On 15-11-2022 13:38, Himal Prasad Ghimiray wrote:
> 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
>
prelim naming shall not be used.
Thanks,
Aravind.
> +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)
