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drm: debugfs: provide infrastructure to dump a DRM GPU VA space

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This commit adds a function to dump a DRM GPU VA space and a macro for
drivers to register the struct drm_info_list 'gpuvas' entry.

Most likely, most drivers might maintain one DRM GPU VA space per struct
drm_file, but there might also be drivers not having a fixed relation
between DRM GPU VA spaces and a DRM core infrastructure, hence we need the
indirection via the driver iterating it's maintained DRM GPU VA spaces.

Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230720001443.2380-3-dakr@redhat.com
This commit is contained in:
Danilo Krummrich 2023-07-20 02:14:23 +02:00
parent e6303f323b
commit 4f66feeab1
2 changed files with 65 additions and 0 deletions
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40
drivers/gpu/drm/drm_debugfs.c
View File

@ -39,6 +39,7 @@
#include <drm/drm_file.h>
#include <drm/drm_gem.h>
#include <drm/drm_managed.h>
#include <drm/drm_gpuva_mgr.h>
#include "drm_crtc_internal.h"
#include "drm_internal.h"
@ -175,6 +176,45 @@ static const struct file_operations drm_debugfs_fops = {
.release = single_release,
};
/**
* drm_debugfs_gpuva_info - dump the given DRM GPU VA space
* @m: pointer to the &seq_file to write
* @mgr: the &drm_gpuva_manager representing the GPU VA space
*
* Dumps the GPU VA mappings of a given DRM GPU VA manager.
*
* For each DRM GPU VA space drivers should call this function from their
* &drm_info_list's show callback.
*
* Returns: 0 on success, -ENODEV if the &mgr is not initialized
*/
int drm_debugfs_gpuva_info(struct seq_file *m,
struct drm_gpuva_manager *mgr)
{
struct drm_gpuva *va, *kva = &mgr->kernel_alloc_node;
if (!mgr->name)
return -ENODEV;
seq_printf(m, "DRM GPU VA space (%s) [0x%016llx;0x%016llx]\n",
mgr->name, mgr->mm_start, mgr->mm_start + mgr->mm_range);
seq_printf(m, "Kernel reserved node [0x%016llx;0x%016llx]\n",
kva->va.addr, kva->va.addr + kva->va.range);
seq_puts(m, "\n");
seq_puts(m, " VAs | start | range | end | object | object offset\n");
seq_puts(m, "-------------------------------------------------------------------------------------------------------------\n");
drm_gpuva_for_each_va(va, mgr) {
if (unlikely(va == kva))
continue;
seq_printf(m, " | 0x%016llx | 0x%016llx | 0x%016llx | 0x%016llx | 0x%016llx\n",
va->va.addr, va->va.range, va->va.addr + va->va.range,
(u64)va->gem.obj, va->gem.offset);
}
return 0;
}
EXPORT_SYMBOL(drm_debugfs_gpuva_info);
/**
* drm_debugfs_create_files - Initialize a given set of debugfs files for DRM

25
include/drm/drm_debugfs.h
View File

@ -34,6 +34,22 @@
#include <linux/types.h>
#include <linux/seq_file.h>
#include <drm/drm_gpuva_mgr.h>
/**
* DRM_DEBUGFS_GPUVA_INFO - &drm_info_list entry to dump a GPU VA space
* @show: the &drm_info_list's show callback
* @data: driver private data
*
* Drivers should use this macro to define a &drm_info_list entry to provide a
* debugfs file for dumping the GPU VA space regions and mappings.
*
* For each DRM GPU VA space drivers should call drm_debugfs_gpuva_info() from
* their @show callback.
*/
#define DRM_DEBUGFS_GPUVA_INFO(show, data) {"gpuvas", show, DRIVER_GEM_GPUVA, data}
/**
* struct drm_info_list - debugfs info list entry
*
@ -134,6 +150,9 @@ void drm_debugfs_add_file(struct drm_device *dev, const char *name,
void drm_debugfs_add_files(struct drm_device *dev,
const struct drm_debugfs_info *files, int count);
int drm_debugfs_gpuva_info(struct seq_file *m,
struct drm_gpuva_manager *mgr);
#else
static inline void drm_debugfs_create_files(const struct drm_info_list *files,
int count, struct dentry *root,
@ -155,6 +174,12 @@ static inline void drm_debugfs_add_files(struct drm_device *dev,
const struct drm_debugfs_info *files,
int count)
{}
static inline int drm_debugfs_gpuva_info(struct seq_file *m,
struct drm_gpuva_manager *mgr)
{
return 0;
}
#endif
#endif /* _DRM_DEBUGFS_H_ */