asid.c

 1// SPDX-License-Identifier: GPL-2.0
 2
 3/*
 4 * Copyright 2016-2019 HabanaLabs, Ltd.
 5 * All Rights Reserved.
 6 */
 7
 8#include "habanalabs.h"
 9
10#include <linux/slab.h>
11
12int hl_asid_init(struct hl_device *hdev)
13{
14	hdev->asid_bitmap = bitmap_zalloc(hdev->asic_prop.max_asid, GFP_KERNEL);
15	if (!hdev->asid_bitmap)
16		return -ENOMEM;
17
18	mutex_init(&hdev->asid_mutex);
19
20	/* ASID 0 is reserved for the kernel driver and device CPU */
21	set_bit(0, hdev->asid_bitmap);
22
23	return 0;
24}
25
26void hl_asid_fini(struct hl_device *hdev)
27{
28	mutex_destroy(&hdev->asid_mutex);
29	bitmap_free(hdev->asid_bitmap);
30}
31
32unsigned long hl_asid_alloc(struct hl_device *hdev)
33{
34	unsigned long found;
35
36	mutex_lock(&hdev->asid_mutex);
37
38	found = find_first_zero_bit(hdev->asid_bitmap,
39					hdev->asic_prop.max_asid);
40	if (found == hdev->asic_prop.max_asid)
41		found = 0;
42	else
43		set_bit(found, hdev->asid_bitmap);
44
45	mutex_unlock(&hdev->asid_mutex);
46
47	return found;
48}
49
50void hl_asid_free(struct hl_device *hdev, unsigned long asid)
51{
52	if (asid == HL_KERNEL_ASID_ID || asid >= hdev->asic_prop.max_asid) {
53		dev_crit(hdev->dev, "Invalid ASID %lu", asid);
54		return;
55	}
56
57	clear_bit(asid, hdev->asid_bitmap);
58}