Skip to content

Avoid device memory spans in DMA address limit check #1301

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
tracycam wants to merge 2 commits into
base: main
Choose a base branch
from
Open

Avoid device memory spans in DMA address limit check #1301

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
dcf0b1d
Avoid device spans in DMA address limit check
tracycam Aug 16, 2026
c21c75a
Use managed zones for DMA address limit
tracycam Aug 16, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
13 changes: 11 additions & 2 deletions kernel-open/nvidia/nv-vm.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -227,12 +227,21 @@ static inline void nv_set_memory_type(nv_alloc_t *at, NvU32 type)
static NvU64 nv_get_max_sysmem_address(void)
{
NvU64 global_max_pfn = 0ULL;
struct zone *zone;
int node_id;
int zone_id;

for_each_online_node(node_id)
{
// node_end_pfn() returns the next PFN after the last PFN in the node.
global_max_pfn = max(global_max_pfn, (NvU64)node_end_pfn(node_id));
for (zone_id = 0; zone_id <= ZONE_NORMAL; zone_id++)
{
zone = &NODE_DATA(node_id)->node_zones[zone_id];

if (!managed_zone(zone))
continue;

global_max_pfn = max(global_max_pfn, (NvU64)zone_end_pfn(zone));
}
}

return (global_max_pfn << PAGE_SHIFT) - 1;
Expand Down