Re: [PATCH 03/10] drm/i915: move i915_buddy slab to direct module init/exit

[Jason Ekstrand <jason@jlekstrand.net>]

On Fri, Jul 23, 2021 at 2:29 PM Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
>
> With the global kmem_cache shrink infrastructure gone there's nothing
> special and we can convert them over.
>
> I'm doing this split up into each patch because there's quite a bit of
> noise with removing the static global.slab_blocks to just a
> slab_blocks.
>
> Cc: Jason Ekstrand <jason@jlekstrand.net>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_buddy.c   | 25 ++++++++-----------------
>  drivers/gpu/drm/i915/i915_buddy.h   |  3 ++-
>  drivers/gpu/drm/i915/i915_globals.c |  2 --
>  drivers/gpu/drm/i915/i915_pci.c     |  2 ++
>  4 files changed, 12 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_buddy.c b/drivers/gpu/drm/i915/i915_buddy.c
> index caabcaea3be7..045d00c43b4c 100644
> --- a/drivers/gpu/drm/i915/i915_buddy.c
> +++ b/drivers/gpu/drm/i915/i915_buddy.c
> @@ -8,13 +8,9 @@
>  #include "i915_buddy.h"
>
>  #include "i915_gem.h"
> -#include "i915_globals.h"
>  #include "i915_utils.h"
>
> -static struct i915_global_buddy {
> -       struct i915_global base;
> -       struct kmem_cache *slab_blocks;
> -} global;
> +struct kmem_cache *slab_blocks;

static?  With that fixed,

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

>
>  static struct i915_buddy_block *i915_block_alloc(struct i915_buddy_mm *mm,
>                                                  struct i915_buddy_block *parent,
> @@ -25,7 +21,7 @@ static struct i915_buddy_block *i915_block_alloc(struct i915_buddy_mm *mm,
>
>         GEM_BUG_ON(order > I915_BUDDY_MAX_ORDER);
>
> -       block = kmem_cache_zalloc(global.slab_blocks, GFP_KERNEL);
> +       block = kmem_cache_zalloc(slab_blocks, GFP_KERNEL);
>         if (!block)
>                 return NULL;
>
> @@ -40,7 +36,7 @@ static struct i915_buddy_block *i915_block_alloc(struct i915_buddy_mm *mm,
>  static void i915_block_free(struct i915_buddy_mm *mm,
>                             struct i915_buddy_block *block)
>  {
> -       kmem_cache_free(global.slab_blocks, block);
> +       kmem_cache_free(slab_blocks, block);
>  }
>
>  static void mark_allocated(struct i915_buddy_block *block)
> @@ -410,21 +406,16 @@ int i915_buddy_alloc_range(struct i915_buddy_mm *mm,
>  #include "selftests/i915_buddy.c"
>  #endif
>
> -static void i915_global_buddy_exit(void)
> +void i915_buddy_module_exit(void)
>  {
> -       kmem_cache_destroy(global.slab_blocks);
> +       kmem_cache_destroy(slab_blocks);
>  }
>
> -static struct i915_global_buddy global = { {
> -       .exit = i915_global_buddy_exit,
> -} };
> -
> -int __init i915_global_buddy_init(void)
> +int __init i915_buddy_module_init(void)
>  {
> -       global.slab_blocks = KMEM_CACHE(i915_buddy_block, 0);
> -       if (!global.slab_blocks)
> +       slab_blocks = KMEM_CACHE(i915_buddy_block, 0);
> +       if (!slab_blocks)
>                 return -ENOMEM;
>
> -       i915_global_register(&global.base);
>         return 0;
>  }
> diff --git a/drivers/gpu/drm/i915/i915_buddy.h b/drivers/gpu/drm/i915/i915_buddy.h
> index d8f26706de52..3940d632f208 100644
> --- a/drivers/gpu/drm/i915/i915_buddy.h
> +++ b/drivers/gpu/drm/i915/i915_buddy.h
> @@ -129,6 +129,7 @@ void i915_buddy_free(struct i915_buddy_mm *mm, struct i915_buddy_block *block);
>
>  void i915_buddy_free_list(struct i915_buddy_mm *mm, struct list_head *objects);
>
> -int i915_global_buddy_init(void);
> +void i915_buddy_module_exit(void);
> +int i915_buddy_module_init(void);
>
>  #endif
> diff --git a/drivers/gpu/drm/i915/i915_globals.c b/drivers/gpu/drm/i915/i915_globals.c
> index a53135ee831d..3de7cf22ec76 100644
> --- a/drivers/gpu/drm/i915/i915_globals.c
> +++ b/drivers/gpu/drm/i915/i915_globals.c
> @@ -7,7 +7,6 @@
>  #include <linux/slab.h>
>  #include <linux/workqueue.h>
>
> -#include "i915_buddy.h"
>  #include "gem/i915_gem_context.h"
>  #include "gem/i915_gem_object.h"
>  #include "i915_globals.h"
> @@ -33,7 +32,6 @@ static void __i915_globals_cleanup(void)
>  }
>
>  static __initconst int (* const initfn[])(void) = {
> -       i915_global_buddy_init,
>         i915_global_context_init,
>         i915_global_gem_context_init,
>         i915_global_objects_init,
> diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
> index 6ee77a8f43d6..f9527269e30a 100644
> --- a/drivers/gpu/drm/i915/i915_pci.c
> +++ b/drivers/gpu/drm/i915/i915_pci.c
> @@ -31,6 +31,7 @@
>  #include "display/intel_fbdev.h"
>
>  #include "i915_active.h"
> +#include "i915_buddy.h"
>  #include "i915_drv.h"
>  #include "i915_perf.h"
>  #include "i915_globals.h"
> @@ -1295,6 +1296,7 @@ static const struct {
>  } init_funcs[] = {
>         { i915_check_nomodeset, NULL },
>         { i915_active_module_init, i915_active_module_exit },
> +       { i915_buddy_module_init, i915_buddy_module_exit },
>         { i915_globals_init, i915_globals_exit },
>         { i915_mock_selftests, NULL },
>         { i915_pmu_init, i915_pmu_exit },
> --
> 2.32.0
>