+/**
+ * @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 <hal/acpi/acpi.h>
+#include <hal/apic.h>
#include <hal/pci.h>
-#include <lunaix/mm/kalloc.h>
+#include <lunaix/fs/twifs.h>
+#include <lunaix/mm/valloc.h>
+#include <lunaix/spike.h>
#include <lunaix/syslog.h>
LOG_MODULE("PCI")
static struct llist_header pci_devices;
+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;
+ uint32_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++) {
}
}
- 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);
}
{
// 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);
}
}
void
-pci_print_device()
+pci_probe_bar_info(struct pci_device* device)
+{
+ uint32_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;
+ uint32_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;
+ }
+}
+
+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;
+}
+
+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));
+}
+
+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));
+}
+
+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");
+}
+
+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)
{
- 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]);
+ 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;
+ }
+}
+
+size_t
+pci_bar_sizing(struct pci_device* dev, uint32_t* bar_out, uint32_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;
+}
+
+void
+pci_setup_msi(struct pci_device* device, int vector)
+{
+ // Dest: APIC#0, Physical Destination, No redirection
+ uint32_t msi_addr = (__APIC_BASE_PADDR);
+
+ // Edge trigger, Fixed delivery
+ uint32_t msi_data = vector;
+
+ pci_write_cspace(
+ device->cspace_base, PCI_MSI_ADDR(device->msi_loc), msi_addr);
+
+ pci_reg_t reg1 = pci_read_cspace(device->cspace_base, device->msi_loc);
+ pci_reg_t msg_ctl = reg1 >> 16;
+
+ int offset = !!(msg_ctl & MSI_CAP_64BIT) * 4;
+ pci_write_cspace(device->cspace_base,
+ PCI_MSI_DATA(device->msi_loc, offset),
+ msi_data & 0xffff);
+
+ if ((msg_ctl & MSI_CAP_MASK)) {
+ pci_write_cspace(
+ device->cspace_base, PCI_MSI_MASK(device->msi_loc, offset), 0);
+ }
+
+ // manipulate the MSI_CTRL to allow device using MSI to request service.
+ reg1 = (reg1 & 0xff8fffff) | 0x10000;
+ pci_write_cspace(device->cspace_base, device->msi_loc, reg1);
+}
+
+struct pci_device*
+pci_get_device_by_id(uint16_t vendorId, uint16_t deviceId)
+{
+ uint32_t dev_info = vendorId | (deviceId << 16);
+ struct pci_device *pos, *n;
+ llist_for_each(pos, n, &pci_devices, dev_chain)
+ {
+ 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(uint32_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;
}
}
pci_init()
{
llist_init_head(&pci_devices);
+ acpi_context* acpi = acpi_get_context();
+ assert_msg(acpi, "ACPI not initialized.");
+ if (acpi->mcfg.alloc_num) {
+ // PCIe Enhanced Configuration Mechanism is supported.
+ // TODO: support PCIe addressing mechanism
+ }
+ // Otherwise, fallback to use legacy PCI 3.0 method.
pci_probe();
+
+ pci_build_fsmapping();
}
\ No newline at end of file
git://scm.lunaixsky.com / lunaix-os.git / blobdiff