Re: [PATCH 1/2] ACPI/AEST: Initial AEST driver

Add support for parsing the ARM Error Source Table and basic handling of
errors reported through both memory mapped and system register interfaces.

Assume system register interfaces are only registered with private
peripheral interrupts (PPIs); otherwise there is no guarantee the
core handling the error is the core which took the error and has the
syndrome info in its system registers.

Add logging for all detected errors and trigger a kernel panic if there is
any uncorrected error present.

Signed-off-by: Tyler Baicar <redacted>
---
 MAINTAINERS                     |   1 +
 arch/arm64/include/asm/ras.h    |  52 ++++
 arch/arm64/include/asm/sysreg.h |   2 +
 arch/arm64/kernel/Makefile      |   1 +
 arch/arm64/kernel/ras.c         | 125 +++++++++
 arch/arm64/kvm/sys_regs.c       |   2 +
 drivers/acpi/arm64/Kconfig      |   3 +
 drivers/acpi/arm64/Makefile     |   1 +
 drivers/acpi/arm64/aest.c       | 450 ++++++++++++++++++++++++++++++++
 include/linux/acpi_aest.h       |  50 ++++
 include/linux/cpuhotplug.h      |   1 +
 11 files changed, 688 insertions(+)
 create mode 100644 arch/arm64/include/asm/ras.h
 create mode 100644 arch/arm64/kernel/ras.c
 create mode 100644 drivers/acpi/arm64/aest.c
 create mode 100644 include/linux/acpi_aest.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 5250298d2817..aa0483726606 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS

@@ -382,6 +382,7 @@ ACPI FOR ARM64 (ACPI/arm64)
 M:	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
 M:	Hanjun Guo <guohanjun@huawei.com>
 M:	Sudeep Holla <sudeep.holla@arm.com>
+R:	Tyler Baicar <baicar@os.amperecomputing.com>
 L:	linux-acpi@vger.kernel.org
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained

diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index 16b3f1a1d468..6bbed061d835 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h

@@ -230,6 +230,8 @@
 #define SYS_ERXADDR_EL1			sys_reg(3, 0, 5, 4, 3)
 #define SYS_ERXMISC0_EL1		sys_reg(3, 0, 5, 5, 0)
 #define SYS_ERXMISC1_EL1		sys_reg(3, 0, 5, 5, 1)
+#define SYS_ERXMISC2_EL1		sys_reg(3, 0, 5, 5, 2)
+#define SYS_ERXMISC3_EL1		sys_reg(3, 0, 5, 5, 3)
 #define SYS_TFSR_EL1			sys_reg(3, 0, 5, 6, 0)
 #define SYS_TFSRE0_EL1			sys_reg(3, 0, 5, 6, 1)
 

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index e3ec1a44f94d..dc15e9896db4 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c

@@ -1573,6 +1573,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	{ SYS_DESC(SYS_ERXADDR_EL1), trap_raz_wi },
 	{ SYS_DESC(SYS_ERXMISC0_EL1), trap_raz_wi },
 	{ SYS_DESC(SYS_ERXMISC1_EL1), trap_raz_wi },
+	{ SYS_DESC(SYS_ERXMISC2_EL1), trap_raz_wi },
+	{ SYS_DESC(SYS_ERXMISC3_EL1), trap_raz_wi },