linux-kernel - Re: [RFC 01/10] PCI: dwc: Add MSI-X callbacks handler

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Message-ID: <0e8b8ce9-db12-1e11-3eb5-62f3fa686d59@ti.com>
Date:   Tue, 24 Apr 2018 12:37:58 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "Joao.Pinto@...opsys.com" <Joao.Pinto@...opsys.com>,
        "jingoohan1@...il.com" <jingoohan1@...il.com>,
        "adouglas@...ence.com" <adouglas@...ence.com>,
        "niklas.cassel@...s.com" <niklas.cassel@...s.com>,
        "jesper.nilsson@...s.com" <jesper.nilsson@...s.com>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 01/10] PCI: dwc: Add MSI-X callbacks handler

Hi,

On Monday 23 April 2018 03:06 PM, Gustavo Pimentel wrote:
> Hi Kishon,
> 
> On 16/04/2018 10:29, Kishon Vijay Abraham I wrote:
>> Hi Gustavo,
>>
>> On Tuesday 10 April 2018 10:44 PM, Gustavo Pimentel wrote:
>>> Changes the pcie_raise_irq function signature, namely the interrupt_num
>>> variable type from u8 to u16 to accommodate the MSI-X maximum interrupts
>>> of 2048.
>>>
>>> Implements a PCIe config space capability iterator function to search and
>>> save the MSI and MSI-X pointers. With this method the code becomes more
>>> generic and flexible.
>>>
>>> Implements MSI-X set/get functions for sysfs interface in order to change
>>> the EP entries number.
>>>
>>> Implements EP MSI-X interface for triggering interruptions.
>>>
>>> Signed-off-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
>>> ---
>>>  drivers/pci/dwc/pci-dra7xx.c           |   2 +-
>>>  drivers/pci/dwc/pcie-artpec6.c         |   2 +-
>>>  drivers/pci/dwc/pcie-designware-ep.c   | 145 ++++++++++++++++++++++++++++++++-
>>>  drivers/pci/dwc/pcie-designware-plat.c |   6 +-
>>>  drivers/pci/dwc/pcie-designware.h      |  23 +++++-
>>>  5 files changed, 173 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
>>> index ed8558d..5265725 100644
>>> --- a/drivers/pci/dwc/pci-dra7xx.c
>>> +++ b/drivers/pci/dwc/pci-dra7xx.c
>>> @@ -369,7 +369,7 @@ static void dra7xx_pcie_raise_msi_irq(struct dra7xx_pcie *dra7xx,
>>>  }
>>>  
>>>  static int dra7xx_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
>>> -				 enum pci_epc_irq_type type, u8 interrupt_num)
>>> +				 enum pci_epc_irq_type type, u16 interrupt_num)
>>>  {
>>>  	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
>>>  	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
>>> diff --git a/drivers/pci/dwc/pcie-artpec6.c b/drivers/pci/dwc/pcie-artpec6.c
>>> index e66cede..96dc259 100644
>>> --- a/drivers/pci/dwc/pcie-artpec6.c
>>> +++ b/drivers/pci/dwc/pcie-artpec6.c
>>> @@ -428,7 +428,7 @@ static void artpec6_pcie_ep_init(struct dw_pcie_ep *ep)
>>>  }
>>>  
>>>  static int artpec6_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
>>> -				  enum pci_epc_irq_type type, u8 interrupt_num)
>>> +				  enum pci_epc_irq_type type, u16 interrupt_num)
>>>  {
>>>  	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
>>>  
>>> diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c
>>> index 15b22a6..874d4c2 100644
>>> --- a/drivers/pci/dwc/pcie-designware-ep.c
>>> +++ b/drivers/pci/dwc/pcie-designware-ep.c
>>> @@ -40,6 +40,44 @@ void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
>>>  	__dw_pcie_ep_reset_bar(pci, bar, 0);
>>>  }
>>>  
>>> +void dw_pcie_ep_find_cap_addr(struct dw_pcie_ep *ep)
>>> +{
>>
>> This should be implemented in a generic way similar to pci_find_capability().
>> It'll be useful when we try to implement other capabilities as well.
> 
> Hum, what you suggest? Something implemented on the pci-epf-core?

yeah, Initially thought it could be implemented as a helper function in
pci-epc-core so that both designware and cadence can use it.

But do we really have to find the address like this? since all designware IP's
will have a particular capability at a fixed address offset, why not follow use
existing mechanism in dw_pcie_ep_get_msi?

Or is it possible for a particular capability to have address offsets for
different vendors? How is it for cadence?

Thanks
Kishon