Contributors: 22
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Glauber de Oliveira Costa |
434 |
53.71% |
8 |
16.67% |
| Konrad Rzeszutek Wilk |
118 |
14.60% |
2 |
4.17% |
| Christoph Hellwig |
61 |
7.55% |
6 |
12.50% |
| Fenghua Yu |
56 |
6.93% |
3 |
6.25% |
| Olof Johansson |
30 |
3.71% |
1 |
2.08% |
| Denys Vlasenko |
24 |
2.97% |
2 |
4.17% |
| FUJITA Tomonori |
23 |
2.85% |
6 |
12.50% |
| Joerg Roedel |
16 |
1.98% |
5 |
10.42% |
| Ville Syrjälä |
12 |
1.49% |
1 |
2.08% |
| Björn Helgaas |
7 |
0.87% |
1 |
2.08% |
| Robin Murphy |
5 |
0.62% |
1 |
2.08% |
| Yinghai Lu |
5 |
0.62% |
1 |
2.08% |
| Paul Gortmaker |
3 |
0.37% |
1 |
2.08% |
| David Woodhouse |
3 |
0.37% |
2 |
4.17% |
| Tejun Heo |
3 |
0.37% |
1 |
2.08% |
| Jan Beulich |
2 |
0.25% |
1 |
2.08% |
| Ingo Molnar |
1 |
0.12% |
1 |
2.08% |
| Bart Van Assche |
1 |
0.12% |
1 |
2.08% |
| Mike Rapoport |
1 |
0.12% |
1 |
2.08% |
| Greg Kroah-Hartman |
1 |
0.12% |
1 |
2.08% |
| Paul Bolle |
1 |
0.12% |
1 |
2.08% |
| Kay Sievers |
1 |
0.12% |
1 |
2.08% |
| Total |
808 |
|
48 |
|
// SPDX-License-Identifier: GPL-2.0
#include <linux/dma-direct.h>
#include <linux/dma-debug.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 = &dma_direct_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;
/*
* This variable becomes 1 if iommu=pt is passed on the kernel command line.
* If this variable is 1, IOMMU implementations do no DMA translation for
* devices and allow every device to access to whole physical memory. This is
* useful if a user wants to use an IOMMU only for KVM device assignment to
* guests and not for driver dma translation.
* It is also possible to disable by default in kernel config, and enable with
* iommu=nopt at boot time.
*/
#ifdef CONFIG_IOMMU_DEFAULT_PASSTHROUGH
int iommu_pass_through __read_mostly = 1;
#else
int iommu_pass_through __read_mostly;
#endif
extern struct iommu_table_entry __iommu_table[], __iommu_table_end[];
/* Dummy device used for NULL arguments (normally ISA). */
struct device x86_dma_fallback_dev = {
.init_name = "fallback device",
.coherent_dma_mask = ISA_DMA_BIT_MASK,
.dma_mask = &x86_dma_fallback_dev.coherent_dma_mask,
};
EXPORT_SYMBOL(x86_dma_fallback_dev);
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;
}
}
}
bool arch_dma_alloc_attrs(struct device **dev)
{
if (!*dev)
*dev = &x86_dma_fallback_dev;
if (!is_device_dma_capable(*dev))
return false;
return true;
}
EXPORT_SYMBOL(arch_dma_alloc_attrs);
/*
* See <Documentation/x86/x86_64/boot-options.txt> 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_pass_through = 1;
if (!strncmp(p, "nopt", 4))
iommu_pass_through = 0;
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