cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/tinydrm/core/tinydrm-core.c

/*
 * Copyright (C) 2016 Noralf Trønnes
 *
 * 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.
 */

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/tinydrm/tinydrm.h>
#include <linux/device.h>
#include <linux/dma-buf.h>

/**
 * DOC: overview
 *
 * This library provides driver helpers for very simple display hardware.
 *
 * It is based on &drm_simple_display_pipe coupled with a &drm_connector which
 * has only one fixed &drm_display_mode. The framebuffers are backed by the
 * cma helper and have support for framebuffer flushing (dirty).
 * fbdev support is also included.
 *
 */

/**
 * DOC: core
 *
 * The driver allocates &tinydrm_device, initializes it using
 * devm_tinydrm_init(), sets up the pipeline using tinydrm_display_pipe_init()
 * and registers the DRM device using devm_tinydrm_register().
 */

/**
 * tinydrm_lastclose - DRM lastclose helper
 * @drm: DRM device
 *
 * This function ensures that fbdev is restored when drm_lastclose() is called
 * on the last drm_release(). Drivers can use this as their
 * &drm_driver->lastclose callback.
 */

void tinydrm_lastclose(struct drm_device *drm) { struct tinydrm_device *tdev = drm->dev_private; DRM_DEBUG_KMS("\n"); drm_fbdev_cma_restore_mode(tdev->fbdev_cma); }

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EXPORT_SYMBOL(tinydrm_lastclose); /** * tinydrm_gem_cma_prime_import_sg_table - Produce a CMA GEM object from * another driver's scatter/gather table of pinned pages * @drm: DRM device to import into * @attach: DMA-BUF attachment * @sgt: Scatter/gather table of pinned pages * * This function imports a scatter/gather table exported via DMA-BUF by * another driver using drm_gem_cma_prime_import_sg_table(). It sets the * kernel virtual address on the CMA object. Drivers should use this as their * &drm_driver->gem_prime_import_sg_table callback if they need the virtual * address. tinydrm_gem_cma_free_object() should be used in combination with * this function. * * Returns: * A pointer to a newly created GEM object or an ERR_PTR-encoded negative * error code on failure. */
struct drm_gem_object * tinydrm_gem_cma_prime_import_sg_table(struct drm_device *drm, struct dma_buf_attachment *attach, struct sg_table *sgt) { struct drm_gem_cma_object *cma_obj; struct drm_gem_object *obj; void *vaddr; vaddr = dma_buf_vmap(attach->dmabuf); if (!vaddr) { DRM_ERROR("Failed to vmap PRIME buffer\n"); return ERR_PTR(-ENOMEM); } obj = drm_gem_cma_prime_import_sg_table(drm, attach, sgt); if (IS_ERR(obj)) { dma_buf_vunmap(attach->dmabuf, vaddr); return obj; } cma_obj = to_drm_gem_cma_obj(obj); cma_obj->vaddr = vaddr; return obj; }

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EXPORT_SYMBOL(tinydrm_gem_cma_prime_import_sg_table); /** * tinydrm_gem_cma_free_object - Free resources associated with a CMA GEM * object * @gem_obj: GEM object to free * * This function frees the backing memory of the CMA GEM object, cleans up the * GEM object state and frees the memory used to store the object itself using * drm_gem_cma_free_object(). It also handles PRIME buffers which has the kernel * virtual address set by tinydrm_gem_cma_prime_import_sg_table(). Drivers * can use this as their &drm_driver->gem_free_object callback. */
void tinydrm_gem_cma_free_object(struct drm_gem_object *gem_obj) { if (gem_obj->import_attach) { struct drm_gem_cma_object *cma_obj; cma_obj = to_drm_gem_cma_obj(gem_obj); dma_buf_vunmap(gem_obj->import_attach->dmabuf, cma_obj->vaddr); cma_obj->vaddr = NULL; } drm_gem_cma_free_object(gem_obj); }

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EXPORT_SYMBOL_GPL(tinydrm_gem_cma_free_object); const struct file_operations tinydrm_fops = { .owner = THIS_MODULE, .open = drm_open, .release = drm_release, .unlocked_ioctl = drm_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = drm_compat_ioctl, #endif .poll = drm_poll, .read = drm_read, .llseek = no_llseek, .mmap = drm_gem_cma_mmap, }; EXPORT_SYMBOL(tinydrm_fops);
static struct drm_framebuffer * tinydrm_fb_create(struct drm_device *drm, struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd) { struct tinydrm_device *tdev = drm->dev_private; return drm_fb_cma_create_with_funcs(drm, file_priv, mode_cmd, tdev->fb_funcs); }

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static const struct drm_mode_config_funcs tinydrm_mode_config_funcs = { .fb_create = tinydrm_fb_create, .atomic_check = drm_atomic_helper_check, .atomic_commit = drm_atomic_helper_commit, };
static int tinydrm_init(struct device *parent, struct tinydrm_device *tdev, const struct drm_framebuffer_funcs *fb_funcs, struct drm_driver *driver) { struct drm_device *drm; mutex_init(&tdev->dirty_lock); tdev->fb_funcs = fb_funcs; /* * We don't embed drm_device, because that prevent us from using * devm_kzalloc() to allocate tinydrm_device in the driver since * drm_dev_unref() frees the structure. The devm_ functions provide * for easy error handling. */ drm = drm_dev_alloc(driver, parent); if (IS_ERR(drm)) return PTR_ERR(drm); tdev->drm = drm; drm->dev_private = tdev; drm_mode_config_init(drm); drm->mode_config.funcs = &tinydrm_mode_config_funcs; return 0; }

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static void tinydrm_fini(struct tinydrm_device *tdev) { drm_mode_config_cleanup(tdev->drm); mutex_destroy(&tdev->dirty_lock); tdev->drm->dev_private = NULL; drm_dev_unref(tdev->drm); }

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static void devm_tinydrm_release(void *data) { tinydrm_fini(data); }

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/** * devm_tinydrm_init - Initialize tinydrm device * @parent: Parent device object * @tdev: tinydrm device * @fb_funcs: Framebuffer functions * @driver: DRM driver * * This function initializes @tdev, the underlying DRM device and it's * mode_config. Resources will be automatically freed on driver detach (devres) * using drm_mode_config_cleanup() and drm_dev_unref(). * * Returns: * Zero on success, negative error code on failure. */
int devm_tinydrm_init(struct device *parent, struct tinydrm_device *tdev, const struct drm_framebuffer_funcs *fb_funcs, struct drm_driver *driver) { int ret; ret = tinydrm_init(parent, tdev, fb_funcs, driver); if (ret) return ret; ret = devm_add_action(parent, devm_tinydrm_release, tdev); if (ret) tinydrm_fini(tdev); return ret; }

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EXPORT_SYMBOL(devm_tinydrm_init);
static int tinydrm_register(struct tinydrm_device *tdev) { struct drm_device *drm = tdev->drm; int bpp = drm->mode_config.preferred_depth; struct drm_fbdev_cma *fbdev; int ret; ret = drm_dev_register(tdev->drm, 0); if (ret) return ret; fbdev = drm_fbdev_cma_init_with_funcs(drm, bpp ? bpp : 32, drm->mode_config.num_connector, tdev->fb_funcs); if (IS_ERR(fbdev)) DRM_ERROR("Failed to initialize fbdev: %ld\n", PTR_ERR(fbdev)); else tdev->fbdev_cma = fbdev; return 0; }

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static void tinydrm_unregister(struct tinydrm_device *tdev) { struct drm_fbdev_cma *fbdev_cma = tdev->fbdev_cma; drm_crtc_force_disable_all(tdev->drm); /* don't restore fbdev in lastclose, keep pipeline disabled */ tdev->fbdev_cma = NULL; drm_dev_unregister(tdev->drm); if (fbdev_cma) drm_fbdev_cma_fini(fbdev_cma); }

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static void devm_tinydrm_register_release(void *data) { tinydrm_unregister(data); }

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/** * devm_tinydrm_register - Register tinydrm device * @tdev: tinydrm device * * This function registers the underlying DRM device and fbdev. * These resources will be automatically unregistered on driver detach (devres) * and the display pipeline will be disabled. * * Returns: * Zero on success, negative error code on failure. */
int devm_tinydrm_register(struct tinydrm_device *tdev) { struct device *dev = tdev->drm->dev; int ret; ret = tinydrm_register(tdev); if (ret) return ret; ret = devm_add_action(dev, devm_tinydrm_register_release, tdev); if (ret) tinydrm_unregister(tdev); return ret; }

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EXPORT_SYMBOL(devm_tinydrm_register); /** * tinydrm_shutdown - Shutdown tinydrm * @tdev: tinydrm device * * This function makes sure that the display pipeline is disabled. * Used by drivers in their shutdown callback to turn off the display * on machine shutdown and reboot. */
void tinydrm_shutdown(struct tinydrm_device *tdev) { drm_crtc_force_disable_all(tdev->drm); }

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EXPORT_SYMBOL(tinydrm_shutdown); /** * tinydrm_suspend - Suspend tinydrm * @tdev: tinydrm device * * Used in driver PM operations to suspend tinydrm. * Suspends fbdev and DRM. * Resume with tinydrm_resume(). * * Returns: * Zero on success, negative error code on failure. */
int tinydrm_suspend(struct tinydrm_device *tdev) { struct drm_atomic_state *state; if (tdev->suspend_state) { DRM_ERROR("Failed to suspend: state already set\n"); return -EINVAL; } drm_fbdev_cma_set_suspend_unlocked(tdev->fbdev_cma, 1); state = drm_atomic_helper_suspend(tdev->drm); if (IS_ERR(state)) { drm_fbdev_cma_set_suspend_unlocked(tdev->fbdev_cma, 0); return PTR_ERR(state); } tdev->suspend_state = state; return 0; }

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EXPORT_SYMBOL(tinydrm_suspend); /** * tinydrm_resume - Resume tinydrm * @tdev: tinydrm device * * Used in driver PM operations to resume tinydrm. * Suspend with tinydrm_suspend(). * * Returns: * Zero on success, negative error code on failure. */
int tinydrm_resume(struct tinydrm_device *tdev) { struct drm_atomic_state *state = tdev->suspend_state; int ret; if (!state) { DRM_ERROR("Failed to resume: state is not set\n"); return -EINVAL; } tdev->suspend_state = NULL; ret = drm_atomic_helper_resume(tdev->drm, state); if (ret) { DRM_ERROR("Error resuming state: %d\n", ret); return ret; } drm_fbdev_cma_set_suspend_unlocked(tdev->fbdev_cma, 0); return 0; }

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EXPORT_SYMBOL(tinydrm_resume); MODULE_LICENSE("GPL");

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