From: Xiaolin Zhang xiaolin.zhang@intel.com
commit 0a3242bdb47713e09cb004a0ba4947d3edf82d8a upstream.
when creating a vGPU workload, the guest context head pointer should be updated correctly by comparing with the exsiting workload in the guest worklod queue including the current running context.
in some situation, there is a running context A and then received 2 new vGPU workload context B and A. in the new workload context A, it's head pointer should be updated with the running context A's tail.
v2: walk through guest workload list in backward way.
Cc: stable@vger.kernel.org Signed-off-by: Xiaolin Zhang xiaolin.zhang@intel.com Reviewed-by: Zhenyu Wang zhenyuw@linux.intel.com Signed-off-by: Zhenyu Wang zhenyuw@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/gpu/drm/i915/gvt/scheduler.c | 28 +++++++++++++++------------- 1 file changed, 15 insertions(+), 13 deletions(-)
--- a/drivers/gpu/drm/i915/gvt/scheduler.c +++ b/drivers/gpu/drm/i915/gvt/scheduler.c @@ -1424,9 +1424,6 @@ static int prepare_mm(struct intel_vgpu_ #define same_context(a, b) (((a)->context_id == (b)->context_id) && \ ((a)->lrca == (b)->lrca))
-#define get_last_workload(q) \ - (list_empty(q) ? NULL : container_of(q->prev, \ - struct intel_vgpu_workload, list)) /** * intel_vgpu_create_workload - create a vGPU workload * @vgpu: a vGPU @@ -1446,7 +1443,7 @@ intel_vgpu_create_workload(struct intel_ { struct intel_vgpu_submission *s = &vgpu->submission; struct list_head *q = workload_q_head(vgpu, ring_id); - struct intel_vgpu_workload *last_workload = get_last_workload(q); + struct intel_vgpu_workload *last_workload = NULL; struct intel_vgpu_workload *workload = NULL; struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv; u64 ring_context_gpa; @@ -1472,15 +1469,20 @@ intel_vgpu_create_workload(struct intel_ head &= RB_HEAD_OFF_MASK; tail &= RB_TAIL_OFF_MASK;
- if (last_workload && same_context(&last_workload->ctx_desc, desc)) { - gvt_dbg_el("ring id %d cur workload == last\n", ring_id); - gvt_dbg_el("ctx head %x real head %lx\n", head, - last_workload->rb_tail); - /* - * cannot use guest context head pointer here, - * as it might not be updated at this time - */ - head = last_workload->rb_tail; + list_for_each_entry_reverse(last_workload, q, list) { + + if (same_context(&last_workload->ctx_desc, desc)) { + gvt_dbg_el("ring id %d cur workload == last\n", + ring_id); + gvt_dbg_el("ctx head %x real head %lx\n", head, + last_workload->rb_tail); + /* + * cannot use guest context head pointer here, + * as it might not be updated at this time + */ + head = last_workload->rb_tail; + break; + } }
gvt_dbg_el("ring id %d begin a new workload\n", ring_id);