Re: [PATCH v4 04/25] dmaengine: sdxi: Prepare function and sanitize MMIO state

[sashiko-bot@kernel.org]

> From: Nathan Lynch <nathan.lynch@amd.com>
> 
> Recover an inherited function state using bounded native stop/reset
> transitions and a PCI function reset that saves and restores PCI
> configuration. Use the locked reset API because probe and removal hold
> the device lock. If reset fails, disable bus mastering and wait
> for pending transactions as a best-effort fallback.
> 
> Disable inherited error logging before stop commands can provoke errors.
> After stopping, sanitize writable configuration in Chapter 9 order:
> preserve the function group ID, clear PASID and interrupt enables,
> restore CTL2 reset limits with operation groups disabled, discard stale
> context and supported RKey tables, and clear error-log state. Disable
> mailbox interrupts only on functions with SR-IOV mailbox support.
> 
> Keep mailbox commands and peer-owned payloads untouched. Status cleanup
> uses the specified write-one-to-clear semantics. Invoke preparation
> before feature configuration or publishing new DMA control structures.
> 
> Co-developed-by: Wei Huang <wei.huang2@amd.com>
> Signed-off-by: Wei Huang <wei.huang2@amd.com>
> Signed-off-by: Nathan Lynch <nathan.lynch@amd.com>

Sashiko has reviewed this patch and found no issues.

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