Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * probe.c - PCI detection and setup code |
| 3 | */ |
| 4 | |
| 5 | #include <linux/kernel.h> |
| 6 | #include <linux/delay.h> |
| 7 | #include <linux/init.h> |
| 8 | #include <linux/pci.h> |
| 9 | #include <linux/slab.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/cpumask.h> |
Shaohua Li | 7d715a6 | 2008-02-25 09:46:41 +0800 | [diff] [blame] | 12 | #include <linux/pci-aspm.h> |
Bjorn Helgaas | 284f5f9 | 2012-04-30 15:21:02 -0600 | [diff] [blame] | 13 | #include <asm-generic/pci-bridge.h> |
Greg KH | bc56b9e | 2005-04-08 14:53:31 +0900 | [diff] [blame] | 14 | #include "pci.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | |
| 16 | #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ |
| 17 | #define CARDBUS_RESERVE_BUSNR 3 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
Yinghai Lu | 67cdc82 | 2012-05-17 18:51:12 -0700 | [diff] [blame] | 19 | struct resource busn_resource = { |
| 20 | .name = "PCI busn", |
| 21 | .start = 0, |
| 22 | .end = 255, |
| 23 | .flags = IORESOURCE_BUS, |
| 24 | }; |
| 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | /* Ugh. Need to stop exporting this to modules. */ |
| 27 | LIST_HEAD(pci_root_buses); |
| 28 | EXPORT_SYMBOL(pci_root_buses); |
| 29 | |
Yinghai Lu | 5cc62c2 | 2012-05-17 18:51:11 -0700 | [diff] [blame] | 30 | static LIST_HEAD(pci_domain_busn_res_list); |
| 31 | |
| 32 | struct pci_domain_busn_res { |
| 33 | struct list_head list; |
| 34 | struct resource res; |
| 35 | int domain_nr; |
| 36 | }; |
| 37 | |
| 38 | static struct resource *get_pci_domain_busn_res(int domain_nr) |
| 39 | { |
| 40 | struct pci_domain_busn_res *r; |
| 41 | |
| 42 | list_for_each_entry(r, &pci_domain_busn_res_list, list) |
| 43 | if (r->domain_nr == domain_nr) |
| 44 | return &r->res; |
| 45 | |
| 46 | r = kzalloc(sizeof(*r), GFP_KERNEL); |
| 47 | if (!r) |
| 48 | return NULL; |
| 49 | |
| 50 | r->domain_nr = domain_nr; |
| 51 | r->res.start = 0; |
| 52 | r->res.end = 0xff; |
| 53 | r->res.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED; |
| 54 | |
| 55 | list_add_tail(&r->list, &pci_domain_busn_res_list); |
| 56 | |
| 57 | return &r->res; |
| 58 | } |
| 59 | |
Greg Kroah-Hartman | 7030892 | 2008-02-13 22:30:39 -0800 | [diff] [blame] | 60 | static int find_anything(struct device *dev, void *data) |
| 61 | { |
| 62 | return 1; |
| 63 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Zhang, Yanmin | ed4aaad | 2007-07-15 23:39:39 -0700 | [diff] [blame] | 65 | /* |
| 66 | * Some device drivers need know if pci is initiated. |
| 67 | * Basically, we think pci is not initiated when there |
Greg Kroah-Hartman | 7030892 | 2008-02-13 22:30:39 -0800 | [diff] [blame] | 68 | * is no device to be found on the pci_bus_type. |
Zhang, Yanmin | ed4aaad | 2007-07-15 23:39:39 -0700 | [diff] [blame] | 69 | */ |
| 70 | int no_pci_devices(void) |
| 71 | { |
Greg Kroah-Hartman | 7030892 | 2008-02-13 22:30:39 -0800 | [diff] [blame] | 72 | struct device *dev; |
| 73 | int no_devices; |
Zhang, Yanmin | ed4aaad | 2007-07-15 23:39:39 -0700 | [diff] [blame] | 74 | |
Greg Kroah-Hartman | 7030892 | 2008-02-13 22:30:39 -0800 | [diff] [blame] | 75 | dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything); |
| 76 | no_devices = (dev == NULL); |
| 77 | put_device(dev); |
| 78 | return no_devices; |
| 79 | } |
Zhang, Yanmin | ed4aaad | 2007-07-15 23:39:39 -0700 | [diff] [blame] | 80 | EXPORT_SYMBOL(no_pci_devices); |
| 81 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | * PCI Bus Class |
| 84 | */ |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 85 | static void release_pcibus_dev(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | { |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 87 | struct pci_bus *pci_bus = to_pci_bus(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
| 89 | if (pci_bus->bridge) |
| 90 | put_device(pci_bus->bridge); |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 91 | pci_bus_remove_resources(pci_bus); |
Benjamin Herrenschmidt | 98d9f30c8 | 2011-04-11 11:37:07 +1000 | [diff] [blame] | 92 | pci_release_bus_of_node(pci_bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | kfree(pci_bus); |
| 94 | } |
| 95 | |
| 96 | static struct class pcibus_class = { |
| 97 | .name = "pci_bus", |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 98 | .dev_release = &release_pcibus_dev, |
Greg Kroah-Hartman | 56039e6 | 2013-07-24 15:05:17 -0700 | [diff] [blame] | 99 | .dev_groups = pcibus_groups, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | }; |
| 101 | |
| 102 | static int __init pcibus_class_init(void) |
| 103 | { |
| 104 | return class_register(&pcibus_class); |
| 105 | } |
| 106 | postcore_initcall(pcibus_class_init); |
| 107 | |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 108 | static u64 pci_size(u64 base, u64 maxbase, u64 mask) |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 109 | { |
| 110 | u64 size = mask & maxbase; /* Find the significant bits */ |
| 111 | if (!size) |
| 112 | return 0; |
| 113 | |
| 114 | /* Get the lowest of them to find the decode size, and |
| 115 | from that the extent. */ |
| 116 | size = (size & ~(size-1)) - 1; |
| 117 | |
| 118 | /* base == maxbase can be valid only if the BAR has |
| 119 | already been programmed with all 1s. */ |
| 120 | if (base == maxbase && ((base | size) & mask) != mask) |
| 121 | return 0; |
| 122 | |
| 123 | return size; |
| 124 | } |
| 125 | |
Bjorn Helgaas | 28c6821 | 2011-06-14 13:04:35 -0600 | [diff] [blame] | 126 | static inline unsigned long decode_bar(struct pci_dev *dev, u32 bar) |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 127 | { |
Bjorn Helgaas | 8d6a6a4 | 2011-06-14 13:04:29 -0600 | [diff] [blame] | 128 | u32 mem_type; |
Bjorn Helgaas | 28c6821 | 2011-06-14 13:04:35 -0600 | [diff] [blame] | 129 | unsigned long flags; |
Bjorn Helgaas | 8d6a6a4 | 2011-06-14 13:04:29 -0600 | [diff] [blame] | 130 | |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 131 | if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) { |
Bjorn Helgaas | 28c6821 | 2011-06-14 13:04:35 -0600 | [diff] [blame] | 132 | flags = bar & ~PCI_BASE_ADDRESS_IO_MASK; |
| 133 | flags |= IORESOURCE_IO; |
| 134 | return flags; |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 135 | } |
| 136 | |
Bjorn Helgaas | 28c6821 | 2011-06-14 13:04:35 -0600 | [diff] [blame] | 137 | flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK; |
| 138 | flags |= IORESOURCE_MEM; |
| 139 | if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH) |
| 140 | flags |= IORESOURCE_PREFETCH; |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 141 | |
Bjorn Helgaas | 8d6a6a4 | 2011-06-14 13:04:29 -0600 | [diff] [blame] | 142 | mem_type = bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK; |
| 143 | switch (mem_type) { |
| 144 | case PCI_BASE_ADDRESS_MEM_TYPE_32: |
| 145 | break; |
| 146 | case PCI_BASE_ADDRESS_MEM_TYPE_1M: |
Bjorn Helgaas | 0ff9514 | 2012-08-23 10:53:08 -0600 | [diff] [blame] | 147 | /* 1M mem BAR treated as 32-bit BAR */ |
Bjorn Helgaas | 8d6a6a4 | 2011-06-14 13:04:29 -0600 | [diff] [blame] | 148 | break; |
| 149 | case PCI_BASE_ADDRESS_MEM_TYPE_64: |
Bjorn Helgaas | 28c6821 | 2011-06-14 13:04:35 -0600 | [diff] [blame] | 150 | flags |= IORESOURCE_MEM_64; |
| 151 | break; |
Bjorn Helgaas | 8d6a6a4 | 2011-06-14 13:04:29 -0600 | [diff] [blame] | 152 | default: |
Bjorn Helgaas | 0ff9514 | 2012-08-23 10:53:08 -0600 | [diff] [blame] | 153 | /* mem unknown type treated as 32-bit BAR */ |
Bjorn Helgaas | 8d6a6a4 | 2011-06-14 13:04:29 -0600 | [diff] [blame] | 154 | break; |
| 155 | } |
Bjorn Helgaas | 28c6821 | 2011-06-14 13:04:35 -0600 | [diff] [blame] | 156 | return flags; |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 157 | } |
| 158 | |
Zoltan Kiss | 808e34e | 2013-08-22 23:19:18 +0100 | [diff] [blame] | 159 | #define PCI_COMMAND_DECODE_ENABLE (PCI_COMMAND_MEMORY | PCI_COMMAND_IO) |
| 160 | |
Yu Zhao | 0b400c7 | 2008-11-22 02:40:40 +0800 | [diff] [blame] | 161 | /** |
| 162 | * pci_read_base - read a PCI BAR |
| 163 | * @dev: the PCI device |
| 164 | * @type: type of the BAR |
| 165 | * @res: resource buffer to be filled in |
| 166 | * @pos: BAR position in the config space |
| 167 | * |
| 168 | * Returns 1 if the BAR is 64-bit, or 0 if 32-bit. |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 169 | */ |
Yu Zhao | 0b400c7 | 2008-11-22 02:40:40 +0800 | [diff] [blame] | 170 | int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type, |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 171 | struct resource *res, unsigned int pos) |
| 172 | { |
| 173 | u32 l, sz, mask; |
Jacob Pan | 253d2e5 | 2010-07-16 10:19:22 -0700 | [diff] [blame] | 174 | u16 orig_cmd; |
Kevin Hao | cf4d1cf | 2013-05-25 19:36:27 +0800 | [diff] [blame] | 175 | struct pci_bus_region region, inverted_region; |
Bjorn Helgaas | 0ff9514 | 2012-08-23 10:53:08 -0600 | [diff] [blame] | 176 | bool bar_too_big = false, bar_disabled = false; |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 177 | |
Michael S. Tsirkin | 1ed6743 | 2009-10-29 17:24:59 +0200 | [diff] [blame] | 178 | mask = type ? PCI_ROM_ADDRESS_MASK : ~0; |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 179 | |
Bjorn Helgaas | 0ff9514 | 2012-08-23 10:53:08 -0600 | [diff] [blame] | 180 | /* No printks while decoding is disabled! */ |
Jacob Pan | 253d2e5 | 2010-07-16 10:19:22 -0700 | [diff] [blame] | 181 | if (!dev->mmio_always_on) { |
| 182 | pci_read_config_word(dev, PCI_COMMAND, &orig_cmd); |
Zoltan Kiss | 808e34e | 2013-08-22 23:19:18 +0100 | [diff] [blame] | 183 | if (orig_cmd & PCI_COMMAND_DECODE_ENABLE) { |
| 184 | pci_write_config_word(dev, PCI_COMMAND, |
| 185 | orig_cmd & ~PCI_COMMAND_DECODE_ENABLE); |
| 186 | } |
Jacob Pan | 253d2e5 | 2010-07-16 10:19:22 -0700 | [diff] [blame] | 187 | } |
| 188 | |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 189 | res->name = pci_name(dev); |
| 190 | |
| 191 | pci_read_config_dword(dev, pos, &l); |
Michael S. Tsirkin | 1ed6743 | 2009-10-29 17:24:59 +0200 | [diff] [blame] | 192 | pci_write_config_dword(dev, pos, l | mask); |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 193 | pci_read_config_dword(dev, pos, &sz); |
| 194 | pci_write_config_dword(dev, pos, l); |
| 195 | |
| 196 | /* |
| 197 | * All bits set in sz means the device isn't working properly. |
Bjorn Helgaas | 45aa23b | 2010-04-22 09:02:43 -0600 | [diff] [blame] | 198 | * If the BAR isn't implemented, all bits must be 0. If it's a |
| 199 | * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit |
| 200 | * 1 must be clear. |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 201 | */ |
Bjorn Helgaas | 45aa23b | 2010-04-22 09:02:43 -0600 | [diff] [blame] | 202 | if (!sz || sz == 0xffffffff) |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 203 | goto fail; |
| 204 | |
| 205 | /* |
| 206 | * I don't know how l can have all bits set. Copied from old code. |
| 207 | * Maybe it fixes a bug on some ancient platform. |
| 208 | */ |
| 209 | if (l == 0xffffffff) |
| 210 | l = 0; |
| 211 | |
| 212 | if (type == pci_bar_unknown) { |
Bjorn Helgaas | 28c6821 | 2011-06-14 13:04:35 -0600 | [diff] [blame] | 213 | res->flags = decode_bar(dev, l); |
| 214 | res->flags |= IORESOURCE_SIZEALIGN; |
| 215 | if (res->flags & IORESOURCE_IO) { |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 216 | l &= PCI_BASE_ADDRESS_IO_MASK; |
David S. Miller | 5aceca9 | 2011-05-23 17:12:22 -0700 | [diff] [blame] | 217 | mask = PCI_BASE_ADDRESS_IO_MASK & (u32) IO_SPACE_LIMIT; |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 218 | } else { |
| 219 | l &= PCI_BASE_ADDRESS_MEM_MASK; |
| 220 | mask = (u32)PCI_BASE_ADDRESS_MEM_MASK; |
| 221 | } |
| 222 | } else { |
| 223 | res->flags |= (l & IORESOURCE_ROM_ENABLE); |
| 224 | l &= PCI_ROM_ADDRESS_MASK; |
| 225 | mask = (u32)PCI_ROM_ADDRESS_MASK; |
| 226 | } |
| 227 | |
Bjorn Helgaas | 28c6821 | 2011-06-14 13:04:35 -0600 | [diff] [blame] | 228 | if (res->flags & IORESOURCE_MEM_64) { |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 229 | u64 l64 = l; |
| 230 | u64 sz64 = sz; |
| 231 | u64 mask64 = mask | (u64)~0 << 32; |
| 232 | |
| 233 | pci_read_config_dword(dev, pos + 4, &l); |
| 234 | pci_write_config_dword(dev, pos + 4, ~0); |
| 235 | pci_read_config_dword(dev, pos + 4, &sz); |
| 236 | pci_write_config_dword(dev, pos + 4, l); |
| 237 | |
| 238 | l64 |= ((u64)l << 32); |
| 239 | sz64 |= ((u64)sz << 32); |
| 240 | |
| 241 | sz64 = pci_size(l64, sz64, mask64); |
| 242 | |
| 243 | if (!sz64) |
| 244 | goto fail; |
| 245 | |
Matthew Wilcox | cc5499c | 2008-07-28 13:39:00 -0400 | [diff] [blame] | 246 | if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) { |
Bjorn Helgaas | 0ff9514 | 2012-08-23 10:53:08 -0600 | [diff] [blame] | 247 | bar_too_big = true; |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 248 | goto fail; |
Bjorn Helgaas | c7dabef | 2009-10-27 13:26:47 -0600 | [diff] [blame] | 249 | } |
| 250 | |
Bjorn Helgaas | c7dabef | 2009-10-27 13:26:47 -0600 | [diff] [blame] | 251 | if ((sizeof(resource_size_t) < 8) && l) { |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 252 | /* Address above 32-bit boundary; disable the BAR */ |
| 253 | pci_write_config_dword(dev, pos, 0); |
| 254 | pci_write_config_dword(dev, pos + 4, 0); |
Bjorn Helgaas | 5bfa14e | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 255 | region.start = 0; |
| 256 | region.end = sz64; |
Bjorn Helgaas | 0ff9514 | 2012-08-23 10:53:08 -0600 | [diff] [blame] | 257 | bar_disabled = true; |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 258 | } else { |
Bjorn Helgaas | 5bfa14e | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 259 | region.start = l64; |
| 260 | region.end = l64 + sz64; |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 261 | } |
| 262 | } else { |
Bjorn Helgaas | 45aa23b | 2010-04-22 09:02:43 -0600 | [diff] [blame] | 263 | sz = pci_size(l, sz, mask); |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 264 | |
Bjorn Helgaas | 45aa23b | 2010-04-22 09:02:43 -0600 | [diff] [blame] | 265 | if (!sz) |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 266 | goto fail; |
| 267 | |
Bjorn Helgaas | 5bfa14e | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 268 | region.start = l; |
| 269 | region.end = l + sz; |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 270 | } |
| 271 | |
Kevin Hao | 96ddef2 | 2013-05-25 19:36:26 +0800 | [diff] [blame] | 272 | pcibios_bus_to_resource(dev, res, ®ion); |
Kevin Hao | cf4d1cf | 2013-05-25 19:36:27 +0800 | [diff] [blame] | 273 | pcibios_resource_to_bus(dev, &inverted_region, res); |
| 274 | |
| 275 | /* |
| 276 | * If "A" is a BAR value (a bus address), "bus_to_resource(A)" is |
| 277 | * the corresponding resource address (the physical address used by |
| 278 | * the CPU. Converting that resource address back to a bus address |
| 279 | * should yield the original BAR value: |
| 280 | * |
| 281 | * resource_to_bus(bus_to_resource(A)) == A |
| 282 | * |
| 283 | * If it doesn't, CPU accesses to "bus_to_resource(A)" will not |
| 284 | * be claimed by the device. |
| 285 | */ |
| 286 | if (inverted_region.start != region.start) { |
| 287 | dev_info(&dev->dev, "reg 0x%x: initial BAR value %pa invalid; forcing reassignment\n", |
| 288 | pos, ®ion.start); |
| 289 | res->flags |= IORESOURCE_UNSET; |
| 290 | res->end -= res->start; |
| 291 | res->start = 0; |
| 292 | } |
Kevin Hao | 96ddef2 | 2013-05-25 19:36:26 +0800 | [diff] [blame] | 293 | |
Bjorn Helgaas | 0ff9514 | 2012-08-23 10:53:08 -0600 | [diff] [blame] | 294 | goto out; |
| 295 | |
| 296 | |
| 297 | fail: |
| 298 | res->flags = 0; |
| 299 | out: |
Zoltan Kiss | 808e34e | 2013-08-22 23:19:18 +0100 | [diff] [blame] | 300 | if (!dev->mmio_always_on && |
| 301 | (orig_cmd & PCI_COMMAND_DECODE_ENABLE)) |
Bjorn Helgaas | bbffe43 | 2012-07-06 12:08:18 -0600 | [diff] [blame] | 302 | pci_write_config_word(dev, PCI_COMMAND, orig_cmd); |
| 303 | |
Bjorn Helgaas | 0ff9514 | 2012-08-23 10:53:08 -0600 | [diff] [blame] | 304 | if (bar_too_big) |
Kevin Hao | 33963e30 | 2013-05-25 19:36:25 +0800 | [diff] [blame] | 305 | dev_err(&dev->dev, "reg 0x%x: can't handle 64-bit BAR\n", pos); |
Bjorn Helgaas | 0ff9514 | 2012-08-23 10:53:08 -0600 | [diff] [blame] | 306 | if (res->flags && !bar_disabled) |
Kevin Hao | 33963e30 | 2013-05-25 19:36:25 +0800 | [diff] [blame] | 307 | dev_printk(KERN_DEBUG, &dev->dev, "reg 0x%x: %pR\n", pos, res); |
Bjorn Helgaas | 0ff9514 | 2012-08-23 10:53:08 -0600 | [diff] [blame] | 308 | |
Bjorn Helgaas | 28c6821 | 2011-06-14 13:04:35 -0600 | [diff] [blame] | 309 | return (res->flags & IORESOURCE_MEM_64) ? 1 : 0; |
Yinghai Lu | 07eddf3 | 2006-11-29 13:53:10 -0800 | [diff] [blame] | 310 | } |
| 311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom) |
| 313 | { |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 314 | unsigned int pos, reg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 316 | for (pos = 0; pos < howmany; pos++) { |
| 317 | struct resource *res = &dev->resource[pos]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | reg = PCI_BASE_ADDRESS_0 + (pos << 2); |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 319 | pos += __pci_read_base(dev, pci_bar_unknown, res, reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | } |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 321 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | if (rom) { |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 323 | struct resource *res = &dev->resource[PCI_ROM_RESOURCE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | dev->rom_base_reg = rom; |
Matthew Wilcox | 6ac665c | 2008-07-28 13:38:59 -0400 | [diff] [blame] | 325 | res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH | |
| 326 | IORESOURCE_READONLY | IORESOURCE_CACHEABLE | |
| 327 | IORESOURCE_SIZEALIGN; |
| 328 | __pci_read_base(dev, pci_bar_mem32, res, rom); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | } |
| 330 | } |
| 331 | |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 332 | static void pci_read_bridge_io(struct pci_bus *child) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | { |
| 334 | struct pci_dev *dev = child->self; |
| 335 | u8 io_base_lo, io_limit_lo; |
Bjorn Helgaas | 2b28ae1 | 2012-07-09 13:38:57 -0600 | [diff] [blame] | 336 | unsigned long io_mask, io_granularity, base, limit; |
Bjorn Helgaas | 5bfa14e | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 337 | struct pci_bus_region region; |
Bjorn Helgaas | 2b28ae1 | 2012-07-09 13:38:57 -0600 | [diff] [blame] | 338 | struct resource *res; |
| 339 | |
| 340 | io_mask = PCI_IO_RANGE_MASK; |
| 341 | io_granularity = 0x1000; |
| 342 | if (dev->io_window_1k) { |
| 343 | /* Support 1K I/O space granularity */ |
| 344 | io_mask = PCI_IO_1K_RANGE_MASK; |
| 345 | io_granularity = 0x400; |
| 346 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | res = child->resource[0]; |
| 349 | pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo); |
| 350 | pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo); |
Bjorn Helgaas | 2b28ae1 | 2012-07-09 13:38:57 -0600 | [diff] [blame] | 351 | base = (io_base_lo & io_mask) << 8; |
| 352 | limit = (io_limit_lo & io_mask) << 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
| 354 | if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) { |
| 355 | u16 io_base_hi, io_limit_hi; |
Bjorn Helgaas | 8f38eac | 2012-06-19 07:45:44 -0600 | [diff] [blame] | 356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi); |
| 358 | pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi); |
Bjorn Helgaas | 8f38eac | 2012-06-19 07:45:44 -0600 | [diff] [blame] | 359 | base |= ((unsigned long) io_base_hi << 16); |
| 360 | limit |= ((unsigned long) io_limit_hi << 16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | } |
| 362 | |
Bjorn Helgaas | 5dde383 | 2012-07-09 13:38:41 -0600 | [diff] [blame] | 363 | if (base <= limit) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO; |
Bjorn Helgaas | 5bfa14e | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 365 | region.start = base; |
Bjorn Helgaas | 2b28ae1 | 2012-07-09 13:38:57 -0600 | [diff] [blame] | 366 | region.end = limit + io_granularity - 1; |
| 367 | pcibios_bus_to_resource(dev, res, ®ion); |
Bjorn Helgaas | c7dabef | 2009-10-27 13:26:47 -0600 | [diff] [blame] | 368 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | } |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 370 | } |
| 371 | |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 372 | static void pci_read_bridge_mmio(struct pci_bus *child) |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 373 | { |
| 374 | struct pci_dev *dev = child->self; |
| 375 | u16 mem_base_lo, mem_limit_lo; |
| 376 | unsigned long base, limit; |
Bjorn Helgaas | 5bfa14e | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 377 | struct pci_bus_region region; |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 378 | struct resource *res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
| 380 | res = child->resource[1]; |
| 381 | pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo); |
| 382 | pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo); |
Bjorn Helgaas | 8f38eac | 2012-06-19 07:45:44 -0600 | [diff] [blame] | 383 | base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16; |
| 384 | limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16; |
Bjorn Helgaas | 5dde383 | 2012-07-09 13:38:41 -0600 | [diff] [blame] | 385 | if (base <= limit) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM; |
Bjorn Helgaas | 5bfa14e | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 387 | region.start = base; |
| 388 | region.end = limit + 0xfffff; |
Bjorn Helgaas | fb127cb | 2012-02-23 20:19:04 -0700 | [diff] [blame] | 389 | pcibios_bus_to_resource(dev, res, ®ion); |
Bjorn Helgaas | c7dabef | 2009-10-27 13:26:47 -0600 | [diff] [blame] | 390 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | } |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 392 | } |
| 393 | |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 394 | static void pci_read_bridge_mmio_pref(struct pci_bus *child) |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 395 | { |
| 396 | struct pci_dev *dev = child->self; |
| 397 | u16 mem_base_lo, mem_limit_lo; |
| 398 | unsigned long base, limit; |
Bjorn Helgaas | 5bfa14e | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 399 | struct pci_bus_region region; |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 400 | struct resource *res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | |
| 402 | res = child->resource[2]; |
| 403 | pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo); |
| 404 | pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo); |
Bjorn Helgaas | 8f38eac | 2012-06-19 07:45:44 -0600 | [diff] [blame] | 405 | base = ((unsigned long) mem_base_lo & PCI_PREF_RANGE_MASK) << 16; |
| 406 | limit = ((unsigned long) mem_limit_lo & PCI_PREF_RANGE_MASK) << 16; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
| 408 | if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) { |
| 409 | u32 mem_base_hi, mem_limit_hi; |
Bjorn Helgaas | 8f38eac | 2012-06-19 07:45:44 -0600 | [diff] [blame] | 410 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi); |
| 412 | pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi); |
| 413 | |
| 414 | /* |
| 415 | * Some bridges set the base > limit by default, and some |
| 416 | * (broken) BIOSes do not initialize them. If we find |
| 417 | * this, just assume they are not being used. |
| 418 | */ |
| 419 | if (mem_base_hi <= mem_limit_hi) { |
| 420 | #if BITS_PER_LONG == 64 |
Bjorn Helgaas | 8f38eac | 2012-06-19 07:45:44 -0600 | [diff] [blame] | 421 | base |= ((unsigned long) mem_base_hi) << 32; |
| 422 | limit |= ((unsigned long) mem_limit_hi) << 32; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | #else |
| 424 | if (mem_base_hi || mem_limit_hi) { |
Bjorn Helgaas | 80ccba1 | 2008-06-13 10:52:11 -0600 | [diff] [blame] | 425 | dev_err(&dev->dev, "can't handle 64-bit " |
| 426 | "address space for bridge\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | return; |
| 428 | } |
| 429 | #endif |
| 430 | } |
| 431 | } |
Bjorn Helgaas | 5dde383 | 2012-07-09 13:38:41 -0600 | [diff] [blame] | 432 | if (base <= limit) { |
Yinghai Lu | 1f82de1 | 2009-04-23 20:48:32 -0700 | [diff] [blame] | 433 | res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) | |
| 434 | IORESOURCE_MEM | IORESOURCE_PREFETCH; |
| 435 | if (res->flags & PCI_PREF_RANGE_TYPE_64) |
| 436 | res->flags |= IORESOURCE_MEM_64; |
Bjorn Helgaas | 5bfa14e | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 437 | region.start = base; |
| 438 | region.end = limit + 0xfffff; |
Bjorn Helgaas | fb127cb | 2012-02-23 20:19:04 -0700 | [diff] [blame] | 439 | pcibios_bus_to_resource(dev, res, ®ion); |
Bjorn Helgaas | c7dabef | 2009-10-27 13:26:47 -0600 | [diff] [blame] | 440 | dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | } |
| 442 | } |
| 443 | |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 444 | void pci_read_bridge_bases(struct pci_bus *child) |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 445 | { |
| 446 | struct pci_dev *dev = child->self; |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 447 | struct resource *res; |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 448 | int i; |
| 449 | |
| 450 | if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */ |
| 451 | return; |
| 452 | |
Yinghai Lu | b918c62 | 2012-05-17 18:51:11 -0700 | [diff] [blame] | 453 | dev_info(&dev->dev, "PCI bridge to %pR%s\n", |
| 454 | &child->busn_res, |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 455 | dev->transparent ? " (subtractive decode)" : ""); |
| 456 | |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 457 | pci_bus_remove_resources(child); |
| 458 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) |
| 459 | child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i]; |
| 460 | |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 461 | pci_read_bridge_io(child); |
| 462 | pci_read_bridge_mmio(child); |
| 463 | pci_read_bridge_mmio_pref(child); |
Bjorn Helgaas | 2adf751 | 2010-02-23 10:24:26 -0700 | [diff] [blame] | 464 | |
| 465 | if (dev->transparent) { |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 466 | pci_bus_for_each_resource(child->parent, res, i) { |
| 467 | if (res) { |
| 468 | pci_bus_add_resource(child, res, |
| 469 | PCI_SUBTRACTIVE_DECODE); |
Bjorn Helgaas | 2adf751 | 2010-02-23 10:24:26 -0700 | [diff] [blame] | 470 | dev_printk(KERN_DEBUG, &dev->dev, |
| 471 | " bridge window %pR (subtractive decode)\n", |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 472 | res); |
| 473 | } |
Bjorn Helgaas | 2adf751 | 2010-02-23 10:24:26 -0700 | [diff] [blame] | 474 | } |
| 475 | } |
Bjorn Helgaas | fa27b2d | 2010-02-23 10:24:21 -0700 | [diff] [blame] | 476 | } |
| 477 | |
Bjorn Helgaas | 0501348 | 2013-06-05 14:22:11 -0600 | [diff] [blame] | 478 | static struct pci_bus *pci_alloc_bus(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | { |
| 480 | struct pci_bus *b; |
| 481 | |
Eric Sesterhenn | f5afe80 | 2006-02-28 15:34:49 +0100 | [diff] [blame] | 482 | b = kzalloc(sizeof(*b), GFP_KERNEL); |
Bjorn Helgaas | 0501348 | 2013-06-05 14:22:11 -0600 | [diff] [blame] | 483 | if (!b) |
| 484 | return NULL; |
| 485 | |
| 486 | INIT_LIST_HEAD(&b->node); |
| 487 | INIT_LIST_HEAD(&b->children); |
| 488 | INIT_LIST_HEAD(&b->devices); |
| 489 | INIT_LIST_HEAD(&b->slots); |
| 490 | INIT_LIST_HEAD(&b->resources); |
| 491 | b->max_bus_speed = PCI_SPEED_UNKNOWN; |
| 492 | b->cur_bus_speed = PCI_SPEED_UNKNOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | return b; |
| 494 | } |
| 495 | |
Jiang Liu | 70efde2 | 2013-06-07 16:16:51 -0600 | [diff] [blame] | 496 | static void pci_release_host_bridge_dev(struct device *dev) |
| 497 | { |
| 498 | struct pci_host_bridge *bridge = to_pci_host_bridge(dev); |
| 499 | |
| 500 | if (bridge->release_fn) |
| 501 | bridge->release_fn(bridge); |
| 502 | |
| 503 | pci_free_resource_list(&bridge->windows); |
| 504 | |
| 505 | kfree(bridge); |
| 506 | } |
| 507 | |
Yinghai Lu | 7b54366 | 2012-04-02 18:31:53 -0700 | [diff] [blame] | 508 | static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b) |
| 509 | { |
| 510 | struct pci_host_bridge *bridge; |
| 511 | |
| 512 | bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); |
Bjorn Helgaas | 0501348 | 2013-06-05 14:22:11 -0600 | [diff] [blame] | 513 | if (!bridge) |
| 514 | return NULL; |
Yinghai Lu | 7b54366 | 2012-04-02 18:31:53 -0700 | [diff] [blame] | 515 | |
Bjorn Helgaas | 0501348 | 2013-06-05 14:22:11 -0600 | [diff] [blame] | 516 | INIT_LIST_HEAD(&bridge->windows); |
| 517 | bridge->bus = b; |
Yinghai Lu | 7b54366 | 2012-04-02 18:31:53 -0700 | [diff] [blame] | 518 | return bridge; |
| 519 | } |
| 520 | |
Jacob Keller | 343e51a | 2013-07-31 06:53:16 +0000 | [diff] [blame] | 521 | const unsigned char pcix_bus_speed[] = { |
Matthew Wilcox | 9be60ca | 2009-12-13 08:11:33 -0500 | [diff] [blame] | 522 | PCI_SPEED_UNKNOWN, /* 0 */ |
| 523 | PCI_SPEED_66MHz_PCIX, /* 1 */ |
| 524 | PCI_SPEED_100MHz_PCIX, /* 2 */ |
| 525 | PCI_SPEED_133MHz_PCIX, /* 3 */ |
| 526 | PCI_SPEED_UNKNOWN, /* 4 */ |
| 527 | PCI_SPEED_66MHz_PCIX_ECC, /* 5 */ |
| 528 | PCI_SPEED_100MHz_PCIX_ECC, /* 6 */ |
| 529 | PCI_SPEED_133MHz_PCIX_ECC, /* 7 */ |
| 530 | PCI_SPEED_UNKNOWN, /* 8 */ |
| 531 | PCI_SPEED_66MHz_PCIX_266, /* 9 */ |
| 532 | PCI_SPEED_100MHz_PCIX_266, /* A */ |
| 533 | PCI_SPEED_133MHz_PCIX_266, /* B */ |
| 534 | PCI_SPEED_UNKNOWN, /* C */ |
| 535 | PCI_SPEED_66MHz_PCIX_533, /* D */ |
| 536 | PCI_SPEED_100MHz_PCIX_533, /* E */ |
| 537 | PCI_SPEED_133MHz_PCIX_533 /* F */ |
| 538 | }; |
| 539 | |
Jacob Keller | 343e51a | 2013-07-31 06:53:16 +0000 | [diff] [blame] | 540 | const unsigned char pcie_link_speed[] = { |
Matthew Wilcox | 3749c51 | 2009-12-13 08:11:32 -0500 | [diff] [blame] | 541 | PCI_SPEED_UNKNOWN, /* 0 */ |
| 542 | PCIE_SPEED_2_5GT, /* 1 */ |
| 543 | PCIE_SPEED_5_0GT, /* 2 */ |
Matthew Wilcox | 9dfd97f | 2009-12-13 08:11:35 -0500 | [diff] [blame] | 544 | PCIE_SPEED_8_0GT, /* 3 */ |
Matthew Wilcox | 3749c51 | 2009-12-13 08:11:32 -0500 | [diff] [blame] | 545 | PCI_SPEED_UNKNOWN, /* 4 */ |
| 546 | PCI_SPEED_UNKNOWN, /* 5 */ |
| 547 | PCI_SPEED_UNKNOWN, /* 6 */ |
| 548 | PCI_SPEED_UNKNOWN, /* 7 */ |
| 549 | PCI_SPEED_UNKNOWN, /* 8 */ |
| 550 | PCI_SPEED_UNKNOWN, /* 9 */ |
| 551 | PCI_SPEED_UNKNOWN, /* A */ |
| 552 | PCI_SPEED_UNKNOWN, /* B */ |
| 553 | PCI_SPEED_UNKNOWN, /* C */ |
| 554 | PCI_SPEED_UNKNOWN, /* D */ |
| 555 | PCI_SPEED_UNKNOWN, /* E */ |
| 556 | PCI_SPEED_UNKNOWN /* F */ |
| 557 | }; |
| 558 | |
| 559 | void pcie_update_link_speed(struct pci_bus *bus, u16 linksta) |
| 560 | { |
Bjorn Helgaas | 231afea | 2012-12-05 13:51:18 -0700 | [diff] [blame] | 561 | bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS]; |
Matthew Wilcox | 3749c51 | 2009-12-13 08:11:32 -0500 | [diff] [blame] | 562 | } |
| 563 | EXPORT_SYMBOL_GPL(pcie_update_link_speed); |
| 564 | |
Matthew Wilcox | 45b4cdd5 | 2009-12-13 08:11:34 -0500 | [diff] [blame] | 565 | static unsigned char agp_speeds[] = { |
| 566 | AGP_UNKNOWN, |
| 567 | AGP_1X, |
| 568 | AGP_2X, |
| 569 | AGP_4X, |
| 570 | AGP_8X |
| 571 | }; |
| 572 | |
| 573 | static enum pci_bus_speed agp_speed(int agp3, int agpstat) |
| 574 | { |
| 575 | int index = 0; |
| 576 | |
| 577 | if (agpstat & 4) |
| 578 | index = 3; |
| 579 | else if (agpstat & 2) |
| 580 | index = 2; |
| 581 | else if (agpstat & 1) |
| 582 | index = 1; |
| 583 | else |
| 584 | goto out; |
| 585 | |
| 586 | if (agp3) { |
| 587 | index += 2; |
| 588 | if (index == 5) |
| 589 | index = 0; |
| 590 | } |
| 591 | |
| 592 | out: |
| 593 | return agp_speeds[index]; |
| 594 | } |
| 595 | |
| 596 | |
Matthew Wilcox | 9be60ca | 2009-12-13 08:11:33 -0500 | [diff] [blame] | 597 | static void pci_set_bus_speed(struct pci_bus *bus) |
| 598 | { |
| 599 | struct pci_dev *bridge = bus->self; |
| 600 | int pos; |
| 601 | |
Matthew Wilcox | 45b4cdd5 | 2009-12-13 08:11:34 -0500 | [diff] [blame] | 602 | pos = pci_find_capability(bridge, PCI_CAP_ID_AGP); |
| 603 | if (!pos) |
| 604 | pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3); |
| 605 | if (pos) { |
| 606 | u32 agpstat, agpcmd; |
| 607 | |
| 608 | pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat); |
| 609 | bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7); |
| 610 | |
| 611 | pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd); |
| 612 | bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7); |
| 613 | } |
| 614 | |
Matthew Wilcox | 9be60ca | 2009-12-13 08:11:33 -0500 | [diff] [blame] | 615 | pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX); |
| 616 | if (pos) { |
| 617 | u16 status; |
| 618 | enum pci_bus_speed max; |
Matthew Wilcox | 9be60ca | 2009-12-13 08:11:33 -0500 | [diff] [blame] | 619 | |
Bjorn Helgaas | 7793eea | 2012-12-05 13:51:17 -0700 | [diff] [blame] | 620 | pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS, |
| 621 | &status); |
| 622 | |
| 623 | if (status & PCI_X_SSTATUS_533MHZ) { |
Matthew Wilcox | 9be60ca | 2009-12-13 08:11:33 -0500 | [diff] [blame] | 624 | max = PCI_SPEED_133MHz_PCIX_533; |
Bjorn Helgaas | 7793eea | 2012-12-05 13:51:17 -0700 | [diff] [blame] | 625 | } else if (status & PCI_X_SSTATUS_266MHZ) { |
Matthew Wilcox | 9be60ca | 2009-12-13 08:11:33 -0500 | [diff] [blame] | 626 | max = PCI_SPEED_133MHz_PCIX_266; |
Bjorn Helgaas | 7793eea | 2012-12-05 13:51:17 -0700 | [diff] [blame] | 627 | } else if (status & PCI_X_SSTATUS_133MHZ) { |
| 628 | if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2) { |
Matthew Wilcox | 9be60ca | 2009-12-13 08:11:33 -0500 | [diff] [blame] | 629 | max = PCI_SPEED_133MHz_PCIX_ECC; |
| 630 | } else { |
| 631 | max = PCI_SPEED_133MHz_PCIX; |
| 632 | } |
| 633 | } else { |
| 634 | max = PCI_SPEED_66MHz_PCIX; |
| 635 | } |
| 636 | |
| 637 | bus->max_bus_speed = max; |
Bjorn Helgaas | 7793eea | 2012-12-05 13:51:17 -0700 | [diff] [blame] | 638 | bus->cur_bus_speed = pcix_bus_speed[ |
| 639 | (status & PCI_X_SSTATUS_FREQ) >> 6]; |
Matthew Wilcox | 9be60ca | 2009-12-13 08:11:33 -0500 | [diff] [blame] | 640 | |
| 641 | return; |
| 642 | } |
| 643 | |
| 644 | pos = pci_find_capability(bridge, PCI_CAP_ID_EXP); |
| 645 | if (pos) { |
| 646 | u32 linkcap; |
| 647 | u16 linksta; |
| 648 | |
Jiang Liu | 59875ae | 2012-07-24 17:20:06 +0800 | [diff] [blame] | 649 | pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap); |
Bjorn Helgaas | 231afea | 2012-12-05 13:51:18 -0700 | [diff] [blame] | 650 | bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS]; |
Matthew Wilcox | 9be60ca | 2009-12-13 08:11:33 -0500 | [diff] [blame] | 651 | |
Jiang Liu | 59875ae | 2012-07-24 17:20:06 +0800 | [diff] [blame] | 652 | pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta); |
Matthew Wilcox | 9be60ca | 2009-12-13 08:11:33 -0500 | [diff] [blame] | 653 | pcie_update_link_speed(bus, linksta); |
| 654 | } |
| 655 | } |
| 656 | |
| 657 | |
Adrian Bunk | cbd4e05 | 2008-04-18 13:53:55 -0700 | [diff] [blame] | 658 | static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, |
| 659 | struct pci_dev *bridge, int busnr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | { |
| 661 | struct pci_bus *child; |
| 662 | int i; |
Yinghai Lu | 4f53509 | 2013-01-21 13:20:52 -0800 | [diff] [blame] | 663 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
| 665 | /* |
| 666 | * Allocate a new bus, and inherit stuff from the parent.. |
| 667 | */ |
| 668 | child = pci_alloc_bus(); |
| 669 | if (!child) |
| 670 | return NULL; |
| 671 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | child->parent = parent; |
| 673 | child->ops = parent->ops; |
Thierry Reding | 0cbdcfc | 2013-08-09 22:27:08 +0200 | [diff] [blame] | 674 | child->msi = parent->msi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | child->sysdata = parent->sysdata; |
Michael S. Tsirkin | 6e325a6 | 2006-02-14 18:52:22 +0200 | [diff] [blame] | 676 | child->bus_flags = parent->bus_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 678 | /* initialize some portions of the bus device, but don't register it |
Yinghai Lu | 4f53509 | 2013-01-21 13:20:52 -0800 | [diff] [blame] | 679 | * now as the parent is not properly set up yet. |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 680 | */ |
| 681 | child->dev.class = &pcibus_class; |
Kay Sievers | 1a92713 | 2008-10-30 02:17:49 +0100 | [diff] [blame] | 682 | dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | |
| 684 | /* |
| 685 | * Set up the primary, secondary and subordinate |
| 686 | * bus numbers. |
| 687 | */ |
Yinghai Lu | b918c62 | 2012-05-17 18:51:11 -0700 | [diff] [blame] | 688 | child->number = child->busn_res.start = busnr; |
| 689 | child->primary = parent->busn_res.start; |
| 690 | child->busn_res.end = 0xff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | |
Yinghai Lu | 4f53509 | 2013-01-21 13:20:52 -0800 | [diff] [blame] | 692 | if (!bridge) { |
| 693 | child->dev.parent = parent->bridge; |
| 694 | goto add_dev; |
| 695 | } |
Yu Zhao | 3789fa8 | 2008-11-22 02:41:07 +0800 | [diff] [blame] | 696 | |
| 697 | child->self = bridge; |
| 698 | child->bridge = get_device(&bridge->dev); |
Yinghai Lu | 4f53509 | 2013-01-21 13:20:52 -0800 | [diff] [blame] | 699 | child->dev.parent = child->bridge; |
Benjamin Herrenschmidt | 98d9f30c8 | 2011-04-11 11:37:07 +1000 | [diff] [blame] | 700 | pci_set_bus_of_node(child); |
Matthew Wilcox | 9be60ca | 2009-12-13 08:11:33 -0500 | [diff] [blame] | 701 | pci_set_bus_speed(child); |
| 702 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | /* Set up default resource pointers and names.. */ |
Yu Zhao | fde09c6 | 2008-11-22 02:39:32 +0800 | [diff] [blame] | 704 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i]; |
| 706 | child->resource[i]->name = child->name; |
| 707 | } |
| 708 | bridge->subordinate = child; |
| 709 | |
Yinghai Lu | 4f53509 | 2013-01-21 13:20:52 -0800 | [diff] [blame] | 710 | add_dev: |
| 711 | ret = device_register(&child->dev); |
| 712 | WARN_ON(ret < 0); |
| 713 | |
Jiang Liu | 10a9574 | 2013-04-12 05:44:20 +0000 | [diff] [blame] | 714 | pcibios_add_bus(child); |
| 715 | |
Yinghai Lu | 4f53509 | 2013-01-21 13:20:52 -0800 | [diff] [blame] | 716 | /* Create legacy_io and legacy_mem files for this bus */ |
| 717 | pci_create_legacy_files(child); |
| 718 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | return child; |
| 720 | } |
| 721 | |
Sam Ravnborg | 451124a | 2008-02-02 22:33:43 +0100 | [diff] [blame] | 722 | struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | { |
| 724 | struct pci_bus *child; |
| 725 | |
| 726 | child = pci_alloc_child_bus(parent, dev, busnr); |
Rajesh Shah | e4ea9bb | 2005-04-28 00:25:48 -0700 | [diff] [blame] | 727 | if (child) { |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 728 | down_write(&pci_bus_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | list_add_tail(&child->node, &parent->children); |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 730 | up_write(&pci_bus_sem); |
Rajesh Shah | e4ea9bb | 2005-04-28 00:25:48 -0700 | [diff] [blame] | 731 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | return child; |
| 733 | } |
| 734 | |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 735 | static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max) |
Greg Kroah-Hartman | 26f674a | 2005-06-02 15:41:48 -0700 | [diff] [blame] | 736 | { |
| 737 | struct pci_bus *parent = child->parent; |
Ivan Kokshaysky | 12f44f4 | 2005-09-22 21:06:31 -0700 | [diff] [blame] | 738 | |
| 739 | /* Attempts to fix that up are really dangerous unless |
| 740 | we're going to re-assign all bus numbers. */ |
| 741 | if (!pcibios_assign_all_busses()) |
| 742 | return; |
| 743 | |
Yinghai Lu | b918c62 | 2012-05-17 18:51:11 -0700 | [diff] [blame] | 744 | while (parent->parent && parent->busn_res.end < max) { |
| 745 | parent->busn_res.end = max; |
Greg Kroah-Hartman | 26f674a | 2005-06-02 15:41:48 -0700 | [diff] [blame] | 746 | pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max); |
| 747 | parent = parent->parent; |
| 748 | } |
| 749 | } |
| 750 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | /* |
| 752 | * If it's a bridge, configure it and scan the bus behind it. |
| 753 | * For CardBus bridges, we don't scan behind as the devices will |
| 754 | * be handled by the bridge driver itself. |
| 755 | * |
| 756 | * We need to process bridges in two passes -- first we scan those |
| 757 | * already configured by the BIOS and after we are done with all of |
| 758 | * them, we proceed to assigning numbers to the remaining buses in |
| 759 | * order to avoid overlaps between old and new bus numbers. |
| 760 | */ |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 761 | int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | { |
| 763 | struct pci_bus *child; |
| 764 | int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 765 | u32 buses, i, j = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | u16 bctl; |
Bjorn Helgaas | 99ddd55 | 2010-03-16 15:52:58 -0600 | [diff] [blame] | 767 | u8 primary, secondary, subordinate; |
Benjamin Herrenschmidt | a1c1989 | 2008-10-21 10:06:29 +1100 | [diff] [blame] | 768 | int broken = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | |
| 770 | pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); |
Bjorn Helgaas | 99ddd55 | 2010-03-16 15:52:58 -0600 | [diff] [blame] | 771 | primary = buses & 0xFF; |
| 772 | secondary = (buses >> 8) & 0xFF; |
| 773 | subordinate = (buses >> 16) & 0xFF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
Bjorn Helgaas | 99ddd55 | 2010-03-16 15:52:58 -0600 | [diff] [blame] | 775 | dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n", |
| 776 | secondary, subordinate, pass); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | |
Yinghai Lu | 71f6bd4 | 2012-01-30 12:25:24 +0100 | [diff] [blame] | 778 | if (!primary && (primary != bus->number) && secondary && subordinate) { |
| 779 | dev_warn(&dev->dev, "Primary bus is hard wired to 0\n"); |
| 780 | primary = bus->number; |
| 781 | } |
| 782 | |
Benjamin Herrenschmidt | a1c1989 | 2008-10-21 10:06:29 +1100 | [diff] [blame] | 783 | /* Check if setup is sensible at all */ |
| 784 | if (!pass && |
Yinghai Lu | 1965f66 | 2012-09-10 17:19:33 -0700 | [diff] [blame] | 785 | (primary != bus->number || secondary <= bus->number || |
| 786 | secondary > subordinate)) { |
| 787 | dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n", |
| 788 | secondary, subordinate); |
Benjamin Herrenschmidt | a1c1989 | 2008-10-21 10:06:29 +1100 | [diff] [blame] | 789 | broken = 1; |
| 790 | } |
| 791 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | /* Disable MasterAbortMode during probing to avoid reporting |
| 793 | of bus errors (in some architectures) */ |
| 794 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl); |
| 795 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, |
| 796 | bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); |
| 797 | |
Bjorn Helgaas | 99ddd55 | 2010-03-16 15:52:58 -0600 | [diff] [blame] | 798 | if ((secondary || subordinate) && !pcibios_assign_all_busses() && |
| 799 | !is_cardbus && !broken) { |
| 800 | unsigned int cmax; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | /* |
| 802 | * Bus already configured by firmware, process it in the first |
| 803 | * pass and just note the configuration. |
| 804 | */ |
| 805 | if (pass) |
Ralf Baechle | bbe8f9a | 2006-02-14 16:23:57 +0000 | [diff] [blame] | 806 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | |
| 808 | /* |
| 809 | * If we already got to this bus through a different bridge, |
Alex Chiang | 74710de | 2009-03-20 14:56:10 -0600 | [diff] [blame] | 810 | * don't re-add it. This can happen with the i450NX chipset. |
| 811 | * |
| 812 | * However, we continue to descend down the hierarchy and |
| 813 | * scan remaining child buses. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | */ |
Bjorn Helgaas | 99ddd55 | 2010-03-16 15:52:58 -0600 | [diff] [blame] | 815 | child = pci_find_bus(pci_domain_nr(bus), secondary); |
Alex Chiang | 74710de | 2009-03-20 14:56:10 -0600 | [diff] [blame] | 816 | if (!child) { |
Bjorn Helgaas | 99ddd55 | 2010-03-16 15:52:58 -0600 | [diff] [blame] | 817 | child = pci_add_new_bus(bus, dev, secondary); |
Alex Chiang | 74710de | 2009-03-20 14:56:10 -0600 | [diff] [blame] | 818 | if (!child) |
| 819 | goto out; |
Bjorn Helgaas | 99ddd55 | 2010-03-16 15:52:58 -0600 | [diff] [blame] | 820 | child->primary = primary; |
Yinghai Lu | bc76b73 | 2012-05-17 18:51:13 -0700 | [diff] [blame] | 821 | pci_bus_insert_busn_res(child, secondary, subordinate); |
Alex Chiang | 74710de | 2009-03-20 14:56:10 -0600 | [diff] [blame] | 822 | child->bridge_ctl = bctl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | } |
| 824 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | cmax = pci_scan_child_bus(child); |
| 826 | if (cmax > max) |
| 827 | max = cmax; |
Yinghai Lu | b918c62 | 2012-05-17 18:51:11 -0700 | [diff] [blame] | 828 | if (child->busn_res.end > max) |
| 829 | max = child->busn_res.end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | } else { |
| 831 | /* |
| 832 | * We need to assign a number to this bus which we always |
| 833 | * do in the second pass. |
| 834 | */ |
Ivan Kokshaysky | 12f44f4 | 2005-09-22 21:06:31 -0700 | [diff] [blame] | 835 | if (!pass) { |
Benjamin Herrenschmidt | a1c1989 | 2008-10-21 10:06:29 +1100 | [diff] [blame] | 836 | if (pcibios_assign_all_busses() || broken) |
Ivan Kokshaysky | 12f44f4 | 2005-09-22 21:06:31 -0700 | [diff] [blame] | 837 | /* Temporarily disable forwarding of the |
| 838 | configuration cycles on all bridges in |
| 839 | this bus segment to avoid possible |
| 840 | conflicts in the second pass between two |
| 841 | bridges programmed with overlapping |
| 842 | bus ranges. */ |
| 843 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, |
| 844 | buses & ~0xffffff); |
Ralf Baechle | bbe8f9a | 2006-02-14 16:23:57 +0000 | [diff] [blame] | 845 | goto out; |
Ivan Kokshaysky | 12f44f4 | 2005-09-22 21:06:31 -0700 | [diff] [blame] | 846 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
| 848 | /* Clear errors */ |
| 849 | pci_write_config_word(dev, PCI_STATUS, 0xffff); |
| 850 | |
Rajesh Shah | cc57450 | 2005-04-28 00:25:47 -0700 | [diff] [blame] | 851 | /* Prevent assigning a bus number that already exists. |
Tiejun Chen | b1a98b6 | 2011-06-02 11:02:50 +0800 | [diff] [blame] | 852 | * This can happen when a bridge is hot-plugged, so in |
| 853 | * this case we only re-scan this bus. */ |
| 854 | child = pci_find_bus(pci_domain_nr(bus), max+1); |
| 855 | if (!child) { |
| 856 | child = pci_add_new_bus(bus, dev, ++max); |
| 857 | if (!child) |
| 858 | goto out; |
Yinghai Lu | bc76b73 | 2012-05-17 18:51:13 -0700 | [diff] [blame] | 859 | pci_bus_insert_busn_res(child, max, 0xff); |
Tiejun Chen | b1a98b6 | 2011-06-02 11:02:50 +0800 | [diff] [blame] | 860 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | buses = (buses & 0xff000000) |
| 862 | | ((unsigned int)(child->primary) << 0) |
Yinghai Lu | b918c62 | 2012-05-17 18:51:11 -0700 | [diff] [blame] | 863 | | ((unsigned int)(child->busn_res.start) << 8) |
| 864 | | ((unsigned int)(child->busn_res.end) << 16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | |
| 866 | /* |
| 867 | * yenta.c forces a secondary latency timer of 176. |
| 868 | * Copy that behaviour here. |
| 869 | */ |
| 870 | if (is_cardbus) { |
| 871 | buses &= ~0xff000000; |
| 872 | buses |= CARDBUS_LATENCY_TIMER << 24; |
| 873 | } |
Jesper Juhl | 7c867c8 | 2011-01-24 21:14:33 +0100 | [diff] [blame] | 874 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | /* |
| 876 | * We need to blast all three values with a single write. |
| 877 | */ |
| 878 | pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses); |
| 879 | |
| 880 | if (!is_cardbus) { |
Gary Hade | 1194925 | 2007-10-08 16:24:16 -0700 | [diff] [blame] | 881 | child->bridge_ctl = bctl; |
Greg Kroah-Hartman | 26f674a | 2005-06-02 15:41:48 -0700 | [diff] [blame] | 882 | /* |
| 883 | * Adjust subordinate busnr in parent buses. |
| 884 | * We do this before scanning for children because |
| 885 | * some devices may not be detected if the bios |
| 886 | * was lazy. |
| 887 | */ |
| 888 | pci_fixup_parent_subordinate_busnr(child, max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | /* Now we can scan all subordinate buses... */ |
| 890 | max = pci_scan_child_bus(child); |
Kristen Accardi | e3ac86d | 2006-01-17 16:57:01 -0800 | [diff] [blame] | 891 | /* |
| 892 | * now fix it up again since we have found |
| 893 | * the real value of max. |
| 894 | */ |
| 895 | pci_fixup_parent_subordinate_busnr(child, max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | } else { |
| 897 | /* |
| 898 | * For CardBus bridges, we leave 4 bus numbers |
| 899 | * as cards with a PCI-to-PCI bridge can be |
| 900 | * inserted later. |
| 901 | */ |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 902 | for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) { |
| 903 | struct pci_bus *parent = bus; |
Rajesh Shah | cc57450 | 2005-04-28 00:25:47 -0700 | [diff] [blame] | 904 | if (pci_find_bus(pci_domain_nr(bus), |
| 905 | max+i+1)) |
| 906 | break; |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 907 | while (parent->parent) { |
| 908 | if ((!pcibios_assign_all_busses()) && |
Yinghai Lu | b918c62 | 2012-05-17 18:51:11 -0700 | [diff] [blame] | 909 | (parent->busn_res.end > max) && |
| 910 | (parent->busn_res.end <= max+i)) { |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 911 | j = 1; |
| 912 | } |
| 913 | parent = parent->parent; |
| 914 | } |
| 915 | if (j) { |
| 916 | /* |
| 917 | * Often, there are two cardbus bridges |
| 918 | * -- try to leave one valid bus number |
| 919 | * for each one. |
| 920 | */ |
| 921 | i /= 2; |
| 922 | break; |
| 923 | } |
| 924 | } |
Rajesh Shah | cc57450 | 2005-04-28 00:25:47 -0700 | [diff] [blame] | 925 | max += i; |
Greg Kroah-Hartman | 26f674a | 2005-06-02 15:41:48 -0700 | [diff] [blame] | 926 | pci_fixup_parent_subordinate_busnr(child, max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | } |
| 928 | /* |
| 929 | * Set the subordinate bus number to its real value. |
| 930 | */ |
Yinghai Lu | bc76b73 | 2012-05-17 18:51:13 -0700 | [diff] [blame] | 931 | pci_bus_update_busn_res_end(child, max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max); |
| 933 | } |
| 934 | |
Gary Hade | cb3576f | 2008-02-08 14:00:52 -0800 | [diff] [blame] | 935 | sprintf(child->name, |
| 936 | (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"), |
| 937 | pci_domain_nr(bus), child->number); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | |
Bernhard Kaindl | d55bef51 | 2007-07-30 20:35:13 +0200 | [diff] [blame] | 939 | /* Has only triggered on CardBus, fixup is in yenta_socket */ |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 940 | while (bus->parent) { |
Yinghai Lu | b918c62 | 2012-05-17 18:51:11 -0700 | [diff] [blame] | 941 | if ((child->busn_res.end > bus->busn_res.end) || |
| 942 | (child->number > bus->busn_res.end) || |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 943 | (child->number < bus->number) || |
Yinghai Lu | b918c62 | 2012-05-17 18:51:11 -0700 | [diff] [blame] | 944 | (child->busn_res.end < bus->number)) { |
| 945 | dev_info(&child->dev, "%pR %s " |
| 946 | "hidden behind%s bridge %s %pR\n", |
| 947 | &child->busn_res, |
| 948 | (bus->number > child->busn_res.end && |
| 949 | bus->busn_res.end < child->number) ? |
Joe Perches | a6f29a9 | 2007-11-19 17:48:29 -0800 | [diff] [blame] | 950 | "wholly" : "partially", |
| 951 | bus->self->transparent ? " transparent" : "", |
Bjorn Helgaas | 865df57 | 2009-11-04 10:32:57 -0700 | [diff] [blame] | 952 | dev_name(&bus->dev), |
Yinghai Lu | b918c62 | 2012-05-17 18:51:11 -0700 | [diff] [blame] | 953 | &bus->busn_res); |
Dominik Brodowski | 4988794 | 2005-12-08 16:53:12 +0100 | [diff] [blame] | 954 | } |
| 955 | bus = bus->parent; |
| 956 | } |
| 957 | |
Ralf Baechle | bbe8f9a | 2006-02-14 16:23:57 +0000 | [diff] [blame] | 958 | out: |
| 959 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); |
| 960 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | return max; |
| 962 | } |
| 963 | |
| 964 | /* |
| 965 | * Read interrupt line and base address registers. |
| 966 | * The architecture-dependent code can tweak these, of course. |
| 967 | */ |
| 968 | static void pci_read_irq(struct pci_dev *dev) |
| 969 | { |
| 970 | unsigned char irq; |
| 971 | |
| 972 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq); |
Kristen Accardi | ffeff78 | 2005-11-02 16:24:32 -0800 | [diff] [blame] | 973 | dev->pin = irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | if (irq) |
| 975 | pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); |
| 976 | dev->irq = irq; |
| 977 | } |
| 978 | |
Benjamin Herrenschmidt | bb209c8 | 2010-01-26 17:10:03 +0000 | [diff] [blame] | 979 | void set_pcie_port_type(struct pci_dev *pdev) |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 980 | { |
| 981 | int pos; |
| 982 | u16 reg16; |
| 983 | |
| 984 | pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); |
| 985 | if (!pos) |
| 986 | return; |
| 987 | pdev->is_pcie = 1; |
Kenji Kaneshige | 0efea00 | 2009-11-05 12:05:11 +0900 | [diff] [blame] | 988 | pdev->pcie_cap = pos; |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 989 | pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); |
Yijing Wang | 786e228 | 2012-07-24 17:20:02 +0800 | [diff] [blame] | 990 | pdev->pcie_flags_reg = reg16; |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 991 | pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16); |
| 992 | pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD; |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 993 | } |
| 994 | |
Benjamin Herrenschmidt | bb209c8 | 2010-01-26 17:10:03 +0000 | [diff] [blame] | 995 | void set_pcie_hotplug_bridge(struct pci_dev *pdev) |
Eric W. Biederman | 2876048 | 2009-09-09 14:09:24 -0700 | [diff] [blame] | 996 | { |
Eric W. Biederman | 2876048 | 2009-09-09 14:09:24 -0700 | [diff] [blame] | 997 | u32 reg32; |
| 998 | |
Jiang Liu | 59875ae | 2012-07-24 17:20:06 +0800 | [diff] [blame] | 999 | pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32); |
Eric W. Biederman | 2876048 | 2009-09-09 14:09:24 -0700 | [diff] [blame] | 1000 | if (reg32 & PCI_EXP_SLTCAP_HPC) |
| 1001 | pdev->is_hotplug_bridge = 1; |
| 1002 | } |
| 1003 | |
Bartlomiej Zolnierkiewicz | 01abc2a | 2007-04-23 23:19:36 +0200 | [diff] [blame] | 1004 | #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED) |
Randy Dunlap | 76e6a1d | 2006-12-29 16:47:29 -0800 | [diff] [blame] | 1005 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | /** |
| 1007 | * pci_setup_device - fill in class and map information of a device |
| 1008 | * @dev: the device structure to fill |
| 1009 | * |
| 1010 | * Initialize the device structure with information about the device's |
| 1011 | * vendor,class,memory and IO-space addresses,IRQ lines etc. |
| 1012 | * Called at initialisation of the PCI subsystem and by CardBus services. |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 1013 | * Returns 0 on success and negative if unknown type of device (not normal, |
| 1014 | * bridge or CardBus). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | */ |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 1016 | int pci_setup_device(struct pci_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | { |
| 1018 | u32 class; |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 1019 | u8 hdr_type; |
| 1020 | struct pci_slot *slot; |
Gabe Black | bc577d2 | 2009-10-06 10:45:19 -0500 | [diff] [blame] | 1021 | int pos = 0; |
Bjorn Helgaas | 5bfa14e | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 1022 | struct pci_bus_region region; |
| 1023 | struct resource *res; |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 1024 | |
| 1025 | if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type)) |
| 1026 | return -EIO; |
| 1027 | |
| 1028 | dev->sysdata = dev->bus->sysdata; |
| 1029 | dev->dev.parent = dev->bus->bridge; |
| 1030 | dev->dev.bus = &pci_bus_type; |
| 1031 | dev->hdr_type = hdr_type & 0x7f; |
| 1032 | dev->multifunction = !!(hdr_type & 0x80); |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 1033 | dev->error_state = pci_channel_io_normal; |
| 1034 | set_pcie_port_type(dev); |
| 1035 | |
| 1036 | list_for_each_entry(slot, &dev->bus->slots, list) |
| 1037 | if (PCI_SLOT(dev->devfn) == slot->number) |
| 1038 | dev->slot = slot; |
| 1039 | |
| 1040 | /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer) |
| 1041 | set this higher, assuming the system even supports it. */ |
| 1042 | dev->dma_mask = 0xffffffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | |
Greg Kroah-Hartman | eebfcfb | 2008-07-02 13:24:49 -0700 | [diff] [blame] | 1044 | dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus), |
| 1045 | dev->bus->number, PCI_SLOT(dev->devfn), |
| 1046 | PCI_FUNC(dev->devfn)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | |
| 1048 | pci_read_config_dword(dev, PCI_CLASS_REVISION, &class); |
Auke Kok | b8a3a52 | 2007-06-08 15:46:30 -0700 | [diff] [blame] | 1049 | dev->revision = class & 0xff; |
Yinghai Lu | 2dd8ba9 | 2012-02-19 14:50:12 -0800 | [diff] [blame] | 1050 | dev->class = class >> 8; /* upper 3 bytes */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | |
Yinghai Lu | 2dd8ba9 | 2012-02-19 14:50:12 -0800 | [diff] [blame] | 1052 | dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n", |
| 1053 | dev->vendor, dev->device, dev->hdr_type, dev->class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | |
Yu Zhao | 853346e | 2009-03-21 22:05:11 +0800 | [diff] [blame] | 1055 | /* need to have dev->class ready */ |
| 1056 | dev->cfg_size = pci_cfg_space_size(dev); |
| 1057 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | /* "Unknown power state" */ |
Daniel Ritz | 3fe9d19 | 2005-08-17 15:32:19 -0700 | [diff] [blame] | 1059 | dev->current_state = PCI_UNKNOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | |
| 1061 | /* Early fixups, before probing the BARs */ |
| 1062 | pci_fixup_device(pci_fixup_early, dev); |
Yu Zhao | f79b1b1 | 2009-05-28 00:25:05 +0800 | [diff] [blame] | 1063 | /* device class may be changed after fixup */ |
| 1064 | class = dev->class >> 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | |
| 1066 | switch (dev->hdr_type) { /* header type */ |
| 1067 | case PCI_HEADER_TYPE_NORMAL: /* standard header */ |
| 1068 | if (class == PCI_CLASS_BRIDGE_PCI) |
| 1069 | goto bad; |
| 1070 | pci_read_irq(dev); |
| 1071 | pci_read_bases(dev, 6, PCI_ROM_ADDRESS); |
| 1072 | pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); |
| 1073 | pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device); |
Alan Cox | 368c73d | 2006-10-04 00:41:26 +0100 | [diff] [blame] | 1074 | |
| 1075 | /* |
| 1076 | * Do the ugly legacy mode stuff here rather than broken chip |
| 1077 | * quirk code. Legacy mode ATA controllers have fixed |
| 1078 | * addresses. These are not always echoed in BAR0-3, and |
| 1079 | * BAR0-3 in a few cases contain junk! |
| 1080 | */ |
| 1081 | if (class == PCI_CLASS_STORAGE_IDE) { |
| 1082 | u8 progif; |
| 1083 | pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); |
| 1084 | if ((progif & 1) == 0) { |
Bjorn Helgaas | 5bfa14e | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 1085 | region.start = 0x1F0; |
| 1086 | region.end = 0x1F7; |
| 1087 | res = &dev->resource[0]; |
| 1088 | res->flags = LEGACY_IO_RESOURCE; |
Bjorn Helgaas | fb127cb | 2012-02-23 20:19:04 -0700 | [diff] [blame] | 1089 | pcibios_bus_to_resource(dev, res, ®ion); |
Bjorn Helgaas | 5bfa14e | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 1090 | region.start = 0x3F6; |
| 1091 | region.end = 0x3F6; |
| 1092 | res = &dev->resource[1]; |
| 1093 | res->flags = LEGACY_IO_RESOURCE; |
Bjorn Helgaas | fb127cb | 2012-02-23 20:19:04 -0700 | [diff] [blame] | 1094 | pcibios_bus_to_resource(dev, res, ®ion); |
Alan Cox | 368c73d | 2006-10-04 00:41:26 +0100 | [diff] [blame] | 1095 | } |
| 1096 | if ((progif & 4) == 0) { |
Bjorn Helgaas | 5bfa14e | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 1097 | region.start = 0x170; |
| 1098 | region.end = 0x177; |
| 1099 | res = &dev->resource[2]; |
| 1100 | res->flags = LEGACY_IO_RESOURCE; |
Bjorn Helgaas | fb127cb | 2012-02-23 20:19:04 -0700 | [diff] [blame] | 1101 | pcibios_bus_to_resource(dev, res, ®ion); |
Bjorn Helgaas | 5bfa14e | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 1102 | region.start = 0x376; |
| 1103 | region.end = 0x376; |
| 1104 | res = &dev->resource[3]; |
| 1105 | res->flags = LEGACY_IO_RESOURCE; |
Bjorn Helgaas | fb127cb | 2012-02-23 20:19:04 -0700 | [diff] [blame] | 1106 | pcibios_bus_to_resource(dev, res, ®ion); |
Alan Cox | 368c73d | 2006-10-04 00:41:26 +0100 | [diff] [blame] | 1107 | } |
| 1108 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | break; |
| 1110 | |
| 1111 | case PCI_HEADER_TYPE_BRIDGE: /* bridge header */ |
| 1112 | if (class != PCI_CLASS_BRIDGE_PCI) |
| 1113 | goto bad; |
| 1114 | /* The PCI-to-PCI bridge spec requires that subtractive |
| 1115 | decoding (i.e. transparent) bridge must have programming |
| 1116 | interface code of 0x01. */ |
Kristen Accardi | 3efd273 | 2005-11-02 16:55:49 -0800 | [diff] [blame] | 1117 | pci_read_irq(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | dev->transparent = ((dev->class & 0xff) == 1); |
| 1119 | pci_read_bases(dev, 2, PCI_ROM_ADDRESS1); |
Eric W. Biederman | 2876048 | 2009-09-09 14:09:24 -0700 | [diff] [blame] | 1120 | set_pcie_hotplug_bridge(dev); |
Gabe Black | bc577d2 | 2009-10-06 10:45:19 -0500 | [diff] [blame] | 1121 | pos = pci_find_capability(dev, PCI_CAP_ID_SSVID); |
| 1122 | if (pos) { |
| 1123 | pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor); |
| 1124 | pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device); |
| 1125 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | break; |
| 1127 | |
| 1128 | case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */ |
| 1129 | if (class != PCI_CLASS_BRIDGE_CARDBUS) |
| 1130 | goto bad; |
| 1131 | pci_read_irq(dev); |
| 1132 | pci_read_bases(dev, 1, 0); |
| 1133 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor); |
| 1134 | pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device); |
| 1135 | break; |
| 1136 | |
| 1137 | default: /* unknown header */ |
Bjorn Helgaas | 80ccba1 | 2008-06-13 10:52:11 -0600 | [diff] [blame] | 1138 | dev_err(&dev->dev, "unknown header type %02x, " |
| 1139 | "ignoring device\n", dev->hdr_type); |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 1140 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | |
| 1142 | bad: |
Yinghai Lu | 2dd8ba9 | 2012-02-19 14:50:12 -0800 | [diff] [blame] | 1143 | dev_err(&dev->dev, "ignoring class %#08x (doesn't match header " |
| 1144 | "type %02x)\n", dev->class, dev->hdr_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | dev->class = PCI_CLASS_NOT_DEFINED; |
| 1146 | } |
| 1147 | |
| 1148 | /* We found a fine healthy device, go go go... */ |
| 1149 | return 0; |
| 1150 | } |
| 1151 | |
Zhao, Yu | 201de56 | 2008-10-13 19:49:55 +0800 | [diff] [blame] | 1152 | static void pci_release_capabilities(struct pci_dev *dev) |
| 1153 | { |
| 1154 | pci_vpd_release(dev); |
Yu Zhao | d1b054d | 2009-03-20 11:25:11 +0800 | [diff] [blame] | 1155 | pci_iov_release(dev); |
Yinghai Lu | f796841 | 2012-02-11 00:18:30 -0800 | [diff] [blame] | 1156 | pci_free_cap_save_buffers(dev); |
Zhao, Yu | 201de56 | 2008-10-13 19:49:55 +0800 | [diff] [blame] | 1157 | } |
| 1158 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | /** |
| 1160 | * pci_release_dev - free a pci device structure when all users of it are finished. |
| 1161 | * @dev: device that's been disconnected |
| 1162 | * |
| 1163 | * Will be called only by the device core when all users of this pci device are |
| 1164 | * done. |
| 1165 | */ |
| 1166 | static void pci_release_dev(struct device *dev) |
| 1167 | { |
| 1168 | struct pci_dev *pci_dev; |
| 1169 | |
| 1170 | pci_dev = to_pci_dev(dev); |
Zhao, Yu | 201de56 | 2008-10-13 19:49:55 +0800 | [diff] [blame] | 1171 | pci_release_capabilities(pci_dev); |
Benjamin Herrenschmidt | 98d9f30c8 | 2011-04-11 11:37:07 +1000 | [diff] [blame] | 1172 | pci_release_of_node(pci_dev); |
Sebastian Ott | 6ae32c5 | 2013-06-04 19:18:14 +0200 | [diff] [blame] | 1173 | pcibios_release_device(pci_dev); |
Gu Zheng | 8b1fce0 | 2013-05-25 21:48:31 +0800 | [diff] [blame] | 1174 | pci_bus_put(pci_dev->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | kfree(pci_dev); |
| 1176 | } |
| 1177 | |
| 1178 | /** |
| 1179 | * pci_cfg_space_size - get the configuration space size of the PCI device. |
Randy Dunlap | 8f7020d | 2005-10-23 11:57:38 -0700 | [diff] [blame] | 1180 | * @dev: PCI device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | * |
| 1182 | * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices |
| 1183 | * have 4096 bytes. Even if the device is capable, that doesn't mean we can |
| 1184 | * access it. Maybe we don't have a way to generate extended config space |
| 1185 | * accesses, or the device is behind a reverse Express bridge. So we try |
| 1186 | * reading the dword at 0x100 which must either be 0 or a valid extended |
| 1187 | * capability header. |
| 1188 | */ |
Yinghai Lu | 70b9f7d | 2008-04-28 16:27:23 -0700 | [diff] [blame] | 1189 | int pci_cfg_space_size_ext(struct pci_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | u32 status; |
Zhao, Yu | 557848c | 2008-10-13 19:18:07 +0800 | [diff] [blame] | 1192 | int pos = PCI_CFG_SPACE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | |
Zhao, Yu | 557848c | 2008-10-13 19:18:07 +0800 | [diff] [blame] | 1194 | if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | goto fail; |
| 1196 | if (status == 0xffffffff) |
| 1197 | goto fail; |
| 1198 | |
| 1199 | return PCI_CFG_SPACE_EXP_SIZE; |
| 1200 | |
| 1201 | fail: |
| 1202 | return PCI_CFG_SPACE_SIZE; |
| 1203 | } |
| 1204 | |
Yinghai Lu | 57741a7 | 2008-02-15 01:32:50 -0800 | [diff] [blame] | 1205 | int pci_cfg_space_size(struct pci_dev *dev) |
| 1206 | { |
Yinghai Lu | 70b9f7d | 2008-04-28 16:27:23 -0700 | [diff] [blame] | 1207 | int pos; |
| 1208 | u32 status; |
Yinghai Lu | dfadd9ed | 2009-03-08 21:35:37 -0700 | [diff] [blame] | 1209 | u16 class; |
| 1210 | |
| 1211 | class = dev->class >> 8; |
| 1212 | if (class == PCI_CLASS_BRIDGE_HOST) |
| 1213 | return pci_cfg_space_size_ext(dev); |
Yinghai Lu | 70b9f7d | 2008-04-28 16:27:23 -0700 | [diff] [blame] | 1214 | |
Jiang Liu | 59875ae | 2012-07-24 17:20:06 +0800 | [diff] [blame] | 1215 | if (!pci_is_pcie(dev)) { |
Yinghai Lu | 70b9f7d | 2008-04-28 16:27:23 -0700 | [diff] [blame] | 1216 | pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); |
| 1217 | if (!pos) |
| 1218 | goto fail; |
| 1219 | |
| 1220 | pci_read_config_dword(dev, pos + PCI_X_STATUS, &status); |
| 1221 | if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))) |
| 1222 | goto fail; |
| 1223 | } |
| 1224 | |
| 1225 | return pci_cfg_space_size_ext(dev); |
| 1226 | |
| 1227 | fail: |
| 1228 | return PCI_CFG_SPACE_SIZE; |
Yinghai Lu | 57741a7 | 2008-02-15 01:32:50 -0800 | [diff] [blame] | 1229 | } |
| 1230 | |
Gu Zheng | 3c6e6ae | 2013-05-25 21:48:30 +0800 | [diff] [blame] | 1231 | struct pci_dev *pci_alloc_dev(struct pci_bus *bus) |
Michael Ellerman | 6589121 | 2007-04-05 17:19:08 +1000 | [diff] [blame] | 1232 | { |
| 1233 | struct pci_dev *dev; |
| 1234 | |
| 1235 | dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL); |
| 1236 | if (!dev) |
| 1237 | return NULL; |
| 1238 | |
Michael Ellerman | 6589121 | 2007-04-05 17:19:08 +1000 | [diff] [blame] | 1239 | INIT_LIST_HEAD(&dev->bus_list); |
Brian King | 88e7b16 | 2013-04-08 03:05:07 +0000 | [diff] [blame] | 1240 | dev->dev.type = &pci_dev_type; |
Gu Zheng | 3c6e6ae | 2013-05-25 21:48:30 +0800 | [diff] [blame] | 1241 | dev->bus = pci_bus_get(bus); |
Michael Ellerman | 6589121 | 2007-04-05 17:19:08 +1000 | [diff] [blame] | 1242 | |
| 1243 | return dev; |
| 1244 | } |
Gu Zheng | 3c6e6ae | 2013-05-25 21:48:30 +0800 | [diff] [blame] | 1245 | EXPORT_SYMBOL(pci_alloc_dev); |
| 1246 | |
| 1247 | struct pci_dev *alloc_pci_dev(void) |
| 1248 | { |
| 1249 | return pci_alloc_dev(NULL); |
| 1250 | } |
Michael Ellerman | 6589121 | 2007-04-05 17:19:08 +1000 | [diff] [blame] | 1251 | EXPORT_SYMBOL(alloc_pci_dev); |
| 1252 | |
Yinghai Lu | efdc87d | 2012-01-27 10:55:10 -0800 | [diff] [blame] | 1253 | bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l, |
| 1254 | int crs_timeout) |
| 1255 | { |
| 1256 | int delay = 1; |
| 1257 | |
| 1258 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l)) |
| 1259 | return false; |
| 1260 | |
| 1261 | /* some broken boards return 0 or ~0 if a slot is empty: */ |
| 1262 | if (*l == 0xffffffff || *l == 0x00000000 || |
| 1263 | *l == 0x0000ffff || *l == 0xffff0000) |
| 1264 | return false; |
| 1265 | |
| 1266 | /* Configuration request Retry Status */ |
| 1267 | while (*l == 0xffff0001) { |
| 1268 | if (!crs_timeout) |
| 1269 | return false; |
| 1270 | |
| 1271 | msleep(delay); |
| 1272 | delay *= 2; |
| 1273 | if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l)) |
| 1274 | return false; |
| 1275 | /* Card hasn't responded in 60 seconds? Must be stuck. */ |
| 1276 | if (delay > crs_timeout) { |
| 1277 | printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not " |
| 1278 | "responding\n", pci_domain_nr(bus), |
| 1279 | bus->number, PCI_SLOT(devfn), |
| 1280 | PCI_FUNC(devfn)); |
| 1281 | return false; |
| 1282 | } |
| 1283 | } |
| 1284 | |
| 1285 | return true; |
| 1286 | } |
| 1287 | EXPORT_SYMBOL(pci_bus_read_dev_vendor_id); |
| 1288 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | /* |
| 1290 | * Read the config data for a PCI device, sanity-check it |
| 1291 | * and fill in the dev structure... |
| 1292 | */ |
Adrian Bunk | 7f7b5de | 2008-04-18 13:53:55 -0700 | [diff] [blame] | 1293 | static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | { |
| 1295 | struct pci_dev *dev; |
| 1296 | u32 l; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | |
Yinghai Lu | efdc87d | 2012-01-27 10:55:10 -0800 | [diff] [blame] | 1298 | if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | return NULL; |
| 1300 | |
Gu Zheng | 8b1fce0 | 2013-05-25 21:48:31 +0800 | [diff] [blame] | 1301 | dev = pci_alloc_dev(bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | if (!dev) |
| 1303 | return NULL; |
| 1304 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | dev->devfn = devfn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | dev->vendor = l & 0xffff; |
| 1307 | dev->device = (l >> 16) & 0xffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | |
Benjamin Herrenschmidt | 98d9f30c8 | 2011-04-11 11:37:07 +1000 | [diff] [blame] | 1309 | pci_set_of_node(dev); |
| 1310 | |
Yu Zhao | 480b93b | 2009-03-20 11:25:14 +0800 | [diff] [blame] | 1311 | if (pci_setup_device(dev)) { |
Gu Zheng | 8b1fce0 | 2013-05-25 21:48:31 +0800 | [diff] [blame] | 1312 | pci_bus_put(dev->bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | kfree(dev); |
| 1314 | return NULL; |
| 1315 | } |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1316 | |
| 1317 | return dev; |
| 1318 | } |
| 1319 | |
Zhao, Yu | 201de56 | 2008-10-13 19:49:55 +0800 | [diff] [blame] | 1320 | static void pci_init_capabilities(struct pci_dev *dev) |
| 1321 | { |
| 1322 | /* MSI/MSI-X list */ |
| 1323 | pci_msi_init_pci_dev(dev); |
| 1324 | |
Rafael J. Wysocki | 63f4898 | 2008-12-07 22:02:58 +0100 | [diff] [blame] | 1325 | /* Buffers for saving PCIe and PCI-X capabilities */ |
| 1326 | pci_allocate_cap_save_buffers(dev); |
| 1327 | |
Zhao, Yu | 201de56 | 2008-10-13 19:49:55 +0800 | [diff] [blame] | 1328 | /* Power Management */ |
| 1329 | pci_pm_init(dev); |
| 1330 | |
| 1331 | /* Vital Product Data */ |
| 1332 | pci_vpd_pci22_init(dev); |
Yu Zhao | 58c3a72 | 2008-10-14 14:02:53 +0800 | [diff] [blame] | 1333 | |
| 1334 | /* Alternative Routing-ID Forwarding */ |
Yijing Wang | 31ab247 | 2013-01-15 11:12:17 +0800 | [diff] [blame] | 1335 | pci_configure_ari(dev); |
Yu Zhao | d1b054d | 2009-03-20 11:25:11 +0800 | [diff] [blame] | 1336 | |
| 1337 | /* Single Root I/O Virtualization */ |
| 1338 | pci_iov_init(dev); |
Allen Kay | ae21ee6 | 2009-10-07 10:27:17 -0700 | [diff] [blame] | 1339 | |
| 1340 | /* Enable ACS P2P upstream forwarding */ |
Chris Wright | 5d990b6 | 2009-12-04 12:15:21 -0800 | [diff] [blame] | 1341 | pci_enable_acs(dev); |
Zhao, Yu | 201de56 | 2008-10-13 19:49:55 +0800 | [diff] [blame] | 1342 | } |
| 1343 | |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 1344 | void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1345 | { |
Yinghai Lu | 4f53509 | 2013-01-21 13:20:52 -0800 | [diff] [blame] | 1346 | int ret; |
| 1347 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | device_initialize(&dev->dev); |
| 1349 | dev->dev.release = pci_release_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | |
Yinghai Lu | 7629d19 | 2013-01-21 13:20:44 -0800 | [diff] [blame] | 1351 | set_dev_node(&dev->dev, pcibus_to_node(bus)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | dev->dev.dma_mask = &dev->dma_mask; |
FUJITA Tomonori | 4d57cdf | 2008-02-04 22:27:55 -0800 | [diff] [blame] | 1353 | dev->dev.dma_parms = &dev->dma_parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | dev->dev.coherent_dma_mask = 0xffffffffull; |
| 1355 | |
FUJITA Tomonori | 4d57cdf | 2008-02-04 22:27:55 -0800 | [diff] [blame] | 1356 | pci_set_dma_max_seg_size(dev, 65536); |
FUJITA Tomonori | 59fc67d | 2008-02-04 22:28:14 -0800 | [diff] [blame] | 1357 | pci_set_dma_seg_boundary(dev, 0xffffffff); |
FUJITA Tomonori | 4d57cdf | 2008-02-04 22:27:55 -0800 | [diff] [blame] | 1358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | /* Fix up broken headers */ |
| 1360 | pci_fixup_device(pci_fixup_header, dev); |
| 1361 | |
Yinghai Lu | 2069ecf | 2012-02-15 21:40:31 -0800 | [diff] [blame] | 1362 | /* moved out from quirk header fixup code */ |
| 1363 | pci_reassigndev_resource_alignment(dev); |
| 1364 | |
Rafael J. Wysocki | 4b77b0a | 2009-09-09 23:49:59 +0200 | [diff] [blame] | 1365 | /* Clear the state_saved flag. */ |
| 1366 | dev->state_saved = false; |
| 1367 | |
Zhao, Yu | 201de56 | 2008-10-13 19:49:55 +0800 | [diff] [blame] | 1368 | /* Initialize various capabilities */ |
| 1369 | pci_init_capabilities(dev); |
Rafael J. Wysocki | eb9d0fe | 2008-07-07 03:34:48 +0200 | [diff] [blame] | 1370 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | /* |
| 1372 | * Add the device to our list of discovered devices |
| 1373 | * and the bus list for fixup functions, etc. |
| 1374 | */ |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 1375 | down_write(&pci_bus_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | list_add_tail(&dev->bus_list, &bus->devices); |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 1377 | up_write(&pci_bus_sem); |
Yinghai Lu | 4f53509 | 2013-01-21 13:20:52 -0800 | [diff] [blame] | 1378 | |
Yinghai Lu | 4f53509 | 2013-01-21 13:20:52 -0800 | [diff] [blame] | 1379 | ret = pcibios_add_device(dev); |
| 1380 | WARN_ON(ret < 0); |
| 1381 | |
| 1382 | /* Notifier could use PCI capabilities */ |
| 1383 | dev->match_driver = false; |
| 1384 | ret = device_add(&dev->dev); |
| 1385 | WARN_ON(ret < 0); |
| 1386 | |
| 1387 | pci_proc_attach_device(dev); |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1388 | } |
| 1389 | |
Sam Ravnborg | 451124a | 2008-02-02 22:33:43 +0100 | [diff] [blame] | 1390 | struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn) |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1391 | { |
| 1392 | struct pci_dev *dev; |
| 1393 | |
Trent Piepho | 90bdb31 | 2009-03-20 14:56:00 -0600 | [diff] [blame] | 1394 | dev = pci_get_slot(bus, devfn); |
| 1395 | if (dev) { |
| 1396 | pci_dev_put(dev); |
| 1397 | return dev; |
| 1398 | } |
| 1399 | |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1400 | dev = pci_scan_device(bus, devfn); |
| 1401 | if (!dev) |
| 1402 | return NULL; |
| 1403 | |
| 1404 | pci_device_add(dev, bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | |
| 1406 | return dev; |
| 1407 | } |
Adrian Bunk | b73e968 | 2007-11-21 15:07:11 -0800 | [diff] [blame] | 1408 | EXPORT_SYMBOL(pci_scan_single_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | |
Yijing Wang | b1bd58e | 2013-01-25 09:12:31 -0700 | [diff] [blame] | 1410 | static unsigned next_fn(struct pci_bus *bus, struct pci_dev *dev, unsigned fn) |
Matthew Wilcox | f07852d | 2009-12-13 08:10:02 -0500 | [diff] [blame] | 1411 | { |
Yijing Wang | b1bd58e | 2013-01-25 09:12:31 -0700 | [diff] [blame] | 1412 | int pos; |
| 1413 | u16 cap = 0; |
| 1414 | unsigned next_fn; |
Matthew Wilcox | 4fb88c1 | 2010-01-17 14:01:41 -0700 | [diff] [blame] | 1415 | |
Yijing Wang | b1bd58e | 2013-01-25 09:12:31 -0700 | [diff] [blame] | 1416 | if (pci_ari_enabled(bus)) { |
| 1417 | if (!dev) |
| 1418 | return 0; |
| 1419 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI); |
| 1420 | if (!pos) |
| 1421 | return 0; |
Matthew Wilcox | 4fb88c1 | 2010-01-17 14:01:41 -0700 | [diff] [blame] | 1422 | |
Yijing Wang | b1bd58e | 2013-01-25 09:12:31 -0700 | [diff] [blame] | 1423 | pci_read_config_word(dev, pos + PCI_ARI_CAP, &cap); |
| 1424 | next_fn = PCI_ARI_CAP_NFN(cap); |
| 1425 | if (next_fn <= fn) |
| 1426 | return 0; /* protect against malformed list */ |
Matthew Wilcox | f07852d | 2009-12-13 08:10:02 -0500 | [diff] [blame] | 1427 | |
Yijing Wang | b1bd58e | 2013-01-25 09:12:31 -0700 | [diff] [blame] | 1428 | return next_fn; |
| 1429 | } |
Matthew Wilcox | f07852d | 2009-12-13 08:10:02 -0500 | [diff] [blame] | 1430 | |
Yijing Wang | b1bd58e | 2013-01-25 09:12:31 -0700 | [diff] [blame] | 1431 | /* dev may be NULL for non-contiguous multifunction devices */ |
| 1432 | if (!dev || dev->multifunction) |
| 1433 | return (fn + 1) % 8; |
| 1434 | |
Matthew Wilcox | f07852d | 2009-12-13 08:10:02 -0500 | [diff] [blame] | 1435 | return 0; |
| 1436 | } |
| 1437 | |
| 1438 | static int only_one_child(struct pci_bus *bus) |
| 1439 | { |
| 1440 | struct pci_dev *parent = bus->self; |
Bjorn Helgaas | 284f5f9 | 2012-04-30 15:21:02 -0600 | [diff] [blame] | 1441 | |
Matthew Wilcox | f07852d | 2009-12-13 08:10:02 -0500 | [diff] [blame] | 1442 | if (!parent || !pci_is_pcie(parent)) |
| 1443 | return 0; |
Yijing Wang | 62f87c0 | 2012-07-24 17:20:03 +0800 | [diff] [blame] | 1444 | if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT) |
Bjorn Helgaas | 284f5f9 | 2012-04-30 15:21:02 -0600 | [diff] [blame] | 1445 | return 1; |
Yijing Wang | 62f87c0 | 2012-07-24 17:20:03 +0800 | [diff] [blame] | 1446 | if (pci_pcie_type(parent) == PCI_EXP_TYPE_DOWNSTREAM && |
Bjorn Helgaas | 284f5f9 | 2012-04-30 15:21:02 -0600 | [diff] [blame] | 1447 | !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS)) |
Matthew Wilcox | f07852d | 2009-12-13 08:10:02 -0500 | [diff] [blame] | 1448 | return 1; |
| 1449 | return 0; |
| 1450 | } |
| 1451 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | /** |
| 1453 | * pci_scan_slot - scan a PCI slot on a bus for devices. |
| 1454 | * @bus: PCI bus to scan |
| 1455 | * @devfn: slot number to scan (must have zero function.) |
| 1456 | * |
| 1457 | * Scan a PCI slot on the specified PCI bus for devices, adding |
| 1458 | * discovered devices to the @bus->devices list. New devices |
Greg Kroah-Hartman | 8a1bc90 | 2008-02-14 14:56:56 -0800 | [diff] [blame] | 1459 | * will not have is_added set. |
Trent Piepho | 1b69dfc | 2009-03-20 14:56:05 -0600 | [diff] [blame] | 1460 | * |
| 1461 | * Returns the number of new devices found. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | */ |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 1463 | int pci_scan_slot(struct pci_bus *bus, int devfn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | { |
Matthew Wilcox | f07852d | 2009-12-13 08:10:02 -0500 | [diff] [blame] | 1465 | unsigned fn, nr = 0; |
Trent Piepho | 1b69dfc | 2009-03-20 14:56:05 -0600 | [diff] [blame] | 1466 | struct pci_dev *dev; |
Matthew Wilcox | f07852d | 2009-12-13 08:10:02 -0500 | [diff] [blame] | 1467 | |
| 1468 | if (only_one_child(bus) && (devfn > 0)) |
| 1469 | return 0; /* Already scanned the entire slot */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | |
Trent Piepho | 1b69dfc | 2009-03-20 14:56:05 -0600 | [diff] [blame] | 1471 | dev = pci_scan_single_device(bus, devfn); |
Matthew Wilcox | 4fb88c1 | 2010-01-17 14:01:41 -0700 | [diff] [blame] | 1472 | if (!dev) |
| 1473 | return 0; |
| 1474 | if (!dev->is_added) |
Trent Piepho | 1b69dfc | 2009-03-20 14:56:05 -0600 | [diff] [blame] | 1475 | nr++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | |
Yijing Wang | b1bd58e | 2013-01-25 09:12:31 -0700 | [diff] [blame] | 1477 | for (fn = next_fn(bus, dev, 0); fn > 0; fn = next_fn(bus, dev, fn)) { |
Matthew Wilcox | f07852d | 2009-12-13 08:10:02 -0500 | [diff] [blame] | 1478 | dev = pci_scan_single_device(bus, devfn + fn); |
| 1479 | if (dev) { |
| 1480 | if (!dev->is_added) |
| 1481 | nr++; |
| 1482 | dev->multifunction = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | } |
| 1484 | } |
Shaohua Li | 7d715a6 | 2008-02-25 09:46:41 +0800 | [diff] [blame] | 1485 | |
Shaohua Li | 149e163 | 2008-07-23 10:32:31 +0800 | [diff] [blame] | 1486 | /* only one slot has pcie device */ |
| 1487 | if (bus->self && nr) |
Shaohua Li | 7d715a6 | 2008-02-25 09:46:41 +0800 | [diff] [blame] | 1488 | pcie_aspm_init_link_state(bus->self); |
| 1489 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | return nr; |
| 1491 | } |
| 1492 | |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1493 | static int pcie_find_smpss(struct pci_dev *dev, void *data) |
| 1494 | { |
| 1495 | u8 *smpss = data; |
| 1496 | |
| 1497 | if (!pci_is_pcie(dev)) |
| 1498 | return 0; |
| 1499 | |
Yijing Wang | d4aa68f | 2013-08-22 11:24:47 +0800 | [diff] [blame] | 1500 | /* |
| 1501 | * We don't have a way to change MPS settings on devices that have |
| 1502 | * drivers attached. A hot-added device might support only the minimum |
| 1503 | * MPS setting (MPS=128). Therefore, if the fabric contains a bridge |
| 1504 | * where devices may be hot-added, we limit the fabric MPS to 128 so |
| 1505 | * hot-added devices will work correctly. |
| 1506 | * |
| 1507 | * However, if we hot-add a device to a slot directly below a Root |
| 1508 | * Port, it's impossible for there to be other existing devices below |
| 1509 | * the port. We don't limit the MPS in this case because we can |
| 1510 | * reconfigure MPS on both the Root Port and the hot-added device, |
| 1511 | * and there are no other devices involved. |
| 1512 | * |
| 1513 | * Note that this PCIE_BUS_SAFE path assumes no peer-to-peer DMA. |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1514 | */ |
Yijing Wang | d4aa68f | 2013-08-22 11:24:47 +0800 | [diff] [blame] | 1515 | if (dev->is_hotplug_bridge && |
| 1516 | pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1517 | *smpss = 0; |
| 1518 | |
| 1519 | if (*smpss > dev->pcie_mpss) |
| 1520 | *smpss = dev->pcie_mpss; |
| 1521 | |
| 1522 | return 0; |
| 1523 | } |
| 1524 | |
| 1525 | static void pcie_write_mps(struct pci_dev *dev, int mps) |
| 1526 | { |
Jon Mason | 62f392e | 2011-10-14 14:56:14 -0500 | [diff] [blame] | 1527 | int rc; |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1528 | |
| 1529 | if (pcie_bus_config == PCIE_BUS_PERFORMANCE) { |
Jon Mason | 62f392e | 2011-10-14 14:56:14 -0500 | [diff] [blame] | 1530 | mps = 128 << dev->pcie_mpss; |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1531 | |
Yijing Wang | 62f87c0 | 2012-07-24 17:20:03 +0800 | [diff] [blame] | 1532 | if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT && |
| 1533 | dev->bus->self) |
Jon Mason | 62f392e | 2011-10-14 14:56:14 -0500 | [diff] [blame] | 1534 | /* For "Performance", the assumption is made that |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1535 | * downstream communication will never be larger than |
| 1536 | * the MRRS. So, the MPS only needs to be configured |
| 1537 | * for the upstream communication. This being the case, |
| 1538 | * walk from the top down and set the MPS of the child |
| 1539 | * to that of the parent bus. |
Jon Mason | 62f392e | 2011-10-14 14:56:14 -0500 | [diff] [blame] | 1540 | * |
| 1541 | * Configure the device MPS with the smaller of the |
| 1542 | * device MPSS or the bridge MPS (which is assumed to be |
| 1543 | * properly configured at this point to the largest |
| 1544 | * allowable MPS based on its parent bus). |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1545 | */ |
Jon Mason | 62f392e | 2011-10-14 14:56:14 -0500 | [diff] [blame] | 1546 | mps = min(mps, pcie_get_mps(dev->bus->self)); |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1547 | } |
| 1548 | |
| 1549 | rc = pcie_set_mps(dev, mps); |
| 1550 | if (rc) |
| 1551 | dev_err(&dev->dev, "Failed attempting to set the MPS\n"); |
| 1552 | } |
| 1553 | |
Jon Mason | 62f392e | 2011-10-14 14:56:14 -0500 | [diff] [blame] | 1554 | static void pcie_write_mrrs(struct pci_dev *dev) |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1555 | { |
Jon Mason | 62f392e | 2011-10-14 14:56:14 -0500 | [diff] [blame] | 1556 | int rc, mrrs; |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1557 | |
Jon Mason | ed2888e | 2011-09-08 16:41:18 -0500 | [diff] [blame] | 1558 | /* In the "safe" case, do not configure the MRRS. There appear to be |
| 1559 | * issues with setting MRRS to 0 on a number of devices. |
| 1560 | */ |
Jon Mason | ed2888e | 2011-09-08 16:41:18 -0500 | [diff] [blame] | 1561 | if (pcie_bus_config != PCIE_BUS_PERFORMANCE) |
| 1562 | return; |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1563 | |
Jon Mason | ed2888e | 2011-09-08 16:41:18 -0500 | [diff] [blame] | 1564 | /* For Max performance, the MRRS must be set to the largest supported |
| 1565 | * value. However, it cannot be configured larger than the MPS the |
Jon Mason | 62f392e | 2011-10-14 14:56:14 -0500 | [diff] [blame] | 1566 | * device or the bus can support. This should already be properly |
| 1567 | * configured by a prior call to pcie_write_mps. |
Jon Mason | ed2888e | 2011-09-08 16:41:18 -0500 | [diff] [blame] | 1568 | */ |
Jon Mason | 62f392e | 2011-10-14 14:56:14 -0500 | [diff] [blame] | 1569 | mrrs = pcie_get_mps(dev); |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1570 | |
| 1571 | /* MRRS is a R/W register. Invalid values can be written, but a |
Jon Mason | ed2888e | 2011-09-08 16:41:18 -0500 | [diff] [blame] | 1572 | * subsequent read will verify if the value is acceptable or not. |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1573 | * If the MRRS value provided is not acceptable (e.g., too large), |
| 1574 | * shrink the value until it is acceptable to the HW. |
| 1575 | */ |
| 1576 | while (mrrs != pcie_get_readrq(dev) && mrrs >= 128) { |
| 1577 | rc = pcie_set_readrq(dev, mrrs); |
Jon Mason | 62f392e | 2011-10-14 14:56:14 -0500 | [diff] [blame] | 1578 | if (!rc) |
| 1579 | break; |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1580 | |
Jon Mason | 62f392e | 2011-10-14 14:56:14 -0500 | [diff] [blame] | 1581 | dev_warn(&dev->dev, "Failed attempting to set the MRRS\n"); |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1582 | mrrs /= 2; |
| 1583 | } |
Jon Mason | 62f392e | 2011-10-14 14:56:14 -0500 | [diff] [blame] | 1584 | |
| 1585 | if (mrrs < 128) |
| 1586 | dev_err(&dev->dev, "MRRS was unable to be configured with a " |
| 1587 | "safe value. If problems are experienced, try running " |
| 1588 | "with pci=pcie_bus_safe.\n"); |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1589 | } |
| 1590 | |
Yijing Wang | 5895af7 | 2013-08-26 16:33:06 +0800 | [diff] [blame] | 1591 | static void pcie_bus_detect_mps(struct pci_dev *dev) |
| 1592 | { |
| 1593 | struct pci_dev *bridge = dev->bus->self; |
| 1594 | int mps, p_mps; |
| 1595 | |
| 1596 | if (!bridge) |
| 1597 | return; |
| 1598 | |
| 1599 | mps = pcie_get_mps(dev); |
| 1600 | p_mps = pcie_get_mps(bridge); |
| 1601 | |
| 1602 | if (mps != p_mps) |
| 1603 | dev_warn(&dev->dev, "Max Payload Size %d, but upstream %s set to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n", |
| 1604 | mps, pci_name(bridge), p_mps); |
| 1605 | } |
| 1606 | |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1607 | static int pcie_bus_configure_set(struct pci_dev *dev, void *data) |
| 1608 | { |
Jon Mason | a513a99 | 2011-10-14 14:56:16 -0500 | [diff] [blame] | 1609 | int mps, orig_mps; |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1610 | |
| 1611 | if (!pci_is_pcie(dev)) |
| 1612 | return 0; |
| 1613 | |
Yijing Wang | 5895af7 | 2013-08-26 16:33:06 +0800 | [diff] [blame] | 1614 | if (pcie_bus_config == PCIE_BUS_TUNE_OFF) { |
| 1615 | pcie_bus_detect_mps(dev); |
| 1616 | return 0; |
| 1617 | } |
| 1618 | |
Jon Mason | a513a99 | 2011-10-14 14:56:16 -0500 | [diff] [blame] | 1619 | mps = 128 << *(u8 *)data; |
| 1620 | orig_mps = pcie_get_mps(dev); |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1621 | |
| 1622 | pcie_write_mps(dev, mps); |
Jon Mason | 62f392e | 2011-10-14 14:56:14 -0500 | [diff] [blame] | 1623 | pcie_write_mrrs(dev); |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1624 | |
Bjorn Helgaas | 2c25e34 | 2013-08-22 11:24:43 +0800 | [diff] [blame] | 1625 | dev_info(&dev->dev, "Max Payload Size set to %4d/%4d (was %4d), " |
Jon Mason | a513a99 | 2011-10-14 14:56:16 -0500 | [diff] [blame] | 1626 | "Max Read Rq %4d\n", pcie_get_mps(dev), 128 << dev->pcie_mpss, |
| 1627 | orig_mps, pcie_get_readrq(dev)); |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1628 | |
| 1629 | return 0; |
| 1630 | } |
| 1631 | |
Jon Mason | a513a99 | 2011-10-14 14:56:16 -0500 | [diff] [blame] | 1632 | /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down, |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1633 | * parents then children fashion. If this changes, then this code will not |
| 1634 | * work as designed. |
| 1635 | */ |
Bjorn Helgaas | a58674f | 2013-08-22 11:24:44 +0800 | [diff] [blame] | 1636 | void pcie_bus_configure_settings(struct pci_bus *bus) |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1637 | { |
Jon Mason | 5f39e67 | 2011-10-03 09:50:20 -0500 | [diff] [blame] | 1638 | u8 smpss; |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1639 | |
Bjorn Helgaas | a58674f | 2013-08-22 11:24:44 +0800 | [diff] [blame] | 1640 | if (!bus->self) |
| 1641 | return; |
| 1642 | |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1643 | if (!pci_is_pcie(bus->self)) |
| 1644 | return; |
| 1645 | |
Jon Mason | 5f39e67 | 2011-10-03 09:50:20 -0500 | [diff] [blame] | 1646 | /* FIXME - Peer to peer DMA is possible, though the endpoint would need |
Jon Mason | 3315472 | 2013-08-26 16:33:05 +0800 | [diff] [blame] | 1647 | * to be aware of the MPS of the destination. To work around this, |
Jon Mason | 5f39e67 | 2011-10-03 09:50:20 -0500 | [diff] [blame] | 1648 | * simply force the MPS of the entire system to the smallest possible. |
| 1649 | */ |
| 1650 | if (pcie_bus_config == PCIE_BUS_PEER2PEER) |
| 1651 | smpss = 0; |
| 1652 | |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1653 | if (pcie_bus_config == PCIE_BUS_SAFE) { |
Bjorn Helgaas | a58674f | 2013-08-22 11:24:44 +0800 | [diff] [blame] | 1654 | smpss = bus->self->pcie_mpss; |
Jon Mason | 5f39e67 | 2011-10-03 09:50:20 -0500 | [diff] [blame] | 1655 | |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1656 | pcie_find_smpss(bus->self, &smpss); |
| 1657 | pci_walk_bus(bus, pcie_find_smpss, &smpss); |
| 1658 | } |
| 1659 | |
| 1660 | pcie_bus_configure_set(bus->self, &smpss); |
| 1661 | pci_walk_bus(bus, pcie_bus_configure_set, &smpss); |
| 1662 | } |
Jon Mason | debc3b7 | 2011-08-02 00:01:18 -0500 | [diff] [blame] | 1663 | EXPORT_SYMBOL_GPL(pcie_bus_configure_settings); |
Jon Mason | b03e749 | 2011-07-20 15:20:54 -0500 | [diff] [blame] | 1664 | |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 1665 | unsigned int pci_scan_child_bus(struct pci_bus *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | { |
Yinghai Lu | b918c62 | 2012-05-17 18:51:11 -0700 | [diff] [blame] | 1667 | unsigned int devfn, pass, max = bus->busn_res.start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | struct pci_dev *dev; |
| 1669 | |
Bjorn Helgaas | 0207c35 | 2009-11-04 10:32:52 -0700 | [diff] [blame] | 1670 | dev_dbg(&bus->dev, "scanning bus\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | |
| 1672 | /* Go find them, Rover! */ |
| 1673 | for (devfn = 0; devfn < 0x100; devfn += 8) |
| 1674 | pci_scan_slot(bus, devfn); |
| 1675 | |
Yu Zhao | a28724b | 2009-03-20 11:25:13 +0800 | [diff] [blame] | 1676 | /* Reserve buses for SR-IOV capability. */ |
| 1677 | max += pci_iov_bus_range(bus); |
| 1678 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | /* |
| 1680 | * After performing arch-dependent fixup of the bus, look behind |
| 1681 | * all PCI-to-PCI bridges on this bus. |
| 1682 | */ |
Alex Chiang | 74710de | 2009-03-20 14:56:10 -0600 | [diff] [blame] | 1683 | if (!bus->is_added) { |
Bjorn Helgaas | 0207c35 | 2009-11-04 10:32:52 -0700 | [diff] [blame] | 1684 | dev_dbg(&bus->dev, "fixups for bus\n"); |
Alex Chiang | 74710de | 2009-03-20 14:56:10 -0600 | [diff] [blame] | 1685 | pcibios_fixup_bus(bus); |
Jiang Liu | 981cf9e | 2013-04-12 05:44:16 +0000 | [diff] [blame] | 1686 | bus->is_added = 1; |
Alex Chiang | 74710de | 2009-03-20 14:56:10 -0600 | [diff] [blame] | 1687 | } |
| 1688 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | for (pass=0; pass < 2; pass++) |
| 1690 | list_for_each_entry(dev, &bus->devices, bus_list) { |
| 1691 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || |
| 1692 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) |
| 1693 | max = pci_scan_bridge(bus, dev, max, pass); |
| 1694 | } |
| 1695 | |
| 1696 | /* |
| 1697 | * We've scanned the bus and so we know all about what's on |
| 1698 | * the other side of any bridges that may be on this bus plus |
| 1699 | * any devices. |
| 1700 | * |
| 1701 | * Return how far we've got finding sub-buses. |
| 1702 | */ |
Bjorn Helgaas | 0207c35 | 2009-11-04 10:32:52 -0700 | [diff] [blame] | 1703 | dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | return max; |
| 1705 | } |
| 1706 | |
Rafael J. Wysocki | 6c0cc95 | 2013-01-09 22:33:37 +0100 | [diff] [blame] | 1707 | /** |
| 1708 | * pcibios_root_bridge_prepare - Platform-specific host bridge setup. |
| 1709 | * @bridge: Host bridge to set up. |
| 1710 | * |
| 1711 | * Default empty implementation. Replace with an architecture-specific setup |
| 1712 | * routine, if necessary. |
| 1713 | */ |
| 1714 | int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) |
| 1715 | { |
| 1716 | return 0; |
| 1717 | } |
| 1718 | |
Jiang Liu | 10a9574 | 2013-04-12 05:44:20 +0000 | [diff] [blame] | 1719 | void __weak pcibios_add_bus(struct pci_bus *bus) |
| 1720 | { |
| 1721 | } |
| 1722 | |
| 1723 | void __weak pcibios_remove_bus(struct pci_bus *bus) |
| 1724 | { |
| 1725 | } |
| 1726 | |
Bjorn Helgaas | 166c637 | 2011-10-28 16:25:45 -0600 | [diff] [blame] | 1727 | struct pci_bus *pci_create_root_bus(struct device *parent, int bus, |
| 1728 | struct pci_ops *ops, void *sysdata, struct list_head *resources) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | { |
Bjorn Helgaas | 0efd5aa | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 1730 | int error; |
Bjorn Helgaas | 5a21d70 | 2012-02-23 20:18:59 -0700 | [diff] [blame] | 1731 | struct pci_host_bridge *bridge; |
Bjorn Helgaas | 0207c35 | 2009-11-04 10:32:52 -0700 | [diff] [blame] | 1732 | struct pci_bus *b, *b2; |
Bjorn Helgaas | 0efd5aa | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 1733 | struct pci_host_bridge_window *window, *n; |
Bjorn Helgaas | a9d9f52 | 2011-10-28 16:25:40 -0600 | [diff] [blame] | 1734 | struct resource *res; |
Bjorn Helgaas | 0efd5aa | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 1735 | resource_size_t offset; |
| 1736 | char bus_addr[64]; |
| 1737 | char *fmt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | |
Bjorn Helgaas | 5a21d70 | 2012-02-23 20:18:59 -0700 | [diff] [blame] | 1739 | b = pci_alloc_bus(); |
| 1740 | if (!b) |
Yinghai Lu | 7b54366 | 2012-04-02 18:31:53 -0700 | [diff] [blame] | 1741 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | |
| 1743 | b->sysdata = sysdata; |
| 1744 | b->ops = ops; |
Yinghai Lu | 4f53509 | 2013-01-21 13:20:52 -0800 | [diff] [blame] | 1745 | b->number = b->busn_res.start = bus; |
Bjorn Helgaas | 0207c35 | 2009-11-04 10:32:52 -0700 | [diff] [blame] | 1746 | b2 = pci_find_bus(pci_domain_nr(b), bus); |
| 1747 | if (b2) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | /* If we already got to this bus through a different bridge, ignore it */ |
Bjorn Helgaas | 0207c35 | 2009-11-04 10:32:52 -0700 | [diff] [blame] | 1749 | dev_dbg(&b2->dev, "bus already known\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1750 | goto err_out; |
| 1751 | } |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 1752 | |
Yinghai Lu | 7b54366 | 2012-04-02 18:31:53 -0700 | [diff] [blame] | 1753 | bridge = pci_alloc_host_bridge(b); |
| 1754 | if (!bridge) |
| 1755 | goto err_out; |
| 1756 | |
| 1757 | bridge->dev.parent = parent; |
Jiang Liu | 70efde2 | 2013-06-07 16:16:51 -0600 | [diff] [blame] | 1758 | bridge->dev.release = pci_release_host_bridge_dev; |
Yinghai Lu | 7b54366 | 2012-04-02 18:31:53 -0700 | [diff] [blame] | 1759 | dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus); |
Rafael J. Wysocki | 6c0cc95 | 2013-01-09 22:33:37 +0100 | [diff] [blame] | 1760 | error = pcibios_root_bridge_prepare(bridge); |
Jiang Liu | 343df77 | 2013-06-07 01:10:08 +0800 | [diff] [blame] | 1761 | if (error) { |
| 1762 | kfree(bridge); |
| 1763 | goto err_out; |
| 1764 | } |
Rafael J. Wysocki | 6c0cc95 | 2013-01-09 22:33:37 +0100 | [diff] [blame] | 1765 | |
Yinghai Lu | 7b54366 | 2012-04-02 18:31:53 -0700 | [diff] [blame] | 1766 | error = device_register(&bridge->dev); |
Jiang Liu | 343df77 | 2013-06-07 01:10:08 +0800 | [diff] [blame] | 1767 | if (error) { |
| 1768 | put_device(&bridge->dev); |
| 1769 | goto err_out; |
| 1770 | } |
Yinghai Lu | 7b54366 | 2012-04-02 18:31:53 -0700 | [diff] [blame] | 1771 | b->bridge = get_device(&bridge->dev); |
Rafael J. Wysocki | a1e4d72 | 2010-02-08 19:16:33 +0100 | [diff] [blame] | 1772 | device_enable_async_suspend(b->bridge); |
Benjamin Herrenschmidt | 98d9f30c8 | 2011-04-11 11:37:07 +1000 | [diff] [blame] | 1773 | pci_set_bus_of_node(b); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1774 | |
Yinghai Lu | 0d358f2 | 2008-02-19 03:20:41 -0800 | [diff] [blame] | 1775 | if (!parent) |
| 1776 | set_dev_node(b->bridge, pcibus_to_node(b)); |
| 1777 | |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 1778 | b->dev.class = &pcibus_class; |
| 1779 | b->dev.parent = b->bridge; |
Kay Sievers | 1a92713 | 2008-10-30 02:17:49 +0100 | [diff] [blame] | 1780 | dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus); |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 1781 | error = device_register(&b->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | if (error) |
| 1783 | goto class_dev_reg_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1784 | |
Jiang Liu | 10a9574 | 2013-04-12 05:44:20 +0000 | [diff] [blame] | 1785 | pcibios_add_bus(b); |
| 1786 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1787 | /* Create legacy_io and legacy_mem files for this bus */ |
| 1788 | pci_create_legacy_files(b); |
| 1789 | |
Bjorn Helgaas | a9d9f52 | 2011-10-28 16:25:40 -0600 | [diff] [blame] | 1790 | if (parent) |
| 1791 | dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev)); |
| 1792 | else |
| 1793 | printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev)); |
| 1794 | |
Bjorn Helgaas | 0efd5aa | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 1795 | /* Add initial resources to the bus */ |
| 1796 | list_for_each_entry_safe(window, n, resources, list) { |
| 1797 | list_move_tail(&window->list, &bridge->windows); |
| 1798 | res = window->res; |
| 1799 | offset = window->offset; |
Yinghai Lu | f848ffb | 2012-05-17 18:51:12 -0700 | [diff] [blame] | 1800 | if (res->flags & IORESOURCE_BUS) |
| 1801 | pci_bus_insert_busn_res(b, bus, res->end); |
| 1802 | else |
| 1803 | pci_bus_add_resource(b, res, 0); |
Bjorn Helgaas | 0efd5aa | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 1804 | if (offset) { |
| 1805 | if (resource_type(res) == IORESOURCE_IO) |
| 1806 | fmt = " (bus address [%#06llx-%#06llx])"; |
| 1807 | else |
| 1808 | fmt = " (bus address [%#010llx-%#010llx])"; |
| 1809 | snprintf(bus_addr, sizeof(bus_addr), fmt, |
| 1810 | (unsigned long long) (res->start - offset), |
| 1811 | (unsigned long long) (res->end - offset)); |
| 1812 | } else |
| 1813 | bus_addr[0] = '\0'; |
| 1814 | dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr); |
Bjorn Helgaas | a9d9f52 | 2011-10-28 16:25:40 -0600 | [diff] [blame] | 1815 | } |
| 1816 | |
Bjorn Helgaas | a5390aa | 2012-02-23 20:18:59 -0700 | [diff] [blame] | 1817 | down_write(&pci_bus_sem); |
| 1818 | list_add_tail(&b->node, &pci_root_buses); |
| 1819 | up_write(&pci_bus_sem); |
| 1820 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1821 | return b; |
| 1822 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | class_dev_reg_err: |
Yinghai Lu | 7b54366 | 2012-04-02 18:31:53 -0700 | [diff] [blame] | 1824 | put_device(&bridge->dev); |
| 1825 | device_unregister(&bridge->dev); |
Yinghai Lu | 7b54366 | 2012-04-02 18:31:53 -0700 | [diff] [blame] | 1826 | err_out: |
| 1827 | kfree(b); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1828 | return NULL; |
| 1829 | } |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1830 | |
Yinghai Lu | 98a3583 | 2012-05-18 11:35:50 -0600 | [diff] [blame] | 1831 | int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max) |
| 1832 | { |
| 1833 | struct resource *res = &b->busn_res; |
| 1834 | struct resource *parent_res, *conflict; |
| 1835 | |
| 1836 | res->start = bus; |
| 1837 | res->end = bus_max; |
| 1838 | res->flags = IORESOURCE_BUS; |
| 1839 | |
| 1840 | if (!pci_is_root_bus(b)) |
| 1841 | parent_res = &b->parent->busn_res; |
| 1842 | else { |
| 1843 | parent_res = get_pci_domain_busn_res(pci_domain_nr(b)); |
| 1844 | res->flags |= IORESOURCE_PCI_FIXED; |
| 1845 | } |
| 1846 | |
| 1847 | conflict = insert_resource_conflict(parent_res, res); |
| 1848 | |
| 1849 | if (conflict) |
| 1850 | dev_printk(KERN_DEBUG, &b->dev, |
| 1851 | "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n", |
| 1852 | res, pci_is_root_bus(b) ? "domain " : "", |
| 1853 | parent_res, conflict->name, conflict); |
Yinghai Lu | 98a3583 | 2012-05-18 11:35:50 -0600 | [diff] [blame] | 1854 | |
| 1855 | return conflict == NULL; |
| 1856 | } |
| 1857 | |
| 1858 | int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max) |
| 1859 | { |
| 1860 | struct resource *res = &b->busn_res; |
| 1861 | struct resource old_res = *res; |
| 1862 | resource_size_t size; |
| 1863 | int ret; |
| 1864 | |
| 1865 | if (res->start > bus_max) |
| 1866 | return -EINVAL; |
| 1867 | |
| 1868 | size = bus_max - res->start + 1; |
| 1869 | ret = adjust_resource(res, res->start, size); |
| 1870 | dev_printk(KERN_DEBUG, &b->dev, |
| 1871 | "busn_res: %pR end %s updated to %02x\n", |
| 1872 | &old_res, ret ? "can not be" : "is", bus_max); |
| 1873 | |
| 1874 | if (!ret && !res->parent) |
| 1875 | pci_bus_insert_busn_res(b, res->start, res->end); |
| 1876 | |
| 1877 | return ret; |
| 1878 | } |
| 1879 | |
| 1880 | void pci_bus_release_busn_res(struct pci_bus *b) |
| 1881 | { |
| 1882 | struct resource *res = &b->busn_res; |
| 1883 | int ret; |
| 1884 | |
| 1885 | if (!res->flags || !res->parent) |
| 1886 | return; |
| 1887 | |
| 1888 | ret = release_resource(res); |
| 1889 | dev_printk(KERN_DEBUG, &b->dev, |
| 1890 | "busn_res: %pR %s released\n", |
| 1891 | res, ret ? "can not be" : "is"); |
| 1892 | } |
| 1893 | |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 1894 | struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, |
Bjorn Helgaas | a2ebb82 | 2011-10-28 16:25:50 -0600 | [diff] [blame] | 1895 | struct pci_ops *ops, void *sysdata, struct list_head *resources) |
| 1896 | { |
Yinghai Lu | 4d99f52 | 2012-05-17 18:51:12 -0700 | [diff] [blame] | 1897 | struct pci_host_bridge_window *window; |
| 1898 | bool found = false; |
Bjorn Helgaas | a2ebb82 | 2011-10-28 16:25:50 -0600 | [diff] [blame] | 1899 | struct pci_bus *b; |
Yinghai Lu | 4d99f52 | 2012-05-17 18:51:12 -0700 | [diff] [blame] | 1900 | int max; |
| 1901 | |
| 1902 | list_for_each_entry(window, resources, list) |
| 1903 | if (window->res->flags & IORESOURCE_BUS) { |
| 1904 | found = true; |
| 1905 | break; |
| 1906 | } |
Bjorn Helgaas | a2ebb82 | 2011-10-28 16:25:50 -0600 | [diff] [blame] | 1907 | |
| 1908 | b = pci_create_root_bus(parent, bus, ops, sysdata, resources); |
| 1909 | if (!b) |
| 1910 | return NULL; |
| 1911 | |
Yinghai Lu | 4d99f52 | 2012-05-17 18:51:12 -0700 | [diff] [blame] | 1912 | if (!found) { |
| 1913 | dev_info(&b->dev, |
| 1914 | "No busn resource found for root bus, will use [bus %02x-ff]\n", |
| 1915 | bus); |
| 1916 | pci_bus_insert_busn_res(b, bus, 255); |
| 1917 | } |
| 1918 | |
| 1919 | max = pci_scan_child_bus(b); |
| 1920 | |
| 1921 | if (!found) |
| 1922 | pci_bus_update_busn_res_end(b, max); |
| 1923 | |
Bjorn Helgaas | a2ebb82 | 2011-10-28 16:25:50 -0600 | [diff] [blame] | 1924 | pci_bus_add_devices(b); |
| 1925 | return b; |
| 1926 | } |
| 1927 | EXPORT_SYMBOL(pci_scan_root_bus); |
| 1928 | |
Bjorn Helgaas | 7e00fe2 | 2011-10-28 16:26:05 -0600 | [diff] [blame] | 1929 | /* Deprecated; use pci_scan_root_bus() instead */ |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 1930 | struct pci_bus *pci_scan_bus_parented(struct device *parent, |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1931 | int bus, struct pci_ops *ops, void *sysdata) |
| 1932 | { |
Bjorn Helgaas | 1e39ae9 | 2011-10-28 16:26:00 -0600 | [diff] [blame] | 1933 | LIST_HEAD(resources); |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1934 | struct pci_bus *b; |
| 1935 | |
Bjorn Helgaas | 1e39ae9 | 2011-10-28 16:26:00 -0600 | [diff] [blame] | 1936 | pci_add_resource(&resources, &ioport_resource); |
| 1937 | pci_add_resource(&resources, &iomem_resource); |
Yinghai Lu | 857c3b6 | 2012-05-17 18:51:12 -0700 | [diff] [blame] | 1938 | pci_add_resource(&resources, &busn_resource); |
Bjorn Helgaas | 1e39ae9 | 2011-10-28 16:26:00 -0600 | [diff] [blame] | 1939 | b = pci_create_root_bus(parent, bus, ops, sysdata, &resources); |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1940 | if (b) |
Yinghai Lu | 857c3b6 | 2012-05-17 18:51:12 -0700 | [diff] [blame] | 1941 | pci_scan_child_bus(b); |
Bjorn Helgaas | 1e39ae9 | 2011-10-28 16:26:00 -0600 | [diff] [blame] | 1942 | else |
| 1943 | pci_free_resource_list(&resources); |
Paul Mackerras | cdb9b9f | 2005-09-06 09:31:03 +1000 | [diff] [blame] | 1944 | return b; |
| 1945 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1946 | EXPORT_SYMBOL(pci_scan_bus_parented); |
| 1947 | |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 1948 | struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, |
Bjorn Helgaas | de4b2f7 | 2011-10-28 16:25:55 -0600 | [diff] [blame] | 1949 | void *sysdata) |
| 1950 | { |
| 1951 | LIST_HEAD(resources); |
| 1952 | struct pci_bus *b; |
| 1953 | |
| 1954 | pci_add_resource(&resources, &ioport_resource); |
| 1955 | pci_add_resource(&resources, &iomem_resource); |
Yinghai Lu | 857c3b6 | 2012-05-17 18:51:12 -0700 | [diff] [blame] | 1956 | pci_add_resource(&resources, &busn_resource); |
Bjorn Helgaas | de4b2f7 | 2011-10-28 16:25:55 -0600 | [diff] [blame] | 1957 | b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources); |
| 1958 | if (b) { |
Yinghai Lu | 857c3b6 | 2012-05-17 18:51:12 -0700 | [diff] [blame] | 1959 | pci_scan_child_bus(b); |
Bjorn Helgaas | de4b2f7 | 2011-10-28 16:25:55 -0600 | [diff] [blame] | 1960 | pci_bus_add_devices(b); |
| 1961 | } else { |
| 1962 | pci_free_resource_list(&resources); |
| 1963 | } |
| 1964 | return b; |
| 1965 | } |
| 1966 | EXPORT_SYMBOL(pci_scan_bus); |
| 1967 | |
Alex Chiang | 3ed4fd9 | 2009-03-20 14:56:25 -0600 | [diff] [blame] | 1968 | /** |
Yinghai Lu | 2f32052 | 2012-01-21 02:08:22 -0800 | [diff] [blame] | 1969 | * pci_rescan_bus_bridge_resize - scan a PCI bus for devices. |
| 1970 | * @bridge: PCI bridge for the bus to scan |
| 1971 | * |
| 1972 | * Scan a PCI bus and child buses for new devices, add them, |
| 1973 | * and enable them, resizing bridge mmio/io resource if necessary |
| 1974 | * and possible. The caller must ensure the child devices are already |
| 1975 | * removed for resizing to occur. |
| 1976 | * |
| 1977 | * Returns the max number of subordinate bus discovered. |
| 1978 | */ |
| 1979 | unsigned int __ref pci_rescan_bus_bridge_resize(struct pci_dev *bridge) |
| 1980 | { |
| 1981 | unsigned int max; |
| 1982 | struct pci_bus *bus = bridge->subordinate; |
| 1983 | |
| 1984 | max = pci_scan_child_bus(bus); |
| 1985 | |
| 1986 | pci_assign_unassigned_bridge_resources(bridge); |
| 1987 | |
| 1988 | pci_bus_add_devices(bus); |
| 1989 | |
| 1990 | return max; |
| 1991 | } |
| 1992 | |
Yinghai Lu | a5213a3 | 2012-10-30 14:31:21 -0600 | [diff] [blame] | 1993 | /** |
| 1994 | * pci_rescan_bus - scan a PCI bus for devices. |
| 1995 | * @bus: PCI bus to scan |
| 1996 | * |
| 1997 | * Scan a PCI bus and child buses for new devices, adds them, |
| 1998 | * and enables them. |
| 1999 | * |
| 2000 | * Returns the max number of subordinate bus discovered. |
| 2001 | */ |
| 2002 | unsigned int __ref pci_rescan_bus(struct pci_bus *bus) |
| 2003 | { |
| 2004 | unsigned int max; |
| 2005 | |
| 2006 | max = pci_scan_child_bus(bus); |
| 2007 | pci_assign_unassigned_bus_resources(bus); |
| 2008 | pci_bus_add_devices(bus); |
| 2009 | |
| 2010 | return max; |
| 2011 | } |
| 2012 | EXPORT_SYMBOL_GPL(pci_rescan_bus); |
| 2013 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | EXPORT_SYMBOL(pci_add_new_bus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | EXPORT_SYMBOL(pci_scan_slot); |
| 2016 | EXPORT_SYMBOL(pci_scan_bridge); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2017 | EXPORT_SYMBOL_GPL(pci_scan_child_bus); |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 2018 | |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 2019 | static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b) |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 2020 | { |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 2021 | const struct pci_dev *a = to_pci_dev(d_a); |
| 2022 | const struct pci_dev *b = to_pci_dev(d_b); |
| 2023 | |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 2024 | if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1; |
| 2025 | else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1; |
| 2026 | |
| 2027 | if (a->bus->number < b->bus->number) return -1; |
| 2028 | else if (a->bus->number > b->bus->number) return 1; |
| 2029 | |
| 2030 | if (a->devfn < b->devfn) return -1; |
| 2031 | else if (a->devfn > b->devfn) return 1; |
| 2032 | |
| 2033 | return 0; |
| 2034 | } |
| 2035 | |
Greg Kroah-Hartman | 5ff580c | 2008-02-14 14:56:56 -0800 | [diff] [blame] | 2036 | void __init pci_sort_breadthfirst(void) |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 2037 | { |
Greg Kroah-Hartman | 99178b0 | 2008-08-26 11:00:57 -0500 | [diff] [blame] | 2038 | bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp); |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 2039 | } |