It is called in static int copy_root_entry_table(struct intel_iommu *iommu); On 05/07/2015 03:49 PM, Baoquan He wrote:
On 04/10/15 at 04:42pm, Li, Zhen-Hua wrote: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@xxxxxx> Signed-off-by: Takao Indoh <indou.takao@xxxxxxxxxxxxxx> --- 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 ff5ac04..5ba403a 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -373,6 +373,17 @@ 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. @@ -4817,3 +4828,94 @@ static struct context_entry *device_to_existing_context_entry( return ret; } +/* + * Copy memory from a physically-addressed area into a virtually-addressed area + */I don't find where __iommu_load_from_oldmem is called. Obsolete code of this patch?+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 a65208a..4bca7b5 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -368,4 +368,10 @@ 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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