[Intel-xe] [PATCH] drm/xe: Limit system memory size of half of system memory

[José Roberto de Souza]

ttm_global_init() imposes this limitation.

Cc: Matthew Auld <matthew.auld at intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/xe/xe_ttm_sys_mgr.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c b/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c
index 5b0674bbb8ed0..3e1fa0c832cab 100644
--- a/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c
+++ b/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c
@@ -105,7 +105,10 @@ int xe_ttm_sys_mgr_init(struct xe_device *xe)
 	u64 gtt_size;
 
 	si_meminfo(&si);
-	gtt_size = (u64)si.totalram * si.mem_unit * 3/4;
+	gtt_size = (u64)si.totalram * si.mem_unit;
+	/* TTM limits allocation of all TTM devices by 50% of system memory */
+	gtt_size /= 2;
+
 	man->use_tt = true;
 	man->func = &xe_ttm_sys_mgr_func;
 	ttm_resource_manager_init(man, &xe->ttm, gtt_size >> PAGE_SHIFT);
-- 
2.40.0