[RFC PATCH v3 1/3] drivers/accel: define kconfig and register a new major

[Oded Gabbay <ogabbay@kernel.org>]

Add a new Kconfig for the accel subsystem. The Kconfig currently
contains only the basic CONFIG_DRM_ACCEL option that will be used to
decide whether to compile the accel registration code. Therefore, the
kconfig option is defined as bool.

The accel code will be compiled as part of drm.ko and will be called
directly from the DRM core code. The reason we compile it as part of
drm.ko and not as a separate module is because of cyclic dependency
between drm.ko and the separate module (if it would have existed).
This is due to the fact that DRM core code calls accel functions and
vice-versa.

The accelerator devices will be exposed to the user space with a new,
dedicated major number - 261.

The accel init function registers the new major number as a char device
and create corresponding sysfs and debugfs root entries, similar to
what is done in DRM init function.

I added a new header called drm_accel.h to include/drm/, that will hold
the prototypes of the drm_accel.c functions. In case CONFIG_DRM_ACCEL
is set to 'N', that header will contain empty inline implementations of
those functions, to allow DRM core code to compile successfully
without dependency on CONFIG_DRM_ACCEL.

I Updated the MAINTAINERS file accordingly with the newly added folder
and I have taken the liberty to appropriate the dri-devel mailing list
and the dri-devel IRC channel for the accel subsystem.

Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
---
Changes in v3:
 - Remove accel kernel module and build the code as part of drm.ko.
 - Rename CONFIG_ACCEL to CONFIG_DRM_ACCEL as the code is built as part of
   drm.ko.
 - Rename accel_drv.c to drm_accel.c
 - Change kconfig option to be bool instead of tristate
 - Add . at end of help text in kconfig

 Documentation/admin-guide/devices.txt |  5 ++
 MAINTAINERS                           |  8 +++
 drivers/Kconfig                       |  2 +
 drivers/accel/Kconfig                 | 24 ++++++++
 drivers/accel/drm_accel.c             | 82 +++++++++++++++++++++++++++
 drivers/gpu/drm/Makefile              |  1 +
 include/drm/drm_accel.h               | 31 ++++++++++
 7 files changed, 153 insertions(+)
 create mode 100644 drivers/accel/Kconfig
 create mode 100644 drivers/accel/drm_accel.c
 create mode 100644 include/drm/drm_accel.h

diff --git a/Documentation/admin-guide/devices.txt b/Documentation/admin-guide/devices.txt
index 9764d6edb189..06c525e01ea5 100644
--- a/Documentation/admin-guide/devices.txt
+++ b/Documentation/admin-guide/devices.txt
@@ -3080,6 +3080,11 @@
 		  ...
 		  255 = /dev/osd255	256th OSD Device

+ 261 char	Compute Acceleration Devices
+		  0 = /dev/accel/accel0	First acceleration device
+		  1 = /dev/accel/accel1	Second acceleration device
+		    ...
+
  384-511 char	RESERVED FOR DYNAMIC ASSIGNMENT
 		Character devices that request a dynamic allocation of major
 		number will take numbers starting from 511 and downward,
diff --git a/MAINTAINERS b/MAINTAINERS
index 30e3df70daec..5b07d81c985e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6825,6 +6825,14 @@ F:	include/drm/drm*
 F:	include/linux/vga*
 F:	include/uapi/drm/drm*

+DRM COMPUTE ACCELERATORS DRIVERS AND FRAMEWORK
+M:	Oded Gabbay <ogabbay@kernel.org>
+L:	dri-devel@lists.freedesktop.org
+S:	Maintained
+C:	irc://irc.oftc.net/dri-devel
+T:	git https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/accel.git
+F:	drivers/accel/
+
 DRM DRIVERS FOR ALLWINNER A10
 M:	Maxime Ripard <mripard@kernel.org>
 M:	Chen-Yu Tsai <wens@csie.org>
diff --git a/drivers/Kconfig b/drivers/Kconfig
index 19ee995bd0ae..968bd0a6fd78 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -99,6 +99,8 @@ source "drivers/media/Kconfig"

 source "drivers/video/Kconfig"

+source "drivers/accel/Kconfig"
+
 source "sound/Kconfig"

 source "drivers/hid/Kconfig"
diff --git a/drivers/accel/Kconfig b/drivers/accel/Kconfig
new file mode 100644
index 000000000000..c9ce849b2984
--- /dev/null
+++ b/drivers/accel/Kconfig
@@ -0,0 +1,24 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Compute Acceleration device configuration
+#
+# This framework provides support for compute acceleration devices, such
+# as, but not limited to, Machine-Learning and Deep-Learning acceleration
+# devices
+#
+menuconfig DRM_ACCEL
+	bool "Compute Acceleration Framework"
+	depends on DRM
+	help
+	  Framework for device drivers of compute acceleration devices, such
+	  as, but not limited to, Machine-Learning and Deep-Learning
+	  acceleration devices.
+	  If you say Y here, you need to select the module that's right for
+	  your acceleration device from the list below.
+	  This framework is integrated with the DRM subsystem as compute
+	  accelerators and GPUs share a lot in common and can use almost the
+	  same infrastructure code.
+	  Having said that, acceleration devices will have a different
+	  major number than GPUs, and will be exposed to user-space using
+	  different device files, called accel/accel* (in /dev, sysfs
+	  and debugfs).
diff --git a/drivers/accel/drm_accel.c b/drivers/accel/drm_accel.c
new file mode 100644
index 000000000000..943d960ddefc
--- /dev/null
+++ b/drivers/accel/drm_accel.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright 2022 HabanaLabs, Ltd.
+ * All Rights Reserved.
+ *
+ */
+
+#include <linux/debugfs.h>
+#include <linux/device.h>
+
+#include <drm/drm_accel.h>
+#include <drm/drm_ioctl.h>
+#include <drm/drm_print.h>
+
+static struct dentry *accel_debugfs_root;
+static struct class *accel_class;
+
+static char *accel_devnode(struct device *dev, umode_t *mode)
+{
+	return kasprintf(GFP_KERNEL, "accel/%s", dev_name(dev));
+}
+
+static int accel_sysfs_init(void)
+{
+	accel_class = class_create(THIS_MODULE, "accel");
+	if (IS_ERR(accel_class))
+		return PTR_ERR(accel_class);
+
+	accel_class->devnode = accel_devnode;
+
+	return 0;
+}
+
+static void accel_sysfs_destroy(void)
+{
+	if (IS_ERR_OR_NULL(accel_class))
+		return;
+	class_destroy(accel_class);
+	accel_class = NULL;
+}
+
+static int accel_stub_open(struct inode *inode, struct file *filp)
+{
+	return -EOPNOTSUPP;
+}
+
+static const struct file_operations accel_stub_fops = {
+	.owner = THIS_MODULE,
+	.open = accel_stub_open,
+	.llseek = noop_llseek,
+};
+
+void accel_core_exit(void)
+{
+	unregister_chrdev(ACCEL_MAJOR, "accel");
+	debugfs_remove(accel_debugfs_root);
+	accel_sysfs_destroy();
+}
+
+int __init accel_core_init(void)
+{
+	int ret;
+
+	ret = accel_sysfs_init();
+	if (ret < 0) {
+		DRM_ERROR("Cannot create ACCEL class: %d\n", ret);
+		goto error;
+	}
+
+	accel_debugfs_root = debugfs_create_dir("accel", NULL);
+
+	ret = register_chrdev(ACCEL_MAJOR, "accel", &accel_stub_fops);
+	if (ret < 0)
+		goto error;
+
+error:
+	/* Any cleanup will be done in drm_core_exit() that will call
+	 * to accel_core_exit()
+	 */
+	return ret;
+}
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 6e55c47288e4..f51aa5eca7e7 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -70,6 +70,7 @@ drm-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
 drm-$(CONFIG_DRM_PRIVACY_SCREEN) += \
 	drm_privacy_screen.o \
 	drm_privacy_screen_x86.o
+drm-$(CONFIG_DRM_ACCEL) += ../../accel/drm_accel.o
 obj-$(CONFIG_DRM)	+= drm.o

 obj-$(CONFIG_DRM_NOMODESET) += drm_nomodeset.o
diff --git a/include/drm/drm_accel.h b/include/drm/drm_accel.h
new file mode 100644
index 000000000000..31b42d3d6a15
--- /dev/null
+++ b/include/drm/drm_accel.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright 2022 HabanaLabs, Ltd.
+ * All Rights Reserved.
+ *
+ */
+
+#ifndef DRM_ACCEL_H_
+#define DRM_ACCEL_H_
+
+#define ACCEL_MAJOR     261
+
+#if IS_ENABLED(CONFIG_DRM_ACCEL)
+
+void accel_core_exit(void);
+int accel_core_init(void);
+
+#else
+
+static inline void accel_core_exit(void)
+{
+}
+
+static inline int __init accel_core_init(void)
+{
+	return 0;
+}
+
+#endif /* IS_ENABLED(CONFIG_DRM_ACCEL) */
+
+#endif /* DRM_ACCEL_H_ */
--
2.25.1