/**
* intel_gvt_reset_vgpu_locked - reset a virtual GPU by DMLR or GT reset
* @vgpu: virtual GPU
* @dmlr: vGPU Device Model Level Reset or GT Reset
* @engine_mask: engines to reset for GT reset
*
* This function is called when user wants to reset a virtual GPU through
* device model reset or GT reset. The caller should hold the gvt lock.
*
* vGPU Device Model Level Reset (DMLR) simulates the PCI level reset to reset
* the whole vGPU to default state as when it is created. This vGPU function
* is required both for functionary and security concerns.The ultimate goal
* of vGPU FLR is that reuse a vGPU instance by virtual machines. When we
* assign a vGPU to a virtual machine we must isse such reset first.
*
* Full GT Reset and Per-Engine GT Reset are soft reset flow for GPU engines
* (Render, Blitter, Video, Video Enhancement). It is defined by GPU Spec.
* Unlike the FLR, GT reset only reset particular resource of a vGPU per
* the reset request. Guest driver can issue a GT reset by programming the
* virtual GDRST register to reset specific virtual GPU engine or all
* engines.
*
* The parameter dev_level is to identify if we will do DMLR or GT reset.
* The parameter engine_mask is to specific the engines that need to be
* resetted. If value ALL_ENGINES is given for engine_mask, it means
* the caller requests a full GT reset that we will reset all virtual
* GPU engines. For FLR, engine_mask is ignored.
*/
void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr,
unsigned int engine_mask)
{
struct intel_gvt *gvt = vgpu->gvt;
struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
unsigned int resetting_eng = dmlr ? ALL_ENGINES : engine_mask;
gvt_dbg_core("------------------------------------------\n");
gvt_dbg_core("resseting vgpu%d, dmlr %d, engine_mask %08x\n",
vgpu->id, dmlr, engine_mask);
vgpu->resetting_eng = resetting_eng;
intel_vgpu_stop_schedule(vgpu);
/*
* The current_vgpu will set to NULL after stopping the
* scheduler when the reset is triggered by current vgpu.
*/
if (scheduler->current_vgpu == NULL) {
mutex_unlock(&gvt->lock);
intel_gvt_wait_vgpu_idle(vgpu);
mutex_lock(&gvt->lock);
}
intel_vgpu_reset_submission(vgpu, resetting_eng);
/* full GPU reset or device model level reset */
if (engine_mask == ALL_ENGINES || dmlr) {
intel_vgpu_select_submission_ops(vgpu, ALL_ENGINES, 0);
/*fence will not be reset during virtual reset */
if (dmlr) {
intel_vgpu_reset_gtt(vgpu);
intel_vgpu_reset_resource(vgpu);
}
intel_vgpu_reset_mmio(vgpu, dmlr);
populate_pvinfo_page(vgpu);
intel_vgpu_reset_display(vgpu);
if (dmlr) {
intel_vgpu_reset_cfg_space(vgpu);
/* only reset the failsafe mode when dmlr reset */
vgpu->failsafe = false;
vgpu->pv_notified = false;
}
}
vgpu->resetting_eng = 0;
gvt_dbg_core("reset vgpu%d done\n", vgpu->id);
gvt_dbg_core("------------------------------------------\n");
}
/**
* intel_gvt_reset_vgpu_locked - reset a virtual GPU by DMLR or GT reset
* @vgpu: virtual GPU
* @dmlr: vGPU Device Model Level Reset or GT Reset
* @engine_mask: engines to reset for GT reset
*
* This function is called when user wants to reset a virtual GPU through
* device model reset or GT reset. The caller should hold the gvt lock.
*
* vGPU Device Model Level Reset (DMLR) simulates the PCI level reset to reset
* the whole vGPU to default state as when it is created. This vGPU function
* is required both for functionary and security concerns.The ultimate goal
* of vGPU FLR is that reuse a vGPU instance by virtual machines. When we
* assign a vGPU to a virtual machine we must isse such reset first.
*
* Full GT Reset and Per-Engine GT Reset are soft reset flow for GPU engines
* (Render, Blitter, Video, Video Enhancement). It is defined by GPU Spec.
* Unlike the FLR, GT reset only reset particular resource of a vGPU per
* the reset request. Guest driver can issue a GT reset by programming the
* virtual GDRST register to reset specific virtual GPU engine or all
* engines.
*
* The parameter dev_level is to identify if we will do DMLR or GT reset.
* The parameter engine_mask is to specific the engines that need to be
* resetted. If value ALL_ENGINES is given for engine_mask, it means
* the caller requests a full GT reset that we will reset all virtual
* GPU engines. For FLR, engine_mask is ignored.
*/
void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr,
unsigned int engine_mask)
{
struct intel_gvt *gvt = vgpu->gvt;
struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
gvt_dbg_core("------------------------------------------\n");
gvt_dbg_core("resseting vgpu%d, dmlr %d, engine_mask %08x\n",
vgpu->id, dmlr, engine_mask);
vgpu->resetting = true;
intel_vgpu_stop_schedule(vgpu);
/*
* The current_vgpu will set to NULL after stopping the
* scheduler when the reset is triggered by current vgpu.
*/
if (scheduler->current_vgpu == NULL) {
mutex_unlock(&gvt->lock);
intel_gvt_wait_vgpu_idle(vgpu);
mutex_lock(&gvt->lock);
}
intel_vgpu_reset_execlist(vgpu, dmlr ? ALL_ENGINES : engine_mask);
/* full GPU reset or device model level reset */
if (engine_mask == ALL_ENGINES || dmlr) {
intel_vgpu_reset_gtt(vgpu, dmlr);
intel_vgpu_reset_resource(vgpu);
intel_vgpu_reset_mmio(vgpu);
populate_pvinfo_page(vgpu);
intel_vgpu_reset_display(vgpu);
if (dmlr)
intel_vgpu_reset_cfg_space(vgpu);
}
vgpu->resetting = false;
gvt_dbg_core("reset vgpu%d done\n", vgpu->id);
gvt_dbg_core("------------------------------------------\n");
}