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>

diff --git a/arch/x86/include/asm/cacheflush.h b/arch/x86/include/asm/cacheflush.h
index 634c40a..d92d63a 100644 (file)
--- a/arch/x86/include/asm/cacheflush.h
+++ b/arch/x86/include/asm/cacheflush.h
@@ -139,9 +139,11 @@ int set_memory_np(unsigned long addr, int numpages);
 int set_memory_4k(unsigned long addr, int numpages);
 
 int set_memory_array_uc(unsigned long *addr, int addrinarray);
+int set_memory_array_wc(unsigned long *addr, int addrinarray);
 int set_memory_array_wb(unsigned long *addr, int addrinarray);
 
 int set_pages_array_uc(struct page **pages, int addrinarray);
+int set_pages_array_wc(struct page **pages, int addrinarray);
 int set_pages_array_wb(struct page **pages, int addrinarray);
 
 /*

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index cf07c26..0c98a75 100644 (file)
--- 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);