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h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hZ9tbK6alrLBbs0gi/RA/rTTHk4Szr/ALK9qb/ljV5Z39ltd2AcQcwhzALpCC1wKd GIeCnfcSDRZCYwM84p9o8SFEII+jFkZGxJDmCb1a1V3QFisDxrwsPRClaYIO9y61bo AS1FoX6+/lM0tmj1WVEb896g3y43UOh3+1q2HAqg= From: Allen Pais To: linux-kernel@vger.kernel.org Cc: tj@kernel.org, keescook@chromium.org, vkoul@kernel.org, marcan@marcan.st, sven@svenpeter.dev, florian.fainelli@broadcom.com, rjui@broadcom.com, sbranden@broadcom.com, paul@crapouillou.net, Eugeniy.Paltsev@synopsys.com, manivannan.sadhasivam@linaro.org, vireshk@kernel.org, Frank.Li@nxp.com, leoyang.li@nxp.com, zw@zh-kernel.org, wangzhou1@hisilicon.com, haijie1@huawei.com, shawnguo@kernel.org, s.hauer@pengutronix.de, sean.wang@mediatek.com, matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, afaerber@suse.de, logang@deltatee.com, daniel@zonque.org, haojian.zhuang@gmail.com, robert.jarzmik@free.fr, andersson@kernel.org, konrad.dybcio@linaro.org, orsonzhai@gmail.com, baolin.wang@linux.alibaba.com, zhang.lyra@gmail.com, patrice.chotard@foss.st.com, linus.walleij@linaro.org, wens@csie.org, jernej.skrabec@gmail.com, peter.ujfalusi@gmail.com, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, jassisinghbrar@gmail.com, mchehab@kernel.org, maintainers@bluecherrydvr.com, aubin.constans@microchip.com, ulf.hansson@linaro.org, manuel.lauss@gmail.com, mirq-linux@rere.qmqm.pl, jh80.chung@samsung.com, oakad@yahoo.com, hayashi.kunihiko@socionext.com, mhiramat@kernel.org, brucechang@via.com.tw, HaraldWelte@viatech.com, pierre@ossman.eu, duncan.sands@free.fr, stern@rowland.harvard.edu, oneukum@suse.com, openipmi-developer@lists.sourceforge.net, dmaengine@vger.kernel.org, asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org, linux-mips@vger.kernel.org, imx@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-mediatek@lists.infradead.org, linux-actions@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, linux-mmc@vger.kernel.org, linux-omap@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-s390@vger.kernel.org, netdev@vger.kernel.org, linux-usb@vger.kernel.org Subject: [PATCH 5/9] mailbox: Convert from tasklet to BH workqueue Date: Wed, 27 Mar 2024 16:03:10 +0000 Message-Id: <20240327160314.9982-6-apais@linux.microsoft.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240327160314.9982-1-apais@linux.microsoft.com> References: <20240327160314.9982-1-apais@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The only generic interface to execute asynchronously in the BH context is tasklet; however, it's marked deprecated and has some design flaws. To replace tasklets, BH workqueue support was recently added. A BH workqueue behaves similarly to regular workqueues except that the queued work items are executed in the BH context. This patch converts drivers/infiniband/* from tasklet to BH workqueue. Based on the work done by Tejun Heo Branch: https://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git for-6.10 Signed-off-by: Allen Pais --- drivers/mailbox/bcm-pdc-mailbox.c | 21 +++++++++++---------- drivers/mailbox/imx-mailbox.c | 16 ++++++++-------- 2 files changed, 19 insertions(+), 18 deletions(-) diff --git a/drivers/mailbox/bcm-pdc-mailbox.c b/drivers/mailbox/bcm-pdc-ma= ilbox.c index 1768d3d5aaa0..242e7504a628 100644 --- a/drivers/mailbox/bcm-pdc-mailbox.c +++ b/drivers/mailbox/bcm-pdc-mailbox.c @@ -43,6 +43,7 @@ #include #include #include +#include =20 #define PDC_SUCCESS 0 =20 @@ -293,8 +294,8 @@ struct pdc_state { =20 unsigned int pdc_irq; =20 - /* tasklet for deferred processing after DMA rx interrupt */ - struct tasklet_struct rx_tasklet; + /* work for deferred processing after DMA rx interrupt */ + struct work_struct rx_work; =20 /* Number of bytes of receive status prior to each rx frame */ u32 rx_status_len; @@ -952,18 +953,18 @@ static irqreturn_t pdc_irq_handler(int irq, void *dat= a) iowrite32(intstatus, pdcs->pdc_reg_vbase + PDC_INTSTATUS_OFFSET); =20 /* Wakeup IRQ thread */ - tasklet_schedule(&pdcs->rx_tasklet); + queue_work(system_bh_wq, &pdcs->rx_work); return IRQ_HANDLED; } =20 /** - * pdc_tasklet_cb() - Tasklet callback that runs the deferred processing a= fter + * pdc_work_cb() - Work callback that runs the deferred processing after * a DMA receive interrupt. Reenables the receive interrupt. * @t: Pointer to the Altera sSGDMA channel structure */ -static void pdc_tasklet_cb(struct tasklet_struct *t) +static void pdc_work_cb(struct work_struct *t) { - struct pdc_state *pdcs =3D from_tasklet(pdcs, t, rx_tasklet); + struct pdc_state *pdcs =3D from_work(pdcs, t, rx_work); =20 pdc_receive(pdcs); =20 @@ -1577,8 +1578,8 @@ static int pdc_probe(struct platform_device *pdev) =20 pdc_hw_init(pdcs); =20 - /* Init tasklet for deferred DMA rx processing */ - tasklet_setup(&pdcs->rx_tasklet, pdc_tasklet_cb); + /* Init work for deferred DMA rx processing */ + INIT_WORK(&pdcs->rx_work, pdc_work_cb); =20 err =3D pdc_interrupts_init(pdcs); if (err) @@ -1595,7 +1596,7 @@ static int pdc_probe(struct platform_device *pdev) return PDC_SUCCESS; =20 cleanup_buf_pool: - tasklet_kill(&pdcs->rx_tasklet); + cancel_work_sync(&pdcs->rx_work); dma_pool_destroy(pdcs->rx_buf_pool); =20 cleanup_ring_pool: @@ -1611,7 +1612,7 @@ static void pdc_remove(struct platform_device *pdev) =20 pdc_free_debugfs(); =20 - tasklet_kill(&pdcs->rx_tasklet); + cancel_work_sync(&pdcs->rx_work); =20 pdc_hw_disable(pdcs); =20 diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c index 5c1d09cad761..933727f89431 100644 --- a/drivers/mailbox/imx-mailbox.c +++ b/drivers/mailbox/imx-mailbox.c @@ -21,6 +21,7 @@ #include #include #include +#include =20 #include "mailbox.h" =20 @@ -80,7 +81,7 @@ struct imx_mu_con_priv { char irq_desc[IMX_MU_CHAN_NAME_SIZE]; enum imx_mu_chan_type type; struct mbox_chan *chan; - struct tasklet_struct txdb_tasklet; + struct work_struct txdb_work; }; =20 struct imx_mu_priv { @@ -232,7 +233,7 @@ static int imx_mu_generic_tx(struct imx_mu_priv *priv, break; case IMX_MU_TYPE_TXDB: imx_mu_xcr_rmw(priv, IMX_MU_GCR, IMX_MU_xCR_GIRn(priv->dcfg->type, cp->i= dx), 0); - tasklet_schedule(&cp->txdb_tasklet); + queue_work(system_bh_wq, &cp->txdb_work); break; case IMX_MU_TYPE_TXDB_V2: imx_mu_xcr_rmw(priv, IMX_MU_GCR, IMX_MU_xCR_GIRn(priv->dcfg->type, cp->i= dx), 0); @@ -420,7 +421,7 @@ static int imx_mu_seco_tx(struct imx_mu_priv *priv, str= uct imx_mu_con_priv *cp, } =20 /* Simulate hack for mbox framework */ - tasklet_schedule(&cp->txdb_tasklet); + queue_work(system_bh_wq, &cp->txdb_work); =20 break; default: @@ -484,9 +485,9 @@ static int imx_mu_seco_rxdb(struct imx_mu_priv *priv, s= truct imx_mu_con_priv *cp return err; } =20 -static void imx_mu_txdb_tasklet(unsigned long data) +static void imx_mu_txdb_work(struct work_struct *t) { - struct imx_mu_con_priv *cp =3D (struct imx_mu_con_priv *)data; + struct imx_mu_con_priv *cp =3D from_work(cp, t, txdb_work); =20 mbox_chan_txdone(cp->chan, 0); } @@ -570,8 +571,7 @@ static int imx_mu_startup(struct mbox_chan *chan) =20 if (cp->type =3D=3D IMX_MU_TYPE_TXDB) { /* Tx doorbell don't have ACK support */ - tasklet_init(&cp->txdb_tasklet, imx_mu_txdb_tasklet, - (unsigned long)cp); + INIT_WORK(&cp->txdb_work, imx_mu_txdb_work); return 0; } =20 @@ -615,7 +615,7 @@ static void imx_mu_shutdown(struct mbox_chan *chan) } =20 if (cp->type =3D=3D IMX_MU_TYPE_TXDB) { - tasklet_kill(&cp->txdb_tasklet); + cancel_work_sync(&cp->txdb_work); pm_runtime_put_sync(priv->dev); return; } --=20 2.17.1