| 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 | |
| 12 | int hl_asid_init(struct hl_device *hdev) |
| 13 | { |
| 14 | hdev->asid_bitmap = bitmap_zalloc(nbits: 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(nr: 0, addr: hdev->asid_bitmap); |
| 22 | |
| 23 | return 0; |
| 24 | } |
| 25 | |
| 26 | void hl_asid_fini(struct hl_device *hdev) |
| 27 | { |
| 28 | mutex_destroy(lock: &hdev->asid_mutex); |
| 29 | bitmap_free(bitmap: hdev->asid_bitmap); |
| 30 | } |
| 31 | |
| 32 | unsigned 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(addr: hdev->asid_bitmap, |
| 39 | size: hdev->asic_prop.max_asid); |
| 40 | if (found == hdev->asic_prop.max_asid) |
| 41 | found = 0; |
| 42 | else |
| 43 | set_bit(nr: found, addr: hdev->asid_bitmap); |
| 44 | |
| 45 | mutex_unlock(lock: &hdev->asid_mutex); |
| 46 | |
| 47 | return found; |
| 48 | } |
| 49 | |
| 50 | void 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(nr: asid, addr: hdev->asid_bitmap); |
| 58 | } |
| 59 |