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
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next prev parent reply other threads:[~2021-08-11 9:14 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 ` [PATCH v5 8/9] arm64: kdump: Remove custom linux,usable-memory-range handling 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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