c1777be364
I/O stacks to PMON mapping on Skylake server relies on topology information from CPU_BUS_NO MSR but this approach is not applicable for SNR and ICX. Mapping on these platforms can be gotten by reading SAD_CONTROL_CFG CSR from Mesh2IIO device with 0x09a2 DID. SAD_CONTROL_CFG CSR contains stack IDs in its own notation which are statically mapped on IDs in PMON notation. The map for Snowridge: Stack Name | CBDMA/DMI | PCIe Gen 3 | DLB | NIS | QAT SAD_CONTROL_CFG ID | 0 | 1 | 2 | 3 | 4 PMON ID | 1 | 4 | 3 | 2 | 0 This patch enables I/O stacks to IIO PMON mapping on Snowridge. Mapping is exposed through attributes /sys/devices/uncore_iio_<pmu_idx>/dieX, where dieX is file which holds "Segment:Root Bus" for PCIe root port which can be monitored by that IIO PMON block. Example for Snowridge: ==> /sys/devices/uncore_iio_0/die0 <== 0000:f3 ==> /sys/devices/uncore_iio_1/die0 <== 0000:00 ==> /sys/devices/uncore_iio_2/die0 <== 0000:eb ==> /sys/devices/uncore_iio_3/die0 <== 0000:e3 ==> /sys/devices/uncore_iio_4/die0 <== 0000:14 Mapping for Icelake server will be enabled in the follow-up patch. Signed-off-by: Alexander Antonov <alexander.antonov@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Kan Liang <kan.liang@linux.intel.com> Link: https://lkml.kernel.org/r/20210426131614.16205-3-alexander.antonov@linux.intel.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.