WIP

src/arm/soc.c

@@ -1044,6 +1044,62 @@ struct system_on_chip* guess_soc_from_devtree(struct system_on_chip* soc) {
   DT_END(dt, len)
 }
 
+// This function is different from the rest guess_soc_from_xxx, which try infering
+// the exact SoC model by matching some string against a list of known values.
+// On the other hand, this function will just try to infer the SoC vendor first by
+// matching the device tree vendor name (i.e., the first value, before the comma).
+// If that is successfull, then it also fills in the SoC name using the string from
+// the device tree.
+// The critical difference is that this function does not need a LUT to fill in the
+// SoC, it just needs to find a known vendor. On the other hand, the detection is
+// less powerful since we cannot get the manufacturing process, and the SoC name will
+// come directly from the device tree, meaning that it will likely be less precise.
+struct system_on_chip* guess_raw_soc_from_devtree(struct system_on_chip* soc) {
+  int num_vendors;
+  struct devtree** dt_vendors = get_devtree_compatible_struct(&num_vendors);
+  if (dt_vendors == NULL) {
+    return soc;
+  }
+
+  typedef struct {
+    char* compatible;
+    VENDOR soc_vendor;
+  } devtreeToVendor;
+
+  // https://elixir.bootlin.com/linux/v6.10.6/source/arch/arm64/boot/dts
+  // grep -oR --color -E 'compatible = ".*"' <soc_vendor> | cut -d '=' -f2 | cut -d ',' -f1 | tr -d '"' | sort | uniq -c | sort
+  // - The following vendors are not included because they dont seem to be present in dts:
+  // SOC_VENDOR_(KIRIN, KUNPENG, GOOGLE, AMPERE).
+  // - The commented vendors are not included intentionally, because I prefer updating its LUT manually.
+  devtreeToVendor socFromDevtree[] = {
+    // {"qcom",       SOC_VENDOR_SNAPDRAGON},
+    // {"samsung",    SOC_VENDOR_EXYNOS},
+    // {"brcm",       SOC_VENDOR_BROADCOM},
+    // {"apple",      SOC_VENDOR_APPLE},
+    // {"rockchip",   SOC_VENDOR_ROCKCHIP},
+    // {"nvidia",     SOC_VENDOR_NVIDIA},
+    {"mediatek",   SOC_VENDOR_MEDIATEK},
+    {"fsl",        SOC_VENDOR_NXP     },
+    {"nxp",        SOC_VENDOR_NXP     },
+    {"amlogic",    SOC_VENDOR_AMLOGIC },
+    {"marvell",    SOC_VENDOR_MARVELL },
+    {NULL,         SOC_VENDOR_UNKNOWN }
+  };
+
+  int index = 0;
+  while (socFromDevtree[index].compatible != 0x0) {
+    for (int i=0; i < num_vendors; i++) {
+      if (strcmp(socFromDevtree[index].compatible, dt_vendors[i]->vendor) == 0) {
+        fill_soc_raw(soc, dt_vendors[i]->model, socFromDevtree[index].soc_vendor);
+      }
+    }
+    index++;
+  }
+
+  printWarn("guess_raw_soc_from_devtree: No device matched the list");
+  return soc;
+}
+
 struct system_on_chip* guess_soc_from_pci(struct system_on_chip* soc, struct cpuInfo* cpu) {
   struct pci_devices * pci = get_pci_devices();
   if (pci == NULL) {
@@ -1270,6 +1326,11 @@ struct system_on_chip* get_soc(struct cpuInfo* cpu) {
     if(soc->vendor == SOC_VENDOR_UNKNOWN) {
       soc = guess_soc_from_pci(soc, cpu);
     }
+    if (soc->vendor == SOC_VENDOR_UNKNOWN) {
+      // If we fall here it means all previous functions failed to detect the SoC.
+      // In such case, try with our last resort. If it also fails, we will just give up
+      soc = guess_raw_soc_from_devtree(soc);
+    }
   }
 #elif defined __APPLE__ || __MACH__
   soc = guess_soc_apple(soc);
@@ -1295,16 +1356,13 @@ struct system_on_chip* get_soc(struct cpuInfo* cpu) {
   soc->vendor = try_match_soc_vendor_name(processor_name_string);
   soc->model = SOC_MODEL_UNKNOWN;
   soc->process = UNKNOWN;
-
 #else
-
   if(soc->model == SOC_MODEL_UNKNOWN) {
     // raw_name might not be NULL, but if we were unable to find
     // the exact SoC, just print "Unkwnown"
     soc->raw_name = emalloc(sizeof(char) * (strlen(STRING_UNKNOWN)+1));
     snprintf(soc->raw_name, strlen(STRING_UNKNOWN)+1, STRING_UNKNOWN);
   }
-
 #endif 
 
   return soc;

src/common/soc.c

@@ -79,6 +79,16 @@ void fill_soc(struct system_on_chip* soc, char* soc_name, SOC soc_model, int32_t
   }
 }
 
+void fill_soc_raw(struct system_on_chip* soc, char* soc_name, VENDOR vendor) {
+  soc->model = SOC_MODEL_UNKNOWN;
+  soc->vendor = vendor;
+  soc->process = UNKNOWN;
+
+  int len = strlen(soc_name) + strlen(soc_trademark_string[soc->vendor]) + 1;
+  soc->name = emalloc(sizeof(char) * len);
+  sprintf(soc->name, "%s%s", soc_trademark_string[soc->vendor], soc_name);
+}
+
 #ifdef _WIN32
 VENDOR try_match_soc_vendor_name(char* vendor_name)
 {

src/common/soc.h

@@ -51,6 +51,7 @@ VENDOR get_soc_vendor(struct system_on_chip* soc);
 bool match_soc(struct system_on_chip* soc, char* raw_name, char* expected_name, char* soc_name, SOC soc_model, int32_t process);
 char* get_str_process(struct system_on_chip* soc);
 void fill_soc(struct system_on_chip* soc, char* soc_name, SOC soc_model, int32_t process);
+void fill_soc_raw(struct system_on_chip* soc, char* soc_name, VENDOR vendor);
 #ifdef _WIN32
 VENDOR try_match_soc_vendor_name(char* vendor_name);
 #endif

src/common/udev.c

@@ -361,3 +361,49 @@ char* get_devtree_compatible(int *filelen) {
 
   return buf;
 }
+
+// TODO:
+// Returns a list of strings containing the vendors of the compatible
+// file from the device tree. In this context, vendor refers to the first
+// string of every entry. For instance, given a compatible file with:
+// "str1,foo1.str2,foo2" (where . denotes the NULL byte, i.e., the separator),
+// then this function will return a list with str1,str2.
+struct devtree** get_devtree_compatible_struct(int *num_vendors_ptr) {
+  int len;
+  char* dt = get_devtree_compatible(&len);
+  if (dt == NULL) {
+    return NULL;
+  }
+
+  int num_vendors = 0;
+  char* ptr = dt;
+
+  for (int ptrpos = 0; ptrpos < len; ptrpos = (ptr-dt)) {
+    ptr = memchr(ptr, '\0', len)+1;
+    num_vendors++;
+  }
+
+  struct devtree** vendors = emalloc(sizeof(struct devtree *) * num_vendors);
+  ptr = dt;
+
+  for (int ptrpos = 0, i = 0; ptrpos < len; ptrpos = (ptr-dt), i++) {
+    char* comma_ptr = strstr(ptr, ",")-1;
+    char* end_ptr = memchr(comma_ptr, '\0', ptrpos - len);
+
+    // TODO check NULL
+    int vendor_str_len = (comma_ptr-ptr)+1;
+    int model_str_len = (end_ptr-comma_ptr)+1;
+
+    vendors[i] = emalloc(sizeof(struct devtree));
+    vendors[i]->vendor = ecalloc(vendor_str_len, sizeof(char));
+    vendors[i]->model = ecalloc(model_str_len, sizeof(char));
+
+    strncpy(vendors[i]->vendor, ptr, vendor_str_len);
+    strncpy(vendors[i]->model, comma_ptr, model_str_len);
+
+    ptr = memchr(ptr, '\0', len)+1;
+  }
+
+  *num_vendors_ptr = num_vendors;
+  return vendors;
+}

src/common/udev.h

@@ -31,6 +31,11 @@
 #define _PATH_CACHE_MAX_LEN     200
 #define _PATH_PACKAGE_MAX_LEN   200
 
+struct devtree {
+  char* vendor;
+  char* model;
+};
+
 char* read_file(char* path, int* len);
 long get_max_freq_from_file(uint32_t core);
 long get_min_freq_from_file(uint32_t core);
@@ -44,5 +49,6 @@ int get_ncores_from_cpuinfo(void);
 char* get_field_from_cpuinfo(char* CPUINFO_FIELD);
 bool is_devtree_compatible(char* str);
 char* get_devtree_compatible(int *filelen);
+struct devtree** get_devtree_compatible_struct(int *num_vendors);
 
 #endif