[PATCH v1 01/12] drm/i915: introduced vgpu pv capability
Xiaolin Zhang
xiaolin.zhang at intel.com
Fri Sep 4 16:21:34 UTC 2020
to enable vgpu pv feature, pv capability is introduced for guest by
new pv_caps member in struct i915_virtual_gpu and for host GVT by
new pv_caps register in struct vgt_if.
both of them are used to control different pv feature support in each
domain and the final pv caps runtime negotiated between guest and host.
it also adds VGT_CAPS_PV capability BIT useb by guest to query host GVTg
whether support any PV feature or not.
Signed-off-by: Xiaolin Zhang <xiaolin.zhang at intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 3 ++
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/i915_pvinfo.h | 5 ++-
drivers/gpu/drm/i915/i915_vgpu.c | 63 ++++++++++++++++++++++++++++++++++++-
drivers/gpu/drm/i915/i915_vgpu.h | 10 ++++++
5 files changed, 80 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 7842199..fd1e0fc 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -48,6 +48,7 @@
#include "i915_trace.h"
#include "intel_pm.h"
#include "intel_sideband.h"
+#include "i915_vgpu.h"
static inline struct drm_i915_private *node_to_i915(struct drm_info_node *node)
{
@@ -60,6 +61,8 @@ static int i915_capabilities(struct seq_file *m, void *data)
struct drm_printer p = drm_seq_file_printer(m);
seq_printf(m, "pch: %d\n", INTEL_PCH_TYPE(i915));
+ if (intel_vgpu_active(i915))
+ seq_printf(m, "vgpu pv_caps: 0x%x\n", i915->vgpu.pv_caps);
intel_device_info_print_static(INTEL_INFO(i915), &p);
intel_device_info_print_runtime(RUNTIME_INFO(i915), &p);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index a455752..16d1b51 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -808,6 +808,7 @@ struct i915_virtual_gpu {
struct mutex lock; /* serialises sending of g2v_notify command pkts */
bool active;
u32 caps;
+ u32 pv_caps;
};
struct intel_cdclk_config {
diff --git a/drivers/gpu/drm/i915/i915_pvinfo.h b/drivers/gpu/drm/i915/i915_pvinfo.h
index 683e97a..8b0dc25 100644
--- a/drivers/gpu/drm/i915/i915_pvinfo.h
+++ b/drivers/gpu/drm/i915/i915_pvinfo.h
@@ -57,6 +57,7 @@ enum vgt_g2v_type {
#define VGT_CAPS_FULL_PPGTT BIT(2)
#define VGT_CAPS_HWSP_EMULATION BIT(3)
#define VGT_CAPS_HUGE_GTT BIT(4)
+#define VGT_CAPS_PV BIT(5)
struct vgt_if {
u64 magic; /* VGT_MAGIC */
@@ -109,7 +110,9 @@ struct vgt_if {
u32 execlist_context_descriptor_lo;
u32 execlist_context_descriptor_hi;
- u32 rsv7[0x200 - 24]; /* pad to one page */
+ u32 pv_caps;
+
+ u32 rsv7[0x200 - 25]; /* pad to one page */
} __packed;
#define vgtif_offset(x) (offsetof(struct vgt_if, x))
diff --git a/drivers/gpu/drm/i915/i915_vgpu.c b/drivers/gpu/drm/i915/i915_vgpu.c
index 70fca72..10960125 100644
--- a/drivers/gpu/drm/i915/i915_vgpu.c
+++ b/drivers/gpu/drm/i915/i915_vgpu.c
@@ -98,7 +98,13 @@ void intel_vgpu_detect(struct drm_i915_private *dev_priv)
dev_priv->vgpu.active = true;
mutex_init(&dev_priv->vgpu.lock);
- drm_info(&dev_priv->drm, "Virtual GPU for Intel GVT-g detected.\n");
+
+ if (!intel_vgpu_detect_pv_caps(dev_priv, shared_area)) {
+ DRM_INFO("Virtual GPU for Intel GVT-g detected.\n");
+ goto out;
+ }
+
+ DRM_INFO("Virtual GPU for Intel GVT-g detected with PV Optimized.\n");
out:
pci_iounmap(pdev, shared_area);
@@ -134,6 +140,18 @@ bool intel_vgpu_has_huge_gtt(struct drm_i915_private *dev_priv)
return dev_priv->vgpu.caps & VGT_CAPS_HUGE_GTT;
}
+static bool intel_vgpu_check_pv_cap(struct drm_i915_private *dev_priv,
+ enum pv_caps cap)
+{
+ return (dev_priv->vgpu.active && (dev_priv->vgpu.caps & VGT_CAPS_PV)
+ && (dev_priv->vgpu.pv_caps & cap));
+}
+
+static bool intel_vgpu_has_pv_caps(struct drm_i915_private *dev_priv)
+{
+ return dev_priv->vgpu.caps & VGT_CAPS_PV;
+}
+
struct _balloon_info_ {
/*
* There are up to 2 regions per mappable/unmappable graphic
@@ -336,3 +354,46 @@ int intel_vgt_balloon(struct i915_ggtt *ggtt)
drm_err(&dev_priv->drm, "VGT balloon fail\n");
return ret;
}
+
+/*
+ * i915 vgpu PV support for Linux
+ */
+
+/*
+ * Config vgpu PV ops for different PV capabilities
+ */
+void intel_vgpu_config_pv_caps(struct drm_i915_private *i915,
+ enum pv_caps cap, void *data)
+{
+
+ if (!intel_vgpu_check_pv_cap(i915, cap))
+ return;
+}
+
+/**
+ * intel_vgpu_detect_pv_caps - detect virtual GPU PV capabilities
+ * @dev_priv: i915 device private
+ *
+ * This function is called at the initialization stage, to detect VGPU
+ * PV capabilities
+ */
+bool intel_vgpu_detect_pv_caps(struct drm_i915_private *i915,
+ void __iomem *shared_area)
+{
+ u32 gvt_pvcaps;
+ u32 pvcaps = 0;
+
+ if (!intel_vgpu_has_pv_caps(i915))
+ return false;
+
+ /* PV capability negotiation between PV guest and GVT */
+ gvt_pvcaps = readl(shared_area + vgtif_offset(pv_caps));
+ pvcaps = i915->vgpu.pv_caps & gvt_pvcaps;
+ i915->vgpu.pv_caps = pvcaps;
+ writel(pvcaps, shared_area + vgtif_offset(pv_caps));
+
+ if (!pvcaps)
+ return false;
+
+ return true;
+}
diff --git a/drivers/gpu/drm/i915/i915_vgpu.h b/drivers/gpu/drm/i915/i915_vgpu.h
index ffbb77d..1b10175 100644
--- a/drivers/gpu/drm/i915/i915_vgpu.h
+++ b/drivers/gpu/drm/i915/i915_vgpu.h
@@ -29,6 +29,11 @@
struct drm_i915_private;
struct i915_ggtt;
+/* define different PV capabilities */
+enum pv_caps {
+ PV_NONE = 0,
+};
+
void intel_vgpu_detect(struct drm_i915_private *i915);
bool intel_vgpu_active(struct drm_i915_private *i915);
void intel_vgpu_register(struct drm_i915_private *i915);
@@ -39,4 +44,9 @@ bool intel_vgpu_has_huge_gtt(struct drm_i915_private *i915);
int intel_vgt_balloon(struct i915_ggtt *ggtt);
void intel_vgt_deballoon(struct i915_ggtt *ggtt);
+/* i915 vgpu pv related functions */
+bool intel_vgpu_detect_pv_caps(struct drm_i915_private *i915,
+ void __iomem *shared_area);
+void intel_vgpu_config_pv_caps(struct drm_i915_private *i915,
+ enum pv_caps cap, void *data);
#endif /* _I915_VGPU_H_ */
--
2.7.4
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