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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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b24413180f
Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
268 lines
7.0 KiB
C
268 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* IOMMU mmap management and range allocation functions.
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* Based almost entirely upon the powerpc iommu allocator.
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*/
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#include <linux/export.h>
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#include <linux/bitmap.h>
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#include <linux/bug.h>
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#include <linux/iommu-helper.h>
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#include <linux/iommu-common.h>
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#include <linux/dma-mapping.h>
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#include <linux/hash.h>
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static unsigned long iommu_large_alloc = 15;
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static DEFINE_PER_CPU(unsigned int, iommu_hash_common);
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static inline bool need_flush(struct iommu_map_table *iommu)
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{
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return ((iommu->flags & IOMMU_NEED_FLUSH) != 0);
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}
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static inline void set_flush(struct iommu_map_table *iommu)
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{
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iommu->flags |= IOMMU_NEED_FLUSH;
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}
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static inline void clear_flush(struct iommu_map_table *iommu)
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{
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iommu->flags &= ~IOMMU_NEED_FLUSH;
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}
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static void setup_iommu_pool_hash(void)
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{
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unsigned int i;
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static bool do_once;
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if (do_once)
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return;
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do_once = true;
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for_each_possible_cpu(i)
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per_cpu(iommu_hash_common, i) = hash_32(i, IOMMU_POOL_HASHBITS);
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}
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/*
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* Initialize iommu_pool entries for the iommu_map_table. `num_entries'
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* is the number of table entries. If `large_pool' is set to true,
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* the top 1/4 of the table will be set aside for pool allocations
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* of more than iommu_large_alloc pages.
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*/
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void iommu_tbl_pool_init(struct iommu_map_table *iommu,
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unsigned long num_entries,
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u32 table_shift,
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void (*lazy_flush)(struct iommu_map_table *),
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bool large_pool, u32 npools,
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bool skip_span_boundary_check)
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{
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unsigned int start, i;
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struct iommu_pool *p = &(iommu->large_pool);
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setup_iommu_pool_hash();
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if (npools == 0)
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iommu->nr_pools = IOMMU_NR_POOLS;
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else
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iommu->nr_pools = npools;
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BUG_ON(npools > IOMMU_NR_POOLS);
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iommu->table_shift = table_shift;
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iommu->lazy_flush = lazy_flush;
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start = 0;
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if (skip_span_boundary_check)
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iommu->flags |= IOMMU_NO_SPAN_BOUND;
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if (large_pool)
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iommu->flags |= IOMMU_HAS_LARGE_POOL;
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if (!large_pool)
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iommu->poolsize = num_entries/iommu->nr_pools;
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else
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iommu->poolsize = (num_entries * 3 / 4)/iommu->nr_pools;
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for (i = 0; i < iommu->nr_pools; i++) {
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spin_lock_init(&(iommu->pools[i].lock));
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iommu->pools[i].start = start;
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iommu->pools[i].hint = start;
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start += iommu->poolsize; /* start for next pool */
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iommu->pools[i].end = start - 1;
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}
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if (!large_pool)
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return;
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/* initialize large_pool */
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spin_lock_init(&(p->lock));
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p->start = start;
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p->hint = p->start;
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p->end = num_entries;
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}
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EXPORT_SYMBOL(iommu_tbl_pool_init);
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unsigned long iommu_tbl_range_alloc(struct device *dev,
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struct iommu_map_table *iommu,
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unsigned long npages,
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unsigned long *handle,
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unsigned long mask,
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unsigned int align_order)
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{
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unsigned int pool_hash = __this_cpu_read(iommu_hash_common);
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unsigned long n, end, start, limit, boundary_size;
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struct iommu_pool *pool;
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int pass = 0;
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unsigned int pool_nr;
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unsigned int npools = iommu->nr_pools;
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unsigned long flags;
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bool large_pool = ((iommu->flags & IOMMU_HAS_LARGE_POOL) != 0);
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bool largealloc = (large_pool && npages > iommu_large_alloc);
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unsigned long shift;
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unsigned long align_mask = 0;
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if (align_order > 0)
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align_mask = ~0ul >> (BITS_PER_LONG - align_order);
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/* Sanity check */
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if (unlikely(npages == 0)) {
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WARN_ON_ONCE(1);
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return IOMMU_ERROR_CODE;
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}
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if (largealloc) {
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pool = &(iommu->large_pool);
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pool_nr = 0; /* to keep compiler happy */
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} else {
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/* pick out pool_nr */
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pool_nr = pool_hash & (npools - 1);
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pool = &(iommu->pools[pool_nr]);
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}
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spin_lock_irqsave(&pool->lock, flags);
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again:
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if (pass == 0 && handle && *handle &&
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(*handle >= pool->start) && (*handle < pool->end))
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start = *handle;
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else
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start = pool->hint;
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limit = pool->end;
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/* The case below can happen if we have a small segment appended
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* to a large, or when the previous alloc was at the very end of
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* the available space. If so, go back to the beginning. If a
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* flush is needed, it will get done based on the return value
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* from iommu_area_alloc() below.
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*/
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if (start >= limit)
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start = pool->start;
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shift = iommu->table_map_base >> iommu->table_shift;
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if (limit + shift > mask) {
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limit = mask - shift + 1;
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/* If we're constrained on address range, first try
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* at the masked hint to avoid O(n) search complexity,
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* but on second pass, start at 0 in pool 0.
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*/
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if ((start & mask) >= limit || pass > 0) {
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spin_unlock(&(pool->lock));
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pool = &(iommu->pools[0]);
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spin_lock(&(pool->lock));
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start = pool->start;
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} else {
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start &= mask;
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}
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}
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if (dev)
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boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
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1 << iommu->table_shift);
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else
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boundary_size = ALIGN(1ULL << 32, 1 << iommu->table_shift);
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boundary_size = boundary_size >> iommu->table_shift;
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/*
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* if the skip_span_boundary_check had been set during init, we set
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* things up so that iommu_is_span_boundary() merely checks if the
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* (index + npages) < num_tsb_entries
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*/
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if ((iommu->flags & IOMMU_NO_SPAN_BOUND) != 0) {
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shift = 0;
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boundary_size = iommu->poolsize * iommu->nr_pools;
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}
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n = iommu_area_alloc(iommu->map, limit, start, npages, shift,
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boundary_size, align_mask);
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if (n == -1) {
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if (likely(pass == 0)) {
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/* First failure, rescan from the beginning. */
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pool->hint = pool->start;
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set_flush(iommu);
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pass++;
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goto again;
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} else if (!largealloc && pass <= iommu->nr_pools) {
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spin_unlock(&(pool->lock));
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pool_nr = (pool_nr + 1) & (iommu->nr_pools - 1);
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pool = &(iommu->pools[pool_nr]);
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spin_lock(&(pool->lock));
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pool->hint = pool->start;
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set_flush(iommu);
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pass++;
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goto again;
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} else {
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/* give up */
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n = IOMMU_ERROR_CODE;
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goto bail;
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}
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}
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if (iommu->lazy_flush &&
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(n < pool->hint || need_flush(iommu))) {
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clear_flush(iommu);
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iommu->lazy_flush(iommu);
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}
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end = n + npages;
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pool->hint = end;
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/* Update handle for SG allocations */
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if (handle)
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*handle = end;
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bail:
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spin_unlock_irqrestore(&(pool->lock), flags);
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return n;
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}
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EXPORT_SYMBOL(iommu_tbl_range_alloc);
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static struct iommu_pool *get_pool(struct iommu_map_table *tbl,
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unsigned long entry)
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{
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struct iommu_pool *p;
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unsigned long largepool_start = tbl->large_pool.start;
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bool large_pool = ((tbl->flags & IOMMU_HAS_LARGE_POOL) != 0);
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/* The large pool is the last pool at the top of the table */
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if (large_pool && entry >= largepool_start) {
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p = &tbl->large_pool;
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} else {
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unsigned int pool_nr = entry / tbl->poolsize;
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BUG_ON(pool_nr >= tbl->nr_pools);
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p = &tbl->pools[pool_nr];
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}
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return p;
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}
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/* Caller supplies the index of the entry into the iommu map table
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* itself when the mapping from dma_addr to the entry is not the
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* default addr->entry mapping below.
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*/
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void iommu_tbl_range_free(struct iommu_map_table *iommu, u64 dma_addr,
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unsigned long npages, unsigned long entry)
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{
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struct iommu_pool *pool;
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unsigned long flags;
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unsigned long shift = iommu->table_shift;
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if (entry == IOMMU_ERROR_CODE) /* use default addr->entry mapping */
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entry = (dma_addr - iommu->table_map_base) >> shift;
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pool = get_pool(iommu, entry);
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spin_lock_irqsave(&(pool->lock), flags);
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bitmap_clear(iommu->map, entry, npages);
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spin_unlock_irqrestore(&(pool->lock), flags);
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}
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EXPORT_SYMBOL(iommu_tbl_range_free);
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