[PATCH v6 3/9] drm/i915: gvt: Introduce the basic architecture of GVT-g

Zhi Wang
2016-06-02T16:39:14Z

This patch introduces the very basic framework of GVT-g device model,
includes basic prototypes, definitions, initialization.

v6:
- Refine introduction in Kconfig. (Chris)
- The exposed API functions will take struct intel_gvt * instead of
void *. (Chris/Tvrtko)
- Remove most memebers of strct intel_gvt_device_info. Will add them
in the device model patches.(Chris)
- Remove gvt_info() and gvt_err() in debug.h. (Chris)
- Move GVT kernel parameter into i915_params. (Chris)
- Remove include/drm/i915_gvt.h, as GVT-g will be built within i915.
- Remove the redundant struct i915_gvt *, as the functions in i915
will directly take struct intel_gvt *.
- Add more comments for reviewer.

v5:
Take Tvrtko's comments:
- Fix the misspelled words in Kconfig
- Let functions take drm_i915_private * instead of struct drm_device *
- Remove redundant prints/local varible initialization

v3:
Take Joonas' comments:
- Change file name i915_gvt.* to intel_gvt.*
- Move GVT kernel parameter into intel_gvt.c
- Remove redundant debug macros
- Change error handling style
- Add introductions for some stub functions
- Introduce drm/i915_gvt.h.

Take Kevin's comments:
- Move GVT-g host/guest check into intel_vgt_balloon in i915_gem_gtt.c

v2:
- Introduce i915_gvt.c.
It's necessary to introduce the stubs between i915 driver and GVT-g host,
as GVT-g components is configurable in kernel config. When disabled, the
stubs here do nothing.

Take Joonas' comments:
- Replace boolean return value with int.
- Replace customized info/warn/debug macros with DRM macros.
- Document all non-static functions like i915.
- Remove empty and unused functions.
- Replace magic number with marcos.
- Set GVT-g in kernel config to "n" by default.

Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
---
drivers/gpu/drm/i915/Kconfig | 19 ++++
drivers/gpu/drm/i915/Makefile | 5 +
drivers/gpu/drm/i915/gvt/Makefile | 5 +
drivers/gpu/drm/i915/gvt/debug.h | 34 +++++++
drivers/gpu/drm/i915/gvt/gvt.c | 181 +++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/gvt/gvt.h | 75 +++++++++++++++
drivers/gpu/drm/i915/gvt/hypercall.h | 38 ++++++++
drivers/gpu/drm/i915/gvt/mpt.h | 49 ++++++++++
drivers/gpu/drm/i915/i915_dma.c | 17 +++-
drivers/gpu/drm/i915/i915_drv.h | 10 ++
drivers/gpu/drm/i915/i915_params.c | 5 +
drivers/gpu/drm/i915/i915_params.h | 1 +
drivers/gpu/drm/i915/intel_gvt.c | 90 +++++++++++++++++
drivers/gpu/drm/i915/intel_gvt.h | 46 +++++++++
14 files changed, 571 insertions(+), 4 deletions(-)
create mode 100644 drivers/gpu/drm/i915/gvt/Makefile
create mode 100644 drivers/gpu/drm/i915/gvt/debug.h
create mode 100644 drivers/gpu/drm/i915/gvt/gvt.c
create mode 100644 drivers/gpu/drm/i915/gvt/gvt.h
create mode 100644 drivers/gpu/drm/i915/gvt/hypercall.h
create mode 100644 drivers/gpu/drm/i915/gvt/mpt.h
create mode 100644 drivers/gpu/drm/i915/intel_gvt.c
create mode 100644 drivers/gpu/drm/i915/intel_gvt.h

diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index 29a32b1..e4fd9da 100644
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -57,6 +57,25 @@ config DRM_I915_USERPTR

If in doubt, say "Y".

+config DRM_I915_GVT
+ bool "Enable Intel GVT-g graphics virtualization host support"
+ depends on DRM_I915
+ default n
+ help
+ Choose this option if you want to enable Intel GVT-g graphics
+ virtualization technology host support with integrated graphics.
+ With GVT-g, it's possible to have one integrated graphics
+ device shared by multiple VMs under different hypervisors.
+
+ Note that at least one hypervisor like Xen or KVM is required for
+ this driver to work, and it only supports newer device from
+ Broadwell+. For further information and setup guide, you can
+ visit: http://01.org/zh/igvt-g.
+
+ The first version is still preliminary. Use it under you own risk.
+
+ If in doubt, say "N".
+
menu "drm/i915 Debugging"
depends on DRM_I915
depends on EXPERT
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 7e29444..276abf1 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -104,6 +104,11 @@ i915-y += i915_vgpu.o
# legacy horrors
i915-y += i915_dma.o

+ifeq ($(CONFIG_DRM_I915_GVT),y)
+i915-y += intel_gvt.o
+include $(src)/gvt/Makefile
+endif
+
obj-$(CONFIG_DRM_I915) += i915.o

CFLAGS_i915_trace_points.o := -I$(src)
diff --git a/drivers/gpu/drm/i915/gvt/Makefile b/drivers/gpu/drm/i915/gvt/Makefile
new file mode 100644
index 0000000..d0f21a6
--- /dev/null
+++ b/drivers/gpu/drm/i915/gvt/Makefile
@@ -0,0 +1,5 @@
+GVT_DIR := gvt
+GVT_SOURCE := gvt.o
+
+ccflags-y += -I$(src) -I$(src)/$(GVT_DIR) -Wall
+i915-y += $(addprefix $(GVT_DIR)/, $(GVT_SOURCE))
diff --git a/drivers/gpu/drm/i915/gvt/debug.h b/drivers/gpu/drm/i915/gvt/debug.h
new file mode 100644
index 0000000..7ef412b
--- /dev/null
+++ b/drivers/gpu/drm/i915/gvt/debug.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef __GVT_DEBUG_H__
+#define __GVT_DEBUG_H__
+
+#define gvt_dbg_core(fmt, args...) \
+ DRM_DEBUG_DRIVER("gvt: core: "fmt, ##args)
+
+/*
+ * Other GVT debug stuff will be introduced in the GVT device model patches.
+ */
+
+#endif
diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
new file mode 100644
index 0000000..9f1d3e7
--- /dev/null
+++ b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -0,0 +1,181 @@
+/*
+ * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/types.h>
+#include <xen/xen.h>
+#include <linux/kthread.h>
+
+#include "gvt.h"
+
+struct intel_gvt_host intel_gvt_host;
+
+static const char * const supported_hypervisors[] = {
+ [INTEL_GVT_HYPERVISOR_XEN] = "XEN",
+ [INTEL_GVT_HYPERVISOR_KVM] = "KVM",
+};
+
+#define MB(x) (x * 1024ULL * 1024ULL)
+#define GB(x) (x * MB(1024))
+
+/* Load MPT modules and detect if we're running in host */
+static int init_gvt_host(void)
+{
+ if (intel_gvt_host.initialized)
+ return 0;
+
+ /* Xen DOM U */
+ if (xen_domain() && !xen_initial_domain())
+ return -ENODEV;
+
+ /* Try to load MPT modules for hypervisors */
+ if (xen_initial_domain()) {
+ /* In Xen dom0 */
+ intel_gvt_host.mpt = try_then_request_module(
+ symbol_get(xengt_mpt), "xengt");
+ intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_XEN;
+ } else {
+ /* not in Xen. Try KVMGT */
+ intel_gvt_host.mpt = try_then_request_module(
+ symbol_get(kvmgt_mpt), "kvm");
+ intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_KVM;
+ }
+
+ /* Fail to load MPT modules - bail out */
+ if (!intel_gvt_host.mpt)
+ return -EINVAL;
+
+ /* Try to detect if we're running in host instead of VM. */
+ if (!intel_gvt_hypervisor_detect_host())
+ return -ENODEV;
+
+ gvt_dbg_core("Running with hypervisor %s in host mode\n",
+ supported_hypervisors[intel_gvt_host.hypervisor_type]);
+
+ idr_init(&intel_gvt_host.gvt_idr);
+ mutex_init(&intel_gvt_host.gvt_idr_lock);
+ intel_gvt_host.initialized = true;
+ return 0;
+}
+
+static void init_device_info(struct intel_gvt *gvt)
+{
+ if (IS_BROADWELL(gvt->dev_priv))
+ gvt->device_info.max_support_vgpus = 8;
+ /* This function will grow large in GVT device model patches. */
+}
+
+static void free_gvt_device(struct intel_gvt *gvt)
+{
+ mutex_lock(&intel_gvt_host.gvt_idr_lock);
+ idr_remove(&intel_gvt_host.gvt_idr, gvt->id);
+ mutex_unlock(&intel_gvt_host.gvt_idr_lock);
+
+ vfree(gvt);
+}
+
+static struct intel_gvt *alloc_gvt_device(struct drm_i915_private *dev_priv)
+{
+ struct intel_gvt *gvt;
+ int ret;
+
+ /*
+ * This data structure will grow large in future, use vzalloc() at
+ * the beginning.
+ */
+ gvt = vzalloc(sizeof(*gvt));
+ if (!gvt)
+ return ERR_PTR(-ENOMEM);
+
+ mutex_lock(&intel_gvt_host.gvt_idr_lock);
+ ret = idr_alloc(&intel_gvt_host.gvt_idr, gvt, 0, 0, GFP_KERNEL);
+ mutex_unlock(&intel_gvt_host.gvt_idr_lock);
+
+ if (ret < 0)
+ goto err;
+
+ gvt->id = ret;
+ mutex_init(&gvt->lock);
+ gvt->dev_priv = dev_priv;
+ idr_init(&gvt->vgpu_idr);
+
+ return gvt;
+err:
+ free_gvt_device(gvt);
+ return ERR_PTR(ret);
+}
+
+/**
+ * intel_gvt_destroy_device - destroy a GVT device
+ * @gvt: intel gvt device
+ *
+ * This function is called at the driver unloading stage, to destroy a
+ * GVT device and free the related resources.
+ *
+ */
+void intel_gvt_destroy_device(struct intel_gvt *gvt)
+{
+ /* Another de-initialization of GVT components will be introduced. */
+ free_gvt_device(gvt);
+}
+
+/**
+ * intel_gvt_create_device - create a GVT device
+ * @dev_priv: drm i915 private data
+ *
+ * This function is called at the initialization stage, to create a
+ * GVT device and initialize necessary GVT components for it.
+ *
+ * Returns:
+ * pointer to the intel gvt device structure, error pointer if failed.
+ *
+ */
+struct intel_gvt *intel_gvt_create_device(struct drm_i915_private *dev_priv)
+{
+ struct intel_gvt *gvt;
+ int ret;
+
+ ret = init_gvt_host();
+ if (ret)
+ return ERR_PTR(ret);
+
+ gvt_dbg_core("create new gvt device\n");
+
+ gvt = alloc_gvt_device(dev_priv);
+ if (IS_ERR(gvt)) {
+ ret = PTR_ERR(gvt);
+ goto out_err;
+ }
+
+ gvt_dbg_core("init gvt device, id %d\n", gvt->id);
+
+ init_device_info(gvt);
+ /*
+ * Other initialization of GVT components will be called here.
+ */
+ gvt_dbg_core("gvt device creation is done, id %d\n", gvt->id);
+
+ return gvt;
+
+out_err:
+ return ERR_PTR(ret);
+}
diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
new file mode 100644
index 0000000..f021487
--- /dev/null
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef _GVT_H_
+#define _GVT_H_
+
+#include "i915_drv.h"
+#include "i915_pvinfo.h"
+
+#include "debug.h"
+#include "hypercall.h"
+
+#define GVT_MAX_VGPU 8
+#define GVT_ALIGN(addr, size) ((addr) & (~((typeof(addr))(size) - 1)))
+
+enum {
+ INTEL_GVT_HYPERVISOR_XEN = 0,
+ INTEL_GVT_HYPERVISOR_KVM,
+};
+
+struct intel_gvt_host {
+ bool initialized;
+ int hypervisor_type;
+ struct mutex gvt_idr_lock;
+ struct idr gvt_idr;
+ struct intel_gvt_mpt *mpt;
+};
+
+extern struct intel_gvt_host intel_gvt_host;
+
+/* Describe per-platform limitations. */
+struct intel_gvt_device_info {
+ u32 max_support_vgpus;
+ /* This data structure will grow bigger in GVT device model patches */
+};
+
+struct intel_vgpu {
+ struct intel_gvt *gvt;
+ int id;
+ unsigned long handle; /* vGPU handle used by hypervisor MPT modules */
+};
+
+struct intel_gvt {
+ struct mutex lock;
+ int id;
+
+ struct drm_i915_private *dev_priv;
+ struct idr vgpu_idr; /* vGPU IDR pool */
+
+ struct intel_gvt_device_info device_info;
+};
+
+#include "mpt.h"
+
+#endif
diff --git a/drivers/gpu/drm/i915/gvt/hypercall.h b/drivers/gpu/drm/i915/gvt/hypercall.h
new file mode 100644
index 0000000..254df8b
--- /dev/null
+++ b/drivers/gpu/drm/i915/gvt/hypercall.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef _GVT_HYPERCALL_H_
+#define _GVT_HYPERCALL_H_
+
+/*
+ * Specific GVT-g MPT modules function collections. Currently GVT-g supports
+ * both Xen and KVM by providing dedicated hypervisor-related MPT modules.
+ */
+struct intel_gvt_mpt {
+ int (*detect_host)(void);
+};
+
+extern struct intel_gvt_mpt xengt_mpt;
+extern struct intel_gvt_mpt kvmgt_mpt;
+
+#endif /* _GVT_HYPERCALL_H_ */
diff --git a/drivers/gpu/drm/i915/gvt/mpt.h b/drivers/gpu/drm/i915/gvt/mpt.h
new file mode 100644
index 0000000..783f4f8
--- /dev/null
+++ b/drivers/gpu/drm/i915/gvt/mpt.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef _GVT_MPT_H_
+#define _GVT_MPT_H_
+
+/**
+ * DOC: Hypervisor Service APIs for GVT-g Core Logic
+ *
+ * This is the glue layer between specific hypervisor MPT modules and GVT-g core
+ * logic. Each kind of hypervisor MPT module provides a collection of function
+ * callbacks via gvt_kernel_dm and will be attached to GVT host when driver
+ * loading. GVT-g core logic will call these APIs to request specific services
+ * from hypervisor.
+ */
+
+/**
+ * intel_gvt_hypervisor_detect_host - check if GVT-g is running within
+ * hypervisor host/privilged domain
+ *
+ * Returns:
+ * Zero on success, -ENODEV if current kernel is running inside a VM
+ */
+static inline int intel_gvt_hypervisor_detect_host(void)
+{
+ return intel_gvt_host.mpt->detect_host();
+}
+
+#endif /* _GVT_MPT_H_ */
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 07edaed..0baf64a 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -35,6 +35,7 @@
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"
+#include "intel_gvt.h"
#include "i915_vgpu.h"
#include "i915_trace.h"
#include <linux/pci.h>
@@ -1244,18 +1245,22 @@ static int i915_driver_init_hw(struct drm_i915_private *dev_priv)
goto out_ggtt;
}

+ ret = intel_gvt_init(dev_priv);
+ if (ret)
+ goto out_ggtt;
+
/* WARNING: Apparently we must kick fbdev drivers before vgacon,
* otherwise the vga fbdev driver falls over. */
ret = i915_kick_out_firmware_fb(dev_priv);
if (ret) {
DRM_ERROR("failed to remove conflicting framebuffer drivers\n");
- goto out_ggtt;
+ goto out_gvt;
}

ret = i915_kick_out_vgacon(dev_priv);
if (ret) {
DRM_ERROR("failed to remove conflicting VGA console\n");
- goto out_ggtt;
+ goto out_gvt;
}

pci_set_master(dev->pdev);
@@ -1266,7 +1271,7 @@ static int i915_driver_init_hw(struct drm_i915_private *dev_priv)
if (ret) {
DRM_ERROR("failed to set DMA mask\n");

- goto out_ggtt;
+ goto out_gvt;
}
}

@@ -1296,7 +1301,7 @@ static int i915_driver_init_hw(struct drm_i915_private *dev_priv)
aperture_size);
if (!ggtt->mappable) {
ret = -EIO;
- goto out_ggtt;
+ goto out_gvt;
}

ggtt->mtrr = arch_phys_wc_add(ggtt->mappable_base,
@@ -1329,6 +1334,8 @@ static int i915_driver_init_hw(struct drm_i915_private *dev_priv)

return 0;

+out_gvt:
+ intel_gvt_cleanup(dev_priv);
out_ggtt:
i915_ggtt_cleanup_hw(dev);

@@ -1487,6 +1494,8 @@ int i915_driver_unload(struct drm_device *dev)

intel_fbdev_fini(dev);

+ intel_gvt_cleanup(dev_priv);
+
ret = i915_gem_suspend(dev);
if (ret) {
DRM_ERROR("failed to idle hardware: %d\n", ret);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index e4c8e34..bdf499f 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -61,6 +61,8 @@
#include "i915_gem_gtt.h"
#include "i915_gem_render_state.h"

+#include "intel_gvt.h"
+
/* General customization:
*/

@@ -1737,6 +1739,8 @@ struct drm_i915_private {

struct i915_virtual_gpu vgpu;

+ struct intel_gvt *gvt;
+
struct intel_guc guc;

struct intel_csr csr;
@@ -2938,6 +2942,12 @@ void intel_uncore_forcewake_put__locked(struct drm_i915_private *dev_priv,
u64 intel_uncore_edram_size(struct drm_i915_private *dev_priv);

void assert_forcewakes_inactive(struct drm_i915_private *dev_priv);
+
+static inline bool intel_gvt_active(struct drm_i915_private *dev_priv)
+{
+ return dev_priv->gvt ? true : false;
+}
+
static inline bool intel_vgpu_active(struct drm_i915_private *dev_priv)
{
return dev_priv->vgpu.active;
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 5e18cf9..c9615ce 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -60,6 +60,7 @@ struct i915_params i915 __read_mostly = {
.enable_dp_mst = true,
.inject_load_failure = 0,
.enable_dpcd_backlight = false,
+ .enable_gvt = false,
};

module_param_named(modeset, i915.modeset, int, 0400);
@@ -222,3 +223,7 @@ MODULE_PARM_DESC(inject_load_failure,
module_param_named(enable_dpcd_backlight, i915.enable_dpcd_backlight, bool, 0600);
MODULE_PARM_DESC(enable_dpcd_backlight,
"Enable support for DPCD backlight control (default:false)");
+
+module_param_named(enable_gvt, i915.enable_gvt, bool, 0600);
+MODULE_PARM_DESC(enable_gvt,
+ "Enable support for Intel GVT-g graphics virtualization host support(default:false)");
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index 1323261..0ad020b 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -63,6 +63,7 @@ struct i915_params {
bool nuclear_pageflip;
bool enable_dp_mst;
bool enable_dpcd_backlight;
+ bool enable_gvt;
};

extern struct i915_params i915 __read_mostly;
diff --git a/drivers/gpu/drm/i915/intel_gvt.c b/drivers/gpu/drm/i915/intel_gvt.c
new file mode 100644
index 0000000..8556f58
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_gvt.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "i915_drv.h"
+#include "intel_gvt.h"
+
+/**
+ * DOC: Intel GVT-g host support
+ *
+ * Intel GVT-g is a graphics virtualization technology which shares the
+ * GPU among multiple virtual machines on a time-sharing basis. Each
+ * virtual machine is presented a virtual GPU (vGPU), which has equivalent
+ * features as the underlying physical GPU (pGPU), so i915 driver can run
+ * seamlessly in a virtual machine. This file provides the englightments
+ * of GVT and the necessary components used by GVT in i915 driver.
+ */
+
+static bool is_supported_device(struct drm_i915_private *dev_priv)
+{
+ if (IS_BROADWELL(dev_priv))
+ return true;
+ return false;
+}
+
+/**
+ * intel_gvt_init - initialize GVT components
+ * @dev_priv: drm i915 private data
+ *
+ * This function is called at the initialization stage to create a GVT device.
+ *
+ * Returns:
+ * Zero on success, negative error code if failed.
+ *
+ */
+int intel_gvt_init(struct drm_i915_private *dev_priv)
+{
+ if (!i915.enable_gvt) {
+ DRM_DEBUG_DRIVER("GVT-g is disabled by kernel params\n");
+ return 0;
+ }
+
+ if (!is_supported_device(dev_priv)) {
+ DRM_DEBUG_DRIVER("Unsupported device. GVT-g is disabled\n");
+ return 0;
+ }
+
+ dev_priv->gvt = intel_gvt_create_device(dev_priv);
+ if (IS_ERR(dev_priv->gvt)) {
+ DRM_DEBUG_DRIVER("GVT-g is disabled\n");
+ dev_priv->gvt = NULL;
+ return 0;
+ }
+ return 0;
+}
+
+/**
+ * intel_gvt_cleanup - cleanup GVT components when i915 driver is unloading
+ * @dev_priv: drm i915 private *
+ *
+ * This function is called at the i915 driver unloading stage, to shutdown
+ * GVT components and release the related resources.
+ */
+void intel_gvt_cleanup(struct drm_i915_private *dev_priv)
+{
+ if (!intel_gvt_active(dev_priv))
+ return;
+
+ intel_gvt_destroy_device(dev_priv->gvt);
+ dev_priv->gvt = NULL;
+}
diff --git a/drivers/gpu/drm/i915/intel_gvt.h b/drivers/gpu/drm/i915/intel_gvt.h
new file mode 100644
index 0000000..b9b361b
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_gvt.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef _INTEL_GVT_H_
+#define _INTEL_GVT_H_
+
+#ifdef CONFIG_DRM_I915_GVT
+#include "gvt/gvt.h"
+extern int intel_gvt_init(struct drm_i915_private *dev_priv);
+extern void intel_gvt_cleanup(struct drm_i915_private *dev_priv);
+extern struct intel_gvt *intel_gvt_create_device(
+ struct drm_i915_private *dev_priv);
+extern void intel_gvt_destroy_device(struct intel_gvt *gvt);
+#else
+struct intel_gvt {
+};
+static inline int intel_gvt_init(struct drm_i915_private *dev_priv)
+{
+ return 0;
+}
+static inline void intel_gvt_cleanup(struct drm_i915_private *dev_priv)
+{
+}
+#endif
+
+#endif /* _INTEL_GVT_H_ */
--
1.9.1