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drm/i915/gvt: update vreg on inhibit context lri command

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Commit cd7e 61b9"init mmio by lri command in vgpu inhibit context"
initializes registers saved/restored in context with its vreg value
through lri command in ring buffer. It relies on vreg got updated
on every guest access. There is a case found that Linux guest uses
lri command in inhibit-ctx to update the register. This patch adds
vreg update on this case.

v2: move mmio_attribute functions to gvt.h (Zhenyu)
v3: use mask_mmio_write in vreg update
v4: refine codes and add more comments (Zhenyu)

Fixes: cd7e61b9("drm/i915/gvt: init mmio by lri command in vgpu inhibit context")
Signed-off-by: Hang Yuan <hang.yuan@linux.intel.com>
Signed-off-by: Weinan Li <weinan.z.li@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Hang Yuan
2018-07-03 17:31:17 +08:00
committed by Zhenyu Wang
parent a4cae23cc0
commit 6cef21a196
5 changed files with 81 additions and 1 deletions
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24
drivers/gpu/drm/i915/gvt/handlers.c
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@@ -3045,6 +3045,30 @@ int intel_vgpu_default_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
return 0;
}
/**
* intel_vgpu_mask_mmio_write - write mask register
* @vgpu: a vGPU
* @offset: access offset
* @p_data: write data buffer
* @bytes: access data length
*
* Returns:
* Zero on success, negative error code if failed.
*/
int intel_vgpu_mask_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
void *p_data, unsigned int bytes)
{
u32 mask, old_vreg;
old_vreg = vgpu_vreg(vgpu, offset);
write_vreg(vgpu, offset, p_data, bytes);
mask = vgpu_vreg(vgpu, offset) >> 16;
vgpu_vreg(vgpu, offset) = (old_vreg & ~mask) |
(vgpu_vreg(vgpu, offset) & mask);
return 0;
}
/**
* intel_gvt_in_force_nonpriv_whitelist - if a mmio is in whitelist to be
* force-nopriv register