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// SPDX-License-Identifier: MIT
/*
* Copyright © 2025 Intel Corporation
*/
#include "abi/guc_actions_abi.h"
#include "xe_guc.h"
#include "xe_guc_ct.h"
#include "xe_guc_pagefault.h"
#include "xe_pagefault.h"
static void guc_ack_fault(struct xe_pagefault *pf, int err)
{
u32 vfid = FIELD_GET(PFD_VFID, pf->producer.msg[2]);
u32 engine_instance = FIELD_GET(PFD_ENG_INSTANCE, pf->producer.msg[0]);
u32 engine_class = FIELD_GET(PFD_ENG_CLASS, pf->producer.msg[0]);
u32 pdata = FIELD_GET(PFD_PDATA_LO, pf->producer.msg[0]) |
(FIELD_GET(PFD_PDATA_HI, pf->producer.msg[1]) <<
PFD_PDATA_HI_SHIFT);
u32 action[] = {
XE_GUC_ACTION_PAGE_FAULT_RES_DESC,
FIELD_PREP(PFR_VALID, 1) |
FIELD_PREP(PFR_SUCCESS, !!err) |
FIELD_PREP(PFR_REPLY, PFR_ACCESS) |
FIELD_PREP(PFR_DESC_TYPE, FAULT_RESPONSE_DESC) |
FIELD_PREP(PFR_ASID, pf->consumer.asid),
FIELD_PREP(PFR_VFID, vfid) |
FIELD_PREP(PFR_ENG_INSTANCE, engine_instance) |
FIELD_PREP(PFR_ENG_CLASS, engine_class) |
FIELD_PREP(PFR_PDATA, pdata),
};
struct xe_guc *guc = pf->producer.private;
xe_guc_ct_send(&guc->ct, action, ARRAY_SIZE(action), 0, 0);
}
static const struct xe_pagefault_ops guc_pagefault_ops = {
.ack_fault = guc_ack_fault,
};
/**
* xe_guc_pagefault_handler() - G2H page fault handler
* @guc: GuC object
* @msg: G2H message
* @len: Length of G2H message
*
* Parse GuC to host (G2H) message into a struct xe_pagefault and forward onto
* the Xe page fault layer.
*
* Return: 0 on success, errno on failure
*/
int xe_guc_pagefault_handler(struct xe_guc *guc, u32 *msg, u32 len)
{
struct xe_pagefault pf;
int i;
#define GUC_PF_MSG_LEN_DW \
(sizeof(struct xe_guc_pagefault_desc) / sizeof(u32))
BUILD_BUG_ON(GUC_PF_MSG_LEN_DW > XE_PAGEFAULT_PRODUCER_MSG_LEN_DW);
if (len != GUC_PF_MSG_LEN_DW)
return -EPROTO;
pf.gt = guc_to_gt(guc);
/*
* XXX: These values happen to match the enum in xe_pagefault_types.h.
* If that changes, we’ll need to remap them here.
*/
pf.consumer.page_addr = ((u64)FIELD_GET(PFD_VIRTUAL_ADDR_HI, msg[3])
<< PFD_VIRTUAL_ADDR_HI_SHIFT) |
(FIELD_GET(PFD_VIRTUAL_ADDR_LO, msg[2]) <<
PFD_VIRTUAL_ADDR_LO_SHIFT);
pf.consumer.asid = FIELD_GET(PFD_ASID, msg[1]);
pf.consumer.access_type = FIELD_GET(PFD_ACCESS_TYPE, msg[2]);
pf.consumer.fault_type = FIELD_GET(PFD_FAULT_TYPE, msg[2]);
if (FIELD_GET(XE2_PFD_TRVA_FAULT, msg[0]))
pf.consumer.fault_level = XE_PAGEFAULT_LEVEL_NACK;
else
pf.consumer.fault_level = FIELD_GET(PFD_FAULT_LEVEL, msg[0]);
pf.consumer.engine_class = FIELD_GET(PFD_ENG_CLASS, msg[0]);
pf.consumer.engine_instance = FIELD_GET(PFD_ENG_INSTANCE, msg[0]);
pf.producer.private = guc;
pf.producer.ops = &guc_pagefault_ops;
for (i = 0; i < GUC_PF_MSG_LEN_DW; ++i)
pf.producer.msg[i] = msg[i];
#undef GUC_PF_MSG_LEN_DW
return xe_pagefault_handler(guc_to_xe(guc), &pf);
}
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