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authorAlexander Shishkin <alexander.shishkin@linux.intel.com>2017-08-23 09:59:55 +0300
committerAlexander Shishkin <alexander.shishkin@linux.intel.com>2018-03-28 18:47:23 +0300
commitebc57e399b8efb68293f206333985a3394c3acf8 (patch)
tree8a4a2cba6c6aeb166baeffb9bfd844b523487fd4 /drivers/hwtracing
parent282ffec565c2e9fe18bbb48c19767cccd2437f11 (diff)
downloadlinux-ebc57e399b8efb68293f206333985a3394c3acf8.tar.xz
intel_th: Add ACPI glue layer
The Trace Hub devices now can be enumerated as ACPI devices, which translates into "Host Debugger mode". There are two IDs: one for PCH Trace Hub, and one for the uncore Trace Hub. These are expected to stay the same across all platforms. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r--drivers/hwtracing/intel_th/Kconfig12
-rw-r--r--drivers/hwtracing/intel_th/Makefile3
-rw-r--r--drivers/hwtracing/intel_th/acpi.c79
3 files changed, 94 insertions, 0 deletions
diff --git a/drivers/hwtracing/intel_th/Kconfig b/drivers/hwtracing/intel_th/Kconfig
index 1b412f8a56b5..ca0527d588e9 100644
--- a/drivers/hwtracing/intel_th/Kconfig
+++ b/drivers/hwtracing/intel_th/Kconfig
@@ -25,6 +25,18 @@ config INTEL_TH_PCI
Say Y here to enable PCI Intel TH support.
+config INTEL_TH_ACPI
+ tristate "Intel(R) Trace Hub ACPI controller"
+ depends on ACPI
+ help
+ Intel(R) Trace Hub may exist as an ACPI device. This option enables
+ support glue layer for ACPI-based Intel TH. This typically implies
+ 'host debugger' mode, that is, the trace configuration and capture
+ is handled by an external debug host and corresponding controls will
+ not be available on the target.
+
+ Say Y here to enable ACPI Intel TH support.
+
config INTEL_TH_GTH
tristate "Intel(R) Trace Hub Global Trace Hub"
help
diff --git a/drivers/hwtracing/intel_th/Makefile b/drivers/hwtracing/intel_th/Makefile
index 880c9b5e8566..d9252fa8d9ca 100644
--- a/drivers/hwtracing/intel_th/Makefile
+++ b/drivers/hwtracing/intel_th/Makefile
@@ -6,6 +6,9 @@ intel_th-$(CONFIG_INTEL_TH_DEBUG) += debug.o
obj-$(CONFIG_INTEL_TH_PCI) += intel_th_pci.o
intel_th_pci-y := pci.o
+obj-$(CONFIG_INTEL_TH_ACPI) += intel_th_acpi.o
+intel_th_acpi-y := acpi.o
+
obj-$(CONFIG_INTEL_TH_GTH) += intel_th_gth.o
intel_th_gth-y := gth.o
diff --git a/drivers/hwtracing/intel_th/acpi.c b/drivers/hwtracing/intel_th/acpi.c
new file mode 100644
index 000000000000..87bc3744755f
--- /dev/null
+++ b/drivers/hwtracing/intel_th/acpi.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Intel(R) Trace Hub ACPI driver
+ *
+ * Copyright (C) 2017 Intel Corporation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/sysfs.h>
+#include <linux/platform_device.h>
+#include <linux/acpi.h>
+
+#include "intel_th.h"
+
+#define DRIVER_NAME "intel_th_acpi"
+
+static const struct intel_th_drvdata intel_th_acpi_pch = {
+ .host_mode_only = 1,
+};
+
+static const struct intel_th_drvdata intel_th_acpi_uncore = {
+ .host_mode_only = 1,
+};
+
+static const struct acpi_device_id intel_th_acpi_ids[] = {
+ { "INTC1000", (kernel_ulong_t)&intel_th_acpi_uncore },
+ { "INTC1001", (kernel_ulong_t)&intel_th_acpi_pch },
+ { "", 0 },
+};
+
+MODULE_DEVICE_TABLE(acpi, intel_th_acpi_ids);
+
+static int intel_th_acpi_probe(struct platform_device *pdev)
+{
+ struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
+ const struct acpi_device_id *id;
+ struct intel_th *th;
+
+ id = acpi_match_device(intel_th_acpi_ids, &pdev->dev);
+ if (!id)
+ return -ENODEV;
+
+ th = intel_th_alloc(&pdev->dev, (void *)id->driver_data,
+ pdev->resource, pdev->num_resources, -1);
+ if (IS_ERR(th))
+ return PTR_ERR(th);
+
+ adev->driver_data = th;
+
+ return 0;
+}
+
+static int intel_th_acpi_remove(struct platform_device *pdev)
+{
+ struct intel_th *th = platform_get_drvdata(pdev);
+
+ intel_th_free(th);
+
+ return 0;
+}
+
+static struct platform_driver intel_th_acpi_driver = {
+ .probe = intel_th_acpi_probe,
+ .remove = intel_th_acpi_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .acpi_match_table = intel_th_acpi_ids,
+ },
+};
+
+module_platform_driver(intel_th_acpi_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Intel(R) Trace Hub ACPI controller driver");
+MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@intel.com>");