[linux.git] / drivers / pci / intr_remapping.c

#include <linux/interrupt.h>
#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 <asm/smp.h>
#include <asm/cpu.h>
#include <linux/intel-iommu.h>
#include "intr_remapping.h"
#include <acpi/acpi.h>

static struct ioapic_scope ir_ioapic[MAX_IO_APICS];
static int ir_ioapic_num;
int intr_remapping_enabled;

static int disable_intremap;
static __init int setup_nointremap(char *str)
{
	disable_intremap = 1;
	return 0;
}
early_param("nointremap", setup_nointremap);

struct irq_2_iommu {
	struct intel_iommu *iommu;
	u16 irte_index;
	u16 sub_handle;
	u8  irte_mask;
};

#ifdef CONFIG_GENERIC_HARDIRQS
static struct irq_2_iommu *get_one_free_irq_2_iommu(int node)
{
	struct irq_2_iommu *iommu;

	iommu = kzalloc_node(sizeof(*iommu), GFP_ATOMIC, node);
	printk(KERN_DEBUG "alloc irq_2_iommu on node %d\n", node);

	return iommu;
}

static struct irq_2_iommu *irq_2_iommu(unsigned int irq)
{
	struct irq_desc *desc;

	desc = irq_to_desc(irq);

	if (WARN_ON_ONCE(!desc))
		return NULL;

	return desc->irq_2_iommu;
}

static struct irq_2_iommu *irq_2_iommu_alloc_node(unsigned int irq, int node)
{
	struct irq_desc *desc;
	struct irq_2_iommu *irq_iommu;

	/*
	 * alloc irq desc if not allocated already.
	 */
	desc = irq_to_desc_alloc_node(irq, node);
	if (!desc) {
		printk(KERN_INFO "can not get irq_desc for %d\n", irq);
		return NULL;
	}

	irq_iommu = desc->irq_2_iommu;

	if (!irq_iommu)
		desc->irq_2_iommu = get_one_free_irq_2_iommu(node);

	return desc->irq_2_iommu;
}

static struct irq_2_iommu *irq_2_iommu_alloc(unsigned int irq)
{
	return irq_2_iommu_alloc_node(irq, cpu_to_node(boot_cpu_id));
}

#else /* !CONFIG_SPARSE_IRQ */

static struct irq_2_iommu irq_2_iommuX[NR_IRQS];

static struct irq_2_iommu *irq_2_iommu(unsigned int irq)
{
	if (irq < nr_irqs)
		return &irq_2_iommuX[irq];

	return NULL;
}
static struct irq_2_iommu *irq_2_iommu_alloc(unsigned int irq)
{
	return irq_2_iommu(irq);
}
#endif

static DEFINE_SPINLOCK(irq_2_ir_lock);

static struct irq_2_iommu *valid_irq_2_iommu(unsigned int irq)
{
	struct irq_2_iommu *irq_iommu;

	irq_iommu = irq_2_iommu(irq);

	if (!irq_iommu)
		return NULL;

	if (!irq_iommu->iommu)
		return NULL;

	return irq_iommu;
}

int irq_remapped(int irq)
{
	return valid_irq_2_iommu(irq) != NULL;
}

int get_irte(int irq, struct irte *entry)
{
	int index;
	struct irq_2_iommu *irq_iommu;
	unsigned long flags;

	if (!entry)
		return -1;

	spin_lock_irqsave(&irq_2_ir_lock, flags);
	irq_iommu = valid_irq_2_iommu(irq);
	if (!irq_iommu) {
		spin_unlock_irqrestore(&irq_2_ir_lock, flags);
		return -1;
	}

	index = irq_iommu->irte_index + irq_iommu->sub_handle;
	*entry = *(irq_iommu->iommu->ir_table->base + index);

	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
	return 0;
}

int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
{
	struct ir_table *table = iommu->ir_table;
	struct irq_2_iommu *irq_iommu;
	u16 index, start_index;
	unsigned int mask = 0;
	unsigned long flags;
	int i;

	if (!count)
		return -1;

#ifndef CONFIG_SPARSE_IRQ
	/* protect irq_2_iommu_alloc later */
	if (irq >= nr_irqs)
		return -1;
#endif

	/*
	 * 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_irqsave(&irq_2_ir_lock, flags);
	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_irqrestore(&irq_2_ir_lock, flags);
			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_iommu = irq_2_iommu_alloc(irq);
	if (!irq_iommu) {
		spin_unlock_irqrestore(&irq_2_ir_lock, flags);
		printk(KERN_ERR "can't allocate irq_2_iommu\n");
		return -1;
	}

	irq_iommu->iommu = iommu;
	irq_iommu->irte_index =  index;
	irq_iommu->sub_handle = 0;
	irq_iommu->irte_mask = mask;

	spin_unlock_irqrestore(&irq_2_ir_lock, flags);

	return index;
}

static int 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;

	return qi_submit_sync(&desc, iommu);
}

int map_irq_to_irte_handle(int irq, u16 *sub_handle)
{
	int index;
	struct irq_2_iommu *irq_iommu;
	unsigned long flags;

	spin_lock_irqsave(&irq_2_ir_lock, flags);
	irq_iommu = valid_irq_2_iommu(irq);
	if (!irq_iommu) {
		spin_unlock_irqrestore(&irq_2_ir_lock, flags);
		return -1;
	}

	*sub_handle = irq_iommu->sub_handle;
	index = irq_iommu->irte_index;
	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
	return index;
}

int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index, u16 subhandle)
{
	struct irq_2_iommu *irq_iommu;
	unsigned long flags;

	spin_lock_irqsave(&irq_2_ir_lock, flags);

	irq_iommu = irq_2_iommu_alloc(irq);

	if (!irq_iommu) {
		spin_unlock_irqrestore(&irq_2_ir_lock, flags);
		printk(KERN_ERR "can't allocate irq_2_iommu\n");
		return -1;
	}

	irq_iommu->iommu = iommu;
	irq_iommu->irte_index = index;
	irq_iommu->sub_handle = subhandle;
	irq_iommu->irte_mask = 0;

	spin_unlock_irqrestore(&irq_2_ir_lock, flags);

	return 0;
}

int clear_irte_irq(int irq, struct intel_iommu *iommu, u16 index)
{
	struct irq_2_iommu *irq_iommu;
	unsigned long flags;

	spin_lock_irqsave(&irq_2_ir_lock, flags);
	irq_iommu = valid_irq_2_iommu(irq);
	if (!irq_iommu) {
		spin_unlock_irqrestore(&irq_2_ir_lock, flags);
		return -1;
	}

	irq_iommu->iommu = NULL;
	irq_iommu->irte_index = 0;
	irq_iommu->sub_handle = 0;
	irq_2_iommu(irq)->irte_mask = 0;

	spin_unlock_irqrestore(&irq_2_ir_lock, flags);

	return 0;
}

int modify_irte(int irq, struct irte *irte_modified)
{
	int rc;
	int index;
	struct irte *irte;
	struct intel_iommu *iommu;
	struct irq_2_iommu *irq_iommu;
	unsigned long flags;

	spin_lock_irqsave(&irq_2_ir_lock, flags);
	irq_iommu = valid_irq_2_iommu(irq);
	if (!irq_iommu) {
		spin_unlock_irqrestore(&irq_2_ir_lock, flags);
		return -1;
	}

	iommu = irq_iommu->iommu;

	index = irq_iommu->irte_index + irq_iommu->sub_handle;
	irte = &iommu->ir_table->base[index];

	set_64bit((unsigned long *)&irte->low, irte_modified->low);
	set_64bit((unsigned long *)&irte->high, irte_modified->high);
	__iommu_flush_cache(iommu, irte, sizeof(*irte));

	rc = qi_flush_iec(iommu, index, 0);
	spin_unlock_irqrestore(&irq_2_ir_lock, flags);

	return rc;
}

int flush_irte(int irq)
{
	int rc;
	int index;
	struct intel_iommu *iommu;
	struct irq_2_iommu *irq_iommu;
	unsigned long flags;

	spin_lock_irqsave(&irq_2_ir_lock, flags);
	irq_iommu = valid_irq_2_iommu(irq);
	if (!irq_iommu) {
		spin_unlock_irqrestore(&irq_2_ir_lock, flags);
		return -1;
	}

	iommu = irq_iommu->iommu;

	index = irq_iommu->irte_index + irq_iommu->sub_handle;

	rc = qi_flush_iec(iommu, index, irq_iommu->irte_mask);
	spin_unlock_irqrestore(&irq_2_ir_lock, flags);

	return rc;
}

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;
}

static int clear_entries(struct irq_2_iommu *irq_iommu)
{
	struct irte *start, *entry, *end;
	struct intel_iommu *iommu;
	int index;

	if (irq_iommu->sub_handle)
		return 0;

	iommu = irq_iommu->iommu;
	index = irq_iommu->irte_index + irq_iommu->sub_handle;

	start = iommu->ir_table->base + index;
	end = start + (1 << irq_iommu->irte_mask);

	for (entry = start; entry < end; entry++) {
		set_64bit((unsigned long *)&entry->low, 0);
		set_64bit((unsigned long *)&entry->high, 0);
	}

	return qi_flush_iec(iommu, index, irq_iommu->irte_mask);
}

int free_irte(int irq)
{
	int rc = 0;
	struct irq_2_iommu *irq_iommu;
	unsigned long flags;

	spin_lock_irqsave(&irq_2_ir_lock, flags);
	irq_iommu = valid_irq_2_iommu(irq);
	if (!irq_iommu) {
		spin_unlock_irqrestore(&irq_2_ir_lock, flags);
		return -1;
	}

	rc = clear_entries(irq_iommu);

	irq_iommu->iommu = NULL;
	irq_iommu->irte_index = 0;
	irq_iommu->sub_handle = 0;
	irq_iommu->irte_mask = 0;

	spin_unlock_irqrestore(&irq_2_ir_lock, flags);

	return rc;
}

static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode)
{
	u64 addr;
	u32 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 */
	iommu->gcmd |= DMA_GCMD_SIRTP;
	writel(iommu->gcmd, 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 */
	iommu->gcmd |= DMA_GCMD_IRE;
	writel(iommu->gcmd, 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_ATOMIC);

	if (!iommu->ir_table)
		return -ENOMEM;

	pages = alloc_pages(GFP_ATOMIC | __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;
}

/*
 * Disable Interrupt Remapping.
 */
static void iommu_disable_intr_remapping(struct intel_iommu *iommu)
{
	unsigned long flags;
	u32 sts;

	if (!ecap_ir_support(iommu->ecap))
		return;

	/*
	 * global invalidation of interrupt entry cache before disabling
	 * interrupt-remapping.
	 */
	qi_global_iec(iommu);

	spin_lock_irqsave(&iommu->register_lock, flags);

	sts = dmar_readq(iommu->reg + DMAR_GSTS_REG);
	if (!(sts & DMA_GSTS_IRES))
		goto end;

	iommu->gcmd &= ~DMA_GCMD_IRE;
	writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);

	IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
		      readl, !(sts & DMA_GSTS_IRES), sts);

end:
	spin_unlock_irqrestore(&iommu->register_lock, flags);
}

int __init intr_remapping_supported(void)
{
	struct dmar_drhd_unit *drhd;

	if (disable_intremap)
		return 0;

	for_each_drhd_unit(drhd) {
		struct intel_iommu *iommu = drhd->iommu;

		if (!ecap_ir_support(iommu->ecap))
			return 0;
	}

	return 1;
}

int __init enable_intr_remapping(int eim)
{
	struct dmar_drhd_unit *drhd;
	int setup = 0;

	for_each_drhd_unit(drhd) {
		struct intel_iommu *iommu = drhd->iommu;

		/*
		 * If the queued invalidation is already initialized,
		 * shouldn't disable it.
		 */
		if (iommu->qi)
			continue;

		/*
		 * Clear previous faults.
		 */
		dmar_fault(-1, iommu);

		/*
		 * Disable intr remapping and queued invalidation, if already
		 * enabled prior to OS handover.
		 */
		iommu_disable_intr_remapping(iommu);

		dmar_disable_qi(iommu);
	}

	/*
	 * 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;
}

void disable_intr_remapping(void)
{
	struct dmar_drhd_unit *drhd;
	struct intel_iommu *iommu = NULL;

	/*
	 * Disable Interrupt-remapping for all the DRHD's now.
	 */
	for_each_iommu(iommu, drhd) {
		if (!ecap_ir_support(iommu->ecap))
			continue;

		iommu_disable_intr_remapping(iommu);
	}
}

int reenable_intr_remapping(int eim)
{
	struct dmar_drhd_unit *drhd;
	int setup = 0;
	struct intel_iommu *iommu = NULL;

	for_each_iommu(iommu, drhd)
		if (iommu->qi)
			dmar_reenable_qi(iommu);

	/*
	 * Setup Interrupt-remapping for all the DRHD's now.
	 */
	for_each_iommu(iommu, drhd) {
		if (!ecap_ir_support(iommu->ecap))
			continue;

		/* Set up interrupt remapping for iommu.*/
		iommu_set_intr_remapping(iommu, eim);
		setup = 1;
	}

	if (!setup)
		goto error;

	return 0;

error:
	/*
	 * handle error condition gracefully here!
	 */
	return -1;
}
Commit	Line	Data
5aeecaf4	1	#include <linux/interrupt.h>
ad3ad3f6	2	#include <linux/dmar.h>
2ae21010 SS	3	#include <linux/spinlock.h>
	4	#include <linux/jiffies.h>
	5	#include <linux/pci.h>
b6fcb33a	6	#include <linux/irq.h>
ad3ad3f6	7	#include <asm/io_apic.h>
17483a1f	8	#include <asm/smp.h>
6d652ea1	9	#include <asm/cpu.h>
38717946	10	#include <linux/intel-iommu.h>
ad3ad3f6	11	#include "intr_remapping.h"
46f06b72	12	#include <acpi/acpi.h>
ad3ad3f6 SS	13
	14	static struct ioapic_scope ir_ioapic[MAX_IO_APICS];
	15	static int ir_ioapic_num;
2ae21010 SS	16	int intr_remapping_enabled;
2ae21010 SS	17
03ea8155 WH	18	static int disable_intremap;
	19	static __init int setup_nointremap(char *str)
	20	{
	21	disable_intremap = 1;
	22	return 0;
	23	}
	24	early_param("nointremap", setup_nointremap);
	25
5aeecaf4	26	struct irq_2_iommu {
b6fcb33a SS	27	struct intel_iommu *iommu;
	28	u16 irte_index;
	29	u16 sub_handle;
	30	u8 irte_mask;
5aeecaf4 YL	31	};
5aeecaf4 YL	32
d7e51e66	33	#ifdef CONFIG_GENERIC_HARDIRQS
85ac16d0	34	static struct irq_2_iommu *get_one_free_irq_2_iommu(int node)
0b8f1efa YL	35	{
0b8f1efa YL	36	struct irq_2_iommu *iommu;
0b8f1efa YL	37
0b8f1efa YL	38	iommu = kzalloc_node(sizeof(*iommu), GFP_ATOMIC, node);
85ac16d0	39	printk(KERN_DEBUG "alloc irq_2_iommu on node %d\n", node);
0b8f1efa YL	40
	41	return iommu;
	42	}
e420dfb4 YL	43
	44	static struct irq_2_iommu *irq_2_iommu(unsigned int irq)
	45	{
0b8f1efa YL	46	struct irq_desc *desc;
	47
	48	desc = irq_to_desc(irq);
	49
	50	if (WARN_ON_ONCE(!desc))
	51	return NULL;
	52
	53	return desc->irq_2_iommu;
	54	}
	55
85ac16d0	56	static struct irq_2_iommu *irq_2_iommu_alloc_node(unsigned int irq, int node)
0b8f1efa YL	57	{
	58	struct irq_desc *desc;
	59	struct irq_2_iommu *irq_iommu;
	60
	61	/*
	62	* alloc irq desc if not allocated already.
	63	*/
85ac16d0	64	desc = irq_to_desc_alloc_node(irq, node);
0b8f1efa YL	65	if (!desc) {
	66	printk(KERN_INFO "can not get irq_desc for %d\n", irq);
	67	return NULL;
	68	}
	69
	70	irq_iommu = desc->irq_2_iommu;
	71
	72	if (!irq_iommu)
85ac16d0	73	desc->irq_2_iommu = get_one_free_irq_2_iommu(node);
0b8f1efa YL	74
	75	return desc->irq_2_iommu;
	76	}
	77
	78	static struct irq_2_iommu *irq_2_iommu_alloc(unsigned int irq)
	79	{
85ac16d0	80	return irq_2_iommu_alloc_node(irq, cpu_to_node(boot_cpu_id));
e420dfb4	81	}
d6c88a50	82
0b8f1efa YL	83	#else /* !CONFIG_SPARSE_IRQ */
	84
	85	static struct irq_2_iommu irq_2_iommuX[NR_IRQS];
	86
	87	static struct irq_2_iommu *irq_2_iommu(unsigned int irq)
	88	{
	89	if (irq < nr_irqs)
	90	return &irq_2_iommuX[irq];
	91
	92	return NULL;
	93	}
e420dfb4 YL	94	static struct irq_2_iommu *irq_2_iommu_alloc(unsigned int irq)
	95	{
	96	return irq_2_iommu(irq);
	97	}
0b8f1efa	98	#endif
b6fcb33a SS	99
	100	static DEFINE_SPINLOCK(irq_2_ir_lock);
	101
e420dfb4	102	static struct irq_2_iommu *valid_irq_2_iommu(unsigned int irq)
b6fcb33a	103	{
e420dfb4 YL	104	struct irq_2_iommu *irq_iommu;
	105
	106	irq_iommu = irq_2_iommu(irq);
b6fcb33a	107
e420dfb4 YL	108	if (!irq_iommu)
e420dfb4 YL	109	return NULL;
b6fcb33a	110
e420dfb4 YL	111	if (!irq_iommu->iommu)
e420dfb4 YL	112	return NULL;
b6fcb33a	113
e420dfb4 YL	114	return irq_iommu;
e420dfb4 YL	115	}
b6fcb33a	116
e420dfb4 YL	117	int irq_remapped(int irq)
	118	{
	119	return valid_irq_2_iommu(irq) != NULL;
b6fcb33a SS	120	}
	121
	122	int get_irte(int irq, struct irte *entry)
	123	{
	124	int index;
e420dfb4	125	struct irq_2_iommu *irq_iommu;
4c5502b1	126	unsigned long flags;
b6fcb33a	127
e420dfb4	128	if (!entry)
b6fcb33a SS	129	return -1;
b6fcb33a SS	130
4c5502b1	131	spin_lock_irqsave(&irq_2_ir_lock, flags);
e420dfb4 YL	132	irq_iommu = valid_irq_2_iommu(irq);
e420dfb4 YL	133	if (!irq_iommu) {
4c5502b1	134	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
b6fcb33a SS	135	return -1;
	136	}
	137
e420dfb4 YL	138	index = irq_iommu->irte_index + irq_iommu->sub_handle;
e420dfb4 YL	139	entry = (irq_iommu->iommu->ir_table->base + index);
b6fcb33a	140
4c5502b1	141	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
b6fcb33a SS	142	return 0;
	143	}
	144
	145	int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
	146	{
	147	struct ir_table *table = iommu->ir_table;
e420dfb4	148	struct irq_2_iommu *irq_iommu;
b6fcb33a SS	149	u16 index, start_index;
b6fcb33a SS	150	unsigned int mask = 0;
4c5502b1	151	unsigned long flags;
b6fcb33a SS	152	int i;
	153
	154	if (!count)
	155	return -1;
	156
0b8f1efa	157	#ifndef CONFIG_SPARSE_IRQ
e420dfb4 YL	158	/* protect irq_2_iommu_alloc later */
	159	if (irq >= nr_irqs)
	160	return -1;
0b8f1efa	161	#endif
e420dfb4	162
b6fcb33a SS	163	/*
	164	* start the IRTE search from index 0.
	165	*/
	166	index = start_index = 0;
	167
	168	if (count > 1) {
	169	count = __roundup_pow_of_two(count);
	170	mask = ilog2(count);
	171	}
	172
	173	if (mask > ecap_max_handle_mask(iommu->ecap)) {
	174	printk(KERN_ERR
	175	"Requested mask %x exceeds the max invalidation handle"
	176	" mask value %Lx\n", mask,
	177	ecap_max_handle_mask(iommu->ecap));
	178	return -1;
	179	}
	180
4c5502b1	181	spin_lock_irqsave(&irq_2_ir_lock, flags);
b6fcb33a SS	182	do {
	183	for (i = index; i < index + count; i++)
	184	if (table->base[i].present)
	185	break;
	186	/* empty index found */
	187	if (i == index + count)
	188	break;
	189
	190	index = (index + count) % INTR_REMAP_TABLE_ENTRIES;
	191
	192	if (index == start_index) {
4c5502b1	193	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
b6fcb33a SS	194	printk(KERN_ERR "can't allocate an IRTE\n");
	195	return -1;
	196	}
	197	} while (1);
	198
	199	for (i = index; i < index + count; i++)
	200	table->base[i].present = 1;
	201
e420dfb4	202	irq_iommu = irq_2_iommu_alloc(irq);
0b8f1efa	203	if (!irq_iommu) {
4c5502b1	204	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
0b8f1efa YL	205	printk(KERN_ERR "can't allocate irq_2_iommu\n");
	206	return -1;
	207	}
	208
e420dfb4 YL	209	irq_iommu->iommu = iommu;
	210	irq_iommu->irte_index = index;
	211	irq_iommu->sub_handle = 0;
	212	irq_iommu->irte_mask = mask;
b6fcb33a	213
4c5502b1	214	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
b6fcb33a SS	215
	216	return index;
	217	}
	218
704126ad	219	static int qi_flush_iec(struct intel_iommu *iommu, int index, int mask)
b6fcb33a SS	220	{
	221	struct qi_desc desc;
	222
	223	desc.low = QI_IEC_IIDEX(index) \| QI_IEC_TYPE \| QI_IEC_IM(mask)
	224	\| QI_IEC_SELECTIVE;
	225	desc.high = 0;
	226
704126ad	227	return qi_submit_sync(&desc, iommu);
b6fcb33a SS	228	}
	229
	230	int map_irq_to_irte_handle(int irq, u16 *sub_handle)
	231	{
	232	int index;
e420dfb4	233	struct irq_2_iommu *irq_iommu;
4c5502b1	234	unsigned long flags;
b6fcb33a	235
4c5502b1	236	spin_lock_irqsave(&irq_2_ir_lock, flags);
e420dfb4 YL	237	irq_iommu = valid_irq_2_iommu(irq);
e420dfb4 YL	238	if (!irq_iommu) {
4c5502b1	239	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
b6fcb33a SS	240	return -1;
	241	}
	242
e420dfb4 YL	243	*sub_handle = irq_iommu->sub_handle;
e420dfb4 YL	244	index = irq_iommu->irte_index;
4c5502b1	245	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
b6fcb33a SS	246	return index;
	247	}
	248
	249	int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index, u16 subhandle)
	250	{
e420dfb4	251	struct irq_2_iommu *irq_iommu;
4c5502b1	252	unsigned long flags;
e420dfb4	253
4c5502b1	254	spin_lock_irqsave(&irq_2_ir_lock, flags);
b6fcb33a	255
7ddfb650	256	irq_iommu = irq_2_iommu_alloc(irq);
b6fcb33a	257
0b8f1efa	258	if (!irq_iommu) {
4c5502b1	259	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
0b8f1efa YL	260	printk(KERN_ERR "can't allocate irq_2_iommu\n");
	261	return -1;
	262	}
	263
e420dfb4 YL	264	irq_iommu->iommu = iommu;
	265	irq_iommu->irte_index = index;
	266	irq_iommu->sub_handle = subhandle;
	267	irq_iommu->irte_mask = 0;
b6fcb33a	268
4c5502b1	269	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
b6fcb33a SS	270
	271	return 0;
	272	}
	273
	274	int clear_irte_irq(int irq, struct intel_iommu *iommu, u16 index)
	275	{
e420dfb4	276	struct irq_2_iommu *irq_iommu;
4c5502b1	277	unsigned long flags;
e420dfb4	278
4c5502b1	279	spin_lock_irqsave(&irq_2_ir_lock, flags);
e420dfb4 YL	280	irq_iommu = valid_irq_2_iommu(irq);
e420dfb4 YL	281	if (!irq_iommu) {
4c5502b1	282	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
b6fcb33a SS	283	return -1;
	284	}
	285
e420dfb4 YL	286	irq_iommu->iommu = NULL;
	287	irq_iommu->irte_index = 0;
	288	irq_iommu->sub_handle = 0;
	289	irq_2_iommu(irq)->irte_mask = 0;
b6fcb33a	290
4c5502b1	291	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
b6fcb33a SS	292
	293	return 0;
	294	}
	295
	296	int modify_irte(int irq, struct irte *irte_modified)
	297	{
704126ad	298	int rc;
b6fcb33a SS	299	int index;
	300	struct irte *irte;
	301	struct intel_iommu *iommu;
e420dfb4	302	struct irq_2_iommu *irq_iommu;
4c5502b1	303	unsigned long flags;
b6fcb33a	304
4c5502b1	305	spin_lock_irqsave(&irq_2_ir_lock, flags);
e420dfb4 YL	306	irq_iommu = valid_irq_2_iommu(irq);
e420dfb4 YL	307	if (!irq_iommu) {
4c5502b1	308	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
b6fcb33a SS	309	return -1;
	310	}
	311
e420dfb4	312	iommu = irq_iommu->iommu;
b6fcb33a	313
e420dfb4	314	index = irq_iommu->irte_index + irq_iommu->sub_handle;
b6fcb33a SS	315	irte = &iommu->ir_table->base[index];
b6fcb33a SS	316
c4658b4e WH	317	set_64bit((unsigned long *)&irte->low, irte_modified->low);
c4658b4e WH	318	set_64bit((unsigned long *)&irte->high, irte_modified->high);
b6fcb33a SS	319	__iommu_flush_cache(iommu, irte, sizeof(*irte));
b6fcb33a SS	320
704126ad	321	rc = qi_flush_iec(iommu, index, 0);
4c5502b1	322	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
704126ad YZ	323
704126ad YZ	324	return rc;
b6fcb33a SS	325	}
	326
	327	int flush_irte(int irq)
	328	{
704126ad	329	int rc;
b6fcb33a SS	330	int index;
b6fcb33a SS	331	struct intel_iommu *iommu;
e420dfb4	332	struct irq_2_iommu *irq_iommu;
4c5502b1	333	unsigned long flags;
b6fcb33a	334
4c5502b1	335	spin_lock_irqsave(&irq_2_ir_lock, flags);
e420dfb4 YL	336	irq_iommu = valid_irq_2_iommu(irq);
e420dfb4 YL	337	if (!irq_iommu) {
4c5502b1	338	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
b6fcb33a SS	339	return -1;
	340	}
	341
e420dfb4	342	iommu = irq_iommu->iommu;
b6fcb33a	343
e420dfb4	344	index = irq_iommu->irte_index + irq_iommu->sub_handle;
b6fcb33a	345
704126ad	346	rc = qi_flush_iec(iommu, index, irq_iommu->irte_mask);
4c5502b1	347	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
b6fcb33a	348
704126ad	349	return rc;
b6fcb33a SS	350	}
b6fcb33a SS	351
89027d35 SS	352	struct intel_iommu *map_ioapic_to_ir(int apic)
	353	{
	354	int i;
	355
	356	for (i = 0; i < MAX_IO_APICS; i++)
	357	if (ir_ioapic[i].id == apic)
	358	return ir_ioapic[i].iommu;
	359	return NULL;
	360	}
	361
75c46fa6 SS	362	struct intel_iommu map_dev_to_ir(struct pci_dev dev)
	363	{
	364	struct dmar_drhd_unit *drhd;
	365
	366	drhd = dmar_find_matched_drhd_unit(dev);
	367	if (!drhd)
	368	return NULL;
	369
	370	return drhd->iommu;
	371	}
	372
c4658b4e WH	373	static int clear_entries(struct irq_2_iommu *irq_iommu)
	374	{
	375	struct irte start, entry, *end;
	376	struct intel_iommu *iommu;
	377	int index;
	378
	379	if (irq_iommu->sub_handle)
	380	return 0;
	381
	382	iommu = irq_iommu->iommu;
	383	index = irq_iommu->irte_index + irq_iommu->sub_handle;
	384
	385	start = iommu->ir_table->base + index;
	386	end = start + (1 << irq_iommu->irte_mask);
	387
	388	for (entry = start; entry < end; entry++) {
	389	set_64bit((unsigned long *)&entry->low, 0);
	390	set_64bit((unsigned long *)&entry->high, 0);
	391	}
	392
	393	return qi_flush_iec(iommu, index, irq_iommu->irte_mask);
	394	}
	395
b6fcb33a SS	396	int free_irte(int irq)
b6fcb33a SS	397	{
704126ad	398	int rc = 0;
e420dfb4	399	struct irq_2_iommu *irq_iommu;
4c5502b1	400	unsigned long flags;
b6fcb33a	401
4c5502b1	402	spin_lock_irqsave(&irq_2_ir_lock, flags);
e420dfb4 YL	403	irq_iommu = valid_irq_2_iommu(irq);
e420dfb4 YL	404	if (!irq_iommu) {
4c5502b1	405	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
b6fcb33a SS	406	return -1;
	407	}
	408
c4658b4e	409	rc = clear_entries(irq_iommu);
b6fcb33a	410
e420dfb4 YL	411	irq_iommu->iommu = NULL;
	412	irq_iommu->irte_index = 0;
	413	irq_iommu->sub_handle = 0;
	414	irq_iommu->irte_mask = 0;
b6fcb33a	415
4c5502b1	416	spin_unlock_irqrestore(&irq_2_ir_lock, flags);
b6fcb33a	417
704126ad	418	return rc;
b6fcb33a SS	419	}
b6fcb33a SS	420
2ae21010 SS	421	static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode)
	422	{
	423	u64 addr;
c416daa9	424	u32 sts;
2ae21010 SS	425	unsigned long flags;
	426
	427	addr = virt_to_phys((void *)iommu->ir_table->base);
	428
	429	spin_lock_irqsave(&iommu->register_lock, flags);
	430
	431	dmar_writeq(iommu->reg + DMAR_IRTA_REG,
	432	(addr) \| IR_X2APIC_MODE(mode) \| INTR_REMAP_TABLE_REG_SIZE);
	433
	434	/* Set interrupt-remapping table pointer */
161fde08	435	iommu->gcmd \|= DMA_GCMD_SIRTP;
c416daa9	436	writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
2ae21010 SS	437
	438	IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
	439	readl, (sts & DMA_GSTS_IRTPS), sts);
	440	spin_unlock_irqrestore(&iommu->register_lock, flags);
	441
	442	/*
	443	* global invalidation of interrupt entry cache before enabling
	444	* interrupt-remapping.
	445	*/
	446	qi_global_iec(iommu);
	447
	448	spin_lock_irqsave(&iommu->register_lock, flags);
	449
	450	/* Enable interrupt-remapping */
2ae21010	451	iommu->gcmd \|= DMA_GCMD_IRE;
c416daa9	452	writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
2ae21010 SS	453
	454	IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
	455	readl, (sts & DMA_GSTS_IRES), sts);
	456
	457	spin_unlock_irqrestore(&iommu->register_lock, flags);
	458	}
	459
	460
	461	static int setup_intr_remapping(struct intel_iommu *iommu, int mode)
	462	{
	463	struct ir_table *ir_table;
	464	struct page *pages;
	465
	466	ir_table = iommu->ir_table = kzalloc(sizeof(struct ir_table),
fa4b57cc	467	GFP_ATOMIC);
2ae21010 SS	468
	469	if (!iommu->ir_table)
	470	return -ENOMEM;
	471
fa4b57cc	472	pages = alloc_pages(GFP_ATOMIC \| __GFP_ZERO, INTR_REMAP_PAGE_ORDER);
2ae21010 SS	473
	474	if (!pages) {
	475	printk(KERN_ERR "failed to allocate pages of order %d\n",
	476	INTR_REMAP_PAGE_ORDER);
	477	kfree(iommu->ir_table);
	478	return -ENOMEM;
	479	}
	480
	481	ir_table->base = page_address(pages);
	482
	483	iommu_set_intr_remapping(iommu, mode);
	484	return 0;
	485	}
	486
eba67e5d SS	487	/*
	488	* Disable Interrupt Remapping.
	489	*/
b24696bc	490	static void iommu_disable_intr_remapping(struct intel_iommu *iommu)
eba67e5d SS	491	{
	492	unsigned long flags;
	493	u32 sts;
	494
	495	if (!ecap_ir_support(iommu->ecap))
	496	return;
	497
b24696bc FY	498	/*
	499	* global invalidation of interrupt entry cache before disabling
	500	* interrupt-remapping.
	501	*/
	502	qi_global_iec(iommu);
	503
eba67e5d SS	504	spin_lock_irqsave(&iommu->register_lock, flags);
	505
	506	sts = dmar_readq(iommu->reg + DMAR_GSTS_REG);
	507	if (!(sts & DMA_GSTS_IRES))
	508	goto end;
	509
	510	iommu->gcmd &= ~DMA_GCMD_IRE;
	511	writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
	512
	513	IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
	514	readl, !(sts & DMA_GSTS_IRES), sts);
	515
	516	end:
	517	spin_unlock_irqrestore(&iommu->register_lock, flags);
	518	}
	519
93758238 WH	520	int __init intr_remapping_supported(void)
	521	{
	522	struct dmar_drhd_unit *drhd;
	523
03ea8155 WH	524	if (disable_intremap)
	525	return 0;
	526
93758238 WH	527	for_each_drhd_unit(drhd) {
	528	struct intel_iommu *iommu = drhd->iommu;
	529
	530	if (!ecap_ir_support(iommu->ecap))
	531	return 0;
	532	}
	533
	534	return 1;
	535	}
	536
2ae21010 SS	537	int __init enable_intr_remapping(int eim)
	538	{
	539	struct dmar_drhd_unit *drhd;
	540	int setup = 0;
	541
1531a6a6 SS	542	for_each_drhd_unit(drhd) {
	543	struct intel_iommu *iommu = drhd->iommu;
	544
34aaaa94 HW	545	/*
	546	* If the queued invalidation is already initialized,
	547	* shouldn't disable it.
	548	*/
	549	if (iommu->qi)
	550	continue;
	551
1531a6a6 SS	552	/*
	553	* Clear previous faults.
	554	*/
	555	dmar_fault(-1, iommu);
	556
	557	/*
	558	* Disable intr remapping and queued invalidation, if already
	559	* enabled prior to OS handover.
	560	*/
b24696bc	561	iommu_disable_intr_remapping(iommu);
1531a6a6 SS	562
	563	dmar_disable_qi(iommu);
	564	}
	565
2ae21010 SS	566	/*
	567	* check for the Interrupt-remapping support
	568	*/
	569	for_each_drhd_unit(drhd) {
	570	struct intel_iommu *iommu = drhd->iommu;
	571
	572	if (!ecap_ir_support(iommu->ecap))
	573	continue;
	574
	575	if (eim && !ecap_eim_support(iommu->ecap)) {
	576	printk(KERN_INFO "DRHD %Lx: EIM not supported by DRHD, "
	577	" ecap %Lx\n", drhd->reg_base_addr, iommu->ecap);
	578	return -1;
	579	}
	580	}
	581
	582	/*
	583	* Enable queued invalidation for all the DRHD's.
	584	*/
	585	for_each_drhd_unit(drhd) {
	586	int ret;
	587	struct intel_iommu *iommu = drhd->iommu;
	588	ret = dmar_enable_qi(iommu);
	589
	590	if (ret) {
	591	printk(KERN_ERR "DRHD %Lx: failed to enable queued, "
	592	" invalidation, ecap %Lx, ret %d\n",
	593	drhd->reg_base_addr, iommu->ecap, ret);
	594	return -1;
	595	}
	596	}
	597
	598	/*
	599	* Setup Interrupt-remapping for all the DRHD's now.
	600	*/
	601	for_each_drhd_unit(drhd) {
	602	struct intel_iommu *iommu = drhd->iommu;
	603
	604	if (!ecap_ir_support(iommu->ecap))
	605	continue;
	606
	607	if (setup_intr_remapping(iommu, eim))
	608	goto error;
	609
	610	setup = 1;
	611	}
	612
	613	if (!setup)
	614	goto error;
	615
	616	intr_remapping_enabled = 1;
	617
	618	return 0;
	619
	620	error:
	621	/*
	622	* handle error condition gracefully here!
	623	*/
	624	return -1;
	625	}
ad3ad3f6 SS	626
	627	static int ir_parse_ioapic_scope(struct acpi_dmar_header *header,
	628	struct intel_iommu *iommu)
	629	{
	630	struct acpi_dmar_hardware_unit *drhd;
	631	struct acpi_dmar_device_scope *scope;
	632	void start, end;
	633
	634	drhd = (struct acpi_dmar_hardware_unit *)header;
	635
	636	start = (void *)(drhd + 1);
	637	end = ((void *)drhd) + header->length;
	638
	639	while (start < end) {
	640	scope = start;
	641	if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_IOAPIC) {
	642	if (ir_ioapic_num == MAX_IO_APICS) {
	643	printk(KERN_WARNING "Exceeded Max IO APICS\n");
	644	return -1;
	645	}
	646
	647	printk(KERN_INFO "IOAPIC id %d under DRHD base"
	648	" 0x%Lx\n", scope->enumeration_id,
	649	drhd->address);
	650
	651	ir_ioapic[ir_ioapic_num].iommu = iommu;
	652	ir_ioapic[ir_ioapic_num].id = scope->enumeration_id;
	653	ir_ioapic_num++;
	654	}
	655	start += scope->length;
	656	}
	657
	658	return 0;
	659	}
	660
	661	/*
	662	* Finds the assocaition between IOAPIC's and its Interrupt-remapping
	663	* hardware unit.
	664	*/
	665	int __init parse_ioapics_under_ir(void)
	666	{
	667	struct dmar_drhd_unit *drhd;
	668	int ir_supported = 0;
	669
	670	for_each_drhd_unit(drhd) {
	671	struct intel_iommu *iommu = drhd->iommu;
	672
	673	if (ecap_ir_support(iommu->ecap)) {
	674	if (ir_parse_ioapic_scope(drhd->hdr, iommu))
	675	return -1;
	676
	677	ir_supported = 1;
	678	}
	679	}
	680
	681	if (ir_supported && ir_ioapic_num != nr_ioapics) {
	682	printk(KERN_WARNING
	683	"Not all IO-APIC's listed under remapping hardware\n");
	684	return -1;
	685	}
	686
	687	return ir_supported;
	688	}
b24696bc FY	689
	690	void disable_intr_remapping(void)
	691	{
	692	struct dmar_drhd_unit *drhd;
	693	struct intel_iommu *iommu = NULL;
	694
	695	/*
	696	* Disable Interrupt-remapping for all the DRHD's now.
	697	*/
	698	for_each_iommu(iommu, drhd) {
	699	if (!ecap_ir_support(iommu->ecap))
	700	continue;
	701
	702	iommu_disable_intr_remapping(iommu);
	703	}
	704	}
	705
	706	int reenable_intr_remapping(int eim)
	707	{
	708	struct dmar_drhd_unit *drhd;
	709	int setup = 0;
	710	struct intel_iommu *iommu = NULL;
	711
	712	for_each_iommu(iommu, drhd)
	713	if (iommu->qi)
	714	dmar_reenable_qi(iommu);
	715
	716	/*
	717	* Setup Interrupt-remapping for all the DRHD's now.
	718	*/
	719	for_each_iommu(iommu, drhd) {
	720	if (!ecap_ir_support(iommu->ecap))
	721	continue;
	722
	723	/* Set up interrupt remapping for iommu.*/
	724	iommu_set_intr_remapping(iommu, eim);
	725	setup = 1;
	726	}
	727
	728	if (!setup)
	729	goto error;
	730
	731	return 0;
	732
	733	error:
	734	/*
	735	* handle error condition gracefully here!
	736	*/
	737	return -1;
	738	}
	739