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Date: Tue, 22 Nov 2022 12:59:29 +0200
From: Oded Gabbay <ogabbay@...nel.org>
To: Melissa Wen <mwen@...lia.com>
Cc: David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
Jacek Lawrynowicz <jacek.lawrynowicz@...ux.intel.com>,
Jeffrey Hugo <quic_jhugo@...cinc.com>,
Jason Gunthorpe <jgg@...dia.com>,
Arnd Bergmann <arnd@...db.de>, Jiho Chu <jiho.chu@...sung.com>,
John Hubbard <jhubbard@...dia.com>,
linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
Christoph Hellwig <hch@...radead.org>,
Christopher Friedt <chrisfriedt@...il.com>,
Thomas Zimmermann <tzimmermann@...e.de>,
Kevin Hilman <khilman@...libre.com>,
Alex Deucher <alexander.deucher@....com>,
Yuji Ishikawa <yuji2.ishikawa@...hiba.co.jp>,
Maciej Kwapulinski <maciej.kwapulinski@...ux.intel.com>,
Jagan Teki <jagan@...rulasolutions.com>
Subject: Re: [PATCH v4 3/4] drm: initialize accel framework
On Tue, Nov 22, 2022 at 12:56 PM Melissa Wen <mwen@...lia.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@...nel.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
> >
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