diff options
Diffstat (limited to 'drivers/gpu/drm/xe/xe_mocs.c')
| -rw-r--r-- | drivers/gpu/drm/xe/xe_mocs.c | 32 |
1 files changed, 11 insertions, 21 deletions
diff --git a/drivers/gpu/drm/xe/xe_mocs.c b/drivers/gpu/drm/xe/xe_mocs.c index a072fbccc693..2d380053b477 100644 --- a/drivers/gpu/drm/xe/xe_mocs.c +++ b/drivers/gpu/drm/xe/xe_mocs.c @@ -123,30 +123,20 @@ struct xe_mocs_info { * * These tables are intended to be kept reasonably consistent across * HW platforms, and for ICL+, be identical across OSes. To achieve - * that, for Icelake and above, list of entries is published as part - * of bspec. + * that, the list of entries is published as part of bspec. * - * Entries not part of the following tables are undefined as far as - * userspace is concerned and shouldn't be relied upon. For Gen < 12 - * they will be initialized to PTE. Gen >= 12 don't have a setting for - * PTE and those platforms except TGL/RKL will be initialized L3 WB to - * catch accidental use of reserved and unused mocs indexes. + * Entries not part of the following tables are undefined as far as userspace is + * concerned and shouldn't be relied upon. The last few entries are reserved by + * the hardware. They should be initialized according to bspec and never used. * - * The last few entries are reserved by the hardware. For ICL+ they - * should be initialized according to bspec and never used, for older - * platforms they should never be written to. + * NOTE1: These tables are part of bspec and defined as part of the hardware + * interface. It is expected that, for specific hardware platform, existing + * entries will remain constant and the table will only be updated by adding new + * entries, filling unused positions. * - * NOTE1: These tables are part of bspec and defined as part of hardware - * interface for ICL+. For older platforms, they are part of kernel - * ABI. It is expected that, for specific hardware platform, existing - * entries will remain constant and the table will only be updated by - * adding new entries, filling unused positions. - * - * NOTE2: For GEN >= 12 except TGL and RKL, reserved and unspecified MOCS - * indices have been set to L3 WB. These reserved entries should never - * be used, they may be changed to low performant variants with better - * coherency in the future if more entries are needed. - * For TGL/RKL, all the unspecified MOCS indexes are mapped to L3 UC. + * NOTE2: Reserved and unspecified MOCS indices have been set to L3 WB. These + * reserved entries should never be used. They may be changed to low performant + * variants with better coherency in the future if more entries are needed. */ static const struct xe_mocs_entry gen12_mocs_desc[] = { |