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-From: =?utf-8?q?=C3=81lvaro_Fern=C3=A1ndez_Rojas?= <noltari@gmail.com>
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-Subject: [PATCH v3] mips: bmips: BCM6358: disable RAC flush for TP1
-Date: Fri, 17 Mar 2023 11:20:04 +0100
-Message-Id: <20230317102004.235879-1-noltari@gmail.com>
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-
-RAC flush causes kernel panics on BCM6358 with EHCI/OHCI when booting from TP1:
-[ 3.881739] usb 1-1: new high-speed USB device number 2 using ehci-platform
-[ 3.895011] Reserved instruction in kernel code[#1]:
-[ 3.900113] CPU: 0 PID: 1 Comm: init Not tainted 5.10.16 #0
-[ 3.905829] $ 0 : 00000000 10008700 00000000 77d94060
-[ 3.911238] $ 4 : 7fd1f088 00000000 81431cac 81431ca0
-[ 3.916641] $ 8 : 00000000 ffffefff 8075cd34 00000000
-[ 3.922043] $12 : 806f8d40 f3e812b7 00000000 000d9aaa
-[ 3.927446] $16 : 7fd1f068 7fd1f080 7ff559b8 81428470
-[ 3.932848] $20 : 00000000 00000000 55590000 77d70000
-[ 3.938251] $24 : 00000018 00000010
-[ 3.943655] $28 : 81430000 81431e60 81431f28 800157fc
-[ 3.949058] Hi : 00000000
-[ 3.952013] Lo : 00000000
-[ 3.955019] epc : 80015808 setup_sigcontext+0x54/0x24c
-[ 3.960464] ra : 800157fc setup_sigcontext+0x48/0x24c
-[ 3.965913] Status: 10008703 KERNEL EXL IE
-[ 3.970216] Cause : 00800028 (ExcCode 0a)
-[ 3.974340] PrId : 0002a010 (Broadcom BMIPS4350)
-[ 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
-[ 3.992907] Process init (pid: 1, threadinfo=(ptrval), task=(ptrval), tls=77e22ec8)
-[ 4.000776] Stack : 81431ef4 7fd1f080 81431f28 81428470 7fd1f068 81431edc 7ff559b8 81428470
-[ 4.009467] 81431f28 7fd1f080 55590000 77d70000 77d5498c 80015c70 806f0000 8063ae74
-[ 4.018149] 08100002 81431f28 0000000a 08100002 81431f28 0000000a 77d6b418 00000003
-[ 4.026831] ffffffff 80016414 80080734 81431ecc 81431ecc 00000001 00000000 04000000
-[ 4.035512] 77d54874 00000000 00000000 00000000 00000000 00000012 00000002 00000000
-[ 4.044196] ...
-[ 4.046706] Call Trace:
-[ 4.049238] [<80015808>] setup_sigcontext+0x54/0x24c
-[ 4.054356] [<80015c70>] setup_frame+0xdc/0x124
-[ 4.059015] [<80016414>] do_notify_resume+0x1dc/0x288
-[ 4.064207] [<80011b50>] work_notifysig+0x10/0x18
-[ 4.069036]
-[ 4.070538] Code: 8fc300b4 00001025 26240008 <ac820000> ac830004 3c048063 0c0228aa 24846a00 26240010
-[ 4.080686]
-[ 4.082517] ---[ end trace 22a8edb41f5f983b ]---
-[ 4.087374] Kernel panic - not syncing: Fatal exception
-[ 4.092753] Rebooting in 1 seconds..
-
-Because the bootloader (CFE) is not initializing the Read-ahead cache properly
-on the second thread (TP1). Since the RAC was not initialized properly, we
-should avoid flushing it at the risk of corrupting the instruction stream as
-seen in the trace above.
-
-Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
----
- v3: add changes suggested by Florian:
- - Switch to a bool and remove unneeded initialization.
- - Remove if from bcm6358_quirks().
- - Improve commit description and bcm6358_quirks() comment.
- v2: check if we're running on TP1 and invert logic.
-
- arch/mips/bmips/dma.c | 5 +++++
- arch/mips/bmips/setup.c | 8 ++++++++
- 2 files changed, 13 insertions(+)
-
---- a/arch/mips/bmips/dma.c
-+++ b/arch/mips/bmips/dma.c
-@@ -64,6 +64,8 @@ phys_addr_t dma_to_phys(struct device *d
- return dma_addr;
- }
-
-+bool bmips_rac_flush_disable;
-+
- void arch_sync_dma_for_cpu_all(void)
- {
- void __iomem *cbr = BMIPS_GET_CBR();
-@@ -74,6 +76,9 @@ void arch_sync_dma_for_cpu_all(void)
- boot_cpu_type() != CPU_BMIPS4380)
- return;
-
-+ if (unlikely(bmips_rac_flush_disable))
-+ return;
-+
- /* Flush stale data out of the readahead cache */
- cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
- __raw_writel(cfg | 0x100, cbr + BMIPS_RAC_CONFIG);
---- a/arch/mips/bmips/setup.c
-+++ b/arch/mips/bmips/setup.c
-@@ -34,6 +34,8 @@
- #define REG_BCM6328_OTP ((void __iomem *)CKSEG1ADDR(0x1000062c))
- #define BCM6328_TP1_DISABLED BIT(9)
-
-+extern bool bmips_rac_flush_disable;
-+
- static const unsigned long kbase = VMLINUX_LOAD_ADDRESS & 0xfff00000;
-
- struct bmips_quirk {
-@@ -103,6 +105,12 @@ static void bcm6358_quirks(void)
- * disable SMP for now
- */
- bmips_smp_enabled = 0;
-+
-+ /*
-+ * RAC flush causes kernel panics on BCM6358 when booting from TP1
-+ * because the bootloader is not initializing it properly.
-+ */
-+ bmips_rac_flush_disable = !!(read_c0_brcm_cmt_local() & (1 << 31));
- }
-
- static void bcm6368_quirks(void)
projects / openwrt / staging / dedeckeh.git / commitdiff