[PATCH v8 3/5] Drivers: hv: vmbus: Convert acpi_device to more generic platform_device

Saurabh Sengar
2023-03-14T09:16:19Z

VMBus driver code currently has direct dependency on ACPI and struct
acpi_device. As a staging step toward optionally configuring based on
Devicetree instead of ACPI, use a more generic platform device to reduce
the dependency on ACPI where possible, though the dependency on ACPI
is not completely removed. Also rename the function vmbus_acpi_remove()
to the more generic vmbus_mmio_remove().

Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
---
drivers/hv/vmbus_drv.c | 58 +++++++++++++++++++++++++-----------------
1 file changed, 35 insertions(+), 23 deletions(-)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 229353f1e9c2..3ad2fa2b92e7 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 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_DMA_COHERENT);
return 0;
}

@@ -2081,7 +2082,7 @@ 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;
child_device_obj->device.release = vmbus_device_release;

child_device_obj->device.dma_parms = &child_device_obj->dma_parms;
@@ -2253,7 +2254,7 @@ 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;
@@ -2432,13 +2433,14 @@ 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 acpi_device *device = ACPI_COMPANION(&pdev->dev);

- hv_acpi_dev = device;
+ hv_dev = &device->dev;

/*
* Older versions of Hyper-V for ARM64 fail to include the _CCA
@@ -2480,10 +2482,21 @@ 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)
{
@@ -2649,15 +2662,15 @@ 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)
@@ -2741,12 +2754,11 @@ 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;
}
@@ -2776,8 +2788,8 @@ 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;
}

@@ -2830,7 +2842,7 @@ 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);
}

--
2.34.1