DRM: Add DRM KMS/FB CMA helper (2e3b3c42) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/gpu/drm/Kconfig

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		@@ -60,6 +60,15 @@ config DRM_GEM_CMA_HELPER
		help
		Choose this if you need the GEM CMA helper functions

		config DRM_KMS_CMA_HELPER
		bool
		select DRM_GEM_CMA_HELPER
		select FB_SYS_FILLRECT
		select FB_SYS_COPYAREA
		select FB_SYS_IMAGEBLIT
		help
		Choose this if you need the KMS CMA helper functions

		config DRM_TDFX
		tristate "3dfx Banshee/Voodoo3+"
		depends on DRM && PCI

drivers/gpu/drm/Makefile

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		@@ -21,6 +21,7 @@ drm-usb-y := drm_usb.o

		drm_kms_helper-y := drm_fb_helper.o drm_crtc_helper.o drm_dp_i2c_helper.o
		drm_kms_helper-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
		drm_kms_helper-$(CONFIG_DRM_KMS_CMA_HELPER) += drm_fb_cma_helper.o

		obj-$(CONFIG_DRM_KMS_HELPER) += drm_kms_helper.o

drivers/gpu/drm/drm_fb_cma_helper.c

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		/*
		* drm kms/fb cma (contiguous memory allocator) helper functions
		*
		* Copyright (C) 2012 Analog Device Inc.
		* Author: Lars-Peter Clausen <lars@metafoo.de>
		*
		* Based on udl_fbdev.c
		* Copyright (C) 2012 Red Hat
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License
		* as published by the Free Software Foundation; either version 2
		* of the License, or (at your option) any later version.
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*/

		#include <drm/drmP.h>
		#include <drm/drm_crtc.h>
		#include <drm/drm_fb_helper.h>
		#include <drm/drm_crtc_helper.h>
		#include <drm/drm_gem_cma_helper.h>
		#include <drm/drm_fb_cma_helper.h>
		#include <linux/module.h>

		struct drm_fb_cma {
		struct drm_framebuffer fb;
		struct drm_gem_cma_object *obj[4];
		};

		struct drm_fbdev_cma {
		struct drm_fb_helper fb_helper;
		struct drm_fb_cma *fb;
		};

		static inline struct drm_fbdev_cma to_fbdev_cma(struct drm_fb_helper helper)
		{
		return container_of(helper, struct drm_fbdev_cma, fb_helper);
		}

		static inline struct drm_fb_cma to_fb_cma(struct drm_framebuffer fb)
		{
		return container_of(fb, struct drm_fb_cma, fb);
		}

		static void drm_fb_cma_destroy(struct drm_framebuffer *fb)
		{
		struct drm_fb_cma *fb_cma = to_fb_cma(fb);
		int i;

		for (i = 0; i < 4; i++) {
		if (fb_cma->obj[i])
		drm_gem_object_unreference_unlocked(&fb_cma->obj[i]->base);
		}

		drm_framebuffer_cleanup(fb);
		kfree(fb_cma);
		}

		static int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
		struct drm_file file_priv, unsigned int handle)
		{
		struct drm_fb_cma *fb_cma = to_fb_cma(fb);

		return drm_gem_handle_create(file_priv,
		&fb_cma->obj[0]->base, handle);
		}

		static struct drm_framebuffer_funcs drm_fb_cma_funcs = {
		.destroy = drm_fb_cma_destroy,
		.create_handle = drm_fb_cma_create_handle,
		};

		static struct drm_fb_cma drm_fb_cma_alloc(struct drm_device dev,
		struct drm_mode_fb_cmd2 mode_cmd, struct drm_gem_cma_object *obj,
		unsigned int num_planes)
		{
		struct drm_fb_cma *fb_cma;
		int ret;
		int i;

		fb_cma = kzalloc(sizeof(*fb_cma), GFP_KERNEL);
		if (!fb_cma)
		return ERR_PTR(-ENOMEM);

		ret = drm_framebuffer_init(dev, &fb_cma->fb, &drm_fb_cma_funcs);
		if (ret) {
		dev_err(dev->dev, "Failed to initalize framebuffer: %d\n", ret);
		kfree(fb_cma);
		return ERR_PTR(ret);
		}

		drm_helper_mode_fill_fb_struct(&fb_cma->fb, mode_cmd);

		for (i = 0; i < num_planes; i++)
		fb_cma->obj[i] = obj[i];

		return fb_cma;
		}

		/**
		* drm_fb_cma_create() - (struct drm_mode_config_funcs *)->fb_create callback function
		*
		* If your hardware has special alignment or pitch requirements these should be
		* checked before calling this function.
		*/
		struct drm_framebuffer drm_fb_cma_create(struct drm_device dev,
		struct drm_file file_priv, struct drm_mode_fb_cmd2 mode_cmd)
		{
		struct drm_fb_cma *fb_cma;
		struct drm_gem_cma_object *objs[4];
		struct drm_gem_object *obj;
		unsigned int hsub;
		unsigned int vsub;
		int ret;
		int i;

		hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
		vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);

		for (i = 0; i < drm_format_num_planes(mode_cmd->pixel_format); i++) {
		unsigned int width = mode_cmd->width / (i ? hsub : 1);
		unsigned int height = mode_cmd->height / (i ? vsub : 1);
		unsigned int min_size;

		obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[i]);
		if (!obj) {
		dev_err(dev->dev, "Failed to lookup GEM object\n");
		ret = -ENXIO;
		goto err_gem_object_unreference;
		}

		min_size = (height - 1) * mode_cmd->pitches[i]
		+ width * drm_format_plane_cpp(mode_cmd->pixel_format, i)
		+ mode_cmd->offsets[i];

		if (obj->size < min_size) {
		drm_gem_object_unreference_unlocked(obj);
		ret = -EINVAL;
		goto err_gem_object_unreference;
		}
		objs[i] = to_drm_gem_cma_obj(obj);
		}

		fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i);
		if (IS_ERR(fb_cma)) {
		ret = PTR_ERR(fb_cma);
		goto err_gem_object_unreference;
		}

		return &fb_cma->fb;

		err_gem_object_unreference:
		for (i--; i >= 0; i--)
		drm_gem_object_unreference_unlocked(&objs[i]->base);
		return ERR_PTR(ret);
		}
		EXPORT_SYMBOL_GPL(drm_fb_cma_create);

		/**
		* drm_fb_cma_get_gem_obj() - Get CMA GEM object for framebuffer
		* @fb: The framebuffer
		* @plane: Which plane
		*
		* Return the CMA GEM object for given framebuffer.
		*
		* This function will usually be called from the CRTC callback functions.
		*/
		struct drm_gem_cma_object drm_fb_cma_get_gem_obj(struct drm_framebuffer fb,
		unsigned int plane)
		{
		struct drm_fb_cma *fb_cma = to_fb_cma(fb);

		if (plane >= 4)
		return NULL;

		return fb_cma->obj[plane];
		}
		EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);

		static struct fb_ops drm_fbdev_cma_ops = {
		.owner = THIS_MODULE,
		.fb_fillrect = sys_fillrect,
		.fb_copyarea = sys_copyarea,
		.fb_imageblit = sys_imageblit,
		.fb_check_var = drm_fb_helper_check_var,
		.fb_set_par = drm_fb_helper_set_par,
		.fb_blank = drm_fb_helper_blank,
		.fb_pan_display = drm_fb_helper_pan_display,
		.fb_setcmap = drm_fb_helper_setcmap,
		};

		static int drm_fbdev_cma_create(struct drm_fb_helper *helper,
		struct drm_fb_helper_surface_size *sizes)
		{
		struct drm_fbdev_cma *fbdev_cma = to_fbdev_cma(helper);
		struct drm_mode_fb_cmd2 mode_cmd = { 0 };
		struct drm_device *dev = helper->dev;
		struct drm_gem_cma_object *obj;
		struct drm_framebuffer *fb;
		unsigned int bytes_per_pixel;
		unsigned long offset;
		struct fb_info *fbi;
		size_t size;
		int ret;

		DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
		sizes->surface_width, sizes->surface_height,
		sizes->surface_bpp);

		bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);

		mode_cmd.width = sizes->surface_width;
		mode_cmd.height = sizes->surface_height;
		mode_cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
		mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
		sizes->surface_depth);

		size = mode_cmd.pitches[0] * mode_cmd.height;
		obj = drm_gem_cma_create(dev, size);
		if (!obj)
		return -ENOMEM;

		fbi = framebuffer_alloc(0, dev->dev);
		if (!fbi) {
		dev_err(dev->dev, "Failed to allocate framebuffer info.\n");
		ret = -ENOMEM;
		goto err_drm_gem_cma_free_object;
		}

		fbdev_cma->fb = drm_fb_cma_alloc(dev, &mode_cmd, &obj, 1);
		if (IS_ERR(fbdev_cma->fb)) {
		dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
		ret = PTR_ERR(fbdev_cma->fb);
		goto err_framebuffer_release;
		}

		fb = &fbdev_cma->fb->fb;
		helper->fb = fb;
		helper->fbdev = fbi;

		fbi->par = helper;
		fbi->flags = FBINFO_FLAG_DEFAULT;
		fbi->fbops = &drm_fbdev_cma_ops;

		ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
		if (ret) {
		dev_err(dev->dev, "Failed to allocate color map.\n");
		goto err_drm_fb_cma_destroy;
		}

		drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
		drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);

		offset = fbi->var.xoffset * bytes_per_pixel;
		offset += fbi->var.yoffset * fb->pitches[0];

		dev->mode_config.fb_base = (resource_size_t)obj->paddr;
		fbi->screen_base = obj->vaddr + offset;
		fbi->fix.smem_start = (unsigned long)(obj->paddr + offset);
		fbi->screen_size = size;
		fbi->fix.smem_len = size;

		return 0;

		err_drm_fb_cma_destroy:
		drm_fb_cma_destroy(fb);
		err_framebuffer_release:
		framebuffer_release(fbi);
		err_drm_gem_cma_free_object:
		drm_gem_cma_free_object(&obj->base);
		return ret;
		}

		static int drm_fbdev_cma_probe(struct drm_fb_helper *helper,
		struct drm_fb_helper_surface_size *sizes)
		{
		int ret = 0;

		if (!helper->fb) {
		ret = drm_fbdev_cma_create(helper, sizes);
		if (ret < 0)
		return ret;
		ret = 1;
		}

		return ret;
		}

		static struct drm_fb_helper_funcs drm_fb_cma_helper_funcs = {
		.fb_probe = drm_fbdev_cma_probe,
		};

		/**
		* drm_fbdev_cma_init() - Allocate and initializes a drm_fbdev_cma struct
		* @dev: DRM device
		* @preferred_bpp: Preferred bits per pixel for the device
		* @num_crtc: Number of CRTCs
		* @max_conn_count: Maximum number of connectors
		*
		* Returns a newly allocated drm_fbdev_cma struct or a ERR_PTR.
		*/
		struct drm_fbdev_cma drm_fbdev_cma_init(struct drm_device dev,
		unsigned int preferred_bpp, unsigned int num_crtc,
		unsigned int max_conn_count)
		{
		struct drm_fbdev_cma *fbdev_cma;
		struct drm_fb_helper *helper;
		int ret;

		fbdev_cma = kzalloc(sizeof(*fbdev_cma), GFP_KERNEL);
		if (!fbdev_cma) {
		dev_err(dev->dev, "Failed to allocate drm fbdev.\n");
		return ERR_PTR(-ENOMEM);
		}

		fbdev_cma->fb_helper.funcs = &drm_fb_cma_helper_funcs;
		helper = &fbdev_cma->fb_helper;

		ret = drm_fb_helper_init(dev, helper, num_crtc, max_conn_count);
		if (ret < 0) {
		dev_err(dev->dev, "Failed to initialize drm fb helper.\n");
		goto err_free;
		}

		ret = drm_fb_helper_single_add_all_connectors(helper);
		if (ret < 0) {
		dev_err(dev->dev, "Failed to add connectors.\n");
		goto err_drm_fb_helper_fini;

		}

		ret = drm_fb_helper_initial_config(helper, preferred_bpp);
		if (ret < 0) {
		dev_err(dev->dev, "Failed to set inital hw configuration.\n");
		goto err_drm_fb_helper_fini;
		}

		return fbdev_cma;

		err_drm_fb_helper_fini:
		drm_fb_helper_fini(helper);
		err_free:
		kfree(fbdev_cma);

		return ERR_PTR(ret);
		}
		EXPORT_SYMBOL_GPL(drm_fbdev_cma_init);

		/**
		* drm_fbdev_cma_fini() - Free drm_fbdev_cma struct
		* @fbdev_cma: The drm_fbdev_cma struct
		*/
		void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma)
		{
		if (fbdev_cma->fb_helper.fbdev) {
		struct fb_info *info;
		int ret;

		info = fbdev_cma->fb_helper.fbdev;
		ret = unregister_framebuffer(info);
		if (ret < 0)
		DRM_DEBUG_KMS("failed unregister_framebuffer()\n");

		if (info->cmap.len)
		fb_dealloc_cmap(&info->cmap);

		framebuffer_release(info);
		}

		if (fbdev_cma->fb)
		drm_fb_cma_destroy(&fbdev_cma->fb->fb);

		drm_fb_helper_fini(&fbdev_cma->fb_helper);
		kfree(fbdev_cma);
		}
		EXPORT_SYMBOL_GPL(drm_fbdev_cma_fini);

		/**
		* drm_fbdev_cma_restore_mode() - Restores initial framebuffer mode
		* @fbdev_cma: The drm_fbdev_cma struct, may be NULL
		*
		* This function is usually called from the DRM drivers lastclose callback.
		*/
		void drm_fbdev_cma_restore_mode(struct drm_fbdev_cma *fbdev_cma)
		{
		if (fbdev_cma)
		drm_fb_helper_restore_fbdev_mode(&fbdev_cma->fb_helper);
		}
		EXPORT_SYMBOL_GPL(drm_fbdev_cma_restore_mode);

		/**
		* drm_fbdev_cma_hotplug_event() - Poll for hotpulug events
		* @fbdev_cma: The drm_fbdev_cma struct, may be NULL
		*
		* This function is usually called from the DRM drivers output_poll_changed
		* callback.
		*/
		void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev_cma)
		{
		if (fbdev_cma)
		drm_fb_helper_hotplug_event(&fbdev_cma->fb_helper);
		}
		EXPORT_SYMBOL_GPL(drm_fbdev_cma_hotplug_event);

include/drm/drm_fb_cma_helper.h

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		#ifndef __DRM_FB_CMA_HELPER_H__
		#define __DRM_FB_CMA_HELPER_H__

		struct drm_fbdev_cma;
		struct drm_gem_cma_object;

		struct drm_framebuffer;
		struct drm_device;
		struct drm_file;
		struct drm_mode_fb_cmd2;

		struct drm_fbdev_cma drm_fbdev_cma_init(struct drm_device dev,
		unsigned int preferred_bpp, unsigned int num_crtc,
		unsigned int max_conn_count);
		void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma);

		void drm_fbdev_cma_restore_mode(struct drm_fbdev_cma *fbdev_cma);
		void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev_cma);

		struct drm_framebuffer drm_fb_cma_create(struct drm_device dev,
		struct drm_file file_priv, struct drm_mode_fb_cmd2 mode_cmd);

		struct drm_gem_cma_object drm_fb_cma_get_gem_obj(struct drm_framebuffer fb,
		unsigned int plane);

		#endif