From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c | 96 +++++++++++++++++++++++++++ 1 file changed, 96 insertions(+) create mode 100644 kernel/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c (limited to 'kernel/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c') diff --git a/kernel/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c b/kernel/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c new file mode 100644 index 000000000..6cfe7f1f1 --- /dev/null +++ b/kernel/drivers/gpu/drm/amd/amdkfd/kfd_pasid.c @@ -0,0 +1,96 @@ +/* + * Copyright 2014 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + */ + +#include +#include +#include "kfd_priv.h" + +static unsigned long *pasid_bitmap; +static unsigned int pasid_limit; +static DEFINE_MUTEX(pasid_mutex); + +int kfd_pasid_init(void) +{ + pasid_limit = KFD_MAX_NUM_OF_PROCESSES; + + pasid_bitmap = kcalloc(BITS_TO_LONGS(pasid_limit), sizeof(long), GFP_KERNEL); + if (!pasid_bitmap) + return -ENOMEM; + + set_bit(0, pasid_bitmap); /* PASID 0 is reserved. */ + + return 0; +} + +void kfd_pasid_exit(void) +{ + kfree(pasid_bitmap); +} + +bool kfd_set_pasid_limit(unsigned int new_limit) +{ + if (new_limit < pasid_limit) { + bool ok; + + mutex_lock(&pasid_mutex); + + /* ensure that no pasids >= new_limit are in-use */ + ok = (find_next_bit(pasid_bitmap, pasid_limit, new_limit) == + pasid_limit); + if (ok) + pasid_limit = new_limit; + + mutex_unlock(&pasid_mutex); + + return ok; + } + + return true; +} + +inline unsigned int kfd_get_pasid_limit(void) +{ + return pasid_limit; +} + +unsigned int kfd_pasid_alloc(void) +{ + unsigned int found; + + mutex_lock(&pasid_mutex); + + found = find_first_zero_bit(pasid_bitmap, pasid_limit); + if (found == pasid_limit) + found = 0; + else + set_bit(found, pasid_bitmap); + + mutex_unlock(&pasid_mutex); + + return found; +} + +void kfd_pasid_free(unsigned int pasid) +{ + BUG_ON(pasid == 0 || pasid >= pasid_limit); + clear_bit(pasid, pasid_bitmap); +} -- cgit 1.2.3-korg