NVIDIA/open-gpu-kernel-modules
1
0
Fork 0
mirror of https://github.com/NVIDIA/open-gpu-kernel-modules.git synced 2026-02-20 23:13:58 +00:00
Code Issues Packages Projects Releases Wiki Activity

535.43.08

Browse Source
This commit is contained in:
russellcnv
2023-08-17 13:03:06 -07:00
parent eb5c7665a1
commit 18b7303c54
378 changed files with 124043 additions and 161949 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
kernel-open/nvidia-uvm/uvm_migrate.c
View File

@@ -134,6 +134,22 @@ static NV_STATUS block_migrate_map_unmapped_pages(uvm_va_block_t *va_block,
// first map operation
uvm_page_mask_complement(&va_block_context->caller_page_mask, &va_block->maybe_mapped_pages);
if (uvm_va_block_is_hmm(va_block) && !UVM_ID_IS_CPU(dest_id)) {
// Do not map pages that are already resident on the CPU. This is in
// order to avoid breaking system-wide atomic operations on HMM. HMM's
// implementation of system-side atomic operations involves restricting
// mappings to one processor (CPU or a GPU) at a time. If we were to
// grant a GPU a mapping to system memory, this gets into trouble
// because, on the CPU side, Linux can silently upgrade PTE permissions
// (move from read-only, to read-write, without any MMU notifiers
// firing), thus breaking the model by allowing simultaneous read-write
// access from two separate processors. To avoid that, just don't map
// such pages at all, when migrating.
uvm_page_mask_andnot(&va_block_context->caller_page_mask,
&va_block_context->caller_page_mask,
uvm_va_block_resident_mask_get(va_block, UVM_ID_CPU));
}
// Only map those pages that are not mapped anywhere else (likely due
// to a first touch or a migration). We pass
// UvmEventMapRemoteCauseInvalid since the destination processor of a
@@ -944,17 +960,18 @@ NV_STATUS uvm_api_migrate(UVM_MIGRATE_PARAMS *params, struct file *filp)
if (type == UVM_API_RANGE_TYPE_ATS) {
uvm_migrate_args_t uvm_migrate_args =
{
.va_space = va_space,
.mm = mm,
.start = params->base,
.length = params->length,
.dst_id = (dest_gpu ? dest_gpu->id : UVM_ID_CPU),
.dst_node_id = (int)params->cpuNumaNode,
.populate_permissions = UVM_POPULATE_PERMISSIONS_INHERIT,
.touch = false,
.skip_mapped = false,
.user_space_start = &params->userSpaceStart,
.user_space_length = &params->userSpaceLength,
.va_space = va_space,
.mm = mm,
.start = params->base,
.length = params->length,
.dst_id = (dest_gpu ? dest_gpu->id : UVM_ID_CPU),
.dst_node_id = (int)params->cpuNumaNode,
.populate_permissions = UVM_POPULATE_PERMISSIONS_INHERIT,
.touch = false,
.skip_mapped = false,
.populate_on_cpu_alloc_failures = false,
.user_space_start = &params->userSpaceStart,
.user_space_length = &params->userSpaceLength,
};
status = uvm_migrate_pageable(&uvm_migrate_args);