Commit 0e72241a authored by Lukasz Laguna's avatar Lukasz Laguna Committed by Michal Wajdeczko
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drm/xe/pf: Configure LMTT in MERT 



On platforms with standalone MERT, the PF driver needs to program LMTT
in MERT's LMEM_CFG register.

Signed-off-by: default avatarLukasz Laguna <lukasz.laguna@intel.com>
Reviewed-by: default avatarPiotr Piórkowski <piotr.piorkowski@intel.com>
Signed-off-by: default avatarMichal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patch.msgid.link/20251124190237.20503-3-lukasz.laguna@intel.com
parent 79cb005c

drivers/gpu/drm/xe/regs/xe_mert_regs.h

0 → 100644
+13 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: MIT */

/*

 * Copyright © 2025 Intel Corporation

 */



#ifndef _XE_MERT_REGS_H_

#define _XE_MERT_REGS_H_



#include "regs/xe_reg_defs.h"



#define MERT_LMEM_CFG				XE_REG(0x1448b0)



#endif /* _XE_MERT_REGS_H_ */

drivers/gpu/drm/xe/xe_lmtt.c

+9 −1
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
#include <drm/drm_managed.h>



#include "regs/xe_gt_regs.h"

#include "regs/xe_mert_regs.h"



#include "xe_assert.h"

#include "xe_bo.h"
@@ -17,6 +18,7 @@ 
#include "xe_mmio.h"

#include "xe_res_cursor.h"

#include "xe_sriov.h"

#include "xe_tile.h"

#include "xe_tile_sriov_printk.h"



/**
@@ -196,16 +198,22 @@ static void lmtt_setup_dir_ptr(struct xe_lmtt *lmtt) 
	struct xe_device *xe = tile_to_xe(tile);

	dma_addr_t offset = xe_bo_main_addr(lmtt->pd->bo, XE_PAGE_SIZE);

	struct xe_gt *gt;

	u32 config;

	u8 id;



	lmtt_debug(lmtt, "DIR offset %pad\n", &offset);

	lmtt_assert(lmtt, xe_bo_is_vram(lmtt->pd->bo));

	lmtt_assert(lmtt, IS_ALIGNED(offset, SZ_64K));



	config = LMEM_EN | REG_FIELD_PREP(LMTT_DIR_PTR, offset / SZ_64K);



	for_each_gt_on_tile(gt, tile, id)

		xe_mmio_write32(&gt->mmio,

				GRAPHICS_VER(xe) >= 20 ? XE2_LMEM_CFG : LMEM_CFG,

				LMEM_EN | REG_FIELD_PREP(LMTT_DIR_PTR, offset / SZ_64K));

				config);



	if (xe_device_has_mert(xe) && xe_tile_is_root(tile))

		xe_mmio_write32(&tile->mmio, MERT_LMEM_CFG, config);

}



/**