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From: Robin Gong <yibin.gong@nxp.com>
To: Lucas Stach <l.stach@pengutronix.de>,
	"vkoul@kernel.org" <vkoul@kernel.org>,
	"mark.rutland@arm.com" <mark.rutland@arm.com>,
	"broonie@kernel.org" <broonie@kernel.org>,
	"robh+dt@kernel.org" <robh+dt@kernel.org>,
	"catalin.marinas@arm.com" <catalin.marinas@arm.com>,
	"will.deacon@arm.com" <will.deacon@arm.com>,
	"shawnguo@kernel.org" <shawnguo@kernel.org>,
	"festevam@gmail.com" <festevam@gmail.com>,
	"s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
	"martin.fuzzey@flowbird.group" <martin.fuzzey@flowbird.group>,
	"u.kleine-koenig@pengutronix.de" <u.kleine-koenig@pengutronix.de>,
	"dan.j.williams@intel.com" <dan.j.williams@intel.com>,
	"matthias.schiffer@ew.tq-group.com" 
	<matthias.schiffer@ew.tq-group.com>,
	"frieder.schrempf@kontron.de" <frieder.schrempf@kontron.de>,
	"m.felsch@pengutronix.de" <m.felsch@pengutronix.de>,
	Clark Wang <xiaoning.wang@nxp.com>
Cc: "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-spi@vger.kernel.org" <linux-spi@vger.kernel.org>,
	dl-linux-imx <linux-imx@nxp.com>,
	"kernel@pengutronix.de" <kernel@pengutronix.de>,
	"dmaengine@vger.kernel.org" <dmaengine@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>
Subject: RE: [PATCH v14 05/12] dmaengine: dma: imx-sdma: add fw_loaded and is_ram_script
Date: Mon, 12 Jul 2021 03:20:21 +0000	[thread overview]
Message-ID: <VE1PR04MB668833FAAEEA2F5D0C076A6C89159@VE1PR04MB6688.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <17cadf46f4a0f9771fdde1c9aba9ffecb20efc9f.camel@pengutronix.de>

On 09/07/21 17:25 Lucas Stach <l.stach@pengutronix.de> wrote:
> Am Mittwoch, dem 07.04.2021 um 23:30 +0800 schrieb Robin Gong:
> > Add 'fw_loaded' and 'is_ram_script' to check if the script used by
> > channel is ram script and it's loaded or not, so that could prevent
> > meaningless following malloc dma descriptor and bd allocate in
> > sdma_transfer_init(), otherwise memory may be consumed out potentially
> > without free in case that spi fallback into pio while dma transfer
> > failed by sdma firmware not ready(next ERR009165 patch depends on sdma
> RAM scripts/firmware).
> >
> > Signed-off-by: Robin Gong <yibin.gong@nxp.com>
> > Acked-by: Vinod Koul <vkoul@kernel.org>
> > ---
> >  drivers/dma/imx-sdma.c | 13 +++++++++++++
> >  1 file changed, 13 insertions(+)
> >
> > diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index
> > 1c636d2..78dcfe2 100644
> > --- a/drivers/dma/imx-sdma.c
> > +++ b/drivers/dma/imx-sdma.c
> > @@ -381,6 +381,7 @@ struct sdma_channel {
> >  	enum dma_status			status;
> >  	struct imx_dma_data		data;
> >  	struct work_struct		terminate_worker;
> > +	bool				is_ram_script;
> >  };
> >
> >  #define IMX_DMA_SG_LOOP		BIT(0)
> > @@ -444,6 +445,7 @@ struct sdma_engine {
> >  	struct sdma_buffer_descriptor	*bd0;
> >  	/* clock ratio for AHB:SDMA core. 1:1 is 1, 2:1 is 0*/
> >  	bool				clk_ratio;
> > +	bool                            fw_loaded;
> >  };
> >
> >  static int sdma_config_write(struct dma_chan *chan, @@ -899,6 +901,7
> > @@ static void sdma_get_pc(struct sdma_channel *sdmac,
> >  	case IMX_DMATYPE_SSI_DUAL:
> >  		per_2_emi = sdma->script_addrs->ssish_2_mcu_addr;
> >  		emi_2_per = sdma->script_addrs->mcu_2_ssish_addr;
> > +		sdmac->is_ram_script = true;
> >  		break;
> >  	case IMX_DMATYPE_SSI_SP:
> >  	case IMX_DMATYPE_MMC:
> > @@ -913,6 +916,7 @@ static void sdma_get_pc(struct sdma_channel
> *sdmac,
> >  		per_2_emi = sdma->script_addrs->asrc_2_mcu_addr;
> >  		emi_2_per = sdma->script_addrs->asrc_2_mcu_addr;
> >  		per_2_per = sdma->script_addrs->per_2_per_addr;
> > +		sdmac->is_ram_script = true;
> >  		break;
> >  	case IMX_DMATYPE_ASRC_SP:
> >  		per_2_emi = sdma->script_addrs->shp_2_mcu_addr;
> > @@ -1309,6 +1313,11 @@ static struct sdma_desc
> > *sdma_transfer_init(struct sdma_channel *sdmac,  {
> >  	struct sdma_desc *desc;
> >
> > +	if (!sdmac->sdma->fw_loaded && sdmac->is_ram_script) {
> > +		dev_warn_once(sdmac->sdma->dev, "sdma firmware not ready!\n");
> > +		goto err_out;
> > +	}
> > +
> >  	desc = kzalloc((sizeof(*desc)), GFP_NOWAIT);
> >  	if (!desc)
> >  		goto err_out;
> > @@ -1559,6 +1568,8 @@ static int sdma_config_write(struct dma_chan
> > *chan,  {
> >  	struct sdma_channel *sdmac = to_sdma_chan(chan);
> >
> > +	sdmac->is_ram_script = false;
> > +
> While it's working correctly, I find it confusing to have this initialization at this
> point in the code. Please fold this into sdma_get_pc(), where it gets changed as
> needed.
Here 'is_ram_script = false' just clear is_ram_script so that the later sdma_get_pc()
could set is_ram_script correctly if it's a ram script. Yes, move it to early part of sdma_get_pc
also works.

> 
> Other than this small issue, this patch is:
> Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
> 
> >  	if (direction == DMA_DEV_TO_MEM) {
> >  		sdmac->per_address = dmaengine_cfg->src_addr;
> >  		sdmac->watermark_level = dmaengine_cfg->src_maxburst * @@
> -1738,6
> > +1749,8 @@ static void sdma_load_firmware(const struct firmware *fw,
> > void *context)
> >
> >  	sdma_add_scripts(sdma, addr);
> >
> > +	sdma->fw_loaded = true;
> > +
> >  	dev_info(sdma->dev, "loaded firmware %d.%d\n",
> >  			header->version_major,
> >  			header->version_minor);
> 


  reply	other threads:[~2021-07-12  3:20 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-07 15:30 [PATCH v14 00/12] add ecspi ERR009165 for i.mx6/7 soc family Robin Gong
2021-04-07 15:30 ` [PATCH v14 01/12] Revert "ARM: dts: imx6q: Use correct SDMA script for SPI5 core" Robin Gong
2021-04-07 15:30 ` [PATCH v14 02/12] Revert "ARM: dts: imx6: Use correct SDMA script for SPI cores" Robin Gong
2021-04-07 15:30 ` [PATCH v14 03/12] Revert "dmaengine: imx-sdma: refine to load context only once" Robin Gong
2021-04-07 15:30 ` [PATCH v14 04/12] dmaengine: imx-sdma: remove duplicated sdma_load_context Robin Gong
2021-04-07 15:30 ` [PATCH v14 05/12] dmaengine: dma: imx-sdma: add fw_loaded and is_ram_script Robin Gong
2021-07-09  9:24   ` Lucas Stach
2021-07-12  3:20     ` Robin Gong [this message]
2021-04-07 15:30 ` [PATCH v14 06/12] dmaengine: imx-sdma: add mcu_2_ecspi script Robin Gong
2021-07-09  9:32   ` Lucas Stach
2021-04-07 15:30 ` [PATCH v14 07/12] spi: imx: fix ERR009165 Robin Gong
2021-07-09  9:35   ` Lucas Stach
2021-04-07 15:30 ` [PATCH v14 08/12] spi: imx: remove ERR009165 workaround on i.mx6ul Robin Gong
2021-07-09  9:41   ` Lucas Stach
2021-07-12  3:48     ` Robin Gong
2021-07-12  9:30       ` Lucas Stach
2021-07-13  9:12         ` Robin Gong
2021-07-13  9:30           ` Lucas Stach
2021-04-07 15:30 ` [PATCH v14 09/12] dmaengine: imx-sdma: remove ERR009165 " Robin Gong
2021-07-09  9:44   ` Lucas Stach
2021-07-12  4:03     ` Robin Gong
2021-07-12  9:33       ` Lucas Stach
2021-07-13  9:14         ` Robin Gong
2021-04-07 15:30 ` [PATCH v14 10/12] dma: imx-sdma: add i.mx6ul compatible name Robin Gong
2021-04-07 15:30 ` [PATCH v14 11/12] dmaengine: imx-sdma: add uart rom script Robin Gong
2021-07-09  9:55   ` Lucas Stach
2021-04-07 15:30 ` [PATCH v14 12/12] dmaengine: imx-sdma: add terminated list for freed descriptor in worker Robin Gong
2021-04-12  9:39   ` Vinod Koul
2021-04-13  5:05     ` Robin Gong
2021-06-15  6:06   ` Vinod Koul
2021-07-09  9:55   ` Lucas Stach
2021-06-11 13:51 ` [PATCH v14 00/12] add ecspi ERR009165 for i.mx6/7 soc family Fabio Estevam
2021-06-15  1:55   ` Robin Gong
2021-06-15  6:07     ` Vinod Koul
2021-06-15  6:36       ` Robin Gong
2021-06-15 12:07         ` Vinod Koul
2021-06-15 14:10           ` Robin Gong
2021-06-16 10:16             ` Vinod Koul
2021-06-16 10:44               ` Robin Gong
2021-06-15  2:12 ` Fabio Estevam
2021-06-15  2:17   ` Robin Gong

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