[PATCH 09/10] iommu/vt-d: Copy functions for irte

[Li, Zhen-Hua]

Functions to copy the irte data from the old kernel into the kdump kernel.

Signed-off-by: Li, Zhen-Hua <zhen-h...@hp.com>
---
 drivers/iommu/intel_irq_remapping.c | 57 +++++++++++++++++++++++++++++++++++++
 include/linux/intel-iommu.h         |  4 +++
 2 files changed, 61 insertions(+)

diff --git a/drivers/iommu/intel_irq_remapping.c 
b/drivers/iommu/intel_irq_remapping.c
index a55b207..13f2034 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -8,6 +8,7 @@
 #include <linux/irq.h>
 #include <linux/intel-iommu.h>
 #include <linux/acpi.h>
+#include <linux/crash_dump.h>
 #include <asm/io_apic.h>
 #include <asm/smp.h>
 #include <asm/cpu.h>
@@ -17,6 +18,11 @@
 
 #include "irq_remapping.h"
 
+#ifdef CONFIG_CRASH_DUMP
+static int __iommu_load_old_irte(struct intel_iommu *iommu);
+static int __iommu_update_old_irte(struct intel_iommu *iommu, int index);
+#endif /* CONFIG_CRASH_DUMP */
+
 struct ioapic_scope {
        struct intel_iommu *iommu;
        unsigned int id;
@@ -1296,3 +1302,54 @@ int dmar_ir_hotplug(struct dmar_drhd_unit *dmaru, bool 
insert)
 
        return ret;
 }
+
+#ifdef CONFIG_CRASH_DUMP
+
+static int __iommu_load_old_irte(struct intel_iommu *iommu)
+{
+       if ((!iommu)
+               || (!iommu->ir_table)
+               || (!iommu->ir_table->base)
+               || (!iommu->ir_table->base_old_phys)
+               || (!iommu->ir_table->base_old_virt))
+               return -1;
+
+       memcpy(iommu->ir_table->base,
+               iommu->ir_table->base_old_virt,
+               INTR_REMAP_TABLE_ENTRIES*sizeof(struct irte));
+
+       return 0;
+}
+
+static int __iommu_update_old_irte(struct intel_iommu *iommu, int index)
+{
+       int start;
+       unsigned long size;
+       void __iomem *to;
+       void *from;
+
+       if ((!iommu)
+               || (!iommu->ir_table)
+               || (!iommu->ir_table->base)
+               || (!iommu->ir_table->base_old_phys)
+               || (!iommu->ir_table->base_old_virt))
+               return -1;
+
+       if (index < -1 || index >= INTR_REMAP_TABLE_ENTRIES)
+               return -1;
+
+       if (index == -1) {
+               start = 0;
+               size = INTR_REMAP_TABLE_ENTRIES * sizeof(struct irte);
+       } else {
+               start = index * sizeof(struct irte);
+               size = sizeof(struct irte);
+       }
+
+       to = iommu->ir_table->base_old_virt;
+       from = iommu->ir_table->base;
+       memcpy(to + start, from + start, size);
+
+       return 0;
+}
+#endif /* CONFIG_CRASH_DUMP */
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 8e29b97..76c6ea5 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -290,6 +290,10 @@ struct q_inval {
 struct ir_table {
        struct irte *base;
        unsigned long *bitmap;
+#ifdef CONFIG_CRASH_DUMP
+       void __iomem *base_old_virt;
+       unsigned long base_old_phys;
+#endif
 };
 #endif
 
-- 
2.0.0-rc0

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