linux-kernel - [PATCH 08/17] x86: Use new cache mode type in mm/iomap

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Date:	Fri, 31 Oct 2014 15:00:24 +0100
From:	Juergen Gross <jgross@...e.com>
To:	hpa@...or.com, x86@...nel.org, tglx@...utronix.de,
	mingo@...hat.com, stefan.bader@...onical.com,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	konrad.wilk@...cle.com, ville.syrjala@...ux.intel.com,
	david.vrabel@...rix.com, jbeulich@...e.com, toshi.kani@...com,
	plagnioj@...osoft.com, tomi.valkeinen@...com, bhelgaas@...gle.com
Cc:	Juergen Gross <jgross@...e.com>
Subject: [PATCH 08/17] x86: Use new cache mode type in mm/iomap_32.c

Instead of directly using the cache mode bits in the pte switch to
using the cache mode type. This requires to change
io_reserve_memtype() as well.

Signed-off-by: Stefan Bader <stefan.bader@...onical.com>
Signed-off-by: Juergen Gross <jgross@...e.com>
---
 arch/x86/include/asm/pat.h |  2 +-
 arch/x86/mm/iomap_32.c     | 12 +++++++-----
 arch/x86/mm/pat.c          | 18 ++++++++++--------
 3 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/arch/x86/include/asm/pat.h b/arch/x86/include/asm/pat.h
index e2c1668..a8438bc 100644
--- a/arch/x86/include/asm/pat.h
+++ b/arch/x86/include/asm/pat.h
@@ -20,7 +20,7 @@ extern int kernel_map_sync_memtype(u64 base, unsigned long size,
 		unsigned long flag);
 
 int io_reserve_memtype(resource_size_t start, resource_size_t end,
-			unsigned long *type);
+			enum page_cache_mode *pcm);
 
 void io_free_memtype(resource_size_t start, resource_size_t end);
 
diff --git a/arch/x86/mm/iomap_32.c b/arch/x86/mm/iomap_32.c
index 7b179b49..9ca35fc 100644
--- a/arch/x86/mm/iomap_32.c
+++ b/arch/x86/mm/iomap_32.c
@@ -33,17 +33,17 @@ static int is_io_mapping_possible(resource_size_t base, unsigned long size)
 
 int iomap_create_wc(resource_size_t base, unsigned long size, pgprot_t *prot)
 {
-	unsigned long flag = _PAGE_CACHE_WC;
+	enum page_cache_mode pcm = _PAGE_CACHE_MODE_WC;
 	int ret;
 
 	if (!is_io_mapping_possible(base, size))
 		return -EINVAL;
 
-	ret = io_reserve_memtype(base, base + size, &flag);
+	ret = io_reserve_memtype(base, base + size, &pcm);
 	if (ret)
 		return ret;
 
-	*prot = __pgprot(__PAGE_KERNEL | flag);
+	*prot = __pgprot(__PAGE_KERNEL | cachemode2protval(pcm));
 	return 0;
 }
 EXPORT_SYMBOL_GPL(iomap_create_wc);
@@ -82,8 +82,10 @@ iomap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot)
 	 * MTRR is UC or WC.  UC_MINUS gets the real intention, of the
 	 * user, which is "WC if the MTRR is WC, UC if you can't do that."
 	 */
-	if (!pat_enabled && pgprot_val(prot) == pgprot_val(PAGE_KERNEL_WC))
-		prot = PAGE_KERNEL_UC_MINUS;
+	if (!pat_enabled && pgprot_val(prot) ==
+	    (__PAGE_KERNEL | cachemode2protval(_PAGE_CACHE_MODE_WC)))
+		prot = __pgprot(__PAGE_KERNEL |
+				cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS));
 
 	return (void __force __iomem *) kmap_atomic_prot_pfn(pfn, prot);
 }
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 47282c2..6d5a8e3 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -442,25 +442,27 @@ static unsigned long lookup_memtype(u64 paddr)
  * On failure, returns non-zero
  */
 int io_reserve_memtype(resource_size_t start, resource_size_t end,
-			unsigned long *type)
+			enum page_cache_mode *type)
 {
 	resource_size_t size = end - start;
-	unsigned long req_type = *type;
-	unsigned long new_type;
+	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, req_type, &new_type);
+	ret = reserve_memtype(start, end, cachemode2protval(req_type),
+				&new_prot);
 	if (ret)
 		goto out_err;
 
-	if (!is_new_memtype_allowed(start, size,
-				    pgprot2cachemode(__pgprot(req_type)),
-				    pgprot2cachemode(__pgprot(new_type))))
+	new_type = pgprot2cachemode(__pgprot(new_prot));
+
+	if (!is_new_memtype_allowed(start, size, req_type, new_type))
 		goto out_free;
 
-	if (kernel_map_sync_memtype(start, size, new_type) < 0)
+	if (kernel_map_sync_memtype(start, size, new_prot) < 0)
 		goto out_free;
 
 	*type = new_type;
-- 
1.8.4.5

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