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Message-ID: <20251023071757.901181-7-den@valinux.co.jp>
Date: Thu, 23 Oct 2025 16:17:57 +0900
From: Koichiro Den <den@...inux.co.jp>
To: ntb@...ts.linux.dev,
linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: jdmason@...zu.us,
dave.jiang@...el.com,
allenbh@...il.com,
mani@...nel.org,
kwilczynski@...nel.org,
kishon@...nel.org,
bhelgaas@...gle.com,
jbrunet@...libre.com,
Frank.Li@....com,
lpieralisi@...nel.org,
yebin10@...wei.com,
geert+renesas@...der.be,
arnd@...db.de
Subject: [PATCH 6/6] PCI: endpoint: pci-epf-vntb: Manage ntb_dev lifetime and fix vpci bus teardown
Currently ntb_dev is embedded in epf_ntb, while configfs allows starting
or stopping controller and linking or unlinking functions as you want.
In fact, re-linking and re-starting is not possible with the embedded
design and leads to oopses.
Allocate ntb_dev with devm and add a .remove callback to the pci driver
that calls ntb_unregister_device(). This allows a fresh device to be
created on the next .bind call.
With these changes, the controller can now be stopped, a function
unlinked, configfs settings updated, and the controller re-linked and
restarted without rebooting the endpoint, as long as the underlying
pci_epc_ops .stop() operation is non-destructive, and .start() can
restore normal operations.
Signed-off-by: Koichiro Den <den@...inux.co.jp>
---
drivers/pci/endpoint/functions/pci-epf-vntb.c | 66 +++++++++++++++----
1 file changed, 52 insertions(+), 14 deletions(-)
diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c
index 750a246f79c9..3059ed85a955 100644
--- a/drivers/pci/endpoint/functions/pci-epf-vntb.c
+++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c
@@ -118,7 +118,7 @@ struct epf_ntb_ctrl {
} __packed;
struct epf_ntb {
- struct ntb_dev ntb;
+ struct ntb_dev *ntb;
struct pci_epf *epf;
struct config_group group;
@@ -144,10 +144,16 @@ struct epf_ntb {
void __iomem *vpci_mw_addr[MAX_MW];
struct delayed_work cmd_handler;
+
+ struct pci_bus *vpci_bus;
};
#define to_epf_ntb(epf_group) container_of((epf_group), struct epf_ntb, group)
-#define ntb_ndev(__ntb) container_of(__ntb, struct epf_ntb, ntb)
+
+static inline struct epf_ntb *ntb_ndev(struct ntb_dev *ntb)
+{
+ return (struct epf_ntb *)ntb->pdev->sysdata;
+}
static struct pci_epf_header epf_ntb_header = {
.vendorid = PCI_ANY_ID,
@@ -173,7 +179,7 @@ static int epf_ntb_link_up(struct epf_ntb *ntb, bool link_up)
else
ntb->reg->link_status &= ~LINK_STATUS_UP;
- ntb_link_event(&ntb->ntb);
+ ntb_link_event(ntb->ntb);
return 0;
}
@@ -261,7 +267,7 @@ static void epf_ntb_cmd_handler(struct work_struct *work)
for (i = 1; i < ntb->db_count; i++) {
if (ntb->epf_db[i]) {
ntb->db |= 1 << (i - 1);
- ntb_db_event(&ntb->ntb, i);
+ ntb_db_event(ntb->ntb, i);
ntb->epf_db[i] = 0;
}
}
@@ -1097,12 +1103,24 @@ static int vpci_scan_bus(void *sysdata)
{
struct pci_bus *vpci_bus;
struct epf_ntb *ndev = sysdata;
-
- vpci_bus = pci_scan_bus(ndev->vbus_number, &vpci_ops, sysdata);
+ LIST_HEAD(resources);
+ static struct resource busn_res = {
+ .start = 0,
+ .end = 255,
+ .flags = IORESOURCE_BUS,
+ };
+
+ pci_add_resource(&resources, &ioport_resource);
+ pci_add_resource(&resources, &iomem_resource);
+ pci_add_resource(&resources, &busn_res);
+
+ vpci_bus = pci_scan_root_bus(&ndev->epf->epc->dev, ndev->vbus_number,
+ &vpci_ops, sysdata, &resources);
if (!vpci_bus) {
pr_err("create pci bus failed\n");
return -EINVAL;
}
+ ndev->vpci_bus = vpci_bus;
pci_bus_add_devices(vpci_bus);
@@ -1147,7 +1165,7 @@ static int vntb_epf_mw_set_trans(struct ntb_dev *ndev, int pidx, int idx,
int ret;
struct device *dev;
- dev = &ntb->ntb.dev;
+ dev = &ntb->ntb->dev;
barno = ntb->epf_ntb_bar[BAR_MW1 + idx];
epf_bar = &ntb->epf->bar[barno];
epf_bar->phys_addr = addr;
@@ -1247,7 +1265,7 @@ static int vntb_epf_peer_db_set(struct ntb_dev *ndev, u64 db_bits)
ret = pci_epc_raise_irq(ntb->epf->epc, func_no, vfunc_no,
PCI_IRQ_MSI, interrupt_num + 1);
if (ret)
- dev_err(&ntb->ntb.dev, "Failed to raise IRQ\n");
+ dev_err(&ntb->ntb->dev, "Failed to raise IRQ\n");
return ret;
}
@@ -1334,9 +1352,12 @@ static int pci_vntb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
struct epf_ntb *ndev = (struct epf_ntb *)pdev->sysdata;
struct device *dev = &pdev->dev;
- ndev->ntb.pdev = pdev;
- ndev->ntb.topo = NTB_TOPO_NONE;
- ndev->ntb.ops = &vntb_epf_ops;
+ ndev->ntb = devm_kzalloc(dev, sizeof(*ndev->ntb), GFP_KERNEL);
+ if (!ndev->ntb)
+ return -ENOMEM;
+ ndev->ntb->pdev = pdev;
+ ndev->ntb->topo = NTB_TOPO_NONE;
+ ndev->ntb->ops = &vntb_epf_ops;
ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
if (ret) {
@@ -1344,7 +1365,7 @@ static int pci_vntb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
return ret;
}
- ret = ntb_register_device(&ndev->ntb);
+ ret = ntb_register_device(ndev->ntb);
if (ret) {
dev_err(dev, "Failed to register NTB device\n");
return ret;
@@ -1354,6 +1375,17 @@ static int pci_vntb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
return 0;
}
+static void pci_vntb_remove(struct pci_dev *pdev)
+{
+ struct epf_ntb *ndev = (struct epf_ntb *)pdev->sysdata;
+
+ if (!ndev || !ndev->ntb)
+ return;
+
+ ntb_unregister_device(ndev->ntb);
+ ndev->ntb = NULL;
+}
+
static struct pci_device_id pci_vntb_table[] = {
{
PCI_DEVICE(0xffff, 0xffff),
@@ -1365,6 +1397,7 @@ static struct pci_driver vntb_pci_driver = {
.name = "pci-vntb",
.id_table = pci_vntb_table,
.probe = pci_vntb_probe,
+ .remove = pci_vntb_remove,
};
/* ============ PCIe EPF Driver Bind ====================*/
@@ -1447,10 +1480,15 @@ static void epf_ntb_unbind(struct pci_epf *epf)
{
struct epf_ntb *ntb = epf_get_drvdata(epf);
+ pci_unregister_driver(&vntb_pci_driver);
+
+ pci_lock_rescan_remove();
+ pci_stop_root_bus(ntb->vpci_bus);
+ pci_remove_root_bus(ntb->vpci_bus);
+ pci_unlock_rescan_remove();
+
epf_ntb_epc_cleanup(ntb);
epf_ntb_config_spad_bar_free(ntb);
-
- pci_unregister_driver(&vntb_pci_driver);
}
// EPF driver probe
--
2.48.1
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