linux-stable/arch/x86/kernel/tce_64.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

177 lines
3.4 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* This file manages the translation entries for the IBM Calgary IOMMU.
*
* Derived from arch/powerpc/platforms/pseries/iommu.c
*
* Copyright (C) IBM Corporation, 2006
*
* Author: Jon Mason <jdmason@us.ibm.com>
* Author: Muli Ben-Yehuda <muli@il.ibm.com>
*/
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/memblock.h>
#include <asm/tce.h>
#include <asm/calgary.h>
#include <asm/proto.h>
#include <asm/cacheflush.h>
/* flush a tce at 'tceaddr' to main memory */
static inline void flush_tce(void* tceaddr)
{
/* a single tce can't cross a cache line */
if (boot_cpu_has(X86_FEATURE_CLFLUSH))
clflush(tceaddr);
else
wbinvd();
}
void tce_build(struct iommu_table *tbl, unsigned long index,
unsigned int npages, unsigned long uaddr, int direction)
{
u64* tp;
u64 t;
u64 rpn;
t = (1 << TCE_READ_SHIFT);
if (direction != DMA_TO_DEVICE)
t |= (1 << TCE_WRITE_SHIFT);
tp = ((u64*)tbl->it_base) + index;
while (npages--) {
rpn = (virt_to_bus((void*)uaddr)) >> PAGE_SHIFT;
t &= ~TCE_RPN_MASK;
t |= (rpn << TCE_RPN_SHIFT);
*tp = cpu_to_be64(t);
flush_tce(tp);
uaddr += PAGE_SIZE;
tp++;
}
}
void tce_free(struct iommu_table *tbl, long index, unsigned int npages)
{
u64* tp;
tp = ((u64*)tbl->it_base) + index;
while (npages--) {
*tp = cpu_to_be64(0);
flush_tce(tp);
tp++;
}
}
static inline unsigned int table_size_to_number_of_entries(unsigned char size)
{
/*
* size is the order of the table, 0-7
* smallest table is 8K entries, so shift result by 13 to
* multiply by 8K
*/
return (1 << size) << 13;
}
static int tce_table_setparms(struct pci_dev *dev, struct iommu_table *tbl)
{
unsigned int bitmapsz;
unsigned long bmppages;
int ret;
tbl->it_busno = dev->bus->number;
/* set the tce table size - measured in entries */
tbl->it_size = table_size_to_number_of_entries(specified_table_size);
/*
* number of bytes needed for the bitmap size in number of
* entries; we need one bit per entry
*/
bitmapsz = tbl->it_size / BITS_PER_BYTE;
bmppages = __get_free_pages(GFP_KERNEL, get_order(bitmapsz));
if (!bmppages) {
printk(KERN_ERR "Calgary: cannot allocate bitmap\n");
ret = -ENOMEM;
goto done;
}
tbl->it_map = (unsigned long*)bmppages;
memset(tbl->it_map, 0, bitmapsz);
tbl->it_hint = 0;
spin_lock_init(&tbl->it_lock);
return 0;
done:
return ret;
}
int __init build_tce_table(struct pci_dev *dev, void __iomem *bbar)
{
struct iommu_table *tbl;
int ret;
if (pci_iommu(dev->bus)) {
printk(KERN_ERR "Calgary: dev %p has sysdata->iommu %p\n",
dev, pci_iommu(dev->bus));
BUG();
}
tbl = kzalloc(sizeof(struct iommu_table), GFP_KERNEL);
if (!tbl) {
printk(KERN_ERR "Calgary: error allocating iommu_table\n");
ret = -ENOMEM;
goto done;
}
ret = tce_table_setparms(dev, tbl);
if (ret)
goto free_tbl;
tbl->bbar = bbar;
set_pci_iommu(dev->bus, tbl);
return 0;
free_tbl:
kfree(tbl);
done:
return ret;
}
void * __init alloc_tce_table(void)
{
unsigned int size;
size = table_size_to_number_of_entries(specified_table_size);
size *= TCE_ENTRY_SIZE;
return memblock_alloc_low(size, size);
}
void __init free_tce_table(void *tbl)
{
unsigned int size;
if (!tbl)
return;
size = table_size_to_number_of_entries(specified_table_size);
size *= TCE_ENTRY_SIZE;
memblock_free(__pa(tbl), size);
}