From 75b7c05ebf902632f7f540c3eb0a8945c2d74aab Mon Sep 17 00:00:00 2001 From: Shivaprasad G Bhat Date: Mon, 29 Mar 2021 13:36:43 -0400 Subject: powerpc/papr_scm: Implement support for H_SCM_FLUSH hcall Add support for ND_REGION_ASYNC capability if the device tree indicates 'ibm,hcall-flush-required' property in the NVDIMM node. Flush is done by issuing H_SCM_FLUSH hcall to the hypervisor. If the flush request failed, the hypervisor is expected to to reflect the problem in the subsequent nvdimm H_SCM_HEALTH call. This patch prevents mmap of namespaces with MAP_SYNC flag if the nvdimm requires an explicit flush[1]. References: [1] https://github.com/avocado-framework-tests/avocado-misc-tests/blob/master/memory/ndctl.py.data/map_sync.c Signed-off-by: Shivaprasad G Bhat Reviewed-by: Aneesh Kumar K.V [mpe: Use unsigned long / long instead of uint64_t/int64_t] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/161703936121.36.7260632399582101498.stgit@e1fbed493c87 --- Documentation/powerpc/papr_hcalls.rst | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'Documentation/powerpc') diff --git a/Documentation/powerpc/papr_hcalls.rst b/Documentation/powerpc/papr_hcalls.rst index 48fcf1255a33..648f278eea8f 100644 --- a/Documentation/powerpc/papr_hcalls.rst +++ b/Documentation/powerpc/papr_hcalls.rst @@ -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" -- cgit v1.2.3 From 2886e2df10beaf50352dad7a90907251bc692029 Mon Sep 17 00:00:00 2001 From: Haren Myneni Date: Sun, 18 Apr 2021 12:29:42 -0700 Subject: Documentation/powerpc: Add proper links for manual and tests The links that are mentioned in this document are no longer valid. So changed the proper links for NXGZIP user manual and test cases. Reported-by: Bulent Abali Signed-off-by: Haren Myneni Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/08511c1e92ac239f20ac88c73c59d1f8cf02e6ad.camel@linux.ibm.com --- Documentation/powerpc/vas-api.rst | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'Documentation/powerpc') diff --git a/Documentation/powerpc/vas-api.rst b/Documentation/powerpc/vas-api.rst index 90c50ed839f3..bdb50fed903e 100644 --- a/Documentation/powerpc/vas-api.rst +++ b/Documentation/powerpc/vas-api.rst @@ -254,7 +254,7 @@ using this window. the signal will be issued to the thread group leader signals. NX-GZIP User's Manual: -https://github.com/libnxz/power-gzip/blob/master/power_nx_gzip_um.pdf +https://github.com/libnxz/power-gzip/blob/master/doc/power_nx_gzip_um.pdf Simple example ============== @@ -301,5 +301,5 @@ Simple example close(fd) or window can be closed upon process exit } - Refer https://github.com/abalib/power-gzip for tests or more + Refer https://github.com/libnxz/power-gzip for tests or more use cases. -- cgit v1.2.3