From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: "David E. Box" <david.e.box@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
Andy Shevchenko <andy@infradead.org>,
Lee Jones <lee.jones@linaro.org>,
Alexander Duyck <alexander.h.duyck@linux.intel.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-pci@vger.kernel.org
Subject: Re: [PATCH v2 3/3] platform/x86: Intel PMT Telemetry capability driver
Date: Fri, 8 May 2020 12:57:52 +0300 [thread overview]
Message-ID: <CAHp75VcrjFUgUe6Vo8baT969cGzE4MFX6pFL1Vr5HOun=Cm0fA@mail.gmail.com> (raw)
In-Reply-To: <20200508021844.6911-4-david.e.box@linux.intel.com>
On Fri, May 8, 2020 at 5:18 AM David E. Box <david.e.box@linux.intel.com> wrote:
>
> PMT Telemetry is a capability of the Intel Platform Monitoring Technology.
> The Telemetry capability provides access to device telemetry metrics that
> provide hardware performance data to users from continuous, memory mapped,
> read-only register spaces.
>
> Register mappings are not provided by the driver. Instead, a GUID is read
> from a header for each endpoint. The GUID identifies the device and is to
> be used with an XML, provided by the vendor, to discover the available set
> of metrics and their register mapping. This allows firmware updates to
> modify the register space without needing to update the driver every time
> with new mappings. Firmware writes a new GUID in this case to specify the
> new mapping. Software tools with access to the associated XML file can
> then interpret the changes.
>
> This module manages access to all PMT Telemetry endpoints on a system,
> regardless of the device exporting them. It creates a pmt_telemetry class
> to manage the list. For each endpoint, sysfs files provide GUID and size
> information as well as a pointer to the parent device the telemetry comes
> from. Software may discover the association between endpoints and devices
> by iterating through the list in sysfs, or by looking for the existence of
ABI needs documentation.
> the class folder under the device of interest. A device node of the same
> name allows software to then map the telemetry space for direct access.
...
> +config INTEL_PMT_TELEM
TELEMETRY
...
> +obj-$(CONFIG_INTEL_PMT_TELEM) += intel_pmt_telem.o
telemetry
(Inside the file it's fine to have telem)
...
> + priv->dvsec = dev_get_platdata(&pdev->dev);
> + if (!priv->dvsec) {
> + dev_err(&pdev->dev, "Platform data not found\n");
> + return -ENODEV;
> + }
I don't see how is it being used?
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2020-05-08 9:58 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-05 1:32 [PATCH 0/3] Intel Platform Monitoring Technology David E. Box
2020-05-05 1:32 ` [PATCH 1/3] pci: Add Designated Vendor Specific Capability David E. Box
2020-05-05 8:49 ` Andy Shevchenko
2020-05-05 15:00 ` David E. Box
2020-05-05 16:34 ` Bjorn Helgaas
2020-05-05 2:31 ` [PATCH 2/3] mfd: Intel Platform Monitoring Technology support David E. Box
2020-05-05 2:31 ` [PATCH 3/3] platform/x86: Intel PMT Telemetry capability driver David E. Box
2020-05-05 13:49 ` Andy Shevchenko
2020-05-05 21:09 ` David E. Box
2020-05-08 2:33 ` David E. Box
2020-05-05 2:53 ` [PATCH 2/3] mfd: Intel Platform Monitoring Technology support Randy Dunlap
2020-05-05 14:55 ` David E. Box
2020-05-05 9:02 ` Andy Shevchenko
2020-05-05 15:15 ` David E. Box
2020-05-08 2:18 ` [PATCH v2 0/3] Intel Platform Monitoring Technology David E. Box
2020-05-08 9:59 ` Andy Shevchenko
2020-07-14 6:23 ` [PATCH V3 " David E. Box
2020-07-17 19:06 ` [PATCH V4 " David E. Box
2020-07-27 10:23 ` Andy Shevchenko
2020-07-27 16:29 ` David E. Box
2020-07-29 21:37 ` [PATCH V5 " David E. Box
2020-08-10 14:15 ` David E. Box
2020-08-10 14:42 ` Umesh A
2020-08-11 8:04 ` Lee Jones
2020-08-11 14:50 ` David E. Box
2020-07-29 21:37 ` [PATCH V5 1/3] PCI: Add defines for Designated Vendor-Specific Extended Capability David E. Box
2020-07-29 21:37 ` [PATCH V5 2/3] mfd: Intel Platform Monitoring Technology support David E. Box
2020-07-29 21:37 ` [PATCH V5 3/3] platform/x86: Intel PMT Telemetry capability driver David E. Box
2020-07-17 19:06 ` [PATCH V4 1/3] PCI: Add defines for Designated Vendor-Specific Extended Capability David E. Box
2020-07-17 20:11 ` Andy Shevchenko
2020-07-17 19:06 ` [PATCH V4 2/3] mfd: Intel Platform Monitoring Technology support David E. Box
2020-07-28 7:58 ` Lee Jones
2020-07-28 20:35 ` David E. Box
2020-07-29 22:59 ` Mark D Rustad
2020-07-30 17:53 ` David E. Box
2020-07-31 6:19 ` Lee Jones
2020-07-17 19:06 ` [PATCH V4 3/3] platform/x86: Intel PMT Telemetry capability driver David E. Box
2020-07-14 6:23 ` [PATCH V3 1/3] PCI: Add defines for Designated Vendor-Specific Capability David E. Box
2020-07-14 8:40 ` Andy Shevchenko
2020-07-16 2:55 ` Randy Dunlap
2020-07-16 15:07 ` Bjorn Helgaas
2020-07-16 15:07 ` Randy Dunlap
2020-07-16 17:18 ` Alexander Duyck
2020-07-16 18:31 ` David E. Box
2020-07-14 6:23 ` [PATCH V3 2/3] mfd: Intel Platform Monitoring Technology support David E. Box
2020-07-15 5:09 ` kernel test robot
2020-07-14 6:23 ` [PATCH V3 3/3] platform/x86: Intel PMT Telemetry capability driver David E. Box
2020-07-14 8:51 ` Andy Shevchenko
2020-07-15 7:39 ` Alexey Budankov
2020-07-15 23:59 ` David E. Box
2020-07-16 5:57 ` Alexey Budankov
2020-07-16 2:57 ` Randy Dunlap
2020-05-08 2:18 ` [PATCH v2 1/3] PCI: Add defines for Designated Vendor-Specific Capability David E. Box
2020-05-08 2:18 ` [PATCH v2 2/3] mfd: Intel Platform Monitoring Technology support David E. Box
2020-05-08 9:15 ` Andy Shevchenko
2020-05-08 2:18 ` [PATCH v2 3/3] platform/x86: Intel PMT Telemetry capability driver David E. Box
2020-05-08 9:57 ` Andy Shevchenko [this message]
2020-05-09 16:27 ` David E. Box
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