netdev - [PATCH net-next 1/3] pds_core: add simple AER handler

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Message-ID: <20240216222952.72400-2-shannon.nelson@amd.com>
Date: Fri, 16 Feb 2024 14:29:50 -0800
From: Shannon Nelson <shannon.nelson@....com>
To: <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>,
	<edumazet@...gle.com>, <pabeni@...hat.com>
CC: <brett.creeley@....com>, <drivers@...sando.io>, Shannon Nelson
	<shannon.nelson@....com>
Subject: [PATCH net-next 1/3] pds_core: add simple AER handler

Set up the pci_error_handlers error_detected and resume to be
useful in handling AER events.

Reviewed-by: Brett Creeley <brett.creeley@....com>
Signed-off-by: Shannon Nelson <shannon.nelson@....com>
---
 drivers/net/ethernet/amd/pds_core/main.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/net/ethernet/amd/pds_core/main.c b/drivers/net/ethernet/amd/pds_core/main.c
index 0050c5894563..e10451a5a89b 100644
--- a/drivers/net/ethernet/amd/pds_core/main.c
+++ b/drivers/net/ethernet/amd/pds_core/main.c
@@ -45,6 +45,7 @@ static void pdsc_unmap_bars(struct pdsc *pdsc)
 	for (i = 0; i < PDS_CORE_BARS_MAX; i++) {
 		if (bars[i].vaddr)
 			pci_iounmap(pdsc->pdev, bars[i].vaddr);
+		bars[i].vaddr = NULL;
 	}
 }
 
@@ -512,10 +513,33 @@ void pdsc_reset_done(struct pci_dev *pdev)
 	pdsc_restart_health_thread(pdsc);
 }
 
+static pci_ers_result_t pdsc_pci_error_detected(struct pci_dev *pdev,
+						pci_channel_state_t error)
+{
+	if (error == pci_channel_io_frozen) {
+		pdsc_reset_prepare(pdev);
+		return PCI_ERS_RESULT_NEED_RESET;
+	}
+
+	return PCI_ERS_RESULT_NONE;
+}
+
+static void pdsc_pci_error_resume(struct pci_dev *pdev)
+{
+	struct pdsc *pdsc = pci_get_drvdata(pdev);
+
+	if (test_bit(PDSC_S_FW_DEAD, &pdsc->state))
+		pci_reset_function_locked(pdev);
+}
+
 static const struct pci_error_handlers pdsc_err_handler = {
 	/* FLR handling */
 	.reset_prepare      = pdsc_reset_prepare,
 	.reset_done         = pdsc_reset_done,
+
+	/* AER handling */
+	.error_detected     = pdsc_pci_error_detected,
+	.resume             = pdsc_pci_error_resume,
 };
 
 static struct pci_driver pdsc_driver = {
-- 
2.17.1