From b52f8d7a8f38629e3a9d1d372f2fe43e3a27d6b2 Mon Sep 17 00:00:00 2001 From: Michal Wajdeczko Date: Fri, 1 Aug 2025 16:44:18 +0200 Subject: [PATCH] drm/xe/pf: Skip LMTT update if no LMEM was provisioned MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit During VF unprovisioning, if VF was not provisioned with LMEM, there is no need to trigger LMTT update, as VF LMTT was never set. This will spare us sending full TLB invalidation requests. Signed-off-by: Michal Wajdeczko Reviewed-by: Piotr Piórkowski Reviewed-by: Jonathan Cavitt Link: https://lore.kernel.org/r/20250801144418.180584-1-michal.wajdeczko@intel.com --- drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c b/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c index f00cce81f1ff..c8f0320d032f 100644 --- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c +++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c @@ -1434,7 +1434,8 @@ fail: return err; } -static void pf_release_vf_config_lmem(struct xe_gt *gt, struct xe_gt_sriov_config *config) +/* Return: %true if there was an LMEM provisioned, %false otherwise */ +static bool pf_release_vf_config_lmem(struct xe_gt *gt, struct xe_gt_sriov_config *config) { xe_gt_assert(gt, IS_DGFX(gt_to_xe(gt))); xe_gt_assert(gt, xe_gt_is_main_type(gt)); @@ -1443,7 +1444,9 @@ static void pf_release_vf_config_lmem(struct xe_gt *gt, struct xe_gt_sriov_confi if (config->lmem_obj) { xe_bo_unpin_map_no_vm(config->lmem_obj); config->lmem_obj = NULL; + return true; } + return false; } static int pf_provision_vf_lmem(struct xe_gt *gt, unsigned int vfid, u64 size) @@ -2021,12 +2024,13 @@ static void pf_release_vf_config(struct xe_gt *gt, unsigned int vfid) { struct xe_gt_sriov_config *config = pf_pick_vf_config(gt, vfid); struct xe_device *xe = gt_to_xe(gt); + bool released; if (xe_gt_is_main_type(gt)) { pf_release_vf_config_ggtt(gt, config); if (IS_DGFX(xe)) { - pf_release_vf_config_lmem(gt, config); - if (xe_device_has_lmtt(xe)) + released = pf_release_vf_config_lmem(gt, config); + if (released && xe_device_has_lmtt(xe)) pf_update_vf_lmtt(xe, vfid); } } -- 2.51.0