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From: Geert Uytterhoeven <geert+renesas@glider.be>
To: Rob Herring <robh+dt@kernel.org>,
	Russell King <linux@armlinux.org.uk>,
	Nicolas Pitre <nico@fluxnic.net>,
	Ard Biesheuvel <ardb@kernel.org>,
	Linus Walleij <linus.walleij@linaro.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Nick Kossifidis <mick@ics.forth.gr>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Frank Rowand <frowand.list@gmail.com>,
	Dave Young <dyoung@redhat.com>, Mike Rapoport <rppt@kernel.org>
Cc: Baoquan He <bhe@redhat.com>, Vivek Goyal <vgoyal@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-riscv@lists.infradead.org, kexec@lists.infradead.org,
	linux-mm@kvack.org, linux-renesas-soc@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Geert Uytterhoeven <geert+renesas@glider.be>
Subject: [PATCH v4 02/10] memblock: Add variables for usable memory limitation
Date: Wed, 14 Jul 2021 14:50:12 +0200	[thread overview]
Message-ID: <04c4d231fb03a3810d72a45c8a5bc2272c5975f3.1626266516.git.geert+renesas@glider.be> (raw)
In-Reply-To: <cover.1626266516.git.geert+renesas@glider.be>

Add two global variables (cap_mem_addr and cap_mem_size) for storing a
base address and size, describing a limited region in which memory may
be considered available for use by the kernel.  If enabled, memory
outside of this range is not available for use.

These variables can by filled by firmware-specific code, and used in
calls to memblock_cap_memory_range() by architecture-specific code.
An example user is the parser of the "linux,usable-memory-range"
property in the DT "/chosen" node.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
This is similar to how the initial ramdisk (phys_initrd_{start,size})
and ELF core headers (elfcorehdr_{addr,size})) are handled.

Does there exist a suitable place in the common memblock code to call
"memblock_cap_memory_range(cap_mem_addr, cap_mem_size)", or does this
have to be done in architecture-specific code?

v4:
  - New.
---
 include/linux/memblock.h | 6 ++++++
 mm/memblock.c            | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index cbf46f56d1053b68..07e2474c4c3901e9 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -25,6 +25,12 @@ extern unsigned long max_pfn;
  */
 extern unsigned long long max_possible_pfn;
 
+/*
+ * limited region in which memory may be considered usable by the kernel
+ */
+extern phys_addr_t cap_mem_addr;
+extern phys_addr_t cap_mem_size;
+
 /**
  * enum memblock_flags - definition of memory region attributes
  * @MEMBLOCK_NONE: no special request
diff --git a/mm/memblock.c b/mm/memblock.c
index 0041ff62c584e7e1..66659f2b10ed40ff 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -101,6 +101,8 @@ unsigned long max_low_pfn;
 unsigned long min_low_pfn;
 unsigned long max_pfn;
 unsigned long long max_possible_pfn;
+phys_addr_t cap_mem_addr;
+phys_addr_t cap_mem_size;
 
 static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
 static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_RESERVED_REGIONS] __initdata_memblock;
-- 
2.25.1


WARNING: multiple messages have this Message-ID
From: Geert Uytterhoeven <geert+renesas@glider.be>
To: Rob Herring <robh+dt@kernel.org>,
	Russell King <linux@armlinux.org.uk>,
	Nicolas Pitre <nico@fluxnic.net>,
	Ard Biesheuvel <ardb@kernel.org>,
	Linus Walleij <linus.walleij@linaro.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Nick Kossifidis <mick@ics.forth.gr>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Frank Rowand <frowand.list@gmail.com>,
	Dave Young <dyoung@redhat.com>, Mike Rapoport <rppt@kernel.org>
Cc: Baoquan He <bhe@redhat.com>, Vivek Goyal <vgoyal@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-riscv@lists.infradead.org, kexec@lists.infradead.org,
	linux-mm@kvack.org, linux-renesas-soc@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Geert Uytterhoeven <geert+renesas@glider.be>
Subject: [PATCH v4 02/10] memblock: Add variables for usable memory limitation
Date: Wed, 14 Jul 2021 14:50:12 +0200	[thread overview]
Message-ID: <04c4d231fb03a3810d72a45c8a5bc2272c5975f3.1626266516.git.geert+renesas@glider.be> (raw)
In-Reply-To: <cover.1626266516.git.geert+renesas@glider.be>

Add two global variables (cap_mem_addr and cap_mem_size) for storing a
base address and size, describing a limited region in which memory may
be considered available for use by the kernel.  If enabled, memory
outside of this range is not available for use.

These variables can by filled by firmware-specific code, and used in
calls to memblock_cap_memory_range() by architecture-specific code.
An example user is the parser of the "linux,usable-memory-range"
property in the DT "/chosen" node.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
This is similar to how the initial ramdisk (phys_initrd_{start,size})
and ELF core headers (elfcorehdr_{addr,size})) are handled.

Does there exist a suitable place in the common memblock code to call
"memblock_cap_memory_range(cap_mem_addr, cap_mem_size)", or does this
have to be done in architecture-specific code?

v4:
  - New.
---
 include/linux/memblock.h | 6 ++++++
 mm/memblock.c            | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index cbf46f56d1053b68..07e2474c4c3901e9 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -25,6 +25,12 @@ extern unsigned long max_pfn;
  */
 extern unsigned long long max_possible_pfn;
 
+/*
+ * limited region in which memory may be considered usable by the kernel
+ */
+extern phys_addr_t cap_mem_addr;
+extern phys_addr_t cap_mem_size;
+
 /**
  * enum memblock_flags - definition of memory region attributes
  * @MEMBLOCK_NONE: no special request
diff --git a/mm/memblock.c b/mm/memblock.c
index 0041ff62c584e7e1..66659f2b10ed40ff 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -101,6 +101,8 @@ unsigned long max_low_pfn;
 unsigned long min_low_pfn;
 unsigned long max_pfn;
 unsigned long long max_possible_pfn;
+phys_addr_t cap_mem_addr;
+phys_addr_t cap_mem_size;
 
 static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
 static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_RESERVED_REGIONS] __initdata_memblock;
-- 
2.25.1


_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

WARNING: multiple messages have this Message-ID
From: Geert Uytterhoeven <geert+renesas@glider.be>
To: Rob Herring <robh+dt@kernel.org>,
	Russell King <linux@armlinux.org.uk>,
	Nicolas Pitre <nico@fluxnic.net>,
	Ard Biesheuvel <ardb@kernel.org>,
	Linus Walleij <linus.walleij@linaro.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Nick Kossifidis <mick@ics.forth.gr>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Frank Rowand <frowand.list@gmail.com>,
	Dave Young <dyoung@redhat.com>, Mike Rapoport <rppt@kernel.org>
Cc: Baoquan He <bhe@redhat.com>, Vivek Goyal <vgoyal@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-riscv@lists.infradead.org, kexec@lists.infradead.org,
	linux-mm@kvack.org, linux-renesas-soc@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Geert Uytterhoeven <geert+renesas@glider.be>
Subject: [PATCH v4 02/10] memblock: Add variables for usable memory limitation
Date: Wed, 14 Jul 2021 14:50:12 +0200	[thread overview]
Message-ID: <04c4d231fb03a3810d72a45c8a5bc2272c5975f3.1626266516.git.geert+renesas@glider.be> (raw)
In-Reply-To: <cover.1626266516.git.geert+renesas@glider.be>

Add two global variables (cap_mem_addr and cap_mem_size) for storing a
base address and size, describing a limited region in which memory may
be considered available for use by the kernel.  If enabled, memory
outside of this range is not available for use.

These variables can by filled by firmware-specific code, and used in
calls to memblock_cap_memory_range() by architecture-specific code.
An example user is the parser of the "linux,usable-memory-range"
property in the DT "/chosen" node.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
This is similar to how the initial ramdisk (phys_initrd_{start,size})
and ELF core headers (elfcorehdr_{addr,size})) are handled.

Does there exist a suitable place in the common memblock code to call
"memblock_cap_memory_range(cap_mem_addr, cap_mem_size)", or does this
have to be done in architecture-specific code?

v4:
  - New.
---
 include/linux/memblock.h | 6 ++++++
 mm/memblock.c            | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index cbf46f56d1053b68..07e2474c4c3901e9 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -25,6 +25,12 @@ extern unsigned long max_pfn;
  */
 extern unsigned long long max_possible_pfn;
 
+/*
+ * limited region in which memory may be considered usable by the kernel
+ */
+extern phys_addr_t cap_mem_addr;
+extern phys_addr_t cap_mem_size;
+
 /**
  * enum memblock_flags - definition of memory region attributes
  * @MEMBLOCK_NONE: no special request
diff --git a/mm/memblock.c b/mm/memblock.c
index 0041ff62c584e7e1..66659f2b10ed40ff 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -101,6 +101,8 @@ unsigned long max_low_pfn;
 unsigned long min_low_pfn;
 unsigned long max_pfn;
 unsigned long long max_possible_pfn;
+phys_addr_t cap_mem_addr;
+phys_addr_t cap_mem_size;
 
 static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
 static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_RESERVED_REGIONS] __initdata_memblock;
-- 
2.25.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2021-07-14 12:51 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-14 12:50 [PATCH v4 00/10] Add generic support for kdump DT properties Geert Uytterhoeven
2021-07-14 12:50 ` Geert Uytterhoeven
2021-07-14 12:50 ` Geert Uytterhoeven
2021-07-14 12:50 ` [PATCH v4 01/10] crash_dump: Make elfcorehdr_{addr,size} always visible Geert Uytterhoeven
2021-07-14 12:50   ` [PATCH v4 01/10] crash_dump: Make elfcorehdr_{addr, size} " Geert Uytterhoeven
2021-07-14 12:50   ` Geert Uytterhoeven
2021-07-14 13:46   ` [PATCH v4 01/10] crash_dump: Make elfcorehdr_{addr,size} " Rob Herring
2021-07-14 13:46     ` Rob Herring
2021-07-14 13:46     ` Rob Herring
2021-07-14 12:50 ` Geert Uytterhoeven [this message]
2021-07-14 12:50   ` [PATCH v4 02/10] memblock: Add variables for usable memory limitation Geert Uytterhoeven
2021-07-14 12:50   ` Geert Uytterhoeven
2021-07-14 13:51   ` Rob Herring
2021-07-14 13:51     ` Rob Herring
2021-07-14 13:51     ` Rob Herring
2021-07-18  9:31     ` Mike Rapoport
2021-07-18  9:31       ` Mike Rapoport
2021-07-18  9:31       ` Mike Rapoport
2021-07-19  6:59       ` Geert Uytterhoeven
2021-07-19  6:59         ` Geert Uytterhoeven
2021-07-19  6:59         ` Geert Uytterhoeven
2021-07-19  6:59         ` Geert Uytterhoeven
2021-07-20  5:41         ` Mike Rapoport
2021-07-20  5:41           ` Mike Rapoport
2021-07-20  5:41           ` Mike Rapoport
2021-07-20  5:41           ` Mike Rapoport
2021-07-20  7:23           ` Geert Uytterhoeven
2021-07-20  7:23             ` Geert Uytterhoeven
2021-07-20  7:23             ` Geert Uytterhoeven
2021-07-20  7:23             ` Geert Uytterhoeven
2021-08-11  8:11     ` Geert Uytterhoeven
2021-08-11  8:11       ` Geert Uytterhoeven
2021-08-11  8:11       ` Geert Uytterhoeven
2021-08-11  8:11       ` Geert Uytterhoeven
2021-07-14 12:50 ` [PATCH v4 03/10] of: fdt: Add generic support for parsing elf core headers property Geert Uytterhoeven
2021-07-14 12:50   ` Geert Uytterhoeven
2021-07-14 12:50   ` Geert Uytterhoeven
2021-07-14 12:50 ` [PATCH v4 04/10] of: fdt: Add generic support for parsing usable memory range property Geert Uytterhoeven
2021-07-14 12:50   ` Geert Uytterhoeven
2021-07-14 12:50   ` Geert Uytterhoeven
2021-07-14 12:50 ` [PATCH v4 05/10] of: fdt: Use IS_ENABLED(CONFIG_BLK_DEV_INITRD) instead of #ifdef Geert Uytterhoeven
2021-07-14 12:50   ` Geert Uytterhoeven
2021-07-14 12:50   ` Geert Uytterhoeven
2021-07-14 12:50 ` [PATCH v4 06/10] riscv: Remove non-standard linux,elfcorehdr handling Geert Uytterhoeven
2021-07-14 12:50   ` [PATCH v4 06/10] riscv: Remove non-standard linux, elfcorehdr handling Geert Uytterhoeven
2021-07-14 12:50   ` Geert Uytterhoeven
2021-07-20 15:43   ` [PATCH v4 06/10] riscv: Remove non-standard linux,elfcorehdr handling Palmer Dabbelt
2021-07-20 15:43     ` [PATCH v4 06/10] riscv: Remove non-standard linux, elfcorehdr handling Palmer Dabbelt
2021-07-20 15:43     ` Palmer Dabbelt
2021-07-23 15:17     ` [PATCH v4 06/10] riscv: Remove non-standard linux,elfcorehdr handling Geert Uytterhoeven
2021-07-23 15:17       ` [PATCH v4 06/10] riscv: Remove non-standard linux, elfcorehdr handling Geert Uytterhoeven
2021-07-23 15:17       ` [PATCH v4 06/10] riscv: Remove non-standard linux,elfcorehdr handling Geert Uytterhoeven
2021-07-23 15:17       ` [PATCH v4 06/10] riscv: Remove non-standard linux, elfcorehdr handling Geert Uytterhoeven
2021-07-14 12:50 ` [PATCH v4 07/10] arm64: kdump: Remove custom linux,elfcorehdr parsing Geert Uytterhoeven
2021-07-14 12:50   ` [PATCH v4 07/10] arm64: kdump: Remove custom linux, elfcorehdr parsing Geert Uytterhoeven
2021-07-14 12:50   ` Geert Uytterhoeven
2021-07-14 12:50 ` [PATCH v4 08/10] arm64: kdump: Remove custom linux,usable-memory-range parsing Geert Uytterhoeven
2021-07-14 12:50   ` [PATCH v4 08/10] arm64: kdump: Remove custom linux, usable-memory-range parsing Geert Uytterhoeven
2021-07-14 12:50   ` Geert Uytterhoeven
2021-07-14 12:50 ` [PATCH v4 09/10] arm64: kdump: Use IS_ENABLED(CONFIG_CRASH_DUMP) instead of #ifdef Geert Uytterhoeven
2021-07-14 12:50   ` Geert Uytterhoeven
2021-07-14 12:50   ` Geert Uytterhoeven
2021-07-14 12:50 ` [PATCH v4 10/10] ARM: Parse kdump DT properties Geert Uytterhoeven
2021-07-14 12:50   ` Geert Uytterhoeven
2021-07-14 12:50   ` Geert Uytterhoeven
2021-07-14 14:53   ` Rob Herring
2021-07-14 14:53     ` Rob Herring
2021-07-14 14:53     ` Rob Herring

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