[PATCH v2] DRM: Add DRM kms/fb cma helper
Lars-Peter Clausen
lars at metafoo.de
Wed May 30 08:30:15 PDT 2012
This patch introduces a set of helper function for implementing the KMS
framebuffer layer for drivers which use the drm gem CMA helper function.
Signed-off-by: Lars-Peter Clausen <lars at metafoo.de>
---
Changes since v1:
* Some spelling fixes
* Add missing kfree in drm_fb_cma_alloc error path
* Add multi-plane support. drm_fb_cma_get_gem_obj now takes a second
parameter to specify the plane.
---
drivers/gpu/drm/Kconfig | 11 +
drivers/gpu/drm/Makefile | 1 +
drivers/gpu/drm/drm_fb_cma_helper.c | 384 +++++++++++++++++++++++++++++++++++
include/drm/drm_fb_cma_helper.h | 27 +++
4 files changed, 423 insertions(+)
create mode 100644 drivers/gpu/drm/drm_fb_cma_helper.c
create mode 100644 include/drm/drm_fb_cma_helper.h
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index a78dfbe..e7c0a3d 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -41,6 +41,17 @@ config DRM_GEM_CMA_HELPER
help
Choose this if you need the GEM cma helper functions
+config DRM_KMS_CMA_HELPER
+ tristate
+ select DRM_GEM_CMA_HELPER
+ select DRM_KMS_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
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 6e9e948..5dcb1a5 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -18,6 +18,7 @@ drm-$(CONFIG_COMPAT) += drm_ioc32.o
drm-$(CONFIG_DRM_GEM_CMA_HELPER) += drm_gem_cma_helper.o
drm_kms_helper-y := drm_fb_helper.o drm_crtc_helper.o drm_dp_i2c_helper.o
+drm_kms_helper-$(CONFIG_DRM_KMS_CMA_HELPER) += drm_fb_cma_helper.o
obj-$(CONFIG_DRM_KMS_HELPER) += drm_kms_helper.o
diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c b/drivers/gpu/drm/drm_fb_cma_helper.c
new file mode 100644
index 0000000..8821a98
--- /dev/null
+++ b/drivers/gpu/drm/drm_fb_cma_helper.c
@@ -0,0 +1,384 @@
+/*
+ * drm kms/fb cma (contiguous memory allocator) helper functions
+ *
+ * Copyright (C) 2012 Analog Device Inc.
+ * Author: Lars-Peter Clausen <lars at 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_obj *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_obj **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
+ */
+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_obj *objs[4];
+ struct drm_gem_object *obj;
+ int ret;
+ int i;
+
+ for (i = 0; i < drm_format_num_planes(mode_cmd->pixel_format); i++) {
+ 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;
+ }
+ 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_obj *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_obj *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);
diff --git a/include/drm/drm_fb_cma_helper.h b/include/drm/drm_fb_cma_helper.h
new file mode 100644
index 0000000..7317beb
--- /dev/null
+++ b/include/drm/drm_fb_cma_helper.h
@@ -0,0 +1,27 @@
+#ifndef __DRM_FB_CMA_HELPER_H__
+#define __DRM_FB_CMA_HELPER_H__
+
+struct drm_fbdev_cma;
+struct drm_gem_cma_obj;
+
+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_obj *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
+ unsigned int plane);
+
+#endif
+
--
1.7.10
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