1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun
3*4882a593Smuzhiyun /*
4*4882a593Smuzhiyun * Copyright 2016-2019 HabanaLabs, Ltd.
5*4882a593Smuzhiyun * All Rights Reserved.
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include "habanalabs.h"
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/slab.h>
11*4882a593Smuzhiyun
hl_asid_init(struct hl_device * hdev)12*4882a593Smuzhiyun int hl_asid_init(struct hl_device *hdev)
13*4882a593Smuzhiyun {
14*4882a593Smuzhiyun hdev->asid_bitmap = kcalloc(BITS_TO_LONGS(hdev->asic_prop.max_asid),
15*4882a593Smuzhiyun sizeof(*hdev->asid_bitmap), GFP_KERNEL);
16*4882a593Smuzhiyun if (!hdev->asid_bitmap)
17*4882a593Smuzhiyun return -ENOMEM;
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun mutex_init(&hdev->asid_mutex);
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun /* ASID 0 is reserved for the kernel driver and device CPU */
22*4882a593Smuzhiyun set_bit(0, hdev->asid_bitmap);
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun return 0;
25*4882a593Smuzhiyun }
26*4882a593Smuzhiyun
hl_asid_fini(struct hl_device * hdev)27*4882a593Smuzhiyun void hl_asid_fini(struct hl_device *hdev)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun mutex_destroy(&hdev->asid_mutex);
30*4882a593Smuzhiyun kfree(hdev->asid_bitmap);
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun
hl_asid_alloc(struct hl_device * hdev)33*4882a593Smuzhiyun unsigned long hl_asid_alloc(struct hl_device *hdev)
34*4882a593Smuzhiyun {
35*4882a593Smuzhiyun unsigned long found;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun mutex_lock(&hdev->asid_mutex);
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun found = find_first_zero_bit(hdev->asid_bitmap,
40*4882a593Smuzhiyun hdev->asic_prop.max_asid);
41*4882a593Smuzhiyun if (found == hdev->asic_prop.max_asid)
42*4882a593Smuzhiyun found = 0;
43*4882a593Smuzhiyun else
44*4882a593Smuzhiyun set_bit(found, hdev->asid_bitmap);
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun mutex_unlock(&hdev->asid_mutex);
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun return found;
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
hl_asid_free(struct hl_device * hdev,unsigned long asid)51*4882a593Smuzhiyun void hl_asid_free(struct hl_device *hdev, unsigned long asid)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun if (WARN((asid == 0 || asid >= hdev->asic_prop.max_asid),
54*4882a593Smuzhiyun "Invalid ASID %lu", asid))
55*4882a593Smuzhiyun return;
56*4882a593Smuzhiyun clear_bit(asid, hdev->asid_bitmap);
57*4882a593Smuzhiyun }
58