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Diffstat (limited to 'Documentation/powerpc/papr_hcalls.rst')
| -rw-r--r-- | Documentation/powerpc/papr_hcalls.rst | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/Documentation/powerpc/papr_hcalls.rst b/Documentation/powerpc/papr_hcalls.rst index 48fcf1255a33..fce8bc793660 100644 --- a/Documentation/powerpc/papr_hcalls.rst +++ b/Documentation/powerpc/papr_hcalls.rst @@ -40,7 +40,7 @@ and any in-arguments for the hcall are provided in registers *r4-r12*. If values have to be passed through a memory buffer, the data stored in that buffer should be in Big-endian byte order. -Once control is returns back to the guest after hypervisor has serviced the +Once control returns back to the guest after hypervisor has serviced the 'HVCS' instruction the return value of the hcall is available in *r3* and any out values are returned in registers *r4-r12*. Again like in case of in-arguments, any out values stored in a memory buffer will be in Big-endian byte order. @@ -147,7 +147,7 @@ corresponding opcode values please look into the arch specific header [4]_: | Out: *numBytesRead* | Return Value: *H_Success, H_Parameter, H_P2, H_P3, H_Hardware* -Given a DRC Index of an NVDIMM, read N-bytes from the the metadata area +Given a DRC Index of an NVDIMM, read N-bytes from the metadata area associated with it, at a specified offset and copy it to provided buffer. The metadata area stores configuration information such as label information, bad-blocks etc. The metadata area is located out-of-band of NVDIMM storage @@ -275,6 +275,20 @@ Health Bitmap Flags: Given a DRC Index collect the performance statistics for NVDIMM and copy them to the resultBuffer. +**H_SCM_FLUSH** + +| Input: *drcIndex, continue-token* +| Out: *continue-token* +| Return Value: *H_SUCCESS, H_Parameter, H_P2, H_BUSY* + +Given a DRC Index Flush the data to backend NVDIMM device. + +The hcall returns H_BUSY when the flush takes longer time and the hcall needs +to be issued multiple times in order to be completely serviced. The +*continue-token* from the output to be passed in the argument list of +subsequent hcalls to the hypervisor until the hcall is completely serviced +at which point H_SUCCESS or other error is returned by the hypervisor. + References ========== .. [1] "Power Architecture Platform Reference" |