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Message-Id: <20230123031728.22515-1-lina@asahilina.net>
Date: Mon, 23 Jan 2023 12:17:28 +0900
From: Asahi Lina <lina@...hilina.net>
To: Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>
Cc: Alyssa Rosenzweig <alyssa@...enzweig.io>, asahi@...ts.linux.dev,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Asahi Lina <lina@...hilina.net>,
Eric Curtin <ecurtin@...hat.com>
Subject: [PATCH v2] soc: apple: rtkit: Add register dump decoding to crashlog
When the coprocessor crashes, it's useful to get a proper register dump
so we can find out what the firmware was doing. Add a decoder for this.
Originally this had ESR decoding by reusing the ARM64 arch header for
this, but that introduces some module linking and cross-arch compilation
issues, so let's leave that out for now.
Reviewed-by: Sven Peter <sven@...npeter.dev>
Reviewed-by: Eric Curtin <ecurtin@...hat.com>
Signed-off-by: Asahi Lina <lina@...hilina.net>
---
drivers/soc/apple/rtkit-crashlog.c | 93 ++++++++++++++++++++++++++++++
1 file changed, 93 insertions(+)
diff --git a/drivers/soc/apple/rtkit-crashlog.c b/drivers/soc/apple/rtkit-crashlog.c
index 732deed64660..dfa74b32eda2 100644
--- a/drivers/soc/apple/rtkit-crashlog.c
+++ b/drivers/soc/apple/rtkit-crashlog.c
@@ -13,6 +13,17 @@
#define APPLE_RTKIT_CRASHLOG_VERSION FOURCC('C', 'v', 'e', 'r')
#define APPLE_RTKIT_CRASHLOG_MBOX FOURCC('C', 'm', 'b', 'x')
#define APPLE_RTKIT_CRASHLOG_TIME FOURCC('C', 't', 'i', 'm')
+#define APPLE_RTKIT_CRASHLOG_REGS FOURCC('C', 'r', 'g', '8')
+
+/* For COMPILE_TEST on non-ARM64 architectures */
+#ifndef PSR_MODE_EL0t
+#define PSR_MODE_EL0t 0x00000000
+#define PSR_MODE_EL1t 0x00000004
+#define PSR_MODE_EL1h 0x00000005
+#define PSR_MODE_EL2t 0x00000008
+#define PSR_MODE_EL2h 0x00000009
+#define PSR_MODE_MASK 0x0000000f
+#endif
struct apple_rtkit_crashlog_header {
u32 fourcc;
@@ -31,6 +42,24 @@ struct apple_rtkit_crashlog_mbox_entry {
};
static_assert(sizeof(struct apple_rtkit_crashlog_mbox_entry) == 0x18);
+struct apple_rtkit_crashlog_regs {
+ u32 unk_0;
+ u32 unk_4;
+ u64 regs[31];
+ u64 sp;
+ u64 pc;
+ u64 psr;
+ u64 cpacr;
+ u64 fpsr;
+ u64 fpcr;
+ u64 unk[64];
+ u64 far;
+ u64 unk_X;
+ u64 esr;
+ u64 unk_Z;
+};
+static_assert(sizeof(struct apple_rtkit_crashlog_regs) == 0x350);
+
static void apple_rtkit_crashlog_dump_str(struct apple_rtkit *rtk, u8 *bfr,
size_t size)
{
@@ -94,6 +123,66 @@ static void apple_rtkit_crashlog_dump_mailbox(struct apple_rtkit *rtk, u8 *bfr,
}
}
+static void apple_rtkit_crashlog_dump_regs(struct apple_rtkit *rtk, u8 *bfr,
+ size_t size)
+{
+ struct apple_rtkit_crashlog_regs regs;
+ const char *el;
+ int i;
+
+ if (size < sizeof(regs)) {
+ dev_warn(rtk->dev, "RTKit: Regs section too small: 0x%zx", size);
+ return;
+ }
+
+ memcpy(®s, bfr, sizeof(regs));
+
+ switch (regs.psr & PSR_MODE_MASK) {
+ case PSR_MODE_EL0t:
+ el = "EL0t";
+ break;
+ case PSR_MODE_EL1t:
+ el = "EL1t";
+ break;
+ case PSR_MODE_EL1h:
+ el = "EL1h";
+ break;
+ case PSR_MODE_EL2t:
+ el = "EL2t";
+ break;
+ case PSR_MODE_EL2h:
+ el = "EL2h";
+ break;
+ default:
+ el = "unknown";
+ break;
+ }
+
+ dev_warn(rtk->dev, "RTKit: Exception dump:");
+ dev_warn(rtk->dev, " == Exception taken from %s ==", el);
+ dev_warn(rtk->dev, " PSR = 0x%llx", regs.psr);
+ dev_warn(rtk->dev, " PC = 0x%llx\n", regs.pc);
+ dev_warn(rtk->dev, " ESR = 0x%llx\n", regs.esr);
+ dev_warn(rtk->dev, " FAR = 0x%llx\n", regs.far);
+ dev_warn(rtk->dev, " SP = 0x%llx\n", regs.sp);
+ dev_warn(rtk->dev, "\n");
+
+ for (i = 0; i < 31; i += 4) {
+ if (i < 28)
+ dev_warn(rtk->dev,
+ " x%02d-x%02d = %016llx %016llx %016llx %016llx\n",
+ i, i + 3,
+ regs.regs[i], regs.regs[i + 1],
+ regs.regs[i + 2], regs.regs[i + 3]);
+ else
+ dev_warn(rtk->dev,
+ " x%02d-x%02d = %016llx %016llx %016llx\n", i, i + 3,
+ regs.regs[i], regs.regs[i + 1], regs.regs[i + 2]);
+ }
+
+ dev_warn(rtk->dev, "\n");
+}
+
void apple_rtkit_crashlog_dump(struct apple_rtkit *rtk, u8 *bfr, size_t size)
{
size_t offset;
@@ -140,6 +229,10 @@ void apple_rtkit_crashlog_dump(struct apple_rtkit *rtk, u8 *bfr, size_t size)
apple_rtkit_crashlog_dump_time(rtk, bfr + offset + 16,
section_size);
break;
+ case APPLE_RTKIT_CRASHLOG_REGS:
+ apple_rtkit_crashlog_dump_regs(rtk, bfr + offset + 16,
+ section_size);
+ break;
default:
dev_warn(rtk->dev,
"RTKit: Unknown crashlog section: %x",
--
2.35.1
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