[PATCH v1 0/2] drm/xe:Mutual exclusivity between CCS-mode and PF

[Nareshkumar Gollakoti <naresh.kumar.g@intel.com>]

Due to SLA agreement between PF and VFs,the alternate CCS-mode
cannot be changed when VFs are already enabled.
Similarly, enabling VFs is not permitted when the alternate
CCS-mode is active. Also skipping populating
CCS-mode sysfs entry in VF Mode.

---
v2:
- function xe_device_is_vf_enabled has been refactored to
  xe_sriov_pf_has_vfs_enabled and moved to xe_sriov_pf_helper.h.
- The code now distinctly checks for SR-IOV VF mode and
  SR-IOV PF with VFs enabled.
- Log messages have been updated to explicitly state the current mode.
- The function xe_multi_ccs_mode_enabled is moved to xe_device.h

v3: Described missed arg documentation for xe_sriov_pf_has_vfs_enabled

v4:
- sysfs interface for CCS mode is not initialized
  when operating in SRIOV VF Mode.
- xe_sriov_pf_has_vfs_enabled() check is sufficient while CCS mode
  enablement.
- remove unnecessary comments as flow is self explanatory.

v5:(review comments from Michal)
- Add xe device level CCS mode block with mutex lock and CCS mode state
- necessesary functions to manage ccs mode state to provide strict mutual
  exclusive support b/w CCS mode & SRIOV VF enabling

v6:
- Re modeled implementation based on lockdown the PF using custom guard
  supported functions by Michal

v7:
- Corrected patch style as message written as subject
- Used public PF lockdown functions instead internal funcions(Michal)
- Creating CCS Mode entries only on PF Mode

v8:(Michal)
- updated short subject and few comments
- used guard for mutex
- Add a check of PF Mode to ensure use of xe_sriov_pf_lockdown only in
  PF Mode
- Added default CCS mode check to xe_gt_ccs_mode_default(gt) function

v9:(Michal)
- Added xe_gt_ccs_mode_default(gt) as static inline and it can be used
  across driver to use between default or alternate CCS mode
- removed comment from obvious code

Nareshkumar Gollakoti (2):
  drm/xe: Fix Prevent VFs from exposing the CCS mode sysfs file
  drm/xe: Mutual exclusivity between CCS-mode and PF

 drivers/gpu/drm/xe/xe_gt_ccs_mode.c | 61 ++++++++++++++++++++++-------
 drivers/gpu/drm/xe/xe_gt_ccs_mode.h | 12 ++++++
 2 files changed, 58 insertions(+), 15 deletions(-)

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2.43.0