diff options
Diffstat (limited to 'target/linux/generic/pending-4.19/103-MIPS-perf-ath79-Fix-perfcount-IRQ-assignment.patch')
| -rw-r--r-- | target/linux/generic/pending-4.19/103-MIPS-perf-ath79-Fix-perfcount-IRQ-assignment.patch | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.19/103-MIPS-perf-ath79-Fix-perfcount-IRQ-assignment.patch b/target/linux/generic/pending-4.19/103-MIPS-perf-ath79-Fix-perfcount-IRQ-assignment.patch new file mode 100644 index 0000000000..6b74c7da1d --- /dev/null +++ b/target/linux/generic/pending-4.19/103-MIPS-perf-ath79-Fix-perfcount-IRQ-assignment.patch @@ -0,0 +1,110 @@ +From 852a88f35f4b7e5ebb717fed3c3a3330d5ad4336 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Petr=20=C5=A0tetiar?= <ynezz@true.cz> +Date: Wed, 10 Apr 2019 16:43:27 +0200 +Subject: [PATCH v2] MIPS: perf: ath79: Fix perfcount IRQ assignment +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +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> +--- + +Changes since v1: + + I've incorporated two comments which I've received on IRC from blogic and + I've also reworded the commit message to match the changes in v2 of this + patch. + + * use actual hardware perfcount IRQ 5 instead of the virtual IRQ 13 + * dropped the CONFIG_PERF_EVENTS ifdef around irq_create_mapping + + arch/mips/ath79/setup.c | 6 ------ + drivers/irqchip/irq-ath79-misc.c | 11 +++++++++++ + 2 files changed, 11 insertions(+), 6 deletions(-) + +--- 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; +--- 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_domai + { + 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); |