Re: [PATCH 1/2] lib/xe/xe_ggtt: Extract generic GGTT code into library

On 7/30/2026 11:38 AM, Lukasz Laguna wrote:
> Add a shared xe_ggtt library with a common GGTT definitions, including
> bitfields, bitmasks and helpers.
>
> Signed-off-by: Lukasz Laguna <[email protected]>
> ---
>   lib/meson.build            |  1 +
>   lib/xe/xe_ggtt.c           | 22 ++++++++++++++++++++++
>   lib/xe/xe_ggtt.h           | 21 +++++++++++++++++++++
>   lib/xe/xe_mmio.h           |  3 +--
>   tests/intel/xe_sriov_flr.c | 31 ++++++++++++++++---------------
>   5 files changed, 61 insertions(+), 17 deletions(-)
>   create mode 100644 lib/xe/xe_ggtt.c
>   create mode 100644 lib/xe/xe_ggtt.h
>
> diff --git a/lib/meson.build b/lib/meson.build
> index 12d78de20..3001b473e 100644
> --- a/lib/meson.build
> +++ b/lib/meson.build
> @@ -126,6 +126,7 @@ lib_sources = [
>   	'igt_msm.c',
>   	'igt_dsc.c',
>   	'igt_hook.c',
> +	'xe/xe_ggtt.c',
>   	'xe/xe_gt.c',
>   	'xe/xe_ioctl.c',
>   	'xe/xe_legacy.c',
> diff --git a/lib/xe/xe_ggtt.c b/lib/xe/xe_ggtt.c
> new file mode 100644
> index 000000000..96b189b7a
> --- /dev/null
> +++ b/lib/xe/xe_ggtt.c
> @@ -0,0 +1,22 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright(c) 2026 Intel Corporation. All rights reserved.
> + */
> +
> +#include "igt.h"
> +#include "xe/xe_ggtt.h"
> +
> +xe_ggtt_pte_mask_t xe_ggtt_get_gpa_mask(int pf_fd)
> +{
> +	if (IS_TIGERLAKE(intel_get_drm_devid(pf_fd)))
> +		return TGL_GGTT_PTE_ADDR_MASK;
> +
> +	return GGTT_PTE_ADDR_MASK;
> +}
> +
> +uint64_t xe_ggtt_pte_get_gpa(int pf_fd, xe_ggtt_pte_t pte)
> +{
> +	xe_ggtt_pte_mask_t mask = xe_ggtt_get_gpa_mask(pf_fd);
> +
> +	return (uint64_t)((pte & mask) >> GGTT_PTE_ADDR_SHIFT);
> +}
> diff --git a/lib/xe/xe_ggtt.h b/lib/xe/xe_ggtt.h
> new file mode 100644
> index 000000000..5e4038591
> --- /dev/null
> +++ b/lib/xe/xe_ggtt.h
> @@ -0,0 +1,21 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * Copyright(c) 2026 Intel Corporation. All rights reserved.
> + */
> +
> +#ifndef __XE_GGTT_H__
> +#define __XE_GGTT_H__
> +
> +#include <stdint.h>
> +
> +#define GGTT_PTE_ADDR_MASK		GENMASK_ULL(45, 12)
> +#define TGL_GGTT_PTE_ADDR_MASK		GENMASK_ULL(38, 12)
> +#define   GGTT_PTE_ADDR_SHIFT		12
> +
> +typedef uint64_t xe_ggtt_pte_t;
> +typedef uint64_t xe_ggtt_pte_mask_t;
> +
> +xe_ggtt_pte_mask_t xe_ggtt_get_gpa_mask(int pf_fd);
> +uint64_t xe_ggtt_pte_get_gpa(int pf_fd, xe_ggtt_pte_t pte);
> +
> +#endif /* __XE_GGTT_H__ */
> diff --git a/lib/xe/xe_mmio.h b/lib/xe/xe_mmio.h
> index 030c50a2e..65aea65ea 100644
> --- a/lib/xe/xe_mmio.h
> +++ b/lib/xe/xe_mmio.h
> @@ -5,6 +5,7 @@
>   
>   #include "lib/intel_io.h"
>   #include "lib/igt_sizes.h"
> +#include "lib/xe/xe_ggtt.h"
>   
>   #ifndef XE_MMIO_H
>   #define XE_MMIO_H
> @@ -12,8 +13,6 @@
>   #define TILE_MMIO_SIZE		SZ_16M
>   #define GGTT_OFFSET_IN_TILE	SZ_8M
>   
> -typedef uint64_t xe_ggtt_pte_t;
> -
>   struct xe_mmio {
>   	int fd;
>   	bool init;
> diff --git a/tests/intel/xe_sriov_flr.c b/tests/intel/xe_sriov_flr.c
> index bb702d354..556979d7b 100644
> --- a/tests/intel/xe_sriov_flr.c
> +++ b/tests/intel/xe_sriov_flr.c
> @@ -16,6 +16,7 @@
>   #include "intel_chipset.h"
>   #include "intel_vram.h"
>   #include "linux_scaffold.h"
> +#include "xe/xe_ggtt.h"
>   #include "xe/xe_mmio.h"
>   #include "xe/xe_query.h"
>   #include "xe/xe_sriov_provisioning.h"
> @@ -646,8 +647,6 @@ static int execute_parallel_flr_twice(int pf_fd, int num_vfs,
>   }
>   
>   #define GEN12_VF_CAP_REG			0x1901f8
> -#define GGTT_PTE_TEST_FIELD_MASK		GENMASK_ULL(19, 12)
> -#define GGTT_PTE_ADDR_SHIFT			12
>   
>   struct ggtt_ops {
>   	void (*set_pte)(struct xe_mmio *mmio, uint8_t tile, uint32_t pte_offset, xe_ggtt_pte_t pte);
> @@ -693,26 +692,21 @@ static void intel_mtl_set_pte(struct xe_mmio *mmio, uint8_t tile,
>   static bool set_pte_gpa(struct ggtt_ops *ggtt, struct xe_mmio *mmio, uint8_t tile,
>   			uint32_t pte_offset, uint8_t gpa, xe_ggtt_pte_t *out)
>   {
> +	xe_ggtt_pte_mask_t mask = xe_ggtt_get_gpa_mask(mmio->fd);
>   	xe_ggtt_pte_t pte;
>   
>   	pte = ggtt->get_pte(mmio, tile, pte_offset);
> -	pte &= ~GGTT_PTE_TEST_FIELD_MASK;
> -	pte |= ((xe_ggtt_pte_t)gpa << GGTT_PTE_ADDR_SHIFT) & GGTT_PTE_TEST_FIELD_MASK;
> +	pte &= ~mask;
> +	pte |= ((xe_ggtt_pte_t)gpa << GGTT_PTE_ADDR_SHIFT) & mask;
>   	ggtt->set_pte(mmio, tile, pte_offset, pte);
>   	*out = ggtt->get_pte(mmio, tile, pte_offset);
>   
>   	return *out == pte;
>   }
>   
> -static bool check_pte_gpa(struct ggtt_ops *ggtt, struct xe_mmio *mmio, uint8_t tile,
> -			  uint32_t pte_offset, uint8_t expected_gpa, xe_ggtt_pte_t *out)
> +static bool check_pte_gpa(int pf_fd, xe_ggtt_pte_t pte, uint8_t expected)
>   {
> -	uint8_t val;
> -
> -	*out = ggtt->get_pte(mmio, tile, pte_offset);
> -	val = (uint8_t)((*out & GGTT_PTE_TEST_FIELD_MASK) >> GGTT_PTE_ADDR_SHIFT);
> -
> -	return val == expected_gpa;
> +	return (xe_ggtt_pte_get_gpa(pf_fd, pte) == expected);
>   }
>   
>   static int populate_ggtt_pte_offsets(struct ggtt_data *gdata)
> @@ -817,17 +811,24 @@ static void ggtt_subcheck_prepare_vf(int vf_id, struct subcheck_data *data)
>   static void ggtt_subcheck_verify_vf(int vf_id, int flr_vf_id, struct subcheck_data *data)
>   {
>   	struct ggtt_data *gdata = (struct ggtt_data *)data;
> -	uint8_t expected = (vf_id == flr_vf_id) ? 0 : vf_id;
>   	struct xe_mmio *mmio = xe_mmio_for_vf(0);
> +	int pf_fd = gdata->base.pf_fd;
>   	xe_ggtt_pte_t pte;
>   	uint32_t pte_offset;
> +	bool failed = false;
>   
>   	if (data->stop_reason)
>   		return;
>   
>   	for_each_pte_offset(pte_offset, &gdata->pte_offsets[vf_id]) {
> -		if (!check_pte_gpa(&gdata->ggtt, mmio, data->tile, pte_offset,
> -				   expected, &pte)) {
> +		pte = gdata->ggtt.get_pte(mmio, data->tile, pte_offset);
> +
> +		if (!check_pte_gpa(pf_fd, pte, (vf_id == flr_vf_id) ? 0 : vf_id)) {
> +			igt_debug("Wrong GGTT GPA on VF%u after VF%u FLR\n", vf_id, flr_vf_id);
> +			failed = true;
> +		}
> +
> +		if (failed) {


LGTM,

Reviewed-by: Marcin Bernatowicz <[email protected]>

>   			set_fail_reason(data,
>   					"GGTT check after VF%u FLR failed on VF%u: Read PTE: %#" PRIx64 " at offset: %#x\n",
>   					flr_vf_id, vf_id, pte, pte_offset);