linux-kernel - [PATCH 09/16] x86/amd_nb, x86/amd_node: Simplify amd_pci_dev_to_node

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Message-ID: <20241023172150.659002-10-yazen.ghannam@amd.com>
Date: Wed, 23 Oct 2024 17:21:43 +0000
From: Yazen Ghannam <yazen.ghannam@....com>
To: <linux-edac@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>, <tony.luck@...el.com>, <x86@...nel.org>,
	<avadhut.naik@....com>, <john.allen@....com>, <mario.limonciello@....com>,
	<bhelgaas@...gle.com>, <Shyam-sundar.S-k@....com>, <richard.gong@....com>,
	<jdelvare@...e.com>, <linux@...ck-us.net>, <clemens@...isch.de>,
	<hdegoede@...hat.com>, <ilpo.jarvinen@...ux.intel.com>,
	<linux-pci@...r.kernel.org>, <linux-hwmon@...r.kernel.org>,
	<platform-driver-x86@...r.kernel.org>, <naveenkrishna.chatradhi@....com>,
	<carlos.bilbao.osdev@...il.com>, Yazen Ghannam <yazen.ghannam@....com>
Subject: [PATCH 09/16] x86/amd_nb, x86/amd_node: Simplify amd_pci_dev_to_node_id()

From: Mario Limonciello <mario.limonciello@....com>

amd_pci_dev_to_node_id() tries to find the AMD node ID of a device by
searching and counting devices.

The AMD node ID of an AMD node device is simply its slot number minus
the AMD node 0 slot number.

Simplify this function and move it to amd_node.h.

[Yazen: Update commit message and simplify function]

Signed-off-by: Mario Limonciello <mario.limonciello@....com>
Co-developed-by: Yazen Ghannam <yazen.ghannam@....com>
Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
 arch/x86/include/asm/amd_nb.h   | 17 -----------------
 arch/x86/include/asm/amd_node.h |  6 ++++++
 2 files changed, 6 insertions(+), 17 deletions(-)

diff --git a/arch/x86/include/asm/amd_nb.h b/arch/x86/include/asm/amd_nb.h
index a0f2182107b0..b3b42e585655 100644
--- a/arch/x86/include/asm/amd_nb.h
+++ b/arch/x86/include/asm/amd_nb.h
@@ -52,23 +52,6 @@ u16 amd_nb_num(void);
 bool amd_nb_has_feature(unsigned int feature);
 struct amd_northbridge *node_to_amd_nb(int node);
 
-static inline u16 amd_pci_dev_to_node_id(struct pci_dev *pdev)
-{
-	struct pci_dev *misc;
-	int i;
-
-	for (i = 0; i != amd_nb_num(); i++) {
-		misc = node_to_amd_nb(i)->misc;
-
-		if (pci_domain_nr(misc->bus) == pci_domain_nr(pdev->bus) &&
-		    PCI_SLOT(misc->devfn) == PCI_SLOT(pdev->devfn))
-			return i;
-	}
-
-	WARN(1, "Unable to find AMD Northbridge id for %s\n", pci_name(pdev));
-	return 0;
-}
-
 static inline bool amd_gart_present(void)
 {
 	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
diff --git a/arch/x86/include/asm/amd_node.h b/arch/x86/include/asm/amd_node.h
index 419a0ad13ef2..8e473a293706 100644
--- a/arch/x86/include/asm/amd_node.h
+++ b/arch/x86/include/asm/amd_node.h
@@ -30,4 +30,10 @@ static inline u16 amd_num_nodes(void)
 	return topology_amd_nodes_per_pkg() * topology_max_packages();
 }
 
+/* Caller must ensure the input is an AMD node device. */
+static inline u16 amd_pci_dev_to_node_id(struct pci_dev *pdev)
+{
+	return PCI_SLOT(pdev->devfn) - AMD_NODE0_PCI_SLOT;
+}
+
 #endif /*_ASM_X86_AMD_NODE_H_*/
-- 
2.43.0