lspci: Show information also for devices with unknown header type

lspci sees header type with 0x7f value in case config space is not
accessible. It may be because of permission issues or missing backend
(e.g. on Windows) or because device itself does not respond to config
cycles and config space is inaccessible.

Inaccessible config space is common scenario for switchable PCIe GPU
cards. Some Nvidia and also some AMD cards when sleep then lspci sees
all-ones in their config space. But kernel has registered those cards and
some of their properties are cached ans available via sysfs or procfs (from
time when card was awake).

Currently lspci shows error message "Unknown header type 7f" and does not
parse any value neither from config space nor from sysfs backend.

So try to show at least information which kernel provided into libpci
struct pci_dev.

Set unknown values to zeros (instead of all-ones which are returned from
config space) and add a new function show_htype_unknown() for showing
additional information in case header type is unknown.

This change will also help new windows backend which has only emulated
config space and therefore valid data only in struct pci_dev.

1 files changed, 108 insertions, 27 deletions

diff --git a/lspci.c b/lspci.c
index b29580a..95a1318 100644
--- a/lspci.c
+++ b/lspci.c
@@ -354,7 +354,7 @@ show_size(u64 x)
 }
 
 static void
-show_range(char *prefix, u64 base, u64 limit, int bits, int disabled)
+show_range(const char *prefix, u64 base, u64 limit, int bits, int disabled)
 {
   printf("%s:", prefix);
   if (base <= limit || verbose > 2)
@@ -363,15 +363,39 @@ show_range(char *prefix, u64 base, u64 limit, int bits, int disabled)
     show_size(limit - base + 1);
   else
     printf(" [disabled]");
-  printf(" [%d-bit]", bits);
+  if (bits)
+    printf(" [%d-bit]", bits);
   putchar('\n');
 }
 
+static u32
+ioflg_to_pciflg(pciaddr_t ioflg)
+{
+  u32 flg;
+
+  if (ioflg & PCI_IORESOURCE_IO)
+    flg = PCI_BASE_ADDRESS_SPACE_IO;
+  else if (!(ioflg & PCI_IORESOURCE_MEM))
+    flg = 0;
+  else
+    {
+      flg = PCI_BASE_ADDRESS_SPACE_MEMORY;
+      if (ioflg & PCI_IORESOURCE_MEM_64)
+        flg |= PCI_BASE_ADDRESS_MEM_TYPE_64;
+      else
+        flg |= PCI_BASE_ADDRESS_MEM_TYPE_32;
+      if (ioflg & PCI_IORESOURCE_PREFETCH)
+        flg |= PCI_BASE_ADDRESS_MEM_PREFETCH;
+    }
+
+  return flg;
+}
+
 static void
-show_bases(struct device *d, int cnt)
+show_bases(struct device *d, int cnt, int without_config_data)
 {
   struct pci_dev *p = d->dev;
-  word cmd = get_conf_word(d, PCI_COMMAND);
+  word cmd = without_config_data ? (PCI_COMMAND_IO | PCI_COMMAND_MEMORY) : get_conf_word(d, PCI_COMMAND);
   int i;
   int virtual = 0;
 
@@ -380,7 +404,7 @@ show_bases(struct device *d, int cnt)
       pciaddr_t pos = p->base_addr[i];
       pciaddr_t len = (p->known_fields & PCI_FILL_SIZES) ? p->size[i] : 0;
       pciaddr_t ioflg = (p->known_fields & PCI_FILL_IO_FLAGS) ? p->flags[i] : 0;
-      u32 flg = get_conf_long(d, PCI_BASE_ADDRESS_0 + 4*i);
+      u32 flg = without_config_data ? ioflg_to_pciflg(ioflg) : get_conf_long(d, PCI_BASE_ADDRESS_0 + 4*i);
       u32 hw_lower;
       u32 hw_upper = 0;
       int broken = 0;
@@ -408,13 +432,14 @@ show_bases(struct device *d, int cnt)
 	      else
 		{
 		  i++;
+		  if (!without_config_data)
 		  hw_upper = get_conf_long(d, PCI_BASE_ADDRESS_0 + 4*i);
 		}
 	    }
 	}
 
       /* Detect virtual regions, which are reported by the OS, but unassigned in the device */
-      if (pos && !hw_lower && !hw_upper && !(ioflg & PCI_IORESOURCE_PCI_EA_BEI))
+      if (!without_config_data && pos && !hw_lower && !hw_upper && !(ioflg & PCI_IORESOURCE_PCI_EA_BEI))
 	{
 	  flg = pos;
 	  virtual = 1;
@@ -476,14 +501,14 @@ show_rom(struct device *d, int reg)
   pciaddr_t rom = p->rom_base_addr;
   pciaddr_t len = (p->known_fields & PCI_FILL_SIZES) ? p->rom_size : 0;
   pciaddr_t ioflg = (p->known_fields & PCI_FILL_IO_FLAGS) ? p->rom_flags : 0;
-  u32 flg = get_conf_long(d, reg);
-  word cmd = get_conf_word(d, PCI_COMMAND);
+  u32 flg = reg >= 0 ? get_conf_long(d, reg) : ioflg_to_pciflg(ioflg);
+  word cmd = reg >= 0 ? get_conf_word(d, PCI_COMMAND) : PCI_COMMAND_MEMORY;
   int virtual = 0;
 
   if (!rom && !flg && !len)
     return;
 
-  if ((rom & PCI_ROM_ADDRESS_MASK) && !(flg & PCI_ROM_ADDRESS_MASK) && !(ioflg & PCI_IORESOURCE_PCI_EA_BEI))
+  if (reg >= 0 && (rom & PCI_ROM_ADDRESS_MASK) && !(flg & PCI_ROM_ADDRESS_MASK) && !(ioflg & PCI_IORESOURCE_PCI_EA_BEI))
     {
       flg = rom;
       virtual = 1;
@@ -515,7 +540,7 @@ show_rom(struct device *d, int reg)
 static void
 show_htype0(struct device *d)
 {
-  show_bases(d, 6);
+  show_bases(d, 6, 0);
   show_rom(d, PCI_ROM_ADDRESS);
   show_caps(d, PCI_CAPABILITY_LIST);
 }
@@ -540,7 +565,7 @@ show_htype1(struct device *d)
   int pref_disabled = (p->known_fields & PCI_FILL_BRIDGE_BASES) && !p->bridge_size[2];
   int io_bits, pref_bits;
 
-  show_bases(d, 2);
+  show_bases(d, 2, 0);
   printf("\tBus: primary=%02x, secondary=%02x, subordinate=%02x, sec-latency=%d\n",
 	 get_conf_byte(d, PCI_PRIMARY_BUS),
 	 get_conf_byte(d, PCI_SECONDARY_BUS),
@@ -667,7 +692,7 @@ show_htype2(struct device *d)
   word exca;
   int verb = verbose > 2;
 
-  show_bases(d, 1);
+  show_bases(d, 1, 0);
   printf("\tBus: primary=%02x, secondary=%02x, subordinate=%02x, sec-latency=%d\n",
 	 get_conf_byte(d, PCI_CB_PRIMARY_BUS),
 	 get_conf_byte(d, PCI_CB_CARD_BUS),
@@ -727,19 +752,56 @@ show_htype2(struct device *d)
 }
 
 static void
+show_htype_unknown(struct device *d)
+{
+  struct pci_dev *p = d->dev;
+  u64 base, limit, flags;
+  const char *str;
+  int i, bits;
+
+  if (pacc->buscentric)
+    return;
+
+  show_bases(d, 6, 1);
+  for (i = 0; i < 4; i++)
+    {
+      if (!p->bridge_base_addr[i])
+        continue;
+      base = p->bridge_base_addr[i];
+      limit = base + p->bridge_size[i] - 1;
+      flags = p->bridge_flags[i];
+      if (flags & PCI_IORESOURCE_IO)
+        {
+          bits = (flags & PCI_IORESOURCE_IO_16BIT_ADDR) ? 16 : 32;
+          str = "\tI/O behind bridge";
+        }
+      else if (flags & PCI_IORESOURCE_MEM)
+        {
+          bits = (flags & PCI_IORESOURCE_MEM_64) ? 64 : 32;
+          if (flags & PCI_IORESOURCE_PREFETCH)
+            str = "\tPrefetchable memory behind bridge";
+          else
+            str = "\tMemory behind bridge";
+        }
+      else
+        {
+          bits = 0;
+          str = "\tUnknown resource behind bridge";
+        }
+      show_range(str, base, limit, bits, 0);
+    }
+  show_rom(d, -1);
+}
+
+static void
 show_verbose(struct device *d)
 {
   struct pci_dev *p = d->dev;
-  word status = get_conf_word(d, PCI_STATUS);
-  word cmd = get_conf_word(d, PCI_COMMAND);
+  int unknown_config_data = 0;
   word class = p->device_class;
-  byte bist = get_conf_byte(d, PCI_BIST);
   byte htype = get_conf_byte(d, PCI_HEADER_TYPE) & 0x7f;
-  byte latency = get_conf_byte(d, PCI_LATENCY_TIMER);
-  byte cache_line = get_conf_byte(d, PCI_CACHE_LINE_SIZE);
+  byte bist;
   byte max_lat, min_gnt;
-  byte int_pin = get_conf_byte(d, PCI_INTERRUPT_PIN);
-  unsigned int irq;
   char *dt_node, *iommu_group;
 
   show_terse(d);
@@ -747,29 +809,33 @@ show_verbose(struct device *d)
   pci_fill_info(p, PCI_FILL_IRQ | PCI_FILL_BASES | PCI_FILL_ROM_BASE | PCI_FILL_SIZES |
     PCI_FILL_PHYS_SLOT | PCI_FILL_NUMA_NODE | PCI_FILL_DT_NODE | PCI_FILL_IOMMU_GROUP |
     PCI_FILL_BRIDGE_BASES | PCI_FILL_CLASS_EXT | PCI_FILL_SUBSYS);
-  irq = p->irq;
 
   switch (htype)
     {
     case PCI_HEADER_TYPE_NORMAL:
       if (class == PCI_CLASS_BRIDGE_PCI)
 	printf("\t!!! Invalid class %04x for header type %02x\n", class, htype);
+      bist = get_conf_byte(d, PCI_BIST);
       max_lat = get_conf_byte(d, PCI_MAX_LAT);
       min_gnt = get_conf_byte(d, PCI_MIN_GNT);
       break;
     case PCI_HEADER_TYPE_BRIDGE:
       if ((class >> 8) != PCI_BASE_CLASS_BRIDGE)
 	printf("\t!!! Invalid class %04x for header type %02x\n", class, htype);
+      bist = get_conf_byte(d, PCI_BIST);
       min_gnt = max_lat = 0;
       break;
     case PCI_HEADER_TYPE_CARDBUS:
       if ((class >> 8) != PCI_BASE_CLASS_BRIDGE)
 	printf("\t!!! Invalid class %04x for header type %02x\n", class, htype);
+      bist = get_conf_byte(d, PCI_BIST);
       min_gnt = max_lat = 0;
       break;
     default:
       printf("\t!!! Unknown header type %02x\n", htype);
-      return;
+      bist = 0;
+      min_gnt = max_lat = 0;
+      unknown_config_data = 1;
     }
 
   if (p->phy_slot)
@@ -778,8 +844,10 @@ show_verbose(struct device *d)
   if (dt_node = pci_get_string_property(p, PCI_FILL_DT_NODE))
     printf("\tDevice tree node: %s\n", dt_node);
 
-  if (verbose > 1)
+  if (!unknown_config_data && verbose > 1)
     {
+      word cmd = get_conf_word(d, PCI_COMMAND);
+      word status = get_conf_word(d, PCI_STATUS);
       printf("\tControl: I/O%c Mem%c BusMaster%c SpecCycle%c MemWINV%c VGASnoop%c ParErr%c Stepping%c SERR%c FastB2B%c DisINTx%c\n",
 	     FLAG(cmd, PCI_COMMAND_IO),
 	     FLAG(cmd, PCI_COMMAND_MEMORY),
@@ -809,6 +877,8 @@ show_verbose(struct device *d)
 	     FLAG(status, PCI_STATUS_INTx));
       if (cmd & PCI_COMMAND_MASTER)
 	{
+	  byte latency = get_conf_byte(d, PCI_LATENCY_TIMER);
+	  byte cache_line = get_conf_byte(d, PCI_CACHE_LINE_SIZE);
 	  printf("\tLatency: %d", latency);
 	  if (min_gnt || max_lat)
 	    {
@@ -825,16 +895,25 @@ show_verbose(struct device *d)
 	    printf(", Cache Line Size: %d bytes", cache_line * 4);
 	  putchar('\n');
 	}
-      if (int_pin || irq)
+    }
+
+  if (verbose > 1)
+    {
+      byte int_pin = unknown_config_data ? 0 : get_conf_byte(d, PCI_INTERRUPT_PIN);
+      if (int_pin || p->irq)
 	printf("\tInterrupt: pin %c routed to IRQ " PCIIRQ_FMT "\n",
-	       (int_pin ? 'A' + int_pin - 1 : '?'), irq);
+	       (int_pin ? 'A' + int_pin - 1 : '?'), p->irq);
       if (p->numa_node != -1)
 	printf("\tNUMA node: %d\n", p->numa_node);
       if (iommu_group = pci_get_string_property(p, PCI_FILL_IOMMU_GROUP))
 	printf("\tIOMMU group: %s\n", iommu_group);
     }
-  else
+
+  if (!unknown_config_data && verbose <= 1)
     {
+      word cmd = get_conf_word(d, PCI_COMMAND);
+      word status = get_conf_word(d, PCI_STATUS);
+      byte latency = get_conf_byte(d, PCI_LATENCY_TIMER);
       printf("\tFlags: ");
       if (cmd & PCI_COMMAND_MASTER)
 	printf("bus master, ");
@@ -854,8 +933,8 @@ show_verbose(struct device *d)
 	     ((status & PCI_STATUS_DEVSEL_MASK) == PCI_STATUS_DEVSEL_FAST) ? "fast" : "??");
       if (cmd & PCI_COMMAND_MASTER)
 	printf(", latency %d", latency);
-      if (irq)
-	printf(", IRQ " PCIIRQ_FMT, irq);
+      if (p->irq)
+	printf(", IRQ " PCIIRQ_FMT, p->irq);
       if (p->numa_node != -1)
 	printf(", NUMA node %d", p->numa_node);
       if (iommu_group = pci_get_string_property(p, PCI_FILL_IOMMU_GROUP))
@@ -882,6 +961,8 @@ show_verbose(struct device *d)
     case PCI_HEADER_TYPE_CARDBUS:
       show_htype2(d);
       break;
+    default:
+      show_htype_unknown(d);
     }
 }