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c7b6bac9c7
PASID is defined as a few different types in iommu including "int", "u32", and "unsigned int". To be consistent and to match with uapi definitions, define PASID and its variations (e.g. max PASID) as "u32". "u32" is also shorter and a little more explicit than "unsigned int". No PASID type change in uapi although it defines PASID as __u64 in some places. Suggested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Tony Luck <tony.luck@intel.com> Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Acked-by: Felix Kuehling <Felix.Kuehling@amd.com> Acked-by: Joerg Roedel <jroedel@suse.de> Link: https://lkml.kernel.org/r/1600187413-163670-2-git-send-email-fenghua.yu@intel.com
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/*
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* Copyright 2014 Advanced Micro Devices, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/types.h>
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#include "kfd_priv.h"
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#include "amdgpu_ids.h"
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static unsigned int pasid_bits = 16;
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static bool pasids_allocated; /* = false */
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bool kfd_set_pasid_limit(unsigned int new_limit)
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{
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if (new_limit < 2)
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return false;
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if (new_limit < (1U << pasid_bits)) {
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if (pasids_allocated)
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/* We've already allocated user PASIDs, too late to
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* change the limit
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*/
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return false;
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while (new_limit < (1U << pasid_bits))
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pasid_bits--;
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}
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return true;
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}
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unsigned int kfd_get_pasid_limit(void)
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{
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return 1U << pasid_bits;
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}
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u32 kfd_pasid_alloc(void)
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{
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int r = amdgpu_pasid_alloc(pasid_bits);
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if (r > 0) {
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pasids_allocated = true;
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return r;
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}
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return 0;
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}
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void kfd_pasid_free(u32 pasid)
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{
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amdgpu_pasid_free(pasid);
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}
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