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

[Gupta, Anshuman]

> -----Original Message-----
> From: Purkait, Soham <soham.purkait at intel.com>
> Sent: Wednesday, May 14, 2025 1:37 PM
> To: intel-xe at lists.freedesktop.org; Gupta, Anshuman
> <anshuman.gupta at intel.com>; Nilawar, Badal <badal.nilawar at intel.com>;
> Poosa, Karthik <karthik.poosa at intel.com>
> Cc: De Marchi, Lucas <lucas.demarchi at intel.com>; Purkait, Soham
> <soham.purkait at intel.com>; Dixit, Ashutosh <ashutosh.dixit at intel.com>;
> Tauro, Riana <riana.tauro at intel.com>
> Subject: [PATCH 2/4] drm/xe/xe_debugfs: Exposure of G8 residency counter
> 
> Add a debugfs node named g8_residency in order to obtain the G8 residency
> counter value.
IMO better to expose all such residencies under a debugfs called dgfx_pkgc_residencies 
CC @Vivi, Rodrigo for naming suggestion. 
Context: This is similar to cpu PC8~PC10 residencies. i.e  /sys/kernel/debug/pmc_core/package_cstate_show 

Thanks,
Anshuman.
> 
> 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