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Message-Id: <1431337974-545-10-git-send-email-zhen-hual@hp.com>
Date: Mon, 11 May 2015 17:52:53 +0800
From: "Li, Zhen-Hua" <zhen-hual@...com>
To: <dwmw2@...radead.org>, <indou.takao@...fujitsu.com>,
<bhe@...hat.com>, <joro@...tes.org>, <vgoyal@...hat.com>,
<dyoung@...hat.com>
Cc: <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
<linux-pci@...r.kernel.org>, <kexec@...ts.infradead.org>,
<alex.williamson@...hat.com>, <ddutile@...hat.com>,
<ishii.hironobu@...fujitsu.com>, <bhelgaas@...gle.com>,
<doug.hatch@...com>, <jerry.hoemann@...com>, <tom.vaden@...com>,
<li.zhang6@...com>, <lisa.mitchell@...com>,
<billsumnerlinux@...il.com>, <zhen-hual@...com>, <rwright@...com>
Subject: [PATCH v11 09/10] iommu/vt-d: Copy functions for irte
Functions to copy the irte data from the old kernel into the kdump kernel.
Signed-off-by: Li, Zhen-Hua <zhen-hual@...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 5709ae9..c2a4406 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;
@@ -1299,3 +1303,67 @@ 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 90e122e..d7a0b5d 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -301,6 +301,8 @@ struct q_inval {
struct ir_table {
struct irte *base;
unsigned long *bitmap;
+ void __iomem *base_old_virt;
+ unsigned long base_old_phys;
};
#endif
@@ -342,6 +344,8 @@ 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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