drm/amdgpu/acpi: make ATPX/ATCS structures global (v2)

They are global ACPI methods, so maybe the structures
global in the driver. This simplified a number of things
in the handling of these methods.

v2: reset the handle if verify interface fails (Lijo)
v3: fix compilation when ACPI is not defined.
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -268,8 +268,6 @@ struct amdgpu_job;
 struct amdgpu_irq_src;
 struct amdgpu_fpriv;
 struct amdgpu_bo_va_mapping;
-struct amdgpu_atif;
-struct amdgpu_atcs;
 struct kfd_vm_fault_info;
 struct amdgpu_hive_info;
 struct amdgpu_reset_context;
@@ -812,8 +810,6 @@ struct amdgpu_device {
 	struct notifier_block		acpi_nb;
 	struct amdgpu_i2c_chan		*i2c_bus[AMDGPU_MAX_I2C_BUS];
 	struct debugfs_blob_wrapper     debugfs_vbios_blob;
-	struct amdgpu_atif		*atif;
-	struct amdgpu_atcs		*atcs;
 	struct mutex			srbm_mutex;
 	/* GRBM index mutex. Protects concurrent access to GRBM index */
 	struct mutex                    grbm_idx_mutex;
@@ -1348,13 +1344,14 @@ int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
 						u8 perf_req, bool advertise);
 int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev);
 
-void amdgpu_acpi_get_backlight_caps(struct amdgpu_device *adev,
-		struct amdgpu_dm_backlight_caps *caps);
+void amdgpu_acpi_get_backlight_caps(struct amdgpu_dm_backlight_caps *caps);
 bool amdgpu_acpi_is_s0ix_supported(struct amdgpu_device *adev);
+void amdgpu_acpi_detect(void);
 #else
 static inline int amdgpu_acpi_init(struct amdgpu_device *adev) { return 0; }
 static inline void amdgpu_acpi_fini(struct amdgpu_device *adev) { }
 static inline bool amdgpu_acpi_is_s0ix_supported(struct amdgpu_device *adev) { return false; }
+static inline void amdgpu_acpi_detect(void) { }
 #endif
 
 int amdgpu_cs_find_mapping(struct amdgpu_cs_parser *parser,

drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c

@@ -84,6 +84,11 @@ struct amdgpu_atcs {
 	struct amdgpu_atcs_functions functions;
 };
 
+static struct amdgpu_acpi_priv {
+	struct amdgpu_atif atif;
+	struct amdgpu_atcs atcs;
+} amdgpu_acpi_priv;
+
 /* Call the ATIF method
  */
 /**
@@ -220,62 +225,6 @@ static int amdgpu_atif_verify_interface(struct amdgpu_atif *atif)
 	return err;
 }
 
-static acpi_handle amdgpu_atif_probe_handle(acpi_handle dhandle)
-{
-	acpi_handle handle = NULL;
-	char acpi_method_name[255] = { 0 };
-	struct acpi_buffer buffer = { sizeof(acpi_method_name), acpi_method_name };
-	acpi_status status;
-
-	/* For PX/HG systems, ATIF and ATPX are in the iGPU's namespace, on dGPU only
-	 * systems, ATIF is in the dGPU's namespace.
-	 */
-	if (amdgpu_has_atpx()) {
-		status = acpi_get_handle(amdgpu_atpx_get_dhandle(), "ATIF",
-					 &handle);
-		if (ACPI_SUCCESS(status))
-			goto out;
-	}
-	status = acpi_get_handle(dhandle, "ATIF", &handle);
-	if (ACPI_SUCCESS(status))
-		goto out;
-
-	DRM_DEBUG_DRIVER("No ATIF handle found\n");
-	return NULL;
-out:
-	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
-	DRM_DEBUG_DRIVER("Found ATIF handle %s\n", acpi_method_name);
-	return handle;
-}
-
-static acpi_handle amdgpu_atcs_probe_handle(acpi_handle dhandle)
-{
-	acpi_handle handle = NULL;
-	char acpi_method_name[255] = { 0 };
-	struct acpi_buffer buffer = { sizeof(acpi_method_name), acpi_method_name };
-	acpi_status status;
-
-	/* For PX/HG systems, ATCS and ATPX are in the iGPU's namespace, on dGPU only
-	 * systems, ATIF is in the dGPU's namespace.
-	 */
-	if (amdgpu_has_atpx()) {
-		status = acpi_get_handle(amdgpu_atpx_get_dhandle(), "ATCS",
-					 &handle);
-		if (ACPI_SUCCESS(status))
-			goto out;
-	}
-	status = acpi_get_handle(dhandle, "ATCS", &handle);
-	if (ACPI_SUCCESS(status))
-		goto out;
-
-	DRM_DEBUG_DRIVER("No ATCS handle found\n");
-	return NULL;
-out:
-	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
-	DRM_DEBUG_DRIVER("Found ATCS handle %s\n", acpi_method_name);
-	return handle;
-}
-
 /**
  * amdgpu_atif_get_notification_params - determine notify configuration
  *
@@ -454,7 +403,7 @@ static int amdgpu_atif_get_sbios_requests(struct amdgpu_atif *atif,
 static int amdgpu_atif_handler(struct amdgpu_device *adev,
 			       struct acpi_bus_event *event)
 {
-	struct amdgpu_atif *atif = adev->atif;
+	struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
 	int count;
 
 	DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
@@ -464,8 +413,7 @@ static int amdgpu_atif_handler(struct amdgpu_device *adev,
 		return NOTIFY_DONE;
 
 	/* Is this actually our event? */
-	if (!atif ||
-	    !atif->notification_cfg.enabled ||
+	if (!atif->notification_cfg.enabled ||
 	    event->type != atif->notification_cfg.command_code) {
 		/* These events will generate keypresses otherwise */
 		if (event->type == ACPI_VIDEO_NOTIFY_PROBE)
@@ -642,10 +590,8 @@ static int amdgpu_atcs_verify_interface(struct amdgpu_atcs *atcs)
  */
 bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev)
 {
-	struct amdgpu_atcs *atcs = adev->atcs;
+	struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
 
-	if (!atcs)
-		return false;
 	if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
 		return true;
 
@@ -664,10 +610,8 @@ bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *ade
 int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev)
 {
 	union acpi_object *info;
-	struct amdgpu_atcs *atcs = adev->atcs;
+	struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
 
-	if (!atcs)
-		return -EINVAL;
 	if (!atcs->functions.pcie_dev_rdy)
 		return -EINVAL;
 
@@ -695,16 +639,13 @@ int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
 					 u8 perf_req, bool advertise)
 {
 	union acpi_object *info;
-	struct amdgpu_atcs *atcs = adev->atcs;
+	struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
 	struct atcs_pref_req_input atcs_input;
 	struct atcs_pref_req_output atcs_output;
 	struct acpi_buffer params;
 	size_t size;
 	u32 retry = 3;
 
-	if (!atcs)
-		return -EINVAL;
-
 	if (amdgpu_acpi_pcie_notify_device_ready(adev))
 		return -EINVAL;
 
@@ -801,37 +742,7 @@ static int amdgpu_acpi_event(struct notifier_block *nb,
  */
 int amdgpu_acpi_init(struct amdgpu_device *adev)
 {
-	acpi_handle handle, atif_handle, atcs_handle;
-	struct amdgpu_atif *atif;
-	struct amdgpu_atcs *atcs;
-	int ret = 0;
-
-	/* Get the device handle */
-	handle = ACPI_HANDLE(&adev->pdev->dev);
-
-	if (!adev->bios || !handle)
-		return ret;
-
-	/* Probe for ATIF, and initialize it if found */
-	atif_handle = amdgpu_atif_probe_handle(handle);
-	if (!atif_handle)
-		goto atcs;
-
-	atif = kzalloc(sizeof(*atif), GFP_KERNEL);
-	if (!atif) {
-		DRM_WARN("Not enough memory to initialize ATIF\n");
-		goto atcs;
-	}
-	atif->handle = atif_handle;
-
-	/* Call the ATIF method */
-	ret = amdgpu_atif_verify_interface(atif);
-	if (ret) {
-		DRM_DEBUG_DRIVER("Call to ATIF verify_interface failed: %d\n", ret);
-		kfree(atif);
-		goto atcs;
-	}
-	adev->atif = atif;
+	struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
 
 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
 	if (atif->notifications.brightness_change) {
@@ -861,6 +772,129 @@ int amdgpu_acpi_init(struct amdgpu_device *adev)
 		}
 	}
 #endif
+	adev->acpi_nb.notifier_call = amdgpu_acpi_event;
+	register_acpi_notifier(&adev->acpi_nb);
+
+	return 0;
+}
+
+void amdgpu_acpi_get_backlight_caps(struct amdgpu_dm_backlight_caps *caps)
+{
+	struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
+
+	caps->caps_valid = atif->backlight_caps.caps_valid;
+	caps->min_input_signal = atif->backlight_caps.min_input_signal;
+	caps->max_input_signal = atif->backlight_caps.max_input_signal;
+}
+
+/**
+ * amdgpu_acpi_fini - tear down driver acpi support
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Unregisters with the acpi notifier chain (all asics).
+ */
+void amdgpu_acpi_fini(struct amdgpu_device *adev)
+{
+	unregister_acpi_notifier(&adev->acpi_nb);
+}
+
+/**
+ * amdgpu_atif_pci_probe_handle - look up the ATIF handle
+ *
+ * @pdev: pci device
+ *
+ * Look up the ATIF handles (all asics).
+ * Returns true if the handle is found, false if not.
+ */
+static bool amdgpu_atif_pci_probe_handle(struct pci_dev *pdev)
+{
+	char acpi_method_name[255] = { 0 };
+	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
+	acpi_handle dhandle, atif_handle;
+	acpi_status status;
+	int ret;
+
+	dhandle = ACPI_HANDLE(&pdev->dev);
+	if (!dhandle)
+		return false;
+
+	status = acpi_get_handle(dhandle, "ATIF", &atif_handle);
+	if (ACPI_FAILURE(status)) {
+		return false;
+	}
+	amdgpu_acpi_priv.atif.handle = atif_handle;
+	acpi_get_name(amdgpu_acpi_priv.atif.handle, ACPI_FULL_PATHNAME, &buffer);
+	DRM_DEBUG_DRIVER("Found ATIF handle %s\n", acpi_method_name);
+	ret = amdgpu_atif_verify_interface(&amdgpu_acpi_priv.atif);
+	if (ret) {
+		amdgpu_acpi_priv.atif.handle = 0;
+		return false;
+	}
+	return true;
+}
+
+/**
+ * amdgpu_atcs_pci_probe_handle - look up the ATCS handle
+ *
+ * @pdev: pci device
+ *
+ * Look up the ATCS handles (all asics).
+ * Returns true if the handle is found, false if not.
+ */
+static bool amdgpu_atcs_pci_probe_handle(struct pci_dev *pdev)
+{
+	char acpi_method_name[255] = { 0 };
+	struct acpi_buffer buffer = { sizeof(acpi_method_name), acpi_method_name };
+	acpi_handle dhandle, atcs_handle;
+	acpi_status status;
+	int ret;
+
+	dhandle = ACPI_HANDLE(&pdev->dev);
+	if (!dhandle)
+		return false;
+
+	status = acpi_get_handle(dhandle, "ATCS", &atcs_handle);
+	if (ACPI_FAILURE(status)) {
+		return false;
+	}
+	amdgpu_acpi_priv.atcs.handle = atcs_handle;
+	acpi_get_name(amdgpu_acpi_priv.atcs.handle, ACPI_FULL_PATHNAME, &buffer);
+	DRM_DEBUG_DRIVER("Found ATCS handle %s\n", acpi_method_name);
+	ret = amdgpu_atcs_verify_interface(&amdgpu_acpi_priv.atcs);
+	if (ret) {
+		amdgpu_acpi_priv.atcs.handle = 0;
+		return false;
+	}
+	return true;
+}
+
+/*
+ * amdgpu_acpi_detect - detect ACPI ATIF/ATCS methods
+ *
+ * Check if we have the ATIF/ATCS methods and populate
+ * the structures in the driver.
+ */
+void amdgpu_acpi_detect(void)
+{
+	struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
+	struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
+	struct pci_dev *pdev = NULL;
+	int ret;
+
+	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
+		if (!atif->handle)
+			amdgpu_atif_pci_probe_handle(pdev);
+		if (!atcs->handle)
+			amdgpu_atcs_pci_probe_handle(pdev);
+	}
+
+	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
+		if (!atif->handle)
+			amdgpu_atif_pci_probe_handle(pdev);
+		if (!atcs->handle)
+			amdgpu_atcs_pci_probe_handle(pdev);
+	}
 
 	if (atif->functions.sbios_requests && !atif->functions.system_params) {
 		/* XXX check this workraround, if sbios request function is
@@ -890,60 +924,6 @@ int amdgpu_acpi_init(struct amdgpu_device *adev)
 	} else {
 		atif->backlight_caps.caps_valid = false;
 	}
-
-atcs:
-	/* Probe for ATCS, and initialize it if found */
-	atcs_handle = amdgpu_atcs_probe_handle(handle);
-	if (!atcs_handle)
-		goto out;
-
-	atcs = kzalloc(sizeof(*atcs), GFP_KERNEL);
-	if (!atcs) {
-		DRM_WARN("Not enough memory to initialize ATCS\n");
-		goto out;
-	}
-	atcs->handle = atcs_handle;
-
-	/* Call the ATCS method */
-	ret = amdgpu_atcs_verify_interface(atcs);
-	if (ret) {
-		DRM_DEBUG_DRIVER("Call to ATCS verify_interface failed: %d\n", ret);
-		kfree(atcs);
-		goto out;
-	}
-	adev->atcs = atcs;
-
-out:
-	adev->acpi_nb.notifier_call = amdgpu_acpi_event;
-	register_acpi_notifier(&adev->acpi_nb);
-
-	return ret;
-}
-
-void amdgpu_acpi_get_backlight_caps(struct amdgpu_device *adev,
-		struct amdgpu_dm_backlight_caps *caps)
-{
-	if (!adev->atif) {
-		caps->caps_valid = false;
-		return;
-	}
-	caps->caps_valid = adev->atif->backlight_caps.caps_valid;
-	caps->min_input_signal = adev->atif->backlight_caps.min_input_signal;
-	caps->max_input_signal = adev->atif->backlight_caps.max_input_signal;
-}
-
-/**
- * amdgpu_acpi_fini - tear down driver acpi support
- *
- * @adev: amdgpu_device pointer
- *
- * Unregisters with the acpi notifier chain (all asics).
- */
-void amdgpu_acpi_fini(struct amdgpu_device *adev)
-{
-	unregister_acpi_notifier(&adev->acpi_nb);
-	kfree(adev->atif);
-	kfree(adev->atcs);
 }
 
 /**

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

@@ -1801,6 +1801,7 @@ static int __init amdgpu_init(void)
 
 	DRM_INFO("amdgpu kernel modesetting enabled.\n");
 	amdgpu_register_atpx_handler();
+	amdgpu_acpi_detect();
 
 	/* Ignore KFD init failures. Normal when CONFIG_HSA_AMD is not set. */
 	amdgpu_amdkfd_init();

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -3415,7 +3415,7 @@ static void amdgpu_dm_update_backlight_caps(struct amdgpu_display_manager *dm)
 	if (dm->backlight_caps.caps_valid)
 		return;
 
-	amdgpu_acpi_get_backlight_caps(dm->adev, &caps);
+	amdgpu_acpi_get_backlight_caps(&caps);
 	if (caps.caps_valid) {
 		dm->backlight_caps.caps_valid = true;
 		if (caps.aux_support)