linux/drivers/pci/intr_remapping.c

472 lines
9.6 KiB
C

#include <linux/dmar.h>
#include <linux/spinlock.h>
#include <linux/jiffies.h>
#include <linux/pci.h>
#include <linux/irq.h>
#include <asm/io_apic.h>
#include <linux/intel-iommu.h>
#include "intr_remapping.h"
static struct ioapic_scope ir_ioapic[MAX_IO_APICS];
static int ir_ioapic_num;
int intr_remapping_enabled;
static struct {
struct intel_iommu *iommu;
u16 irte_index;
u16 sub_handle;
u8 irte_mask;
} irq_2_iommu[NR_IRQS];
static DEFINE_SPINLOCK(irq_2_ir_lock);
int irq_remapped(int irq)
{
if (irq > NR_IRQS)
return 0;
if (!irq_2_iommu[irq].iommu)
return 0;
return 1;
}
int get_irte(int irq, struct irte *entry)
{
int index;
if (!entry || irq > NR_IRQS)
return -1;
spin_lock(&irq_2_ir_lock);
if (!irq_2_iommu[irq].iommu) {
spin_unlock(&irq_2_ir_lock);
return -1;
}
index = irq_2_iommu[irq].irte_index + irq_2_iommu[irq].sub_handle;
*entry = *(irq_2_iommu[irq].iommu->ir_table->base + index);
spin_unlock(&irq_2_ir_lock);
return 0;
}
int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
{
struct ir_table *table = iommu->ir_table;
u16 index, start_index;
unsigned int mask = 0;
int i;
if (!count)
return -1;
/*
* start the IRTE search from index 0.
*/
index = start_index = 0;
if (count > 1) {
count = __roundup_pow_of_two(count);
mask = ilog2(count);
}
if (mask > ecap_max_handle_mask(iommu->ecap)) {
printk(KERN_ERR
"Requested mask %x exceeds the max invalidation handle"
" mask value %Lx\n", mask,
ecap_max_handle_mask(iommu->ecap));
return -1;
}
spin_lock(&irq_2_ir_lock);
do {
for (i = index; i < index + count; i++)
if (table->base[i].present)
break;
/* empty index found */
if (i == index + count)
break;
index = (index + count) % INTR_REMAP_TABLE_ENTRIES;
if (index == start_index) {
spin_unlock(&irq_2_ir_lock);
printk(KERN_ERR "can't allocate an IRTE\n");
return -1;
}
} while (1);
for (i = index; i < index + count; i++)
table->base[i].present = 1;
irq_2_iommu[irq].iommu = iommu;
irq_2_iommu[irq].irte_index = index;
irq_2_iommu[irq].sub_handle = 0;
irq_2_iommu[irq].irte_mask = mask;
spin_unlock(&irq_2_ir_lock);
return index;
}
static void qi_flush_iec(struct intel_iommu *iommu, int index, int mask)
{
struct qi_desc desc;
desc.low = QI_IEC_IIDEX(index) | QI_IEC_TYPE | QI_IEC_IM(mask)
| QI_IEC_SELECTIVE;
desc.high = 0;
qi_submit_sync(&desc, iommu);
}
int map_irq_to_irte_handle(int irq, u16 *sub_handle)
{
int index;
spin_lock(&irq_2_ir_lock);
if (irq >= NR_IRQS || !irq_2_iommu[irq].iommu) {
spin_unlock(&irq_2_ir_lock);
return -1;
}
*sub_handle = irq_2_iommu[irq].sub_handle;
index = irq_2_iommu[irq].irte_index;
spin_unlock(&irq_2_ir_lock);
return index;
}
int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index, u16 subhandle)
{
spin_lock(&irq_2_ir_lock);
if (irq >= NR_IRQS || irq_2_iommu[irq].iommu) {
spin_unlock(&irq_2_ir_lock);
return -1;
}
irq_2_iommu[irq].iommu = iommu;
irq_2_iommu[irq].irte_index = index;
irq_2_iommu[irq].sub_handle = subhandle;
irq_2_iommu[irq].irte_mask = 0;
spin_unlock(&irq_2_ir_lock);
return 0;
}
int clear_irte_irq(int irq, struct intel_iommu *iommu, u16 index)
{
spin_lock(&irq_2_ir_lock);
if (irq >= NR_IRQS || !irq_2_iommu[irq].iommu) {
spin_unlock(&irq_2_ir_lock);
return -1;
}
irq_2_iommu[irq].iommu = NULL;
irq_2_iommu[irq].irte_index = 0;
irq_2_iommu[irq].sub_handle = 0;
irq_2_iommu[irq].irte_mask = 0;
spin_unlock(&irq_2_ir_lock);
return 0;
}
int modify_irte(int irq, struct irte *irte_modified)
{
int index;
struct irte *irte;
struct intel_iommu *iommu;
spin_lock(&irq_2_ir_lock);
if (irq >= NR_IRQS || !irq_2_iommu[irq].iommu) {
spin_unlock(&irq_2_ir_lock);
return -1;
}
iommu = irq_2_iommu[irq].iommu;
index = irq_2_iommu[irq].irte_index + irq_2_iommu[irq].sub_handle;
irte = &iommu->ir_table->base[index];
set_64bit((unsigned long *)irte, irte_modified->low | (1 << 1));
__iommu_flush_cache(iommu, irte, sizeof(*irte));
qi_flush_iec(iommu, index, 0);
spin_unlock(&irq_2_ir_lock);
return 0;
}
int flush_irte(int irq)
{
int index;
struct intel_iommu *iommu;
spin_lock(&irq_2_ir_lock);
if (irq >= NR_IRQS || !irq_2_iommu[irq].iommu) {
spin_unlock(&irq_2_ir_lock);
return -1;
}
iommu = irq_2_iommu[irq].iommu;
index = irq_2_iommu[irq].irte_index + irq_2_iommu[irq].sub_handle;
qi_flush_iec(iommu, index, irq_2_iommu[irq].irte_mask);
spin_unlock(&irq_2_ir_lock);
return 0;
}
struct intel_iommu *map_ioapic_to_ir(int apic)
{
int i;
for (i = 0; i < MAX_IO_APICS; i++)
if (ir_ioapic[i].id == apic)
return ir_ioapic[i].iommu;
return NULL;
}
struct intel_iommu *map_dev_to_ir(struct pci_dev *dev)
{
struct dmar_drhd_unit *drhd;
drhd = dmar_find_matched_drhd_unit(dev);
if (!drhd)
return NULL;
return drhd->iommu;
}
int free_irte(int irq)
{
int index, i;
struct irte *irte;
struct intel_iommu *iommu;
spin_lock(&irq_2_ir_lock);
if (irq >= NR_IRQS || !irq_2_iommu[irq].iommu) {
spin_unlock(&irq_2_ir_lock);
return -1;
}
iommu = irq_2_iommu[irq].iommu;
index = irq_2_iommu[irq].irte_index + irq_2_iommu[irq].sub_handle;
irte = &iommu->ir_table->base[index];
if (!irq_2_iommu[irq].sub_handle) {
for (i = 0; i < (1 << irq_2_iommu[irq].irte_mask); i++)
set_64bit((unsigned long *)irte, 0);
qi_flush_iec(iommu, index, irq_2_iommu[irq].irte_mask);
}
irq_2_iommu[irq].iommu = NULL;
irq_2_iommu[irq].irte_index = 0;
irq_2_iommu[irq].sub_handle = 0;
irq_2_iommu[irq].irte_mask = 0;
spin_unlock(&irq_2_ir_lock);
return 0;
}
static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode)
{
u64 addr;
u32 cmd, sts;
unsigned long flags;
addr = virt_to_phys((void *)iommu->ir_table->base);
spin_lock_irqsave(&iommu->register_lock, flags);
dmar_writeq(iommu->reg + DMAR_IRTA_REG,
(addr) | IR_X2APIC_MODE(mode) | INTR_REMAP_TABLE_REG_SIZE);
/* Set interrupt-remapping table pointer */
cmd = iommu->gcmd | DMA_GCMD_SIRTP;
writel(cmd, iommu->reg + DMAR_GCMD_REG);
IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
readl, (sts & DMA_GSTS_IRTPS), sts);
spin_unlock_irqrestore(&iommu->register_lock, flags);
/*
* global invalidation of interrupt entry cache before enabling
* interrupt-remapping.
*/
qi_global_iec(iommu);
spin_lock_irqsave(&iommu->register_lock, flags);
/* Enable interrupt-remapping */
cmd = iommu->gcmd | DMA_GCMD_IRE;
iommu->gcmd |= DMA_GCMD_IRE;
writel(cmd, iommu->reg + DMAR_GCMD_REG);
IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
readl, (sts & DMA_GSTS_IRES), sts);
spin_unlock_irqrestore(&iommu->register_lock, flags);
}
static int setup_intr_remapping(struct intel_iommu *iommu, int mode)
{
struct ir_table *ir_table;
struct page *pages;
ir_table = iommu->ir_table = kzalloc(sizeof(struct ir_table),
GFP_KERNEL);
if (!iommu->ir_table)
return -ENOMEM;
pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, INTR_REMAP_PAGE_ORDER);
if (!pages) {
printk(KERN_ERR "failed to allocate pages of order %d\n",
INTR_REMAP_PAGE_ORDER);
kfree(iommu->ir_table);
return -ENOMEM;
}
ir_table->base = page_address(pages);
iommu_set_intr_remapping(iommu, mode);
return 0;
}
int __init enable_intr_remapping(int eim)
{
struct dmar_drhd_unit *drhd;
int setup = 0;
/*
* check for the Interrupt-remapping support
*/
for_each_drhd_unit(drhd) {
struct intel_iommu *iommu = drhd->iommu;
if (!ecap_ir_support(iommu->ecap))
continue;
if (eim && !ecap_eim_support(iommu->ecap)) {
printk(KERN_INFO "DRHD %Lx: EIM not supported by DRHD, "
" ecap %Lx\n", drhd->reg_base_addr, iommu->ecap);
return -1;
}
}
/*
* Enable queued invalidation for all the DRHD's.
*/
for_each_drhd_unit(drhd) {
int ret;
struct intel_iommu *iommu = drhd->iommu;
ret = dmar_enable_qi(iommu);
if (ret) {
printk(KERN_ERR "DRHD %Lx: failed to enable queued, "
" invalidation, ecap %Lx, ret %d\n",
drhd->reg_base_addr, iommu->ecap, ret);
return -1;
}
}
/*
* Setup Interrupt-remapping for all the DRHD's now.
*/
for_each_drhd_unit(drhd) {
struct intel_iommu *iommu = drhd->iommu;
if (!ecap_ir_support(iommu->ecap))
continue;
if (setup_intr_remapping(iommu, eim))
goto error;
setup = 1;
}
if (!setup)
goto error;
intr_remapping_enabled = 1;
return 0;
error:
/*
* handle error condition gracefully here!
*/
return -1;
}
static int ir_parse_ioapic_scope(struct acpi_dmar_header *header,
struct intel_iommu *iommu)
{
struct acpi_dmar_hardware_unit *drhd;
struct acpi_dmar_device_scope *scope;
void *start, *end;
drhd = (struct acpi_dmar_hardware_unit *)header;
start = (void *)(drhd + 1);
end = ((void *)drhd) + header->length;
while (start < end) {
scope = start;
if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_IOAPIC) {
if (ir_ioapic_num == MAX_IO_APICS) {
printk(KERN_WARNING "Exceeded Max IO APICS\n");
return -1;
}
printk(KERN_INFO "IOAPIC id %d under DRHD base"
" 0x%Lx\n", scope->enumeration_id,
drhd->address);
ir_ioapic[ir_ioapic_num].iommu = iommu;
ir_ioapic[ir_ioapic_num].id = scope->enumeration_id;
ir_ioapic_num++;
}
start += scope->length;
}
return 0;
}
/*
* Finds the assocaition between IOAPIC's and its Interrupt-remapping
* hardware unit.
*/
int __init parse_ioapics_under_ir(void)
{
struct dmar_drhd_unit *drhd;
int ir_supported = 0;
for_each_drhd_unit(drhd) {
struct intel_iommu *iommu = drhd->iommu;
if (ecap_ir_support(iommu->ecap)) {
if (ir_parse_ioapic_scope(drhd->hdr, iommu))
return -1;
ir_supported = 1;
}
}
if (ir_supported && ir_ioapic_num != nr_ioapics) {
printk(KERN_WARNING
"Not all IO-APIC's listed under remapping hardware\n");
return -1;
}
return ir_supported;
}