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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
c140df97 | 2 | /* |
1da177e4 | 3 | * Firmware replacement code. |
c140df97 | 4 | * |
8caac563 PM |
5 | * Work around broken BIOSes that don't set an aperture, only set the |
6 | * aperture in the AGP bridge, or set too small aperture. | |
7 | * | |
c140df97 IM |
8 | * If all fails map the aperture over some low memory. This is cheaper than |
9 | * doing bounce buffering. The memory is lost. This is done at early boot | |
10 | * because only the bootmem allocator can allocate 32+MB. | |
11 | * | |
1da177e4 | 12 | * Copyright 2002 Andi Kleen, SuSE Labs. |
1da177e4 | 13 | */ |
a5d3244a BH |
14 | #define pr_fmt(fmt) "AGP: " fmt |
15 | ||
1da177e4 LT |
16 | #include <linux/kernel.h> |
17 | #include <linux/types.h> | |
18 | #include <linux/init.h> | |
32e3f2b0 | 19 | #include <linux/memblock.h> |
1da177e4 LT |
20 | #include <linux/mmzone.h> |
21 | #include <linux/pci_ids.h> | |
22 | #include <linux/pci.h> | |
23 | #include <linux/bitops.h> | |
2050d45d | 24 | #include <linux/suspend.h> |
66441bd3 | 25 | #include <asm/e820/api.h> |
1da177e4 | 26 | #include <asm/io.h> |
46a7fa27 | 27 | #include <asm/iommu.h> |
395624fc | 28 | #include <asm/gart.h> |
1da177e4 | 29 | #include <asm/pci-direct.h> |
ca8642f6 | 30 | #include <asm/dma.h> |
23ac4ae8 | 31 | #include <asm/amd_nb.h> |
de957628 | 32 | #include <asm/x86_init.h> |
2fdc5c53 | 33 | #include <linux/crash_dump.h> |
1da177e4 | 34 | |
c387aa3a JR |
35 | /* |
36 | * Using 512M as goal, in case kexec will load kernel_big | |
37 | * that will do the on-position decompress, and could overlap with | |
38 | * with the gart aperture that is used. | |
39 | * Sequence: | |
40 | * kernel_small | |
41 | * ==> kexec (with kdump trigger path or gart still enabled) | |
42 | * ==> kernel_small (gart area become e820_reserved) | |
43 | * ==> kexec (with kdump trigger path or gart still enabled) | |
44 | * ==> kerne_big (uncompressed size will be big than 64M or 128M) | |
45 | * So don't use 512M below as gart iommu, leave the space for kernel | |
46 | * code for safe. | |
47 | */ | |
48 | #define GART_MIN_ADDR (512ULL << 20) | |
49 | #define GART_MAX_ADDR (1ULL << 32) | |
50 | ||
0440d4c0 | 51 | int gart_iommu_aperture; |
7de6a4cd PM |
52 | int gart_iommu_aperture_disabled __initdata; |
53 | int gart_iommu_aperture_allowed __initdata; | |
1da177e4 LT |
54 | |
55 | int fallback_aper_order __initdata = 1; /* 64MB */ | |
7de6a4cd | 56 | int fallback_aper_force __initdata; |
1da177e4 LT |
57 | |
58 | int fix_aperture __initdata = 1; | |
59 | ||
2fdc5c53 JB |
60 | #ifdef CONFIG_PROC_VMCORE |
61 | /* | |
62 | * If the first kernel maps the aperture over e820 RAM, the kdump kernel will | |
63 | * use the same range because it will remain configured in the northbridge. | |
64 | * Trying to dump this area via /proc/vmcore may crash the machine, so exclude | |
65 | * it from vmcore. | |
66 | */ | |
67 | static unsigned long aperture_pfn_start, aperture_page_count; | |
68 | ||
69 | static int gart_oldmem_pfn_is_ram(unsigned long pfn) | |
70 | { | |
71 | return likely((pfn < aperture_pfn_start) || | |
72 | (pfn >= aperture_pfn_start + aperture_page_count)); | |
73 | } | |
74 | ||
75 | static void exclude_from_vmcore(u64 aper_base, u32 aper_order) | |
76 | { | |
77 | aperture_pfn_start = aper_base >> PAGE_SHIFT; | |
78 | aperture_page_count = (32 * 1024 * 1024) << aper_order >> PAGE_SHIFT; | |
79 | WARN_ON(register_oldmem_pfn_is_ram(&gart_oldmem_pfn_is_ram)); | |
80 | } | |
81 | #else | |
82 | static void exclude_from_vmcore(u64 aper_base, u32 aper_order) | |
83 | { | |
84 | } | |
85 | #endif | |
86 | ||
42442ed5 AM |
87 | /* This code runs before the PCI subsystem is initialized, so just |
88 | access the northbridge directly. */ | |
1da177e4 | 89 | |
c140df97 | 90 | static u32 __init allocate_aperture(void) |
1da177e4 | 91 | { |
1da177e4 | 92 | u32 aper_size; |
32e3f2b0 | 93 | unsigned long addr; |
1da177e4 | 94 | |
7677b2ef YL |
95 | /* aper_size should <= 1G */ |
96 | if (fallback_aper_order > 5) | |
97 | fallback_aper_order = 5; | |
c140df97 | 98 | aper_size = (32 * 1024 * 1024) << fallback_aper_order; |
1da177e4 | 99 | |
c140df97 IM |
100 | /* |
101 | * Aperture has to be naturally aligned. This means a 2GB aperture | |
102 | * won't have much chance of finding a place in the lower 4GB of | |
103 | * memory. Unfortunately we cannot move it up because that would | |
104 | * make the IOMMU useless. | |
1da177e4 | 105 | */ |
c387aa3a JR |
106 | addr = memblock_find_in_range(GART_MIN_ADDR, GART_MAX_ADDR, |
107 | aper_size, aper_size); | |
26bfc540 | 108 | if (!addr) { |
c96ec953 BH |
109 | pr_err("Cannot allocate aperture memory hole [mem %#010lx-%#010lx] (%uKB)\n", |
110 | addr, addr + aper_size - 1, aper_size >> 10); | |
32e3f2b0 YL |
111 | return 0; |
112 | } | |
24aa0788 | 113 | memblock_reserve(addr, aper_size); |
c96ec953 BH |
114 | pr_info("Mapping aperture over RAM [mem %#010lx-%#010lx] (%uKB)\n", |
115 | addr, addr + aper_size - 1, aper_size >> 10); | |
32e3f2b0 YL |
116 | register_nosave_region(addr >> PAGE_SHIFT, |
117 | (addr+aper_size) >> PAGE_SHIFT); | |
c140df97 | 118 | |
32e3f2b0 | 119 | return (u32)addr; |
1da177e4 LT |
120 | } |
121 | ||
1da177e4 | 122 | |
1da177e4 | 123 | /* Read a standard AGPv3 bridge header */ |
dd564d0c | 124 | static u32 __init read_agp(int bus, int slot, int func, int cap, u32 *order) |
c140df97 | 125 | { |
1da177e4 LT |
126 | u32 apsize; |
127 | u32 apsizereg; | |
128 | int nbits; | |
129 | u32 aper_low, aper_hi; | |
130 | u64 aper; | |
1edc1ab3 | 131 | u32 old_order; |
1da177e4 | 132 | |
c96ec953 | 133 | pr_info("pci 0000:%02x:%02x:%02x: AGP bridge\n", bus, slot, func); |
55c0d721 | 134 | apsizereg = read_pci_config_16(bus, slot, func, cap + 0x14); |
1da177e4 | 135 | if (apsizereg == 0xffffffff) { |
c96ec953 BH |
136 | pr_err("pci 0000:%02x:%02x.%d: APSIZE unreadable\n", |
137 | bus, slot, func); | |
1da177e4 LT |
138 | return 0; |
139 | } | |
140 | ||
1edc1ab3 YL |
141 | /* old_order could be the value from NB gart setting */ |
142 | old_order = *order; | |
143 | ||
1da177e4 LT |
144 | apsize = apsizereg & 0xfff; |
145 | /* Some BIOS use weird encodings not in the AGPv3 table. */ | |
c140df97 IM |
146 | if (apsize & 0xff) |
147 | apsize |= 0xf00; | |
1da177e4 LT |
148 | nbits = hweight16(apsize); |
149 | *order = 7 - nbits; | |
150 | if ((int)*order < 0) /* < 32MB */ | |
151 | *order = 0; | |
c140df97 | 152 | |
55c0d721 YL |
153 | aper_low = read_pci_config(bus, slot, func, 0x10); |
154 | aper_hi = read_pci_config(bus, slot, func, 0x14); | |
1da177e4 LT |
155 | aper = (aper_low & ~((1<<22)-1)) | ((u64)aper_hi << 32); |
156 | ||
1edc1ab3 YL |
157 | /* |
158 | * On some sick chips, APSIZE is 0. It means it wants 4G | |
159 | * so let double check that order, and lets trust AMD NB settings: | |
160 | */ | |
c96ec953 BH |
161 | pr_info("pci 0000:%02x:%02x.%d: AGP aperture [bus addr %#010Lx-%#010Lx] (old size %uMB)\n", |
162 | bus, slot, func, aper, aper + (32ULL << (old_order + 20)) - 1, | |
163 | 32 << old_order); | |
8c9fd91a | 164 | if (aper + (32ULL<<(20 + *order)) > 0x100000000ULL) { |
c96ec953 BH |
165 | pr_info("pci 0000:%02x:%02x.%d: AGP aperture size %uMB (APSIZE %#x) is not right, using settings from NB\n", |
166 | bus, slot, func, 32 << *order, apsizereg); | |
1edc1ab3 YL |
167 | *order = old_order; |
168 | } | |
169 | ||
c96ec953 BH |
170 | pr_info("pci 0000:%02x:%02x.%d: AGP aperture [bus addr %#010Lx-%#010Lx] (%uMB, APSIZE %#x)\n", |
171 | bus, slot, func, aper, aper + (32ULL << (*order + 20)) - 1, | |
a5d3244a | 172 | 32 << *order, apsizereg); |
1da177e4 | 173 | |
8c9fd91a | 174 | if (!aperture_valid(aper, (32*1024*1024) << *order, 32<<20)) |
c140df97 IM |
175 | return 0; |
176 | return (u32)aper; | |
177 | } | |
1da177e4 | 178 | |
c140df97 IM |
179 | /* |
180 | * Look for an AGP bridge. Windows only expects the aperture in the | |
181 | * AGP bridge and some BIOS forget to initialize the Northbridge too. | |
182 | * Work around this here. | |
183 | * | |
184 | * Do an PCI bus scan by hand because we're running before the PCI | |
185 | * subsystem. | |
186 | * | |
eec1d4fa | 187 | * All AMD AGP bridges are AGPv3 compliant, so we can do this scan |
c140df97 IM |
188 | * generically. It's probably overkill to always scan all slots because |
189 | * the AGP bridges should be always an own bus on the HT hierarchy, | |
190 | * but do it here for future safety. | |
191 | */ | |
dd564d0c | 192 | static u32 __init search_agp_bridge(u32 *order, int *valid_agp) |
1da177e4 | 193 | { |
55c0d721 | 194 | int bus, slot, func; |
1da177e4 LT |
195 | |
196 | /* Poor man's PCI discovery */ | |
55c0d721 | 197 | for (bus = 0; bus < 256; bus++) { |
c140df97 IM |
198 | for (slot = 0; slot < 32; slot++) { |
199 | for (func = 0; func < 8; func++) { | |
1da177e4 LT |
200 | u32 class, cap; |
201 | u8 type; | |
55c0d721 | 202 | class = read_pci_config(bus, slot, func, |
1da177e4 LT |
203 | PCI_CLASS_REVISION); |
204 | if (class == 0xffffffff) | |
c140df97 IM |
205 | break; |
206 | ||
207 | switch (class >> 16) { | |
1da177e4 LT |
208 | case PCI_CLASS_BRIDGE_HOST: |
209 | case PCI_CLASS_BRIDGE_OTHER: /* needed? */ | |
210 | /* AGP bridge? */ | |
12c961ac GP |
211 | cap = pci_early_find_cap(bus, slot, |
212 | func, PCI_CAP_ID_AGP); | |
1da177e4 LT |
213 | if (!cap) |
214 | break; | |
c140df97 | 215 | *valid_agp = 1; |
55c0d721 | 216 | return read_agp(bus, slot, func, cap, |
c140df97 IM |
217 | order); |
218 | } | |
219 | ||
1da177e4 | 220 | /* No multi-function device? */ |
55c0d721 | 221 | type = read_pci_config_byte(bus, slot, func, |
1da177e4 LT |
222 | PCI_HEADER_TYPE); |
223 | if (!(type & 0x80)) | |
224 | break; | |
c140df97 IM |
225 | } |
226 | } | |
1da177e4 | 227 | } |
a5d3244a | 228 | pr_info("No AGP bridge found\n"); |
c140df97 | 229 | |
1da177e4 LT |
230 | return 0; |
231 | } | |
232 | ||
4cc7ecb7 | 233 | static bool gart_fix_e820 __initdata = true; |
aaf23042 YL |
234 | |
235 | static int __init parse_gart_mem(char *p) | |
236 | { | |
4cc7ecb7 | 237 | return kstrtobool(p, &gart_fix_e820); |
aaf23042 YL |
238 | } |
239 | early_param("gart_fix_e820", parse_gart_mem); | |
240 | ||
241 | void __init early_gart_iommu_check(void) | |
242 | { | |
243 | /* | |
244 | * in case it is enabled before, esp for kexec/kdump, | |
245 | * previous kernel already enable that. memset called | |
246 | * by allocate_aperture/__alloc_bootmem_nopanic cause restart. | |
247 | * or second kernel have different position for GART hole. and new | |
248 | * kernel could use hole as RAM that is still used by GART set by | |
249 | * first kernel | |
250 | * or BIOS forget to put that in reserved. | |
251 | * try to update e820 to make that region as reserved. | |
252 | */ | |
fa10ba64 | 253 | u32 agp_aper_order = 0; |
f3eee542 | 254 | int i, fix, slot, valid_agp = 0; |
aaf23042 YL |
255 | u32 ctl; |
256 | u32 aper_size = 0, aper_order = 0, last_aper_order = 0; | |
257 | u64 aper_base = 0, last_aper_base = 0; | |
fa5b8a30 | 258 | int aper_enabled = 0, last_aper_enabled = 0, last_valid = 0; |
aaf23042 | 259 | |
1b457429 AG |
260 | if (!amd_gart_present()) |
261 | return; | |
262 | ||
aaf23042 YL |
263 | if (!early_pci_allowed()) |
264 | return; | |
265 | ||
fa5b8a30 | 266 | /* This is mostly duplicate of iommu_hole_init */ |
fa10ba64 | 267 | search_agp_bridge(&agp_aper_order, &valid_agp); |
f3eee542 | 268 | |
aaf23042 | 269 | fix = 0; |
24d9b70b | 270 | for (i = 0; amd_nb_bus_dev_ranges[i].dev_limit; i++) { |
55c0d721 YL |
271 | int bus; |
272 | int dev_base, dev_limit; | |
273 | ||
24d9b70b JB |
274 | bus = amd_nb_bus_dev_ranges[i].bus; |
275 | dev_base = amd_nb_bus_dev_ranges[i].dev_base; | |
276 | dev_limit = amd_nb_bus_dev_ranges[i].dev_limit; | |
55c0d721 YL |
277 | |
278 | for (slot = dev_base; slot < dev_limit; slot++) { | |
eec1d4fa | 279 | if (!early_is_amd_nb(read_pci_config(bus, slot, 3, 0x00))) |
55c0d721 YL |
280 | continue; |
281 | ||
282 | ctl = read_pci_config(bus, slot, 3, AMD64_GARTAPERTURECTL); | |
57ab43e3 | 283 | aper_enabled = ctl & GARTEN; |
55c0d721 YL |
284 | aper_order = (ctl >> 1) & 7; |
285 | aper_size = (32 * 1024 * 1024) << aper_order; | |
286 | aper_base = read_pci_config(bus, slot, 3, AMD64_GARTAPERTUREBASE) & 0x7fff; | |
287 | aper_base <<= 25; | |
288 | ||
fa5b8a30 PM |
289 | if (last_valid) { |
290 | if ((aper_order != last_aper_order) || | |
291 | (aper_base != last_aper_base) || | |
292 | (aper_enabled != last_aper_enabled)) { | |
293 | fix = 1; | |
294 | break; | |
295 | } | |
55c0d721 | 296 | } |
fa5b8a30 | 297 | |
55c0d721 YL |
298 | last_aper_order = aper_order; |
299 | last_aper_base = aper_base; | |
300 | last_aper_enabled = aper_enabled; | |
fa5b8a30 | 301 | last_valid = 1; |
aaf23042 | 302 | } |
aaf23042 YL |
303 | } |
304 | ||
305 | if (!fix && !aper_enabled) | |
306 | return; | |
307 | ||
308 | if (!aper_base || !aper_size || aper_base + aper_size > 0x100000000UL) | |
309 | fix = 1; | |
310 | ||
311 | if (gart_fix_e820 && !fix && aper_enabled) { | |
3bce64f0 | 312 | if (e820__mapped_any(aper_base, aper_base + aper_size, |
09821ff1 | 313 | E820_TYPE_RAM)) { |
0abbc78a | 314 | /* reserve it, so we can reuse it in second kernel */ |
c96ec953 BH |
315 | pr_info("e820: reserve [mem %#010Lx-%#010Lx] for GART\n", |
316 | aper_base, aper_base + aper_size - 1); | |
09821ff1 | 317 | e820__range_add(aper_base, aper_size, E820_TYPE_RESERVED); |
6464d294 | 318 | e820__update_table_print(); |
aaf23042 | 319 | } |
aaf23042 YL |
320 | } |
321 | ||
f3eee542 | 322 | if (valid_agp) |
4f384f8b PM |
323 | return; |
324 | ||
f3eee542 | 325 | /* disable them all at first */ |
24d9b70b | 326 | for (i = 0; i < amd_nb_bus_dev_ranges[i].dev_limit; i++) { |
55c0d721 YL |
327 | int bus; |
328 | int dev_base, dev_limit; | |
329 | ||
24d9b70b JB |
330 | bus = amd_nb_bus_dev_ranges[i].bus; |
331 | dev_base = amd_nb_bus_dev_ranges[i].dev_base; | |
332 | dev_limit = amd_nb_bus_dev_ranges[i].dev_limit; | |
aaf23042 | 333 | |
55c0d721 | 334 | for (slot = dev_base; slot < dev_limit; slot++) { |
eec1d4fa | 335 | if (!early_is_amd_nb(read_pci_config(bus, slot, 3, 0x00))) |
55c0d721 YL |
336 | continue; |
337 | ||
338 | ctl = read_pci_config(bus, slot, 3, AMD64_GARTAPERTURECTL); | |
57ab43e3 | 339 | ctl &= ~GARTEN; |
55c0d721 YL |
340 | write_pci_config(bus, slot, 3, AMD64_GARTAPERTURECTL, ctl); |
341 | } | |
aaf23042 YL |
342 | } |
343 | ||
344 | } | |
345 | ||
8c9fd91a YL |
346 | static int __initdata printed_gart_size_msg; |
347 | ||
480125ba | 348 | int __init gart_iommu_hole_init(void) |
c140df97 | 349 | { |
8c9fd91a | 350 | u32 agp_aper_base = 0, agp_aper_order = 0; |
50895c5d | 351 | u32 aper_size, aper_alloc = 0, aper_order = 0, last_aper_order = 0; |
1da177e4 | 352 | u64 aper_base, last_aper_base = 0; |
55c0d721 YL |
353 | int fix, slot, valid_agp = 0; |
354 | int i, node; | |
1da177e4 | 355 | |
1b457429 AG |
356 | if (!amd_gart_present()) |
357 | return -ENODEV; | |
358 | ||
0440d4c0 JR |
359 | if (gart_iommu_aperture_disabled || !fix_aperture || |
360 | !early_pci_allowed()) | |
480125ba | 361 | return -ENODEV; |
1da177e4 | 362 | |
a5d3244a | 363 | pr_info("Checking aperture...\n"); |
1da177e4 | 364 | |
8c9fd91a YL |
365 | if (!fallback_aper_force) |
366 | agp_aper_base = search_agp_bridge(&agp_aper_order, &valid_agp); | |
367 | ||
1da177e4 | 368 | fix = 0; |
47db4c3e | 369 | node = 0; |
24d9b70b | 370 | for (i = 0; i < amd_nb_bus_dev_ranges[i].dev_limit; i++) { |
55c0d721 YL |
371 | int bus; |
372 | int dev_base, dev_limit; | |
4b83873d | 373 | u32 ctl; |
55c0d721 | 374 | |
24d9b70b JB |
375 | bus = amd_nb_bus_dev_ranges[i].bus; |
376 | dev_base = amd_nb_bus_dev_ranges[i].dev_base; | |
377 | dev_limit = amd_nb_bus_dev_ranges[i].dev_limit; | |
55c0d721 YL |
378 | |
379 | for (slot = dev_base; slot < dev_limit; slot++) { | |
eec1d4fa | 380 | if (!early_is_amd_nb(read_pci_config(bus, slot, 3, 0x00))) |
55c0d721 YL |
381 | continue; |
382 | ||
383 | iommu_detected = 1; | |
384 | gart_iommu_aperture = 1; | |
de957628 | 385 | x86_init.iommu.iommu_init = gart_iommu_init; |
55c0d721 | 386 | |
4b83873d JR |
387 | ctl = read_pci_config(bus, slot, 3, |
388 | AMD64_GARTAPERTURECTL); | |
389 | ||
390 | /* | |
391 | * Before we do anything else disable the GART. It may | |
392 | * still be enabled if we boot into a crash-kernel here. | |
393 | * Reconfiguring the GART while it is enabled could have | |
394 | * unknown side-effects. | |
395 | */ | |
396 | ctl &= ~GARTEN; | |
397 | write_pci_config(bus, slot, 3, AMD64_GARTAPERTURECTL, ctl); | |
398 | ||
399 | aper_order = (ctl >> 1) & 7; | |
55c0d721 YL |
400 | aper_size = (32 * 1024 * 1024) << aper_order; |
401 | aper_base = read_pci_config(bus, slot, 3, AMD64_GARTAPERTUREBASE) & 0x7fff; | |
402 | aper_base <<= 25; | |
403 | ||
c96ec953 BH |
404 | pr_info("Node %d: aperture [bus addr %#010Lx-%#010Lx] (%uMB)\n", |
405 | node, aper_base, aper_base + aper_size - 1, | |
406 | aper_size >> 20); | |
55c0d721 YL |
407 | node++; |
408 | ||
409 | if (!aperture_valid(aper_base, aper_size, 64<<20)) { | |
410 | if (valid_agp && agp_aper_base && | |
411 | agp_aper_base == aper_base && | |
412 | agp_aper_order == aper_order) { | |
413 | /* the same between two setting from NB and agp */ | |
c987d12f YL |
414 | if (!no_iommu && |
415 | max_pfn > MAX_DMA32_PFN && | |
416 | !printed_gart_size_msg) { | |
c96ec953 | 417 | pr_err("you are using iommu with agp, but GART size is less than 64MB\n"); |
a5d3244a BH |
418 | pr_err("please increase GART size in your BIOS setup\n"); |
419 | pr_err("if BIOS doesn't have that option, contact your HW vendor!\n"); | |
55c0d721 YL |
420 | printed_gart_size_msg = 1; |
421 | } | |
422 | } else { | |
423 | fix = 1; | |
424 | goto out; | |
8c9fd91a | 425 | } |
8c9fd91a | 426 | } |
1da177e4 | 427 | |
55c0d721 YL |
428 | if ((last_aper_order && aper_order != last_aper_order) || |
429 | (last_aper_base && aper_base != last_aper_base)) { | |
430 | fix = 1; | |
431 | goto out; | |
432 | } | |
433 | last_aper_order = aper_order; | |
434 | last_aper_base = aper_base; | |
1da177e4 | 435 | } |
c140df97 | 436 | } |
1da177e4 | 437 | |
55c0d721 | 438 | out: |
56dd669a | 439 | if (!fix && !fallback_aper_force) { |
2fdc5c53 JB |
440 | if (last_aper_base) { |
441 | /* | |
442 | * If this is the kdump kernel, the first kernel | |
443 | * may have allocated the range over its e820 RAM | |
444 | * and fixed up the northbridge | |
445 | */ | |
446 | exclude_from_vmcore(last_aper_base, last_aper_order); | |
447 | ||
480125ba | 448 | return 1; |
2fdc5c53 | 449 | } |
480125ba | 450 | return 0; |
56dd669a | 451 | } |
1da177e4 | 452 | |
8c9fd91a YL |
453 | if (!fallback_aper_force) { |
454 | aper_alloc = agp_aper_base; | |
455 | aper_order = agp_aper_order; | |
456 | } | |
c140df97 IM |
457 | |
458 | if (aper_alloc) { | |
1da177e4 | 459 | /* Got the aperture from the AGP bridge */ |
c987d12f | 460 | } else if ((!no_iommu && max_pfn > MAX_DMA32_PFN) || |
1da177e4 LT |
461 | force_iommu || |
462 | valid_agp || | |
c140df97 | 463 | fallback_aper_force) { |
1b457429 | 464 | pr_info("Your BIOS doesn't leave an aperture memory hole\n"); |
a5d3244a | 465 | pr_info("Please enable the IOMMU option in the BIOS setup\n"); |
c96ec953 | 466 | pr_info("This costs you %dMB of RAM\n", |
a5d3244a | 467 | 32 << fallback_aper_order); |
1da177e4 LT |
468 | |
469 | aper_order = fallback_aper_order; | |
470 | aper_alloc = allocate_aperture(); | |
c140df97 IM |
471 | if (!aper_alloc) { |
472 | /* | |
473 | * Could disable AGP and IOMMU here, but it's | |
474 | * probably not worth it. But the later users | |
475 | * cannot deal with bad apertures and turning | |
476 | * on the aperture over memory causes very | |
477 | * strange problems, so it's better to panic | |
478 | * early. | |
479 | */ | |
1da177e4 LT |
480 | panic("Not enough memory for aperture"); |
481 | } | |
c140df97 | 482 | } else { |
480125ba | 483 | return 0; |
c140df97 | 484 | } |
1da177e4 | 485 | |
2fdc5c53 JB |
486 | /* |
487 | * If this is the kdump kernel _and_ the first kernel did not | |
488 | * configure the aperture in the northbridge, this range may | |
489 | * overlap with the first kernel's memory. We can't access the | |
490 | * range through vmcore even though it should be part of the dump. | |
491 | */ | |
492 | exclude_from_vmcore(aper_alloc, aper_order); | |
493 | ||
1da177e4 | 494 | /* Fix up the north bridges */ |
24d9b70b | 495 | for (i = 0; i < amd_nb_bus_dev_ranges[i].dev_limit; i++) { |
260133ab BP |
496 | int bus, dev_base, dev_limit; |
497 | ||
498 | /* | |
499 | * Don't enable translation yet but enable GART IO and CPU | |
500 | * accesses and set DISTLBWALKPRB since GART table memory is UC. | |
501 | */ | |
c34151a7 | 502 | u32 ctl = aper_order << 1; |
55c0d721 | 503 | |
24d9b70b JB |
504 | bus = amd_nb_bus_dev_ranges[i].bus; |
505 | dev_base = amd_nb_bus_dev_ranges[i].dev_base; | |
506 | dev_limit = amd_nb_bus_dev_ranges[i].dev_limit; | |
55c0d721 | 507 | for (slot = dev_base; slot < dev_limit; slot++) { |
eec1d4fa | 508 | if (!early_is_amd_nb(read_pci_config(bus, slot, 3, 0x00))) |
55c0d721 YL |
509 | continue; |
510 | ||
260133ab | 511 | write_pci_config(bus, slot, 3, AMD64_GARTAPERTURECTL, ctl); |
55c0d721 YL |
512 | write_pci_config(bus, slot, 3, AMD64_GARTAPERTUREBASE, aper_alloc >> 25); |
513 | } | |
c140df97 | 514 | } |
6703f6d1 RW |
515 | |
516 | set_up_gart_resume(aper_order, aper_alloc); | |
480125ba KRW |
517 | |
518 | return 1; | |
c140df97 | 519 | } |