mirror of
https://github.com/edk2-porting/linux-next.git
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dfc06b389a
If the user already specified a swiotlb size on the command line,
swiotlb_adjust_size should not overwrite it.
Fixes: 2cbc2776ef
("swiotlb: remove swiotlb_nr_tbl")
Reported-by: Tom Lendacky <thomas.lendacky@amd.com>
Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
681 lines
18 KiB
C
681 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Dynamic DMA mapping support.
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*
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* This implementation is a fallback for platforms that do not support
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* I/O TLBs (aka DMA address translation hardware).
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* Copyright (C) 2000 Asit Mallick <Asit.K.Mallick@intel.com>
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* Copyright (C) 2000 Goutham Rao <goutham.rao@intel.com>
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* Copyright (C) 2000, 2003 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*
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* 03/05/07 davidm Switch from PCI-DMA to generic device DMA API.
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* 00/12/13 davidm Rename to swiotlb.c and add mark_clean() to avoid
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* unnecessary i-cache flushing.
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* 04/07/.. ak Better overflow handling. Assorted fixes.
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* 05/09/10 linville Add support for syncing ranges, support syncing for
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* DMA_BIDIRECTIONAL mappings, miscellaneous cleanup.
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* 08/12/11 beckyb Add highmem support
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*/
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#define pr_fmt(fmt) "software IO TLB: " fmt
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#include <linux/cache.h>
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#include <linux/dma-direct.h>
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#include <linux/dma-map-ops.h>
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#include <linux/mm.h>
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#include <linux/export.h>
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#include <linux/spinlock.h>
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#include <linux/string.h>
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#include <linux/swiotlb.h>
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#include <linux/pfn.h>
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#include <linux/types.h>
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#include <linux/ctype.h>
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#include <linux/highmem.h>
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#include <linux/gfp.h>
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#include <linux/scatterlist.h>
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#include <linux/mem_encrypt.h>
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#include <linux/set_memory.h>
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#ifdef CONFIG_DEBUG_FS
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#include <linux/debugfs.h>
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#endif
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#include <asm/io.h>
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#include <asm/dma.h>
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#include <linux/init.h>
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#include <linux/memblock.h>
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#include <linux/iommu-helper.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/swiotlb.h>
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#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
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/*
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* Minimum IO TLB size to bother booting with. Systems with mainly
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* 64bit capable cards will only lightly use the swiotlb. If we can't
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* allocate a contiguous 1MB, we're probably in trouble anyway.
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*/
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#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
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#define INVALID_PHYS_ADDR (~(phys_addr_t)0)
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enum swiotlb_force swiotlb_force;
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struct io_tlb_mem *io_tlb_default_mem;
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/*
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* Max segment that we can provide which (if pages are contingous) will
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* not be bounced (unless SWIOTLB_FORCE is set).
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*/
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static unsigned int max_segment;
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static unsigned long default_nslabs = IO_TLB_DEFAULT_SIZE >> IO_TLB_SHIFT;
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static int __init
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setup_io_tlb_npages(char *str)
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{
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if (isdigit(*str)) {
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/* avoid tail segment of size < IO_TLB_SEGSIZE */
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default_nslabs =
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ALIGN(simple_strtoul(str, &str, 0), IO_TLB_SEGSIZE);
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}
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if (*str == ',')
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++str;
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if (!strcmp(str, "force"))
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swiotlb_force = SWIOTLB_FORCE;
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else if (!strcmp(str, "noforce"))
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swiotlb_force = SWIOTLB_NO_FORCE;
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return 0;
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}
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early_param("swiotlb", setup_io_tlb_npages);
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unsigned int swiotlb_max_segment(void)
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{
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return io_tlb_default_mem ? max_segment : 0;
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}
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EXPORT_SYMBOL_GPL(swiotlb_max_segment);
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void swiotlb_set_max_segment(unsigned int val)
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{
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if (swiotlb_force == SWIOTLB_FORCE)
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max_segment = 1;
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else
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max_segment = rounddown(val, PAGE_SIZE);
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}
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unsigned long swiotlb_size_or_default(void)
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{
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return default_nslabs << IO_TLB_SHIFT;
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}
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void __init swiotlb_adjust_size(unsigned long size)
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{
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/*
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* If swiotlb parameter has not been specified, give a chance to
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* architectures such as those supporting memory encryption to
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* adjust/expand SWIOTLB size for their use.
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*/
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if (default_nslabs != IO_TLB_DEFAULT_SIZE >> IO_TLB_SHIFT)
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return;
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size = ALIGN(size, IO_TLB_SIZE);
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default_nslabs = ALIGN(size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
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pr_info("SWIOTLB bounce buffer size adjusted to %luMB", size >> 20);
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}
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void swiotlb_print_info(void)
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{
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struct io_tlb_mem *mem = io_tlb_default_mem;
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if (!mem) {
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pr_warn("No low mem\n");
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return;
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}
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pr_info("mapped [mem %pa-%pa] (%luMB)\n", &mem->start, &mem->end,
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(mem->nslabs << IO_TLB_SHIFT) >> 20);
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}
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static inline unsigned long io_tlb_offset(unsigned long val)
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{
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return val & (IO_TLB_SEGSIZE - 1);
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}
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static inline unsigned long nr_slots(u64 val)
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{
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return DIV_ROUND_UP(val, IO_TLB_SIZE);
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}
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/*
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* Early SWIOTLB allocation may be too early to allow an architecture to
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* perform the desired operations. This function allows the architecture to
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* call SWIOTLB when the operations are possible. It needs to be called
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* before the SWIOTLB memory is used.
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*/
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void __init swiotlb_update_mem_attributes(void)
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{
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struct io_tlb_mem *mem = io_tlb_default_mem;
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void *vaddr;
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unsigned long bytes;
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if (!mem || mem->late_alloc)
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return;
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vaddr = phys_to_virt(mem->start);
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bytes = PAGE_ALIGN(mem->nslabs << IO_TLB_SHIFT);
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set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT);
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memset(vaddr, 0, bytes);
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}
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int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
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{
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unsigned long bytes = nslabs << IO_TLB_SHIFT, i;
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struct io_tlb_mem *mem;
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size_t alloc_size;
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if (swiotlb_force == SWIOTLB_NO_FORCE)
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return 0;
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/* protect against double initialization */
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if (WARN_ON_ONCE(io_tlb_default_mem))
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return -ENOMEM;
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alloc_size = PAGE_ALIGN(struct_size(mem, slots, nslabs));
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mem = memblock_alloc(alloc_size, PAGE_SIZE);
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if (!mem)
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panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
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__func__, alloc_size, PAGE_SIZE);
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mem->nslabs = nslabs;
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mem->start = __pa(tlb);
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mem->end = mem->start + bytes;
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mem->index = 0;
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spin_lock_init(&mem->lock);
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for (i = 0; i < mem->nslabs; i++) {
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mem->slots[i].list = IO_TLB_SEGSIZE - io_tlb_offset(i);
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mem->slots[i].orig_addr = INVALID_PHYS_ADDR;
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mem->slots[i].alloc_size = 0;
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}
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io_tlb_default_mem = mem;
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if (verbose)
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swiotlb_print_info();
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swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT);
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return 0;
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}
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/*
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* Statically reserve bounce buffer space and initialize bounce buffer data
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* structures for the software IO TLB used to implement the DMA API.
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*/
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void __init
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swiotlb_init(int verbose)
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{
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size_t bytes = PAGE_ALIGN(default_nslabs << IO_TLB_SHIFT);
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void *tlb;
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if (swiotlb_force == SWIOTLB_NO_FORCE)
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return;
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/* Get IO TLB memory from the low pages */
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tlb = memblock_alloc_low(bytes, PAGE_SIZE);
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if (!tlb)
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goto fail;
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if (swiotlb_init_with_tbl(tlb, default_nslabs, verbose))
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goto fail_free_mem;
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return;
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fail_free_mem:
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memblock_free_early(__pa(tlb), bytes);
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fail:
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pr_warn("Cannot allocate buffer");
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}
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/*
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* Systems with larger DMA zones (those that don't support ISA) can
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* initialize the swiotlb later using the slab allocator if needed.
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* This should be just like above, but with some error catching.
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*/
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int
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swiotlb_late_init_with_default_size(size_t default_size)
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{
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unsigned long nslabs =
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ALIGN(default_size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
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unsigned long bytes;
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unsigned char *vstart = NULL;
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unsigned int order;
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int rc = 0;
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if (swiotlb_force == SWIOTLB_NO_FORCE)
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return 0;
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/*
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* Get IO TLB memory from the low pages
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*/
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order = get_order(nslabs << IO_TLB_SHIFT);
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nslabs = SLABS_PER_PAGE << order;
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bytes = nslabs << IO_TLB_SHIFT;
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while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
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vstart = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN,
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order);
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if (vstart)
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break;
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order--;
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}
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if (!vstart)
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return -ENOMEM;
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if (order != get_order(bytes)) {
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pr_warn("only able to allocate %ld MB\n",
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(PAGE_SIZE << order) >> 20);
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nslabs = SLABS_PER_PAGE << order;
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}
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rc = swiotlb_late_init_with_tbl(vstart, nslabs);
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if (rc)
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free_pages((unsigned long)vstart, order);
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return rc;
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}
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int
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swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
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{
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unsigned long bytes = nslabs << IO_TLB_SHIFT, i;
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struct io_tlb_mem *mem;
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if (swiotlb_force == SWIOTLB_NO_FORCE)
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return 0;
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/* protect against double initialization */
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if (WARN_ON_ONCE(io_tlb_default_mem))
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return -ENOMEM;
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mem = (void *)__get_free_pages(GFP_KERNEL,
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get_order(struct_size(mem, slots, nslabs)));
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if (!mem)
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return -ENOMEM;
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mem->nslabs = nslabs;
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mem->start = virt_to_phys(tlb);
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mem->end = mem->start + bytes;
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mem->index = 0;
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mem->late_alloc = 1;
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spin_lock_init(&mem->lock);
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for (i = 0; i < mem->nslabs; i++) {
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mem->slots[i].list = IO_TLB_SEGSIZE - io_tlb_offset(i);
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mem->slots[i].orig_addr = INVALID_PHYS_ADDR;
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mem->slots[i].alloc_size = 0;
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}
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set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT);
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memset(tlb, 0, bytes);
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io_tlb_default_mem = mem;
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swiotlb_print_info();
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swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT);
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return 0;
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}
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void __init swiotlb_exit(void)
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{
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struct io_tlb_mem *mem = io_tlb_default_mem;
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size_t size;
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if (!mem)
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return;
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size = struct_size(mem, slots, mem->nslabs);
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if (mem->late_alloc)
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free_pages((unsigned long)mem, get_order(size));
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else
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memblock_free_late(__pa(mem), PAGE_ALIGN(size));
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io_tlb_default_mem = NULL;
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}
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/*
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* Bounce: copy the swiotlb buffer from or back to the original dma location
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*/
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static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size,
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enum dma_data_direction dir)
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{
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struct io_tlb_mem *mem = io_tlb_default_mem;
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int index = (tlb_addr - mem->start) >> IO_TLB_SHIFT;
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phys_addr_t orig_addr = mem->slots[index].orig_addr;
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size_t alloc_size = mem->slots[index].alloc_size;
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unsigned long pfn = PFN_DOWN(orig_addr);
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unsigned char *vaddr = phys_to_virt(tlb_addr);
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if (orig_addr == INVALID_PHYS_ADDR)
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return;
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if (size > alloc_size) {
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dev_WARN_ONCE(dev, 1,
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"Buffer overflow detected. Allocation size: %zu. Mapping size: %zu.\n",
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alloc_size, size);
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size = alloc_size;
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}
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if (PageHighMem(pfn_to_page(pfn))) {
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/* The buffer does not have a mapping. Map it in and copy */
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unsigned int offset = orig_addr & ~PAGE_MASK;
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char *buffer;
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unsigned int sz = 0;
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unsigned long flags;
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while (size) {
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sz = min_t(size_t, PAGE_SIZE - offset, size);
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local_irq_save(flags);
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buffer = kmap_atomic(pfn_to_page(pfn));
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if (dir == DMA_TO_DEVICE)
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memcpy(vaddr, buffer + offset, sz);
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else
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memcpy(buffer + offset, vaddr, sz);
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kunmap_atomic(buffer);
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local_irq_restore(flags);
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size -= sz;
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pfn++;
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vaddr += sz;
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offset = 0;
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}
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} else if (dir == DMA_TO_DEVICE) {
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memcpy(vaddr, phys_to_virt(orig_addr), size);
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} else {
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memcpy(phys_to_virt(orig_addr), vaddr, size);
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}
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}
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#define slot_addr(start, idx) ((start) + ((idx) << IO_TLB_SHIFT))
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/*
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* Return the offset into a iotlb slot required to keep the device happy.
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*/
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static unsigned int swiotlb_align_offset(struct device *dev, u64 addr)
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{
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return addr & dma_get_min_align_mask(dev) & (IO_TLB_SIZE - 1);
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}
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/*
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* Carefully handle integer overflow which can occur when boundary_mask == ~0UL.
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*/
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static inline unsigned long get_max_slots(unsigned long boundary_mask)
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{
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if (boundary_mask == ~0UL)
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return 1UL << (BITS_PER_LONG - IO_TLB_SHIFT);
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return nr_slots(boundary_mask + 1);
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}
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static unsigned int wrap_index(struct io_tlb_mem *mem, unsigned int index)
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{
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if (index >= mem->nslabs)
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return 0;
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return index;
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}
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/*
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* Find a suitable number of IO TLB entries size that will fit this request and
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* allocate a buffer from that IO TLB pool.
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*/
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static int find_slots(struct device *dev, phys_addr_t orig_addr,
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size_t alloc_size)
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{
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struct io_tlb_mem *mem = io_tlb_default_mem;
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unsigned long boundary_mask = dma_get_seg_boundary(dev);
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dma_addr_t tbl_dma_addr =
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phys_to_dma_unencrypted(dev, mem->start) & boundary_mask;
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unsigned long max_slots = get_max_slots(boundary_mask);
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unsigned int iotlb_align_mask =
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dma_get_min_align_mask(dev) & ~(IO_TLB_SIZE - 1);
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unsigned int nslots = nr_slots(alloc_size), stride;
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unsigned int index, wrap, count = 0, i;
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unsigned long flags;
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BUG_ON(!nslots);
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/*
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* For mappings with an alignment requirement don't bother looping to
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* unaligned slots once we found an aligned one. For allocations of
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* PAGE_SIZE or larger only look for page aligned allocations.
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*/
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stride = (iotlb_align_mask >> IO_TLB_SHIFT) + 1;
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if (alloc_size >= PAGE_SIZE)
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stride = max(stride, stride << (PAGE_SHIFT - IO_TLB_SHIFT));
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spin_lock_irqsave(&mem->lock, flags);
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if (unlikely(nslots > mem->nslabs - mem->used))
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goto not_found;
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index = wrap = wrap_index(mem, ALIGN(mem->index, stride));
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do {
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if ((slot_addr(tbl_dma_addr, index) & iotlb_align_mask) !=
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(orig_addr & iotlb_align_mask)) {
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index = wrap_index(mem, index + 1);
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continue;
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}
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/*
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* If we find a slot that indicates we have 'nslots' number of
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* contiguous buffers, we allocate the buffers from that slot
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* and mark the entries as '0' indicating unavailable.
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*/
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if (!iommu_is_span_boundary(index, nslots,
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nr_slots(tbl_dma_addr),
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max_slots)) {
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if (mem->slots[index].list >= nslots)
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goto found;
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}
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index = wrap_index(mem, index + stride);
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} while (index != wrap);
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not_found:
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spin_unlock_irqrestore(&mem->lock, flags);
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return -1;
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found:
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for (i = index; i < index + nslots; i++)
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mem->slots[i].list = 0;
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for (i = index - 1;
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io_tlb_offset(i) != IO_TLB_SEGSIZE - 1 &&
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mem->slots[i].list; i--)
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mem->slots[i].list = ++count;
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/*
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* Update the indices to avoid searching in the next round.
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*/
|
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if (index + nslots < mem->nslabs)
|
|
mem->index = index + nslots;
|
|
else
|
|
mem->index = 0;
|
|
mem->used += nslots;
|
|
|
|
spin_unlock_irqrestore(&mem->lock, flags);
|
|
return index;
|
|
}
|
|
|
|
phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
|
|
size_t mapping_size, size_t alloc_size,
|
|
enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
struct io_tlb_mem *mem = io_tlb_default_mem;
|
|
unsigned int offset = swiotlb_align_offset(dev, orig_addr);
|
|
unsigned int i;
|
|
int index;
|
|
phys_addr_t tlb_addr;
|
|
|
|
if (!mem)
|
|
panic("Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer");
|
|
|
|
if (mem_encrypt_active())
|
|
pr_warn_once("Memory encryption is active and system is using DMA bounce buffers\n");
|
|
|
|
if (mapping_size > alloc_size) {
|
|
dev_warn_once(dev, "Invalid sizes (mapping: %zd bytes, alloc: %zd bytes)",
|
|
mapping_size, alloc_size);
|
|
return (phys_addr_t)DMA_MAPPING_ERROR;
|
|
}
|
|
|
|
index = find_slots(dev, orig_addr, alloc_size + offset);
|
|
if (index == -1) {
|
|
if (!(attrs & DMA_ATTR_NO_WARN))
|
|
dev_warn_ratelimited(dev,
|
|
"swiotlb buffer is full (sz: %zd bytes), total %lu (slots), used %lu (slots)\n",
|
|
alloc_size, mem->nslabs, mem->used);
|
|
return (phys_addr_t)DMA_MAPPING_ERROR;
|
|
}
|
|
|
|
/*
|
|
* Save away the mapping from the original address to the DMA address.
|
|
* This is needed when we sync the memory. Then we sync the buffer if
|
|
* needed.
|
|
*/
|
|
for (i = 0; i < nr_slots(alloc_size + offset); i++) {
|
|
mem->slots[index + i].orig_addr = slot_addr(orig_addr, i);
|
|
mem->slots[index + i].alloc_size =
|
|
alloc_size - (i << IO_TLB_SHIFT);
|
|
}
|
|
tlb_addr = slot_addr(mem->start, index) + offset;
|
|
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
|
|
(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
|
|
swiotlb_bounce(dev, tlb_addr, mapping_size, DMA_TO_DEVICE);
|
|
return tlb_addr;
|
|
}
|
|
|
|
/*
|
|
* tlb_addr is the physical address of the bounce buffer to unmap.
|
|
*/
|
|
void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
|
|
size_t mapping_size, enum dma_data_direction dir,
|
|
unsigned long attrs)
|
|
{
|
|
struct io_tlb_mem *mem = io_tlb_default_mem;
|
|
unsigned long flags;
|
|
unsigned int offset = swiotlb_align_offset(hwdev, tlb_addr);
|
|
int index = (tlb_addr - offset - mem->start) >> IO_TLB_SHIFT;
|
|
int nslots = nr_slots(mem->slots[index].alloc_size + offset);
|
|
int count, i;
|
|
|
|
/*
|
|
* First, sync the memory before unmapping the entry
|
|
*/
|
|
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
|
|
(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
|
|
swiotlb_bounce(hwdev, tlb_addr, mapping_size, DMA_FROM_DEVICE);
|
|
|
|
/*
|
|
* Return the buffer to the free list by setting the corresponding
|
|
* entries to indicate the number of contiguous entries available.
|
|
* While returning the entries to the free list, we merge the entries
|
|
* with slots below and above the pool being returned.
|
|
*/
|
|
spin_lock_irqsave(&mem->lock, flags);
|
|
if (index + nslots < ALIGN(index + 1, IO_TLB_SEGSIZE))
|
|
count = mem->slots[index + nslots].list;
|
|
else
|
|
count = 0;
|
|
|
|
/*
|
|
* Step 1: return the slots to the free list, merging the slots with
|
|
* superceeding slots
|
|
*/
|
|
for (i = index + nslots - 1; i >= index; i--) {
|
|
mem->slots[i].list = ++count;
|
|
mem->slots[i].orig_addr = INVALID_PHYS_ADDR;
|
|
mem->slots[i].alloc_size = 0;
|
|
}
|
|
|
|
/*
|
|
* Step 2: merge the returned slots with the preceding slots, if
|
|
* available (non zero)
|
|
*/
|
|
for (i = index - 1;
|
|
io_tlb_offset(i) != IO_TLB_SEGSIZE - 1 && mem->slots[i].list;
|
|
i--)
|
|
mem->slots[i].list = ++count;
|
|
mem->used -= nslots;
|
|
spin_unlock_irqrestore(&mem->lock, flags);
|
|
}
|
|
|
|
void swiotlb_sync_single_for_device(struct device *dev, phys_addr_t tlb_addr,
|
|
size_t size, enum dma_data_direction dir)
|
|
{
|
|
if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
|
|
swiotlb_bounce(dev, tlb_addr, size, DMA_TO_DEVICE);
|
|
else
|
|
BUG_ON(dir != DMA_FROM_DEVICE);
|
|
}
|
|
|
|
void swiotlb_sync_single_for_cpu(struct device *dev, phys_addr_t tlb_addr,
|
|
size_t size, enum dma_data_direction dir)
|
|
{
|
|
if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)
|
|
swiotlb_bounce(dev, tlb_addr, size, DMA_FROM_DEVICE);
|
|
else
|
|
BUG_ON(dir != DMA_TO_DEVICE);
|
|
}
|
|
|
|
/*
|
|
* Create a swiotlb mapping for the buffer at @paddr, and in case of DMAing
|
|
* to the device copy the data into it as well.
|
|
*/
|
|
dma_addr_t swiotlb_map(struct device *dev, phys_addr_t paddr, size_t size,
|
|
enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
phys_addr_t swiotlb_addr;
|
|
dma_addr_t dma_addr;
|
|
|
|
trace_swiotlb_bounced(dev, phys_to_dma(dev, paddr), size,
|
|
swiotlb_force);
|
|
|
|
swiotlb_addr = swiotlb_tbl_map_single(dev, paddr, size, size, dir,
|
|
attrs);
|
|
if (swiotlb_addr == (phys_addr_t)DMA_MAPPING_ERROR)
|
|
return DMA_MAPPING_ERROR;
|
|
|
|
/* Ensure that the address returned is DMA'ble */
|
|
dma_addr = phys_to_dma_unencrypted(dev, swiotlb_addr);
|
|
if (unlikely(!dma_capable(dev, dma_addr, size, true))) {
|
|
swiotlb_tbl_unmap_single(dev, swiotlb_addr, size, dir,
|
|
attrs | DMA_ATTR_SKIP_CPU_SYNC);
|
|
dev_WARN_ONCE(dev, 1,
|
|
"swiotlb addr %pad+%zu overflow (mask %llx, bus limit %llx).\n",
|
|
&dma_addr, size, *dev->dma_mask, dev->bus_dma_limit);
|
|
return DMA_MAPPING_ERROR;
|
|
}
|
|
|
|
if (!dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
|
|
arch_sync_dma_for_device(swiotlb_addr, size, dir);
|
|
return dma_addr;
|
|
}
|
|
|
|
size_t swiotlb_max_mapping_size(struct device *dev)
|
|
{
|
|
return ((size_t)IO_TLB_SIZE) * IO_TLB_SEGSIZE;
|
|
}
|
|
|
|
bool is_swiotlb_active(void)
|
|
{
|
|
return io_tlb_default_mem != NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(is_swiotlb_active);
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
|
|
static int __init swiotlb_create_debugfs(void)
|
|
{
|
|
struct io_tlb_mem *mem = io_tlb_default_mem;
|
|
|
|
if (!mem)
|
|
return 0;
|
|
mem->debugfs = debugfs_create_dir("swiotlb", NULL);
|
|
debugfs_create_ulong("io_tlb_nslabs", 0400, mem->debugfs, &mem->nslabs);
|
|
debugfs_create_ulong("io_tlb_used", 0400, mem->debugfs, &mem->used);
|
|
return 0;
|
|
}
|
|
|
|
late_initcall(swiotlb_create_debugfs);
|
|
|
|
#endif
|