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Message-Id: <20240530163333.2458884-6-vladimir.oltean@nxp.com>
Date: Thu, 30 May 2024 19:33:30 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Claudiu Manoil <claudiu.manoil@....com>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
UNGLinuxDriver@...rochip.com,
Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Colin Foster <colin.foster@...advantage.com>,
Russell King <linux@...linux.org.uk>
Subject: [PATCH net-next 5/8] net: dsa: ocelot: move devm_request_threaded_irq() to felix_setup()
The current placement of devm_request_threaded_irq() is inconvenient.
It is between the allocation of the "felix" structure and
dsa_register_switch(), both of which we'd like to refactor into a
function that's common for all switches. But the IRQ is specific to
felix_vsc9959.
A closer inspection of the felix_irq_handler() code suggests that
it does things that depend on the data structures having been fully
initialized. For example, ocelot_get_txtstamp() takes
&port->tx_skbs.lock, which has only been initialized in
ocelot_init_port() which has not run yet.
It is not one of those IRQF_SHARED IRQs, so CONFIG_DEBUG_SHIRQ_FIXME
shouldn't apply here, and thus, it doesn't really matter, because in
practice, the IRQ will not be triggered so early. Nonetheless, it is a
good practice for the driver to be prepared for it to fire as soon as it
is requested.
Create a new felix->info method for running custom code for vsc9959 from
within felix_setup(), and move the request_irq() call there. The
ocelot_ext should have an IRQ as well, so this should be a step in the
right direction for that model (VSC7512) as well.
Some minor changes are made while moving the code. Casts from void *
aren't necessary, so drop them, and rename felix_irq_handler() to the
more specific vsc9959_irq_handler().
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
drivers/net/dsa/ocelot/felix.c | 9 ++++++
drivers/net/dsa/ocelot/felix.h | 1 +
drivers/net/dsa/ocelot/felix_vsc9959.c | 44 ++++++++++++++------------
3 files changed, 33 insertions(+), 21 deletions(-)
diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
index 3aa66bf9eafc..09c0800b18ab 100644
--- a/drivers/net/dsa/ocelot/felix.c
+++ b/drivers/net/dsa/ocelot/felix.c
@@ -1597,6 +1597,15 @@ static int felix_setup(struct dsa_switch *ds)
felix_port_qos_map_init(ocelot, dp->index);
}
+ if (felix->info->request_irq) {
+ err = felix->info->request_irq(ocelot);
+ if (err) {
+ dev_err(ocelot->dev, "Failed to request IRQ: %pe\n",
+ ERR_PTR(err));
+ goto out_deinit_ports;
+ }
+ }
+
err = ocelot_devlink_sb_register(ocelot);
if (err)
goto out_deinit_ports;
diff --git a/drivers/net/dsa/ocelot/felix.h b/drivers/net/dsa/ocelot/felix.h
index 4d3489aaa659..e67a25f6f816 100644
--- a/drivers/net/dsa/ocelot/felix.h
+++ b/drivers/net/dsa/ocelot/felix.h
@@ -64,6 +64,7 @@ struct felix_info {
const struct phylink_link_state *state);
int (*configure_serdes)(struct ocelot *ocelot, int port,
struct device_node *portnp);
+ int (*request_irq)(struct ocelot *ocelot);
};
/* Methods for initializing the hardware resources specific to a tagging
diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
index 34155a0ffd7e..20563abd617f 100644
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -2605,6 +2605,28 @@ static void vsc9959_cut_through_fwd(struct ocelot *ocelot)
}
}
+/* The INTB interrupt is shared between for PTP TX timestamp availability
+ * notification and MAC Merge status change on each port.
+ */
+static irqreturn_t vsc9959_irq_handler(int irq, void *data)
+{
+ struct ocelot *ocelot = data;
+
+ ocelot_get_txtstamp(ocelot);
+ ocelot_mm_irq(ocelot);
+
+ return IRQ_HANDLED;
+}
+
+static int vsc9959_request_irq(struct ocelot *ocelot)
+{
+ struct pci_dev *pdev = to_pci_dev(ocelot->dev);
+
+ return devm_request_threaded_irq(ocelot->dev, pdev->irq, NULL,
+ &vsc9959_irq_handler, IRQF_ONESHOT,
+ "felix-intb", ocelot);
+}
+
static const struct ocelot_ops vsc9959_ops = {
.reset = vsc9959_reset,
.wm_enc = vsc9959_wm_enc,
@@ -2645,21 +2667,9 @@ static const struct felix_info felix_info_vsc9959 = {
.port_modes = vsc9959_port_modes,
.port_setup_tc = vsc9959_port_setup_tc,
.port_sched_speed_set = vsc9959_sched_speed_set,
+ .request_irq = vsc9959_request_irq,
};
-/* The INTB interrupt is shared between for PTP TX timestamp availability
- * notification and MAC Merge status change on each port.
- */
-static irqreturn_t felix_irq_handler(int irq, void *data)
-{
- struct ocelot *ocelot = (struct ocelot *)data;
-
- ocelot_get_txtstamp(ocelot);
- ocelot_mm_irq(ocelot);
-
- return IRQ_HANDLED;
-}
-
static int felix_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
@@ -2690,14 +2700,6 @@ static int felix_pci_probe(struct pci_dev *pdev,
pci_set_master(pdev);
- err = devm_request_threaded_irq(dev, pdev->irq, NULL,
- &felix_irq_handler, IRQF_ONESHOT,
- "felix-intb", ocelot);
- if (err) {
- dev_err(dev, "Failed to request irq: %pe\n", ERR_PTR(err));
- goto out_disable;
- }
-
ocelot->ptp = 1;
ocelot->mm_supported = true;
--
2.34.1
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