forked from Minki/linux
52815b7568
This patch adds support for protection domains that implement two-level paging for devices. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
3149 lines
71 KiB
C
3149 lines
71 KiB
C
/*
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* Copyright (C) 2007-2010 Advanced Micro Devices, Inc.
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* Author: Joerg Roedel <joerg.roedel@amd.com>
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* Leo Duran <leo.duran@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/ratelimit.h>
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#include <linux/pci.h>
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#include <linux/pci-ats.h>
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#include <linux/bitmap.h>
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#include <linux/slab.h>
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#include <linux/debugfs.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-mapping.h>
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#include <linux/iommu-helper.h>
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#include <linux/iommu.h>
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#include <linux/delay.h>
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#include <linux/amd-iommu.h>
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#include <linux/notifier.h>
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#include <linux/export.h>
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#include <asm/msidef.h>
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#include <asm/proto.h>
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#include <asm/iommu.h>
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#include <asm/gart.h>
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#include <asm/dma.h>
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#include "amd_iommu_proto.h"
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#include "amd_iommu_types.h"
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#define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28))
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#define LOOP_TIMEOUT 100000
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static DEFINE_RWLOCK(amd_iommu_devtable_lock);
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/* A list of preallocated protection domains */
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static LIST_HEAD(iommu_pd_list);
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static DEFINE_SPINLOCK(iommu_pd_list_lock);
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/* List of all available dev_data structures */
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static LIST_HEAD(dev_data_list);
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static DEFINE_SPINLOCK(dev_data_list_lock);
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/*
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* Domain for untranslated devices - only allocated
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* if iommu=pt passed on kernel cmd line.
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*/
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static struct protection_domain *pt_domain;
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static struct iommu_ops amd_iommu_ops;
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static ATOMIC_NOTIFIER_HEAD(ppr_notifier);
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int amd_iommu_max_glx_val = -1;
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/*
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* general struct to manage commands send to an IOMMU
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*/
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struct iommu_cmd {
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u32 data[4];
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};
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static void update_domain(struct protection_domain *domain);
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static int __init alloc_passthrough_domain(void);
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/****************************************************************************
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*
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* Helper functions
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*
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****************************************************************************/
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static struct iommu_dev_data *alloc_dev_data(u16 devid)
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{
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struct iommu_dev_data *dev_data;
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unsigned long flags;
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dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL);
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if (!dev_data)
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return NULL;
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dev_data->devid = devid;
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atomic_set(&dev_data->bind, 0);
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spin_lock_irqsave(&dev_data_list_lock, flags);
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list_add_tail(&dev_data->dev_data_list, &dev_data_list);
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spin_unlock_irqrestore(&dev_data_list_lock, flags);
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return dev_data;
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}
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static void free_dev_data(struct iommu_dev_data *dev_data)
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{
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unsigned long flags;
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spin_lock_irqsave(&dev_data_list_lock, flags);
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list_del(&dev_data->dev_data_list);
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spin_unlock_irqrestore(&dev_data_list_lock, flags);
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kfree(dev_data);
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}
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static struct iommu_dev_data *search_dev_data(u16 devid)
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{
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struct iommu_dev_data *dev_data;
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unsigned long flags;
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spin_lock_irqsave(&dev_data_list_lock, flags);
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list_for_each_entry(dev_data, &dev_data_list, dev_data_list) {
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if (dev_data->devid == devid)
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goto out_unlock;
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}
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dev_data = NULL;
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out_unlock:
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spin_unlock_irqrestore(&dev_data_list_lock, flags);
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return dev_data;
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}
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static struct iommu_dev_data *find_dev_data(u16 devid)
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{
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struct iommu_dev_data *dev_data;
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dev_data = search_dev_data(devid);
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if (dev_data == NULL)
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dev_data = alloc_dev_data(devid);
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return dev_data;
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}
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static inline u16 get_device_id(struct device *dev)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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return calc_devid(pdev->bus->number, pdev->devfn);
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}
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static struct iommu_dev_data *get_dev_data(struct device *dev)
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{
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return dev->archdata.iommu;
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}
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static bool pci_iommuv2_capable(struct pci_dev *pdev)
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{
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static const int caps[] = {
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PCI_EXT_CAP_ID_ATS,
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PCI_PRI_CAP,
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PCI_PASID_CAP,
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};
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int i, pos;
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for (i = 0; i < 3; ++i) {
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pos = pci_find_ext_capability(pdev, caps[i]);
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if (pos == 0)
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return false;
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}
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return true;
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}
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/*
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* In this function the list of preallocated protection domains is traversed to
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* find the domain for a specific device
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*/
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static struct dma_ops_domain *find_protection_domain(u16 devid)
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{
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struct dma_ops_domain *entry, *ret = NULL;
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unsigned long flags;
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u16 alias = amd_iommu_alias_table[devid];
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if (list_empty(&iommu_pd_list))
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return NULL;
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spin_lock_irqsave(&iommu_pd_list_lock, flags);
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list_for_each_entry(entry, &iommu_pd_list, list) {
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if (entry->target_dev == devid ||
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entry->target_dev == alias) {
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ret = entry;
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break;
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}
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}
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spin_unlock_irqrestore(&iommu_pd_list_lock, flags);
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return ret;
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}
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/*
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* This function checks if the driver got a valid device from the caller to
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* avoid dereferencing invalid pointers.
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*/
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static bool check_device(struct device *dev)
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{
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u16 devid;
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if (!dev || !dev->dma_mask)
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return false;
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/* No device or no PCI device */
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if (dev->bus != &pci_bus_type)
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return false;
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devid = get_device_id(dev);
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/* Out of our scope? */
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if (devid > amd_iommu_last_bdf)
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return false;
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if (amd_iommu_rlookup_table[devid] == NULL)
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return false;
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return true;
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}
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static int iommu_init_device(struct device *dev)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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struct iommu_dev_data *dev_data;
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u16 alias;
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if (dev->archdata.iommu)
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return 0;
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dev_data = find_dev_data(get_device_id(dev));
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if (!dev_data)
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return -ENOMEM;
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alias = amd_iommu_alias_table[dev_data->devid];
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if (alias != dev_data->devid) {
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struct iommu_dev_data *alias_data;
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alias_data = find_dev_data(alias);
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if (alias_data == NULL) {
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pr_err("AMD-Vi: Warning: Unhandled device %s\n",
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dev_name(dev));
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free_dev_data(dev_data);
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return -ENOTSUPP;
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}
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dev_data->alias_data = alias_data;
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}
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if (pci_iommuv2_capable(pdev)) {
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struct amd_iommu *iommu;
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iommu = amd_iommu_rlookup_table[dev_data->devid];
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dev_data->iommu_v2 = iommu->is_iommu_v2;
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}
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dev->archdata.iommu = dev_data;
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return 0;
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}
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static void iommu_ignore_device(struct device *dev)
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{
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u16 devid, alias;
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devid = get_device_id(dev);
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alias = amd_iommu_alias_table[devid];
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memset(&amd_iommu_dev_table[devid], 0, sizeof(struct dev_table_entry));
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memset(&amd_iommu_dev_table[alias], 0, sizeof(struct dev_table_entry));
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amd_iommu_rlookup_table[devid] = NULL;
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amd_iommu_rlookup_table[alias] = NULL;
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}
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static void iommu_uninit_device(struct device *dev)
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{
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/*
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* Nothing to do here - we keep dev_data around for unplugged devices
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* and reuse it when the device is re-plugged - not doing so would
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* introduce a ton of races.
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*/
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}
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void __init amd_iommu_uninit_devices(void)
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{
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struct iommu_dev_data *dev_data, *n;
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struct pci_dev *pdev = NULL;
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for_each_pci_dev(pdev) {
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if (!check_device(&pdev->dev))
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continue;
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iommu_uninit_device(&pdev->dev);
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}
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/* Free all of our dev_data structures */
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list_for_each_entry_safe(dev_data, n, &dev_data_list, dev_data_list)
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free_dev_data(dev_data);
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}
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int __init amd_iommu_init_devices(void)
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{
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struct pci_dev *pdev = NULL;
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int ret = 0;
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for_each_pci_dev(pdev) {
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if (!check_device(&pdev->dev))
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continue;
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ret = iommu_init_device(&pdev->dev);
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if (ret == -ENOTSUPP)
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iommu_ignore_device(&pdev->dev);
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else if (ret)
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goto out_free;
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}
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return 0;
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out_free:
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amd_iommu_uninit_devices();
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return ret;
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}
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#ifdef CONFIG_AMD_IOMMU_STATS
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/*
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* Initialization code for statistics collection
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*/
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DECLARE_STATS_COUNTER(compl_wait);
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DECLARE_STATS_COUNTER(cnt_map_single);
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DECLARE_STATS_COUNTER(cnt_unmap_single);
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DECLARE_STATS_COUNTER(cnt_map_sg);
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DECLARE_STATS_COUNTER(cnt_unmap_sg);
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DECLARE_STATS_COUNTER(cnt_alloc_coherent);
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DECLARE_STATS_COUNTER(cnt_free_coherent);
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DECLARE_STATS_COUNTER(cross_page);
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DECLARE_STATS_COUNTER(domain_flush_single);
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DECLARE_STATS_COUNTER(domain_flush_all);
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DECLARE_STATS_COUNTER(alloced_io_mem);
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DECLARE_STATS_COUNTER(total_map_requests);
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static struct dentry *stats_dir;
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static struct dentry *de_fflush;
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static void amd_iommu_stats_add(struct __iommu_counter *cnt)
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{
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if (stats_dir == NULL)
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return;
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cnt->dent = debugfs_create_u64(cnt->name, 0444, stats_dir,
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&cnt->value);
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}
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static void amd_iommu_stats_init(void)
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{
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stats_dir = debugfs_create_dir("amd-iommu", NULL);
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if (stats_dir == NULL)
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return;
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de_fflush = debugfs_create_bool("fullflush", 0444, stats_dir,
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(u32 *)&amd_iommu_unmap_flush);
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amd_iommu_stats_add(&compl_wait);
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amd_iommu_stats_add(&cnt_map_single);
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amd_iommu_stats_add(&cnt_unmap_single);
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amd_iommu_stats_add(&cnt_map_sg);
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amd_iommu_stats_add(&cnt_unmap_sg);
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amd_iommu_stats_add(&cnt_alloc_coherent);
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amd_iommu_stats_add(&cnt_free_coherent);
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amd_iommu_stats_add(&cross_page);
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amd_iommu_stats_add(&domain_flush_single);
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amd_iommu_stats_add(&domain_flush_all);
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amd_iommu_stats_add(&alloced_io_mem);
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amd_iommu_stats_add(&total_map_requests);
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}
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#endif
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/****************************************************************************
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*
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* Interrupt handling functions
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*
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****************************************************************************/
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static void dump_dte_entry(u16 devid)
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{
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int i;
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for (i = 0; i < 4; ++i)
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pr_err("AMD-Vi: DTE[%d]: %016llx\n", i,
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amd_iommu_dev_table[devid].data[i]);
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}
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static void dump_command(unsigned long phys_addr)
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{
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struct iommu_cmd *cmd = phys_to_virt(phys_addr);
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int i;
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for (i = 0; i < 4; ++i)
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pr_err("AMD-Vi: CMD[%d]: %08x\n", i, cmd->data[i]);
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}
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static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
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{
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u32 *event = __evt;
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int type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK;
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int devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK;
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int domid = (event[1] >> EVENT_DOMID_SHIFT) & EVENT_DOMID_MASK;
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int flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK;
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u64 address = (u64)(((u64)event[3]) << 32) | event[2];
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printk(KERN_ERR "AMD-Vi: Event logged [");
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switch (type) {
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case EVENT_TYPE_ILL_DEV:
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printk("ILLEGAL_DEV_TABLE_ENTRY device=%02x:%02x.%x "
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"address=0x%016llx flags=0x%04x]\n",
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PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
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address, flags);
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dump_dte_entry(devid);
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break;
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case EVENT_TYPE_IO_FAULT:
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printk("IO_PAGE_FAULT device=%02x:%02x.%x "
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"domain=0x%04x address=0x%016llx flags=0x%04x]\n",
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PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
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domid, address, flags);
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break;
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case EVENT_TYPE_DEV_TAB_ERR:
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printk("DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
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"address=0x%016llx flags=0x%04x]\n",
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PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
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address, flags);
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break;
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case EVENT_TYPE_PAGE_TAB_ERR:
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printk("PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
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"domain=0x%04x address=0x%016llx flags=0x%04x]\n",
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PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
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domid, address, flags);
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break;
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case EVENT_TYPE_ILL_CMD:
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printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address);
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dump_command(address);
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break;
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case EVENT_TYPE_CMD_HARD_ERR:
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printk("COMMAND_HARDWARE_ERROR address=0x%016llx "
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"flags=0x%04x]\n", address, flags);
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break;
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case EVENT_TYPE_IOTLB_INV_TO:
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printk("IOTLB_INV_TIMEOUT device=%02x:%02x.%x "
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"address=0x%016llx]\n",
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PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
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address);
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break;
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case EVENT_TYPE_INV_DEV_REQ:
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printk("INVALID_DEVICE_REQUEST device=%02x:%02x.%x "
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"address=0x%016llx flags=0x%04x]\n",
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PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
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address, flags);
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break;
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default:
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printk(KERN_ERR "UNKNOWN type=0x%02x]\n", type);
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}
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}
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|
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static void iommu_poll_events(struct amd_iommu *iommu)
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{
|
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u32 head, tail;
|
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unsigned long flags;
|
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spin_lock_irqsave(&iommu->lock, flags);
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head = readl(iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
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tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);
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|
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while (head != tail) {
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iommu_print_event(iommu, iommu->evt_buf + head);
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head = (head + EVENT_ENTRY_SIZE) % iommu->evt_buf_size;
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}
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writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
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|
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spin_unlock_irqrestore(&iommu->lock, flags);
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}
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|
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static void iommu_handle_ppr_entry(struct amd_iommu *iommu, u32 head)
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{
|
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struct amd_iommu_fault fault;
|
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volatile u64 *raw;
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int i;
|
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|
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raw = (u64 *)(iommu->ppr_log + head);
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|
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/*
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* Hardware bug: Interrupt may arrive before the entry is written to
|
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* memory. If this happens we need to wait for the entry to arrive.
|
|
*/
|
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for (i = 0; i < LOOP_TIMEOUT; ++i) {
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if (PPR_REQ_TYPE(raw[0]) != 0)
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break;
|
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udelay(1);
|
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}
|
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|
|
if (PPR_REQ_TYPE(raw[0]) != PPR_REQ_FAULT) {
|
|
pr_err_ratelimited("AMD-Vi: Unknown PPR request received\n");
|
|
return;
|
|
}
|
|
|
|
fault.address = raw[1];
|
|
fault.pasid = PPR_PASID(raw[0]);
|
|
fault.device_id = PPR_DEVID(raw[0]);
|
|
fault.tag = PPR_TAG(raw[0]);
|
|
fault.flags = PPR_FLAGS(raw[0]);
|
|
|
|
/*
|
|
* To detect the hardware bug we need to clear the entry
|
|
* to back to zero.
|
|
*/
|
|
raw[0] = raw[1] = 0;
|
|
|
|
atomic_notifier_call_chain(&ppr_notifier, 0, &fault);
|
|
}
|
|
|
|
static void iommu_poll_ppr_log(struct amd_iommu *iommu)
|
|
{
|
|
unsigned long flags;
|
|
u32 head, tail;
|
|
|
|
if (iommu->ppr_log == NULL)
|
|
return;
|
|
|
|
spin_lock_irqsave(&iommu->lock, flags);
|
|
|
|
head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
|
|
tail = readl(iommu->mmio_base + MMIO_PPR_TAIL_OFFSET);
|
|
|
|
while (head != tail) {
|
|
|
|
/* Handle PPR entry */
|
|
iommu_handle_ppr_entry(iommu, head);
|
|
|
|
/* Update and refresh ring-buffer state*/
|
|
head = (head + PPR_ENTRY_SIZE) % PPR_LOG_SIZE;
|
|
writel(head, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
|
|
tail = readl(iommu->mmio_base + MMIO_PPR_TAIL_OFFSET);
|
|
}
|
|
|
|
/* enable ppr interrupts again */
|
|
writel(MMIO_STATUS_PPR_INT_MASK, iommu->mmio_base + MMIO_STATUS_OFFSET);
|
|
|
|
spin_unlock_irqrestore(&iommu->lock, flags);
|
|
}
|
|
|
|
irqreturn_t amd_iommu_int_thread(int irq, void *data)
|
|
{
|
|
struct amd_iommu *iommu;
|
|
|
|
for_each_iommu(iommu) {
|
|
iommu_poll_events(iommu);
|
|
iommu_poll_ppr_log(iommu);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
irqreturn_t amd_iommu_int_handler(int irq, void *data)
|
|
{
|
|
return IRQ_WAKE_THREAD;
|
|
}
|
|
|
|
/****************************************************************************
|
|
*
|
|
* IOMMU command queuing functions
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int wait_on_sem(volatile u64 *sem)
|
|
{
|
|
int i = 0;
|
|
|
|
while (*sem == 0 && i < LOOP_TIMEOUT) {
|
|
udelay(1);
|
|
i += 1;
|
|
}
|
|
|
|
if (i == LOOP_TIMEOUT) {
|
|
pr_alert("AMD-Vi: Completion-Wait loop timed out\n");
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void copy_cmd_to_buffer(struct amd_iommu *iommu,
|
|
struct iommu_cmd *cmd,
|
|
u32 tail)
|
|
{
|
|
u8 *target;
|
|
|
|
target = iommu->cmd_buf + tail;
|
|
tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size;
|
|
|
|
/* Copy command to buffer */
|
|
memcpy(target, cmd, sizeof(*cmd));
|
|
|
|
/* Tell the IOMMU about it */
|
|
writel(tail, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
|
|
}
|
|
|
|
static void build_completion_wait(struct iommu_cmd *cmd, u64 address)
|
|
{
|
|
WARN_ON(address & 0x7ULL);
|
|
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
cmd->data[0] = lower_32_bits(__pa(address)) | CMD_COMPL_WAIT_STORE_MASK;
|
|
cmd->data[1] = upper_32_bits(__pa(address));
|
|
cmd->data[2] = 1;
|
|
CMD_SET_TYPE(cmd, CMD_COMPL_WAIT);
|
|
}
|
|
|
|
static void build_inv_dte(struct iommu_cmd *cmd, u16 devid)
|
|
{
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
cmd->data[0] = devid;
|
|
CMD_SET_TYPE(cmd, CMD_INV_DEV_ENTRY);
|
|
}
|
|
|
|
static void build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address,
|
|
size_t size, u16 domid, int pde)
|
|
{
|
|
u64 pages;
|
|
int s;
|
|
|
|
pages = iommu_num_pages(address, size, PAGE_SIZE);
|
|
s = 0;
|
|
|
|
if (pages > 1) {
|
|
/*
|
|
* If we have to flush more than one page, flush all
|
|
* TLB entries for this domain
|
|
*/
|
|
address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS;
|
|
s = 1;
|
|
}
|
|
|
|
address &= PAGE_MASK;
|
|
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
cmd->data[1] |= domid;
|
|
cmd->data[2] = lower_32_bits(address);
|
|
cmd->data[3] = upper_32_bits(address);
|
|
CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES);
|
|
if (s) /* size bit - we flush more than one 4kb page */
|
|
cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
|
|
if (pde) /* PDE bit - we wan't flush everything not only the PTEs */
|
|
cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK;
|
|
}
|
|
|
|
static void build_inv_iotlb_pages(struct iommu_cmd *cmd, u16 devid, int qdep,
|
|
u64 address, size_t size)
|
|
{
|
|
u64 pages;
|
|
int s;
|
|
|
|
pages = iommu_num_pages(address, size, PAGE_SIZE);
|
|
s = 0;
|
|
|
|
if (pages > 1) {
|
|
/*
|
|
* If we have to flush more than one page, flush all
|
|
* TLB entries for this domain
|
|
*/
|
|
address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS;
|
|
s = 1;
|
|
}
|
|
|
|
address &= PAGE_MASK;
|
|
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
cmd->data[0] = devid;
|
|
cmd->data[0] |= (qdep & 0xff) << 24;
|
|
cmd->data[1] = devid;
|
|
cmd->data[2] = lower_32_bits(address);
|
|
cmd->data[3] = upper_32_bits(address);
|
|
CMD_SET_TYPE(cmd, CMD_INV_IOTLB_PAGES);
|
|
if (s)
|
|
cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
|
|
}
|
|
|
|
static void build_inv_all(struct iommu_cmd *cmd)
|
|
{
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
CMD_SET_TYPE(cmd, CMD_INV_ALL);
|
|
}
|
|
|
|
/*
|
|
* Writes the command to the IOMMUs command buffer and informs the
|
|
* hardware about the new command.
|
|
*/
|
|
static int iommu_queue_command_sync(struct amd_iommu *iommu,
|
|
struct iommu_cmd *cmd,
|
|
bool sync)
|
|
{
|
|
u32 left, tail, head, next_tail;
|
|
unsigned long flags;
|
|
|
|
WARN_ON(iommu->cmd_buf_size & CMD_BUFFER_UNINITIALIZED);
|
|
|
|
again:
|
|
spin_lock_irqsave(&iommu->lock, flags);
|
|
|
|
head = readl(iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
|
|
tail = readl(iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
|
|
next_tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size;
|
|
left = (head - next_tail) % iommu->cmd_buf_size;
|
|
|
|
if (left <= 2) {
|
|
struct iommu_cmd sync_cmd;
|
|
volatile u64 sem = 0;
|
|
int ret;
|
|
|
|
build_completion_wait(&sync_cmd, (u64)&sem);
|
|
copy_cmd_to_buffer(iommu, &sync_cmd, tail);
|
|
|
|
spin_unlock_irqrestore(&iommu->lock, flags);
|
|
|
|
if ((ret = wait_on_sem(&sem)) != 0)
|
|
return ret;
|
|
|
|
goto again;
|
|
}
|
|
|
|
copy_cmd_to_buffer(iommu, cmd, tail);
|
|
|
|
/* We need to sync now to make sure all commands are processed */
|
|
iommu->need_sync = sync;
|
|
|
|
spin_unlock_irqrestore(&iommu->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd)
|
|
{
|
|
return iommu_queue_command_sync(iommu, cmd, true);
|
|
}
|
|
|
|
/*
|
|
* This function queues a completion wait command into the command
|
|
* buffer of an IOMMU
|
|
*/
|
|
static int iommu_completion_wait(struct amd_iommu *iommu)
|
|
{
|
|
struct iommu_cmd cmd;
|
|
volatile u64 sem = 0;
|
|
int ret;
|
|
|
|
if (!iommu->need_sync)
|
|
return 0;
|
|
|
|
build_completion_wait(&cmd, (u64)&sem);
|
|
|
|
ret = iommu_queue_command_sync(iommu, &cmd, false);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return wait_on_sem(&sem);
|
|
}
|
|
|
|
static int iommu_flush_dte(struct amd_iommu *iommu, u16 devid)
|
|
{
|
|
struct iommu_cmd cmd;
|
|
|
|
build_inv_dte(&cmd, devid);
|
|
|
|
return iommu_queue_command(iommu, &cmd);
|
|
}
|
|
|
|
static void iommu_flush_dte_all(struct amd_iommu *iommu)
|
|
{
|
|
u32 devid;
|
|
|
|
for (devid = 0; devid <= 0xffff; ++devid)
|
|
iommu_flush_dte(iommu, devid);
|
|
|
|
iommu_completion_wait(iommu);
|
|
}
|
|
|
|
/*
|
|
* This function uses heavy locking and may disable irqs for some time. But
|
|
* this is no issue because it is only called during resume.
|
|
*/
|
|
static void iommu_flush_tlb_all(struct amd_iommu *iommu)
|
|
{
|
|
u32 dom_id;
|
|
|
|
for (dom_id = 0; dom_id <= 0xffff; ++dom_id) {
|
|
struct iommu_cmd cmd;
|
|
build_inv_iommu_pages(&cmd, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS,
|
|
dom_id, 1);
|
|
iommu_queue_command(iommu, &cmd);
|
|
}
|
|
|
|
iommu_completion_wait(iommu);
|
|
}
|
|
|
|
static void iommu_flush_all(struct amd_iommu *iommu)
|
|
{
|
|
struct iommu_cmd cmd;
|
|
|
|
build_inv_all(&cmd);
|
|
|
|
iommu_queue_command(iommu, &cmd);
|
|
iommu_completion_wait(iommu);
|
|
}
|
|
|
|
void iommu_flush_all_caches(struct amd_iommu *iommu)
|
|
{
|
|
if (iommu_feature(iommu, FEATURE_IA)) {
|
|
iommu_flush_all(iommu);
|
|
} else {
|
|
iommu_flush_dte_all(iommu);
|
|
iommu_flush_tlb_all(iommu);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Command send function for flushing on-device TLB
|
|
*/
|
|
static int device_flush_iotlb(struct iommu_dev_data *dev_data,
|
|
u64 address, size_t size)
|
|
{
|
|
struct amd_iommu *iommu;
|
|
struct iommu_cmd cmd;
|
|
int qdep;
|
|
|
|
qdep = dev_data->ats.qdep;
|
|
iommu = amd_iommu_rlookup_table[dev_data->devid];
|
|
|
|
build_inv_iotlb_pages(&cmd, dev_data->devid, qdep, address, size);
|
|
|
|
return iommu_queue_command(iommu, &cmd);
|
|
}
|
|
|
|
/*
|
|
* Command send function for invalidating a device table entry
|
|
*/
|
|
static int device_flush_dte(struct iommu_dev_data *dev_data)
|
|
{
|
|
struct amd_iommu *iommu;
|
|
int ret;
|
|
|
|
iommu = amd_iommu_rlookup_table[dev_data->devid];
|
|
|
|
ret = iommu_flush_dte(iommu, dev_data->devid);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (dev_data->ats.enabled)
|
|
ret = device_flush_iotlb(dev_data, 0, ~0UL);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* TLB invalidation function which is called from the mapping functions.
|
|
* It invalidates a single PTE if the range to flush is within a single
|
|
* page. Otherwise it flushes the whole TLB of the IOMMU.
|
|
*/
|
|
static void __domain_flush_pages(struct protection_domain *domain,
|
|
u64 address, size_t size, int pde)
|
|
{
|
|
struct iommu_dev_data *dev_data;
|
|
struct iommu_cmd cmd;
|
|
int ret = 0, i;
|
|
|
|
build_inv_iommu_pages(&cmd, address, size, domain->id, pde);
|
|
|
|
for (i = 0; i < amd_iommus_present; ++i) {
|
|
if (!domain->dev_iommu[i])
|
|
continue;
|
|
|
|
/*
|
|
* Devices of this domain are behind this IOMMU
|
|
* We need a TLB flush
|
|
*/
|
|
ret |= iommu_queue_command(amd_iommus[i], &cmd);
|
|
}
|
|
|
|
list_for_each_entry(dev_data, &domain->dev_list, list) {
|
|
|
|
if (!dev_data->ats.enabled)
|
|
continue;
|
|
|
|
ret |= device_flush_iotlb(dev_data, address, size);
|
|
}
|
|
|
|
WARN_ON(ret);
|
|
}
|
|
|
|
static void domain_flush_pages(struct protection_domain *domain,
|
|
u64 address, size_t size)
|
|
{
|
|
__domain_flush_pages(domain, address, size, 0);
|
|
}
|
|
|
|
/* Flush the whole IO/TLB for a given protection domain */
|
|
static void domain_flush_tlb(struct protection_domain *domain)
|
|
{
|
|
__domain_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 0);
|
|
}
|
|
|
|
/* Flush the whole IO/TLB for a given protection domain - including PDE */
|
|
static void domain_flush_tlb_pde(struct protection_domain *domain)
|
|
{
|
|
__domain_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 1);
|
|
}
|
|
|
|
static void domain_flush_complete(struct protection_domain *domain)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < amd_iommus_present; ++i) {
|
|
if (!domain->dev_iommu[i])
|
|
continue;
|
|
|
|
/*
|
|
* Devices of this domain are behind this IOMMU
|
|
* We need to wait for completion of all commands.
|
|
*/
|
|
iommu_completion_wait(amd_iommus[i]);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* This function flushes the DTEs for all devices in domain
|
|
*/
|
|
static void domain_flush_devices(struct protection_domain *domain)
|
|
{
|
|
struct iommu_dev_data *dev_data;
|
|
|
|
list_for_each_entry(dev_data, &domain->dev_list, list)
|
|
device_flush_dte(dev_data);
|
|
}
|
|
|
|
/****************************************************************************
|
|
*
|
|
* The functions below are used the create the page table mappings for
|
|
* unity mapped regions.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/*
|
|
* This function is used to add another level to an IO page table. Adding
|
|
* another level increases the size of the address space by 9 bits to a size up
|
|
* to 64 bits.
|
|
*/
|
|
static bool increase_address_space(struct protection_domain *domain,
|
|
gfp_t gfp)
|
|
{
|
|
u64 *pte;
|
|
|
|
if (domain->mode == PAGE_MODE_6_LEVEL)
|
|
/* address space already 64 bit large */
|
|
return false;
|
|
|
|
pte = (void *)get_zeroed_page(gfp);
|
|
if (!pte)
|
|
return false;
|
|
|
|
*pte = PM_LEVEL_PDE(domain->mode,
|
|
virt_to_phys(domain->pt_root));
|
|
domain->pt_root = pte;
|
|
domain->mode += 1;
|
|
domain->updated = true;
|
|
|
|
return true;
|
|
}
|
|
|
|
static u64 *alloc_pte(struct protection_domain *domain,
|
|
unsigned long address,
|
|
unsigned long page_size,
|
|
u64 **pte_page,
|
|
gfp_t gfp)
|
|
{
|
|
int level, end_lvl;
|
|
u64 *pte, *page;
|
|
|
|
BUG_ON(!is_power_of_2(page_size));
|
|
|
|
while (address > PM_LEVEL_SIZE(domain->mode))
|
|
increase_address_space(domain, gfp);
|
|
|
|
level = domain->mode - 1;
|
|
pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
|
|
address = PAGE_SIZE_ALIGN(address, page_size);
|
|
end_lvl = PAGE_SIZE_LEVEL(page_size);
|
|
|
|
while (level > end_lvl) {
|
|
if (!IOMMU_PTE_PRESENT(*pte)) {
|
|
page = (u64 *)get_zeroed_page(gfp);
|
|
if (!page)
|
|
return NULL;
|
|
*pte = PM_LEVEL_PDE(level, virt_to_phys(page));
|
|
}
|
|
|
|
/* No level skipping support yet */
|
|
if (PM_PTE_LEVEL(*pte) != level)
|
|
return NULL;
|
|
|
|
level -= 1;
|
|
|
|
pte = IOMMU_PTE_PAGE(*pte);
|
|
|
|
if (pte_page && level == end_lvl)
|
|
*pte_page = pte;
|
|
|
|
pte = &pte[PM_LEVEL_INDEX(level, address)];
|
|
}
|
|
|
|
return pte;
|
|
}
|
|
|
|
/*
|
|
* This function checks if there is a PTE for a given dma address. If
|
|
* there is one, it returns the pointer to it.
|
|
*/
|
|
static u64 *fetch_pte(struct protection_domain *domain, unsigned long address)
|
|
{
|
|
int level;
|
|
u64 *pte;
|
|
|
|
if (address > PM_LEVEL_SIZE(domain->mode))
|
|
return NULL;
|
|
|
|
level = domain->mode - 1;
|
|
pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
|
|
|
|
while (level > 0) {
|
|
|
|
/* Not Present */
|
|
if (!IOMMU_PTE_PRESENT(*pte))
|
|
return NULL;
|
|
|
|
/* Large PTE */
|
|
if (PM_PTE_LEVEL(*pte) == 0x07) {
|
|
unsigned long pte_mask, __pte;
|
|
|
|
/*
|
|
* If we have a series of large PTEs, make
|
|
* sure to return a pointer to the first one.
|
|
*/
|
|
pte_mask = PTE_PAGE_SIZE(*pte);
|
|
pte_mask = ~((PAGE_SIZE_PTE_COUNT(pte_mask) << 3) - 1);
|
|
__pte = ((unsigned long)pte) & pte_mask;
|
|
|
|
return (u64 *)__pte;
|
|
}
|
|
|
|
/* No level skipping support yet */
|
|
if (PM_PTE_LEVEL(*pte) != level)
|
|
return NULL;
|
|
|
|
level -= 1;
|
|
|
|
/* Walk to the next level */
|
|
pte = IOMMU_PTE_PAGE(*pte);
|
|
pte = &pte[PM_LEVEL_INDEX(level, address)];
|
|
}
|
|
|
|
return pte;
|
|
}
|
|
|
|
/*
|
|
* Generic mapping functions. It maps a physical address into a DMA
|
|
* address space. It allocates the page table pages if necessary.
|
|
* In the future it can be extended to a generic mapping function
|
|
* supporting all features of AMD IOMMU page tables like level skipping
|
|
* and full 64 bit address spaces.
|
|
*/
|
|
static int iommu_map_page(struct protection_domain *dom,
|
|
unsigned long bus_addr,
|
|
unsigned long phys_addr,
|
|
int prot,
|
|
unsigned long page_size)
|
|
{
|
|
u64 __pte, *pte;
|
|
int i, count;
|
|
|
|
if (!(prot & IOMMU_PROT_MASK))
|
|
return -EINVAL;
|
|
|
|
bus_addr = PAGE_ALIGN(bus_addr);
|
|
phys_addr = PAGE_ALIGN(phys_addr);
|
|
count = PAGE_SIZE_PTE_COUNT(page_size);
|
|
pte = alloc_pte(dom, bus_addr, page_size, NULL, GFP_KERNEL);
|
|
|
|
for (i = 0; i < count; ++i)
|
|
if (IOMMU_PTE_PRESENT(pte[i]))
|
|
return -EBUSY;
|
|
|
|
if (page_size > PAGE_SIZE) {
|
|
__pte = PAGE_SIZE_PTE(phys_addr, page_size);
|
|
__pte |= PM_LEVEL_ENC(7) | IOMMU_PTE_P | IOMMU_PTE_FC;
|
|
} else
|
|
__pte = phys_addr | IOMMU_PTE_P | IOMMU_PTE_FC;
|
|
|
|
if (prot & IOMMU_PROT_IR)
|
|
__pte |= IOMMU_PTE_IR;
|
|
if (prot & IOMMU_PROT_IW)
|
|
__pte |= IOMMU_PTE_IW;
|
|
|
|
for (i = 0; i < count; ++i)
|
|
pte[i] = __pte;
|
|
|
|
update_domain(dom);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned long iommu_unmap_page(struct protection_domain *dom,
|
|
unsigned long bus_addr,
|
|
unsigned long page_size)
|
|
{
|
|
unsigned long long unmap_size, unmapped;
|
|
u64 *pte;
|
|
|
|
BUG_ON(!is_power_of_2(page_size));
|
|
|
|
unmapped = 0;
|
|
|
|
while (unmapped < page_size) {
|
|
|
|
pte = fetch_pte(dom, bus_addr);
|
|
|
|
if (!pte) {
|
|
/*
|
|
* No PTE for this address
|
|
* move forward in 4kb steps
|
|
*/
|
|
unmap_size = PAGE_SIZE;
|
|
} else if (PM_PTE_LEVEL(*pte) == 0) {
|
|
/* 4kb PTE found for this address */
|
|
unmap_size = PAGE_SIZE;
|
|
*pte = 0ULL;
|
|
} else {
|
|
int count, i;
|
|
|
|
/* Large PTE found which maps this address */
|
|
unmap_size = PTE_PAGE_SIZE(*pte);
|
|
count = PAGE_SIZE_PTE_COUNT(unmap_size);
|
|
for (i = 0; i < count; i++)
|
|
pte[i] = 0ULL;
|
|
}
|
|
|
|
bus_addr = (bus_addr & ~(unmap_size - 1)) + unmap_size;
|
|
unmapped += unmap_size;
|
|
}
|
|
|
|
BUG_ON(!is_power_of_2(unmapped));
|
|
|
|
return unmapped;
|
|
}
|
|
|
|
/*
|
|
* This function checks if a specific unity mapping entry is needed for
|
|
* this specific IOMMU.
|
|
*/
|
|
static int iommu_for_unity_map(struct amd_iommu *iommu,
|
|
struct unity_map_entry *entry)
|
|
{
|
|
u16 bdf, i;
|
|
|
|
for (i = entry->devid_start; i <= entry->devid_end; ++i) {
|
|
bdf = amd_iommu_alias_table[i];
|
|
if (amd_iommu_rlookup_table[bdf] == iommu)
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function actually applies the mapping to the page table of the
|
|
* dma_ops domain.
|
|
*/
|
|
static int dma_ops_unity_map(struct dma_ops_domain *dma_dom,
|
|
struct unity_map_entry *e)
|
|
{
|
|
u64 addr;
|
|
int ret;
|
|
|
|
for (addr = e->address_start; addr < e->address_end;
|
|
addr += PAGE_SIZE) {
|
|
ret = iommu_map_page(&dma_dom->domain, addr, addr, e->prot,
|
|
PAGE_SIZE);
|
|
if (ret)
|
|
return ret;
|
|
/*
|
|
* if unity mapping is in aperture range mark the page
|
|
* as allocated in the aperture
|
|
*/
|
|
if (addr < dma_dom->aperture_size)
|
|
__set_bit(addr >> PAGE_SHIFT,
|
|
dma_dom->aperture[0]->bitmap);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Init the unity mappings for a specific IOMMU in the system
|
|
*
|
|
* Basically iterates over all unity mapping entries and applies them to
|
|
* the default domain DMA of that IOMMU if necessary.
|
|
*/
|
|
static int iommu_init_unity_mappings(struct amd_iommu *iommu)
|
|
{
|
|
struct unity_map_entry *entry;
|
|
int ret;
|
|
|
|
list_for_each_entry(entry, &amd_iommu_unity_map, list) {
|
|
if (!iommu_for_unity_map(iommu, entry))
|
|
continue;
|
|
ret = dma_ops_unity_map(iommu->default_dom, entry);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Inits the unity mappings required for a specific device
|
|
*/
|
|
static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom,
|
|
u16 devid)
|
|
{
|
|
struct unity_map_entry *e;
|
|
int ret;
|
|
|
|
list_for_each_entry(e, &amd_iommu_unity_map, list) {
|
|
if (!(devid >= e->devid_start && devid <= e->devid_end))
|
|
continue;
|
|
ret = dma_ops_unity_map(dma_dom, e);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************
|
|
*
|
|
* The next functions belong to the address allocator for the dma_ops
|
|
* interface functions. They work like the allocators in the other IOMMU
|
|
* drivers. Its basically a bitmap which marks the allocated pages in
|
|
* the aperture. Maybe it could be enhanced in the future to a more
|
|
* efficient allocator.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/*
|
|
* The address allocator core functions.
|
|
*
|
|
* called with domain->lock held
|
|
*/
|
|
|
|
/*
|
|
* Used to reserve address ranges in the aperture (e.g. for exclusion
|
|
* ranges.
|
|
*/
|
|
static void dma_ops_reserve_addresses(struct dma_ops_domain *dom,
|
|
unsigned long start_page,
|
|
unsigned int pages)
|
|
{
|
|
unsigned int i, last_page = dom->aperture_size >> PAGE_SHIFT;
|
|
|
|
if (start_page + pages > last_page)
|
|
pages = last_page - start_page;
|
|
|
|
for (i = start_page; i < start_page + pages; ++i) {
|
|
int index = i / APERTURE_RANGE_PAGES;
|
|
int page = i % APERTURE_RANGE_PAGES;
|
|
__set_bit(page, dom->aperture[index]->bitmap);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This function is used to add a new aperture range to an existing
|
|
* aperture in case of dma_ops domain allocation or address allocation
|
|
* failure.
|
|
*/
|
|
static int alloc_new_range(struct dma_ops_domain *dma_dom,
|
|
bool populate, gfp_t gfp)
|
|
{
|
|
int index = dma_dom->aperture_size >> APERTURE_RANGE_SHIFT;
|
|
struct amd_iommu *iommu;
|
|
unsigned long i, old_size;
|
|
|
|
#ifdef CONFIG_IOMMU_STRESS
|
|
populate = false;
|
|
#endif
|
|
|
|
if (index >= APERTURE_MAX_RANGES)
|
|
return -ENOMEM;
|
|
|
|
dma_dom->aperture[index] = kzalloc(sizeof(struct aperture_range), gfp);
|
|
if (!dma_dom->aperture[index])
|
|
return -ENOMEM;
|
|
|
|
dma_dom->aperture[index]->bitmap = (void *)get_zeroed_page(gfp);
|
|
if (!dma_dom->aperture[index]->bitmap)
|
|
goto out_free;
|
|
|
|
dma_dom->aperture[index]->offset = dma_dom->aperture_size;
|
|
|
|
if (populate) {
|
|
unsigned long address = dma_dom->aperture_size;
|
|
int i, num_ptes = APERTURE_RANGE_PAGES / 512;
|
|
u64 *pte, *pte_page;
|
|
|
|
for (i = 0; i < num_ptes; ++i) {
|
|
pte = alloc_pte(&dma_dom->domain, address, PAGE_SIZE,
|
|
&pte_page, gfp);
|
|
if (!pte)
|
|
goto out_free;
|
|
|
|
dma_dom->aperture[index]->pte_pages[i] = pte_page;
|
|
|
|
address += APERTURE_RANGE_SIZE / 64;
|
|
}
|
|
}
|
|
|
|
old_size = dma_dom->aperture_size;
|
|
dma_dom->aperture_size += APERTURE_RANGE_SIZE;
|
|
|
|
/* Reserve address range used for MSI messages */
|
|
if (old_size < MSI_ADDR_BASE_LO &&
|
|
dma_dom->aperture_size > MSI_ADDR_BASE_LO) {
|
|
unsigned long spage;
|
|
int pages;
|
|
|
|
pages = iommu_num_pages(MSI_ADDR_BASE_LO, 0x10000, PAGE_SIZE);
|
|
spage = MSI_ADDR_BASE_LO >> PAGE_SHIFT;
|
|
|
|
dma_ops_reserve_addresses(dma_dom, spage, pages);
|
|
}
|
|
|
|
/* Initialize the exclusion range if necessary */
|
|
for_each_iommu(iommu) {
|
|
if (iommu->exclusion_start &&
|
|
iommu->exclusion_start >= dma_dom->aperture[index]->offset
|
|
&& iommu->exclusion_start < dma_dom->aperture_size) {
|
|
unsigned long startpage;
|
|
int pages = iommu_num_pages(iommu->exclusion_start,
|
|
iommu->exclusion_length,
|
|
PAGE_SIZE);
|
|
startpage = iommu->exclusion_start >> PAGE_SHIFT;
|
|
dma_ops_reserve_addresses(dma_dom, startpage, pages);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check for areas already mapped as present in the new aperture
|
|
* range and mark those pages as reserved in the allocator. Such
|
|
* mappings may already exist as a result of requested unity
|
|
* mappings for devices.
|
|
*/
|
|
for (i = dma_dom->aperture[index]->offset;
|
|
i < dma_dom->aperture_size;
|
|
i += PAGE_SIZE) {
|
|
u64 *pte = fetch_pte(&dma_dom->domain, i);
|
|
if (!pte || !IOMMU_PTE_PRESENT(*pte))
|
|
continue;
|
|
|
|
dma_ops_reserve_addresses(dma_dom, i >> PAGE_SHIFT, 1);
|
|
}
|
|
|
|
update_domain(&dma_dom->domain);
|
|
|
|
return 0;
|
|
|
|
out_free:
|
|
update_domain(&dma_dom->domain);
|
|
|
|
free_page((unsigned long)dma_dom->aperture[index]->bitmap);
|
|
|
|
kfree(dma_dom->aperture[index]);
|
|
dma_dom->aperture[index] = NULL;
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static unsigned long dma_ops_area_alloc(struct device *dev,
|
|
struct dma_ops_domain *dom,
|
|
unsigned int pages,
|
|
unsigned long align_mask,
|
|
u64 dma_mask,
|
|
unsigned long start)
|
|
{
|
|
unsigned long next_bit = dom->next_address % APERTURE_RANGE_SIZE;
|
|
int max_index = dom->aperture_size >> APERTURE_RANGE_SHIFT;
|
|
int i = start >> APERTURE_RANGE_SHIFT;
|
|
unsigned long boundary_size;
|
|
unsigned long address = -1;
|
|
unsigned long limit;
|
|
|
|
next_bit >>= PAGE_SHIFT;
|
|
|
|
boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
|
|
PAGE_SIZE) >> PAGE_SHIFT;
|
|
|
|
for (;i < max_index; ++i) {
|
|
unsigned long offset = dom->aperture[i]->offset >> PAGE_SHIFT;
|
|
|
|
if (dom->aperture[i]->offset >= dma_mask)
|
|
break;
|
|
|
|
limit = iommu_device_max_index(APERTURE_RANGE_PAGES, offset,
|
|
dma_mask >> PAGE_SHIFT);
|
|
|
|
address = iommu_area_alloc(dom->aperture[i]->bitmap,
|
|
limit, next_bit, pages, 0,
|
|
boundary_size, align_mask);
|
|
if (address != -1) {
|
|
address = dom->aperture[i]->offset +
|
|
(address << PAGE_SHIFT);
|
|
dom->next_address = address + (pages << PAGE_SHIFT);
|
|
break;
|
|
}
|
|
|
|
next_bit = 0;
|
|
}
|
|
|
|
return address;
|
|
}
|
|
|
|
static unsigned long dma_ops_alloc_addresses(struct device *dev,
|
|
struct dma_ops_domain *dom,
|
|
unsigned int pages,
|
|
unsigned long align_mask,
|
|
u64 dma_mask)
|
|
{
|
|
unsigned long address;
|
|
|
|
#ifdef CONFIG_IOMMU_STRESS
|
|
dom->next_address = 0;
|
|
dom->need_flush = true;
|
|
#endif
|
|
|
|
address = dma_ops_area_alloc(dev, dom, pages, align_mask,
|
|
dma_mask, dom->next_address);
|
|
|
|
if (address == -1) {
|
|
dom->next_address = 0;
|
|
address = dma_ops_area_alloc(dev, dom, pages, align_mask,
|
|
dma_mask, 0);
|
|
dom->need_flush = true;
|
|
}
|
|
|
|
if (unlikely(address == -1))
|
|
address = DMA_ERROR_CODE;
|
|
|
|
WARN_ON((address + (PAGE_SIZE*pages)) > dom->aperture_size);
|
|
|
|
return address;
|
|
}
|
|
|
|
/*
|
|
* The address free function.
|
|
*
|
|
* called with domain->lock held
|
|
*/
|
|
static void dma_ops_free_addresses(struct dma_ops_domain *dom,
|
|
unsigned long address,
|
|
unsigned int pages)
|
|
{
|
|
unsigned i = address >> APERTURE_RANGE_SHIFT;
|
|
struct aperture_range *range = dom->aperture[i];
|
|
|
|
BUG_ON(i >= APERTURE_MAX_RANGES || range == NULL);
|
|
|
|
#ifdef CONFIG_IOMMU_STRESS
|
|
if (i < 4)
|
|
return;
|
|
#endif
|
|
|
|
if (address >= dom->next_address)
|
|
dom->need_flush = true;
|
|
|
|
address = (address % APERTURE_RANGE_SIZE) >> PAGE_SHIFT;
|
|
|
|
bitmap_clear(range->bitmap, address, pages);
|
|
|
|
}
|
|
|
|
/****************************************************************************
|
|
*
|
|
* The next functions belong to the domain allocation. A domain is
|
|
* allocated for every IOMMU as the default domain. If device isolation
|
|
* is enabled, every device get its own domain. The most important thing
|
|
* about domains is the page table mapping the DMA address space they
|
|
* contain.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/*
|
|
* This function adds a protection domain to the global protection domain list
|
|
*/
|
|
static void add_domain_to_list(struct protection_domain *domain)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&amd_iommu_pd_lock, flags);
|
|
list_add(&domain->list, &amd_iommu_pd_list);
|
|
spin_unlock_irqrestore(&amd_iommu_pd_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* This function removes a protection domain to the global
|
|
* protection domain list
|
|
*/
|
|
static void del_domain_from_list(struct protection_domain *domain)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&amd_iommu_pd_lock, flags);
|
|
list_del(&domain->list);
|
|
spin_unlock_irqrestore(&amd_iommu_pd_lock, flags);
|
|
}
|
|
|
|
static u16 domain_id_alloc(void)
|
|
{
|
|
unsigned long flags;
|
|
int id;
|
|
|
|
write_lock_irqsave(&amd_iommu_devtable_lock, flags);
|
|
id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID);
|
|
BUG_ON(id == 0);
|
|
if (id > 0 && id < MAX_DOMAIN_ID)
|
|
__set_bit(id, amd_iommu_pd_alloc_bitmap);
|
|
else
|
|
id = 0;
|
|
write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
|
|
|
|
return id;
|
|
}
|
|
|
|
static void domain_id_free(int id)
|
|
{
|
|
unsigned long flags;
|
|
|
|
write_lock_irqsave(&amd_iommu_devtable_lock, flags);
|
|
if (id > 0 && id < MAX_DOMAIN_ID)
|
|
__clear_bit(id, amd_iommu_pd_alloc_bitmap);
|
|
write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
|
|
}
|
|
|
|
static void free_pagetable(struct protection_domain *domain)
|
|
{
|
|
int i, j;
|
|
u64 *p1, *p2, *p3;
|
|
|
|
p1 = domain->pt_root;
|
|
|
|
if (!p1)
|
|
return;
|
|
|
|
for (i = 0; i < 512; ++i) {
|
|
if (!IOMMU_PTE_PRESENT(p1[i]))
|
|
continue;
|
|
|
|
p2 = IOMMU_PTE_PAGE(p1[i]);
|
|
for (j = 0; j < 512; ++j) {
|
|
if (!IOMMU_PTE_PRESENT(p2[j]))
|
|
continue;
|
|
p3 = IOMMU_PTE_PAGE(p2[j]);
|
|
free_page((unsigned long)p3);
|
|
}
|
|
|
|
free_page((unsigned long)p2);
|
|
}
|
|
|
|
free_page((unsigned long)p1);
|
|
|
|
domain->pt_root = NULL;
|
|
}
|
|
|
|
static void free_gcr3_table(struct protection_domain *domain)
|
|
{
|
|
free_page((unsigned long)domain->gcr3_tbl);
|
|
}
|
|
|
|
/*
|
|
* Free a domain, only used if something went wrong in the
|
|
* allocation path and we need to free an already allocated page table
|
|
*/
|
|
static void dma_ops_domain_free(struct dma_ops_domain *dom)
|
|
{
|
|
int i;
|
|
|
|
if (!dom)
|
|
return;
|
|
|
|
del_domain_from_list(&dom->domain);
|
|
|
|
free_pagetable(&dom->domain);
|
|
|
|
for (i = 0; i < APERTURE_MAX_RANGES; ++i) {
|
|
if (!dom->aperture[i])
|
|
continue;
|
|
free_page((unsigned long)dom->aperture[i]->bitmap);
|
|
kfree(dom->aperture[i]);
|
|
}
|
|
|
|
kfree(dom);
|
|
}
|
|
|
|
/*
|
|
* Allocates a new protection domain usable for the dma_ops functions.
|
|
* It also initializes the page table and the address allocator data
|
|
* structures required for the dma_ops interface
|
|
*/
|
|
static struct dma_ops_domain *dma_ops_domain_alloc(void)
|
|
{
|
|
struct dma_ops_domain *dma_dom;
|
|
|
|
dma_dom = kzalloc(sizeof(struct dma_ops_domain), GFP_KERNEL);
|
|
if (!dma_dom)
|
|
return NULL;
|
|
|
|
spin_lock_init(&dma_dom->domain.lock);
|
|
|
|
dma_dom->domain.id = domain_id_alloc();
|
|
if (dma_dom->domain.id == 0)
|
|
goto free_dma_dom;
|
|
INIT_LIST_HEAD(&dma_dom->domain.dev_list);
|
|
dma_dom->domain.mode = PAGE_MODE_2_LEVEL;
|
|
dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL);
|
|
dma_dom->domain.flags = PD_DMA_OPS_MASK;
|
|
dma_dom->domain.priv = dma_dom;
|
|
if (!dma_dom->domain.pt_root)
|
|
goto free_dma_dom;
|
|
|
|
dma_dom->need_flush = false;
|
|
dma_dom->target_dev = 0xffff;
|
|
|
|
add_domain_to_list(&dma_dom->domain);
|
|
|
|
if (alloc_new_range(dma_dom, true, GFP_KERNEL))
|
|
goto free_dma_dom;
|
|
|
|
/*
|
|
* mark the first page as allocated so we never return 0 as
|
|
* a valid dma-address. So we can use 0 as error value
|
|
*/
|
|
dma_dom->aperture[0]->bitmap[0] = 1;
|
|
dma_dom->next_address = 0;
|
|
|
|
|
|
return dma_dom;
|
|
|
|
free_dma_dom:
|
|
dma_ops_domain_free(dma_dom);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* little helper function to check whether a given protection domain is a
|
|
* dma_ops domain
|
|
*/
|
|
static bool dma_ops_domain(struct protection_domain *domain)
|
|
{
|
|
return domain->flags & PD_DMA_OPS_MASK;
|
|
}
|
|
|
|
static void set_dte_entry(u16 devid, struct protection_domain *domain, bool ats)
|
|
{
|
|
u64 pte_root = 0;
|
|
u64 flags = 0;
|
|
|
|
if (domain->mode != PAGE_MODE_NONE)
|
|
pte_root = virt_to_phys(domain->pt_root);
|
|
|
|
pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK)
|
|
<< DEV_ENTRY_MODE_SHIFT;
|
|
pte_root |= IOMMU_PTE_IR | IOMMU_PTE_IW | IOMMU_PTE_P | IOMMU_PTE_TV;
|
|
|
|
flags = amd_iommu_dev_table[devid].data[1];
|
|
|
|
if (ats)
|
|
flags |= DTE_FLAG_IOTLB;
|
|
|
|
if (domain->flags & PD_IOMMUV2_MASK) {
|
|
u64 gcr3 = __pa(domain->gcr3_tbl);
|
|
u64 glx = domain->glx;
|
|
u64 tmp;
|
|
|
|
pte_root |= DTE_FLAG_GV;
|
|
pte_root |= (glx & DTE_GLX_MASK) << DTE_GLX_SHIFT;
|
|
|
|
/* First mask out possible old values for GCR3 table */
|
|
tmp = DTE_GCR3_VAL_B(~0ULL) << DTE_GCR3_SHIFT_B;
|
|
flags &= ~tmp;
|
|
|
|
tmp = DTE_GCR3_VAL_C(~0ULL) << DTE_GCR3_SHIFT_C;
|
|
flags &= ~tmp;
|
|
|
|
/* Encode GCR3 table into DTE */
|
|
tmp = DTE_GCR3_VAL_A(gcr3) << DTE_GCR3_SHIFT_A;
|
|
pte_root |= tmp;
|
|
|
|
tmp = DTE_GCR3_VAL_B(gcr3) << DTE_GCR3_SHIFT_B;
|
|
flags |= tmp;
|
|
|
|
tmp = DTE_GCR3_VAL_C(gcr3) << DTE_GCR3_SHIFT_C;
|
|
flags |= tmp;
|
|
}
|
|
|
|
flags &= ~(0xffffUL);
|
|
flags |= domain->id;
|
|
|
|
amd_iommu_dev_table[devid].data[1] = flags;
|
|
amd_iommu_dev_table[devid].data[0] = pte_root;
|
|
}
|
|
|
|
static void clear_dte_entry(u16 devid)
|
|
{
|
|
/* remove entry from the device table seen by the hardware */
|
|
amd_iommu_dev_table[devid].data[0] = IOMMU_PTE_P | IOMMU_PTE_TV;
|
|
amd_iommu_dev_table[devid].data[1] = 0;
|
|
|
|
amd_iommu_apply_erratum_63(devid);
|
|
}
|
|
|
|
static void do_attach(struct iommu_dev_data *dev_data,
|
|
struct protection_domain *domain)
|
|
{
|
|
struct amd_iommu *iommu;
|
|
bool ats;
|
|
|
|
iommu = amd_iommu_rlookup_table[dev_data->devid];
|
|
ats = dev_data->ats.enabled;
|
|
|
|
/* Update data structures */
|
|
dev_data->domain = domain;
|
|
list_add(&dev_data->list, &domain->dev_list);
|
|
set_dte_entry(dev_data->devid, domain, ats);
|
|
|
|
/* Do reference counting */
|
|
domain->dev_iommu[iommu->index] += 1;
|
|
domain->dev_cnt += 1;
|
|
|
|
/* Flush the DTE entry */
|
|
device_flush_dte(dev_data);
|
|
}
|
|
|
|
static void do_detach(struct iommu_dev_data *dev_data)
|
|
{
|
|
struct amd_iommu *iommu;
|
|
|
|
iommu = amd_iommu_rlookup_table[dev_data->devid];
|
|
|
|
/* decrease reference counters */
|
|
dev_data->domain->dev_iommu[iommu->index] -= 1;
|
|
dev_data->domain->dev_cnt -= 1;
|
|
|
|
/* Update data structures */
|
|
dev_data->domain = NULL;
|
|
list_del(&dev_data->list);
|
|
clear_dte_entry(dev_data->devid);
|
|
|
|
/* Flush the DTE entry */
|
|
device_flush_dte(dev_data);
|
|
}
|
|
|
|
/*
|
|
* If a device is not yet associated with a domain, this function does
|
|
* assigns it visible for the hardware
|
|
*/
|
|
static int __attach_device(struct iommu_dev_data *dev_data,
|
|
struct protection_domain *domain)
|
|
{
|
|
int ret;
|
|
|
|
/* lock domain */
|
|
spin_lock(&domain->lock);
|
|
|
|
if (dev_data->alias_data != NULL) {
|
|
struct iommu_dev_data *alias_data = dev_data->alias_data;
|
|
|
|
/* Some sanity checks */
|
|
ret = -EBUSY;
|
|
if (alias_data->domain != NULL &&
|
|
alias_data->domain != domain)
|
|
goto out_unlock;
|
|
|
|
if (dev_data->domain != NULL &&
|
|
dev_data->domain != domain)
|
|
goto out_unlock;
|
|
|
|
/* Do real assignment */
|
|
if (alias_data->domain == NULL)
|
|
do_attach(alias_data, domain);
|
|
|
|
atomic_inc(&alias_data->bind);
|
|
}
|
|
|
|
if (dev_data->domain == NULL)
|
|
do_attach(dev_data, domain);
|
|
|
|
atomic_inc(&dev_data->bind);
|
|
|
|
ret = 0;
|
|
|
|
out_unlock:
|
|
|
|
/* ready */
|
|
spin_unlock(&domain->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static void pdev_iommuv2_disable(struct pci_dev *pdev)
|
|
{
|
|
pci_disable_ats(pdev);
|
|
pci_disable_pri(pdev);
|
|
pci_disable_pasid(pdev);
|
|
}
|
|
|
|
static int pdev_iommuv2_enable(struct pci_dev *pdev)
|
|
{
|
|
int ret;
|
|
|
|
/* Only allow access to user-accessible pages */
|
|
ret = pci_enable_pasid(pdev, 0);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
/* First reset the PRI state of the device */
|
|
ret = pci_reset_pri(pdev);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
/* FIXME: Hardcode number of outstanding requests for now */
|
|
ret = pci_enable_pri(pdev, 32);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
ret = pci_enable_ats(pdev, PAGE_SHIFT);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
pci_disable_pri(pdev);
|
|
pci_disable_pasid(pdev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* If a device is not yet associated with a domain, this function does
|
|
* assigns it visible for the hardware
|
|
*/
|
|
static int attach_device(struct device *dev,
|
|
struct protection_domain *domain)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
struct iommu_dev_data *dev_data;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
dev_data = get_dev_data(dev);
|
|
|
|
if (domain->flags & PD_IOMMUV2_MASK) {
|
|
if (!dev_data->iommu_v2 || !dev_data->passthrough)
|
|
return -EINVAL;
|
|
|
|
if (pdev_iommuv2_enable(pdev) != 0)
|
|
return -EINVAL;
|
|
|
|
dev_data->ats.enabled = true;
|
|
dev_data->ats.qdep = pci_ats_queue_depth(pdev);
|
|
} else if (amd_iommu_iotlb_sup &&
|
|
pci_enable_ats(pdev, PAGE_SHIFT) == 0) {
|
|
dev_data->ats.enabled = true;
|
|
dev_data->ats.qdep = pci_ats_queue_depth(pdev);
|
|
}
|
|
|
|
write_lock_irqsave(&amd_iommu_devtable_lock, flags);
|
|
ret = __attach_device(dev_data, domain);
|
|
write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
|
|
|
|
/*
|
|
* We might boot into a crash-kernel here. The crashed kernel
|
|
* left the caches in the IOMMU dirty. So we have to flush
|
|
* here to evict all dirty stuff.
|
|
*/
|
|
domain_flush_tlb_pde(domain);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Removes a device from a protection domain (unlocked)
|
|
*/
|
|
static void __detach_device(struct iommu_dev_data *dev_data)
|
|
{
|
|
struct protection_domain *domain;
|
|
unsigned long flags;
|
|
|
|
BUG_ON(!dev_data->domain);
|
|
|
|
domain = dev_data->domain;
|
|
|
|
spin_lock_irqsave(&domain->lock, flags);
|
|
|
|
if (dev_data->alias_data != NULL) {
|
|
struct iommu_dev_data *alias_data = dev_data->alias_data;
|
|
|
|
if (atomic_dec_and_test(&alias_data->bind))
|
|
do_detach(alias_data);
|
|
}
|
|
|
|
if (atomic_dec_and_test(&dev_data->bind))
|
|
do_detach(dev_data);
|
|
|
|
spin_unlock_irqrestore(&domain->lock, flags);
|
|
|
|
/*
|
|
* If we run in passthrough mode the device must be assigned to the
|
|
* passthrough domain if it is detached from any other domain.
|
|
* Make sure we can deassign from the pt_domain itself.
|
|
*/
|
|
if (dev_data->passthrough &&
|
|
(dev_data->domain == NULL && domain != pt_domain))
|
|
__attach_device(dev_data, pt_domain);
|
|
}
|
|
|
|
/*
|
|
* Removes a device from a protection domain (with devtable_lock held)
|
|
*/
|
|
static void detach_device(struct device *dev)
|
|
{
|
|
struct protection_domain *domain;
|
|
struct iommu_dev_data *dev_data;
|
|
unsigned long flags;
|
|
|
|
dev_data = get_dev_data(dev);
|
|
domain = dev_data->domain;
|
|
|
|
/* lock device table */
|
|
write_lock_irqsave(&amd_iommu_devtable_lock, flags);
|
|
__detach_device(dev_data);
|
|
write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
|
|
|
|
if (domain->flags & PD_IOMMUV2_MASK)
|
|
pdev_iommuv2_disable(to_pci_dev(dev));
|
|
else if (dev_data->ats.enabled)
|
|
pci_disable_ats(to_pci_dev(dev));
|
|
|
|
dev_data->ats.enabled = false;
|
|
}
|
|
|
|
/*
|
|
* Find out the protection domain structure for a given PCI device. This
|
|
* will give us the pointer to the page table root for example.
|
|
*/
|
|
static struct protection_domain *domain_for_device(struct device *dev)
|
|
{
|
|
struct iommu_dev_data *dev_data;
|
|
struct protection_domain *dom = NULL;
|
|
unsigned long flags;
|
|
|
|
dev_data = get_dev_data(dev);
|
|
|
|
if (dev_data->domain)
|
|
return dev_data->domain;
|
|
|
|
if (dev_data->alias_data != NULL) {
|
|
struct iommu_dev_data *alias_data = dev_data->alias_data;
|
|
|
|
read_lock_irqsave(&amd_iommu_devtable_lock, flags);
|
|
if (alias_data->domain != NULL) {
|
|
__attach_device(dev_data, alias_data->domain);
|
|
dom = alias_data->domain;
|
|
}
|
|
read_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
|
|
}
|
|
|
|
return dom;
|
|
}
|
|
|
|
static int device_change_notifier(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
struct dma_ops_domain *dma_domain;
|
|
struct protection_domain *domain;
|
|
struct iommu_dev_data *dev_data;
|
|
struct device *dev = data;
|
|
struct amd_iommu *iommu;
|
|
unsigned long flags;
|
|
u16 devid;
|
|
|
|
if (!check_device(dev))
|
|
return 0;
|
|
|
|
devid = get_device_id(dev);
|
|
iommu = amd_iommu_rlookup_table[devid];
|
|
dev_data = get_dev_data(dev);
|
|
|
|
switch (action) {
|
|
case BUS_NOTIFY_UNBOUND_DRIVER:
|
|
|
|
domain = domain_for_device(dev);
|
|
|
|
if (!domain)
|
|
goto out;
|
|
if (dev_data->passthrough)
|
|
break;
|
|
detach_device(dev);
|
|
break;
|
|
case BUS_NOTIFY_ADD_DEVICE:
|
|
|
|
iommu_init_device(dev);
|
|
|
|
domain = domain_for_device(dev);
|
|
|
|
/* allocate a protection domain if a device is added */
|
|
dma_domain = find_protection_domain(devid);
|
|
if (dma_domain)
|
|
goto out;
|
|
dma_domain = dma_ops_domain_alloc();
|
|
if (!dma_domain)
|
|
goto out;
|
|
dma_domain->target_dev = devid;
|
|
|
|
spin_lock_irqsave(&iommu_pd_list_lock, flags);
|
|
list_add_tail(&dma_domain->list, &iommu_pd_list);
|
|
spin_unlock_irqrestore(&iommu_pd_list_lock, flags);
|
|
|
|
break;
|
|
case BUS_NOTIFY_DEL_DEVICE:
|
|
|
|
iommu_uninit_device(dev);
|
|
|
|
default:
|
|
goto out;
|
|
}
|
|
|
|
iommu_completion_wait(iommu);
|
|
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block device_nb = {
|
|
.notifier_call = device_change_notifier,
|
|
};
|
|
|
|
void amd_iommu_init_notifier(void)
|
|
{
|
|
bus_register_notifier(&pci_bus_type, &device_nb);
|
|
}
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* The next functions belong to the dma_ops mapping/unmapping code.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* In the dma_ops path we only have the struct device. This function
|
|
* finds the corresponding IOMMU, the protection domain and the
|
|
* requestor id for a given device.
|
|
* If the device is not yet associated with a domain this is also done
|
|
* in this function.
|
|
*/
|
|
static struct protection_domain *get_domain(struct device *dev)
|
|
{
|
|
struct protection_domain *domain;
|
|
struct dma_ops_domain *dma_dom;
|
|
u16 devid = get_device_id(dev);
|
|
|
|
if (!check_device(dev))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
domain = domain_for_device(dev);
|
|
if (domain != NULL && !dma_ops_domain(domain))
|
|
return ERR_PTR(-EBUSY);
|
|
|
|
if (domain != NULL)
|
|
return domain;
|
|
|
|
/* Device not bount yet - bind it */
|
|
dma_dom = find_protection_domain(devid);
|
|
if (!dma_dom)
|
|
dma_dom = amd_iommu_rlookup_table[devid]->default_dom;
|
|
attach_device(dev, &dma_dom->domain);
|
|
DUMP_printk("Using protection domain %d for device %s\n",
|
|
dma_dom->domain.id, dev_name(dev));
|
|
|
|
return &dma_dom->domain;
|
|
}
|
|
|
|
static void update_device_table(struct protection_domain *domain)
|
|
{
|
|
struct iommu_dev_data *dev_data;
|
|
|
|
list_for_each_entry(dev_data, &domain->dev_list, list)
|
|
set_dte_entry(dev_data->devid, domain, dev_data->ats.enabled);
|
|
}
|
|
|
|
static void update_domain(struct protection_domain *domain)
|
|
{
|
|
if (!domain->updated)
|
|
return;
|
|
|
|
update_device_table(domain);
|
|
|
|
domain_flush_devices(domain);
|
|
domain_flush_tlb_pde(domain);
|
|
|
|
domain->updated = false;
|
|
}
|
|
|
|
/*
|
|
* This function fetches the PTE for a given address in the aperture
|
|
*/
|
|
static u64* dma_ops_get_pte(struct dma_ops_domain *dom,
|
|
unsigned long address)
|
|
{
|
|
struct aperture_range *aperture;
|
|
u64 *pte, *pte_page;
|
|
|
|
aperture = dom->aperture[APERTURE_RANGE_INDEX(address)];
|
|
if (!aperture)
|
|
return NULL;
|
|
|
|
pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)];
|
|
if (!pte) {
|
|
pte = alloc_pte(&dom->domain, address, PAGE_SIZE, &pte_page,
|
|
GFP_ATOMIC);
|
|
aperture->pte_pages[APERTURE_PAGE_INDEX(address)] = pte_page;
|
|
} else
|
|
pte += PM_LEVEL_INDEX(0, address);
|
|
|
|
update_domain(&dom->domain);
|
|
|
|
return pte;
|
|
}
|
|
|
|
/*
|
|
* This is the generic map function. It maps one 4kb page at paddr to
|
|
* the given address in the DMA address space for the domain.
|
|
*/
|
|
static dma_addr_t dma_ops_domain_map(struct dma_ops_domain *dom,
|
|
unsigned long address,
|
|
phys_addr_t paddr,
|
|
int direction)
|
|
{
|
|
u64 *pte, __pte;
|
|
|
|
WARN_ON(address > dom->aperture_size);
|
|
|
|
paddr &= PAGE_MASK;
|
|
|
|
pte = dma_ops_get_pte(dom, address);
|
|
if (!pte)
|
|
return DMA_ERROR_CODE;
|
|
|
|
__pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC;
|
|
|
|
if (direction == DMA_TO_DEVICE)
|
|
__pte |= IOMMU_PTE_IR;
|
|
else if (direction == DMA_FROM_DEVICE)
|
|
__pte |= IOMMU_PTE_IW;
|
|
else if (direction == DMA_BIDIRECTIONAL)
|
|
__pte |= IOMMU_PTE_IR | IOMMU_PTE_IW;
|
|
|
|
WARN_ON(*pte);
|
|
|
|
*pte = __pte;
|
|
|
|
return (dma_addr_t)address;
|
|
}
|
|
|
|
/*
|
|
* The generic unmapping function for on page in the DMA address space.
|
|
*/
|
|
static void dma_ops_domain_unmap(struct dma_ops_domain *dom,
|
|
unsigned long address)
|
|
{
|
|
struct aperture_range *aperture;
|
|
u64 *pte;
|
|
|
|
if (address >= dom->aperture_size)
|
|
return;
|
|
|
|
aperture = dom->aperture[APERTURE_RANGE_INDEX(address)];
|
|
if (!aperture)
|
|
return;
|
|
|
|
pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)];
|
|
if (!pte)
|
|
return;
|
|
|
|
pte += PM_LEVEL_INDEX(0, address);
|
|
|
|
WARN_ON(!*pte);
|
|
|
|
*pte = 0ULL;
|
|
}
|
|
|
|
/*
|
|
* This function contains common code for mapping of a physically
|
|
* contiguous memory region into DMA address space. It is used by all
|
|
* mapping functions provided with this IOMMU driver.
|
|
* Must be called with the domain lock held.
|
|
*/
|
|
static dma_addr_t __map_single(struct device *dev,
|
|
struct dma_ops_domain *dma_dom,
|
|
phys_addr_t paddr,
|
|
size_t size,
|
|
int dir,
|
|
bool align,
|
|
u64 dma_mask)
|
|
{
|
|
dma_addr_t offset = paddr & ~PAGE_MASK;
|
|
dma_addr_t address, start, ret;
|
|
unsigned int pages;
|
|
unsigned long align_mask = 0;
|
|
int i;
|
|
|
|
pages = iommu_num_pages(paddr, size, PAGE_SIZE);
|
|
paddr &= PAGE_MASK;
|
|
|
|
INC_STATS_COUNTER(total_map_requests);
|
|
|
|
if (pages > 1)
|
|
INC_STATS_COUNTER(cross_page);
|
|
|
|
if (align)
|
|
align_mask = (1UL << get_order(size)) - 1;
|
|
|
|
retry:
|
|
address = dma_ops_alloc_addresses(dev, dma_dom, pages, align_mask,
|
|
dma_mask);
|
|
if (unlikely(address == DMA_ERROR_CODE)) {
|
|
/*
|
|
* setting next_address here will let the address
|
|
* allocator only scan the new allocated range in the
|
|
* first run. This is a small optimization.
|
|
*/
|
|
dma_dom->next_address = dma_dom->aperture_size;
|
|
|
|
if (alloc_new_range(dma_dom, false, GFP_ATOMIC))
|
|
goto out;
|
|
|
|
/*
|
|
* aperture was successfully enlarged by 128 MB, try
|
|
* allocation again
|
|
*/
|
|
goto retry;
|
|
}
|
|
|
|
start = address;
|
|
for (i = 0; i < pages; ++i) {
|
|
ret = dma_ops_domain_map(dma_dom, start, paddr, dir);
|
|
if (ret == DMA_ERROR_CODE)
|
|
goto out_unmap;
|
|
|
|
paddr += PAGE_SIZE;
|
|
start += PAGE_SIZE;
|
|
}
|
|
address += offset;
|
|
|
|
ADD_STATS_COUNTER(alloced_io_mem, size);
|
|
|
|
if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) {
|
|
domain_flush_tlb(&dma_dom->domain);
|
|
dma_dom->need_flush = false;
|
|
} else if (unlikely(amd_iommu_np_cache))
|
|
domain_flush_pages(&dma_dom->domain, address, size);
|
|
|
|
out:
|
|
return address;
|
|
|
|
out_unmap:
|
|
|
|
for (--i; i >= 0; --i) {
|
|
start -= PAGE_SIZE;
|
|
dma_ops_domain_unmap(dma_dom, start);
|
|
}
|
|
|
|
dma_ops_free_addresses(dma_dom, address, pages);
|
|
|
|
return DMA_ERROR_CODE;
|
|
}
|
|
|
|
/*
|
|
* Does the reverse of the __map_single function. Must be called with
|
|
* the domain lock held too
|
|
*/
|
|
static void __unmap_single(struct dma_ops_domain *dma_dom,
|
|
dma_addr_t dma_addr,
|
|
size_t size,
|
|
int dir)
|
|
{
|
|
dma_addr_t flush_addr;
|
|
dma_addr_t i, start;
|
|
unsigned int pages;
|
|
|
|
if ((dma_addr == DMA_ERROR_CODE) ||
|
|
(dma_addr + size > dma_dom->aperture_size))
|
|
return;
|
|
|
|
flush_addr = dma_addr;
|
|
pages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
|
|
dma_addr &= PAGE_MASK;
|
|
start = dma_addr;
|
|
|
|
for (i = 0; i < pages; ++i) {
|
|
dma_ops_domain_unmap(dma_dom, start);
|
|
start += PAGE_SIZE;
|
|
}
|
|
|
|
SUB_STATS_COUNTER(alloced_io_mem, size);
|
|
|
|
dma_ops_free_addresses(dma_dom, dma_addr, pages);
|
|
|
|
if (amd_iommu_unmap_flush || dma_dom->need_flush) {
|
|
domain_flush_pages(&dma_dom->domain, flush_addr, size);
|
|
dma_dom->need_flush = false;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The exported map_single function for dma_ops.
|
|
*/
|
|
static dma_addr_t map_page(struct device *dev, struct page *page,
|
|
unsigned long offset, size_t size,
|
|
enum dma_data_direction dir,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
unsigned long flags;
|
|
struct protection_domain *domain;
|
|
dma_addr_t addr;
|
|
u64 dma_mask;
|
|
phys_addr_t paddr = page_to_phys(page) + offset;
|
|
|
|
INC_STATS_COUNTER(cnt_map_single);
|
|
|
|
domain = get_domain(dev);
|
|
if (PTR_ERR(domain) == -EINVAL)
|
|
return (dma_addr_t)paddr;
|
|
else if (IS_ERR(domain))
|
|
return DMA_ERROR_CODE;
|
|
|
|
dma_mask = *dev->dma_mask;
|
|
|
|
spin_lock_irqsave(&domain->lock, flags);
|
|
|
|
addr = __map_single(dev, domain->priv, paddr, size, dir, false,
|
|
dma_mask);
|
|
if (addr == DMA_ERROR_CODE)
|
|
goto out;
|
|
|
|
domain_flush_complete(domain);
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&domain->lock, flags);
|
|
|
|
return addr;
|
|
}
|
|
|
|
/*
|
|
* The exported unmap_single function for dma_ops.
|
|
*/
|
|
static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
|
|
enum dma_data_direction dir, struct dma_attrs *attrs)
|
|
{
|
|
unsigned long flags;
|
|
struct protection_domain *domain;
|
|
|
|
INC_STATS_COUNTER(cnt_unmap_single);
|
|
|
|
domain = get_domain(dev);
|
|
if (IS_ERR(domain))
|
|
return;
|
|
|
|
spin_lock_irqsave(&domain->lock, flags);
|
|
|
|
__unmap_single(domain->priv, dma_addr, size, dir);
|
|
|
|
domain_flush_complete(domain);
|
|
|
|
spin_unlock_irqrestore(&domain->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* This is a special map_sg function which is used if we should map a
|
|
* device which is not handled by an AMD IOMMU in the system.
|
|
*/
|
|
static int map_sg_no_iommu(struct device *dev, struct scatterlist *sglist,
|
|
int nelems, int dir)
|
|
{
|
|
struct scatterlist *s;
|
|
int i;
|
|
|
|
for_each_sg(sglist, s, nelems, i) {
|
|
s->dma_address = (dma_addr_t)sg_phys(s);
|
|
s->dma_length = s->length;
|
|
}
|
|
|
|
return nelems;
|
|
}
|
|
|
|
/*
|
|
* The exported map_sg function for dma_ops (handles scatter-gather
|
|
* lists).
|
|
*/
|
|
static int map_sg(struct device *dev, struct scatterlist *sglist,
|
|
int nelems, enum dma_data_direction dir,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
unsigned long flags;
|
|
struct protection_domain *domain;
|
|
int i;
|
|
struct scatterlist *s;
|
|
phys_addr_t paddr;
|
|
int mapped_elems = 0;
|
|
u64 dma_mask;
|
|
|
|
INC_STATS_COUNTER(cnt_map_sg);
|
|
|
|
domain = get_domain(dev);
|
|
if (PTR_ERR(domain) == -EINVAL)
|
|
return map_sg_no_iommu(dev, sglist, nelems, dir);
|
|
else if (IS_ERR(domain))
|
|
return 0;
|
|
|
|
dma_mask = *dev->dma_mask;
|
|
|
|
spin_lock_irqsave(&domain->lock, flags);
|
|
|
|
for_each_sg(sglist, s, nelems, i) {
|
|
paddr = sg_phys(s);
|
|
|
|
s->dma_address = __map_single(dev, domain->priv,
|
|
paddr, s->length, dir, false,
|
|
dma_mask);
|
|
|
|
if (s->dma_address) {
|
|
s->dma_length = s->length;
|
|
mapped_elems++;
|
|
} else
|
|
goto unmap;
|
|
}
|
|
|
|
domain_flush_complete(domain);
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&domain->lock, flags);
|
|
|
|
return mapped_elems;
|
|
unmap:
|
|
for_each_sg(sglist, s, mapped_elems, i) {
|
|
if (s->dma_address)
|
|
__unmap_single(domain->priv, s->dma_address,
|
|
s->dma_length, dir);
|
|
s->dma_address = s->dma_length = 0;
|
|
}
|
|
|
|
mapped_elems = 0;
|
|
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* The exported map_sg function for dma_ops (handles scatter-gather
|
|
* lists).
|
|
*/
|
|
static void unmap_sg(struct device *dev, struct scatterlist *sglist,
|
|
int nelems, enum dma_data_direction dir,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
unsigned long flags;
|
|
struct protection_domain *domain;
|
|
struct scatterlist *s;
|
|
int i;
|
|
|
|
INC_STATS_COUNTER(cnt_unmap_sg);
|
|
|
|
domain = get_domain(dev);
|
|
if (IS_ERR(domain))
|
|
return;
|
|
|
|
spin_lock_irqsave(&domain->lock, flags);
|
|
|
|
for_each_sg(sglist, s, nelems, i) {
|
|
__unmap_single(domain->priv, s->dma_address,
|
|
s->dma_length, dir);
|
|
s->dma_address = s->dma_length = 0;
|
|
}
|
|
|
|
domain_flush_complete(domain);
|
|
|
|
spin_unlock_irqrestore(&domain->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* The exported alloc_coherent function for dma_ops.
|
|
*/
|
|
static void *alloc_coherent(struct device *dev, size_t size,
|
|
dma_addr_t *dma_addr, gfp_t flag)
|
|
{
|
|
unsigned long flags;
|
|
void *virt_addr;
|
|
struct protection_domain *domain;
|
|
phys_addr_t paddr;
|
|
u64 dma_mask = dev->coherent_dma_mask;
|
|
|
|
INC_STATS_COUNTER(cnt_alloc_coherent);
|
|
|
|
domain = get_domain(dev);
|
|
if (PTR_ERR(domain) == -EINVAL) {
|
|
virt_addr = (void *)__get_free_pages(flag, get_order(size));
|
|
*dma_addr = __pa(virt_addr);
|
|
return virt_addr;
|
|
} else if (IS_ERR(domain))
|
|
return NULL;
|
|
|
|
dma_mask = dev->coherent_dma_mask;
|
|
flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
|
|
flag |= __GFP_ZERO;
|
|
|
|
virt_addr = (void *)__get_free_pages(flag, get_order(size));
|
|
if (!virt_addr)
|
|
return NULL;
|
|
|
|
paddr = virt_to_phys(virt_addr);
|
|
|
|
if (!dma_mask)
|
|
dma_mask = *dev->dma_mask;
|
|
|
|
spin_lock_irqsave(&domain->lock, flags);
|
|
|
|
*dma_addr = __map_single(dev, domain->priv, paddr,
|
|
size, DMA_BIDIRECTIONAL, true, dma_mask);
|
|
|
|
if (*dma_addr == DMA_ERROR_CODE) {
|
|
spin_unlock_irqrestore(&domain->lock, flags);
|
|
goto out_free;
|
|
}
|
|
|
|
domain_flush_complete(domain);
|
|
|
|
spin_unlock_irqrestore(&domain->lock, flags);
|
|
|
|
return virt_addr;
|
|
|
|
out_free:
|
|
|
|
free_pages((unsigned long)virt_addr, get_order(size));
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* The exported free_coherent function for dma_ops.
|
|
*/
|
|
static void free_coherent(struct device *dev, size_t size,
|
|
void *virt_addr, dma_addr_t dma_addr)
|
|
{
|
|
unsigned long flags;
|
|
struct protection_domain *domain;
|
|
|
|
INC_STATS_COUNTER(cnt_free_coherent);
|
|
|
|
domain = get_domain(dev);
|
|
if (IS_ERR(domain))
|
|
goto free_mem;
|
|
|
|
spin_lock_irqsave(&domain->lock, flags);
|
|
|
|
__unmap_single(domain->priv, dma_addr, size, DMA_BIDIRECTIONAL);
|
|
|
|
domain_flush_complete(domain);
|
|
|
|
spin_unlock_irqrestore(&domain->lock, flags);
|
|
|
|
free_mem:
|
|
free_pages((unsigned long)virt_addr, get_order(size));
|
|
}
|
|
|
|
/*
|
|
* This function is called by the DMA layer to find out if we can handle a
|
|
* particular device. It is part of the dma_ops.
|
|
*/
|
|
static int amd_iommu_dma_supported(struct device *dev, u64 mask)
|
|
{
|
|
return check_device(dev);
|
|
}
|
|
|
|
/*
|
|
* The function for pre-allocating protection domains.
|
|
*
|
|
* If the driver core informs the DMA layer if a driver grabs a device
|
|
* we don't need to preallocate the protection domains anymore.
|
|
* For now we have to.
|
|
*/
|
|
static void prealloc_protection_domains(void)
|
|
{
|
|
struct iommu_dev_data *dev_data;
|
|
struct dma_ops_domain *dma_dom;
|
|
struct pci_dev *dev = NULL;
|
|
u16 devid;
|
|
|
|
for_each_pci_dev(dev) {
|
|
|
|
/* Do we handle this device? */
|
|
if (!check_device(&dev->dev))
|
|
continue;
|
|
|
|
dev_data = get_dev_data(&dev->dev);
|
|
if (!amd_iommu_force_isolation && dev_data->iommu_v2) {
|
|
/* Make sure passthrough domain is allocated */
|
|
alloc_passthrough_domain();
|
|
dev_data->passthrough = true;
|
|
attach_device(&dev->dev, pt_domain);
|
|
pr_info("AMD-Vi: Using passthough domain for device %s\n",
|
|
dev_name(&dev->dev));
|
|
}
|
|
|
|
/* Is there already any domain for it? */
|
|
if (domain_for_device(&dev->dev))
|
|
continue;
|
|
|
|
devid = get_device_id(&dev->dev);
|
|
|
|
dma_dom = dma_ops_domain_alloc();
|
|
if (!dma_dom)
|
|
continue;
|
|
init_unity_mappings_for_device(dma_dom, devid);
|
|
dma_dom->target_dev = devid;
|
|
|
|
attach_device(&dev->dev, &dma_dom->domain);
|
|
|
|
list_add_tail(&dma_dom->list, &iommu_pd_list);
|
|
}
|
|
}
|
|
|
|
static struct dma_map_ops amd_iommu_dma_ops = {
|
|
.alloc_coherent = alloc_coherent,
|
|
.free_coherent = free_coherent,
|
|
.map_page = map_page,
|
|
.unmap_page = unmap_page,
|
|
.map_sg = map_sg,
|
|
.unmap_sg = unmap_sg,
|
|
.dma_supported = amd_iommu_dma_supported,
|
|
};
|
|
|
|
static unsigned device_dma_ops_init(void)
|
|
{
|
|
struct iommu_dev_data *dev_data;
|
|
struct pci_dev *pdev = NULL;
|
|
unsigned unhandled = 0;
|
|
|
|
for_each_pci_dev(pdev) {
|
|
if (!check_device(&pdev->dev)) {
|
|
unhandled += 1;
|
|
continue;
|
|
}
|
|
|
|
dev_data = get_dev_data(&pdev->dev);
|
|
|
|
if (!dev_data->passthrough)
|
|
pdev->dev.archdata.dma_ops = &amd_iommu_dma_ops;
|
|
else
|
|
pdev->dev.archdata.dma_ops = &nommu_dma_ops;
|
|
}
|
|
|
|
return unhandled;
|
|
}
|
|
|
|
/*
|
|
* The function which clues the AMD IOMMU driver into dma_ops.
|
|
*/
|
|
|
|
void __init amd_iommu_init_api(void)
|
|
{
|
|
bus_set_iommu(&pci_bus_type, &amd_iommu_ops);
|
|
}
|
|
|
|
int __init amd_iommu_init_dma_ops(void)
|
|
{
|
|
struct amd_iommu *iommu;
|
|
int ret, unhandled;
|
|
|
|
/*
|
|
* first allocate a default protection domain for every IOMMU we
|
|
* found in the system. Devices not assigned to any other
|
|
* protection domain will be assigned to the default one.
|
|
*/
|
|
for_each_iommu(iommu) {
|
|
iommu->default_dom = dma_ops_domain_alloc();
|
|
if (iommu->default_dom == NULL)
|
|
return -ENOMEM;
|
|
iommu->default_dom->domain.flags |= PD_DEFAULT_MASK;
|
|
ret = iommu_init_unity_mappings(iommu);
|
|
if (ret)
|
|
goto free_domains;
|
|
}
|
|
|
|
/*
|
|
* Pre-allocate the protection domains for each device.
|
|
*/
|
|
prealloc_protection_domains();
|
|
|
|
iommu_detected = 1;
|
|
swiotlb = 0;
|
|
|
|
/* Make the driver finally visible to the drivers */
|
|
unhandled = device_dma_ops_init();
|
|
if (unhandled && max_pfn > MAX_DMA32_PFN) {
|
|
/* There are unhandled devices - initialize swiotlb for them */
|
|
swiotlb = 1;
|
|
}
|
|
|
|
amd_iommu_stats_init();
|
|
|
|
return 0;
|
|
|
|
free_domains:
|
|
|
|
for_each_iommu(iommu) {
|
|
if (iommu->default_dom)
|
|
dma_ops_domain_free(iommu->default_dom);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* The following functions belong to the exported interface of AMD IOMMU
|
|
*
|
|
* This interface allows access to lower level functions of the IOMMU
|
|
* like protection domain handling and assignement of devices to domains
|
|
* which is not possible with the dma_ops interface.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
static void cleanup_domain(struct protection_domain *domain)
|
|
{
|
|
struct iommu_dev_data *dev_data, *next;
|
|
unsigned long flags;
|
|
|
|
write_lock_irqsave(&amd_iommu_devtable_lock, flags);
|
|
|
|
list_for_each_entry_safe(dev_data, next, &domain->dev_list, list) {
|
|
__detach_device(dev_data);
|
|
atomic_set(&dev_data->bind, 0);
|
|
}
|
|
|
|
write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
|
|
}
|
|
|
|
static void protection_domain_free(struct protection_domain *domain)
|
|
{
|
|
if (!domain)
|
|
return;
|
|
|
|
del_domain_from_list(domain);
|
|
|
|
if (domain->id)
|
|
domain_id_free(domain->id);
|
|
|
|
kfree(domain);
|
|
}
|
|
|
|
static struct protection_domain *protection_domain_alloc(void)
|
|
{
|
|
struct protection_domain *domain;
|
|
|
|
domain = kzalloc(sizeof(*domain), GFP_KERNEL);
|
|
if (!domain)
|
|
return NULL;
|
|
|
|
spin_lock_init(&domain->lock);
|
|
mutex_init(&domain->api_lock);
|
|
domain->id = domain_id_alloc();
|
|
if (!domain->id)
|
|
goto out_err;
|
|
INIT_LIST_HEAD(&domain->dev_list);
|
|
|
|
add_domain_to_list(domain);
|
|
|
|
return domain;
|
|
|
|
out_err:
|
|
kfree(domain);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int __init alloc_passthrough_domain(void)
|
|
{
|
|
if (pt_domain != NULL)
|
|
return 0;
|
|
|
|
/* allocate passthrough domain */
|
|
pt_domain = protection_domain_alloc();
|
|
if (!pt_domain)
|
|
return -ENOMEM;
|
|
|
|
pt_domain->mode = PAGE_MODE_NONE;
|
|
|
|
return 0;
|
|
}
|
|
static int amd_iommu_domain_init(struct iommu_domain *dom)
|
|
{
|
|
struct protection_domain *domain;
|
|
|
|
domain = protection_domain_alloc();
|
|
if (!domain)
|
|
goto out_free;
|
|
|
|
domain->mode = PAGE_MODE_3_LEVEL;
|
|
domain->pt_root = (void *)get_zeroed_page(GFP_KERNEL);
|
|
if (!domain->pt_root)
|
|
goto out_free;
|
|
|
|
dom->priv = domain;
|
|
|
|
return 0;
|
|
|
|
out_free:
|
|
protection_domain_free(domain);
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void amd_iommu_domain_destroy(struct iommu_domain *dom)
|
|
{
|
|
struct protection_domain *domain = dom->priv;
|
|
|
|
if (!domain)
|
|
return;
|
|
|
|
if (domain->dev_cnt > 0)
|
|
cleanup_domain(domain);
|
|
|
|
BUG_ON(domain->dev_cnt != 0);
|
|
|
|
if (domain->mode != PAGE_MODE_NONE)
|
|
free_pagetable(domain);
|
|
|
|
if (domain->flags & PD_IOMMUV2_MASK)
|
|
free_gcr3_table(domain);
|
|
|
|
protection_domain_free(domain);
|
|
|
|
dom->priv = NULL;
|
|
}
|
|
|
|
static void amd_iommu_detach_device(struct iommu_domain *dom,
|
|
struct device *dev)
|
|
{
|
|
struct iommu_dev_data *dev_data = dev->archdata.iommu;
|
|
struct amd_iommu *iommu;
|
|
u16 devid;
|
|
|
|
if (!check_device(dev))
|
|
return;
|
|
|
|
devid = get_device_id(dev);
|
|
|
|
if (dev_data->domain != NULL)
|
|
detach_device(dev);
|
|
|
|
iommu = amd_iommu_rlookup_table[devid];
|
|
if (!iommu)
|
|
return;
|
|
|
|
iommu_completion_wait(iommu);
|
|
}
|
|
|
|
static int amd_iommu_attach_device(struct iommu_domain *dom,
|
|
struct device *dev)
|
|
{
|
|
struct protection_domain *domain = dom->priv;
|
|
struct iommu_dev_data *dev_data;
|
|
struct amd_iommu *iommu;
|
|
int ret;
|
|
|
|
if (!check_device(dev))
|
|
return -EINVAL;
|
|
|
|
dev_data = dev->archdata.iommu;
|
|
|
|
iommu = amd_iommu_rlookup_table[dev_data->devid];
|
|
if (!iommu)
|
|
return -EINVAL;
|
|
|
|
if (dev_data->domain)
|
|
detach_device(dev);
|
|
|
|
ret = attach_device(dev, domain);
|
|
|
|
iommu_completion_wait(iommu);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova,
|
|
phys_addr_t paddr, int gfp_order, int iommu_prot)
|
|
{
|
|
unsigned long page_size = 0x1000UL << gfp_order;
|
|
struct protection_domain *domain = dom->priv;
|
|
int prot = 0;
|
|
int ret;
|
|
|
|
if (domain->mode == PAGE_MODE_NONE)
|
|
return -EINVAL;
|
|
|
|
if (iommu_prot & IOMMU_READ)
|
|
prot |= IOMMU_PROT_IR;
|
|
if (iommu_prot & IOMMU_WRITE)
|
|
prot |= IOMMU_PROT_IW;
|
|
|
|
mutex_lock(&domain->api_lock);
|
|
ret = iommu_map_page(domain, iova, paddr, prot, page_size);
|
|
mutex_unlock(&domain->api_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova,
|
|
int gfp_order)
|
|
{
|
|
struct protection_domain *domain = dom->priv;
|
|
unsigned long page_size, unmap_size;
|
|
|
|
if (domain->mode == PAGE_MODE_NONE)
|
|
return -EINVAL;
|
|
|
|
page_size = 0x1000UL << gfp_order;
|
|
|
|
mutex_lock(&domain->api_lock);
|
|
unmap_size = iommu_unmap_page(domain, iova, page_size);
|
|
mutex_unlock(&domain->api_lock);
|
|
|
|
domain_flush_tlb_pde(domain);
|
|
|
|
return get_order(unmap_size);
|
|
}
|
|
|
|
static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
|
|
unsigned long iova)
|
|
{
|
|
struct protection_domain *domain = dom->priv;
|
|
unsigned long offset_mask;
|
|
phys_addr_t paddr;
|
|
u64 *pte, __pte;
|
|
|
|
if (domain->mode == PAGE_MODE_NONE)
|
|
return iova;
|
|
|
|
pte = fetch_pte(domain, iova);
|
|
|
|
if (!pte || !IOMMU_PTE_PRESENT(*pte))
|
|
return 0;
|
|
|
|
if (PM_PTE_LEVEL(*pte) == 0)
|
|
offset_mask = PAGE_SIZE - 1;
|
|
else
|
|
offset_mask = PTE_PAGE_SIZE(*pte) - 1;
|
|
|
|
__pte = *pte & PM_ADDR_MASK;
|
|
paddr = (__pte & ~offset_mask) | (iova & offset_mask);
|
|
|
|
return paddr;
|
|
}
|
|
|
|
static int amd_iommu_domain_has_cap(struct iommu_domain *domain,
|
|
unsigned long cap)
|
|
{
|
|
switch (cap) {
|
|
case IOMMU_CAP_CACHE_COHERENCY:
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct iommu_ops amd_iommu_ops = {
|
|
.domain_init = amd_iommu_domain_init,
|
|
.domain_destroy = amd_iommu_domain_destroy,
|
|
.attach_dev = amd_iommu_attach_device,
|
|
.detach_dev = amd_iommu_detach_device,
|
|
.map = amd_iommu_map,
|
|
.unmap = amd_iommu_unmap,
|
|
.iova_to_phys = amd_iommu_iova_to_phys,
|
|
.domain_has_cap = amd_iommu_domain_has_cap,
|
|
};
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* The next functions do a basic initialization of IOMMU for pass through
|
|
* mode
|
|
*
|
|
* In passthrough mode the IOMMU is initialized and enabled but not used for
|
|
* DMA-API translation.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
int __init amd_iommu_init_passthrough(void)
|
|
{
|
|
struct iommu_dev_data *dev_data;
|
|
struct pci_dev *dev = NULL;
|
|
struct amd_iommu *iommu;
|
|
u16 devid;
|
|
int ret;
|
|
|
|
ret = alloc_passthrough_domain();
|
|
if (ret)
|
|
return ret;
|
|
|
|
for_each_pci_dev(dev) {
|
|
if (!check_device(&dev->dev))
|
|
continue;
|
|
|
|
dev_data = get_dev_data(&dev->dev);
|
|
dev_data->passthrough = true;
|
|
|
|
devid = get_device_id(&dev->dev);
|
|
|
|
iommu = amd_iommu_rlookup_table[devid];
|
|
if (!iommu)
|
|
continue;
|
|
|
|
attach_device(&dev->dev, pt_domain);
|
|
}
|
|
|
|
pr_info("AMD-Vi: Initialized for Passthrough Mode\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* IOMMUv2 specific functions */
|
|
int amd_iommu_register_ppr_notifier(struct notifier_block *nb)
|
|
{
|
|
return atomic_notifier_chain_register(&ppr_notifier, nb);
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_register_ppr_notifier);
|
|
|
|
int amd_iommu_unregister_ppr_notifier(struct notifier_block *nb)
|
|
{
|
|
return atomic_notifier_chain_unregister(&ppr_notifier, nb);
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_unregister_ppr_notifier);
|
|
|
|
void amd_iommu_domain_direct_map(struct iommu_domain *dom)
|
|
{
|
|
struct protection_domain *domain = dom->priv;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&domain->lock, flags);
|
|
|
|
/* Update data structure */
|
|
domain->mode = PAGE_MODE_NONE;
|
|
domain->updated = true;
|
|
|
|
/* Make changes visible to IOMMUs */
|
|
update_domain(domain);
|
|
|
|
/* Page-table is not visible to IOMMU anymore, so free it */
|
|
free_pagetable(domain);
|
|
|
|
spin_unlock_irqrestore(&domain->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_domain_direct_map);
|
|
|
|
int amd_iommu_domain_enable_v2(struct iommu_domain *dom, int pasids)
|
|
{
|
|
struct protection_domain *domain = dom->priv;
|
|
unsigned long flags;
|
|
int levels, ret;
|
|
|
|
if (pasids <= 0 || pasids > (PASID_MASK + 1))
|
|
return -EINVAL;
|
|
|
|
/* Number of GCR3 table levels required */
|
|
for (levels = 0; (pasids - 1) & ~0x1ff; pasids >>= 9)
|
|
levels += 1;
|
|
|
|
if (levels > amd_iommu_max_glx_val)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&domain->lock, flags);
|
|
|
|
/*
|
|
* Save us all sanity checks whether devices already in the
|
|
* domain support IOMMUv2. Just force that the domain has no
|
|
* devices attached when it is switched into IOMMUv2 mode.
|
|
*/
|
|
ret = -EBUSY;
|
|
if (domain->dev_cnt > 0 || domain->flags & PD_IOMMUV2_MASK)
|
|
goto out;
|
|
|
|
ret = -ENOMEM;
|
|
domain->gcr3_tbl = (void *)get_zeroed_page(GFP_ATOMIC);
|
|
if (domain->gcr3_tbl == NULL)
|
|
goto out;
|
|
|
|
domain->glx = levels;
|
|
domain->flags |= PD_IOMMUV2_MASK;
|
|
domain->updated = true;
|
|
|
|
update_domain(domain);
|
|
|
|
ret = 0;
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&domain->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(amd_iommu_domain_enable_v2);
|