Re: [PATCH v7 10/20] gunyah: rsc_mgr: Add resource manager RPC core

Elliot Berman
2022-12-12T23:47:33Z

On 11/21/2022 7:23 AM, Greg Kroah-Hartman wrote:
> On Mon, Nov 21, 2022 at 05:59:59AM -0800, Elliot Berman wrote:
>> The resource manager is a special virtual machine which is always
>> running on a Gunyah system. It provides APIs for creating and destroying
>> VMs, secure memory management, sharing/lending of memory between VMs,
>> and setup of inter-VM communication. Calls to the resource manager are
>> made via message queues.
>>
>> This patch implements the basic probing and RPC mechanism to make those
>> API calls. Request/response calls can be made with gh_rm_call.
>> Drivers can also register to notifications pushed by RM via
>> gh_rm_register_notifier
>>
>> Specific API calls that resource manager supports will be implemented in
>> subsequent patches.
>>
>> Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
>> ---
>> MAINTAINERS | 2 +-
>> drivers/virt/gunyah/Kconfig | 7 +
>> drivers/virt/gunyah/Makefile | 2 +
>> drivers/virt/gunyah/gunyah_rm_rpc.c | 570 +++++++++++++++++++++++++++
>> drivers/virt/gunyah/gunyah_rsc_mgr.c | 50 +++
>> drivers/virt/gunyah/rsc_mgr.h | 37 ++
>> include/linux/gunyah_rsc_mgr.h | 18 +
>> 7 files changed, 685 insertions(+), 1 deletion(-)
>> create mode 100644 drivers/virt/gunyah/gunyah_rm_rpc.c
>> create mode 100644 drivers/virt/gunyah/gunyah_rsc_mgr.c
>> create mode 100644 drivers/virt/gunyah/rsc_mgr.h
>> create mode 100644 include/linux/gunyah_rsc_mgr.h
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 502798197b80..b65f7ff444e5 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -8948,7 +8948,7 @@ F: Documentation/virt/gunyah/
>> F: arch/arm64/gunyah/
>> F: drivers/mailbox/gunyah-msgq.c
>> F: drivers/virt/gunyah/
>> -F: include/linux/gunyah.h
>> +F: include/linux/gunyah*.h
>>
>> HABANALABS PCI DRIVER
>> M: Oded Gabbay <ogabbay@kernel.org>
>> diff --git a/drivers/virt/gunyah/Kconfig b/drivers/virt/gunyah/Kconfig
>> index 127156a678a6..0bb497372d4e 100644
>> --- a/drivers/virt/gunyah/Kconfig
>> +++ b/drivers/virt/gunyah/Kconfig
>> @@ -10,3 +10,10 @@ config GUNYAH
>>
>> Say Y/M here to enable the drivers needed to interact in a Gunyah
>> virtual environment.
>> +
>> +if GUNYAH
>> +config GUNYAH_RESOURCE_MANAGER
>> + tristate
>> + depends on MAILBOX
>> + select GUNYAH_MESSAGE_QUEUES
>> +endif
>> diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile
>> index 2ac4ee64b89d..b62ac4045621 100644
>> --- a/drivers/virt/gunyah/Makefile
>> +++ b/drivers/virt/gunyah/Makefile
>> @@ -1 +1,3 @@
>> obj-$(CONFIG_GUNYAH) += gunyah.o
>> +
>> +obj-$(CONFIG_GUNYAH_RESOURCE_MANAGER) += gunyah_rsc_mgr.o gunyah_rm_rpc.o
>> diff --git a/drivers/virt/gunyah/gunyah_rm_rpc.c b/drivers/virt/gunyah/gunyah_rm_rpc.c
>> new file mode 100644
>> index 000000000000..45b1a8691982
>> --- /dev/null
>> +++ b/drivers/virt/gunyah/gunyah_rm_rpc.c
>> @@ -0,0 +1,570 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
>> + */
>> +
>> +#include <linux/of.h>
>> +#include <linux/slab.h>
>> +#include <linux/mutex.h>
>> +#include <linux/sched.h>
>> +#include <linux/gunyah.h>
>> +#include <linux/module.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/kthread.h>
>> +#include <linux/notifier.h>
>> +#include <linux/workqueue.h>
>> +#include <linux/completion.h>
>> +#include <linux/gunyah_rsc_mgr.h>
>> +#include <linux/platform_device.h>
>
> This should not have anything to do with a platform device, please see
> below.
>
>> +#include <linux/gunyah_rsc_mgr.h>
>> +#include <linux/platform_device.h>
>> +
>> +#include "rsc_mgr.h"
>> +
>> +static int gh_rm_drv_probe(struct platform_device *pdev)
>
> Why is this tied to a platformm device?
>
> I don't understand the relationship here, sorry.
> >> +{
>> + struct gh_rm_rpc *rsc_mgr;
>> +
>> + rsc_mgr = gh_rm_rpc_init(pdev);
>
> Shouldn't this be creating a new one that is just a child passed in?
> Shouldn't this call just take a 'struct device *'?
>

I'm following the suggestion from Arnd to have small core module that
calls into initialization routines for the other parts of the driver,
rather than creating bus for a few (2) devices.

https://lore.kernel.org/all/a3754259-9989-495e-a6bd-5501daff06a2@app.fastmail.com/

Thanks,
Elliot