163 lines
3.6 KiB
C
163 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/dma-direct.h>
|
|
#include <linux/dma-debug.h>
|
|
#include <linux/iommu.h>
|
|
#include <linux/dmar.h>
|
|
#include <linux/export.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/pci.h>
|
|
|
|
#include <asm/proto.h>
|
|
#include <asm/dma.h>
|
|
#include <asm/iommu.h>
|
|
#include <asm/gart.h>
|
|
#include <asm/calgary.h>
|
|
#include <asm/x86_init.h>
|
|
#include <asm/iommu_table.h>
|
|
|
|
static bool disable_dac_quirk __read_mostly;
|
|
|
|
const struct dma_map_ops *dma_ops;
|
|
EXPORT_SYMBOL(dma_ops);
|
|
|
|
#ifdef CONFIG_IOMMU_DEBUG
|
|
int panic_on_overflow __read_mostly = 1;
|
|
int force_iommu __read_mostly = 1;
|
|
#else
|
|
int panic_on_overflow __read_mostly = 0;
|
|
int force_iommu __read_mostly = 0;
|
|
#endif
|
|
|
|
int iommu_merge __read_mostly = 0;
|
|
|
|
int no_iommu __read_mostly;
|
|
/* Set this to 1 if there is a HW IOMMU in the system */
|
|
int iommu_detected __read_mostly = 0;
|
|
|
|
extern struct iommu_table_entry __iommu_table[], __iommu_table_end[];
|
|
|
|
void __init pci_iommu_alloc(void)
|
|
{
|
|
struct iommu_table_entry *p;
|
|
|
|
sort_iommu_table(__iommu_table, __iommu_table_end);
|
|
check_iommu_entries(__iommu_table, __iommu_table_end);
|
|
|
|
for (p = __iommu_table; p < __iommu_table_end; p++) {
|
|
if (p && p->detect && p->detect() > 0) {
|
|
p->flags |= IOMMU_DETECTED;
|
|
if (p->early_init)
|
|
p->early_init();
|
|
if (p->flags & IOMMU_FINISH_IF_DETECTED)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* See <Documentation/x86/x86_64/boot-options.rst> for the iommu kernel
|
|
* parameter documentation.
|
|
*/
|
|
static __init int iommu_setup(char *p)
|
|
{
|
|
iommu_merge = 1;
|
|
|
|
if (!p)
|
|
return -EINVAL;
|
|
|
|
while (*p) {
|
|
if (!strncmp(p, "off", 3))
|
|
no_iommu = 1;
|
|
/* gart_parse_options has more force support */
|
|
if (!strncmp(p, "force", 5))
|
|
force_iommu = 1;
|
|
if (!strncmp(p, "noforce", 7)) {
|
|
iommu_merge = 0;
|
|
force_iommu = 0;
|
|
}
|
|
|
|
if (!strncmp(p, "biomerge", 8)) {
|
|
iommu_merge = 1;
|
|
force_iommu = 1;
|
|
}
|
|
if (!strncmp(p, "panic", 5))
|
|
panic_on_overflow = 1;
|
|
if (!strncmp(p, "nopanic", 7))
|
|
panic_on_overflow = 0;
|
|
if (!strncmp(p, "merge", 5)) {
|
|
iommu_merge = 1;
|
|
force_iommu = 1;
|
|
}
|
|
if (!strncmp(p, "nomerge", 7))
|
|
iommu_merge = 0;
|
|
if (!strncmp(p, "forcesac", 8))
|
|
pr_warn("forcesac option ignored.\n");
|
|
if (!strncmp(p, "allowdac", 8))
|
|
pr_warn("allowdac option ignored.\n");
|
|
if (!strncmp(p, "nodac", 5))
|
|
pr_warn("nodac option ignored.\n");
|
|
if (!strncmp(p, "usedac", 6)) {
|
|
disable_dac_quirk = true;
|
|
return 1;
|
|
}
|
|
#ifdef CONFIG_SWIOTLB
|
|
if (!strncmp(p, "soft", 4))
|
|
swiotlb = 1;
|
|
#endif
|
|
if (!strncmp(p, "pt", 2))
|
|
iommu_set_default_passthrough(true);
|
|
if (!strncmp(p, "nopt", 4))
|
|
iommu_set_default_translated(true);
|
|
|
|
gart_parse_options(p);
|
|
|
|
#ifdef CONFIG_CALGARY_IOMMU
|
|
if (!strncmp(p, "calgary", 7))
|
|
use_calgary = 1;
|
|
#endif /* CONFIG_CALGARY_IOMMU */
|
|
|
|
p += strcspn(p, ",");
|
|
if (*p == ',')
|
|
++p;
|
|
}
|
|
return 0;
|
|
}
|
|
early_param("iommu", iommu_setup);
|
|
|
|
static int __init pci_iommu_init(void)
|
|
{
|
|
struct iommu_table_entry *p;
|
|
|
|
x86_init.iommu.iommu_init();
|
|
|
|
for (p = __iommu_table; p < __iommu_table_end; p++) {
|
|
if (p && (p->flags & IOMMU_DETECTED) && p->late_init)
|
|
p->late_init();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
/* Must execute after PCI subsystem */
|
|
rootfs_initcall(pci_iommu_init);
|
|
|
|
#ifdef CONFIG_PCI
|
|
/* Many VIA bridges seem to corrupt data for DAC. Disable it here */
|
|
|
|
static int via_no_dac_cb(struct pci_dev *pdev, void *data)
|
|
{
|
|
pdev->dev.bus_dma_mask = DMA_BIT_MASK(32);
|
|
return 0;
|
|
}
|
|
|
|
static void via_no_dac(struct pci_dev *dev)
|
|
{
|
|
if (!disable_dac_quirk) {
|
|
dev_info(&dev->dev, "disabling DAC on VIA PCI bridge\n");
|
|
pci_walk_bus(dev->subordinate, via_no_dac_cb, NULL);
|
|
}
|
|
}
|
|
DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID,
|
|
PCI_CLASS_BRIDGE_PCI, 8, via_no_dac);
|
|
#endif
|