From patchwork Tue Feb 22 17:10:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Thomas Hellstrom X-Patchwork-Id: 12755712 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 9F3E4C433F5 for ; Tue, 22 Feb 2022 17:11:16 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D74E110E975; Tue, 22 Feb 2022 17:11:15 +0000 (UTC) Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTPS id DE81010E963 for ; Tue, 22 Feb 2022 17:11:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1645549873; x=1677085873; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=4IqvqolAxjeFFgFTKqXmXPzXbdUkY9IDyNwR8EyOqBI=; b=LP+aenJ8+2zG3S0EWZ0rxTi3VgnkqczLoAenREiMJy/FVReaMz1/oPIM mqrqaYPVNitN5ZLAV7qUf6654O+HPB+IM9dh+DQ+q+UHr+S+QTr++YbBx b1iF2JU05KfxsRiJwAVI1MmbL9xqEHo4VoUFWlSkuQMUoYDe8Whjfq4Gl /87GjFc/LLOtI20Eb68LsiJYAyLphZXrOMuvtAEcvQETfj42pOGZ4tacw tpkiJRQ4OPue89hMIDNOC/13g9DYqW2LEvmUMHjb6Z41OHFbUIRocOSR+ b3g2wh/lrghim/XI4dt5NJS4NajUGNtr4W3RaSNCBOe7LcfddljBm+BDQ w==; X-IronPort-AV: E=McAfee;i="6200,9189,10266"; a="251951329" X-IronPort-AV: E=Sophos;i="5.88,387,1635231600"; d="scan'208";a="251951329" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Feb 2022 09:11:13 -0800 X-IronPort-AV: E=Sophos;i="5.88,387,1635231600"; d="scan'208";a="532309072" Received: from tnguyen8-mobl.ccr.corp.intel.com (HELO thellstr-mobl1.intel.com) ([10.249.254.148]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Feb 2022 09:11:11 -0800 From: =?utf-8?q?Thomas_Hellstr=C3=B6m?= To: intel-gfx@lists.freedesktop.org Date: Tue, 22 Feb 2022 18:10:29 +0100 Message-Id: <20220222171030.690214-1-thomas.hellstrom@linux.intel.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 1/2] HAX: drm/i915: Clarify vma lifetime 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: =?utf-8?q?Thomas_Hellstr=C3=B6m?= , matthew.auld@intel.com Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" It's unclear what reference the initial vma kref reference refers to. A vma can have multiple weak references, the object vma list, the vm's bound list and the GT's closed_list, and the initial vma reference can be put from lookups of all these lists. With the current implementation this means that any holder of yet another vma refcount (currently only i915_gem_object_unbind()) needs to be holding two of either *) An object refcount, *) A vm open count *) A vma open count in order for us to not risk leaking a reference by having the initial vma reference being put twice. Address this by re-introducing i915_vma_destroy() which removes all weak references of the vma and *then* puts the initial vma refcount. This makes a strong vma reference hold on to the vma unconditionally. Perhaps a better name would be i915_vma_revoke() or i915_vma_zombify(), since other callers may still hold a refcount, but with the prospect of being able to replace the vma refcount with the object lock in the near future, let's stick with i915_vma_destroy(). Finally this commit fixes a race in that previously i915_vma_release() and now i915_vma_destroy() could destroy a vma without taking the vm->mutex after an advisory check that the vma mm_node was not allocated. This would race with the ungrab_vma() function creating a trace similar to the below one. This was fixed in one of the __i915_vma_put() callsites in commit bc1922e5d349 ("drm/i915: Fix a race between vma / object destruction and unbinding") but although not seemingly triggered by CI, that is not sufficient. This patch is needed to fix that properly. [823.012188] Console: switching to colour dummy device 80x25 [823.012422] [IGT] gem_ppgtt: executing [823.016667] [IGT] gem_ppgtt: starting subtest blt-vs-render-ctx0 [852.436465] stack segment: 0000 [#1] PREEMPT SMP NOPTI [852.436480] CPU: 0 PID: 3200 Comm: gem_ppgtt Not tainted 5.16.0-CI-CI_DRM_11115+ #1 [852.436489] Hardware name: Intel Corporation Alder Lake Client Platform/AlderLake-P DDR5 RVP, BIOS ADLPFWI1.R00.2422.A00.2110131104 10/13/2021 [852.436499] RIP: 0010:ungrab_vma+0x9/0x80 [i915] [852.436711] Code: ef e8 4b 85 cf e0 e8 36 a3 d6 e0 8b 83 f8 9c 00 00 85 c0 75 e1 5b 5d 41 5c 41 5d c3 e9 d6 fd 14 00 55 53 48 8b af c0 00 00 00 <8b> 45 00 85 c0 75 03 5b 5d c3 48 8b 85 a0 02 00 00 48 89 fb 48 8b [852.436727] RSP: 0018:ffffc90006db7880 EFLAGS: 00010246 [852.436734] RAX: 0000000000000000 RBX: ffffc90006db7598 RCX: 0000000000000000 [852.436742] RDX: ffff88815349e898 RSI: ffff88815349e858 RDI: ffff88810a284140 [852.436748] RBP: 6b6b6b6b6b6b6b6b R08: ffff88815349e898 R09: ffff88815349e8e8 [852.436754] R10: 0000000000000001 R11: 0000000051ef1141 R12: ffff88810a284140 [852.436762] R13: 0000000000000000 R14: ffff88815349e868 R15: ffff88810a284458 [852.436770] FS: 00007f5c04b04e40(0000) GS:ffff88849f000000(0000) knlGS:0000000000000000 [852.436781] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [852.436788] CR2: 00007f5c04b38fe0 CR3: 000000010a6e8001 CR4: 0000000000770ef0 [852.436797] PKRU: 55555554 [852.436801] Call Trace: [852.436806] [852.436811] i915_gem_evict_for_node+0x33c/0x3c0 [i915] [852.437014] i915_gem_gtt_reserve+0x106/0x130 [i915] [852.437211] i915_vma_pin_ww+0x8f4/0xb60 [i915] [852.437412] eb_validate_vmas+0x688/0x860 [i915] [852.437596] i915_gem_do_execbuffer+0xc0e/0x25b0 [i915] [852.437770] ? deactivate_slab+0x5f2/0x7d0 [852.437778] ? _raw_spin_unlock_irqrestore+0x50/0x60 [852.437789] ? i915_gem_execbuffer2_ioctl+0xc6/0x2c0 [i915] [852.437944] ? init_object+0x49/0x80 [852.437950] ? __lock_acquire+0x5e6/0x2580 [852.437963] i915_gem_execbuffer2_ioctl+0x116/0x2c0 [i915] [852.438129] ? i915_gem_do_execbuffer+0x25b0/0x25b0 [i915] [852.438300] drm_ioctl_kernel+0xac/0x140 [852.438310] drm_ioctl+0x201/0x3d0 [852.438316] ? i915_gem_do_execbuffer+0x25b0/0x25b0 [i915] [852.438490] __x64_sys_ioctl+0x6a/0xa0 [852.438498] do_syscall_64+0x37/0xb0 [852.438507] entry_SYSCALL_64_after_hwframe+0x44/0xae [852.438515] RIP: 0033:0x7f5c0415b317 [852.438523] Code: b3 66 90 48 8b 05 71 4b 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 41 4b 2d 00 f7 d8 64 89 01 48 [852.438542] RSP: 002b:00007ffd765039a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [852.438553] RAX: ffffffffffffffda RBX: 000055e4d7829dd0 RCX: 00007f5c0415b317 [852.438562] RDX: 00007ffd76503a00 RSI: 00000000c0406469 RDI: 0000000000000017 [852.438571] RBP: 00007ffd76503a00 R08: 0000000000000000 R09: 0000000000000081 [852.438579] R10: 00000000ffffff7f R11: 0000000000000246 R12: 00000000c0406469 [852.438587] R13: 0000000000000017 R14: 00007ffd76503a00 R15: 0000000000000000 [852.438598] [852.438602] Modules linked in: snd_hda_codec_hdmi i915 mei_hdcp x86_pkg_temp_thermal snd_hda_intel snd_intel_dspcfg drm_buddy coretemp crct10dif_pclmul crc32_pclmul snd_hda_codec ttm ghash_clmulni_intel snd_hwdep snd_hda_core e1000e drm_dp_helper ptp snd_pcm mei_me drm_kms_helper pps_core mei syscopyarea sysfillrect sysimgblt fb_sys_fops prime_numbers intel_lpss_pci smsc75xx usbnet mii [852.440310] ---[ end trace e52cdd2fe4fd911c ]--- v2: Fix typos in the commit message. Fixes: 7e00897be8bf ("drm/i915: Add object locking to i915_gem_evict_for_node and i915_gem_evict_something, v2.") Fixes: bc1922e5d349 ("drm/i915: Fix a race between vma / object destruction and unbinding") Cc: Maarten Lankhorst Signed-off-by: Thomas Hellström Reviewed-by: Matthew Auld --- drivers/gpu/drm/i915/gem/i915_gem_object.c | 14 +--- .../drm/i915/gem/selftests/i915_gem_mman.c | 4 +- drivers/gpu/drm/i915/gt/intel_gtt.c | 17 +++-- drivers/gpu/drm/i915/i915_vma.c | 74 ++++++++++++++++--- drivers/gpu/drm/i915/i915_vma.h | 3 + 5 files changed, 79 insertions(+), 33 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c index e03e362d320b..78c4cbe82031 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c @@ -267,12 +267,6 @@ void __i915_gem_object_pages_fini(struct drm_i915_gem_object *obj) if (!list_empty(&obj->vma.list)) { struct i915_vma *vma; - /* - * Note that the vma keeps an object reference while - * it is active, so it *should* not sleep while we - * destroy it. Our debug code errs insits it *might*. - * For the moment, play along. - */ spin_lock(&obj->vma.lock); while ((vma = list_first_entry_or_null(&obj->vma.list, struct i915_vma, @@ -280,13 +274,7 @@ void __i915_gem_object_pages_fini(struct drm_i915_gem_object *obj) GEM_BUG_ON(vma->obj != obj); spin_unlock(&obj->vma.lock); - /* Verify that the vma is unbound under the vm mutex. */ - mutex_lock(&vma->vm->mutex); - atomic_and(~I915_VMA_PIN_MASK, &vma->flags); - __i915_vma_unbind(vma); - mutex_unlock(&vma->vm->mutex); - - __i915_vma_put(vma); + i915_vma_destroy(vma); spin_lock(&obj->vma.lock); } diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c index ba29767348be..af36bffd064b 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c @@ -167,7 +167,7 @@ static int check_partial_mapping(struct drm_i915_gem_object *obj, out: i915_gem_object_lock(obj, NULL); - __i915_vma_put(vma); + i915_vma_destroy(vma); i915_gem_object_unlock(obj); return err; } @@ -264,7 +264,7 @@ static int check_partial_mappings(struct drm_i915_gem_object *obj, return err; i915_gem_object_lock(obj, NULL); - __i915_vma_put(vma); + i915_vma_destroy(vma); i915_gem_object_unlock(obj); if (igt_timeout(end_time, diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c index df23ebdfc994..4363848f7411 100644 --- a/drivers/gpu/drm/i915/gt/intel_gtt.c +++ b/drivers/gpu/drm/i915/gt/intel_gtt.c @@ -105,14 +105,19 @@ void __i915_vm_close(struct i915_address_space *vm) list_for_each_entry_safe(vma, vn, &vm->bound_list, vm_link) { struct drm_i915_gem_object *obj = vma->obj; - /* Keep the obj (and hence the vma) alive as _we_ destroy it */ - if (!kref_get_unless_zero(&obj->base.refcount)) + if (!kref_get_unless_zero(&obj->base.refcount)) { + /* + * Unbind the dying vma to ensure the bound_list + * is completely drained. We leave the destruction to + * the object destructor. + */ + atomic_and(~I915_VMA_PIN_MASK, &vma->flags); + WARN_ON(__i915_vma_unbind(vma)); continue; + } - atomic_and(~I915_VMA_PIN_MASK, &vma->flags); - WARN_ON(__i915_vma_unbind(vma)); - __i915_vma_put(vma); - + /* Keep the obj (and hence the vma) alive as _we_ destroy it */ + i915_vma_destroy_locked(vma); i915_gem_object_put(obj); } GEM_BUG_ON(!list_empty(&vm->bound_list)); diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c index 52f43a465440..9c1582a473c6 100644 --- a/drivers/gpu/drm/i915/i915_vma.c +++ b/drivers/gpu/drm/i915/i915_vma.c @@ -1562,15 +1562,27 @@ void i915_vma_reopen(struct i915_vma *vma) void i915_vma_release(struct kref *ref) { struct i915_vma *vma = container_of(ref, typeof(*vma), ref); + + i915_vm_put(vma->vm); + i915_active_fini(&vma->active); + GEM_WARN_ON(vma->resource); + i915_vma_free(vma); +} + +static void force_unbind(struct i915_vma *vma) +{ + if (!drm_mm_node_allocated(&vma->node)) + return; + + atomic_and(~I915_VMA_PIN_MASK, &vma->flags); + WARN_ON(__i915_vma_unbind(vma)); + GEM_BUG_ON(drm_mm_node_allocated(&vma->node)); +} + +static void release_references(struct i915_vma *vma) +{ struct drm_i915_gem_object *obj = vma->obj; - if (drm_mm_node_allocated(&vma->node)) { - mutex_lock(&vma->vm->mutex); - atomic_and(~I915_VMA_PIN_MASK, &vma->flags); - WARN_ON(__i915_vma_unbind(vma)); - mutex_unlock(&vma->vm->mutex); - GEM_BUG_ON(drm_mm_node_allocated(&vma->node)); - } GEM_BUG_ON(i915_vma_is_active(vma)); spin_lock(&obj->vma.lock); @@ -1580,11 +1592,49 @@ void i915_vma_release(struct kref *ref) spin_unlock(&obj->vma.lock); __i915_vma_remove_closed(vma); - i915_vm_put(vma->vm); - i915_active_fini(&vma->active); - GEM_WARN_ON(vma->resource); - i915_vma_free(vma); + __i915_vma_put(vma); +} + +/** + * i915_vma_destroy_locked - Remove all weak reference to the vma and put + * the initial reference. + * + * This function should be called when it's decided the vma isn't needed + * anymore. The caller must assure that it doesn't race with another lookup + * plus destroy, typically by taking an appropriate reference. + * + * Current callsites are + * - __i915_gem_object_pages_fini() + * - __i915_vm_close() - Blocks the above function by taking a reference on + * the object. + * - __i915_vma_parked() - Blocks the above functions by taking an open-count on + * the vm and a reference on the object. + * + * Because of locks taken during destruction, a vma is also guaranteed to + * stay alive while the following locks are held if it was looked up while + * holding one of the locks: + * - vm->mutex + * - obj->vma.lock + * - gt->closed_lock + * + * A vma user can also temporarily keep the vma alive while holding a vma + * reference. + */ +void i915_vma_destroy_locked(struct i915_vma *vma) +{ + lockdep_assert_held(&vma->vm->mutex); + + force_unbind(vma); + release_references(vma); +} + +void i915_vma_destroy(struct i915_vma *vma) +{ + mutex_lock(&vma->vm->mutex); + force_unbind(vma); + mutex_unlock(&vma->vm->mutex); + release_references(vma); } void i915_vma_parked(struct intel_gt *gt) @@ -1618,7 +1668,7 @@ void i915_vma_parked(struct intel_gt *gt) if (i915_gem_object_trylock(obj, NULL)) { INIT_LIST_HEAD(&vma->closed_link); - __i915_vma_put(vma); + i915_vma_destroy(vma); i915_gem_object_unlock(obj); } else { /* back you go.. */ diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h index 011af044ad4f..67ae7341c7e0 100644 --- a/drivers/gpu/drm/i915/i915_vma.h +++ b/drivers/gpu/drm/i915/i915_vma.h @@ -236,6 +236,9 @@ static inline void __i915_vma_put(struct i915_vma *vma) kref_put(&vma->ref, i915_vma_release); } +void i915_vma_destroy_locked(struct i915_vma *vma); +void i915_vma_destroy(struct i915_vma *vma); + #define assert_vma_held(vma) dma_resv_assert_held((vma)->obj->base.resv) static inline void i915_vma_lock(struct i915_vma *vma) From patchwork Tue Feb 22 17:10:30 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Thomas Hellstrom X-Patchwork-Id: 12755713 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 66812C433EF for ; Tue, 22 Feb 2022 17:11:35 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5CCCF10EA34; Tue, 22 Feb 2022 17:11:32 +0000 (UTC) Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id BCC4110EA34; Tue, 22 Feb 2022 17:11:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1645549889; x=1677085889; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Su+q1OhXCCdWgUy2SAP/ACauPa4imYy4DR0nHypQvHI=; b=aaw8qWF9gZl4hNiHy/HgW58A3asDFIuj6JYTvHaSrulfbo2qxSL0zpri FdatKpyXGtImvUuOdVFeeteg9Lf+iWEeVzLLb/t9ITt7QLHwJFGV4vUva r1TR2kEVXlw2Q5N4HxjXU5bZt/friKWz6Akn1Gj8D54isDBK7FijHvsTX mbit1tg4YSNfknO3Syd4FT42pVQGGwVxbWzSzZ+fGtBcgfG/enKKebNoc M2qztFbPeIHYDQjYmZcJiyaH63OFlBVp7eAhxMYzXtiQHWhxonpj7POLU hVYaw7towsPGcpp/nkHnUfc20fEWGCK3wLLTPiCPMe8TjmywyGlsXsgA9 A==; X-IronPort-AV: E=McAfee;i="6200,9189,10266"; a="312475577" X-IronPort-AV: E=Sophos;i="5.88,387,1635231600"; d="scan'208";a="312475577" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Feb 2022 09:11:29 -0800 X-IronPort-AV: E=Sophos;i="5.88,387,1635231600"; d="scan'208";a="532309100" Received: from tnguyen8-mobl.ccr.corp.intel.com (HELO thellstr-mobl1.intel.com) ([10.249.254.148]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Feb 2022 09:11:26 -0800 From: =?utf-8?q?Thomas_Hellstr=C3=B6m?= To: intel-gfx@lists.freedesktop.org Date: Tue, 22 Feb 2022 18:10:30 +0100 Message-Id: <20220222171030.690214-2-thomas.hellstrom@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220222171030.690214-1-thomas.hellstrom@linux.intel.com> References: <20220222171030.690214-1-thomas.hellstrom@linux.intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 2/2] drm/i915: Remove the vm open count 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: =?utf-8?q?Thomas_Hellstr=C3=B6m?= , matthew.auld@intel.com, dri-devel@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" vms are not getting properly closed. Rather than fixing that, Remove the vm open count and instead rely on the vm refcount. The vm open count existed solely to break the strong references the vmas had on the vms. Now instead make those references weak and ensure vmas are destroyed when the vm is destroyed. Unfortunately if the vm destructor and the object destructor both wants to destroy a vma, that may lead to a race in that the vm destructor just unbinds the vma and leaves the actual vma destruction to the object destructor. However in order for the object destructor to ensure the vma is unbound it needs to grab the vm mutex. In order to keep the vm mutex alive until the object destructor is done with it, somewhat hackishly grab a vm_resv refcount that is released late in the vma destruction process, when the vm mutex is no longer needed. Cc: Co-developed-by: Niranjana Vishwanathapura Signed-off-by: Niranjana Vishwanathapura Signed-off-by: Thomas Hellström --- drivers/gpu/drm/i915/display/intel_dpt.c | 2 +- drivers/gpu/drm/i915/gem/i915_gem_context.c | 29 ++----- .../gpu/drm/i915/gem/i915_gem_execbuffer.c | 6 ++ .../gpu/drm/i915/gem/selftests/mock_context.c | 5 +- drivers/gpu/drm/i915/gt/gen6_ppgtt.c | 2 +- drivers/gpu/drm/i915/gt/intel_ggtt.c | 25 ++---- drivers/gpu/drm/i915/gt/intel_gtt.c | 48 ++++++++--- drivers/gpu/drm/i915/gt/intel_gtt.h | 56 ++++-------- drivers/gpu/drm/i915/gt/selftest_execlists.c | 86 +++++++++---------- drivers/gpu/drm/i915/i915_gem.c | 6 +- drivers/gpu/drm/i915/i915_vma.c | 55 ++++++++---- drivers/gpu/drm/i915/i915_vma_resource.c | 2 +- drivers/gpu/drm/i915/i915_vma_resource.h | 6 ++ drivers/gpu/drm/i915/i915_vma_types.h | 7 ++ drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 4 +- 15 files changed, 179 insertions(+), 160 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_dpt.c b/drivers/gpu/drm/i915/display/intel_dpt.c index c2f8f853db90..6920669bc571 100644 --- a/drivers/gpu/drm/i915/display/intel_dpt.c +++ b/drivers/gpu/drm/i915/display/intel_dpt.c @@ -298,5 +298,5 @@ void intel_dpt_destroy(struct i915_address_space *vm) { struct i915_dpt *dpt = i915_vm_to_dpt(vm); - i915_vm_close(&dpt->vm); + i915_vm_put(&dpt->vm); } diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c index ebbac2ea0833..41404f043741 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c @@ -1440,8 +1440,6 @@ static void set_closed_name(struct i915_gem_context *ctx) static void context_close(struct i915_gem_context *ctx) { - struct i915_address_space *vm; - /* Flush any concurrent set_engines() */ mutex_lock(&ctx->engines_mutex); unpin_engines(__context_engines_static(ctx)); @@ -1453,19 +1451,6 @@ static void context_close(struct i915_gem_context *ctx) set_closed_name(ctx); - vm = ctx->vm; - if (vm) { - /* i915_vm_close drops the final reference, which is a bit too - * early and could result in surprises with concurrent - * operations racing with thist ctx close. Keep a full reference - * until the end. - */ - i915_vm_get(vm); - i915_vm_close(vm); - } - - ctx->file_priv = ERR_PTR(-EBADF); - /* * The LUT uses the VMA as a backpointer to unref the object, * so we need to clear the LUT before we close all the VMA (inside @@ -1473,6 +1458,8 @@ static void context_close(struct i915_gem_context *ctx) */ lut_close(ctx); + ctx->file_priv = ERR_PTR(-EBADF); + spin_lock(&ctx->i915->gem.contexts.lock); list_del(&ctx->link); spin_unlock(&ctx->i915->gem.contexts.lock); @@ -1571,12 +1558,8 @@ i915_gem_create_context(struct drm_i915_private *i915, } vm = &ppgtt->vm; } - if (vm) { - ctx->vm = i915_vm_open(vm); - - /* i915_vm_open() takes a reference */ - i915_vm_put(vm); - } + if (vm) + ctx->vm = vm; mutex_init(&ctx->engines_mutex); if (pc->num_user_engines >= 0) { @@ -1626,7 +1609,7 @@ i915_gem_create_context(struct drm_i915_private *i915, free_engines(e); err_vm: if (ctx->vm) - i915_vm_close(ctx->vm); + i915_vm_put(ctx->vm); err_ctx: kfree(ctx); return ERR_PTR(err); @@ -1810,7 +1793,7 @@ static int get_ppgtt(struct drm_i915_file_private *file_priv, if (err) return err; - i915_vm_open(vm); + i915_vm_get(vm); GEM_BUG_ON(id == 0); /* reserved for invalid/unassigned ppgtt */ args->value = id; diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c index ae6805b37806..4a0af90546cf 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c @@ -2688,6 +2688,11 @@ eb_select_engine(struct i915_execbuffer *eb) if (err) goto err; + if (!i915_vm_tryget(ce->vm)) { + err = -ENOENT; + goto err; + } + eb->context = ce; eb->gt = ce->engine->gt; @@ -2711,6 +2716,7 @@ eb_put_engine(struct i915_execbuffer *eb) { struct intel_context *child; + i915_vm_put(eb->context->vm); intel_gt_pm_put(eb->gt); for_each_child(eb->context, child) intel_context_put(child); diff --git a/drivers/gpu/drm/i915/gem/selftests/mock_context.c b/drivers/gpu/drm/i915/gem/selftests/mock_context.c index c0a8ef368044..5675b04dfa33 100644 --- a/drivers/gpu/drm/i915/gem/selftests/mock_context.c +++ b/drivers/gpu/drm/i915/gem/selftests/mock_context.c @@ -41,8 +41,7 @@ mock_context(struct drm_i915_private *i915, if (!ppgtt) goto err_free; - ctx->vm = i915_vm_open(&ppgtt->vm); - i915_vm_put(&ppgtt->vm); + ctx->vm = &ppgtt->vm; } mutex_init(&ctx->engines_mutex); @@ -58,7 +57,7 @@ mock_context(struct drm_i915_private *i915, err_vm: if (ctx->vm) - i915_vm_close(ctx->vm); + i915_vm_put(ctx->vm); err_free: kfree(ctx); return NULL; diff --git a/drivers/gpu/drm/i915/gt/gen6_ppgtt.c b/drivers/gpu/drm/i915/gt/gen6_ppgtt.c index d657ffd6c86a..b40c965cfae0 100644 --- a/drivers/gpu/drm/i915/gt/gen6_ppgtt.c +++ b/drivers/gpu/drm/i915/gt/gen6_ppgtt.c @@ -318,7 +318,7 @@ int gen6_ppgtt_pin(struct i915_ppgtt *base, struct i915_gem_ww_ctx *ww) struct gen6_ppgtt *ppgtt = to_gen6_ppgtt(base); int err; - GEM_BUG_ON(!atomic_read(&ppgtt->base.vm.open)); + GEM_BUG_ON(!kref_read(&ppgtt->base.vm.ref)); /* * Workaround the limited maximum vma->pin_count and the aliasing_ppgtt diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c b/drivers/gpu/drm/i915/gt/intel_ggtt.c index 536b0995b595..cb694fe8586e 100644 --- a/drivers/gpu/drm/i915/gt/intel_ggtt.c +++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c @@ -125,7 +125,7 @@ static bool needs_idle_maps(struct drm_i915_private *i915) void i915_ggtt_suspend_vm(struct i915_address_space *vm) { struct i915_vma *vma, *vn; - int open; + int save_skip_rewrite; drm_WARN_ON(&vm->i915->drm, !vm->is_ggtt && !vm->is_dpt); @@ -135,7 +135,8 @@ void i915_ggtt_suspend_vm(struct i915_address_space *vm) mutex_lock(&vm->mutex); /* Skip rewriting PTE on VMA unbind. */ - open = atomic_xchg(&vm->open, 0); + save_skip_rewrite = vm->skip_pte_rewrite; + vm->skip_pte_rewrite = true; list_for_each_entry_safe(vma, vn, &vm->bound_list, vm_link) { struct drm_i915_gem_object *obj = vma->obj; @@ -153,16 +154,14 @@ void i915_ggtt_suspend_vm(struct i915_address_space *vm) */ i915_gem_object_get(obj); - atomic_set(&vm->open, open); mutex_unlock(&vm->mutex); i915_gem_object_lock(obj, NULL); - open = i915_vma_unbind(vma); + GEM_WARN_ON(i915_vma_unbind(vma)); i915_gem_object_unlock(obj); - - GEM_WARN_ON(open); - i915_gem_object_put(obj); + + vm->skip_pte_rewrite = save_skip_rewrite; goto retry; } @@ -178,7 +177,7 @@ void i915_ggtt_suspend_vm(struct i915_address_space *vm) vm->clear_range(vm, 0, vm->total); - atomic_set(&vm->open, open); + vm->skip_pte_rewrite = save_skip_rewrite; mutex_unlock(&vm->mutex); } @@ -772,13 +771,13 @@ static void ggtt_cleanup_hw(struct i915_ggtt *ggtt) { struct i915_vma *vma, *vn; - atomic_set(&ggtt->vm.open, 0); - flush_workqueue(ggtt->vm.i915->wq); i915_gem_drain_freed_objects(ggtt->vm.i915); mutex_lock(&ggtt->vm.mutex); + ggtt->vm.skip_pte_rewrite = true; + list_for_each_entry_safe(vma, vn, &ggtt->vm.bound_list, vm_link) { struct drm_i915_gem_object *obj = vma->obj; bool trylock; @@ -1306,16 +1305,12 @@ bool i915_ggtt_resume_vm(struct i915_address_space *vm) { struct i915_vma *vma; bool write_domain_objs = false; - int open; drm_WARN_ON(&vm->i915->drm, !vm->is_ggtt && !vm->is_dpt); /* First fill our portion of the GTT with scratch pages */ vm->clear_range(vm, 0, vm->total); - /* Skip rewriting PTE on VMA unbind. */ - open = atomic_xchg(&vm->open, 0); - /* clflush objects bound into the GGTT and rebind them. */ list_for_each_entry(vma, &vm->bound_list, vm_link) { struct drm_i915_gem_object *obj = vma->obj; @@ -1332,8 +1327,6 @@ bool i915_ggtt_resume_vm(struct i915_address_space *vm) } } - atomic_set(&vm->open, open); - return write_domain_objs; } diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c index 4363848f7411..ff402653938a 100644 --- a/drivers/gpu/drm/i915/gt/intel_gtt.c +++ b/drivers/gpu/drm/i915/gt/intel_gtt.c @@ -95,32 +95,52 @@ int map_pt_dma_locked(struct i915_address_space *vm, struct drm_i915_gem_object return 0; } -void __i915_vm_close(struct i915_address_space *vm) +static void clear_vm_list(struct list_head *list) { struct i915_vma *vma, *vn; - if (!atomic_dec_and_mutex_lock(&vm->open, &vm->mutex)) - return; - - list_for_each_entry_safe(vma, vn, &vm->bound_list, vm_link) { + list_for_each_entry_safe(vma, vn, list, vm_link) { struct drm_i915_gem_object *obj = vma->obj; if (!kref_get_unless_zero(&obj->base.refcount)) { /* * Unbind the dying vma to ensure the bound_list * is completely drained. We leave the destruction to - * the object destructor. + * the object destructor to avoid the vma + * disappearing under it. */ atomic_and(~I915_VMA_PIN_MASK, &vma->flags); WARN_ON(__i915_vma_unbind(vma)); + + /* Remove from the unbound list */ + list_del_init(&vma->vm_link); + + /* + * Delay the vm and vm mutex freeing until the + * object is done with destruction. + */ + i915_vm_resv_get(vma->vm); + vma->vm_ddestroy = true; + continue; + } else { + i915_vma_destroy_locked(vma); + i915_gem_object_put(obj); } - /* Keep the obj (and hence the vma) alive as _we_ destroy it */ - i915_vma_destroy_locked(vma); - i915_gem_object_put(obj); } +} + +static void __i915_vm_close(struct i915_address_space *vm) +{ + mutex_lock(&vm->mutex); + + clear_vm_list(&vm->bound_list); + clear_vm_list(&vm->unbound_list); + + /* Check for must-fix unanticipated side-effects */ GEM_BUG_ON(!list_empty(&vm->bound_list)); + GEM_BUG_ON(!list_empty(&vm->unbound_list)); mutex_unlock(&vm->mutex); } @@ -142,7 +162,6 @@ int i915_vm_lock_objects(struct i915_address_space *vm, void i915_address_space_fini(struct i915_address_space *vm) { drm_mm_takedown(&vm->mm); - mutex_destroy(&vm->mutex); } /** @@ -150,7 +169,8 @@ void i915_address_space_fini(struct i915_address_space *vm) * @kref: Pointer to the &i915_address_space.resv_ref member. * * This function is called when the last lock sharer no longer shares the - * &i915_address_space._resv lock. + * &i915_address_space._resv lock, and also if we raced when + * destroying a vma by the vma destruction */ void i915_vm_resv_release(struct kref *kref) { @@ -158,6 +178,8 @@ void i915_vm_resv_release(struct kref *kref) container_of(kref, typeof(*vm), resv_ref); dma_resv_fini(&vm->_resv); + mutex_destroy(&vm->mutex); + kfree(vm); } @@ -166,6 +188,8 @@ static void __i915_vm_release(struct work_struct *work) struct i915_address_space *vm = container_of(work, struct i915_address_space, release_work); + __i915_vm_close(vm); + /* Synchronize async unbinds. */ i915_vma_resource_bind_dep_sync_all(vm); @@ -199,7 +223,6 @@ void i915_address_space_init(struct i915_address_space *vm, int subclass) vm->pending_unbind = RB_ROOT_CACHED; INIT_WORK(&vm->release_work, __i915_vm_release); - atomic_set(&vm->open, 1); /* * The vm->mutex must be reclaim safe (for use in the shrinker). @@ -243,6 +266,7 @@ void i915_address_space_init(struct i915_address_space *vm, int subclass) vm->mm.head_node.color = I915_COLOR_UNEVICTABLE; INIT_LIST_HEAD(&vm->bound_list); + INIT_LIST_HEAD(&vm->unbound_list); } void *__px_vaddr(struct drm_i915_gem_object *p) diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h index 9d83c2d3959c..4529b5e9f6e6 100644 --- a/drivers/gpu/drm/i915/gt/intel_gtt.h +++ b/drivers/gpu/drm/i915/gt/intel_gtt.h @@ -240,15 +240,6 @@ struct i915_address_space { unsigned int bind_async_flags; - /* - * Each active user context has its own address space (in full-ppgtt). - * Since the vm may be shared between multiple contexts, we count how - * many contexts keep us "open". Once open hits zero, we are closed - * and do not allow any new attachments, and proceed to shutdown our - * vma and page directories. - */ - atomic_t open; - struct mutex mutex; /* protects vma and our lists */ struct kref resv_ref; /* kref to keep the reservation lock alive. */ @@ -263,6 +254,11 @@ struct i915_address_space { */ struct list_head bound_list; + /** + * List of vmas not yet bound or evicted. + */ + struct list_head unbound_list; + /* Global GTT */ bool is_ggtt:1; @@ -272,6 +268,9 @@ struct i915_address_space { /* Some systems support read-only mappings for GGTT and/or PPGTT */ bool has_read_only:1; + /* Skip pte rewrite on unbind for suspend. Protected by @mutex */ + bool skip_pte_rewrite:1; + u8 top; u8 pd_shift; u8 scratch_order; @@ -446,6 +445,17 @@ i915_vm_get(struct i915_address_space *vm) return vm; } +static inline struct i915_address_space * +i915_vm_tryget(struct i915_address_space *vm) +{ + return kref_get_unless_zero(&vm->ref) ? vm : NULL; +} + +static inline void assert_vm_alive(struct i915_address_space *vm) +{ + GEM_BUG_ON(!kref_read(&vm->ref)); +} + /** * i915_vm_resv_get - Obtain a reference on the vm's reservation lock * @vm: The vm whose reservation lock we want to share. @@ -476,34 +486,6 @@ static inline void i915_vm_resv_put(struct i915_address_space *vm) kref_put(&vm->resv_ref, i915_vm_resv_release); } -static inline struct i915_address_space * -i915_vm_open(struct i915_address_space *vm) -{ - GEM_BUG_ON(!atomic_read(&vm->open)); - atomic_inc(&vm->open); - return i915_vm_get(vm); -} - -static inline bool -i915_vm_tryopen(struct i915_address_space *vm) -{ - if (atomic_add_unless(&vm->open, 1, 0)) - return i915_vm_get(vm); - - return false; -} - -void __i915_vm_close(struct i915_address_space *vm); - -static inline void -i915_vm_close(struct i915_address_space *vm) -{ - GEM_BUG_ON(!atomic_read(&vm->open)); - __i915_vm_close(vm); - - i915_vm_put(vm); -} - void i915_address_space_init(struct i915_address_space *vm, int subclass); void i915_address_space_fini(struct i915_address_space *vm); diff --git a/drivers/gpu/drm/i915/gt/selftest_execlists.c b/drivers/gpu/drm/i915/gt/selftest_execlists.c index e10da897e07a..401f71973238 100644 --- a/drivers/gpu/drm/i915/gt/selftest_execlists.c +++ b/drivers/gpu/drm/i915/gt/selftest_execlists.c @@ -1735,15 +1735,9 @@ static int live_preempt(void *arg) enum intel_engine_id id; int err = -ENOMEM; - if (igt_spinner_init(&spin_hi, gt)) - return -ENOMEM; - - if (igt_spinner_init(&spin_lo, gt)) - goto err_spin_hi; - ctx_hi = kernel_context(gt->i915, NULL); if (!ctx_hi) - goto err_spin_lo; + return -ENOMEM; ctx_hi->sched.priority = I915_CONTEXT_MAX_USER_PRIORITY; ctx_lo = kernel_context(gt->i915, NULL); @@ -1751,6 +1745,12 @@ static int live_preempt(void *arg) goto err_ctx_hi; ctx_lo->sched.priority = I915_CONTEXT_MIN_USER_PRIORITY; + if (igt_spinner_init(&spin_hi, gt)) + goto err_ctx_lo; + + if (igt_spinner_init(&spin_lo, gt)) + goto err_spin_hi; + for_each_engine(engine, gt, id) { struct igt_live_test t; struct i915_request *rq; @@ -1760,14 +1760,14 @@ static int live_preempt(void *arg) if (igt_live_test_begin(&t, gt->i915, __func__, engine->name)) { err = -EIO; - goto err_ctx_lo; + goto err_spin_lo; } rq = spinner_create_request(&spin_lo, ctx_lo, engine, MI_ARB_CHECK); if (IS_ERR(rq)) { err = PTR_ERR(rq); - goto err_ctx_lo; + goto err_spin_lo; } i915_request_add(rq); @@ -1776,7 +1776,7 @@ static int live_preempt(void *arg) GEM_TRACE_DUMP(); intel_gt_set_wedged(gt); err = -EIO; - goto err_ctx_lo; + goto err_spin_lo; } rq = spinner_create_request(&spin_hi, ctx_hi, engine, @@ -1784,7 +1784,7 @@ static int live_preempt(void *arg) if (IS_ERR(rq)) { igt_spinner_end(&spin_lo); err = PTR_ERR(rq); - goto err_ctx_lo; + goto err_spin_lo; } i915_request_add(rq); @@ -1793,7 +1793,7 @@ static int live_preempt(void *arg) GEM_TRACE_DUMP(); intel_gt_set_wedged(gt); err = -EIO; - goto err_ctx_lo; + goto err_spin_lo; } igt_spinner_end(&spin_hi); @@ -1801,19 +1801,19 @@ static int live_preempt(void *arg) if (igt_live_test_end(&t)) { err = -EIO; - goto err_ctx_lo; + goto err_spin_lo; } } err = 0; -err_ctx_lo: - kernel_context_close(ctx_lo); -err_ctx_hi: - kernel_context_close(ctx_hi); err_spin_lo: igt_spinner_fini(&spin_lo); err_spin_hi: igt_spinner_fini(&spin_hi); +err_ctx_lo: + kernel_context_close(ctx_lo); +err_ctx_hi: + kernel_context_close(ctx_hi); return err; } @@ -1827,20 +1827,20 @@ static int live_late_preempt(void *arg) enum intel_engine_id id; int err = -ENOMEM; - if (igt_spinner_init(&spin_hi, gt)) - return -ENOMEM; - - if (igt_spinner_init(&spin_lo, gt)) - goto err_spin_hi; - ctx_hi = kernel_context(gt->i915, NULL); if (!ctx_hi) - goto err_spin_lo; + return -ENOMEM; ctx_lo = kernel_context(gt->i915, NULL); if (!ctx_lo) goto err_ctx_hi; + if (igt_spinner_init(&spin_hi, gt)) + goto err_ctx_lo; + + if (igt_spinner_init(&spin_lo, gt)) + goto err_spin_hi; + /* Make sure ctx_lo stays before ctx_hi until we trigger preemption. */ ctx_lo->sched.priority = 1; @@ -1853,14 +1853,14 @@ static int live_late_preempt(void *arg) if (igt_live_test_begin(&t, gt->i915, __func__, engine->name)) { err = -EIO; - goto err_ctx_lo; + goto err_spin_lo; } rq = spinner_create_request(&spin_lo, ctx_lo, engine, MI_ARB_CHECK); if (IS_ERR(rq)) { err = PTR_ERR(rq); - goto err_ctx_lo; + goto err_spin_lo; } i915_request_add(rq); @@ -1874,7 +1874,7 @@ static int live_late_preempt(void *arg) if (IS_ERR(rq)) { igt_spinner_end(&spin_lo); err = PTR_ERR(rq); - goto err_ctx_lo; + goto err_spin_lo; } i915_request_add(rq); @@ -1897,19 +1897,19 @@ static int live_late_preempt(void *arg) if (igt_live_test_end(&t)) { err = -EIO; - goto err_ctx_lo; + goto err_spin_lo; } } err = 0; -err_ctx_lo: - kernel_context_close(ctx_lo); -err_ctx_hi: - kernel_context_close(ctx_hi); err_spin_lo: igt_spinner_fini(&spin_lo); err_spin_hi: igt_spinner_fini(&spin_hi); +err_ctx_lo: + kernel_context_close(ctx_lo); +err_ctx_hi: + kernel_context_close(ctx_hi); return err; err_wedged: @@ -1917,7 +1917,7 @@ static int live_late_preempt(void *arg) igt_spinner_end(&spin_lo); intel_gt_set_wedged(gt); err = -EIO; - goto err_ctx_lo; + goto err_spin_lo; } struct preempt_client { @@ -3381,12 +3381,9 @@ static int live_preempt_timeout(void *arg) if (!intel_has_reset_engine(gt)) return 0; - if (igt_spinner_init(&spin_lo, gt)) - return -ENOMEM; - ctx_hi = kernel_context(gt->i915, NULL); if (!ctx_hi) - goto err_spin_lo; + return -ENOMEM; ctx_hi->sched.priority = I915_CONTEXT_MAX_USER_PRIORITY; ctx_lo = kernel_context(gt->i915, NULL); @@ -3394,6 +3391,9 @@ static int live_preempt_timeout(void *arg) goto err_ctx_hi; ctx_lo->sched.priority = I915_CONTEXT_MIN_USER_PRIORITY; + if (igt_spinner_init(&spin_lo, gt)) + goto err_ctx_lo; + for_each_engine(engine, gt, id) { unsigned long saved_timeout; struct i915_request *rq; @@ -3405,21 +3405,21 @@ static int live_preempt_timeout(void *arg) MI_NOOP); /* preemption disabled */ if (IS_ERR(rq)) { err = PTR_ERR(rq); - goto err_ctx_lo; + goto err_spin_lo; } i915_request_add(rq); if (!igt_wait_for_spinner(&spin_lo, rq)) { intel_gt_set_wedged(gt); err = -EIO; - goto err_ctx_lo; + goto err_spin_lo; } rq = igt_request_alloc(ctx_hi, engine); if (IS_ERR(rq)) { igt_spinner_end(&spin_lo); err = PTR_ERR(rq); - goto err_ctx_lo; + goto err_spin_lo; } /* Flush the previous CS ack before changing timeouts */ @@ -3439,7 +3439,7 @@ static int live_preempt_timeout(void *arg) intel_gt_set_wedged(gt); i915_request_put(rq); err = -ETIME; - goto err_ctx_lo; + goto err_spin_lo; } igt_spinner_end(&spin_lo); @@ -3447,12 +3447,12 @@ static int live_preempt_timeout(void *arg) } err = 0; +err_spin_lo: + igt_spinner_fini(&spin_lo); err_ctx_lo: kernel_context_close(ctx_lo); err_ctx_hi: kernel_context_close(ctx_hi); -err_spin_lo: - igt_spinner_fini(&spin_lo); return err; } diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index bb65563296b5..9d5a95dc58e1 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -138,8 +138,6 @@ int i915_gem_object_unbind(struct drm_i915_gem_object *obj, while (!ret && (vma = list_first_entry_or_null(&obj->vma.list, struct i915_vma, obj_link))) { - struct i915_address_space *vm = vma->vm; - list_move_tail(&vma->obj_link, &still_in_list); if (!i915_vma_is_bound(vma, I915_VMA_BIND_MASK)) continue; @@ -150,7 +148,7 @@ int i915_gem_object_unbind(struct drm_i915_gem_object *obj, } ret = -EAGAIN; - if (!i915_vm_tryopen(vm)) + if (!i915_vm_tryget(vma->vm)) break; /* Prevent vma being freed by i915_vma_parked as we unbind */ @@ -182,7 +180,7 @@ int i915_gem_object_unbind(struct drm_i915_gem_object *obj, __i915_vma_put(vma); } - i915_vm_close(vm); + i915_vm_put(vma->vm); spin_lock(&obj->vma.lock); } list_splice_init(&still_in_list, &obj->vma.list); diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c index 9c1582a473c6..f67186d0df31 100644 --- a/drivers/gpu/drm/i915/i915_vma.c +++ b/drivers/gpu/drm/i915/i915_vma.c @@ -46,7 +46,7 @@ static inline void assert_vma_held_evict(const struct i915_vma *vma) * This is the only exception to the requirement of the object lock * being held. */ - if (atomic_read(&vma->vm->open)) + if (kref_read(&vma->vm->ref)) assert_object_held_shared(vma->obj); } @@ -112,6 +112,7 @@ vma_create(struct drm_i915_gem_object *obj, struct i915_vma *pos = ERR_PTR(-E2BIG); struct i915_vma *vma; struct rb_node *rb, **p; + int err; /* The aliasing_ppgtt should never be used directly! */ GEM_BUG_ON(vm == &vm->gt->ggtt->alias->vm); @@ -121,7 +122,6 @@ vma_create(struct drm_i915_gem_object *obj, return ERR_PTR(-ENOMEM); kref_init(&vma->ref); - vma->vm = i915_vm_get(vm); vma->ops = &vm->vma_ops; vma->obj = obj; vma->size = obj->base.size; @@ -137,6 +137,8 @@ vma_create(struct drm_i915_gem_object *obj, } INIT_LIST_HEAD(&vma->closed_link); + INIT_LIST_HEAD(&vma->obj_link); + RB_CLEAR_NODE(&vma->obj_node); if (view && view->type != I915_GGTT_VIEW_NORMAL) { vma->ggtt_view = *view; @@ -162,8 +164,16 @@ vma_create(struct drm_i915_gem_object *obj, GEM_BUG_ON(!IS_ALIGNED(vma->size, I915_GTT_PAGE_SIZE)); - spin_lock(&obj->vma.lock); + err = mutex_lock_interruptible(&vm->mutex); + if (err) { + pos = ERR_PTR(err); + goto err_vma; + } + vma->vm = vm; + list_add_tail(&vma->vm_link, &vm->unbound_list); + + spin_lock(&obj->vma.lock); if (i915_is_ggtt(vm)) { if (unlikely(overflows_type(vma->size, u32))) goto err_unlock; @@ -221,13 +231,15 @@ vma_create(struct drm_i915_gem_object *obj, list_add_tail(&vma->obj_link, &obj->vma.list); spin_unlock(&obj->vma.lock); + mutex_unlock(&vm->mutex); return vma; err_unlock: spin_unlock(&obj->vma.lock); + list_del_init(&vma->vm_link); + mutex_unlock(&vm->mutex); err_vma: - i915_vm_put(vm); i915_vma_free(vma); return pos; } @@ -278,7 +290,7 @@ i915_vma_instance(struct drm_i915_gem_object *obj, struct i915_vma *vma; GEM_BUG_ON(view && !i915_is_ggtt_or_dpt(vm)); - GEM_BUG_ON(!atomic_read(&vm->open)); + GEM_BUG_ON(!kref_read(&vm->ref)); spin_lock(&obj->vma.lock); vma = i915_vma_lookup(obj, vm, view); @@ -321,7 +333,6 @@ static void __vma_release(struct dma_fence_work *work) i915_gem_object_put(vw->pinned); i915_vm_free_pt_stash(vw->vm, &vw->stash); - i915_vm_put(vw->vm); if (vw->vma_res) i915_vma_resource_put(vw->vma_res); } @@ -837,7 +848,7 @@ i915_vma_insert(struct i915_vma *vma, struct i915_gem_ww_ctx *ww, GEM_BUG_ON(!drm_mm_node_allocated(&vma->node)); GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, color)); - list_add_tail(&vma->vm_link, &vma->vm->bound_list); + list_move_tail(&vma->vm_link, &vma->vm->bound_list); return 0; } @@ -853,7 +864,7 @@ i915_vma_detach(struct i915_vma *vma) * vma, we can drop its hold on the backing storage and allow * it to be reaped by the shrinker. */ - list_del(&vma->vm_link); + list_move_tail(&vma->vm_link, &vma->vm->unbound_list); } static bool try_qad_pin(struct i915_vma *vma, unsigned int flags) @@ -1314,8 +1325,7 @@ int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww, goto err_rpm; } - work->vm = i915_vm_get(vma->vm); - + work->vm = vma->vm; dma_fence_work_chain(&work->base, moving); /* Allocate enough page directories to used PTE */ @@ -1563,7 +1573,6 @@ void i915_vma_release(struct kref *ref) { struct i915_vma *vma = container_of(ref, typeof(*vma), ref); - i915_vm_put(vma->vm); i915_active_fini(&vma->active); GEM_WARN_ON(vma->resource); i915_vma_free(vma); @@ -1579,7 +1588,7 @@ static void force_unbind(struct i915_vma *vma) GEM_BUG_ON(drm_mm_node_allocated(&vma->node)); } -static void release_references(struct i915_vma *vma) +static void release_references(struct i915_vma *vma, bool vm_ddestroy) { struct drm_i915_gem_object *obj = vma->obj; @@ -1589,10 +1598,14 @@ static void release_references(struct i915_vma *vma) list_del(&vma->obj_link); if (!RB_EMPTY_NODE(&vma->obj_node)) rb_erase(&vma->obj_node, &obj->vma.tree); + spin_unlock(&obj->vma.lock); __i915_vma_remove_closed(vma); + if (vm_ddestroy) + i915_vm_resv_put(vma->vm); + __i915_vma_put(vma); } @@ -1626,15 +1639,21 @@ void i915_vma_destroy_locked(struct i915_vma *vma) lockdep_assert_held(&vma->vm->mutex); force_unbind(vma); - release_references(vma); + list_del_init(&vma->vm_link); + release_references(vma, false); } void i915_vma_destroy(struct i915_vma *vma) { + bool vm_ddestroy; + mutex_lock(&vma->vm->mutex); force_unbind(vma); + list_del_init(&vma->vm_link); + vm_ddestroy = vma->vm_ddestroy; + vma->vm_ddestroy = false; mutex_unlock(&vma->vm->mutex); - release_references(vma); + release_references(vma, vm_ddestroy); } void i915_vma_parked(struct intel_gt *gt) @@ -1652,7 +1671,7 @@ void i915_vma_parked(struct intel_gt *gt) if (!kref_get_unless_zero(&obj->base.refcount)) continue; - if (!i915_vm_tryopen(vm)) { + if (!i915_vm_tryget(vm)) { i915_gem_object_put(obj); continue; } @@ -1678,7 +1697,7 @@ void i915_vma_parked(struct intel_gt *gt) } i915_gem_object_put(obj); - i915_vm_close(vm); + i915_vm_put(vm); } } @@ -1829,7 +1848,9 @@ struct dma_fence *__i915_vma_evict(struct i915_vma *vma, bool async) /* If vm is not open, unbind is a nop. */ vma_res->needs_wakeref = i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND) && - atomic_read(&vma->vm->open); + kref_read(&vma->vm->ref); + vma_res->skip_pte_rewrite = !kref_read(&vma->vm->ref) || + vma->vm->skip_pte_rewrite; trace_i915_vma_unbind(vma); unbind_fence = i915_vma_resource_unbind(vma_res); diff --git a/drivers/gpu/drm/i915/i915_vma_resource.c b/drivers/gpu/drm/i915/i915_vma_resource.c index 57ae92ba8af1..27c55027387a 100644 --- a/drivers/gpu/drm/i915/i915_vma_resource.c +++ b/drivers/gpu/drm/i915/i915_vma_resource.c @@ -178,7 +178,7 @@ static void i915_vma_resource_unbind_work(struct work_struct *work) bool lockdep_cookie; lockdep_cookie = dma_fence_begin_signalling(); - if (likely(atomic_read(&vm->open))) + if (likely(!vma_res->skip_pte_rewrite)) vma_res->ops->unbind_vma(vm, vma_res); dma_fence_end_signalling(lockdep_cookie); diff --git a/drivers/gpu/drm/i915/i915_vma_resource.h b/drivers/gpu/drm/i915/i915_vma_resource.h index 25913913baa6..5d8427caa2ba 100644 --- a/drivers/gpu/drm/i915/i915_vma_resource.h +++ b/drivers/gpu/drm/i915/i915_vma_resource.h @@ -62,6 +62,11 @@ struct i915_page_sizes { * deferred to a work item awaiting unsignaled fences. This is a hack. * (dma_fence_work uses a fence flag for this, but this seems slightly * cleaner). + * @needs_wakeref: Whether a wakeref is needed during unbind. Since we can't + * take a wakeref in the dma-fence signalling critical path, it needs to be + * taken when the unbind is scheduled. + * @skip_pte_rewrite: During ggtt suspend and vm takedown pte rewriting + * needs to be skipped for unbind. * * The lifetime of a struct i915_vma_resource is from a binding request to * the actual possible asynchronous unbind has completed. @@ -113,6 +118,7 @@ struct i915_vma_resource { bool allocated:1; bool immediate_unbind:1; bool needs_wakeref:1; + bool skip_pte_rewrite:1; }; bool i915_vma_resource_hold(struct i915_vma_resource *vma_res, diff --git a/drivers/gpu/drm/i915/i915_vma_types.h b/drivers/gpu/drm/i915/i915_vma_types.h index 88370dadca82..eac36be184e5 100644 --- a/drivers/gpu/drm/i915/i915_vma_types.h +++ b/drivers/gpu/drm/i915/i915_vma_types.h @@ -271,6 +271,13 @@ struct i915_vma { #define I915_VMA_PAGES_ACTIVE (BIT(24) | 1) atomic_t pages_count; /* number of active binds to the pages */ + /** + * Whether we hold a reference on the vm dma_resv lock to temporarily + * block vm freeing until the vma is destroyed. + * Protected by the vm mutex. + */ + bool vm_ddestroy; + /** * Support different GGTT views into the same object. * This means there can be multiple VMA mappings per object and per VM. diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c index ca4ed9dd909b..272560ece32e 100644 --- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c @@ -1204,7 +1204,7 @@ static int exercise_ppgtt(struct drm_i915_private *dev_priv, goto out_free; } GEM_BUG_ON(offset_in_page(ppgtt->vm.total)); - GEM_BUG_ON(!atomic_read(&ppgtt->vm.open)); + assert_vm_alive(&ppgtt->vm); err = func(&ppgtt->vm, 0, ppgtt->vm.total, end_time); @@ -1437,7 +1437,7 @@ static void track_vma_bind(struct i915_vma *vma) vma->resource->bi.pages = vma->pages; mutex_lock(&vma->vm->mutex); - list_add_tail(&vma->vm_link, &vma->vm->bound_list); + list_move_tail(&vma->vm_link, &vma->vm->bound_list); mutex_unlock(&vma->vm->mutex); }