On Wed, 23 Jun 2021 at 20:15, Daniel Vetter <daniel@xxxxxxxx> wrote:
>
> On Wed, Jun 23, 2021 at 06:27:06PM +0100, Matthew Auld wrote:
> > Looks like it got lost along the way, so add it back. This is needed for
> > the region query uAPI where we want to report a snapshot of how much
> > lmem is available.
> >
> > This time around let's push it directly into the allocator, which
> > simplifies things, like not having to care about internal fragmentation,
> > or having to remember to track things for all possible interfaces that
> > might want to allocate or reserve pages.
> >
> > v2(Thomas): add some more kernel doc
> >
> > Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
> > Cc: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
> > Reviewed-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
>
> Since this is uapi, do umds use this? Or just igt?
>
> Please record both the umd user for this and the igts that verifies this
> is not nonsense to the commit message. We need to be much better with
> keeping records for our uapi additions, there's been some really badly
> justified uapi in the past that turned out to be for testcases only.
For the userspace justification, I pinged you and Jason about that in
the previous thread, since it's not completely clear if real userspace
even cares about this. I can maybe just limit it to debugfs?
> -Daniel
>
> > ---
> > drivers/gpu/drm/i915/i915_buddy.c | 6 ++++++
> > drivers/gpu/drm/i915/i915_buddy.h | 1 +
> > drivers/gpu/drm/i915/i915_debugfs.c | 5 +++--
> > drivers/gpu/drm/i915/i915_query.c | 2 +-
> > drivers/gpu/drm/i915/i915_ttm_buddy_manager.c | 13 +++++++++++++
> > drivers/gpu/drm/i915/i915_ttm_buddy_manager.h | 2 ++
> > drivers/gpu/drm/i915/intel_memory_region.c | 15 +++++++++++++++
> > drivers/gpu/drm/i915/intel_memory_region.h | 4 ++++
> > 8 files changed, 45 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_buddy.c b/drivers/gpu/drm/i915/i915_buddy.c
> > index 29dd7d0310c1..27cd2487a18f 100644
> > --- a/drivers/gpu/drm/i915/i915_buddy.c
> > +++ b/drivers/gpu/drm/i915/i915_buddy.c
> > @@ -80,6 +80,7 @@ int i915_buddy_init(struct i915_buddy_mm *mm, u64 size, u64 chunk_size)
> > size = round_down(size, chunk_size);
> >
> > mm->size = size;
> > + mm->avail = size;
> > mm->chunk_size = chunk_size;
> > mm->max_order = ilog2(size) - ilog2(chunk_size);
> >
> > @@ -159,6 +160,8 @@ void i915_buddy_fini(struct i915_buddy_mm *mm)
> > i915_block_free(mm, mm->roots[i]);
> > }
> >
> > + GEM_WARN_ON(mm->avail != mm->size);
> > +
> > kfree(mm->roots);
> > kfree(mm->free_list);
> > kmem_cache_destroy(mm->slab_blocks);
> > @@ -235,6 +238,7 @@ void i915_buddy_free(struct i915_buddy_mm *mm,
> > struct i915_buddy_block *block)
> > {
> > GEM_BUG_ON(!i915_buddy_block_is_allocated(block));
> > + mm->avail += i915_buddy_block_size(mm, block);
> > __i915_buddy_free(mm, block);
> > }
> >
> > @@ -288,6 +292,7 @@ i915_buddy_alloc(struct i915_buddy_mm *mm, unsigned int order)
> > }
> >
> > mark_allocated(block);
> > + mm->avail -= i915_buddy_block_size(mm, block);
> > kmemleak_update_trace(block);
> > return block;
> >
> > @@ -373,6 +378,7 @@ int i915_buddy_alloc_range(struct i915_buddy_mm *mm,
> > }
> >
> > mark_allocated(block);
> > + mm->avail -= i915_buddy_block_size(mm, block);
> > list_add_tail(&block->link, &allocated);
> > continue;
> > }
> > diff --git a/drivers/gpu/drm/i915/i915_buddy.h b/drivers/gpu/drm/i915/i915_buddy.h
> > index 37f8c42071d1..feb7c1bb6244 100644
> > --- a/drivers/gpu/drm/i915/i915_buddy.h
> > +++ b/drivers/gpu/drm/i915/i915_buddy.h
> > @@ -70,6 +70,7 @@ struct i915_buddy_mm {
> > /* Must be at least PAGE_SIZE */
> > u64 chunk_size;
> > u64 size;
> > + u64 avail;
> > };
> >
> > static inline u64
> > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> > index cc745751ac53..4765f220469e 100644
> > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > @@ -246,8 +246,9 @@ static int i915_gem_object_info(struct seq_file *m, void *data)
> > atomic_read(&i915->mm.free_count),
> > i915->mm.shrink_memory);
> > for_each_memory_region(mr, i915, id)
> > - seq_printf(m, "%s: total:%pa, available:%pa bytes\n",
> > - mr->name, &mr->total, &mr->avail);
> > + seq_printf(m, "%s: total:%pa, available:%llu bytes\n",
> > + mr->name, &mr->total,
> > + intel_memory_region_get_avail(mr));
> >
> > return 0;
> > }
> > diff --git a/drivers/gpu/drm/i915/i915_query.c b/drivers/gpu/drm/i915/i915_query.c
> > index e49da36c62fb..f10dcea94ac9 100644
> > --- a/drivers/gpu/drm/i915/i915_query.c
> > +++ b/drivers/gpu/drm/i915/i915_query.c
> > @@ -465,7 +465,7 @@ static int query_memregion_info(struct drm_i915_private *i915,
> > info.region.memory_class = mr->type;
> > info.region.memory_instance = mr->instance;
> > info.probed_size = mr->total;
> > - info.unallocated_size = mr->avail;
> > + info.unallocated_size = intel_memory_region_get_avail(mr);
> >
> > if (__copy_to_user(info_ptr, &info, sizeof(info)))
> > return -EFAULT;
> > diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
> > index fc7ad5c035b8..562d11edc5e4 100644
> > --- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
> > +++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
> > @@ -246,3 +246,16 @@ int i915_ttm_buddy_man_reserve(struct ttm_resource_manager *man,
> > return ret;
> > }
> >
> > +/**
> > + * i915_ttm_buddy_man_avail - Get the currently available size
> > + * @man: The buddy allocator ttm manager
> > + *
> > + * Return: The available size in bytes
> > + */
> > +u64 i915_ttm_buddy_man_get_avail(struct ttm_resource_manager *man)
> > +{
> > + struct i915_ttm_buddy_manager *bman = to_buddy_manager(man);
> > + struct i915_buddy_mm *mm = &bman->mm;
> > +
> > + return mm->avail;
> > +}
> > diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h
> > index 26026213e20a..39f5b1a4c3e7 100644
> > --- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h
> > +++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h
> > @@ -53,4 +53,6 @@ int i915_ttm_buddy_man_fini(struct ttm_device *bdev,
> > int i915_ttm_buddy_man_reserve(struct ttm_resource_manager *man,
> > u64 start, u64 size);
> >
> > +u64 i915_ttm_buddy_man_get_avail(struct ttm_resource_manager *man);
> > +
> > #endif
> > diff --git a/drivers/gpu/drm/i915/intel_memory_region.c b/drivers/gpu/drm/i915/intel_memory_region.c
> > index df59f884d37c..d5edf088be48 100644
> > --- a/drivers/gpu/drm/i915/intel_memory_region.c
> > +++ b/drivers/gpu/drm/i915/intel_memory_region.c
> > @@ -132,6 +132,21 @@ void intel_memory_region_set_name(struct intel_memory_region *mem,
> > va_end(ap);
> > }
> >
> > +/**
> > + * intel_memory_region_get_avail - Get the currently available size for the
> > + * region
> > + * @mr: The memory region
> > + *
> > + * Return: The available size in bytes
> > + */
> > +u64 intel_memory_region_get_avail(struct intel_memory_region *mr)
> > +{
> > + if (mr->type == INTEL_MEMORY_LOCAL)
> > + return i915_ttm_buddy_man_get_avail(mr->region_private);
> > +
> > + return mr->avail;
> > +}
> > +
> > static void __intel_memory_region_destroy(struct kref *kref)
> > {
> > struct intel_memory_region *mem =
> > diff --git a/drivers/gpu/drm/i915/intel_memory_region.h b/drivers/gpu/drm/i915/intel_memory_region.h
> > index 2be8433d373a..6f7a073d5a70 100644
> > --- a/drivers/gpu/drm/i915/intel_memory_region.h
> > +++ b/drivers/gpu/drm/i915/intel_memory_region.h
> > @@ -74,6 +74,7 @@ struct intel_memory_region {
> > resource_size_t io_start;
> > resource_size_t min_page_size;
> > resource_size_t total;
> > + /* Do not access directly. Use the accessor instead. */
> > resource_size_t avail;
> >
> > u16 type;
> > @@ -125,4 +126,7 @@ intel_memory_region_set_name(struct intel_memory_region *mem,
> > int intel_memory_region_reserve(struct intel_memory_region *mem,
> > resource_size_t offset,
> > resource_size_t size);
> > +
> > +u64 intel_memory_region_get_avail(struct intel_memory_region *mem);
> > +
> > #endif
> > --
> > 2.26.3
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
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