linux-kernel - [PATCH v2 09/16] x86/amd_nb, hwmon: (k10temp): Simplify amd_pci_dev_to_node

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Message-ID: <20241206161210.163701-10-yazen.ghannam@amd.com>
Date: Fri, 6 Dec 2024 16:12:02 +0000
From: Yazen Ghannam <yazen.ghannam@....com>
To: <yazen.ghannam@....com>, <x86@...nel.org>, Tony Luck
	<tony.luck@...el.com>, Mario Limonciello <mario.limonciello@....com>, "Bjorn
 Helgaas" <bhelgaas@...gle.com>, Jean Delvare <jdelvare@...e.com>, "Guenter
 Roeck" <linux@...ck-us.net>, Clemens Ladisch <clemens@...isch.de>, "Shyam
 Sundar S K" <Shyam-sundar.S-k@....com>, Hans de Goede <hdegoede@...hat.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, "Naveen
 Krishna Chatradhi" <naveenkrishna.chatradhi@....com>, Suma Hegde
	<suma.hegde@....com>
CC: <linux-kernel@...r.kernel.org>, <linux-edac@...r.kernel.org>,
	<linux-pci@...r.kernel.org>, <linux-hwmon@...r.kernel.org>,
	<platform-driver-x86@...r.kernel.org>
Subject: [PATCH v2 09/16] x86/amd_nb, hwmon: (k10temp): 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 k10temp.c.

[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>
---

Notes:
    Link:
    https://lore.kernel.org/20241023172150.659002-10-yazen.ghannam@amd.com
    
    v1->v2:
    * Move simplified function to k10temp.c.
     * Based on the original idea from Mario.
     * This can be removed when reworking k10temp.

 arch/x86/include/asm/amd_nb.h | 17 -----------------
 drivers/hwmon/k10temp.c       |  5 +++++
 2 files changed, 5 insertions(+), 17 deletions(-)

diff --git a/arch/x86/include/asm/amd_nb.h b/arch/x86/include/asm/amd_nb.h
index 31547108de1a..066dc3801430 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/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
index 7dc19c5d62ac..cefa8cd184c8 100644
--- a/drivers/hwmon/k10temp.c
+++ b/drivers/hwmon/k10temp.c
@@ -150,6 +150,11 @@ static void read_tempreg_nb_f15(struct pci_dev *pdev, u32 *regval)
 			  F15H_M60H_REPORTED_TEMP_CTRL_OFFSET, regval);
 }
 
+static u16 amd_pci_dev_to_node_id(struct pci_dev *pdev)
+{
+	return PCI_SLOT(pdev->devfn) - AMD_NODE0_PCI_SLOT;
+}
+
 static void read_tempreg_nb_zen(struct pci_dev *pdev, u32 *regval)
 {
 	if (amd_smn_read(amd_pci_dev_to_node_id(pdev),
-- 
2.43.0