[PATCH 06/10] PCI/DPC: Use FIELD_GET()

Bjorn Helgaas
2023-10-10T20:45:14Z

From: Bjorn Helgaas <bhelgaas@google.com>

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

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
drivers/pci/pcie/dpc.c | 9 +++++----
drivers/pci/quirks.c | 2 +-
include/uapi/linux/pci_regs.h | 1 +
3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index 3ceed8e3de41..6e551f34ec63 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -8,6 +8,7 @@

#define dev_fmt(fmt) "DPC: " fmt

+#include <linux/bitfield.h>
#include <linux/aer.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
@@ -202,7 +203,7 @@ static void dpc_process_rp_pio_error(struct pci_dev *pdev)

/* 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_STATUS_FIRST_ERR, dpc_status);

for (i = 0; i < ARRAY_SIZE(rp_pio_error_string); i++) {
if ((status & ~mask) & (1 << i))
@@ -270,8 +271,8 @@ void dpc_process_error(struct pci_dev *pdev)
pci_info(pdev, "containment event, status:%#06x source:%#06x\n",
status, source);

- reason = (status & PCI_EXP_DPC_STATUS_TRIGGER_RSN) >> 1;
- ext_reason = (status & PCI_EXP_DPC_STATUS_TRIGGER_RSN_EXT) >> 5;
+ reason = FIELD_GET(PCI_EXP_DPC_STATUS_TRIGGER_RSN, status);
+ ext_reason = FIELD_GET(PCI_EXP_DPC_STATUS_TRIGGER_RSN_EXT, status);
pci_warn(pdev, "%s detected\n",
(reason == 0) ? "unmasked uncorrectable error" :
(reason == 1) ? "ERR_NONFATAL" :
@@ -338,7 +339,7 @@ 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);
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index eeec1d6f9023..a9fdc2e3f110 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -6154,7 +6154,7 @@ static void dpc_log_size(struct pci_dev *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;
}
diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
index 833e5fb40ea5..e97a06b50f95 100644
--- a/include/uapi/linux/pci_regs.h
+++ b/include/uapi/linux/pci_regs.h
@@ -1046,6 +1046,7 @@
#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_STATUS_FIRST_ERR 0x1f00 /* RP PIO First Error Ptr */

#define PCI_EXP_DPC_SOURCE_ID 0x0A /* DPC Source Identifier */

--
2.34.1