linux-kernel - Re: [PATCH 2/2] remoteproc: qcom: add hexagon based WCSS secure PIL driver

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Message-ID: <4y37wrg7gi3unpqw5ukgd6jrwuqmuofcabhmtwzlgfpgtiighw@74abrhmpzktv>
Date: Tue, 20 Aug 2024 13:25:04 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Gokul Sriram Palanisamy <quic_gokulsri@...cinc.com>
Cc: andersson@...nel.org, krzk+dt@...nel.org, 
	linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, quic_viswanat@...cinc.com, quic_mmanikan@...cinc.com, 
	quic_varada@...cinc.com, quic_srichara@...cinc.com
Subject: Re: [PATCH 2/2] remoteproc: qcom: add hexagon based WCSS secure PIL
 driver

On Tue, Aug 20, 2024 at 02:25:15PM +0530, Gokul Sriram Palanisamy wrote:
> From: Vignesh Viswanathan <quic_viswanat@...cinc.com>
> 
> Add support to bring up hexagon based WCSS secure PIL remoteproc.
> IPQ5332, IPQ9574 supports secure PIL remoteproc.
> 
> Signed-off-by: Vignesh Viswanathan <quic_viswanat@...cinc.com>
> Signed-off-by: Manikanta Mylavarapu <quic_mmanikan@...cinc.com>
> Signed-off-by: Gokul Sriram Palanisamy <quic_gokulsri@...cinc.com>
> +static int wcss_sec_dump_segments(struct rproc *rproc,
> +				  const struct firmware *fw)
> +{
> +	struct device *dev = rproc->dev.parent;
> +	struct reserved_mem *rmem = NULL;
> +	struct device_node *node;
> +	int num_segs, index = 0;
> +	int ret;
> +
> +	/* Parse through additional reserved memory regions for the rproc
> +	 * and add them to the coredump segments
> +	 */
> +	num_segs = of_count_phandle_with_args(dev->of_node,
> +					      "memory-region", NULL);
> +	while (index < num_segs) {
> +		node = of_parse_phandle(dev->of_node,
> +					"memory-region", index);
> +		if (!node)
> +			return -EINVAL;
> +
> +		rmem = of_reserved_mem_lookup(node);
> +		if (!rmem) {
> +			dev_err(dev, "unable to acquire memory-region index %d num_segs %d\n",
> +				index, num_segs);

Leaking refcnt.

> +			return -EINVAL;
> +		}
> +
> +		of_node_put(node);
> +
> +		dev_dbg(dev, "Adding segment 0x%pa size 0x%pa",
> +			&rmem->base, &rmem->size);
> +		ret = rproc_coredump_add_custom_segment(rproc,
> +							rmem->base,
> +							rmem->size,
> +							wcss_sec_copy_segment,
> +							NULL);
> +		if (ret)
> +			return ret;
> +
> +		index++;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct rproc_ops wcss_sec_ops = {
> +	.start = wcss_sec_start,
> +	.stop = wcss_sec_stop,
> +	.da_to_va = wcss_sec_da_to_va,
> +	.load = wcss_sec_load,
> +	.get_boot_addr = rproc_elf_get_boot_addr,
> +	.panic = wcss_sec_panic,
> +	.parse_fw = wcss_sec_dump_segments,
> +};
> +
> +static int wcss_sec_alloc_memory_region(struct wcss_sec *wcss)
> +{
> +	struct reserved_mem *rmem = NULL;
> +	struct device_node *node;
> +	struct device *dev = wcss->dev;
> +
> +	node = of_parse_phandle(dev->of_node, "memory-region", 0);
> +	if (node) {
> +		rmem = of_reserved_mem_lookup(node);
> +	} else {

No, that's over complicated.

Just if (!node) { error handling }.

> +		dev_err(dev, "can't find phandle memory-region\n");
> +		return -EINVAL;
> +	}
> +
> +	of_node_put(node);
> +
> +	if (!rmem) {
> +		dev_err(dev, "unable to acquire memory-region\n");
> +		return -EINVAL;
> +	}
> +
> +	wcss->mem_phys = rmem->base;
> +	wcss->mem_reloc = rmem->base;
> +	wcss->mem_size = rmem->size;
> +	wcss->mem_region = devm_ioremap_wc(dev, wcss->mem_phys, wcss->mem_size);
> +	if (!wcss->mem_region) {
> +		dev_err(dev, "unable to map memory region: %pa+%pa\n",
> +			&rmem->base, &rmem->size);
> +		return -ENOMEM;
> +	}
> +
> +	return 0;
> +}
> +

...

> +static int wcss_sec_ipq5332_init_clk(struct wcss_sec *wcss)
> +{
> +	int ret;
> +	struct device *dev = wcss->dev;
> +
> +	wcss->im_sleep = devm_clk_get(wcss->dev, "im_sleep");
> +	if (IS_ERR(wcss->im_sleep)) {
> +		ret = PTR_ERR(wcss->im_sleep);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(dev, "failed to get im_sleep clock");

Syntax is return dev_err_probe.

> +		return ret;
> +	}
> +
> +	ret = clk_prepare_enable(wcss->im_sleep);
> +	if (ret) {
> +		dev_err(dev, "could not enable im_sleep clk\n");
> +		return ret;

Just use devm_clk_get_enabled.

> +	}
> +
> +	return 0;

Best regards,
Krzysztof