From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,HK_RANDOM_FROM,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CF3FBC4338F for ; Mon, 26 Jul 2021 16:08:27 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 98B3160F5E for ; Mon, 26 Jul 2021 16:08:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 98B3160F5E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 138CB6E90E; Mon, 26 Jul 2021 16:08:27 +0000 (UTC) Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTPS id 577946E860; Mon, 26 Jul 2021 16:08:25 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10057"; a="211988753" X-IronPort-AV: E=Sophos;i="5.84,270,1620716400"; d="scan'208";a="211988753" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jul 2021 09:08:10 -0700 X-IronPort-AV: E=Sophos;i="5.84,270,1620716400"; d="scan'208";a="436883249" Received: from jdonohue-mobl.ger.corp.intel.com (HELO [10.213.215.117]) ([10.213.215.117]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jul 2021 09:08:08 -0700 To: Jason Ekstrand References: <20210723192934.1004427-1-daniel.vetter@ffwll.ch> <20210723192934.1004427-4-daniel.vetter@ffwll.ch> <0edb5c4d-1faf-4b24-a21d-fd2e5be6591d@linux.intel.com> From: Tvrtko Ursulin Organization: Intel Corporation UK Plc Message-ID: <031997ab-5568-9dbd-fcee-b4f820a32632@linux.intel.com> Date: Mon, 26 Jul 2021 17:08:06 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US Subject: Re: [Intel-gfx] [PATCH 04/10] drm/i915: move intel_context slab to direct module init/exit X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Vetter , Intel Graphics Development , DRI Development , Daniel Vetter Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On 26/07/2021 16:42, Jason Ekstrand wrote: > On Mon, Jul 26, 2021 at 10:30 AM Jason Ekstrand wrote: >> >> On Mon, Jul 26, 2021 at 3:35 AM Tvrtko Ursulin >> 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 >>>> Signed-off-by: Daniel Vetter >>>> --- >>>> 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 >> >>>> >>>> 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 >>>> #include >>>> >>>> -#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. 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 Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx