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authorYork Sun <york.sun@nxp.com>2016-06-24 16:46:21 -0700
committerYork Sun <york.sun@nxp.com>2016-07-15 09:01:43 -0700
commitf733d46620d0efb93091f147f81a4bf9588fad3f (patch)
tree2525a0db4c72834bd6f842082b2b4ebe7f0cc4b7 /arch/arm
parent252cdb46ee33ff876823d0ce0a0190c3878c76ff (diff)
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armv8: mmu: split block if necessary
When page tables are created, allow later table to be created on previous block entry. Splitting block feature is already working with current code. This patch only rearranges the code order and adds one condition to call split_block(). Signed-off-by: York Sun <york.sun@nxp.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/cpu/armv8/cache_v8.c70
1 files changed, 38 insertions, 32 deletions
diff --git a/arch/arm/cpu/armv8/cache_v8.c b/arch/arm/cpu/armv8/cache_v8.c
index b8867a7..8604035 100644
--- a/arch/arm/cpu/armv8/cache_v8.c
+++ b/arch/arm/cpu/armv8/cache_v8.c
@@ -167,6 +167,37 @@ static void set_pte_table(u64 *pte, u64 *table)
*pte = PTE_TYPE_TABLE | (ulong)table;
}
+/* Splits a block PTE into table with subpages spanning the old block */
+static void split_block(u64 *pte, int level)
+{
+ u64 old_pte = *pte;
+ u64 *new_table;
+ u64 i = 0;
+ /* level describes the parent level, we need the child ones */
+ int levelshift = level2shift(level + 1);
+
+ if (pte_type(pte) != PTE_TYPE_BLOCK)
+ panic("PTE %p (%llx) is not a block. Some driver code wants to "
+ "modify dcache settings for an range not covered in "
+ "mem_map.", pte, old_pte);
+
+ new_table = create_table();
+ debug("Splitting pte %p (%llx) into %p\n", pte, old_pte, new_table);
+
+ for (i = 0; i < MAX_PTE_ENTRIES; i++) {
+ new_table[i] = old_pte | (i << levelshift);
+
+ /* Level 3 block PTEs have the table type */
+ if ((level + 1) == 3)
+ new_table[i] |= PTE_TYPE_TABLE;
+
+ debug("Setting new_table[%lld] = %llx\n", i, new_table[i]);
+ }
+
+ /* Set the new table into effect */
+ set_pte_table(pte, new_table);
+}
+
/* Add one mm_region map entry to the page tables */
static void add_map(struct mm_region *map)
{
@@ -188,6 +219,8 @@ static void add_map(struct mm_region *map)
for (level = 1; level < 4; level++) {
pte = find_pte(addr, level);
+ if (!pte)
+ panic("pte not found\n");
blocksize = 1ULL << level2shift(level);
debug("Checking if pte fits for addr=%llx size=%llx "
"blocksize=%llx\n", addr, size, blocksize);
@@ -199,48 +232,21 @@ static void add_map(struct mm_region *map)
addr += blocksize;
size -= blocksize;
break;
- } else if ((pte_type(pte) == PTE_TYPE_FAULT)) {
+ } else if (pte_type(pte) == PTE_TYPE_FAULT) {
/* Page doesn't fit, create subpages */
debug("Creating subtable for addr 0x%llx "
"blksize=%llx\n", addr, blocksize);
new_table = create_table();
set_pte_table(pte, new_table);
+ } else if (pte_type(pte) == PTE_TYPE_BLOCK) {
+ debug("Split block into subtable for addr 0x%llx blksize=0x%llx\n",
+ addr, blocksize);
+ split_block(pte, level);
}
}
}
}
-/* Splits a block PTE into table with subpages spanning the old block */
-static void split_block(u64 *pte, int level)
-{
- u64 old_pte = *pte;
- u64 *new_table;
- u64 i = 0;
- /* level describes the parent level, we need the child ones */
- int levelshift = level2shift(level + 1);
-
- if (pte_type(pte) != PTE_TYPE_BLOCK)
- panic("PTE %p (%llx) is not a block. Some driver code wants to "
- "modify dcache settings for an range not covered in "
- "mem_map.", pte, old_pte);
-
- new_table = create_table();
- debug("Splitting pte %p (%llx) into %p\n", pte, old_pte, new_table);
-
- for (i = 0; i < MAX_PTE_ENTRIES; i++) {
- new_table[i] = old_pte | (i << levelshift);
-
- /* Level 3 block PTEs have the table type */
- if ((level + 1) == 3)
- new_table[i] |= PTE_TYPE_TABLE;
-
- debug("Setting new_table[%lld] = %llx\n", i, new_table[i]);
- }
-
- /* Set the new table into effect */
- set_pte_table(pte, new_table);
-}
-
enum pte_type {
PTE_INVAL,
PTE_BLOCK,