[PATCH 6.1 077/141] PCI/DPC: Use FIELD_GET()

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6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>

[ Upstream commit 9a9eec4765737b9b2a8d6ae03de6480a5f12dd5c ]

Use FIELD_GET() to remove dependencies on the field position, i.e., the
shift value. No functional change intended.

Link: https://lore.kernel.org/r/20231018113254.17616-5-ilpo.jarvinen@xxxxxxxxxxxxxxx
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/pci/pcie/dpc.c        |    5 +++--
 drivers/pci/quirks.c          |    2 +-
 include/uapi/linux/pci_regs.h |    1 +
 3 files changed, 5 insertions(+), 3 deletions(-)

--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -9,6 +9,7 @@
 #define dev_fmt(fmt) "DPC: " fmt
 
 #include <linux/aer.h>
+#include <linux/bitfield.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
@@ -203,7 +204,7 @@ static void dpc_process_rp_pio_error(str
 
 	/* Get First Error Pointer */
 	pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &dpc_status);
-	first_error = (dpc_status & 0x1f00) >> 8;
+	first_error = FIELD_GET(PCI_EXP_DPC_RP_PIO_FEP, dpc_status);
 
 	for (i = 0; i < ARRAY_SIZE(rp_pio_error_string); i++) {
 		if ((status & ~mask) & (1 << i))
@@ -339,7 +340,7 @@ void pci_dpc_init(struct pci_dev *pdev)
 	/* Quirks may set dpc_rp_log_size if device or firmware is buggy */
 	if (!pdev->dpc_rp_log_size) {
 		pdev->dpc_rp_log_size =
-			(cap & PCI_EXP_DPC_RP_PIO_LOG_SIZE) >> 8;
+				FIELD_GET(PCI_EXP_DPC_RP_PIO_LOG_SIZE, cap);
 		if (pdev->dpc_rp_log_size < 4 || pdev->dpc_rp_log_size > 9) {
 			pci_err(pdev, "RP PIO log size %u is invalid\n",
 				pdev->dpc_rp_log_size);
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -6105,7 +6105,7 @@ static void dpc_log_size(struct pci_dev
 	if (!(val & PCI_EXP_DPC_CAP_RP_EXT))
 		return;
 
-	if (!((val & PCI_EXP_DPC_RP_PIO_LOG_SIZE) >> 8)) {
+	if (FIELD_GET(PCI_EXP_DPC_RP_PIO_LOG_SIZE, val) == 0) {
 		pci_info(dev, "Overriding RP PIO Log Size to 4\n");
 		dev->dpc_rp_log_size = 4;
 	}
--- a/include/uapi/linux/pci_regs.h
+++ b/include/uapi/linux/pci_regs.h
@@ -1043,6 +1043,7 @@
 #define  PCI_EXP_DPC_STATUS_INTERRUPT	    0x0008 /* Interrupt Status */
 #define  PCI_EXP_DPC_RP_BUSY		    0x0010 /* Root Port Busy */
 #define  PCI_EXP_DPC_STATUS_TRIGGER_RSN_EXT 0x0060 /* Trig Reason Extension */
+#define  PCI_EXP_DPC_RP_PIO_FEP		    0x1f00 /* RP PIO First Err Ptr */
 
 #define PCI_EXP_DPC_SOURCE_ID		 0x0A	/* DPC Source Identifier */
 






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