1 files changed, 304 insertions, 0 deletions

diff --git a/drivers/platform/x86/amd/pmf/acpi.c b/drivers/platform/x86/amd/pmf/acpi.c
new file mode 100644
index 000000000000..081e84e116e7
--- /dev/null
+++ b/drivers/platform/x86/amd/pmf/acpi.c
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AMD Platform Management Framework Driver
+ *
+ * Copyright (c) 2022, Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
+ */
+
+#include <linux/acpi.h>
+#include "pmf.h"
+
+#define APMF_CQL_NOTIFICATION  2
+#define APMF_AMT_NOTIFICATION  3
+
+static union acpi_object *apmf_if_call(struct amd_pmf_dev *pdev, int fn, struct acpi_buffer *param)
+{
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	acpi_handle ahandle = ACPI_HANDLE(pdev->dev);
+	struct acpi_object_list apmf_if_arg_list;
+	union acpi_object apmf_if_args[2];
+	acpi_status status;
+
+	apmf_if_arg_list.count = 2;
+	apmf_if_arg_list.pointer = &apmf_if_args[0];
+
+	apmf_if_args[0].type = ACPI_TYPE_INTEGER;
+	apmf_if_args[0].integer.value = fn;
+
+	if (param) {
+		apmf_if_args[1].type = ACPI_TYPE_BUFFER;
+		apmf_if_args[1].buffer.length = param->length;
+		apmf_if_args[1].buffer.pointer = param->pointer;
+	} else {
+		apmf_if_args[1].type = ACPI_TYPE_INTEGER;
+		apmf_if_args[1].integer.value = 0;
+	}
+
+	status = acpi_evaluate_object(ahandle, "APMF", &apmf_if_arg_list, &buffer);
+	if (ACPI_FAILURE(status)) {
+		dev_err(pdev->dev, "APMF method:%d call failed\n", fn);
+		kfree(buffer.pointer);
+		return NULL;
+	}
+
+	return buffer.pointer;
+}
+
+static int apmf_if_call_store_buffer(struct amd_pmf_dev *pdev, int fn, void *dest, size_t out_sz)
+{
+	union acpi_object *info;
+	size_t size;
+	int err = 0;
+
+	info = apmf_if_call(pdev, fn, NULL);
+	if (!info)
+		return -EIO;
+
+	if (info->type != ACPI_TYPE_BUFFER) {
+		dev_err(pdev->dev, "object is not a buffer\n");
+		err = -EINVAL;
+		goto out;
+	}
+
+	if (info->buffer.length < 2) {
+		dev_err(pdev->dev, "buffer too small\n");
+		err = -EINVAL;
+		goto out;
+	}
+
+	size = *(u16 *)info->buffer.pointer;
+	if (info->buffer.length < size) {
+		dev_err(pdev->dev, "buffer smaller then headersize %u < %zu\n",
+			info->buffer.length, size);
+		err = -EINVAL;
+		goto out;
+	}
+
+	if (size < out_sz) {
+		dev_err(pdev->dev, "buffer too small %zu\n", size);
+		err = -EINVAL;
+		goto out;
+	}
+
+	memcpy(dest, info->buffer.pointer, out_sz);
+
+out:
+	kfree(info);
+	return err;
+}
+
+int is_apmf_func_supported(struct amd_pmf_dev *pdev, unsigned long index)
+{
+	/* If bit-n is set, that indicates function n+1 is supported */
+	return !!(pdev->supported_func & BIT(index - 1));
+}
+
+int apmf_get_static_slider_granular(struct amd_pmf_dev *pdev,
+				    struct apmf_static_slider_granular_output *data)
+{
+	if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
+		return -EINVAL;
+
+	return apmf_if_call_store_buffer(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR,
+									 data, sizeof(*data));
+}
+
+static void apmf_sbios_heartbeat_notify(struct work_struct *work)
+{
+	struct amd_pmf_dev *dev = container_of(work, struct amd_pmf_dev, heart_beat.work);
+	union acpi_object *info;
+
+	dev_dbg(dev->dev, "Sending heartbeat to SBIOS\n");
+	info = apmf_if_call(dev, APMF_FUNC_SBIOS_HEARTBEAT, NULL);
+	if (!info)
+		goto out;
+
+	schedule_delayed_work(&dev->heart_beat, msecs_to_jiffies(dev->hb_interval * 1000));
+
+out:
+	kfree(info);
+}
+
+int apmf_update_fan_idx(struct amd_pmf_dev *pdev, bool manual, u32 idx)
+{
+	union acpi_object *info;
+	struct apmf_fan_idx args;
+	struct acpi_buffer params;
+	int err = 0;
+
+	args.size = sizeof(args);
+	args.fan_ctl_mode = manual;
+	args.fan_ctl_idx = idx;
+
+	params.length = sizeof(args);
+	params.pointer = (void *)&args;
+
+	info = apmf_if_call(pdev, APMF_FUNC_SET_FAN_IDX, &params);
+	if (!info) {
+		err = -EIO;
+		goto out;
+	}
+
+out:
+	kfree(info);
+	return err;
+}
+
+int apmf_get_auto_mode_def(struct amd_pmf_dev *pdev, struct apmf_auto_mode *data)
+{
+	return apmf_if_call_store_buffer(pdev, APMF_FUNC_AUTO_MODE, data, sizeof(*data));
+}
+
+int apmf_get_sbios_requests(struct amd_pmf_dev *pdev, struct apmf_sbios_req *req)
+{
+	return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS,
+									 req, sizeof(*req));
+}
+
+static void apmf_event_handler(acpi_handle handle, u32 event, void *data)
+{
+	struct amd_pmf_dev *pmf_dev = data;
+	struct apmf_sbios_req req;
+	int ret;
+
+	mutex_lock(&pmf_dev->update_mutex);
+	ret = apmf_get_sbios_requests(pmf_dev, &req);
+	if (ret) {
+		dev_err(pmf_dev->dev, "Failed to get SBIOS requests:%d\n", ret);
+		goto out;
+	}
+
+	if (req.pending_req & BIT(APMF_AMT_NOTIFICATION)) {
+		dev_dbg(pmf_dev->dev, "AMT is supported and notifications %s\n",
+			req.amt_event ? "Enabled" : "Disabled");
+		pmf_dev->amt_enabled = !!req.amt_event;
+
+		if (pmf_dev->amt_enabled)
+			amd_pmf_handle_amt(pmf_dev);
+		else
+			amd_pmf_reset_amt(pmf_dev);
+	}
+
+	if (req.pending_req & BIT(APMF_CQL_NOTIFICATION)) {
+		dev_dbg(pmf_dev->dev, "CQL is supported and notifications %s\n",
+			req.cql_event ? "Enabled" : "Disabled");
+
+		/* update the target mode information */
+		if (pmf_dev->amt_enabled)
+			amd_pmf_update_2_cql(pmf_dev, req.cql_event);
+	}
+out:
+	mutex_unlock(&pmf_dev->update_mutex);
+}
+
+static int apmf_if_verify_interface(struct amd_pmf_dev *pdev)
+{
+	struct apmf_verify_interface output;
+	int err;
+
+	err = apmf_if_call_store_buffer(pdev, APMF_FUNC_VERIFY_INTERFACE, &output, sizeof(output));
+	if (err)
+		return err;
+
+	pdev->supported_func = output.supported_functions;
+	dev_dbg(pdev->dev, "supported functions:0x%x notifications:0x%x\n",
+		output.supported_functions, output.notification_mask);
+
+	return 0;
+}
+
+static int apmf_get_system_params(struct amd_pmf_dev *dev)
+{
+	struct apmf_system_params params;
+	int err;
+
+	if (!is_apmf_func_supported(dev, APMF_FUNC_GET_SYS_PARAMS))
+		return -EINVAL;
+
+	err = apmf_if_call_store_buffer(dev, APMF_FUNC_GET_SYS_PARAMS, &params, sizeof(params));
+	if (err)
+		return err;
+
+	dev_dbg(dev->dev, "system params mask:0x%x flags:0x%x cmd_code:0x%x heartbeat:%d\n",
+		params.valid_mask,
+		params.flags,
+		params.command_code,
+		params.heartbeat_int);
+	params.flags = params.flags & params.valid_mask;
+	dev->hb_interval = params.heartbeat_int;
+
+	return 0;
+}
+
+int apmf_get_dyn_slider_def_ac(struct amd_pmf_dev *pdev, struct apmf_dyn_slider_output *data)
+{
+	return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_AC, data, sizeof(*data));
+}
+
+int apmf_get_dyn_slider_def_dc(struct amd_pmf_dev *pdev, struct apmf_dyn_slider_output *data)
+{
+	return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_DC, data, sizeof(*data));
+}
+
+int apmf_install_handler(struct amd_pmf_dev *pmf_dev)
+{
+	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
+	acpi_status status;
+
+	/* Install the APMF Notify handler */
+	if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
+	    is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS)) {
+		status = acpi_install_notify_handler(ahandle, ACPI_ALL_NOTIFY,
+						     apmf_event_handler, pmf_dev);
+		if (ACPI_FAILURE(status)) {
+			dev_err(pmf_dev->dev, "failed to install notify handler\n");
+			return -ENODEV;
+		}
+
+		/* Call the handler once manually to catch up with possibly missed notifies. */
+		apmf_event_handler(ahandle, 0, pmf_dev);
+	}
+
+	return 0;
+}
+
+void apmf_acpi_deinit(struct amd_pmf_dev *pmf_dev)
+{
+	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
+
+	if (pmf_dev->hb_interval)
+		cancel_delayed_work_sync(&pmf_dev->heart_beat);
+
+	if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
+	    is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS))
+		acpi_remove_notify_handler(ahandle, ACPI_ALL_NOTIFY, apmf_event_handler);
+}
+
+int apmf_acpi_init(struct amd_pmf_dev *pmf_dev)
+{
+	int ret;
+
+	ret = apmf_if_verify_interface(pmf_dev);
+	if (ret) {
+		dev_err(pmf_dev->dev, "APMF verify interface failed :%d\n", ret);
+		goto out;
+	}
+
+	ret = apmf_get_system_params(pmf_dev);
+	if (ret) {
+		dev_err(pmf_dev->dev, "APMF apmf_get_system_params failed :%d\n", ret);
+		goto out;
+	}
+
+	if (pmf_dev->hb_interval) {
+		/* send heartbeats only if the interval is not zero */
+		INIT_DELAYED_WORK(&pmf_dev->heart_beat, apmf_sbios_heartbeat_notify);
+		schedule_delayed_work(&pmf_dev->heart_beat, 0);
+	}
+
+out:
+	return ret;
+}