X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/5486af56a526398455ca6fa212e7b43c72daec98..1fe5f5eb5378a47bf0f3451762743c162e40faad:/lunaix-os/hal/pci.c diff --git a/lunaix-os/hal/pci.c b/lunaix-os/hal/pci.c index 8bc35ce..1457aa1 100644 --- a/lunaix-os/hal/pci.c +++ b/lunaix-os/hal/pci.c @@ -1,27 +1,48 @@ +/** + * @file pci.c + * @author Lunaixsky (zelong56@gmail.com) + * @brief A software implementation of PCI Local Bus Specification Revision 3.0 + * @version 0.1 + * @date 2022-06-28 + * + * @copyright Copyright (c) 2022 + * + */ #include -#include +#include + +#include +#include +#include +#include #include LOG_MODULE("PCI") -static struct llist_header pci_devices; +static DEFINE_LLIST(pci_devices); +static DEFINE_LLIST(pci_drivers); + +void +pci_probe_msi_info(struct pci_device* device); void pci_probe_device(int bus, int dev, int funct) { - pci_reg_t reg1 = pci_read_cspace(bus, dev, funct, 0); - uint32_t vendor = reg1 & 0xffff; - pci_reg_t dev_id = reg1 >> 16; + u32_t base = PCI_ADDRESS(bus, dev, funct); + pci_reg_t reg1 = pci_read_cspace(base, 0); // Vendor=0xffff则表示设备不存在 - if (vendor == PCI_VENDOR_INVLD) { + if (PCI_DEV_VENDOR(reg1) == PCI_VENDOR_INVLD) { return; } - pci_reg_t hdr_type = pci_read_cspace(bus, dev, funct, 3); + pci_reg_t hdr_type = pci_read_cspace(base, 0xc); hdr_type = (hdr_type >> 16) & 0xff; - if ((hdr_type & 0x80)) { + // 防止堆栈溢出 + // QEMU的ICH9/Q35实现似乎有点问题，对于多功能设备的每一个功能的header type + // 都将第七位置位。而virtualbox 就没有这个毛病。 + if ((hdr_type & 0x80) && funct == 0) { hdr_type = hdr_type & ~0x80; // 探测多用途设备（multi-function device） for (int i = 1; i < 7; i++) { @@ -29,31 +50,41 @@ pci_probe_device(int bus, int dev, int funct) } } - if (hdr_type != 0) { + if (hdr_type != PCI_TDEV) { // XXX: 目前忽略所有桥接设备，比如PCI-PCI桥接器，或者是CardBus桥接器 return; } - pci_reg_t intr = pci_read_cspace(bus, dev, funct, 15); - pci_reg_t class = pci_read_cspace(bus, dev, funct, 2) >> 8; + pci_reg_t intr = pci_read_cspace(base, 0x3c); + pci_reg_t class = pci_read_cspace(base, 0x8); - struct pci_device* device = lxmalloc(sizeof(struct pci_device)); - *device = (struct pci_device){ .bus = bus, - .dev = dev, - .function = funct, - .class_code = class, - .vendor = vendor, - .deviceId = dev_id, - .type = hdr_type, - .intr_line = intr & 0xff, - .intr_pintype = (intr >> 8) & 0xff }; + struct pci_device* device = vzalloc(sizeof(struct pci_device)); + *device = (struct pci_device){ .cspace_base = base, + .class_info = class, + .device_info = reg1, + .intr_info = intr }; - // 读取设备的内存映射的寄存器的基地址 - for (int i = 0; i < 6; i++) { - device->bars[i] = pci_read_cspace(bus, dev, funct, 4 + i); - } + pci_probe_msi_info(device); + pci_probe_bar_info(device); llist_append(&pci_devices, &device->dev_chain); + + if (!pci_bind_driver(device)) { + kprintf(KWARN "dev.%d:%d:%d %x:%x unknown device\n", + bus, + dev, + funct, + PCI_DEV_VENDOR(reg1), + PCI_DEV_DEVID(reg1)); + } else { + kprintf("dev.%d:%d:%d %x:%x %s\n", + bus, + dev, + funct, + PCI_DEV_VENDOR(reg1), + PCI_DEV_DEVID(reg1), + device->driver.type->name); + } } void @@ -61,7 +92,7 @@ pci_probe() { // 暴力扫描所有PCI设备 // XXX: 尽管最多会有256条PCI总线，但就目前而言，只考虑bus #0就足够了 - for (int bus = 0; bus < 1; bus++) { + for (int bus = 0; bus < 256; bus++) { for (int dev = 0; dev < 32; dev++) { pci_probe_device(bus, dev, 0); } @@ -69,34 +100,190 @@ pci_probe() } void -pci_print_device() +pci_probe_bar_info(struct pci_device* device) +{ + u32_t bar; + struct pci_base_addr* ba; + for (size_t i = 0; i < 6; i++) { + ba = &device->bar[i]; + ba->size = pci_bar_sizing(device, &bar, i + 1); + if (PCI_BAR_MMIO(bar)) { + ba->start = PCI_BAR_ADDR_MM(bar); + ba->type |= PCI_BAR_CACHEABLE(bar) ? BAR_TYPE_CACHABLE : 0; + ba->type |= BAR_TYPE_MMIO; + } else { + ba->start = PCI_BAR_ADDR_IO(bar); + } + } +} + +void +pci_probe_msi_info(struct pci_device* device) +{ + // Note that Virtualbox have to use ICH9 chipset for MSI support. + // Qemu seems ok with default PIIX3, Bochs is pending to test... + // See https://www.virtualbox.org/manual/ch03.html (section 3.5.1) + pci_reg_t status = + pci_read_cspace(device->cspace_base, PCI_REG_STATUS_CMD) >> 16; + + if (!(status & 0x10)) { + device->msi_loc = 0; + return; + } + + pci_reg_t cap_ptr = pci_read_cspace(device->cspace_base, 0x34) & 0xff; + u32_t cap_hdr; + + while (cap_ptr) { + cap_hdr = pci_read_cspace(device->cspace_base, cap_ptr); + if ((cap_hdr & 0xff) == 0x5) { + // MSI + device->msi_loc = cap_ptr; + return; + } + cap_ptr = (cap_hdr >> 8) & 0xff; + } +} + +static void +__pci_read_cspace(struct twimap* map) +{ + struct pci_device* pcidev = (struct pci_device*)(map->data); + + for (size_t i = 0; i < 256; i += sizeof(pci_reg_t)) { + *(pci_reg_t*)(map->buffer + i) = + pci_read_cspace(pcidev->cspace_base, i); + } + + map->size_acc = 256; +} + +static void +__pci_read_revid(struct twimap* map) +{ + int class = twimap_data(map, struct pci_device*)->class_info; + twimap_printf(map, "0x%x", PCI_DEV_REV(class)); +} + +static void +__pci_read_class(struct twimap* map) +{ + int class = twimap_data(map, struct pci_device*)->class_info; + twimap_printf(map, "0x%x", PCI_DEV_CLASS(class)); +} + +static void +__pci_bar_read(struct twimap* map) +{ + struct pci_device* pcidev = twimap_data(map, struct pci_device*); + int bar_index = twimap_index(map, int); + + struct pci_base_addr* bar = &pcidev->bar[bar_index]; + + if (!bar->start && !bar->size) { + twimap_printf(map, "[%d] not present \n", bar_index); + return; + } + + twimap_printf( + map, "[%d] base=%.8p, size=%.8p, ", bar_index, bar->start, bar->size); + + if ((bar->type & BAR_TYPE_MMIO)) { + twimap_printf(map, "mmio"); + if ((bar->type & BAR_TYPE_CACHABLE)) { + twimap_printf(map, ", prefetchable"); + } + } else { + twimap_printf(map, "io"); + } + + twimap_printf(map, "\n"); +} + +static int +__pci_bar_gonext(struct twimap* map) +{ + if (twimap_index(map, int) >= 5) { + return 0; + } + map->index += 1; + return 1; +} + +void +pci_build_fsmapping() +{ + struct twifs_node *pci_class = twifs_dir_node(NULL, "pci"), *pci_dev; + struct pci_device *pos, *n; + struct twimap* map; + llist_for_each(pos, n, &pci_devices, dev_chain) + { + pci_dev = twifs_dir_node(pci_class, + "%.2d:%.2d:%.2d.%.4x:%.4x", + PCI_BUS_NUM(pos->cspace_base), + PCI_SLOT_NUM(pos->cspace_base), + PCI_FUNCT_NUM(pos->cspace_base), + PCI_DEV_VENDOR(pos->device_info), + PCI_DEV_DEVID(pos->device_info)); + + map = twifs_mapping(pci_dev, pos, "config"); + map->read = __pci_read_cspace; + + map = twifs_mapping(pci_dev, pos, "revision"); + map->read = __pci_read_revid; + + map = twifs_mapping(pci_dev, pos, "class"); + map->read = __pci_read_class; + + map = twifs_mapping(pci_dev, pos, "io_bases"); + map->read = __pci_bar_read; + map->go_next = __pci_bar_gonext; + } +} +EXPORT_TWIFS_PLUGIN(pci_devs, pci_build_fsmapping); + +size_t +pci_bar_sizing(struct pci_device* dev, u32_t* bar_out, u32_t bar_num) +{ + pci_reg_t bar = pci_read_cspace(dev->cspace_base, PCI_REG_BAR(bar_num)); + if (!bar) { + *bar_out = 0; + return 0; + } + + pci_write_cspace(dev->cspace_base, PCI_REG_BAR(bar_num), 0xffffffff); + pci_reg_t sized = + pci_read_cspace(dev->cspace_base, PCI_REG_BAR(bar_num)) & ~0x1; + if (PCI_BAR_MMIO(bar)) { + sized = PCI_BAR_ADDR_MM(sized); + } + *bar_out = bar; + pci_write_cspace(dev->cspace_base, PCI_REG_BAR(bar_num), bar); + return ~sized + 1; +} + +struct pci_device* +pci_get_device_by_id(u16_t vendorId, u16_t deviceId) { + u32_t dev_info = vendorId | (deviceId << 16); struct pci_device *pos, *n; llist_for_each(pos, n, &pci_devices, dev_chain) { - kprintf(KINFO "(B%xh:D%xh:F%xh) Dev %x:%x, Class 0x%x\n", - pos->bus, - pos->dev, - pos->function, - pos->vendor, - pos->deviceId, - pos->class_code); - - for (int i = 0; i < 6; i++) { - kprintf(KINFO "\t BAR#%d: %p\n", i, pos->bars[i]); + if (pos->device_info == dev_info) { + return pos; } - kprintf( - KINFO "\t IRQ: %d, INT#x: %d\n\n", pos->intr_line, pos->intr_pintype); } + + return NULL; } struct pci_device* -pci_get_device(uint16_t vendorId, uint16_t deviceId) +pci_get_device_by_class(u32_t class) { struct pci_device *pos, *n; llist_for_each(pos, n, &pci_devices, dev_chain) { - if (pos->vendor == vendorId && pos->deviceId == deviceId) { + if (PCI_DEV_CLASS(pos->class_info) == class) { return pos; } } @@ -105,8 +292,56 @@ pci_get_device(uint16_t vendorId, uint16_t deviceId) } void -pci_init() +pci_add_driver(const char* name, + u32_t class, + u32_t vendor, + u32_t devid, + pci_drv_init init) +{ + struct pci_driver* pci_drv = valloc(sizeof(*pci_drv)); + *pci_drv = (struct pci_driver){ .create_driver = init, + .dev_info = (vendor << 16) | devid, + .dev_class = class }; + if (name) { + strncpy(pci_drv->name, name, PCI_DRV_NAME_LEN); + } + + llist_append(&pci_drivers, &pci_drv->drivers); +} + +int +pci_bind_driver(struct pci_device* pci_dev) +{ + struct pci_driver *pos, *n; + llist_for_each(pos, n, &pci_drivers, drivers) + { + if (pos->dev_info) { + if (pos->dev_info == pci_dev->device_info) { + goto check_type; + } + continue; + } + check_type: + if (pos->dev_class) { + if (pos->dev_class == PCI_DEV_CLASS(pci_dev->class_info)) { + pci_dev->driver.type = pos; + pci_dev->driver.instance = pos->create_driver(pci_dev); + return 1; + } + } + } + return 0; +} + +void +pci_load_devices() { - llist_init_head(&pci_devices); + int i = 0; + struct pci_driver* dev; + ldga_foreach(pci_dev_drivers, struct pci_driver*, i, dev) + { + llist_append(&pci_drivers, &dev->drivers); + } + pci_probe(); } \ No newline at end of file