Re: [PATCH v11 4/4] remoteproc: zynqmp: parse TCM from device tree

[Tanmay Shah <tanmay.shah@amd.com>]

On 2/28/24 11:06 AM, Mathieu Poirier wrote:
> On Mon, Feb 19, 2024 at 09:44:37AM -0800, Tanmay Shah wrote:
> > ZynqMP TCM information was fixed in driver. Now ZynqMP TCM information
> > is available in device-tree. Parse TCM information in driver
> > as per new bindings.
> > 
> > Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
> > ---
> > 
> > Changes in v11:
> >   - Remove redundant initialization of the variable
> >   - return correct error code if memory allocation failed
>
> Where is that?  I looked really hard but couldn't find it.

Hi Mathieu,

Thanks for reviews. Please find my comment below.

>
> > 
> >  drivers/remoteproc/xlnx_r5_remoteproc.c | 112 ++++++++++++++++++++++--
> >  1 file changed, 107 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/remoteproc/xlnx_r5_remoteproc.c b/drivers/remoteproc/xlnx_r5_remoteproc.c
> > index 42b0384d34f2..d4a22caebaad 100644
> > --- a/drivers/remoteproc/xlnx_r5_remoteproc.c
> > +++ b/drivers/remoteproc/xlnx_r5_remoteproc.c
> > @@ -74,8 +74,8 @@ struct mbox_info {
> >  };
> >  
> >  /*
> > - * Hardcoded TCM bank values. This will be removed once TCM bindings are
> > - * accepted for system-dt specifications and upstreamed in linux kernel
> > + * Hardcoded TCM bank values. This will stay in driver to maintain backward
> > + * compatibility with device-tree that does not have TCM information.
> >   */
> >  static const struct mem_bank_data zynqmp_tcm_banks_split[] = {
> >  	{0xffe00000UL, 0x0, 0x10000UL, PD_R5_0_ATCM, "atcm0"}, /* TCM 64KB each */
> > @@ -757,6 +757,103 @@ static struct zynqmp_r5_core *zynqmp_r5_add_rproc_core(struct device *cdev)
> >  	return ERR_PTR(ret);
> >  }
> >  
> > +static int zynqmp_r5_get_tcm_node_from_dt(struct zynqmp_r5_cluster *cluster)
> > +{
> > +	int i, j, tcm_bank_count, ret, tcm_pd_idx, pd_count;
> > +	struct of_phandle_args out_args;
> > +	struct zynqmp_r5_core *r5_core;
> > +	struct platform_device *cpdev;
> > +	struct mem_bank_data *tcm;
> > +	struct device_node *np;
> > +	struct resource *res;
> > +	u64 abs_addr, size;
> > +	struct device *dev;
> > +
> > +	for (i = 0; i < cluster->core_count; i++) {
> > +		r5_core = cluster->r5_cores[i];
> > +		dev = r5_core->dev;
> > +		np = r5_core->np;
> > +
> > +		pd_count = of_count_phandle_with_args(np, "power-domains",
> > +						      "#power-domain-cells");
> > +
> > +		if (pd_count <= 0) {
> > +			dev_err(dev, "invalid power-domains property, %d\n", pd_count);
> > +			return -EINVAL;
> > +		}
> > +
> > +		/* First entry in power-domains list is for r5 core, rest for TCM. */
> > +		tcm_bank_count = pd_count - 1;
> > +
> > +		if (tcm_bank_count <= 0) {
> > +			dev_err(dev, "invalid TCM count %d\n", tcm_bank_count);
> > +			return -EINVAL;
> > +		}
> > +
> > +		r5_core->tcm_banks = devm_kcalloc(dev, tcm_bank_count,
> > +						  sizeof(struct mem_bank_data *),
> > +						  GFP_KERNEL);
> > +		if (!r5_core->tcm_banks)
> > +			return -ENOMEM;

Hi Mathiue,

Here: in v10 it was following:

+		if (!r5_core->tcm_banks)
+			ret = -ENOMEM;

Which is not correct. Somehow I missed to return the error code instead it was just storing the error in variable.


> > +
> > +		r5_core->tcm_bank_count = tcm_bank_count;
> > +		for (j = 0, tcm_pd_idx = 1; j < tcm_bank_count; j++, tcm_pd_idx++) {
> > +			tcm = devm_kzalloc(dev, sizeof(struct mem_bank_data),
> > +					   GFP_KERNEL);
> > +			if (!tcm)
> > +				return -ENOMEM;
> > +
> > +			r5_core->tcm_banks[j] = tcm;
> > +
> > +			/* Get power-domains id of TCM. */
> > +			ret = of_parse_phandle_with_args(np, "power-domains",
> > +							 "#power-domain-cells",
> > +							 tcm_pd_idx, &out_args);
> > +			if (ret) {
> > +				dev_err(r5_core->dev,
> > +					"failed to get tcm %d pm domain, ret %d\n",
> > +					tcm_pd_idx, ret);
> > +				return ret;
> > +			}
> > +			tcm->pm_domain_id = out_args.args[0];
> > +			of_node_put(out_args.np);
> > +
> > +			/* Get TCM address without translation. */
> > +			ret = of_property_read_reg(np, j, &abs_addr, &size);
> > +			if (ret) {
> > +				dev_err(dev, "failed to get reg property\n");
> > +				return ret;
> > +			}
> > +
> > +			/*
> > +			 * Remote processor can address only 32 bits
> > +			 * so convert 64-bits into 32-bits. This will discard
> > +			 * any unwanted upper 32-bits.
> > +			 */
> > +			tcm->da = (u32)abs_addr;
> > +			tcm->size = (u32)size;
> > +
> > +			cpdev = to_platform_device(dev);
> > +			res = platform_get_resource(cpdev, IORESOURCE_MEM, j);
> > +			if (!res) {
> > +				dev_err(dev, "failed to get tcm resource\n");
> > +				return -EINVAL;
> > +			}
> > +
> > +			tcm->addr = (u32)res->start;
> > +			tcm->bank_name = (char *)res->name;
> > +			res = devm_request_mem_region(dev, tcm->addr, tcm->size,
> > +						      tcm->bank_name);
> > +			if (!res) {
> > +				dev_err(dev, "failed to request tcm resource\n");
> > +				return -EINVAL;
> > +			}
> > +		}
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> >  /**
> >   * zynqmp_r5_get_tcm_node()
> >   * Ideally this function should parse tcm node and store information
> > @@ -835,9 +932,14 @@ static int zynqmp_r5_core_init(struct zynqmp_r5_cluster *cluster,
> >  	struct zynqmp_r5_core *r5_core;
> >  	int ret, i;
> >  
> > -	ret = zynqmp_r5_get_tcm_node(cluster);
> > -	if (ret < 0) {
> > -		dev_err(dev, "can't get tcm node, err %d\n", ret);
> > +	r5_core = cluster->r5_cores[0];
> > +	if (of_find_property(r5_core->np, "reg", NULL))
> > +		ret = zynqmp_r5_get_tcm_node_from_dt(cluster);
> > +	else
> > +		ret = zynqmp_r5_get_tcm_node(cluster);
> > +
> > +	if (ret) {
> > +		dev_err(dev, "can't get tcm, err %d\n", ret);
> >  		return ret;
> >  	}
> >  
> > -- 
> > 2.25.1
> >