Re: [v3][PATCH 7/8] book3e/kexec/kdump: redefine VIRT_PHYS_OFFSET
On Tue, 2013-07-09 at 16:03 +0800, Tiejun Chen wrote: > Book3e is always aligned 1GB to create TLB so we should > use (KERNELBASE - MEMORY_START) as VIRT_PHYS_OFFSET to > get __pa/__va properly while boot kdump. What if MEMORY_START - PHYSICAL_START >= 1 GiB? What about the comment that says we can't use MEMORY_START before parsing the device tree? -Scott -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [v3][PATCH 7/8] book3e/kexec/kdump: redefine VIRT_PHYS_OFFSET
On Tue, 2013-07-09 at 16:03 +0800, Tiejun Chen wrote: Book3e is always aligned 1GB to create TLB so we should use (KERNELBASE - MEMORY_START) as VIRT_PHYS_OFFSET to get __pa/__va properly while boot kdump. What if MEMORY_START - PHYSICAL_START = 1 GiB? What about the comment that says we can't use MEMORY_START before parsing the device tree? -Scott -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [v3][PATCH 7/8] book3e/kexec/kdump: redefine VIRT_PHYS_OFFSET
On 07/10/2013 01:20 PM, Bhushan Bharat-R65777 wrote: -Original Message- From: Linuxppc-dev [mailto:linuxppc-dev- bounces+bharat.bhushan=freescale@lists.ozlabs.org] On Behalf Of Tiejun Chen Sent: Tuesday, July 09, 2013 1:33 PM To: b...@kernel.crashing.org Cc: linuxppc-...@lists.ozlabs.org; linux-kernel@vger.kernel.org Subject: [v3][PATCH 7/8] book3e/kexec/kdump: redefine VIRT_PHYS_OFFSET Book3e is always aligned 1GB to create TLB so we should use (KERNELBASE - MEMORY_START) as VIRT_PHYS_OFFSET to get __pa/__va properly while boot kdump. Signed-off-by: Tiejun Chen --- arch/powerpc/include/asm/page.h |2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h index 988c812..5b00081 100644 --- a/arch/powerpc/include/asm/page.h +++ b/arch/powerpc/include/asm/page.h @@ -112,6 +112,8 @@ extern long long virt_phys_offset; /* See Description below for VIRT_PHYS_OFFSET */ #ifdef CONFIG_RELOCATABLE_PPC32 #define VIRT_PHYS_OFFSET virt_phys_offset +#elif defined(CONFIG_PPC_BOOK3E_64) +#define VIRT_PHYS_OFFSET (KERNELBASE - MEMORY_START) Can you please explain this code a bit more. I am not understanding this part:) Nothing is special, we only need to redefine this to make sure __va()/__pa() can work well for BOOk3E-64 in BOOKE case: #ifdef CONFIG_BOOKE #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + VIRT_PHYS_OFFSET)) #define __pa(x) ((unsigned long)(x) - VIRT_PHYS_OFFSET) And the arch/powerpc/include/asm/page.h file has more descriptions inline :) Tiejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
RE: [v3][PATCH 7/8] book3e/kexec/kdump: redefine VIRT_PHYS_OFFSET
> -Original Message- > From: Linuxppc-dev [mailto:linuxppc-dev- > bounces+bharat.bhushan=freescale@lists.ozlabs.org] On Behalf Of Tiejun > Chen > Sent: Tuesday, July 09, 2013 1:33 PM > To: b...@kernel.crashing.org > Cc: linuxppc-...@lists.ozlabs.org; linux-kernel@vger.kernel.org > Subject: [v3][PATCH 7/8] book3e/kexec/kdump: redefine VIRT_PHYS_OFFSET > > Book3e is always aligned 1GB to create TLB so we should > use (KERNELBASE - MEMORY_START) as VIRT_PHYS_OFFSET to > get __pa/__va properly while boot kdump. > > Signed-off-by: Tiejun Chen > --- > arch/powerpc/include/asm/page.h |2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h > index 988c812..5b00081 100644 > --- a/arch/powerpc/include/asm/page.h > +++ b/arch/powerpc/include/asm/page.h > @@ -112,6 +112,8 @@ extern long long virt_phys_offset; > /* See Description below for VIRT_PHYS_OFFSET */ > #ifdef CONFIG_RELOCATABLE_PPC32 > #define VIRT_PHYS_OFFSET virt_phys_offset > +#elif defined(CONFIG_PPC_BOOK3E_64) > +#define VIRT_PHYS_OFFSET (KERNELBASE - MEMORY_START) Can you please explain this code a bit more. I am not understanding this part:) -Bharat > #else > #define VIRT_PHYS_OFFSET (KERNELBASE - PHYSICAL_START) > #endif > -- > 1.7.9.5 > > ___ > Linuxppc-dev mailing list > linuxppc-...@lists.ozlabs.org > https://lists.ozlabs.org/listinfo/linuxppc-dev -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[v3][PATCH 7/8] book3e/kexec/kdump: redefine VIRT_PHYS_OFFSET
Book3e is always aligned 1GB to create TLB so we should use (KERNELBASE - MEMORY_START) as VIRT_PHYS_OFFSET to get __pa/__va properly while boot kdump. Signed-off-by: Tiejun Chen --- arch/powerpc/include/asm/page.h |2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h index 988c812..5b00081 100644 --- a/arch/powerpc/include/asm/page.h +++ b/arch/powerpc/include/asm/page.h @@ -112,6 +112,8 @@ extern long long virt_phys_offset; /* See Description below for VIRT_PHYS_OFFSET */ #ifdef CONFIG_RELOCATABLE_PPC32 #define VIRT_PHYS_OFFSET virt_phys_offset +#elif defined(CONFIG_PPC_BOOK3E_64) +#define VIRT_PHYS_OFFSET (KERNELBASE - MEMORY_START) #else #define VIRT_PHYS_OFFSET (KERNELBASE - PHYSICAL_START) #endif -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
RE: [v3][PATCH 7/8] book3e/kexec/kdump: redefine VIRT_PHYS_OFFSET
-Original Message- From: Linuxppc-dev [mailto:linuxppc-dev- bounces+bharat.bhushan=freescale@lists.ozlabs.org] On Behalf Of Tiejun Chen Sent: Tuesday, July 09, 2013 1:33 PM To: b...@kernel.crashing.org Cc: linuxppc-...@lists.ozlabs.org; linux-kernel@vger.kernel.org Subject: [v3][PATCH 7/8] book3e/kexec/kdump: redefine VIRT_PHYS_OFFSET Book3e is always aligned 1GB to create TLB so we should use (KERNELBASE - MEMORY_START) as VIRT_PHYS_OFFSET to get __pa/__va properly while boot kdump. Signed-off-by: Tiejun Chen tiejun.c...@windriver.com --- arch/powerpc/include/asm/page.h |2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h index 988c812..5b00081 100644 --- a/arch/powerpc/include/asm/page.h +++ b/arch/powerpc/include/asm/page.h @@ -112,6 +112,8 @@ extern long long virt_phys_offset; /* See Description below for VIRT_PHYS_OFFSET */ #ifdef CONFIG_RELOCATABLE_PPC32 #define VIRT_PHYS_OFFSET virt_phys_offset +#elif defined(CONFIG_PPC_BOOK3E_64) +#define VIRT_PHYS_OFFSET (KERNELBASE - MEMORY_START) Can you please explain this code a bit more. I am not understanding this part:) -Bharat #else #define VIRT_PHYS_OFFSET (KERNELBASE - PHYSICAL_START) #endif -- 1.7.9.5 ___ Linuxppc-dev mailing list linuxppc-...@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [v3][PATCH 7/8] book3e/kexec/kdump: redefine VIRT_PHYS_OFFSET
On 07/10/2013 01:20 PM, Bhushan Bharat-R65777 wrote: -Original Message- From: Linuxppc-dev [mailto:linuxppc-dev- bounces+bharat.bhushan=freescale@lists.ozlabs.org] On Behalf Of Tiejun Chen Sent: Tuesday, July 09, 2013 1:33 PM To: b...@kernel.crashing.org Cc: linuxppc-...@lists.ozlabs.org; linux-kernel@vger.kernel.org Subject: [v3][PATCH 7/8] book3e/kexec/kdump: redefine VIRT_PHYS_OFFSET Book3e is always aligned 1GB to create TLB so we should use (KERNELBASE - MEMORY_START) as VIRT_PHYS_OFFSET to get __pa/__va properly while boot kdump. Signed-off-by: Tiejun Chen tiejun.c...@windriver.com --- arch/powerpc/include/asm/page.h |2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h index 988c812..5b00081 100644 --- a/arch/powerpc/include/asm/page.h +++ b/arch/powerpc/include/asm/page.h @@ -112,6 +112,8 @@ extern long long virt_phys_offset; /* See Description below for VIRT_PHYS_OFFSET */ #ifdef CONFIG_RELOCATABLE_PPC32 #define VIRT_PHYS_OFFSET virt_phys_offset +#elif defined(CONFIG_PPC_BOOK3E_64) +#define VIRT_PHYS_OFFSET (KERNELBASE - MEMORY_START) Can you please explain this code a bit more. I am not understanding this part:) Nothing is special, we only need to redefine this to make sure __va()/__pa() can work well for BOOk3E-64 in BOOKE case: #ifdef CONFIG_BOOKE #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + VIRT_PHYS_OFFSET)) #define __pa(x) ((unsigned long)(x) - VIRT_PHYS_OFFSET) And the arch/powerpc/include/asm/page.h file has more descriptions inline :) Tiejun -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[v3][PATCH 7/8] book3e/kexec/kdump: redefine VIRT_PHYS_OFFSET
Book3e is always aligned 1GB to create TLB so we should use (KERNELBASE - MEMORY_START) as VIRT_PHYS_OFFSET to get __pa/__va properly while boot kdump. Signed-off-by: Tiejun Chen tiejun.c...@windriver.com --- arch/powerpc/include/asm/page.h |2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h index 988c812..5b00081 100644 --- a/arch/powerpc/include/asm/page.h +++ b/arch/powerpc/include/asm/page.h @@ -112,6 +112,8 @@ extern long long virt_phys_offset; /* See Description below for VIRT_PHYS_OFFSET */ #ifdef CONFIG_RELOCATABLE_PPC32 #define VIRT_PHYS_OFFSET virt_phys_offset +#elif defined(CONFIG_PPC_BOOK3E_64) +#define VIRT_PHYS_OFFSET (KERNELBASE - MEMORY_START) #else #define VIRT_PHYS_OFFSET (KERNELBASE - PHYSICAL_START) #endif -- 1.7.9.5 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
