[PATCH AUTOSEL 4.19 47/81] MIPS: perf: ath79: Fix perfcount IRQ assignment

Sasha Levin
2019-05-07T05:37:37Z

From: Petr Štetiar <ynezz@true.cz>

[ Upstream commit a1e8783db8e0d58891681bc1e6d9ada66eae8e20 ]

Currently it's not possible to use perf on ath79 due to genirq flags
mismatch happening on static virtual IRQ 13 which is used for
performance counters hardware IRQ 5.

On TP-Link Archer C7v5:

CPU0
2: 0 MIPS 2 ath9k
4: 318 MIPS 4 19000000.eth
7: 55034 MIPS 7 timer
8: 1236 MISC 3 ttyS0
12: 0 INTC 1 ehci_hcd:usb1
13: 0 gpio-ath79 2 keys
14: 0 gpio-ath79 5 keys
15: 31 AR724X PCI 1 ath10k_pci

$ perf top
genirq: Flags mismatch irq 13. 00014c83 (mips_perf_pmu) vs. 00002003 (keys)

On TP-Link Archer C7v4:

CPU0
4: 0 MIPS 4 19000000.eth
5: 7135 MIPS 5 1a000000.eth
7: 98379 MIPS 7 timer
8: 30 MISC 3 ttyS0
12: 90028 INTC 0 ath9k
13: 5520 INTC 1 ehci_hcd:usb1
14: 4623 INTC 2 ehci_hcd:usb2
15: 32844 AR724X PCI 1 ath10k_pci
16: 0 gpio-ath79 16 keys
23: 0 gpio-ath79 23 keys

$ perf top
genirq: Flags mismatch irq 13. 00014c80 (mips_perf_pmu) vs. 00000080 (ehci_hcd:usb1)

This problem is happening, because currently statically assigned virtual
IRQ 13 for performance counters is not claimed during the initialization
of MIPS PMU during the bootup, so the IRQ subsystem doesn't know, that
this interrupt isn't available for further use.

So this patch fixes the issue by simply booking hardware IRQ 5 for MIPS PMU.

Tested-by: Kevin 'ldir' Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Signed-off-by: Petr Štetiar <ynezz@true.cz>
Acked-by: John Crispin <john@phrozen.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/mips/ath79/setup.c | 6 ------
drivers/irqchip/irq-ath79-misc.c | 11 +++++++++++
2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/arch/mips/ath79/setup.c b/arch/mips/ath79/setup.c
index 4c7a93f4039a..7c0b2e6cdfbd 100644
--- a/arch/mips/ath79/setup.c
+++ b/arch/mips/ath79/setup.c
@@ -211,12 +211,6 @@ const char *get_system_type(void)
return ath79_sys_type;
}

-int get_c0_perfcount_int(void)
-{
- return ATH79_MISC_IRQ(5);
-}
-EXPORT_SYMBOL_GPL(get_c0_perfcount_int);
-
unsigned int get_c0_compare_int(void)
{
return CP0_LEGACY_COMPARE_IRQ;
diff --git a/drivers/irqchip/irq-ath79-misc.c b/drivers/irqchip/irq-ath79-misc.c
index aa7290784636..0390603170b4 100644
--- a/drivers/irqchip/irq-ath79-misc.c
+++ b/drivers/irqchip/irq-ath79-misc.c
@@ -22,6 +22,15 @@
#define AR71XX_RESET_REG_MISC_INT_ENABLE 4

#define ATH79_MISC_IRQ_COUNT 32
+#define ATH79_MISC_PERF_IRQ 5
+
+static int ath79_perfcount_irq;
+
+int get_c0_perfcount_int(void)
+{
+ return ath79_perfcount_irq;
+}
+EXPORT_SYMBOL_GPL(get_c0_perfcount_int);

static void ath79_misc_irq_handler(struct irq_desc *desc)
{
@@ -113,6 +122,8 @@ static void __init ath79_misc_intc_domain_init(
{
void __iomem *base = domain->host_data;

+ ath79_perfcount_irq = irq_create_mapping(domain, ATH79_MISC_PERF_IRQ);
+
/* Disable and clear all interrupts */
__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE);
__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS);
--
2.20.1