Registers a configfs subsystem called 'xe' that creates a
directory in the mounted configfs directory (/sys/kernel/config)
Userspace can then create the device that has to be configured
under the xe directory
mkdir /sys/kernel/config/xe/0000:03:00.0
The device created will have the following attributes to be
configured
/sys/kernel/config/xe/
.. 0000:03:00.0/
... survivability_mode
v2: fix kernel-doc
fix return value (Lucas)
v3: fix kernel-doc (Lucas)
Signed-off-by: Riana Tauro <riana.tauro@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://lore.kernel.org/r/20250407051414.1651616-2-riana.tauro@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Print the accumulated runtime for client when printing fdinfo.
Each time a query is done it first does 2 things:
1) loop through all the exec queues for the current client and
accumulate the runtime, per engine class. CTX_TIMESTAMP is used for
that, being read from the context image.
2) Read a "GPU timestamp" that can be used for considering "how much GPU
time has passed" and that has the same unit/refclock as the one
recording the runtime. RING_TIMESTAMP is used for that via MMIO.
Since for all current platforms RING_TIMESTAMP follows the same
refclock, just read it once, using any first engine available.
This is exported to userspace as 2 numbers in fdinfo:
drm-cycles-<class>: <RUNTIME>
drm-total-cycles-<class>: <TIMESTAMP>
Userspace is expected to collect at least 2 samples, which allows to
know the client engine busyness as per:
RUNTIME1 - RUNTIME0
busyness = ---------------------
T1 - T0
Since drm-cycles-<class> always starts at 0, it's also possible to know
if and engine was ever used by a client.
It's expected that userspace will read any 2 samples every few seconds.
Given the update frequency of the counters involved and that
CTX_TIMESTAMP is 32-bits, the counter for each exec_queue can wrap
around (assuming 100% utilization) after ~200s. The wraparound is not
perceived by userspace since it's just accumulated for all the
exec_queues in a 64-bit counter) but the measurement will not be
accurate if the samples are too far apart.
This could be mitigated by adding a workqueue to accumulate the counters
every so often, but it's additional complexity for something that is
done already by userspace every few seconds in tools like gputop (from
igt), htop, nvtop, etc, with none of them really defaulting to 1 sample
per minute or more.
Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Acked-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240517204310.88854-9-lucas.demarchi@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
The GSC-enabled HuC binary starts with a GSC header, which is followed
by the legacy-style CSS header and the binary itself. We can parse the
GSC headers to find the HuC version and the location of the binary to
be used for the DMA transfer.
The parsing function has been designed to be re-used for the GSC binary,
so the entry names are external parameters (because the GSC uses
different ones) and the CSS entry is optional (because the GSC doesn't
have it).
v2: move new code to uc_fw.c, better comments and error checking, split
old code move to separate patch (Lucas), move headers and
documentation to uc_fw_abi.h.
v3: use 2 separate loops, rework marker check (Lucas)
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
GSC binaries and newer HuC ones use GSC-style headers instead of the
CSS. In preparation for adding support for such parsing, split out the
current parsing code to its own function, to make it cleaner to add the
new paths. The existing doc section has also been renamed to narrow it
to CSS-based binaries.
v2: new patch in series, split out from next patch for easier reviewing
v3: drop unneeded include (Lucas)
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
