leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

drm/i915/gvt: force to set all context control bits from guest

Browse Source 
Our shadow context content is from guest but with masked control reg like
CTX_CONTEXT_CONTROL, we need to make sure all settings from guest would be set
when this context is on hw, this trys to force mask enable bits for all to
ensure every bits setting would be effective on hw.

One regression found related to once inhibit bit is set, gpu engine are working
on inhibit state until MI_LOAD_REG_IMM command or context image clear inhibit
bit with mask bit set to 1, and val bit set to 0. In gvt-g currently workload
has the highest priority, so gvt-g workload could trigger preempt context
easily, preempt context set inhibit bit, then gvt-g workload is scheduled in,
but gvt-g workload shadow context image usually doesn't set inhibit mask bit,
so gpu is still in inhibit state when gvt workload is running. This caused gpu
hang.

Suggested-by: Zhang, Xiong <xiong.y.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Reviewed-by: Zhang, Xiong <xiong.y.zhang@intel.com>
This commit is contained in:
Zhenyu Wang 2018-03-19 17:09:05 +08:00
parent b20c0d5ce1
commit d830307569
1 changed files with 8 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/gpu/drm/i915/gvt/scheduler.c
View File

@ -124,8 +124,14 @@ static int populate_shadow_context(struct intel_vgpu_workload *workload)
#define COPY_REG(name) \
intel_gvt_hypervisor_read_gpa(vgpu, workload->ring_context_gpa \
+ RING_CTX_OFF(name.val), &shadow_ring_context->name.val, 4)
#define COPY_REG_MASKED(name) {\
intel_gvt_hypervisor_read_gpa(vgpu, workload->ring_context_gpa \
+ RING_CTX_OFF(name.val),\
&shadow_ring_context->name.val, 4);\
shadow_ring_context->name.val |= 0xffff << 16;\
}
COPY_REG(ctx_ctrl);
COPY_REG_MASKED(ctx_ctrl);
COPY_REG(ctx_timestamp);
if (ring_id == RCS) {
@ -134,6 +140,7 @@ static int populate_shadow_context(struct intel_vgpu_workload *workload)
COPY_REG(rcs_indirect_ctx_offset);
}
#undef COPY_REG
#undef COPY_REG_MASKED
intel_gvt_hypervisor_read_gpa(vgpu,
workload->ring_context_gpa +