Re: [PATCH v7 0/6] PCI: EP: Add RC-to-EP doorbell with platform MSI controller

[Niklas Cassel]

On Thu, Nov 14, 2024 at 05:52:36PM -0500, Frank Li wrote:
> ┌────────────┐   ┌───────────────────────────────────┐   ┌────────────────┐
> │            │   │                                   │   │                │
> │            │   │ PCI Endpoint                      │   │ PCI Host       │
> │            │   │                                   │   │                │
> │            │◄──┤ 1.platform_msi_domain_alloc_irqs()│   │                │
> │            │   │                                   │   │                │
> │ MSI        ├──►│ 2.write_msi_msg()                 ├──►├─BAR<n>         │
> │ Controller │   │   update doorbell register address│   │                │
> │            │   │   for BAR                         │   │                │
> │            │   │                                   │   │ 3. Write BAR<n>│
> │            │◄──┼───────────────────────────────────┼───┤                │
> │            │   │                                   │   │                │
> │            ├──►│ 4.Irq Handle                      │   │                │
> │            │   │                                   │   │                │
> │            │   │                                   │   │                │
> └────────────┘   └───────────────────────────────────┘   └────────────────┘
> 
> This patches based on old https://lore.kernel.org/imx/20221124055036.1630573-1-Frank.Li@xxxxxxx/
> 
> Original patch only target to vntb driver. But actually it is common
> method.
> 
> This patches add new API to pci-epf-core, so any EP driver can use it.
> 
> Previous v2 discussion here.
> https://lore.kernel.org/imx/20230911220920.1817033-1-Frank.Li@xxxxxxx/
> 
> Changes in v7:
> - Add helper function pci_epf_align_addr();
> - Link to v6: https://lore.kernel.org/r/20241112-ep-msi-v6-0-45f9722e3c2a@xxxxxxx

V7 looks very nice!

Tested-by: Niklas Cassel <cassel@xxxxxxxxxx>