Commit | Line | Data |
---|---|---|
c140df97 | 1 | /* |
1da177e4 | 2 | * Firmware replacement code. |
c140df97 | 3 | * |
8caac563 PM |
4 | * Work around broken BIOSes that don't set an aperture, only set the |
5 | * aperture in the AGP bridge, or set too small aperture. | |
6 | * | |
c140df97 IM |
7 | * If all fails map the aperture over some low memory. This is cheaper than |
8 | * doing bounce buffering. The memory is lost. This is done at early boot | |
9 | * because only the bootmem allocator can allocate 32+MB. | |
10 | * | |
1da177e4 | 11 | * Copyright 2002 Andi Kleen, SuSE Labs. |
1da177e4 | 12 | */ |
a5d3244a BH |
13 | #define pr_fmt(fmt) "AGP: " fmt |
14 | ||
1da177e4 LT |
15 | #include <linux/kernel.h> |
16 | #include <linux/types.h> | |
17 | #include <linux/init.h> | |
32e3f2b0 | 18 | #include <linux/memblock.h> |
1da177e4 LT |
19 | #include <linux/mmzone.h> |
20 | #include <linux/pci_ids.h> | |
21 | #include <linux/pci.h> | |
22 | #include <linux/bitops.h> | |
2050d45d | 23 | #include <linux/suspend.h> |
1da177e4 LT |
24 | #include <asm/e820.h> |
25 | #include <asm/io.h> | |
46a7fa27 | 26 | #include <asm/iommu.h> |
395624fc | 27 | #include <asm/gart.h> |
1da177e4 | 28 | #include <asm/pci-direct.h> |
ca8642f6 | 29 | #include <asm/dma.h> |
23ac4ae8 | 30 | #include <asm/amd_nb.h> |
de957628 | 31 | #include <asm/x86_init.h> |
1da177e4 | 32 | |
c387aa3a JR |
33 | /* |
34 | * Using 512M as goal, in case kexec will load kernel_big | |
35 | * that will do the on-position decompress, and could overlap with | |
36 | * with the gart aperture that is used. | |
37 | * Sequence: | |
38 | * kernel_small | |
39 | * ==> kexec (with kdump trigger path or gart still enabled) | |
40 | * ==> kernel_small (gart area become e820_reserved) | |
41 | * ==> kexec (with kdump trigger path or gart still enabled) | |
42 | * ==> kerne_big (uncompressed size will be big than 64M or 128M) | |
43 | * So don't use 512M below as gart iommu, leave the space for kernel | |
44 | * code for safe. | |
45 | */ | |
46 | #define GART_MIN_ADDR (512ULL << 20) | |
47 | #define GART_MAX_ADDR (1ULL << 32) | |
48 | ||
0440d4c0 | 49 | int gart_iommu_aperture; |
7de6a4cd PM |
50 | int gart_iommu_aperture_disabled __initdata; |
51 | int gart_iommu_aperture_allowed __initdata; | |
1da177e4 LT |
52 | |
53 | int fallback_aper_order __initdata = 1; /* 64MB */ | |
7de6a4cd | 54 | int fallback_aper_force __initdata; |
1da177e4 LT |
55 | |
56 | int fix_aperture __initdata = 1; | |
57 | ||
42442ed5 AM |
58 | /* This code runs before the PCI subsystem is initialized, so just |
59 | access the northbridge directly. */ | |
1da177e4 | 60 | |
c140df97 | 61 | static u32 __init allocate_aperture(void) |
1da177e4 | 62 | { |
1da177e4 | 63 | u32 aper_size; |
32e3f2b0 | 64 | unsigned long addr; |
1da177e4 | 65 | |
7677b2ef YL |
66 | /* aper_size should <= 1G */ |
67 | if (fallback_aper_order > 5) | |
68 | fallback_aper_order = 5; | |
c140df97 | 69 | aper_size = (32 * 1024 * 1024) << fallback_aper_order; |
1da177e4 | 70 | |
c140df97 IM |
71 | /* |
72 | * Aperture has to be naturally aligned. This means a 2GB aperture | |
73 | * won't have much chance of finding a place in the lower 4GB of | |
74 | * memory. Unfortunately we cannot move it up because that would | |
75 | * make the IOMMU useless. | |
1da177e4 | 76 | */ |
c387aa3a JR |
77 | addr = memblock_find_in_range(GART_MIN_ADDR, GART_MAX_ADDR, |
78 | aper_size, aper_size); | |
26bfc540 | 79 | if (!addr) { |
c96ec953 BH |
80 | pr_err("Cannot allocate aperture memory hole [mem %#010lx-%#010lx] (%uKB)\n", |
81 | addr, addr + aper_size - 1, aper_size >> 10); | |
32e3f2b0 YL |
82 | return 0; |
83 | } | |
24aa0788 | 84 | memblock_reserve(addr, aper_size); |
c96ec953 BH |
85 | pr_info("Mapping aperture over RAM [mem %#010lx-%#010lx] (%uKB)\n", |
86 | addr, addr + aper_size - 1, aper_size >> 10); | |
32e3f2b0 YL |
87 | register_nosave_region(addr >> PAGE_SHIFT, |
88 | (addr+aper_size) >> PAGE_SHIFT); | |
c140df97 | 89 | |
32e3f2b0 | 90 | return (u32)addr; |
1da177e4 LT |
91 | } |
92 | ||
1da177e4 | 93 | |
42442ed5 | 94 | /* Find a PCI capability */ |
dd564d0c | 95 | static u32 __init find_cap(int bus, int slot, int func, int cap) |
c140df97 | 96 | { |
1da177e4 | 97 | int bytes; |
c140df97 IM |
98 | u8 pos; |
99 | ||
55c0d721 | 100 | if (!(read_pci_config_16(bus, slot, func, PCI_STATUS) & |
c140df97 | 101 | PCI_STATUS_CAP_LIST)) |
1da177e4 | 102 | return 0; |
c140df97 | 103 | |
55c0d721 | 104 | pos = read_pci_config_byte(bus, slot, func, PCI_CAPABILITY_LIST); |
c140df97 | 105 | for (bytes = 0; bytes < 48 && pos >= 0x40; bytes++) { |
1da177e4 | 106 | u8 id; |
c140df97 IM |
107 | |
108 | pos &= ~3; | |
55c0d721 | 109 | id = read_pci_config_byte(bus, slot, func, pos+PCI_CAP_LIST_ID); |
1da177e4 LT |
110 | if (id == 0xff) |
111 | break; | |
c140df97 IM |
112 | if (id == cap) |
113 | return pos; | |
55c0d721 | 114 | pos = read_pci_config_byte(bus, slot, func, |
c140df97 IM |
115 | pos+PCI_CAP_LIST_NEXT); |
116 | } | |
1da177e4 | 117 | return 0; |
c140df97 | 118 | } |
1da177e4 LT |
119 | |
120 | /* Read a standard AGPv3 bridge header */ | |
dd564d0c | 121 | static u32 __init read_agp(int bus, int slot, int func, int cap, u32 *order) |
c140df97 | 122 | { |
1da177e4 LT |
123 | u32 apsize; |
124 | u32 apsizereg; | |
125 | int nbits; | |
126 | u32 aper_low, aper_hi; | |
127 | u64 aper; | |
1edc1ab3 | 128 | u32 old_order; |
1da177e4 | 129 | |
c96ec953 | 130 | pr_info("pci 0000:%02x:%02x:%02x: AGP bridge\n", bus, slot, func); |
55c0d721 | 131 | apsizereg = read_pci_config_16(bus, slot, func, cap + 0x14); |
1da177e4 | 132 | if (apsizereg == 0xffffffff) { |
c96ec953 BH |
133 | pr_err("pci 0000:%02x:%02x.%d: APSIZE unreadable\n", |
134 | bus, slot, func); | |
1da177e4 LT |
135 | return 0; |
136 | } | |
137 | ||
1edc1ab3 YL |
138 | /* old_order could be the value from NB gart setting */ |
139 | old_order = *order; | |
140 | ||
1da177e4 LT |
141 | apsize = apsizereg & 0xfff; |
142 | /* Some BIOS use weird encodings not in the AGPv3 table. */ | |
c140df97 IM |
143 | if (apsize & 0xff) |
144 | apsize |= 0xf00; | |
1da177e4 LT |
145 | nbits = hweight16(apsize); |
146 | *order = 7 - nbits; | |
147 | if ((int)*order < 0) /* < 32MB */ | |
148 | *order = 0; | |
c140df97 | 149 | |
55c0d721 YL |
150 | aper_low = read_pci_config(bus, slot, func, 0x10); |
151 | aper_hi = read_pci_config(bus, slot, func, 0x14); | |
1da177e4 LT |
152 | aper = (aper_low & ~((1<<22)-1)) | ((u64)aper_hi << 32); |
153 | ||
1edc1ab3 YL |
154 | /* |
155 | * On some sick chips, APSIZE is 0. It means it wants 4G | |
156 | * so let double check that order, and lets trust AMD NB settings: | |
157 | */ | |
c96ec953 BH |
158 | pr_info("pci 0000:%02x:%02x.%d: AGP aperture [bus addr %#010Lx-%#010Lx] (old size %uMB)\n", |
159 | bus, slot, func, aper, aper + (32ULL << (old_order + 20)) - 1, | |
160 | 32 << old_order); | |
8c9fd91a | 161 | if (aper + (32ULL<<(20 + *order)) > 0x100000000ULL) { |
c96ec953 BH |
162 | pr_info("pci 0000:%02x:%02x.%d: AGP aperture size %uMB (APSIZE %#x) is not right, using settings from NB\n", |
163 | bus, slot, func, 32 << *order, apsizereg); | |
1edc1ab3 YL |
164 | *order = old_order; |
165 | } | |
166 | ||
c96ec953 BH |
167 | pr_info("pci 0000:%02x:%02x.%d: AGP aperture [bus addr %#010Lx-%#010Lx] (%uMB, APSIZE %#x)\n", |
168 | bus, slot, func, aper, aper + (32ULL << (*order + 20)) - 1, | |
a5d3244a | 169 | 32 << *order, apsizereg); |
1da177e4 | 170 | |
8c9fd91a | 171 | if (!aperture_valid(aper, (32*1024*1024) << *order, 32<<20)) |
c140df97 IM |
172 | return 0; |
173 | return (u32)aper; | |
174 | } | |
1da177e4 | 175 | |
c140df97 IM |
176 | /* |
177 | * Look for an AGP bridge. Windows only expects the aperture in the | |
178 | * AGP bridge and some BIOS forget to initialize the Northbridge too. | |
179 | * Work around this here. | |
180 | * | |
181 | * Do an PCI bus scan by hand because we're running before the PCI | |
182 | * subsystem. | |
183 | * | |
eec1d4fa | 184 | * All AMD AGP bridges are AGPv3 compliant, so we can do this scan |
c140df97 IM |
185 | * generically. It's probably overkill to always scan all slots because |
186 | * the AGP bridges should be always an own bus on the HT hierarchy, | |
187 | * but do it here for future safety. | |
188 | */ | |
dd564d0c | 189 | static u32 __init search_agp_bridge(u32 *order, int *valid_agp) |
1da177e4 | 190 | { |
55c0d721 | 191 | int bus, slot, func; |
1da177e4 LT |
192 | |
193 | /* Poor man's PCI discovery */ | |
55c0d721 | 194 | for (bus = 0; bus < 256; bus++) { |
c140df97 IM |
195 | for (slot = 0; slot < 32; slot++) { |
196 | for (func = 0; func < 8; func++) { | |
1da177e4 LT |
197 | u32 class, cap; |
198 | u8 type; | |
55c0d721 | 199 | class = read_pci_config(bus, slot, func, |
1da177e4 LT |
200 | PCI_CLASS_REVISION); |
201 | if (class == 0xffffffff) | |
c140df97 IM |
202 | break; |
203 | ||
204 | switch (class >> 16) { | |
1da177e4 LT |
205 | case PCI_CLASS_BRIDGE_HOST: |
206 | case PCI_CLASS_BRIDGE_OTHER: /* needed? */ | |
207 | /* AGP bridge? */ | |
55c0d721 | 208 | cap = find_cap(bus, slot, func, |
c140df97 | 209 | PCI_CAP_ID_AGP); |
1da177e4 LT |
210 | if (!cap) |
211 | break; | |
c140df97 | 212 | *valid_agp = 1; |
55c0d721 | 213 | return read_agp(bus, slot, func, cap, |
c140df97 IM |
214 | order); |
215 | } | |
216 | ||
1da177e4 | 217 | /* No multi-function device? */ |
55c0d721 | 218 | type = read_pci_config_byte(bus, slot, func, |
1da177e4 LT |
219 | PCI_HEADER_TYPE); |
220 | if (!(type & 0x80)) | |
221 | break; | |
c140df97 IM |
222 | } |
223 | } | |
1da177e4 | 224 | } |
a5d3244a | 225 | pr_info("No AGP bridge found\n"); |
c140df97 | 226 | |
1da177e4 LT |
227 | return 0; |
228 | } | |
229 | ||
4cc7ecb7 | 230 | static bool gart_fix_e820 __initdata = true; |
aaf23042 YL |
231 | |
232 | static int __init parse_gart_mem(char *p) | |
233 | { | |
4cc7ecb7 | 234 | return kstrtobool(p, &gart_fix_e820); |
aaf23042 YL |
235 | } |
236 | early_param("gart_fix_e820", parse_gart_mem); | |
237 | ||
238 | void __init early_gart_iommu_check(void) | |
239 | { | |
240 | /* | |
241 | * in case it is enabled before, esp for kexec/kdump, | |
242 | * previous kernel already enable that. memset called | |
243 | * by allocate_aperture/__alloc_bootmem_nopanic cause restart. | |
244 | * or second kernel have different position for GART hole. and new | |
245 | * kernel could use hole as RAM that is still used by GART set by | |
246 | * first kernel | |
247 | * or BIOS forget to put that in reserved. | |
248 | * try to update e820 to make that region as reserved. | |
249 | */ | |
fa10ba64 | 250 | u32 agp_aper_order = 0; |
f3eee542 | 251 | int i, fix, slot, valid_agp = 0; |
aaf23042 YL |
252 | u32 ctl; |
253 | u32 aper_size = 0, aper_order = 0, last_aper_order = 0; | |
254 | u64 aper_base = 0, last_aper_base = 0; | |
fa5b8a30 | 255 | int aper_enabled = 0, last_aper_enabled = 0, last_valid = 0; |
aaf23042 | 256 | |
1b457429 AG |
257 | if (!amd_gart_present()) |
258 | return; | |
259 | ||
aaf23042 YL |
260 | if (!early_pci_allowed()) |
261 | return; | |
262 | ||
fa5b8a30 | 263 | /* This is mostly duplicate of iommu_hole_init */ |
fa10ba64 | 264 | search_agp_bridge(&agp_aper_order, &valid_agp); |
f3eee542 | 265 | |
aaf23042 | 266 | fix = 0; |
24d9b70b | 267 | for (i = 0; amd_nb_bus_dev_ranges[i].dev_limit; i++) { |
55c0d721 YL |
268 | int bus; |
269 | int dev_base, dev_limit; | |
270 | ||
24d9b70b JB |
271 | bus = amd_nb_bus_dev_ranges[i].bus; |
272 | dev_base = amd_nb_bus_dev_ranges[i].dev_base; | |
273 | dev_limit = amd_nb_bus_dev_ranges[i].dev_limit; | |
55c0d721 YL |
274 | |
275 | for (slot = dev_base; slot < dev_limit; slot++) { | |
eec1d4fa | 276 | if (!early_is_amd_nb(read_pci_config(bus, slot, 3, 0x00))) |
55c0d721 YL |
277 | continue; |
278 | ||
279 | ctl = read_pci_config(bus, slot, 3, AMD64_GARTAPERTURECTL); | |
57ab43e3 | 280 | aper_enabled = ctl & GARTEN; |
55c0d721 YL |
281 | aper_order = (ctl >> 1) & 7; |
282 | aper_size = (32 * 1024 * 1024) << aper_order; | |
283 | aper_base = read_pci_config(bus, slot, 3, AMD64_GARTAPERTUREBASE) & 0x7fff; | |
284 | aper_base <<= 25; | |
285 | ||
fa5b8a30 PM |
286 | if (last_valid) { |
287 | if ((aper_order != last_aper_order) || | |
288 | (aper_base != last_aper_base) || | |
289 | (aper_enabled != last_aper_enabled)) { | |
290 | fix = 1; | |
291 | break; | |
292 | } | |
55c0d721 | 293 | } |
fa5b8a30 | 294 | |
55c0d721 YL |
295 | last_aper_order = aper_order; |
296 | last_aper_base = aper_base; | |
297 | last_aper_enabled = aper_enabled; | |
fa5b8a30 | 298 | last_valid = 1; |
aaf23042 | 299 | } |
aaf23042 YL |
300 | } |
301 | ||
302 | if (!fix && !aper_enabled) | |
303 | return; | |
304 | ||
305 | if (!aper_base || !aper_size || aper_base + aper_size > 0x100000000UL) | |
306 | fix = 1; | |
307 | ||
308 | if (gart_fix_e820 && !fix && aper_enabled) { | |
0754557d YL |
309 | if (e820_any_mapped(aper_base, aper_base + aper_size, |
310 | E820_RAM)) { | |
0abbc78a | 311 | /* reserve it, so we can reuse it in second kernel */ |
c96ec953 BH |
312 | pr_info("e820: reserve [mem %#010Lx-%#010Lx] for GART\n", |
313 | aper_base, aper_base + aper_size - 1); | |
d0be6bde | 314 | e820_add_region(aper_base, aper_size, E820_RESERVED); |
aaf23042 YL |
315 | update_e820(); |
316 | } | |
aaf23042 YL |
317 | } |
318 | ||
f3eee542 | 319 | if (valid_agp) |
4f384f8b PM |
320 | return; |
321 | ||
f3eee542 | 322 | /* disable them all at first */ |
24d9b70b | 323 | for (i = 0; i < amd_nb_bus_dev_ranges[i].dev_limit; i++) { |
55c0d721 YL |
324 | int bus; |
325 | int dev_base, dev_limit; | |
326 | ||
24d9b70b JB |
327 | bus = amd_nb_bus_dev_ranges[i].bus; |
328 | dev_base = amd_nb_bus_dev_ranges[i].dev_base; | |
329 | dev_limit = amd_nb_bus_dev_ranges[i].dev_limit; | |
aaf23042 | 330 | |
55c0d721 | 331 | for (slot = dev_base; slot < dev_limit; slot++) { |
eec1d4fa | 332 | if (!early_is_amd_nb(read_pci_config(bus, slot, 3, 0x00))) |
55c0d721 YL |
333 | continue; |
334 | ||
335 | ctl = read_pci_config(bus, slot, 3, AMD64_GARTAPERTURECTL); | |
57ab43e3 | 336 | ctl &= ~GARTEN; |
55c0d721 YL |
337 | write_pci_config(bus, slot, 3, AMD64_GARTAPERTURECTL, ctl); |
338 | } | |
aaf23042 YL |
339 | } |
340 | ||
341 | } | |
342 | ||
8c9fd91a YL |
343 | static int __initdata printed_gart_size_msg; |
344 | ||
480125ba | 345 | int __init gart_iommu_hole_init(void) |
c140df97 | 346 | { |
8c9fd91a | 347 | u32 agp_aper_base = 0, agp_aper_order = 0; |
50895c5d | 348 | u32 aper_size, aper_alloc = 0, aper_order = 0, last_aper_order = 0; |
1da177e4 | 349 | u64 aper_base, last_aper_base = 0; |
55c0d721 YL |
350 | int fix, slot, valid_agp = 0; |
351 | int i, node; | |
1da177e4 | 352 | |
1b457429 AG |
353 | if (!amd_gart_present()) |
354 | return -ENODEV; | |
355 | ||
0440d4c0 JR |
356 | if (gart_iommu_aperture_disabled || !fix_aperture || |
357 | !early_pci_allowed()) | |
480125ba | 358 | return -ENODEV; |
1da177e4 | 359 | |
a5d3244a | 360 | pr_info("Checking aperture...\n"); |
1da177e4 | 361 | |
8c9fd91a YL |
362 | if (!fallback_aper_force) |
363 | agp_aper_base = search_agp_bridge(&agp_aper_order, &valid_agp); | |
364 | ||
1da177e4 | 365 | fix = 0; |
47db4c3e | 366 | node = 0; |
24d9b70b | 367 | for (i = 0; i < amd_nb_bus_dev_ranges[i].dev_limit; i++) { |
55c0d721 YL |
368 | int bus; |
369 | int dev_base, dev_limit; | |
4b83873d | 370 | u32 ctl; |
55c0d721 | 371 | |
24d9b70b JB |
372 | bus = amd_nb_bus_dev_ranges[i].bus; |
373 | dev_base = amd_nb_bus_dev_ranges[i].dev_base; | |
374 | dev_limit = amd_nb_bus_dev_ranges[i].dev_limit; | |
55c0d721 YL |
375 | |
376 | for (slot = dev_base; slot < dev_limit; slot++) { | |
eec1d4fa | 377 | if (!early_is_amd_nb(read_pci_config(bus, slot, 3, 0x00))) |
55c0d721 YL |
378 | continue; |
379 | ||
380 | iommu_detected = 1; | |
381 | gart_iommu_aperture = 1; | |
de957628 | 382 | x86_init.iommu.iommu_init = gart_iommu_init; |
55c0d721 | 383 | |
4b83873d JR |
384 | ctl = read_pci_config(bus, slot, 3, |
385 | AMD64_GARTAPERTURECTL); | |
386 | ||
387 | /* | |
388 | * Before we do anything else disable the GART. It may | |
389 | * still be enabled if we boot into a crash-kernel here. | |
390 | * Reconfiguring the GART while it is enabled could have | |
391 | * unknown side-effects. | |
392 | */ | |
393 | ctl &= ~GARTEN; | |
394 | write_pci_config(bus, slot, 3, AMD64_GARTAPERTURECTL, ctl); | |
395 | ||
396 | aper_order = (ctl >> 1) & 7; | |
55c0d721 YL |
397 | aper_size = (32 * 1024 * 1024) << aper_order; |
398 | aper_base = read_pci_config(bus, slot, 3, AMD64_GARTAPERTUREBASE) & 0x7fff; | |
399 | aper_base <<= 25; | |
400 | ||
c96ec953 BH |
401 | pr_info("Node %d: aperture [bus addr %#010Lx-%#010Lx] (%uMB)\n", |
402 | node, aper_base, aper_base + aper_size - 1, | |
403 | aper_size >> 20); | |
55c0d721 YL |
404 | node++; |
405 | ||
406 | if (!aperture_valid(aper_base, aper_size, 64<<20)) { | |
407 | if (valid_agp && agp_aper_base && | |
408 | agp_aper_base == aper_base && | |
409 | agp_aper_order == aper_order) { | |
410 | /* the same between two setting from NB and agp */ | |
c987d12f YL |
411 | if (!no_iommu && |
412 | max_pfn > MAX_DMA32_PFN && | |
413 | !printed_gart_size_msg) { | |
c96ec953 | 414 | pr_err("you are using iommu with agp, but GART size is less than 64MB\n"); |
a5d3244a BH |
415 | pr_err("please increase GART size in your BIOS setup\n"); |
416 | pr_err("if BIOS doesn't have that option, contact your HW vendor!\n"); | |
55c0d721 YL |
417 | printed_gart_size_msg = 1; |
418 | } | |
419 | } else { | |
420 | fix = 1; | |
421 | goto out; | |
8c9fd91a | 422 | } |
8c9fd91a | 423 | } |
1da177e4 | 424 | |
55c0d721 YL |
425 | if ((last_aper_order && aper_order != last_aper_order) || |
426 | (last_aper_base && aper_base != last_aper_base)) { | |
427 | fix = 1; | |
428 | goto out; | |
429 | } | |
430 | last_aper_order = aper_order; | |
431 | last_aper_base = aper_base; | |
1da177e4 | 432 | } |
c140df97 | 433 | } |
1da177e4 | 434 | |
55c0d721 | 435 | out: |
56dd669a | 436 | if (!fix && !fallback_aper_force) { |
707d4eef | 437 | if (last_aper_base) |
480125ba | 438 | return 1; |
480125ba | 439 | return 0; |
56dd669a | 440 | } |
1da177e4 | 441 | |
8c9fd91a YL |
442 | if (!fallback_aper_force) { |
443 | aper_alloc = agp_aper_base; | |
444 | aper_order = agp_aper_order; | |
445 | } | |
c140df97 IM |
446 | |
447 | if (aper_alloc) { | |
1da177e4 | 448 | /* Got the aperture from the AGP bridge */ |
c987d12f | 449 | } else if ((!no_iommu && max_pfn > MAX_DMA32_PFN) || |
1da177e4 LT |
450 | force_iommu || |
451 | valid_agp || | |
c140df97 | 452 | fallback_aper_force) { |
1b457429 | 453 | pr_info("Your BIOS doesn't leave an aperture memory hole\n"); |
a5d3244a | 454 | pr_info("Please enable the IOMMU option in the BIOS setup\n"); |
c96ec953 | 455 | pr_info("This costs you %dMB of RAM\n", |
a5d3244a | 456 | 32 << fallback_aper_order); |
1da177e4 LT |
457 | |
458 | aper_order = fallback_aper_order; | |
459 | aper_alloc = allocate_aperture(); | |
c140df97 IM |
460 | if (!aper_alloc) { |
461 | /* | |
462 | * Could disable AGP and IOMMU here, but it's | |
463 | * probably not worth it. But the later users | |
464 | * cannot deal with bad apertures and turning | |
465 | * on the aperture over memory causes very | |
466 | * strange problems, so it's better to panic | |
467 | * early. | |
468 | */ | |
1da177e4 LT |
469 | panic("Not enough memory for aperture"); |
470 | } | |
c140df97 | 471 | } else { |
480125ba | 472 | return 0; |
c140df97 | 473 | } |
1da177e4 LT |
474 | |
475 | /* Fix up the north bridges */ | |
24d9b70b | 476 | for (i = 0; i < amd_nb_bus_dev_ranges[i].dev_limit; i++) { |
260133ab BP |
477 | int bus, dev_base, dev_limit; |
478 | ||
479 | /* | |
480 | * Don't enable translation yet but enable GART IO and CPU | |
481 | * accesses and set DISTLBWALKPRB since GART table memory is UC. | |
482 | */ | |
c34151a7 | 483 | u32 ctl = aper_order << 1; |
55c0d721 | 484 | |
24d9b70b JB |
485 | bus = amd_nb_bus_dev_ranges[i].bus; |
486 | dev_base = amd_nb_bus_dev_ranges[i].dev_base; | |
487 | dev_limit = amd_nb_bus_dev_ranges[i].dev_limit; | |
55c0d721 | 488 | for (slot = dev_base; slot < dev_limit; slot++) { |
eec1d4fa | 489 | if (!early_is_amd_nb(read_pci_config(bus, slot, 3, 0x00))) |
55c0d721 YL |
490 | continue; |
491 | ||
260133ab | 492 | write_pci_config(bus, slot, 3, AMD64_GARTAPERTURECTL, ctl); |
55c0d721 YL |
493 | write_pci_config(bus, slot, 3, AMD64_GARTAPERTUREBASE, aper_alloc >> 25); |
494 | } | |
c140df97 | 495 | } |
6703f6d1 RW |
496 | |
497 | set_up_gart_resume(aper_order, aper_alloc); | |
480125ba KRW |
498 | |
499 | return 1; | |
c140df97 | 500 | } |