Hi,
On 16/08/19 8:28 AM, Xiaowei Bao wrote:
>
>
>> -----Original Message-----
>> From: Andrew Murray <andrew.murray@xxxxxxx>
>> Sent: 2019年8月15日 19:54
>> To: Xiaowei Bao <xiaowei.bao@xxxxxxx>
>> Cc: jingoohan1@xxxxxxxxx; gustavo.pimentel@xxxxxxxxxxxx;
>> bhelgaas@xxxxxxxxxx; robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx;
>> shawnguo@xxxxxxxxxx; Leo Li <leoyang.li@xxxxxxx>; kishon@xxxxxx;
>> lorenzo.pieralisi@xxxxxxx; arnd@xxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx;
>> M.h. Lian <minghuan.lian@xxxxxxx>; Mingkai Hu <mingkai.hu@xxxxxxx>;
>> Roy Zang <roy.zang@xxxxxxx>; linux-pci@xxxxxxxxxxxxxxx;
>> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
>> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linuxppc-dev@xxxxxxxxxxxxxxxx
>> Subject: Re: [PATCH 02/10] PCI: designware-ep: Add the doorbell mode of
>> MSI-X in EP mode
>>
>> On Thu, Aug 15, 2019 at 04:37:08PM +0800, Xiaowei Bao wrote:
>>> Add the doorbell mode of MSI-X in EP mode.
>>>
>>> Signed-off-by: Xiaowei Bao <xiaowei.bao@xxxxxxx>
>>> ---
>>> drivers/pci/controller/dwc/pcie-designware-ep.c | 14 ++++++++++++++
>>> drivers/pci/controller/dwc/pcie-designware.h | 14 ++++++++++++++
>>> 2 files changed, 28 insertions(+)
>>>
>>> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c
>>> b/drivers/pci/controller/dwc/pcie-designware-ep.c
>>> index 75e2955..e3a7cdf 100644
>>> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
>>> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
>>> @@ -454,6 +454,20 @@ int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep
>> *ep, u8 func_no,
>>> return 0;
>>> }
>>>
>>> +int dw_pcie_ep_raise_msix_irq_doorbell(struct dw_pcie_ep *ep, u8
>> func_no,
>>> + u16 interrupt_num)
>>> +{
>>> + struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
>>> + u32 msg_data;
>>> +
>>> + msg_data = (func_no << PCIE_MSIX_DOORBELL_PF_SHIFT) |
>>> + (interrupt_num - 1);
>>> +
>>> + dw_pcie_writel_dbi(pci, PCIE_MSIX_DOORBELL, msg_data);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
>>> u16 interrupt_num)
>>
>> Have I understood correctly that the hardware provides an alternative
>> mechanism that allows for raising MSI-X interrupts without the bother of
>> reading the capabilities registers?
> Yes, the hardware provide two way to MSI-X, please check the page 492 of
> DWC_pcie_dm_registers_4.30 Menu.
> MSIX_DOORBELL_OFF on page 492 0x948 Description: MSI-X Doorbell Register....>
>>
>> If so is there any good reason to keep dw_pcie_ep_raise_msix_irq? (And thus
>> use it in dw_plat_pcie_ep_raise_irq also)?
> I am not sure, but I think the dw_pcie_ep_raise_msix_irq function is not correct,
> because I think we can't get the MSIX table from the address ep->phys_base + tbl_addr,
> but I also don't know where I can get the correct MSIX table.
Sometime back when I tried raising MSI-X from EP, it was failing. It's quite
possible dw_pcie_ep_raise_msix_irq function is not correct.
MSI-X table can be obtained from the inbound ATU corresponding to the MSIX bar.
IMO MSI-X support in EP mode needs rework. For instance set_msix should also
take BAR number as input to be configured in the MSI-X capability. The function
driver (pci-epf-test.c) should allocate memory taking into account the MSI-X table.
Thanks
Kishon
