linux-kernel - [PATCH 4/4] cxl/pci: Define a common function get_cxl

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Date: Wed, 22 May 2024 15:08:39 +0000
From: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
To: <linux-efi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-cxl@...r.kernel.org>
CC: Ard Biesheuvel <ardb@...nel.org>, Alison Schofield
	<alison.schofield@...el.com>, Vishal Verma <vishal.l.verma@...el.com>, "Ira
 Weiny" <ira.weiny@...el.com>, Dan Williams <dan.j.williams@...el.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>, Yazen Ghannam
	<yazen.ghannam@....com>, Bowman Terry <terry.bowman@....com>
Subject: [PATCH 4/4] cxl/pci: Define a common function get_cxl_dev()

Refactor computation of cxlds to a common function get_cxl_dev() and reuse
the function in both cxl_handle_cper_event() and cxl_handle_prot_err().

Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
---
 drivers/cxl/pci.c | 52 +++++++++++++++++++++++------------------------
 1 file changed, 26 insertions(+), 26 deletions(-)

diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
index 3e3c36983686..26e65e5b68cb 100644
--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -974,32 +974,43 @@ static struct pci_driver cxl_pci_driver = {
 	},
 };
 
+static struct cxl_dev_state *get_cxl_dev(u16 segment, u8 bus, u8 device,
+					 u8 function)
+{
+	struct pci_dev *pdev __free(pci_dev_put) = NULL;
+	struct cxl_dev_state *cxlds;
+	unsigned int devfn;
+
+	devfn = PCI_DEVFN(device, function);
+	pdev = pci_get_domain_bus_and_slot(segment, bus, devfn);
+
+	if (!pdev)
+		return NULL;
+
+	guard(device)(&pdev->dev);
+	if (pdev->driver != &cxl_pci_driver)
+		return NULL;
+
+	cxlds = pci_get_drvdata(pdev);
+
+	return cxlds;
+}
+
 #define CXL_EVENT_HDR_FLAGS_REC_SEVERITY GENMASK(1, 0)
 static void cxl_handle_cper_event(enum cxl_event_type ev_type,
 				  struct cxl_cper_event_rec *rec)
 {
 	struct cper_cxl_event_devid *device_id = &rec->hdr.device_id;
-	struct pci_dev *pdev __free(pci_dev_put) = NULL;
 	enum cxl_event_log_type log_type;
 	struct cxl_dev_state *cxlds;
-	unsigned int devfn;
 	u32 hdr_flags;
 
 	pr_debug("CPER event %d for device %u:%u:%u.%u\n", ev_type,
 		 device_id->segment_num, device_id->bus_num,
 		 device_id->device_num, device_id->func_num);
 
-	devfn = PCI_DEVFN(device_id->device_num, device_id->func_num);
-	pdev = pci_get_domain_bus_and_slot(device_id->segment_num,
-					   device_id->bus_num, devfn);
-	if (!pdev)
-		return;
-
-	guard(device)(&pdev->dev);
-	if (pdev->driver != &cxl_pci_driver)
-		return;
-
-	cxlds = pci_get_drvdata(pdev);
+	cxlds = get_cxl_dev(device_id->segment_num, device_id->bus_num,
+			    device_id->device_num, device_id->func_num);
 	if (!cxlds)
 		return;
 
@@ -1013,21 +1024,10 @@ static void cxl_handle_cper_event(enum cxl_event_type ev_type,
 
 static void cxl_handle_prot_err(struct cxl_cper_prot_err *p_err)
 {
-	struct pci_dev *pdev __free(pci_dev_put) = NULL;
 	struct cxl_dev_state *cxlds;
-	unsigned int devfn;
 
-	devfn = PCI_DEVFN(p_err->device, p_err->function);
-	pdev = pci_get_domain_bus_and_slot(p_err->segment,
-					   p_err->bus, devfn);
-	if (!pdev)
-		return;
-
-	guard(device)(&pdev->dev);
-	if (pdev->driver != &cxl_pci_driver)
-		return;
-
-	cxlds = pci_get_drvdata(pdev);
+	cxlds = get_cxl_dev(p_err->segment, p_err->bus,
+			    p_err->device, p_err->function);
 	if (!cxlds)
 		return;
 
-- 
2.17.1