123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207 |
- #include <linux/dmar.h>
- #include <linux/spinlock.h>
- #include <linux/jiffies.h>
- #include <linux/pci.h>
- #include <asm/io_apic.h>
- #include "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 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;
- }
|