In the Neoverse N1 SDP PCIe driver we need to map a page shared
between the firmware and the kernel. Previously we would use
pmap_kenter for this, however as this is not standardised between
architectures switch to the common pmap_qenter.
While here fix the error handling code to clean up on failure.
Reviewed by: br
Sponsored by: Innovate UK
Differential Revision: https://reviews.freebsd.org/D28890
Platform (N1SDP).
Neoverse N1 is a high-performance ARM microarchitecture designed
by the ARM Holdings for the server market.
The PCI part on N1SDP was shipped untested and suffers from some
integration issues.
For instance accessing to not existing BDFs causes System Error
(SError) exception. To mitigate this, the firmware scans the bus,
catches SErrors and creates a table with valid BDFs. That allows
us to filter-out accesses to invalid BDFs in this driver.
Also the root complex config space (BDF == 0) has an unusual
location in memory map, so remapping accesses to it is required.
Finally, the config space is restricted to 32-bit accesses only.
This was tested on the ARM boxes kindly provided by the ARM Ltd
to the DARPA CHERI Project.
In collaboration with: andrew
Reviewed by: andrew
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D23349
