[PATCH V3 4/7] drm/amd/pm: setup the framework to support Wifi RFI mitigation feature
Mario Limonciello
mario.limonciello at amd.com
Mon Jun 19 02:22:38 UTC 2023
On 6/16/23 01:57, Evan Quan wrote:
> With WBRF feature supported, as a driver responding to the frequencies,
> amdgpu driver is able to do shadow pstate switching to mitigate possible
> interference(between its (G-)DDR memory clocks and local radio module
> frequency bands used by Wifi 6/6e/7).
>
> To make WBRF feature functional, the kernel needs to be configured with
> CONFIG_ACPI_WBRF and the platform is equipped with necessary ACPI based
> mechanism to get amdgpu driver notified.
>
> Signed-off-by: Evan Quan <evan.quan at amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello at amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu.h | 26 +++
> drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c | 63 ++++++
> drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 19 ++
> drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c | 184 ++++++++++++++++++
> drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h | 20 ++
> drivers/gpu/drm/amd/pm/swsmu/smu_internal.h | 3 +
> 6 files changed, 315 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index 02b827785e39..2f2ec64ed1b2 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -50,6 +50,7 @@
> #include <linux/hashtable.h>
> #include <linux/dma-fence.h>
> #include <linux/pci.h>
> +#include <linux/wbrf.h>
>
> #include <drm/ttm/ttm_bo.h>
> #include <drm/ttm/ttm_placement.h>
> @@ -241,6 +242,7 @@ extern int amdgpu_num_kcq;
> #define AMDGPU_VCNFW_LOG_SIZE (32 * 1024)
> extern int amdgpu_vcnfw_log;
> extern int amdgpu_sg_display;
> +extern int amdgpu_wbrf;
>
> #define AMDGPU_VM_MAX_NUM_CTX 4096
> #define AMDGPU_SG_THRESHOLD (256*1024*1024)
> @@ -741,6 +743,9 @@ struct amdgpu_reset_domain;
> */
> #define AMDGPU_HAS_VRAM(_adev) ((_adev)->gmc.real_vram_size)
>
> +typedef
> +void (*wbrf_notify_handler) (struct amdgpu_device *adev);
> +
> struct amdgpu_device {
> struct device *dev;
> struct pci_dev *pdev;
> @@ -1050,6 +1055,8 @@ struct amdgpu_device {
>
> bool job_hang;
> bool dc_enabled;
> +
> + wbrf_notify_handler wbrf_event_handler;
> };
>
> static inline struct amdgpu_device *drm_to_adev(struct drm_device *ddev)
> @@ -1381,6 +1388,25 @@ static inline int amdgpu_acpi_smart_shift_update(struct drm_device *dev,
> enum amdgpu_ss ss_state) { return 0; }
> #endif
>
> +#if defined(CONFIG_ACPI_WBRF)
> +bool amdgpu_acpi_is_wbrf_supported(struct amdgpu_device *adev);
> +int amdgpu_acpi_wbrf_retrieve_exclusions(struct amdgpu_device *adev,
> + struct wbrf_ranges_out *exclusions_out);
> +int amdgpu_acpi_register_wbrf_notify_handler(struct amdgpu_device *adev,
> + wbrf_notify_handler handler);
> +int amdgpu_acpi_unregister_wbrf_notify_handler(struct amdgpu_device *adev);
> +#else
> +static inline bool amdgpu_acpi_is_wbrf_supported(struct amdgpu_device *adev) { return false; }
> +static inline
> +int amdgpu_acpi_wbrf_retrieve_exclusions(struct amdgpu_device *adev,
> + struct wbrf_ranges_out *exclusions_out) { return 0; }
> +static inline
> +int amdgpu_acpi_register_wbrf_notify_handler(struct amdgpu_device *adev,
> + wbrf_notify_handler handler) { return 0; }
> +static inline
> +int amdgpu_acpi_unregister_wbrf_notify_handler(struct amdgpu_device *adev) { return 0; }
> +#endif
> +
> #if defined(CONFIG_ACPI) && defined(CONFIG_SUSPEND)
> bool amdgpu_acpi_is_s3_active(struct amdgpu_device *adev);
> bool amdgpu_acpi_is_s0ix_active(struct amdgpu_device *adev);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
> index aeeec211861c..efbe6dd91d1a 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
> @@ -1105,3 +1105,66 @@ bool amdgpu_acpi_is_s0ix_active(struct amdgpu_device *adev)
> }
>
> #endif /* CONFIG_SUSPEND */
> +
> +#ifdef CONFIG_ACPI_WBRF
> +bool amdgpu_acpi_is_wbrf_supported(struct amdgpu_device *adev)
> +{
> + struct acpi_device *acpi_dev = ACPI_COMPANION(adev->dev);
> +
> + if (!acpi_dev)
> + return false;
> +
> + return wbrf_supported_consumer(acpi_dev);
> +}
> +
> +int amdgpu_acpi_wbrf_retrieve_exclusions(struct amdgpu_device *adev,
> + struct wbrf_ranges_out *exclusions_out)
> +{
> + struct acpi_device *acpi_dev = ACPI_COMPANION(adev->dev);
> +
> + if (!acpi_dev)
> + return -ENODEV;
> +
> + return wbrf_retrieve_exclusions(acpi_dev, exclusions_out);
> +}
> +
> +#define CPM_GPU_NOTIFY_COMMAND 0x55
> +static void amdgpu_acpi_wbrf_event(acpi_handle handle, u32 event, void *data)
> +{
> + struct amdgpu_device *adev = (struct amdgpu_device *)data;
> +
> + if (event == CPM_GPU_NOTIFY_COMMAND &&
> + adev->wbrf_event_handler)
> + adev->wbrf_event_handler(adev);
> +}
> +
> +int amdgpu_acpi_register_wbrf_notify_handler(struct amdgpu_device *adev,
> + wbrf_notify_handler handler)
> +{
> + struct acpi_handle *acpi_hdler = ACPI_HANDLE(adev->dev);
> +
> + if (!acpi_hdler)
> + return -ENODEV;
> +
> + adev->wbrf_event_handler = handler;
> +
> + return acpi_install_notify_handler(acpi_hdler,
> + ACPI_ALL_NOTIFY,
> + amdgpu_acpi_wbrf_event,
> + adev);
> +}
> +
> +int amdgpu_acpi_unregister_wbrf_notify_handler(struct amdgpu_device *adev)
> +{
> + struct acpi_handle *acpi_hdler = ACPI_HANDLE(adev->dev);
> +
> + if (!acpi_hdler)
> + return -ENODEV;
> +
> + adev->wbrf_event_handler = NULL;
> +
> + return acpi_remove_notify_handler(acpi_hdler,
> + ACPI_ALL_NOTIFY,
> + amdgpu_acpi_wbrf_event);
> +}
> +#endif
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index b1ca1ab6d6ad..bf82cc192153 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -191,6 +191,7 @@ int amdgpu_smartshift_bias;
> int amdgpu_use_xgmi_p2p = 1;
> int amdgpu_vcnfw_log;
> int amdgpu_sg_display = -1; /* auto */
> +int amdgpu_wbrf = -1;
>
> static void amdgpu_drv_delayed_reset_work_handler(struct work_struct *work);
>
> @@ -948,6 +949,24 @@ MODULE_PARM_DESC(smu_pptable_id,
> "specify pptable id to be used (-1 = auto(default) value, 0 = use pptable from vbios, > 0 = soft pptable id)");
> module_param_named(smu_pptable_id, amdgpu_smu_pptable_id, int, 0444);
>
> +#ifdef CONFIG_ACPI_WBRF
> +/**
> + * DOC: wbrf (int)
> + * Enable Wifi RFI interference mitigation feature.
> + * Due to electrical and mechanical constraints there may be likely interference of
> + * relatively high-powered harmonics of the (G-)DDR memory clocks with local radio
> + * module frequency bands used by Wifi 6/6e/7. To mitigate the possible RFI interference,
> + * with this feature enabled, PMFW will use either “shadowed P-State” or “P-State” based
> + * on active list of frequencies in-use (to be avoided) as part of initial setting or
> + * P-state transition. However, there may be potential performance impact with this
> + * feature enabled.
> + * (0 = disabled, 1 = enabled, -1 = auto (default setting, will be enabled if supported))
> + */
> +MODULE_PARM_DESC(wbrf,
> + "Enable Wifi RFI interference mitigation (0 = disabled, 1 = enabled, -1 = auto(default)");
> +module_param_named(wbrf, amdgpu_wbrf, int, 0444);
> +#endif
> +
> /* These devices are not supported by amdgpu.
> * They are supported by the mach64, r128, radeon drivers
> */
> diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> index 2ddf5198e5c4..89f876cc60e6 100644
> --- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> +++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> @@ -1188,6 +1188,163 @@ static int smu_get_thermal_temperature_range(struct smu_context *smu)
> return ret;
> }
>
> +/**
> + * smu_wbrf_handle_exclusion_ranges - consume the wbrf exclusion ranges
> + *
> + * @smu: smu_context pointer
> + *
> + * Retrieve the wbrf exclusion ranges and send them to PMFW for proper handling.
> + * Returns 0 on success, error on failure.
> + */
> +static int smu_wbrf_handle_exclusion_ranges(struct smu_context *smu)
> +{
> + struct wbrf_ranges_out wbrf_exclusion = {0};
> + struct exclusion_range *wifi_bands = wbrf_exclusion.band_list;
> + struct amdgpu_device *adev = smu->adev;
> + uint64_t start, end;
> + int ret, i, j;
> +
> + ret = amdgpu_acpi_wbrf_retrieve_exclusions(adev, &wbrf_exclusion);
> + if (ret) {
> + dev_err(adev->dev, "Failed to retrieve exclusion ranges!\n");
> + return ret;
> + }
> +
> + /*
> + * The exclusion ranges array we got might be filled with holes and duplicate
> + * entries. For example:
> + * {(2400, 2500), (0, 0), (6882, 6962), (2400, 2500), (0, 0), (6117, 6189), (0, 0)...}
> + * We need to do some sortups to eliminate those holes and duplicate entries.
> + * Expected output: {(2400, 2500), (6117, 6189), (6882, 6962), (0, 0)...}
> + */
> + for (i = 0; i < MAX_NUM_OF_WBRF_RANGES; i++) {
> + start = wifi_bands[i].start;
> + end = wifi_bands[i].end;
> +
> + /* get the last valid entry to fill the intermediate hole */
> + if (!start && !end) {
> + for (j = MAX_NUM_OF_WBRF_RANGES - 1; j > i; j--)
> + if (wifi_bands[j].start &&
> + wifi_bands[j].end)
> + break;
> +
> + if (j > i) {
> + wifi_bands[i].start = wifi_bands[j].start;
> + wifi_bands[i].end = wifi_bands[j].end;
> + wifi_bands[j].start = 0;
> + wifi_bands[j].end = 0;
> + }
> +
> + continue;
> + }
> +
> + /* eliminate duplicate entries */
> + for (j = i + 1; j < MAX_NUM_OF_WBRF_RANGES; j++) {
> + if ((wifi_bands[j].start == start) &&
> + (wifi_bands[j].end == end)) {
> + wifi_bands[j].start = 0;
> + wifi_bands[j].end = 0;
> + continue;
> + }
> + }
> + }
> +
> + /* Send the sorted wifi_bands to PMFW */
> + ret = smu_set_wbrf_exclusion_ranges(smu, wifi_bands);
> + /* Give it another chance */
> + if (unlikely(ret == -EBUSY)) {
> + mdelay(5);
> + ret = smu_set_wbrf_exclusion_ranges(smu, wifi_bands);
> + }
> +
> + return ret;
> +}
> +
> +/**
> + * smu_wbrf_event_handler - handle notify events
> + *
> + * @adev: struct amdgpu_device pointer
> + *
> + * Calls relevant amdgpu function in response to wbrf event
> + * notification from BIOS.
> + */
> +static void smu_wbrf_event_handler(struct amdgpu_device *adev)
> +{
> + struct smu_context *smu = adev->powerplay.pp_handle;
> +
> + smu_wbrf_handle_exclusion_ranges(smu);
> +}
> +
> +/**
> + * smu_wbrf_support_check - check wbrf support
> + *
> + * @smu: smu_context pointer
> + *
> + * Verifies the ACPI interface whether wbrf is supported.
> + */
> +static void smu_wbrf_support_check(struct smu_context *smu)
> +{
> + struct amdgpu_device *adev = smu->adev;
> +
> + smu->wbrf_supported = smu_is_asic_wbrf_supported(smu) &&
> + !!amdgpu_wbrf &&
> + amdgpu_acpi_is_wbrf_supported(adev);
> +
> + if (smu->wbrf_supported)
> + dev_info(adev->dev, "Enabled RF interference mitigations\n");
> +}
> +
> +/**
> + * smu_wbrf_init - init driver wbrf support
> + *
> + * @smu: smu_context pointer
> + *
> + * Verifies the AMD ACPI interfaces and registers with the wbrf
> + * notifier chain if wbrf feature is supported.
> + * Returns 0 on success, error on failure.
> + */
> +static int smu_wbrf_init(struct smu_context *smu)
> +{
> + struct amdgpu_device *adev = smu->adev;
> + int ret;
> +
> + if (!smu->wbrf_supported)
> + return 0;
> +
> + ret = amdgpu_acpi_register_wbrf_notify_handler(adev,
> + smu_wbrf_event_handler);
> + if (ret)
> + return ret;
> +
> + /*
> + * Some wifiband exclusion ranges may be already there
> + * before our driver loaded. To make sure our driver
> + * is awared of those exclusion ranges.
> + */
> + ret = smu_wbrf_handle_exclusion_ranges(smu);
> + if (ret)
> + dev_err(adev->dev, "Failed to handle wbrf exclusion ranges\n");
> +
> + return ret;
> +}
> +
> +/**
> + * smu_wbrf_fini - tear down driver wbrf support
> + *
> + * @smu: smu_context pointer
> + *
> + * Unregisters with the wbrf notifier chain.
> + */
> +static void smu_wbrf_fini(struct smu_context *smu)
> +{
> + struct amdgpu_device *adev = smu->adev;
> +
> + if (!smu->wbrf_supported)
> + return;
> +
> + amdgpu_acpi_unregister_wbrf_notify_handler(adev);
> +}
> +
> static int smu_smc_hw_setup(struct smu_context *smu)
> {
> struct smu_feature *feature = &smu->smu_feature;
> @@ -1280,6 +1437,15 @@ static int smu_smc_hw_setup(struct smu_context *smu)
> if (ret)
> return ret;
>
> + /* Enable UclkShadow on wbrf supported */
> + if (smu->wbrf_supported) {
> + ret = smu_enable_uclk_shadow(smu, true);
> + if (ret) {
> + dev_err(adev->dev, "Failed to enable UclkShadow feature to support wbrf!\n");
> + return ret;
> + }
> + }
> +
> /*
> * With SCPM enabled, these actions(and relevant messages) are
> * not needed and permitted.
> @@ -1376,6 +1542,15 @@ static int smu_smc_hw_setup(struct smu_context *smu)
> */
> ret = smu_set_min_dcef_deep_sleep(smu,
> smu->smu_table.boot_values.dcefclk / 100);
> + if (ret) {
> + dev_err(adev->dev, "Error setting min deepsleep dcefclk\n");
> + return ret;
> + }
> +
> + /* Init wbrf support. Properly setup the notifier */
> + ret = smu_wbrf_init(smu);
> + if (ret)
> + dev_err(adev->dev, "Error during wbrf init call\n");
>
> return ret;
> }
> @@ -1431,6 +1606,13 @@ static int smu_hw_init(void *handle)
> return ret;
> }
>
> + /*
> + * Check whether wbrf is supported. This needs to be done
> + * before SMU setup starts since part of SMU configuration
> + * relies on this.
> + */
> + smu_wbrf_support_check(smu);
> +
> if (smu->is_apu) {
> ret = smu_set_gfx_imu_enable(smu);
> if (ret)
> @@ -1583,6 +1765,8 @@ static int smu_smc_hw_cleanup(struct smu_context *smu)
> struct amdgpu_device *adev = smu->adev;
> int ret = 0;
>
> + smu_wbrf_fini(smu);
> +
> cancel_work_sync(&smu->throttling_logging_work);
> cancel_work_sync(&smu->interrupt_work);
>
> diff --git a/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h b/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h
> index 09469c750a96..ff0af3da0be2 100644
> --- a/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h
> +++ b/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h
> @@ -573,6 +573,9 @@ struct smu_context
> u32 debug_param_reg;
> u32 debug_msg_reg;
> u32 debug_resp_reg;
> +
> + /* data structures for wbrf feature support */
> + bool wbrf_supported;
> };
>
> struct i2c_adapter;
> @@ -1354,6 +1357,23 @@ struct pptable_funcs {
> * @init_pptable_microcode: Prepare the pptable microcode to upload via PSP
> */
> int (*init_pptable_microcode)(struct smu_context *smu);
> +
> + /**
> + * @is_asic_wbrf_supported: check whether PMFW supports the wbrf feature
> + */
> + bool (*is_asic_wbrf_supported)(struct smu_context *smu);
> +
> + /**
> + * @enable_uclk_shadow: Enable the uclk shadow feature on wbrf supported
> + */
> + int (*enable_uclk_shadow)(struct smu_context *smu,
> + bool enablement);
> +
> + /**
> + * @set_wbrf_exclusion_ranges: notify SMU the wifi bands occupied
> + */
> + int (*set_wbrf_exclusion_ranges)(struct smu_context *smu,
> + struct exclusion_range *exclusion_ranges);
> };
>
> typedef enum {
> diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu_internal.h b/drivers/gpu/drm/amd/pm/swsmu/smu_internal.h
> index ceb13c838067..67d7495ab49e 100644
> --- a/drivers/gpu/drm/amd/pm/swsmu/smu_internal.h
> +++ b/drivers/gpu/drm/amd/pm/swsmu/smu_internal.h
> @@ -97,6 +97,9 @@
> #define smu_get_default_config_table_settings(smu, config_table) smu_ppt_funcs(get_default_config_table_settings, -EOPNOTSUPP, smu, config_table)
> #define smu_set_config_table(smu, config_table) smu_ppt_funcs(set_config_table, -EOPNOTSUPP, smu, config_table)
> #define smu_init_pptable_microcode(smu) smu_ppt_funcs(init_pptable_microcode, 0, smu)
> +#define smu_is_asic_wbrf_supported(smu) smu_ppt_funcs(is_asic_wbrf_supported, false, smu)
> +#define smu_enable_uclk_shadow(smu, enablement) smu_ppt_funcs(enable_uclk_shadow, 0, smu, enablement)
> +#define smu_set_wbrf_exclusion_ranges(smu, exclusion_ranges) smu_ppt_funcs(set_wbrf_exclusion_ranges, -EOPNOTSUPP, smu, exclusion_ranges)
>
> #endif
> #endif
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