From nobody Wed Dec 17 10:43:12 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 591B2219E8 for ; Sun, 11 May 2025 16:35:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746981327; cv=none; b=eleyAhVecWA+xem8Nz2sltJqjEkxajRkuoKOesgzNbDBDF+FyMjh6Sp/4KFqU6B6jU64NB8KGPEN1ujUKntCHCEJoH46kMCsfKGggCOlnhyjJ/hd/tg9CUUf8GZUhcUOiRFwJv1947Opitov2JBg9UIjOMbgc7Yf3foEgqQgjCA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746981327; c=relaxed/simple; bh=GaOQnEbLL9GZs6ot00bxwo1vTakAiiwicLKpRgJPfmY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=aj8mc9EiDxfcWpPIh/H9/skrlIauGhpf0GA/7G57WuDijQ5niCy6gBWODz1+2qtmwiiAaGZcO/Pi4EeMrwG3Vv7+q8SxoTOATMl10Cpf5NY156JE4zh+vazp9OCmpch8pidC2KpAyqH8NX8XvTzv6r0o7/7fdmrlgsy3jFd/BT8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fTTKFRdM; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="fTTKFRdM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F22E4C4CEE7; Sun, 11 May 2025 16:35:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746981327; bh=GaOQnEbLL9GZs6ot00bxwo1vTakAiiwicLKpRgJPfmY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fTTKFRdM3VnzPD88jFOf2OV/Rw99Y5XQlU1eZ6IgHDHKwj6ZnakTwEXRbIWvqGMFQ qJsyHuz6iw2qAOIeJylFbITR9Ls2d3geAGDGwJ4aQLjQGYG7vNLm96albse7nEdLje wESOJmauQV1z8L3epNxV85hxSCVp2SC3PZAf+jtlWoSQjlnab9xG+JXr/jnGJNteL2 67f2x0zVBwuUb/m+3LMKlsu80JJGqH2Tn9l+nZ2yt7oqTtCFV/xt3zDU2vnlus6pCI guT6JyN6qv6lvLzDPrJarxXzRgSlp6ZE6yPZ3qx6yibhOD9KkfLsLK+RyTxXZeb0EC TksPyGnhgkvgA== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1uE9e8-00Dt22-L7; Sun, 11 May 2025 17:35:24 +0100 From: Marc Zyngier To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Thomas Gleixner , Lorenzo Pieralisi , Sascha Bischoff , Timothy Hayes Subject: [PATCH 1/4] genirq/msi: Add .msi_teardown() callback as the reverse of .msi_prepare() Date: Sun, 11 May 2025 17:35:17 +0100 Message-Id: <20250511163520.1307654-2-maz@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20250511163520.1307654-1-maz@kernel.org> References: <20250511163520.1307654-1-maz@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, tglx@linutronix.de, lpieralisi@kernel.org, sascha.bischoff@arm.com, timothy.hayes@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Content-Type: text/plain; charset="utf-8" While the MSI ops do have a .msi_prepare() callback that is responsible for setting up the relevant (usually per-device) allocation, we don't have a callback reversing this setup. For this purpose, let's a .msi_teardown() callback. This is reliying on the msi_domain_info structure having a non-NULL alloc_data field. Nobody is populating this field yet, so there is no change in behaviour yet. Signed-off-by: Marc Zyngier --- include/linux/msi.h | 10 ++++++++-- kernel/irq/msi.c | 12 ++++++++++++ 2 files changed, 20 insertions(+), 2 deletions(-) diff --git a/include/linux/msi.h b/include/linux/msi.h index 86e42742fd0fb..0a44a2cba3105 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -420,6 +420,7 @@ struct msi_domain_info; * @msi_init: Domain specific init function for MSI interrupts * @msi_free: Domain specific function to free a MSI interrupts * @msi_prepare: Prepare the allocation of the interrupts in the domain + * @msi_teardown: Reverse the effects of @msi_prepare * @prepare_desc: Optional function to prepare the allocated MSI descriptor * in the domain * @set_desc: Set the msi descriptor for an interrupt @@ -435,8 +436,9 @@ struct msi_domain_info; * @get_hwirq, @msi_init and @msi_free are callbacks used by the underlying * irqdomain. * - * @msi_check, @msi_prepare, @prepare_desc and @set_desc are callbacks use= d by the - * msi_domain_alloc/free_irqs*() variants. + * @msi_check, @msi_prepare, @msi_teardown, @prepare_desc and + * @set_desc are callbacks used by the msi_domain_alloc/free_irqs*() + * variants. * * @domain_alloc_irqs, @domain_free_irqs can be used to override the * default allocation/free functions (__msi_domain_alloc/free_irqs). This @@ -458,6 +460,8 @@ struct msi_domain_ops { int (*msi_prepare)(struct irq_domain *domain, struct device *dev, int nvec, msi_alloc_info_t *arg); + void (*msi_teardown)(struct irq_domain *domain, + msi_alloc_info_t *arg); void (*prepare_desc)(struct irq_domain *domain, msi_alloc_info_t *arg, struct msi_desc *desc); void (*set_desc)(msi_alloc_info_t *arg, @@ -486,6 +490,7 @@ struct msi_domain_ops { * @handler: Optional: associated interrupt flow handler * @handler_data: Optional: associated interrupt flow handler data * @handler_name: Optional: associated interrupt flow handler name + * @alloc_data: Optional: associated interrupt allocation data * @data: Optional: domain specific data */ struct msi_domain_info { @@ -498,6 +503,7 @@ struct msi_domain_info { irq_flow_handler_t handler; void *handler_data; const char *handler_name; + msi_alloc_info_t *alloc_data; void *data; }; =20 diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index c05ba7ca00faa..a65ccf19b15d9 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -796,6 +796,11 @@ static int msi_domain_ops_prepare(struct irq_domain *d= omain, struct device *dev, return 0; } =20 +static void msi_domain_ops_teardown(struct irq_domain *domain, + msi_alloc_info_t *arg) +{ +} + static void msi_domain_ops_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc) { @@ -821,6 +826,7 @@ static struct msi_domain_ops msi_domain_ops_default =3D= { .get_hwirq =3D msi_domain_ops_get_hwirq, .msi_init =3D msi_domain_ops_init, .msi_prepare =3D msi_domain_ops_prepare, + .msi_teardown =3D msi_domain_ops_teardown, .set_desc =3D msi_domain_ops_set_desc, }; =20 @@ -842,6 +848,8 @@ static void msi_domain_update_dom_ops(struct msi_domain= _info *info) ops->msi_init =3D msi_domain_ops_default.msi_init; if (ops->msi_prepare =3D=3D NULL) ops->msi_prepare =3D msi_domain_ops_default.msi_prepare; + if (ops->msi_teardown =3D=3D NULL) + ops->msi_teardown =3D msi_domain_ops_default.msi_teardown; if (ops->set_desc =3D=3D NULL) ops->set_desc =3D msi_domain_ops_default.set_desc; } @@ -1088,6 +1096,10 @@ void msi_remove_device_irq_domain(struct device *dev= , unsigned int domid) =20 dev->msi.data->__domains[domid].domain =3D NULL; info =3D domain->host_data; + + if (info->alloc_data) + info->ops->msi_teardown(domain, info->alloc_data); + if (irq_domain_is_msi_device(domain)) fwnode =3D domain->fwnode; irq_domain_remove(domain); --=20 2.39.2