[Intel-gfx] [PATCH 08/20] drm/i915/buddy: adjust res->start

Matthew Auld
2022-01-26T15:22:55Z

Differentiate between mappable vs non-mappable resources, also if this
is an actual range allocation ensure we set res->start as the starting
pfn. Later when we need to do non-mappable -> mappable moves then we
want TTM to see that the current placement is not compatible, which
should result in an actual move, instead of being turned into a noop.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
drivers/gpu/drm/i915/i915_ttm_buddy_manager.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
index 6e5842155898..bc725a92fc5c 100644
--- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
+++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
@@ -140,6 +140,13 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
mutex_unlock(&bman->lock);
}

+ if (place->lpfn - place->fpfn == n_pages)
+ bman_res->base.start = place->fpfn;
+ else if (lpfn <= bman->visible_size)
+ bman_res->base.start = 0;
+ else
+ bman_res->base.start = bman->visible_size;
+
*res = &bman_res->base;
return 0;

--
2.34.1