linux-kernel - [PATCH] PCI: Add vf reset notification for pf

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Date: Sun, 4 Feb 2024 14:12:57 +0800
From: Emily Deng <Emily.Deng@....com>
To: <amd-gfx@...ts.freedesktop.org>, <bhelgaas@...gle.com>,
	<alex.williamson@...hat.com>, <linux-pci@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>
CC: Emily Deng <Emily.Deng@....com>
Subject: [PATCH] PCI: Add vf reset notification for pf

When a vf has been reset, the pf wants to get notification to remove the vf
out of schedule.

Solution:
Add the callback function in pci_driver sriov_vf_reset_notification. When
vf reset happens, then call this callback function.

Signed-off-by: Emily Deng <Emily.Deng@....com>
---
 drivers/pci/pci.c   | 8 ++++++++
 include/linux/pci.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 60230da957e0..aca937b05531 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4780,6 +4780,14 @@ EXPORT_SYMBOL_GPL(pcie_flr);
  */
 int pcie_reset_flr(struct pci_dev *dev, bool probe)
 {
+	struct pci_dev *pf_dev;
+
+	if (dev->is_virtfn) {
+		pf_dev = dev->physfn;
+		if (pf_dev->driver->sriov_vf_reset_notification)
+			pf_dev->driver->sriov_vf_reset_notification(pf_dev, dev);
+	}
+
 	if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET)
 		return -ENOTTY;
 
diff --git a/include/linux/pci.h b/include/linux/pci.h
index c69a2cc1f412..4fa31d9b0aa7 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -926,6 +926,7 @@ struct pci_driver {
 	int  (*sriov_configure)(struct pci_dev *dev, int num_vfs); /* On PF */
 	int  (*sriov_set_msix_vec_count)(struct pci_dev *vf, int msix_vec_count); /* On PF */
 	u32  (*sriov_get_vf_total_msix)(struct pci_dev *pf);
+	void  (*sriov_vf_reset_notification)(struct pci_dev *pf, struct pci_dev *vf);
 	const struct pci_error_handlers *err_handler;
 	const struct attribute_group **groups;
 	const struct attribute_group **dev_groups;
-- 
2.36.1