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iommu/vt-d: Copy IR table from old kernel when in kdump mode
When we are booting into a kdump kernel and find IR enabled, copy over the contents of the previous IR table so that spurious interrupts will not be target aborted. Tested-by: ZhenHua Li <zhen-hual@hp.com> Tested-by: Baoquan He <bhe@redhat.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -11,6 +11,7 @@
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#include <linux/irq.h>
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#include <linux/intel-iommu.h>
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#include <linux/acpi.h>
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#include <linux/crash_dump.h>
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#include <asm/io_apic.h>
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#include <asm/smp.h>
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#include <asm/cpu.h>
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@ -54,8 +55,28 @@ static struct hpet_scope ir_hpet[MAX_HPET_TBS];
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*/
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static DEFINE_RAW_SPINLOCK(irq_2_ir_lock);
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static void iommu_disable_irq_remapping(struct intel_iommu *iommu);
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static int __init parse_ioapics_under_ir(void);
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static bool ir_pre_enabled(struct intel_iommu *iommu)
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{
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return (iommu->flags & VTD_FLAG_IRQ_REMAP_PRE_ENABLED);
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}
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static void clear_ir_pre_enabled(struct intel_iommu *iommu)
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{
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iommu->flags &= ~VTD_FLAG_IRQ_REMAP_PRE_ENABLED;
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}
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static void init_ir_status(struct intel_iommu *iommu)
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{
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u32 gsts;
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gsts = readl(iommu->reg + DMAR_GSTS_REG);
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if (gsts & DMA_GSTS_IRES)
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iommu->flags |= VTD_FLAG_IRQ_REMAP_PRE_ENABLED;
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}
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static struct irq_2_iommu *irq_2_iommu(unsigned int irq)
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{
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struct irq_cfg *cfg = irq_cfg(irq);
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@ -426,6 +447,44 @@ static int set_msi_sid(struct irte *irte, struct pci_dev *dev)
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return 0;
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}
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static int iommu_load_old_irte(struct intel_iommu *iommu)
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{
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struct irte *old_ir_table;
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phys_addr_t irt_phys;
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size_t size;
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u64 irta;
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if (!is_kdump_kernel()) {
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pr_warn("IRQ remapping was enabled on %s but we are not in kdump mode\n",
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iommu->name);
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clear_ir_pre_enabled(iommu);
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iommu_disable_irq_remapping(iommu);
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return -EINVAL;
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}
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/* Check whether the old ir-table has the same size as ours */
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irta = dmar_readq(iommu->reg + DMAR_IRTA_REG);
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if ((irta & INTR_REMAP_TABLE_REG_SIZE_MASK)
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!= INTR_REMAP_TABLE_REG_SIZE)
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return -EINVAL;
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irt_phys = irta & VTD_PAGE_MASK;
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size = INTR_REMAP_TABLE_ENTRIES*sizeof(struct irte);
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/* Map the old IR table */
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old_ir_table = ioremap_cache(irt_phys, size);
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if (!old_ir_table)
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return -ENOMEM;
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/* Copy data over */
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memcpy(iommu->ir_table->base, old_ir_table, size);
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__iommu_flush_cache(iommu, iommu->ir_table->base, size);
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return 0;
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}
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static void iommu_set_irq_remapping(struct intel_iommu *iommu, int mode)
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{
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unsigned long flags;
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@ -531,6 +590,17 @@ static int intel_setup_irq_remapping(struct intel_iommu *iommu)
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}
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}
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init_ir_status(iommu);
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if (ir_pre_enabled(iommu)) {
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if (iommu_load_old_irte(iommu))
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pr_err("Failed to copy IR table for %s from previous kernel\n",
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iommu->name);
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else
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pr_info("Copied IR table for %s from previous kernel\n",
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iommu->name);
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}
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iommu_set_irq_remapping(iommu, eim_mode);
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return 0;
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@ -296,6 +296,7 @@ struct q_inval {
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/* 1MB - maximum possible interrupt remapping table size */
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#define INTR_REMAP_PAGE_ORDER 8
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#define INTR_REMAP_TABLE_REG_SIZE 0xf
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#define INTR_REMAP_TABLE_REG_SIZE_MASK 0xf
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#define INTR_REMAP_TABLE_ENTRIES 65536
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