Merge tag 'misc-habanalabs-next-2020-07-24' of git://people.freedesktop.org/~gabbayo/linux into char-misc-next

Oded writes:

This tag contains the following changes for kernel 5.9-rc1:

- Remove rate limiters from GAUDI configuration (no longer needed).
- Set maximum amount of in-flight CS per ASIC type and increase
  the maximum amount for GAUDI.
- Refactor signal/wait command submissions code
- Calculate trace frequency from PLLs to show accurate profiling data
- Rephrase error messages to make them more clear to the common user
- Add statistics of dropped CS (counter per possible reason for drop)
- Get ECC information from firmware
- Remove support for partial SoC reset in Gaudi
- Halt device CPU only when reset is certain to happen. Sometimes we abort
  the reset procedure and in that case we can't leave device CPU in halt
  mode.
- set each CQ to its own work queue to prevent a race between completions
  on different CQs.
- Use queue pi/ci in order to determine queue occupancy. This is done to
  make the code reusable between current and future ASICs.
- Add more validations for user inputs.
- Refactor PCIe controller configuration to make the code reusable between
  current and future ASICs.
- Update firmware interface headers to latest version
- Move all common code to a dedicated common sub-folder

* tag 'misc-habanalabs-next-2020-07-24' of git://people.freedesktop.org/~gabbayo/linux: (28 commits)
  habanalabs: Fix memory leak in error flow of context initialization
  habanalabs: use no flags on MMU cache invalidation
  habanalabs: enable device before hw_init()
  habanalabs: create internal CB pool
  habanalabs: update hl_boot_if.h from firmware
  habanalabs: create common folder
  habanalabs: check for DMA errors when clearing memory
  habanalabs: verify queue can contain all cs jobs
  habanalabs: Assign each CQ with its own work queue
  habanalabs: halt device CPU only upon certain reset
  habanalabs: remove unused hash
  habanalabs: use queue pi/ci in order to determine queue occupancy
  habanalabs: configure maximum queues per asic
  habanalabs: remove soft-reset support from GAUDI
  habanalabs: PCIe iATU refactoring
  habanalabs: Extract ECC information from FW
  habanalabs: Add dropped cs statistics info struct
  habanalabs: extract cpu boot status lookup
  habanalabs: rephrase error messages
  habanalabs: Increase queues depth
  ...

1 files changed, 57 insertions, 0 deletions

diff --git a/drivers/misc/habanalabs/common/asid.c b/drivers/misc/habanalabs/common/asid.c
new file mode 100644
index 000000000000..a2fdf31cf27c
--- /dev/null
+++ b/drivers/misc/habanalabs/common/asid.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright 2016-2019 HabanaLabs, Ltd.
+ * All Rights Reserved.
+ */
+
+#include "habanalabs.h"
+
+#include <linux/slab.h>
+
+int hl_asid_init(struct hl_device *hdev)
+{
+	hdev->asid_bitmap = kcalloc(BITS_TO_LONGS(hdev->asic_prop.max_asid),
+					sizeof(*hdev->asid_bitmap), GFP_KERNEL);
+	if (!hdev->asid_bitmap)
+		return -ENOMEM;
+
+	mutex_init(&hdev->asid_mutex);
+
+	/* ASID 0 is reserved for the kernel driver and device CPU */
+	set_bit(0, hdev->asid_bitmap);
+
+	return 0;
+}
+
+void hl_asid_fini(struct hl_device *hdev)
+{
+	mutex_destroy(&hdev->asid_mutex);
+	kfree(hdev->asid_bitmap);
+}
+
+unsigned long hl_asid_alloc(struct hl_device *hdev)
+{
+	unsigned long found;
+
+	mutex_lock(&hdev->asid_mutex);
+
+	found = find_first_zero_bit(hdev->asid_bitmap,
+					hdev->asic_prop.max_asid);
+	if (found == hdev->asic_prop.max_asid)
+		found = 0;
+	else
+		set_bit(found, hdev->asid_bitmap);
+
+	mutex_unlock(&hdev->asid_mutex);
+
+	return found;
+}
+
+void hl_asid_free(struct hl_device *hdev, unsigned long asid)
+{
+	if (WARN((asid == 0 || asid >= hdev->asic_prop.max_asid),
+						"Invalid ASID %lu", asid))
+		return;
+	clear_bit(asid, hdev->asid_bitmap);
+}