pcie_check: will not show unavailable PCI or PCIe info in the list

Add the judgment that PCI capability is 0, it will not show unavailable PCI
or PCIe info in the list.

Reported-by: Yi Lai <[email protected]>
Signed-off-by: Pengfei Xu <[email protected]>

BM/tools/pcie/pcie_check.c

@@ -411,8 +411,9 @@ int recognize_pcie(u32 *ptrdata)
 	/* 0x34/4 is capability pointer in PCI */
 	nextpoint = (u8)(*(ptrdata + PCI_CAP_START / 4));
 
+	/* If 0x34 next point is 0, will continue and code is 3 */
 	if (nextpoint == 0)
-		return 0;
+		return 3;
 
 	ptrsearch = ptrdata + nextpoint / 4;
 	while (1) {
@@ -511,7 +512,7 @@ int scan_pci(void)
 	u32 bus, dev, fun;
 	// Must 32bit for data check!
 	u32 *ptrdata = malloc(sizeof(unsigned long) * 4096);
-	int fd;
+	int fd, ret;
 
 	fd = open("/dev/mem", O_RDWR);
 
@@ -537,14 +538,17 @@ int scan_pci(void)
 				}
 
 				if ((*ptrdata != ptr_content) && (*ptrdata != 0)) {
-					if (recognize_pcie(ptrdata) == 2) {
+					ret = recognize_pcie(ptrdata);
+					if (ret == 2) {
 						printf("[ERROR] PCI %02x:%02x.%x offset 0xff,",
 						       bus, dev, fun);
 						printf("please debug:pcie_check a %x %x %x\n",
 						       bus, dev, fun);
 						munmap(ptrdata, LEN_SIZE);
 						close(fd);
 						return 2;
+					} else if (ret == 3) {
+						continue;
 					}
 
 					if (is_pcie == 0)
@@ -589,6 +593,9 @@ int specific_pcie_cap(u32 *ptrdata, u16 cap)
 		 *	PCI_CAP_START, ptrdata, *ptrdata);
 		 */
 		return 2;
+	/* If 0x34 next point is 0, will continue and code is 3 */
+	} else if (nextpoint == 0) {
+		return 3;
 	}
 
 	cap_value = (u16)(*(ptrdata + next / 4));
@@ -797,6 +804,8 @@ int find_pcie_reg(u16 cap, u32 offset, u32 size)
 						printf("please debug:pcie_check a %x %x %x\n",
 						       bus, dev, func);
 						continue;
+					} else if (result == 3) {
+						continue;
 					}
 				}
 				munmap(ptrdata, LEN_SIZE);
@@ -971,6 +980,8 @@ int find_pci_reg(u16 cap, u32 offset, u32 size)
 						printf("please debug:pcie_check a %x %x %x\n",
 						       bus, dev, func);
 						continue;
+					} else if (result == 3) {
+						continue;
 					}
 				}
 				munmap(ptrdata, LEN_SIZE);