linux-kernel - Re: [PATCH V3 11/16] platform/x86/intel/pmc: Find and register PMC telemetry entries

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Date:   Thu, 12 Oct 2023 18:17:52 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     "David E. Box" <david.e.box@...ux.intel.com>
cc:     LKML <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org, rajvi.jingar@...ux.intel.com
Subject: Re: [PATCH V3 11/16] platform/x86/intel/pmc: Find and register PMC
 telemetry entries

On Wed, 11 Oct 2023, David E. Box wrote:

> The PMC SSRAM device contains counters that are structured in Intel
> Platform Monitoring Technology (PMT) telemetry regions. Look for and
> register these telemetry regions from the driver so that they may be read
> using the Intel PMT ABI.
> 
> Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
> ---
> V3 - no change
> 
> V2 - no change
> 
>  drivers/platform/x86/intel/pmc/Kconfig      |  1 +
>  drivers/platform/x86/intel/pmc/core_ssram.c | 52 +++++++++++++++++++++
>  2 files changed, 53 insertions(+)
> 
> diff --git a/drivers/platform/x86/intel/pmc/Kconfig b/drivers/platform/x86/intel/pmc/Kconfig
> index b526597e4deb..d2f651fbec2c 100644
> --- a/drivers/platform/x86/intel/pmc/Kconfig
> +++ b/drivers/platform/x86/intel/pmc/Kconfig
> @@ -7,6 +7,7 @@ config INTEL_PMC_CORE
>  	tristate "Intel PMC Core driver"
>  	depends on PCI
>  	depends on ACPI
> +	depends on INTEL_PMT_TELEMETRY
>  	help
>  	  The Intel Platform Controller Hub for Intel Core SoCs provides access
>  	  to Power Management Controller registers via various interfaces. This
> diff --git a/drivers/platform/x86/intel/pmc/core_ssram.c b/drivers/platform/x86/intel/pmc/core_ssram.c
> index af405d11919f..1ecfa3804117 100644
> --- a/drivers/platform/x86/intel/pmc/core_ssram.c
> +++ b/drivers/platform/x86/intel/pmc/core_ssram.c
> @@ -13,6 +13,8 @@
>  #include <linux/io-64-nonatomic-lo-hi.h>
>  
>  #include "core.h"
> +#include "../vsec.h"
> +#include "../pmt/telemetry.h"
>  
>  #define SSRAM_HDR_SIZE		0x100
>  #define SSRAM_PWRM_OFFSET	0x14
> @@ -24,6 +26,49 @@
>  
>  DEFINE_FREE(pmc_core_iounmap, void __iomem *, iounmap(_T));
>  
> +static void
> +pmc_add_pmt(struct pmc_dev *pmcdev, u64 ssram_base, void __iomem *ssram)
> +{
> +	struct pci_dev *pcidev = pmcdev->ssram_pcidev;
> +	struct intel_vsec_platform_info info = {};
> +	struct intel_vsec_header *headers[2] = {};
> +	struct intel_vsec_header header;
> +	void __iomem *dvsec;
> +	u32 dvsec_offset;
> +	u32 table, hdr;
> +
> +	ssram = ioremap(ssram_base, SSRAM_HDR_SIZE);
> +	if (!ssram)
> +		return;
> +
> +	dvsec_offset = readl(ssram + SSRAM_DVSEC_OFFSET);
> +	iounmap(ssram);
> +
> +	dvsec = ioremap(ssram_base + dvsec_offset, SSRAM_DVSEC_SIZE);
> +	if (!dvsec)
> +		return;
> +
> +	hdr = readl(dvsec + PCI_DVSEC_HEADER1);
> +	header.id = readw(dvsec + PCI_DVSEC_HEADER2);
> +	header.rev = PCI_DVSEC_HEADER1_REV(hdr);
> +	header.length = PCI_DVSEC_HEADER1_LEN(hdr);
> +	header.num_entries = readb(dvsec + INTEL_DVSEC_ENTRIES);
> +	header.entry_size = readb(dvsec + INTEL_DVSEC_SIZE);
> +
> +	table = readl(dvsec + INTEL_DVSEC_TABLE);
> +	header.tbir = INTEL_DVSEC_TABLE_BAR(table);
> +	header.offset = INTEL_DVSEC_TABLE_OFFSET(table);
> +	iounmap(dvsec);
> +
> +	headers[0] = &header;
> +	info.caps = VSEC_CAP_TELEMETRY;
> +	info.headers = headers;
> +	info.base_addr = ssram_base;
> +	info.parent = &pmcdev->pdev->dev;
> +
> +	intel_vsec_register(pcidev, &info);
> +}
> +
>  static const struct pmc_reg_map *pmc_core_find_regmap(struct pmc_info *list, u16 devid)
>  {
>  	for (; list->map; ++list)
> @@ -98,6 +143,9 @@ pmc_core_get_secondary_pmc(struct pmc_dev *pmcdev, int pmc_idx, u32 offset)
>  	pwrm_base = get_base(secondary_ssram, SSRAM_PWRM_OFFSET);
>  	devid = readw(secondary_ssram + SSRAM_DEVID_OFFSET);
>  
> +	/* Find and register and PMC telemetry entries */
> +	pmc_add_pmt(pmcdev, ssram_base, main_ssram);
> +
>  	map = pmc_core_find_regmap(pmcdev->regmap_list, devid);
>  	if (!map)
>  		return -ENODEV;
> @@ -126,6 +174,9 @@ pmc_core_get_primary_pmc(struct pmc_dev *pmcdev)
>  	pwrm_base = get_base(ssram, SSRAM_PWRM_OFFSET);
>  	devid = readw(ssram + SSRAM_DEVID_OFFSET);
>  
> +	/* Find and register and PMC telemetry entries */
> +	pmc_add_pmt(pmcdev, ssram_base, ssram);
> +
>  	map = pmc_core_find_regmap(pmcdev->regmap_list, devid);
>  	if (!map)
>  		return -ENODEV;
> @@ -165,3 +216,4 @@ int pmc_core_ssram_init(struct pmc_dev *pmcdev)
>  
>  	return ret;
>  }
> +MODULE_IMPORT_NS(INTEL_VSEC);

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

-- 
 i.