[PATCH iwl-net 0/3] ice: Fix incorrect input/output pin behavior

[PATCH iwl-net 0/3] ice: Fix incorrect input/output pin behavior

[Karol Kolacinski]

This patch series fixes incorrect external timestamps handling, which
may result in kernel crashes or not requested extts/perout behavior.

Jacob Keller (2):
  ice: Don't process extts if PTP is disabled
  ice: Reject pin requests with unsupported flags

Milena Olech (1):
  ice: Fix improper extts handling

 drivers/net/ethernet/intel/ice/ice_ptp.c | 137 +++++++++++++++++------
 drivers/net/ethernet/intel/ice/ice_ptp.h |   9 ++
 2 files changed, 113 insertions(+), 33 deletions(-)


base-commit: dea9bffd24e4d556bb05511d60ae78c302e66b4f
-- 
2.43.0

[PATCH iwl-net 1/3] ice: Fix improper extts handling

[Karol Kolacinski]

From: Milena Olech <milena.olech@intel.com>

Extts events are disabled and enabled by the application ts2phc.
However, in case where the driver is removed when the application is
running, channel remains enabled. As a result, in the next run of the
app, two channels are enabled and the information "extts on unexpected
channel" is printed to the user.

To avoid that, extts events shall be disabled when PTP is released.

Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Co-developed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Milena Olech <milena.olech@intel.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_ptp.c | 106 ++++++++++++++++++-----
 drivers/net/ethernet/intel/ice/ice_ptp.h |   8 ++
 2 files changed, 92 insertions(+), 22 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index 0f17fc1181d2..30f1f910e6d9 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -1584,27 +1584,24 @@ void ice_ptp_extts_event(struct ice_pf *pf)
 /**
  * ice_ptp_cfg_extts - Configure EXTTS pin and channel
  * @pf: Board private structure
- * @ena: true to enable; false to disable
  * @chan: GPIO channel (0-3)
- * @gpio_pin: GPIO pin
- * @extts_flags: request flags from the ptp_extts_request.flags
- */
-static int
-ice_ptp_cfg_extts(struct ice_pf *pf, bool ena, unsigned int chan, u32 gpio_pin,
-		  unsigned int extts_flags)
+ * @config: desired EXTTS configuration.
+ * @store: If set to true, the values will be stored
+ *
+ * Configure an external timestamp event on the requested channel.
+  */
+static void ice_ptp_cfg_extts(struct ice_pf *pf, unsigned int chan,
+			      struct ice_extts_channel *config, bool store)
 {
 	u32 func, aux_reg, gpio_reg, irq_reg;
 	struct ice_hw *hw = &pf->hw;
 	u8 tmr_idx;
 
-	if (chan > (unsigned int)pf->ptp.info.n_ext_ts)
-		return -EINVAL;
-
 	tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
 
 	irq_reg = rd32(hw, PFINT_OICR_ENA);
 
-	if (ena) {
+	if (config->ena) {
 		/* Enable the interrupt */
 		irq_reg |= PFINT_OICR_TSYN_EVNT_M;
 		aux_reg = GLTSYN_AUX_IN_0_INT_ENA_M;
@@ -1613,9 +1610,9 @@ ice_ptp_cfg_extts(struct ice_pf *pf, bool ena, unsigned int chan, u32 gpio_pin,
 #define GLTSYN_AUX_IN_0_EVNTLVL_FALLING_EDGE	BIT(1)
 
 		/* set event level to requested edge */
-		if (extts_flags & PTP_FALLING_EDGE)
+		if (config->flags  & PTP_FALLING_EDGE)
 			aux_reg |= GLTSYN_AUX_IN_0_EVNTLVL_FALLING_EDGE;
-		if (extts_flags & PTP_RISING_EDGE)
+		if (config->flags  & PTP_RISING_EDGE)
 			aux_reg |= GLTSYN_AUX_IN_0_EVNTLVL_RISING_EDGE;
 
 		/* Write GPIO CTL reg.
@@ -1636,9 +1633,48 @@ ice_ptp_cfg_extts(struct ice_pf *pf, bool ena, unsigned int chan, u32 gpio_pin,
 
 	wr32(hw, PFINT_OICR_ENA, irq_reg);
 	wr32(hw, GLTSYN_AUX_IN(chan, tmr_idx), aux_reg);
-	wr32(hw, GLGEN_GPIO_CTL(gpio_pin), gpio_reg);
+	wr32(hw, GLGEN_GPIO_CTL(config->gpio_pin), gpio_reg);
 
-	return 0;
+	if (store)
+		memcpy(&pf->ptp.extts_channels[chan], config, sizeof(*config));
+}
+
+/**
+ * ice_ptp_disable_all_extts - Disable all EXTTS channels
+ * @pf: Board private structure
+ */
+static void ice_ptp_disable_all_extts(struct ice_pf *pf)
+{
+	struct ice_extts_channel extts_cfg = {};
+	int i;
+
+	for (i = 0; i < pf->ptp.info.n_ext_ts; i++) {
+		if (pf->ptp.extts_channels[i].ena) {
+			extts_cfg.gpio_pin = pf->ptp.extts_channels[i].gpio_pin;
+			extts_cfg.ena = false;
+			ice_ptp_cfg_extts(pf, i, &extts_cfg, false);
+		}
+	}
+
+	synchronize_irq(pf->oicr_irq.virq);
+}
+
+/**
+ * ice_ptp_enable_all_extts - Enable all EXTTS channels
+ * @pf: Board private structure
+ *
+ * Called during reset to restore user configuration.
+ */
+static void ice_ptp_enable_all_extts(struct ice_pf *pf)
+{
+	int i;
+
+	for (i = 0; i < pf->ptp.info.n_ext_ts; i++) {
+		if (pf->ptp.extts_channels[i].ena) {
+			ice_ptp_cfg_extts(pf, i, &pf->ptp.extts_channels[i],
+					  false);
+		}
+	}
 }
 
 /**
@@ -1795,7 +1831,6 @@ ice_ptp_gpio_enable_e810(struct ptp_clock_info *info,
 			 struct ptp_clock_request *rq, int on)
 {
 	struct ice_pf *pf = ptp_info_to_pf(info);
-	struct ice_perout_channel clk_cfg = {0};
 	bool sma_pres = false;
 	unsigned int chan;
 	u32 gpio_pin;
@@ -1806,6 +1841,9 @@ ice_ptp_gpio_enable_e810(struct ptp_clock_info *info,
 
 	switch (rq->type) {
 	case PTP_CLK_REQ_PEROUT:
+	{
+		struct ice_perout_channel clk_cfg = {};
+
 		chan = rq->perout.index;
 		if (sma_pres) {
 			if (chan == ice_pin_desc_e810t[SMA1].chan)
@@ -1833,7 +1871,11 @@ ice_ptp_gpio_enable_e810(struct ptp_clock_info *info,
 
 		err = ice_ptp_cfg_clkout(pf, chan, &clk_cfg, true);
 		break;
+	}
 	case PTP_CLK_REQ_EXTTS:
+	{
+		struct ice_extts_channel extts_cfg = {};
+
 		chan = rq->extts.index;
 		if (sma_pres) {
 			if (chan < ice_pin_desc_e810t[SMA2].chan)
@@ -1849,9 +1891,13 @@ ice_ptp_gpio_enable_e810(struct ptp_clock_info *info,
 			gpio_pin = chan;
 		}
 
-		err = ice_ptp_cfg_extts(pf, !!on, chan, gpio_pin,
-					rq->extts.flags);
-		break;
+		extts_cfg.flags = rq->extts.flags;
+		extts_cfg.gpio_pin = gpio_pin;
+		extts_cfg.ena = !!on;
+
+		ice_ptp_cfg_extts(pf, chan, &extts_cfg, true);
+		return 0;
+	}
 	default:
 		return -EOPNOTSUPP;
 	}
@@ -1869,21 +1915,31 @@ static int ice_ptp_gpio_enable_e823(struct ptp_clock_info *info,
 				    struct ptp_clock_request *rq, int on)
 {
 	struct ice_pf *pf = ptp_info_to_pf(info);
-	struct ice_perout_channel clk_cfg = {0};
 	int err;
 
 	switch (rq->type) {
 	case PTP_CLK_REQ_PPS:
+	{
+		struct ice_perout_channel clk_cfg = {};
+
 		clk_cfg.gpio_pin = PPS_PIN_INDEX;
 		clk_cfg.period = NSEC_PER_SEC;
 		clk_cfg.ena = !!on;
 
 		err = ice_ptp_cfg_clkout(pf, PPS_CLK_GEN_CHAN, &clk_cfg, true);
 		break;
+	}
 	case PTP_CLK_REQ_EXTTS:
-		err = ice_ptp_cfg_extts(pf, !!on, rq->extts.index,
-					TIME_SYNC_PIN_INDEX, rq->extts.flags);
+	{
+		struct ice_extts_channel extts_cfg = {};
+
+		extts_cfg.flags = rq->extts.flags;
+		extts_cfg.gpio_pin = TIME_SYNC_PIN_INDEX;
+		extts_cfg.ena = !!on;
+
+		ice_ptp_cfg_extts(pf, rq->extts.index, &extts_cfg, true);
 		break;
+	}
 	default:
 		return -EOPNOTSUPP;
 	}
@@ -2720,6 +2776,10 @@ static int ice_ptp_rebuild_owner(struct ice_pf *pf)
 		ice_ptp_restart_all_phy(pf);
 	}
 
+	/* Re-enable all periodic outputs and external timestamp events */
+	ice_ptp_enable_all_clkout(pf);
+	ice_ptp_enable_all_extts(pf);
+
 	return 0;
 }
 
@@ -3275,6 +3335,8 @@ void ice_ptp_release(struct ice_pf *pf)
 
 	ice_ptp_release_tx_tracker(pf, &pf->ptp.port.tx);
 
+	ice_ptp_disable_all_extts(pf);
+
 	kthread_cancel_delayed_work_sync(&pf->ptp.work);
 
 	ice_ptp_port_phy_stop(&pf->ptp.port);
diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.h b/drivers/net/ethernet/intel/ice/ice_ptp.h
index 3af20025043a..f1171cdd93c8 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.h
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
@@ -33,6 +33,12 @@ struct ice_perout_channel {
 	u64 start_time;
 };
 
+struct ice_extts_channel {
+	bool ena;
+	u32 gpio_pin;
+	u32 flags;
+};
+
 /* The ice hardware captures Tx hardware timestamps in the PHY. The timestamp
  * is stored in a buffer of registers. Depending on the specific hardware,
  * this buffer might be shared across multiple PHY ports.
@@ -226,6 +232,7 @@ enum ice_ptp_state {
  * @ext_ts_irq: the external timestamp IRQ in use
  * @kworker: kwork thread for handling periodic work
  * @perout_channels: periodic output data
+ * @extts_channels: channels for external timestamps
  * @info: structure defining PTP hardware capabilities
  * @clock: pointer to registered PTP clock device
  * @tstamp_config: hardware timestamping configuration
@@ -249,6 +256,7 @@ struct ice_ptp {
 	u8 ext_ts_irq;
 	struct kthread_worker *kworker;
 	struct ice_perout_channel perout_channels[GLTSYN_TGT_H_IDX_MAX];
+	struct ice_extts_channel extts_channels[GLTSYN_TGT_H_IDX_MAX];
 	struct ptp_clock_info info;
 	struct ptp_clock *clock;
 	struct hwtstamp_config tstamp_config;
-- 
2.43.0

[PATCH iwl-net 2/3] ice: Don't process extts if PTP is disabled

[Karol Kolacinski]

From: Jacob Keller <jacob.e.keller@intel.com>

The ice_ptp_extts_event() function can race with ice_ptp_release() and
result in a NULL pointer dereference which leads to a kernel panic.

Panic occurs because the ice_ptp_extts_event() function calls
ptp_clock_event() with a NULL pointer. The ice driver has already
released the PTP clock by the time the interrupt for the next external
timestamp event occurs.

To fix this, modify the ice_ptp_extts_event() function to check the
PTP state and bail early if PTP is not ready. To ensure that the IRQ
sees the state change, call synchronize_irq() before removing the PTP
clock.

Another potential fix would be to ensure that all the GPIO configuration
gets disabled during release of the driver. This is currently not
trivial as each device family has its own set of configuration which is
not shared across all devices. In addition, only some of the device
families use the pin configuration interface. For now, relying on the
state flag is the simpler solution.

Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_ptp.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index 30f1f910e6d9..b952cad42f92 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -1559,6 +1559,10 @@ void ice_ptp_extts_event(struct ice_pf *pf)
 	u8 chan, tmr_idx;
 	u32 hi, lo;
 
+	/* Don't process timestamp events if PTP is not ready */
+	if (pf->ptp.state != ICE_PTP_READY)
+		return;
+
 	tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
 	/* Event time is captured by one of the two matched registers
 	 *      GLTSYN_EVNT_L: 32 LSB of sampled time event
@@ -1573,10 +1577,8 @@ void ice_ptp_extts_event(struct ice_pf *pf)
 			event.timestamp = (((u64)hi) << 32) | lo;
 			event.type = PTP_CLOCK_EXTTS;
 			event.index = chan;
-
-			/* Fire event */
-			ptp_clock_event(pf->ptp.clock, &event);
 			pf->ptp.ext_ts_irq &= ~(1 << chan);
+			ptp_clock_event(pf->ptp.clock, &event);
 		}
 	}
 }
-- 
2.43.0

[PATCH iwl-net 3/3] ice: Reject pin requests with unsupported flags

[Karol Kolacinski]

From: Jacob Keller <jacob.e.keller@intel.com>

The driver receives requests for configuring pins via the .enable
callback of the PTP clock object. These requests come into the driver
with flags which modify the requested behavior from userspace. Current
implementation in ice does not reject flags that it doesn't support.
This causes the driver to incorrectly apply requests with such flags as
PTP_PEROUT_DUTY_CYCLE, or any future flags added by the kernel which it
is not yet aware of.

Fix this by properly validating flags in both ice_ptp_cfg_perout and
ice_ptp_cfg_extts. Ensure that we check by bit-wise negating supported
flags rather than just checking and rejecting known un-supported flags.
This is preferable, as it ensures better compatibility with future
kernels.

Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_ptp.c | 41 ++++++++++++++----------
 drivers/net/ethernet/intel/ice/ice_ptp.h |  1 +
 2 files changed, 25 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index b952cad42f92..5fa377786f4c 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -1591,14 +1591,23 @@ void ice_ptp_extts_event(struct ice_pf *pf)
  * @store: If set to true, the values will be stored
  *
  * Configure an external timestamp event on the requested channel.
-  */
-static void ice_ptp_cfg_extts(struct ice_pf *pf, unsigned int chan,
-			      struct ice_extts_channel *config, bool store)
+ *
+ * Return: 0 on sucess, -EOPNOTUSPP on unsupported flags
+ */
+static int ice_ptp_cfg_extts(struct ice_pf *pf, unsigned int chan,
+			     struct ice_extts_channel *config, bool store)
 {
 	u32 func, aux_reg, gpio_reg, irq_reg;
 	struct ice_hw *hw = &pf->hw;
 	u8 tmr_idx;
 
+	/* Reject requests with unsupported flags */
+	if (config->flags & ~(PTP_ENABLE_FEATURE |
+			      PTP_RISING_EDGE |
+			      PTP_FALLING_EDGE |
+			      PTP_STRICT_FLAGS))
+	return -EOPNOTSUPP;
+
 	tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
 
 	irq_reg = rd32(hw, PFINT_OICR_ENA);
@@ -1639,6 +1648,8 @@ static void ice_ptp_cfg_extts(struct ice_pf *pf, unsigned int chan,
 
 	if (store)
 		memcpy(&pf->ptp.extts_channels[chan], config, sizeof(*config));
+
+	return 0;
 }
 
 /**
@@ -1697,6 +1708,9 @@ static int ice_ptp_cfg_clkout(struct ice_pf *pf, unsigned int chan,
 	u32 func, val, gpio_pin;
 	u8 tmr_idx;
 
+	if (config->flags & ~PTP_PEROUT_PHASE)
+		return -EOPNOTSUPP;
+
 	tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
 
 	/* 0. Reset mode & out_en in AUX_OUT */
@@ -1836,7 +1850,6 @@ ice_ptp_gpio_enable_e810(struct ptp_clock_info *info,
 	bool sma_pres = false;
 	unsigned int chan;
 	u32 gpio_pin;
-	int err;
 
 	if (ice_is_feature_supported(pf, ICE_F_SMA_CTRL))
 		sma_pres = true;
@@ -1865,14 +1878,14 @@ ice_ptp_gpio_enable_e810(struct ptp_clock_info *info,
 			clk_cfg.gpio_pin = chan;
 		}
 
+		clk_cfg.flags = rq->perout.flags;
 		clk_cfg.period = ((rq->perout.period.sec * NSEC_PER_SEC) +
 				   rq->perout.period.nsec);
 		clk_cfg.start_time = ((rq->perout.start.sec * NSEC_PER_SEC) +
 				       rq->perout.start.nsec);
 		clk_cfg.ena = !!on;
 
-		err = ice_ptp_cfg_clkout(pf, chan, &clk_cfg, true);
-		break;
+		return ice_ptp_cfg_clkout(pf, chan, &clk_cfg, true);
 	}
 	case PTP_CLK_REQ_EXTTS:
 	{
@@ -1897,14 +1910,12 @@ ice_ptp_gpio_enable_e810(struct ptp_clock_info *info,
 		extts_cfg.gpio_pin = gpio_pin;
 		extts_cfg.ena = !!on;
 
-		ice_ptp_cfg_extts(pf, chan, &extts_cfg, true);
-		return 0;
+
+		return ice_ptp_cfg_extts(pf, chan, &extts_cfg, true);
 	}
 	default:
 		return -EOPNOTSUPP;
 	}
-
-	return err;
 }
 
 /**
@@ -1917,19 +1928,18 @@ static int ice_ptp_gpio_enable_e823(struct ptp_clock_info *info,
 				    struct ptp_clock_request *rq, int on)
 {
 	struct ice_pf *pf = ptp_info_to_pf(info);
-	int err;
 
 	switch (rq->type) {
 	case PTP_CLK_REQ_PPS:
 	{
 		struct ice_perout_channel clk_cfg = {};
 
+		clk_cfg.flags = rq->perout.flags;
 		clk_cfg.gpio_pin = PPS_PIN_INDEX;
 		clk_cfg.period = NSEC_PER_SEC;
 		clk_cfg.ena = !!on;
 
-		err = ice_ptp_cfg_clkout(pf, PPS_CLK_GEN_CHAN, &clk_cfg, true);
-		break;
+		return ice_ptp_cfg_clkout(pf, PPS_CLK_GEN_CHAN, &clk_cfg, true);
 	}
 	case PTP_CLK_REQ_EXTTS:
 	{
@@ -1939,14 +1949,11 @@ static int ice_ptp_gpio_enable_e823(struct ptp_clock_info *info,
 		extts_cfg.gpio_pin = TIME_SYNC_PIN_INDEX;
 		extts_cfg.ena = !!on;
 
-		ice_ptp_cfg_extts(pf, rq->extts.index, &extts_cfg, true);
-		break;
+		return ice_ptp_cfg_extts(pf, rq->extts.index, &extts_cfg, true);
 	}
 	default:
 		return -EOPNOTSUPP;
 	}
-
-	return err;
 }
 
 /**
diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.h b/drivers/net/ethernet/intel/ice/ice_ptp.h
index f1171cdd93c8..e2af9749061c 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.h
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
@@ -29,6 +29,7 @@ enum ice_ptp_pin_e810t {
 struct ice_perout_channel {
 	bool ena;
 	u32 gpio_pin;
+	u32 flags;
 	u64 period;
 	u64 start_time;
 };
-- 
2.43.0

Re: [PATCH iwl-net 2/3] ice: Don't process extts if PTP is disabled

[Simon Horman]

On Tue, Jun 18, 2024 at 12:41:37PM +0200, Karol Kolacinski wrote:
> From: Jacob Keller <jacob.e.keller@intel.com>
> 
> The ice_ptp_extts_event() function can race with ice_ptp_release() and
> result in a NULL pointer dereference which leads to a kernel panic.
> 
> Panic occurs because the ice_ptp_extts_event() function calls
> ptp_clock_event() with a NULL pointer. The ice driver has already
> released the PTP clock by the time the interrupt for the next external
> timestamp event occurs.
> 
> To fix this, modify the ice_ptp_extts_event() function to check the
> PTP state and bail early if PTP is not ready. To ensure that the IRQ
> sees the state change, call synchronize_irq() before removing the PTP
> clock.

Hi Karol and Jacob,

After pf->ptp.state is set in ptp_clock_event(),
ice_ptp_disable_all_extts() is called which in turn calls
synchronize_irq(). Which I assume is what the last sentence above refers
to. But the way it is worded it sounds like a call to synchronize_irq() is
being added by this patch, which is not the case.

I suppose it is not a big deal, but this did confuse me.
So perhaps the wording could be enhanced?

> Another potential fix would be to ensure that all the GPIO configuration
> gets disabled during release of the driver. This is currently not
> trivial as each device family has its own set of configuration which is
> not shared across all devices. In addition, only some of the device
> families use the pin configuration interface. For now, relying on the
> state flag is the simpler solution.
> 
> Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
> Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_ptp.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
> index 30f1f910e6d9..b952cad42f92 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ptp.c
> +++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
> @@ -1559,6 +1559,10 @@ void ice_ptp_extts_event(struct ice_pf *pf)
>  	u8 chan, tmr_idx;
>  	u32 hi, lo;
>  
> +	/* Don't process timestamp events if PTP is not ready */
> +	if (pf->ptp.state != ICE_PTP_READY)
> +		return;
> +
>  	tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
>  	/* Event time is captured by one of the two matched registers
>  	 *      GLTSYN_EVNT_L: 32 LSB of sampled time event
> @@ -1573,10 +1577,8 @@ void ice_ptp_extts_event(struct ice_pf *pf)
>  			event.timestamp = (((u64)hi) << 32) | lo;
>  			event.type = PTP_CLOCK_EXTTS;
>  			event.index = chan;
> -
> -			/* Fire event */
> -			ptp_clock_event(pf->ptp.clock, &event);
>  			pf->ptp.ext_ts_irq &= ~(1 << chan);
> +			ptp_clock_event(pf->ptp.clock, &event);
>  		}
>  	}
>  }

I'm also confused (often, TBH!) as to how the last hunk of this
patch relates to the problem at hand.

Re: [PATCH iwl-net 1/3] ice: Fix improper extts handling

[Simon Horman]

On Tue, Jun 18, 2024 at 12:41:36PM +0200, Karol Kolacinski wrote:
> From: Milena Olech <milena.olech@intel.com>
> 
> Extts events are disabled and enabled by the application ts2phc.
> However, in case where the driver is removed when the application is
> running, channel remains enabled. As a result, in the next run of the
> app, two channels are enabled and the information "extts on unexpected
> channel" is printed to the user.
> 
> To avoid that, extts events shall be disabled when PTP is released.
> 
> Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
> Co-developed-by: Jacob Keller <jacob.e.keller@intel.com>
> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
> Signed-off-by: Milena Olech <milena.olech@intel.com>
> Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>

Hi Milena and Karol,

Some feedback from my side.

...

> diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
> index 0f17fc1181d2..30f1f910e6d9 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ptp.c
> +++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
> @@ -1584,27 +1584,24 @@ void ice_ptp_extts_event(struct ice_pf *pf)
>  /**
>   * ice_ptp_cfg_extts - Configure EXTTS pin and channel
>   * @pf: Board private structure
> - * @ena: true to enable; false to disable
>   * @chan: GPIO channel (0-3)
> - * @gpio_pin: GPIO pin
> - * @extts_flags: request flags from the ptp_extts_request.flags
> - */
> -static int
> -ice_ptp_cfg_extts(struct ice_pf *pf, bool ena, unsigned int chan, u32 gpio_pin,
> -		  unsigned int extts_flags)
> + * @config: desired EXTTS configuration.
> + * @store: If set to true, the values will be stored
> + *
> + * Configure an external timestamp event on the requested channel.
> +  */

nit: There is an extra leading space on the line above.

     Also, although not strictly related to this change,
     please consider adding a Returns: section to this kernel doc.

> +static void ice_ptp_cfg_extts(struct ice_pf *pf, unsigned int chan,
> +			      struct ice_extts_channel *config, bool store)

...

> @@ -1869,21 +1915,31 @@ static int ice_ptp_gpio_enable_e823(struct ptp_clock_info *info,
>  				    struct ptp_clock_request *rq, int on)
>  {
>  	struct ice_pf *pf = ptp_info_to_pf(info);
> -	struct ice_perout_channel clk_cfg = {0};
>  	int err;
>  
>  	switch (rq->type) {
>  	case PTP_CLK_REQ_PPS:
> +	{
> +		struct ice_perout_channel clk_cfg = {};
> +
>  		clk_cfg.gpio_pin = PPS_PIN_INDEX;
>  		clk_cfg.period = NSEC_PER_SEC;
>  		clk_cfg.ena = !!on;
>  
>  		err = ice_ptp_cfg_clkout(pf, PPS_CLK_GEN_CHAN, &clk_cfg, true);
>  		break;
> +	}
>  	case PTP_CLK_REQ_EXTTS:
> -		err = ice_ptp_cfg_extts(pf, !!on, rq->extts.index,
> -					TIME_SYNC_PIN_INDEX, rq->extts.flags);
> +	{
> +		struct ice_extts_channel extts_cfg = {};
> +
> +		extts_cfg.flags = rq->extts.flags;
> +		extts_cfg.gpio_pin = TIME_SYNC_PIN_INDEX;
> +		extts_cfg.ena = !!on;
> +
> +		ice_ptp_cfg_extts(pf, rq->extts.index, &extts_cfg, true);
>  		break;

This function returns err.
But with this patch err is uninitialised here.

Perhaps err be set to the return value of ice_ptp_cfg_extts()
as it was before this patch?

Flagged by allmodconfig W=1 builds with gcc-13 and clang-18, and Smatch.

> +	}
>  	default:
>  		return -EOPNOTSUPP;
>  	}

...

Re: [PATCH iwl-net 3/3] ice: Reject pin requests with unsupported flags

[Simon Horman]

On Tue, Jun 18, 2024 at 12:41:38PM +0200, Karol Kolacinski wrote:
> From: Jacob Keller <jacob.e.keller@intel.com>
> 
> The driver receives requests for configuring pins via the .enable
> callback of the PTP clock object. These requests come into the driver
> with flags which modify the requested behavior from userspace. Current
> implementation in ice does not reject flags that it doesn't support.
> This causes the driver to incorrectly apply requests with such flags as
> PTP_PEROUT_DUTY_CYCLE, or any future flags added by the kernel which it
> is not yet aware of.
> 
> Fix this by properly validating flags in both ice_ptp_cfg_perout and
> ice_ptp_cfg_extts. Ensure that we check by bit-wise negating supported
> flags rather than just checking and rejecting known un-supported flags.
> This is preferable, as it ensures better compatibility with future
> kernels.
> 
> Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
> Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>

Hi Jacob and Karol,

Some minor feedback from my side.

...

> diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
> index b952cad42f92..5fa377786f4c 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ptp.c
> +++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
> @@ -1591,14 +1591,23 @@ void ice_ptp_extts_event(struct ice_pf *pf)
>   * @store: If set to true, the values will be stored
>   *
>   * Configure an external timestamp event on the requested channel.
> -  */
> -static void ice_ptp_cfg_extts(struct ice_pf *pf, unsigned int chan,
> -			      struct ice_extts_channel *config, bool store)
> + *
> + * Return: 0 on sucess, -EOPNOTUSPP on unsupported flags

nit: success

     Flagged by checkpatch.pl --codespell

> + */
> +static int ice_ptp_cfg_extts(struct ice_pf *pf, unsigned int chan,
> +			     struct ice_extts_channel *config, bool store)
>  {
>  	u32 func, aux_reg, gpio_reg, irq_reg;
>  	struct ice_hw *hw = &pf->hw;
>  	u8 tmr_idx;
>  
> +	/* Reject requests with unsupported flags */
> +	if (config->flags & ~(PTP_ENABLE_FEATURE |
> +			      PTP_RISING_EDGE |
> +			      PTP_FALLING_EDGE |
> +			      PTP_STRICT_FLAGS))
> +	return -EOPNOTSUPP;

The line above should to be indented one more tab.
Clearly this makes no difference at run-time,
but it takes a while (for me) to parse things as-is.

...

> @@ -1697,6 +1708,9 @@ static int ice_ptp_cfg_clkout(struct ice_pf *pf, unsigned int chan,
>  	u32 func, val, gpio_pin;
>  	u8 tmr_idx;
>  
> +	if (config->flags & ~PTP_PEROUT_PHASE)
> +		return -EOPNOTSUPP;

A little further down in this function it is assumed that config may
be NULL. So I think the code above needs to be updated to take that
into account too.

Flagged by Smatch.

...

RE: [PATCH iwl-net 2/3] ice: Don't process extts if PTP is disabled

[Keller, Jacob E]

> -----Original Message-----
> From: Simon Horman <horms@kernel.org>
> Sent: Wednesday, June 19, 2024 9:41 AM
> To: Kolacinski, Karol <karol.kolacinski@intel.com>
> Cc: intel-wired-lan@lists.osuosl.org; netdev@vger.kernel.org; Nguyen, Anthony L
> <anthony.l.nguyen@intel.com>; Kitszel, Przemyslaw
> <przemyslaw.kitszel@intel.com>; Keller, Jacob E <jacob.e.keller@intel.com>
> Subject: Re: [PATCH iwl-net 2/3] ice: Don't process extts if PTP is disabled
> 
> On Tue, Jun 18, 2024 at 12:41:37PM +0200, Karol Kolacinski wrote:
> > From: Jacob Keller <jacob.e.keller@intel.com>
> >
> > The ice_ptp_extts_event() function can race with ice_ptp_release() and
> > result in a NULL pointer dereference which leads to a kernel panic.
> >
> > Panic occurs because the ice_ptp_extts_event() function calls
> > ptp_clock_event() with a NULL pointer. The ice driver has already
> > released the PTP clock by the time the interrupt for the next external
> > timestamp event occurs.
> >
> > To fix this, modify the ice_ptp_extts_event() function to check the
> > PTP state and bail early if PTP is not ready. To ensure that the IRQ
> > sees the state change, call synchronize_irq() before removing the PTP
> > clock.
> 
> Hi Karol and Jacob,
> 
> After pf->ptp.state is set in ptp_clock_event(),
> ice_ptp_disable_all_extts() is called which in turn calls
> synchronize_irq(). Which I assume is what the last sentence above refers
> to. But the way it is worded it sounds like a call to synchronize_irq() is
> being added by this patch, which is not the case.
> 
> I suppose it is not a big deal, but this did confuse me.
> So perhaps the wording could be enhanced?
> 

I believe the call to synchronize_irq() predates this as the same IRQ is used for other timestamping/PTP related events.

This could be clarified in the commit message

> > Another potential fix would be to ensure that all the GPIO configuration
> > gets disabled during release of the driver. This is currently not
> > trivial as each device family has its own set of configuration which is
> > not shared across all devices. In addition, only some of the device
> > families use the pin configuration interface. For now, relying on the
> > state flag is the simpler solution.
> >
> > Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
> > Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
> > Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
> > Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
> > ---
> >  drivers/net/ethernet/intel/ice/ice_ptp.c | 8 +++++---
> >  1 file changed, 5 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c
> b/drivers/net/ethernet/intel/ice/ice_ptp.c
> > index 30f1f910e6d9..b952cad42f92 100644
> > --- a/drivers/net/ethernet/intel/ice/ice_ptp.c
> > +++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
> > @@ -1559,6 +1559,10 @@ void ice_ptp_extts_event(struct ice_pf *pf)
> >  	u8 chan, tmr_idx;
> >  	u32 hi, lo;
> >
> > +	/* Don't process timestamp events if PTP is not ready */
> > +	if (pf->ptp.state != ICE_PTP_READY)
> > +		return;
> > +
> >  	tmr_idx = hw->func_caps.ts_func_info.tmr_index_owned;
> >  	/* Event time is captured by one of the two matched registers
> >  	 *      GLTSYN_EVNT_L: 32 LSB of sampled time event
> > @@ -1573,10 +1577,8 @@ void ice_ptp_extts_event(struct ice_pf *pf)
> >  			event.timestamp = (((u64)hi) << 32) | lo;
> >  			event.type = PTP_CLOCK_EXTTS;
> >  			event.index = chan;
> > -
> > -			/* Fire event */
> > -			ptp_clock_event(pf->ptp.clock, &event);
> >  			pf->ptp.ext_ts_irq &= ~(1 << chan);
> > +			ptp_clock_event(pf->ptp.clock, &event);
> >  		}
> >  	}
> >  }
> 
> I'm also confused (often, TBH!) as to how the last hunk of this
> patch relates to the problem at hand.