linux-kernel - [tip: irq/core] irqchip/armada-370-xp: Do not touch IPI registers on platforms without IPI

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Message-ID: <171915662859.10875.17816084553826058337.tip-bot2@tip-bot2>
Date: Sun, 23 Jun 2024 15:30:28 -0000
From: tip-bot2 for Pali Rohár <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: pali@...nel.org, kabel@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
 Andrew Lunn <andrew@...n.ch>, x86@...nel.org, linux-kernel@...r.kernel.org,
 maz@...nel.org
Subject: [tip: irq/core] irqchip/armada-370-xp: Do not touch IPI registers on
 platforms without IPI

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     9d80f6bd3ad8f2b49651d4685bb391399ecf80a2
Gitweb:        https://git.kernel.org/tip/9d80f6bd3ad8f2b49651d4685bb391399ecf80a2
Author:        Pali Rohár <pali@...nel.org>
AuthorDate:    Fri, 21 Jun 2024 11:38:30 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Sun, 23 Jun 2024 17:23:08 +02:00

irqchip/armada-370-xp: Do not touch IPI registers on platforms without IPI

On platforms where IPI is not available in the MPIC, the IPI registers
instead represent an additional set of MSI interrupt registers (currently
unused by the driver).

Do not touch these registers on platforms where IPI is not available in the
MPIC.

[ Marek: refactored, changed commit message ]

Signed-off-by: Pali Rohár <pali@...nel.org>
Signed-off-by: Marek Behún <kabel@...nel.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Andrew Lunn <andrew@...n.ch>

---
 drivers/irqchip/irq-armada-370-xp.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c
index deb4c9b..94a81c5 100644
--- a/drivers/irqchip/irq-armada-370-xp.c
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -502,6 +502,9 @@ static void armada_xp_mpic_smp_cpu_init(void)
 	for (i = 0; i < nr_irqs; i++)
 		writel(i, per_cpu_int_base + ARMADA_370_XP_INT_SET_MASK_OFFS);
 
+	if (!is_ipi_available())
+		return;
+
 	/* Disable all IPIs */
 	writel(0, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
 
@@ -752,7 +755,7 @@ static void armada_370_xp_mpic_resume(void)
 	/* Reconfigure doorbells for IPIs and MSIs */
 	writel(doorbell_mask_reg,
 	       per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
-	if (doorbell_mask_reg & IPI_DOORBELL_MASK)
+	if (is_ipi_available() && (doorbell_mask_reg & IPI_DOORBELL_MASK))
 		writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
 	if (doorbell_mask_reg & PCI_MSI_DOORBELL_MASK)
 		writel(1, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
@@ -803,13 +806,18 @@ static int __init armada_370_xp_mpic_of_init(struct device_node *node,
 	BUG_ON(!armada_370_xp_mpic_domain);
 	irq_domain_update_bus_token(armada_370_xp_mpic_domain, DOMAIN_BUS_WIRED);
 
+	/*
+	 * Initialize parent_irq before calling any other functions, since it is
+	 * used to distinguish between IPI and non-IPI platforms.
+	 */
+	parent_irq = irq_of_parse_and_map(node, 0);
+
 	/* Setup for the boot CPU */
 	armada_xp_mpic_perf_init();
 	armada_xp_mpic_smp_cpu_init();
 
 	armada_370_xp_msi_init(node, main_int_res.start);
 
-	parent_irq = irq_of_parse_and_map(node, 0);
 	if (parent_irq <= 0) {
 		irq_set_default_host(armada_370_xp_mpic_domain);
 		set_handle_irq(armada_370_xp_handle_irq);