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[Xen-devel] [PATCH 12/17] x86: Use new cache mode type in memtype related functions



Instead of directly using the cache mode bits in the pte switch to
using the cache mode type.

Signed-off-by: Stefan Bader <stefan.bader@xxxxxxxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 arch/x86/include/asm/cacheflush.h |  38 ++++++++------
 arch/x86/include/asm/pat.h        |   2 +-
 arch/x86/mm/ioremap.c             |   5 +-
 arch/x86/mm/pageattr.c            |   9 ++--
 arch/x86/mm/pat.c                 | 102 ++++++++++++++++++--------------------
 arch/x86/mm/pat_internal.h        |  22 ++++----
 arch/x86/mm/pat_rbtree.c          |   8 +--
 7 files changed, 96 insertions(+), 90 deletions(-)

diff --git a/arch/x86/include/asm/cacheflush.h 
b/arch/x86/include/asm/cacheflush.h
index 9863ee3..157644b 100644
--- a/arch/x86/include/asm/cacheflush.h
+++ b/arch/x86/include/asm/cacheflush.h
@@ -9,10 +9,10 @@
 /*
  * X86 PAT uses page flags WC and Uncached together to keep track of
  * memory type of pages that have backing page struct. X86 PAT supports 3
- * different memory types, _PAGE_CACHE_WB, _PAGE_CACHE_WC and
- * _PAGE_CACHE_UC_MINUS and fourth state where page's memory type has not
+ * different memory types, _PAGE_CACHE_MODE_WB, _PAGE_CACHE_MODE_WC and
+ * _PAGE_CACHE_MODE_UC_MINUS and fourth state where page's memory type has not
  * been changed from its default (value of -1 used to denote this).
- * Note we do not support _PAGE_CACHE_UC here.
+ * Note we do not support _PAGE_CACHE_MODE_UC here.
  */
 
 #define _PGMT_DEFAULT          0
@@ -22,36 +22,40 @@
 #define _PGMT_MASK             (1UL << PG_uncached | 1UL << PG_arch_1)
 #define _PGMT_CLEAR_MASK       (~_PGMT_MASK)
 
-static inline unsigned long get_page_memtype(struct page *pg)
+static inline enum page_cache_mode get_page_memtype(struct page *pg)
 {
        unsigned long pg_flags = pg->flags & _PGMT_MASK;
 
        if (pg_flags == _PGMT_DEFAULT)
                return -1;
        else if (pg_flags == _PGMT_WC)
-               return _PAGE_CACHE_WC;
+               return _PAGE_CACHE_MODE_WC;
        else if (pg_flags == _PGMT_UC_MINUS)
-               return _PAGE_CACHE_UC_MINUS;
+               return _PAGE_CACHE_MODE_UC_MINUS;
        else
-               return _PAGE_CACHE_WB;
+               return _PAGE_CACHE_MODE_WB;
 }
 
-static inline void set_page_memtype(struct page *pg, unsigned long memtype)
+static inline void set_page_memtype(struct page *pg,
+                                   enum page_cache_mode memtype)
 {
-       unsigned long memtype_flags = _PGMT_DEFAULT;
+       unsigned long memtype_flags;
        unsigned long old_flags;
        unsigned long new_flags;
 
        switch (memtype) {
-       case _PAGE_CACHE_WC:
+       case _PAGE_CACHE_MODE_WC:
                memtype_flags = _PGMT_WC;
                break;
-       case _PAGE_CACHE_UC_MINUS:
+       case _PAGE_CACHE_MODE_UC_MINUS:
                memtype_flags = _PGMT_UC_MINUS;
                break;
-       case _PAGE_CACHE_WB:
+       case _PAGE_CACHE_MODE_WB:
                memtype_flags = _PGMT_WB;
                break;
+       default:
+               memtype_flags = _PGMT_DEFAULT;
+               break;
        }
 
        do {
@@ -60,8 +64,14 @@ static inline void set_page_memtype(struct page *pg, 
unsigned long memtype)
        } while (cmpxchg(&pg->flags, old_flags, new_flags) != old_flags);
 }
 #else
-static inline unsigned long get_page_memtype(struct page *pg) { return -1; }
-static inline void set_page_memtype(struct page *pg, unsigned long memtype) { }
+static inline enum page_cache_mode get_page_memtype(struct page *pg)
+{
+       return -1;
+}
+static inline void set_page_memtype(struct page *pg,
+                                   enum page_cache_mode memtype)
+{
+}
 #endif
 
 /*
diff --git a/arch/x86/include/asm/pat.h b/arch/x86/include/asm/pat.h
index d35ee2d..150407a 100644
--- a/arch/x86/include/asm/pat.h
+++ b/arch/x86/include/asm/pat.h
@@ -13,7 +13,7 @@ static const int pat_enabled;
 extern void pat_init(void);
 
 extern int reserve_memtype(u64 start, u64 end,
-               unsigned long req_type, unsigned long *ret_type);
+               enum page_cache_mode req_pcm, enum page_cache_mode *ret_pcm);
 extern int free_memtype(u64 start, u64 end);
 
 extern int kernel_map_sync_memtype(u64 base, unsigned long size,
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index f31507f..8832e51 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -83,7 +83,6 @@ static void __iomem *__ioremap_caller(resource_size_t 
phys_addr,
        const unsigned long unaligned_size = size;
        struct vm_struct *area;
        enum page_cache_mode new_pcm;
-       unsigned long new_prot_val;
        pgprot_t prot;
        int retval;
        void __iomem *ret_addr;
@@ -135,14 +134,12 @@ static void __iomem *__ioremap_caller(resource_size_t 
phys_addr,
        size = PAGE_ALIGN(last_addr+1) - phys_addr;
 
        retval = reserve_memtype(phys_addr, (u64)phys_addr + size,
-                                cachemode2protval(pcm), &new_prot_val);
+                                               pcm, &new_pcm);
        if (retval) {
                printk(KERN_ERR "ioremap reserve_memtype failed %d\n", retval);
                return NULL;
        }
 
-       new_pcm = pgprot2cachemode(__pgprot(new_prot_val));
-
        if (pcm != new_pcm) {
                if (!is_new_memtype_allowed(phys_addr, size, pcm, new_pcm)) {
                        printk(KERN_ERR
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 73866f7..de807c9 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -1451,7 +1451,7 @@ int set_memory_uc(unsigned long addr, int numpages)
         * for now UC MINUS. see comments in ioremap_nocache()
         */
        ret = reserve_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE,
-                             _PAGE_CACHE_UC_MINUS, NULL);
+                             _PAGE_CACHE_MODE_UC_MINUS, NULL);
        if (ret)
                goto out_err;
 
@@ -1479,7 +1479,7 @@ static int _set_memory_array(unsigned long *addr, int 
addrinarray,
         */
        for (i = 0; i < addrinarray; i++) {
                ret = reserve_memtype(__pa(addr[i]), __pa(addr[i]) + PAGE_SIZE,
-                                       cachemode2protval(new_type), NULL);
+                                       new_type, NULL);
                if (ret)
                        goto out_free;
        }
@@ -1544,7 +1544,7 @@ int set_memory_wc(unsigned long addr, int numpages)
                return set_memory_uc(addr, numpages);
 
        ret = reserve_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE,
-               _PAGE_CACHE_WC, NULL);
+               _PAGE_CACHE_MODE_WC, NULL);
        if (ret)
                goto out_err;
 
@@ -1662,8 +1662,7 @@ static int _set_pages_array(struct page **pages, int 
addrinarray,
                        continue;
                start = page_to_pfn(pages[i]) << PAGE_SHIFT;
                end = start + PAGE_SIZE;
-               if (reserve_memtype(start, end, cachemode2protval(new_type),
-                                   NULL))
+               if (reserve_memtype(start, end, new_type, NULL))
                        goto err_out;
        }
 
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 8f68a83..ef75f3f 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -139,20 +139,21 @@ static DEFINE_SPINLOCK(memtype_lock);     /* protects 
memtype accesses */
  * The intersection is based on "Effective Memory Type" tables in IA-32
  * SDM vol 3a
  */
-static unsigned long pat_x_mtrr_type(u64 start, u64 end, unsigned long 
req_type)
+static unsigned long pat_x_mtrr_type(u64 start, u64 end,
+                                    enum page_cache_mode req_type)
 {
        /*
         * Look for MTRR hint to get the effective type in case where PAT
         * request is for WB.
         */
-       if (req_type == _PAGE_CACHE_WB) {
+       if (req_type == _PAGE_CACHE_MODE_WB) {
                u8 mtrr_type;
 
                mtrr_type = mtrr_type_lookup(start, end);
                if (mtrr_type != MTRR_TYPE_WRBACK)
-                       return _PAGE_CACHE_UC_MINUS;
+                       return _PAGE_CACHE_MODE_UC_MINUS;
 
-               return _PAGE_CACHE_WB;
+               return _PAGE_CACHE_MODE_WB;
        }
 
        return req_type;
@@ -207,25 +208,26 @@ static int pat_pagerange_is_ram(resource_size_t start, 
resource_size_t end)
  * - Find the memtype of all the pages in the range, look for any conflicts
  * - In case of no conflicts, set the new memtype for pages in the range
  */
-static int reserve_ram_pages_type(u64 start, u64 end, unsigned long req_type,
-                                 unsigned long *new_type)
+static int reserve_ram_pages_type(u64 start, u64 end,
+                                 enum page_cache_mode req_type,
+                                 enum page_cache_mode *new_type)
 {
        struct page *page;
        u64 pfn;
 
-       if (req_type == _PAGE_CACHE_UC) {
+       if (req_type == _PAGE_CACHE_MODE_UC) {
                /* We do not support strong UC */
                WARN_ON_ONCE(1);
-               req_type = _PAGE_CACHE_UC_MINUS;
+               req_type = _PAGE_CACHE_MODE_UC_MINUS;
        }
 
        for (pfn = (start >> PAGE_SHIFT); pfn < (end >> PAGE_SHIFT); ++pfn) {
-               unsigned long type;
+               enum page_cache_mode type;
 
                page = pfn_to_page(pfn);
                type = get_page_memtype(page);
                if (type != -1) {
-                       printk(KERN_INFO "reserve_ram_pages_type failed [mem 
%#010Lx-%#010Lx], track 0x%lx, req 0x%lx\n",
+                       pr_info("reserve_ram_pages_type failed [mem 
%#010Lx-%#010Lx], track 0x%x, req 0x%x\n",
                                start, end - 1, type, req_type);
                        if (new_type)
                                *new_type = type;
@@ -258,21 +260,21 @@ static int free_ram_pages_type(u64 start, u64 end)
 
 /*
  * req_type typically has one of the:
- * - _PAGE_CACHE_WB
- * - _PAGE_CACHE_WC
- * - _PAGE_CACHE_UC_MINUS
- * - _PAGE_CACHE_UC
+ * - _PAGE_CACHE_MODE_WB
+ * - _PAGE_CACHE_MODE_WC
+ * - _PAGE_CACHE_MODE_UC_MINUS
+ * - _PAGE_CACHE_MODE_UC
  *
  * If new_type is NULL, function will return an error if it cannot reserve the
  * region with req_type. If new_type is non-NULL, function will return
  * available type in new_type in case of no error. In case of any error
  * it will return a negative return value.
  */
-int reserve_memtype(u64 start, u64 end, unsigned long req_type,
-                   unsigned long *new_type)
+int reserve_memtype(u64 start, u64 end, enum page_cache_mode req_type,
+                   enum page_cache_mode *new_type)
 {
        struct memtype *new;
-       unsigned long actual_type;
+       enum page_cache_mode actual_type;
        int is_range_ram;
        int err = 0;
 
@@ -281,10 +283,10 @@ int reserve_memtype(u64 start, u64 end, unsigned long 
req_type,
        if (!pat_enabled) {
                /* This is identical to page table setting without PAT */
                if (new_type) {
-                       if (req_type == _PAGE_CACHE_WC)
-                               *new_type = _PAGE_CACHE_UC_MINUS;
+                       if (req_type == _PAGE_CACHE_MODE_WC)
+                               *new_type = _PAGE_CACHE_MODE_UC_MINUS;
                        else
-                               *new_type = req_type & _PAGE_CACHE_MASK;
+                               *new_type = req_type;
                }
                return 0;
        }
@@ -292,7 +294,7 @@ int reserve_memtype(u64 start, u64 end, unsigned long 
req_type,
        /* Low ISA region is always mapped WB in page table. No need to track */
        if (x86_platform.is_untracked_pat_range(start, end)) {
                if (new_type)
-                       *new_type = _PAGE_CACHE_WB;
+                       *new_type = _PAGE_CACHE_MODE_WB;
                return 0;
        }
 
@@ -302,7 +304,7 @@ int reserve_memtype(u64 start, u64 end, unsigned long 
req_type,
         * tools and ACPI tools). Use WB request for WB memory and use
         * UC_MINUS otherwise.
         */
-       actual_type = pat_x_mtrr_type(start, end, req_type & _PAGE_CACHE_MASK);
+       actual_type = pat_x_mtrr_type(start, end, req_type);
 
        if (new_type)
                *new_type = actual_type;
@@ -408,7 +410,7 @@ static enum page_cache_mode lookup_memtype(u64 paddr)
        if (pat_pagerange_is_ram(paddr, paddr + PAGE_SIZE)) {
                struct page *page;
                page = pfn_to_page(paddr >> PAGE_SHIFT);
-               rettype = pgprot2cachemode(__pgprot(get_page_memtype(page)));
+               rettype = get_page_memtype(page);
                /*
                 * -1 from get_page_memtype() implies RAM page is in its
                 * default state and not reserved, and hence of type WB
@@ -423,7 +425,7 @@ static enum page_cache_mode lookup_memtype(u64 paddr)
 
        entry = rbt_memtype_lookup(paddr);
        if (entry != NULL)
-               rettype = pgprot2cachemode(__pgprot(entry->type));
+               rettype = entry->type;
        else
                rettype = _PAGE_CACHE_MODE_UC_MINUS;
 
@@ -447,18 +449,14 @@ int io_reserve_memtype(resource_size_t start, 
resource_size_t end,
        resource_size_t size = end - start;
        enum page_cache_mode req_type = *type;
        enum page_cache_mode new_type;
-       unsigned long new_prot;
        int ret;
 
        WARN_ON_ONCE(iomem_map_sanity_check(start, size));
 
-       ret = reserve_memtype(start, end, cachemode2protval(req_type),
-                               &new_prot);
+       ret = reserve_memtype(start, end, req_type, &new_type);
        if (ret)
                goto out_err;
 
-       new_type = pgprot2cachemode(__pgprot(new_prot));
-
        if (!is_new_memtype_allowed(start, size, req_type, new_type))
                goto out_free;
 
@@ -524,13 +522,13 @@ static inline int range_is_allowed(unsigned long pfn, 
unsigned long size)
 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
                                unsigned long size, pgprot_t *vma_prot)
 {
-       unsigned long flags = _PAGE_CACHE_WB;
+       enum page_cache_mode pcm = _PAGE_CACHE_MODE_WB;
 
        if (!range_is_allowed(pfn, size))
                return 0;
 
        if (file->f_flags & O_DSYNC)
-               flags = _PAGE_CACHE_UC_MINUS;
+               pcm = _PAGE_CACHE_MODE_UC_MINUS;
 
 #ifdef CONFIG_X86_32
        /*
@@ -547,12 +545,12 @@ int phys_mem_access_prot_allowed(struct file *file, 
unsigned long pfn,
              boot_cpu_has(X86_FEATURE_CYRIX_ARR) ||
              boot_cpu_has(X86_FEATURE_CENTAUR_MCR)) &&
            (pfn << PAGE_SHIFT) >= __pa(high_memory)) {
-               flags = _PAGE_CACHE_UC;
+               pcm = _PAGE_CACHE_MODE_UC;
        }
 #endif
 
        *vma_prot = __pgprot((pgprot_val(*vma_prot) & ~_PAGE_CACHE_MASK) |
-                            flags);
+                            cachemode2protval(pcm));
        return 1;
 }
 
@@ -583,7 +581,7 @@ int kernel_map_sync_memtype(u64 base, unsigned long size,
                printk(KERN_INFO "%s:%d ioremap_change_attr failed %s "
                        "for [mem %#010Lx-%#010Lx]\n",
                        current->comm, current->pid,
-                       cattr_name(cachemode2protval(pcm)),
+                       cattr_name(pcm),
                        base, (unsigned long long)(base + size-1));
                return -EINVAL;
        }
@@ -600,8 +598,8 @@ static int reserve_pfn_range(u64 paddr, unsigned long size, 
pgprot_t *vma_prot,
 {
        int is_ram = 0;
        int ret;
-       unsigned long want_flags = (pgprot_val(*vma_prot) & _PAGE_CACHE_MASK);
-       unsigned long flags = want_flags;
+       enum page_cache_mode want_pcm = pgprot2cachemode(*vma_prot);
+       enum page_cache_mode pcm = want_pcm;
 
        is_ram = pat_pagerange_is_ram(paddr, paddr + size);
 
@@ -614,38 +612,36 @@ static int reserve_pfn_range(u64 paddr, unsigned long 
size, pgprot_t *vma_prot,
                if (!pat_enabled)
                        return 0;
 
-               flags = cachemode2protval(lookup_memtype(paddr));
-               if (want_flags != flags) {
+               pcm = lookup_memtype(paddr);
+               if (want_pcm != pcm) {
                        printk(KERN_WARNING "%s:%d map pfn RAM range req %s for 
[mem %#010Lx-%#010Lx], got %s\n",
                                current->comm, current->pid,
-                               cattr_name(want_flags),
+                               cattr_name(want_pcm),
                                (unsigned long long)paddr,
                                (unsigned long long)(paddr + size - 1),
-                               cattr_name(flags));
+                               cattr_name(pcm));
                        *vma_prot = __pgprot((pgprot_val(*vma_prot) &
-                                             (~_PAGE_CACHE_MASK)) |
-                                            flags);
+                                            (~_PAGE_CACHE_MASK)) |
+                                            cachemode2protval(pcm));
                }
                return 0;
        }
 
-       ret = reserve_memtype(paddr, paddr + size, want_flags, &flags);
+       ret = reserve_memtype(paddr, paddr + size, want_pcm, &pcm);
        if (ret)
                return ret;
 
-       if (flags != want_flags) {
+       if (pcm != want_pcm) {
                if (strict_prot ||
-                   !is_new_memtype_allowed(paddr, size,
-                               pgprot2cachemode(__pgprot(want_flags)),
-                               pgprot2cachemode(__pgprot(flags)))) {
+                   !is_new_memtype_allowed(paddr, size, want_pcm, pcm)) {
                        free_memtype(paddr, paddr + size);
                        printk(KERN_ERR "%s:%d map pfn expected mapping type %s"
                                " for [mem %#010Lx-%#010Lx], got %s\n",
                                current->comm, current->pid,
-                               cattr_name(want_flags),
+                               cattr_name(want_pcm),
                                (unsigned long long)paddr,
                                (unsigned long long)(paddr + size - 1),
-                               cattr_name(flags));
+                               cattr_name(pcm));
                        return -EINVAL;
                }
                /*
@@ -654,11 +650,10 @@ static int reserve_pfn_range(u64 paddr, unsigned long 
size, pgprot_t *vma_prot,
                 */
                *vma_prot = __pgprot((pgprot_val(*vma_prot) &
                                      (~_PAGE_CACHE_MASK)) |
-                                    flags);
+                                    cachemode2protval(pcm));
        }
 
-       if (kernel_map_sync_memtype(paddr, size,
-                                   pgprot2cachemode(__pgprot(flags))) < 0) {
+       if (kernel_map_sync_memtype(paddr, size, pcm) < 0) {
                free_memtype(paddr, paddr + size);
                return -EINVAL;
        }
@@ -799,7 +794,8 @@ void untrack_pfn(struct vm_area_struct *vma, unsigned long 
pfn,
 pgprot_t pgprot_writecombine(pgprot_t prot)
 {
        if (pat_enabled)
-               return __pgprot(pgprot_val(prot) | _PAGE_CACHE_WC);
+               return __pgprot(pgprot_val(prot) |
+                               cachemode2protval(_PAGE_CACHE_MODE_WC));
        else
                return pgprot_noncached(prot);
 }
diff --git a/arch/x86/mm/pat_internal.h b/arch/x86/mm/pat_internal.h
index 77e5ba1..f641162 100644
--- a/arch/x86/mm/pat_internal.h
+++ b/arch/x86/mm/pat_internal.h
@@ -10,30 +10,32 @@ struct memtype {
        u64                     start;
        u64                     end;
        u64                     subtree_max_end;
-       unsigned long           type;
+       enum page_cache_mode    type;
        struct rb_node          rb;
 };
 
-static inline char *cattr_name(unsigned long flags)
+static inline char *cattr_name(enum page_cache_mode pcm)
 {
-       switch (flags & _PAGE_CACHE_MASK) {
-       case _PAGE_CACHE_UC:            return "uncached";
-       case _PAGE_CACHE_UC_MINUS:      return "uncached-minus";
-       case _PAGE_CACHE_WB:            return "write-back";
-       case _PAGE_CACHE_WC:            return "write-combining";
-       default:                        return "broken";
+       switch (pcm) {
+       case _PAGE_CACHE_MODE_UC:               return "uncached";
+       case _PAGE_CACHE_MODE_UC_MINUS:         return "uncached-minus";
+       case _PAGE_CACHE_MODE_WB:               return "write-back";
+       case _PAGE_CACHE_MODE_WC:               return "write-combining";
+       case _PAGE_CACHE_MODE_WT:               return "write-through";
+       case _PAGE_CACHE_MODE_WP:               return "write-protected";
+       default:                                return "broken";
        }
 }
 
 #ifdef CONFIG_X86_PAT
 extern int rbt_memtype_check_insert(struct memtype *new,
-                                       unsigned long *new_type);
+                                       enum page_cache_mode *new_type);
 extern struct memtype *rbt_memtype_erase(u64 start, u64 end);
 extern struct memtype *rbt_memtype_lookup(u64 addr);
 extern int rbt_memtype_copy_nth_element(struct memtype *out, loff_t pos);
 #else
 static inline int rbt_memtype_check_insert(struct memtype *new,
-                                       unsigned long *new_type)
+                                       enum page_cache_mode *new_type)
 { return 0; }
 static inline struct memtype *rbt_memtype_erase(u64 start, u64 end)
 { return NULL; }
diff --git a/arch/x86/mm/pat_rbtree.c b/arch/x86/mm/pat_rbtree.c
index 415f6c4..6582adc 100644
--- a/arch/x86/mm/pat_rbtree.c
+++ b/arch/x86/mm/pat_rbtree.c
@@ -122,11 +122,12 @@ static struct memtype *memtype_rb_exact_match(struct 
rb_root *root,
 
 static int memtype_rb_check_conflict(struct rb_root *root,
                                u64 start, u64 end,
-                               unsigned long reqtype, unsigned long *newtype)
+                               enum page_cache_mode reqtype,
+                               enum page_cache_mode *newtype)
 {
        struct rb_node *node;
        struct memtype *match;
-       int found_type = reqtype;
+       enum page_cache_mode found_type = reqtype;
 
        match = memtype_rb_lowest_match(&memtype_rbroot, start, end);
        if (match == NULL)
@@ -187,7 +188,8 @@ static void memtype_rb_insert(struct rb_root *root, struct 
memtype *newdata)
        rb_insert_augmented(&newdata->rb, root, &memtype_rb_augment_cb);
 }
 
-int rbt_memtype_check_insert(struct memtype *new, unsigned long *ret_type)
+int rbt_memtype_check_insert(struct memtype *new,
+                            enum page_cache_mode *ret_type)
 {
        int err = 0;
 
-- 
1.8.4.5


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