Date:   Thu, 3 Sep 2020 10:38:32 +0000
From:   Shiju Jose <shiju.jose@...wei.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "helgaas@...nel.org" <helgaas@...nel.org>,
        "bp@...en8.de" <bp@...en8.de>,
        "james.morse@....com" <james.morse@....com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "robh@...nel.org" <robh@...nel.org>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "dan.carpenter@...cle.com" <dan.carpenter@...cle.com>,
        yangyicong <yangyicong@...wei.com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        tanxiaofei <tanxiaofei@...wei.com>,
        Linuxarm <linuxarm@...wei.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: RE: [RESEND PATCH v14 2/2] PCI: hip: Add handling of HiSilicon HIP
 PCIe controller errors

Hi Andy,

>-----Original Message-----
>From: Andy Shevchenko [mailto:andriy.shevchenko@...ux.intel.com]
>Sent: 01 September 2020 09:26
>To: Shiju Jose <shiju.jose@...wei.com>
>Cc: linux-acpi@...r.kernel.org; linux-pci@...r.kernel.org; linux-
>kernel@...r.kernel.org; rjw@...ysocki.net; helgaas@...nel.org;
>bp@...en8.de; james.morse@....com; lorenzo.pieralisi@....com;
>robh@...nel.org; lenb@...nel.org; tony.luck@...el.com;
>dan.carpenter@...cle.com; yangyicong <yangyicong@...wei.com>;
>Jonathan Cameron <jonathan.cameron@...wei.com>; tanxiaofei
><tanxiaofei@...wei.com>; Linuxarm <linuxarm@...wei.com>; Bjorn
>Helgaas <bhelgaas@...gle.com>
>Subject: Re: [RESEND PATCH v14 2/2] PCI: hip: Add handling of HiSilicon HIP
>PCIe controller errors
>
>On Mon, Aug 31, 2020 at 10:26:06PM +0100, Shiju Jose wrote:
>> From: Yicong Yang <yangyicong@...ilicon.com>
>>
>> The HiSilicon HIP PCIe controller is capable of handling errors on
>> root port and performing port reset separately at each root port.
>>
>> Add error handling driver for HIP PCIe controller to log and report
>> recoverable errors. Perform root port reset and restore link status
>> after the recovery.
>>
>> Following are some of the PCIe controller's recoverable errors 1.
>> completion transmission timeout error.
>> 2. CRS retry counter over the threshold error.
>> 3. ECC 2 bit errors
>> 4. AXI bresponse/rresponse errors etc.
>>
>> The driver placed in the drivers/pci/controller/ because the HIP PCIe
>> controller does not use DWC IP.
>>
>> Signed-off-by: Yicong Yang <yangyicong@...ilicon.com>
>> Signed-off-by: Shiju Jose <shiju.jose@...wei.com>
>> Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
>> --
>> drivers/pci/controller/Kconfig           |   8 +
>> drivers/pci/controller/Makefile          |   1 +
>> drivers/pci/controller/pcie-hisi-error.c | 336
>> +++++++++++++++++++++++++++++++
>> 3 files changed, 345 insertions(+)
>> create mode 100644 drivers/pci/controller/pcie-hisi-error.c
>> ---
>>  drivers/pci/controller/Kconfig           |   8 +
>>  drivers/pci/controller/Makefile          |   1 +
>>  drivers/pci/controller/pcie-hisi-error.c | 327
>> +++++++++++++++++++++++
>>  3 files changed, 336 insertions(+)
>>  create mode 100644 drivers/pci/controller/pcie-hisi-error.c
>>
>> diff --git a/drivers/pci/controller/Kconfig
>> b/drivers/pci/controller/Kconfig index f18c3725ef80..b1b8a8805dd8
>> 100644
>> --- a/drivers/pci/controller/Kconfig
>> +++ b/drivers/pci/controller/Kconfig
>> @@ -294,6 +294,14 @@ config PCI_LOONGSON
>>  	  Say Y here if you want to enable PCI controller support on
>>  	  Loongson systems.
>>
>> +config PCIE_HISI_ERR
>> +	depends on ACPI_APEI_GHES && (ARM64 || COMPILE_TEST)
>
>> +	depends on ACPI
>
>Isn't this implied by
>	drivers/acpi/Kconfig:45:if ACPI
>?

This can be removed as  ACPI_APEI_GHES depends on ACPI.

Do you have any other comments on this patch?

>
>> +	bool "HiSilicon HIP PCIe controller error handling driver"
>> +	help
>> +	  Say Y here if you want error handling support
>> +	  for the PCIe controller's errors on HiSilicon HIP SoCs
>> +
>>  source "drivers/pci/controller/dwc/Kconfig"
>>  source "drivers/pci/controller/mobiveil/Kconfig"
>>  source "drivers/pci/controller/cadence/Kconfig"
>> diff --git a/drivers/pci/controller/Makefile
>> b/drivers/pci/controller/Makefile index bcdbf49ab1e4..04c6edc285c5
>> 100644
>> --- a/drivers/pci/controller/Makefile
>> +++ b/drivers/pci/controller/Makefile
>> @@ -31,6 +31,7 @@ obj-$(CONFIG_PCIE_TANGO_SMP8759) += pcie-
>tango.o
>>  obj-$(CONFIG_VMD) += vmd.o
>>  obj-$(CONFIG_PCIE_BRCMSTB) += pcie-brcmstb.o
>>  obj-$(CONFIG_PCI_LOONGSON) += pci-loongson.o
>> +obj-$(CONFIG_PCIE_HISI_ERR) += pcie-hisi-error.o
>>  # pcie-hisi.o quirks are needed even without CONFIG_PCIE_DW
>>  obj-y				+= dwc/
>>  obj-y				+= mobiveil/
>> diff --git a/drivers/pci/controller/pcie-hisi-error.c
>> b/drivers/pci/controller/pcie-hisi-error.c
>> new file mode 100644
>> index 000000000000..7959c9c8d2bc
>> --- /dev/null
>> +++ b/drivers/pci/controller/pcie-hisi-error.c
>> @@ -0,0 +1,327 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Driver for handling the PCIe controller errors on
>> + * HiSilicon HIP SoCs.
>> + *
>> + * Copyright (c) 2020 HiSilicon Limited.
>> + */
>> +
>> +#include <linux/acpi.h>
>> +#include <acpi/ghes.h>
>> +#include <linux/bitops.h>
>> +#include <linux/delay.h>
>> +#include <linux/pci.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/kfifo.h>
>> +#include <linux/spinlock.h>
>> +
>> +/* HISI PCIe controller error definitions */
>> +#define HISI_PCIE_ERR_MISC_REGS	33
>> +
>> +#define HISI_PCIE_LOCAL_VALID_VERSION		BIT(0)
>> +#define HISI_PCIE_LOCAL_VALID_SOC_ID		BIT(1)
>> +#define HISI_PCIE_LOCAL_VALID_SOCKET_ID		BIT(2)
>> +#define HISI_PCIE_LOCAL_VALID_NIMBUS_ID		BIT(3)
>> +#define HISI_PCIE_LOCAL_VALID_SUB_MODULE_ID	BIT(4)
>> +#define HISI_PCIE_LOCAL_VALID_CORE_ID		BIT(5)
>> +#define HISI_PCIE_LOCAL_VALID_PORT_ID		BIT(6)
>> +#define HISI_PCIE_LOCAL_VALID_ERR_TYPE		BIT(7)
>> +#define HISI_PCIE_LOCAL_VALID_ERR_SEVERITY	BIT(8)
>> +#define HISI_PCIE_LOCAL_VALID_ERR_MISC		9
>> +
>> +static guid_t hisi_pcie_sec_guid =
>> +	GUID_INIT(0xB2889FC9, 0xE7D7, 0x4F9D,
>> +		  0xA8, 0x67, 0xAF, 0x42, 0xE9, 0x8B, 0xE7, 0x72);
>> +
>> +/*
>> + * Firmware reports the socket port ID where the error occurred.
>> +These
>> + * macros convert that to the core ID and core port ID required by
>> +the
>> + * ACPI reset method.
>> + */
>> +#define HISI_PCIE_PORT_ID(core, v)       (((v) >> 1) + ((core) << 3))
>> +#define HISI_PCIE_CORE_ID(v)             ((v) >> 3)
>> +#define HISI_PCIE_CORE_PORT_ID(v)        (((v) & 7) << 1)
>> +
>> +struct hisi_pcie_error_data {
>> +	u64	val_bits;
>> +	u8	version;
>> +	u8	soc_id;
>> +	u8	socket_id;
>> +	u8	nimbus_id;
>> +	u8	sub_module_id;
>> +	u8	core_id;
>> +	u8	port_id;
>> +	u8	err_severity;
>> +	u16	err_type;
>> +	u8	reserv[2];
>> +	u32	err_misc[HISI_PCIE_ERR_MISC_REGS];
>> +};
>> +
>> +struct hisi_pcie_error_private {
>> +	struct notifier_block	nb;
>> +	struct device *dev;
>> +};
>> +
>> +enum hisi_pcie_submodule_id {
>> +	HISI_PCIE_SUB_MODULE_ID_AP,
>> +	HISI_PCIE_SUB_MODULE_ID_TL,
>> +	HISI_PCIE_SUB_MODULE_ID_MAC,
>> +	HISI_PCIE_SUB_MODULE_ID_DL,
>> +	HISI_PCIE_SUB_MODULE_ID_SDI,
>> +};
>> +
>> +static const char * const hisi_pcie_sub_module[] = {
>> +	[HISI_PCIE_SUB_MODULE_ID_AP]	= "AP Layer",
>> +	[HISI_PCIE_SUB_MODULE_ID_TL]	= "TL Layer",
>> +	[HISI_PCIE_SUB_MODULE_ID_MAC]	= "MAC Layer",
>> +	[HISI_PCIE_SUB_MODULE_ID_DL]	= "DL Layer",
>> +	[HISI_PCIE_SUB_MODULE_ID_SDI]	= "SDI Layer",
>> +};
>> +
>> +enum hisi_pcie_err_severity {
>> +	HISI_PCIE_ERR_SEV_RECOVERABLE,
>> +	HISI_PCIE_ERR_SEV_FATAL,
>> +	HISI_PCIE_ERR_SEV_CORRECTED,
>> +	HISI_PCIE_ERR_SEV_NONE,
>> +};
>> +
>> +static const char * const hisi_pcie_error_sev[] = {
>> +	[HISI_PCIE_ERR_SEV_RECOVERABLE]	= "recoverable",
>> +	[HISI_PCIE_ERR_SEV_FATAL]	= "fatal",
>> +	[HISI_PCIE_ERR_SEV_CORRECTED]	= "corrected",
>> +	[HISI_PCIE_ERR_SEV_NONE]	= "none",
>> +};
>> +
>> +static const char *hisi_pcie_get_string(const char * const *array,
>> +					size_t n, u32 id)
>> +{
>> +	u32 index;
>> +
>> +	for (index = 0; index < n; index++) {
>> +		if (index == id && array[index])
>> +			return array[index];
>> +	}
>> +
>> +	return "unknown";
>> +}
>> +
>> +static int hisi_pcie_port_reset(struct platform_device *pdev,
>> +				u32 chip_id, u32 port_id)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	acpi_handle handle = ACPI_HANDLE(dev);
>> +	union acpi_object arg[3];
>> +	struct acpi_object_list arg_list;
>> +	acpi_status s;
>> +	unsigned long long data = 0;
>> +
>> +	arg[0].type = ACPI_TYPE_INTEGER;
>> +	arg[0].integer.value = chip_id;
>> +	arg[1].type = ACPI_TYPE_INTEGER;
>> +	arg[1].integer.value = HISI_PCIE_CORE_ID(port_id);
>> +	arg[2].type = ACPI_TYPE_INTEGER;
>> +	arg[2].integer.value = HISI_PCIE_CORE_PORT_ID(port_id);
>> +
>> +	arg_list.count = 3;
>> +	arg_list.pointer = arg;
>> +
>> +	s = acpi_evaluate_integer(handle, "RST", &arg_list, &data);
>> +	if (ACPI_FAILURE(s)) {
>> +		dev_err(dev, "No RST method\n");
>> +		return -EIO;
>> +	}
>> +
>> +	if (data) {
>> +		dev_err(dev, "Failed to Reset\n");
>> +		return -EIO;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int hisi_pcie_port_do_recovery(struct platform_device *dev,
>> +				      u32 chip_id, u32 port_id)
>> +{
>> +	acpi_status s;
>> +	struct device *device = &dev->dev;
>> +	acpi_handle root_handle = ACPI_HANDLE(device);
>> +	struct acpi_pci_root *pci_root;
>> +	struct pci_bus *root_bus;
>> +	struct pci_dev *pdev;
>> +	u32 domain, busnr, devfn;
>> +
>> +	s = acpi_get_parent(root_handle, &root_handle);
>> +	if (ACPI_FAILURE(s))
>> +		return -ENODEV;
>> +	pci_root = acpi_pci_find_root(root_handle);
>> +	if (!pci_root)
>> +		return -ENODEV;
>> +	root_bus = pci_root->bus;
>> +	domain = pci_root->segment;
>> +
>> +	busnr = root_bus->number;
>> +	devfn = PCI_DEVFN(port_id, 0);
>> +	pdev = pci_get_domain_bus_and_slot(domain, busnr, devfn);
>> +	if (!pdev) {
>> +		dev_info(device, "Fail to get root port %04x:%02x:%02x.%d
>device\n",
>> +			 domain, busnr, PCI_SLOT(devfn), PCI_FUNC(devfn));
>> +		return -ENODEV;
>> +	}
>> +
>> +	pci_stop_and_remove_bus_device_locked(pdev);
>> +	pci_dev_put(pdev);
>> +
>> +	if (hisi_pcie_port_reset(dev, chip_id, port_id))
>> +		return -EIO;
>> +
>> +	/*
>> +	 * The initialization time of subordinate devices after
>> +	 * hot reset is no more than 1s, which is required by
>> +	 * the PCI spec v5.0 sec 6.6.1. The time will shorten
>> +	 * if Readiness Notifications mechanisms are used. But
>> +	 * wait 1s here to adapt any conditions.
>> +	 */
>> +	ssleep(1UL);
>> +
>> +	/* add root port and downstream devices */
>> +	pci_lock_rescan_remove();
>> +	pci_rescan_bus(root_bus);
>> +	pci_unlock_rescan_remove();
>> +
>> +	return 0;
>> +}
>> +
>> +static void hisi_pcie_handle_error(struct platform_device *pdev,
>> +				   const struct hisi_pcie_error_data *edata) {
>> +	struct device *dev = &pdev->dev;
>> +	int idx, rc;
>> +	const unsigned long valid_bits[] =
>> +{BITMAP_FROM_U64(edata->val_bits)};
>> +
>> +	if (edata->val_bits == 0) {
>> +		dev_warn(dev, "%s: no valid error information\n", __func__);
>> +		return;
>> +	}
>> +
>> +	dev_info(dev, "\nHISI : HIP : PCIe controller error\n");
>> +	if (edata->val_bits & HISI_PCIE_LOCAL_VALID_SOC_ID)
>> +		dev_info(dev, "Table version = %d\n", edata->version);
>> +	if (edata->val_bits & HISI_PCIE_LOCAL_VALID_SOCKET_ID)
>> +		dev_info(dev, "Socket ID = %d\n", edata->socket_id);
>> +	if (edata->val_bits & HISI_PCIE_LOCAL_VALID_NIMBUS_ID)
>> +		dev_info(dev, "Nimbus ID = %d\n", edata->nimbus_id);
>> +	if (edata->val_bits & HISI_PCIE_LOCAL_VALID_SUB_MODULE_ID)
>> +		dev_info(dev, "Sub Module = %s\n",
>> +			 hisi_pcie_get_string(hisi_pcie_sub_module,
>> +
>ARRAY_SIZE(hisi_pcie_sub_module),
>> +					      edata->sub_module_id));
>> +	if (edata->val_bits & HISI_PCIE_LOCAL_VALID_CORE_ID)
>> +		dev_info(dev, "Core ID = core%d\n", edata->core_id);
>> +	if (edata->val_bits & HISI_PCIE_LOCAL_VALID_PORT_ID)
>> +		dev_info(dev, "Port ID = port%d\n", edata->port_id);
>> +	if (edata->val_bits & HISI_PCIE_LOCAL_VALID_ERR_SEVERITY)
>> +		dev_info(dev, "Error severity = %s\n",
>> +			 hisi_pcie_get_string(hisi_pcie_error_sev,
>> +					      ARRAY_SIZE(hisi_pcie_error_sev),
>> +					      edata->err_severity));
>> +	if (edata->val_bits & HISI_PCIE_LOCAL_VALID_ERR_TYPE)
>> +		dev_info(dev, "Error type = 0x%x\n", edata->err_type);
>> +
>> +	dev_info(dev, "Reg Dump:\n");
>> +	idx = HISI_PCIE_LOCAL_VALID_ERR_MISC;
>> +	for_each_set_bit_from(idx, valid_bits,
>> +			      HISI_PCIE_LOCAL_VALID_ERR_MISC +
>HISI_PCIE_ERR_MISC_REGS)
>> +		dev_info(dev, "ERR_MISC_%d = 0x%x\n", idx -
>HISI_PCIE_LOCAL_VALID_ERR_MISC,
>> +			 edata->err_misc[idx -
>HISI_PCIE_LOCAL_VALID_ERR_MISC]);
>> +
>> +	if (edata->err_severity != HISI_PCIE_ERR_SEV_RECOVERABLE)
>> +		return;
>> +
>> +	/* Recovery for the PCIe controller errors, try reset
>> +	 * PCI port for the error recovery
>> +	 */
>> +	rc = hisi_pcie_port_do_recovery(pdev, edata->socket_id,
>> +			HISI_PCIE_PORT_ID(edata->core_id, edata->port_id));
>> +	if (rc)
>> +		dev_info(dev, "fail to do hisi pcie port reset\n"); }
>> +
>> +static int hisi_pcie_notify_error(struct notifier_block *nb,
>> +				  unsigned long event, void *data) {
>> +	struct acpi_hest_generic_data *gdata = data;
>> +	const struct hisi_pcie_error_data *error_data =
>acpi_hest_get_payload(gdata);
>> +	struct hisi_pcie_error_private *priv;
>> +	struct device *dev;
>> +	struct platform_device *pdev;
>> +	guid_t err_sec_guid;
>> +	u8 socket;
>> +
>> +	import_guid(&err_sec_guid, gdata->section_type);
>> +	if (!guid_equal(&err_sec_guid, &hisi_pcie_sec_guid))
>> +		return NOTIFY_DONE;
>> +
>> +	priv = container_of(nb, struct hisi_pcie_error_private, nb);
>> +	dev = priv->dev;
>> +
>> +	if (device_property_read_u8(dev, "socket", &socket))
>> +		return NOTIFY_DONE;
>> +
>> +	if (error_data->socket_id != socket)
>> +		return NOTIFY_DONE;
>> +
>> +	pdev = container_of(dev, struct platform_device, dev);
>> +	hisi_pcie_handle_error(pdev, error_data);
>> +
>> +	return NOTIFY_OK;
>> +}
>> +
>> +static int hisi_pcie_error_handler_probe(struct platform_device
>> +*pdev) {
>> +	struct hisi_pcie_error_private *priv;
>> +	int ret;
>> +
>> +	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
>> +	if (!priv)
>> +		return -ENOMEM;
>> +
>> +	priv->nb.notifier_call = hisi_pcie_notify_error;
>> +	priv->dev = &pdev->dev;
>> +	ret = ghes_register_vendor_record_notifier(&priv->nb);
>> +	if (ret) {
>> +		dev_err(&pdev->dev,
>> +			"Failed to register hisi pcie controller error handler
>with apei\n");
>> +		return ret;
>> +	}
>> +
>> +	platform_set_drvdata(pdev, priv);
>> +
>> +	return 0;
>> +}
>> +
>> +static int hisi_pcie_error_handler_remove(struct platform_device
>> +*pdev) {
>> +	struct hisi_pcie_error_private *priv = platform_get_drvdata(pdev);
>> +
>> +	ghes_unregister_vendor_record_notifier(&priv->nb);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct acpi_device_id hisi_pcie_acpi_match[] = {
>> +	{ "HISI0361", 0 },
>> +	{ }
>> +};
>> +
>> +static struct platform_driver hisi_pcie_error_handler_driver = {
>> +	.driver = {
>> +		.name	= "hisi-pcie-error-handler",
>> +		.acpi_match_table = hisi_pcie_acpi_match,
>> +	},
>> +	.probe		= hisi_pcie_error_handler_probe,
>> +	.remove		= hisi_pcie_error_handler_remove,
>> +};
>> +module_platform_driver(hisi_pcie_error_handler_driver);
>> +
>> +MODULE_DESCRIPTION("HiSilicon HIP PCIe controller error handling
>> +driver"); MODULE_LICENSE("GPL v2");
>> --
>> 2.17.1
>>
>>
>
>--
>With Best Regards,
>Andy Shevchenko
>
Thanks,
Shiju

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