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| author | Arthur Hanson Rasmusson <arthur@vgpu.io> | 2026-09-28 15:20:04 -0400 |
|---|---|---|
| committer | Arthur Hanson Rasmusson <arthur@vgpu.io> | 2026-09-28 15:20:04 -0400 |
| commit | 042b8953823190623452c0539d1b6807450aa67a (patch) | |
| tree | d009b3e6bcbe934d93fc794768fd7c53b3bd60bc /kernel/main.c | |
| parent | 41520c6dbd39e0457dcf9bafa467f9c2827a5944 (diff) | |
| download | open-iov-042b8953823190623452c0539d1b6807450aa67a.tar.gz open-iov-042b8953823190623452c0539d1b6807450aa67a.zip | |
sema: add walk_probe - trace the page-table walk for a VA
New module parameter walk_probe <va> runs the recorded-va-space walks and
the discovered-directory walk directly (pin/lat/pair map bypassed) with
per-level tracing, and prints the result of each. This separates 'the
page tables are not walkable' from 'the VA->PA pair map already answers'
when a translation is missing. Baseline on a live boot: root PDB entries
are zero (L0 e=0 idx=0) so the writes UVM issues into the level pages
have no parent entry yet.
Diffstat (limited to 'kernel/main.c')
| -rw-r--r-- | kernel/main.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/kernel/main.c b/kernel/main.c index 4f7f9ee..dcfdeed 100644 --- a/kernel/main.c +++ b/kernel/main.c @@ -2248,6 +2248,27 @@ module_param_cb(sema_probe, &nv_vgpu_sema_probe_ops, NULL, 0200); MODULE_PARM_DESC(sema_probe, "Dump sema-service map + slot values for a GPU VA"); /* + * Debug: run the page-table walks for a GPU VA with per-level tracing, + * bypassing the pin/lat/pair map (see gsp_sema_service_walk_probe): + * echo 0x20400f000 > .../parameters/walk_probe + */ +static int nv_vgpu_walk_probe_set(const char *val, const struct kernel_param *kp) +{ + u64 va = 0; + + if (kstrtoull(val, 0, &va)) + return -EINVAL; + return gsp_sema_service_walk_probe(va); +} + +static const struct kernel_param_ops nv_vgpu_walk_probe_ops = { + .set = nv_vgpu_walk_probe_set, +}; + +module_param_cb(walk_probe, &nv_vgpu_walk_probe_ops, NULL, 0200); +MODULE_PARM_DESC(walk_probe, "Trace the page-table walks for a GPU VA (hex)"); + +/* * Debug: dump the semaphore service's channel table (GPFIFO/USERD state and * the two NvNotification slots each channel exposes): * echo 1 > .../parameters/chan_dump |