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drm/xe/guc: Add basic KLV encoding helpers

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We plan to encode more data as KLVs. Add helpers for that.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
Link: https://patch.msgid.link/20260707220816.677-4-michal.wajdeczko@intel.com
This commit is contained in:
Michal Wajdeczko 2026-07-08 00:08:05 +02:00
parent 961826fbcd
commit ac95833097
2 changed files with 59 additions and 0 deletions
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56
drivers/gpu/drm/xe/xe_guc_klv_helpers.c
View File

@ -189,3 +189,59 @@ int xe_guc_klv_count(const u32 *klvs, u32 num_dwords)
return num_dwords ? -ENODATA : num_klvs;
}
static u16 to_num_dwords(size_t size)
{
return round_up(size, sizeof(u32)) / sizeof(u32);
}
/**
* xe_guc_klv_encode_u32() - Encode 32-bit value as KLV.
* @klvs: the buffer where to place KLV
* @avail: number of dwords (u32) available in the buffer
* @key: key to be used
* @value: value to be encoded
*
* 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_u32(u32 *klvs, u32 avail, u16 key, u32 value)
{
u16 len = to_num_dwords(sizeof(u32));
if (IS_ERR(klvs))
return klvs;
if (avail < GUC_KLV_LEN_MIN + len)
return ERR_PTR(-ENOSPC);
*klvs++ = PREP_GUC_KLV(key, len);
*klvs++ = value;
return klvs;
}
/**
* xe_guc_klv_encode_u64() - Encode 64-bit value as KLV.
* @klvs: the buffer where to place KLV
* @avail: number of dwords (u32) available in the buffer
* @key: key to be used
* @value: value to be encoded
*
* 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_u64(u32 *klvs, u32 avail, u16 key, u64 value)
{
u16 len = to_num_dwords(sizeof(u64));
if (IS_ERR(klvs))
return klvs;
if (avail < GUC_KLV_LEN_MIN + len)
return ERR_PTR(-ENOSPC);
*klvs++ = PREP_GUC_KLV(key, len);
*klvs++ = lower_32_bits(value);
*klvs++ = upper_32_bits(value);
return klvs;
}

3
drivers/gpu/drm/xe/xe_guc_klv_helpers.h
View File

@ -17,6 +17,9 @@ void xe_guc_klv_print_one(u16 key, u16 len, const u32 *value, struct drm_printer
void xe_guc_klv_print(const u32 *klvs, u32 num_dwords, struct drm_printer *p);
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);
/**
* PREP_GUC_KLV - Prepare KLV header value based on provided key and len.
* @key: KLV key