diff mbox series

[1/4] soc: qcom: smp2p: Introduce pending state for virtual irq

Message ID 1657087331-32455-2-git-send-email-quic_clew@quicinc.com
State New
Headers show
Series Add smp2p retrigger support | expand

Commit Message

Chris Lew July 6, 2022, 6:02 a.m. UTC 
If a smp2p change occurs while a virtual interrupt is disabled, smp2p
should be able to resend that interrupt on enablement.

This functionality requires the CONFIG_HARDIRQS_SW_RESEND to be enabled
to reschedule the interrupts. To ensure the mask and unmask functions
are called during enabled and disable, set the flag to disable lazy
IRQ state handling (IRQ_DISABLE_UNLAZY).

Signed-off-by: Chris Lew <quic_clew@quicinc.com>
---
 drivers/soc/qcom/smp2p.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

Comments

Doug Anderson July 13, 2022, 3:32 p.m. UTC | #1 
Hi,

I'm jumping in half-blind here since I've never looked at this driver
before, so if I say something that sounds wrong then it probably is.
;-P At the very least I'm super thankful for the "summary" kernel doc
at the start of this file (thanks Bjorn!)...

On Tue, Jul 5, 2022 at 11:03 PM Chris Lew <quic_clew@quicinc.com> wrote:
>
> If a smp2p change occurs while a virtual interrupt is disabled, smp2p
> should be able to resend that interrupt on enablement.

That sounds right. I made some attempt to document how I thought this
worked in commit cf9d052aa600 ("pinctrl: qcom: Don't clear pending
interrupts when enabling").


> This functionality requires the CONFIG_HARDIRQS_SW_RESEND to be enabled
> to reschedule the interrupts.

Maybe mention that you don't need to select this yourself because it's
already selected by the arm64 config?


> To ensure the mask and unmask functions
> are called during enabled and disable, set the flag to disable lazy
> IRQ state handling (IRQ_DISABLE_UNLAZY).
diff mbox series

Patch

diff --git a/drivers/soc/qcom/smp2p.c b/drivers/soc/qcom/smp2p.c
index 59dbf4b61e6c..1c3259fe98be 100644
--- a/drivers/soc/qcom/smp2p.c
+++ b/drivers/soc/qcom/smp2p.c
@@ -101,6 +101,7 @@  struct smp2p_entry {
 
 	struct irq_domain *domain;
 	DECLARE_BITMAP(irq_enabled, 32);
+	DECLARE_BITMAP(irq_pending, 32);
 	DECLARE_BITMAP(irq_rising, 32);
 	DECLARE_BITMAP(irq_falling, 32);
 
@@ -146,6 +147,7 @@  struct qcom_smp2p {
 	unsigned local_pid;
 	unsigned remote_pid;
 
+	int irq;
 	struct regmap *ipc_regmap;
 	int ipc_offset;
 	int ipc_bit;
@@ -217,8 +219,8 @@  static void qcom_smp2p_notify_in(struct qcom_smp2p *smp2p)
 {
 	struct smp2p_smem_item *in;
 	struct smp2p_entry *entry;
+	unsigned long status;
 	int irq_pin;
-	u32 status;
 	char buf[SMP2P_MAX_ENTRY_NAME];
 	u32 val;
 	int i;
@@ -247,19 +249,22 @@  static void qcom_smp2p_notify_in(struct qcom_smp2p *smp2p)
 
 		status = val ^ entry->last_value;
 		entry->last_value = val;
+		status |= *entry->irq_pending;
 
 		/* No changes of this entry? */
 		if (!status)
 			continue;
 
-		for_each_set_bit(i, entry->irq_enabled, 32) {
-			if (!(status & BIT(i)))
-				continue;
-
+		for_each_set_bit(i, &status, 32) {
 			if ((val & BIT(i) && test_bit(i, entry->irq_rising)) ||
 			    (!(val & BIT(i)) && test_bit(i, entry->irq_falling))) {
 				irq_pin = irq_find_mapping(entry->domain, i);
 				handle_nested_irq(irq_pin);
+
+				if (test_bit(i, entry->irq_enabled))
+					clear_bit(i, entry->irq_pending);
+				else
+					set_bit(i, entry->irq_pending);
 			}
 		}
 	}
@@ -365,6 +370,8 @@  static int smp2p_irq_map(struct irq_domain *d,
 	irq_set_chip_data(irq, entry);
 	irq_set_nested_thread(irq, 1);
 	irq_set_noprobe(irq);
+	irq_set_parent(irq, entry->smp2p->irq);
+	irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY);
 
 	return 0;
 }
@@ -609,6 +616,7 @@  static int qcom_smp2p_probe(struct platform_device *pdev)
 	/* Kick the outgoing edge after allocating entries */
 	qcom_smp2p_kick(smp2p);
 
+	smp2p->irq = irq;
 	ret = devm_request_threaded_irq(&pdev->dev, irq,
 					NULL, qcom_smp2p_intr,
 					IRQF_ONESHOT,