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Date: Mon, 23 Oct 2023 11:31:20 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Zhenhua Huang <quic_zhenhuah@...cinc.com>, agross@...nel.org,
andersson@...nel.org, konrad.dybcio@...aro.org, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, kernel@...cinc.com,
quic_tingweiz@...cinc.com
Subject: Re: [PATCH v1 3/5] soc: qcom: memory_dump: Add memory dump driver
On 23/10/2023 11:20, Zhenhua Huang wrote:
> Qualcomm memory dump driver initializes system memory dump table.
> Firmware dumps system cache, internal memory, peripheral registers
> to DDR as per this table after system crashes and warm resets. The
> driver reserves memory, populates ids and sizes for firmware dumping
> according to the configuration.
>
> Signed-off-by: Zhenhua Huang <quic_zhenhuah@...cinc.com>
> ---
...
> +
> +/* populate allocated region */
> +static int __init mem_dump_populate_mem(struct device *dev,
> + struct page *start_page,
> + size_t total_size)
> +{
> + struct qcom_memory_dump *memdump = dev_get_drvdata(dev);
> + struct qcom_dump_entry dump_entry;
> + struct qcom_dump_data *dump_data;
> + struct xbc_node *linked_list;
> + phys_addr_t phys_end_addr;
> + phys_addr_t phys_addr;
> + const char *size_p;
> + void *dump_vaddr;
> + const char *id_p;
> + int ret = 0;
> + int size;
> + int id;
> +
> + phys_addr = page_to_phys(start_page);
> + phys_end_addr = phys_addr + total_size;
> + dump_vaddr = page_to_virt(start_page);
> +
> + ret = mem_dump_register_data_table(dev, dump_vaddr, phys_addr);
> + if (ret) {
> + dev_err_probe(dev, ret, "Mem Dump table set up is failed\n");
> + return ret;
That's not the syntax. Syntax is return dev_err_probe
> + }
> +
> + ret = qcom_init_memdump_imem_area(dev, total_size);
> + if (ret)
> + return ret;
> +
> + /* Apply two tables: QCOM_DUMP_TYPE_TABLE and QCOM_DUMP_TYPE_DATA */
> + mem_dump_apply_offset(&dump_vaddr, &phys_addr,
> + sizeof(struct qcom_dump_table) * 2);
> +
> + /* Both "id" and "size" must be present */
> + xbc_node_for_each_subkey(memdump->mem_dump_node, linked_list) {
> + const char *name = xbc_node_get_data(linked_list);
> +
> + if (!name)
> + continue;
> +
> + id_p = xbc_node_find_value(linked_list, "id", NULL);
> + size_p = xbc_node_find_value(linked_list, "size", NULL);
> +
> + if (id_p && size_p) {
> + ret = kstrtoint(id_p, 0, &id);
> + if (ret)
> + continue;
> +
> + ret = kstrtoint(size_p, 0, &size);
> +
> + if (ret)
> + continue;
> +
> + /*
> + * Physical layout: starting from two qcom_dump_data.
> + * Following are respective dump meta data and reserved regions.
> + * Qcom_dump_data is populated by the driver, fw parse it
> + * and dump respective info into dump mem.
> + * Illustrate the layout:
> + *
> + * +------------------------+------------------------+
> + * | qcom_dump_table(TABLE) | qcom_dump_table(DATA) |
> + * +------------------------+------------------------+
> + * +-------------+----------+-------------+----------+
> + * |qcom_dump_data| dump mem|qcom_dump_data| dump mem |
> + * +-------------+----------+-------------+----------+
> + * +-------------+----------+-------------+----------+
> + * |qcom_dump_data| dump mem|qcom_dump_data| dump mem |
> + * +-------------+----------+-------------+----------+
> + * ...
> + */
You have wrong indentation here.
> + dump_data = dump_vaddr;
> + dump_data->addr = phys_addr + QCOM_DUMP_DATA_SIZE;
> + dump_data->len = size;
> + dump_entry.id = id;
> + strscpy(dump_data->name, name,
> + sizeof(dump_data->name));
> + dump_entry.addr = phys_addr;
> + ret = mem_dump_data_register(dev, QCOM_DUMP_TABLE_LINUX,
> + &dump_entry);
> + if (ret) {
> + dev_err_probe(dev, ret, "Dump data setup failed, id = %d\n",
> + id);
Syntax is return dev_err_probe
> + return ret;
> + }
> +
> + mem_dump_apply_offset(&dump_vaddr, &phys_addr,
> + size + QCOM_DUMP_DATA_SIZE);
> + if (phys_addr > phys_end_addr) {
> + dev_err_probe(dev, -ENOMEM, "Exceeding allocated region\n");
ENOMEM? Does not look right then.
> + return -ENOMEM;
> + }
> + } else {
> + continue;
> + }
> + }
> +
> + return ret;
> +}
> +
> +static int __init mem_dump_probe(struct platform_device *pdev)
> +{
> + struct qcom_memory_dump *memdump;
> + struct device *dev = &pdev->dev;
> + struct page *page;
> + size_t total_size;
> + int ret = 0;
> +
> + memdump = devm_kzalloc(dev, sizeof(struct qcom_memory_dump),
> + GFP_KERNEL);
> + if (!memdump)
> + return -ENOMEM;
> +
> + dev_set_drvdata(dev, memdump);
> +
> + /* check and initiate CMA region */
> + ret = mem_dump_reserve_mem(dev);
> + if (ret)
> + return ret;
> +
> + /* allocate and populate */
> + page = mem_dump_alloc_mem(dev, &total_size);
> + if (IS_ERR(page)) {
> + ret = PTR_ERR(page);
> + dev_err_probe(dev, ret, "mem dump alloc failed\n");
No, the syntax is:
ret = dev_err_probe
But why do you print messgaes for memory allocations?
> + goto release;
> + }
> +
> + ret = mem_dump_populate_mem(dev, page, total_size);
> + if (!ret)
> + dev_info(dev, "Mem dump region populated successfully\n");
Drop simple probe success messages. Not needed.
> + else
> + goto free;
> +
> + return 0;
> +
> +free:
> + cma_release(dev_get_cma_area(dev), page, (total_size / PAGE_SIZE));
> +
> +release:
> + of_reserved_mem_device_release(dev);
Where is cleanup on unbind?
> + return ret;
> +}
> +
> +static const struct of_device_id mem_dump_match_table[] = {
> + {.compatible = "qcom,mem-dump",},
> + {}
> +};
> +
Best regards,
Krzysztof
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