diff options
author | Colin Xu <colin.xu@intel.com> | 2018-05-19 12:28:54 +0800 |
---|---|---|
committer | Zhenyu Wang <zhenyuw@linux.intel.com> | 2018-05-18 12:39:02 +0800 |
commit | f25a49ab8ab9c1b5587837c8a386b276403f315c (patch) | |
tree | 2d3784435a9f24420fd10cbacaaa84864913acde /drivers/gpu/drm/i915/gvt/vgpu.c | |
parent | 579e2f6d999991d2d2dd39c7185cba0a97137cee (diff) | |
download | linux-f25a49ab8ab9c1b5587837c8a386b276403f315c.tar.bz2 |
drm/i915/gvt: Use vgpu_lock to protect per vgpu access
The patch set splits out 2 small locks from the original big gvt lock:
- vgpu_lock protects per-vGPU data and logic, especially the vGPU
trap emulation path.
- sched_lock protects gvt scheudler structure, context schedule logic
and vGPU's schedule data.
Use vgpu_lock to replace the gvt big lock. By doing this, the
mmio read/write trap path, vgpu virtual event emulation and other
vgpu related process, would be protected under per vgpu_lock.
v9:
- Change commit author since the patches are improved a lot compared
with original version.
Original author: Pei Zhang <pei.zhang@intel.com>
- Rebase to latest gvt-staging.
v8:
- Correct coding and comment style.
- Rebase to latest gvt-staging.
v7:
- Remove gtt_lock since already proteced by gvt_lock and vgpu_lock.
- Fix a typo in intel_gvt_deactivate_vgpu, unlock the wrong lock.
v6:
- Rebase to latest gvt-staging.
v5:
- Rebase to latest gvt-staging.
- intel_vgpu_page_track_handler should use vgpu_lock.
v4:
- Rebase to latest gvt-staging.
- Protect vgpu->active access with vgpu_lock.
- Do not wait gpu idle in vgpu_lock.
v3: update to latest code base
v2: add gvt->lock in function gvt_check_vblank_emulation
Performance comparison on Kabylake platform.
- Configuration:
Host: Ubuntu 16.04.
Guest 1 & 2: Ubuntu 16.04.
glmark2 score comparison:
- Configuration:
Host: glxgears.
Guests: glmark2.
+--------------------------------+-----------------+
| Setup | glmark2 score |
+--------------------------------+-----------------+
| unified lock, iommu=on | 58~62 (avg. 60) |
+--------------------------------+-----------------+
| unified lock, iommu=igfx_off | 57~61 (avg. 59) |
+--------------------------------+-----------------+
| per-logic lock, iommu=on | 60~68 (avg. 64) |
+--------------------------------+-----------------+
| per-logic lock, iommu=igfx_off | 61~67 (avg. 64) |
+--------------------------------+-----------------+
lock_stat comparison:
- Configuration:
Stop lock stat immediately after boot up.
Boot 2 VM Guests.
Run glmark2 in guests.
Start perf lock_stat for 20 seconds and stop again.
- Legend: c - contentions; w - waittime-avg
+------------+-----------------+-----------+---------------+------------+
| | gvt_lock |sched_lock | vgpu_lock | gtt_lock |
+ lock type; +-----------------+-----------+---------------+------------+
| iommu set | c | w | c | w | c | w | c | w |
+------------+-------+---------+----+------+------+--------+-----+------+
| unified; | 20697 | 839 |N/A | N/A | N/A | N/A | N/A | N/A |
| on | | | | | | | | |
+------------+-------+---------+----+------+------+--------+-----+------+
| unified; | 21838 | 658.15 |N/A | N/A | N/A | N/A | N/A | N/A |
| igfx_off | | | | | | | | |
+------------+-------+---------+----+------+------+--------+-----+------+
| per-logic; | 1553 | 1599.96 |9458|429.97| 5846 | 274.33 | 0 | 0.00 |
| on | | | | | | | | |
+------------+-------+---------+----+------+------+--------+-----+------+
| per-logic; | 1911 | 1678.32 |8335|445.16| 5451 | 244.80 | 0 | 0.00 |
| igfx_off | | | | | | | | |
+------------+-------+---------+----+------+------+--------+-----+------+
Signed-off-by: Pei Zhang <pei.zhang@intel.com>
Signed-off-by: Colin Xu <colin.xu@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915/gvt/vgpu.c')
-rw-r--r-- | drivers/gpu/drm/i915/gvt/vgpu.c | 53 |
1 files changed, 27 insertions, 26 deletions
diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c index bf75300c1ec1..889d10f8ee96 100644 --- a/drivers/gpu/drm/i915/gvt/vgpu.c +++ b/drivers/gpu/drm/i915/gvt/vgpu.c @@ -226,22 +226,20 @@ void intel_gvt_activate_vgpu(struct intel_vgpu *vgpu) */ void intel_gvt_deactivate_vgpu(struct intel_vgpu *vgpu) { - struct intel_gvt *gvt = vgpu->gvt; - - mutex_lock(&gvt->lock); + mutex_lock(&vgpu->vgpu_lock); vgpu->active = false; if (atomic_read(&vgpu->submission.running_workload_num)) { - mutex_unlock(&gvt->lock); + mutex_unlock(&vgpu->vgpu_lock); intel_gvt_wait_vgpu_idle(vgpu); - mutex_lock(&gvt->lock); + mutex_lock(&vgpu->vgpu_lock); } intel_vgpu_stop_schedule(vgpu); intel_vgpu_dmabuf_cleanup(vgpu); - mutex_unlock(&gvt->lock); + mutex_unlock(&vgpu->vgpu_lock); } /** @@ -255,14 +253,11 @@ void intel_gvt_destroy_vgpu(struct intel_vgpu *vgpu) { struct intel_gvt *gvt = vgpu->gvt; - mutex_lock(&gvt->lock); + mutex_lock(&vgpu->vgpu_lock); WARN(vgpu->active, "vGPU is still active!\n"); intel_gvt_debugfs_remove_vgpu(vgpu); - idr_remove(&gvt->vgpu_idr, vgpu->id); - if (idr_is_empty(&gvt->vgpu_idr)) - intel_gvt_clean_irq(gvt); intel_vgpu_clean_sched_policy(vgpu); intel_vgpu_clean_submission(vgpu); intel_vgpu_clean_display(vgpu); @@ -272,10 +267,16 @@ void intel_gvt_destroy_vgpu(struct intel_vgpu *vgpu) intel_vgpu_free_resource(vgpu); intel_vgpu_clean_mmio(vgpu); intel_vgpu_dmabuf_cleanup(vgpu); - vfree(vgpu); + mutex_unlock(&vgpu->vgpu_lock); + mutex_lock(&gvt->lock); + idr_remove(&gvt->vgpu_idr, vgpu->id); + if (idr_is_empty(&gvt->vgpu_idr)) + intel_gvt_clean_irq(gvt); intel_gvt_update_vgpu_types(gvt); mutex_unlock(&gvt->lock); + + vfree(vgpu); } #define IDLE_VGPU_IDR 0 @@ -301,6 +302,7 @@ struct intel_vgpu *intel_gvt_create_idle_vgpu(struct intel_gvt *gvt) vgpu->id = IDLE_VGPU_IDR; vgpu->gvt = gvt; + mutex_init(&vgpu->vgpu_lock); for (i = 0; i < I915_NUM_ENGINES; i++) INIT_LIST_HEAD(&vgpu->submission.workload_q_head[i]); @@ -327,7 +329,10 @@ out_free_vgpu: */ void intel_gvt_destroy_idle_vgpu(struct intel_vgpu *vgpu) { + mutex_lock(&vgpu->vgpu_lock); intel_vgpu_clean_sched_policy(vgpu); + mutex_unlock(&vgpu->vgpu_lock); + vfree(vgpu); } @@ -345,8 +350,6 @@ static struct intel_vgpu *__intel_gvt_create_vgpu(struct intel_gvt *gvt, if (!vgpu) return ERR_PTR(-ENOMEM); - mutex_lock(&gvt->lock); - ret = idr_alloc(&gvt->vgpu_idr, vgpu, IDLE_VGPU_IDR + 1, GVT_MAX_VGPU, GFP_KERNEL); if (ret < 0) @@ -356,6 +359,7 @@ static struct intel_vgpu *__intel_gvt_create_vgpu(struct intel_gvt *gvt, vgpu->handle = param->handle; vgpu->gvt = gvt; vgpu->sched_ctl.weight = param->weight; + mutex_init(&vgpu->vgpu_lock); INIT_LIST_HEAD(&vgpu->dmabuf_obj_list_head); INIT_RADIX_TREE(&vgpu->page_track_tree, GFP_KERNEL); idr_init(&vgpu->object_idr); @@ -403,8 +407,6 @@ static struct intel_vgpu *__intel_gvt_create_vgpu(struct intel_gvt *gvt, if (ret) goto out_clean_sched_policy; - mutex_unlock(&gvt->lock); - return vgpu; out_clean_sched_policy: @@ -427,7 +429,6 @@ out_clean_idr: idr_remove(&gvt->vgpu_idr, vgpu->id); out_free_vgpu: vfree(vgpu); - mutex_unlock(&gvt->lock); return ERR_PTR(ret); } @@ -459,12 +460,12 @@ struct intel_vgpu *intel_gvt_create_vgpu(struct intel_gvt *gvt, param.low_gm_sz = BYTES_TO_MB(param.low_gm_sz); param.high_gm_sz = BYTES_TO_MB(param.high_gm_sz); + mutex_lock(&gvt->lock); vgpu = __intel_gvt_create_vgpu(gvt, ¶m); - if (IS_ERR(vgpu)) - return vgpu; - - /* calculate left instance change for types */ - intel_gvt_update_vgpu_types(gvt); + if (!IS_ERR(vgpu)) + /* calculate left instance change for types */ + intel_gvt_update_vgpu_types(gvt); + mutex_unlock(&gvt->lock); return vgpu; } @@ -476,7 +477,7 @@ struct intel_vgpu *intel_gvt_create_vgpu(struct intel_gvt *gvt, * @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. + * device model reset or GT reset. The caller should hold the vgpu 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 @@ -516,9 +517,9 @@ void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr, * scheduler when the reset is triggered by current vgpu. */ if (scheduler->current_vgpu == NULL) { - mutex_unlock(&gvt->lock); + mutex_unlock(&vgpu->vgpu_lock); intel_gvt_wait_vgpu_idle(vgpu); - mutex_lock(&gvt->lock); + mutex_lock(&vgpu->vgpu_lock); } intel_vgpu_reset_submission(vgpu, resetting_eng); @@ -558,7 +559,7 @@ void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr, */ void intel_gvt_reset_vgpu(struct intel_vgpu *vgpu) { - mutex_lock(&vgpu->gvt->lock); + mutex_lock(&vgpu->vgpu_lock); intel_gvt_reset_vgpu_locked(vgpu, true, 0); - mutex_unlock(&vgpu->gvt->lock); + mutex_unlock(&vgpu->vgpu_lock); } |