENLOG_WARNING VTDPREFIX, "invalid vt-d flush type\n");
return -EOPNOTSUPP;
}
if ( !ret )
ret = rc;
}
return ret;
}
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