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drm/xe/guc: Add object KLV encoding helper

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We plan to encode larger objects as single KLV or set of KLVs.
Add helper for that.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
Link: https://patch.msgid.link/20260707220816.677-6-michal.wajdeczko@intel.com
This commit is contained in:
Michal Wajdeczko
2026-07-08 00:08:07 +02:00
parent a408338d10
commit b088da0303
2 changed files with 41 additions and 0 deletions
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39
drivers/gpu/drm/xe/xe_guc_klv_helpers.c
View File

@@ -280,3 +280,42 @@ u32 *xe_guc_klv_encode_string(u32 *klvs, u32 avail, u16 key, const char *s)
strscpy_pad((void *)klvs, s, to_num_bytes(len));
return klvs + len;
}
/**
* xe_guc_klv_encode_object() - Encode object using custom encoder as single KLV.
* @klvs: the buffer where to place KLV
* @avail: number of dwords (u32) available in the buffer
* @key: key to be used
* @obj: opaque object pointer
* @encoder: function pointer to the custom encoder
*
* Return: pointer to the buffer location past the encoded KLV or
* an ERR_PTR if there was no space to encode the KLV.
*/
u32 *xe_guc_klv_encode_object(u32 *klvs, u32 avail, u16 key, const void *obj,
u32 *(*encoder)(u32 *klvs, u32 avail, const void *obj))
{
u32 *end;
if (IS_ERR(klvs))
return klvs;
if (avail < GUC_KLV_LEN_MIN)
return ERR_PTR(-ENOSPC);
if (avail > GUC_KLV_LEN_MIN + FIELD_MAX(GUC_KLV_0_LEN))
avail = GUC_KLV_LEN_MIN + FIELD_MAX(GUC_KLV_0_LEN);
end = encoder(klvs + GUC_KLV_LEN_MIN, avail - GUC_KLV_LEN_MIN, obj);
if (IS_ERR(end))
return end;
if (WARN_ON(end < klvs + GUC_KLV_LEN_MIN))
return ERR_PTR(-EPIPE);
if (WARN_ON(end > klvs + avail))
return ERR_PTR(-EFBIG);
*klvs = PREP_GUC_KLV(key, end - (klvs + GUC_KLV_LEN_MIN));
return end;
}

2
drivers/gpu/drm/xe/xe_guc_klv_helpers.h
View File

@@ -20,6 +20,8 @@ int xe_guc_klv_count(const u32 *klvs, u32 num_dwords);
u32 *xe_guc_klv_encode_u32(u32 *klvs, u32 avail, u16 key, u32 value);
u32 *xe_guc_klv_encode_u64(u32 *klvs, u32 avail, u16 key, u64 value);
u32 *xe_guc_klv_encode_string(u32 *klvs, u32 avail, u16 key, const char *s);
u32 *xe_guc_klv_encode_object(u32 *klvs, u32 avail, u16 key, const void *obj,
u32 *(*encoder)(u32 *klvs, u32 avail, const void *obj));
/**
* PREP_GUC_KLV - Prepare KLV header value based on provided key and len.