On 13 July 2017 at 12:22, 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 | 25 +++
> drivers/gpu/drm/i915/i915_perf.c | 351 ++++++++++++++++++++++++++++++++++++++-
> drivers/gpu/drm/i915/i915_reg.h | 2 +
> include/uapi/drm/i915_drm.h | 24 +++
> 5 files changed, 403 insertions(+), 1 deletion(-)
>
> 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 0c45a89d165e..3d62276d9fad 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2037,6 +2037,25 @@ 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.
> *
> @@ -2427,6 +2446,8 @@ struct drm_i915_private {
> struct mutex lock;
> struct list_head streams;
>
> + struct idr metrics_idr;
> +
> struct {
> struct i915_perf_stream *exclusive_stream;
>
> @@ -3595,6 +3616,10 @@ 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 d4647b3d8119..5f3d544a93cf 100644
> --- a/drivers/gpu/drm/i915/i915_perf.c
> +++ b/drivers/gpu/drm/i915/i915_perf.c
> @@ -2652,7 +2652,7 @@ static struct i915_oa_config *get_oa_config(struct drm_i915_private *dev_priv,
> if (metrics_set == 1)
> return &dev_priv->perf.oa.test_config;
>
> - return NULL;
> + return idr_find(&dev_priv->perf.metrics_idr, metrics_set);
> }
>
> /**
> @@ -2913,6 +2913,7 @@ void i915_perf_register(struct drm_i915_private *dev_priv)
> &dev_priv->perf.oa.test_config.sysfs_metric);
> if (ret)
> goto sysfs_error;
> +
> goto exit;
>
> sysfs_error:
> @@ -2944,6 +2945,333 @@ 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)
> +{
> + struct i915_oa_reg *oa_regs;
> + int err, i;
> +
> + if (!n_regs)
> + return NULL;
> +
> + /* No is_valid function means we're not allowing any register to be programmed. */
> + GEM_BUG_ON(!is_valid);
> + 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++) {
I think in a bunch of places we mix u32/int for n_regs, make it
consistent now that user-space can set this?
> + u32 addr, value;
> +
> + err = get_user(addr, regs);
> + if (err)
> + goto addr_err;
> +
> + if (!is_valid(dev_priv, addr)) {
> + DRM_DEBUG("Invalid oa_reg address: %X\n", addr);
> + err = -EINVAL;
> + goto addr_err;
> + }
> +
> + err = get_user(value, regs + 1);
> + if (err)
> + goto addr_err;
> +
> + oa_regs[i].addr = _MMIO(addr);
> + oa_regs[i].value = value;
> +
> + regs += 2;
> + }
> +
> + return oa_regs;
> +
> +addr_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_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_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->uuid;
> + oa_config->sysfs_metric.attrs = oa_config->attrs;
> +
> + return sysfs_create_group(dev_priv->perf.metrics_kobj,
> + &oa_config->sysfs_metric);
> +}
> +
> +static int destroy_config(int id, void *p, void *data)
> +{
> + struct drm_i915_private *dev_priv = data;
> + struct i915_oa_config *oa_config = p;
> +
> + sysfs_remove_group(dev_priv->perf.metrics_kobj,
> + &oa_config->sysfs_metric);
> + kfree(oa_config->flex_regs);
> + kfree(oa_config->b_counter_regs);
> + kfree(oa_config->mux_regs);
> + kfree(oa_config);
> +
> + return 0;
> +}
> +
> +int i915_perf_add_config_ioctl(struct drm_device *dev, void *data,
> + struct drm_file *file)
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct drm_i915_perf_oa_config *args = data;
> + struct i915_oa_config *oa_config, *tmp;
> + unsigned int x1, x2, x3, x4, x5;
> + int err, id;
> +
> + if (!dev_priv->perf.initialized) {
> + DRM_DEBUG("i915 perf interface not available for this system\n");
> + return -ENOTSUPP;
> + }
> +
> + if (!dev_priv->perf.metrics_kobj) {
> + DRM_DEBUG("OA metrics weren't advertised via sysfs\n");
> + return -EINVAL;
> + }
> +
> + if (!capable(CAP_SYS_ADMIN)) {
> + DRM_DEBUG("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_DEBUG("No OA registers given\n");
> + return -EINVAL;
> + }
> +
> + oa_config = kzalloc(sizeof(*oa_config), GFP_KERNEL);
> + if (!oa_config) {
> + DRM_DEBUG("Failed to allocate memory for the OA config\n");
> + return -ENOMEM;
> + }
> +
> + err = strncpy_from_user(oa_config->uuid, u64_to_user_ptr(args->uuid),
> + sizeof(oa_config->uuid));
I think we'll need to do:
struct i915_oa_config {
char uuid[UUID_STRING_LEN+1];
};
strncpy_from_user(oa_config->uuid, u64_to_user_ptr(args->uuid),
UUID_STRING_LEN);
Hmm, alternatively we might want to consider using uuid_t, maybe just
for the user-space portion, once that lands in tip, not sure how
worthwhile that would be though...
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