mei: expose device kind for ioe device

Detect IO extender device and set appropriate kind.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Co-developed-by: Reuven Abliyev <reuvenab@gmail.com>
Signed-off-by: Reuven Abliyev <reuvenab@gmail.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Link: https://patch.msgid.link/20260409125524.111530-3-alexander.usyskin@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

6 files changed, 41 insertions, 5 deletions

diff --git a/drivers/misc/mei/hw-me-regs.h b/drivers/misc/mei/hw-me-regs.h
index f145e8e36cb3..b9a67629496b 100644
--- a/drivers/misc/mei/hw-me-regs.h
+++ b/drivers/misc/mei/hw-me-regs.h
@@ -6,6 +6,8 @@
 #ifndef _MEI_HW_MEI_REGS_H_
 #define _MEI_HW_MEI_REGS_H_
 
+#include <linux/bits.h>
+
 /*
  * MEI device IDs
  */
@@ -142,6 +144,8 @@
 #  define PCI_CFG_HFS_2_PM_CM_RESET_ERROR     0x5000000 /* CME reset due to exception */
 #  define PCI_CFG_HFS_2_PM_EVENT_MASK         0xf000000
 #define PCI_CFG_HFS_3         0x60
+#  define PCI_CFG_HFS_3_EXT_SKU_MSK  GENMASK(3, 0) /* IOE detection bits */
+#  define PCI_CFG_HFS_3_EXT_SKU_IOE  0x00000001
 #  define PCI_CFG_HFS_3_FW_SKU_MSK   0x00000070
 #  define PCI_CFG_HFS_3_FW_SKU_IGN   0x00000000
 #  define PCI_CFG_HFS_3_FW_SKU_SPS   0x00000060
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index 28fbd432d80d..e7fbc02fb70f 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -4,13 +4,13 @@
  * Intel Management Engine Interface (Intel MEI) Linux driver
  */
 
-#include <linux/pci.h>
-
-#include <linux/kthread.h>
+#include <linux/bitfield.h>
+#include <linux/delay.h>
 #include <linux/interrupt.h>
+#include <linux/kthread.h>
+#include <linux/pci.h>
 #include <linux/pm_runtime.h>
 #include <linux/sizes.h>
-#include <linux/delay.h>
 
 #include "mei_dev.h"
 #include "hbm.h"
@@ -1619,6 +1619,23 @@ static enum mei_dev_kind mei_cfg_kind_gscfi(const struct device *parent)
 #define MEI_CFG_KIND_GSCFI                   \
 	.get_kind = mei_cfg_kind_gscfi
 
+static enum mei_dev_kind mei_cfg_kind_ioe(const struct device *parent)
+{
+	const struct pci_dev *pdev = to_pci_dev(parent);
+	unsigned int devfn;
+	u32 reg;
+	int ret;
+
+	devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
+	ret = pci_bus_read_config_dword(pdev->bus, devfn, PCI_CFG_HFS_3, &reg);
+	trace_mei_pci_cfg_read(parent, "PCI_CFG_HFS_3", PCI_CFG_HFS_3, reg, ret);
+	return FIELD_GET(PCI_CFG_HFS_3_EXT_SKU_MSK, reg) == PCI_CFG_HFS_3_EXT_SKU_IOE ?
+		MEI_DEV_KIND_IOE : MEI_DEV_KIND_MEI;
+}
+
+#define MEI_CFG_KIND_IOE                     \
+	.get_kind = mei_cfg_kind_ioe
+
 #define MEI_CFG_FW_VER_SUPP                     \
 	.fw_ver_supported = 1
 
@@ -1781,6 +1798,15 @@ static const struct mei_cfg mei_me_csc_cfg = {
 	MEI_CFG_FW_VER_SUPP,
 };
 
+/* Nova Lake with possible IOE devices */
+static const struct mei_cfg mei_me_pch22_ioe_cfg = {
+	MEI_CFG_KIND_IOE,
+	MEI_CFG_PCH8_HFS,
+	MEI_CFG_FW_VER_SUPP,
+	MEI_CFG_DMA_128,
+	MEI_CFG_TRC,
+};
+
 /*
  * mei_cfg_list - A list of platform platform specific configurations.
  * Note: has to be synchronized with  enum mei_cfg_idx.
@@ -1804,6 +1830,7 @@ static const struct mei_cfg *const mei_cfg_list[] = {
 	[MEI_ME_GSC_CFG] = &mei_me_gsc_cfg,
 	[MEI_ME_GSCFI_CFG] = &mei_me_gscfi_cfg,
 	[MEI_ME_CSC_CFG] = &mei_me_csc_cfg,
+	[MEI_ME_PCH22_IOE_CFG] = &mei_me_pch22_ioe_cfg,
 };
 
 const struct mei_cfg *mei_me_get_cfg(kernel_ulong_t idx)
diff --git a/drivers/misc/mei/hw-me.h b/drivers/misc/mei/hw-me.h
index 884736d76fbb..e36f871f323e 100644
--- a/drivers/misc/mei/hw-me.h
+++ b/drivers/misc/mei/hw-me.h
@@ -105,6 +105,7 @@ static inline bool mei_me_hw_use_polling(const struct mei_me_hw *hw)
  * @MEI_ME_GSC_CFG:        Graphics System Controller
  * @MEI_ME_GSCFI_CFG:      Graphics System Controller Firmware Interface
  * @MEI_ME_CSC_CFG:        Chassis System Controller Firmware Interface
+ * @MEI_ME_PCH22_IOE_CFG:  Platform Controller Hub Gen22 and newer with IOE detection
  * @MEI_ME_NUM_CFG:        Upper Sentinel.
  */
 enum mei_cfg_idx {
@@ -126,6 +127,7 @@ enum mei_cfg_idx {
 	MEI_ME_GSC_CFG,
 	MEI_ME_GSCFI_CFG,
 	MEI_ME_CSC_CFG,
+	MEI_ME_PCH22_IOE_CFG,
 	MEI_ME_NUM_CFG,
 };
 
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index 43667e5d3708..4fbf0b323616 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -1171,6 +1171,7 @@ static const char * const mei_kind_names[] = {
 	"gsc",
 	"gscfi",
 	"ivsc",
+	"ioe",
 };
 static_assert(ARRAY_SIZE(mei_kind_names) == MEI_DEV_KIND_MAX);
 
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 6d081c496ccc..e651b06704a1 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -477,6 +477,7 @@ struct mei_dev_timeouts {
  * @MEI_DEV_KIND_GSC: discete graphics content protection
  * @MEI_DEV_KIND_GSCFI: discete graphics chassis controller
  * @MEI_DEV_KIND_IVSC: visual sensing controller
+ * @MEI_DEV_KIND_IOE: IO extender
  * @MEI_DEV_KIND_MAX: sentinel
  */
 enum mei_dev_kind {
@@ -485,6 +486,7 @@ enum mei_dev_kind {
 	MEI_DEV_KIND_GSC,
 	MEI_DEV_KIND_GSCFI,
 	MEI_DEV_KIND_IVSC,
+	MEI_DEV_KIND_IOE,
 	MEI_DEV_KIND_MAX
 };
 
diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
index 9efeafa8f1ca..55e0b8a98827 100644
--- a/drivers/misc/mei/pci-me.c
+++ b/drivers/misc/mei/pci-me.c
@@ -130,7 +130,7 @@ static const struct pci_device_id mei_me_pci_tbl[] = {
 
 	{PCI_DEVICE_DATA(INTEL, MEI_WCL_P, MEI_ME_PCH15_CFG)},
 
-	{PCI_DEVICE_DATA(INTEL, MEI_NVL_S, MEI_ME_PCH15_CFG)},
+	{PCI_DEVICE_DATA(INTEL, MEI_NVL_S, MEI_ME_PCH22_IOE_CFG)},
 	{PCI_DEVICE_DATA(INTEL, MEI_NVL_H, MEI_ME_PCH15_CFG)},
 
 	/* required last entry */