Loading...
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/dma-direct.h>
3#include <linux/dma-debug.h>
4#include <linux/iommu.h>
5#include <linux/dmar.h>
6#include <linux/export.h>
7#include <linux/memblock.h>
8#include <linux/gfp.h>
9#include <linux/pci.h>
10
11#include <asm/proto.h>
12#include <asm/dma.h>
13#include <asm/iommu.h>
14#include <asm/gart.h>
15#include <asm/calgary.h>
16#include <asm/x86_init.h>
17#include <asm/iommu_table.h>
18
19static bool disable_dac_quirk __read_mostly;
20
21const struct dma_map_ops *dma_ops;
22EXPORT_SYMBOL(dma_ops);
23
24#ifdef CONFIG_IOMMU_DEBUG
25int panic_on_overflow __read_mostly = 1;
26int force_iommu __read_mostly = 1;
27#else
28int panic_on_overflow __read_mostly = 0;
29int force_iommu __read_mostly = 0;
30#endif
31
32int iommu_merge __read_mostly = 0;
33
34int no_iommu __read_mostly;
35/* Set this to 1 if there is a HW IOMMU in the system */
36int iommu_detected __read_mostly = 0;
37
38extern struct iommu_table_entry __iommu_table[], __iommu_table_end[];
39
40void __init pci_iommu_alloc(void)
41{
42 struct iommu_table_entry *p;
43
44 sort_iommu_table(__iommu_table, __iommu_table_end);
45 check_iommu_entries(__iommu_table, __iommu_table_end);
46
47 for (p = __iommu_table; p < __iommu_table_end; p++) {
48 if (p && p->detect && p->detect() > 0) {
49 p->flags |= IOMMU_DETECTED;
50 if (p->early_init)
51 p->early_init();
52 if (p->flags & IOMMU_FINISH_IF_DETECTED)
53 break;
54 }
55 }
56}
57
58/*
59 * See <Documentation/x86/x86_64/boot-options.rst> for the iommu kernel
60 * parameter documentation.
61 */
62static __init int iommu_setup(char *p)
63{
64 iommu_merge = 1;
65
66 if (!p)
67 return -EINVAL;
68
69 while (*p) {
70 if (!strncmp(p, "off", 3))
71 no_iommu = 1;
72 /* gart_parse_options has more force support */
73 if (!strncmp(p, "force", 5))
74 force_iommu = 1;
75 if (!strncmp(p, "noforce", 7)) {
76 iommu_merge = 0;
77 force_iommu = 0;
78 }
79
80 if (!strncmp(p, "biomerge", 8)) {
81 iommu_merge = 1;
82 force_iommu = 1;
83 }
84 if (!strncmp(p, "panic", 5))
85 panic_on_overflow = 1;
86 if (!strncmp(p, "nopanic", 7))
87 panic_on_overflow = 0;
88 if (!strncmp(p, "merge", 5)) {
89 iommu_merge = 1;
90 force_iommu = 1;
91 }
92 if (!strncmp(p, "nomerge", 7))
93 iommu_merge = 0;
94 if (!strncmp(p, "forcesac", 8))
95 pr_warn("forcesac option ignored.\n");
96 if (!strncmp(p, "allowdac", 8))
97 pr_warn("allowdac option ignored.\n");
98 if (!strncmp(p, "nodac", 5))
99 pr_warn("nodac option ignored.\n");
100 if (!strncmp(p, "usedac", 6)) {
101 disable_dac_quirk = true;
102 return 1;
103 }
104#ifdef CONFIG_SWIOTLB
105 if (!strncmp(p, "soft", 4))
106 swiotlb = 1;
107#endif
108 if (!strncmp(p, "pt", 2))
109 iommu_set_default_passthrough(true);
110 if (!strncmp(p, "nopt", 4))
111 iommu_set_default_translated(true);
112
113 gart_parse_options(p);
114
115#ifdef CONFIG_CALGARY_IOMMU
116 if (!strncmp(p, "calgary", 7))
117 use_calgary = 1;
118#endif /* CONFIG_CALGARY_IOMMU */
119
120 p += strcspn(p, ",");
121 if (*p == ',')
122 ++p;
123 }
124 return 0;
125}
126early_param("iommu", iommu_setup);
127
128static int __init pci_iommu_init(void)
129{
130 struct iommu_table_entry *p;
131
132 x86_init.iommu.iommu_init();
133
134 for (p = __iommu_table; p < __iommu_table_end; p++) {
135 if (p && (p->flags & IOMMU_DETECTED) && p->late_init)
136 p->late_init();
137 }
138
139 return 0;
140}
141/* Must execute after PCI subsystem */
142rootfs_initcall(pci_iommu_init);
143
144#ifdef CONFIG_PCI
145/* Many VIA bridges seem to corrupt data for DAC. Disable it here */
146
147static int via_no_dac_cb(struct pci_dev *pdev, void *data)
148{
149 pdev->dev.bus_dma_mask = DMA_BIT_MASK(32);
150 return 0;
151}
152
153static void via_no_dac(struct pci_dev *dev)
154{
155 if (!disable_dac_quirk) {
156 dev_info(&dev->dev, "disabling DAC on VIA PCI bridge\n");
157 pci_walk_bus(dev->subordinate, via_no_dac_cb, NULL);
158 }
159}
160DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID,
161 PCI_CLASS_BRIDGE_PCI, 8, via_no_dac);
162#endif
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/dma-direct.h>
3#include <linux/dma-debug.h>
4#include <linux/iommu.h>
5#include <linux/dmar.h>
6#include <linux/export.h>
7#include <linux/memblock.h>
8#include <linux/gfp.h>
9#include <linux/pci.h>
10
11#include <asm/proto.h>
12#include <asm/dma.h>
13#include <asm/iommu.h>
14#include <asm/gart.h>
15#include <asm/x86_init.h>
16#include <asm/iommu_table.h>
17
18static bool disable_dac_quirk __read_mostly;
19
20const struct dma_map_ops *dma_ops;
21EXPORT_SYMBOL(dma_ops);
22
23#ifdef CONFIG_IOMMU_DEBUG
24int panic_on_overflow __read_mostly = 1;
25int force_iommu __read_mostly = 1;
26#else
27int panic_on_overflow __read_mostly = 0;
28int force_iommu __read_mostly = 0;
29#endif
30
31int iommu_merge __read_mostly = 0;
32
33int no_iommu __read_mostly;
34/* Set this to 1 if there is a HW IOMMU in the system */
35int iommu_detected __read_mostly = 0;
36
37extern struct iommu_table_entry __iommu_table[], __iommu_table_end[];
38
39void __init pci_iommu_alloc(void)
40{
41 struct iommu_table_entry *p;
42
43 sort_iommu_table(__iommu_table, __iommu_table_end);
44 check_iommu_entries(__iommu_table, __iommu_table_end);
45
46 for (p = __iommu_table; p < __iommu_table_end; p++) {
47 if (p && p->detect && p->detect() > 0) {
48 p->flags |= IOMMU_DETECTED;
49 if (p->early_init)
50 p->early_init();
51 if (p->flags & IOMMU_FINISH_IF_DETECTED)
52 break;
53 }
54 }
55}
56
57/*
58 * See <Documentation/x86/x86_64/boot-options.rst> for the iommu kernel
59 * parameter documentation.
60 */
61static __init int iommu_setup(char *p)
62{
63 iommu_merge = 1;
64
65 if (!p)
66 return -EINVAL;
67
68 while (*p) {
69 if (!strncmp(p, "off", 3))
70 no_iommu = 1;
71 /* gart_parse_options has more force support */
72 if (!strncmp(p, "force", 5))
73 force_iommu = 1;
74 if (!strncmp(p, "noforce", 7)) {
75 iommu_merge = 0;
76 force_iommu = 0;
77 }
78
79 if (!strncmp(p, "biomerge", 8)) {
80 iommu_merge = 1;
81 force_iommu = 1;
82 }
83 if (!strncmp(p, "panic", 5))
84 panic_on_overflow = 1;
85 if (!strncmp(p, "nopanic", 7))
86 panic_on_overflow = 0;
87 if (!strncmp(p, "merge", 5)) {
88 iommu_merge = 1;
89 force_iommu = 1;
90 }
91 if (!strncmp(p, "nomerge", 7))
92 iommu_merge = 0;
93 if (!strncmp(p, "forcesac", 8))
94 pr_warn("forcesac option ignored.\n");
95 if (!strncmp(p, "allowdac", 8))
96 pr_warn("allowdac option ignored.\n");
97 if (!strncmp(p, "nodac", 5))
98 pr_warn("nodac option ignored.\n");
99 if (!strncmp(p, "usedac", 6)) {
100 disable_dac_quirk = true;
101 return 1;
102 }
103#ifdef CONFIG_SWIOTLB
104 if (!strncmp(p, "soft", 4))
105 swiotlb = 1;
106#endif
107 if (!strncmp(p, "pt", 2))
108 iommu_set_default_passthrough(true);
109 if (!strncmp(p, "nopt", 4))
110 iommu_set_default_translated(true);
111
112 gart_parse_options(p);
113
114 p += strcspn(p, ",");
115 if (*p == ',')
116 ++p;
117 }
118 return 0;
119}
120early_param("iommu", iommu_setup);
121
122static int __init pci_iommu_init(void)
123{
124 struct iommu_table_entry *p;
125
126 x86_init.iommu.iommu_init();
127
128 for (p = __iommu_table; p < __iommu_table_end; p++) {
129 if (p && (p->flags & IOMMU_DETECTED) && p->late_init)
130 p->late_init();
131 }
132
133 return 0;
134}
135/* Must execute after PCI subsystem */
136rootfs_initcall(pci_iommu_init);
137
138#ifdef CONFIG_PCI
139/* Many VIA bridges seem to corrupt data for DAC. Disable it here */
140
141static int via_no_dac_cb(struct pci_dev *pdev, void *data)
142{
143 pdev->dev.bus_dma_limit = DMA_BIT_MASK(32);
144 return 0;
145}
146
147static void via_no_dac(struct pci_dev *dev)
148{
149 if (!disable_dac_quirk) {
150 dev_info(&dev->dev, "disabling DAC on VIA PCI bridge\n");
151 pci_walk_bus(dev->subordinate, via_no_dac_cb, NULL);
152 }
153}
154DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID,
155 PCI_CLASS_BRIDGE_PCI, 8, via_no_dac);
156#endif