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Diffstat (limited to 'arch/powerpc/mm/mmu_context_iommu.c')
-rw-r--r--arch/powerpc/mm/mmu_context_iommu.c110
1 files changed, 92 insertions, 18 deletions
diff --git a/arch/powerpc/mm/mmu_context_iommu.c b/arch/powerpc/mm/mmu_context_iommu.c
index 56c2234cc6ae..a712a650a8b6 100644
--- a/arch/powerpc/mm/mmu_context_iommu.c
+++ b/arch/powerpc/mm/mmu_context_iommu.c
@@ -36,6 +36,8 @@ struct mm_iommu_table_group_mem_t {
u64 ua; /* userspace address */
u64 entries; /* number of entries in hpas[] */
u64 *hpas; /* vmalloc'ed */
+#define MM_IOMMU_TABLE_INVALID_HPA ((uint64_t)-1)
+ u64 dev_hpa; /* Device memory base address */
};
static long mm_iommu_adjust_locked_vm(struct mm_struct *mm,
@@ -126,7 +128,8 @@ static int mm_iommu_move_page_from_cma(struct page *page)
return 0;
}
-long mm_iommu_get(struct mm_struct *mm, unsigned long ua, unsigned long entries,
+static long mm_iommu_do_alloc(struct mm_struct *mm, unsigned long ua,
+ unsigned long entries, unsigned long dev_hpa,
struct mm_iommu_table_group_mem_t **pmem)
{
struct mm_iommu_table_group_mem_t *mem;
@@ -140,12 +143,6 @@ long mm_iommu_get(struct mm_struct *mm, unsigned long ua, unsigned long entries,
list_for_each_entry_rcu(mem, &mm->context.iommu_group_mem_list,
next) {
- if ((mem->ua == ua) && (mem->entries == entries)) {
- ++mem->used;
- *pmem = mem;
- goto unlock_exit;
- }
-
/* Overlap? */
if ((mem->ua < (ua + (entries << PAGE_SHIFT))) &&
(ua < (mem->ua +
@@ -156,11 +153,13 @@ long mm_iommu_get(struct mm_struct *mm, unsigned long ua, unsigned long entries,
}
- ret = mm_iommu_adjust_locked_vm(mm, entries, true);
- if (ret)
- goto unlock_exit;
+ if (dev_hpa == MM_IOMMU_TABLE_INVALID_HPA) {
+ ret = mm_iommu_adjust_locked_vm(mm, entries, true);
+ if (ret)
+ goto unlock_exit;
- locked_entries = entries;
+ locked_entries = entries;
+ }
mem = kzalloc(sizeof(*mem), GFP_KERNEL);
if (!mem) {
@@ -168,6 +167,13 @@ long mm_iommu_get(struct mm_struct *mm, unsigned long ua, unsigned long entries,
goto unlock_exit;
}
+ if (dev_hpa != MM_IOMMU_TABLE_INVALID_HPA) {
+ mem->pageshift = __ffs(dev_hpa | (entries << PAGE_SHIFT));
+ mem->dev_hpa = dev_hpa;
+ goto good_exit;
+ }
+ mem->dev_hpa = MM_IOMMU_TABLE_INVALID_HPA;
+
/*
* For a starting point for a maximum page size calculation
* we use @ua and @entries natural alignment to allow IOMMU pages
@@ -236,6 +242,7 @@ populate:
mem->hpas[i] = page_to_pfn(page) << PAGE_SHIFT;
}
+good_exit:
atomic64_set(&mem->mapped, 1);
mem->used = 1;
mem->ua = ua;
@@ -252,13 +259,31 @@ unlock_exit:
return ret;
}
-EXPORT_SYMBOL_GPL(mm_iommu_get);
+
+long mm_iommu_new(struct mm_struct *mm, unsigned long ua, unsigned long entries,
+ struct mm_iommu_table_group_mem_t **pmem)
+{
+ return mm_iommu_do_alloc(mm, ua, entries, MM_IOMMU_TABLE_INVALID_HPA,
+ pmem);
+}
+EXPORT_SYMBOL_GPL(mm_iommu_new);
+
+long mm_iommu_newdev(struct mm_struct *mm, unsigned long ua,
+ unsigned long entries, unsigned long dev_hpa,
+ struct mm_iommu_table_group_mem_t **pmem)
+{
+ return mm_iommu_do_alloc(mm, ua, entries, dev_hpa, pmem);
+}
+EXPORT_SYMBOL_GPL(mm_iommu_newdev);
static void mm_iommu_unpin(struct mm_iommu_table_group_mem_t *mem)
{
long i;
struct page *page = NULL;
+ if (!mem->hpas)
+ return;
+
for (i = 0; i < mem->entries; ++i) {
if (!mem->hpas[i])
continue;
@@ -300,6 +325,7 @@ static void mm_iommu_release(struct mm_iommu_table_group_mem_t *mem)
long mm_iommu_put(struct mm_struct *mm, struct mm_iommu_table_group_mem_t *mem)
{
long ret = 0;
+ unsigned long entries, dev_hpa;
mutex_lock(&mem_list_mutex);
@@ -321,9 +347,12 @@ long mm_iommu_put(struct mm_struct *mm, struct mm_iommu_table_group_mem_t *mem)
}
/* @mapped became 0 so now mappings are disabled, release the region */
+ entries = mem->entries;
+ dev_hpa = mem->dev_hpa;
mm_iommu_release(mem);
- mm_iommu_adjust_locked_vm(mm, mem->entries, false);
+ if (dev_hpa == MM_IOMMU_TABLE_INVALID_HPA)
+ mm_iommu_adjust_locked_vm(mm, entries, false);
unlock_exit:
mutex_unlock(&mem_list_mutex);
@@ -368,27 +397,32 @@ struct mm_iommu_table_group_mem_t *mm_iommu_lookup_rm(struct mm_struct *mm,
return ret;
}
-struct mm_iommu_table_group_mem_t *mm_iommu_find(struct mm_struct *mm,
+struct mm_iommu_table_group_mem_t *mm_iommu_get(struct mm_struct *mm,
unsigned long ua, unsigned long entries)
{
struct mm_iommu_table_group_mem_t *mem, *ret = NULL;
+ mutex_lock(&mem_list_mutex);
+
list_for_each_entry_rcu(mem, &mm->context.iommu_group_mem_list, next) {
if ((mem->ua == ua) && (mem->entries == entries)) {
ret = mem;
+ ++mem->used;
break;
}
}
+ mutex_unlock(&mem_list_mutex);
+
return ret;
}
-EXPORT_SYMBOL_GPL(mm_iommu_find);
+EXPORT_SYMBOL_GPL(mm_iommu_get);
long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem,
unsigned long ua, unsigned int pageshift, unsigned long *hpa)
{
const long entry = (ua - mem->ua) >> PAGE_SHIFT;
- u64 *va = &mem->hpas[entry];
+ u64 *va;
if (entry >= mem->entries)
return -EFAULT;
@@ -396,6 +430,12 @@ long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem,
if (pageshift > mem->pageshift)
return -EFAULT;
+ if (!mem->hpas) {
+ *hpa = mem->dev_hpa + (ua - mem->ua);
+ return 0;
+ }
+
+ va = &mem->hpas[entry];
*hpa = (*va & MM_IOMMU_TABLE_GROUP_PAGE_MASK) | (ua & ~PAGE_MASK);
return 0;
@@ -406,7 +446,6 @@ long mm_iommu_ua_to_hpa_rm(struct mm_iommu_table_group_mem_t *mem,
unsigned long ua, unsigned int pageshift, unsigned long *hpa)
{
const long entry = (ua - mem->ua) >> PAGE_SHIFT;
- void *va = &mem->hpas[entry];
unsigned long *pa;
if (entry >= mem->entries)
@@ -415,7 +454,12 @@ long mm_iommu_ua_to_hpa_rm(struct mm_iommu_table_group_mem_t *mem,
if (pageshift > mem->pageshift)
return -EFAULT;
- pa = (void *) vmalloc_to_phys(va);
+ if (!mem->hpas) {
+ *hpa = mem->dev_hpa + (ua - mem->ua);
+ return 0;
+ }
+
+ pa = (void *) vmalloc_to_phys(&mem->hpas[entry]);
if (!pa)
return -EFAULT;
@@ -435,6 +479,9 @@ extern void mm_iommu_ua_mark_dirty_rm(struct mm_struct *mm, unsigned long ua)
if (!mem)
return;
+ if (mem->dev_hpa != MM_IOMMU_TABLE_INVALID_HPA)
+ return;
+
entry = (ua - mem->ua) >> PAGE_SHIFT;
va = &mem->hpas[entry];
@@ -445,6 +492,33 @@ extern void mm_iommu_ua_mark_dirty_rm(struct mm_struct *mm, unsigned long ua)
*pa |= MM_IOMMU_TABLE_GROUP_PAGE_DIRTY;
}
+bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa,
+ unsigned int pageshift, unsigned long *size)
+{
+ struct mm_iommu_table_group_mem_t *mem;
+ unsigned long end;
+
+ list_for_each_entry_rcu(mem, &mm->context.iommu_group_mem_list, next) {
+ if (mem->dev_hpa == MM_IOMMU_TABLE_INVALID_HPA)
+ continue;
+
+ end = mem->dev_hpa + (mem->entries << PAGE_SHIFT);
+ if ((mem->dev_hpa <= hpa) && (hpa < end)) {
+ /*
+ * Since the IOMMU page size might be bigger than
+ * PAGE_SIZE, the amount of preregistered memory
+ * starting from @hpa might be smaller than 1<<pageshift
+ * and the caller needs to distinguish this situation.
+ */
+ *size = min(1UL << pageshift, end - hpa);
+ return true;
+ }
+ }
+
+ return false;
+}
+EXPORT_SYMBOL_GPL(mm_iommu_is_devmem);
+
long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem)
{
if (atomic64_inc_not_zero(&mem->mapped))
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 19:49:23 +0100