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// 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 (asid == HL_KERNEL_ASID_ID || asid >= hdev->asic_prop.max_asid) {
dev_crit(hdev->dev, "Invalid ASID %lu", asid);
return;
}
clear_bit(asid, hdev->asid_bitmap);
}
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