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

   1 From 84c06b4a1dfa3e021fdbcafaff8cebfdec462402 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
   3 Date: Tue, 23 Feb 2021 10:39:48 +0100
   4 Subject: [PATCH] mips: bmips: BCM6358: disable ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Enabling this option causes kernel panics on BCM6358 with EHCI/OHCI:
  10 [    3.881739] usb 1-1: new high-speed USB device number 2 using ehci-platform
  11 [    3.895011] Reserved instruction in kernel code[#1]:
  12 [    3.900113] CPU: 0 PID: 1 Comm: init Not tainted 5.10.16 #0
  13 [    3.905829] $ 0   : 00000000 10008700 00000000 77d94060
  14 [    3.911238] $ 4   : 7fd1f088 00000000 81431cac 81431ca0
  15 [    3.916641] $ 8   : 00000000 ffffefff 8075cd34 00000000
  16 [    3.922043] $12   : 806f8d40 f3e812b7 00000000 000d9aaa
  17 [    3.927446] $16   : 7fd1f068 7fd1f080 7ff559b8 81428470
  18 [    3.932848] $20   : 00000000 00000000 55590000 77d70000
  19 [    3.938251] $24   : 00000018 00000010
  20 [    3.943655] $28   : 81430000 81431e60 81431f28 800157fc
  21 [    3.949058] Hi    : 00000000
  22 [    3.952013] Lo    : 00000000
  23 [    3.955019] epc   : 80015808 setup_sigcontext+0x54/0x24c
  24 [    3.960464] ra    : 800157fc setup_sigcontext+0x48/0x24c
  25 [    3.965913] Status: 10008703 KERNEL EXL IE
  26 [    3.970216] Cause : 00800028 (ExcCode 0a)
  27 [    3.974340] PrId  : 0002a010 (Broadcom BMIPS4350)
  28 [    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
  29 [    3.992907] Process init (pid: 1, threadinfo=(ptrval), task=(ptrval), tls=77e22ec8)
  30 [    4.000776] Stack : 81431ef4 7fd1f080 81431f28 81428470 7fd1f068 81431edc 7ff559b8 81428470
  31 [    4.009467]         81431f28 7fd1f080 55590000 77d70000 77d5498c 80015c70 806f0000 8063ae74
  32 [    4.018149]         08100002 81431f28 0000000a 08100002 81431f28 0000000a 77d6b418 00000003
  33 [    4.026831]         ffffffff 80016414 80080734 81431ecc 81431ecc 00000001 00000000 04000000
  34 [    4.035512]         77d54874 00000000 00000000 00000000 00000000 00000012 00000002 00000000
  35 [    4.044196]         ...
  36 [    4.046706] Call Trace:
  37 [    4.049238] [<80015808>] setup_sigcontext+0x54/0x24c
  38 [    4.054356] [<80015c70>] setup_frame+0xdc/0x124
  39 [    4.059015] [<80016414>] do_notify_resume+0x1dc/0x288
  40 [    4.064207] [<80011b50>] work_notifysig+0x10/0x18
  41 [    4.069036]
  42 [    4.070538] Code: 8fc300b4  00001025  26240008 <ac820000> ac830004  3c048063  0c0228aa  24846a00  26240010
  43 [    4.080686]
  44 [    4.082517] ---[ end trace 22a8edb41f5f983b ]---
  45 [    4.087374] Kernel panic - not syncing: Fatal exception
  46 [    4.092753] Rebooting in 1 seconds..
  47
  48 Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
  49 ---
  50  arch/mips/bmips/dma.c
  51  arch/mips/bmips/setup.c
  52
  53 --- a/arch/mips/bmips/dma.c
  54 +++ b/arch/mips/bmips/dma.c
  55 @@ -19,6 +19,8 @@
  56  #include <linux/types.h>
  57  #include <asm/bmips.h>
  58
  59 +int bmips_dma_sync_enabled = 1;
  60 +
  61  /*
  62   * BCM338x has configurable address translation windows which allow the
  63   * peripherals' DMA addresses to be different from the Zephyr-visible
  64 @@ -69,6 +71,9 @@ void arch_sync_dma_for_cpu_all(void)
  65         void __iomem *cbr = BMIPS_GET_CBR();
  66         u32 cfg;
  67
  68 +       if (!bmips_dma_sync_enabled)
  69 +               return;
  70 +
  71         if (boot_cpu_type() != CPU_BMIPS3300 &&
  72             boot_cpu_type() != CPU_BMIPS4350 &&
  73             boot_cpu_type() != CPU_BMIPS4380)
  74 --- a/arch/mips/bmips/setup.c
  75 +++ b/arch/mips/bmips/setup.c
  76 @@ -89,6 +89,8 @@
  77
  78  #define DDR_CSEND_REG          0x8
  79
  80 +extern int bmips_dma_sync_enabled;
  81 +
  82  static const unsigned long kbase = VMLINUX_LOAD_ADDRESS & 0xfff00000;
  83
  84  struct bmips_cpufreq {
  85 @@ -168,6 +170,9 @@ static void bcm6358_quirks(void)
  86          * disable SMP for now
  87          */
  88         bmips_smp_enabled = 0;
  89 +
  90 +       /* ARCH_HAS_SYNC_DMA_FOR_CPU_ALL causes kernel panics on BCM6358 */
  91 +       bmips_dma_sync_enabled = 0;
  92  }
  93
  94  static void bcm6368_quirks(void)