diff options
author | Zhenyu Wang <zhenyuw@linux.intel.com> | 2018-12-07 16:16:53 +0800 |
---|---|---|
committer | Zhenyu Wang <zhenyuw@linux.intel.com> | 2019-01-02 15:51:26 +0800 |
commit | 9bdb073464d6008ed1839d358e320108ed12daae (patch) | |
tree | 79a22cf91164040b75ba51f007df2193e80a5ead /drivers/gpu/drm/i915/gvt/gvt.c | |
parent | a2b8419a9e2975d19c0cd85f4912f2873bd974e0 (diff) |
drm/i915/gvt: Change KVMGT as self load module
This trys to make 'kvmgt' module as self loadable instead of loading
by i915/gvt device model. So hypervisor specific module could be
stand-alone, e.g only after loading hypervisor specific module, GVT
feature could be enabled via specific hypervisor interface, e.g VFIO/mdev.
So this trys to use hypervisor module register/unregister interface
for that. Hypervisor module needs to take care of module reference
itself when working for hypervisor interface, e.g for VFIO/mdev,
hypervisor module would reference counting mdev when open and release.
This makes 'kvmgt' module really split from GVT device model. User
needs to load 'kvmgt' to enable VFIO/mdev interface.
v6:
- remove unused variable
v5:
- put module reference in register error path
v4:
- fix checkpatch warning
v3:
- Fix module reference handling for device open and release. Unused
mdev devices would be cleaned up in device unregister when module unload.
v2:
- Fix kvmgt order after i915 for built-in case
Cc: "Yuan, Hang" <hang.yuan@intel.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: "He, Min" <min.he@intel.com>
Reviewed-by: Yuan, Hang <hang.yuan@intel.com>
Acked-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915/gvt/gvt.c')
-rw-r--r-- | drivers/gpu/drm/i915/gvt/gvt.c | 108 |
1 files changed, 44 insertions, 64 deletions
diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c index a5b760b7bc10..4e8947f33bd0 100644 --- a/drivers/gpu/drm/i915/gvt/gvt.c +++ b/drivers/gpu/drm/i915/gvt/gvt.c @@ -187,52 +187,6 @@ static const struct intel_gvt_ops intel_gvt_ops = { .write_protect_handler = intel_vgpu_page_track_handler, }; -/** - * intel_gvt_init_host - Load MPT modules and detect if we're running in host - * - * 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 { -#if IS_ENABLED(CONFIG_DRM_I915_GVT_KVMGT) - /* not in Xen. Try KVMGT */ - intel_gvt_host.mpt = try_then_request_module( - symbol_get(kvmgt_mpt), "kvmgt"); - intel_gvt_host.hypervisor_type = INTEL_GVT_HYPERVISOR_KVM; -#endif - } - - /* Fail to load MPT modules - bail out */ - if (!intel_gvt_host.mpt) - return -EINVAL; - - 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) { struct intel_gvt_device_info *info = &gvt->device_info; @@ -316,7 +270,6 @@ void intel_gvt_clean_device(struct drm_i915_private *dev_priv) return; intel_gvt_destroy_idle_vgpu(gvt->idle_vgpu); - intel_gvt_hypervisor_host_exit(&dev_priv->drm.pdev->dev); intel_gvt_cleanup_vgpu_type_groups(gvt); intel_gvt_clean_vgpu_types(gvt); @@ -352,13 +305,6 @@ int intel_gvt_init_device(struct drm_i915_private *dev_priv) struct intel_vgpu *vgpu; int ret; - /* - * Cannot initialize GVT device without intel_gvt_host gets - * initialized first. - */ - if (WARN_ON(!intel_gvt_host.initialized)) - return -EINVAL; - if (WARN_ON(dev_priv->gvt)) return -EEXIST; @@ -420,13 +366,6 @@ int intel_gvt_init_device(struct drm_i915_private *dev_priv) goto out_clean_types; } - ret = intel_gvt_hypervisor_host_init(&dev_priv->drm.pdev->dev, gvt, - &intel_gvt_ops); - if (ret) { - gvt_err("failed to register gvt-g host device: %d\n", ret); - goto out_clean_types; - } - vgpu = intel_gvt_create_idle_vgpu(gvt); if (IS_ERR(vgpu)) { ret = PTR_ERR(vgpu); @@ -441,6 +380,8 @@ int intel_gvt_init_device(struct drm_i915_private *dev_priv) gvt_dbg_core("gvt device initialization is done\n"); dev_priv->gvt = gvt; + intel_gvt_host.dev = &dev_priv->drm.pdev->dev; + intel_gvt_host.initialized = true; return 0; out_clean_types: @@ -467,6 +408,45 @@ out_clean_idr: return ret; } -#if IS_ENABLED(CONFIG_DRM_I915_GVT_KVMGT) -MODULE_SOFTDEP("pre: kvmgt"); -#endif +int +intel_gvt_register_hypervisor(struct intel_gvt_mpt *m) +{ + int ret; + void *gvt; + + if (!intel_gvt_host.initialized) + return -ENODEV; + + if (m->type != INTEL_GVT_HYPERVISOR_KVM && + m->type != INTEL_GVT_HYPERVISOR_XEN) + return -EINVAL; + + /* Get a reference for device model module */ + if (!try_module_get(THIS_MODULE)) + return -ENODEV; + + intel_gvt_host.mpt = m; + intel_gvt_host.hypervisor_type = m->type; + gvt = (void *)kdev_to_i915(intel_gvt_host.dev)->gvt; + + ret = intel_gvt_hypervisor_host_init(intel_gvt_host.dev, gvt, + &intel_gvt_ops); + if (ret < 0) { + gvt_err("Failed to init %s hypervisor module\n", + supported_hypervisors[intel_gvt_host.hypervisor_type]); + module_put(THIS_MODULE); + return -ENODEV; + } + gvt_dbg_core("Running with hypervisor %s in host mode\n", + supported_hypervisors[intel_gvt_host.hypervisor_type]); + return 0; +} +EXPORT_SYMBOL_GPL(intel_gvt_register_hypervisor); + +void +intel_gvt_unregister_hypervisor(void) +{ + intel_gvt_hypervisor_host_exit(intel_gvt_host.dev); + module_put(THIS_MODULE); +} +EXPORT_SYMBOL_GPL(intel_gvt_unregister_hypervisor); |