arch/x86: Add array variants for setting memory to wc caching.

Setting single memory pages at a time to wc takes a lot time in cache flush. To
reduce number of cache flush set_pages_array_wc and set_memory_array_wc can be
used to set multiple pages to WC with single cache flush.

This improves allocation performance for wc cached pages in drm/ttm.

CC: Suresh Siddha <suresh.b.siddha@intel.com>
CC: Venkatesh Pallipadi <venkatesh.pallipadi@gmail.com>
Signed-off-by: Pauli Nieminen <suokkos@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 45 insertions, 8 deletions

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index cf07c26d9a4a..0c98a7583bfa 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -997,7 +997,8 @@ out_err:
 }
 EXPORT_SYMBOL(set_memory_uc);
 
-int set_memory_array_uc(unsigned long *addr, int addrinarray)
+int _set_memory_array(unsigned long *addr, int addrinarray,
+                unsigned long new_type)
 {
         int i, j;
         int ret;
@@ -1007,13 +1008,19 @@ int set_memory_array_uc(unsigned long *addr, int addrinarray)
          */
         for (i = 0; i < addrinarray; i++) {
                 ret = reserve_memtype(__pa(addr[i]), __pa(addr[i]) + PAGE_SIZE,
-                                        _PAGE_CACHE_UC_MINUS, NULL);
+                                        new_type, NULL);
                 if (ret)
                         goto out_free;
         }
 
         ret = change_page_attr_set(addr, addrinarray,
                                     __pgprot(_PAGE_CACHE_UC_MINUS), 1);
+
+        if (!ret && new_type == _PAGE_CACHE_WC)
+                ret = change_page_attr_set_clr(addr, addrinarray,
+                                               __pgprot(_PAGE_CACHE_WC),
+                                               __pgprot(_PAGE_CACHE_MASK),
+                                               0, CPA_ARRAY, NULL);
         if (ret)
                 goto out_free;
 
@@ -1025,8 +1032,19 @@ out_free:
 
         return ret;
 }
+
+int set_memory_array_uc(unsigned long *addr, int addrinarray)
+{
+        return _set_memory_array(addr, addrinarray, _PAGE_CACHE_UC_MINUS);
+}
 EXPORT_SYMBOL(set_memory_array_uc);
 
+int set_memory_array_wc(unsigned long *addr, int addrinarray)
+{
+        return _set_memory_array(addr, addrinarray, _PAGE_CACHE_WC);
+}
+EXPORT_SYMBOL(set_memory_array_wc);
+
 int _set_memory_wc(unsigned long addr, int numpages)
 {
         int ret;
@@ -1153,26 +1171,34 @@ int set_pages_uc(struct page *page, int numpages)
 }
 EXPORT_SYMBOL(set_pages_uc);
 
-int set_pages_array_uc(struct page **pages, int addrinarray)
+static int _set_pages_array(struct page **pages, int addrinarray,
+                unsigned long new_type)
 {
         unsigned long start;
         unsigned long end;
         int i;
         int free_idx;
+        int ret;
 
         for (i = 0; i < addrinarray; i++) {
                 if (PageHighMem(pages[i]))
                         continue;
                 start = page_to_pfn(pages[i]) << PAGE_SHIFT;
                 end = start + PAGE_SIZE;
-                if (reserve_memtype(start, end, _PAGE_CACHE_UC_MINUS, NULL))
+                if (reserve_memtype(start, end, new_type, NULL))
                         goto err_out;
         }
 
-        if (cpa_set_pages_array(pages, addrinarray,
-                        __pgprot(_PAGE_CACHE_UC_MINUS)) == 0) {
-                return 0; /* Success */
-        }
+        ret = cpa_set_pages_array(pages, addrinarray,
+                        __pgprot(_PAGE_CACHE_UC_MINUS));
+        if (!ret && new_type == _PAGE_CACHE_WC)
+                ret = change_page_attr_set_clr(NULL, addrinarray,
+                                               __pgprot(_PAGE_CACHE_WC),
+                                               __pgprot(_PAGE_CACHE_MASK),
+                                               0, CPA_PAGES_ARRAY, pages);
+        if (ret)
+                goto err_out;
+        return 0; /* Success */
 err_out:
         free_idx = i;
         for (i = 0; i < free_idx; i++) {
@@ -1184,8 +1210,19 @@ err_out:
         }
         return -EINVAL;
 }
+
+int set_pages_array_uc(struct page **pages, int addrinarray)
+{
+        return _set_pages_array(pages, addrinarray, _PAGE_CACHE_UC_MINUS);
+}
 EXPORT_SYMBOL(set_pages_array_uc);
 
+int set_pages_array_wc(struct page **pages, int addrinarray)
+{
+        return _set_pages_array(pages, addrinarray, _PAGE_CACHE_WC);
+}
+EXPORT_SYMBOL(set_pages_array_wc);
+
 int set_pages_wb(struct page *page, int numpages)
 {
         unsigned long addr = (unsigned long)page_address(page);