> -----Original Message-----
> From: Intel-gfx <[email protected]> On Behalf Of
> Himal Prasad Ghimiray
> Sent: Monday, November 21, 2022 3:32 PM
> To: [email protected]
> Subject: [Intel-gfx] [PATCH 1/1] drm/i915: Export LMEM max memory
> bandwidth via sysfs
>
> Export lmem maximum memory bandwidth to the userspace via sysfs
>
> (v2)
> Add TODO comment to have client parts specific condition (Anshuman)
> Remove prelim prefix from the sysfs node name (Aravind)
>
> Signed-off-by: Himal Prasad Ghimiray <[email protected]>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 2 ++
> drivers/gpu/drm/i915/i915_sysfs.c | 28 ++++++++++++++++++++++++++++
> 2 files changed, 30 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h
> b/drivers/gpu/drm/i915/i915_reg.h index 8e1892d147741..1d59b84b86ad2
> 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -6606,6 +6606,8 @@
> #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
Please use DG1_ prefix as this mbox started from DG1 onwards.
And please try to follow the ascending order for commands attest for the new
command we are adding.
> +#define
> MEMORY_CONFIG_SUBCOMMAND_READ_MAX_BANDWIDTH 0x0
Here as well use DG1_ prefix.
> #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..69df2012bd10e 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 +234,36 @@ static void i915_setup_error_capture(struct device
> *kdev) {} static void i915_teardown_error_capture(struct device *kdev) {}
> #endif
>
> +static ssize_t
> +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(lmem_max_bw_Mbps);
> +
> void i915_setup_sysfs(struct drm_i915_private *dev_priv) {
> struct device *kdev = dev_priv->drm.primary->kdev;
> int ret;
>
> + /*TODO: Need to add client Parts condition check. */
Nit use space after '/*'
/* TODO: Need to add client parts specific conditional check */ would be good.
BR,
Anshuman Gupta.
> + if (IS_DG1(dev_priv) || IS_DG2(dev_priv)) {
> + ret = sysfs_create_file(&kdev->kobj,
> &dev_attr_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
