From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B9EAF37DEB9; Thu, 21 May 2026 23:42:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779406939; cv=none; b=jp8zpjU/gFMpIaGv1mj6n429F91qwtI5lm3UU3ipJOcZZlHM/b4eCPp9NEut947+Ka1XaYsDZ8httVT71nUt5Gz6PqfR1w4d/fMawZRTTHB9BrNycgaRZi3Nd5U/A6N+TihDI9Gn5lv5hl9vEgaTGywDkzY76w+511kzPRCj+KM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779406939; c=relaxed/simple; bh=9TiMPMFi9DqkpvtnjcM0UBtE0MRykgEWhUsOuQopYuI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WAA1bkD0vKIM29bWta9Hcbi2KxcnL1MuOKgBOKwgVxZsQWoXDzTu4NtDH7JPHWrMPUJw4E5odO0rdbUYIYvUHyPI83dha7VXdxDwm8jJktp3/3HVYLxQ8xQ+KPz25NuH7g9153jHZB8Ss1mjz0DZ4mLpoOubXwWDV66MNsBhLls= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ISmCq4b9; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ISmCq4b9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 130BE1F00A3C; Thu, 21 May 2026 23:42:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779406931; bh=dt2mnOGqU/dqsuuyNJuAquOOYfNTnXCcO5ozbuHU/2c=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ISmCq4b9VzLkR0djpnh6Fmawpyk8xNpakXw7NeNDJ3TJiol7XZ+aYh+98jtzXjO2q I1Oov7EHyhGVxh4FLSoCSKVIJfeahDEzWHwDVPFbJsyPJoqhZtxHKHDOdx/SmBmk1M J42rYG2jP0CuWMAYvafiLcgmtgCfuGY1IpTEbZByMszZsJU5IKJjiJ4UQlZMRLu5p7 ul0pD7/uQ6nkHYmzOZQPyqx1lraJRzqisbTV7XXezAhPAxMGjMXSu4QzdaoY5/U+Z4 XmM5/L10wpsekjXKskd3l0MqKITM+V8EsoryqS93IZ28xeMPDonHdPqUjB7BucVHpe Vzs7p6ZwRu7jg== From: Danilo Krummrich To: gregkh@linuxfoundation.org, rafael@kernel.org, acourbot@nvidia.com, aliceryhl@google.com, david.m.ertman@intel.com, ira.weiny@intel.com, leon@kernel.org, viresh.kumar@linaro.org, m.wilczynski@samsung.com, ukleinek@kernel.org, bhelgaas@google.com, kwilczynski@kernel.org, abdiel.janulgue@gmail.com, robin.murphy@arm.com, markus.probst@posteo.de, ojeda@kernel.org, boqun@kernel.org, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, tmgross@umich.edu, igor.korotin@linux.dev, daniel.almeida@collabora.com, pcolberg@redhat.com Cc: driver-core@lists.linux.dev, linux-kernel@vger.kernel.org, nova-gpu@lists.linux.dev, dri-devel@lists.freedesktop.org, linux-pm@vger.kernel.org, linux-pwm@vger.kernel.org, linux-pci@vger.kernel.org, rust-for-linux@vger.kernel.org, Danilo Krummrich , Eliot Courtney Subject: [PATCH REF v4 25/27] gpu: nova-core: unregister sysmem flush page from Drop Date: Fri, 22 May 2026 01:34:51 +0200 Message-ID: <20260521233501.1191842-26-dakr@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260521233501.1191842-1-dakr@kernel.org> References: <20260521233501.1191842-1-dakr@kernel.org> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Now that SysmemFlush can borrow the Bar via HRT lifetime, store a &'bound Bar0 reference and implement Drop to automatically unregister the sysmem flush page. This removes the need for manual unregister() calls and the Gpu::unbind() method. Reported-by: Eliot Courtney Closes: https://lore.kernel.org/all/20260409-fix-systemflush-v1-1-a1d6c968f17c@nvidia.com/ Fixes: 6554ad65b589 ("gpu: nova-core: register sysmem flush page") Signed-off-by: Danilo Krummrich --- drivers/gpu/nova-core/driver.rs | 4 ---- drivers/gpu/nova-core/fb.rs | 22 ++++++++++------------ drivers/gpu/nova-core/gpu.rs | 9 +-------- 3 files changed, 11 insertions(+), 24 deletions(-) diff --git a/drivers/gpu/nova-core/driver.rs b/drivers/gpu/nova-core/driver.rs index d4cf4379ee87..cff5034c2dcd 100644 --- a/drivers/gpu/nova-core/driver.rs +++ b/drivers/gpu/nova-core/driver.rs @@ -113,8 +113,4 @@ fn probe<'bound>( })) }) } - - fn unbind<'bound>(_pdev: &'bound pci::Device>, this: Pin<&Self::Data<'bound>>) { - this.gpu.unbind(); - } } diff --git a/drivers/gpu/nova-core/fb.rs b/drivers/gpu/nova-core/fb.rs index bdd5eed760e1..64fe5f27f41e 100644 --- a/drivers/gpu/nova-core/fb.rs +++ b/drivers/gpu/nova-core/fb.rs @@ -46,21 +46,20 @@ /// Because of this, the sysmem flush memory page must be registered as early as possible during /// driver initialization, and before any falcon is reset. /// -/// Users are responsible for manually calling [`Self::unregister`] before dropping this object, -/// otherwise the GPU might still use it even after it has been freed. -pub(crate) struct SysmemFlush { +pub(crate) struct SysmemFlush<'sys> { /// Chipset we are operating on. chipset: Chipset, device: ARef, + bar: &'sys Bar0, /// Keep the page alive as long as we need it. page: CoherentHandle, } -impl SysmemFlush { +impl<'sys> SysmemFlush<'sys> { /// Allocate a memory page and register it as the sysmem flush page. pub(crate) fn register( dev: &device::Device, - bar: &Bar0, + bar: &'sys Bar0, chipset: Chipset, ) -> Result { let page = CoherentHandle::alloc(dev, kernel::page::PAGE_SIZE, GFP_KERNEL)?; @@ -70,19 +69,18 @@ pub(crate) fn register( Ok(Self { chipset, device: dev.into(), + bar, page, }) } +} - /// Unregister the managed sysmem flush page. - /// - /// In order to gracefully tear down the GPU, users must make sure to call this method before - /// dropping the object. - pub(crate) fn unregister(&self, bar: &Bar0) { +impl Drop for SysmemFlush<'_> { + fn drop(&mut self) { let hal = hal::fb_hal(self.chipset); - if hal.read_sysmem_flush_page(bar) == self.page.dma_handle() { - let _ = hal.write_sysmem_flush_page(bar, 0).inspect_err(|e| { + if hal.read_sysmem_flush_page(self.bar) == self.page.dma_handle() { + let _ = hal.write_sysmem_flush_page(self.bar, 0).inspect_err(|e| { dev_warn!( &self.device, "failed to unregister sysmem flush page: {:?}\n", diff --git a/drivers/gpu/nova-core/gpu.rs b/drivers/gpu/nova-core/gpu.rs index 8d2d6b0a917b..c907d11580d6 100644 --- a/drivers/gpu/nova-core/gpu.rs +++ b/drivers/gpu/nova-core/gpu.rs @@ -228,7 +228,7 @@ pub(crate) struct Gpu<'gpu> { bar: &'gpu Bar0, /// System memory page required for flushing all pending GPU-side memory writes done through /// PCIE into system memory, via sysmembar (A GPU-initiated HW memory-barrier operation). - sysmem_flush: SysmemFlush, + sysmem_flush: SysmemFlush<'gpu>, /// GSP falcon instance, used for GSP boot up and cleanup. gsp_falcon: Falcon, /// SEC2 falcon instance, used for GSP boot up and cleanup. @@ -271,11 +271,4 @@ pub(crate) fn new( _: { gsp.boot(pdev, bar, spec.chipset, gsp_falcon, sec2_falcon)? }, }) } - - /// Called when the corresponding [`Device`](device::Device) is unbound. - /// - /// Note: This method must only be called from `Driver::unbind`. - pub(crate) fn unbind(&self) { - self.sysmem_flush.unregister(self.bar); - } } -- 2.54.0