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Date:      Mon, 30 Nov 2015 17:09:25 +0000 (UTC)
From:      Michal Meloun <mmel@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r291492 - in head/sys/arm: arm include
Message-ID:  <201511301709.tAUH9P9E089512@repo.freebsd.org>

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Author: mmel
Date: Mon Nov 30 17:09:25 2015
New Revision: 291492
URL: https://svnweb.freebsd.org/changeset/base/291492

Log:
  ARM: create new memory attribute for writethrough cacheable memory.
  - add new TEX class for WT cacheable memory
  - export new TEX class to kernel as VM_MEMATTR_WT attribute
  - add new aliases VM_MEMATTR_WRITE_COMBINING and
    VM_MEMATTR_WRITE_BACK, it's used in DRM code
  
  Note:
   Only Cortex A8 supports WT caching in HW. On rest of Cortex CPUs,
   WT requests is treated as uncacheable.
  
  Approved by:	kib (mentor)

Modified:
  head/sys/arm/arm/pmap-v6-new.c
  head/sys/arm/include/pte-v6.h
  head/sys/arm/include/vm.h

Modified: head/sys/arm/arm/pmap-v6-new.c
==============================================================================
--- head/sys/arm/arm/pmap-v6-new.c	Mon Nov 30 16:34:13 2015	(r291491)
+++ head/sys/arm/arm/pmap-v6-new.c	Mon Nov 30 17:09:25 2015	(r291492)
@@ -388,14 +388,14 @@ pmap_debug(int level)
 
 static uint32_t tex_class[8] = {
 /*	    type      inner cache outer cache */
-	TEX(PRRR_MEM, NMRR_WB_WA, NMRR_WB_WA, 0),  /* 0 - ATTR_WB_WA */
-	TEX(PRRR_MEM, NMRR_NC,	  NMRR_NC,    0),  /* 1 - ATTR_NOCACHE */
-	TEX(PRRR_DEV, NMRR_NC,	  NMRR_NC,    0),  /* 2 - ATTR_DEVICE */
-	TEX(PRRR_SO,  NMRR_NC,	  NMRR_NC,    0),  /* 3 - ATTR_SO    */
-	TEX(PRRR_MEM, NMRR_NC,	  NMRR_NC,    0),  /* 4 - NOT USED YET */
-	TEX(PRRR_MEM, NMRR_NC,	  NMRR_NC,    0),  /* 5 - NOT USED YET */
-	TEX(PRRR_MEM, NMRR_NC,	  NMRR_NC,    0),  /* 6 - NOT USED YET */
-	TEX(PRRR_MEM, NMRR_NC,	  NMRR_NC,    0),  /* 7 - NOT USED YET */
+	TEX(PRRR_MEM, NMRR_WB_WA, NMRR_WB_WA, 0),  /* 0 - ATTR_WB_WA	*/
+	TEX(PRRR_MEM, NMRR_NC,	  NMRR_NC,    0),  /* 1 - ATTR_NOCACHE	*/
+	TEX(PRRR_DEV, NMRR_NC,	  NMRR_NC,    0),  /* 2 - ATTR_DEVICE	*/
+	TEX(PRRR_SO,  NMRR_NC,	  NMRR_NC,    0),  /* 3 - ATTR_SO	*/
+	TEX(PRRR_MEM, NMRR_WT,	  NMRR_WT,    0),  /* 4 - ATTR_WT	*/
+	TEX(PRRR_MEM, NMRR_NC,	  NMRR_NC,    0),  /* 5 - NOT USED YET	*/
+	TEX(PRRR_MEM, NMRR_NC,	  NMRR_NC,    0),  /* 6 - NOT USED YET	*/
+	TEX(PRRR_MEM, NMRR_NC,	  NMRR_NC,    0),  /* 7 - NOT USED YET	*/
 };
 #undef TEX
 

Modified: head/sys/arm/include/pte-v6.h
==============================================================================
--- head/sys/arm/include/pte-v6.h	Mon Nov 30 16:34:13 2015	(r291491)
+++ head/sys/arm/include/pte-v6.h	Mon Nov 30 17:09:25 2015	(r291492)
@@ -196,6 +196,7 @@
 #define	PTE2_ATTR_NOCACHE	TEX2_CLASS_1
 #define	PTE2_ATTR_DEVICE	TEX2_CLASS_2
 #define	PTE2_ATTR_SO		TEX2_CLASS_3
+#define	PTE2_ATTR_WT		TEX2_CLASS_4
 /*
  * Software defined bits for L1	descriptors
  *  - L1_AP0 is	used as	page accessed bit

Modified: head/sys/arm/include/vm.h
==============================================================================
--- head/sys/arm/include/vm.h	Mon Nov 30 16:34:13 2015	(r291491)
+++ head/sys/arm/include/vm.h	Mon Nov 30 17:09:25 2015	(r291492)
@@ -32,14 +32,16 @@
 #ifdef ARM_NEW_PMAP
 #include <machine/pte-v6.h>
 
-#define VM_MEMATTR_WB_WA	((vm_memattr_t)PTE2_ATTR_WB_WA)
-#define VM_MEMATTR_NOCACHE	((vm_memattr_t)PTE2_ATTR_NOCACHE)
-#define VM_MEMATTR_DEVICE	((vm_memattr_t)PTE2_ATTR_DEVICE)
-#define VM_MEMATTR_SO		((vm_memattr_t)PTE2_ATTR_SO)
-
-#define VM_MEMATTR_DEFAULT	VM_MEMATTR_WB_WA
-#define VM_MEMATTR_UNCACHEABLE	VM_MEMATTR_SO /*name is misused by DMA */
+#define VM_MEMATTR_WB_WA		((vm_memattr_t)PTE2_ATTR_WB_WA)
+#define VM_MEMATTR_NOCACHE		((vm_memattr_t)PTE2_ATTR_NOCACHE)
+#define VM_MEMATTR_DEVICE		((vm_memattr_t)PTE2_ATTR_DEVICE)
+#define VM_MEMATTR_SO			((vm_memattr_t)PTE2_ATTR_SO)
+#define VM_MEMATTR_WT			((vm_memattr_t)PTE2_ATTR_WT)
 
+#define VM_MEMATTR_DEFAULT		VM_MEMATTR_WB_WA
+#define VM_MEMATTR_UNCACHEABLE		VM_MEMATTR_SO 	/* misused by DMA */
+#define VM_MEMATTR_WRITE_COMBINING 	VM_MEMATTR_WT		/* for DRM */
+#define VM_MEMATTR_WRITE_BACK		VM_MEMATTR_WB_WA	/* for DRM */
 
 #else
 /* Memory attribute configuration. */



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