Subject: [PATCH 2/2] ARM: OMAP4: Move the barrier memboclk_steal() as part of reserve callback

From: [email-masked] (Santosh Shilimkar)
Date: Tue, 14 Feb 2012 14:19:41 +0530

On Saturday 11 February 2012 12:49 AM, Tony Lindgren wrote:
> * Santosh Shilimkar <[email-masked]> [120202 05:33]:
>> arm_memblock_steal() is not suppose to be used outside ->reserve callback.
>> OMAP barrier errata code was using it outside reserve callback and hence
>> it was broken.
>>
>> Move the allocation as part of ->reserve callback to fix the it.
> 
> Please update this to mention again commit that changed things
> around for arm_memblock_steal() so it's clear why this is needed
> as a fix.

Sure. Patch with updated change log below.

Regards,
Santosh

>>From 4d1ea22985adfe458275b9ae3e00edc6e41a267f Mon Sep 17 00:00:00 2001
From: Santosh Shilimkar <[email-masked]>
Date: Thu, 2 Feb 2012 15:59:51 +0530
Subject: [PATCH 1/2] ARM: OMAP4: Move the barrier memboclk_steal() as
part of reserve callback

Commit 716a3dc{ARM: Add arm_memblock_steal() to allocate memory away
from the kernel} introduced arm_memblock_steal() which lead to
OMAP4_ERRATA_I688 to be broken and needed to be fixed.

arm_memblock_steal() is not suppose to be used outside ->reserve callback.
OMAP barrier errata code was using it outside reserve callback and hence
it was broken.

Move the allocation as part of ->reserve callback to fix the it.

Signed-off-by: Santosh Shilimkar <[email-masked]>
Cc: Tony Lindgren <[email-masked]>
---
 arch/arm/mach-omap2/Kconfig                   |    4 ++--
 arch/arm/mach-omap2/common.h                  |    1 +
 arch/arm/mach-omap2/io.c                      |    1 +
 arch/arm/mach-omap2/omap4-common.c            |   25
++++++++++++++++---------
 arch/arm/plat-omap/common.c                   |    1 +
 arch/arm/plat-omap/include/plat/omap-secure.h |    6 ++++++
 6 files changed, 27 insertions(+), 11 deletions(-)

diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
index d965da4..e20c8ab 100644
--- a/arch/arm/mach-omap2/Kconfig
+++ b/arch/arm/mach-omap2/Kconfig
@@ -364,8 +364,8 @@ config OMAP3_SDRC_AC_TIMING
 	  going on could result in system crashes;

 config OMAP4_ERRATA_I688
-	bool "OMAP4 errata: Async Bridge Corruption (BROKEN)"
-	depends on ARCH_OMAP4 && BROKEN
+	bool "OMAP4 errata: Async Bridge Corruption"
+	depends on ARCH_OMAP4
 	select ARCH_HAS_BARRIERS
 	help
 	  If a data is stalled inside asynchronous bridge because of back
diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h
index febffde..7e9338e 100644
--- a/arch/arm/mach-omap2/common.h
+++ b/arch/arm/mach-omap2/common.h
@@ -132,6 +132,7 @@ void omap3_map_io(void);
 void am33xx_map_io(void);
 void omap4_map_io(void);
 void ti81xx_map_io(void);
+void omap_barriers_init(void);

 /**
  * omap_test_timeout - busy-loop, testing a condition
diff --git a/arch/arm/mach-omap2/io.c b/arch/arm/mach-omap2/io.c
index eb50c29..fb11b44 100644
--- a/arch/arm/mach-omap2/io.c
+++ b/arch/arm/mach-omap2/io.c
@@ -307,6 +307,7 @@ void __init omapam33xx_map_common_io(void)
 void __init omap44xx_map_common_io(void)
 {
 	iotable_init(omap44xx_io_desc, ARRAY_SIZE(omap44xx_io_desc));
+	omap_barriers_init();
 }
 #endif

diff --git a/arch/arm/mach-omap2/omap4-common.c
b/arch/arm/mach-omap2/omap4-common.c
index 40a8fbc..ebc5950 100644
--- a/arch/arm/mach-omap2/omap4-common.c
+++ b/arch/arm/mach-omap2/omap4-common.c
@@ -24,6 +24,7 @@

 #include <plat/irqs.h>
 #include <plat/sram.h>
+#include <plat/omap-secure.h>

 #include <mach/hardware.h>
 #include <mach/omap-wakeupgen.h>
@@ -43,6 +44,9 @@ static void __iomem *sar_ram_base;

 void __iomem *dram_sync, *sram_sync;

+static phys_addr_t paddr;
+static u32 size;
+
 void omap_bus_sync(void)
 {
 	if (dram_sync && sram_sync) {
@@ -52,18 +56,20 @@ void omap_bus_sync(void)
 	}
 }

-static int __init omap_barriers_init(void)
+/* Steal one page physical memory for barrier implementation */
+int __init omap_barrier_reserve_memblock(void)
 {
-	struct map_desc dram_io_desc[1];
-	phys_addr_t paddr;
-	u32 size;
-
-	if (!cpu_is_omap44xx())
-		return -ENODEV;

 	size = ALIGN(PAGE_SIZE, SZ_1M);
 	paddr = arm_memblock_steal(size, SZ_1M);

+	return 0;
+}
+
+void __init omap_barriers_init(void)
+{
+	struct map_desc dram_io_desc[1];
+
 	dram_io_desc[0].virtual = OMAP4_DRAM_BARRIER_VA;
 	dram_io_desc[0].pfn = __phys_to_pfn(paddr);
 	dram_io_desc[0].length = size;
@@ -75,9 +81,10 @@ static int __init omap_barriers_init(void)
 	pr_info("OMAP4: Map 0x%08llx to 0x%08lx for dram barrier\n",
 		(long long) paddr, dram_io_desc[0].virtual);

-	return 0;
 }
-core_initcall(omap_barriers_init);
+#else
+void __init omap_barriers_init(void)
+{}
 #endif

 void __init gic_init_irq(void)
diff --git a/arch/arm/plat-omap/common.c b/arch/arm/plat-omap/common.c
index 06383b5..4de7d1e 100644
--- a/arch/arm/plat-omap/common.c
+++ b/arch/arm/plat-omap/common.c
@@ -69,6 +69,7 @@ void __init omap_reserve(void)
 	omap_vram_reserve_sdram_memblock();
 	omap_dsp_reserve_sdram_memblock();
 	omap_secure_ram_reserve_memblock();
+	omap_barrier_reserve_memblock();
 }

 void __init omap_init_consistent_dma_size(void)
diff --git a/arch/arm/plat-omap/include/plat/omap-secure.h
b/arch/arm/plat-omap/include/plat/omap-secure.h
index 64f9d1c..0f14fb7 100644
--- a/arch/arm/plat-omap/include/plat/omap-secure.h
+++ b/arch/arm/plat-omap/include/plat/omap-secure.h
@@ -10,4 +10,10 @@ static inline void omap_secure_ram_reserve_memblock(void)
 { }
 #endif

+#ifdef CONFIG_OMAP4_ERRATA_I688
+extern int omap_barrier_reserve_memblock(void);
+#else
+static inline void omap_barrier_reserve_memblock(void)
+{ }
+#endif
 #endif /* __OMAP_SECURE_H__ */
-- 
1.7.4.1

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