Let GVT-g VM read the CSB and CSB write pointer from virtual HWSP, not all
the host support this feature, need to check the BIT(3) of caps in PVINFO.
Signed-off-by: Weinan Li <weinan.z...@intel.com>
Cc: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_vgpu.c | 5 +++++
drivers/gpu/drm/i915/i915_vgpu.h | 1 +
drivers/gpu/drm/i915/intel_lrc.c | 18 +++++++++++++-----
3 files changed, 19 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_vgpu.c b/drivers/gpu/drm/i915/i915_vgpu.c
index 5fe9f3f..6f713c5 100644
--- a/drivers/gpu/drm/i915/i915_vgpu.c
+++ b/drivers/gpu/drm/i915/i915_vgpu.c
@@ -86,6 +86,11 @@ bool intel_vgpu_has_full_48bit_ppgtt(struct drm_i915_private
*dev_priv)
return dev_priv->vgpu.caps & VGT_CAPS_FULL_48BIT_PPGTT;
}
+bool intel_vgpu_has_hwsp_emulation(struct drm_i915_private *dev_priv)
+{
+ return dev_priv->vgpu.caps & VGT_CAPS_HWSP_EMULATION;
+}
+
struct _balloon_info_ {
/*
* There are up to 2 regions per mappable/unmappable graphic
diff --git a/drivers/gpu/drm/i915/i915_vgpu.h b/drivers/gpu/drm/i915/i915_vgpu.h
index b72bd29..cec0ec1 100644
--- a/drivers/gpu/drm/i915/i915_vgpu.h
+++ b/drivers/gpu/drm/i915/i915_vgpu.h
@@ -29,6 +29,7 @@
void i915_check_vgpu(struct drm_i915_private *dev_priv);
bool intel_vgpu_has_full_48bit_ppgtt(struct drm_i915_private *dev_priv);
+bool intel_vgpu_has_hwsp_emulation(struct drm_i915_private *dev_priv);
int intel_vgt_balloon(struct drm_i915_private *dev_priv);
void intel_vgt_deballoon(struct drm_i915_private *dev_priv);
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 955c879..cd2af7b 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -136,6 +136,7 @@
#include <drm/drmP.h>
#include <drm/i915_drm.h>
#include "i915_drv.h"
+#include "i915_vgpu.h"
#include "intel_mocs.h"
#define RING_EXECLIST_QFULL (1 << 0x2)
@@ -664,7 +665,12 @@ static void intel_lrc_irq_handler(unsigned long data)
&engine->status_page.page_addr[I915_HWS_CSB_BUF0_INDEX];
unsigned int head, tail;
- /* However GVT emulation depends upon intercepting CSB mmio */
+ /* However GVT-g emulation depends upon host kernel
+ * implementation, need to check support capbility by reading PV
+ * INFO before access HWSP. Beside from this, another special
+ * configuration may also need to force use mmio, like IOMMU
+ * enabled.
+ */
if (unlikely(engine->csb_use_mmio)) {
buf = (u32 * __force)
(dev_priv->regs +
i915_mmio_reg_offset(RING_CONTEXT_STATUS_BUF_LO(engine, 0)));
@@ -1780,10 +1786,6 @@ static void execlists_set_default_submission(struct
intel_engine_cs *engine)
static bool irq_handler_force_mmio(struct drm_i915_private *i915)
{
- /* GVT emulation depends upon intercepting CSB mmio */
- if (intel_vgpu_active(i915))
- return true;
-
/*
* IOMMU adds unpredictable latency causing the CSB write (from the
* GPU into the HWSP) to only be visible some time after the interrupt
@@ -1792,6 +1794,12 @@ static bool irq_handler_force_mmio(struct
drm_i915_private *i915)
if (intel_vtd_active())
return true;
+ /* GVT emulation depends upon host kernel implementation, check
+ * support capbility by reading PV INFO before access HWSP.
+ */
+ if (intel_vgpu_active(i915) && !intel_vgpu_has_hwsp_emulation(i915))
+ return true;
+
return false;
}
--
1.9.1
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