drm/xe: Remove sysfs only once on action add failure

The drmm_add_action_or_reset function automatically invokes the action
(sysfs removal) in the event of a failure; therefore, there's no
necessity to call it within the return check.

Modify the return type of xe_gt_ccs_mode_sysfs_init to int, allowing the
caller to pass errors up the call chain. Should sysfs creation or
drmm_add_action_or_reset fail, error propagation will prompt a driver
load abort.

-v2
Edit commit message (Nikula/Lucas)
use err_force_wake label instead of new. (Lucas)
Avoid unnecessary warn/error messages. (Lucas)

Fixes: f3bc5bb4d53d ("drm/xe: Allow userspace to configure CCS mode")
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240412181211.1155732-3-himal.prasad.ghimiray@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
(cherry picked from commit a99641e38704202ae2a97202b3d249208c9cda7f)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

drm/xe: Allow userspace to configure CCS mode

Allow user to configure the CCS mode setting through a
'ccs_mode' sysfs interface. Also report the current
CCS mode configuration and number of compute slices
available through this interface.

v2: Rebase, make it platform agnostic
v3: Separte out num_cslices sysfs interface and make
xe_gt_ccs_mode_sysfs_init() return void

Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drm/xe: Enable Fixed CCS mode setting

Disable dynamic HW load balancing of compute resource assignment
to engines and instead enabled fixed mode of mapping compute
resources to engines on all platforms with more than one compute
engine.

By default enable only one CCS engine with all compute slices
assigned to it. This is the desired configuration for common
workloads.

PVC platform supports only the fixed CCS mode (workaround 16016805146).

v2: Rebase, make it platform agnostic
v3: Minor code refactoring

Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>