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Subject[PATCH v10 09/10] iommu/vt-d: Copy functions for irte
Date
Functions to copy the irte data from the old kernel into the kdump kernel.

Signed-off-by: Li, Zhen-Hua <zhen-hual@hp.com>
---
drivers/iommu/intel_irq_remapping.c | 68 +++++++++++++++++++++++++++++++++++++
include/linux/intel-iommu.h | 4 +++
2 files changed, 72 insertions(+)

diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index 14de1ab..e6426a0 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -17,6 +17,10 @@

#include "irq_remapping.h"

+static int __iommu_load_old_irte(struct intel_iommu *iommu);
+static int __iommu_update_old_irte(struct intel_iommu *iommu, int index);
+static void iommu_check_pre_ir_status(struct intel_iommu *iommu);
+
struct ioapic_scope {
struct intel_iommu *iommu;
unsigned int id;
@@ -1302,3 +1306,67 @@ int dmar_ir_hotplug(struct dmar_drhd_unit *dmaru, bool insert)

return ret;
}
+
+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));
+
+ __iommu_flush_cache(iommu, iommu->ir_table->base,
+ 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);
+
+ __iommu_flush_cache(iommu, to + start, size);
+
+ return 0;
+}
+
+static void iommu_check_pre_ir_status(struct intel_iommu *iommu)
+{
+ u32 sts;
+
+ sts = readl(iommu->reg + DMAR_GSTS_REG);
+ if (sts & DMA_GSTS_IRES) {
+ pr_info("IR is enabled prior to OS.\n");
+ iommu->pre_enabled_ir = 1;
+ }
+}
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 9ca025a..d7ee5ba 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -289,6 +289,8 @@ struct q_inval {
struct ir_table {
struct irte *base;
unsigned long *bitmap;
+ void __iomem *base_old_virt;
+ unsigned long base_old_phys;
};
#endif

@@ -330,6 +332,8 @@ struct intel_iommu {

/* whether translation is enabled prior to OS*/
u8 pre_enabled_trans;
+ /* whether interrupt remapping is enabled prior to OS*/
+ u8 pre_enabled_ir;

void __iomem *root_entry_old_virt; /* mapped from old root entry */
unsigned long root_entry_old_phys; /* root entry in old kernel */
--
2.0.0-rc0


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