summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/i915/gvt/gvt.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpu/drm/i915/gvt/gvt.c')
-rw-r--r--drivers/gpu/drm/i915/gvt/gvt.c145
1 files changed, 145 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
new file mode 100644
index 000000000000..927f4579f5b6
--- /dev/null
+++ b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -0,0 +1,145 @@
+/*
+ * 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 "i915_drv.h"
+
+struct intel_gvt_host intel_gvt_host;
+
+static const char * const supported_hypervisors[] = {
+ [INTEL_GVT_HYPERVISOR_XEN] = "XEN",
+ [INTEL_GVT_HYPERVISOR_KVM] = "KVM",
+};
+
+/**
+ * intel_gvt_init_host - Load MPT modules and detect if we're running in host
+ * @gvt: intel gvt device
+ *
+ * This function is called at the driver loading stage. If failed to find a
+ * loadable MPT module or detect currently we're running in a VM, then GVT-g
+ * will be disabled
+ *
+ * Returns:
+ * Zero on success, negative error code if failed.
+ *
+ */
+int intel_gvt_init_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]);
+
+ 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. */
+}
+
+/**
+ * intel_gvt_clean_device - clean a GVT device
+ * @gvt: intel gvt device
+ *
+ * This function is called at the driver unloading stage, to free the
+ * resources owned by a GVT device.
+ *
+ */
+void intel_gvt_clean_device(struct drm_i915_private *dev_priv)
+{
+ struct intel_gvt *gvt = &dev_priv->gvt;
+
+ if (WARN_ON(!gvt->initialized))
+ return;
+
+ /* Other de-initialization of GVT components will be introduced. */
+
+ gvt->initialized = false;
+}
+
+/**
+ * intel_gvt_init_device - initialize a GVT device
+ * @dev_priv: drm i915 private data
+ *
+ * This function is called at the initialization stage, to initialize
+ * necessary GVT components.
+ *
+ * Returns:
+ * Zero on success, negative error code if failed.
+ *
+ */
+int intel_gvt_init_device(struct drm_i915_private *dev_priv)
+{
+ struct intel_gvt *gvt = &dev_priv->gvt;
+ /*
+ * Cannot initialize GVT device without intel_gvt_host gets
+ * initialized first.
+ */
+ if (WARN_ON(!intel_gvt_host.initialized))
+ return -EINVAL;
+
+ if (WARN_ON(gvt->initialized))
+ return -EEXIST;
+
+ gvt_dbg_core("init gvt device\n");
+
+ init_device_info(gvt);
+ /*
+ * Other initialization of GVT components will be introduce here.
+ */
+ gvt_dbg_core("gvt device creation is done\n");
+ gvt->initialized = true;
+ return 0;
+}