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Message-Id: <20241030-feature_poe_port_prio-v2-13-9559622ee47a@bootlin.com>
Date: Wed, 30 Oct 2024 17:53:15 +0100
From: Kory Maincent <kory.maincent@...tlin.com>
To: Andrew Lunn <andrew@...n.ch>, Oleksij Rempel <o.rempel@...gutronix.de>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Jonathan Corbet <corbet@....net>, Donald Hunter <donald.hunter@...il.com>,
Rob Herring <robh@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>,
Simon Horman <horms@...nel.org>, Heiner Kallweit <hkallweit1@...il.com>,
Russell King <linux@...linux.org.uk>, Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
linux-doc@...r.kernel.org, Kyle Swenson <kyle.swenson@....tech>,
Dent Project <dentproject@...uxfoundation.org>, kernel@...gutronix.de,
Maxime Chevallier <maxime.chevallier@...tlin.com>,
Kory Maincent <kory.maincent@...tlin.com>
Subject: [PATCH RFC net-next v2 13/18] net: pse-pd: Add support for PSE
power domains
From: Kory Maincent (Dent Project) <kory.maincent@...tlin.com>
Introduce PSE power domain support in preparation for future port
priority features. Multiple PSE PIs are grouped under a PSE power
domain, which defines the available power budget. This setup allows
the system to check whether activating a port would exceed the
budget, helping prevent over-budget states.
Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
---
Changes in v2:
- new patch.
---
drivers/net/pse-pd/pse_core.c | 121 ++++++++++++++++++++++++++++++++++++++++++
include/linux/pse-pd/pse.h | 2 +
2 files changed, 123 insertions(+)
diff --git a/drivers/net/pse-pd/pse_core.c b/drivers/net/pse-pd/pse_core.c
index 712cb2d9c7c4..13f6ddcfca10 100644
--- a/drivers/net/pse-pd/pse_core.c
+++ b/drivers/net/pse-pd/pse_core.c
@@ -15,6 +15,7 @@
static DEFINE_MUTEX(pse_list_mutex);
static LIST_HEAD(pse_controller_list);
static DEFINE_IDA(pse_ida);
+static DEFINE_XARRAY_ALLOC(pse_pw_d_map);
/**
* struct pse_control - a PSE control
@@ -35,6 +36,12 @@ struct pse_control {
struct phy_device *attached_phydev;
};
+struct pse_power_domain {
+ int id;
+ struct regulator *supply;
+ int pw_budget;
+};
+
static int of_load_single_pse_pi_pairset(struct device_node *node,
struct pse_pi *pi,
int pairset_num)
@@ -431,6 +438,115 @@ devm_pse_pi_regulator_register(struct pse_controller_dev *pcdev,
return 0;
}
+static void pse_flush_pw_ds(struct pse_controller_dev *pcdev)
+{
+ struct pse_power_domain *pw_d;
+ int i;
+
+ for (i = 0; i < pcdev->nr_lines; i++) {
+ pw_d = xa_load(&pse_pw_d_map, pcdev->pi[i].pw_d->id);
+ if (pw_d) {
+ regulator_put(pw_d->supply);
+ xa_erase(&pse_pw_d_map, pw_d->id);
+ }
+ }
+}
+
+static struct pse_power_domain *devm_pse_alloc_pw_d(struct device *dev)
+{
+ struct pse_power_domain *pw_d;
+ int index, ret;
+
+ pw_d = devm_kzalloc(dev, sizeof(*pw_d), GFP_KERNEL);
+ if (!pw_d)
+ return ERR_PTR(-ENOMEM);
+
+ ret = xa_alloc(&pse_pw_d_map, &index, pw_d, xa_limit_31b, GFP_KERNEL);
+ if (ret)
+ return ERR_PTR(ret);
+
+ pw_d->id = index;
+ return pw_d;
+}
+
+static int pse_get_power_budget(struct regulator *supply)
+{
+ int ret, uV;
+ s64 tmp_64;
+
+ ret = regulator_get_voltage(supply);
+ if (ret < 0)
+ return ret;
+
+ uV = ret;
+ ret = regulator_get_power_budget(supply);
+ if (ret < 0)
+ return ret;
+
+ tmp_64 = ret;
+ tmp_64 *= uV;
+ /* mW = uV * uA / 1000000000 */
+ return DIV_ROUND_CLOSEST_ULL(tmp_64, 1000000000);
+}
+
+static int pse_register_pw_ds(struct pse_controller_dev *pcdev)
+{
+ int i, ret;
+
+ for (i = 0; i < pcdev->nr_lines; i++) {
+ struct regulator_dev *rdev = pcdev->pi[i].rdev;
+ struct pse_power_domain *pw_d;
+ struct regulator *supply;
+ bool present = false;
+ unsigned long index;
+ int pw_budget;
+
+ /* No regulator or regulator parent supply registered.
+ * We need a regulator parent to register a PSE power domain
+ */
+ if (!rdev || !rdev->supply)
+ continue;
+
+ xa_for_each(&pse_pw_d_map, index, pw_d) {
+ /* Power supply already registered as a PSE power
+ * domain.
+ */
+ if (pw_d->supply == rdev->supply) {
+ present = true;
+ pcdev->pi[i].pw_d = pw_d;
+ break;
+ }
+ }
+ if (present)
+ break;
+
+ ret = pse_get_power_budget(rdev->supply);
+ if (ret < 0) {
+ dev_warn(pcdev->dev,
+ "can't read power budget from PI %d, no power domain will be associated\n",
+ i);
+ continue;
+ }
+ pw_budget = ret;
+
+ pw_d = devm_pse_alloc_pw_d(pcdev->dev);
+ if (IS_ERR_OR_NULL(pw_d))
+ return PTR_ERR(pw_d);
+
+ pw_d->pw_budget = pw_budget;
+ supply = regulator_get(pcdev->dev, rdev->supply_name);
+ if (IS_ERR(supply)) {
+ xa_erase(&pse_pw_d_map, pw_d->id);
+ return PTR_ERR(supply);
+ }
+
+ pw_d->supply = rdev->supply;
+ pcdev->pi[i].pw_d = pw_d;
+ }
+
+ return 0;
+}
+
/**
* pse_controller_register - register a PSE controller device
* @pcdev: a pointer to the initialized PSE controller device
@@ -489,6 +605,10 @@ int pse_controller_register(struct pse_controller_dev *pcdev)
goto free_pse_ida;
}
+ ret = pse_register_pw_ds(pcdev);
+ if (ret)
+ goto free_pse_ida;
+
mutex_lock(&pse_list_mutex);
list_add(&pcdev->list, &pse_controller_list);
mutex_unlock(&pse_list_mutex);
@@ -508,6 +628,7 @@ EXPORT_SYMBOL_GPL(pse_controller_register);
void pse_controller_unregister(struct pse_controller_dev *pcdev)
{
pse_release_pis(pcdev);
+ pse_flush_pw_ds(pcdev);
ida_free(&pse_ida, pcdev->id);
mutex_lock(&pse_list_mutex);
list_del(&pcdev->list);
diff --git a/include/linux/pse-pd/pse.h b/include/linux/pse-pd/pse.h
index ce8737c2219a..3b35dc0f8dc3 100644
--- a/include/linux/pse-pd/pse.h
+++ b/include/linux/pse-pd/pse.h
@@ -138,12 +138,14 @@ struct pse_pi_pairset {
* @np: device node pointer of the PSE PI node
* @rdev: regulator represented by the PSE PI
* @admin_state_enabled: PI enabled state
+ * @pw_d: Power domain of the PSE PI
*/
struct pse_pi {
struct pse_pi_pairset pairset[2];
struct device_node *np;
struct regulator_dev *rdev;
bool admin_state_enabled;
+ struct pse_power_domain *pw_d;
};
/**
--
2.34.1
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