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linux-next/drivers/iommu/intel-pasid.c

642 lines
14 KiB
C

// SPDX-License-Identifier: GPL-2.0
/**
* intel-pasid.c - PASID idr, table and entry manipulation
*
* Copyright (C) 2018 Intel Corporation
*
* Author: Lu Baolu <baolu.lu@linux.intel.com>
*/
#define pr_fmt(fmt) "DMAR: " fmt
#include <linux/bitops.h>
#include <linux/cpufeature.h>
#include <linux/dmar.h>
#include <linux/intel-iommu.h>
#include <linux/iommu.h>
#include <linux/memory.h>
#include <linux/pci.h>
#include <linux/pci-ats.h>
#include <linux/spinlock.h>
#include "intel-pasid.h"
/*
* Intel IOMMU system wide PASID name space:
*/
static DEFINE_SPINLOCK(pasid_lock);
u32 intel_pasid_max_id = PASID_MAX;
static DEFINE_IDR(pasid_idr);
int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp)
{
int ret, min, max;
min = max_t(int, start, PASID_MIN);
max = min_t(int, end, intel_pasid_max_id);
WARN_ON(in_interrupt());
idr_preload(gfp);
spin_lock(&pasid_lock);
ret = idr_alloc(&pasid_idr, ptr, min, max, GFP_ATOMIC);
spin_unlock(&pasid_lock);
idr_preload_end();
return ret;
}
void intel_pasid_free_id(int pasid)
{
spin_lock(&pasid_lock);
idr_remove(&pasid_idr, pasid);
spin_unlock(&pasid_lock);
}
void *intel_pasid_lookup_id(int pasid)
{
void *p;
spin_lock(&pasid_lock);
p = idr_find(&pasid_idr, pasid);
spin_unlock(&pasid_lock);
return p;
}
/*
* Per device pasid table management:
*/
static inline void
device_attach_pasid_table(struct device_domain_info *info,
struct pasid_table *pasid_table)
{
info->pasid_table = pasid_table;
list_add(&info->table, &pasid_table->dev);
}
static inline void
device_detach_pasid_table(struct device_domain_info *info,
struct pasid_table *pasid_table)
{
info->pasid_table = NULL;
list_del(&info->table);
}
struct pasid_table_opaque {
struct pasid_table **pasid_table;
int segment;
int bus;
int devfn;
};
static int search_pasid_table(struct device_domain_info *info, void *opaque)
{
struct pasid_table_opaque *data = opaque;
if (info->iommu->segment == data->segment &&
info->bus == data->bus &&
info->devfn == data->devfn &&
info->pasid_table) {
*data->pasid_table = info->pasid_table;
return 1;
}
return 0;
}
static int get_alias_pasid_table(struct pci_dev *pdev, u16 alias, void *opaque)
{
struct pasid_table_opaque *data = opaque;
data->segment = pci_domain_nr(pdev->bus);
data->bus = PCI_BUS_NUM(alias);
data->devfn = alias & 0xff;
return for_each_device_domain(&search_pasid_table, data);
}
/*
* Allocate a pasid table for @dev. It should be called in a
* single-thread context.
*/
int intel_pasid_alloc_table(struct device *dev)
{
struct device_domain_info *info;
struct pasid_table *pasid_table;
struct pasid_table_opaque data;
struct page *pages;
int max_pasid = 0;
int ret, order;
int size;
might_sleep();
info = dev->archdata.iommu;
if (WARN_ON(!info || !dev_is_pci(dev) || info->pasid_table))
return -EINVAL;
/* DMA alias device already has a pasid table, use it: */
data.pasid_table = &pasid_table;
ret = pci_for_each_dma_alias(to_pci_dev(dev),
&get_alias_pasid_table, &data);
if (ret)
goto attach_out;
pasid_table = kzalloc(sizeof(*pasid_table), GFP_KERNEL);
if (!pasid_table)
return -ENOMEM;
INIT_LIST_HEAD(&pasid_table->dev);
if (info->pasid_supported)
max_pasid = min_t(int, pci_max_pasids(to_pci_dev(dev)),
intel_pasid_max_id);
size = max_pasid >> (PASID_PDE_SHIFT - 3);
order = size ? get_order(size) : 0;
pages = alloc_pages_node(info->iommu->node,
GFP_KERNEL | __GFP_ZERO, order);
if (!pages) {
kfree(pasid_table);
return -ENOMEM;
}
pasid_table->table = page_address(pages);
pasid_table->order = order;
pasid_table->max_pasid = 1 << (order + PAGE_SHIFT + 3);
attach_out:
device_attach_pasid_table(info, pasid_table);
return 0;
}
void intel_pasid_free_table(struct device *dev)
{
struct device_domain_info *info;
struct pasid_table *pasid_table;
struct pasid_dir_entry *dir;
struct pasid_entry *table;
int i, max_pde;
info = dev->archdata.iommu;
if (!info || !dev_is_pci(dev) || !info->pasid_table)
return;
pasid_table = info->pasid_table;
device_detach_pasid_table(info, pasid_table);
if (!list_empty(&pasid_table->dev))
return;
/* Free scalable mode PASID directory tables: */
dir = pasid_table->table;
max_pde = pasid_table->max_pasid >> PASID_PDE_SHIFT;
for (i = 0; i < max_pde; i++) {
table = get_pasid_table_from_pde(&dir[i]);
free_pgtable_page(table);
}
free_pages((unsigned long)pasid_table->table, pasid_table->order);
kfree(pasid_table);
}
struct pasid_table *intel_pasid_get_table(struct device *dev)
{
struct device_domain_info *info;
info = dev->archdata.iommu;
if (!info)
return NULL;
return info->pasid_table;
}
int intel_pasid_get_dev_max_id(struct device *dev)
{
struct device_domain_info *info;
info = dev->archdata.iommu;
if (!info || !info->pasid_table)
return 0;
return info->pasid_table->max_pasid;
}
struct pasid_entry *intel_pasid_get_entry(struct device *dev, int pasid)
{
struct device_domain_info *info;
struct pasid_table *pasid_table;
struct pasid_dir_entry *dir;
struct pasid_entry *entries;
int dir_index, index;
pasid_table = intel_pasid_get_table(dev);
if (WARN_ON(!pasid_table || pasid < 0 ||
pasid >= intel_pasid_get_dev_max_id(dev)))
return NULL;
dir = pasid_table->table;
info = dev->archdata.iommu;
dir_index = pasid >> PASID_PDE_SHIFT;
index = pasid & PASID_PTE_MASK;
spin_lock(&pasid_lock);
entries = get_pasid_table_from_pde(&dir[dir_index]);
if (!entries) {
entries = alloc_pgtable_page(info->iommu->node);
if (!entries) {
spin_unlock(&pasid_lock);
return NULL;
}
WRITE_ONCE(dir[dir_index].val,
(u64)virt_to_phys(entries) | PASID_PTE_PRESENT);
}
spin_unlock(&pasid_lock);
return &entries[index];
}
/*
* Interfaces for PASID table entry manipulation:
*/
static inline void pasid_clear_entry(struct pasid_entry *pe)
{
WRITE_ONCE(pe->val[0], 0);
WRITE_ONCE(pe->val[1], 0);
WRITE_ONCE(pe->val[2], 0);
WRITE_ONCE(pe->val[3], 0);
WRITE_ONCE(pe->val[4], 0);
WRITE_ONCE(pe->val[5], 0);
WRITE_ONCE(pe->val[6], 0);
WRITE_ONCE(pe->val[7], 0);
}
static void intel_pasid_clear_entry(struct device *dev, int pasid)
{
struct pasid_entry *pe;
pe = intel_pasid_get_entry(dev, pasid);
if (WARN_ON(!pe))
return;
pasid_clear_entry(pe);
}
static inline void pasid_set_bits(u64 *ptr, u64 mask, u64 bits)
{
u64 old;
old = READ_ONCE(*ptr);
WRITE_ONCE(*ptr, (old & ~mask) | bits);
}
/*
* Setup the DID(Domain Identifier) field (Bit 64~79) of scalable mode
* PASID entry.
*/
static inline void
pasid_set_domain_id(struct pasid_entry *pe, u64 value)
{
pasid_set_bits(&pe->val[1], GENMASK_ULL(15, 0), value);
}
/*
* Get domain ID value of a scalable mode PASID entry.
*/
static inline u16
pasid_get_domain_id(struct pasid_entry *pe)
{
return (u16)(READ_ONCE(pe->val[1]) & GENMASK_ULL(15, 0));
}
/*
* Setup the SLPTPTR(Second Level Page Table Pointer) field (Bit 12~63)
* of a scalable mode PASID entry.
*/
static inline void
pasid_set_slptr(struct pasid_entry *pe, u64 value)
{
pasid_set_bits(&pe->val[0], VTD_PAGE_MASK, value);
}
/*
* Setup the AW(Address Width) field (Bit 2~4) of a scalable mode PASID
* entry.
*/
static inline void
pasid_set_address_width(struct pasid_entry *pe, u64 value)
{
pasid_set_bits(&pe->val[0], GENMASK_ULL(4, 2), value << 2);
}
/*
* Setup the PGTT(PASID Granular Translation Type) field (Bit 6~8)
* of a scalable mode PASID entry.
*/
static inline void
pasid_set_translation_type(struct pasid_entry *pe, u64 value)
{
pasid_set_bits(&pe->val[0], GENMASK_ULL(8, 6), value << 6);
}
/*
* Enable fault processing by clearing the FPD(Fault Processing
* Disable) field (Bit 1) of a scalable mode PASID entry.
*/
static inline void pasid_set_fault_enable(struct pasid_entry *pe)
{
pasid_set_bits(&pe->val[0], 1 << 1, 0);
}
/*
* Setup the SRE(Supervisor Request Enable) field (Bit 128) of a
* scalable mode PASID entry.
*/
static inline void pasid_set_sre(struct pasid_entry *pe)
{
pasid_set_bits(&pe->val[2], 1 << 0, 1);
}
/*
* Setup the P(Present) field (Bit 0) of a scalable mode PASID
* entry.
*/
static inline void pasid_set_present(struct pasid_entry *pe)
{
pasid_set_bits(&pe->val[0], 1 << 0, 1);
}
/*
* Setup Page Walk Snoop bit (Bit 87) of a scalable mode PASID
* entry.
*/
static inline void pasid_set_page_snoop(struct pasid_entry *pe, bool value)
{
pasid_set_bits(&pe->val[1], 1 << 23, value << 23);
}
/*
* Setup the First Level Page table Pointer field (Bit 140~191)
* of a scalable mode PASID entry.
*/
static inline void
pasid_set_flptr(struct pasid_entry *pe, u64 value)
{
pasid_set_bits(&pe->val[2], VTD_PAGE_MASK, value);
}
/*
* Setup the First Level Paging Mode field (Bit 130~131) of a
* scalable mode PASID entry.
*/
static inline void
pasid_set_flpm(struct pasid_entry *pe, u64 value)
{
pasid_set_bits(&pe->val[2], GENMASK_ULL(3, 2), value << 2);
}
static void
pasid_cache_invalidation_with_pasid(struct intel_iommu *iommu,
u16 did, int pasid)
{
struct qi_desc desc;
desc.qw0 = QI_PC_DID(did) | QI_PC_PASID_SEL | QI_PC_PASID(pasid);
desc.qw1 = 0;
desc.qw2 = 0;
desc.qw3 = 0;
qi_submit_sync(&desc, iommu);
}
static void
iotlb_invalidation_with_pasid(struct intel_iommu *iommu, u16 did, u32 pasid)
{
struct qi_desc desc;
desc.qw0 = QI_EIOTLB_PASID(pasid) | QI_EIOTLB_DID(did) |
QI_EIOTLB_GRAN(QI_GRAN_NONG_PASID) | QI_EIOTLB_TYPE;
desc.qw1 = 0;
desc.qw2 = 0;
desc.qw3 = 0;
qi_submit_sync(&desc, iommu);
}
static void
devtlb_invalidation_with_pasid(struct intel_iommu *iommu,
struct device *dev, int pasid)
{
struct device_domain_info *info;
u16 sid, qdep, pfsid;
info = dev->archdata.iommu;
if (!info || !info->ats_enabled)
return;
sid = info->bus << 8 | info->devfn;
qdep = info->ats_qdep;
pfsid = info->pfsid;
qi_flush_dev_iotlb(iommu, sid, pfsid, qdep, 0, 64 - VTD_PAGE_SHIFT);
}
void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
struct device *dev, int pasid)
{
struct pasid_entry *pte;
u16 did;
pte = intel_pasid_get_entry(dev, pasid);
if (WARN_ON(!pte))
return;
did = pasid_get_domain_id(pte);
intel_pasid_clear_entry(dev, pasid);
if (!ecap_coherent(iommu->ecap))
clflush_cache_range(pte, sizeof(*pte));
pasid_cache_invalidation_with_pasid(iommu, did, pasid);
iotlb_invalidation_with_pasid(iommu, did, pasid);
/* Device IOTLB doesn't need to be flushed in caching mode. */
if (!cap_caching_mode(iommu->cap))
devtlb_invalidation_with_pasid(iommu, dev, pasid);
}
/*
* Set up the scalable mode pasid table entry for first only
* translation type.
*/
int intel_pasid_setup_first_level(struct intel_iommu *iommu,
struct device *dev, pgd_t *pgd,
int pasid, u16 did, int flags)
{
struct pasid_entry *pte;
if (!ecap_flts(iommu->ecap)) {
pr_err("No first level translation support on %s\n",
iommu->name);
return -EINVAL;
}
pte = intel_pasid_get_entry(dev, pasid);
if (WARN_ON(!pte))
return -EINVAL;
pasid_clear_entry(pte);
/* Setup the first level page table pointer: */
pasid_set_flptr(pte, (u64)__pa(pgd));
if (flags & PASID_FLAG_SUPERVISOR_MODE) {
if (!ecap_srs(iommu->ecap)) {
pr_err("No supervisor request support on %s\n",
iommu->name);
return -EINVAL;
}
pasid_set_sre(pte);
}
#ifdef CONFIG_X86
if (cpu_feature_enabled(X86_FEATURE_LA57))
pasid_set_flpm(pte, 1);
#endif /* CONFIG_X86 */
pasid_set_domain_id(pte, did);
pasid_set_address_width(pte, iommu->agaw);
pasid_set_page_snoop(pte, !!ecap_smpwc(iommu->ecap));
/* Setup Present and PASID Granular Transfer Type: */
pasid_set_translation_type(pte, 1);
pasid_set_present(pte);
if (!ecap_coherent(iommu->ecap))
clflush_cache_range(pte, sizeof(*pte));
if (cap_caching_mode(iommu->cap)) {
pasid_cache_invalidation_with_pasid(iommu, did, pasid);
iotlb_invalidation_with_pasid(iommu, did, pasid);
} else {
iommu_flush_write_buffer(iommu);
}
return 0;
}
/*
* Set up the scalable mode pasid entry for second only translation type.
*/
int intel_pasid_setup_second_level(struct intel_iommu *iommu,
struct dmar_domain *domain,
struct device *dev, int pasid)
{
struct pasid_entry *pte;
struct dma_pte *pgd;
u64 pgd_val;
int agaw;
u16 did;
/*
* If hardware advertises no support for second level
* translation, return directly.
*/
if (!ecap_slts(iommu->ecap)) {
pr_err("No second level translation support on %s\n",
iommu->name);
return -EINVAL;
}
/*
* Skip top levels of page tables for iommu which has less agaw
* than default. Unnecessary for PT mode.
*/
pgd = domain->pgd;
for (agaw = domain->agaw; agaw > iommu->agaw; agaw--) {
pgd = phys_to_virt(dma_pte_addr(pgd));
if (!dma_pte_present(pgd)) {
dev_err(dev, "Invalid domain page table\n");
return -EINVAL;
}
}
pgd_val = virt_to_phys(pgd);
did = domain->iommu_did[iommu->seq_id];
pte = intel_pasid_get_entry(dev, pasid);
if (!pte) {
dev_err(dev, "Failed to get pasid entry of PASID %d\n", pasid);
return -ENODEV;
}
pasid_clear_entry(pte);
pasid_set_domain_id(pte, did);
pasid_set_slptr(pte, pgd_val);
pasid_set_address_width(pte, agaw);
pasid_set_translation_type(pte, 2);
pasid_set_fault_enable(pte);
pasid_set_page_snoop(pte, !!ecap_smpwc(iommu->ecap));
/*
* Since it is a second level only translation setup, we should
* set SRE bit as well (addresses are expected to be GPAs).
*/
pasid_set_sre(pte);
pasid_set_present(pte);
if (!ecap_coherent(iommu->ecap))
clflush_cache_range(pte, sizeof(*pte));
if (cap_caching_mode(iommu->cap)) {
pasid_cache_invalidation_with_pasid(iommu, did, pasid);
iotlb_invalidation_with_pasid(iommu, did, pasid);
} else {
iommu_flush_write_buffer(iommu);
}
return 0;
}
/*
* Set up the scalable mode pasid entry for passthrough translation type.
*/
int intel_pasid_setup_pass_through(struct intel_iommu *iommu,
struct dmar_domain *domain,
struct device *dev, int pasid)
{
u16 did = FLPT_DEFAULT_DID;
struct pasid_entry *pte;
pte = intel_pasid_get_entry(dev, pasid);
if (!pte) {
dev_err(dev, "Failed to get pasid entry of PASID %d\n", pasid);
return -ENODEV;
}
pasid_clear_entry(pte);
pasid_set_domain_id(pte, did);
pasid_set_address_width(pte, iommu->agaw);
pasid_set_translation_type(pte, 4);
pasid_set_fault_enable(pte);
pasid_set_page_snoop(pte, !!ecap_smpwc(iommu->ecap));
/*
* We should set SRE bit as well since the addresses are expected
* to be GPAs.
*/
pasid_set_sre(pte);
pasid_set_present(pte);
if (!ecap_coherent(iommu->ecap))
clflush_cache_range(pte, sizeof(*pte));
if (cap_caching_mode(iommu->cap)) {
pasid_cache_invalidation_with_pasid(iommu, did, pasid);
iotlb_invalidation_with_pasid(iommu, did, pasid);
} else {
iommu_flush_write_buffer(iommu);
}
return 0;
}