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linux-next/drivers/misc/habanalabs/asid.c
Oded Gabbay 0b28d26b9d habanalabs: initialize device CPU queues after MMU init
This patch changes the order of H/W IP initializations. The MMU needs to
be initialized before the device CPU queues, because the CPU will go
through the ASIC MMU in order to reach the host memory (where the queues
are located).

Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
2019-05-29 14:24:51 +03:00

58 lines
1.1 KiB
C

// 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 KMD 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);
}