diff options
| author | Xiaolin Zhang <xiaolin.zhang@intel.com> | 2019-08-23 14:57:31 +0800 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-08-24 12:12:34 +0100 |
| commit | 52988009843160c5b366b4082ed6df48041c655c (patch) | |
| tree | 4d50787dc149dae8b67a90835e7ce1d6cb391a11 /drivers/gpu/drm/i915/i915_gem_gtt.c | |
| parent | 75b974a859e5d9a3ceaa3aa03bbc27d404b32231 (diff) | |
drm/i915: to make vgpu ppgtt notificaiton as atomic operation
vgpu ppgtt notification was split into 2 steps, the first step is to
update PVINFO's pdp register and then write PVINFO's g2v_notify register
with action code to tirgger ppgtt notification to GVT side.
currently these steps were not atomic operations due to no any protection,
so it is easy to enter race condition state during the MTBF, stress and
IGT test to cause GPU hang.
the solution is to add a lock to make vgpu ppgtt notication as atomic
operation.
Cc: stable@vger.kernel.org
Signed-off-by: Xiaolin Zhang <xiaolin.zhang@intel.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/1566543451-13955-1-git-send-email-xiaolin.zhang@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_gtt.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_gtt.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index e0e9b9b52544..0db82921fb38 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -834,10 +834,9 @@ static void mark_tlbs_dirty(struct i915_ppgtt *ppgtt) ppgtt->pd_dirty_engines = ALL_ENGINES; } -static int gen8_ppgtt_notify_vgt(struct i915_ppgtt *ppgtt, bool create) +static void gen8_ppgtt_notify_vgt(struct i915_ppgtt *ppgtt, bool create) { - struct i915_address_space *vm = &ppgtt->vm; - struct drm_i915_private *dev_priv = vm->i915; + struct drm_i915_private *dev_priv = ppgtt->vm.i915; enum vgt_g2v_type msg; int i; @@ -846,7 +845,9 @@ static int gen8_ppgtt_notify_vgt(struct i915_ppgtt *ppgtt, bool create) else atomic_dec(px_used(ppgtt->pd)); - if (i915_vm_is_4lvl(vm)) { + mutex_lock(&dev_priv->vgpu.lock); + + if (i915_vm_is_4lvl(&ppgtt->vm)) { const u64 daddr = px_dma(ppgtt->pd); I915_WRITE(vgtif_reg(pdp[0].lo), lower_32_bits(daddr)); @@ -866,9 +867,10 @@ static int gen8_ppgtt_notify_vgt(struct i915_ppgtt *ppgtt, bool create) VGT_G2V_PPGTT_L3_PAGE_TABLE_DESTROY); } + /* g2v_notify atomically (via hv trap) consumes the message packet. */ I915_WRITE(vgtif_reg(g2v_notify), msg); - return 0; + mutex_unlock(&dev_priv->vgpu.lock); } /* Index shifts into the pagetable are offset by GEN8_PTE_SHIFT [12] */ |