Export lmem maximum memory bandwidth to the userspace via sysfs.
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 2 ++
drivers/gpu/drm/i915/i915_sysfs.c | 27 +++++++++++++++++++++++++++
2 files changed, 29 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index c4921c9a60770..3ba1efa995ca9 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6603,6 +6603,8 @@
#define POWER_SETUP_I1_WATTS REG_BIT(31)
#define POWER_SETUP_I1_SHIFT 6 /* 10.6 fixed point format */
#define POWER_SETUP_I1_DATA_MASK REG_GENMASK(15, 0)
+#define PCODE_MEMORY_CONFIG 0x70
+#define MEMORY_CONFIG_SUBCOMMAND_READ_MAX_BANDWIDTH 0x0
#define GEN12_PCODE_READ_SAGV_BLOCK_TIME_US 0x23
#define XEHP_PCODE_FREQUENCY_CONFIG 0x6e /* xehpsdv, pvc */
/* XEHP_PCODE_FREQUENCY_CONFIG sub-commands (param1) */
diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c
index 595e8b5749907..0a6efc300998b 100644
--- a/drivers/gpu/drm/i915/i915_sysfs.c
+++ b/drivers/gpu/drm/i915/i915_sysfs.c
@@ -37,7 +37,10 @@
#include "i915_drv.h"
#include "i915_sysfs.h"
+#include "i915_reg.h"
#include "intel_pm.h"
+#include "intel_pcode.h"
+
struct drm_i915_private *kdev_minor_to_i915(struct device *kdev)
{
@@ -231,11 +234,35 @@ static void i915_setup_error_capture(struct device *kdev) {}
static void i915_teardown_error_capture(struct device *kdev) {}
#endif
+static ssize_t
+prelim_lmem_max_bw_Mbps_show(struct device *dev, struct device_attribute *attr, char *buff)
+{
+ struct drm_i915_private *i915 = kdev_minor_to_i915(dev);
+ u32 val;
+ int err;
+
+ err = snb_pcode_read_p(&i915->uncore, PCODE_MEMORY_CONFIG,
+ MEMORY_CONFIG_SUBCOMMAND_READ_MAX_BANDWIDTH,
+ 0x0, &val);
+ if (err)
+ return err;
+
+ return sysfs_emit(buff, "%u\n", val);
+}
+
+static DEVICE_ATTR_RO(prelim_lmem_max_bw_Mbps);
+
void i915_setup_sysfs(struct drm_i915_private *dev_priv)
{
struct device *kdev = dev_priv->drm.primary->kdev;
int ret;
+ if (IS_DG1(dev_priv) || IS_DG2(dev_priv)) {
+ ret = sysfs_create_file(&kdev->kobj, &dev_attr_prelim_lmem_max_bw_Mbps.attr);
+ if (ret)
+ drm_err(&dev_priv->drm, "Setting up sysfs to read max B/W failed\n");
+ }
+
if (HAS_L3_DPF(dev_priv)) {
ret = device_create_bin_file(kdev, &dpf_attrs);
if (ret)
--
2.25.1
