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From: Stephen Boyd <sboyd@kernel.org>
To: Rob Herring <robh+dt@kernel.org>
Cc: linux-kernel@vger.kernel.org, patches@lists.linux.dev,
	linux-um@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org, kunit-dev@googlegroups.com,
	linux-kselftest@vger.kernel.org, devicetree@vger.kernel.org,
	Frank Rowand <frowand.list@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	Saurabh Sengar <ssengar@linux.microsoft.com>
Subject: [PATCH v3 4/7] x86/of: Unconditionally call unflatten_and_copy_device_tree()
Date: Fri,  2 Feb 2024 11:59:05 -0800	[thread overview]
Message-ID: <20240202195909.3458162-5-sboyd@kernel.org> (raw)
In-Reply-To: <20240202195909.3458162-1-sboyd@kernel.org>

Call this function unconditionally so that we can populate an empty DTB
on platforms that don't boot with a firmware provided or builtin DTB.
There's no harm in calling unflatten_device_tree() unconditionally here.
If there isn't a non-NULL 'initial_boot_params' pointer then
unflatten_device_tree() returns early.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: <x86@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Saurabh Sengar <ssengar@linux.microsoft.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
---
 arch/x86/kernel/devicetree.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index afd09924094e..650752d112a6 100644
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -283,22 +283,24 @@ void __init x86_flattree_get_config(void)
 	u32 size, map_len;
 	void *dt;
 
-	if (!initial_dtb)
-		return;
+	if (initial_dtb) {
+		map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
 
-	map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
+		dt = early_memremap(initial_dtb, map_len);
+		size = fdt_totalsize(dt);
+		if (map_len < size) {
+			early_memunmap(dt, map_len);
+			dt = early_memremap(initial_dtb, size);
+			map_len = size;
+		}
 
-	dt = early_memremap(initial_dtb, map_len);
-	size = fdt_totalsize(dt);
-	if (map_len < size) {
-		early_memunmap(dt, map_len);
-		dt = early_memremap(initial_dtb, size);
-		map_len = size;
+		early_init_dt_verify(dt);
 	}
 
-	early_init_dt_verify(dt);
 	unflatten_and_copy_device_tree();
-	early_memunmap(dt, map_len);
+
+	if (initial_dtb)
+		early_memunmap(dt, map_len);
 }
 #endif
 
-- 
https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git/
https://git.kernel.org/pub/scm/linux/kernel/git/sboyd/spmi.git


WARNING: multiple messages have this Message-ID (diff)
From: Stephen Boyd <sboyd@kernel.org>
To: Rob Herring <robh+dt@kernel.org>
Cc: linux-kernel@vger.kernel.org, patches@lists.linux.dev,
	linux-um@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org, kunit-dev@googlegroups.com,
	linux-kselftest@vger.kernel.org, devicetree@vger.kernel.org,
	Frank Rowand <frowand.list@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	Saurabh Sengar <ssengar@linux.microsoft.com>
Subject: [PATCH v3 4/7] x86/of: Unconditionally call unflatten_and_copy_device_tree()
Date: Fri,  2 Feb 2024 11:59:05 -0800	[thread overview]
Message-ID: <20240202195909.3458162-5-sboyd@kernel.org> (raw)
In-Reply-To: <20240202195909.3458162-1-sboyd@kernel.org>

Call this function unconditionally so that we can populate an empty DTB
on platforms that don't boot with a firmware provided or builtin DTB.
There's no harm in calling unflatten_device_tree() unconditionally here.
If there isn't a non-NULL 'initial_boot_params' pointer then
unflatten_device_tree() returns early.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: <x86@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Saurabh Sengar <ssengar@linux.microsoft.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
---
 arch/x86/kernel/devicetree.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index afd09924094e..650752d112a6 100644
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -283,22 +283,24 @@ void __init x86_flattree_get_config(void)
 	u32 size, map_len;
 	void *dt;
 
-	if (!initial_dtb)
-		return;
+	if (initial_dtb) {
+		map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
 
-	map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
+		dt = early_memremap(initial_dtb, map_len);
+		size = fdt_totalsize(dt);
+		if (map_len < size) {
+			early_memunmap(dt, map_len);
+			dt = early_memremap(initial_dtb, size);
+			map_len = size;
+		}
 
-	dt = early_memremap(initial_dtb, map_len);
-	size = fdt_totalsize(dt);
-	if (map_len < size) {
-		early_memunmap(dt, map_len);
-		dt = early_memremap(initial_dtb, size);
-		map_len = size;
+		early_init_dt_verify(dt);
 	}
 
-	early_init_dt_verify(dt);
 	unflatten_and_copy_device_tree();
-	early_memunmap(dt, map_len);
+
+	if (initial_dtb)
+		early_memunmap(dt, map_len);
 }
 #endif
 
-- 
https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git/
https://git.kernel.org/pub/scm/linux/kernel/git/sboyd/spmi.git


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  parent reply	other threads:[~2024-02-02 19:59 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-02-02 19:59 [PATCH v3 0/7] of: populate of_root node if bootloader doesn't Stephen Boyd
2024-02-02 19:59 ` Stephen Boyd
2024-02-02 19:59 ` [PATCH v3 1/7] of: Always unflatten in unflatten_and_copy_device_tree() Stephen Boyd
2024-02-02 19:59   ` Stephen Boyd
2024-02-02 19:59 ` [PATCH v3 2/7] of: Create of_root if no dtb provided by firmware Stephen Boyd
2024-02-02 19:59   ` Stephen Boyd
2024-02-02 19:59 ` [PATCH v3 3/7] um: Unconditionally call unflatten_device_tree() Stephen Boyd
2024-02-02 19:59   ` Stephen Boyd
2024-02-02 19:59 ` Stephen Boyd [this message]
2024-02-02 19:59   ` [PATCH v3 4/7] x86/of: Unconditionally call unflatten_and_copy_device_tree() Stephen Boyd
2024-02-02 19:59 ` [PATCH v3 5/7] arm64: Unconditionally call unflatten_device_tree() Stephen Boyd
2024-02-02 19:59   ` Stephen Boyd
2024-02-02 19:59 ` [PATCH v3 6/7] of: unittest: treat missing of_root as error instead of fixing up Stephen Boyd
2024-02-02 19:59   ` Stephen Boyd
2024-02-02 19:59 ` [PATCH v3 7/7] of: Add KUnit test to confirm DTB is loaded Stephen Boyd
2024-02-02 19:59   ` Stephen Boyd
2024-02-03  4:10   ` David Gow
2024-02-03  4:10     ` David Gow
2024-02-05 19:19     ` Stephen Boyd
2024-02-05 19:19       ` Stephen Boyd
2024-02-05 19:55       ` Geert Uytterhoeven
2024-02-05 19:55         ` Geert Uytterhoeven
2024-02-10  2:59         ` Stephen Boyd
2024-02-10  2:59           ` Stephen Boyd
2024-02-13 17:52           ` Rob Herring
2024-02-13 17:52             ` Rob Herring
2024-02-15 21:57             ` Stephen Boyd
2024-02-15 21:57               ` Stephen Boyd

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