linux-kernel - Re: [PATCH V2 1/2] PCI: dwc: Add API support to de-initialize host

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Message-ID: <3ff0649d-88ac-826f-cf24-55445fa5bb52@nvidia.com>
Date:   Thu, 2 May 2019 22:32:24 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>,
        <bhelgaas@...gle.com>, <Jisheng.Zhang@...aptics.com>,
        <thierry.reding@...il.com>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>, <sagar.tv@...il.com>
Subject: Re: [PATCH V2 1/2] PCI: dwc: Add API support to de-initialize host

On 5/2/2019 8:28 PM, Lorenzo Pieralisi wrote:
> On Tue, Apr 16, 2019 at 07:45:15PM +0530, Vidya Sagar wrote:
>> Add an API to group all the tasks to be done to de-initialize host which
>> can then be called by any DesignWare core based driver implementations
>> while adding .remove() support in their respective drivers.
>>
>> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
>> Acked-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
>> ---
>> v2:
>> * s/Designware/DesignWare
>>
>>   drivers/pci/controller/dwc/pcie-designware-host.c | 7 +++++++
>>   drivers/pci/controller/dwc/pcie-designware.h      | 5 +++++
>>   2 files changed, 12 insertions(+)
>>
>> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
>> index 3e4169e738a5..d7881490282d 100644
>> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
>> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
>> @@ -516,6 +516,13 @@ int dw_pcie_host_init(struct pcie_port *pp)
>>   	return ret;
>>   }
>>   
>> +void dw_pcie_host_deinit(struct pcie_port *pp)
>> +{
>> +	pci_stop_root_bus(pp->root_bus);
>> +	pci_remove_root_bus(pp->root_bus);
>> +	dw_pcie_free_msi(pp);
> 
> This must mirror the init path, so AFAICS it should not be done
> if pp->ops->msi_host_init != NULL
Done.
I'll add check "if (pci_msi_enabled() && !pp->ops->msi_host_init)"

> 
> Lorenzo
> 
>> +}
>> +
>>   static int dw_pcie_access_other_conf(struct pcie_port *pp, struct pci_bus *bus,
>>   				     u32 devfn, int where, int size, u32 *val,
>>   				     bool write)
>> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
>> index adff0c713665..ea8d1caf11c5 100644
>> --- a/drivers/pci/controller/dwc/pcie-designware.h
>> +++ b/drivers/pci/controller/dwc/pcie-designware.h
>> @@ -343,6 +343,7 @@ void dw_pcie_msi_init(struct pcie_port *pp);
>>   void dw_pcie_free_msi(struct pcie_port *pp);
>>   void dw_pcie_setup_rc(struct pcie_port *pp);
>>   int dw_pcie_host_init(struct pcie_port *pp);
>> +void dw_pcie_host_deinit(struct pcie_port *pp);
>>   int dw_pcie_allocate_domains(struct pcie_port *pp);
>>   #else
>>   static inline irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
>> @@ -367,6 +368,10 @@ static inline int dw_pcie_host_init(struct pcie_port *pp)
>>   	return 0;
>>   }
>>   
>> +static inline void dw_pcie_host_deinit(struct pcie_port *pp)
>> +{
>> +}
>> +
>>   static inline int dw_pcie_allocate_domains(struct pcie_port *pp)
>>   {
>>   	return 0;
>> -- 
>> 2.17.1
>>