[PATCH V5 00/20] intel_pmc: Add telemetry API to read counters

[PATCH V5 00/20] intel_pmc: Add telemetry API to read counters

[David E. Box]

On newer Intel silicon, more IP counters are being added in Intel Platform
Monitoring Technology (PMT) telemetry spaces hosted in MMIO.  There is a
need for the intel_pmc_core driver and other drivers to access PMT hosted
telemetry in the kernel using an API. This patchset adds driver APIs to
allow registering and reading telemetry entries. It makes changes to the
intel_pmc_core driver to use these interfaces to access the low power mode
counters that are now exclusively available from PMT.

David E. Box (15):
  platform/x86/intel/vsec: Fix xa_alloc memory leak
  platform/x86/intel/vsec: Move structures to header
  platform/x86/intel/vsec: remove platform_info from vsec device
    structure
  platform/x86/intel/vsec: Use cleanup.h
  platform/x86/intel/vsec: Assign auxdev parent by argument
  platform/x86/intel/vsec: Add base address field
  platform/x86/intel/pmt: Add header to struct intel_pmt_entry
  platform/x86/intel/pmt: telemetry: Export API to read telemetry
  platform/x86/intel/pmc: Allow pmc_core_ssram_init to fail
  asm-generic/io.h: iounmap/ioport_unmap cleanup.h support
  platform/x86/intel/pmc: Cleanup SSRAM discovery
  platform/x86/intel/pmc/mtl: Use return value from
    pmc_core_ssram_init()
  platform/x86/intel/pmc: Find and register PMC telemetry entries
  platform/x86/intel/pmc: Add debug attribute for Die C6 counter
  platform/x86/intel/pmc: Show Die C6 counter on Meteor Lake

Gayatri Kammela (1):
  platform/x86/intel/vsec: Add intel_vsec_register

Rajvi Jingar (1):
  platform/x86/intel/pmc: Display LPM requirements for multiple PMCs

Xi Pardee (3):
  platform/x86:intel/pmc: Call pmc_get_low_power_modes from platform
    init
  platform/x86/intel/pmc: Retrieve LPM information using Intel PMT
  platform/x86/intel/pmc: Read low power mode requirements for MTL-M and
    MTL-P

 drivers/platform/x86/intel/pmc/Kconfig      |   1 +
 drivers/platform/x86/intel/pmc/adl.c        |   2 +
 drivers/platform/x86/intel/pmc/cnp.c        |   2 +
 drivers/platform/x86/intel/pmc/core.c       | 190 +++++++++-----
 drivers/platform/x86/intel/pmc/core.h       |  10 +-
 drivers/platform/x86/intel/pmc/core_ssram.c | 263 +++++++++++++++++---
 drivers/platform/x86/intel/pmc/icl.c        |  10 +-
 drivers/platform/x86/intel/pmc/mtl.c        |  87 ++++++-
 drivers/platform/x86/intel/pmc/spt.c        |  10 +-
 drivers/platform/x86/intel/pmc/tgl.c        |   1 +
 drivers/platform/x86/intel/pmt/class.c      |  43 +++-
 drivers/platform/x86/intel/pmt/class.h      |  30 ++-
 drivers/platform/x86/intel/pmt/crashlog.c   |   2 +-
 drivers/platform/x86/intel/pmt/telemetry.c  | 193 +++++++++++++-
 drivers/platform/x86/intel/pmt/telemetry.h  | 126 ++++++++++
 drivers/platform/x86/intel/vsec.c           | 129 +++++-----
 drivers/platform/x86/intel/vsec.h           |  45 +++-
 include/asm-generic/io.h                    |   6 +
 18 files changed, 946 insertions(+), 204 deletions(-)
 create mode 100644 drivers/platform/x86/intel/pmt/telemetry.h


base-commit: b85ea95d086471afb4ad062012a4d73cd328fa86
-- 
2.34.1

[PATCH V5 01/20] platform/x86/intel/vsec: Fix xa_alloc memory leak

[David E. Box]

Fixes memory leak, caught be kmemleak, due to failure to erase auxiliary
device entries from an xarray on removal.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
---
V5 - New patch

 drivers/platform/x86/intel/vsec.c | 24 ++++++++++++++++--------
 drivers/platform/x86/intel/vsec.h |  1 +
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
index c1f9e4471b28..ae811bb65910 100644
--- a/drivers/platform/x86/intel/vsec.c
+++ b/drivers/platform/x86/intel/vsec.c
@@ -120,6 +120,8 @@ static void intel_vsec_dev_release(struct device *dev)
 {
 	struct intel_vsec_device *intel_vsec_dev = dev_to_ivdev(dev);
 
+	xa_erase(&auxdev_array, intel_vsec_dev->id);
+
 	mutex_lock(&vsec_ida_lock);
 	ida_free(intel_vsec_dev->ida, intel_vsec_dev->auxdev.id);
 	mutex_unlock(&vsec_ida_lock);
@@ -136,9 +138,21 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
 	int ret, id;
 
 	mutex_lock(&vsec_ida_lock);
-	ret = ida_alloc(intel_vsec_dev->ida, GFP_KERNEL);
+	id = ida_alloc(intel_vsec_dev->ida, GFP_KERNEL);
 	mutex_unlock(&vsec_ida_lock);
+	if (id < 0) {
+		kfree(intel_vsec_dev->resource);
+		kfree(intel_vsec_dev);
+		return ret;
+	}
+
+	ret = xa_alloc(&auxdev_array, &intel_vsec_dev->id, intel_vsec_dev,
+		       PMT_XA_LIMIT, GFP_KERNEL);
 	if (ret < 0) {
+		mutex_lock(&vsec_ida_lock);
+		ida_free(intel_vsec_dev->ida, id);
+		mutex_unlock(&vsec_ida_lock);
+
 		kfree(intel_vsec_dev->resource);
 		kfree(intel_vsec_dev);
 		return ret;
@@ -147,7 +161,7 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
 	if (!parent)
 		parent = &pdev->dev;
 
-	auxdev->id = ret;
+	auxdev->id = id;
 	auxdev->name = name;
 	auxdev->dev.parent = parent;
 	auxdev->dev.release = intel_vsec_dev_release;
@@ -169,12 +183,6 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
 	if (ret < 0)
 		return ret;
 
-	/* Add auxdev to list */
-	ret = xa_alloc(&auxdev_array, &id, intel_vsec_dev, PMT_XA_LIMIT,
-		       GFP_KERNEL);
-	if (ret)
-		return ret;
-
 	return 0;
 }
 EXPORT_SYMBOL_NS_GPL(intel_vsec_add_aux, INTEL_VSEC);
diff --git a/drivers/platform/x86/intel/vsec.h b/drivers/platform/x86/intel/vsec.h
index 0fd042c171ba..0a6201b4a0e9 100644
--- a/drivers/platform/x86/intel/vsec.h
+++ b/drivers/platform/x86/intel/vsec.h
@@ -45,6 +45,7 @@ struct intel_vsec_device {
 	struct ida *ida;
 	struct intel_vsec_platform_info *info;
 	int num_resources;
+	int id; /* xa */
 	void *priv_data;
 	size_t priv_data_size;
 };
-- 
2.34.1

[PATCH V5 02/20] platform/x86/intel/vsec: Move structures to header

[David E. Box]

In preparation for exporting an API to register Intel Vendor Specific
Extended Capabilities (VSEC) from other drivers, move needed structures to
the header file.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
V5 - No change

V4 - No change

V3 - No change

V2 - New patch splitting previous PATCH 1

 drivers/platform/x86/intel/vsec.c | 35 ------------------------------
 drivers/platform/x86/intel/vsec.h | 36 +++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+), 35 deletions(-)

diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
index ae811bb65910..6bb233a23414 100644
--- a/drivers/platform/x86/intel/vsec.c
+++ b/drivers/platform/x86/intel/vsec.c
@@ -24,13 +24,6 @@
 
 #include "vsec.h"
 
-/* Intel DVSEC offsets */
-#define INTEL_DVSEC_ENTRIES		0xA
-#define INTEL_DVSEC_SIZE		0xB
-#define INTEL_DVSEC_TABLE		0xC
-#define INTEL_DVSEC_TABLE_BAR(x)	((x) & GENMASK(2, 0))
-#define INTEL_DVSEC_TABLE_OFFSET(x)	((x) & GENMASK(31, 3))
-#define TABLE_OFFSET_SHIFT		3
 #define PMT_XA_START			0
 #define PMT_XA_MAX			INT_MAX
 #define PMT_XA_LIMIT			XA_LIMIT(PMT_XA_START, PMT_XA_MAX)
@@ -39,34 +32,6 @@ static DEFINE_IDA(intel_vsec_ida);
 static DEFINE_IDA(intel_vsec_sdsi_ida);
 static DEFINE_XARRAY_ALLOC(auxdev_array);
 
-/**
- * struct intel_vsec_header - Common fields of Intel VSEC and DVSEC registers.
- * @rev:         Revision ID of the VSEC/DVSEC register space
- * @length:      Length of the VSEC/DVSEC register space
- * @id:          ID of the feature
- * @num_entries: Number of instances of the feature
- * @entry_size:  Size of the discovery table for each feature
- * @tbir:        BAR containing the discovery tables
- * @offset:      BAR offset of start of the first discovery table
- */
-struct intel_vsec_header {
-	u8	rev;
-	u16	length;
-	u16	id;
-	u8	num_entries;
-	u8	entry_size;
-	u8	tbir;
-	u32	offset;
-};
-
-enum intel_vsec_id {
-	VSEC_ID_TELEMETRY	= 2,
-	VSEC_ID_WATCHER		= 3,
-	VSEC_ID_CRASHLOG	= 4,
-	VSEC_ID_SDSI		= 65,
-	VSEC_ID_TPMI		= 66,
-};
-
 static const char *intel_vsec_name(enum intel_vsec_id id)
 {
 	switch (id) {
diff --git a/drivers/platform/x86/intel/vsec.h b/drivers/platform/x86/intel/vsec.h
index 0a6201b4a0e9..c242c07ea69c 100644
--- a/drivers/platform/x86/intel/vsec.h
+++ b/drivers/platform/x86/intel/vsec.h
@@ -11,9 +11,45 @@
 #define VSEC_CAP_SDSI		BIT(3)
 #define VSEC_CAP_TPMI		BIT(4)
 
+/* Intel DVSEC offsets */
+#define INTEL_DVSEC_ENTRIES		0xA
+#define INTEL_DVSEC_SIZE		0xB
+#define INTEL_DVSEC_TABLE		0xC
+#define INTEL_DVSEC_TABLE_BAR(x)	((x) & GENMASK(2, 0))
+#define INTEL_DVSEC_TABLE_OFFSET(x)	((x) & GENMASK(31, 3))
+#define TABLE_OFFSET_SHIFT		3
+
 struct pci_dev;
 struct resource;
 
+enum intel_vsec_id {
+	VSEC_ID_TELEMETRY	= 2,
+	VSEC_ID_WATCHER		= 3,
+	VSEC_ID_CRASHLOG	= 4,
+	VSEC_ID_SDSI		= 65,
+	VSEC_ID_TPMI		= 66,
+};
+
+/**
+ * struct intel_vsec_header - Common fields of Intel VSEC and DVSEC registers.
+ * @rev:         Revision ID of the VSEC/DVSEC register space
+ * @length:      Length of the VSEC/DVSEC register space
+ * @id:          ID of the feature
+ * @num_entries: Number of instances of the feature
+ * @entry_size:  Size of the discovery table for each feature
+ * @tbir:        BAR containing the discovery tables
+ * @offset:      BAR offset of start of the first discovery table
+ */
+struct intel_vsec_header {
+	u8	rev;
+	u16	length;
+	u16	id;
+	u8	num_entries;
+	u8	entry_size;
+	u8	tbir;
+	u32	offset;
+};
+
 enum intel_vsec_quirks {
 	/* Watcher feature not supported */
 	VSEC_QUIRK_NO_WATCHER	= BIT(0),
-- 
2.34.1

[PATCH V5 03/20] platform/x86/intel/vsec: remove platform_info from vsec device structure

[David E. Box]

In preparation for exporting an API to register Intel Vendor Specific
Extended Capabilities (VSEC) from other drivers, remove the pointer to
platform_info from intel_vsec_device. This prevents a potential page fault
when auxiliary drivers probe and attempt to dereference this pointer to
access the needed quirks field. Instead, just add the quirks to
intel_vsec_device.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
V5 - No change

V4 - No change

V3 - No change

V2 - New patch splitting previous PATCH 1

 drivers/platform/x86/intel/pmt/class.c | 2 +-
 drivers/platform/x86/intel/vsec.c      | 2 +-
 drivers/platform/x86/intel/vsec.h      | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/intel/pmt/class.c b/drivers/platform/x86/intel/pmt/class.c
index f32a233470de..2ad91d2fd954 100644
--- a/drivers/platform/x86/intel/pmt/class.c
+++ b/drivers/platform/x86/intel/pmt/class.c
@@ -31,7 +31,7 @@ bool intel_pmt_is_early_client_hw(struct device *dev)
 	 * differences from the server platforms (which use the Out Of Band
 	 * Management Services Module OOBMSM).
 	 */
-	return !!(ivdev->info->quirks & VSEC_QUIRK_EARLY_HW);
+	return !!(ivdev->quirks & VSEC_QUIRK_EARLY_HW);
 }
 EXPORT_SYMBOL_NS_GPL(intel_pmt_is_early_client_hw, INTEL_PMT);
 
diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
index 6bb233a23414..15866b7d3117 100644
--- a/drivers/platform/x86/intel/vsec.c
+++ b/drivers/platform/x86/intel/vsec.c
@@ -201,7 +201,7 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
 	intel_vsec_dev->pcidev = pdev;
 	intel_vsec_dev->resource = res;
 	intel_vsec_dev->num_resources = header->num_entries;
-	intel_vsec_dev->info = info;
+	intel_vsec_dev->quirks = info->quirks;
 
 	if (header->id == VSEC_ID_SDSI)
 		intel_vsec_dev->ida = &intel_vsec_sdsi_ida;
diff --git a/drivers/platform/x86/intel/vsec.h b/drivers/platform/x86/intel/vsec.h
index c242c07ea69c..8b9fad170503 100644
--- a/drivers/platform/x86/intel/vsec.h
+++ b/drivers/platform/x86/intel/vsec.h
@@ -79,11 +79,11 @@ struct intel_vsec_device {
 	struct pci_dev *pcidev;
 	struct resource *resource;
 	struct ida *ida;
-	struct intel_vsec_platform_info *info;
 	int num_resources;
 	int id; /* xa */
 	void *priv_data;
 	size_t priv_data_size;
+	unsigned long quirks;
 };
 
 int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
-- 
2.34.1

[PATCH V5 04/20] platform/x86/intel/vsec: Use cleanup.h

[David E. Box]

Use cleanup.h helpers to handle cleanup of resources in
intel_vsec_add_dev() after failures.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
V5 - Assign no_free_ptr(res) to resource member. This fixes __must_check_fn
     warning.
   - Remove unsed ret variable.

V4 - Do no_free_ptr() before and in call to intel_vsec_add_aux().
   - Add resource cleanup in this patch.

V3 - New patch.

 drivers/platform/x86/intel/vsec.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
index 15866b7d3117..7dc3650f2757 100644
--- a/drivers/platform/x86/intel/vsec.c
+++ b/drivers/platform/x86/intel/vsec.c
@@ -15,6 +15,7 @@
 
 #include <linux/auxiliary_bus.h>
 #include <linux/bits.h>
+#include <linux/cleanup.h>
 #include <linux/delay.h>
 #include <linux/kernel.h>
 #include <linux/idr.h>
@@ -155,8 +156,9 @@ EXPORT_SYMBOL_NS_GPL(intel_vsec_add_aux, INTEL_VSEC);
 static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *header,
 			      struct intel_vsec_platform_info *info)
 {
-	struct intel_vsec_device *intel_vsec_dev;
-	struct resource *res, *tmp;
+	struct intel_vsec_device __free(kfree) *intel_vsec_dev = NULL;
+	struct resource __free(kfree) *res = NULL;
+	struct resource *tmp;
 	unsigned long quirks = info->quirks;
 	int i;
 
@@ -178,10 +180,8 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
 		return -ENOMEM;
 
 	res = kcalloc(header->num_entries, sizeof(*res), GFP_KERNEL);
-	if (!res) {
-		kfree(intel_vsec_dev);
+	if (!res)
 		return -ENOMEM;
-	}
 
 	if (quirks & VSEC_QUIRK_TABLE_SHIFT)
 		header->offset >>= TABLE_OFFSET_SHIFT;
@@ -199,7 +199,7 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
 	}
 
 	intel_vsec_dev->pcidev = pdev;
-	intel_vsec_dev->resource = res;
+	intel_vsec_dev->resource = no_free_ptr(res);
 	intel_vsec_dev->num_resources = header->num_entries;
 	intel_vsec_dev->quirks = info->quirks;
 
@@ -208,7 +208,11 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
 	else
 		intel_vsec_dev->ida = &intel_vsec_ida;
 
-	return intel_vsec_add_aux(pdev, NULL, intel_vsec_dev,
+	/*
+	 * Pass the ownership of intel_vsec_dev and resource within it to
+	 * intel_vsec_add_aux()
+	 */
+	return intel_vsec_add_aux(pdev, NULL, no_free_ptr(intel_vsec_dev),
 				  intel_vsec_name(header->id));
 }
 
-- 
2.34.1

[PATCH V5 05/20] platform/x86/intel/vsec: Assign auxdev parent by argument

[David E. Box]

Instead of checking for a NULL parent argument in intel_vsec_add_aux() and
then assigning it to the probed device, remove this check and just pass the
device in the call. Since this function is exported, return -EINVAL if the
parent is not specified.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
---
V5 - New patch

 drivers/platform/x86/intel/vsec.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
index 7dc3650f2757..7a717183c58b 100644
--- a/drivers/platform/x86/intel/vsec.c
+++ b/drivers/platform/x86/intel/vsec.c
@@ -103,6 +103,9 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
 	struct auxiliary_device *auxdev = &intel_vsec_dev->auxdev;
 	int ret, id;
 
+	if (!parent)
+		return -EINVAL;
+
 	mutex_lock(&vsec_ida_lock);
 	id = ida_alloc(intel_vsec_dev->ida, GFP_KERNEL);
 	mutex_unlock(&vsec_ida_lock);
@@ -124,9 +127,6 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
 		return ret;
 	}
 
-	if (!parent)
-		parent = &pdev->dev;
-
 	auxdev->id = id;
 	auxdev->name = name;
 	auxdev->dev.parent = parent;
@@ -212,7 +212,7 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
 	 * Pass the ownership of intel_vsec_dev and resource within it to
 	 * intel_vsec_add_aux()
 	 */
-	return intel_vsec_add_aux(pdev, NULL, no_free_ptr(intel_vsec_dev),
+	return intel_vsec_add_aux(pdev, &pdev->dev, no_free_ptr(intel_vsec_dev),
 				  intel_vsec_name(header->id));
 }
 
-- 
2.34.1

[PATCH V5 06/20] platform/x86/intel/vsec: Add intel_vsec_register

[David E. Box]

From: Gayatri Kammela <gayatri.kammela@linux.intel.com>

Add and export intel_vsec_register() to allow the registration of Intel
extended capabilities from other drivers. Add check to look for memory
conflicts before registering a new capability. Add a parent field to
intel_vsec_platform_info to allow specifying the parent device for
device managed cleanup.

Signed-off-by: Gayatri Kammela <gayatri.kammela@linux.intel.com>
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
---
V5 - Add parent variable in intel_vsec_add_dev() and set parent to
     the pci device if info->parent is not set.

V4 - Move res cleanup to previous patch

V3 - Replace kfree on request_mem_region fail with use of cleanup.h helper.

V2 - New patch splitting previous PATCH 1

 drivers/platform/x86/intel/vsec.c | 24 +++++++++++++++++++++++-
 drivers/platform/x86/intel/vsec.h |  4 ++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
index 7a717183c58b..03eabb7d3d3d 100644
--- a/drivers/platform/x86/intel/vsec.c
+++ b/drivers/platform/x86/intel/vsec.c
@@ -159,9 +159,15 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
 	struct intel_vsec_device __free(kfree) *intel_vsec_dev = NULL;
 	struct resource __free(kfree) *res = NULL;
 	struct resource *tmp;
+	struct device *parent;
 	unsigned long quirks = info->quirks;
 	int i;
 
+	if (info->parent)
+		parent = info->parent;
+	else
+		parent = &pdev->dev;
+
 	if (!intel_vsec_supported(header->id, info->caps))
 		return -EINVAL;
 
@@ -196,6 +202,12 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
 			     header->offset + i * (header->entry_size * sizeof(u32));
 		tmp->end = tmp->start + (header->entry_size * sizeof(u32)) - 1;
 		tmp->flags = IORESOURCE_MEM;
+
+		/* Check resource is not in use */
+		if (!request_mem_region(tmp->start, resource_size(tmp), ""))
+			return -EBUSY;
+
+		release_mem_region(tmp->start, resource_size(tmp));
 	}
 
 	intel_vsec_dev->pcidev = pdev;
@@ -212,7 +224,7 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
 	 * Pass the ownership of intel_vsec_dev and resource within it to
 	 * intel_vsec_add_aux()
 	 */
-	return intel_vsec_add_aux(pdev, &pdev->dev, no_free_ptr(intel_vsec_dev),
+	return intel_vsec_add_aux(pdev, parent, no_free_ptr(intel_vsec_dev),
 				  intel_vsec_name(header->id));
 }
 
@@ -330,6 +342,16 @@ static bool intel_vsec_walk_vsec(struct pci_dev *pdev,
 	return have_devices;
 }
 
+void intel_vsec_register(struct pci_dev *pdev,
+			 struct intel_vsec_platform_info *info)
+{
+	if (!pdev || !info)
+		return;
+
+	intel_vsec_walk_header(pdev, info);
+}
+EXPORT_SYMBOL_NS_GPL(intel_vsec_register, INTEL_VSEC);
+
 static int intel_vsec_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct intel_vsec_platform_info *info;
diff --git a/drivers/platform/x86/intel/vsec.h b/drivers/platform/x86/intel/vsec.h
index 8b9fad170503..bb8b6452df70 100644
--- a/drivers/platform/x86/intel/vsec.h
+++ b/drivers/platform/x86/intel/vsec.h
@@ -69,6 +69,7 @@ enum intel_vsec_quirks {
 
 /* Platform specific data */
 struct intel_vsec_platform_info {
+	struct device *parent;
 	struct intel_vsec_header **headers;
 	unsigned long caps;
 	unsigned long quirks;
@@ -99,4 +100,7 @@ static inline struct intel_vsec_device *auxdev_to_ivdev(struct auxiliary_device
 {
 	return container_of(auxdev, struct intel_vsec_device, auxdev);
 }
+
+void intel_vsec_register(struct pci_dev *pdev,
+			 struct intel_vsec_platform_info *info);
 #endif
-- 
2.34.1

[PATCH V5 07/20] platform/x86/intel/vsec: Add base address field

[David E. Box]

Some devices may emulate PCI VSEC capabilities in MMIO. In such cases the
BAR is not readable from a config space. Provide a field for drivers to
indicate the base address to be used.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
V5 - No change

V4 - No change

V3 - No change

V2 - No change

 drivers/platform/x86/intel/pmt/class.c | 14 +++++++++++---
 drivers/platform/x86/intel/vsec.c      | 10 ++++++++--
 drivers/platform/x86/intel/vsec.h      |  2 ++
 3 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/intel/pmt/class.c b/drivers/platform/x86/intel/pmt/class.c
index 2ad91d2fd954..32608baaa56c 100644
--- a/drivers/platform/x86/intel/pmt/class.c
+++ b/drivers/platform/x86/intel/pmt/class.c
@@ -160,10 +160,11 @@ static struct class intel_pmt_class = {
 
 static int intel_pmt_populate_entry(struct intel_pmt_entry *entry,
 				    struct intel_pmt_header *header,
-				    struct device *dev,
+				    struct intel_vsec_device *ivdev,
 				    struct resource *disc_res)
 {
-	struct pci_dev *pci_dev = to_pci_dev(dev->parent);
+	struct pci_dev *pci_dev = ivdev->pcidev;
+	struct device *dev = &ivdev->auxdev.dev;
 	u8 bir;
 
 	/*
@@ -215,6 +216,13 @@ static int intel_pmt_populate_entry(struct intel_pmt_entry *entry,
 
 		break;
 	case ACCESS_BARID:
+		/* Use the provided base address if it exists */
+		if (ivdev->base_addr) {
+			entry->base_addr = ivdev->base_addr +
+				   GET_ADDRESS(header->base_offset);
+			break;
+		}
+
 		/*
 		 * If another BAR was specified then the base offset
 		 * represents the offset within that BAR. SO retrieve the
@@ -319,7 +327,7 @@ int intel_pmt_dev_create(struct intel_pmt_entry *entry, struct intel_pmt_namespa
 	if (ret)
 		return ret;
 
-	ret = intel_pmt_populate_entry(entry, &header, dev, disc_res);
+	ret = intel_pmt_populate_entry(entry, &header, intel_vsec_dev, disc_res);
 	if (ret)
 		return ret;
 
diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
index 03eabb7d3d3d..c95060c5682c 100644
--- a/drivers/platform/x86/intel/vsec.c
+++ b/drivers/platform/x86/intel/vsec.c
@@ -161,6 +161,7 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
 	struct resource *tmp;
 	struct device *parent;
 	unsigned long quirks = info->quirks;
+	u64 base_addr;
 	int i;
 
 	if (info->parent)
@@ -192,14 +193,18 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
 	if (quirks & VSEC_QUIRK_TABLE_SHIFT)
 		header->offset >>= TABLE_OFFSET_SHIFT;
 
+	if (info->base_addr)
+		base_addr = info->base_addr;
+	else
+		base_addr = pdev->resource[header->tbir].start;
+
 	/*
 	 * The DVSEC/VSEC contains the starting offset and count for a block of
 	 * discovery tables. Create a resource array of these tables to the
 	 * auxiliary device driver.
 	 */
 	for (i = 0, tmp = res; i < header->num_entries; i++, tmp++) {
-		tmp->start = pdev->resource[header->tbir].start +
-			     header->offset + i * (header->entry_size * sizeof(u32));
+		tmp->start = base_addr + header->offset + i * (header->entry_size * sizeof(u32));
 		tmp->end = tmp->start + (header->entry_size * sizeof(u32)) - 1;
 		tmp->flags = IORESOURCE_MEM;
 
@@ -214,6 +219,7 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
 	intel_vsec_dev->resource = no_free_ptr(res);
 	intel_vsec_dev->num_resources = header->num_entries;
 	intel_vsec_dev->quirks = info->quirks;
+	intel_vsec_dev->base_addr = info->base_addr;
 
 	if (header->id == VSEC_ID_SDSI)
 		intel_vsec_dev->ida = &intel_vsec_sdsi_ida;
diff --git a/drivers/platform/x86/intel/vsec.h b/drivers/platform/x86/intel/vsec.h
index bb8b6452df70..e23e76129691 100644
--- a/drivers/platform/x86/intel/vsec.h
+++ b/drivers/platform/x86/intel/vsec.h
@@ -73,6 +73,7 @@ struct intel_vsec_platform_info {
 	struct intel_vsec_header **headers;
 	unsigned long caps;
 	unsigned long quirks;
+	u64 base_addr;
 };
 
 struct intel_vsec_device {
@@ -85,6 +86,7 @@ struct intel_vsec_device {
 	void *priv_data;
 	size_t priv_data_size;
 	unsigned long quirks;
+	u64 base_addr;
 };
 
 int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
-- 
2.34.1

[PATCH V5 08/20] platform/x86/intel/pmt: Add header to struct intel_pmt_entry

[David E. Box]

The PMT header is passed to several functions. Instead, store the header in
struct intel_pmt_entry which is also passed to these functions and shorten
the argument list. This simplifies the calls in preparation for later
changes. While here also perform a newline cleanup.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
V5 - Mention newline cleanup in changelog

V4 - No change

V3 - No change

V2 - No change

 drivers/platform/x86/intel/pmt/class.c     |  8 +++-----
 drivers/platform/x86/intel/pmt/class.h     | 16 ++++++++--------
 drivers/platform/x86/intel/pmt/crashlog.c  |  2 +-
 drivers/platform/x86/intel/pmt/telemetry.c |  2 +-
 4 files changed, 13 insertions(+), 15 deletions(-)

diff --git a/drivers/platform/x86/intel/pmt/class.c b/drivers/platform/x86/intel/pmt/class.c
index 32608baaa56c..142a24e3727d 100644
--- a/drivers/platform/x86/intel/pmt/class.c
+++ b/drivers/platform/x86/intel/pmt/class.c
@@ -159,12 +159,12 @@ static struct class intel_pmt_class = {
 };
 
 static int intel_pmt_populate_entry(struct intel_pmt_entry *entry,
-				    struct intel_pmt_header *header,
 				    struct intel_vsec_device *ivdev,
 				    struct resource *disc_res)
 {
 	struct pci_dev *pci_dev = ivdev->pcidev;
 	struct device *dev = &ivdev->auxdev.dev;
+	struct intel_pmt_header *header = &entry->header;
 	u8 bir;
 
 	/*
@@ -313,7 +313,6 @@ int intel_pmt_dev_create(struct intel_pmt_entry *entry, struct intel_pmt_namespa
 			 struct intel_vsec_device *intel_vsec_dev, int idx)
 {
 	struct device *dev = &intel_vsec_dev->auxdev.dev;
-	struct intel_pmt_header header;
 	struct resource	*disc_res;
 	int ret;
 
@@ -323,16 +322,15 @@ int intel_pmt_dev_create(struct intel_pmt_entry *entry, struct intel_pmt_namespa
 	if (IS_ERR(entry->disc_table))
 		return PTR_ERR(entry->disc_table);
 
-	ret = ns->pmt_header_decode(entry, &header, dev);
+	ret = ns->pmt_header_decode(entry, dev);
 	if (ret)
 		return ret;
 
-	ret = intel_pmt_populate_entry(entry, &header, intel_vsec_dev, disc_res);
+	ret = intel_pmt_populate_entry(entry, intel_vsec_dev, disc_res);
 	if (ret)
 		return ret;
 
 	return intel_pmt_dev_register(entry, ns, dev);
-
 }
 EXPORT_SYMBOL_NS_GPL(intel_pmt_dev_create, INTEL_PMT);
 
diff --git a/drivers/platform/x86/intel/pmt/class.h b/drivers/platform/x86/intel/pmt/class.h
index db11d58867ce..e477a19f6700 100644
--- a/drivers/platform/x86/intel/pmt/class.h
+++ b/drivers/platform/x86/intel/pmt/class.h
@@ -18,7 +18,15 @@
 #define GET_BIR(v)		((v) & GENMASK(2, 0))
 #define GET_ADDRESS(v)		((v) & GENMASK(31, 3))
 
+struct intel_pmt_header {
+	u32	base_offset;
+	u32	size;
+	u32	guid;
+	u8	access_type;
+};
+
 struct intel_pmt_entry {
+	struct intel_pmt_header	header;
 	struct bin_attribute	pmt_bin_attr;
 	struct kobject		*kobj;
 	void __iomem		*disc_table;
@@ -29,19 +37,11 @@ struct intel_pmt_entry {
 	int			devid;
 };
 
-struct intel_pmt_header {
-	u32	base_offset;
-	u32	size;
-	u32	guid;
-	u8	access_type;
-};
-
 struct intel_pmt_namespace {
 	const char *name;
 	struct xarray *xa;
 	const struct attribute_group *attr_grp;
 	int (*pmt_header_decode)(struct intel_pmt_entry *entry,
-				 struct intel_pmt_header *header,
 				 struct device *dev);
 };
 
diff --git a/drivers/platform/x86/intel/pmt/crashlog.c b/drivers/platform/x86/intel/pmt/crashlog.c
index bbb3d61d09f4..4014c02cafdb 100644
--- a/drivers/platform/x86/intel/pmt/crashlog.c
+++ b/drivers/platform/x86/intel/pmt/crashlog.c
@@ -223,10 +223,10 @@ static const struct attribute_group pmt_crashlog_group = {
 };
 
 static int pmt_crashlog_header_decode(struct intel_pmt_entry *entry,
-				      struct intel_pmt_header *header,
 				      struct device *dev)
 {
 	void __iomem *disc_table = entry->disc_table;
+	struct intel_pmt_header *header = &entry->header;
 	struct crashlog_entry *crashlog;
 
 	if (!pmt_crashlog_supported(entry))
diff --git a/drivers/platform/x86/intel/pmt/telemetry.c b/drivers/platform/x86/intel/pmt/telemetry.c
index 39cbc87cc28a..f86080e8bebd 100644
--- a/drivers/platform/x86/intel/pmt/telemetry.c
+++ b/drivers/platform/x86/intel/pmt/telemetry.c
@@ -58,10 +58,10 @@ static bool pmt_telem_region_overlaps(struct intel_pmt_entry *entry,
 }
 
 static int pmt_telem_header_decode(struct intel_pmt_entry *entry,
-				   struct intel_pmt_header *header,
 				   struct device *dev)
 {
 	void __iomem *disc_table = entry->disc_table;
+	struct intel_pmt_header *header = &entry->header;
 
 	if (pmt_telem_region_overlaps(entry, dev))
 		return 1;
-- 
2.34.1

[PATCH V5 09/20] platform/x86/intel/pmt: telemetry: Export API to read telemetry

[David E. Box]

Export symbols to allow access to Intel PMT Telemetry data on available
devices. Provides APIs to search, register, and read telemetry using a
kref managed pointer that serves as a handle to a telemetry endpoint.
To simplify searching for present devices, have the IDA start at 1
instead of 0 so that 0 can be used to indicate end of search.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
V5 - No change

V4 - No change

V3 - Add comment for mutex lock
   - Fix multiline comments
   - Fix line lengths
   - Fix space/tab inconsistences in header doc

V2 - Add explanation of PMT_XA_START change in changelog
   - change return and argument type of pmt_telem_get_next_endpoint() to
     unsigned long
   - style fixes

 drivers/platform/x86/intel/pmt/class.c     |  21 ++-
 drivers/platform/x86/intel/pmt/class.h     |  14 ++
 drivers/platform/x86/intel/pmt/telemetry.c | 191 ++++++++++++++++++++-
 drivers/platform/x86/intel/pmt/telemetry.h | 126 ++++++++++++++
 4 files changed, 344 insertions(+), 8 deletions(-)
 create mode 100644 drivers/platform/x86/intel/pmt/telemetry.h

diff --git a/drivers/platform/x86/intel/pmt/class.c b/drivers/platform/x86/intel/pmt/class.c
index 142a24e3727d..4b53940a64e2 100644
--- a/drivers/platform/x86/intel/pmt/class.c
+++ b/drivers/platform/x86/intel/pmt/class.c
@@ -17,7 +17,7 @@
 #include "../vsec.h"
 #include "class.h"
 
-#define PMT_XA_START		0
+#define PMT_XA_START		1
 #define PMT_XA_MAX		INT_MAX
 #define PMT_XA_LIMIT		XA_LIMIT(PMT_XA_START, PMT_XA_MAX)
 #define GUID_SPR_PUNIT		0x9956f43f
@@ -247,6 +247,7 @@ static int intel_pmt_dev_register(struct intel_pmt_entry *entry,
 				  struct intel_pmt_namespace *ns,
 				  struct device *parent)
 {
+	struct intel_vsec_device *ivdev = dev_to_ivdev(parent);
 	struct resource res = {0};
 	struct device *dev;
 	int ret;
@@ -270,7 +271,7 @@ static int intel_pmt_dev_register(struct intel_pmt_entry *entry,
 	if (ns->attr_grp) {
 		ret = sysfs_create_group(entry->kobj, ns->attr_grp);
 		if (ret)
-			goto fail_sysfs;
+			goto fail_sysfs_create_group;
 	}
 
 	/* if size is 0 assume no data buffer, so no file needed */
@@ -295,13 +296,23 @@ static int intel_pmt_dev_register(struct intel_pmt_entry *entry,
 	entry->pmt_bin_attr.size = entry->size;
 
 	ret = sysfs_create_bin_file(&dev->kobj, &entry->pmt_bin_attr);
-	if (!ret)
-		return 0;
+	if (ret)
+		goto fail_ioremap;
 
+	if (ns->pmt_add_endpoint) {
+		ret = ns->pmt_add_endpoint(entry, ivdev->pcidev);
+		if (ret)
+			goto fail_add_endpoint;
+	}
+
+	return 0;
+
+fail_add_endpoint:
+	sysfs_remove_bin_file(entry->kobj, &entry->pmt_bin_attr);
 fail_ioremap:
 	if (ns->attr_grp)
 		sysfs_remove_group(entry->kobj, ns->attr_grp);
-fail_sysfs:
+fail_sysfs_create_group:
 	device_unregister(dev);
 fail_dev_create:
 	xa_erase(ns->xa, entry->devid);
diff --git a/drivers/platform/x86/intel/pmt/class.h b/drivers/platform/x86/intel/pmt/class.h
index e477a19f6700..d23c63b73ab7 100644
--- a/drivers/platform/x86/intel/pmt/class.h
+++ b/drivers/platform/x86/intel/pmt/class.h
@@ -9,6 +9,7 @@
 #include <linux/io.h>
 
 #include "../vsec.h"
+#include "telemetry.h"
 
 /* PMT access types */
 #define ACCESS_BARID		2
@@ -18,6 +19,16 @@
 #define GET_BIR(v)		((v) & GENMASK(2, 0))
 #define GET_ADDRESS(v)		((v) & GENMASK(31, 3))
 
+struct pci_dev;
+
+struct telem_endpoint {
+	struct pci_dev		*pcidev;
+	struct telem_header	header;
+	void __iomem		*base;
+	bool			present;
+	struct kref		kref;
+};
+
 struct intel_pmt_header {
 	u32	base_offset;
 	u32	size;
@@ -26,6 +37,7 @@ struct intel_pmt_header {
 };
 
 struct intel_pmt_entry {
+	struct telem_endpoint	*ep;
 	struct intel_pmt_header	header;
 	struct bin_attribute	pmt_bin_attr;
 	struct kobject		*kobj;
@@ -43,6 +55,8 @@ struct intel_pmt_namespace {
 	const struct attribute_group *attr_grp;
 	int (*pmt_header_decode)(struct intel_pmt_entry *entry,
 				 struct device *dev);
+	int (*pmt_add_endpoint)(struct intel_pmt_entry *entry,
+				struct pci_dev *pdev);
 };
 
 bool intel_pmt_is_early_client_hw(struct device *dev);
diff --git a/drivers/platform/x86/intel/pmt/telemetry.c b/drivers/platform/x86/intel/pmt/telemetry.c
index f86080e8bebd..09258564dfc4 100644
--- a/drivers/platform/x86/intel/pmt/telemetry.c
+++ b/drivers/platform/x86/intel/pmt/telemetry.c
@@ -30,6 +30,15 @@
 /* Used by client hardware to identify a fixed telemetry entry*/
 #define TELEM_CLIENT_FIXED_BLOCK_GUID	0x10000000
 
+#define NUM_BYTES_QWORD(v)	((v) << 3)
+#define SAMPLE_ID_OFFSET(v)	((v) << 3)
+
+#define NUM_BYTES_DWORD(v)	((v) << 2)
+#define SAMPLE_ID_OFFSET32(v)	((v) << 2)
+
+/* Protects access to the xarray of telemetry endpoint handles */
+static DEFINE_MUTEX(ep_lock);
+
 enum telem_type {
 	TELEM_TYPE_PUNIT = 0,
 	TELEM_TYPE_CRASHLOG,
@@ -84,21 +93,195 @@ static int pmt_telem_header_decode(struct intel_pmt_entry *entry,
 	return 0;
 }
 
+static int pmt_telem_add_endpoint(struct intel_pmt_entry *entry,
+				  struct pci_dev *pdev)
+{
+	struct telem_endpoint *ep;
+
+	/* Endpoint lifetimes are managed by kref, not devres */
+	entry->ep = kzalloc(sizeof(*(entry->ep)), GFP_KERNEL);
+	if (!entry->ep)
+		return -ENOMEM;
+
+	ep = entry->ep;
+	ep->pcidev = pdev;
+	ep->header.access_type = entry->header.access_type;
+	ep->header.guid = entry->header.guid;
+	ep->header.base_offset = entry->header.base_offset;
+	ep->header.size = entry->header.size;
+	ep->base = entry->base;
+	ep->present = true;
+
+	kref_init(&ep->kref);
+
+	return 0;
+}
+
 static DEFINE_XARRAY_ALLOC(telem_array);
 static struct intel_pmt_namespace pmt_telem_ns = {
 	.name = "telem",
 	.xa = &telem_array,
 	.pmt_header_decode = pmt_telem_header_decode,
+	.pmt_add_endpoint = pmt_telem_add_endpoint,
 };
 
+/* Called when all users unregister and the device is removed */
+static void pmt_telem_ep_release(struct kref *kref)
+{
+	struct telem_endpoint *ep;
+
+	ep = container_of(kref, struct telem_endpoint, kref);
+	kfree(ep);
+}
+
+unsigned long pmt_telem_get_next_endpoint(unsigned long start)
+{
+	struct intel_pmt_entry *entry;
+	unsigned long found_idx;
+
+	mutex_lock(&ep_lock);
+	xa_for_each_start(&telem_array, found_idx, entry, start) {
+		/*
+		 * Return first found index after start.
+		 * 0 is not valid id.
+		 */
+		if (found_idx > start)
+			break;
+	}
+	mutex_unlock(&ep_lock);
+
+	return found_idx == start ? 0 : found_idx;
+}
+EXPORT_SYMBOL_NS_GPL(pmt_telem_get_next_endpoint, INTEL_PMT_TELEMETRY);
+
+struct telem_endpoint *pmt_telem_register_endpoint(int devid)
+{
+	struct intel_pmt_entry *entry;
+	unsigned long index = devid;
+
+	mutex_lock(&ep_lock);
+	entry = xa_find(&telem_array, &index, index, XA_PRESENT);
+	if (!entry) {
+		mutex_unlock(&ep_lock);
+		return ERR_PTR(-ENXIO);
+	}
+
+	kref_get(&entry->ep->kref);
+	mutex_unlock(&ep_lock);
+
+	return entry->ep;
+}
+EXPORT_SYMBOL_NS_GPL(pmt_telem_register_endpoint, INTEL_PMT_TELEMETRY);
+
+void pmt_telem_unregister_endpoint(struct telem_endpoint *ep)
+{
+	kref_put(&ep->kref, pmt_telem_ep_release);
+}
+EXPORT_SYMBOL_NS_GPL(pmt_telem_unregister_endpoint, INTEL_PMT_TELEMETRY);
+
+int pmt_telem_get_endpoint_info(int devid, struct telem_endpoint_info *info)
+{
+	struct intel_pmt_entry *entry;
+	unsigned long index = devid;
+	int err = 0;
+
+	if (!info)
+		return -EINVAL;
+
+	mutex_lock(&ep_lock);
+	entry = xa_find(&telem_array, &index, index, XA_PRESENT);
+	if (!entry) {
+		err = -ENXIO;
+		goto unlock;
+	}
+
+	info->pdev = entry->ep->pcidev;
+	info->header = entry->ep->header;
+
+unlock:
+	mutex_unlock(&ep_lock);
+	return err;
+
+}
+EXPORT_SYMBOL_NS_GPL(pmt_telem_get_endpoint_info, INTEL_PMT_TELEMETRY);
+
+int pmt_telem_read(struct telem_endpoint *ep, u32 id, u64 *data, u32 count)
+{
+	u32 offset, size;
+
+	if (!ep->present)
+		return -ENODEV;
+
+	offset = SAMPLE_ID_OFFSET(id);
+	size = ep->header.size;
+
+	if (offset + NUM_BYTES_QWORD(count) > size)
+		return -EINVAL;
+
+	memcpy_fromio(data, ep->base + offset, NUM_BYTES_QWORD(count));
+
+	return ep->present ? 0 : -EPIPE;
+}
+EXPORT_SYMBOL_NS_GPL(pmt_telem_read, INTEL_PMT_TELEMETRY);
+
+int pmt_telem_read32(struct telem_endpoint *ep, u32 id, u32 *data, u32 count)
+{
+	u32 offset, size;
+
+	if (!ep->present)
+		return -ENODEV;
+
+	offset = SAMPLE_ID_OFFSET32(id);
+	size = ep->header.size;
+
+	if (offset + NUM_BYTES_DWORD(count) > size)
+		return -EINVAL;
+
+	memcpy_fromio(data, ep->base + offset, NUM_BYTES_DWORD(count));
+
+	return ep->present ? 0 : -EPIPE;
+}
+EXPORT_SYMBOL_NS_GPL(pmt_telem_read32, INTEL_PMT_TELEMETRY);
+
+struct telem_endpoint *
+pmt_telem_find_and_register_endpoint(struct pci_dev *pcidev, u32 guid, u16 pos)
+{
+	int devid = 0;
+	int inst = 0;
+	int err = 0;
+
+	while ((devid = pmt_telem_get_next_endpoint(devid))) {
+		struct telem_endpoint_info ep_info;
+
+		err = pmt_telem_get_endpoint_info(devid, &ep_info);
+		if (err)
+			return ERR_PTR(err);
+
+		if (ep_info.header.guid == guid && ep_info.pdev == pcidev) {
+			if (inst == pos)
+				return pmt_telem_register_endpoint(devid);
+			++inst;
+		}
+	}
+
+	return ERR_PTR(-ENXIO);
+}
+EXPORT_SYMBOL_NS_GPL(pmt_telem_find_and_register_endpoint, INTEL_PMT_TELEMETRY);
+
 static void pmt_telem_remove(struct auxiliary_device *auxdev)
 {
 	struct pmt_telem_priv *priv = auxiliary_get_drvdata(auxdev);
 	int i;
 
-	for (i = 0; i < priv->num_entries; i++)
-		intel_pmt_dev_destroy(&priv->entry[i], &pmt_telem_ns);
-}
+	mutex_lock(&ep_lock);
+	for (i = 0; i < priv->num_entries; i++) {
+		struct intel_pmt_entry *entry = &priv->entry[i];
+
+		kref_put(&entry->ep->kref, pmt_telem_ep_release);
+		intel_pmt_dev_destroy(entry, &pmt_telem_ns);
+	}
+	mutex_unlock(&ep_lock);
+};
 
 static int pmt_telem_probe(struct auxiliary_device *auxdev, const struct auxiliary_device_id *id)
 {
@@ -117,7 +300,9 @@ static int pmt_telem_probe(struct auxiliary_device *auxdev, const struct auxilia
 	for (i = 0; i < intel_vsec_dev->num_resources; i++) {
 		struct intel_pmt_entry *entry = &priv->entry[priv->num_entries];
 
+		mutex_lock(&ep_lock);
 		ret = intel_pmt_dev_create(entry, &pmt_telem_ns, intel_vsec_dev, i);
+		mutex_unlock(&ep_lock);
 		if (ret < 0)
 			goto abort_probe;
 		if (ret)
diff --git a/drivers/platform/x86/intel/pmt/telemetry.h b/drivers/platform/x86/intel/pmt/telemetry.h
new file mode 100644
index 000000000000..d45af5512b4e
--- /dev/null
+++ b/drivers/platform/x86/intel/pmt/telemetry.h
@@ -0,0 +1,126 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _TELEMETRY_H
+#define _TELEMETRY_H
+
+/* Telemetry types */
+#define PMT_TELEM_TELEMETRY	0
+#define PMT_TELEM_CRASHLOG	1
+
+struct telem_endpoint;
+struct pci_dev;
+
+struct telem_header {
+	u8	access_type;
+	u16	size;
+	u32	guid;
+	u32	base_offset;
+};
+
+struct telem_endpoint_info {
+	struct pci_dev		*pdev;
+	struct telem_header	header;
+};
+
+/**
+ * pmt_telem_get_next_endpoint() - Get next device id for a telemetry endpoint
+ * @start:  starting devid to look from
+ *
+ * This functions can be used in a while loop predicate to retrieve the devid
+ * of all available telemetry endpoints. Functions pmt_telem_get_next_endpoint()
+ * and pmt_telem_register_endpoint() can be used inside of the loop to examine
+ * endpoint info and register to receive a pointer to the endpoint. The pointer
+ * is then usable in the telemetry read calls to access the telemetry data.
+ *
+ * Return:
+ * * devid       - devid of the next present endpoint from start
+ * * 0           - when no more endpoints are present after start
+ */
+unsigned long pmt_telem_get_next_endpoint(unsigned long start);
+
+/**
+ * pmt_telem_register_endpoint() - Register a telemetry endpoint
+ * @devid: device id/handle of the telemetry endpoint
+ *
+ * Increments the kref usage counter for the endpoint.
+ *
+ * Return:
+ * * endpoint    - On success returns pointer to the telemetry endpoint
+ * * -ENXIO      - telemetry endpoint not found
+ */
+struct telem_endpoint *pmt_telem_register_endpoint(int devid);
+
+/**
+ * pmt_telem_unregister_endpoint() - Unregister a telemetry endpoint
+ * @ep:   ep structure to populate.
+ *
+ * Decrements the kref usage counter for the endpoint.
+ */
+void pmt_telem_unregister_endpoint(struct telem_endpoint *ep);
+
+/**
+ * pmt_telem_get_endpoint_info() - Get info for an endpoint from its devid
+ * @devid:  device id/handle of the telemetry endpoint
+ * @info:   Endpoint info structure to be populated
+ *
+ * Return:
+ * * 0           - Success
+ * * -ENXIO      - telemetry endpoint not found for the devid
+ * * -EINVAL     - @info is NULL
+ */
+int pmt_telem_get_endpoint_info(int devid, struct telem_endpoint_info *info);
+
+/**
+ * pmt_telem_find_and_register_endpoint() - Get a telemetry endpoint from
+ * pci_dev device, guid and pos
+ * @pdev:   PCI device inside the Intel vsec
+ * @guid:   GUID of the telemetry space
+ * @pos:    Instance of the guid
+ *
+ * Return:
+ * * endpoint    - On success returns pointer to the telemetry endpoint
+ * * -ENXIO      - telemetry endpoint not found
+ */
+struct telem_endpoint *pmt_telem_find_and_register_endpoint(struct pci_dev *pcidev,
+				u32 guid, u16 pos);
+
+/**
+ * pmt_telem_read() - Read qwords from counter sram using sample id
+ * @ep:     Telemetry endpoint to be read
+ * @id:     The beginning sample id of the metric(s) to be read
+ * @data:   Allocated qword buffer
+ * @count:  Number of qwords requested
+ *
+ * Callers must ensure reads are aligned. When the call returns -ENODEV,
+ * the device has been removed and callers should unregister the telemetry
+ * endpoint.
+ *
+ * Return:
+ * * 0           - Success
+ * * -ENODEV     - The device is not present.
+ * * -EINVAL     - The offset is out bounds
+ * * -EPIPE      - The device was removed during the read. Data written
+ *                 but should be considered invalid.
+ */
+int pmt_telem_read(struct telem_endpoint *ep, u32 id, u64 *data, u32 count);
+
+/**
+ * pmt_telem_read32() - Read qwords from counter sram using sample id
+ * @ep:     Telemetry endpoint to be read
+ * @id:     The beginning sample id of the metric(s) to be read
+ * @data:   Allocated dword buffer
+ * @count:  Number of dwords requested
+ *
+ * Callers must ensure reads are aligned. When the call returns -ENODEV,
+ * the device has been removed and callers should unregister the telemetry
+ * endpoint.
+ *
+ * Return:
+ * * 0           - Success
+ * * -ENODEV     - The device is not present.
+ * * -EINVAL     - The offset is out bounds
+ * * -EPIPE      - The device was removed during the read. Data written
+ *                 but should be considered invalid.
+ */
+int pmt_telem_read32(struct telem_endpoint *ep, u32 id, u32 *data, u32 count);
+
+#endif
-- 
2.34.1

[PATCH V5 10/20] platform/x86:intel/pmc: Call pmc_get_low_power_modes from platform init

[David E. Box]

From: Xi Pardee <xi.pardee@intel.com>

In order to setup a table of low power mode requirements for Meteor Lake,
pmc_core_get_low_power_modes() will need to be run from platform init code
so that the enabled modes are known, allowing the use of the
pmc_for_each_mode helper. Make the function global and call it from the
platform init code.

Signed-off-by: Xi Pardee <xi.pardee@intel.com>
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
V5 - No change

V4 - No change

V3 - No change

V2 - Added clearer explanation for the change in the changelog

 drivers/platform/x86/intel/pmc/adl.c  |  2 ++
 drivers/platform/x86/intel/pmc/cnp.c  |  2 ++
 drivers/platform/x86/intel/pmc/core.c |  7 +++----
 drivers/platform/x86/intel/pmc/core.h |  1 +
 drivers/platform/x86/intel/pmc/icl.c  | 10 +++++++++-
 drivers/platform/x86/intel/pmc/mtl.c  |  4 +++-
 drivers/platform/x86/intel/pmc/spt.c  | 10 +++++++++-
 drivers/platform/x86/intel/pmc/tgl.c  |  1 +
 8 files changed, 30 insertions(+), 7 deletions(-)

diff --git a/drivers/platform/x86/intel/pmc/adl.c b/drivers/platform/x86/intel/pmc/adl.c
index 5006008e01be..64c492391ede 100644
--- a/drivers/platform/x86/intel/pmc/adl.c
+++ b/drivers/platform/x86/intel/pmc/adl.c
@@ -319,6 +319,8 @@ int adl_core_init(struct pmc_dev *pmcdev)
 	if (ret)
 		return ret;
 
+	pmc_core_get_low_power_modes(pmcdev);
+
 	/* Due to a hardware limitation, the GBE LTR blocks PC10
 	 * when a cable is attached. Tell the PMC to ignore it.
 	 */
diff --git a/drivers/platform/x86/intel/pmc/cnp.c b/drivers/platform/x86/intel/pmc/cnp.c
index 420aaa1d7c76..59298f184d0e 100644
--- a/drivers/platform/x86/intel/pmc/cnp.c
+++ b/drivers/platform/x86/intel/pmc/cnp.c
@@ -214,6 +214,8 @@ int cnp_core_init(struct pmc_dev *pmcdev)
 	if (ret)
 		return ret;
 
+	pmc_core_get_low_power_modes(pmcdev);
+
 	/* Due to a hardware limitation, the GBE LTR blocks PC10
 	 * when a cable is attached. Tell the PMC to ignore it.
 	 */
diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
index 84c175b9721a..3894119d61b0 100644
--- a/drivers/platform/x86/intel/pmc/core.c
+++ b/drivers/platform/x86/intel/pmc/core.c
@@ -966,9 +966,8 @@ static bool pmc_core_pri_verify(u32 lpm_pri, u8 *mode_order)
 	return true;
 }
 
-static void pmc_core_get_low_power_modes(struct platform_device *pdev)
+void pmc_core_get_low_power_modes(struct pmc_dev *pmcdev)
 {
-	struct pmc_dev *pmcdev = platform_get_drvdata(pdev);
 	struct pmc *pmc = pmcdev->pmcs[PMC_IDX_MAIN];
 	u8 pri_order[LPM_MAX_NUM_MODES] = LPM_DEFAULT_PRI;
 	u8 mode_order[LPM_MAX_NUM_MODES];
@@ -1000,7 +999,8 @@ static void pmc_core_get_low_power_modes(struct platform_device *pdev)
 		for (mode = 0; mode < LPM_MAX_NUM_MODES; mode++)
 			pri_order[mode_order[mode]] = mode;
 	else
-		dev_warn(&pdev->dev, "Assuming a default substate order for this platform\n");
+		dev_warn(&pmcdev->pdev->dev,
+			 "Assuming a default substate order for this platform\n");
 
 	/*
 	 * Loop through all modes from lowest to highest priority,
@@ -1250,7 +1250,6 @@ static int pmc_core_probe(struct platform_device *pdev)
 	}
 
 	pmcdev->pmc_xram_read_bit = pmc_core_check_read_lock_bit(primary_pmc);
-	pmc_core_get_low_power_modes(pdev);
 	pmc_core_do_dmi_quirks(primary_pmc);
 
 	pmc_core_dbgfs_register(pmcdev);
diff --git a/drivers/platform/x86/intel/pmc/core.h b/drivers/platform/x86/intel/pmc/core.h
index 0729f593c6a7..ccf24e0f5e50 100644
--- a/drivers/platform/x86/intel/pmc/core.h
+++ b/drivers/platform/x86/intel/pmc/core.h
@@ -490,6 +490,7 @@ extern int pmc_core_send_ltr_ignore(struct pmc_dev *pmcdev, u32 value);
 
 int pmc_core_resume_common(struct pmc_dev *pmcdev);
 int get_primary_reg_base(struct pmc *pmc);
+extern void pmc_core_get_low_power_modes(struct pmc_dev *pmcdev);
 
 extern void pmc_core_ssram_init(struct pmc_dev *pmcdev);
 
diff --git a/drivers/platform/x86/intel/pmc/icl.c b/drivers/platform/x86/intel/pmc/icl.c
index d08e3174230d..71b0fd6cb7d8 100644
--- a/drivers/platform/x86/intel/pmc/icl.c
+++ b/drivers/platform/x86/intel/pmc/icl.c
@@ -53,7 +53,15 @@ const struct pmc_reg_map icl_reg_map = {
 int icl_core_init(struct pmc_dev *pmcdev)
 {
 	struct pmc *pmc = pmcdev->pmcs[PMC_IDX_MAIN];
+	int ret;
 
 	pmc->map = &icl_reg_map;
-	return get_primary_reg_base(pmc);
+
+	ret = get_primary_reg_base(pmc);
+	if (ret)
+		return ret;
+
+	pmc_core_get_low_power_modes(pmcdev);
+
+	return ret;
 }
diff --git a/drivers/platform/x86/intel/pmc/mtl.c b/drivers/platform/x86/intel/pmc/mtl.c
index 2204bc666980..c3b5f4fe01d1 100644
--- a/drivers/platform/x86/intel/pmc/mtl.c
+++ b/drivers/platform/x86/intel/pmc/mtl.c
@@ -985,7 +985,7 @@ static int mtl_resume(struct pmc_dev *pmcdev)
 int mtl_core_init(struct pmc_dev *pmcdev)
 {
 	struct pmc *pmc = pmcdev->pmcs[PMC_IDX_SOC];
-	int ret = 0;
+	int ret;
 
 	mtl_d3_fixup();
 
@@ -1002,6 +1002,8 @@ int mtl_core_init(struct pmc_dev *pmcdev)
 			return ret;
 	}
 
+	pmc_core_get_low_power_modes(pmcdev);
+
 	/* Due to a hardware limitation, the GBE LTR blocks PC10
 	 * when a cable is attached. Tell the PMC to ignore it.
 	 */
diff --git a/drivers/platform/x86/intel/pmc/spt.c b/drivers/platform/x86/intel/pmc/spt.c
index 4b6f5cbda16c..ab993a69e33e 100644
--- a/drivers/platform/x86/intel/pmc/spt.c
+++ b/drivers/platform/x86/intel/pmc/spt.c
@@ -137,7 +137,15 @@ const struct pmc_reg_map spt_reg_map = {
 int spt_core_init(struct pmc_dev *pmcdev)
 {
 	struct pmc *pmc = pmcdev->pmcs[PMC_IDX_MAIN];
+	int ret;
 
 	pmc->map = &spt_reg_map;
-	return get_primary_reg_base(pmc);
+
+	ret = get_primary_reg_base(pmc);
+	if (ret)
+		return ret;
+
+	pmc_core_get_low_power_modes(pmcdev);
+
+	return ret;
 }
diff --git a/drivers/platform/x86/intel/pmc/tgl.c b/drivers/platform/x86/intel/pmc/tgl.c
index 2449940102db..d5f1d2223c5a 100644
--- a/drivers/platform/x86/intel/pmc/tgl.c
+++ b/drivers/platform/x86/intel/pmc/tgl.c
@@ -263,6 +263,7 @@ int tgl_core_init(struct pmc_dev *pmcdev)
 	if (ret)
 		return ret;
 
+	pmc_core_get_low_power_modes(pmcdev);
 	pmc_core_get_tgl_lpm_reqs(pmcdev->pdev);
 	/* Due to a hardware limitation, the GBE LTR blocks PC10
 	 * when a cable is attached. Tell the PMC to ignore it.
-- 
2.34.1

[PATCH V5 11/20] platform/x86/intel/pmc: Allow pmc_core_ssram_init to fail

[David E. Box]

Currently, if the PMC SSRAM initialization fails, no error is returned and
the only indication is that a PMC device has not been created.  Instead,
allow an error to be returned and handled directly by the caller.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
V5 - No change

V4 - Remove return value check in mtl.c. Proper use of the value would
     require returning an error status from pmc_core_add_pmc(). But
     the function that calls it will be removed in the next patch so wait
     to use it then.

V3 - New patch split from V2 PATCH 9
   - Add dev_warn on pmc_core_ssram_init fail

 drivers/platform/x86/intel/pmc/core.h       |  2 +-
 drivers/platform/x86/intel/pmc/core_ssram.c | 21 +++++++++++++--------
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/platform/x86/intel/pmc/core.h b/drivers/platform/x86/intel/pmc/core.h
index ccf24e0f5e50..edaa70067e41 100644
--- a/drivers/platform/x86/intel/pmc/core.h
+++ b/drivers/platform/x86/intel/pmc/core.h
@@ -492,7 +492,7 @@ int pmc_core_resume_common(struct pmc_dev *pmcdev);
 int get_primary_reg_base(struct pmc *pmc);
 extern void pmc_core_get_low_power_modes(struct pmc_dev *pmcdev);
 
-extern void pmc_core_ssram_init(struct pmc_dev *pmcdev);
+extern int pmc_core_ssram_init(struct pmc_dev *pmcdev);
 
 int spt_core_init(struct pmc_dev *pmcdev);
 int cnp_core_init(struct pmc_dev *pmcdev);
diff --git a/drivers/platform/x86/intel/pmc/core_ssram.c b/drivers/platform/x86/intel/pmc/core_ssram.c
index 13fa16f0d52e..815950713e25 100644
--- a/drivers/platform/x86/intel/pmc/core_ssram.c
+++ b/drivers/platform/x86/intel/pmc/core_ssram.c
@@ -35,20 +35,20 @@ static inline u64 get_base(void __iomem *addr, u32 offset)
 	return lo_hi_readq(addr + offset) & GENMASK_ULL(63, 3);
 }
 
-static void
+static int
 pmc_core_pmc_add(struct pmc_dev *pmcdev, u64 pwrm_base,
 		 const struct pmc_reg_map *reg_map, int pmc_index)
 {
 	struct pmc *pmc = pmcdev->pmcs[pmc_index];
 
 	if (!pwrm_base)
-		return;
+		return -ENODEV;
 
 	/* Memory for primary PMC has been allocated in core.c */
 	if (!pmc) {
 		pmc = devm_kzalloc(&pmcdev->pdev->dev, sizeof(*pmc), GFP_KERNEL);
 		if (!pmc)
-			return;
+			return -ENOMEM;
 	}
 
 	pmc->map = reg_map;
@@ -57,10 +57,12 @@ pmc_core_pmc_add(struct pmc_dev *pmcdev, u64 pwrm_base,
 
 	if (!pmc->regbase) {
 		devm_kfree(&pmcdev->pdev->dev, pmc);
-		return;
+		return -ENOMEM;
 	}
 
 	pmcdev->pmcs[pmc_index] = pmc;
+
+	return 0;
 }
 
 static void
@@ -96,7 +98,7 @@ pmc_core_ssram_get_pmc(struct pmc_dev *pmcdev, void __iomem *ssram, u32 offset,
 		iounmap(ssram);
 }
 
-void pmc_core_ssram_init(struct pmc_dev *pmcdev)
+int pmc_core_ssram_init(struct pmc_dev *pmcdev)
 {
 	void __iomem *ssram;
 	struct pci_dev *pcidev;
@@ -105,7 +107,7 @@ void pmc_core_ssram_init(struct pmc_dev *pmcdev)
 
 	pcidev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(20, 2));
 	if (!pcidev)
-		goto out;
+		return -ENODEV;
 
 	ret = pcim_enable_device(pcidev);
 	if (ret)
@@ -123,11 +125,14 @@ void pmc_core_ssram_init(struct pmc_dev *pmcdev)
 	pmc_core_ssram_get_pmc(pmcdev, ssram, SSRAM_PCH_OFFSET, PMC_IDX_PCH);
 
 	iounmap(ssram);
-out:
-	return;
+
+	return 0;
 
 disable_dev:
+	pmcdev->ssram_pcidev = NULL;
 	pci_disable_device(pcidev);
 release_dev:
 	pci_dev_put(pcidev);
+
+	return ret;
 }
-- 
2.34.1

[PATCH V5 12/20] asm-generic/io.h: iounmap/ioport_unmap cleanup.h support

[David E. Box]

Add auto-release cleanups for iounmap() and ioport_unmap().

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Suggested-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
V2 - Move from linux/io.h to asm-generic/io.h. Adds iounmap cleanup if
     iounmap() is defined. Adds ioport_unmap cleanup if CONFIG_IOPORT_MAP
     is defined.

 include/asm-generic/io.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index bac63e874c7b..9ef0332490b1 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -8,6 +8,7 @@
 #define __ASM_GENERIC_IO_H
 
 #include <asm/page.h> /* I/O is all done through memory accesses */
+#include <linux/cleanup.h>
 #include <linux/string.h> /* for memset() and memcpy() */
 #include <linux/types.h>
 #include <linux/instruction_pointer.h>
@@ -1065,6 +1066,10 @@ static inline void __iomem *ioremap(phys_addr_t addr, size_t size)
 #endif
 #endif /* !CONFIG_MMU || CONFIG_GENERIC_IOREMAP */
 
+#ifdef iounmap
+DEFINE_FREE(iounmap, void __iomem *, iounmap(_T));
+#endif
+
 #ifndef ioremap_wc
 #define ioremap_wc ioremap
 #endif
@@ -1127,6 +1132,7 @@ static inline void ioport_unmap(void __iomem *p)
 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
 extern void ioport_unmap(void __iomem *p);
 #endif /* CONFIG_GENERIC_IOMAP */
+DEFINE_FREE(ioport_unmap, void __iomem *, ioport_unmap(_T));
 #endif /* CONFIG_HAS_IOPORT_MAP */
 
 #ifndef CONFIG_GENERIC_IOMAP
-- 
2.34.1

[PATCH V5 13/20] platform/x86/intel/pmc: Cleanup SSRAM discovery

[David E. Box]

Clean up the code handling SSRAM discovery. Handle all resource allocation
and cleanup in pmc_core_ssram_get_pmc(). Return the error status from this
function but only fail the init if we fail to discover the primary PMC.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
---
V5 - Use single function to handle SSRAM discovery of all PMCs.

V4 - Add checking the return value from pmc_core_sram_init() to mtl.c
   - Use iounmap cleanup from io.h

V3 - New patch split from previous PATCH 2
   - Update changelog
   - Use cleanup.h to cleanup ioremap

V2 - no change

 drivers/platform/x86/intel/pmc/core_ssram.c | 60 +++++++++++----------
 1 file changed, 31 insertions(+), 29 deletions(-)

diff --git a/drivers/platform/x86/intel/pmc/core_ssram.c b/drivers/platform/x86/intel/pmc/core_ssram.c
index 815950713e25..cb44394d88ce 100644
--- a/drivers/platform/x86/intel/pmc/core_ssram.c
+++ b/drivers/platform/x86/intel/pmc/core_ssram.c
@@ -8,6 +8,7 @@
  *
  */
 
+#include <linux/cleanup.h>
 #include <linux/pci.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
 
@@ -65,44 +66,49 @@ pmc_core_pmc_add(struct pmc_dev *pmcdev, u64 pwrm_base,
 	return 0;
 }
 
-static void
-pmc_core_ssram_get_pmc(struct pmc_dev *pmcdev, void __iomem *ssram, u32 offset,
-		       int pmc_idx)
+static int
+pmc_core_ssram_get_pmc(struct pmc_dev *pmcdev, int pmc_idx, u32 offset)
 {
-	u64 pwrm_base;
+	struct pci_dev *ssram_pcidev = pmcdev->ssram_pcidev;
+	void __iomem __free(iounmap) *tmp_ssram = NULL;
+	void __iomem __free(iounmap) *ssram = NULL;
+	const struct pmc_reg_map *map;
+	u64 ssram_base, pwrm_base;
 	u16 devid;
 
-	if (pmc_idx != PMC_IDX_SOC) {
-		u64 ssram_base = get_base(ssram, offset);
+	if (!pmcdev->regmap_list)
+		return -ENOENT;
 
-		if (!ssram_base)
-			return;
+	ssram_base = ssram_pcidev->resource[0].start;
+	tmp_ssram = ioremap(ssram_base, SSRAM_HDR_SIZE);
 
+	if (pmc_idx != PMC_IDX_MAIN) {
+		/*
+		 * The secondary PMC BARS (which are behind hidden PCI devices)
+		 * are read from fixed offsets in MMIO of the primary PMC BAR.
+		 */
+		ssram_base = get_base(tmp_ssram, offset);
 		ssram = ioremap(ssram_base, SSRAM_HDR_SIZE);
 		if (!ssram)
-			return;
+			return -ENOMEM;
+
+	} else {
+		ssram = no_free_ptr(tmp_ssram);
 	}
 
 	pwrm_base = get_base(ssram, SSRAM_PWRM_OFFSET);
 	devid = readw(ssram + SSRAM_DEVID_OFFSET);
 
-	if (pmcdev->regmap_list) {
-		const struct pmc_reg_map *map;
+	map = pmc_core_find_regmap(pmcdev->regmap_list, devid);
+	if (!map)
+		return -ENODEV;
 
-		map = pmc_core_find_regmap(pmcdev->regmap_list, devid);
-		if (map)
-			pmc_core_pmc_add(pmcdev, pwrm_base, map, pmc_idx);
-	}
-
-	if (pmc_idx != PMC_IDX_SOC)
-		iounmap(ssram);
+	return pmc_core_pmc_add(pmcdev, pwrm_base, map, PMC_IDX_MAIN);
 }
 
 int pmc_core_ssram_init(struct pmc_dev *pmcdev)
 {
-	void __iomem *ssram;
 	struct pci_dev *pcidev;
-	u64 ssram_base;
 	int ret;
 
 	pcidev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(20, 2));
@@ -113,18 +119,14 @@ int pmc_core_ssram_init(struct pmc_dev *pmcdev)
 	if (ret)
 		goto release_dev;
 
-	ssram_base = pcidev->resource[0].start;
-	ssram = ioremap(ssram_base, SSRAM_HDR_SIZE);
-	if (!ssram)
-		goto disable_dev;
-
 	pmcdev->ssram_pcidev = pcidev;
 
-	pmc_core_ssram_get_pmc(pmcdev, ssram, 0, PMC_IDX_SOC);
-	pmc_core_ssram_get_pmc(pmcdev, ssram, SSRAM_IOE_OFFSET, PMC_IDX_IOE);
-	pmc_core_ssram_get_pmc(pmcdev, ssram, SSRAM_PCH_OFFSET, PMC_IDX_PCH);
+	ret = pmc_core_ssram_get_pmc(pmcdev, PMC_IDX_MAIN, 0);
+	if (ret)
+		goto disable_dev;
 
-	iounmap(ssram);
+	pmc_core_ssram_get_pmc(pmcdev, PMC_IDX_IOE, SSRAM_IOE_OFFSET);
+	pmc_core_ssram_get_pmc(pmcdev, PMC_IDX_PCH, SSRAM_PCH_OFFSET);
 
 	return 0;
 
-- 
2.34.1

[PATCH V5 14/20] platform/x86/intel/pmc/mtl: Use return value from pmc_core_ssram_init()

[David E. Box]

Instead of checking for a NULL regbase, use the return value from
pmc_core_ssram_init() to check if PMC discovery was successful. If not, use
the legacy enumeration method (which only works for the primary PMC).

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
---
V5 - New patch. Split from previous.

 drivers/platform/x86/intel/pmc/mtl.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/x86/intel/pmc/mtl.c b/drivers/platform/x86/intel/pmc/mtl.c
index c3b5f4fe01d1..d1d3d33fb4b8 100644
--- a/drivers/platform/x86/intel/pmc/mtl.c
+++ b/drivers/platform/x86/intel/pmc/mtl.c
@@ -990,12 +990,16 @@ int mtl_core_init(struct pmc_dev *pmcdev)
 	mtl_d3_fixup();
 
 	pmcdev->resume = mtl_resume;
-
 	pmcdev->regmap_list = mtl_pmc_info_list;
-	pmc_core_ssram_init(pmcdev);
 
-	/* If regbase not assigned, set map and discover using legacy method */
-	if (!pmc->regbase) {
+	/*
+	 * If ssram init fails use legacy method to at least get the
+	 * primary PMC
+	 */
+	ret = pmc_core_ssram_init(pmcdev);
+	if (ret) {
+		dev_warn(&pmcdev->pdev->dev,
+			 "ssram init failed, %d, using legacy init\n", ret);
 		pmc->map = &mtl_socm_reg_map;
 		ret = get_primary_reg_base(pmc);
 		if (ret)
-- 
2.34.1

[PATCH V5 15/20] platform/x86/intel/pmc: Find and register PMC telemetry entries

[David E. Box]

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@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
V5 - no change

V4 - no change

V3 - no change

V2 - no change

 drivers/platform/x86/intel/pmc/Kconfig      |  1 +
 drivers/platform/x86/intel/pmc/core_ssram.c | 49 +++++++++++++++++++++
 2 files changed, 50 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 cb44394d88ce..a18e3a2e90fe 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
@@ -22,6 +24,49 @@
 #define SSRAM_IOE_OFFSET	0x68
 #define SSRAM_DEVID_OFFSET	0x70
 
+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)
@@ -99,6 +144,9 @@ pmc_core_ssram_get_pmc(struct pmc_dev *pmcdev, int pmc_idx, u32 offset)
 	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;
@@ -138,3 +186,4 @@ int pmc_core_ssram_init(struct pmc_dev *pmcdev)
 
 	return ret;
 }
+MODULE_IMPORT_NS(INTEL_VSEC);
-- 
2.34.1

[PATCH V5 16/20] platform/x86/intel/pmc: Display LPM requirements for multiple PMCs

[David E. Box]

From: Rajvi Jingar <rajvi.jingar@linux.intel.com>

Update the substate_requirements attribute to display the requirements for
all the PMCs on a package.

Signed-off-by: Rajvi Jingar <rajvi.jingar@linux.intel.com>
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
---
V5 - Use conditional instead of if/else to do seq_printf()

V4 - No change

V3 - Add missing submitter signoff

V2 - no change

 drivers/platform/x86/intel/pmc/core.c | 128 ++++++++++++++------------
 1 file changed, 68 insertions(+), 60 deletions(-)

diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
index 3894119d61b0..4a38d52558fd 100644
--- a/drivers/platform/x86/intel/pmc/core.c
+++ b/drivers/platform/x86/intel/pmc/core.c
@@ -728,7 +728,7 @@ static int pmc_core_substate_l_sts_regs_show(struct seq_file *s, void *unused)
 }
 DEFINE_SHOW_ATTRIBUTE(pmc_core_substate_l_sts_regs);
 
-static void pmc_core_substate_req_header_show(struct seq_file *s)
+static void pmc_core_substate_req_header_show(struct seq_file *s, int pmc_index)
 {
 	struct pmc_dev *pmcdev = s->private;
 	int i, mode;
@@ -743,68 +743,76 @@ static void pmc_core_substate_req_header_show(struct seq_file *s)
 static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused)
 {
 	struct pmc_dev *pmcdev = s->private;
-	struct pmc *pmc = pmcdev->pmcs[PMC_IDX_MAIN];
-	const struct pmc_bit_map **maps = pmc->map->lpm_sts;
-	const struct pmc_bit_map *map;
-	const int num_maps = pmc->map->lpm_num_maps;
-	u32 sts_offset = pmc->map->lpm_status_offset;
-	u32 *lpm_req_regs = pmc->lpm_req_regs;
-	int mp;
-
-	/* Display the header */
-	pmc_core_substate_req_header_show(s);
-
-	/* Loop over maps */
-	for (mp = 0; mp < num_maps; mp++) {
-		u32 req_mask = 0;
-		u32 lpm_status;
-		int mode, idx, i, len = 32;
-
-		/*
-		 * Capture the requirements and create a mask so that we only
-		 * show an element if it's required for at least one of the
-		 * enabled low power modes
-		 */
-		pmc_for_each_mode(idx, mode, pmcdev)
-			req_mask |= lpm_req_regs[mp + (mode * num_maps)];
-
-		/* Get the last latched status for this map */
-		lpm_status = pmc_core_reg_read(pmc, sts_offset + (mp * 4));
-
-		/*  Loop over elements in this map */
-		map = maps[mp];
-		for (i = 0; map[i].name && i < len; i++) {
-			u32 bit_mask = map[i].bit_mask;
-
-			if (!(bit_mask & req_mask))
-				/*
-				 * Not required for any enabled states
-				 * so don't display
-				 */
-				continue;
-
-			/* Display the element name in the first column */
-			seq_printf(s, "%30s |", map[i].name);
-
-			/* Loop over the enabled states and display if required */
-			pmc_for_each_mode(idx, mode, pmcdev) {
-				if (lpm_req_regs[mp + (mode * num_maps)] & bit_mask)
-					seq_printf(s, " %9s |",
-						   "Required");
-				else
-					seq_printf(s, " %9s |", " ");
+	u32 sts_offset;
+	u32 *lpm_req_regs;
+	int num_maps, mp, pmc_index;
+
+	for (pmc_index = 0; pmc_index < ARRAY_SIZE(pmcdev->pmcs); ++pmc_index) {
+		struct pmc *pmc = pmcdev->pmcs[pmc_index];
+		const struct pmc_bit_map **maps;
+
+		if (!pmc)
+			continue;
+
+		maps = pmc->map->lpm_sts;
+		num_maps = pmc->map->lpm_num_maps;
+		sts_offset = pmc->map->lpm_status_offset;
+		lpm_req_regs = pmc->lpm_req_regs;
+
+		if (!lpm_req_regs)
+			continue;
+
+		/* Display the header */
+		pmc_core_substate_req_header_show(s, pmc_index);
+
+		/* Loop over maps */
+		for (mp = 0; mp < num_maps; mp++) {
+			u32 req_mask = 0;
+			u32 lpm_status;
+			const struct pmc_bit_map *map;
+			int mode, idx, i, len = 32;
+
+			/*
+			 * Capture the requirements and create a mask so that we only
+			 * show an element if it's required for at least one of the
+			 * enabled low power modes
+			 */
+			pmc_for_each_mode(idx, mode, pmcdev)
+				req_mask |= lpm_req_regs[mp + (mode * num_maps)];
+
+			/* Get the last latched status for this map */
+			lpm_status = pmc_core_reg_read(pmc, sts_offset + (mp * 4));
+
+			/*  Loop over elements in this map */
+			map = maps[mp];
+			for (i = 0; map[i].name && i < len; i++) {
+				u32 bit_mask = map[i].bit_mask;
+
+				if (!(bit_mask & req_mask)) {
+					/*
+					 * Not required for any enabled states
+					 * so don't display
+					 */
+					continue;
+				}
+
+				/* Display the element name in the first column */
+				seq_printf(s, "pmc%d: %26s |", pmc_index, map[i].name);
+
+				/* Loop over the enabled states and display if required */
+				pmc_for_each_mode(idx, mode, pmcdev) {
+					bool required = lpm_req_regs[mp + (mode * num_maps)] &
+							bit_mask;
+					seq_printf(s, " %9s |", required ? "Required" : " ");
+				}
+
+				/* In Status column, show the last captured state of this agent */
+				seq_printf(s, " %9s |", lpm_status & bit_mask ? "Yes" : " ");
+
+				seq_puts(s, "\n");
 			}
-
-			/* In Status column, show the last captured state of this agent */
-			if (lpm_status & bit_mask)
-				seq_printf(s, " %9s |", "Yes");
-			else
-				seq_printf(s, " %9s |", " ");
-
-			seq_puts(s, "\n");
 		}
 	}
-
 	return 0;
 }
 DEFINE_SHOW_ATTRIBUTE(pmc_core_substate_req_regs);
-- 
2.34.1

[PATCH V5 17/20] platform/x86/intel/pmc: Retrieve LPM information using Intel PMT

[David E. Box]

From: Xi Pardee <xi.pardee@intel.com>

On supported platforms, the low power mode (LPM) requirements for entering
each idle substate are described in Platform Monitoring Technology (PMT)
telemetry entries. Provide a function for platform code to attempt to find
and read the requirements from the telemetry entries.

Signed-off-by: Xi Pardee <xi.pardee@intel.com>
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
V5 - no change

V4 - no change

V3 - no change

V2 - remove extra parens

 drivers/platform/x86/intel/pmc/core.h       |   3 +
 drivers/platform/x86/intel/pmc/core_ssram.c | 135 ++++++++++++++++++++
 2 files changed, 138 insertions(+)

diff --git a/drivers/platform/x86/intel/pmc/core.h b/drivers/platform/x86/intel/pmc/core.h
index edaa70067e41..85b6f6ae4995 100644
--- a/drivers/platform/x86/intel/pmc/core.h
+++ b/drivers/platform/x86/intel/pmc/core.h
@@ -320,6 +320,7 @@ struct pmc_reg_map {
 	const u32 lpm_status_offset;
 	const u32 lpm_live_status_offset;
 	const u32 etr3_offset;
+	const u8  *lpm_reg_index;
 };
 
 /**
@@ -329,6 +330,7 @@ struct pmc_reg_map {
  *			specific attributes
  */
 struct pmc_info {
+	u32 guid;
 	u16 devid;
 	const struct pmc_reg_map *map;
 };
@@ -486,6 +488,7 @@ extern const struct pmc_bit_map *mtl_ioem_lpm_maps[];
 extern const struct pmc_reg_map mtl_ioem_reg_map;
 
 extern void pmc_core_get_tgl_lpm_reqs(struct platform_device *pdev);
+extern int pmc_core_ssram_get_lpm_reqs(struct pmc_dev *pmcdev);
 extern int pmc_core_send_ltr_ignore(struct pmc_dev *pmcdev, u32 value);
 
 int pmc_core_resume_common(struct pmc_dev *pmcdev);
diff --git a/drivers/platform/x86/intel/pmc/core_ssram.c b/drivers/platform/x86/intel/pmc/core_ssram.c
index a18e3a2e90fe..f9819fa01707 100644
--- a/drivers/platform/x86/intel/pmc/core_ssram.c
+++ b/drivers/platform/x86/intel/pmc/core_ssram.c
@@ -24,6 +24,140 @@
 #define SSRAM_IOE_OFFSET	0x68
 #define SSRAM_DEVID_OFFSET	0x70
 
+/* PCH query */
+#define LPM_HEADER_OFFSET	1
+#define LPM_REG_COUNT		28
+#define LPM_MODE_OFFSET		1
+
+static u32 pmc_core_find_guid(struct pmc_info *list, const struct pmc_reg_map *map)
+{
+	for (; list->map; ++list)
+		if (list->map == map)
+			return list->guid;
+
+	return 0;
+}
+
+static int pmc_core_get_lpm_req(struct pmc_dev *pmcdev, struct pmc *pmc)
+{
+	struct telem_endpoint *ep;
+	const u8 *lpm_indices;
+	int num_maps, mode_offset = 0;
+	int ret, mode, i;
+	int lpm_size;
+	u32 guid;
+
+	lpm_indices = pmc->map->lpm_reg_index;
+	num_maps = pmc->map->lpm_num_maps;
+	lpm_size = LPM_MAX_NUM_MODES * num_maps;
+
+	guid = pmc_core_find_guid(pmcdev->regmap_list, pmc->map);
+	if (!guid)
+		return -ENXIO;
+
+	ep = pmt_telem_find_and_register_endpoint(pmcdev->ssram_pcidev, guid, 0);
+	if (IS_ERR(ep)) {
+		dev_dbg(&pmcdev->pdev->dev, "couldn't get telem endpoint %ld",
+			PTR_ERR(ep));
+		return -EPROBE_DEFER;
+	}
+
+	pmc->lpm_req_regs = devm_kzalloc(&pmcdev->pdev->dev,
+					 lpm_size * sizeof(u32),
+					 GFP_KERNEL);
+	if (!pmc->lpm_req_regs) {
+		ret = -ENOMEM;
+		goto unregister_ep;
+	}
+
+	/*
+	 * PMC Low Power Mode (LPM) table
+	 *
+	 * In telemetry space, the LPM table contains a 4 byte header followed
+	 * by 8 consecutive mode blocks (one for each LPM mode). Each block
+	 * has a 4 byte header followed by a set of registers that describe the
+	 * IP state requirements for the given mode. The IP mapping is platform
+	 * specific but the same for each block, making for easy analysis.
+	 * Platforms only use a subset of the space to track the requirements
+	 * for their IPs. Callers provide the requirement registers they use as
+	 * a list of indices. Each requirement register is associated with an
+	 * IP map that's maintained by the caller.
+	 *
+	 * Header
+	 * +----+----------------------------+----------------------------+
+	 * |  0 |      REVISION              |      ENABLED MODES         |
+	 * +----+--------------+-------------+-------------+--------------+
+	 *
+	 * Low Power Mode 0 Block
+	 * +----+--------------+-------------+-------------+--------------+
+	 * |  1 |     SUB ID   |     SIZE    |   MAJOR     |   MINOR      |
+	 * +----+--------------+-------------+-------------+--------------+
+	 * |  2 |           LPM0 Requirements 0                           |
+	 * +----+---------------------------------------------------------+
+	 * |    |                  ...                                    |
+	 * +----+---------------------------------------------------------+
+	 * | 29 |           LPM0 Requirements 27                          |
+	 * +----+---------------------------------------------------------+
+	 *
+	 * ...
+	 *
+	 * Low Power Mode 7 Block
+	 * +----+--------------+-------------+-------------+--------------+
+	 * |    |     SUB ID   |     SIZE    |   MAJOR     |   MINOR      |
+	 * +----+--------------+-------------+-------------+--------------+
+	 * | 60 |           LPM7 Requirements 0                           |
+	 * +----+---------------------------------------------------------+
+	 * |    |                  ...                                    |
+	 * +----+---------------------------------------------------------+
+	 * | 87 |           LPM7 Requirements 27                          |
+	 * +----+---------------------------------------------------------+
+	 *
+	 */
+	mode_offset = LPM_HEADER_OFFSET + LPM_MODE_OFFSET;
+	pmc_for_each_mode(i, mode, pmcdev) {
+		u32 *req_offset = pmc->lpm_req_regs + (mode * num_maps);
+		int m;
+
+		for (m = 0; m < num_maps; m++) {
+			u8 sample_id = lpm_indices[m] + mode_offset;
+
+			ret = pmt_telem_read32(ep, sample_id, req_offset, 1);
+			if (ret) {
+				dev_err(&pmcdev->pdev->dev,
+					"couldn't read Low Power Mode requirements: %d\n", ret);
+				devm_kfree(&pmcdev->pdev->dev, pmc->lpm_req_regs);
+				goto unregister_ep;
+			}
+			++req_offset;
+		}
+		mode_offset += LPM_REG_COUNT + LPM_MODE_OFFSET;
+	}
+
+unregister_ep:
+	pmt_telem_unregister_endpoint(ep);
+
+	return ret;
+}
+
+int pmc_core_ssram_get_lpm_reqs(struct pmc_dev *pmcdev)
+{
+	int ret, i;
+
+	if (!pmcdev->ssram_pcidev)
+		return -ENODEV;
+
+	for (i = 0; i < ARRAY_SIZE(pmcdev->pmcs); ++i) {
+		if (!pmcdev->pmcs[i])
+			continue;
+
+		ret = pmc_core_get_lpm_req(pmcdev, pmcdev->pmcs[i]);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 static void
 pmc_add_pmt(struct pmc_dev *pmcdev, u64 ssram_base, void __iomem *ssram)
 {
@@ -187,3 +321,4 @@ int pmc_core_ssram_init(struct pmc_dev *pmcdev)
 	return ret;
 }
 MODULE_IMPORT_NS(INTEL_VSEC);
+MODULE_IMPORT_NS(INTEL_PMT_TELEMETRY);
-- 
2.34.1

[PATCH V5 18/20] platform/x86/intel/pmc: Read low power mode requirements for MTL-M and MTL-P

[David E. Box]

From: Xi Pardee <xi.pardee@intel.com>

Add support to read the low power mode requirements for Meteor Lake M and
Meteor Lake P.

Signed-off-by: Xi Pardee <xi.pardee@intel.com>
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
V5 - no change

V4 - no change

V3 - directly return value from pmc_core_ssram_get_lpm_reqs()

V2 - fixed unused return value

 drivers/platform/x86/intel/pmc/mtl.c | 39 +++++++++++++++++++++++-----
 1 file changed, 32 insertions(+), 7 deletions(-)

diff --git a/drivers/platform/x86/intel/pmc/mtl.c b/drivers/platform/x86/intel/pmc/mtl.c
index d1d3d33fb4b8..7ceeae507f4c 100644
--- a/drivers/platform/x86/intel/pmc/mtl.c
+++ b/drivers/platform/x86/intel/pmc/mtl.c
@@ -11,6 +11,13 @@
 #include <linux/pci.h>
 #include "core.h"
 
+/* PMC SSRAM PMT Telemetry GUIDS */
+#define SOCP_LPM_REQ_GUID	0x2625030
+#define IOEM_LPM_REQ_GUID	0x4357464
+#define IOEP_LPM_REQ_GUID	0x5077612
+
+static const u8 MTL_LPM_REG_INDEX[] = {0, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20};
+
 /*
  * Die Mapping to Product.
  * Product SOCDie IOEDie PCHDie
@@ -465,6 +472,7 @@ const struct pmc_reg_map mtl_socm_reg_map = {
 	.lpm_sts = mtl_socm_lpm_maps,
 	.lpm_status_offset = MTL_LPM_STATUS_OFFSET,
 	.lpm_live_status_offset = MTL_LPM_LIVE_STATUS_OFFSET,
+	.lpm_reg_index = MTL_LPM_REG_INDEX,
 };
 
 const struct pmc_bit_map mtl_ioep_pfear_map[] = {
@@ -782,6 +790,13 @@ const struct pmc_reg_map mtl_ioep_reg_map = {
 	.ltr_show_sts = mtl_ioep_ltr_show_map,
 	.ltr_ignore_offset = CNP_PMC_LTR_IGNORE_OFFSET,
 	.ltr_ignore_max = ADL_NUM_IP_IGN_ALLOWED,
+	.lpm_num_maps = ADL_LPM_NUM_MAPS,
+	.lpm_res_counter_step_x2 = TGL_PMC_LPM_RES_COUNTER_STEP_X2,
+	.lpm_residency_offset = MTL_LPM_RESIDENCY_OFFSET,
+	.lpm_priority_offset = MTL_LPM_PRI_OFFSET,
+	.lpm_en_offset = MTL_LPM_EN_OFFSET,
+	.lpm_sts_latch_en_offset = MTL_LPM_STATUS_LATCH_EN_OFFSET,
+	.lpm_reg_index = MTL_LPM_REG_INDEX,
 };
 
 const struct pmc_bit_map mtl_ioem_pfear_map[] = {
@@ -922,6 +937,13 @@ const struct pmc_reg_map mtl_ioem_reg_map = {
 	.ltr_show_sts = mtl_ioep_ltr_show_map,
 	.ltr_ignore_offset = CNP_PMC_LTR_IGNORE_OFFSET,
 	.ltr_ignore_max = ADL_NUM_IP_IGN_ALLOWED,
+	.lpm_sts_latch_en_offset = MTL_LPM_STATUS_LATCH_EN_OFFSET,
+	.lpm_num_maps = ADL_LPM_NUM_MAPS,
+	.lpm_priority_offset = MTL_LPM_PRI_OFFSET,
+	.lpm_en_offset = MTL_LPM_EN_OFFSET,
+	.lpm_res_counter_step_x2 = TGL_PMC_LPM_RES_COUNTER_STEP_X2,
+	.lpm_residency_offset = MTL_LPM_RESIDENCY_OFFSET,
+	.lpm_reg_index = MTL_LPM_REG_INDEX,
 };
 
 #define PMC_DEVID_SOCM	0x7e7f
@@ -929,16 +951,19 @@ const struct pmc_reg_map mtl_ioem_reg_map = {
 #define PMC_DEVID_IOEM	0x7ebf
 static struct pmc_info mtl_pmc_info_list[] = {
 	{
-		.devid = PMC_DEVID_SOCM,
-		.map = &mtl_socm_reg_map,
+		.guid	= SOCP_LPM_REQ_GUID,
+		.devid	= PMC_DEVID_SOCM,
+		.map	= &mtl_socm_reg_map,
 	},
 	{
-		.devid = PMC_DEVID_IOEP,
-		.map = &mtl_ioep_reg_map,
+		.guid	= IOEP_LPM_REQ_GUID,
+		.devid	= PMC_DEVID_IOEP,
+		.map	= &mtl_ioep_reg_map,
 	},
 	{
-		.devid = PMC_DEVID_IOEM,
-		.map = &mtl_ioem_reg_map
+		.guid	= IOEM_LPM_REQ_GUID,
+		.devid	= PMC_DEVID_IOEM,
+		.map	= &mtl_ioem_reg_map
 	},
 	{}
 };
@@ -1014,5 +1039,5 @@ int mtl_core_init(struct pmc_dev *pmcdev)
 	dev_dbg(&pmcdev->pdev->dev, "ignoring GBE LTR\n");
 	pmc_core_send_ltr_ignore(pmcdev, 3);
 
-	return 0;
+	return pmc_core_ssram_get_lpm_reqs(pmcdev);
 }
-- 
2.34.1

[PATCH V5 19/20] platform/x86/intel/pmc: Add debug attribute for Die C6 counter

[David E. Box]

Add a "die_c6_us_show" debugfs attribute.  Reads the counter value using
Intel Platform Monitoring Technology (PMT) driver API. This counter is
useful for determining the idle residency of CPUs in the compute tile.
Also adds a missing forward declaration for punit_ep which was declared in
an earlier upstream commit but only used for the first time in this one.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
---
V5 - Change comment for crystal error and return value

V4 - no change

V3 - Split previous PATCH V2 13. Separates implementation (this patch) from
     platform specific use (next patch)

V2 - Remove use of __func__
   - Use HZ_PER_MHZ
   - Fix missing newlines in printks

 drivers/platform/x86/intel/pmc/core.c | 55 +++++++++++++++++++++++++++
 drivers/platform/x86/intel/pmc/core.h |  4 ++
 2 files changed, 59 insertions(+)

diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
index 4a38d52558fd..fb2c84fba0ae 100644
--- a/drivers/platform/x86/intel/pmc/core.c
+++ b/drivers/platform/x86/intel/pmc/core.c
@@ -20,6 +20,7 @@
 #include <linux/pci.h>
 #include <linux/slab.h>
 #include <linux/suspend.h>
+#include <linux/units.h>
 
 #include <asm/cpu_device_id.h>
 #include <asm/intel-family.h>
@@ -27,6 +28,7 @@
 #include <asm/tsc.h>
 
 #include "core.h"
+#include "../pmt/telemetry.h"
 
 /* Maximum number of modes supported by platfoms that has low power mode capability */
 const char *pmc_lpm_modes[] = {
@@ -817,6 +819,47 @@ static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused)
 }
 DEFINE_SHOW_ATTRIBUTE(pmc_core_substate_req_regs);
 
+static unsigned int pmc_core_get_crystal_freq(void)
+{
+	unsigned int eax_denominator, ebx_numerator, ecx_hz, edx;
+
+	if (boot_cpu_data.cpuid_level < 0x15)
+		return 0;
+
+	eax_denominator = ebx_numerator = ecx_hz = edx = 0;
+
+	/* CPUID 15H TSC/Crystal ratio, plus optionally Crystal Hz */
+	cpuid(0x15, &eax_denominator, &ebx_numerator, &ecx_hz, &edx);
+
+	if (ebx_numerator == 0 || eax_denominator == 0)
+		return 0;
+
+	return ecx_hz;
+}
+
+static int pmc_core_die_c6_us_show(struct seq_file *s, void *unused)
+{
+	struct pmc_dev *pmcdev = s->private;
+	u64 die_c6_res, count;
+	int ret;
+
+	if (!pmcdev->crystal_freq) {
+		dev_warn_once(&pmcdev->pdev->dev, "Crystal frequency unavailable\n");
+		return -ENXIO;
+	}
+
+	ret = pmt_telem_read(pmcdev->punit_ep, pmcdev->die_c6_offset,
+			     &count, 1);
+	if (ret)
+		return ret;
+
+	die_c6_res = div64_u64(count * HZ_PER_MHZ, pmcdev->crystal_freq);
+	seq_printf(s, "%llu\n", die_c6_res);
+
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(pmc_core_die_c6_us);
+
 static int pmc_core_lpm_latch_mode_show(struct seq_file *s, void *unused)
 {
 	struct pmc_dev *pmcdev = s->private;
@@ -1113,6 +1156,12 @@ static void pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
 				    pmcdev->dbgfs_dir, pmcdev,
 				    &pmc_core_substate_req_regs_fops);
 	}
+
+	if (pmcdev->has_die_c6) {
+		debugfs_create_file("die_c6_us_show", 0444,
+				    pmcdev->dbgfs_dir, pmcdev,
+				    &pmc_core_die_c6_us_fops);
+	}
 }
 
 static const struct x86_cpu_id intel_pmc_core_ids[] = {
@@ -1207,6 +1256,10 @@ static void pmc_core_clean_structure(struct platform_device *pdev)
 		pci_dev_put(pmcdev->ssram_pcidev);
 		pci_disable_device(pmcdev->ssram_pcidev);
 	}
+
+	if (pmcdev->punit_ep)
+		pmt_telem_unregister_endpoint(pmcdev->punit_ep);
+
 	platform_set_drvdata(pdev, NULL);
 	mutex_destroy(&pmcdev->lock);
 }
@@ -1227,6 +1280,8 @@ static int pmc_core_probe(struct platform_device *pdev)
 	if (!pmcdev)
 		return -ENOMEM;
 
+	pmcdev->crystal_freq = pmc_core_get_crystal_freq();
+
 	platform_set_drvdata(pdev, pmcdev);
 	pmcdev->pdev = pdev;
 
diff --git a/drivers/platform/x86/intel/pmc/core.h b/drivers/platform/x86/intel/pmc/core.h
index 85b6f6ae4995..6d7673145f90 100644
--- a/drivers/platform/x86/intel/pmc/core.h
+++ b/drivers/platform/x86/intel/pmc/core.h
@@ -16,6 +16,8 @@
 #include <linux/bits.h>
 #include <linux/platform_device.h>
 
+struct telem_endpoint;
+
 #define SLP_S0_RES_COUNTER_MASK			GENMASK(31, 0)
 
 #define PMC_BASE_ADDR_DEFAULT			0xFE000000
@@ -357,6 +359,7 @@ struct pmc {
  * @devs:		pointer to an array of pmc pointers
  * @pdev:		pointer to platform_device struct
  * @ssram_pcidev:	pointer to pci device struct for the PMC SSRAM
+ * @crystal_freq:	crystal frequency from cpuid
  * @dbgfs_dir:		path to debugfs interface
  * @pmc_xram_read_bit:	flag to indicate whether PMC XRAM shadow registers
  *			used to read MPHY PG and PLL status are available
@@ -374,6 +377,7 @@ struct pmc_dev {
 	struct dentry *dbgfs_dir;
 	struct platform_device *pdev;
 	struct pci_dev *ssram_pcidev;
+	unsigned int crystal_freq;
 	int pmc_xram_read_bit;
 	struct mutex lock; /* generic mutex lock for PMC Core */
 
-- 
2.34.1

[PATCH V5 20/20] platform/x86/intel/pmc: Show Die C6 counter on Meteor Lake

[David E. Box]

Expose the Die C6 counter on Meteor Lake.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
V5 - no change

V4 - no change

V3 - Split PATCH V2 13. Separates implementation (previous patch)
     from platform specific use (this patch)

 drivers/platform/x86/intel/pmc/mtl.c | 32 ++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/platform/x86/intel/pmc/mtl.c b/drivers/platform/x86/intel/pmc/mtl.c
index 7ceeae507f4c..38c2f946ec23 100644
--- a/drivers/platform/x86/intel/pmc/mtl.c
+++ b/drivers/platform/x86/intel/pmc/mtl.c
@@ -10,12 +10,17 @@
 
 #include <linux/pci.h>
 #include "core.h"
+#include "../pmt/telemetry.h"
 
 /* PMC SSRAM PMT Telemetry GUIDS */
 #define SOCP_LPM_REQ_GUID	0x2625030
 #define IOEM_LPM_REQ_GUID	0x4357464
 #define IOEP_LPM_REQ_GUID	0x5077612
 
+/* Die C6 from PUNIT telemetry */
+#define MTL_PMT_DMU_DIE_C6_OFFSET	15
+#define MTL_PMT_DMU_GUID		0x1A067102
+
 static const u8 MTL_LPM_REG_INDEX[] = {0, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20};
 
 /*
@@ -968,6 +973,32 @@ static struct pmc_info mtl_pmc_info_list[] = {
 	{}
 };
 
+static void mtl_punit_pmt_init(struct pmc_dev *pmcdev)
+{
+	struct telem_endpoint *ep;
+	struct pci_dev *pcidev;
+
+	pcidev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(10, 0));
+	if (!pcidev) {
+		dev_err(&pmcdev->pdev->dev, "PUNIT PMT device not found.\n");
+		return;
+	}
+
+	ep = pmt_telem_find_and_register_endpoint(pcidev, MTL_PMT_DMU_GUID, 0);
+	if (IS_ERR(ep)) {
+		dev_err(&pmcdev->pdev->dev,
+			"pmc_core: couldn't get DMU telem endpoint, %ld\n",
+			PTR_ERR(ep));
+		return;
+	}
+
+	pci_dev_put(pcidev);
+	pmcdev->punit_ep = ep;
+
+	pmcdev->has_die_c6 = true;
+	pmcdev->die_c6_offset = MTL_PMT_DMU_DIE_C6_OFFSET;
+}
+
 #define MTL_GNA_PCI_DEV	0x7e4c
 #define MTL_IPU_PCI_DEV	0x7d19
 #define MTL_VPU_PCI_DEV	0x7d1d
@@ -1032,6 +1063,7 @@ int mtl_core_init(struct pmc_dev *pmcdev)
 	}
 
 	pmc_core_get_low_power_modes(pmcdev);
+	mtl_punit_pmt_init(pmcdev);
 
 	/* Due to a hardware limitation, the GBE LTR blocks PC10
 	 * when a cable is attached. Tell the PMC to ignore it.
-- 
2.34.1

Re: [PATCH V5 01/20] platform/x86/intel/vsec: Fix xa_alloc memory leak

[Ilpo Järvinen]

On Wed, 22 Nov 2023, David E. Box wrote:

> Fixes memory leak, caught be kmemleak, due to failure to erase auxiliary
> device entries from an xarray on removal.
> 
> Signed-off-by: David E. Box <david.e.box@linux.intel.com>

Changelog is quite terse, please improve ;-).

Missing Fixes tag.

> ---
> V5 - New patch
> 
>  drivers/platform/x86/intel/vsec.c | 24 ++++++++++++++++--------
>  drivers/platform/x86/intel/vsec.h |  1 +
>  2 files changed, 17 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
> index c1f9e4471b28..ae811bb65910 100644
> --- a/drivers/platform/x86/intel/vsec.c
> +++ b/drivers/platform/x86/intel/vsec.c
> @@ -120,6 +120,8 @@ static void intel_vsec_dev_release(struct device *dev)
>  {
>  	struct intel_vsec_device *intel_vsec_dev = dev_to_ivdev(dev);
>  
> +	xa_erase(&auxdev_array, intel_vsec_dev->id);
> +
>  	mutex_lock(&vsec_ida_lock);
>  	ida_free(intel_vsec_dev->ida, intel_vsec_dev->auxdev.id);
>  	mutex_unlock(&vsec_ida_lock);
> @@ -136,9 +138,21 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
>  	int ret, id;
>  
>  	mutex_lock(&vsec_ida_lock);
> -	ret = ida_alloc(intel_vsec_dev->ida, GFP_KERNEL);
> +	id = ida_alloc(intel_vsec_dev->ida, GFP_KERNEL);
>  	mutex_unlock(&vsec_ida_lock);
> +	if (id < 0) {
> +		kfree(intel_vsec_dev->resource);
> +		kfree(intel_vsec_dev);
> +		return ret;
> +	}
> +
> +	ret = xa_alloc(&auxdev_array, &intel_vsec_dev->id, intel_vsec_dev,
> +		       PMT_XA_LIMIT, GFP_KERNEL);
>  	if (ret < 0) {
> +		mutex_lock(&vsec_ida_lock);
> +		ida_free(intel_vsec_dev->ida, id);
> +		mutex_unlock(&vsec_ida_lock);

Can't order of xa_alloc() and ida_alloc() be reversed such that you don't 
need to do this double mutex dance?

-- 
 i.

> +
>  		kfree(intel_vsec_dev->resource);
>  		kfree(intel_vsec_dev);
>  		return ret;
> @@ -147,7 +161,7 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
>  	if (!parent)
>  		parent = &pdev->dev;
>  
> -	auxdev->id = ret;
> +	auxdev->id = id;
>  	auxdev->name = name;
>  	auxdev->dev.parent = parent;
>  	auxdev->dev.release = intel_vsec_dev_release;
> @@ -169,12 +183,6 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
>  	if (ret < 0)
>  		return ret;
>  
> -	/* Add auxdev to list */
> -	ret = xa_alloc(&auxdev_array, &id, intel_vsec_dev, PMT_XA_LIMIT,
> -		       GFP_KERNEL);
> -	if (ret)
> -		return ret;
> -
>  	return 0;
>  }
>  EXPORT_SYMBOL_NS_GPL(intel_vsec_add_aux, INTEL_VSEC);
> diff --git a/drivers/platform/x86/intel/vsec.h b/drivers/platform/x86/intel/vsec.h
> index 0fd042c171ba..0a6201b4a0e9 100644
> --- a/drivers/platform/x86/intel/vsec.h
> +++ b/drivers/platform/x86/intel/vsec.h
> @@ -45,6 +45,7 @@ struct intel_vsec_device {
>  	struct ida *ida;
>  	struct intel_vsec_platform_info *info;
>  	int num_resources;
> +	int id; /* xa */
>  	void *priv_data;
>  	size_t priv_data_size;
>  };
> 

Re: [PATCH V5 05/20] platform/x86/intel/vsec: Assign auxdev parent by argument

[Ilpo Järvinen]

[-- Attachment #1: Type: text/plain, Size: 1753 bytes --]

On Wed, 22 Nov 2023, David E. Box wrote:

> Instead of checking for a NULL parent argument in intel_vsec_add_aux() and
> then assigning it to the probed device, remove this check and just pass the
> device in the call. Since this function is exported, return -EINVAL if the
> parent is not specified.
> 
> Signed-off-by: David E. Box <david.e.box@linux.intel.com>
> ---
> V5 - New patch
> 
>  drivers/platform/x86/intel/vsec.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
> index 7dc3650f2757..7a717183c58b 100644
> --- a/drivers/platform/x86/intel/vsec.c
> +++ b/drivers/platform/x86/intel/vsec.c
> @@ -103,6 +103,9 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
>  	struct auxiliary_device *auxdev = &intel_vsec_dev->auxdev;
>  	int ret, id;
>  
> +	if (!parent)
> +		return -EINVAL;
> +
>  	mutex_lock(&vsec_ida_lock);
>  	id = ida_alloc(intel_vsec_dev->ida, GFP_KERNEL);
>  	mutex_unlock(&vsec_ida_lock);
> @@ -124,9 +127,6 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
>  		return ret;
>  	}
>  
> -	if (!parent)
> -		parent = &pdev->dev;
> -
>  	auxdev->id = id;
>  	auxdev->name = name;
>  	auxdev->dev.parent = parent;
> @@ -212,7 +212,7 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
>  	 * Pass the ownership of intel_vsec_dev and resource within it to
>  	 * intel_vsec_add_aux()
>  	 */
> -	return intel_vsec_add_aux(pdev, NULL, no_free_ptr(intel_vsec_dev),
> +	return intel_vsec_add_aux(pdev, &pdev->dev, no_free_ptr(intel_vsec_dev),
>  				  intel_vsec_name(header->id));
>  }

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

-- 
 i.

Re: [PATCH V5 19/20] platform/x86/intel/pmc: Add debug attribute for Die C6 counter

[Ilpo Järvinen]

On Wed, 22 Nov 2023, David E. Box wrote:

> Add a "die_c6_us_show" debugfs attribute.  Reads the counter value using
> Intel Platform Monitoring Technology (PMT) driver API. This counter is
> useful for determining the idle residency of CPUs in the compute tile.
> Also adds a missing forward declaration for punit_ep which was declared in
> an earlier upstream commit but only used for the first time in this one.
> 
> Signed-off-by: David E. Box <david.e.box@linux.intel.com>
> ---
> V5 - Change comment for crystal error and return value
> 
> V4 - no change
> 
> V3 - Split previous PATCH V2 13. Separates implementation (this patch) from
>      platform specific use (next patch)
> 
> V2 - Remove use of __func__
>    - Use HZ_PER_MHZ
>    - Fix missing newlines in printks
> 
>  drivers/platform/x86/intel/pmc/core.c | 55 +++++++++++++++++++++++++++
>  drivers/platform/x86/intel/pmc/core.h |  4 ++
>  2 files changed, 59 insertions(+)
> 
> diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
> index 4a38d52558fd..fb2c84fba0ae 100644
> --- a/drivers/platform/x86/intel/pmc/core.c
> +++ b/drivers/platform/x86/intel/pmc/core.c

> +static int pmc_core_die_c6_us_show(struct seq_file *s, void *unused)
> +{
> +	struct pmc_dev *pmcdev = s->private;
> +	u64 die_c6_res, count;
> +	int ret;
> +
> +	if (!pmcdev->crystal_freq) {
> +		dev_warn_once(&pmcdev->pdev->dev, "Crystal frequency unavailable\n");
> +		return -ENXIO;
> +	}

I actually started to wonder whether it would be better to just not show 
the file in this case (using .is_visible())? (I'm sorry I forgot to send 
the note about that earlier.)

-- 
 i.

Re: [PATCH V5 19/20] platform/x86/intel/pmc: Add debug attribute for Die C6 counter

[Ilpo Järvinen]

[-- Attachment #1: Type: text/plain, Size: 1962 bytes --]

On Thu, 23 Nov 2023, Ilpo Järvinen wrote:

> On Wed, 22 Nov 2023, David E. Box wrote:
> 
> > Add a "die_c6_us_show" debugfs attribute.  Reads the counter value using
> > Intel Platform Monitoring Technology (PMT) driver API. This counter is
> > useful for determining the idle residency of CPUs in the compute tile.
> > Also adds a missing forward declaration for punit_ep which was declared in
> > an earlier upstream commit but only used for the first time in this one.
> > 
> > Signed-off-by: David E. Box <david.e.box@linux.intel.com>
> > ---
> > V5 - Change comment for crystal error and return value
> > 
> > V4 - no change
> > 
> > V3 - Split previous PATCH V2 13. Separates implementation (this patch) from
> >      platform specific use (next patch)
> > 
> > V2 - Remove use of __func__
> >    - Use HZ_PER_MHZ
> >    - Fix missing newlines in printks
> > 
> >  drivers/platform/x86/intel/pmc/core.c | 55 +++++++++++++++++++++++++++
> >  drivers/platform/x86/intel/pmc/core.h |  4 ++
> >  2 files changed, 59 insertions(+)
> > 
> > diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
> > index 4a38d52558fd..fb2c84fba0ae 100644
> > --- a/drivers/platform/x86/intel/pmc/core.c
> > +++ b/drivers/platform/x86/intel/pmc/core.c
> 
> > +static int pmc_core_die_c6_us_show(struct seq_file *s, void *unused)
> > +{
> > +	struct pmc_dev *pmcdev = s->private;
> > +	u64 die_c6_res, count;
> > +	int ret;
> > +
> > +	if (!pmcdev->crystal_freq) {
> > +		dev_warn_once(&pmcdev->pdev->dev, "Crystal frequency unavailable\n");
> > +		return -ENXIO;
> > +	}
> 
> I actually started to wonder whether it would be better to just not show 
> the file in this case (using .is_visible())? (I'm sorry I forgot to send 
> the note about that earlier.)

Ah, sorry, this was actually a debugfs file, not a sysfs one (and that's 
why I didn't end up noting it earlier).

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

-- 
 i.

Re: [PATCH V5 16/20] platform/x86/intel/pmc: Display LPM requirements for multiple PMCs

[Ilpo Järvinen]

[-- Attachment #1: Type: text/plain, Size: 1009 bytes --]

On Wed, 22 Nov 2023, David E. Box wrote:

> From: Rajvi Jingar <rajvi.jingar@linux.intel.com>
> 
> Update the substate_requirements attribute to display the requirements for
> all the PMCs on a package.
> 
> Signed-off-by: Rajvi Jingar <rajvi.jingar@linux.intel.com>
> Signed-off-by: David E. Box <david.e.box@linux.intel.com>
> ---

This change looked fine.

However, I spent considerable time in figuring out the addition of 
lpm_req_regs NULL check so it would be nice to mention it in the commit 
message that since the caller's primary_pmc->lpm_req_regs check no longer 
covers all pmcs, it has to checked within the loop. It's was far from 
obvious whether it was a bugfix accidently mixed together with this patch 
or required by this change itself but I managed to finally convince 
myself it's the latter.

With that noted down for the benefit of the next unfortunate victim who 
has to read this change from the git history, :-)

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


-- 
 i.

Re: [PATCH V5 13/20] platform/x86/intel/pmc: Cleanup SSRAM discovery

[Ilpo Järvinen]

[-- Attachment #1: Type: text/plain, Size: 537 bytes --]

On Wed, 22 Nov 2023, David E. Box wrote:

> Clean up the code handling SSRAM discovery. Handle all resource allocation
> and cleanup in pmc_core_ssram_get_pmc(). Return the error status from this
> function but only fail the init if we fail to discover the primary PMC.
> 
> Signed-off-by: David E. Box <david.e.box@linux.intel.com>

Very easy to follow, thanks for making it this way (in fact so easy
I started to doubt my eyes as I didn't find any flaws in it :-)).

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

-- 
 i.

Re: [PATCH V5 14/20] platform/x86/intel/pmc/mtl: Use return value from pmc_core_ssram_init()

[Ilpo Järvinen]

[-- Attachment #1: Type: text/plain, Size: 392 bytes --]

On Wed, 22 Nov 2023, David E. Box wrote:

> Instead of checking for a NULL regbase, use the return value from
> pmc_core_ssram_init() to check if PMC discovery was successful. If not, use
> the legacy enumeration method (which only works for the primary PMC).
> 
> Signed-off-by: David E. Box <david.e.box@linux.intel.com>

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

-- 
 i.

Re: [PATCH V5 12/20] asm-generic/io.h: iounmap/ioport_unmap cleanup.h support

[Ilpo Järvinen]

[-- Attachment #1: Type: text/plain, Size: 1902 bytes --]

On Wed, 22 Nov 2023, David E. Box wrote:

> Add auto-release cleanups for iounmap() and ioport_unmap().
> 
> Signed-off-by: David E. Box <david.e.box@linux.intel.com>
> Suggested-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
> ---
> V2 - Move from linux/io.h to asm-generic/io.h. Adds iounmap cleanup if
>      iounmap() is defined. Adds ioport_unmap cleanup if CONFIG_IOPORT_MAP
>      is defined.
> 
>  include/asm-generic/io.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> index bac63e874c7b..9ef0332490b1 100644
> --- a/include/asm-generic/io.h
> +++ b/include/asm-generic/io.h
> @@ -8,6 +8,7 @@
>  #define __ASM_GENERIC_IO_H
>  
>  #include <asm/page.h> /* I/O is all done through memory accesses */
> +#include <linux/cleanup.h>
>  #include <linux/string.h> /* for memset() and memcpy() */
>  #include <linux/types.h>
>  #include <linux/instruction_pointer.h>
> @@ -1065,6 +1066,10 @@ static inline void __iomem *ioremap(phys_addr_t addr, size_t size)
>  #endif
>  #endif /* !CONFIG_MMU || CONFIG_GENERIC_IOREMAP */
>  
> +#ifdef iounmap
> +DEFINE_FREE(iounmap, void __iomem *, iounmap(_T));
> +#endif
> +
>  #ifndef ioremap_wc
>  #define ioremap_wc ioremap
>  #endif
> @@ -1127,6 +1132,7 @@ static inline void ioport_unmap(void __iomem *p)
>  extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
>  extern void ioport_unmap(void __iomem *p);
>  #endif /* CONFIG_GENERIC_IOMAP */
> +DEFINE_FREE(ioport_unmap, void __iomem *, ioport_unmap(_T));
>  #endif /* CONFIG_HAS_IOPORT_MAP */
>  
>  #ifndef CONFIG_GENERIC_IOMAP

Has this now built successfully with LKP? (I don't think we get success 
notifications from LKP for patch submissions, only failures).

There were some odd errors last time but I think all they were unrelated 
to this change (besides the checkpatch false positive, I mean).

-- 
 i.

Re: [PATCH V5 06/20] platform/x86/intel/vsec: Add intel_vsec_register

[Ilpo Järvinen]

On Wed, 22 Nov 2023, David E. Box wrote:

> From: Gayatri Kammela <gayatri.kammela@linux.intel.com>
> 
> Add and export intel_vsec_register() to allow the registration of Intel
> extended capabilities from other drivers. Add check to look for memory
> conflicts before registering a new capability. Add a parent field to
> intel_vsec_platform_info to allow specifying the parent device for
> device managed cleanup.

Please also explain here why the usual parent relationships are not enough
in this case and you need to store it.

> diff --git a/drivers/platform/x86/intel/vsec.h b/drivers/platform/x86/intel/vsec.h
> index 8b9fad170503..bb8b6452df70 100644
> --- a/drivers/platform/x86/intel/vsec.h
> +++ b/drivers/platform/x86/intel/vsec.h
> @@ -69,6 +69,7 @@ enum intel_vsec_quirks {
>  
>  /* Platform specific data */
>  struct intel_vsec_platform_info {
> +	struct device *parent;
>  	struct intel_vsec_header **headers;
>  	unsigned long caps;
>  	unsigned long quirks;

-- 
 i.

Re: [PATCH V5 01/20] platform/x86/intel/vsec: Fix xa_alloc memory leak

[Ilpo Järvinen]

On Wed, 22 Nov 2023, David E. Box wrote:

> Fixes memory leak, caught be kmemleak, due to failure to erase auxiliary
> device entries from an xarray on removal.
> 
> Signed-off-by: David E. Box <david.e.box@linux.intel.com>
> ---
> V5 - New patch
> 
>  drivers/platform/x86/intel/vsec.c | 24 ++++++++++++++++--------
>  drivers/platform/x86/intel/vsec.h |  1 +
>  2 files changed, 17 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
> index c1f9e4471b28..ae811bb65910 100644
> --- a/drivers/platform/x86/intel/vsec.c
> +++ b/drivers/platform/x86/intel/vsec.c
> @@ -120,6 +120,8 @@ static void intel_vsec_dev_release(struct device *dev)
>  {
>  	struct intel_vsec_device *intel_vsec_dev = dev_to_ivdev(dev);
>  
> +	xa_erase(&auxdev_array, intel_vsec_dev->id);
> +
>  	mutex_lock(&vsec_ida_lock);
>  	ida_free(intel_vsec_dev->ida, intel_vsec_dev->auxdev.id);
>  	mutex_unlock(&vsec_ida_lock);
> @@ -136,9 +138,21 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
>  	int ret, id;
>  
>  	mutex_lock(&vsec_ida_lock);
> -	ret = ida_alloc(intel_vsec_dev->ida, GFP_KERNEL);
> +	id = ida_alloc(intel_vsec_dev->ida, GFP_KERNEL);
>  	mutex_unlock(&vsec_ida_lock);
> +	if (id < 0) {
> +		kfree(intel_vsec_dev->resource);
> +		kfree(intel_vsec_dev);
> +		return ret;
> +	}
> +
> +	ret = xa_alloc(&auxdev_array, &intel_vsec_dev->id, intel_vsec_dev,
> +		       PMT_XA_LIMIT, GFP_KERNEL);
>  	if (ret < 0) {
> +		mutex_lock(&vsec_ida_lock);
> +		ida_free(intel_vsec_dev->ida, id);
> +		mutex_unlock(&vsec_ida_lock);
> +
>  		kfree(intel_vsec_dev->resource);
>  		kfree(intel_vsec_dev);
>  		return ret;
> @@ -147,7 +161,7 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
>  	if (!parent)
>  		parent = &pdev->dev;
>  
> -	auxdev->id = ret;
> +	auxdev->id = id;
>  	auxdev->name = name;
>  	auxdev->dev.parent = parent;
>  	auxdev->dev.release = intel_vsec_dev_release;
> @@ -169,12 +183,6 @@ int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
>  	if (ret < 0)
>  		return ret;
>  
> -	/* Add auxdev to list */
> -	ret = xa_alloc(&auxdev_array, &id, intel_vsec_dev, PMT_XA_LIMIT,
> -		       GFP_KERNEL);
> -	if (ret)
> -		return ret;
> -
>  	return 0;

BTW, there's also another unnecessary return construct around this which 
remains after this removal. The devm_add_Action_or_reset() value can be 
returned directly (maybe make another patch from that cleanup though 
since this is a Fixes patch).

-- 
 i.

Re: [PATCH V5 12/20] asm-generic/io.h: iounmap/ioport_unmap cleanup.h support

[David E. Box]

On Thu, 2023-11-23 at 16:30 +0200, Ilpo Järvinen wrote:
> On Wed, 22 Nov 2023, David E. Box wrote:
> 
> > Add auto-release cleanups for iounmap() and ioport_unmap().
> > 
> > Signed-off-by: David E. Box <david.e.box@linux.intel.com>
> > Suggested-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
> > ---
> > V2 - Move from linux/io.h to asm-generic/io.h. Adds iounmap cleanup if
> >      iounmap() is defined. Adds ioport_unmap cleanup if CONFIG_IOPORT_MAP
> >      is defined.
> > 
> >  include/asm-generic/io.h | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> > index bac63e874c7b..9ef0332490b1 100644
> > --- a/include/asm-generic/io.h
> > +++ b/include/asm-generic/io.h
> > @@ -8,6 +8,7 @@
> >  #define __ASM_GENERIC_IO_H
> >  
> >  #include <asm/page.h> /* I/O is all done through memory accesses */
> > +#include <linux/cleanup.h>
> >  #include <linux/string.h> /* for memset() and memcpy() */
> >  #include <linux/types.h>
> >  #include <linux/instruction_pointer.h>
> > @@ -1065,6 +1066,10 @@ static inline void __iomem *ioremap(phys_addr_t addr,
> > size_t size)
> >  #endif
> >  #endif /* !CONFIG_MMU || CONFIG_GENERIC_IOREMAP */
> >  
> > +#ifdef iounmap
> > +DEFINE_FREE(iounmap, void __iomem *, iounmap(_T));
> > +#endif
> > +
> >  #ifndef ioremap_wc
> >  #define ioremap_wc ioremap
> >  #endif
> > @@ -1127,6 +1132,7 @@ static inline void ioport_unmap(void __iomem *p)
> >  extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
> >  extern void ioport_unmap(void __iomem *p);
> >  #endif /* CONFIG_GENERIC_IOMAP */
> > +DEFINE_FREE(ioport_unmap, void __iomem *, ioport_unmap(_T));
> >  #endif /* CONFIG_HAS_IOPORT_MAP */
> >  
> >  #ifndef CONFIG_GENERIC_IOMAP
> 
> Has this now built successfully with LKP? (I don't think we get success 
> notifications from LKP for patch submissions, only failures).

I haven't received it yet and don't know when or if I will. The build
instructions are provided so I can attempt to check it myself.

> 
> There were some odd errors last time but I think all they were unrelated 
> to this change (besides the checkpatch false positive, I mean).

Indeed. I couldn't explain them either except to think maybe it was related to
the implicit declaration warning. The implicit declaration warning was one that
I did see in my build after rerunning with W=1 C=1. I usually always run with
this but on V4 had done so only on the modules and forgot the bzImage.

David
> 

Re: [PATCH V5 12/20] asm-generic/io.h: iounmap/ioport_unmap cleanup.h support

[kernel test robot]

Hi David,

kernel test robot noticed the following build errors:

[auto build test ERROR on b85ea95d086471afb4ad062012a4d73cd328fa86]

url:    https://github.com/intel-lab-lkp/linux/commits/David-E-Box/platform-x86-intel-vsec-Fix-xa_alloc-memory-leak/20231123-120726
base:   b85ea95d086471afb4ad062012a4d73cd328fa86
patch link:    https://lore.kernel.org/r/20231123040355.82139-13-david.e.box%40linux.intel.com
patch subject: [PATCH V5 12/20] asm-generic/io.h: iounmap/ioport_unmap cleanup.h support
config: s390-randconfig-001-20231123 (https://download.01.org/0day-ci/archive/20231124/202311241214.jcL84du7-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231124/202311241214.jcL84du7-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311241214.jcL84du7-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/s390/kernel/asm-offsets.c:11:
   In file included from include/linux/kvm_host.h:19:
   In file included from include/linux/msi.h:27:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/s390/include/asm/io.h:78:
   include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
                                                             ^
   include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
   #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
                                                        ^
   In file included from arch/s390/kernel/asm-offsets.c:11:
   In file included from include/linux/kvm_host.h:19:
   In file included from include/linux/msi.h:27:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/s390/include/asm/io.h:78:
   include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
                                                             ^
   include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
   #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
                                                        ^
   In file included from arch/s390/kernel/asm-offsets.c:11:
   In file included from include/linux/kvm_host.h:19:
   In file included from include/linux/msi.h:27:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/s390/include/asm/io.h:78:
   include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:693:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsb(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:701:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsw(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:709:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsl(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:718:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesb(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:727:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesw(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:736:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesl(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
>> include/asm-generic/io.h:1070:38: error: call to undeclared function 'iounmap'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   DEFINE_FREE(iounmap, void __iomem *, iounmap(_T));
                                        ^
   arch/s390/include/asm/io.h:29:17: note: expanded from macro 'iounmap'
   #define iounmap iounmap
                   ^
   include/asm-generic/io.h:1070:38: note: did you mean 'vunmap'?
   arch/s390/include/asm/io.h:29:17: note: expanded from macro 'iounmap'
   #define iounmap iounmap
                   ^
   include/linux/vmalloc.h:167:13: note: 'vunmap' declared here
   extern void vunmap(const void *addr);
               ^
   In file included from arch/s390/kernel/asm-offsets.c:11:
   In file included from include/linux/kvm_host.h:19:
   In file included from include/linux/msi.h:27:
   In file included from include/linux/irq.h:591:
   In file included from arch/s390/include/asm/hw_irq.h:6:
   In file included from include/linux/pci.h:37:
   In file included from include/linux/device.h:32:
   In file included from include/linux/device/driver.h:21:
   In file included from include/linux/module.h:19:
   In file included from include/linux/elf.h:6:
   In file included from arch/s390/include/asm/elf.h:160:
   include/linux/compat.h:454:22: warning: array index 3 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
           case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
                               ^        ~
   arch/s390/include/asm/signal.h:22:9: note: array 'sig' declared here
           unsigned long sig[_NSIG_WORDS];
           ^
   In file included from arch/s390/kernel/asm-offsets.c:11:
   In file included from include/linux/kvm_host.h:19:
   In file included from include/linux/msi.h:27:
   In file included from include/linux/irq.h:591:
   In file included from arch/s390/include/asm/hw_irq.h:6:
   In file included from include/linux/pci.h:37:
   In file included from include/linux/device.h:32:
   In file included from include/linux/device/driver.h:21:
   In file included from include/linux/module.h:19:
   In file included from include/linux/elf.h:6:
   In file included from arch/s390/include/asm/elf.h:160:
   include/linux/compat.h:454:10: warning: array index 7 is past the end of the array (that has type 'compat_sigset_word[2]' (aka 'unsigned int[2]')) [-Warray-bounds]
           case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
                   ^     ~
   include/linux/compat.h:130:2: note: array 'sig' declared here
           compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
           ^
   include/linux/compat.h:454:42: warning: array index 6 is past the end of the array (that has type 'compat_sigset_word[2]' (aka 'unsigned int[2]')) [-Warray-bounds]
           case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
                                                   ^     ~
   include/linux/compat.h:130:2: note: array 'sig' declared here
           compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
           ^
   include/linux/compat.h:454:53: warning: array index 3 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
           case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
                                                              ^        ~
   arch/s390/include/asm/signal.h:22:9: note: array 'sig' declared here
           unsigned long sig[_NSIG_WORDS];
           ^
   In file included from arch/s390/kernel/asm-offsets.c:11:
   In file included from include/linux/kvm_host.h:19:
   In file included from include/linux/msi.h:27:
   In file included from include/linux/irq.h:591:
   In file included from arch/s390/include/asm/hw_irq.h:6:
   In file included from include/linux/pci.h:37:
   In file included from include/linux/device.h:32:
   In file included from include/linux/device/driver.h:21:
   In file included from include/linux/module.h:19:
   In file included from include/linux/elf.h:6:
   In file included from arch/s390/include/asm/elf.h:160:
   include/linux/compat.h:456:22: warning: array index 2 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
           case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
                               ^        ~
   arch/s390/include/asm/signal.h:22:9: note: array 'sig' declared here
           unsigned long sig[_NSIG_WORDS];
           ^
   In file included from arch/s390/kernel/asm-offsets.c:11:
   In file included from include/linux/kvm_host.h:19:
   In file included from include/linux/msi.h:27:
   In file included from include/linux/irq.h:591:
   In file included from arch/s390/include/asm/hw_irq.h:6:
   In file included from include/linux/pci.h:37:
   In file included from include/linux/device.h:32:
   In file included from include/linux/device/driver.h:21:
   In file included from include/linux/module.h:19:
   In file included from include/linux/elf.h:6:
   In file included from arch/s390/include/asm/elf.h:160:
   include/linux/compat.h:456:10: warning: array index 5 is past the end of the array (that has type 'compat_sigset_word[2]' (aka 'unsigned int[2]')) [-Warray-bounds]
           case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
                   ^     ~
   include/linux/compat.h:130:2: note: array 'sig' declared here
           compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
           ^
   include/linux/compat.h:456:42: warning: array index 4 is past the end of the array (that has type 'compat_sigset_word[2]' (aka 'unsigned int[2]')) [-Warray-bounds]
           case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
                                                   ^     ~
   include/linux/compat.h:130:2: note: array 'sig' declared here
           compat_sigset_word      sig[_COMPAT_NSIG_WORDS];
           ^
   include/linux/compat.h:456:53: warning: array index 2 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
           case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];


vim +/iounmap +1070 include/asm-generic/io.h

  1068	
  1069	#ifdef iounmap
> 1070	DEFINE_FREE(iounmap, void __iomem *, iounmap(_T));
  1071	#endif
  1072	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [PATCH V5 12/20] asm-generic/io.h: iounmap/ioport_unmap cleanup.h support

[David E. Box]

+Baoquan for ioremap question.

On Thu, 2023-11-23 at 16:30 +0200, Ilpo Järvinen wrote:
> On Wed, 22 Nov 2023, David E. Box wrote:
> 
> > Add auto-release cleanups for iounmap() and ioport_unmap().
> > 
> > Signed-off-by: David E. Box <david.e.box@linux.intel.com>
> > Suggested-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
> > ---
> > V2 - Move from linux/io.h to asm-generic/io.h. Adds iounmap cleanup if
> >      iounmap() is defined. Adds ioport_unmap cleanup if CONFIG_IOPORT_MAP
> >      is defined.
> > 
> >  include/asm-generic/io.h | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> > index bac63e874c7b..9ef0332490b1 100644
> > --- a/include/asm-generic/io.h
> > +++ b/include/asm-generic/io.h
> > @@ -8,6 +8,7 @@
> >  #define __ASM_GENERIC_IO_H
> >  
> >  #include <asm/page.h> /* I/O is all done through memory accesses */
> > +#include <linux/cleanup.h>
> >  #include <linux/string.h> /* for memset() and memcpy() */
> >  #include <linux/types.h>
> >  #include <linux/instruction_pointer.h>
> > @@ -1065,6 +1066,10 @@ static inline void __iomem *ioremap(phys_addr_t addr,
> > size_t size)
> >  #endif
> >  #endif /* !CONFIG_MMU || CONFIG_GENERIC_IOREMAP */
> >  
> > +#ifdef iounmap
> > +DEFINE_FREE(iounmap, void __iomem *, iounmap(_T));
> > +#endif

Baoquan, LKP is reporting an undeclared function 'iounmap' error with the above
change from this patch when building for s390 with PCI disabled. The ioremap
defines in arch/s390/include/asm/io.h are not wrapped under the #ifdef
CONFIG_PCI block. Shouldn't they be since the s390 Kconfig only adds
GENERIC_IOREMAP if PCI?

https://lore.kernel.org/oe-kbuild-all/202311241214.jcL84du7-lkp@intel.com


Note that the report includes pointer arithmetic warnings that are not related
to this patch. Those warnings occur in mainline as well.

David

> > +
> >  #ifndef ioremap_wc
> >  #define ioremap_wc ioremap
> >  #endif
> > @@ -1127,6 +1132,7 @@ static inline void ioport_unmap(void __iomem *p)
> >  extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
> >  extern void ioport_unmap(void __iomem *p);
> >  #endif /* CONFIG_GENERIC_IOMAP */
> > +DEFINE_FREE(ioport_unmap, void __iomem *, ioport_unmap(_T));
> >  #endif /* CONFIG_HAS_IOPORT_MAP */
> >  
> >  #ifndef CONFIG_GENERIC_IOMAP
> 
> Has this now built successfully with LKP? (I don't think we get success 
> notifications from LKP for patch submissions, only failures).
> 
> There were some odd errors last time but I think all they were unrelated 
> to this change (besides the checkpatch false positive, I mean).
> 

Re: [PATCH V5 12/20] asm-generic/io.h: iounmap/ioport_unmap cleanup.h support

[Baoquan He]

On 11/27/23 at 05:55pm, David E. Box wrote:
> +Baoquan for ioremap question.
> 
> On Thu, 2023-11-23 at 16:30 +0200, Ilpo Järvinen wrote:
> > On Wed, 22 Nov 2023, David E. Box wrote:
> > 
> > > Add auto-release cleanups for iounmap() and ioport_unmap().
> > > 
> > > Signed-off-by: David E. Box <david.e.box@linux.intel.com>
> > > Suggested-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
> > > ---
> > > V2 - Move from linux/io.h to asm-generic/io.h. Adds iounmap cleanup if
> > >      iounmap() is defined. Adds ioport_unmap cleanup if CONFIG_IOPORT_MAP
> > >      is defined.
> > > 
> > >  include/asm-generic/io.h | 6 ++++++
> > >  1 file changed, 6 insertions(+)
> > > 
> > > diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> > > index bac63e874c7b..9ef0332490b1 100644
> > > --- a/include/asm-generic/io.h
> > > +++ b/include/asm-generic/io.h
> > > @@ -8,6 +8,7 @@
> > >  #define __ASM_GENERIC_IO_H
> > >  
> > >  #include <asm/page.h> /* I/O is all done through memory accesses */
> > > +#include <linux/cleanup.h>
> > >  #include <linux/string.h> /* for memset() and memcpy() */
> > >  #include <linux/types.h>
> > >  #include <linux/instruction_pointer.h>
> > > @@ -1065,6 +1066,10 @@ static inline void __iomem *ioremap(phys_addr_t addr,
> > > size_t size)
> > >  #endif
> > >  #endif /* !CONFIG_MMU || CONFIG_GENERIC_IOREMAP */
> > >  
> > > +#ifdef iounmap
> > > +DEFINE_FREE(iounmap, void __iomem *, iounmap(_T));
> > > +#endif
> 
> Baoquan, LKP is reporting an undeclared function 'iounmap' error with the above
> change from this patch when building for s390 with PCI disabled. The ioremap
> defines in arch/s390/include/asm/io.h are not wrapped under the #ifdef
> CONFIG_PCI block. Shouldn't they be since the s390 Kconfig only adds
> GENERIC_IOREMAP if PCI?

Sorry, almost forget this mail. Will check and reply later.

> 
> https://lore.kernel.org/oe-kbuild-all/202311241214.jcL84du7-lkp@intel.com
> 
> 
> Note that the report includes pointer arithmetic warnings that are not related
> to this patch. Those warnings occur in mainline as well.
> 
> David
> 
> > > +
> > >  #ifndef ioremap_wc
> > >  #define ioremap_wc ioremap
> > >  #endif
> > > @@ -1127,6 +1132,7 @@ static inline void ioport_unmap(void __iomem *p)
> > >  extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
> > >  extern void ioport_unmap(void __iomem *p);
> > >  #endif /* CONFIG_GENERIC_IOMAP */
> > > +DEFINE_FREE(ioport_unmap, void __iomem *, ioport_unmap(_T));
> > >  #endif /* CONFIG_HAS_IOPORT_MAP */
> > >  
> > >  #ifndef CONFIG_GENERIC_IOMAP
> > 
> > Has this now built successfully with LKP? (I don't think we get success 
> > notifications from LKP for patch submissions, only failures).
> > 
> > There were some odd errors last time but I think all they were unrelated 
> > to this change (besides the checkpatch false positive, I mean).
> > 
> 

Re: [PATCH V5 12/20] asm-generic/io.h: iounmap/ioport_unmap cleanup.h support

[Baoquan He]

On 11/27/23 at 05:55pm, David E. Box wrote:
> +Baoquan for ioremap question.
> 
> On Thu, 2023-11-23 at 16:30 +0200, Ilpo Järvinen wrote:
> > On Wed, 22 Nov 2023, David E. Box wrote:
> > 
> > > Add auto-release cleanups for iounmap() and ioport_unmap().
> > > 
> > > Signed-off-by: David E. Box <david.e.box@linux.intel.com>
> > > Suggested-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
> > > ---
> > > V2 - Move from linux/io.h to asm-generic/io.h. Adds iounmap cleanup if
> > >      iounmap() is defined. Adds ioport_unmap cleanup if CONFIG_IOPORT_MAP
> > >      is defined.
> > > 
> > >  include/asm-generic/io.h | 6 ++++++
> > >  1 file changed, 6 insertions(+)
> > > 
> > > diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> > > index bac63e874c7b..9ef0332490b1 100644
> > > --- a/include/asm-generic/io.h
> > > +++ b/include/asm-generic/io.h
> > > @@ -8,6 +8,7 @@
> > >  #define __ASM_GENERIC_IO_H
> > >  
> > >  #include <asm/page.h> /* I/O is all done through memory accesses */
> > > +#include <linux/cleanup.h>
> > >  #include <linux/string.h> /* for memset() and memcpy() */
> > >  #include <linux/types.h>
> > >  #include <linux/instruction_pointer.h>
> > > @@ -1065,6 +1066,10 @@ static inline void __iomem *ioremap(phys_addr_t addr,
> > > size_t size)
> > >  #endif
> > >  #endif /* !CONFIG_MMU || CONFIG_GENERIC_IOREMAP */
> > >  
> > > +#ifdef iounmap
> > > +DEFINE_FREE(iounmap, void __iomem *, iounmap(_T));
> > > +#endif
> 
> Baoquan, LKP is reporting an undeclared function 'iounmap' error with the above
> change from this patch when building for s390 with PCI disabled. The ioremap
> defines in arch/s390/include/asm/io.h are not wrapped under the #ifdef
> CONFIG_PCI block. Shouldn't they be since the s390 Kconfig only adds
> GENERIC_IOREMAP if PCI?
> 
> https://lore.kernel.org/oe-kbuild-all/202311241214.jcL84du7-lkp@intel.com

I tried to reproduce the error, while I got failure as below. I will find a
s390x machine to try again.

---------------------------------------------------------
[root@ linux]# COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-16 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 olddefconfig
Compiler will be installed in /root/0day
PATH=/root/0day/llvm-16.0.6-x86_64/bin:/root/.local/bin:/root/bin:/usr/lib64/ccache:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
make --keep-going HOSTCC=/root/0day/llvm-16.0.6-x86_64/bin/clang CC=/root/0day/llvm-16.0.6-x86_64/bin/clang OBJCOPY=/usr/s390x-linux-gnu/bin/objcopy AR=llvm-ar NM=llvm-nm STRIP=llvm-strip OBJDUMP=llvm-objdump OBJSIZE=llvm-size READELF=llvm-readelf HOSTCXX=clang++ HOSTAR=llvm-ar CROSS_COMPILE=s390x-linux-gnu- --jobs=128 KCFLAGS= -Wtautological-compare -Wno-error=return-type -Wreturn-type -Wcast-function-type -funsigned-char -Wundef -fstrict-flex-arrays=3 -Wenum-conversion W=1 O=build_dir ARCH=s390 olddefconfig
make[1]: Entering directory '/root/linux/build_dir'
  GEN     Makefile
scripts/Kconfig.include:40: linker 's390x-linux-gnu-ld' not found
make[3]: *** [../scripts/kconfig/Makefile:77: olddefconfig] Error 1
make[2]: *** [/root/linux/Makefile:685: olddefconfig] Error 2
make[1]: *** [/root/linux/Makefile:234: __sub-make] Error 2
make[1]: Target 'olddefconfig' not remade because of errors.
make[1]: Leaving directory '/root/linux/build_dir'
make: *** [Makefile:234: __sub-make] Error 2
make: Target 'olddefconfig' not remade because of errors.
------------------------------------------------------------------

And when I execute the 3rd step of reproducer to apply the required
patch series, I never succeed. Don't know why.

----------------------------------------------------------------
[root@intel-knightslanding-lb-02 linux]# b4 shazam https://lore.kernel.org/r/20231123040355.82139-13-david.e.box@linux.intel.com
Grabbing thread from lore.kernel.org/all/20231123040355.82139-13-david.e.box@linux.intel.com/t.mbox.gz
Checking for newer revisions
Grabbing search results from lore.kernel.org
  Added from v6: 21 patches
Analyzing 63 messages in the thread
Will use the latest revision: v6
You can pick other revisions using the -vN flag
Checking attestation on all messages, may take a moment...
---
  ✓ [PATCH v6 1/20] platform/x86/intel/vsec: Fix xa_alloc memory leak
----------------------------------------------------------------




> 
> 
> Note that the report includes pointer arithmetic warnings that are not related
> to this patch. Those warnings occur in mainline as well.
> 
> David
> 
> > > +
> > >  #ifndef ioremap_wc
> > >  #define ioremap_wc ioremap
> > >  #endif
> > > @@ -1127,6 +1132,7 @@ static inline void ioport_unmap(void __iomem *p)
> > >  extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
> > >  extern void ioport_unmap(void __iomem *p);
> > >  #endif /* CONFIG_GENERIC_IOMAP */
> > > +DEFINE_FREE(ioport_unmap, void __iomem *, ioport_unmap(_T));
> > >  #endif /* CONFIG_HAS_IOPORT_MAP */
> > >  
> > >  #ifndef CONFIG_GENERIC_IOMAP
> > 
> > Has this now built successfully with LKP? (I don't think we get success 
> > notifications from LKP for patch submissions, only failures).
> > 
> > There were some odd errors last time but I think all they were unrelated 
> > to this change (besides the checkpatch false positive, I mean).
> > 
>