[Intel-gfx] [PATCH] drm/i915: Introduce FBC False Color for debug purposes.
Daniel Vetter
daniel at ffwll.ch
Mon Jul 7 16:59:09 CEST 2014
On Fri, Jun 20, 2014 at 06:46:06AM -0700, Rodrigo Vivi wrote:
> With this bit enabled, HW changes the color when compressing frames for
> debug purposes.
>
> ALthough the simple way to enable a single bit is over intel_reg_write,
> this value is overwriten on next update_fbc so depending on the workload
> it is not possible to set this bit with intel-gpu-tools. So this patch
> introduces a persistent way to enable false color over debugfs.
>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
DEFINE_SIMPLE_ATTRIBUTE allows you do ditch a lot of boilerplate here.
Otherwise looks good and useful, please resubmit with that change and
volunteer someone for review.
-Daniel
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 70 +++++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/i915_drv.h | 2 ++
> drivers/gpu/drm/i915/i915_reg.h | 1 +
> drivers/gpu/drm/i915/intel_pm.c | 6 ++++
> 4 files changed, 79 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 6b7b32b..c2019a6 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -1508,6 +1508,75 @@ static int i915_fbc_status(struct seq_file *m, void *unused)
> return 0;
> }
>
> +static int i915_fbc_fc_show(struct seq_file *m, void *data)
> +{
> + struct drm_device *dev = m->private;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> +
> + drm_modeset_lock_all(dev);
> + seq_printf(m, "False Color: %s\n", yesno(dev_priv->fbc.false_color));
> + drm_modeset_unlock_all(dev);
> +
> + return 0;
> +}
> +
> +static int i915_fbc_fc_open(struct inode *inode, struct file *file)
> +{
> + struct drm_device *dev = inode->i_private;
> +
> + if (INTEL_INFO(dev)->gen < 5)
> + return -ENODEV;
> +
> + return single_open(file, i915_fbc_fc_show, dev);
> +}
> +
> +static ssize_t i915_fbc_fc_write(struct file *file, const char __user *ubuf,
> + size_t len, loff_t *offp)
> +{
> + struct seq_file *m = file->private_data;
> + struct drm_device *dev = m->private;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + int ret;
> + char tmp[2];
> + int false_color;
> + u32 val;
> +
> + if (len > 2)
> + return -EINVAL;
> +
> + if (copy_from_user(tmp, ubuf, len))
> + return -EFAULT;
> +
> + tmp[1] = '\0';
> +
> + ret = sscanf(tmp, "%d", &false_color);
> + if (ret != 1)
> + return -EINVAL;
> +
> + drm_modeset_lock_all(dev);
> +
> + val = I915_READ(ILK_DPFC_CONTROL);
> + dev_priv->fbc.false_color = false_color;
> +
> + I915_WRITE(ILK_DPFC_CONTROL, false_color ?
> + (val | FBC_CTL_FALSE_COLOR) :
> + (val & ~FBC_CTL_FALSE_COLOR));
> +
> + drm_modeset_unlock_all(dev);
> +
> + return len;
> +}
> +
> +static const struct file_operations i915_fbc_fops = {
> + .release = single_release,
> + .owner = THIS_MODULE,
> + .read = seq_read,
> + .open = i915_fbc_fc_open,
> + .llseek = seq_lseek,
> + .release = single_release,
> + .write = i915_fbc_fc_write,
> +};
> +
> static int i915_ips_status(struct seq_file *m, void *unused)
> {
> struct drm_info_node *node = m->private;
> @@ -3858,6 +3927,7 @@ static const struct i915_debugfs_files {
> {"i915_pri_wm_latency", &i915_pri_wm_latency_fops},
> {"i915_spr_wm_latency", &i915_spr_wm_latency_fops},
> {"i915_cur_wm_latency", &i915_cur_wm_latency_fops},
> + {"i915_fbc_false_color", &i915_fbc_fops},
> };
>
> void intel_display_crc_init(struct drm_device *dev)
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 8cea596..ec24b15 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -607,6 +607,8 @@ struct i915_fbc {
> struct drm_mm_node *compressed_fb;
> struct drm_mm_node *compressed_llb;
>
> + bool false_color;
> +
> struct intel_fbc_work {
> struct delayed_work work;
> struct drm_crtc *crtc;
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 3488567..c70df22 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -1495,6 +1495,7 @@ enum punit_power_well {
> /* Framebuffer compression for Ironlake */
> #define ILK_DPFC_CB_BASE 0x43200
> #define ILK_DPFC_CONTROL 0x43208
> +#define FBC_CTL_FALSE_COLOR (1<<10)
> /* The bit 28-8 is reserved */
> #define DPFC_RESERVED (0x1FFFFF00)
> #define ILK_DPFC_RECOMP_CTL 0x4320c
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index d771e82..216cb19 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -236,6 +236,9 @@ static void ironlake_enable_fbc(struct drm_crtc *crtc)
> if (IS_GEN5(dev))
> dpfc_ctl |= obj->fence_reg;
>
> + if (dev_priv->fbc.false_color)
> + dpfc_ctl |= FBC_CTL_FALSE_COLOR;
> +
> I915_WRITE(ILK_DPFC_FENCE_YOFF, crtc->y);
> I915_WRITE(ILK_FBC_RT_BASE, i915_gem_obj_ggtt_offset(obj) | ILK_FBC_RT_VALID);
> /* enable it... */
> @@ -290,6 +293,9 @@ static void gen7_enable_fbc(struct drm_crtc *crtc)
> dpfc_ctl |= DPFC_CTL_LIMIT_1X;
> dpfc_ctl |= IVB_DPFC_CTL_FENCE_EN;
>
> + if (dev_priv->fbc.false_color)
> + dpfc_ctl |= FBC_CTL_FALSE_COLOR;
> +
> I915_WRITE(ILK_DPFC_CONTROL, dpfc_ctl | DPFC_CTL_EN);
>
> if (IS_IVYBRIDGE(dev)) {
> --
> 1.9.0
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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