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drm/xe/pf: Populate SR-IOV debugfs tree with tiles

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Populate new per SR-IOV function debugfs directories with next
level directories that represent tiles. There are no files yet,
but we will continue updating that tree in upcoming patches.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://lore.kernel.org/r/20250928140029.198847-4-michal.wajdeczko@intel.com
This commit is contained in:
Michal Wajdeczko
2025-09-28 16:00:25 +02:00
parent 4d4af0d6cb
commit 5489e7d44a
4 changed files with 129 additions and 1 deletions
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98
drivers/gpu/drm/xe/xe_tile_sriov_pf_debugfs.c Normal file
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// SPDX-License-Identifier: MIT
/*
* Copyright © 2025 Intel Corporation
*/
#include <linux/debugfs.h>
#include <drm/drm_debugfs.h>
#include "xe_device_types.h"
#include "xe_tile_sriov_pf_debugfs.h"
#include "xe_sriov.h"
/*
* /sys/kernel/debug/dri/BDF/
* ├── sriov # d_inode->i_private = (xe_device*)
* │ ├── pf # d_inode->i_private = (xe_device*)
* │ │ ├── tile0 # d_inode->i_private = (xe_tile*)
* │ │ ├── tile1
* │ │ : :
* │ ├── vf1 # d_inode->i_private = VFID(1)
* │ │ ├── tile0 # d_inode->i_private = (xe_tile*)
* │ │ ├── tile1
* │ │ : :
* │ ├── vfN # d_inode->i_private = VFID(N)
* │ │ ├── tile0 # d_inode->i_private = (xe_tile*)
* │ │ ├── tile1
* : : : :
*/
static void *extract_priv(struct dentry *d)
{
return d->d_inode->i_private;
}
__maybe_unused
static struct xe_tile *extract_tile(struct dentry *d)
{
return extract_priv(d);
}
static struct xe_device *extract_xe(struct dentry *d)
{
return extract_priv(d->d_parent->d_parent);
}
__maybe_unused
static unsigned int extract_vfid(struct dentry *d)
{
void *pp = extract_priv(d->d_parent);
return pp == extract_xe(d) ? PFID : (uintptr_t)pp;
}
/**
* xe_tile_sriov_pf_debugfs_populate() - Populate SR-IOV debugfs tree with tile files.
* @tile: the &xe_tile to register
* @parent: the parent &dentry that represents the SR-IOV @vfid function
* @vfid: the VF identifier
*
* Add to the @parent directory new debugfs directory that will represent a @tile and
* populate it with files that are related to the SR-IOV @vfid function.
*
* This function can only be called on PF.
*/
void xe_tile_sriov_pf_debugfs_populate(struct xe_tile *tile, struct dentry *parent,
unsigned int vfid)
{
struct xe_device *xe = tile->xe;
struct dentry *dent;
char name[10]; /* should be enough up to "tile%u\0" for 2^16 - 1 */
xe_tile_assert(tile, IS_SRIOV_PF(xe));
xe_tile_assert(tile, extract_priv(parent->d_parent) == xe);
xe_tile_assert(tile, extract_priv(parent) == tile->xe ||
(uintptr_t)extract_priv(parent) == vfid);
/*
* /sys/kernel/debug/dri/BDF/
* ├── sriov
* │ ├── pf # parent, d_inode->i_private = (xe_device*)
* │ │ ├── tile0 # d_inode->i_private = (xe_tile*)
* │ │ ├── tile1
* │ │ : :
* │ ├── vf1 # parent, d_inode->i_private = VFID(1)
* │ │ ├── tile0 # d_inode->i_private = (xe_tile*)
* │ │ ├── tile1
* : : : :
*/
snprintf(name, sizeof(name), "tile%u", tile->id);
dent = debugfs_create_dir(name, parent);
if (IS_ERR(dent))
return;
dent->d_inode->i_private = tile;
xe_tile_assert(tile, extract_tile(dent) == tile);
xe_tile_assert(tile, extract_vfid(dent) == vfid);
xe_tile_assert(tile, extract_xe(dent) == xe);
}