diff mbox series

[07/11] dmaengine: qcom-adm: stop abusing slave_id config

Message ID 20211115085403.360194-8-arnd@kernel.org (mailing list archive)
State Superseded
Headers show
Series dmaengine: kill off dma_slave_config->slave_id | expand

Commit Message

Arnd Bergmann Nov. 15, 2021, 8:53 a.m. UTC 
From: Arnd Bergmann <arnd@arndb.de>

The slave_id was previously used to pick one DMA slave instead of another,
but this is now done through the DMA descriptors in device tree.

For the qcom_adm driver, the configuration is documented in the DT
binding to contain a tuple of device identifier and a "crci" field,
but the implementation ends up using only a single cell for identifying
the slave, with the crci getting passed in nonstandard properties of
the device, and passed through the dma driver using the old slave_id
field. Part of the problem apparently is that the nand driver ends up
using only a single DMA request ID, but requires distinct values for
"crci" depending on the type of transfer.

Change both the dmaengine driver and the two slave drivers to allow
the documented binding to work in addition to the ad-hoc passing
of crci values. In order to no longer abuse the slave_id field, pass
the data using the "peripheral_config" mechanism instead.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/dma/qcom/qcom_adm.c       | 56 +++++++++++++++++++++++++++----
 drivers/mtd/nand/raw/qcom_nandc.c | 14 ++++++--
 drivers/tty/serial/msm_serial.c   | 15 +++++++--
 include/linux/dma/qcom_adm.h      | 12 +++++++
 4 files changed, 86 insertions(+), 11 deletions(-)
 create mode 100644 include/linux/dma/qcom_adm.h

Comments

kernel test robot Nov. 19, 2021, 12:42 p.m. UTC | #1 
Hi Arnd,

I love your patch! Perhaps something to improve:

[auto build test WARNING on vkoul-dmaengine/next]
[also build test WARNING on tiwai-sound/for-next staging/staging-testing linus/master v5.16-rc1 next-20211118]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Arnd-Bergmann/dmaengine-kill-off-dma_slave_config-slave_id/20211115-165731
base:   https://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git next
config: xtensa-buildonly-randconfig-r005-20211115 (attached as .config)
compiler: xtensa-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/f2e7f9ee67ce784864f75db39f20d1060c932279
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Arnd-Bergmann/dmaengine-kill-off-dma_slave_config-slave_id/20211115-165731
        git checkout f2e7f9ee67ce784864f75db39f20d1060c932279
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=xtensa 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/dma/qcom/qcom_adm.c:712:18: warning: no previous prototype for 'adm_dma_xlate' [-Wmissing-prototypes]
     712 | struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
         |                  ^~~~~~~~~~~~~


vim +/adm_dma_xlate +712 drivers/dma/qcom/qcom_adm.c

   700	
   701	/**
   702	 * adm_dma_xlate
   703	 * @dma_spec:	pointer to DMA specifier as found in the device tree
   704	 * @ofdma:	pointer to DMA controller data
   705	 *
   706	 * This can use either 1-cell or 2-cell formats, the first cell
   707	 * identifies the slave device, while the optional second cell
   708	 * contains the crci value.
   709	 *
   710	 * Returns pointer to appropriate dma channel on success or NULL on error.
   711	 */
 > 712	struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
   713				       struct of_dma *ofdma)
   714	{
   715		struct dma_device *dev = ofdma->of_dma_data;
   716		struct dma_chan *chan, *candidate = NULL;
   717		struct adm_chan *achan;
   718	
   719		if (!dev || dma_spec->args_count > 2)
   720			return NULL;
   721	
   722		list_for_each_entry(chan, &dev->channels, device_node)
   723			if (chan->chan_id == dma_spec->args[0]) {
   724				candidate = chan;
   725				break;
   726			}
   727	
   728		if (!candidate)
   729			return NULL;
   730	
   731		achan = to_adm_chan(candidate);
   732		if (dma_spec->args_count == 2)
   733			achan->crci = dma_spec->args[1];
   734		else
   735			achan->crci = 0;
   736	
   737		return dma_get_slave_channel(candidate);
   738	}
   739	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
kernel test robot Nov. 25, 2021, 7:57 a.m. UTC | #2 
Hi Arnd,

I love your patch! Perhaps something to improve:

[auto build test WARNING on vkoul-dmaengine/next]
[also build test WARNING on tiwai-sound/for-next staging/staging-testing linus/master v5.16-rc2 next-20211125]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Arnd-Bergmann/dmaengine-kill-off-dma_slave_config-slave_id/20211115-165731
base:   https://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git next
config: riscv-randconfig-r016-20211115 (https://download.01.org/0day-ci/archive/20211125/202111251538.x6sJNCka-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project fbe72e41b99dc7994daac300d208a955be3e4a0a)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/0day-ci/linux/commit/f2e7f9ee67ce784864f75db39f20d1060c932279
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Arnd-Bergmann/dmaengine-kill-off-dma_slave_config-slave_id/20211115-165731
        git checkout f2e7f9ee67ce784864f75db39f20d1060c932279
        # save the config file to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/dma/qcom/qcom_adm.c:712:18: warning: no previous prototype for function 'adm_dma_xlate' [-Wmissing-prototypes]
   struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
                    ^
   drivers/dma/qcom/qcom_adm.c:712:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
   ^
   static 
   1 warning generated.


vim +/adm_dma_xlate +712 drivers/dma/qcom/qcom_adm.c

   700	
   701	/**
   702	 * adm_dma_xlate
   703	 * @dma_spec:	pointer to DMA specifier as found in the device tree
   704	 * @ofdma:	pointer to DMA controller data
   705	 *
   706	 * This can use either 1-cell or 2-cell formats, the first cell
   707	 * identifies the slave device, while the optional second cell
   708	 * contains the crci value.
   709	 *
   710	 * Returns pointer to appropriate dma channel on success or NULL on error.
   711	 */
 > 712	struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
   713				       struct of_dma *ofdma)
   714	{
   715		struct dma_device *dev = ofdma->of_dma_data;
   716		struct dma_chan *chan, *candidate = NULL;
   717		struct adm_chan *achan;
   718	
   719		if (!dev || dma_spec->args_count > 2)
   720			return NULL;
   721	
   722		list_for_each_entry(chan, &dev->channels, device_node)
   723			if (chan->chan_id == dma_spec->args[0]) {
   724				candidate = chan;
   725				break;
   726			}
   727	
   728		if (!candidate)
   729			return NULL;
   730	
   731		achan = to_adm_chan(candidate);
   732		if (dma_spec->args_count == 2)
   733			achan->crci = dma_spec->args[1];
   734		else
   735			achan->crci = 0;
   736	
   737		return dma_get_slave_channel(candidate);
   738	}
   739	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
Arnd Bergmann Nov. 25, 2021, 8:25 a.m. UTC | #3 
On Thu, Nov 25, 2021 at 8:57 AM kernel test robot <lkp@intel.com> wrote:
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
>
> All warnings (new ones prefixed by >>):
>
> >> drivers/dma/qcom/qcom_adm.c:712:18: warning: no previous prototype for function 'adm_dma_xlate' [-Wmissing-prototypes]
>    struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
>                     ^
>    drivers/dma/qcom/qcom_adm.c:712:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
>    struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
>    ^
>    static
>    1 warning generated.

I noticed this mistake slipped into v2 as well, the function needs to
be marked 'static'.

Vinod, let me know how you want me to address this. Should I just fold
the fix (see below)
and the final Acks into the patch and send an updated pull request, or
do a complete v3
submission?

      Arnd

8<---
diff --git a/drivers/dma/qcom/qcom_adm.c b/drivers/dma/qcom/qcom_adm.c
index bb338b303af6..65697bee4db0 100644
--- a/drivers/dma/qcom/qcom_adm.c
+++ b/drivers/dma/qcom/qcom_adm.c
@@ -709,8 +709,8 @@ static void adm_channel_init(struct adm_device
*adev, struct adm_chan *achan,
  *
  * Returns pointer to appropriate dma channel on success or NULL on error.
  */
-struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
-                              struct of_dma *ofdma)
+static struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
+                                     struct of_dma *ofdma)
 {
        struct dma_device *dev = ofdma->of_dma_data;
        struct dma_chan *chan, *candidate = NULL;
Vinod Koul Nov. 25, 2021, 9:32 a.m. UTC | #4 
On 25-11-21, 09:25, Arnd Bergmann wrote:
> On Thu, Nov 25, 2021 at 8:57 AM kernel test robot <lkp@intel.com> wrote:
> >
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@intel.com>
> >
> > All warnings (new ones prefixed by >>):
> >
> > >> drivers/dma/qcom/qcom_adm.c:712:18: warning: no previous prototype for function 'adm_dma_xlate' [-Wmissing-prototypes]
> >    struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
> >                     ^
> >    drivers/dma/qcom/qcom_adm.c:712:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> >    struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
> >    ^
> >    static
> >    1 warning generated.
> 
> I noticed this mistake slipped into v2 as well, the function needs to
> be marked 'static'.
> 
> Vinod, let me know how you want me to address this. Should I just fold
> the fix (see below)
> and the final Acks into the patch and send an updated pull request, or
> do a complete v3
> submission?

I can fold this while applying, the series lgtm, I will wait a day
before applying...

Thanks

> 
>       Arnd
> 
> 8<---
> diff --git a/drivers/dma/qcom/qcom_adm.c b/drivers/dma/qcom/qcom_adm.c
> index bb338b303af6..65697bee4db0 100644
> --- a/drivers/dma/qcom/qcom_adm.c
> +++ b/drivers/dma/qcom/qcom_adm.c
> @@ -709,8 +709,8 @@ static void adm_channel_init(struct adm_device
> *adev, struct adm_chan *achan,
>   *
>   * Returns pointer to appropriate dma channel on success or NULL on error.
>   */
> -struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
> -                              struct of_dma *ofdma)
> +static struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
> +                                     struct of_dma *ofdma)
>  {
>         struct dma_device *dev = ofdma->of_dma_data;
>         struct dma_chan *chan, *candidate = NULL;
diff mbox series

Patch

diff --git a/drivers/dma/qcom/qcom_adm.c b/drivers/dma/qcom/qcom_adm.c
index ee78bed8d60d..bb338b303af6 100644
--- a/drivers/dma/qcom/qcom_adm.c
+++ b/drivers/dma/qcom/qcom_adm.c
@@ -8,6 +8,7 @@ 
 #include <linux/device.h>
 #include <linux/dmaengine.h>
 #include <linux/dma-mapping.h>
+#include <linux/dma/qcom_adm.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
@@ -140,6 +141,8 @@  struct adm_chan {
 
 	struct adm_async_desc *curr_txd;
 	struct dma_slave_config slave;
+	u32 crci;
+	u32 mux;
 	struct list_head node;
 
 	int error;
@@ -379,8 +382,8 @@  static struct dma_async_tx_descriptor *adm_prep_slave_sg(struct dma_chan *chan,
 			return ERR_PTR(-EINVAL);
 		}
 
-		crci = achan->slave.slave_id & 0xf;
-		if (!crci || achan->slave.slave_id > 0x1f) {
+		crci = achan->crci & 0xf;
+		if (!crci || achan->crci > 0x1f) {
 			dev_err(adev->dev, "invalid crci value\n");
 			return ERR_PTR(-EINVAL);
 		}
@@ -403,9 +406,7 @@  static struct dma_async_tx_descriptor *adm_prep_slave_sg(struct dma_chan *chan,
 	if (!async_desc)
 		return ERR_PTR(-ENOMEM);
 
-	if (crci)
-		async_desc->mux = achan->slave.slave_id & ADM_CRCI_MUX_SEL ?
-					ADM_CRCI_CTL_MUX_SEL : 0;
+	async_desc->mux = achan->mux ? ADM_CRCI_CTL_MUX_SEL : 0;
 	async_desc->crci = crci;
 	async_desc->blk_size = blk_size;
 	async_desc->dma_len = single_count * sizeof(struct adm_desc_hw_single) +
@@ -488,10 +489,13 @@  static int adm_terminate_all(struct dma_chan *chan)
 static int adm_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg)
 {
 	struct adm_chan *achan = to_adm_chan(chan);
+	struct qcom_adm_peripheral_config *config = cfg->peripheral_config;
 	unsigned long flag;
 
 	spin_lock_irqsave(&achan->vc.lock, flag);
 	memcpy(&achan->slave, cfg, sizeof(struct dma_slave_config));
+	if (cfg->peripheral_size == sizeof(config))
+		achan->crci = config->crci;
 	spin_unlock_irqrestore(&achan->vc.lock, flag);
 
 	return 0;
@@ -694,6 +698,45 @@  static void adm_channel_init(struct adm_device *adev, struct adm_chan *achan,
 	achan->vc.desc_free = adm_dma_free_desc;
 }
 
+/**
+ * adm_dma_xlate
+ * @dma_spec:	pointer to DMA specifier as found in the device tree
+ * @ofdma:	pointer to DMA controller data
+ *
+ * This can use either 1-cell or 2-cell formats, the first cell
+ * identifies the slave device, while the optional second cell
+ * contains the crci value.
+ *
+ * Returns pointer to appropriate dma channel on success or NULL on error.
+ */
+struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
+			       struct of_dma *ofdma)
+{
+	struct dma_device *dev = ofdma->of_dma_data;
+	struct dma_chan *chan, *candidate = NULL;
+	struct adm_chan *achan;
+
+	if (!dev || dma_spec->args_count > 2)
+		return NULL;
+
+	list_for_each_entry(chan, &dev->channels, device_node)
+		if (chan->chan_id == dma_spec->args[0]) {
+			candidate = chan;
+			break;
+		}
+
+	if (!candidate)
+		return NULL;
+
+	achan = to_adm_chan(candidate);
+	if (dma_spec->args_count == 2)
+		achan->crci = dma_spec->args[1];
+	else
+		achan->crci = 0;
+
+	return dma_get_slave_channel(candidate);
+}
+
 static int adm_dma_probe(struct platform_device *pdev)
 {
 	struct adm_device *adev;
@@ -838,8 +881,7 @@  static int adm_dma_probe(struct platform_device *pdev)
 		goto err_disable_clks;
 	}
 
-	ret = of_dma_controller_register(pdev->dev.of_node,
-					 of_dma_xlate_by_chan_id,
+	ret = of_dma_controller_register(pdev->dev.of_node, adm_dma_xlate,
 					 &adev->common);
 	if (ret)
 		goto err_unregister_dma;
diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index 04e6f7b26706..7c6efa3b6255 100644
--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -6,6 +6,7 @@ 
 #include <linux/clk.h>
 #include <linux/slab.h>
 #include <linux/bitops.h>
+#include <linux/dma/qcom_adm.h>
 #include <linux/dma-mapping.h>
 #include <linux/dmaengine.h>
 #include <linux/module.h>
@@ -952,6 +953,7 @@  static int prep_adm_dma_desc(struct qcom_nand_controller *nandc, bool read,
 	struct dma_async_tx_descriptor *dma_desc;
 	struct scatterlist *sgl;
 	struct dma_slave_config slave_conf;
+	struct qcom_adm_peripheral_config periph_conf = {};
 	enum dma_transfer_direction dir_eng;
 	int ret;
 
@@ -983,11 +985,19 @@  static int prep_adm_dma_desc(struct qcom_nand_controller *nandc, bool read,
 	if (read) {
 		slave_conf.src_maxburst = 16;
 		slave_conf.src_addr = nandc->base_dma + reg_off;
-		slave_conf.slave_id = nandc->data_crci;
+		if (nandc->data_crci) {
+			periph_conf.crci = nandc->data_crci;
+			slave_conf.peripheral_config = &periph_conf;
+			slave_conf.peripheral_size = sizeof(periph_conf);
+		}
 	} else {
 		slave_conf.dst_maxburst = 16;
 		slave_conf.dst_addr = nandc->base_dma + reg_off;
-		slave_conf.slave_id = nandc->cmd_crci;
+		if (nandc->cmd_crci) {
+			periph_conf.crci = nandc->cmd_crci;
+			slave_conf.peripheral_config = &periph_conf;
+			slave_conf.peripheral_size = sizeof(periph_conf);
+		}
 	}
 
 	ret = dmaengine_slave_config(nandc->chan, &slave_conf);
diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index fcef7a961430..c6be09f44dc1 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -9,6 +9,7 @@ 
 
 #include <linux/kernel.h>
 #include <linux/atomic.h>
+#include <linux/dma/qcom_adm.h>
 #include <linux/dma-mapping.h>
 #include <linux/dmaengine.h>
 #include <linux/module.h>
@@ -290,6 +291,7 @@  static void msm_request_tx_dma(struct msm_port *msm_port, resource_size_t base)
 {
 	struct device *dev = msm_port->uart.dev;
 	struct dma_slave_config conf;
+	struct qcom_adm_peripheral_config periph_conf = {};
 	struct msm_dma *dma;
 	u32 crci = 0;
 	int ret;
@@ -308,7 +310,11 @@  static void msm_request_tx_dma(struct msm_port *msm_port, resource_size_t base)
 	conf.device_fc = true;
 	conf.dst_addr = base + UARTDM_TF;
 	conf.dst_maxburst = UARTDM_BURST_SIZE;
-	conf.slave_id = crci;
+	if (crci) {
+		conf.peripheral_config = &periph_conf;
+		conf.peripheral_size = sizeof(periph_conf);
+		periph_conf.crci = crci;
+	}
 
 	ret = dmaengine_slave_config(dma->chan, &conf);
 	if (ret)
@@ -333,6 +339,7 @@  static void msm_request_rx_dma(struct msm_port *msm_port, resource_size_t base)
 {
 	struct device *dev = msm_port->uart.dev;
 	struct dma_slave_config conf;
+	struct qcom_adm_peripheral_config periph_conf = {};
 	struct msm_dma *dma;
 	u32 crci = 0;
 	int ret;
@@ -355,7 +362,11 @@  static void msm_request_rx_dma(struct msm_port *msm_port, resource_size_t base)
 	conf.device_fc = true;
 	conf.src_addr = base + UARTDM_RF;
 	conf.src_maxburst = UARTDM_BURST_SIZE;
-	conf.slave_id = crci;
+	if (crci) {
+		conf.peripheral_config = &periph_conf;
+		conf.peripheral_size = sizeof(periph_conf);
+		periph_conf.crci = crci;
+	}
 
 	ret = dmaengine_slave_config(dma->chan, &conf);
 	if (ret)
diff --git a/include/linux/dma/qcom_adm.h b/include/linux/dma/qcom_adm.h
new file mode 100644
index 000000000000..af20df674f0c
--- /dev/null
+++ b/include/linux/dma/qcom_adm.h
@@ -0,0 +1,12 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+#ifndef __LINUX_DMA_QCOM_ADM_H
+#define __LINUX_DMA_QCOM_ADM_H
+
+#include <linux/types.h>
+
+struct qcom_adm_peripheral_config {
+	u32 crci;
+	u32 mux;
+};
+
+#endif /* __LINUX_DMA_QCOM_ADM_H */