From patchwork Fri Nov 30 06:51:24 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhenyu Wang X-Patchwork-Id: 10705793 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2176C14E2 for ; Fri, 30 Nov 2018 06:51:33 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 11E4D2F762 for ; Fri, 30 Nov 2018 06:51:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0456B2F774; Fri, 30 Nov 2018 06:51:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 4CA232F762 for ; Fri, 30 Nov 2018 06:51:32 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E07C26E560; Fri, 30 Nov 2018 06:51:30 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTPS id 101F86E55B; Fri, 30 Nov 2018 06:51:28 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 29 Nov 2018 22:51:28 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,297,1539673200"; d="scan'208";a="114094291" Received: from debian-nuc.sh.intel.com ([10.239.159.176]) by orsmga001.jf.intel.com with ESMTP; 29 Nov 2018 22:51:27 -0800 From: Zhenyu Wang To: intel-gfx@lists.freedesktop.org Date: Fri, 30 Nov 2018 14:51:24 +0800 Message-Id: <20181130065124.4325-1-zhenyuw@linux.intel.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181130060838.4528-3-zhenyuw@linux.intel.com> References: <20181130060838.4528-3-zhenyuw@linux.intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v2] drm/i915/gvt: Change KVMGT as self load module X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: intel-gvt-dev@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP 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 reference counting for any VFIO/mdev creation. This makes 'kvmgt' module really split from GVT device model. User needs to load 'kvmgt' to enable VFIO/mdev interface. v2: - Fix kvmgt order after i915 for built-in case Signed-off-by: Zhenyu Wang --- drivers/gpu/drm/i915/Makefile | 1 + drivers/gpu/drm/i915/gvt/Makefile | 1 - drivers/gpu/drm/i915/gvt/gvt.c | 107 +++++++++++---------------- drivers/gpu/drm/i915/gvt/gvt.h | 6 +- drivers/gpu/drm/i915/gvt/hypercall.h | 7 +- drivers/gpu/drm/i915/gvt/kvmgt.c | 17 +++-- drivers/gpu/drm/i915/gvt/mpt.h | 3 + drivers/gpu/drm/i915/intel_gvt.c | 9 --- 8 files changed, 66 insertions(+), 85 deletions(-) diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 0ff878c994e2..ae0d975a6f34 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -195,3 +195,4 @@ endif i915-y += intel_lpe_audio.o obj-$(CONFIG_DRM_I915) += i915.o +obj-$(CONFIG_DRM_I915_GVT_KVMGT) += gvt/kvmgt.o diff --git a/drivers/gpu/drm/i915/gvt/Makefile b/drivers/gpu/drm/i915/gvt/Makefile index b016dc753db9..271fb46d4dd0 100644 --- a/drivers/gpu/drm/i915/gvt/Makefile +++ b/drivers/gpu/drm/i915/gvt/Makefile @@ -7,4 +7,3 @@ GVT_SOURCE := gvt.o aperture_gm.o handlers.o vgpu.o trace_points.o firmware.o \ ccflags-y += -I$(src) -I$(src)/$(GVT_DIR) i915-y += $(addprefix $(GVT_DIR)/, $(GVT_SOURCE)) -obj-$(CONFIG_DRM_I915_GVT_KVMGT) += $(GVT_DIR)/kvmgt.o diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c index a5b760b7bc10..e1c9c20918af 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 +408,44 @@ int intel_gvt_init_device(struct drm_i915_private *dev_priv) 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]); + 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); diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h index b4ab1dad0143..8a4cf995d755 100644 --- a/drivers/gpu/drm/i915/gvt/gvt.h +++ b/drivers/gpu/drm/i915/gvt/gvt.h @@ -52,12 +52,8 @@ #define GVT_MAX_VGPU 8 -enum { - INTEL_GVT_HYPERVISOR_XEN = 0, - INTEL_GVT_HYPERVISOR_KVM, -}; - struct intel_gvt_host { + struct device *dev; bool initialized; int hypervisor_type; struct intel_gvt_mpt *mpt; diff --git a/drivers/gpu/drm/i915/gvt/hypercall.h b/drivers/gpu/drm/i915/gvt/hypercall.h index e49a9247ed78..50798868ab15 100644 --- a/drivers/gpu/drm/i915/gvt/hypercall.h +++ b/drivers/gpu/drm/i915/gvt/hypercall.h @@ -33,11 +33,17 @@ #ifndef _GVT_HYPERCALL_H_ #define _GVT_HYPERCALL_H_ +enum hypervisor_type { + INTEL_GVT_HYPERVISOR_XEN = 0, + INTEL_GVT_HYPERVISOR_KVM, +}; + /* * 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 { + enum hypervisor_type type; int (*host_init)(struct device *dev, void *gvt, const void *ops); void (*host_exit)(struct device *dev); int (*attach_vgpu)(void *vgpu, unsigned long *handle); @@ -67,6 +73,5 @@ struct intel_gvt_mpt { }; 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/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c index 1bbd04d30c42..6b7909d796c9 100644 --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -50,6 +50,7 @@ #include "gvt.h" static const struct intel_gvt_ops *intel_gvt_ops; +static struct intel_gvt *intel_gvt; /* helper macros copied from vfio-pci */ #define VFIO_PCI_OFFSET_SHIFT 40 @@ -1459,8 +1460,10 @@ static int kvmgt_host_init(struct device *dev, void *gvt, const void *ops) struct attribute_group **kvm_vgpu_type_groups; intel_gvt_ops = ops; + intel_gvt = (struct intel_gvt *)gvt; + if (!intel_gvt_ops->get_gvt_attrs(&kvm_type_attrs, - &kvm_vgpu_type_groups)) + &kvm_vgpu_type_groups)) return -EFAULT; intel_vgpu_ops.supported_type_groups = kvm_vgpu_type_groups; @@ -1658,13 +1661,14 @@ static bool kvmgt_guest_exit(struct kvmgt_guest_info *info) static int kvmgt_attach_vgpu(void *vgpu, unsigned long *handle) { - /* nothing to do here */ + if (!try_module_get(THIS_MODULE)) + return -EINVAL; return 0; } static void kvmgt_detach_vgpu(unsigned long handle) { - /* nothing to do here */ + module_put(THIS_MODULE); } static int kvmgt_inject_msi(unsigned long handle, u32 addr, u16 data) @@ -1849,7 +1853,8 @@ static bool kvmgt_is_valid_gfn(unsigned long handle, unsigned long gfn) return ret; } -struct intel_gvt_mpt kvmgt_mpt = { +static struct intel_gvt_mpt kvmgt_mpt = { + .type = INTEL_GVT_HYPERVISOR_KVM, .host_init = kvmgt_host_init, .host_exit = kvmgt_host_exit, .attach_vgpu = kvmgt_attach_vgpu, @@ -1868,15 +1873,17 @@ struct intel_gvt_mpt kvmgt_mpt = { .put_vfio_device = kvmgt_put_vfio_device, .is_valid_gfn = kvmgt_is_valid_gfn, }; -EXPORT_SYMBOL_GPL(kvmgt_mpt); static int __init kvmgt_init(void) { + if (intel_gvt_register_hypervisor(&kvmgt_mpt) < 0) + return -ENODEV; return 0; } static void __exit kvmgt_exit(void) { + intel_gvt_unregister_hypervisor(); } module_init(kvmgt_init); diff --git a/drivers/gpu/drm/i915/gvt/mpt.h b/drivers/gpu/drm/i915/gvt/mpt.h index c95ef77da62c..181194000fbd 100644 --- a/drivers/gpu/drm/i915/gvt/mpt.h +++ b/drivers/gpu/drm/i915/gvt/mpt.h @@ -360,4 +360,7 @@ static inline bool intel_gvt_hypervisor_is_valid_gfn( return intel_gvt_host.mpt->is_valid_gfn(vgpu->handle, gfn); } +extern int intel_gvt_register_hypervisor(struct intel_gvt_mpt *); +extern void intel_gvt_unregister_hypervisor(void); + #endif /* _GVT_MPT_H_ */ diff --git a/drivers/gpu/drm/i915/intel_gvt.c b/drivers/gpu/drm/i915/intel_gvt.c index c22b3e18a0f5..d74e59e22c9d 100644 --- a/drivers/gpu/drm/i915/intel_gvt.c +++ b/drivers/gpu/drm/i915/intel_gvt.c @@ -105,15 +105,6 @@ int intel_gvt_init(struct drm_i915_private *dev_priv) return -EIO; } - /* - * We're not in host or fail to find a MPT module, disable GVT-g - */ - ret = intel_gvt_init_host(); - if (ret) { - DRM_DEBUG_DRIVER("Not in host or MPT modules not found\n"); - goto bail; - } - ret = intel_gvt_init_device(dev_priv); if (ret) { DRM_DEBUG_DRIVER("Fail to init GVT device\n");