{"id":995,"date":"2023-11-20T20:32:26","date_gmt":"2023-11-20T11:32:26","guid":{"rendered":"https:\/\/pg-mana.net\/blog\/?p=995"},"modified":"2024-09-09T17:28:17","modified_gmt":"2024-09-09T08:28:17","slug":"pci_translation_offset","status":"publish","type":"post","link":"https:\/\/pg-mana.net\/blog\/pci_translation_offset\/","title":{"rendered":"PCI BAR\u306e\u5024\u3068ACPI\u306e_CRS\u95a2\u6570"},"content":{"rendered":"\n

\u3053\u306e\u6295\u7a3f\u306f\u3001Kernel\/VM\u63a2\u691c\u968a@\u5317\u9678 Part 6<\/a>\u3067\u767a\u8868\u3092\u884c\u3063\u305f\u300cAArch64 ThinHypervisor\u958b\u767a\u8a18\u9332\u300d\u306e\u300cPCI Base Address Register\u306f\u7d76\u5bfe\u30a2\u30c9\u30ec\u30b9\u3058\u3083\u7121\u304b\u3063\u305f\u8a71\u300d\u3092\u8a73\u3057\u304f\u8aac\u660e\u3057\u305f\u3082\u306e\u3067\u3059\u3002<\/p>\n\n\n\n

\n\n\n\n

PCI\u306e\u5404\u30c7\u30d0\u30a4\u30b9\u306b\u306f\u3001PCI Configuration Space\u3068\u3044\u3046\u3082\u306e\u304c\u3042\u3063\u3066\u3001\u305d\u3053\u306b\u306fBase Address Register(BAR)\u304c0~5\u307e\u30676\u3064\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

PCI\u30c7\u30d0\u30a4\u30b9\u3092\u64cd\u4f5c\u3059\u308b\u305f\u3081\u306b\u306f\u3001BAR\u306b\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u30a2\u30c9\u30ec\u30b9\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u3001\u6700\u8fd1\u306e\u30c7\u30d0\u30a4\u30b9\u306f\u6b86\u3069MMIO(Memory Mapped I\/O)\u3068\u306a\u3063\u3066\u3044\u3066\u3001\u30e1\u30e2\u30ea\u30a2\u30c9\u30ec\u30b9\u304c\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002
\u6700\u8fd1\u3067\u306f\u300164bit Address\u304c\u3088\u307b\u3069\u3067BAR 0\/1\u3092\u7528\u3044\u3066BAR0\u306b\u4e0b\u4f4d32bit\u3001BAR1\u306b\u4e0a\u4f4d32bit\u304c\u8a18\u8ff0\u3055\u308c\u3066\u3044\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

\u57fa\u672c\u7684\u306bBAR\u306b\u66f8\u304b\u308c\u3066\u3044\u308b\u30a2\u30c9\u30ec\u30b9\u304c\u305d\u306e\u307e\u307eMMIO\u306e\u30a2\u30c9\u30ec\u30b9\u306b\u306a\u308b\u3068\u601d\u3046\u306e\u3067\u3059\u304c\u3001\u307e\u308c\u306b\u3053\u308c\u304c\u76f8\u5bfe\u30a2\u30c9\u30ec\u30b9\u3067\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002
\u4eca\u56de\u306f\u3001\u305d\u306e\u30b1\u30fc\u30b9\u306b\u3064\u3044\u3066\u8ffd\u3063\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

\u80cc\u666f<\/h2>\n\n\n\n

\u30cf\u30a4\u30d1\u30fc\u30d0\u30a4\u30b6\u3067\u5b9f\u969b\u306ePCI Bridge\u306e\u4e0b\u306b\u5bc4\u751f\u3059\u308b\u5f62\u3067VirtIO Network Device\u3092\u751f\u3084\u3059\u5b9f\u88c5\u3092\u3057\u3066\u3044\u307e\u3057\u305f\u3002
\u5177\u4f53\u7684\u306b\u306f\u3001PCI Configuration Space\u3092\u8d70\u67fb\u3057\u3066\u3044\u304d\u30c7\u30d0\u30a4\u30b9\u304c\u306a\u3044Bus:Device.Function\u3092\u53d6\u5f97\u3057\u3001\u5bfe\u5fdc\u3059\u308bPCI Configuration Space\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u30c8\u30e9\u30c3\u30d7\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u30cf\u30a4\u30d1\u30fc\u30d0\u30a4\u30b6\u3067VirtIO Network\u7528\u306ePCI Configuration\u3092\u63d0\u4f9b\u3059\u308b\u3001\u3068\u3044\u3046\u5b9f\u88c5\u3092\u3057\u3066\u3044\u307e\u3057\u305f\u3002
VirtIO Network\u304c\u5b9f\u969b\u306b\u52d5\u4f5c\u3059\u308b\u305f\u3081\u306b\u306f\u3001BAR\u306b\u8a18\u8f09\u3055\u308c\u308bMMIO\u3067VirtQueue\u306e\u51e6\u7406\u306a\u3069\u3092\u3057\u306a\u3044\u3068\u3044\u3051\u306a\u3044\u306e\u3067\u3059\u304c\u3001Linux\u306f\u8d77\u52d5\u6642\u306bBase Address\u3092\u5909\u66f4\u3057\u3066\u6574\u7406\u3057\u307e\u3059\u3002\u3053\u306e\u305f\u3081BAR\u306b\u65b0\u305f\u306a\u5024\u304c\u66f8\u304d\u8fbc\u307e\u308c\u305f\u5834\u5408\u306b\u306f\u3053\u306e\u5024\u3092\u3082\u3068\u306b\u30c8\u30e9\u30c3\u30d7\u3059\u308b\u30e1\u30e2\u30ea\u30a2\u30c9\u30ec\u30b9\u3092\u5909\u66f4\u3057\u306a\u3044\u3068\u3044\u3051\u307e\u305b\u3093\u3002
\u4eca\u56de\u306f64bit\u30a2\u30c9\u30ec\u30b9\u306a\u306e\u3067BAR0\/BAR1\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u306e\u3067\u3059\u304c\u3001\u304a\u304b\u3057\u306a\u6319\u52d5\u306b\u60a9\u307e\u3055\u308c\u307e\u3057\u305f\u3002
\u4ee5\u4e0b\u306f\u3001Linux\u3068\u30cf\u30a4\u30d1\u30fc\u30d0\u30a4\u30b6\u306e\u8d77\u52d5\u6642\u306e\u30b7\u30ea\u30a2\u30eb\u51fa\u529b\u306a\u306e\u3067\u3059\u304c\u3001Linux\u304c\u5272\u308a\u5f53\u3066\u305f\u3068\u4e3b\u5f35\u3059\u308b\u30a2\u30c9\u30ec\u30b9\u3068\u5b9f\u969b\u306bPCI Configuration Space\u306eBAR\u306b\u66f8\u304d\u8fbc\u307e\u308c\u308b\u5024\u304c\u7570\u306a\u308b\u306e\u3067\u3059\u3002
(Hypervisor: <\/code>\u3068\u66f8\u304b\u308c\u3066\u3044\u308b\u884c\u306f\u30cf\u30a4\u30d1\u30fc\u30d0\u30a4\u30b6\u304c\u51fa\u529b\u3057\u305f\u884c\u3067\u3059\u3002)<\/p>\n\n\n\n

[    1.454562] pci 0000:00:01.0: BAR 0: assigned [mem 0xe000200000-0xe000200fff 64bit]\nHypervisor: BAR0: 0x200004\nHypervisor: BAR1: 0x0\nHypervisor: New Base Address: 0x200000<\/code><\/pre>\n\n\n\n
Linux\u306f 0xe000200000<\/code> \u3092\u30a2\u30b5\u30a4\u30f3\u3057\u305f\u3068\u8868\u793a\u3057\u3066\u3044\u308b\u306e\u306b\u3001\u5b9f\u969b\u306bBAR\u306b\u66f8\u304d\u8fbc\u307e\u308c\u308b\u30a2\u30c9\u30ec\u30b9\u306f\u3001 0x200000<\/code> \u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002(BAR0\u306e\u4e0b\u4f4d3bit\u306f\u30d5\u30e9\u30b0\u30670x04\u306f64bit BAR\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002)
\u3053\u306e\u305f\u3081\u3001\u30cf\u30a4\u30d1\u30fc\u30d0\u30a4\u30b6\u306f 0x200000<\/code> \u3092MMIO\u9818\u57df\u3068\u8a2d\u5b9a\u3057\u3066\u30a2\u30af\u30bb\u30b9\u3092\u30c8\u30e9\u30c3\u30d7\u3059\u308b\u306e\u306b\u5bfe\u3057\u3001Linux\u306f 0xe000200000<\/code> \u306b\u30a2\u30af\u30bb\u30b9\u3057\u306b\u884c\u304f\u306e\u3067\u30c7\u30d0\u30a4\u30b9\u306e\u5236\u5fa1\u304c\u3067\u304d\u305a\u3001\u8d77\u52d5\u306b\u5931\u6557\u3057\u307e\u3059\u3002
\u3069\u3046\u3057\u3066\u3053\u306e\u3088\u3046\u306a\u3053\u3068\u306b\u306a\u308b\u306e\u304b\u3001\u6319\u52d5\u3092\u8ffd\u3044\u307e\u3059\u3002

\u306a\u304a\u4eca\u56de\u4f7f\u7528\u3059\u308bLinux\u306fGNU\/Linux 5.4\u3067\u3059\u3002<\/p>\n\n\n\n
PCI Base Address\u306e\u5272\u308a\u5f53\u3066<\/h2>\n\n\n\n
PCI Base Address Register\u306bMMIO\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u66f8\u304d\u8fbc\u3093\u3067\u3044\u308b\u306e\u306f\u3001drivers\/pci\/setup-res.c<\/code> \u306e pci_std_update_resource<\/a> \u3067\u884c\u3063\u3066\u3044\u307e\u3059\u3002pci_std_update_resource\u306e\u4eca\u56de\u95a2\u4fc2\u3042\u308b\u90e8\u5206\u3092\u6982\u8981\u3092\u62bd\u51fa\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
static void pci_std_update_resource(struct pci_dev *dev, int resno)\n{\n\tstruct pci_bus_region region;\n\tu32 new;\n\tint reg;\n\tstruct resource *res = dev->resource + resno;\n\n\tpcibios_resource_to_bus(dev->bus, &region, res);\n\tnew = region.start;\n\tnew |= res->flags & ~PCI_BASE_ADDRESS_MEM_MASK;\n\n\treg = PCI_BASE_ADDRESS_0 + 4 * resno;\n\n\tpci_write_config_dword(dev, reg, new);\n\n\tif (res->flags & IORESOURCE_MEM_64) {\n\t\tnew = region.start >> 16 >> 16;\n\t\tpci_write_config_dword(dev, reg + 4, new);\n\t}\n}<\/code><\/pre>\n\n\n\n
\u3053\u306e\u95a2\u6570\u3067\u306f\u3001 \u914d\u5217\u3068\u306a\u3063\u3066\u3044\u308b dev->resource<\/code> \u306e resno<\/code> \u756a\u76ee\u306e\u30a8\u30f3\u30c8\u30ea\u3092\u53d6\u308a\u51fa\u3057\u3001\u3053\u308c\u3092  pcibios_resource_to_bus<\/code> \u306b\u4e0e\u3048\u3066\u3001\u8fd4\u3063\u3066\u304d\u305f region.start<\/code> \u3092BAR0\/1\u306b\u66f8\u304d\u8fbc\u3093\u3067\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\u6b21\u306b pcibios_resource_to_bus<\/a> \u3092\u898b\u3066\u307f\u307e\u3059\u3002<\/p>\n\n\n\n
void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,\n\t\t\t     struct resource *res)\n{\n\tstruct pci_host_bridge *bridge = pci_find_host_bridge(bus);\n\tstruct resource_entry *window;\n\tresource_size_t offset = 0;\n\n\tresource_list_for_each_entry(window, &bridge->windows) {\n\t\tif (resource_contains(window->res, res)) {\n\t\t\toffset = window->offset;\n\t\t\tbreak;\n\t\t}\n\t}\n\n\tregion->start = res->start - offset;\n\tregion->end = res->end - offset;\n}<\/code><\/pre>\n\n\n\n
region->start = res->start - offset;<\/code> \u304c\u4eca\u56de\u6ce8\u76ee\u3059\u3079\u304d\u70b9\u306a\u306e\u3067\u3059\u304c\u3001 offset<\/code> \u3068\u3044\u3046\u306e\u304c\u6c17\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u5024\u306f\u3001 bridge->windows<\/code> \u3092\u9806\u756a\u306b\u8abf\u3079\u3066\u3044\u304d\u3001 resource_contains(window->res, res)<\/code> \u304c\u771f\u3092\u8fd4\u3057\u305f\u969b\u306b\u3001 window->offset<\/code> \u306e\u5024\u304c\u30bb\u30c3\u30c8\u3055\u308c\u307e\u3059\u3002 resource_contains<\/a> \u306f\u3001 window->res->start <= res->start && window->res->end >= res->end<\/code> \u306e\u969b\u306b true<\/code> \u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u3055\u3066\u3001  window->offset<\/code> \u306f\u3069\u3053\u3067\u30bb\u30c3\u30c8\u3055\u308c\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002
\u8abf\u3079\u305f\u3068\u3053\u308d\u3001 acpi_dev_new_resource_entry<\/a> \u3067\u8a2d\u5b9a\u3055\u308c\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n\n\n\n
static acpi_status acpi_dev_new_resource_entry(struct resource_win *win,\n\t\t\t\t\t       struct res_proc_context *c)\n{\n\tstruct resource_entry *rentry;\n\n\trentry = resource_list_create_entry(NULL, 0);\n\tif (!rentry) {\n\t\tc->error = -ENOMEM;\n\t\treturn AE_NO_MEMORY;\n\t}\n\t*rentry->res = win->res;\n\trentry->offset = win->offset;\n\tresource_list_add_tail(rentry, c->list);\n\tc->count++;\n\treturn AE_OK;\n}<\/code><\/pre>\n\n\n\n
rentry->offset = win->offset;<\/code> \u304c\u305d\u308c\u3067\u3059\u3002\u3053\u306e\u95a2\u6570\u306f\u3001\u3059\u3050\u4e0b\u306e acpi_dev_process_resource<\/a> \u3067\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002 acpi_dev_process_resource<\/code> \u306e\u51e6\u7406\u6982\u8981\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n
static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,\n\t\t\t\t\t     void *context)\n{\n\tstruct res_proc_context *c = context;\n\tstruct resource_win win;\n\n\tmemset(&win, 0, sizeof(win));\n\n\tif (acpi_dev_resource_memory(ares, res)\n\t    || acpi_dev_resource_io(ares, res)\n\t    || acpi_dev_resource_address_space(ares, &win)\n\t    || acpi_dev_resource_ext_address_space(ares, &win))\n\t\treturn acpi_dev_new_resource_entry(&win, c);\n\n\treturn AE_OK;\n}<\/code><\/pre>\n\n\n\n
ares<\/code> \u3092\u5404\u95a2\u6570\u306b\u6e21\u3057\u3066\u30d1\u30fc\u30b9\u304c\u6210\u529f\u3057\u305f\u3089 acpi_dev_new_resource_entry<\/code> \u3092\u547c\u3073\u51fa\u3059\u3088\u3046\u3067\u3059\u3002
\u3053\u3053\u307e\u3067\u306e\u4e88\u60f3\u3067\u3001 win->offset<\/code> \u306b\u5024\u304c\u5165\u3063\u3066\u3044\u308b\u3060\u308d\u3046\u3068\u4e88\u60f3\u3057\u3066\u3044\u308b\u306e\u3067\u3001 acpi_dev_resource_address_space<\/code> \u304b acpi_dev_resource_ext_address_space<\/code> \u306e\u3069\u3061\u3089\u304b\u304c true<\/code> \u3092\u8fd4\u3059\u3060\u308d\u3046\u3068\u4e88\u60f3\u3057\u307e\u3059\u3002\u3068\u308a\u3042\u3048\u305a\u3001 acpi_dev_resource_address_space<\/a> \u3092\u898b\u3066\u307f\u307e\u3059\u3002<\/p>\n\n\n\n
bool acpi_dev_resource_address_space(struct acpi_resource *ares,\n\t\t\t\t     struct resource_win *win)\n{\n\tstruct acpi_resource_address64 addr;\n\n\twin->res.flags = 0;\n\tif (ACPI_FAILURE(acpi_resource_to_address64(ares, &addr)))\n\t\treturn false;\n\n\treturn acpi_decode_space(win, (struct acpi_resource_address *)&addr,\n\t\t\t\t &addr.address);\n}<\/code><\/pre>\n\n\n\n
win<\/code> \u3078\u306e\u5024\u306e\u683c\u7d0d\u306f acpi_decode_space<\/code> \u3067\u3084\u3063\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u3002 acpi_dev_resource_ext_address_space<\/code> \u3082 acpi_decode_space<\/code> \u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
acpi_decode_space<\/a> \u306e\u3046\u3061 win->offset<\/code> \u306b\u95a2\u308f\u308b\u90e8\u5206\u3092\u629c\u7c8b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
static bool acpi_decode_space(struct resource_win *win,\n\t\t\t      struct acpi_resource_address *addr,\n\t\t\t      struct acpi_address64_attribute *attr)\n{\n\t\/\/ ...\n\t\/*\n\t * For bridges that translate addresses across the bridge,\n\t * translation_offset is the offset that must be added to the\n\t * address on the secondary side to obtain the address on the\n\t * primary side. Non-bridge devices must list 0 for all Address\n\t * Translation offset bits.\n\t *\/\n\tif (addr->producer_consumer == ACPI_PRODUCER)\n\t\toffset = attr->translation_offset;\n\twin->offset = offset;\n\t\/\/ ...\n}<\/code><\/pre>\n\n\n\n
\u30b3\u30e1\u30f3\u30c8\u3067\u3001translate addresses\u306b\u3064\u3044\u3066\u66f8\u3044\u3066\u304a\u308a\u3001PCI\u30d6\u30ea\u30c3\u30b8\u3092\u8de8\u3050\u969b\u306b\u30a2\u30c9\u30ec\u30b9\u5909\u63db\u3092\u884c\u3046\u30d6\u30ea\u30c3\u30b8\u306f attr->translation_offset<\/code> \u304c\u30bb\u30c3\u30c8\u3055\u308c\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u3002
\u3053\u3053\u304b\u3089\u3001VirtIO Network Device\u304c\u5bc4\u751f\u3057\u3066\u3044\u305fPCI Host Bridge\u306f\u3053\u306e translation_offset<\/code> \u304c\u30bb\u30c3\u30c8\u3055\u308c\u3066\u3044\u308b\u3068\u4e88\u60f3\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u3055\u3066 acpi_dev_process_resource<\/code> \u306f\u3069\u3053\u304b\u3089\u547c\u3070\u308c\u3066\u3044\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002
\u547c\u3073\u51fa\u3057\u4e00\u89a7\u3092\u898b\u308b\u3068\u3001 __acpi_dev_get_resources<\/a> \u304b\u3089\u547c\u3073\u51fa\u3055\u308c\u3066\u3044\u308b\u6c17\u304c\u3057\u307e\u3059\u3002
\u3053\u306e\u95a2\u6570\u306f\u3001acpi_dev_get_resources<\/a> \u306e\u5185\u90e8\u95a2\u6570\u3067\u3059\u3002 __acpi_dev_get_resources<\/code> \u306e\u629c\u7c8b\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n
static int __acpi_dev_get_resources(struct acpi_device *adev,\n\t\t\t\t    struct list_head *list,\n\t\t\t\t    int (*preproc)(struct acpi_resource *, void *),\n\t\t\t\t    void *preproc_data, char *method)\n{\n\tstruct res_proc_context c;\n\tacpi_status status;\n\n\tc.list = list;\n\tc.preproc = preproc;\n\tc.preproc_data = preproc_data;\n\tc.count = 0;\n\tc.error = 0;\n\tstatus = acpi_walk_resources(adev->handle, method,\n\t\t\t\t     acpi_dev_process_resource, &c);\n\n\treturn c.count;\n}<\/code><\/pre>\n\n\n\n
acpi_dev_process_resource<\/code> \u306f acpi_walk_resources<\/code> \u306e\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3068\u3057\u3066\u6e21\u3055\u308c\u3066\u3044\u307e\u3059\u3002 acpi_walk_resources<\/a> \u306f ACPICA\u306e\u95a2\u6570\u3067\u3001\u30ea\u30bd\u30fc\u30b9\u306e\u30ea\u30b9\u30c8\u304b\u3089\u4e00\u3064\u305a\u3064\u30a8\u30f3\u30c8\u30ea\u3092\u53d6\u308a\u51fa\u3057\u3066\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
acpi_dev_get_resources<\/code> \u306e\u30b3\u30e1\u30f3\u30c8\u306b\u306f\u3001 “Evaluate the _CRS method for the given device node and process its output”\u3068\u3042\u308a\u3001\u6e21\u3055\u308c\u305f\u30c7\u30d0\u30a4\u30b9\u306e_CRS\u95a2\u6570\u3092\u8a55\u4fa1\u3059\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n\n\n\n
\u3053\u306e\u95a2\u6570\u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u305d\u3046\u306a\u306e\u306f\u3001 acpi_pci_probe_root_resources<\/a> \u3060\u3068\u4e88\u60f3\u3057\u307e\u3059\u3002
\u3053\u308c\u306b\u95a2\u3057\u3066\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304c\u3001 https:\/\/docs.kernel.org\/PCI\/acpi-info.html<\/a> \u306b\u5b58\u5728\u3057\u307e\u3059\u3002
\u3053\u3053\u304b\u3089\u5fc5\u8981\u306a\u90e8\u5206\u3092\u8aad\u307f\u53d6\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u307e\u305a\u3001”For example, there’s no standard hardware mechanism for enumerating PCI host bridges, so the ACPI namespace must describe each host bridge, the method for accessing PCI config space below it, the address space windows the host bridge forwards to PCI (using _CRS), and the routing of legacy INTx interrupts (using _PRT).”\u3068\u3044\u3046\u8a18\u8ff0\u306b\u6ce8\u76ee\u3057\u307e\u3059\u3002\u8981\u7d04\u3059\u308b\u3068\u3001\u300cPCI host bridge\u3092\u691c\u51fa\u3059\u308b\u6a19\u6e96\u7684\u306a\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30e1\u30ab\u30cb\u30ba\u30e0\u306f\u5b58\u5728\u305b\u305a\u3001ACPI\u540d\u524d\u7a7a\u9593\u306b\u304a\u3044\u3066_CRS\u3092\u8a55\u4fa1\u3059\u308b\u3053\u3068\u3067\u30a2\u30c9\u30ec\u30b9\u7a7a\u9593\u306e\u60c5\u5831\u3092\u53d6\u5f97\u3067\u304d\u308b\u3002\u300d\u3068\u3044\u3046\u611f\u3058\u3067\u3057\u3087\u3046\u304b\u3002
PCI Configuration Space\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u65b9\u6cd5\u3068\u3057\u3066\u3001ECAM\u304c\u3042\u308a\u3001\u3053\u308c\u306fMCFG\u30c6\u30fc\u30d6\u30eb\u3092\u8aad\u307f\u53d6\u308b\u3053\u3068\u3067\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u3060\u3068\u7406\u89e3\u3057\u3066\u307e\u3057\u305f\u3002\u3053\u308c\u306b\u3064\u3044\u3066\u306f\u3001”Static tables like MCFG, HPET, ECDT, etc., are not mechanisms for reserving address space. The static tables are for things the OS needs to know early in boot, before it can parse the ACPI namespace. “\u3068\u3042\u308a\u3001MCFG\u306a\u3069\u306e\u9759\u7684\u30c6\u30fc\u30d6\u30eb\u306f\u3042\u304f\u307e\u3067\u8d77\u52d5\u521d\u671f\u306b\u66ab\u5b9a\u7684\u306b\u4f7f\u7528\u3059\u308b\u4e8b\u3092\u76ee\u7684\u3068\u3057\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u3002
PCI host bridge\u306b\u3064\u3044\u3066\u3001”PCI host bridges are PNP0A03 or PNP0A08 devices.”\u3068\u3042\u308a\u3001_HID\u304c\u3053\u308c\u3067\u3042\u308b\u30c7\u30d0\u30a4\u30b9\u3092\u898b\u3064\u3051\u3066\u304f\u308c\u3070\u826f\u3044\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u3055\u3066\u3001\u4eca\u56de\u4f7f\u7528\u3057\u3066\u3044\u308b\u30c7\u30d0\u30a4\u30b9\u306eDSDT\/SSDT\u3092iasl\u3067\u30c7\u30a3\u30b9\u30a2\u30bb\u30f3\u30d6\u30eb\u3057\u3001”PNP0A08″\u3092\u63a2\u3057\u3066\u307f\u305f\u7d50\u679c\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30c7\u30d0\u30a4\u30b9\u304c\u898b\u3064\u304b\u308a\u307e\u3057\u305f\u3002(\u5fc5\u8981\u306a\u90e8\u5206\u306e\u307f\u629c\u7c8b)<\/p>\n\n\n\n
    Scope (_SB)\n    {\n        Device (PCI0)\n        {\n            Name (_HID, EisaId (\"PNP0A08\") \/* PCI Express Bus *\/)  \/\/ _HID: Hardware ID\n            Name (_CID, EisaId (\"PNP0A03\") \/* PCI Bus *\/)  \/\/ _CID: Compatible ID\n            Name (_SEG, Zero)  \/\/ _SEG: PCI Segment\n            Name (_BBN, Zero)  \/\/ _BBN: BIOS Bus Number\n\n            Method (_CRS, 0, Serialized)  \/\/ _CRS: Current Resource Settings\n            {\n                Name (RBUF, ResourceTemplate ()\n                {\n                    WordBusNumber (ResourceProducer, MinFixed, MaxFixed, PosDecode,\n                        0x0000,             \/\/ Granularity\n                        0x0000,             \/\/ Range Minimum\n                        0x00FD,             \/\/ Range Maximum\n                        0x0000,             \/\/ Translation Offset\n                        0x00FE,             \/\/ Length\n                        ,, )\n                    QWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed, Cacheable, ReadWrite,\n                        0x0000000000000000, \/\/ Granularity\n                        0x0000000000000000, \/\/ Range Minimum\n                        0x000000007FFFFFFF, \/\/ Range Maximum\n                        0x000000E000000000, \/\/ Translation Offset\n                        0x0000000080000000, \/\/ Length\n                        ,, , AddressRangeMemory, TypeStatic)\n                    QWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed, Prefetchable, ReadWrite,\n                        0x0000000000000000, \/\/ Granularity\n                        0x000000E200000000, \/\/ Range Minimum\n                        0x000000FFFFFFFFFF, \/\/ Range Maximum\n                        0x0000000000000000, \/\/ Translation Offset\n                        0x0000001E00000000, \/\/ Length\n                        ,, , AddressRangeMemory, TypeStatic)\n                })\n                Return (RBUF) \/* \\_SB_.PCI0._CRS.RBUF *\/\n            }\n}<\/code><\/pre>\n\n\n\n
_CRS\u95a2\u6570\u3067\u306f\u30013\u3064\u306e\u30ea\u30bd\u30fc\u30b9\u304c\u8a18\u8ff0\u3055\u308c\u3066\u3044\u307e\u3059\u3002
_CRS\u95a2\u6570\u306e\u8fd4\u3059\u5024\u306b\u3064\u3044\u3066\u306e\u8aac\u660e\u306f\u3001Device Configuration \u2014 ACPI Specification 6.4 documentation<\/a> \u306b\u3042\u308a\u307e\u3059\u3002
QWordMemory<\/a> \u306e\u9805\u3092\u898b\u308b\u3068\u3001”Address Translation offset”\u3068\u3044\u3046\u3082\u306e\u304c\u3042\u308a\u3001_CRS\u306e\u8fd4\u3059\u30a8\u30f3\u30c8\u30ea\u306e2\u756a\u76ee\u3092\u898b\u308b\u3068\u3001”0x000000E000000000, \/\/ Translation Offset”\u3068\u3042\u308a\u3001\u3053\u308c\u304c\u5de1\u308a\u5de1\u3063\u3066\u3001 offset<\/code> \u306e\u5024\u306b\u306a\u3063\u3066\u3044\u308b\u3068\u8003\u3048\u308b\u3068\u4e0d\u53ef\u89e3\u306a\u6319\u52d5\u3082\u7d0d\u5f97\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u691c\u8a3c<\/h2>\n\n\n\n
\u4eca\u307e\u3067\u306e\u30b3\u30fc\u30c9\u30ea\u30fc\u30c7\u30a3\u30f3\u30b0\u3067\u7acb\u3066\u305f\u4eee\u8aac\u3092\u691c\u8a3c\u3059\u308b\u305f\u3081\u306bLinux Kernel\u306b pr_info<\/code> \u3092\u52a0\u3048\u3066\u5024\u306e\u78ba\u8a8d\u3092\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n\n\n\n
\u307e\u305a\u306f\u3001 pci_std_update_resource<\/code> \u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u66f8\u304d\u63db\u3048\u307e\u3059\u3002<\/p>\n\n\n\n
        pr_info(\"%s: res->start = 0x%llx\\n\", __func__, res->start);\n        pcibios_resource_to_bus(dev->bus, &region, res);\n        pr_info(\"%s: region.start = 0x%llx\\n\", __func__, region.start);\n        new = region.start;<\/code><\/pre>\n\n\n\n
\u6b21\u306b\u3001 pcibios_resource_to_bus<\/code> \u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u66f8\u304d\u63db\u3048\u307e\u3059\u3002<\/p>\n\n\n\n
        resource_list_for_each_entry(window, &bridge->windows) {\n                if (resource_contains(window->res, res)) {\n                        pr_info(\"%s: window->offset: 0x%llx\\n\", __func__, window->offset);\n                        offset = window->offset;\n                        break;\n                }\n        }<\/code><\/pre>\n\n\n\n
\u66f4\u306b\u3001 acpi_dev_new_resource_entry<\/code> \u306b\u3082 pr_info<\/code> \u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
        *rentry->res = win->res;\n        pr_info(\"%s: win->offset: 0x%llx\\n\", __func__, win->offset);\n        rentry->offset = win->offset;<\/code><\/pre>\n\n\n\n
acpi_dev_resource_address_space<\/code> \u304b acpi_dev_resource_ext_address_space<\/code> \u306b\u3082\u547c\u3070\u308c\u305f\u75d5\u8de1\u304c\u6b8b\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
bool acpi_dev_resource_address_space(struct acpi_resource *ares,\n\t\t\t\t     struct resource_win *win)\n{\n\tstruct acpi_resource_address64 addr;\n\n\twin->res.flags = 0;\n\tif (ACPI_FAILURE(acpi_resource_to_address64(ares, &addr)))\n\t\treturn false;\n        pr_info(\"%s: Called\\n\", __func__);\n\treturn acpi_decode_space(win, (struct acpi_resource_address *)&addr,\n}<\/code><\/pre>\n\n\n\n
bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares,\n                                         struct resource_win *win)\n{\n        struct acpi_resource_extended_address64 *ext_addr;\n\n        win->res.flags = 0;\n        if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64)\n                return false;\n\n        ext_addr = &ares->data.ext_address64;\n        pr_info(\"%s: Called\\n\", __func__);\n        return acpi_decode_space(win, (struct acpi_resource_address *)ext_addr,\n                                 &ext_addr->address);\n}<\/code><\/pre>\n\n\n\n
\u6700\u5f8c\u306b\u3001 acpi_pci_probe_root_resources<\/code> \u3082\u4e88\u60f3\u3057\u305f\u30c7\u30d0\u30a4\u30b9\u304c\u8a55\u4fa1\u3055\u308c\u3066\u3044\u308b\u304b\u8868\u793a\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info)\n{\n        int ret;\n        struct list_head *list = &info->resources;\n        struct acpi_device *device = info->bridge;\n        struct resource_entry *entry, *tmp;\n        unsigned long flags;\n\n        flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT;\n        pr_info(\"%s: probe %s\\n\", __func__, info->name);\n        \/\/ ...\n}<\/code><\/pre>\n\n\n\n
\u3053\u308c\u3089\u306e\u5909\u66f4\u3092\u9069\u7528\u3057\u305fLinux Kernel\u3092\u30d3\u30eb\u30c9\u3057\u3066\u5dee\u3057\u66ff\u3048\u3066\u8d77\u52d5\u3057\u3066\u307f\u307e\u3059\u3002
\u307e\u305a\u306f\u3001PCI Root Bus\u3092\u8a8d\u8b58\u3057\u3066\u3044\u308b\u4ed8\u8fd1\u306eBoot Message\u3092\u898b\u3066\u307f\u307e\u3059\u3002<\/p>\n\n\n\n
[   24.084991] acpi PNP0A08:00: ECAM area [mem 0xe100000000-0xe10fdfffff] reserved by PNP0C02:00\n[   24.093530] acpi PNP0A08:00: ECAM at [mem 0xe100000000-0xe10fdfffff] for [bus 00-fd]\n[   24.101266] acpi_pci_probe_root_resources: probe PCI Bus 0000:00\n[   24.201701] acpi_dev_resource_address_space: Called\n[   24.206568] acpi_dev_new_resource_entry: win->offset: 0xe000000000\n[   24.212736] acpi_dev_resource_address_space: Called\n[   24.217603] acpi_dev_new_resource_entry: win->offset: 0x0\n[   24.223076] PCI host bridge to bus 0000:00\n[   24.227166] pci_bus 0000:00: root bus resource [mem 0xe000000000-0xe07fffffff window] (bus address [0x00000000-0x7fffffff])\n[   24.238283] pci_bus 0000:00: root bus resource [mem 0xe200000000-0xffffffffff pref window]\n[   24.246535] pci_bus 0000:00: root bus resource [bus 00-fd]<\/code><\/pre>\n\n\n\n
acpi_pci_probe_root_resources<\/code> \u2192 acpi_dev_resource_address_space<\/code> \u2192 acpi_dev_new_resource_entry<\/code> \u306e\u9806\u756a\u3067\u547c\u3070\u308c\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u306d\u3002Translation Offset\u306e\u5024\u304c\u53d6\u308a\u51fa\u3055\u308c\u3001resource\u304c\u4f5c\u6210\u3055\u308c\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u3002
\u6b21\u306b\u3001\u5b9f\u969b\u306bVirtIO Network Device\u306eBAR\u306b\u5024\u304c\u66f8\u304d\u8fbc\u307e\u308c\u3066\u3044\u308b\u6240\u3092\u898b\u3066\u307f\u307e\u3059\u3002<\/p>\n\n\n\n
[   24.462843] pci 0000:00:01.0: BAR 0: assigned [mem 0xe000200000-0xe000200fff 64bit]\n[   24.470487] pci_std_update_resource: res->start = 0xe000200000\n[   24.476308] pcibios_resource_to_bus: window->offset: 0xe000000000\n[   24.482389] pci_std_update_resource: region.start = 0x200000<\/code><\/pre>\n\n\n\n
\u4e88\u60f3\u901a\u308a\u3001Translation Offset\u306e\u5024\u304c\u3053\u3053\u306b\u4f1d\u64ad\u3057\u3001 region.start<\/code> \u306e\u5024\u304c\u5909\u66f4\u3055\u308c\u3066\u3044\u307e\u3059\u3002
\u691c\u8a3c\u306e\u7d50\u679c\u3001\u4e88\u60f3\u3069\u304a\u308a\u306e\u6319\u52d5\u3092\u793a\u3057\u3066\u3044\u308b\u4e8b\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
\u7d50\u8ad6<\/h2>\n\n\n\n
PCI\u306eBase Address Register\u306e\u5024\u3092\u8aad\u307f\u66f8\u304d\u3059\u308b\u969b\u306fDSDT\/SSDT\u306eAML\u3092\u3088\u304f\u8aad\u3093\u3067\u3001Translation Offset\u306e\u5024\u306b\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\u8ffd\u4f38<\/h2>\n\n\n\n
ACPI\u88ab\u5bb3\u8005\u306e\u4f1a\u306f\u968f\u6642\u4f1a\u54e1\u3092\u52df\u96c6\u3057\u3066\u304a\u308a\u307e\u3059\u3002
ACPI\u306e\u3042\u3093\u306a\u6319\u52d5\u3084\u3053\u3093\u306a\u6319\u52d5\u3067\u60a9\u307e\u3055\u308c\u305f\u65b9\u306f\u662f\u975e\u3001\u30d6\u30ed\u30b0\u8a18\u4e8b\u306a\u3069\u3067\u300cACPI\u88ab\u5bb3\u8005\u306e\u4f1a\u300d\u3068\u8a00\u3046\u30ef\u30fc\u30c9\u3068\u5171\u306b\u6295\u7a3f\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u3053\u306e\u6295\u7a3f\u306f\u3001Kernel\/VM\u63a2\u691c\u968a@\u5317\u9678 Part 6\u3067\u767a\u8868\u3092\u884c\u3063\u305f\u300cAArch64 ThinHypervisor\u958b\u767a\u8a18\u9332\u300d\u306e\u300cPCI Base Address Register\u306f\u7d76\u5bfe\u30a2\u30c9\u30ec\u30b9\u3058\u3083\u7121\u304b\u3063\u305f\u8a71\u300d\u3092\u8a73\u3057\u304f\u8aac […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-995","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/pg-mana.net\/blog\/wp-json\/wp\/v2\/posts\/995","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pg-mana.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pg-mana.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pg-mana.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pg-mana.net\/blog\/wp-json\/wp\/v2\/comments?post=995"}],"version-history":[{"count":0,"href":"https:\/\/pg-mana.net\/blog\/wp-json\/wp\/v2\/posts\/995\/revisions"}],"wp:attachment":[{"href":"https:\/\/pg-mana.net\/blog\/wp-json\/wp\/v2\/media?parent=995"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pg-mana.net\/blog\/wp-json\/wp\/v2\/categories?post=995"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pg-mana.net\/blog\/wp-json\/wp\/v2\/tags?post=995"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}