diff options
| author | Akshay Gupta <akshay.gupta@amd.com> | 2025-04-28 09:30:32 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-05-21 15:44:41 +0300 |
| commit | 69b1ba83d21c4a89f6fcfbca1d515a60df65cf9e (patch) | |
| tree | 77c29746e3cf7866fcae44a4ef5542e441b9a77f /include | |
| parent | bb13a84ed6b78200952b264b4d7a024b730e8246 (diff) | |
| download | linux-69b1ba83d21c4a89f6fcfbca1d515a60df65cf9e.tar.xz | |
misc: amd-sbi: Add support for read MCA register protocol
- AMD provides custom protocol to read Machine Check Architecture(MCA)
registers over sideband. The information is accessed for range of
MCA registers by passing register address and thread ID to the protocol.
MCA register read command using the register address to access
Core::X86::Msr::MCG_CAP which determines the number of MCA banks.
Access is read-only
Reviewed-by: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@amd.com>
Signed-off-by: Akshay Gupta <akshay.gupta@amd.com>
Link: https://lore.kernel.org/r/20250428063034.2145566-9-akshay.gupta@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/misc/amd-apml.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/include/uapi/misc/amd-apml.h b/include/uapi/misc/amd-apml.h index bb57dc75758a..f718675d3966 100644 --- a/include/uapi/misc/amd-apml.h +++ b/include/uapi/misc/amd-apml.h @@ -43,6 +43,21 @@ struct apml_cpuid_msg { __u32 pad; }; +struct apml_mcamsr_msg { + /* + * MCAMSR input + * [0]...[3] mca msr func, + * [4][5] thread + * MCAMSR output + */ + __u64 mcamsr_in_out; + /* + * Status code for MCA/MSR access + */ + __u32 fw_ret_code; + __u32 pad; +}; + /* * AMD sideband interface base IOCTL */ @@ -85,4 +100,22 @@ struct apml_cpuid_msg { */ #define SBRMI_IOCTL_CPUID_CMD _IOWR(SB_BASE_IOCTL_NR, 1, struct apml_cpuid_msg) +/** + * DOC: SBRMI_IOCTL_MCAMSR_CMD + * + * @Parameters + * + * @struct apml_mcamsr_msg + * Pointer to the &struct apml_mcamsr_msg that will contain the protocol + * information + * + * @Description + * IOCTL command for APML messages using generic _IOWR + * The IOCTL provides userspace access to AMD sideband MCAMSR protocol + * - MCAMSR protocol to get MCA bank details for Function at thread level + * - returning "-EFAULT" if none of the above + * "-EPROTOTYPE" error is returned to provide additional error details + */ +#define SBRMI_IOCTL_MCAMSR_CMD _IOWR(SB_BASE_IOCTL_NR, 2, struct apml_mcamsr_msg) + #endif /*_AMD_APML_H_*/ |