feat: MSI capability detection.

[lunaix-os.git] / lunaix-os / hal / pci.c

diff --git a/lunaix-os/hal/pci.c b/lunaix-os/hal/pci.c
index 8bc35cee55cbdd56a5422b2462304c57b6f3a2a9..90011c6eb200a4ebcdca165afe2d74cda52e9d09 100644 (file)
--- a/lunaix-os/hal/pci.c
+++ b/lunaix-os/hal/pci.c
@@ -6,19 +6,21 @@ 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)) {
@@ -34,24 +36,16 @@ pci_probe_device(int bus, int dev, int funct)
         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 };
-
-    // 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);
-    }
+    *device = (struct pci_device){ .cspace_base = base,
+                                   .class_info = class,
+                                   .device_info = reg1,
+                                   .intr_info = intr };
+
+    pci_probe_msi_info(device);
 
     llist_append(&pci_devices, &device->dev_chain);
 }
@@ -68,6 +62,31 @@ pci_probe()
     }
 }
 
+void
+pci_probe_msi_info(struct pci_device* device)
+{
+    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_print_device()
 {
@@ -75,28 +94,45 @@ pci_print_device()
     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_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),
+                PCI_DEV_CLASS(pos->class_info));
+
+        kprintf(KINFO "\t IRQ: %d, INT#x: %d\n",
+                PCI_INTR_IRQ(pos->intr_info),
+                PCI_INTR_PIN(pos->intr_info));
+
+        if (pos->msi_loc) {
+            kprintf(KINFO "\t MSI supported (@%xh)\n", pos->msi_loc);
         }
-        kprintf(
-          KINFO "\t IRQ: %d, INT#x: %d\n\n", pos->intr_line, pos->intr_pintype);
     }
 }
 
 struct pci_device*
-pci_get_device(uint16_t vendorId, uint16_t deviceId)
+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;
+        }
+    }
+
+    return NULL;
+}
+
+struct pci_device*
+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;
         }
     }