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SubjectRe: [PATCH v5 3/3] platform/x86: intel_pmc_core: Instantiate pmc_core device on legacy platforms
On Thu, Apr 11, 2019 at 3:38 AM Rajat Jain <rajatja@google.com> wrote:
>
> Add code to instantiate the pmc_core platform device and thus attach to
> the driver, if the ACPI device for the same ("INT33A1") is not present
> in a system where it should be. This was discussed here:
> https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1966991.html
>
> Signed-off-by: Rajat Jain <rajatja@google.com>
> ---
> v5: Remove the gerrit id from commit log
> v4: Rename file, remove dummy arg, 1 conditional per if statement,
> simplify init / exit calls..
> v3: (first version of *this* patch -to go with rest of v3 patchset)
> v2: (does not exist)
> v1: (does not exist)
>
> drivers/platform/x86/Makefile | 2 +-
> .../platform/x86/intel_pmc_core_plat_drv.c | 60 +++++++++++++++++++
> 2 files changed, 61 insertions(+), 1 deletion(-)
> create mode 100644 drivers/platform/x86/intel_pmc_core_plat_drv.c
>
> diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
> index 86cb76677bc8..7041a88c34c7 100644
> --- a/drivers/platform/x86/Makefile
> +++ b/drivers/platform/x86/Makefile
> @@ -89,7 +89,7 @@ obj-$(CONFIG_INTEL_BXTWC_PMIC_TMU) += intel_bxtwc_tmu.o
> obj-$(CONFIG_INTEL_TELEMETRY) += intel_telemetry_core.o \
> intel_telemetry_pltdrv.o \
> intel_telemetry_debugfs.o
> -obj-$(CONFIG_INTEL_PMC_CORE) += intel_pmc_core.o
> +obj-$(CONFIG_INTEL_PMC_CORE) += intel_pmc_core.o intel_pmc_core_plat_drv.o
> obj-$(CONFIG_PMC_ATOM) += pmc_atom.o
> obj-$(CONFIG_MLX_PLATFORM) += mlx-platform.o
> obj-$(CONFIG_INTEL_TURBO_MAX_3) += intel_turbo_max_3.o
> diff --git a/drivers/platform/x86/intel_pmc_core_plat_drv.c b/drivers/platform/x86/intel_pmc_core_plat_drv.c
> new file mode 100644
> index 000000000000..7f5af5bd7f1f
> --- /dev/null
> +++ b/drivers/platform/x86/intel_pmc_core_plat_drv.c
> @@ -0,0 +1,60 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/*
> + * Intel PMC Core platform init
> + * Copyright (c) 2019, Google Inc.
> + * Author - Rajat Jain
> + *
> + * This code instantiates platform devices for intel_pmc_core driver, only
> + * on supported platforms that may not have the ACPI devices in the ACPI tables.
> + * No new platforms should be added here, because we expect that new platforms
> + * should all have the ACPI device, which is the preferred way of enumeration.
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/platform_device.h>
> +
> +#include <asm/cpu_device_id.h>
> +#include <asm/intel-family.h>
> +
> +static struct platform_device pmc_core_device = {
> + .name = "pmc_core",

This name is too generic. Better to use the current module name, i.e.
"intel_pmc_core".

However, see my comment to the first patch in the series.

> +};
> +
> +/*
> + * intel_pmc_core_platform_ids is the list of platforms where we want to
> + * instantiate the platform_device if not already instantiated. This is
> + * different than intel_pmc_core_ids in intel_pmc_core.c which is the
> + * list of platforms that the driver supports for pmc_core device. The
> + * other list may grow, but this list should not.
> + */
> +static const struct x86_cpu_id intel_pmc_core_platform_ids[] = {
> + INTEL_CPU_FAM6(SKYLAKE_MOBILE, pmc_core_device),
> + INTEL_CPU_FAM6(SKYLAKE_DESKTOP, pmc_core_device),
> + INTEL_CPU_FAM6(KABYLAKE_MOBILE, pmc_core_device),
> + INTEL_CPU_FAM6(KABYLAKE_DESKTOP, pmc_core_device),
> + INTEL_CPU_FAM6(CANNONLAKE_MOBILE, pmc_core_device),
> + INTEL_CPU_FAM6(ICELAKE_MOBILE, pmc_core_device),
> + {}
> +};
> +MODULE_DEVICE_TABLE(x86cpu, intel_pmc_core_platform_ids);
> +
> +static int __init pmc_core_platform_init(void)
> +{
> + /* Skip creating the platform device if ACPI already has a device */
> + if (acpi_dev_present("INT33A1", NULL, -1))
> + return -ENODEV;
> +
> + if (!x86_match_cpu(intel_pmc_core_platform_ids))
> + return -ENODEV;
> +
> + return platform_device_register(&pmc_core_device);
> +}
> +
> +static void __exit pmc_core_platform_exit(void)
> +{
> + platform_device_unregister(&pmc_core_device);
> +}
> +
> +module_init(pmc_core_platform_init);
> +module_exit(pmc_core_platform_exit);
> --
> 2.21.0.392.gf8f6787159e-goog
>


--
With Best Regards,
Andy Shevchenko

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