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libgomp: enable reverse offload for AMDGCN

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libgomp/ChangeLog:

	* libgomp.texi (5.0 Impl. Status, gcn specifics): Update for
	reverse offload.
	* plugin/plugin-gcn.c (GOMP_OFFLOAD_get_num_devices): Accept
	reverse-offload requirement.
This commit is contained in:
Tobias Burnus 2023-02-03 08:33:17 +01:00
parent 167b04b9b8
commit f84fdb134d
2 changed files with 10 additions and 6 deletions
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13
libgomp/libgomp.texi
View file

@ -227,8 +227,7 @@ The OpenMP 4.5 specification is fully supported.
@item @code{allocate} directive @tab N @tab
@item @code{allocate} clause @tab P @tab Initial support
@item @code{use_device_addr} clause on @code{target data} @tab Y @tab
@item @code{ancestor} modifier on @code{device} clause
@tab Y @tab Host fallback with GCN devices
@item @code{ancestor} modifier on @code{device} clause @tab Y @tab
@item Implicit declare target directive @tab Y @tab
@item Discontiguous array section with @code{target update} construct
@tab N @tab
@ -4455,9 +4454,13 @@ The implementation remark:
@item I/O within OpenMP target regions and OpenACC parallel/kernels is supported
using the C library @code{printf} functions and the Fortran
@code{print}/@code{write} statements.
@item OpenMP code that has a requires directive with @code{unified_address},
@code{unified_shared_memory} or @code{reverse_offload} will remove
any GCN device from the list of available devices (``host fallback'').
@item Reverse offload (i.e. @code{target} regions with
@code{device(ancestor:1)}) are processed serially per @code{target} region
such that the next reverse offload region is only executed after the previous
one returned.
@item OpenMP code that has a requires directive with @code{unified_address} or
@code{unified_shared_memory} will remove any GCN device from the list of
available devices (``host fallback'').
@end itemize

3
libgomp/plugin/plugin-gcn.c
View file

@ -3262,7 +3262,8 @@ GOMP_OFFLOAD_get_num_devices (unsigned int omp_requires_mask)
return 0;
/* Return -1 if no omp_requires_mask cannot be fulfilled but
devices were present. */
if (hsa_context.agent_count > 0 && omp_requires_mask != 0)
if (hsa_context.agent_count > 0
&& (omp_requires_mask & ~GOMP_REQUIRES_REVERSE_OFFLOAD) != 0)
return -1;
return hsa_context.agent_count;
}