[PATCH 4/4] drm/xe/xe_debugfs: Exposure of Mods residency counter

[Soham Purkait <soham.purkait@intel.com>]

Add a debugfs node named mods_residency in order to obtain the ModS
residency counter value.

Signed-off-by: Soham Purkait <soham.purkait@intel.com>
---
 drivers/gpu/drm/xe/xe_debugfs.c | 34 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_debugfs.h |  1 +
 2 files changed, 35 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_debugfs.c b/drivers/gpu/drm/xe/xe_debugfs.c
index 66eab5528b92..240cb73800ae 100644
--- a/drivers/gpu/drm/xe/xe_debugfs.c
+++ b/drivers/gpu/drm/xe/xe_debugfs.c
@@ -238,6 +238,32 @@ static ssize_t g10_residency_show(struct file *f, char __user *ubuf,
 	return simple_read_from_buffer(ubuf, size, pos, buf, len);
 }
 
+static ssize_t mods_residency_show(struct file *f, char __user *ubuf,
+				   size_t size, loff_t *pos)
+{
+	u64 reg_val;
+	char buf[32];
+	int len = 0;
+	int ret = 0;
+	struct xe_device *xe;
+	struct xe_mmio *mmio;
+
+	xe = file_inode(f)->i_private;
+	mmio = xe_root_tile_mmio(xe);
+	ret = xe_pmt_telem_read(to_pci_dev(xe->drm.dev),
+				xe_mmio_read32(mmio, PUNIT_TELEMETRY_GUID),
+				&reg_val,
+				BMG_MODS_RESIDENCY_OFFSET,
+				sizeof(reg_val));
+
+	drm_warn(&xe->drm, "ModS Residency read from mbx 0x%016llx, ret %d\n",
+		 reg_val, ret);
+
+	len = scnprintf(buf, sizeof(buf), "%llu\n", reg_val);
+
+	return simple_read_from_buffer(ubuf, size, pos, buf, len);
+}
+
 static const struct file_operations wedged_mode_fops = {
 	.owner = THIS_MODULE,
 	.read = wedged_mode_show,
@@ -254,6 +280,11 @@ static const struct file_operations g10_residency_fops = {
 	.read = g10_residency_show,
 };
 
+static const struct file_operations mods_residency_fops = {
+	.owner = THIS_MODULE,
+	.read = mods_residency_show,
+};
+
 void xe_debugfs_register(struct xe_device *xe)
 {
 	struct ttm_device *bdev = &xe->ttm;
@@ -279,6 +310,9 @@ void xe_debugfs_register(struct xe_device *xe)
 
 	debugfs_create_file("g10_residency", 0444, root, xe,
 			    &g10_residency_fops);
+
+	debugfs_create_file("mods_residency", 0444, root, xe,
+			    &mods_residency_fops);
     
 	for (mem_type = XE_PL_VRAM0; mem_type <= XE_PL_VRAM1; ++mem_type) {
 		man = ttm_manager_type(bdev, mem_type);
diff --git a/drivers/gpu/drm/xe/xe_debugfs.h b/drivers/gpu/drm/xe/xe_debugfs.h
index 27fbb8d46471..55ef13662fec 100644
--- a/drivers/gpu/drm/xe/xe_debugfs.h
+++ b/drivers/gpu/drm/xe/xe_debugfs.h
@@ -10,6 +10,7 @@ struct xe_device;
 
 #define BMG_G8_RESIDENCY_OFFSET			(0x540)
 #define BMG_G10_RESIDENCY_OFFSET		(0x548)
+#define BMG_MODS_RESIDENCY_OFFSET		(0x4D0)
 
 #ifdef CONFIG_DEBUG_FS
 void xe_debugfs_register(struct xe_device *xe);
-- 
2.34.1