utils/irqbalance/patches/001-upstream-fix-aarch64-irq-parsing.patch

   1 From bbcd9a42c3cec0935b960b7f2046f1fdfab4f7ef Mon Sep 17 00:00:00 2001
   2 From: Vignesh Raghavendra <vigneshr@ti.com>
   3 Date: Wed, 7 Dec 2022 19:46:19 +0530
   4 Subject: [PATCH] procinterrupts: Fix IRQ name parsing on certain arm64 SoC
   5
   6 On arm64 SoCs like TI's K3 SoC and few other SoCs, IRQ names don't get
   7 parsed correct due to which they end up being classified into wrong
   8 class. Fix this by considering last token to contain IRQ name always.
   9
  10 Eg.: /proc/interrupt
  11
  12 cat /proc/interrupts
  13            CPU0       CPU1       CPU2       CPU3
  14  11:       7155       8882       7235       7791     GICv3  30 Level     arch_timer
  15  14:          0          0          0          0     GICv3  23 Level     arm-pmu
  16  15:          0          0          0          0     GICv3 208 Level     4b00000.spi
  17  16:          0          0          0          0     GICv3 209 Level     4b10000.spi
  18 116:          0          0          0          0  MSI-INTA 1716234 Level     485c0100.dma-controller chan6
  19 134:        166          0          0          0  MSI-INTA 1970707 Level     8000000.ethernet-tx0
  20 224:        149          0          0          0  MSI-INTA 1971731 Level     8000000.ethernet
  21
  22 W/o patch irqbalance -d
  23 IRQ (11) guessed as class 0
  24 IRQ (14) guessed as class 0
  25 IRQ (15) guessed as class 0
  26 IRQ (16) guessed as class 0
  27 IRQ 485c0100.dma-controller chan6(116) guessed as class 0
  28 IRQ (134) guessed as class 0
  29 IRQ (224) guessed as class 0
  30
  31 W/ this patch
  32 IRQ arch_timer(11) guessed as class 0
  33 IRQ arm-pmu(14) guessed as class 0
  34 IRQ 4b00000.spi(15) guessed as class 0
  35 IRQ 4b10000.spi(16) guessed as class 0
  36 IRQ 485c0100.dma-controller chan6(116) guessed as class 0
  37 IRQ 8000000.ethernet-tx0(134) guessed as class 5
  38 IRQ 8000000.ethernet(224) guessed as class 5
  39 IRQ 8000000.ethernet(257) guessed as class 5
  40 IRQ -davinci_gpio  wl18xx(362) guessed as class
  41
  42 Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
  43 ---
  44  procinterrupts.c | 12 +++++++-----
  45  1 file changed, 7 insertions(+), 5 deletions(-)
  46
  47 --- a/procinterrupts.c
  48 +++ b/procinterrupts.c
  49 @@ -178,12 +178,14 @@ void init_irq_class_and_type(char *saved
  50         }
  51
  52  #ifdef AARCH64
  53 -       if (savedptr && strlen(savedptr) > 0) {
  54 +       if (savedptr && strlen(savedptr) > 0)
  55                 snprintf(irq_fullname, PATH_MAX, "%s %s", last_token, savedptr);
  56 -               tmp = strchr(irq_fullname, '\n');
  57 -               if (tmp)
  58 -                       *tmp = 0;
  59 -       }
  60 +       else
  61 +               snprintf(irq_fullname, PATH_MAX, "%s", last_token);
  62 +
  63 +       tmp = strchr(irq_fullname, '\n');
  64 +       if (tmp)
  65 +               *tmp = 0;
  66  #else
  67         snprintf(irq_fullname, PATH_MAX, "%s", last_token);
  68  #endif