Add device and drivers fields to settings file

The loader settings file now can specify additional drivers to include, whether
to use those drivers exclusively, and filter/sort the VkPhysicalDevices using
the settings file provided list of deviceUUID's.

This lets the settings file control which drivers and/or devices are reported
by the loader, giving greater control over the runtime behavior of the loader.

Author: charles-lunarg

loader/loader.c

@@ -3257,12 +3257,14 @@ VkResult read_data_files_in_search_paths(const struct loader_instance *inst, enu
 
     switch (manifest_type) {
         case LOADER_DATA_FILE_MANIFEST_DRIVER:
-            override_env = loader_secure_getenv(VK_DRIVER_FILES_ENV_VAR, inst);
-            if (NULL == override_env) {
-                // Not there, so fall back to the old name
-                override_env = loader_secure_getenv(VK_ICD_FILENAMES_ENV_VAR, inst);
+            if (loader_settings_should_use_driver_environment_variables(inst)) {
+                override_env = loader_secure_getenv(VK_DRIVER_FILES_ENV_VAR, inst);
+                if (NULL == override_env) {
+                    // Not there, so fall back to the old name
+                    override_env = loader_secure_getenv(VK_ICD_FILENAMES_ENV_VAR, inst);
+                }
+                additional_env = loader_secure_getenv(VK_ADDITIONAL_DRIVER_FILES_ENV_VAR, inst);
             }
-            additional_env = loader_secure_getenv(VK_ADDITIONAL_DRIVER_FILES_ENV_VAR, inst);
 #if COMMON_UNIX_PLATFORMS
             relative_location = VK_DRIVERS_INFO_RELATIVE_DIR;
 #endif
@@ -3802,18 +3804,26 @@ VkResult loader_icd_scan(const struct loader_instance *inst, struct loader_icd_t
         goto out;
     }
 
-    // Parse the filter environment variables to determine if we have any special behavior
-    res = parse_generic_filter_environment_var(inst, VK_DRIVERS_SELECT_ENV_VAR, &select_filter);
-    if (VK_SUCCESS != res) {
-        goto out;
+    if (loader_settings_should_use_driver_environment_variables(inst)) {
+        // Parse the filter environment variables to determine if we have any special behavior
+        res = parse_generic_filter_environment_var(inst, VK_DRIVERS_SELECT_ENV_VAR, &select_filter);
+        if (VK_SUCCESS != res) {
+            goto out;
+        }
+        res = parse_generic_filter_environment_var(inst, VK_DRIVERS_DISABLE_ENV_VAR, &disable_filter);
+        if (VK_SUCCESS != res) {
+            goto out;
+        }
     }
-    res = parse_generic_filter_environment_var(inst, VK_DRIVERS_DISABLE_ENV_VAR, &disable_filter);
+
+    // Get a list of manifest files for ICDs
+    res = loader_get_data_files(inst, LOADER_DATA_FILE_MANIFEST_DRIVER, NULL, &manifest_files);
     if (VK_SUCCESS != res) {
         goto out;
     }
 
-    // Get a list of manifest files for ICDs
-    res = loader_get_data_files(inst, LOADER_DATA_FILE_MANIFEST_DRIVER, NULL, &manifest_files);
+    // Add any drivers provided by the loader settings file
+    res = loader_settings_get_additional_driver_files(inst, &manifest_files);
     if (VK_SUCCESS != res) {
         goto out;
     }
@@ -6781,28 +6791,113 @@ VKAPI_ATTR VkResult VKAPI_CALL terminator_EnumeratePhysicalDevices(VkInstance in
         goto out;
     }
 
-    uint32_t copy_count = inst->phys_dev_count_term;
-    if (NULL != pPhysicalDevices) {
-        if (copy_count > *pPhysicalDeviceCount) {
-            copy_count = *pPhysicalDeviceCount;
-            loader_log(inst, VULKAN_LOADER_INFO_BIT, 0,
-                       "terminator_EnumeratePhysicalDevices : Trimming device count from %d to %d.", inst->phys_dev_count_term,
-                       copy_count);
-            res = VK_INCOMPLETE;
+    if (inst->settings.settings_active && inst->settings.device_configuration_count > 0) {
+        // Use settings file device_configurations if present
+        if (NULL == pPhysicalDevices) {
+            // take the minimum of the settings configurations count and number of terminators
+            *pPhysicalDeviceCount = (inst->settings.device_configuration_count < inst->phys_dev_count_term)
+                                        ? inst->settings.device_configuration_count
+                                        : inst->phys_dev_count_term;
+        } else {
+            res = loader_apply_settings_device_configurations(inst, pPhysicalDeviceCount, pPhysicalDevices);
         }
+    } else {
+        // Otherwise just copy the physical devices up normally and pass it up the chain
+        uint32_t copy_count = inst->phys_dev_count_term;
+        if (NULL != pPhysicalDevices) {
+            if (copy_count > *pPhysicalDeviceCount) {
+                copy_count = *pPhysicalDeviceCount;
+                loader_log(inst, VULKAN_LOADER_INFO_BIT, 0,
+                           "terminator_EnumeratePhysicalDevices : Trimming device count from %d to %d.", inst->phys_dev_count_term,
+                           copy_count);
+                res = VK_INCOMPLETE;
+            }
 
-        for (uint32_t i = 0; i < copy_count; i++) {
-            pPhysicalDevices[i] = (VkPhysicalDevice)inst->phys_devs_term[i];
+            for (uint32_t i = 0; i < copy_count; i++) {
+                pPhysicalDevices[i] = (VkPhysicalDevice)inst->phys_devs_term[i];
+            }
         }
-    }
 
-    *pPhysicalDeviceCount = copy_count;
+        *pPhysicalDeviceCount = copy_count;
+    }
 
 out:
 
     return res;
 }
 
+// Apply the device_configurations in the settings file to the output VkPhysicalDeviceList.
+// That means looking up each VkPhysicalDevice's deviceUUID, filtering using that, and putting them in the order of
+// device_configurations in the settings file.
+VkResult loader_apply_settings_device_configurations(struct loader_instance *inst, uint32_t *pPhysicalDeviceCount,
+                                                     VkPhysicalDevice *pPhysicalDevices) {
+    bool *pd_supports_11 = loader_stack_alloc(inst->phys_dev_count_term * sizeof(bool));
+    if (NULL == pd_supports_11) {
+        return VK_ERROR_OUT_OF_HOST_MEMORY;
+    }
+    memset(pd_supports_11, 0, inst->phys_dev_count_term * sizeof(bool));
+
+    VkPhysicalDeviceVulkan11Properties *pd_vulkan_11_props =
+        loader_stack_alloc(inst->phys_dev_count_term * sizeof(VkPhysicalDeviceVulkan11Properties));
+    if (NULL == pd_vulkan_11_props) {
+        return VK_ERROR_OUT_OF_HOST_MEMORY;
+    }
+    memset(pd_vulkan_11_props, 0, inst->phys_dev_count_term * sizeof(VkPhysicalDeviceVulkan11Properties));
+
+    for (uint32_t i = 0; i < inst->phys_dev_count_term; i++) {
+        pd_vulkan_11_props[i].sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_VULKAN_1_1_PROPERTIES;
+        VkPhysicalDeviceProperties props = {0};
+
+        inst->phys_devs_term[i]->this_icd_term->dispatch.GetPhysicalDeviceProperties(inst->phys_devs_term[i]->phys_dev, &props);
+        if (props.apiVersion >= VK_API_VERSION_1_1) {
+            pd_supports_11[i] = true;
+            VkPhysicalDeviceProperties2 props2 = {0};
+            props2.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PROPERTIES_2;
+            props2.pNext = (void *)&pd_vulkan_11_props[i];
+
+            inst->phys_devs_term[i]->this_icd_term->dispatch.GetPhysicalDeviceProperties2(inst->phys_devs_term[i]->phys_dev,
+                                                                                          &props2);
+        }
+    }
+
+    // Loop over the setting's device configurations, find each VkPhysicalDevice which matches the deviceUUID given, add to the
+    // pPhysicalDevices output list.
+    uint32_t written_output_index = 0;
+
+    for (uint32_t i = 0; i < inst->settings.device_configuration_count; i++) {
+        uint8_t *current_deviceUUID = inst->settings.device_configurations[i].deviceUUID;
+        bool configuration_found = false;
+        for (uint32_t j = 0; j < inst->phys_dev_count_term; j++) {
+            // Don't compare deviceUUID's if they have nothing, since we require deviceUUID's to effectively sort them.
+            if (!pd_supports_11[j]) {
+                continue;
+            }
+            if (memcmp(current_deviceUUID, pd_vulkan_11_props[j].deviceUUID, sizeof(uint8_t) * VK_UUID_SIZE) == 0) {
+                configuration_found = true;
+                // Catch when there are more device_configurations than space available in the output
+                if (written_output_index >= *pPhysicalDeviceCount) {
+                    *pPhysicalDeviceCount = written_output_index;  // write out how many were written
+                    return VK_INCOMPLETE;
+                }
+                pPhysicalDevices[written_output_index++] = (VkPhysicalDevice)inst->phys_devs_term[j];
+                break;
+            }
+        }
+        if (!configuration_found) {
+            uint8_t *id = current_deviceUUID;
+            // Log that this configuration was missing.
+            loader_log(inst, VULKAN_LOADER_WARN_BIT, 0,
+                       "loader_apply_settings_device_configurations: settings file contained device_configuration which does not "
+                       "appear in the list of enumerated VkPhysicalDevices. Missing device_configuration's deviceUUID: "
+                       "[%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d]",
+                       id[0], id[1], id[2], id[3], id[4], id[5], id[6], id[7], id[8], id[9], id[10], id[11], id[12], id[13], id[14],
+                       id[15]);
+        }
+    }
+    *pPhysicalDeviceCount = written_output_index;  // update with how many were written
+    return VK_SUCCESS;
+}
+
 VKAPI_ATTR VkResult VKAPI_CALL terminator_EnumerateDeviceExtensionProperties(VkPhysicalDevice physicalDevice,
                                                                              const char *pLayerName, uint32_t *pPropertyCount,
                                                                              VkExtensionProperties *pProperties) {

loader/loader.h

@@ -221,6 +221,9 @@ VkResult setup_loader_tramp_phys_dev_groups(struct loader_instance *inst, uint32
                                             VkPhysicalDeviceGroupProperties *groups);
 void unload_drivers_without_physical_devices(struct loader_instance *inst);
 
+VkResult loader_apply_settings_device_configurations(struct loader_instance *inst, uint32_t *pPhysicalDeviceCount,
+                                                     VkPhysicalDevice *pPhysicalDevices);
+
 VkStringErrorFlags vk_string_validate(const int max_length, const char *char_array);
 char *loader_get_next_path(char *path);
 VkResult add_if_manifest_file(const struct loader_instance *inst, const char *file_name, struct loader_string_list *out_files);