Merge tag 'coresight-next-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/coresight/linux into char-misc-next

Suzuki writes:

coresigh: Updates for v6.6

Coresight and hwtracing subsystem updates for Linux v6.6 includes:

- ACPI support for CoreSight ETMv4x via system instructions and Arm ETE (v9.x).
- Fix potential sleeping in atomic context for TRBE driver
- Fix memory leak in ACPI platform parsing code
- Fix all warnings with W=1
- Fix warning with double free attempt for TRBE platform data
- Miscellaneous cleanups and fixes

Signed-off-by: Suzuki K Poulose <[e-mail]>

* tag 'coresight-next-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/coresight/linux:
coresight: trbe: Fix TRBE potential sleep in atomic context
coresight: Fix memory leak in acpi_buffer->pointer
coresight: etm4x: Ensure valid drvdata and clock before clk_put()
coresight: trbe: Allocate platform data per device
hwtracing: hisi_ptt: Use pci_dev_id() to simplify the code
coresight: dummy: simplify the code with module_platform_driver
coresight: tmc: Explicit type conversions to prevent integer overflow
coresight: trbe: Directly use ID_AA64DFR0_EL1_TraceBuffer_IMP
coresight: Fix all W=1 build warnings
coresight: etm4x: Add ACPI support in platform driver
coresight: platform: acpi: Ignore the absence of graph
coresight: etm4x: Change etm4_platform_driver driver for MMIO devices
coresight: etm4x: Drop pid argument from etm4_probe()
coresight: etm4x: Drop iomem 'base' argument from etm4_probe()
coresight: etm4x: Allocate and device assign 'struct etmv4_drvdata' earlier
hwtracing: coresight: Explicitly include correct DT includes

drivers/acpi/acpi_amba.c

···
 static const struct acpi_device_id amba_id_list[] = {
 	{"ARMH0061", 0}, /* PL061 GPIO Device */
 	{"ARMH0330", 0}, /* ARM DMA Controller DMA-330 */
-	{"ARMHC500", 0}, /* ARM CoreSight ETM4x */
 	{"ARMHC501", 0}, /* ARM CoreSight ETR */
 	{"ARMHC502", 0}, /* ARM CoreSight STM */
 	{"ARMHC503", 0}, /* ARM CoreSight Debug */

drivers/hwtracing/coresight/coresight-core.c

···
 #include <linux/mutex.h>
 #include <linux/clk.h>
 #include <linux/coresight.h>
-#include <linux/of_platform.h>
+#include <linux/property.h>
 #include <linux/delay.h>
 #include <linux/pm_runtime.h>
 

drivers/hwtracing/coresight/coresight-cti-core.c

···
 #include "coresight-priv.h"
 #include "coresight-cti.h"
 
-/**
+/*
  * CTI devices can be associated with a PE, or be connected to CoreSight
  * hardware. We have a list of all CTIs irrespective of CPU bound or
  * otherwise.

drivers/hwtracing/coresight/coresight-dummy.c

···
 	},
 };
 
-static int __init dummy_init(void)
-{
-	return platform_driver_register(&dummy_driver);
-}
-module_init(dummy_init);
-
-static void __exit dummy_exit(void)
-{
-	platform_driver_unregister(&dummy_driver);
-}
-module_exit(dummy_exit);
+module_platform_driver(dummy_driver);
 
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("CoreSight dummy driver");

drivers/hwtracing/coresight/coresight-etm4x-cfg.c

···
  * Invalid offsets will result in fail code return and feature load failure.
  *
  * @drvdata:	driver data to map into.
- * @reg:	register to map.
+ * @reg_csdev:	register to map.
  * @offset:	device offset for the register
  */
 static int etm4_cfg_map_reg_offset(struct etmv4_drvdata *drvdata,
···
  * etm4_cfg_load_feature - load a feature into a device instance.
  *
  * @csdev:	An ETMv4 CoreSight device.
- * @feat:	The feature to be loaded.
+ * @feat_csdev:	The feature to be loaded.
  *
  * The function will load a feature instance into the device, checking that
  * the register definitions are valid for the device.

drivers/hwtracing/coresight/coresight-etm4x-core.c

···
  * Copyright (c) 2014, The Linux Foundation. All rights reserved.
  */
 
+#include <linux/acpi.h>
 #include <linux/bitops.h>
 #include <linux/kernel.h>
 #include <linux/moduleparam.h>
···
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/property.h>
+#include <linux/clk/clk-conf.h>
 
 #include <asm/barrier.h>
 #include <asm/sections.h>
···
 static enum cpuhp_state hp_online;
 
 struct etm4_init_arg {
-	unsigned int		pid;
 	struct device		*dev;
 	struct csdev_access	*csa;
 };
···
 }
 
 static void etm4_check_arch_features(struct etmv4_drvdata *drvdata,
-				      unsigned int id)
+				     struct csdev_access *csa)
 {
-	if (etm4_hisi_match_pid(id))
+	/*
+	 * TRCPIDR* registers are not required for ETMs with system
+	 * instructions. They must be identified by the MIDR+REVIDRs.
+	 * Skip the TRCPID checks for now.
+	 */
+	if (!csa->io_mem)
+		return;
+
+	if (etm4_hisi_match_pid(coresight_get_pid(csa)))
 		set_bit(ETM4_IMPDEF_HISI_CORE_COMMIT, drvdata->arch_features);
 }
 #else
···
 }
 
 static void etm4_check_arch_features(struct etmv4_drvdata *drvdata,
-				     unsigned int id)
+				     struct csdev_access *csa)
 {
 }
 #endif /* CONFIG_ETM4X_IMPDEF_FEATURE */
···
 	return true;
 }
 
+static bool is_devtype_cpu_trace(void __iomem *base)
+{
+	u32 devtype = readl(base + TRCDEVTYPE);
+
+	return (devtype == CS_DEVTYPE_PE_TRACE);
+}
+
 static bool etm4_init_iomem_access(struct etmv4_drvdata *drvdata,
 				   struct csdev_access *csa)
 {
 	u32 devarch = readl_relaxed(drvdata->base + TRCDEVARCH);
+
+	if (!is_coresight_device(drvdata->base) || !is_devtype_cpu_trace(drvdata->base))
+		return false;
 
 	/*
 	 * All ETMs must implement TRCDEVARCH to indicate that
···
 	etm4_os_unlock_csa(drvdata, csa);
 	etm4_cs_unlock(drvdata, csa);
 
-	etm4_check_arch_features(drvdata, init_arg->pid);
+	etm4_check_arch_features(drvdata, csa);
 
 	/* find all capabilities of the tracing unit */
 	etmidr0 = etm4x_relaxed_read32(csa, TRCIDR0);
···
 	return 0;
 }
 
-static int etm4_probe(struct device *dev, void __iomem *base, u32 etm_pid)
+static int etm4_probe(struct device *dev)
 {
-	struct etmv4_drvdata *drvdata;
+	struct etmv4_drvdata *drvdata = dev_get_drvdata(dev);
 	struct csdev_access access = { 0 };
 	struct etm4_init_arg init_arg = { 0 };
 	struct etm4_init_arg *delayed;
 
-	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
-	if (!drvdata)
+	if (WARN_ON(!drvdata))
 		return -ENOMEM;
-
-	dev_set_drvdata(dev, drvdata);
 
 	if (pm_save_enable == PARAM_PM_SAVE_FIRMWARE)
 		pm_save_enable = coresight_loses_context_with_cpu(dev) ?
···
 			return -ENOMEM;
 	}
 
-	drvdata->base = base;
-
 	spin_lock_init(&drvdata->spinlock);
 
 	drvdata->cpu = coresight_get_cpu(dev);
···
 
 	init_arg.dev = dev;
 	init_arg.csa = &access;
-	init_arg.pid = etm_pid;
 
 	/*
 	 * Serialize against CPUHP callbacks to avoid race condition
···
 
 static int etm4_probe_amba(struct amba_device *adev, const struct amba_id *id)
 {
+	struct etmv4_drvdata *drvdata;
 	void __iomem *base;
 	struct device *dev = &adev->dev;
 	struct resource *res = &adev->res;
···
 	if (IS_ERR(base))
 		return PTR_ERR(base);
 
-	ret = etm4_probe(dev, base, id->id);
+	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+
+	drvdata->base = base;
+	dev_set_drvdata(dev, drvdata);
+	ret = etm4_probe(dev);
 	if (!ret)
 		pm_runtime_put(&adev->dev);
 
···
 
 static int etm4_probe_platform_dev(struct platform_device *pdev)
 {
+	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	struct etmv4_drvdata *drvdata;
 	int ret;
 
+	drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+
+	drvdata->pclk = coresight_get_enable_apb_pclk(&pdev->dev);
+	if (IS_ERR(drvdata->pclk))
+		return -ENODEV;
+
+	if (res) {
+		drvdata->base = devm_ioremap_resource(&pdev->dev, res);
+		if (IS_ERR(drvdata->base)) {
+			clk_put(drvdata->pclk);
+			return PTR_ERR(drvdata->base);
+		}
+	}
+
+	dev_set_drvdata(&pdev->dev, drvdata);
 	pm_runtime_get_noresume(&pdev->dev);
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 
-	/*
-	 * System register based devices could match the
-	 * HW by reading appropriate registers on the HW
-	 * and thus we could skip the PID.
-	 */
-	ret = etm4_probe(&pdev->dev, NULL, 0);
+	ret = etm4_probe(&pdev->dev);
 
 	pm_runtime_put(&pdev->dev);
 	return ret;
···
 		/*  ETMv4 UCI data */
 		.devarch	= ETM_DEVARCH_ETMv4x_ARCH,
 		.devarch_mask	= ETM_DEVARCH_ID_MASK,
-		.devtype	= 0x00000013,
+		.devtype	= CS_DEVTYPE_PE_TRACE,
 	}
 };
 
···
 	if (drvdata)
 		etm4_remove_dev(drvdata);
 	pm_runtime_disable(&pdev->dev);
+
+	if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
+		clk_put(drvdata->pclk);
+
 	return 0;
 }
 
···
 	.id_table	= etm4_ids,
 };
 
+#ifdef CONFIG_PM
+static int etm4_runtime_suspend(struct device *dev)
+{
+	struct etmv4_drvdata *drvdata = dev_get_drvdata(dev);
+
+	if (drvdata->pclk && !IS_ERR(drvdata->pclk))
+		clk_disable_unprepare(drvdata->pclk);
+
+	return 0;
+}
+
+static int etm4_runtime_resume(struct device *dev)
+{
+	struct etmv4_drvdata *drvdata = dev_get_drvdata(dev);
+
+	if (drvdata->pclk && !IS_ERR(drvdata->pclk))
+		clk_prepare_enable(drvdata->pclk);
+
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops etm4_dev_pm_ops = {
+	SET_RUNTIME_PM_OPS(etm4_runtime_suspend, etm4_runtime_resume, NULL)
+};
+
 static const struct of_device_id etm4_sysreg_match[] = {
 	{ .compatible	= "arm,coresight-etm4x-sysreg" },
 	{ .compatible	= "arm,embedded-trace-extension" },
 	{}
 };
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id etm4x_acpi_ids[] = {
+	{"ARMHC500", 0}, /* ARM CoreSight ETM4x */
+	{}
+};
+MODULE_DEVICE_TABLE(acpi, etm4x_acpi_ids);
+#endif
 
 static struct platform_driver etm4_platform_driver = {
 	.probe		= etm4_probe_platform_dev,
···
 	.driver			= {
 		.name			= "coresight-etm4x",
 		.of_match_table		= etm4_sysreg_match,
+		.acpi_match_table	= ACPI_PTR(etm4x_acpi_ids),
 		.suppress_bind_attrs	= true,
+		.pm			= &etm4_dev_pm_ops,
 	},
 };
 

drivers/hwtracing/coresight/coresight-etm4x.h

···
 #define ETM_DEVARCH_ETE_ARCH						\
 	(ETM_DEVARCH_ARCHITECT_ARM | ETM_DEVARCH_ARCHID_ETE | ETM_DEVARCH_PRESENT)
 
+#define CS_DEVTYPE_PE_TRACE		0x00000013
+
 #define TRCSTATR_IDLE_BIT		0
 #define TRCSTATR_PMSTABLE_BIT		1
 #define ETM_DEFAULT_ADDR_COMP		0
···
 
 /**
  * struct etm4_drvdata - specifics associated to an ETM component
+ * @pclk        APB clock if present, otherwise NULL
  * @base:       Memory mapped base address for this component.
  * @csdev:      Component vitals needed by the framework.
  * @spinlock:   Only one at a time pls.
···
  * @arch_features: Bitmap of arch features of etmv4 devices.
  */
 struct etmv4_drvdata {
+	struct clk			*pclk;
 	void __iomem			*base;
 	struct coresight_device		*csdev;
 	spinlock_t			spinlock;

drivers/hwtracing/coresight/coresight-platform.c

···
 #include <linux/slab.h>
 #include <linux/clk.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
 #include <linux/of_graph.h>
-#include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/amba/bus.h>
 #include <linux/coresight.h>
···
 
 /* acpi_get_dsd_graph	- Find the _DSD Graph property for the given device. */
 static const union acpi_object *
-acpi_get_dsd_graph(struct acpi_device *adev)
+acpi_get_dsd_graph(struct acpi_device *adev, struct acpi_buffer *buf)
 {
 	int i;
-	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
 	acpi_status status;
 	const union acpi_object *dsd;
 
 	status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL,
-					    &buf, ACPI_TYPE_PACKAGE);
+					    buf, ACPI_TYPE_PACKAGE);
 	if (ACPI_FAILURE(status))
 		return NULL;
 
-	dsd = buf.pointer;
+	dsd = buf->pointer;
 
 	/*
 	 * _DSD property consists tuples { Prop_UUID, Package() }
···
  * returns NULL.
  */
 static const union acpi_object *
-acpi_get_coresight_graph(struct acpi_device *adev)
+acpi_get_coresight_graph(struct acpi_device *adev, struct acpi_buffer *buf)
 {
 	const union acpi_object *graph_list, *graph;
 	int i, nr_graphs;
 
-	graph_list = acpi_get_dsd_graph(adev);
+	graph_list = acpi_get_dsd_graph(adev, buf);
 	if (!graph_list)
 		return graph_list;
 
···
 				      struct acpi_device *adev,
 				      struct coresight_platform_data *pdata)
 {
+	int ret = 0;
 	int i, nlinks;
 	const union acpi_object *graph;
 	struct coresight_connection conn, zero_conn = {};
 	struct coresight_connection *new_conn;
+	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
 
-	graph = acpi_get_coresight_graph(adev);
+	graph = acpi_get_coresight_graph(adev, &buf);
+	/*
+	 * There are no graph connections, which is fine for some components.
+	 * e.g., ETE
+	 */
 	if (!graph)
-		return -ENOENT;
+		goto free;
 
 	nlinks = graph->package.elements[2].integer.value;
 	if (!nlinks)
-		return 0;
+		goto free;
 
 	for (i = 0; i < nlinks; i++) {
 		const union acpi_object *link = &graph->package.elements[3 + i];
···
 
 		conn = zero_conn;
 		dir = acpi_coresight_parse_link(adev, link, &conn);
-		if (dir < 0)
-			return dir;
+		if (dir < 0) {
+			ret = dir;
+			goto free;
+		}
 
 		if (dir == ACPI_CORESIGHT_LINK_MASTER) {
 			new_conn = coresight_add_out_conn(dev, pdata, &conn);
-			if (IS_ERR(new_conn))
-				return PTR_ERR(new_conn);
+			if (IS_ERR(new_conn)) {
+				ret = PTR_ERR(new_conn);
+				goto free;
+			}
 		}
 	}
 
-	return 0;
+free:
+	/*
+	 * When ACPI fails to alloc a buffer, it will free the buffer
+	 * created via ACPI_ALLOCATE_BUFFER and set to NULL.
+	 * ACPI_FREE can handle NULL pointers, so free it directly.
+	 */
+	ACPI_FREE(buf.pointer);
+	return ret;
 }
 
 /*

drivers/hwtracing/coresight/coresight-tmc-etf.c

···
 		return -EINVAL;
 
 	/* wrap head around to the amount of space we have */
-	head = handle->head & ((buf->nr_pages << PAGE_SHIFT) - 1);
+	head = handle->head & (((unsigned long)buf->nr_pages << PAGE_SHIFT) - 1);
 
 	/* find the page to write to */
 	buf->cur = head / PAGE_SIZE;

drivers/hwtracing/coresight/coresight-tmc-etr.c

···
 };
 
 /* Convert the perf index to an offset within the ETR buffer */
-#define PERF_IDX2OFF(idx, buf)	((idx) % ((buf)->nr_pages << PAGE_SHIFT))
+#define PERF_IDX2OFF(idx, buf)		\
+		((idx) % ((unsigned long)(buf)->nr_pages << PAGE_SHIFT))
 
 /* Lower limit for ETR hardware buffer */
 #define TMC_ETR_PERF_MIN_BUF_SIZE	SZ_1M
···
 	 * than the size requested via sysfs.
 	 */
 	if ((nr_pages << PAGE_SHIFT) > drvdata->size) {
-		etr_buf = tmc_alloc_etr_buf(drvdata, (nr_pages << PAGE_SHIFT),
+		etr_buf = tmc_alloc_etr_buf(drvdata, ((ssize_t)nr_pages << PAGE_SHIFT),
 					    0, node, NULL);
 		if (!IS_ERR(etr_buf))
 			goto done;

drivers/hwtracing/coresight/coresight-tmc.h

···
 static inline unsigned long
 tmc_sg_table_buf_size(struct tmc_sg_table *sg_table)
 {
-	return sg_table->data_pages.nr_pages << PAGE_SHIFT;
+	return (unsigned long)sg_table->data_pages.nr_pages << PAGE_SHIFT;
 }
 
 struct coresight_device *tmc_etr_get_catu_device(struct tmc_drvdata *drvdata);

drivers/hwtracing/coresight/coresight-trbe.c

···
 	enable_percpu_irq(drvdata->irq, IRQ_TYPE_NONE);
 }
 
+static void arm_trbe_disable_cpu(void *info)
+{
+	struct trbe_drvdata *drvdata = info;
+	struct trbe_cpudata *cpudata = this_cpu_ptr(drvdata->cpudata);
+
+	disable_percpu_irq(drvdata->irq);
+	trbe_reset_local(cpudata);
+}
+
+
 static void arm_trbe_register_coresight_cpu(struct trbe_drvdata *drvdata, int cpu)
 {
 	struct trbe_cpudata *cpudata = per_cpu_ptr(drvdata->cpudata, cpu);
···
 	if (!desc.name)
 		goto cpu_clear;
 
+	desc.pdata = coresight_get_platform_data(dev);
+	if (IS_ERR(desc.pdata))
+		goto cpu_clear;
+
 	desc.type = CORESIGHT_DEV_TYPE_SINK;
 	desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PERCPU_SYSMEM;
 	desc.ops = &arm_trbe_cs_ops;
-	desc.pdata = dev_get_platdata(dev);
 	desc.groups = arm_trbe_groups;
 	desc.dev = dev;
 	trbe_csdev = coresight_register(&desc);
···
 	cpumask_clear_cpu(cpu, &drvdata->supported_cpus);
 }
 
-static void arm_trbe_remove_coresight_cpu(void *info)
+static void arm_trbe_remove_coresight_cpu(struct trbe_drvdata *drvdata, int cpu)
 {
-	int cpu = smp_processor_id();
-	struct trbe_drvdata *drvdata = info;
-	struct trbe_cpudata *cpudata = per_cpu_ptr(drvdata->cpudata, cpu);
 	struct coresight_device *trbe_csdev = coresight_get_percpu_sink(cpu);
 
-	disable_percpu_irq(drvdata->irq);
-	trbe_reset_local(cpudata);
 	if (trbe_csdev) {
 		coresight_unregister(trbe_csdev);
-		cpudata->drvdata = NULL;
 		coresight_set_percpu_sink(cpu, NULL);
 	}
 }
···
 {
 	int cpu;
 
-	for_each_cpu(cpu, &drvdata->supported_cpus)
-		smp_call_function_single(cpu, arm_trbe_remove_coresight_cpu, drvdata, 1);
+	for_each_cpu(cpu, &drvdata->supported_cpus) {
+		smp_call_function_single(cpu, arm_trbe_disable_cpu, drvdata, 1);
+		arm_trbe_remove_coresight_cpu(drvdata, cpu);
+	}
 	free_percpu(drvdata->cpudata);
 	return 0;
 }
···
 {
 	struct trbe_drvdata *drvdata = hlist_entry_safe(node, struct trbe_drvdata, hotplug_node);
 
-	if (cpumask_test_cpu(cpu, &drvdata->supported_cpus)) {
-		struct trbe_cpudata *cpudata = per_cpu_ptr(drvdata->cpudata, cpu);
-
-		disable_percpu_irq(drvdata->irq);
-		trbe_reset_local(cpudata);
-	}
+	if (cpumask_test_cpu(cpu, &drvdata->supported_cpus))
+		arm_trbe_disable_cpu(drvdata);
 	return 0;
 }
 
···
 
 static int arm_trbe_device_probe(struct platform_device *pdev)
 {
-	struct coresight_platform_data *pdata;
 	struct trbe_drvdata *drvdata;
 	struct device *dev = &pdev->dev;
 	int ret;
···
 	if (!drvdata)
 		return -ENOMEM;
 
-	pdata = coresight_get_platform_data(dev);
-	if (IS_ERR(pdata))
-		return PTR_ERR(pdata);
-
 	dev_set_drvdata(dev, drvdata);
-	dev->platform_data = pdata;
 	drvdata->pdev = pdev;
 	ret = arm_trbe_probe_irq(pdev, drvdata);
 	if (ret)

drivers/hwtracing/coresight/coresight-trbe.h

···
 	unsigned int trbe = cpuid_feature_extract_unsigned_field(aa64dfr0,
 								 ID_AA64DFR0_EL1_TraceBuffer_SHIFT);
 
-	return trbe >= 0b0001;
+	return trbe >= ID_AA64DFR0_EL1_TraceBuffer_IMP;
 }
 
 static inline bool is_trbe_enabled(void)

drivers/hwtracing/ptt/hisi_ptt.c

···
 	if (!root_port)
 		return 0;
 
-	port_devid = PCI_DEVID(root_port->bus->number, root_port->devfn);
+	port_devid = pci_dev_id(root_port);
 	if (port_devid < hisi_ptt->lower_bdf ||
 	    port_devid > hisi_ptt->upper_bdf)
 		return 0;
 
 	info.is_port = pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT;
-	info.devid = PCI_DEVID(pdev->bus->number, pdev->devfn);
+	info.devid = pci_dev_id(pdev);
 
 	switch (action) {
 	case BUS_NOTIFY_ADD_DEVICE:
···
 	if (!root_port)
 		return 0;
 
-	port_devid = PCI_DEVID(root_port->bus->number, root_port->devfn);
+	port_devid = pci_dev_id(root_port);
 	if (port_devid < hisi_ptt->lower_bdf ||
 	    port_devid > hisi_ptt->upper_bdf)
 		return 0;
···
 	 * should be partial initialized and users would know which filter fails
 	 * through the log. Other functions of PTT device are still available.
 	 */
-	filter = hisi_ptt_alloc_add_filter(hisi_ptt, PCI_DEVID(pdev->bus->number, pdev->devfn),
+	filter = hisi_ptt_alloc_add_filter(hisi_ptt, pci_dev_id(pdev),
 					    pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT);
 	if (!filter)
 		return -ENOMEM;

include/linux/coresight.h

···
 #ifndef _LINUX_CORESIGHT_H
 #define _LINUX_CORESIGHT_H
 
+#include <linux/amba/bus.h>
+#include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/io.h>
 #include <linux/perf_event.h>
···
 		return readl_relaxed(csa->base + offset);
 
 	return csa->read(offset, true, false);
+}
+
+#define CORESIGHT_CIDRn(i)	(0xFF0 + ((i) * 4))
+
+static inline u32 coresight_get_cid(void __iomem *base)
+{
+	u32 i, cid = 0;
+
+	for (i = 0; i < 4; i++)
+		cid |= readl(base + CORESIGHT_CIDRn(i)) << (i * 8);
+
+	return cid;
+}
+
+static inline bool is_coresight_device(void __iomem *base)
+{
+	u32 cid = coresight_get_cid(base);
+
+	return cid == CORESIGHT_CID;
+}
+
+/*
+ * Attempt to find and enable "APB clock" for the given device
+ *
+ * Returns:
+ *
+ * clk   - Clock is found and enabled
+ * NULL  - clock is not found
+ * ERROR - Clock is found but failed to enable
+ */
+static inline struct clk *coresight_get_enable_apb_pclk(struct device *dev)
+{
+	struct clk *pclk;
+	int ret;
+
+	pclk = clk_get(dev, "apb_pclk");
+	if (IS_ERR(pclk))
+		return NULL;
+
+	ret = clk_prepare_enable(pclk);
+	if (ret) {
+		clk_put(pclk);
+		return ERR_PTR(ret);
+	}
+	return pclk;
+}
+
+#define CORESIGHT_PIDRn(i)	(0xFE0 + ((i) * 4))
+
+static inline u32 coresight_get_pid(struct csdev_access *csa)
+{
+	u32 i, pid = 0;
+
+	for (i = 0; i < 4; i++)
+		pid |= csdev_access_relaxed_read32(csa, CORESIGHT_PIDRn(i)) << (i * 8);
+
+	return pid;
 }
 
 static inline u64 csdev_access_relaxed_read_pair(struct csdev_access *csa,