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Subject[PATCH v11 04/10] iommu/vt-d: functions to copy data from old mem
Date
Add some functions to copy the data from old kernel.
These functions are used to copy context tables and page tables.

To avoid calling iounmap between spin_lock_irqsave and spin_unlock_irqrestore,
use a link here, store the pointers , and then use iounmap to free them in
another place.

Li, Zhen-hua:
The functions and logics.

Takao Indoh:
Check if pfn is ram:
if (page_is_ram(pfn))

Signed-off-by: Li, Zhen-Hua <zhen-hual@hp.com>
Signed-off-by: Takao Indoh <indou.takao@jp.fujitsu.com>
---
drivers/iommu/intel-iommu.c | 102 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/intel-iommu.h | 6 +++
2 files changed, 108 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 07e6118..0b97c15 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -371,6 +371,17 @@ static struct context_entry *device_to_existing_context_entry(
struct intel_iommu *iommu,
u8 bus, u8 devfn);

+/*
+ * A structure used to store the address allocated by ioremap();
+ * The we need to call iounmap() to free them out of spin_lock_irqsave/unlock;
+ */
+struct iommu_remapped_entry {
+ struct list_head list;
+ void __iomem *mem;
+};
+static LIST_HEAD(__iommu_remapped_mem);
+static DEFINE_MUTEX(__iommu_mem_list_lock);
+

/*
* This domain is a statically identity mapping domain.
@@ -4833,3 +4844,94 @@ static struct context_entry *device_to_existing_context_entry(
return ret;
}

+/*
+ * Copy memory from a physically-addressed area into a virtually-addressed area
+ */
+int __iommu_load_from_oldmem(void *to, unsigned long from, unsigned long size)
+{
+ unsigned long pfn; /* Page Frame Number */
+ size_t csize = (size_t)size; /* Num(bytes to copy) */
+ unsigned long offset; /* Lower 12 bits of to */
+ void __iomem *virt_mem;
+ struct iommu_remapped_entry *mapped;
+
+ pfn = from >> VTD_PAGE_SHIFT;
+ offset = from & (~VTD_PAGE_MASK);
+
+ if (page_is_ram(pfn)) {
+ memcpy(to, pfn_to_kaddr(pfn) + offset, csize);
+ } else{
+
+ mapped = kzalloc(sizeof(struct iommu_remapped_entry),
+ GFP_KERNEL);
+ if (!mapped)
+ return -ENOMEM;
+
+ virt_mem = ioremap_cache((unsigned long)from, size);
+ if (!virt_mem) {
+ kfree(mapped);
+ return -ENOMEM;
+ }
+ memcpy(to, virt_mem, size);
+
+ mutex_lock(&__iommu_mem_list_lock);
+ mapped->mem = virt_mem;
+ list_add_tail(&mapped->list, &__iommu_remapped_mem);
+ mutex_unlock(&__iommu_mem_list_lock);
+ }
+ return size;
+}
+
+/*
+ * Copy memory from a virtually-addressed area into a physically-addressed area
+ */
+int __iommu_save_to_oldmem(unsigned long to, void *from, unsigned long size)
+{
+ unsigned long pfn; /* Page Frame Number */
+ size_t csize = (size_t)size; /* Num(bytes to copy) */
+ unsigned long offset; /* Lower 12 bits of to */
+ void __iomem *virt_mem;
+ struct iommu_remapped_entry *mapped;
+
+ pfn = to >> VTD_PAGE_SHIFT;
+ offset = to & (~VTD_PAGE_MASK);
+
+ if (page_is_ram(pfn)) {
+ memcpy(pfn_to_kaddr(pfn) + offset, from, csize);
+ } else{
+ mapped = kzalloc(sizeof(struct iommu_remapped_entry),
+ GFP_KERNEL);
+ if (!mapped)
+ return -ENOMEM;
+
+ virt_mem = ioremap_cache((unsigned long)to, size);
+ if (!virt_mem) {
+ kfree(mapped);
+ return -ENOMEM;
+ }
+ memcpy(virt_mem, from, size);
+ mutex_lock(&__iommu_mem_list_lock);
+ mapped->mem = virt_mem;
+ list_add_tail(&mapped->list, &__iommu_remapped_mem);
+ mutex_unlock(&__iommu_mem_list_lock);
+ }
+ return size;
+}
+
+/*
+ * Free the mapped memory for ioremap;
+ */
+int __iommu_free_mapped_mem(void)
+{
+ struct iommu_remapped_entry *mem_entry, *tmp;
+
+ mutex_lock(&__iommu_mem_list_lock);
+ list_for_each_entry_safe(mem_entry, tmp, &__iommu_remapped_mem, list) {
+ iounmap(mem_entry->mem);
+ list_del(&mem_entry->list);
+ kfree(mem_entry);
+ }
+ mutex_unlock(&__iommu_mem_list_lock);
+ return 0;
+}
+
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 796ef96..ced1fac 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -380,4 +380,10 @@ extern int dmar_ir_support(void);

extern const struct attribute_group *intel_iommu_groups[];

+extern int __iommu_load_from_oldmem(void *to, unsigned long from,
+ unsigned long size);
+extern int __iommu_save_to_oldmem(unsigned long to, void *from,
+ unsigned long size);
+extern int __iommu_free_mapped_mem(void);
+
#endif
--
2.0.0-rc0


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