[PATCH 2/4] drm/xe/xe_debugfs: Exposure of G8 residency counter

[Soham Purkait]

Add a debugfs node named g8_residency in order to obtain the G8
residency counter value.

Signed-off-by: Soham Purkait <soham.purkait at intel.com>
---
 drivers/gpu/drm/xe/xe_debugfs.c | 37 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_debugfs.h |  2 ++
 2 files changed, 39 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_debugfs.c b/drivers/gpu/drm/xe/xe_debugfs.c
index d0503959a8ed..f9ab6a03af29 100644
--- a/drivers/gpu/drm/xe/xe_debugfs.c
+++ b/drivers/gpu/drm/xe/xe_debugfs.c
@@ -11,16 +11,19 @@
 
 #include <drm/drm_debugfs.h>
 
+#include "regs/xe_pmt.h"
 #include "xe_bo.h"
 #include "xe_device.h"
 #include "xe_force_wake.h"
 #include "xe_gt_debugfs.h"
 #include "xe_gt_printk.h"
 #include "xe_guc_ads.h"
+#include "xe_mmio.h"
 #include "xe_pm.h"
 #include "xe_pxp_debugfs.h"
 #include "xe_sriov.h"
 #include "xe_step.h"
+#include "xe_vsec.h"
 
 #ifdef CONFIG_DRM_XE_DEBUG
 #include "xe_bo_evict.h"
@@ -185,12 +188,43 @@ static ssize_t wedged_mode_set(struct file *f, const char __user *ubuf,
 	return size;
 }
 
+static ssize_t g8_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_G8_RESIDENCY_OFFSET,
+				sizeof(reg_val));
+
+	drm_warn(&xe->drm, "G8 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,
 	.write = wedged_mode_set,
 };
 
+static const struct file_operations g8_residency_fops = {
+	.owner = THIS_MODULE,
+	.read = g8_residency_show,
+};
+
 void xe_debugfs_register(struct xe_device *xe)
 {
 	struct ttm_device *bdev = &xe->ttm;
@@ -211,6 +245,9 @@ void xe_debugfs_register(struct xe_device *xe)
 	debugfs_create_file("wedged_mode", 0600, root, xe,
 			    &wedged_mode_fops);
 
+	debugfs_create_file("g8_residency", 0444, root, xe,
+			    &g8_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 17f4c2f1b5e4..86868a3cd379 100644
--- a/drivers/gpu/drm/xe/xe_debugfs.h
+++ b/drivers/gpu/drm/xe/xe_debugfs.h
@@ -8,6 +8,8 @@
 
 struct xe_device;
 
+#define BMG_G8_RESIDENCY_OFFSET			(0x540)
+
 #ifdef CONFIG_DEBUG_FS
 void xe_debugfs_register(struct xe_device *xe);
 #else
-- 
2.34.1