Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751613AbdFGHpx (ORCPT ); Wed, 7 Jun 2017 03:45:53 -0400 Received: from mga05.intel.com ([192.55.52.43]:40471 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751564AbdFGHpv (ORCPT ); Wed, 7 Jun 2017 03:45:51 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.39,310,1493708400"; d="scan'208";a="111873272" From: Xiaoguang Chen To: alex.williamson@redhat.com, kraxel@redhat.com, chris@chris-wilson.co.uk, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, zhenyuw@linux.intel.com, zhiyuan.lv@intel.com, intel-gvt-dev@lists.freedesktop.org, zhi.a.wang@intel.com, kevin.tian@intel.com Cc: Xiaoguang Chen Subject: [PATCH v7 6/6] drm/i915/gvt: Adding user interface for dma-buf Date: Wed, 7 Jun 2017 15:44:38 +0800 Message-Id: <1496821478-13574-7-git-send-email-xiaoguang.chen@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1496821478-13574-1-git-send-email-xiaoguang.chen@intel.com> References: <1496821478-13574-1-git-send-email-xiaoguang.chen@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 11717 Lines: 393 User space should create the management fd for the dma-buf operation first. Then user can query the plane information and create dma-buf if necessary using the management fd. Signed-off-by: Xiaoguang Chen --- drivers/gpu/drm/i915/gvt/dmabuf.c | 37 ++++++++- drivers/gpu/drm/i915/gvt/dmabuf.h | 5 ++ drivers/gpu/drm/i915/gvt/gvt.c | 3 + drivers/gpu/drm/i915/gvt/gvt.h | 5 ++ drivers/gpu/drm/i915/gvt/hypercall.h | 3 + drivers/gpu/drm/i915/gvt/kvmgt.c | 149 +++++++++++++++++++++++++++++++++++ drivers/gpu/drm/i915/gvt/mpt.h | 30 +++++++ drivers/gpu/drm/i915/gvt/vgpu.c | 2 + 8 files changed, 233 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gvt/dmabuf.c b/drivers/gpu/drm/i915/gvt/dmabuf.c index 411165da..ce1041f 100644 --- a/drivers/gpu/drm/i915/gvt/dmabuf.c +++ b/drivers/gpu/drm/i915/gvt/dmabuf.c @@ -81,6 +81,28 @@ static void intel_vgpu_gem_put_pages(struct drm_i915_gem_object *obj, static void intel_vgpu_gem_release(struct drm_i915_gem_object *obj) { + struct intel_vgpu_dmabuf_obj *dmabuf_obj; + struct intel_vgpu_fb_info *fb_info; + struct intel_vgpu *vgpu = NULL; + struct list_head *pos; + + fb_info = (struct intel_vgpu_fb_info *)obj->gvt_info; + if (WARN_ON(!fb_info && !fb_info->vgpu)) { + gvt_vgpu_err("gvt info is invalid\n"); + goto out; + } + + vgpu = fb_info->vgpu; + list_for_each(pos, &vgpu->dmabuf_obj_list_head) { + dmabuf_obj = container_of(pos, struct intel_vgpu_dmabuf_obj, + list); + if ((dmabuf_obj != NULL) && (dmabuf_obj->obj == obj)) { + kfree(dmabuf_obj); + break; + } + } + intel_gvt_hypervisor_put_vfio_device(vgpu); +out: kfree(obj->gvt_info); } @@ -225,6 +247,7 @@ int intel_vgpu_create_dmabuf(struct intel_vgpu *vgpu, void *args) struct vfio_vgpu_create_dmabuf *gvt_dmabuf = args; struct intel_vgpu_fb_info *fb_info; int ret; + struct intel_vgpu_dmabuf_obj *dmabuf_obj; ret = intel_vgpu_get_plane_info(dev, vgpu, &gvt_dmabuf->plane_info, gvt_dmabuf->plane_id); @@ -247,6 +270,16 @@ int intel_vgpu_create_dmabuf(struct intel_vgpu *vgpu, void *args) fb_info->vgpu = vgpu; obj->gvt_info = fb_info; + dmabuf_obj = kmalloc(sizeof(*dmabuf_obj), GFP_KERNEL); + if (!dmabuf_obj) { + gvt_vgpu_err("alloc dmabuf_obj failed\n"); + ret = -ENOMEM; + goto out_free_info; + } + dmabuf_obj->obj = obj; + INIT_LIST_HEAD(&dmabuf_obj->list); + list_add_tail(&dmabuf_obj->list, &vgpu->dmabuf_obj_list_head); + dmabuf = i915_gem_prime_export(dev, &obj->base, DRM_CLOEXEC | DRM_RDWR); if (IS_ERR(dmabuf)) { @@ -260,11 +293,13 @@ int intel_vgpu_create_dmabuf(struct intel_vgpu *vgpu, void *args) gvt_vgpu_err("create dma-buf fd failed ret:%d\n", ret); goto out_free; } - + intel_gvt_hypervisor_get_vfio_device(vgpu); gvt_dmabuf->fd = ret; return 0; out_free: + kfree(dmabuf_obj); +out_free_info: kfree(fb_info); out: i915_gem_object_put(obj); diff --git a/drivers/gpu/drm/i915/gvt/dmabuf.h b/drivers/gpu/drm/i915/gvt/dmabuf.h index 8be9979..cafa781 100644 --- a/drivers/gpu/drm/i915/gvt/dmabuf.h +++ b/drivers/gpu/drm/i915/gvt/dmabuf.h @@ -31,6 +31,11 @@ struct intel_vgpu_fb_info { uint32_t fb_size; }; +struct intel_vgpu_dmabuf_obj { + struct drm_i915_gem_object *obj; + struct list_head list; +}; + int intel_vgpu_query_plane(struct intel_vgpu *vgpu, void *args); int intel_vgpu_create_dmabuf(struct intel_vgpu *vgpu, void *args); diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c index 2032917..d589830 100644 --- a/drivers/gpu/drm/i915/gvt/gvt.c +++ b/drivers/gpu/drm/i915/gvt/gvt.c @@ -54,6 +54,9 @@ static const struct intel_gvt_ops intel_gvt_ops = { .vgpu_reset = intel_gvt_reset_vgpu, .vgpu_activate = intel_gvt_activate_vgpu, .vgpu_deactivate = intel_gvt_deactivate_vgpu, + .vgpu_query_plane = intel_vgpu_query_plane, + .vgpu_create_dmabuf = intel_vgpu_create_dmabuf, + }; /** diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h index 763a8c5..8f08c42 100644 --- a/drivers/gpu/drm/i915/gvt/gvt.h +++ b/drivers/gpu/drm/i915/gvt/gvt.h @@ -185,8 +185,11 @@ struct intel_vgpu { struct kvm *kvm; struct work_struct release_work; atomic_t released; + struct vfio_device *vfio_device; } vdev; #endif + atomic_t mgr_fd_opened; + struct list_head dmabuf_obj_list_head; }; struct intel_gvt_gm { @@ -467,6 +470,8 @@ struct intel_gvt_ops { void (*vgpu_reset)(struct intel_vgpu *); void (*vgpu_activate)(struct intel_vgpu *); void (*vgpu_deactivate)(struct intel_vgpu *); + int (*vgpu_query_plane)(struct intel_vgpu *vgpu, void *); + int (*vgpu_create_dmabuf)(struct intel_vgpu *vgpu, void *); }; diff --git a/drivers/gpu/drm/i915/gvt/hypercall.h b/drivers/gpu/drm/i915/gvt/hypercall.h index 32c345c..8f29c23 100644 --- a/drivers/gpu/drm/i915/gvt/hypercall.h +++ b/drivers/gpu/drm/i915/gvt/hypercall.h @@ -56,6 +56,9 @@ struct intel_gvt_mpt { int (*set_trap_area)(unsigned long handle, u64 start, u64 end, bool map); int (*set_opregion)(void *vgpu); + int (*get_vfio_device)(unsigned long handle); + void (*put_vfio_device)(unsigned long handle); + }; extern struct intel_gvt_mpt xengt_mpt; diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c index 6b4652a..2d4ad46 100644 --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -41,6 +41,7 @@ #include #include #include +#include #include "i915_drv.h" #include "gvt.h" @@ -523,6 +524,121 @@ static int kvmgt_set_opregion(void *p_vgpu) return ret; } +static int kvmgt_get_vfio_device(unsigned long handle) +{ + struct kvmgt_guest_info *info; + struct intel_vgpu *vgpu; + struct vfio_device *device; + + if (!handle_valid(handle)) + return -ESRCH; + + info = (struct kvmgt_guest_info *)handle; + vgpu = info->vgpu; + + device = vfio_device_get_from_dev(mdev_dev(vgpu->vdev.mdev)); + if (device == NULL) + return -ENODEV; + vgpu->vdev.vfio_device = device; + + return 0; +} + +static void kvmgt_put_vfio_device(unsigned long handle) +{ + struct kvmgt_guest_info *info; + struct intel_vgpu *vgpu; + + if (!handle_valid(handle)) + return; + + info = (struct kvmgt_guest_info *)handle; + vgpu = info->vgpu; + + vfio_device_put(vgpu->vdev.vfio_device); +} + +static int intel_vgpu_dmabuf_mgr_fd_mmap(struct file *file, + struct vm_area_struct *vma) +{ + return -EPERM; +} + +static int intel_vgpu_dmabuf_mgr_fd_release(struct inode *inode, + struct file *filp) +{ + struct intel_vgpu *vgpu = filp->private_data; + struct intel_vgpu_dmabuf_obj *obj; + struct list_head *pos; + + if (WARN_ON(!vgpu->vdev.vfio_device)) + return -ENODEV; + + list_for_each(pos, &vgpu->dmabuf_obj_list_head) { + obj = container_of(pos, struct intel_vgpu_dmabuf_obj, list); + if (WARN_ON(!obj)) + return -ENODEV; + i915_gem_object_put(obj->obj); + } + kvmgt_put_vfio_device(vgpu->handle); + atomic_set(&vgpu->mgr_fd_opened, 0); + + return 0; +} + +static long intel_vgpu_dmabuf_mgr_fd_ioctl(struct file *filp, + unsigned int ioctl, unsigned long arg) +{ + struct intel_vgpu *vgpu = filp->private_data; + int minsz; + int ret = 0; + + if (ioctl == VFIO_DEVICE_QUERY_PLANE) { + struct vfio_vgpu_query_plane plane_info; + + minsz = offsetofend(struct vfio_vgpu_query_plane, padding); + if (copy_from_user(&plane_info, (void __user *)arg, minsz)) + return -EFAULT; + if (plane_info.argsz < minsz || plane_info.flags != 0) + return -EINVAL; + ret = intel_gvt_ops->vgpu_query_plane(vgpu, &plane_info); + if (ret != 0) { + gvt_vgpu_err("query plane failed:%d\n", ret); + return -EINVAL; + } + return copy_to_user((void __user *)arg, &plane_info, minsz) ? + -EFAULT : 0; + } else if (ioctl == VFIO_DEVICE_CREATE_DMABUF) { + struct vfio_vgpu_create_dmabuf dmabuf; + + minsz = offsetofend(struct vfio_vgpu_create_dmabuf, plane_id); + if (copy_from_user(&dmabuf, (void __user *)arg, minsz)) + return -EFAULT; + if (dmabuf.argsz < minsz || dmabuf.flags != 0) + return -EINVAL; + ret = kvmgt_get_vfio_device(vgpu->handle); + if (ret != 0) + return ret; + + ret = intel_gvt_ops->vgpu_create_dmabuf(vgpu, &dmabuf); + if (ret != 0) { + kvmgt_put_vfio_device(vgpu->handle); + return ret; + } + return copy_to_user((void __user *)arg, &dmabuf, minsz) ? + -EFAULT : 0; + } else + gvt_vgpu_err("unsupported mgr fd operation\n"); + + return -EINVAL; +} + +static const struct file_operations intel_vgpu_dmabuf_mgr_fd_ops = { + .release = intel_vgpu_dmabuf_mgr_fd_release, + .unlocked_ioctl = intel_vgpu_dmabuf_mgr_fd_ioctl, + .mmap = intel_vgpu_dmabuf_mgr_fd_mmap, + .llseek = noop_llseek, +}; static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev) { struct intel_vgpu *vgpu = NULL; @@ -1249,6 +1365,36 @@ static long intel_vgpu_ioctl(struct mdev_device *mdev, unsigned int cmd, } else if (cmd == VFIO_DEVICE_RESET) { intel_gvt_ops->vgpu_reset(vgpu); return 0; + } else if (cmd == VFIO_DEVICE_GET_FD) { + int fd; + u32 type; + int ret; + + if (atomic_read(&vgpu->mgr_fd_opened)) { + gvt_vgpu_err("mgr fd already opened\n"); + return -EPERM; + } + + if (copy_from_user(&type, (void __user *)arg, sizeof(type))) + return -EINVAL; + if (type != VFIO_DEVICE_DMABUF_MGR_FD) + return -EINVAL; + + ret = kvmgt_get_vfio_device(vgpu->handle); + if (ret != 0) + return ret; + + fd = anon_inode_getfd("intel-vgpu-dmabuf-mgr-fd", + &intel_vgpu_dmabuf_mgr_fd_ops, + vgpu, O_RDWR | O_CLOEXEC); + if (fd < 0) { + kvmgt_put_vfio_device(vgpu->handle); + gvt_vgpu_err("create dmabuf mgr fd failed\n"); + return -EINVAL; + } + atomic_inc(&vgpu->mgr_fd_opened); + + return fd; } return 0; @@ -1612,6 +1758,9 @@ struct intel_gvt_mpt kvmgt_mpt = { .write_gpa = kvmgt_write_gpa, .gfn_to_mfn = kvmgt_gfn_to_pfn, .set_opregion = kvmgt_set_opregion, + .get_vfio_device = kvmgt_get_vfio_device, + .put_vfio_device = kvmgt_put_vfio_device, + }; EXPORT_SYMBOL_GPL(kvmgt_mpt); diff --git a/drivers/gpu/drm/i915/gvt/mpt.h b/drivers/gpu/drm/i915/gvt/mpt.h index ab71300..1be961e 100644 --- a/drivers/gpu/drm/i915/gvt/mpt.h +++ b/drivers/gpu/drm/i915/gvt/mpt.h @@ -308,4 +308,34 @@ static inline int intel_gvt_hypervisor_set_opregion(struct intel_vgpu *vgpu) return intel_gvt_host.mpt->set_opregion(vgpu); } +/** + * intel_gvt_hypervisor_get_vfio_device - increase vfio device ref count + * @vgpu: a vGPU + * + * Returns: + * Zero on success, negative error code if failed. + */ +static inline int intel_gvt_hypervisor_get_vfio_device(struct intel_vgpu *vgpu) +{ + if (!intel_gvt_host.mpt->get_vfio_device) + return 0; + + return intel_gvt_host.mpt->get_vfio_device(vgpu->handle); +} + +/** + * intel_gvt_hypervisor_put_vfio_device - decrease vfio device ref count + * @vgpu: a vGPU + * + * Returns: + * Zero on success, negative error code if failed. + */ +static inline void intel_gvt_hypervisor_put_vfio_device(struct intel_vgpu *vgpu) +{ + if (!intel_gvt_host.mpt->put_vfio_device) + return; + + intel_gvt_host.mpt->put_vfio_device(vgpu->handle); +} + #endif /* _GVT_MPT_H_ */ diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c index 8e1d504..8747613 100644 --- a/drivers/gpu/drm/i915/gvt/vgpu.c +++ b/drivers/gpu/drm/i915/gvt/vgpu.c @@ -346,6 +346,8 @@ static struct intel_vgpu *__intel_gvt_create_vgpu(struct intel_gvt *gvt, vgpu->gvt = gvt; vgpu->sched_ctl.weight = param->weight; bitmap_zero(vgpu->tlb_handle_pending, I915_NUM_ENGINES); + INIT_LIST_HEAD(&vgpu->dmabuf_obj_list_head); + atomic_set(&vgpu->mgr_fd_opened, 0); intel_vgpu_init_cfg_space(vgpu, param->primary); -- 2.7.4