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Subject[PATCH v16 5/9] PCI/DPC: Cache DPC capabilities in pci_init_capabilities()
Date
From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

Since we need to re-use DPC error handling routines in Error Disconnect
Recover (EDR) driver, move the initalization and caching of DPC
capabilities to pci_init_capabilities().

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
drivers/pci/pci.h | 2 ++
drivers/pci/pcie/dpc.c | 32 ++++++++++++++++++++------------
2 files changed, 22 insertions(+), 12 deletions(-)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index c2c35f152cde..e57e78b619f8 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -448,9 +448,11 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info);
#ifdef CONFIG_PCIE_DPC
void pci_save_dpc_state(struct pci_dev *dev);
void pci_restore_dpc_state(struct pci_dev *dev);
+void pci_dpc_init(struct pci_dev *pdev);
#else
static inline void pci_save_dpc_state(struct pci_dev *dev) {}
static inline void pci_restore_dpc_state(struct pci_dev *dev) {}
+static inline void pci_dpc_init(struct pci_dev *pdev) {}
#endif

#ifdef CONFIG_PCI_ATS
diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
index 114358d62ddf..57e7f94b98cf 100644
--- a/drivers/pci/pcie/dpc.c
+++ b/drivers/pci/pcie/dpc.c
@@ -249,6 +249,26 @@ static irqreturn_t dpc_irq(int irq, void *context)
return IRQ_HANDLED;
}

+void pci_dpc_init(struct pci_dev *pdev)
+{
+ u16 cap;
+
+ pdev->dpc_cap = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_DPC);
+ if (!pdev->dpc_cap)
+ return;
+
+ pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CAP, &cap);
+ pdev->dpc_rp_extensions = (cap & PCI_EXP_DPC_CAP_RP_EXT) ? 1 : 0;
+ if (pdev->dpc_rp_extensions) {
+ pdev->dpc_rp_log_size = (cap & PCI_EXP_DPC_RP_PIO_LOG_SIZE) >> 8;
+ 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);
+ pdev->dpc_rp_log_size = 0;
+ }
+ }
+}
+
#define FLAG(x, y) (((x) & (y)) ? '+' : '-')
static int dpc_probe(struct pcie_device *dev)
{
@@ -260,8 +280,6 @@ static int dpc_probe(struct pcie_device *dev)
if (pcie_aer_get_firmware_first(pdev) && !pcie_ports_dpc_native)
return -ENOTSUPP;

- pdev->dpc_cap = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_DPC);
-
status = devm_request_threaded_irq(device, dev->irq, dpc_irq,
dpc_handler, IRQF_SHARED,
"pcie-dpc", pdev);
@@ -274,16 +292,6 @@ static int dpc_probe(struct pcie_device *dev)
pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CAP, &cap);
pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, &ctl);

- pdev->dpc_rp_extensions = (cap & PCI_EXP_DPC_CAP_RP_EXT) ? 1 : 0;
- if (pdev->dpc_rp_extensions) {
- pdev->dpc_rp_log_size = (cap & PCI_EXP_DPC_RP_PIO_LOG_SIZE) >> 8;
- 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);
- pdev->dpc_rp_log_size = 0;
- }
- }
-
ctl = (ctl & 0xfff4) | PCI_EXP_DPC_CTL_EN_FATAL | PCI_EXP_DPC_CTL_INT_EN;
pci_write_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, ctl);

--
2.21.0
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