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Message-ID: <BYAPR21MB1688562198940168AD7C923BD7D89@BYAPR21MB1688.namprd21.prod.outlook.com>
Date: Wed, 8 Feb 2023 01:50:37 +0000
From: "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To: Saurabh Sengar <ssengar@...ux.microsoft.com>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"krzysztof.kozlowski+dt@...aro.org"
<krzysztof.kozlowski+dt@...aro.org>,
KY Srinivasan <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
"wei.liu@...nel.org" <wei.liu@...nel.org>,
Dexuan Cui <decui@...rosoft.com>,
"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
Saurabh Singh Sengar <ssengar@...rosoft.com>,
"dphadke@...ux.microsoft.com" <dphadke@...ux.microsoft.com>
Subject: RE: [PATCH v4 3/6] Drivers: hv: vmbus: Convert acpi_device to more
generic platform_device
From: Saurabh Sengar <ssengar@...ux.microsoft.com> Sent: Monday, February 6, 2023 11:50 PM
>
> Use more generic platform device instead of acpi device. Also rename the
> function vmbus_acpi_remove to more generic name vmbus_mmio_remove.
Let me suggest a slightly expanded commit message along these lines:
VMBus driver code currently has direct dependency on ACPI and struct
acpi_device. As a staging step toward optionally configuring based on
device tree 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().
With this tweak,
Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
>
> Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
> ---
> [V4]
> - rebased which fixed return type of 'vmbus_mmio_remove' from int to void
>
> 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 d24dd65..7349715 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 int hv_die_panic_notify_crash(struct notifier_block *self,
>
> 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;
> }
>
> @@ -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;
> 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 +2442,14 @@ 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
> @@ -2489,10 +2491,21 @@ 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 +2671,15 @@ static int vmbus_bus_resume(struct device *dev)
> .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 +2763,11 @@ 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 +2797,8 @@ 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 +2851,7 @@ 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);
> }
>
>
> --
> 1.8.3.1
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