Re: [PATCH 1/2] drm/i915: Implement I915_PERF_ADD/REMOVE_CONFIG interface

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On 7 July 2017 at 18:08, Lionel Landwerlin
<lionel.g.landwerlin@xxxxxxxxx> wrote:
> From: Matthew Auld <matthew.auld@xxxxxxxxx>
>
> The motivation behind this new interface is expose at runtime the
> creation of new OA configs which can be used as part of the i915 perf
> open interface. This will enable the kernel to learn new configs which
> may be experimental, or otherwise not part of the core set currently
> available through the i915 perf interface.
>
> This will relieve the kernel from holding all the possible configs, so
> we can leave only the test configs here.
>
> Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
> Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>
> Signed-off-by: Andrzej Datczuk <andrzej.datczuk@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/i915_drv.c  |   2 +
>  drivers/gpu/drm/i915/i915_drv.h  |  30 +++
>  drivers/gpu/drm/i915/i915_perf.c | 391 ++++++++++++++++++++++++++++++++++++++-
>  drivers/gpu/drm/i915/i915_reg.h  |   2 +
>  include/uapi/drm/i915_drm.h      |  21 +++
>  5 files changed, 441 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index d310d8245dca..a3d339670ec1 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -2730,6 +2730,8 @@ static const struct drm_ioctl_desc i915_ioctls[] = {
>         DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_GETPARAM, i915_gem_context_getparam_ioctl, DRM_RENDER_ALLOW),
>         DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_SETPARAM, i915_gem_context_setparam_ioctl, DRM_RENDER_ALLOW),
>         DRM_IOCTL_DEF_DRV(I915_PERF_OPEN, i915_perf_open_ioctl, DRM_RENDER_ALLOW),
> +       DRM_IOCTL_DEF_DRV(I915_PERF_ADD_CONFIG, i915_perf_add_config_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> +       DRM_IOCTL_DEF_DRV(I915_PERF_REMOVE_CONFIG, i915_perf_remove_config_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
>  };
>
>  static struct drm_driver driver = {
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 81cd21ecfa7d..ce733c2db963 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2009,6 +2009,11 @@ struct i915_perf_stream {
>          * type of configured stream.
>          */
>         const struct i915_perf_stream_ops *ops;
> +
> +       /**
> +        * @metrics_set: The ID of the config used by the stream.
> +        */
> +       int metrics_set;
>  };
>
>  /**
> @@ -2016,6 +2021,25 @@ struct i915_perf_stream {
>   */
>  struct i915_oa_ops {
>         /**
> +        * @is_valid_b_counter_reg: Validates register's address for
> +        * programming boolean counters for a particular platform.
> +        */
> +       bool (*is_valid_b_counter_reg)(struct drm_i915_private *dev_priv,
> +                                      u32 addr);
> +
> +       /**
> +        * @is_valid_mux_reg: Validates register's address for programming mux
> +        * for a particular platform.
> +        */
> +       bool (*is_valid_mux_reg)(struct drm_i915_private *dev_priv, u32 addr);
> +
> +       /**
> +        * @is_valid_flex_reg: Validates register's address for programming
> +        * flex EU filtering for a particular platform.
> +        */
> +       bool (*is_valid_flex_reg)(struct drm_i915_private *dev_priv, u32 addr);
> +
> +       /**
>          * @init_oa_buffer: Resets the head and tail pointers of the
>          * circular buffer for periodic OA reports.
>          *
> @@ -2413,6 +2437,8 @@ struct drm_i915_private {
>                 struct mutex lock;
>                 struct list_head streams;
>
> +               struct idr metrics_idr;
> +
>                 struct {
>                         struct i915_perf_stream *exclusive_stream;
>
> @@ -3589,6 +3615,10 @@ i915_gem_context_lookup_timeline(struct i915_gem_context *ctx,
>
>  int i915_perf_open_ioctl(struct drm_device *dev, void *data,
>                          struct drm_file *file);
> +int i915_perf_add_config_ioctl(struct drm_device *dev, void *data,
> +                              struct drm_file *file);
> +int i915_perf_remove_config_ioctl(struct drm_device *dev, void *data,
> +                                 struct drm_file *file);
>  void i915_oa_init_reg_state(struct intel_engine_cs *engine,
>                             struct i915_gem_context *ctx,
>                             uint32_t *reg_state);
> diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
> index d9f77a4d85db..92cb6a7568e7 100644
> --- a/drivers/gpu/drm/i915/i915_perf.c
> +++ b/drivers/gpu/drm/i915/i915_perf.c
> @@ -357,6 +357,23 @@ struct perf_open_properties {
>         int oa_period_exponent;
>  };
>
> +struct i915_oa_dynamic_config
> +{
> +       char guid[40];
> +       int id;
> +
> +       const struct i915_oa_reg *mux_regs;
> +       int mux_regs_len;
> +       const struct i915_oa_reg *b_counter_regs;
> +       int b_counter_regs_len;
> +       const struct i915_oa_reg *flex_regs;
> +       int flex_regs_len;
> +
> +       struct attribute_group sysfs_metric;
> +       struct attribute *attrs[2];
> +       struct device_attribute sysfs_metric_id;
> +};
> +
>  static u32 gen8_oa_hw_tail_read(struct drm_i915_private *dev_priv)
>  {
>         return I915_READ(GEN8_OATAILPTR) & GEN8_OATAILPTR_MASK;
> @@ -1451,11 +1468,39 @@ static void config_oa_regs(struct drm_i915_private *dev_priv,
>         }
>  }
>
> +int select_dynamic_metric_set(struct drm_i915_private *dev_priv)
> +{
> +       struct i915_oa_dynamic_config *oa_config;
> +
> +       oa_config = idr_find(&dev_priv->perf.metrics_idr,
> +                            dev_priv->perf.oa.metrics_set);
> +       if (!oa_config) {
> +               return -EINVAL;
> +       }
> +
> +       dev_priv->perf.oa.n_mux_configs = 1;
> +       dev_priv->perf.oa.mux_regs[0] = oa_config->mux_regs;
> +       dev_priv->perf.oa.mux_regs_lens[0] = oa_config->mux_regs_len;
> +
> +       dev_priv->perf.oa.b_counter_regs = oa_config->b_counter_regs;
> +       dev_priv->perf.oa.b_counter_regs_len = oa_config->b_counter_regs_len;
> +
> +       dev_priv->perf.oa.flex_regs = oa_config->flex_regs;
> +       dev_priv->perf.oa.flex_regs_len = oa_config->flex_regs_len;
> +
> +       return 0;
> +}
> +
>  static int hsw_enable_metric_set(struct drm_i915_private *dev_priv)
>  {
> -       int ret = i915_oa_select_metric_set_hsw(dev_priv);
> +       int ret;
>         int i;
>
> +       if (dev_priv->perf.oa.metrics_set > dev_priv->perf.oa.n_builtin_sets)
> +               ret = select_dynamic_metric_set(dev_priv);
> +       else
> +               ret = i915_oa_select_metric_set_hsw(dev_priv);
> +
>         if (ret)
>                 return ret;
>
> @@ -1776,8 +1821,12 @@ static int gen8_configure_all_contexts(struct drm_i915_private *dev_priv,
>
>  static int gen8_enable_metric_set(struct drm_i915_private *dev_priv)
>  {
> -       int ret = dev_priv->perf.oa.ops.select_metric_set(dev_priv);
> -       int i;
> +       int ret, i;
> +
> +       if (dev_priv->perf.oa.metrics_set > dev_priv->perf.oa.n_builtin_sets)
> +               ret = select_dynamic_metric_set(dev_priv);
> +       else
> +               ret = dev_priv->perf.oa.ops.select_metric_set(dev_priv);
>
>         if (ret)
>                 return ret;
> @@ -2055,7 +2104,7 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
>         dev_priv->perf.oa.oa_buffer.format =
>                 dev_priv->perf.oa.oa_formats[props->oa_format].format;
>
> -       dev_priv->perf.oa.metrics_set = props->metrics_set;
> +       dev_priv->perf.oa.metrics_set = stream->metrics_set = props->metrics_set;
>
>         dev_priv->perf.oa.periodic = props->oa_periodic;
>         if (dev_priv->perf.oa.periodic)
> @@ -2713,7 +2762,9 @@ static int read_properties_unlocked(struct drm_i915_private *dev_priv,
>                         break;
>                 case DRM_I915_PERF_PROP_OA_METRICS_SET:
>                         if (value == 0 ||
> -                           value > dev_priv->perf.oa.n_builtin_sets) {
> +                           (value > dev_priv->perf.oa.n_builtin_sets &&
> +                            idr_find(&dev_priv->perf.metrics_idr,
> +                                     value) == NULL)) {
>                                 DRM_DEBUG("Unknown OA metric set ID\n");
>                                 return -EINVAL;
>                         }
> @@ -2957,6 +3008,321 @@ void i915_perf_unregister(struct drm_i915_private *dev_priv)
>         dev_priv->perf.metrics_kobj = NULL;
>  }
>
> +static bool gen8_is_valid_flex_addr(struct drm_i915_private *dev_priv, u32 addr)
> +{
> +       static const i915_reg_t flex_eu_regs[] = {
> +               EU_PERF_CNTL0,
> +               EU_PERF_CNTL1,
> +               EU_PERF_CNTL2,
> +               EU_PERF_CNTL3,
> +               EU_PERF_CNTL4,
> +               EU_PERF_CNTL5,
> +               EU_PERF_CNTL6,
> +       };
> +       int i;
> +
> +       for (i = 0; i < ARRAY_SIZE(flex_eu_regs); i++) {
> +               if (flex_eu_regs[i].reg == addr)
> +                       return true;
> +       }
> +       return false;
> +}
> +
> +static bool gen7_is_valid_b_counter_addr(struct drm_i915_private *dev_priv, u32 addr)
> +{
> +       return (addr >= 0x2380 && addr <= 0x27ac);
> +}
> +
> +static bool gen7_is_valid_mux_addr(struct drm_i915_private *dev_priv, u32 addr)
> +{
> +       return addr == NOA_WRITE.reg ||
> +               (addr >= 0xd0c && addr <= 0xd3c) ||
> +               (addr >= 0x25100 && addr <= 0x2FB9C);
> +}
> +
> +static bool hsw_is_valid_mux_addr(struct drm_i915_private *dev_priv, u32 addr)
> +{
> +       return (addr >= 0x25100 && addr <= 0x2FF90) ||
> +               gen7_is_valid_mux_addr(dev_priv, addr);
> +}
> +
> +static bool chv_is_valid_mux_addr(struct drm_i915_private *dev_priv, u32 addr)
> +{
> +       return (addr >= 0x182300 && addr <= 0x1823A4) ||
> +               gen7_is_valid_mux_addr(dev_priv, addr);
> +}
> +
> +static struct i915_oa_reg *alloc_oa_regs(struct drm_i915_private *dev_priv,
> +                                        bool (*is_valid)(struct drm_i915_private *dev_priv, u32 addr),
> +                                        u32 __user *regs,
> +                                        u32 n_regs)
> +{
> +       int err;
> +       int i;
> +       struct i915_oa_reg *oa_regs;
> +
> +       if (!n_regs)
> +               return NULL;
> +
> +       if (!is_valid)
> +               return ERR_PTR(-EINVAL);
> +
> +       oa_regs = kmalloc(sizeof(*oa_regs) * n_regs, GFP_KERNEL);
> +       if (!oa_regs)
> +               return ERR_PTR(-ENOMEM);
> +
> +       for (i = 0; i < n_regs; i++) {
> +               int ret;
> +               u32 addr, value;
> +
> +               ret = get_user(addr, regs);
> +               if (ret) {
> +                       err = ret;
> +                       goto addr_err;
> +               }
> +
> +               if (!is_valid(dev_priv, addr)) {
> +                       DRM_ERROR("Invalid oa_reg address: %X\n", addr);
DRM_ERROR's shouldn't be user-triggerable, elsewhere also.

> +                       err = -EINVAL;
> +                       goto addr_err;
> +               }
> +
> +               ret = get_user(value, regs + 1);
> +               if (ret) {
> +                       err = ret;
> +                       goto value_err;
> +               }
> +
> +               oa_regs[i].addr = _MMIO(addr);
> +               oa_regs[i].value = value;
> +
> +               regs += 2;
> +       }
> +
> +       return oa_regs;
> +
> +addr_err:
> +value_err:
> +       kfree(oa_regs);
> +       return ERR_PTR(err);
> +}
> +
> +static ssize_t show_dynamic_id(struct device *dev,
> +                              struct device_attribute *attr,
> +                              char *buf)
> +{
> +       struct i915_oa_dynamic_config *oa_config =
> +               container_of(attr, typeof(*oa_config), sysfs_metric_id);
> +
> +       return sprintf(buf, "%d\n", oa_config->id);
> +}
> +
> +static int create_dynamic_oa_sysfs_entry(struct drm_i915_private *dev_priv,
> +                                        struct i915_oa_dynamic_config *oa_config)
> +{
> +       oa_config->sysfs_metric_id.attr.name = "id";
> +       oa_config->sysfs_metric_id.attr.mode = S_IRUGO;
> +       oa_config->sysfs_metric_id.show = show_dynamic_id;
> +       oa_config->sysfs_metric_id.store = NULL;
> +
> +       oa_config->attrs[0] = &oa_config->sysfs_metric_id.attr;
> +       oa_config->attrs[1] = NULL;
> +
> +       oa_config->sysfs_metric.name = oa_config->guid;
> +       oa_config->sysfs_metric.attrs = oa_config->attrs;
> +
> +       return sysfs_create_group(dev_priv->perf.metrics_kobj,
> +                                 &oa_config->sysfs_metric);
> +}
> +
> +int i915_perf_add_config_ioctl(struct drm_device *dev, void *data,
> +                              struct drm_file *file)
> +{
> +       int err;
> +       struct drm_i915_private *dev_priv = dev->dev_private;
> +       struct drm_i915_perf_oa_config *args = data;
> +       struct i915_oa_dynamic_config *oa_config, *tmp;
> +       int id;
> +       unsigned int x1, x2, x3, x4, x5;
> +
> +       if (!dev_priv->perf.initialized) {
> +               DRM_DEBUG("i915 perf interface not available for this system\n");
> +               return -ENOTSUPP;
> +       }
> +
> +       if (!capable(CAP_SYS_ADMIN)) {
> +               DRM_ERROR("Insufficient privileges to add i915 OA config\n");
> +               return -EACCES;
> +       }
> +
> +       if ((!args->mux_regs || !args->n_mux_regs) &&
> +           (!args->boolean_regs || !args->n_boolean_regs) &&
> +           (!args->flex_regs || !args->n_flex_regs)) {
> +               DRM_ERROR("No OA registers given\n");
> +               return -EINVAL;
> +       }
> +
> +       oa_config = kzalloc(sizeof(*oa_config), GFP_KERNEL);
> +       if (!oa_config) {
> +               DRM_ERROR("Failed to allocate memory for the OA config\n");
> +               return -ENOMEM;
> +       }
> +
> +       err = strncpy_from_user(oa_config->guid, u64_to_user_ptr(args->uuid),
> +                               sizeof(oa_config->guid));
> +       if (err < 0) {
> +               DRM_ERROR("Failed to copy uuid from OA config\n");
> +               goto uuid_err;
> +       }
> +
> +       if (sscanf(oa_config->guid, "%08x-%04x-%04x-%04x-%012x", &x1, &x2, &x3,
> +                  &x4, &x5) != 5) {
> +               DRM_ERROR("Invalid uuid format for OA config\n");
> +               err = -EINVAL;
> +               goto uuid_err;
> +       }
> +
> +       oa_config->mux_regs_len = args->n_mux_regs;
> +       oa_config->mux_regs =
> +               alloc_oa_regs(dev_priv,
> +                             dev_priv->perf.oa.ops.is_valid_mux_reg,
> +                             u64_to_user_ptr(args->mux_regs),
> +                             args->n_mux_regs);
> +
> +       if (IS_ERR(oa_config->mux_regs)) {
> +               DRM_ERROR("Failed to create OA config for mux_regs\n");
> +               err = PTR_ERR(oa_config->mux_regs);
> +               goto mux_err;
> +       }
> +
> +       oa_config->b_counter_regs_len = args->n_boolean_regs;
> +       oa_config->b_counter_regs =
> +               alloc_oa_regs(dev_priv,
> +                             dev_priv->perf.oa.ops.is_valid_b_counter_reg,
> +                             u64_to_user_ptr(args->boolean_regs),
> +                             args->n_boolean_regs);
> +
> +       if (IS_ERR(oa_config->b_counter_regs)) {
> +               DRM_ERROR("Failed to create OA config for b_counter_regs\n");
> +               err = PTR_ERR(oa_config->b_counter_regs);
> +               goto boolean_err;
> +       }
> +
> +       if (INTEL_GEN(dev_priv) < 8) {
> +               if (args->n_flex_regs != 0)
> +                       goto flex_err;
> +       } else {
> +               oa_config->flex_regs_len = args->n_flex_regs;
> +               oa_config->flex_regs =
> +                       alloc_oa_regs(dev_priv,
> +                                     dev_priv->perf.oa.ops.is_valid_flex_reg,
> +                                     u64_to_user_ptr(args->flex_regs),
> +                                     args->n_flex_regs);
> +
> +               if (IS_ERR(oa_config->flex_regs)) {
> +                       DRM_ERROR("Failed to create OA config for flex_regs\n");
> +                       err = PTR_ERR(oa_config->flex_regs);
> +                       goto flex_err;
> +               }
> +       }
> +
> +       err = i915_mutex_lock_interruptible(dev);
> +       if (err)
> +               goto lock_err;
> +
> +       idr_for_each_entry(&dev_priv->perf.metrics_idr, tmp, id) {
> +               if (!strcmp(tmp->guid, oa_config->guid)) {
> +                       DRM_ERROR("OA config already exists with this uuid\n");
> +                       err = -EADDRINUSE;
> +                       goto sysfs_err;
> +               }
> +       }
> +
> +       err = create_dynamic_oa_sysfs_entry(dev_priv, oa_config);
> +       if (err) {
> +               DRM_ERROR("Failed to create sysfs entry for OA config\n");
> +               goto sysfs_err;
> +       }
> +
> +       oa_config->id = idr_alloc(&dev_priv->perf.metrics_idr,
> +                                 oa_config,
> +                                 dev_priv->perf.oa.n_builtin_sets + 1,
> +                                 0, GFP_KERNEL);
> +
> +       mutex_unlock(&dev->struct_mutex);
> +
> +       return oa_config->id;
> +
> +sysfs_err:
> +       mutex_unlock(&dev->struct_mutex);
> +lock_err:
> +       kfree(oa_config->flex_regs);
> +flex_err:
> +       kfree(oa_config->b_counter_regs);
> +boolean_err:
> +       kfree(oa_config->mux_regs);
> +mux_err:
> +uuid_err:
> +       kfree(oa_config);
> +
> +       DRM_ERROR("Failed to add new OA config\n");
> +       return err;
> +}
> +
> +int i915_perf_remove_config_ioctl(struct drm_device *dev, void *data,
> +                                 struct drm_file *file)
> +{
> +       struct drm_i915_private *dev_priv = dev->dev_private;
> +       u64 *arg = data;
> +       struct i915_oa_dynamic_config *oa_config;
> +       int ret;
> +
> +       if (!dev_priv->perf.initialized) {
> +               DRM_DEBUG("i915 perf interface not available for this system\n");
> +               return -ENOTSUPP;
> +       }
> +
> +       if (!capable(CAP_SYS_ADMIN)) {
> +               DRM_ERROR("Insufficient privileges to remove i915 OA config\n");
> +               return -EACCES;
> +       }
> +
> +       ret = i915_mutex_lock_interruptible(dev);
> +       if (ret)
> +               goto lock_err;
> +
> +       if (dev_priv->perf.oa.exclusive_stream &&
> +           dev_priv->perf.oa.exclusive_stream->metrics_set == *arg) {
> +               DRM_ERROR("Failed to remove config in use\n");
> +               ret = -EADDRINUSE;
> +               goto config_err;
> +       }
> +
> +       oa_config = idr_find(&dev_priv->perf.metrics_idr, *arg);
> +       if (!oa_config) {
> +               DRM_ERROR("Failed to remove unknown config\n");
> +               ret = -EINVAL;
> +               goto config_err;
> +       }
> +
> +       idr_remove(&dev_priv->perf.metrics_idr, *arg);
> +
> +       sysfs_remove_group(dev_priv->perf.metrics_kobj,
> +                          &oa_config->sysfs_metric);
> +       if (oa_config->flex_regs)
> +               kfree(oa_config->flex_regs);
> +       if (oa_config->b_counter_regs)
> +               kfree(oa_config->b_counter_regs);
> +       if (oa_config->mux_regs)
> +               kfree(oa_config->mux_regs);
> +       kfree(oa_config);
> +
> +config_err:
> +       mutex_unlock(&dev->struct_mutex);
> +lock_err:
> +       return ret;
> +}
> +
>  static struct ctl_table oa_table[] = {
>         {
>          .procname = "perf_stream_paranoid",
> @@ -3011,8 +3377,14 @@ static struct ctl_table dev_root[] = {
>  void i915_perf_init(struct drm_i915_private *dev_priv)
>  {
>         dev_priv->perf.oa.n_builtin_sets = 0;
> +       idr_init(&dev_priv->perf.metrics_idr);
>
>         if (IS_HASWELL(dev_priv)) {
> +               dev_priv->perf.oa.ops.is_valid_b_counter_reg =
> +                       gen7_is_valid_b_counter_addr;
> +               dev_priv->perf.oa.ops.is_valid_mux_reg =
> +                       hsw_is_valid_mux_addr;
> +               dev_priv->perf.oa.ops.is_valid_flex_reg = NULL;
>                 dev_priv->perf.oa.ops.init_oa_buffer = gen7_init_oa_buffer;
>                 dev_priv->perf.oa.ops.enable_metric_set = hsw_enable_metric_set;
>                 dev_priv->perf.oa.ops.disable_metric_set = hsw_disable_metric_set;
> @@ -3036,6 +3408,13 @@ void i915_perf_init(struct drm_i915_private *dev_priv)
>                  * execlist mode by default.
>                  */
>
> +               dev_priv->perf.oa.ops.is_valid_b_counter_reg =
> +                       gen7_is_valid_b_counter_addr;
> +               dev_priv->perf.oa.ops.is_valid_mux_reg =
> +                       gen7_is_valid_mux_addr;
> +               dev_priv->perf.oa.ops.is_valid_flex_reg =
> +                       gen8_is_valid_flex_addr;
> +
>                 if (IS_GEN8(dev_priv)) {
>                         dev_priv->perf.oa.ctx_oactxctrl_offset = 0x120;
>                         dev_priv->perf.oa.ctx_flexeu0_offset = 0x2ce;
> @@ -3050,6 +3429,8 @@ void i915_perf_init(struct drm_i915_private *dev_priv)
>                                 dev_priv->perf.oa.ops.select_metric_set =
>                                         i915_oa_select_metric_set_bdw;
>                         } else if (IS_CHERRYVIEW(dev_priv)) {
> +                               dev_priv->perf.oa.ops.is_valid_mux_reg =
> +                                       chv_is_valid_mux_addr;
>                                 dev_priv->perf.oa.n_builtin_sets =
>                                         i915_oa_n_builtin_metric_sets_chv;
>                                 dev_priv->perf.oa.ops.select_metric_set =
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 21ab12f4e72a..433fcd7beb72 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -732,6 +732,8 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
>  #define GDT_CHICKEN_BITS    _MMIO(0x9840)
>  #define GT_NOA_ENABLE      0x00000080
>
> +#define NOA_WRITE           _MMIO(0x9888)
> +
>  /*
>   * OA Boolean state
>   */
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index 7ccbd6a2bbe0..e2ff47732303 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -260,6 +260,8 @@ typedef struct _drm_i915_sarea {
>  #define DRM_I915_GEM_CONTEXT_GETPARAM  0x34
>  #define DRM_I915_GEM_CONTEXT_SETPARAM  0x35
>  #define DRM_I915_PERF_OPEN             0x36
> +#define DRM_I915_PERF_ADD_CONFIG       0x37
> +#define DRM_I915_PERF_REMOVE_CONFIG    0x38
>
>  #define DRM_IOCTL_I915_INIT            DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT, drm_i915_init_t)
>  #define DRM_IOCTL_I915_FLUSH           DRM_IO ( DRM_COMMAND_BASE + DRM_I915_FLUSH)
> @@ -315,6 +317,8 @@ typedef struct _drm_i915_sarea {
>  #define DRM_IOCTL_I915_GEM_CONTEXT_GETPARAM    DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_GETPARAM, struct drm_i915_gem_context_param)
>  #define DRM_IOCTL_I915_GEM_CONTEXT_SETPARAM    DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_CONTEXT_SETPARAM, struct drm_i915_gem_context_param)
>  #define DRM_IOCTL_I915_PERF_OPEN       DRM_IOW(DRM_COMMAND_BASE + DRM_I915_PERF_OPEN, struct drm_i915_perf_open_param)
> +#define DRM_IOCTL_I915_PERF_ADD_CONFIG DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_PERF_ADD_CONFIG, struct drm_i915_perf_oa_config)
> +#define DRM_IOCTL_I915_PERF_REMOVE_CONFIG      DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_PERF_REMOVE_CONFIG, __u64)
>
>  /* Allow drivers to submit batchbuffers directly to hardware, relying
>   * on the security mechanisms provided by hardware.
> @@ -1467,6 +1471,23 @@ enum drm_i915_perf_record_type {
>         DRM_I915_PERF_RECORD_MAX /* non-ABI */
>  };
>
> +/**
> + * Structure to upload perf dynamic configuration into the kernel.
> + */
> +struct drm_i915_perf_oa_config {
> +       /* string formatted like "%08x-%04x-%04x-%04x-%012x" **/
> +       __u64 __user uuid;
> +
> +       __u32 n_mux_regs;
> +       __u64 __user mux_regs;
> +
> +       __u32 n_boolean_regs;
> +       __u64 __user boolean_regs;
> +
> +       __u32 n_flex_regs;
> +       __u64 __user flex_regs;
This needs padding.

> +};
> +
>  #if defined(__cplusplus)
>  }
>  #endif
> --
> 2.13.2
>
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> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
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