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octeontx2-af: enforce single RVU AF probe

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On Octeon series SoCs, the AF is an integrated device within the SoC, and
hardware resources such as NPC, NIX and related blocks are global and
coordinated by the AF driver.  Physical and virtual functions request those
resources via AF mailbox messages, so two AF driver instances cannot both
own that global state; firmware exposes only one AF PCI function at boot
and any further octeontx2-af PCI probe returns -EBUSY so software matches
the single-AF model.

Signed-off-by: Ratheesh Kannoth <rkannoth@marvell.com>
Link: https://patch.msgid.link/20260609040453.711932-2-rkannoth@marvell.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ratheesh Kannoth 2026-06-09 09:34:45 +05:30 committed by Jakub Kicinski
parent 8d2747ab8c
commit 6056a11b8d
1 changed files with 13 additions and 1 deletions
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14
drivers/net/ethernet/marvell/octeontx2/af/rvu.c
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@ -3542,19 +3542,29 @@ static void rvu_update_module_params(struct rvu *rvu)
kpu_profile ? kpu_profile : default_pfl_name, KPU_NAME_LEN);
}
static atomic_t device_bound = ATOMIC_INIT(0);
static int rvu_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct device *dev = &pdev->dev;
struct rvu *rvu;
int err;
if (atomic_cmpxchg(&device_bound, 0, 1) != 0) {
dev_warn(dev, "Only one af device is supported.\n");
return -EBUSY;
}
rvu = devm_kzalloc(dev, sizeof(*rvu), GFP_KERNEL);
if (!rvu)
if (!rvu) {
atomic_set(&device_bound, 0);
return -ENOMEM;
}
rvu->hw = devm_kzalloc(dev, sizeof(struct rvu_hwinfo), GFP_KERNEL);
if (!rvu->hw) {
devm_kfree(dev, rvu);
atomic_set(&device_bound, 0);
return -ENOMEM;
}
@ -3687,6 +3697,7 @@ static int rvu_probe(struct pci_dev *pdev, const struct pci_device_id *id)
pci_set_drvdata(pdev, NULL);
devm_kfree(&pdev->dev, rvu->hw);
devm_kfree(dev, rvu);
atomic_set(&device_bound, 0);
return err;
}
@ -3716,6 +3727,7 @@ static void rvu_remove(struct pci_dev *pdev)
cn20k_free_mbox_memory(rvu);
kfree(rvu->ng_rvu);
devm_kfree(&pdev->dev, rvu);
atomic_set(&device_bound, 0);
}
static void rvu_shutdown(struct pci_dev *pdev)