target/linux/bmips/patches-5.15/202-mips-bmips-BCM6358-disable-ARCH_HAS_SYNC_DMA_FOR_CPU_ALL.patch

   1 From f48c93e4c4b5dbad1c0fbd623fd68f55f1667527 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
   3 Date: Fri, 10 Mar 2023 13:05:10 +0100
   4 Subject: [PATCH] mips: bmips: BCM6358: disable arch_sync_dma_for_cpu_all() for
   5  TP1
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 arch_sync_dma_for_cpu_all() causes kernel panics on BCM6358 with EHCI/OHCI:
  11 [    3.881739] usb 1-1: new high-speed USB device number 2 using ehci-platform
  12 [    3.895011] Reserved instruction in kernel code[#1]:
  13 [    3.900113] CPU: 0 PID: 1 Comm: init Not tainted 5.10.16 #0
  14 [    3.905829] $ 0   : 00000000 10008700 00000000 77d94060
  15 [    3.911238] $ 4   : 7fd1f088 00000000 81431cac 81431ca0
  16 [    3.916641] $ 8   : 00000000 ffffefff 8075cd34 00000000
  17 [    3.922043] $12   : 806f8d40 f3e812b7 00000000 000d9aaa
  18 [    3.927446] $16   : 7fd1f068 7fd1f080 7ff559b8 81428470
  19 [    3.932848] $20   : 00000000 00000000 55590000 77d70000
  20 [    3.938251] $24   : 00000018 00000010
  21 [    3.943655] $28   : 81430000 81431e60 81431f28 800157fc
  22 [    3.949058] Hi    : 00000000
  23 [    3.952013] Lo    : 00000000
  24 [    3.955019] epc   : 80015808 setup_sigcontext+0x54/0x24c
  25 [    3.960464] ra    : 800157fc setup_sigcontext+0x48/0x24c
  26 [    3.965913] Status: 10008703 KERNEL EXL IE
  27 [    3.970216] Cause : 00800028 (ExcCode 0a)
  28 [    3.974340] PrId  : 0002a010 (Broadcom BMIPS4350)
  29 [    3.979170] Modules linked in: ohci_platform ohci_hcd fsl_mph_dr_of ehci_platform ehci_fsl ehci_hcd gpio_button_hotplug usbcore nls_base usb_common
  30 [    3.992907] Process init (pid: 1, threadinfo=(ptrval), task=(ptrval), tls=77e22ec8)
  31 [    4.000776] Stack : 81431ef4 7fd1f080 81431f28 81428470 7fd1f068 81431edc 7ff559b8 81428470
  32 [    4.009467]         81431f28 7fd1f080 55590000 77d70000 77d5498c 80015c70 806f0000 8063ae74
  33 [    4.018149]         08100002 81431f28 0000000a 08100002 81431f28 0000000a 77d6b418 00000003
  34 [    4.026831]         ffffffff 80016414 80080734 81431ecc 81431ecc 00000001 00000000 04000000
  35 [    4.035512]         77d54874 00000000 00000000 00000000 00000000 00000012 00000002 00000000
  36 [    4.044196]         ...
  37 [    4.046706] Call Trace:
  38 [    4.049238] [<80015808>] setup_sigcontext+0x54/0x24c
  39 [    4.054356] [<80015c70>] setup_frame+0xdc/0x124
  40 [    4.059015] [<80016414>] do_notify_resume+0x1dc/0x288
  41 [    4.064207] [<80011b50>] work_notifysig+0x10/0x18
  42 [    4.069036]
  43 [    4.070538] Code: 8fc300b4  00001025  26240008 <ac820000> ac830004  3c048063  0c0228aa  24846a00  26240010
  44 [    4.080686]
  45 [    4.082517] ---[ end trace 22a8edb41f5f983b ]---
  46 [    4.087374] Kernel panic - not syncing: Fatal exception
  47 [    4.092753] Rebooting in 1 seconds..
  48
  49 This only happens when booting from TP1 instead of TP0.
  50
  51 Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
  52 ---
  53  arch/mips/bmips/dma.c   | 5 +++++
  54  arch/mips/bmips/setup.c | 9 +++++++++
  55  2 files changed, 14 insertions(+)
  56
  57 --- a/arch/mips/bmips/dma.c
  58 +++ b/arch/mips/bmips/dma.c
  59 @@ -64,11 +64,16 @@ phys_addr_t dma_to_phys(struct device *d
  60         return dma_addr;
  61  }
  62
  63 +int bmips_dma_sync_disable = 0;
  64 +
  65  void arch_sync_dma_for_cpu_all(void)
  66  {
  67         void __iomem *cbr = BMIPS_GET_CBR();
  68         u32 cfg;
  69
  70 +       if (bmips_dma_sync_disable)
  71 +               return;
  72 +
  73         if (boot_cpu_type() != CPU_BMIPS3300 &&
  74             boot_cpu_type() != CPU_BMIPS4350 &&
  75             boot_cpu_type() != CPU_BMIPS4380)
  76 --- a/arch/mips/bmips/setup.c
  77 +++ b/arch/mips/bmips/setup.c
  78 @@ -89,6 +89,8 @@
  79
  80  #define DDR_CSEND_REG          0x8
  81
  82 +extern int bmips_dma_sync_disable;
  83 +
  84  static const unsigned long kbase = VMLINUX_LOAD_ADDRESS & 0xfff00000;
  85
  86  struct bmips_cpufreq {
  87 @@ -168,6 +170,13 @@ static void bcm6358_quirks(void)
  88          * disable SMP for now
  89          */
  90         bmips_smp_enabled = 0;
  91 +
  92 +       /*
  93 +        * ARCH_HAS_SYNC_DMA_FOR_CPU_ALL causes kernel panics on BCM6358 when
  94 +        * booting from TP1
  95 +        */
  96 +       if (read_c0_brcm_cmt_local() & (1 << 31))
  97 +               bmips_dma_sync_disable = 1;
  98  }
  99
 100  static void bcm6368_quirks(void)