From aff6f917d094df0ba0fb4182f6b707bfbc2c0884 Mon Sep 17 00:00:00 2001
From: Tina Zhang <tina.zhang@intel.com>
Date: Tue, 25 Feb 2020 13:35:26 +0800
Subject: drm/i915/gvt: Fix drm_WARN issue where vgpu ptr is unavailable
Git-commit: a8bb49b64c4f4284fb36169bdd9fc6efd62eb26a
Patch-mainline: v5.7-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322
When vgpu ptr is unavailable, the drm_WARN* can hang the whole system
due to the drm pointer is NULL. This patch fixes this issue by using
WARN directly which won't care about the drm pointer.
Fixes: 12d5861973c70 ("drm/i915/gvt: Make WARN* drm specific where vgpu ptr is available")
Signed-off-by: Tina Zhang <tina.zhang@intel.com>
Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200225053527.8336-1-tina.zhang@intel.com
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/i915/gvt/mmio_context.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/gvt/mmio_context.c b/drivers/gpu/drm/i915/gvt/mmio_context.c
index 46c291e4926b..1213c8e23317 100644
--- a/drivers/gpu/drm/i915/gvt/mmio_context.c
+++ b/drivers/gpu/drm/i915/gvt/mmio_context.c
@@ -392,7 +392,6 @@ static void handle_tlb_pending_event(struct intel_vgpu *vgpu, int ring_id)
static void switch_mocs(struct intel_vgpu *pre, struct intel_vgpu *next,
int ring_id)
{
- struct drm_i915_private *i915 = pre->gvt->dev_priv;
struct drm_i915_private *dev_priv;
i915_reg_t offset, l3_offset;
u32 old_v, new_v;
@@ -407,7 +406,7 @@ static void switch_mocs(struct intel_vgpu *pre, struct intel_vgpu *next,
int i;
dev_priv = pre ? pre->gvt->dev_priv : next->gvt->dev_priv;
- if (drm_WARN_ON(&i915->drm, ring_id >= ARRAY_SIZE(regs)))
+ if (drm_WARN_ON(&dev_priv->drm, ring_id >= ARRAY_SIZE(regs)))
return;
if (ring_id == RCS0 && IS_GEN(dev_priv, 9))
@@ -552,10 +551,9 @@ static void switch_mmio(struct intel_vgpu *pre,
void intel_gvt_switch_mmio(struct intel_vgpu *pre,
struct intel_vgpu *next, int ring_id)
{
- struct drm_i915_private *i915 = pre->gvt->dev_priv;
struct drm_i915_private *dev_priv;
- if (drm_WARN_ON(&i915->drm, !pre && !next))
+ if (WARN(!pre && !next, "switch ring %d from host to HOST\n", ring_id))
return;
gvt_dbg_render("switch ring %d from %s to %s\n", ring_id,
--
2.28.0