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Re: [PATCH v1 1/2] drivers/ehci-dbgp: remove use of run_in_exception_handle()
- To: dmkhn@xxxxxxxxx
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 29 Jul 2025 10:45:28 +0200
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- Cc: andrew.cooper3@xxxxxxxxxx, anthony.perard@xxxxxxxxxx, julien@xxxxxxx, michal.orzel@xxxxxxx, roger.pau@xxxxxxxxxx, sstabellini@xxxxxxxxxx, dmukhin@xxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 29 Jul 2025 08:45:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 28.07.2025 22:23, dmkhn@xxxxxxxxx wrote:
> From: Denis Mukhin <dmukhin@xxxxxxxx>
>
> Polling is relevant for early boot only where facilities requiring
> run_in_exception_handler() are not used (e.g. 'd' keyhandler).
I fear I don't understand this statement: How is polling relevant for
early boot only? If the IRQ isn't found to work, we continue using
polling perhaps for the entire lifetime of a system. For ns16550 I
know I've seen such systems (especially before MSI support was added).
Note that there even is a way to suppress use of an IRQ via command
line option (setting the IRQ field of the option to 0). That implies
that polling is going to be used forever. For EHCI there isn't even
an IRQ to use.
Jan
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