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([2a01:599:904:96e0:a245:aa9f:6c57:eb41]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-438e23d42d4sm17055365e9.6.2025.01.30.01.28.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 30 Jan 2025 01:28:02 -0800 (PST) Message-ID: Date: Thu, 30 Jan 2025 10:28:00 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 2/4] mm/mmu_notifier: drop owner from MMU_NOTIFY_EXCLUSIVE To: Alistair Popple Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-mm@kvack.org, nouveau@lists.freedesktop.org, Andrew Morton , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , Jonathan Corbet , Alex Shi , Yanteng Si , Karol Herbst , Lyude Paul , Danilo Krummrich , David Airlie , Simona Vetter , "Liam R. 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: A47491C000D X-Stat-Signature: 73q9tfh36a7uuwf8rd9kyo3aq4eqscou X-Rspam-User: X-HE-Tag: 1738229286-23054 X-HE-Meta: U2FsdGVkX19ckr7jjiyVBvf3z0t/8wIBjkqU7yPq7atsTB4NMClZr9ZBokEbRZXsmIjhcXYTcydqgjdL/XbyQ+PDvz23r4xN0EE/7UjOXxijj+wC78FCb6XZrXbh/W/goe/bf9DDp6QLf3f7AD2coEsoEpYvHeiY7//K0081AZe1/amWdlCTDrrNGuvS1b0K/2Yf2IduJYYhAKm0gd5iU6ulje57Fer09WxOFHhmuH8L8kBHd2RWB31w+1sbLWsY0pXTuBuQ/obf+d+y/CW1ebnn3B13hmFgLODBPKcOo+/pqxLDR3NhJr6khXmdj6YKx3brNWQzuA8Bt76qCPxM4HU99KmyLGnGJtbPuPa2KfV9MvTFcT9W4LVZm28TglrFSotn0oNODe+BdQcud1kd3sKf5D4vYKzcHbNSi3gF8sDzqH/Fnrn5PpTVtdaEfG9WChl/Pfmm5IkPgsJWPKmlwXyq2sFKOnN+nTe2Gqak4JOMAVzG9cHT46ZgSVflNHcIlmiXSIXaw7q3XoN4sGSeOGdRsUzx6YLmKGL4nW8Y+Q/pCHZf/up3B7rekdwp6vE9orTahX6NEc+xDOwEE9eXjQLxjYz7by3I8O1r7XaqIzPCLb+MX+7YujXrP+Wd6jn23k5LSqhGsPO9fZcMcmtXk/QMSVuhjDQZ1DQvyInDcSUwT5N3Jk92kPmlF72Ml6UDEpy9OaR5G6U1cXNckrBFc3BIcj4yqhBt36mIL++Dzey+5My4H6vQoWWz4ipda7lNMaB4tIC6f6zY3bemFGZBL9u0YllPFDyo2X5HLtXrvUxwTHBmvn+FT7EkPPjJ+9NmHAmNLB+kH7iz3MNwrD1PQ02ItICtjz5YskCjpDjjwN2+0EpL5gkUnaC/IBZ4psHtW4jyQ1UHdNCHheMjAIcNGEjLNyK0eY2bhGpgY51vpabgV0yR/GmZOCxIXmaHrAfG7is7y8rPSsIOr+goFTb 0vgh5IxR 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 30.01.25 06:34, Alistair Popple wrote: > On Wed, Jan 29, 2025 at 12:58:00PM +0100, David Hildenbrand wrote: >> We no longer get a MMU_NOTIFY_EXCLUSIVE on conversion with the owner set >> that one has to filter out: if there already *is* a device-exclusive >> entry (e.g., other device, we don't have that information), GUP will >> convert it back to an ordinary PTE and notify via >> remove_device_exclusive_entry(). > > What tree is this against? I tried applying to v6.13 and Linus current master > but neither applied cleanly. See the cover letter. This is on top of the fixes series, which is based on mm-unstable from yesterday. > >> Signed-off-by: David Hildenbrand >> --- >> drivers/gpu/drm/nouveau/nouveau_svm.c | 6 +----- >> include/linux/mmu_notifier.h | 4 +--- >> include/linux/rmap.h | 2 +- >> lib/test_hmm.c | 2 +- >> mm/rmap.c | 3 +-- >> 5 files changed, 5 insertions(+), 12 deletions(-) >> >> diff --git a/drivers/gpu/drm/nouveau/nouveau_svm.c b/drivers/gpu/drm/nouveau/nouveau_svm.c >> index 39e3740980bb..4758fee182b4 100644 >> --- a/drivers/gpu/drm/nouveau/nouveau_svm.c >> +++ b/drivers/gpu/drm/nouveau/nouveau_svm.c >> @@ -510,10 +510,6 @@ static bool nouveau_svm_range_invalidate(struct mmu_interval_notifier *mni, >> struct svm_notifier *sn = >> container_of(mni, struct svm_notifier, notifier); >> >> - if (range->event == MMU_NOTIFY_EXCLUSIVE && >> - range->owner == sn->svmm->vmm->cli->drm->dev) >> - return true; > > I think this will cause a live-lock because make_device_exclusive_range() > will call the notifier which without the filtering will increment the sequence > count and cause endless retries of the loop in nouveau_atomic_range_fault(). > The notifier needs to be able to figure out if it was called in response to > something this thread did (ie. make_device_exclusive_range) and can therefore > ignore the invalidation, or from some other thread. Yes, as discussed in the other patch, this must stay to inform secondary MMUs about the conversion *to* device exclusive. > > Looking at hmm_test I see that doesn't use the sequence counter to ensure > the PTE remains valid whilst it is mapped. I think that is probably wrong, so > apologies if that lead you astray. Yes, the hmm_test does not completely follow the same model the nouveau implementation does; so it might not be completely correct. -- Cheers, David / dhildenb