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| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2019-09-03 18:04:52 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-09-25 08:32:59 +1000 |
| commit | faa6d21153fd11e139dd880044521389b34a24f2 (patch) | |
| tree | 34449539d8880b65cfb1e6b3a62c4bd866a0f5aa /arch/mips/mm/mmap.c | |
| parent | 4111cdef0e871c0f7c8874b19ee68a3671f7d63e (diff) | |
| download | linux-faa6d21153fd11e139dd880044521389b34a24f2.tar.bz2 | |
powerpc/nvdimm: use H_SCM_QUERY hcall on H_OVERLAP error
Right now we force an unbind of SCM memory at drcindex on H_OVERLAP error.
This really slows down operations like kexec where we get the H_OVERLAP
error because we don't go through a full hypervisor re init.
H_OVERLAP error for a H_SCM_BIND_MEM hcall indicates that SCM memory at
drc index is already bound. Since we don't specify a logical memory
address for bind hcall, we can use the H_SCM_QUERY hcall to query
the already bound logical address.
Boot time difference with and without patch is:
[ 5.583617] IOMMU table initialized, virtual merging enabled
[ 5.603041] papr_scm ibm,persistent-memory:ibm,pmemory@44104001: Retrying bind after unbinding
[ 301.514221] papr_scm ibm,persistent-memory:ibm,pmemory@44108001: Retrying bind after unbinding
[ 340.057238] hv-24x7: read 1530 catalog entries, created 537 event attrs (0 failures), 275 descs
after fix
[ 5.101572] IOMMU table initialized, virtual merging enabled
[ 5.116984] papr_scm ibm,persistent-memory:ibm,pmemory@44104001: Querying SCM details
[ 5.117223] papr_scm ibm,persistent-memory:ibm,pmemory@44108001: Querying SCM details
[ 5.120530] hv-24x7: read 1530 catalog entries, created 537 event attrs (0 failures), 275 descs
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190903123452.28620-2-aneesh.kumar@linux.ibm.com
Diffstat (limited to 'arch/mips/mm/mmap.c')
0 files changed, 0 insertions, 0 deletions