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Drivers: hv: vmbus: Convert acpi_device to more generic platform_device 

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>
Link: https://lore.kernel.org/r/1679298460-11855-4-git-send-email-ssengar@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Saurabh Sengar 2023-03-20 00:47:38 -07:00 committed by Wei Liu
parent 1f6277bf71
commit 9c84342380
1 changed files with 35 additions and 23 deletions
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58
drivers/hv/vmbus_drv.c
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@ -12,6 +12,7 @@
#include <linux/init.h> #include <linux/init.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/device.h> #include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <linux/sysctl.h> #include <linux/sysctl.h>
#include <linux/slab.h> #include <linux/slab.h>
@ -44,7 +45,7 @@ struct vmbus_dynid {
struct hv_vmbus_device_id id; struct hv_vmbus_device_id id;
}; };
static struct acpi_device *hv_acpi_dev; static struct device *hv_dev;
static int hyperv_cpuhp_online; static int hyperv_cpuhp_online;
@ -143,7 +144,7 @@ static DEFINE_MUTEX(hyperv_mmio_lock);
static int vmbus_exists(void) static int vmbus_exists(void)
{ {
if (hv_acpi_dev == NULL) if (hv_dev == NULL)
return -ENODEV; return -ENODEV;
return 0; 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. * On x86/x64 coherence is assumed and these calls have no effect.
*/ */
hv_setup_dma_ops(child_device, 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; 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->channel->offermsg.offer.if_instance);
child_device_obj->device.bus = &hv_bus; 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.release = vmbus_device_release;
child_device_obj->device.dma_parms = &child_device_obj->dma_parms; 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; return AE_OK;
} }
static void vmbus_acpi_remove(struct acpi_device *device) static void vmbus_mmio_remove(void)
{ {
struct resource *cur_res; struct resource *cur_res;
struct resource *next_res; struct resource *next_res;
@ -2441,13 +2442,14 @@ void vmbus_free_mmio(resource_size_t start, resource_size_t size)
} }
EXPORT_SYMBOL_GPL(vmbus_free_mmio); 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; acpi_status result;
int ret_val = -ENODEV; int ret_val = -ENODEV;
struct acpi_device *ancestor; 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 * Older versions of Hyper-V for ARM64 fail to include the _CCA
@ -2489,10 +2491,21 @@ static int vmbus_acpi_add(struct acpi_device *device)
acpi_walk_err: acpi_walk_err:
if (ret_val) if (ret_val)
vmbus_acpi_remove(device); vmbus_mmio_remove();
return ret_val; 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 #ifdef CONFIG_PM_SLEEP
static int vmbus_bus_suspend(struct device *dev) static int vmbus_bus_suspend(struct device *dev)
{ {
@ -2658,15 +2671,15 @@ static const struct dev_pm_ops vmbus_bus_pm = {
.restore_noirq = vmbus_bus_resume .restore_noirq = vmbus_bus_resume
}; };
static struct acpi_driver vmbus_acpi_driver = { static struct platform_driver vmbus_platform_driver = {
.name = "vmbus", .probe = vmbus_platform_driver_probe,
.ids = vmbus_acpi_device_ids, .remove = vmbus_platform_driver_remove,
.ops = { .driver = {
.add = vmbus_acpi_add, .name = "vmbus",
.remove = vmbus_acpi_remove, .acpi_match_table = ACPI_PTR(vmbus_acpi_device_ids),
}, .pm = &vmbus_bus_pm,
.drv.pm = &vmbus_bus_pm, .probe_type = PROBE_FORCE_SYNCHRONOUS,
.drv.probe_type = PROBE_FORCE_SYNCHRONOUS, }
}; };
static void hv_kexec_handler(void) static void hv_kexec_handler(void)
@ -2750,12 +2763,11 @@ static int __init hv_acpi_init(void)
/* /*
* Get ACPI resources first. * Get ACPI resources first.
*/ */
ret = acpi_bus_register_driver(&vmbus_acpi_driver); ret = platform_driver_register(&vmbus_platform_driver);
if (ret) if (ret)
return ret; return ret;
if (!hv_acpi_dev) { if (!hv_dev) {
ret = -ENODEV; ret = -ENODEV;
goto cleanup; goto cleanup;
} }
@ -2785,8 +2797,8 @@ static int __init hv_acpi_init(void)
return 0; return 0;
cleanup: cleanup:
acpi_bus_unregister_driver(&vmbus_acpi_driver); platform_driver_unregister(&vmbus_platform_driver);
hv_acpi_dev = NULL; hv_dev = NULL;
return ret; return ret;
} }
@ -2839,7 +2851,7 @@ static void __exit vmbus_exit(void)
cpuhp_remove_state(hyperv_cpuhp_online); cpuhp_remove_state(hyperv_cpuhp_online);
hv_synic_free(); hv_synic_free();
acpi_bus_unregister_driver(&vmbus_acpi_driver); platform_driver_unregister(&vmbus_platform_driver);
} }