Commit | Line | Data |
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ad3ad3f6 | 1 | #include <linux/dmar.h> |
2ae21010 SS |
2 | #include <linux/spinlock.h> |
3 | #include <linux/jiffies.h> | |
4 | #include <linux/pci.h> | |
ad3ad3f6 SS |
5 | #include <asm/io_apic.h> |
6 | #include "intel-iommu.h" | |
7 | #include "intr_remapping.h" | |
8 | ||
9 | static struct ioapic_scope ir_ioapic[MAX_IO_APICS]; | |
10 | static int ir_ioapic_num; | |
2ae21010 SS |
11 | int intr_remapping_enabled; |
12 | ||
13 | static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode) | |
14 | { | |
15 | u64 addr; | |
16 | u32 cmd, sts; | |
17 | unsigned long flags; | |
18 | ||
19 | addr = virt_to_phys((void *)iommu->ir_table->base); | |
20 | ||
21 | spin_lock_irqsave(&iommu->register_lock, flags); | |
22 | ||
23 | dmar_writeq(iommu->reg + DMAR_IRTA_REG, | |
24 | (addr) | IR_X2APIC_MODE(mode) | INTR_REMAP_TABLE_REG_SIZE); | |
25 | ||
26 | /* Set interrupt-remapping table pointer */ | |
27 | cmd = iommu->gcmd | DMA_GCMD_SIRTP; | |
28 | writel(cmd, iommu->reg + DMAR_GCMD_REG); | |
29 | ||
30 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, | |
31 | readl, (sts & DMA_GSTS_IRTPS), sts); | |
32 | spin_unlock_irqrestore(&iommu->register_lock, flags); | |
33 | ||
34 | /* | |
35 | * global invalidation of interrupt entry cache before enabling | |
36 | * interrupt-remapping. | |
37 | */ | |
38 | qi_global_iec(iommu); | |
39 | ||
40 | spin_lock_irqsave(&iommu->register_lock, flags); | |
41 | ||
42 | /* Enable interrupt-remapping */ | |
43 | cmd = iommu->gcmd | DMA_GCMD_IRE; | |
44 | iommu->gcmd |= DMA_GCMD_IRE; | |
45 | writel(cmd, iommu->reg + DMAR_GCMD_REG); | |
46 | ||
47 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, | |
48 | readl, (sts & DMA_GSTS_IRES), sts); | |
49 | ||
50 | spin_unlock_irqrestore(&iommu->register_lock, flags); | |
51 | } | |
52 | ||
53 | ||
54 | static int setup_intr_remapping(struct intel_iommu *iommu, int mode) | |
55 | { | |
56 | struct ir_table *ir_table; | |
57 | struct page *pages; | |
58 | ||
59 | ir_table = iommu->ir_table = kzalloc(sizeof(struct ir_table), | |
60 | GFP_KERNEL); | |
61 | ||
62 | if (!iommu->ir_table) | |
63 | return -ENOMEM; | |
64 | ||
65 | pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, INTR_REMAP_PAGE_ORDER); | |
66 | ||
67 | if (!pages) { | |
68 | printk(KERN_ERR "failed to allocate pages of order %d\n", | |
69 | INTR_REMAP_PAGE_ORDER); | |
70 | kfree(iommu->ir_table); | |
71 | return -ENOMEM; | |
72 | } | |
73 | ||
74 | ir_table->base = page_address(pages); | |
75 | ||
76 | iommu_set_intr_remapping(iommu, mode); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | int __init enable_intr_remapping(int eim) | |
81 | { | |
82 | struct dmar_drhd_unit *drhd; | |
83 | int setup = 0; | |
84 | ||
85 | /* | |
86 | * check for the Interrupt-remapping support | |
87 | */ | |
88 | for_each_drhd_unit(drhd) { | |
89 | struct intel_iommu *iommu = drhd->iommu; | |
90 | ||
91 | if (!ecap_ir_support(iommu->ecap)) | |
92 | continue; | |
93 | ||
94 | if (eim && !ecap_eim_support(iommu->ecap)) { | |
95 | printk(KERN_INFO "DRHD %Lx: EIM not supported by DRHD, " | |
96 | " ecap %Lx\n", drhd->reg_base_addr, iommu->ecap); | |
97 | return -1; | |
98 | } | |
99 | } | |
100 | ||
101 | /* | |
102 | * Enable queued invalidation for all the DRHD's. | |
103 | */ | |
104 | for_each_drhd_unit(drhd) { | |
105 | int ret; | |
106 | struct intel_iommu *iommu = drhd->iommu; | |
107 | ret = dmar_enable_qi(iommu); | |
108 | ||
109 | if (ret) { | |
110 | printk(KERN_ERR "DRHD %Lx: failed to enable queued, " | |
111 | " invalidation, ecap %Lx, ret %d\n", | |
112 | drhd->reg_base_addr, iommu->ecap, ret); | |
113 | return -1; | |
114 | } | |
115 | } | |
116 | ||
117 | /* | |
118 | * Setup Interrupt-remapping for all the DRHD's now. | |
119 | */ | |
120 | for_each_drhd_unit(drhd) { | |
121 | struct intel_iommu *iommu = drhd->iommu; | |
122 | ||
123 | if (!ecap_ir_support(iommu->ecap)) | |
124 | continue; | |
125 | ||
126 | if (setup_intr_remapping(iommu, eim)) | |
127 | goto error; | |
128 | ||
129 | setup = 1; | |
130 | } | |
131 | ||
132 | if (!setup) | |
133 | goto error; | |
134 | ||
135 | intr_remapping_enabled = 1; | |
136 | ||
137 | return 0; | |
138 | ||
139 | error: | |
140 | /* | |
141 | * handle error condition gracefully here! | |
142 | */ | |
143 | return -1; | |
144 | } | |
ad3ad3f6 SS |
145 | |
146 | static int ir_parse_ioapic_scope(struct acpi_dmar_header *header, | |
147 | struct intel_iommu *iommu) | |
148 | { | |
149 | struct acpi_dmar_hardware_unit *drhd; | |
150 | struct acpi_dmar_device_scope *scope; | |
151 | void *start, *end; | |
152 | ||
153 | drhd = (struct acpi_dmar_hardware_unit *)header; | |
154 | ||
155 | start = (void *)(drhd + 1); | |
156 | end = ((void *)drhd) + header->length; | |
157 | ||
158 | while (start < end) { | |
159 | scope = start; | |
160 | if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_IOAPIC) { | |
161 | if (ir_ioapic_num == MAX_IO_APICS) { | |
162 | printk(KERN_WARNING "Exceeded Max IO APICS\n"); | |
163 | return -1; | |
164 | } | |
165 | ||
166 | printk(KERN_INFO "IOAPIC id %d under DRHD base" | |
167 | " 0x%Lx\n", scope->enumeration_id, | |
168 | drhd->address); | |
169 | ||
170 | ir_ioapic[ir_ioapic_num].iommu = iommu; | |
171 | ir_ioapic[ir_ioapic_num].id = scope->enumeration_id; | |
172 | ir_ioapic_num++; | |
173 | } | |
174 | start += scope->length; | |
175 | } | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
180 | /* | |
181 | * Finds the assocaition between IOAPIC's and its Interrupt-remapping | |
182 | * hardware unit. | |
183 | */ | |
184 | int __init parse_ioapics_under_ir(void) | |
185 | { | |
186 | struct dmar_drhd_unit *drhd; | |
187 | int ir_supported = 0; | |
188 | ||
189 | for_each_drhd_unit(drhd) { | |
190 | struct intel_iommu *iommu = drhd->iommu; | |
191 | ||
192 | if (ecap_ir_support(iommu->ecap)) { | |
193 | if (ir_parse_ioapic_scope(drhd->hdr, iommu)) | |
194 | return -1; | |
195 | ||
196 | ir_supported = 1; | |
197 | } | |
198 | } | |
199 | ||
200 | if (ir_supported && ir_ioapic_num != nr_ioapics) { | |
201 | printk(KERN_WARNING | |
202 | "Not all IO-APIC's listed under remapping hardware\n"); | |
203 | return -1; | |
204 | } | |
205 | ||
206 | return ir_supported; | |
207 | } |