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authorPetr Štetiar <ynezz@true.cz>2019-04-13 00:08:32 +0300
committerPaul Burton <paul.burton@mips.com>2019-04-17 01:09:10 +0300
commita1e8783db8e0d58891681bc1e6d9ada66eae8e20 (patch)
treed7ac31285f365fc0d5113909c0f12a16785fcf0c /arch/mips/ath79
parent79b4a9cf0e2ea8203ce777c8d5cfa86c71eae86e (diff)
downloadlinux-a1e8783db8e0d58891681bc1e6d9ada66eae8e20.tar.xz
MIPS: perf: ath79: Fix perfcount IRQ assignment
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>
Diffstat (limited to 'arch/mips/ath79')
-rw-r--r--arch/mips/ath79/setup.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/arch/mips/ath79/setup.c b/arch/mips/ath79/setup.c
index 4a70c5de8c92..25a57895a3a3 100644
--- a/arch/mips/ath79/setup.c
+++ b/arch/mips/ath79/setup.c
@@ -210,12 +210,6 @@ 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;