diff mbox series

[v14,05/12] dmaengine: dma: imx-sdma: add fw_loaded and is_ram_script

Message ID 1617809456-17693-6-git-send-email-yibin.gong@nxp.com (mailing list archive)
State New, archived
Headers show
Series add ecspi ERR009165 for i.mx6/7 soc family | expand

Commit Message

Robin Gong April 7, 2021, 3:30 p.m. UTC 
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(+)

Comments

Lucas Stach July 9, 2021, 9:24 a.m. UTC | #1 
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.

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);
Robin Gong July 12, 2021, 3:20 a.m. UTC | #2 
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);
>
diff mbox series

Patch

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;
+
 	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);