From:   Saurabh Sengar <ssengar@linux.microsoft.com>
To:     robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
        kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org,
        decui@microsoft.com, daniel.lezcano@linaro.org, tglx@linutronix.de,
        virtualization@lists.linux-foundation.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-hyperv@vger.kernel.org, mikelley@microsoft.com,
        ssengar@microsoft.com
Subject: [PATCH v2 3/6] Drivers: hv: vmbus: Convert acpi_device to platform_device
Date:   Tue, 31 Jan 2023 10:10:06 -0800
Message-Id: <1675188609-20913-4-git-send-email-ssengar@linux.microsoft.com>
In-Reply-To: <1675188609-20913-1-git-send-email-ssengar@linux.microsoft.com>
References: <1675188609-20913-1-git-send-email-ssengar@linux.microsoft.com>
Precedence: bulk

Use more generic platform device instead of acpi device. Also rename the
function vmbus_acpi_remove to more generic name vmbus_mmio_remove.

Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
---
 drivers/hv/vmbus_drv.c | 78 +++++++++++++++++++++++++-----------------
 1 file changed, 46 insertions(+), 32 deletions(-)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index d24dd65b33d4..49030e756b9f 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -12,6 +12,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/device.h>
+#include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/sysctl.h>
 #include <linux/slab.h>
@@ -44,7 +45,7 @@ struct vmbus_dynid {
 	struct hv_vmbus_device_id id;
 };
 
-static struct acpi_device  *hv_acpi_dev;
+static struct platform_device  *hv_dev;
 
 static int hyperv_cpuhp_online;
 
@@ -143,7 +144,7 @@ static DEFINE_MUTEX(hyperv_mmio_lock);
 
 static int vmbus_exists(void)
 {
-	if (hv_acpi_dev == NULL)
+	if (hv_dev == NULL)
 		return -ENODEV;
 
 	return 0;
@@ -932,7 +933,7 @@ static int vmbus_dma_configure(struct device *child_device)
 	 * On x86/x64 coherence is assumed and these calls have no effect.
 	 */
 	hv_setup_dma_ops(child_device,
-		device_get_dma_attr(&hv_acpi_dev->dev) == DEV_DMA_COHERENT);
+		device_get_dma_attr(&hv_dev->dev) == DEV_DMA_COHERENT);
 	return 0;
 }
 
@@ -2090,7 +2091,7 @@ int vmbus_device_register(struct hv_device *child_device_obj)
 		     &child_device_obj->channel->offermsg.offer.if_instance);
 
 	child_device_obj->device.bus = &hv_bus;
-	child_device_obj->device.parent = &hv_acpi_dev->dev;
+	child_device_obj->device.parent = &hv_dev->dev;
 	child_device_obj->device.release = vmbus_device_release;
 
 	child_device_obj->device.dma_parms = &child_device_obj->dma_parms;
@@ -2262,7 +2263,7 @@ static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx)
 	return AE_OK;
 }
 
-static void vmbus_acpi_remove(struct acpi_device *device)
+static void vmbus_mmio_remove(void)
 {
 	struct resource *cur_res;
 	struct resource *next_res;
@@ -2441,13 +2442,15 @@ void vmbus_free_mmio(resource_size_t start, resource_size_t size)
 }
 EXPORT_SYMBOL_GPL(vmbus_free_mmio);
 
-static int vmbus_acpi_add(struct acpi_device *device)
+static int vmbus_acpi_add(struct platform_device *pdev)
 {
 	acpi_status result;
 	int ret_val = -ENODEV;
-	struct acpi_device *ancestor;
+	struct platform_device *ancestor;
+	struct acpi_device *adev = to_acpi_device(&pdev->dev);
 
-	hv_acpi_dev = device;
+	hv_dev = pdev;
+	adev->fwnode.dev = &pdev->dev;
 
 	/*
 	 * Older versions of Hyper-V for ARM64 fail to include the _CCA
@@ -2456,15 +2459,16 @@ static int vmbus_acpi_add(struct acpi_device *device)
 	 * up the ACPI device to behave as if _CCA is present and indicates
 	 * hardware coherence.
 	 */
-	ACPI_COMPANION_SET(&device->dev, device);
+	ACPI_COMPANION_SET(&pdev->dev, ACPI_COMPANION(&pdev->dev));
 	if (IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED) &&
-	    device_get_dma_attr(&device->dev) == DEV_DMA_NOT_SUPPORTED) {
+	    device_get_dma_attr(&pdev->dev) == DEV_DMA_NOT_SUPPORTED) {
+		struct acpi_device *adev_node = ACPI_COMPANION(&pdev->dev);
 		pr_info("No ACPI _CCA found; assuming coherent device I/O\n");
-		device->flags.cca_seen = true;
-		device->flags.coherent_dma = true;
+		adev_node->flags.cca_seen = true;
+		adev_node->flags.coherent_dma = true;
 	}
 
-	result = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
+	result = acpi_walk_resources(ACPI_HANDLE(&pdev->dev), METHOD_NAME__CRS,
 					vmbus_walk_resources, NULL);
 
 	if (ACPI_FAILURE(result))
@@ -2473,9 +2477,9 @@ static int vmbus_acpi_add(struct acpi_device *device)
 	 * Some ancestor of the vmbus acpi device (Gen1 or Gen2
 	 * firmware) is the VMOD that has the mmio ranges. Get that.
 	 */
-	for (ancestor = acpi_dev_parent(device); ancestor;
-	     ancestor = acpi_dev_parent(ancestor)) {
-		result = acpi_walk_resources(ancestor->handle, METHOD_NAME__CRS,
+	for (ancestor = to_platform_device(pdev->dev.parent); ancestor;
+	     ancestor = to_platform_device(ancestor->dev.parent)) {
+		result = acpi_walk_resources(ACPI_HANDLE(&ancestor->dev), METHOD_NAME__CRS,
 					     vmbus_walk_resources, NULL);
 
 		if (ACPI_FAILURE(result))
@@ -2489,10 +2493,21 @@ static int vmbus_acpi_add(struct acpi_device *device)
 
 acpi_walk_err:
 	if (ret_val)
-		vmbus_acpi_remove(device);
+		vmbus_mmio_remove();
 	return ret_val;
 }
 
+static int vmbus_platform_driver_probe(struct platform_device *pdev)
+{
+	return vmbus_acpi_add(pdev);
+}
+
+static int vmbus_platform_driver_remove(struct platform_device *pdev)
+{
+	vmbus_mmio_remove();
+	return 0;
+}
+
 #ifdef CONFIG_PM_SLEEP
 static int vmbus_bus_suspend(struct device *dev)
 {
@@ -2658,15 +2673,15 @@ static const struct dev_pm_ops vmbus_bus_pm = {
 	.restore_noirq	= vmbus_bus_resume
 };
 
-static struct acpi_driver vmbus_acpi_driver = {
-	.name = "vmbus",
-	.ids = vmbus_acpi_device_ids,
-	.ops = {
-		.add = vmbus_acpi_add,
-		.remove = vmbus_acpi_remove,
-	},
-	.drv.pm = &vmbus_bus_pm,
-	.drv.probe_type = PROBE_FORCE_SYNCHRONOUS,
+static struct platform_driver vmbus_platform_driver = {
+	.probe = vmbus_platform_driver_probe,
+	.remove = vmbus_platform_driver_remove,
+	.driver = {
+		.name = "vmbus",
+		.acpi_match_table = ACPI_PTR(vmbus_acpi_device_ids),
+		.pm = &vmbus_bus_pm,
+		.probe_type = PROBE_FORCE_SYNCHRONOUS,
+	}
 };
 
 static void hv_kexec_handler(void)
@@ -2750,12 +2765,11 @@ static int __init hv_acpi_init(void)
 	/*
 	 * Get ACPI resources first.
 	 */
-	ret = acpi_bus_register_driver(&vmbus_acpi_driver);
-
+	ret = platform_driver_register(&vmbus_platform_driver);
 	if (ret)
 		return ret;
 
-	if (!hv_acpi_dev) {
+	if (!hv_dev) {
 		ret = -ENODEV;
 		goto cleanup;
 	}
@@ -2785,8 +2799,8 @@ static int __init hv_acpi_init(void)
 	return 0;
 
 cleanup:
-	acpi_bus_unregister_driver(&vmbus_acpi_driver);
-	hv_acpi_dev = NULL;
+	platform_driver_unregister(&vmbus_platform_driver);
+	hv_dev = NULL;
 	return ret;
 }
 
@@ -2839,7 +2853,7 @@ static void __exit vmbus_exit(void)
 
 	cpuhp_remove_state(hyperv_cpuhp_online);
 	hv_synic_free();
-	acpi_bus_unregister_driver(&vmbus_acpi_driver);
+	platform_driver_unregister(&vmbus_platform_driver);
 }
 
 
-- 
2.25.1