Merge tag 'drm-habanalabs-next-2023-10-10' of https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux into drm-next

This tag contains habanalabs driver changes for v6.7.

The notable changes are:

- uAPI changes:
  - Expose tsc clock sampling to better sync clock information in profiler.
  - Enhance engine error reporting in the info ioctl.
  - Block access to the eventfd operations through the control device.
  - Disable the option of the user to register multiple times with the same
    offset for timestamp dump by the driver. If a user wants to use the same
    offset in the timestamp buffer for different interrupt, it needs to first
    de-register the offset.
  - When exporting dma-buf (for p2p), force the user to specify size/offset
    in multiples of PAGE_SIZE. This is instead of the driver doing the
    rounding to PAGE_SIZE, which has caused the driver to map more memory
    than was intended by the user.

- New features and improvements:
  - Complete the move of the driver to the accel subsystem by removing the
    custom habanalabs class and major and registering to accel subsystem.
  - Move the firmware interface files to include/linux/habanalabs. This is
    a pre-requisite for upstreaming the NIC drivers of Gaudi (as they need to
    include those files).
  - Perform device hard-reset upon PCIe AXI drain event to prevent the failure
    from cascading to different IP blocks in the SoC. In secured environments,
    this is done automatically by the firmware.
  - Print device name when it is removed for better debuggability.
  - Add support for trace of dma map sgtable operations.
  - Optimize handling of user interrupts by splitting the interrupts to two
    lists. One list for fast handling and second list for handling with
    timestamp recording, which is slower.
  - Prevent double device hard-reset due to 2 adjacent H/W events.
  - Set device status 'malfunction' while in rmmod.

- Firmware related fixes:
  - Extend preboot timeout because preboot loading might take longer than
    expected in certain cases.
  - Add a protection mechanism for the Event Queue. In case it is full, the
    firmware will be able to notify about it through a dedicated interrupt.
  - Perform device hard-reset in case scrubbing of memory has failed.

- Bug fixes and code cleanups:
  - Small fixes of dma-buf handling in Gaudi2, such as handling an offset != 0,
    using the correct exported size, creation of sg table.
  - Fix spmu mask creation.
  - Fix bug in wait for cs completion for decoder workloads.
  - Cleanup Greco name from documentation.
  - Fix bug in recording timestamp during cs completion interrupt handling.
  - Fix CoreSight ETF configuration and flush logic.
  - Fix small bug in hpriv_list handling (the list that contains the private
    data per process that opens our device).

Signed-off-by: Dave Airlie <airlied@redhat.com>

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From: Oded Gabbay <ogabbay@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/ZSUfiX4J7v4Wn0cU@ogabbay-vm-u22.habana-labs.com

1 files changed, 8 insertions, 13 deletions

diff --git a/drivers/accel/drm_accel.c b/drivers/accel/drm_accel.c
index 94b4ac12cf24..294b572a9c33 100644
--- a/drivers/accel/drm_accel.c
+++ b/drivers/accel/drm_accel.c
@@ -21,7 +21,6 @@ static DEFINE_SPINLOCK(accel_minor_lock);
 static struct idr accel_minors_idr;
 
 static struct dentry *accel_debugfs_root;
-static struct class *accel_class;
 
 static struct device_type accel_sysfs_device_minor = {
 	.name = "accel_minor"
@@ -32,23 +31,19 @@ static char *accel_devnode(const struct device *dev, umode_t *mode)
 	return kasprintf(GFP_KERNEL, "accel/%s", dev_name(dev));
 }
 
+static const struct class accel_class = {
+	.name = "accel",
+	.devnode = accel_devnode,
+};
+
 static int accel_sysfs_init(void)
 {
-	accel_class = class_create("accel");
-	if (IS_ERR(accel_class))
-		return PTR_ERR(accel_class);
-
-	accel_class->devnode = accel_devnode;
-
-	return 0;
+	return class_register(&accel_class);
 }
 
 static void accel_sysfs_destroy(void)
 {
-	if (IS_ERR_OR_NULL(accel_class))
-		return;
-	class_destroy(accel_class);
-	accel_class = NULL;
+	class_unregister(&accel_class);
 }
 
 static int accel_name_info(struct seq_file *m, void *data)
@@ -117,7 +112,7 @@ void accel_debugfs_register(struct drm_device *dev)
 void accel_set_device_instance_params(struct device *kdev, int index)
 {
 	kdev->devt = MKDEV(ACCEL_MAJOR, index);
-	kdev->class = accel_class;
+	kdev->class = &accel_class;
 	kdev->type = &accel_sysfs_device_minor;
 }