From: Jason Ekstrand <jason@jlekstrand.net>
To: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>,
Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
DRI Development <dri-devel@lists.freedesktop.org>,
Daniel Vetter <daniel.vetter@intel.com>
Subject: Re: [Intel-gfx] [PATCH 04/10] drm/i915: move intel_context slab to direct module init/exit
Date: Mon, 26 Jul 2021 11:20:28 -0500 [thread overview]
Message-ID: <CAOFGe95G3bYWxZ_EwPEFzxf10vf1T3Zdyez_fbh=imcDj+TSHw@mail.gmail.com> (raw)
In-Reply-To: <031997ab-5568-9dbd-fcee-b4f820a32632@linux.intel.com>
On Mon, Jul 26, 2021 at 11:08 AM Tvrtko Ursulin
<tvrtko.ursulin@linux.intel.com> wrote:
> On 26/07/2021 16:42, Jason Ekstrand wrote:
> > On Mon, Jul 26, 2021 at 10:30 AM Jason Ekstrand <jason@jlekstrand.net> wrote:
> >>
> >> On Mon, Jul 26, 2021 at 3:35 AM Tvrtko Ursulin
> >> <tvrtko.ursulin@linux.intel.com> wrote:
> >>>
> >>>
> >>> On 23/07/2021 20:29, Daniel Vetter 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_ce to just a
> >>>> slab_ce.
> >>>>
> >>>> Cc: Jason Ekstrand <jason@jlekstrand.net>
> >>>> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> >>>> ---
> >>>> drivers/gpu/drm/i915/gt/intel_context.c | 25 ++++++++-----------------
> >>>> drivers/gpu/drm/i915/gt/intel_context.h | 3 +++
> >>>> drivers/gpu/drm/i915/i915_globals.c | 2 --
> >>>> drivers/gpu/drm/i915/i915_globals.h | 1 -
> >>>> drivers/gpu/drm/i915/i915_pci.c | 2 ++
> >>>> 5 files changed, 13 insertions(+), 20 deletions(-)
> >>>>
> >>>> diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c
> >>>> index baa05fddd690..283382549a6f 100644
> >>>> --- a/drivers/gpu/drm/i915/gt/intel_context.c
> >>>> +++ b/drivers/gpu/drm/i915/gt/intel_context.c
> >>>> @@ -7,7 +7,6 @@
> >>>> #include "gem/i915_gem_pm.h"
> >>>>
> >>>> #include "i915_drv.h"
> >>>> -#include "i915_globals.h"
> >>>> #include "i915_trace.h"
> >>>>
> >>>> #include "intel_context.h"
> >>>> @@ -15,14 +14,11 @@
> >>>> #include "intel_engine_pm.h"
> >>>> #include "intel_ring.h"
> >>>>
> >>>> -static struct i915_global_context {
> >>>> - struct i915_global base;
> >>>> - struct kmem_cache *slab_ce;
> >>>> -} global;
> >>>> +struct kmem_cache *slab_ce;
> >>
> >> Static? With that,
> >>
> >> Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
> >>
> >>>>
> >>>> static struct intel_context *intel_context_alloc(void)
> >>>> {
> >>>> - return kmem_cache_zalloc(global.slab_ce, GFP_KERNEL);
> >>>> + return kmem_cache_zalloc(slab_ce, GFP_KERNEL);
> >>>> }
> >>>>
> >>>> static void rcu_context_free(struct rcu_head *rcu)
> >>>> @@ -30,7 +26,7 @@ static void rcu_context_free(struct rcu_head *rcu)
> >>>> struct intel_context *ce = container_of(rcu, typeof(*ce), rcu);
> >>>>
> >>>> trace_intel_context_free(ce);
> >>>> - kmem_cache_free(global.slab_ce, ce);
> >>>> + kmem_cache_free(slab_ce, ce);
> >>>> }
> >>>>
> >>>> void intel_context_free(struct intel_context *ce)
> >>>> @@ -410,22 +406,17 @@ void intel_context_fini(struct intel_context *ce)
> >>>> i915_active_fini(&ce->active);
> >>>> }
> >>>>
> >>>> -static void i915_global_context_exit(void)
> >>>> +void i915_context_module_exit(void)
> >>>> {
> >>>> - kmem_cache_destroy(global.slab_ce);
> >>>> + kmem_cache_destroy(slab_ce);
> >>>> }
> >>>>
> >>>> -static struct i915_global_context global = { {
> >>>> - .exit = i915_global_context_exit,
> >>>> -} };
> >>>> -
> >>>> -int __init i915_global_context_init(void)
> >>>> +int __init i915_context_module_init(void)
> >>>> {
> >>>> - global.slab_ce = KMEM_CACHE(intel_context, SLAB_HWCACHE_ALIGN);
> >>>> - if (!global.slab_ce)
> >>>> + slab_ce = KMEM_CACHE(intel_context, SLAB_HWCACHE_ALIGN);
> >>>> + if (!slab_ce)
> >>>> return -ENOMEM;
> >>>>
> >>>> - i915_global_register(&global.base);
> >>>> return 0;
> >>>> }
> >>>>
> >>>> diff --git a/drivers/gpu/drm/i915/gt/intel_context.h b/drivers/gpu/drm/i915/gt/intel_context.h
> >>>> index 974ef85320c2..a0ca82e3c40d 100644
> >>>> --- a/drivers/gpu/drm/i915/gt/intel_context.h
> >>>> +++ b/drivers/gpu/drm/i915/gt/intel_context.h
> >>>> @@ -30,6 +30,9 @@ void intel_context_init(struct intel_context *ce,
> >>>> struct intel_engine_cs *engine);
> >>>> void intel_context_fini(struct intel_context *ce);
> >>>>
> >>>> +void i915_context_module_exit(void);
> >>>> +int i915_context_module_init(void);
> >>>> +
> >>>> struct intel_context *
> >>>> intel_context_create(struct intel_engine_cs *engine);
> >>>>
> >>>> diff --git a/drivers/gpu/drm/i915/i915_globals.c b/drivers/gpu/drm/i915/i915_globals.c
> >>>> index 3de7cf22ec76..d36eb7dc40aa 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 "gem/i915_gem_context.h"
> >>>> #include "gem/i915_gem_object.h"
> >>>> #include "i915_globals.h"
> >>>> #include "i915_request.h"
> >>>> @@ -32,7 +31,6 @@ static void __i915_globals_cleanup(void)
> >>>> }
> >>>>
> >>>> static __initconst int (* const initfn[])(void) = {
> >>>> - i915_global_context_init,
> >>>> i915_global_gem_context_init,
> >>>> i915_global_objects_init,
> >>>> i915_global_request_init,
> >>>> diff --git a/drivers/gpu/drm/i915/i915_globals.h b/drivers/gpu/drm/i915/i915_globals.h
> >>>> index d80901ba75e3..60daa738a188 100644
> >>>> --- a/drivers/gpu/drm/i915/i915_globals.h
> >>>> +++ b/drivers/gpu/drm/i915/i915_globals.h
> >>>> @@ -23,7 +23,6 @@ int i915_globals_init(void);
> >>>> void i915_globals_exit(void);
> >>>>
> >>>> /* constructors */
> >>>> -int i915_global_context_init(void);
> >>>> int i915_global_gem_context_init(void);
> >>>> int i915_global_objects_init(void);
> >>>> int i915_global_request_init(void);
> >>>> diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
> >>>> index f9527269e30a..266618157775 100644
> >>>> --- a/drivers/gpu/drm/i915/i915_pci.c
> >>>> +++ b/drivers/gpu/drm/i915/i915_pci.c
> >>>> @@ -33,6 +33,7 @@
> >>>> #include "i915_active.h"
> >>>> #include "i915_buddy.h"
> >>>> #include "i915_drv.h"
> >>>> +#include "gem/i915_gem_context.h"
> >>>
> >>> It's a bit ugly to go to a design where i915_pci.c has to include so
> >>> many random parts of i915. IMO for a complex driver like i915,
> >>> compartmentalizing so much knowledge about the internals was better
> >>> inside the globals layer.
> >>
> >> I agree that i915_pci feels like the wrong place to put this but I
> >> don't think that's so much because globals don't belong in i915_pci
> >> but because i915_init/exit don't belong there. Maybe, once this is
> >> all said and done (or at the start of the series), we should move
> >> i915_init/exit to i915_drv.c? Of course, there's a bunch of PCI
> >> probing stuff in i915_drv.c so..... yeah.... our organization is
> >> pretty busted.
> >
> > To put a finer point on this, the new "design" is really to have a
> > single flat list instead of two, one nested inside the other. There's
> > nothing wrong with that at all. The fact that all this stuff now
> > lives in i915_pci.c is ugly. But, as I said, that's kind-of an
> > accident of history because that's where i915_init() and i915_exit()
> > currently live. We should just move the lot to i915_drv.c.
>
> Hmm.. on one hand it does sounds better to move to i915_drv.c, but is it
> just because all these new include directive are so visibly out of place
> in i915_pci.c?
>
> Perhaps we need i915_module.c and then i915_globals is a completely fine
> concept. Desired IMO even since we have to avoid globals in general
> (multi-gpu) so it sticks out nicely that all that is allowed to be
> global has a special place.
>
> And i915_drv.c can remain being about a driver instance as bound to one GPU.
Is i915_drv.c about a single instance bound to a single GPU? If so,
then, yeah, maybe not the right place. Maybe a i915_module.c would be
better. It's all different shades of shed paint.
--Jason
> That feels like the best of both worlds to me.
>
> Regards,
>
> Tvrtko
>
> >
> >> --Jason
> >>
> >>> Maybe add a cover letter to explain the perceived pros and cons and
> >>> thinking in general?
> >>>
> >>> Regards,
> >>>
> >>> Tvrtko
> >>>
> >>>> #include "i915_perf.h"
> >>>> #include "i915_globals.h"
> >>>> #include "i915_selftest.h"
> >>>> @@ -1297,6 +1298,7 @@ static const struct {
> >>>> { i915_check_nomodeset, NULL },
> >>>> { i915_active_module_init, i915_active_module_exit },
> >>>> { i915_buddy_module_init, i915_buddy_module_exit },
> >>>> + { i915_context_module_init, i915_context_module_exit },
> >>>> { i915_globals_init, i915_globals_exit },
> >>>> { i915_mock_selftests, NULL },
> >>>> { i915_pmu_init, i915_pmu_exit },
> >>>>
> >>> _______________________________________________
> >>> Intel-gfx mailing list
> >>> Intel-gfx@lists.freedesktop.org
> >>> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
_______________________________________________
Intel-gfx mailing list
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next prev parent reply other threads:[~2021-07-26 16:20 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-23 19:29 [Intel-gfx] [PATCH 01/10] drm/i915: Check for nomodeset in i915_init() first Daniel Vetter
2021-07-23 19:29 ` [Intel-gfx] [PATCH 02/10] drm/i915: move i915_active slab to direct module init/exit Daniel Vetter
2021-07-26 15:24 ` Jason Ekstrand
2021-07-23 19:29 ` [Intel-gfx] [PATCH 03/10] drm/i915: move i915_buddy " Daniel Vetter
2021-07-24 7:38 ` kernel test robot
2021-07-24 7:38 ` [Intel-gfx] [RFC PATCH] drm/i915: slab_blocks can be static kernel test robot
2021-07-26 15:26 ` [Intel-gfx] [PATCH 03/10] drm/i915: move i915_buddy slab to direct module init/exit Jason Ekstrand
2021-07-23 19:29 ` [Intel-gfx] [PATCH 04/10] drm/i915: move intel_context " Daniel Vetter
2021-07-24 11:45 ` kernel test robot
2021-07-24 11:45 ` [Intel-gfx] [RFC PATCH] drm/i915: slab_ce can be static kernel test robot
2021-07-26 8:35 ` [Intel-gfx] [PATCH 04/10] drm/i915: move intel_context slab to direct module init/exit Tvrtko Ursulin
2021-07-26 15:30 ` Jason Ekstrand
2021-07-26 15:42 ` Jason Ekstrand
2021-07-26 16:08 ` Tvrtko Ursulin
2021-07-26 16:20 ` Jason Ekstrand [this message]
2021-07-26 16:31 ` Tvrtko Ursulin
2021-07-26 18:17 ` Jason Ekstrand
2021-07-27 10:14 ` Tvrtko Ursulin
2021-07-23 19:29 ` [Intel-gfx] [PATCH 05/10] drm/i915: move gem_context " Daniel Vetter
2021-07-24 14:50 ` kernel test robot
2021-07-24 14:50 ` [Intel-gfx] [RFC PATCH] drm/i915: slab_luts can be static kernel test robot
2021-07-26 15:35 ` [Intel-gfx] [PATCH 05/10] drm/i915: move gem_context slab to direct module init/exit Jason Ekstrand
2021-07-23 19:29 ` [Intel-gfx] [PATCH 06/10] drm/i915: move gem_objects " Daniel Vetter
2021-07-24 18:23 ` kernel test robot
2021-07-24 18:23 ` [Intel-gfx] [RFC PATCH] drm/i915: slab_objects can be static kernel test robot
2021-07-26 15:39 ` [Intel-gfx] [PATCH 06/10] drm/i915: move gem_objects slab to direct module init/exit Jason Ekstrand
2021-07-23 19:29 ` [Intel-gfx] [PATCH 07/10] drm/i915: move request slabs " Daniel Vetter
2021-07-24 21:58 ` kernel test robot
2021-07-24 21:58 ` [Intel-gfx] [RFC PATCH] drm/i915: slab_requests can be static kernel test robot
2021-07-26 15:46 ` [Intel-gfx] [PATCH 07/10] drm/i915: move request slabs to direct module init/exit Jason Ekstrand
2021-07-23 19:29 ` [Intel-gfx] [PATCH 08/10] drm/i915: move scheduler " Daniel Vetter
2021-07-25 1:23 ` kernel test robot
2021-07-25 1:23 ` [Intel-gfx] [RFC PATCH] drm/i915: slab_dependencies can be static kernel test robot
2021-07-26 15:47 ` [Intel-gfx] [PATCH 08/10] drm/i915: move scheduler slabs to direct module init/exit Jason Ekstrand
2021-07-23 19:29 ` [Intel-gfx] [PATCH 09/10] drm/i915: move vma slab " Daniel Vetter
2021-07-25 4:04 ` kernel test robot
2021-07-25 4:04 ` [Intel-gfx] [RFC PATCH] drm/i915: slab_vmas can be static kernel test robot
2021-07-26 15:50 ` [Intel-gfx] [PATCH 09/10] drm/i915: move vma slab to direct module init/exit Jason Ekstrand
2021-07-23 19:29 ` [Intel-gfx] [PATCH 10/10] drm/i915: Remove i915_globals Daniel Vetter
2021-07-26 15:51 ` Jason Ekstrand
2021-07-27 11:34 ` Daniel Vetter
2021-07-23 21:55 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with [01/10] drm/i915: Check for nomodeset in i915_init() first Patchwork
2021-07-23 21:56 ` [Intel-gfx] ✗ Fi.CI.SPARSE: " Patchwork
2021-07-23 22:29 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2021-07-24 9:00 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork
2021-07-26 15:23 ` [Intel-gfx] [PATCH 01/10] " Jason Ekstrand
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