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author | Julian Brown <julian@codesourcery.com> | 2019-11-20 17:53:31 +0000 |
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committer | Julian Brown <jules@gcc.gnu.org> | 2019-11-20 17:53:31 +0000 |
commit | 8d2f4ddfd70f2ad9829cdc404e9c382f6fc9b072 (patch) | |
tree | f0c07d7c1a154a3c4799f63986997bc0d7e1d559 /libgomp/plugin | |
parent | 56e0452513b38110a711c402e32b34ad3a2354aa (diff) | |
download | gcc-8d2f4ddfd70f2ad9829cdc404e9c382f6fc9b072.zip gcc-8d2f4ddfd70f2ad9829cdc404e9c382f6fc9b072.tar.gz gcc-8d2f4ddfd70f2ad9829cdc404e9c382f6fc9b072.tar.bz2 |
Fix host-to-device copies from rodata for AMD GCN
libgomp/
* plugin/plugin-gcn.c (hsa_memory_copy_wrapper): New.
(copy_data, GOMP_OFFLOAD_host2dev): Use above function.
(GOMP_OFFLOAD_dev2host, GOMP_OFFLOAD_dev2dev): Check hsa_memory_copy
return code.
Reviewed-by: Andrew Stubbs <ams@codesourcery.com>
From-SVN: r278516
Diffstat (limited to 'libgomp/plugin')
-rw-r--r-- | libgomp/plugin/plugin-gcn.c | 38 |
1 files changed, 34 insertions, 4 deletions
diff --git a/libgomp/plugin/plugin-gcn.c b/libgomp/plugin/plugin-gcn.c index 5839167..392a0ee 100644 --- a/libgomp/plugin/plugin-gcn.c +++ b/libgomp/plugin/plugin-gcn.c @@ -2940,6 +2940,32 @@ maybe_init_omp_async (struct agent_info *agent) = GOMP_OFFLOAD_openacc_async_construct (agent->device_id); } +/* A wrapper that works around an issue in the HSA runtime with host-to-device + copies from read-only pages. */ + +static void +hsa_memory_copy_wrapper (void *dst, const void *src, size_t len) +{ + hsa_status_t status = hsa_fns.hsa_memory_copy_fn (dst, src, len); + + if (status == HSA_STATUS_SUCCESS) + return; + + /* It appears that the copy fails if the source data is in a read-only page. + We can't detect that easily, so try copying the data to a temporary buffer + and doing the copy again if we got an error above. */ + + GCN_WARNING ("Read-only data transfer bug workaround triggered for " + "[%p:+%d]\n", (void *) src, (int) len); + + void *src_copy = malloc (len); + memcpy (src_copy, src, len); + status = hsa_fns.hsa_memory_copy_fn (dst, (const void *) src_copy, len); + free (src_copy); + if (status != HSA_STATUS_SUCCESS) + GOMP_PLUGIN_error ("memory copy failed"); +} + /* Copy data to or from a device. This is intended for use as an async callback event. */ @@ -2950,7 +2976,7 @@ copy_data (void *data_) GCN_DEBUG ("Async thread %d:%d: Copying %zu bytes from (%p) to (%p)\n", data->aq->agent->device_id, data->aq->id, data->len, data->src, data->dst); - hsa_fns.hsa_memory_copy_fn (data->dst, data->src, data->len); + hsa_memory_copy_wrapper (data->dst, data->src, data->len); if (data->free_src) free ((void *) data->src); free (data); @@ -3643,7 +3669,9 @@ GOMP_OFFLOAD_dev2host (int device, void *dst, const void *src, size_t n) { GCN_DEBUG ("Copying %zu bytes from device %d (%p) to host (%p)\n", n, device, src, dst); - hsa_fns.hsa_memory_copy_fn (dst, src, n); + hsa_status_t status = hsa_fns.hsa_memory_copy_fn (dst, src, n); + if (status != HSA_STATUS_SUCCESS) + GOMP_PLUGIN_error ("memory copy failed"); return true; } @@ -3654,7 +3682,7 @@ GOMP_OFFLOAD_host2dev (int device, void *dst, const void *src, size_t n) { GCN_DEBUG ("Copying %zu bytes from host (%p) to device %d (%p)\n", n, src, device, dst); - hsa_fns.hsa_memory_copy_fn (dst, src, n); + hsa_memory_copy_wrapper (dst, src, n); return true; } @@ -3675,7 +3703,9 @@ GOMP_OFFLOAD_dev2dev (int device, void *dst, const void *src, size_t n) GCN_DEBUG ("Copying %zu bytes from device %d (%p) to device %d (%p)\n", n, device, src, device, dst); - hsa_fns.hsa_memory_copy_fn (dst, src, n); + hsa_status_t status = hsa_fns.hsa_memory_copy_fn (dst, src, n); + if (status != HSA_STATUS_SUCCESS) + GOMP_PLUGIN_error ("memory copy failed"); return true; } |