/* * Provide mapping between PCI's revision ID to the individual GMD * (Graphics/Media/Display) stepping values that can be compared numerically. * * Some platforms may have unusual ways of mapping PCI revision ID to GMD * steppings. E.g., in some cases a higher PCI revision may translate to a * lower stepping of the GT and/or display IP. * * Also note that some revisions/steppings may have been set aside as * placeholders but never materialized in real hardware; in those cases there * may be jumps in the revision IDs or stepping values in the tables below.
*/
/* * Some platforms always have the same stepping value for GT and display; * use a macro to define these to make it easier to identify the platforms * where the two steppings can deviate.
*/ #define COMMON_STEP(x_) \
.graphics = STEP_##x_, \
.media = STEP_##x_
__diag_push();
__diag_ignore_all("-Woverride-init", "Allow field overrides in table");
/* Same GT stepping between tgl_uy_revids and tgl_revids don't mean the same HW */ staticconststruct xe_step_info tgl_revids[] = {
[0] = { COMMON_STEP(A0) },
[1] = { COMMON_STEP(B0) },
};
/** * xe_step_pre_gmdid_get - Determine IP steppings from PCI revid * @xe: Xe device * * Convert the PCI revid into proper IP steppings. This should only be * used on platforms that do not have GMD_ID support.
*/ struct xe_step_info xe_step_pre_gmdid_get(struct xe_device *xe)
{ conststruct xe_step_info *revids = NULL; struct xe_step_info step = {};
u16 revid = xe->info.revid; int size = 0; constint *basedie_info = NULL; int basedie_size = 0; int baseid = 0;
/* * If we hit a gap in the revid array, use the information for * the next revid. * * This may be wrong in all sorts of ways, especially if the * steppings in the array are not monotonically increasing, but * it's better than defaulting to 0.
*/ while (revid < size && revids[revid].graphics == STEP_NONE)
revid++;
/** * xe_step_gmdid_get - Determine IP steppings from GMD_ID revid fields * @xe: Xe device * @graphics_gmdid_revid: value of graphics GMD_ID register's revid field * @media_gmdid_revid: value of media GMD_ID register's revid field * * Convert the revid fields of the GMD_ID registers into proper IP steppings. * * GMD_ID revid values are currently expected to have consistent meanings on * all platforms: major steppings (A0, B0, etc.) are 4 apart, with minor * steppings (A1, A2, etc.) taking the values in between.
*/ struct xe_step_info xe_step_gmdid_get(struct xe_device *xe,
u32 graphics_gmdid_revid,
u32 media_gmdid_revid)
{ struct xe_step_info step = {
.graphics = STEP_A0 + graphics_gmdid_revid,
.media = STEP_A0 + media_gmdid_revid,
};
if (step.graphics >= STEP_FUTURE) {
step.graphics = STEP_FUTURE;
drm_dbg(&xe->drm, "Graphics GMD_ID revid value %d treated as future stepping\n",
graphics_gmdid_revid);
}
if (step.media >= STEP_FUTURE) {
step.media = STEP_FUTURE;
drm_dbg(&xe->drm, "Media GMD_ID revid value %d treated as future stepping\n",
media_gmdid_revid);
}
return step;
}
#define STEP_NAME_CASE(name) \ case STEP_##name: \ return#name;
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