1 #include <hal/acpi/acpi.h>
4 #include <lunaix/mm/kalloc.h>
5 #include <lunaix/spike.h>
6 #include <lunaix/syslog.h>
10 static struct llist_header pci_devices;
13 pci_probe_msi_info(struct pci_device* device);
16 pci_probe_device(int bus, int dev, int funct)
18 uint32_t base = PCI_ADDRESS(bus, dev, funct);
19 pci_reg_t reg1 = pci_read_cspace(base, 0);
21 // Vendor=0xffff则表示设备不存在
22 if (PCI_DEV_VENDOR(reg1) == PCI_VENDOR_INVLD) {
26 pci_reg_t hdr_type = pci_read_cspace(base, 0xc);
27 hdr_type = (hdr_type >> 16) & 0xff;
30 // 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
31 // 都将第七位置位。而virtualbox 就没有这个毛病。
32 if ((hdr_type & 0x80) && funct == 0) {
33 hdr_type = hdr_type & ~0x80;
34 // 探测多用途设备(multi-function device)
35 for (int i = 1; i < 7; i++) {
36 pci_probe_device(bus, dev, i);
40 if (hdr_type != PCI_TDEV) {
41 // 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
45 pci_reg_t intr = pci_read_cspace(base, 0x3c);
46 pci_reg_t class = pci_read_cspace(base, 0x8);
48 struct pci_device* device = lxmalloc(sizeof(struct pci_device));
49 *device = (struct pci_device){ .cspace_base = base,
54 pci_probe_msi_info(device);
56 llist_append(&pci_devices, &device->dev_chain);
63 // 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
64 for (int bus = 0; bus < 1; bus++) {
65 for (int dev = 0; dev < 32; dev++) {
66 pci_probe_device(bus, dev, 0);
72 pci_probe_msi_info(struct pci_device* device)
74 // Note that Virtualbox have to use ICH9 chipset for MSI support.
75 // Qemu seems ok with default PIIX3, Bochs is pending to test...
76 // See https://www.virtualbox.org/manual/ch03.html (section 3.5.1)
78 pci_read_cspace(device->cspace_base, PCI_REG_STATUS_CMD) >> 16;
80 if (!(status & 0x10)) {
85 pci_reg_t cap_ptr = pci_read_cspace(device->cspace_base, 0x34) & 0xff;
89 cap_hdr = pci_read_cspace(device->cspace_base, cap_ptr);
90 if ((cap_hdr & 0xff) == 0x5) {
92 device->msi_loc = cap_ptr;
95 cap_ptr = (cap_hdr >> 8) & 0xff;
99 #define PCI_PRINT_BAR_LISTING
104 struct pci_device *pos, *n;
105 llist_for_each(pos, n, &pci_devices, dev_chain)
107 kprintf(KINFO "(B%xh:D%xh:F%xh) Dev %x:%x, Class 0x%x\n",
108 PCI_BUS_NUM(pos->cspace_base),
109 PCI_SLOT_NUM(pos->cspace_base),
110 PCI_FUNCT_NUM(pos->cspace_base),
111 PCI_DEV_VENDOR(pos->device_info),
112 PCI_DEV_DEVID(pos->device_info),
113 PCI_DEV_CLASS(pos->class_info));
115 kprintf(KINFO "\t IRQ: %d, INT#x: %d\n",
116 PCI_INTR_IRQ(pos->intr_info),
117 PCI_INTR_PIN(pos->intr_info));
118 #ifdef PCI_PRINT_BAR_LISTING
120 for (size_t i = 1; i <= 6; i++) {
121 size_t size = pci_bar_sizing(pos, &bar, i);
124 if (PCI_BAR_MMIO(bar)) {
125 kprintf(KINFO "\t BAR#%d (MMIO) %p [%d]\n",
127 PCI_BAR_ADDR_MM(bar),
130 kprintf(KINFO "\t BAR#%d (I/O) %p [%d]\n",
132 PCI_BAR_ADDR_IO(bar),
138 kprintf(KINFO "\t MSI supported (@%xh)\n", pos->msi_loc);
144 pci_bar_sizing(struct pci_device* dev, uint32_t* bar_out, uint32_t bar_num)
146 pci_reg_t bar = pci_read_cspace(dev->cspace_base, PCI_REG_BAR(bar_num));
152 pci_write_cspace(dev->cspace_base, PCI_REG_BAR(bar_num), 0xffffffff);
154 pci_read_cspace(dev->cspace_base, PCI_REG_BAR(bar_num)) & ~0x1;
155 if (PCI_BAR_MMIO(bar)) {
156 sized = PCI_BAR_ADDR_MM(sized);
163 pci_setup_msi(struct pci_device* device, int vector)
165 // Dest: APIC#0, Physical Destination, No redirection
166 uint32_t msi_addr = (__APIC_BASE_PADDR | 0x8);
168 // Edge trigger, Fixed delivery
169 uint32_t msi_data = vector;
172 device->cspace_base, PCI_MSI_ADDR(device->msi_loc), msi_addr);
174 device->cspace_base, PCI_MSI_DATA(device->msi_loc), msi_data & 0xffff);
176 pci_reg_t reg1 = pci_read_cspace(device->cspace_base, device->msi_loc);
178 // manipulate the MSI_CTRL to allow device using MSI to request service.
179 reg1 = ((((reg1 >> 16) & ~0x70) | 0x1) << 16) | (reg1 & 0xffff);
180 pci_write_cspace(device->cspace_base, device->msi_loc, reg1);
184 pci_get_device_by_id(uint16_t vendorId, uint16_t deviceId)
186 uint32_t dev_info = vendorId | (deviceId << 16);
187 struct pci_device *pos, *n;
188 llist_for_each(pos, n, &pci_devices, dev_chain)
190 if (pos->device_info == dev_info) {
199 pci_get_device_by_class(uint32_t class)
201 struct pci_device *pos, *n;
202 llist_for_each(pos, n, &pci_devices, dev_chain)
204 if (PCI_DEV_CLASS(pos->class_info) == class) {
215 llist_init_head(&pci_devices);
216 acpi_context* acpi = acpi_get_context();
217 assert_msg(acpi, "ACPI not initialized.");
218 if (acpi->mcfg.alloc_num) {
219 // PCIe Enhanced Configuration Mechanism is supported.
220 // TODO: support PCIe addressing mechanism
222 // Otherwise, fallback to use legacy PCI 3.0 method.