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References: <20221119204435.97113-1-ogabbay@kernel.org> <20221119204435.97113-4-ogabbay@kernel.org>
 <20221122105552.edse4v3zb5q23e3k@mail.igalia.com>
In-Reply-To: <20221122105552.edse4v3zb5q23e3k@mail.igalia.com>
From:   Oded Gabbay <ogabbay@kernel.org>
Date:   Tue, 22 Nov 2022 12:59:29 +0200
Message-ID: <CAFCwf128w3yAJVKAL+YrqLLSC6JGOWoEqqNipigcWruNBo30oQ@mail.gmail.com>
Subject: Re: [PATCH v4 3/4] drm: initialize accel framework
To:     Melissa Wen <mwen@igalia.com>
Cc:     David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
        Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>,
        Jeffrey Hugo <quic_jhugo@quicinc.com>,
        Jason Gunthorpe <jgg@nvidia.com>,
        Arnd Bergmann <arnd@arndb.de>, Jiho Chu <jiho.chu@samsung.com>,
        John Hubbard <jhubbard@nvidia.com>,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        Christoph Hellwig <hch@infradead.org>,
        Christopher Friedt <chrisfriedt@gmail.com>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Kevin Hilman <khilman@baylibre.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        Yuji Ishikawa <yuji2.ishikawa@toshiba.co.jp>,
        Maciej Kwapulinski <maciej.kwapulinski@linux.intel.com>,
        Jagan Teki <jagan@amarulasolutions.com>
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Precedence: bulk

On Tue, Nov 22, 2022 at 12:56 PM Melissa Wen <mwen@igalia.com> wrote:
>
> On 11/19, Oded Gabbay wrote:
> > Now that we have the accel framework code ready, let's call the
> > accel functions from all the appropriate places. These places are the
> > drm module init/exit functions, and all the drm_minor handling
> > functions.
>
> Hi Oded,
>
> The proposal overall LGTM, but I didn't manage to compile the kernel
> with your patch series when DRM is enabled but accel support doesn't.
> Multiple missing link errors...
>
> Am I missing something? Can you take a look at it from this patch 3/4?
>
> Thanks,
>
> Melissa
Looking at it now, thanks for letting me know.
Oded

> >
> > Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
> > ---
> >  drivers/gpu/drm/drm_drv.c   | 102 ++++++++++++++++++++++++++----------
> >  drivers/gpu/drm/drm_sysfs.c |  24 ++++++---
> >  2 files changed, 91 insertions(+), 35 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> > index 8214a0b1ab7f..1aec019f6389 100644
> > --- a/drivers/gpu/drm/drm_drv.c
> > +++ b/drivers/gpu/drm/drm_drv.c
> > @@ -35,6 +35,7 @@
> >  #include <linux/slab.h>
> >  #include <linux/srcu.h>
> >
> > +#include <drm/drm_accel.h>
> >  #include <drm/drm_cache.h>
> >  #include <drm/drm_client.h>
> >  #include <drm/drm_color_mgmt.h>
> > @@ -90,6 +91,8 @@ static struct drm_minor **drm_minor_get_slot(struct drm_device *dev,
> >               return &dev->primary;
> >       case DRM_MINOR_RENDER:
> >               return &dev->render;
> > +     case DRM_MINOR_ACCEL:
> > +             return &dev->accel;
> >       default:
> >               BUG();
> >       }
> > @@ -104,9 +107,13 @@ static void drm_minor_alloc_release(struct drm_device *dev, void *data)
> >
> >       put_device(minor->kdev);
> >
> > -     spin_lock_irqsave(&drm_minor_lock, flags);
> > -     idr_remove(&drm_minors_idr, minor->index);
> > -     spin_unlock_irqrestore(&drm_minor_lock, flags);
> > +     if (minor->type == DRM_MINOR_ACCEL) {
> > +             accel_minor_remove(minor->index);
> > +     } else {
> > +             spin_lock_irqsave(&drm_minor_lock, flags);
> > +             idr_remove(&drm_minors_idr, minor->index);
> > +             spin_unlock_irqrestore(&drm_minor_lock, flags);
> > +     }
> >  }
> >
> >  static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
> > @@ -123,13 +130,17 @@ static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
> >       minor->dev = dev;
> >
> >       idr_preload(GFP_KERNEL);
> > -     spin_lock_irqsave(&drm_minor_lock, flags);
> > -     r = idr_alloc(&drm_minors_idr,
> > -                   NULL,
> > -                   64 * type,
> > -                   64 * (type + 1),
> > -                   GFP_NOWAIT);
> > -     spin_unlock_irqrestore(&drm_minor_lock, flags);
> > +     if (type == DRM_MINOR_ACCEL) {
> > +             r = accel_minor_alloc();
> > +     } else {
> > +             spin_lock_irqsave(&drm_minor_lock, flags);
> > +             r = idr_alloc(&drm_minors_idr,
> > +                     NULL,
> > +                     64 * type,
> > +                     64 * (type + 1),
> > +                     GFP_NOWAIT);
> > +             spin_unlock_irqrestore(&drm_minor_lock, flags);
> > +     }
> >       idr_preload_end();
> >
> >       if (r < 0)
> > @@ -161,10 +172,14 @@ static int drm_minor_register(struct drm_device *dev, unsigned int type)
> >       if (!minor)
> >               return 0;
> >
> > -     ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root);
> > -     if (ret) {
> > -             DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
> > -             goto err_debugfs;
> > +     if (minor->type == DRM_MINOR_ACCEL) {
> > +             accel_debugfs_init(minor, minor->index);
> > +     } else {
> > +             ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root);
> > +             if (ret) {
> > +                     DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
> > +                     goto err_debugfs;
> > +             }
> >       }
> >
> >       ret = device_add(minor->kdev);
> > @@ -172,9 +187,13 @@ static int drm_minor_register(struct drm_device *dev, unsigned int type)
> >               goto err_debugfs;
> >
> >       /* replace NULL with @minor so lookups will succeed from now on */
> > -     spin_lock_irqsave(&drm_minor_lock, flags);
> > -     idr_replace(&drm_minors_idr, minor, minor->index);
> > -     spin_unlock_irqrestore(&drm_minor_lock, flags);
> > +     if (minor->type == DRM_MINOR_ACCEL) {
> > +             accel_minor_replace(minor, minor->index);
> > +     } else {
> > +             spin_lock_irqsave(&drm_minor_lock, flags);
> > +             idr_replace(&drm_minors_idr, minor, minor->index);
> > +             spin_unlock_irqrestore(&drm_minor_lock, flags);
> > +     }
> >
> >       DRM_DEBUG("new minor registered %d\n", minor->index);
> >       return 0;
> > @@ -194,9 +213,13 @@ static void drm_minor_unregister(struct drm_device *dev, unsigned int type)
> >               return;
> >
> >       /* replace @minor with NULL so lookups will fail from now on */
> > -     spin_lock_irqsave(&drm_minor_lock, flags);
> > -     idr_replace(&drm_minors_idr, NULL, minor->index);
> > -     spin_unlock_irqrestore(&drm_minor_lock, flags);
> > +     if (minor->type == DRM_MINOR_ACCEL) {
> > +             accel_minor_replace(NULL, minor->index);
> > +     } else {
> > +             spin_lock_irqsave(&drm_minor_lock, flags);
> > +             idr_replace(&drm_minors_idr, NULL, minor->index);
> > +             spin_unlock_irqrestore(&drm_minor_lock, flags);
> > +     }
> >
> >       device_del(minor->kdev);
> >       dev_set_drvdata(minor->kdev, NULL); /* safety belt */
> > @@ -603,6 +626,14 @@ static int drm_dev_init(struct drm_device *dev,
> >       /* no per-device feature limits by default */
> >       dev->driver_features = ~0u;
> >
> > +     if (drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL) &&
> > +                             (drm_core_check_feature(dev, DRIVER_RENDER) ||
> > +                             drm_core_check_feature(dev, DRIVER_MODESET))) {
> > +
> > +             DRM_ERROR("DRM driver can't be both a compute acceleration and graphics driver\n");
> > +             return -EINVAL;
> > +     }
> > +
> >       drm_legacy_init_members(dev);
> >       INIT_LIST_HEAD(&dev->filelist);
> >       INIT_LIST_HEAD(&dev->filelist_internal);
> > @@ -628,15 +659,21 @@ static int drm_dev_init(struct drm_device *dev,
> >
> >       dev->anon_inode = inode;
> >
> > -     if (drm_core_check_feature(dev, DRIVER_RENDER)) {
> > -             ret = drm_minor_alloc(dev, DRM_MINOR_RENDER);
> > +     if (drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL)) {
> > +             ret = drm_minor_alloc(dev, DRM_MINOR_ACCEL);
> >               if (ret)
> >                       goto err;
> > -     }
> > +     } else {
> > +             if (drm_core_check_feature(dev, DRIVER_RENDER)) {
> > +                     ret = drm_minor_alloc(dev, DRM_MINOR_RENDER);
> > +                     if (ret)
> > +                             goto err;
> > +             }
> >
> > -     ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY);
> > -     if (ret)
> > -             goto err;
> > +             ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY);
> > +             if (ret)
> > +                     goto err;
> > +     }
> >
> >       ret = drm_legacy_create_map_hash(dev);
> >       if (ret)
> > @@ -883,6 +920,10 @@ int drm_dev_register(struct drm_device *dev, unsigned long flags)
> >       if (ret)
> >               goto err_minors;
> >
> > +     ret = drm_minor_register(dev, DRM_MINOR_ACCEL);
> > +     if (ret)
> > +             goto err_minors;
> > +
> >       ret = create_compat_control_link(dev);
> >       if (ret)
> >               goto err_minors;
> > @@ -902,12 +943,13 @@ int drm_dev_register(struct drm_device *dev, unsigned long flags)
> >                driver->name, driver->major, driver->minor,
> >                driver->patchlevel, driver->date,
> >                dev->dev ? dev_name(dev->dev) : "virtual device",
> > -              dev->primary->index);
> > +              dev->primary ? dev->primary->index : dev->accel->index);
> >
> >       goto out_unlock;
> >
> >  err_minors:
> >       remove_compat_control_link(dev);
> > +     drm_minor_unregister(dev, DRM_MINOR_ACCEL);
> >       drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
> >       drm_minor_unregister(dev, DRM_MINOR_RENDER);
> >  out_unlock:
> > @@ -950,6 +992,7 @@ void drm_dev_unregister(struct drm_device *dev)
> >       drm_legacy_rmmaps(dev);
> >
> >       remove_compat_control_link(dev);
> > +     drm_minor_unregister(dev, DRM_MINOR_ACCEL);
> >       drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
> >       drm_minor_unregister(dev, DRM_MINOR_RENDER);
> >  }
> > @@ -1034,6 +1077,7 @@ static const struct file_operations drm_stub_fops = {
> >  static void drm_core_exit(void)
> >  {
> >       drm_privacy_screen_lookup_exit();
> > +     accel_core_exit();
> >       unregister_chrdev(DRM_MAJOR, "drm");
> >       debugfs_remove(drm_debugfs_root);
> >       drm_sysfs_destroy();
> > @@ -1061,6 +1105,10 @@ static int __init drm_core_init(void)
> >       if (ret < 0)
> >               goto error;
> >
> > +     ret = accel_core_init();
> > +     if (ret < 0)
> > +             goto error;
> > +
> >       drm_privacy_screen_lookup_init();
> >
> >       drm_core_init_complete = true;
> > diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
> > index 430e00b16eec..b8da978d85bb 100644
> > --- a/drivers/gpu/drm/drm_sysfs.c
> > +++ b/drivers/gpu/drm/drm_sysfs.c
> > @@ -19,6 +19,7 @@
> >  #include <linux/kdev_t.h>
> >  #include <linux/slab.h>
> >
> > +#include <drm/drm_accel.h>
> >  #include <drm/drm_connector.h>
> >  #include <drm/drm_device.h>
> >  #include <drm/drm_file.h>
> > @@ -471,19 +472,26 @@ struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
> >       struct device *kdev;
> >       int r;
> >
> > -     if (minor->type == DRM_MINOR_RENDER)
> > -             minor_str = "renderD%d";
> > -     else
> > -             minor_str = "card%d";
> > -
> >       kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
> >       if (!kdev)
> >               return ERR_PTR(-ENOMEM);
> >
> >       device_initialize(kdev);
> > -     kdev->devt = MKDEV(DRM_MAJOR, minor->index);
> > -     kdev->class = drm_class;
> > -     kdev->type = &drm_sysfs_device_minor;
> > +
> > +     if (minor->type == DRM_MINOR_ACCEL) {
> > +             minor_str = "accel%d";
> > +             accel_set_device_instance_params(kdev, minor->index);
> > +     } else {
> > +             if (minor->type == DRM_MINOR_RENDER)
> > +                     minor_str = "renderD%d";
> > +             else
> > +                     minor_str = "card%d";
> > +
> > +             kdev->devt = MKDEV(DRM_MAJOR, minor->index);
> > +             kdev->class = drm_class;
> > +             kdev->type = &drm_sysfs_device_minor;
> > +     }
> > +
> >       kdev->parent = minor->dev->dev;
> >       kdev->release = drm_sysfs_release;
> >       dev_set_drvdata(kdev, minor);
> > --
> > 2.25.1
> >