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drm/xe: Use xe_pm_runtime_get in xe_bo_move() if reclaim-safe.

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xe_bo_move() might be called in the TTM swapout path from validation
by another TTM device. If so, we are not likely to have a RPM
reference. So iff xe_pm_runtime_get() is safe to call from reclaim,
use it instead of xe_pm_runtime_get_noresume().

Strictly this is currently needed only if handle_system_ccs is true,
but use xe_pm_runtime_get() if possible anyway to increase test
coverage.

At the same time warn if handle_system_ccs is true and we can't
call xe_pm_runtime_get() from reclaim context. This will likely trip
if someone tries to enable SRIOV on LNL, without fixing Xe SRIOV
runtime resume / suspend.

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240903094232.166342-1-thomas.hellstrom@linux.intel.com
This commit is contained in:
Thomas Hellström 2024-09-03 11:42:32 +02:00
parent 8da19441d0
commit 34bb7b813a
3 changed files with 19 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/gpu/drm/xe/xe_bo.c
View File

@ -758,7 +758,16 @@ static int xe_bo_move(struct ttm_buffer_object *ttm_bo, bool evict,
xe_assert(xe, migrate);
trace_xe_bo_move(bo, new_mem->mem_type, old_mem_type, move_lacks_source);
xe_pm_runtime_get_noresume(xe);
if (xe_rpm_reclaim_safe(xe)) {
/*
* We might be called through swapout in the validation path of
* another TTM device, so unconditionally acquire rpm here.
*/
xe_pm_runtime_get(xe);
} else {
drm_WARN_ON(&xe->drm, handle_system_ccs);
xe_pm_runtime_get_noresume(xe);
}
if (xe_bo_is_pinned(bo) && !xe_bo_is_user(bo)) {
/*

9
drivers/gpu/drm/xe/xe_pm.c
View File

@ -79,7 +79,14 @@ static struct lockdep_map xe_pm_runtime_nod3cold_map = {
};
#endif
static bool __maybe_unused xe_rpm_reclaim_safe(const struct xe_device *xe)
/**
* xe_rpm_reclaim_safe() - Whether runtime resume can be done from reclaim context
* @xe: The xe device.
*
* Return: true if it is safe to runtime resume from reclaim context.
* false otherwise.
*/
bool xe_rpm_reclaim_safe(const struct xe_device *xe)
{
return !xe->d3cold.capable && !xe->info.has_sriov;
}

1
drivers/gpu/drm/xe/xe_pm.h
View File

@ -31,6 +31,7 @@ bool xe_pm_runtime_resume_and_get(struct xe_device *xe);
void xe_pm_assert_unbounded_bridge(struct xe_device *xe);
int xe_pm_set_vram_threshold(struct xe_device *xe, u32 threshold);
void xe_pm_d3cold_allowed_toggle(struct xe_device *xe);
bool xe_rpm_reclaim_safe(const struct xe_device *xe);
struct task_struct *xe_pm_read_callback_task(struct xe_device *xe);
int xe_pm_module_init(void);