[PATCH 4/4] drm/xe/xe_debugfs: Exposure of Mods residency counter
Soham Purkait
soham.purkait at intel.com
Wed May 14 08:07:21 UTC 2025
Add a debugfs node named mods_residency in order to obtain the ModS
residency counter value.
Signed-off-by: Soham Purkait <soham.purkait at 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),
+ ®_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
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