Re: [PATCH v2 1/3] PCI: dwc: Reuse Endpoint resources after fundamental reset

[sashiko-bot@kernel.org]

> A fundamental reset clears DWC Endpoint registers but does not end the
> lifetime of the bound driver. Each full cleanup/init cycle removes and
> recreates debugfs entries and, when eDMA is present, unregisters and
> reprobes the DMA controller. eDMA detection also allocates managed DMA
> linked-list memory that is retained until device detach. The
> inbound/outbound allocation bitmaps, outbound-address array and
> per-function descriptors already have allocation guards and can be
> reused.
> 
> Track successful resource initialization in dw_pcie_ep_init_registers().
> On later calls, restore the platform-specific registers, BAR defaults,
> PTM and non-sticky registers without repeating resource setup. Keep the
> register restoration helper private and use the existing public API for
> both initial setup and reset recovery. Clear the initialization flag on
> full cleanup so a later call performs resource setup again.
> 
> Invalidate the outbound window bitmap, address array and MSI iATU cache
> after hardware has reset the iATU. This resets software bookkeeping; it
> does not disable or unmap live hardware windows. Document that reset
> recovery requires the hardware reset and quiesced EPF activity.
> 
> Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>

Sashiko has reviewed this patch and found no issues.

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20261021061903.1269605-1-mmaddireddy@nvidia.com?part=1