platform/x86/intel/vsec: Add PMT read callbacks

Some PMT providers require device specific actions before their telemetry
can be read. Provide assignable PMT read callbacks to allow providers to
perform those actions.

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Link: https://lore.kernel.org/r/20240725122346.4063913-3-michael.j.ruhl@intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/include/linux/intel_vsec.h b/include/linux/intel_vsec.h
index 6495e37c9079..11ee185566c3 100644
--- a/include/linux/intel_vsec.h
+++ b/include/linux/intel_vsec.h
@@ -68,9 +68,23 @@ enum intel_vsec_quirks {
 };
 
 /**
+ * struct pmt_callbacks - Callback infrastructure for PMT devices
+ * ->read_telem() when specified, called by client driver to access PMT data (instead
+ * of direct copy).
+ * @pdev:  PCI device reference for the callback's use
+ * @guid:  ID of data to acccss
+ * @data:  buffer for the data to be copied
+ * @count: size of buffer
+ */
+struct pmt_callbacks {
+	int (*read_telem)(struct pci_dev *pdev, u32 guid, u64 *data, u32 count);
+};
+
+/**
  * struct intel_vsec_platform_info - Platform specific data
  * @parent:    parent device in the auxbus chain
  * @headers:   list of headers to define the PMT client devices to create
+ * @priv_data: private data, usable by parent devices, currently a callback
  * @caps:      bitmask of PMT capabilities for the given headers
  * @quirks:    bitmask of VSEC device quirks
  * @base_addr: allow a base address to be specified (rather than derived)
@@ -78,6 +92,7 @@ enum intel_vsec_quirks {
 struct intel_vsec_platform_info {
 	struct device *parent;
 	struct intel_vsec_header **headers;
+	void *priv_data;
 	unsigned long caps;
 	unsigned long quirks;
 	u64 base_addr;