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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
(cherry picked from commit 5298800984)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Xiaolin Zhang 2019-08-23 14:57:31 +08:00 committed by Rodrigo Vivi
parent 29326a167a
commit 9e77f5001b
3 changed files with 9 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -961,6 +961,7 @@ struct i915_frontbuffer_tracking {
};
struct i915_virtual_gpu {
struct mutex lock; /* serialises sending of g2v_notify command pkts */
bool active;
u32 caps;
};

12
drivers/gpu/drm/i915/i915_gem_gtt.c
View File

@ -827,10 +827,9 @@ 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;
@ -839,7 +838,9 @@ 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));
@ -859,9 +860,10 @@ 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] */

1
drivers/gpu/drm/i915/i915_vgpu.c
View File

@ -94,6 +94,7 @@ void i915_detect_vgpu(struct drm_i915_private *dev_priv)
dev_priv->vgpu.caps = readl(shared_area + vgtif_offset(vgt_caps));
dev_priv->vgpu.active = true;
mutex_init(&dev_priv->vgpu.lock);
DRM_INFO("Virtual GPU for Intel GVT-g detected.\n");
out: