cxl/acpi: Convert QTG _DSM latencies to picoseconds

The QTG _DSM expects read and write latencies in picoseconds, as
specified in CXL 3.0, Table 9-30.

The code base originally kept the latencies passed to the QTG _DSM in
picoseconds in effect. Commit 51293c565cf4 ("cxl: Fix incorrect region
perf data calculation") normalized CDAT and host bridge latencies to
nanoseconds, but did not add a conversion back to picoseconds when
constructing the _DSM input. Firmware can therefore select QTG IDs using
understated latencies.

Convert the latencies to picoseconds when constructing the _DSM input
package. Multiply in 64 bits and reject latencies that cannot fit in the
DWORD inputs defined by the specification.

Fixes: 51293c565cf4 ("cxl: Fix incorrect region perf data calculation")
Cc: stable@vger.kernel.org
Signed-off-by: Koichiro Den <den@valinux.co.jp>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20261009045452.1107921-4-den@valinux.co.jp
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

0 files changed, 0 insertions, 0 deletions