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Re: [PATCH v3 2/5] tests/qtest/libqos/pci: Introduce pio_limit
From: |
Alex Bennée |
Subject: |
Re: [PATCH v3 2/5] tests/qtest/libqos/pci: Introduce pio_limit |
Date: |
Tue, 05 Apr 2022 14:54:20 +0100 |
User-agent: |
mu4e 1.7.12; emacs 28.1.50 |
Eric Auger <eric.auger@redhat.com> writes:
> At the moment the IO space limit is hardcoded to
> QPCI_PIO_LIMIT = 0x10000. When accesses are performed to a bar,
> the base address of this latter is compared against the limit
> to decide whether we perform an IO or a memory access.
>
> On ARM, we cannot keep this PIO limit as the arm-virt machine
> uses [0x3eff0000, 0x3f000000 ] for the IO space map and we
> are mandated to allocate at 0x0.
>
> Add a new flag in QPCIBar indicating whether it is an IO bar
> or a memory bar. This flag is set on QPCIBar allocation and
> provisionned based on the BAR configuration. Then the new flag
> is used in access functions and in iomap() function.
>
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
--
Alex Bennée
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