Re: [PATCH v4 2/8] hwtracing: Add trace function support for HiSilicon PCIe Tune and Trace device

From: Jonathan Cameron via iommu <iommu@lists.linux-foundation.org>
To: Yicong Yang <yangyicong@hisilicon.com>
Cc: mark.rutland@arm.com, prime.zeng@huawei.com,
	alexander.shishkin@linux.intel.com, linux-pci@vger.kernel.org,
	linuxarm@huawei.com, will@kernel.org, daniel.thompson@linaro.org,
	peterz@infradead.org, mingo@redhat.com, helgaas@kernel.org,
	liuqi115@huawei.com, mike.leach@linaro.org,
	suzuki.poulose@arm.com, coresight@lists.linaro.org,
	acme@kernel.org, zhangshaokun@hisilicon.com,
	linux-arm-kernel@lists.infradead.org, mathieu.poirier@linaro.org,
	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
	linux-perf-users@vger.kernel.org,
	iommu@lists.linux-foundation.org, leo.yan@linaro.org,
	robin.murphy@arm.com
Subject: Re: [PATCH v4 2/8] hwtracing: Add trace function support for HiSilicon PCIe Tune and Trace device
Date: Mon, 21 Feb 2022 11:18:12 +0000	[thread overview]
Message-ID: <20220221111812.00004c0f@Huawei.com> (raw)
In-Reply-To: <20220221084307.33712-3-yangyicong@hisilicon.com>

On Mon, 21 Feb 2022 16:43:01 +0800
Yicong Yang <yangyicong@hisilicon.com> wrote:

> HiSilicon PCIe tune and trace device(PTT) is a PCIe Root Complex
> integrated Endpoint(RCiEP) device, providing the capability
> to dynamically monitor and tune the PCIe traffic, and trace
> the TLP headers.
> 
> Add the driver for the device to enable the trace function.
> This patch adds basic function of trace, including the device's
> probe and initialization, functions for trace buffer allocation
> and trace enable/disable, register an interrupt handler to
> simply response to the DMA events. The user interface of trace
> will be added in the following patch.
> 
> Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>

Hi Yicong,

A few really minor things inline, particularly one place
where you can improve the error handling.
It's always fiddly to handle errors in a pci_walk_bus() but
in this case it's not too difficult as you just need to store
the retval somewhere in the private data then retrieve it
after the pci_walk_bus() call.

Thanks,

Jonathan

> ---
>  drivers/Makefile                 |   1 +
>  drivers/hwtracing/Kconfig        |   2 +
>  drivers/hwtracing/ptt/Kconfig    |  11 +
>  drivers/hwtracing/ptt/Makefile   |   2 +
>  drivers/hwtracing/ptt/hisi_ptt.c | 370 +++++++++++++++++++++++++++++++
>  drivers/hwtracing/ptt/hisi_ptt.h | 149 +++++++++++++
>  6 files changed, 535 insertions(+)
>  create mode 100644 drivers/hwtracing/ptt/Kconfig
>  create mode 100644 drivers/hwtracing/ptt/Makefile
>  create mode 100644 drivers/hwtracing/ptt/hisi_ptt.c
>  create mode 100644 drivers/hwtracing/ptt/hisi_ptt.h
> 
> diff --git a/drivers/Makefile b/drivers/Makefile
> index a110338c860c..ab3411e4eba5 100644
> --- a/drivers/Makefile
> +++ b/drivers/Makefile
> @@ -175,6 +175,7 @@ obj-$(CONFIG_USB4)		+= thunderbolt/
>  obj-$(CONFIG_CORESIGHT)		+= hwtracing/coresight/
>  obj-y				+= hwtracing/intel_th/
>  obj-$(CONFIG_STM)		+= hwtracing/stm/
> +obj-$(CONFIG_HISI_PTT)		+= hwtracing/ptt/
>  obj-$(CONFIG_ANDROID)		+= android/
>  obj-$(CONFIG_NVMEM)		+= nvmem/
>  obj-$(CONFIG_FPGA)		+= fpga/
> diff --git a/drivers/hwtracing/Kconfig b/drivers/hwtracing/Kconfig
> index 13085835a636..911ee977103c 100644
> --- a/drivers/hwtracing/Kconfig
> +++ b/drivers/hwtracing/Kconfig
> @@ -5,4 +5,6 @@ source "drivers/hwtracing/stm/Kconfig"
>  
>  source "drivers/hwtracing/intel_th/Kconfig"
>  
> +source "drivers/hwtracing/ptt/Kconfig"
> +
>  endmenu
> diff --git a/drivers/hwtracing/ptt/Kconfig b/drivers/hwtracing/ptt/Kconfig
> new file mode 100644
> index 000000000000..41fa83921a07
> --- /dev/null
> +++ b/drivers/hwtracing/ptt/Kconfig
> @@ -0,0 +1,11 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +config HISI_PTT
> +	tristate "HiSilicon PCIe Tune and Trace Device"
> +	depends on ARM64 && PCI && HAS_DMA && HAS_IOMEM
> +	help
> +	  HiSilicon PCIe Tune and Trace Device exists as a PCIe RCiEP
> +	  device, and it provides support for PCIe traffic tuning and
> +	  tracing TLP headers to the memory.
> +
> +	  This driver can also be built as a module. If so, the module
> +	  will be called hisi_ptt.
> diff --git a/drivers/hwtracing/ptt/Makefile b/drivers/hwtracing/ptt/Makefile
> new file mode 100644
> index 000000000000..908c09a98161
> --- /dev/null
> +++ b/drivers/hwtracing/ptt/Makefile
> @@ -0,0 +1,2 @@
> +# SPDX-License-Identifier: GPL-2.0
> +obj-$(CONFIG_HISI_PTT) += hisi_ptt.o
> diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c
> new file mode 100644
> index 000000000000..a5b4f09ccd1e
> --- /dev/null
> +++ b/drivers/hwtracing/ptt/hisi_ptt.c
> @@ -0,0 +1,370 @@

...

> +static void hisi_ptt_free_trace_buf(struct hisi_ptt *hisi_ptt)
> +{
> +	struct hisi_ptt_trace_ctrl *ctrl = &hisi_ptt->trace_ctrl;
> +	struct device *dev = &hisi_ptt->pdev->dev;
> +	int i;
> +
> +	if (!ctrl->trace_buf)
> +		return;
> +
> +	for (i = 0; i < HISI_PTT_TRACE_BUF_CNT; i++)
> +		if (ctrl->trace_buf[i].addr)
> +			dma_free_coherent(dev, HISI_PTT_TRACE_BUF_SIZE,
> +					  ctrl->trace_buf[i].addr,
> +					  ctrl->trace_buf[i].dma);
> +
> +	kfree(ctrl->trace_buf);
> +	ctrl->trace_buf = NULL;
> +}
> +
> +static int hisi_ptt_alloc_trace_buf(struct hisi_ptt *hisi_ptt)
> +{
> +	struct hisi_ptt_trace_ctrl *ctrl = &hisi_ptt->trace_ctrl;
> +	struct device *dev = &hisi_ptt->pdev->dev;
> +	int i;
> +
> +	hisi_ptt->trace_ctrl.buf_index = 0;
> +
> +	/* If the trace buffer has already been allocated, zero it. */
> +	if (ctrl->trace_buf) {
> +		for (i = 0; i < HISI_PTT_TRACE_BUF_CNT; i++)
> +			memset(ctrl->trace_buf[i].addr, 0, HISI_PTT_TRACE_BUF_SIZE);
> +		return 0;
> +	}
> +
> +	ctrl->trace_buf = kcalloc(HISI_PTT_TRACE_BUF_CNT, sizeof(struct hisi_ptt_dma_buffer),

Slight preference for sizeof(*ctrl->trace_buf) as it saves a reviewer from scrolling down
to check the type is correct.

> +				  GFP_KERNEL);
> +	if (!ctrl->trace_buf)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < HISI_PTT_TRACE_BUF_CNT; ++i) {
> +		ctrl->trace_buf[i].addr = dma_alloc_coherent(dev, HISI_PTT_TRACE_BUF_SIZE,
> +							     &ctrl->trace_buf[i].dma,
> +							     GFP_KERNEL);
> +		if (!ctrl->trace_buf[i].addr) {
> +			hisi_ptt_free_trace_buf(hisi_ptt);
> +			return -ENOMEM;
> +		}
> +	}
> +
> +	return 0;
> +}
> +

...

> +
> +static int hisi_ptt_init_filters(struct pci_dev *pdev, void *data)
> +{
> +	struct hisi_ptt_filter_desc *filter;
> +	struct hisi_ptt *hisi_ptt = data;
> +	struct list_head *target_list;
> +
> +	target_list = pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT ?
> +		      &hisi_ptt->port_filters : &hisi_ptt->req_filters;
> +
> +	filter = kzalloc(sizeof(*filter), GFP_KERNEL);
> +	if (!filter)

As below, if this happens we'll be left in an odd intermediate state
where the error is not communicated up to the probe function but the
filters are only partly set up.

> +		return -ENOMEM;
> +
> +	filter->pdev = pdev;
> +	list_add_tail(&filter->list, target_list);
> +
> +	/* Update the available port mask */
> +	if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT)
> +		hisi_ptt->port_mask |= hisi_ptt_get_filter_val(pdev);
> +
> +	return 0;
> +}
> +
> +static void hisi_ptt_release_filters(struct hisi_ptt *hisi_ptt)
> +{
> +	struct hisi_ptt_filter_desc *filter, *tfilter;
> +
> +	list_for_each_entry_safe(filter, tfilter, &hisi_ptt->req_filters, list) {
> +		list_del(&filter->list);
> +		kfree(filter);
> +	}
> +
> +	list_for_each_entry_safe(filter, tfilter, &hisi_ptt->port_filters, list) {
> +		list_del(&filter->list);
> +		kfree(filter);
> +	}
> +}
> +
> +static void hisi_ptt_init_ctrls(struct hisi_ptt *hisi_ptt)
> +{
> +	struct pci_dev *pdev = hisi_ptt->pdev;
> +	struct pci_bus *bus;
> +	u32 reg;
> +
> +	INIT_LIST_HEAD(&hisi_ptt->port_filters);
> +	INIT_LIST_HEAD(&hisi_ptt->req_filters);
> +
> +	/*
> +	 * The device range register provides the information about the
> +	 * root ports which the RCiEP can control and trace. The RCiEP
> +	 * and the root ports it support are on the same PCIe core, with
> +	 * same domain number but maybe different bus number. The device
> +	 * range register will tell us which root ports we can support,
> +	 * Bit[31:16] indicates the upper BDF numbers of the root port,
> +	 * while Bit[15:0] indicates the lower.
> +	 */
> +	reg = readl(hisi_ptt->iobase + HISI_PTT_DEVICE_RANGE);
> +	hisi_ptt->upper = FIELD_GET(HISI_PTT_DEVICE_RANGE_UPPER, reg);
> +	hisi_ptt->lower = FIELD_GET(HISI_PTT_DEVICE_RANGE_LOWER, reg);
> +
> +	bus = pci_find_bus(pci_domain_nr(pdev->bus), PCI_BUS_NUM(hisi_ptt->upper));
> +	if (bus)
> +		pci_walk_bus(bus, hisi_ptt_init_filters, hisi_ptt);

Error handling needed for the hisi_ptt_init_filters call though that will require
placing a retval somewhere in hisi_ptt so we can know there was an error.

> +
> +	hisi_ptt->trace_ctrl.default_cpu = cpumask_first(cpumask_of_node(dev_to_node(&pdev->dev)));
> +}
> +
> +/*
> + * The DMA of PTT trace can only use direct mapping, due to some
> + * hardware restriction. Check whether there is an IOMMU or the
> + * policy of the IOMMU domain is passthrough, otherwise the trace
> + * cannot work.
> + *
> + * The PTT device is supposed to behind the ARM SMMUv3, which
> + * should have passthrough the device by a quirk.

Trivial but perhaps a clearer wording is:

The PTT Device is behind an ARM SMMUv3 which should be set to
passthrough for this device using a quirk.

> + */
> +static int hisi_ptt_check_iommu_mapping(struct pci_dev *pdev)
> +{
> +	struct iommu_domain *iommu_domain;
> +
> +	iommu_domain = iommu_get_domain_for_dev(&pdev->dev);
> +	if (!iommu_domain || iommu_domain->type == IOMMU_DOMAIN_IDENTITY)
> +		return 0;
> +
> +	return -EOPNOTSUPP;
> +}
> +
> +static int hisi_ptt_probe(struct pci_dev *pdev,
> +			  const struct pci_device_id *id)
> +{
> +	struct hisi_ptt *hisi_ptt;
> +	int ret;
> +
> +	ret = hisi_ptt_check_iommu_mapping(pdev);
> +	if (ret) {
> +		pci_err(pdev, "cannot work with non-direct DMA mapping.\n");
> +		return ret;
> +	}
> +
> +	hisi_ptt = devm_kzalloc(&pdev->dev, sizeof(*hisi_ptt), GFP_KERNEL);
> +	if (!hisi_ptt)
> +		return -ENOMEM;
> +
> +	mutex_init(&hisi_ptt->mutex);
> +	hisi_ptt->pdev = pdev;
> +	pci_set_drvdata(pdev, hisi_ptt);
> +
> +	ret = pcim_enable_device(pdev);
> +	if (ret) {
> +		pci_err(pdev, "failed to enable device, ret = %d.\n", ret);
> +		return ret;
> +	}
> +
> +	ret = pcim_iomap_regions(pdev, BIT(2), DRV_NAME);
> +	if (ret) {
> +		pci_err(pdev, "failed to remap io memory, ret = %d.\n", ret);
> +		return ret;
> +	}
> +
> +	hisi_ptt->iobase = pcim_iomap_table(pdev)[2];
> +
> +	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
> +	if (ret) {
> +		pci_err(pdev, "failed to set 64 bit dma mask, ret = %d.\n", ret);
> +		return ret;
> +	}
> +	pci_set_master(pdev);
> +
> +	ret = hisi_ptt_register_irq(hisi_ptt);
> +	if (ret)
> +		return ret;
> +
> +	hisi_ptt_init_ctrls(hisi_ptt);

There are some elements of this call that can fail so probably should return an
error code an have appropriate cleanup in here.

> +
> +	return 0;
> +}

...
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