Re: [PATCH v3 6/9] drm/komeda: Add komeda_framebuffer

[Liviu Dudau <Liviu.Dudau@arm.com>]

On Fri, Dec 21, 2018 at 10:00:17AM +0000, james qian wang (Arm Technology China) wrote:
> komeda_framebuffer is for extending drm_framebuffer to add komeda own
> attributes and komeda specific fb handling.
> 
> Changes in v3:
> - Fixed style problem found by checkpatch.pl --strict.
> 
> Signed-off-by: James (Qian) Wang <james.qian.wang@arm.com>
> ---
>  drivers/gpu/drm/arm/display/komeda/Makefile   |   3 +-
>  .../arm/display/komeda/komeda_framebuffer.c   | 165 ++++++++++++++++++
>  .../arm/display/komeda/komeda_framebuffer.h   |  31 ++++
>  3 files changed, 198 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
>  create mode 100644 drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.h
> 
> diff --git a/drivers/gpu/drm/arm/display/komeda/Makefile b/drivers/gpu/drm/arm/display/komeda/Makefile
> index 394fc2aa434a..25beae900ed2 100644
> --- a/drivers/gpu/drm/arm/display/komeda/Makefile
> +++ b/drivers/gpu/drm/arm/display/komeda/Makefile
> @@ -8,7 +8,8 @@ komeda-y := \
>  	komeda_drv.o \
>  	komeda_dev.o \
>  	komeda_format_caps.o \
> -	komeda_pipeline.o
> +	komeda_pipeline.o \
> +	komeda_framebuffer.o
>  
>  komeda-y += \
>  	d71/d71_dev.o
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> new file mode 100644
> index 000000000000..4ddd5314ca23
> --- /dev/null
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
> @@ -0,0 +1,165 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
> + * Author: James.Qian.Wang <james.qian.wang@arm.com>
> + *
> + */
> +#include <drm/drm_gem.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
> +#include <drm/drm_fb_cma_helper.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include "komeda_framebuffer.h"
> +#include "komeda_dev.h"
> +
> +static void komeda_fb_destroy(struct drm_framebuffer *fb)
> +{
> +	struct komeda_fb *kfb = to_kfb(fb);
> +	u32 i;
> +
> +	for (i = 0; i < fb->format->num_planes; i++)
> +		drm_gem_object_put_unlocked(fb->obj[i]);
> +
> +	drm_framebuffer_cleanup(fb);
> +	kfree(kfb);
> +}
> +
> +static int komeda_fb_create_handle(struct drm_framebuffer *fb,
> +				   struct drm_file *file, u32 *handle)
> +{
> +	return drm_gem_handle_create(file, fb->obj[0], handle);
> +}
> +
> +static const struct drm_framebuffer_funcs komeda_fb_funcs = {
> +	.destroy	= komeda_fb_destroy,
> +	.create_handle	= komeda_fb_create_handle,
> +};
> +
> +static int
> +komeda_fb_none_afbc_size_check(struct komeda_dev *mdev, struct komeda_fb *kfb,
> +			       struct drm_file *file,
> +			       const struct drm_mode_fb_cmd2 *mode_cmd)

Not sure what _none stands for here, but otherwise:

Acked-by: Liviu Dudau <liviu.dudau@arm.com>

Best regards,
Liviu

> +{
> +	struct drm_framebuffer *fb = &kfb->base;
> +	struct drm_gem_object *obj;
> +	u32 min_size = 0;
> +	u32 i;
> +
> +	for (i = 0; i < fb->format->num_planes; i++) {
> +		obj = drm_gem_object_lookup(file, mode_cmd->handles[i]);
> +		if (!obj) {
> +			DRM_DEBUG_KMS("Failed to lookup GEM object\n");
> +			fb->obj[i] = NULL;
> +
> +			return -ENOENT;
> +		}
> +
> +		kfb->aligned_w = fb->width / (i ? fb->format->hsub : 1);
> +		kfb->aligned_h = fb->height / (i ? fb->format->vsub : 1);
> +
> +		if (fb->pitches[i] % mdev->chip.bus_width) {
> +			DRM_DEBUG_KMS("Pitch[%d]: 0x%x doesn't align to 0x%x\n",
> +				      i, fb->pitches[i], mdev->chip.bus_width);
> +			drm_gem_object_put_unlocked(obj);
> +			fb->obj[i] = NULL;
> +
> +			return -EINVAL;
> +		}
> +
> +		min_size = ((kfb->aligned_h / kfb->format_caps->tile_size - 1)
> +			    * fb->pitches[i])
> +			    + (kfb->aligned_w * fb->format->cpp[i]
> +			       * kfb->format_caps->tile_size)
> +			    + fb->offsets[i];
> +
> +		if (obj->size < min_size) {
> +			DRM_DEBUG_KMS("Fail to check none afbc fb size.\n");
> +			drm_gem_object_put_unlocked(obj);
> +			fb->obj[i] = NULL;
> +
> +			return -EINVAL;
> +		}
> +
> +		fb->obj[i] = obj;
> +	}
> +
> +	if (fb->format->num_planes == 3) {
> +		if (fb->pitches[1] != fb->pitches[2]) {
> +			DRM_DEBUG_KMS("The pitch[1] and [2] are not same\n");
> +			return -EINVAL;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +struct drm_framebuffer *
> +komeda_fb_create(struct drm_device *dev, struct drm_file *file,
> +		 const struct drm_mode_fb_cmd2 *mode_cmd)
> +{
> +	struct komeda_dev *mdev = dev->dev_private;
> +	struct komeda_fb *kfb;
> +	int ret = 0, i;
> +
> +	kfb = kzalloc(sizeof(*kfb), GFP_KERNEL);
> +	if (!kfb)
> +		return ERR_PTR(-ENOMEM);
> +
> +	kfb->format_caps = komeda_get_format_caps(&mdev->fmt_tbl,
> +						  mode_cmd->pixel_format,
> +						  mode_cmd->modifier[0]);
> +	if (!kfb->format_caps) {
> +		DRM_DEBUG_KMS("FMT %x is not supported.\n",
> +			      mode_cmd->pixel_format);
> +		kfree(kfb);
> +		return ERR_PTR(-EINVAL);
> +	}
> +
> +	drm_helper_mode_fill_fb_struct(dev, &kfb->base, mode_cmd);
> +
> +	ret = komeda_fb_none_afbc_size_check(mdev, kfb, file, mode_cmd);
> +	if (ret < 0)
> +		goto err_cleanup;
> +
> +	ret = drm_framebuffer_init(dev, &kfb->base, &komeda_fb_funcs);
> +	if (ret < 0) {
> +		DRM_DEBUG_KMS("failed to initialize fb\n");
> +
> +		goto err_cleanup;
> +	}
> +
> +	return &kfb->base;
> +
> +err_cleanup:
> +	for (i = 0; i < kfb->base.format->num_planes; i++)
> +		drm_gem_object_put_unlocked(kfb->base.obj[i]);
> +
> +	kfree(kfb);
> +	return ERR_PTR(ret);
> +}
> +
> +dma_addr_t
> +komeda_fb_get_pixel_addr(struct komeda_fb *kfb, int x, int y, int plane)
> +{
> +	struct drm_framebuffer *fb = &kfb->base;
> +	const struct drm_gem_cma_object *obj;
> +	u32 plane_x, plane_y, cpp, pitch, offset;
> +
> +	if (plane > fb->format->num_planes) {
> +		DRM_DEBUG_KMS("Out of max plane num.\n");
> +		return -EINVAL;
> +	}
> +
> +	obj = drm_fb_cma_get_gem_obj(fb, plane);
> +
> +	offset = fb->offsets[plane];
> +	if (!fb->modifier) {
> +		plane_x = x / (plane ? fb->format->hsub : 1);
> +		plane_y = y / (plane ? fb->format->vsub : 1);
> +		cpp = fb->format->cpp[plane];
> +		pitch = fb->pitches[plane];
> +		offset += plane_x * cpp *  kfb->format_caps->tile_size +
> +				(plane_y * pitch) / kfb->format_caps->tile_size;
> +	}
> +
> +	return obj->paddr + offset;
> +}
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.h b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.h
> new file mode 100644
> index 000000000000..383780013bb9
> --- /dev/null
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.h
> @@ -0,0 +1,31 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
> + * Author: James.Qian.Wang <james.qian.wang@arm.com>
> + *
> + */
> +#ifndef _KOMEDA_FRAMEBUFFER_H_
> +#define _KOMEDA_FRAMEBUFFER_H_
> +
> +/** struct komeda_fb - entend drm_framebuffer with komeda attribute */
> +struct komeda_fb {
> +	/** @base: &drm_framebuffer */
> +	struct drm_framebuffer base;
> +	/* @format_caps: &komeda_format_caps */
> +	const struct komeda_format_caps *format_caps;
> +	/** @aligned_w: aligned frame buffer width */
> +	u32 aligned_w;
> +	/** @aligned_h: aligned frame buffer height */
> +	u32 aligned_h;
> +};
> +
> +#define to_kfb(dfb)	container_of(dfb, struct komeda_fb, base)
> +
> +struct drm_framebuffer *
> +komeda_fb_create(struct drm_device *dev, struct drm_file *file,
> +		 const struct drm_mode_fb_cmd2 *mode_cmd);
> +dma_addr_t
> +komeda_fb_get_pixel_addr(struct komeda_fb *kfb, int x, int y, int plane);
> +bool komeda_fb_is_layer_supported(struct komeda_fb *kfb, u32 layer_type);
> +
> +#endif
> -- 
> 2.17.1
> 

-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
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