feat: (twimap) provide an easy way for mapping kernel objects into filesystem

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

diff --git a/lunaix-os/hal/pci.c b/lunaix-os/hal/pci.c
index ca31e21c7656d05eddd6a9931429a588c3fe0cb4..893a0bbd00920a833a997e74b319a752f19635f2 100644 (file)
--- a/lunaix-os/hal/pci.c
+++ b/lunaix-os/hal/pci.c
@@ -56,13 +56,14 @@ pci_probe_device(int bus, int dev, int funct)
     pci_reg_t intr = pci_read_cspace(base, 0x3c);
     pci_reg_t class = pci_read_cspace(base, 0x8);
 
-    struct pci_device* device = valloc(sizeof(struct pci_device));
+    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 };
 
     pci_probe_msi_info(device);
+    pci_probe_bar_info(device);
 
     llist_append(&pci_devices, &device->dev_chain);
 }
@@ -79,6 +80,24 @@ pci_probe()
     }
 }
 
+void
+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)
 {
@@ -107,23 +126,69 @@ pci_probe_msi_info(struct pci_device* device)
     }
 }
 
-#define PCI_PRINT_BAR_LISTING
+void
+__pci_read_cspace(struct twimap* map)
+{
+    struct pci_device* pcidev = (struct pci_device*)(map->data);
 
-int
-__pci_read_cspace(struct v_inode* inode, void* buffer, size_t len, size_t fpos)
+    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)
 {
-    if (len < 256) {
-        return ERANGE;
+    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;
     }
 
-    struct twifs_node* node = (struct twifs_node*)(inode->data);
-    struct pci_device* pcidev = (struct pci_device*)(node->data);
+    twimap_printf(
+      map, "[%d] base=%p, size=%p, ", bar_index, bar->start, bar->size);
 
-    for (size_t i = 0; i < 256; i += sizeof(pci_reg_t)) {
-        *(pci_reg_t*)(buffer + i) = pci_read_cspace(pcidev->cspace_base, i);
+    if ((bar->type & BAR_TYPE_MMIO)) {
+        twimap_printf(map, "mmio");
+        if ((bar->type & BAR_TYPE_CACHABLE)) {
+            twimap_printf(map, ", cachable");
+        }
+    } else {
+        twimap_printf(map, "io");
     }
 
-    return 256;
+    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
@@ -131,18 +196,29 @@ 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,
-                                 "B%d:D%d:F%d.%x:%x",
+                                 "%.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));
-        struct twifs_node* fnode = twifs_file_node(pci_dev, "cspace");
-        fnode->data = pos;
-        fnode->ops.read = __pci_read_cspace;
+
+        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;
     }
 }