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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>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	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>
Cc: Baoquan He <bhe@redhat.com>, Vivek Goyal <vgoyal@redhat.com>,
	Mike Rapoport <rppt@kernel.org>,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-mips@vger.kernel.org, linux-riscv@lists.infradead.org,
	kexec@lists.infradead.org, linux-renesas-soc@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Geert Uytterhoeven <geert+renesas@glider.be>
Subject: [PATCH v5 4/9] of: fdt: Add generic support for handling usable memory range property
Date: Wed, 11 Aug 2021 10:51:02 +0200	[thread overview]
Message-ID: <3bd69bada93ee59b7d23c38b3527fc1654e19343.1628670468.git.geert+renesas@glider.be> (raw)
In-Reply-To: <cover.1628670468.git.geert+renesas@glider.be>

Add support for handling the "linux,usable-memory-range" property in the
"/chosen" node to the FDT core code.  This can co-exist safely with the
architecture-specific handling, until the latter has been removed.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
About the change to chosen.txt: I have a similar change for
schemas/chosen.yaml in dt-schema.

v5:
  - Handle the actual capping in generic code, too,

v4:
  - New.
---
 Documentation/devicetree/bindings/chosen.txt |  6 ++--
 drivers/of/fdt.c                             | 30 ++++++++++++++++++++
 2 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt
index 5b0b94eb2d04e79d..1cc3aa10dcb10588 100644
--- a/Documentation/devicetree/bindings/chosen.txt
+++ b/Documentation/devicetree/bindings/chosen.txt
@@ -79,9 +79,9 @@ a different secondary CPU release mechanism)
 linux,usable-memory-range
 -------------------------
 
-This property (arm64 only) holds a base address and size, describing a
-limited region in which memory may be considered available for use by
-the kernel. Memory outside of this range is not available for use.
+This property holds a base address and size, describing a limited region in
+which memory may be considered available for use by the kernel. Memory outside
+of this range is not available for use.
 
 This property describes a limitation: memory within this range is only
 valid when also described through another mechanism that the kernel
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 99be3e03af29089f..bc041d8141e86e62 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -956,6 +956,32 @@ static void __init early_init_dt_check_for_elfcorehdr(unsigned long node)
 		 elfcorehdr_addr, elfcorehdr_size);
 }
 
+static phys_addr_t cap_mem_addr;
+static phys_addr_t cap_mem_size;
+
+/**
+ * early_init_dt_check_for_usable_mem_range - Decode usable memory range
+ * location from flat tree
+ * @node: reference to node containing usable memory range location ('chosen')
+ */
+static void __init early_init_dt_check_for_usable_mem_range(unsigned long node)
+{
+	const __be32 *prop;
+	int len;
+
+	pr_debug("Looking for usable-memory-range property... ");
+
+	prop = of_get_flat_dt_prop(node, "linux,usable-memory-range", &len);
+	if (!prop || (len < (dt_root_addr_cells + dt_root_size_cells)))
+		return;
+
+	cap_mem_addr = dt_mem_next_cell(dt_root_addr_cells, &prop);
+	cap_mem_size = dt_mem_next_cell(dt_root_size_cells, &prop);
+
+	pr_debug("cap_mem_start=%pa cap_mem_size=%pa\n", &cap_mem_addr,
+		 &cap_mem_size);
+}
+
 #ifdef CONFIG_SERIAL_EARLYCON
 
 int __init early_init_dt_scan_chosen_stdout(void)
@@ -1104,6 +1130,7 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
 
 	early_init_dt_check_for_initrd(node);
 	early_init_dt_check_for_elfcorehdr(node);
+	early_init_dt_check_for_usable_mem_range(node);
 
 	/* Retrieve command line */
 	p = of_get_flat_dt_prop(node, "bootargs", &l);
@@ -1258,6 +1285,9 @@ void __init early_init_dt_scan_nodes(void)
 
 	/* Setup memory, calling early_init_dt_add_memory_arch */
 	of_scan_flat_dt(early_init_dt_scan_memory, NULL);
+
+	/* Handle linux,usable-memory-range property */
+	memblock_cap_memory_range(cap_mem_addr, cap_mem_size);
 }
 
 bool __init early_init_dt_scan(void *params)
-- 
2.25.1


  parent reply	other threads:[~2021-08-11  8:51 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-11  8:50 [PATCH v5 0/9] Add generic support for kdump DT properties Geert Uytterhoeven
2021-08-11  8:50 ` [PATCH v5 1/9] MIPS: Avoid future duplicate elf core header reservation Geert Uytterhoeven
2021-08-11 15:35   ` Geert Uytterhoeven
2021-08-16  5:52   ` Mike Rapoport
2021-08-23 10:17     ` Geert Uytterhoeven
2021-08-23 13:09       ` Mike Rapoport
2021-08-23 14:44         ` Rob Herring
2021-08-23 15:20           ` Mike Rapoport
2021-08-11  8:51 ` [PATCH v5 2/9] crash_dump: Make elfcorehdr address/size symbols always visible Geert Uytterhoeven
2021-08-11  8:51 ` [PATCH v5 3/9] of: fdt: Add generic support for handling elf core headers property Geert Uytterhoeven
2021-08-11  8:51 ` Geert Uytterhoeven [this message]
2021-08-11  8:51 ` [PATCH v5 5/9] of: fdt: Use IS_ENABLED(CONFIG_BLK_DEV_INITRD) instead of #ifdef Geert Uytterhoeven
2021-08-11  8:51 ` [PATCH v5 6/9] riscv: Remove non-standard linux,elfcorehdr handling Geert Uytterhoeven
2021-08-11  8:51 ` [PATCH v5 7/9] arm64: kdump: Remove custom " Geert Uytterhoeven
2021-08-23 12:55   ` Catalin Marinas
2021-08-11  8:51 ` [PATCH v5 8/9] arm64: kdump: Remove custom linux,usable-memory-range handling Geert Uytterhoeven
2021-08-23 12:55   ` Catalin Marinas
2021-08-11  8:51 ` [PATCH v5 9/9] ARM: uncompress: Parse "linux,usable-memory-range" DT property Geert Uytterhoeven
2021-08-15 15:25 ` [PATCH v5 0/9] Add generic support for kdump DT properties Rob Herring
2021-08-23 10:13   ` Geert Uytterhoeven
2021-08-23 14:52     ` Rob Herring
2021-08-24 11:55       ` Geert Uytterhoeven
2021-08-24 22:43         ` Rob Herring

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