The SimpleDRM driver binds to simple-framebuffer devices and provides a DRM/KMS API. It provides only a single CRTC+encoder+connector combination plus one initial mode.
Userspace can create one dumb-buffer and attach it to the CRTC. Only if the buffer is destroyed, a new buffer can be created. The buffer is directly mapped into user-space, so we have only resources for a single buffer. Otherwise, shadow buffers plus damage-request would be needed.
Signed-off-by: David Herrmann dh.herrmann@gmail.com --- MAINTAINERS | 8 + drivers/gpu/drm/Kconfig | 2 + drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/simpledrm/Kconfig | 18 ++ drivers/gpu/drm/simpledrm/Makefile | 5 + drivers/gpu/drm/simpledrm/simpledrm.h | 91 ++++++++ drivers/gpu/drm/simpledrm/simpledrm_drv.c | 230 ++++++++++++++++++++ drivers/gpu/drm/simpledrm/simpledrm_main.c | 330 +++++++++++++++++++++++++++++ drivers/gpu/drm/simpledrm/simpledrm_mem.c | 254 ++++++++++++++++++++++ 9 files changed, 939 insertions(+) create mode 100644 drivers/gpu/drm/simpledrm/Kconfig create mode 100644 drivers/gpu/drm/simpledrm/Makefile create mode 100644 drivers/gpu/drm/simpledrm/simpledrm.h create mode 100644 drivers/gpu/drm/simpledrm/simpledrm_drv.c create mode 100644 drivers/gpu/drm/simpledrm/simpledrm_main.c create mode 100644 drivers/gpu/drm/simpledrm/simpledrm_mem.c
diff --git a/MAINTAINERS b/MAINTAINERS index 5be702c..0f651845 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -7305,6 +7305,14 @@ S: Odd Fixes F: drivers/media/platform/sh_vou.c F: include/media/sh_vou.h
+SIMPLE DRM DRIVER +M: David Herrmann dh.herrmann@gmail.com +L: dri-devel@lists.freedesktop.org +T: git git://people.freedesktop.org/~dvdhrm/linux +S: Maintained +F: drivers/gpu/drm/simpledrm +F: include/linux/platform_data/simpledrm.h + SIMPLE FIRMWARE INTERFACE (SFI) M: Len Brown lenb@kernel.org L: sfi-devel@simplefirmware.org diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index b16c50e..b3ccef6 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -220,3 +220,5 @@ source "drivers/gpu/drm/omapdrm/Kconfig" source "drivers/gpu/drm/tilcdc/Kconfig"
source "drivers/gpu/drm/qxl/Kconfig" + +source "drivers/gpu/drm/simpledrm/Kconfig" diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index 1c9f2439..59c424d 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -52,4 +52,5 @@ obj-$(CONFIG_DRM_SHMOBILE) +=shmobile/ obj-$(CONFIG_DRM_OMAP) += omapdrm/ obj-$(CONFIG_DRM_TILCDC) += tilcdc/ obj-$(CONFIG_DRM_QXL) += qxl/ +obj-$(CONFIG_DRM_SIMPLEDRM) += simpledrm/ obj-y += i2c/ diff --git a/drivers/gpu/drm/simpledrm/Kconfig b/drivers/gpu/drm/simpledrm/Kconfig new file mode 100644 index 0000000..1d4f38e --- /dev/null +++ b/drivers/gpu/drm/simpledrm/Kconfig @@ -0,0 +1,18 @@ +config DRM_SIMPLEDRM + tristate "Simple firmware framebuffer DRM driver" + depends on DRM && !FB_SIMPLE + help + SimpleDRM can run on all systems with pre-initialized graphics + hardware. It uses a framebuffer that was initialized during + firmware boot. No page-flipping, modesetting or other advanced + features are available. However, other DRM drivers can be loaded + later and take over from SimpleDRM if they provide real hardware + support. + + SimpleDRM supports: "simple-framebuffer" DeviceTree objects, x86 VESA + BIOS Extensions (VBE), EFI framebuffers + + If unsure, say Y. + + To compile this driver as a module, choose M here: the + module will be called simpledrm. diff --git a/drivers/gpu/drm/simpledrm/Makefile b/drivers/gpu/drm/simpledrm/Makefile new file mode 100644 index 0000000..2d474a5 --- /dev/null +++ b/drivers/gpu/drm/simpledrm/Makefile @@ -0,0 +1,5 @@ +ccflags-y := -Iinclude/drm + +simpledrm-y := simpledrm_drv.o simpledrm_main.o simpledrm_mem.o + +obj-$(CONFIG_DRM_SIMPLEDRM) := simpledrm.o diff --git a/drivers/gpu/drm/simpledrm/simpledrm.h b/drivers/gpu/drm/simpledrm/simpledrm.h new file mode 100644 index 0000000..279d847 --- /dev/null +++ b/drivers/gpu/drm/simpledrm/simpledrm.h @@ -0,0 +1,91 @@ +/* + * SimpleDRM firmware framebuffer driver + * Copyright (c) 2012-2013 David Herrmann dh.herrmann@gmail.com + */ + +/* + * 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. + */ + +#ifndef SDRM_DRV_H +#define SDRM_DRV_H + +#include <linux/errno.h> +#include <linux/fb.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/platform_data/simplefb.h> +#include <linux/string.h> +#include <drm/drmP.h> + +struct sdrm_device; +struct sdrm_gem_object; +struct sdrm_framebuffer; + +/* simpledrm devices */ + +struct sdrm_device { + struct drm_device *ddev; + + /* framebuffer information */ + const struct simplefb_format *fb_sformat; + u32 fb_format; + u32 fb_width; + u32 fb_height; + u32 fb_stride; + u32 fb_bpp; + unsigned long fb_base; + unsigned long fb_size; + void *fb_map; + + /* mode-setting objects */ + struct sdrm_gem_object *fb_obj; + struct drm_crtc crtc; + struct drm_encoder enc; + struct drm_connector conn; + struct drm_display_mode *mode; +}; + +int sdrm_drm_load(struct drm_device *ddev, unsigned long flags); +int sdrm_drm_unload(struct drm_device *ddev); +int sdrm_drm_mmap(struct file *filp, struct vm_area_struct *vma); +int sdrm_pdev_init(struct sdrm_device *sdrm); +void sdrm_pdev_destroy(struct sdrm_device *sdrm); + +/* simpledrm gem objects */ + +struct sdrm_gem_object { + struct drm_gem_object base; + unsigned long fb_base; + unsigned long fb_size; +}; + +#define to_sdrm_bo(x) container_of(x, struct sdrm_gem_object, base) + +int sdrm_gem_init_object(struct drm_gem_object *obj); +void sdrm_gem_free_object(struct drm_gem_object *obj); +void sdrm_gem_unmap_object(struct sdrm_gem_object *obj); + +/* dumb buffers */ + +int sdrm_dumb_create(struct drm_file *file_priv, struct drm_device *ddev, + struct drm_mode_create_dumb *arg); +int sdrm_dumb_destroy(struct drm_file *file_priv, struct drm_device *ddev, + uint32_t handle); +int sdrm_dumb_map_offset(struct drm_file *file_priv, struct drm_device *ddev, + uint32_t handle, uint64_t *offset); + +/* simpledrm framebuffers */ + +struct sdrm_framebuffer { + struct drm_framebuffer base; + struct sdrm_gem_object *obj; +}; + +#define to_sdrm_fb(x) container_of(x, struct sdrm_framebuffer, base) + +#endif /* SDRM_DRV_H */ diff --git a/drivers/gpu/drm/simpledrm/simpledrm_drv.c b/drivers/gpu/drm/simpledrm/simpledrm_drv.c new file mode 100644 index 0000000..282752c --- /dev/null +++ b/drivers/gpu/drm/simpledrm/simpledrm_drv.c @@ -0,0 +1,230 @@ +/* + * SimpleDRM firmware framebuffer driver + * Copyright (c) 2012-2013 David Herrmann dh.herrmann@gmail.com + */ + +/* + * 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 <linux/errno.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/platform_data/simplefb.h> +#include <linux/string.h> +#include <drm/drmP.h> +#include "simpledrm.h" + +static const struct file_operations sdrm_drm_fops = { + .owner = THIS_MODULE, + .open = drm_open, + .mmap = sdrm_drm_mmap, + .poll = drm_poll, + .read = drm_read, + .unlocked_ioctl = drm_ioctl, + .release = drm_release, + .fasync = drm_fasync, +#ifdef CONFIG_COMPAT + .compat_ioctl = drm_compat_ioctl, +#endif + .llseek = noop_llseek, +}; + +static struct drm_driver sdrm_drm_driver = { + .driver_features = DRIVER_MODESET | DRIVER_GEM, + .load = sdrm_drm_load, + .unload = sdrm_drm_unload, + .fops = &sdrm_drm_fops, + + .gem_init_object = sdrm_gem_init_object, + .gem_free_object = sdrm_gem_free_object, + + .dumb_create = sdrm_dumb_create, + .dumb_map_offset = sdrm_dumb_map_offset, + .dumb_destroy = sdrm_dumb_destroy, + + .name = "simpledrm", + .desc = "Simple firmware framebuffer DRM driver", + .date = "20130601", + .major = 0, + .minor = 0, + .patchlevel = 1, +}; + +static int parse_dt(struct platform_device *pdev, + struct simplefb_platform_data *mode) +{ + struct device_node *np = pdev->dev.of_node; + const char *format; + int ret; + + if (!np) + return -ENODEV; + + ret = of_property_read_u32(np, "width", &mode->width); + if (ret) { + dev_err(&pdev->dev, "Can't parse width property\n"); + return ret; + } + + ret = of_property_read_u32(np, "height", &mode->height); + if (ret) { + dev_err(&pdev->dev, "Can't parse height property\n"); + return ret; + } + + ret = of_property_read_u32(np, "stride", &mode->stride); + if (ret) { + dev_err(&pdev->dev, "Can't parse stride property\n"); + return ret; + } + + ret = of_property_read_string(np, "format", &format); + if (ret) { + dev_err(&pdev->dev, "Can't parse format property\n"); + return ret; + } + strlcpy(mode->format, format, sizeof(mode->format)); + + return 0; +} + +static struct simplefb_format simplefb_formats[] = { + SIMPLEFB_FORMATS +}; + +int sdrm_pdev_init(struct sdrm_device *sdrm) +{ + struct platform_device *pdev = sdrm->ddev->platformdev; + struct simplefb_platform_data *mode = pdev->dev.platform_data; + struct simplefb_platform_data pmode; + struct resource *mem; + unsigned int depth; + int ret, i, bpp; + + if (!mode) { + mode = &pmode; + ret = parse_dt(pdev, mode); + if (ret) + return ret; + } + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!mem) { + dev_err(sdrm->ddev->dev, "No memory resource\n"); + return -ENODEV; + } + + for (i = 0; i < ARRAY_SIZE(simplefb_formats); ++i) { + if (strcmp(mode->format, simplefb_formats[i].name)) + continue; + + sdrm->fb_sformat = &simplefb_formats[i]; + sdrm->fb_format = simplefb_formats[i].fourcc; + sdrm->fb_width = mode->width; + sdrm->fb_height = mode->height; + sdrm->fb_stride = mode->stride; + sdrm->fb_base = mem->start; + sdrm->fb_size = resource_size(mem); + break; + } + + if (i >= ARRAY_SIZE(simplefb_formats)) { + dev_err(sdrm->ddev->dev, "Unknown format %s\n", mode->format); + return -ENODEV; + } + + drm_fb_get_bpp_depth(sdrm->fb_format, &depth, &bpp); + if (!bpp) { + dev_err(sdrm->ddev->dev, "Unknown format %s\n", mode->format); + return -ENODEV; + } + + if (sdrm->fb_size < sdrm->fb_stride * sdrm->fb_height) { + dev_err(sdrm->ddev->dev, "FB too small\n"); + return -ENODEV; + } else if ((bpp + 7) / 8 * sdrm->fb_width > sdrm->fb_stride) { + dev_err(sdrm->ddev->dev, "Invalid stride\n"); + return -ENODEV; + } + + sdrm->fb_bpp = bpp; + + if (!request_mem_region(sdrm->fb_base, sdrm->fb_size, + "simple-framebuffer")) { + dev_err(sdrm->ddev->dev, "cannot reserve VMEM\n"); + return -EIO; + } + + sdrm->fb_map = ioremap(sdrm->fb_base, sdrm->fb_size); + if (!sdrm->fb_map) { + dev_err(sdrm->ddev->dev, "cannot remap VMEM\n"); + ret = -EIO; + goto err_region; + } + + return 0; + +err_region: + release_mem_region(sdrm->fb_base, sdrm->fb_size); + return ret; +} + +void sdrm_pdev_destroy(struct sdrm_device *sdrm) +{ + if (sdrm->fb_map) { + iounmap(sdrm->fb_map); + release_mem_region(sdrm->fb_base, sdrm->fb_size); + sdrm->fb_map = NULL; + } +} + +static int sdrm_simplefb_probe(struct platform_device *pdev) +{ + return drm_platform_init(&sdrm_drm_driver, pdev); +} + +static int sdrm_simplefb_remove(struct platform_device *pdev) +{ + drm_platform_exit(&sdrm_drm_driver, pdev); + + return 0; +} + +static const struct of_device_id simplefb_of_match[] = { + { .compatible = "simple-framebuffer", }, + { }, +}; +MODULE_DEVICE_TABLE(of, simplefb_of_match); + +static struct platform_driver sdrm_simplefb_driver = { + .probe = sdrm_simplefb_probe, + .remove = sdrm_simplefb_remove, + .driver = { + .name = "simple-framebuffer", + .mod_name = KBUILD_MODNAME, + .owner = THIS_MODULE, + .of_match_table = simplefb_of_match, + }, +}; + +static int __init sdrm_init(void) +{ + return platform_driver_register(&sdrm_simplefb_driver); +} + +static void __exit sdrm_exit(void) +{ + platform_driver_unregister(&sdrm_simplefb_driver); +} + +module_init(sdrm_init); +module_exit(sdrm_exit); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("David Herrmann dh.herrmann@gmail.com"); +MODULE_DESCRIPTION("Simple firmware framebuffer DRM driver"); diff --git a/drivers/gpu/drm/simpledrm/simpledrm_main.c b/drivers/gpu/drm/simpledrm/simpledrm_main.c new file mode 100644 index 0000000..dcc3d0a --- /dev/null +++ b/drivers/gpu/drm/simpledrm/simpledrm_main.c @@ -0,0 +1,330 @@ +/* + * SimpleDRM firmware framebuffer driver + * Copyright (c) 2012-2013 David Herrmann dh.herrmann@gmail.com + */ + +/* + * 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 <linux/errno.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/string.h> +#include <drm/drmP.h> +#include <drm/drm_crtc.h> +#include "simpledrm.h" + +/* crtcs */ + +static int sdrm_crtc_set_config(struct drm_mode_set *set) +{ + struct drm_device *ddev; + struct sdrm_device *sdrm; + struct sdrm_framebuffer *fb; + + if (!set || !set->crtc) + return -EINVAL; + + ddev = set->crtc->dev; + sdrm = ddev->dev_private; + + if (set->crtc != &sdrm->crtc) + return -EINVAL; + + if (!set->mode || !set->fb || !set->num_connectors) { + sdrm->conn.encoder = NULL; + sdrm->conn.dpms = DRM_MODE_DPMS_OFF; + sdrm->enc.crtc = NULL; + sdrm->crtc.fb = NULL; + sdrm->crtc.enabled = false; + return 0; + } + + fb = to_sdrm_fb(set->fb); + + if (set->num_connectors != 1 || set->connectors[0] != &sdrm->conn) + return -EINVAL; + if (set->x || set->y) + return -EINVAL; + if (set->mode->hdisplay != sdrm->fb_width || + set->mode->vdisplay != sdrm->fb_height) + return -EINVAL; + + sdrm->conn.encoder = &sdrm->enc; + sdrm->conn.dpms = DRM_MODE_DPMS_ON; + sdrm->enc.crtc = &sdrm->crtc; + sdrm->crtc.fb = set->fb; + sdrm->crtc.enabled = true; + sdrm->crtc.mode = *set->mode; + sdrm->crtc.hwmode = *set->mode; + sdrm->crtc.x = 0; + sdrm->crtc.y = 0; + + drm_calc_timestamping_constants(&sdrm->crtc); + return 0; +} + +static const struct drm_crtc_funcs sdrm_crtc_ops = { + .set_config = sdrm_crtc_set_config, + .destroy = drm_crtc_cleanup, +}; + +/* encoders */ + +static const struct drm_encoder_funcs sdrm_enc_ops = { + .destroy = drm_encoder_cleanup, +}; + +/* connectors */ + +static void sdrm_conn_dpms(struct drm_connector *conn, int mode) +{ + conn->dpms = mode; +} + +static enum drm_connector_status sdrm_conn_detect(struct drm_connector *conn, + bool force) +{ + /* We simulate an always connected monitor. simple-fb doesn't + * provide any way to detect whether the connector is active. Hence, + * signal DRM core that it is always connected. */ + + return connector_status_connected; +} + +static int sdrm_conn_fill_modes(struct drm_connector *conn, uint32_t max_x, + uint32_t max_y) +{ + struct sdrm_device *sdrm = conn->dev->dev_private; + struct drm_display_mode *mode; + int ret; + + if (conn->force == DRM_FORCE_ON) + conn->status = connector_status_connected; + else if (conn->force) + conn->status = connector_status_disconnected; + else + conn->status = connector_status_connected; + + list_for_each_entry(mode, &conn->modes, head) + mode->status = MODE_UNVERIFIED; + + mode = drm_gtf_mode(sdrm->ddev, sdrm->fb_width, sdrm->fb_height, + 60, 0, 0); + if (mode) { + mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; + drm_mode_probed_add(conn, mode); + sdrm->mode = mode; + drm_mode_connector_list_update(conn); + ret = 1; + } else { + ret = 0; + } + + if (max_x && max_y) + drm_mode_validate_size(conn->dev, &conn->modes, + max_x, max_y, 0); + + drm_mode_prune_invalid(conn->dev, &conn->modes, false); + if (list_empty(&conn->modes)) + return 0; + + drm_mode_sort(&conn->modes); + + list_for_each_entry(mode, &conn->modes, head) { + mode->vrefresh = drm_mode_vrefresh(mode); + drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); + } + + return ret; +} + +static void sdrm_conn_destroy(struct drm_connector *conn) +{ + /* Remove the fake-connector from sysfs and then let the DRM core + * clean up all associated resources. */ + if (device_is_registered(&conn->kdev)) + drm_sysfs_connector_remove(conn); + drm_connector_cleanup(conn); +} + +static const struct drm_connector_funcs sdrm_conn_ops = { + .dpms = sdrm_conn_dpms, + .detect = sdrm_conn_detect, + .fill_modes = sdrm_conn_fill_modes, + .destroy = sdrm_conn_destroy, +}; + +/* framebuffers */ + +static int sdrm_fb_create_handle(struct drm_framebuffer *fb, + struct drm_file *dfile, + unsigned int *handle) +{ + struct sdrm_framebuffer *sfb = to_sdrm_fb(fb); + + return drm_gem_handle_create(dfile, &sfb->obj->base, handle); +} + +static void sdrm_fb_destroy(struct drm_framebuffer *fb) +{ + struct sdrm_framebuffer *sfb = to_sdrm_fb(fb); + + drm_framebuffer_cleanup(fb); + drm_gem_object_unreference_unlocked(&sfb->obj->base); + kfree(sfb); +} + +static const struct drm_framebuffer_funcs sdrm_fb_ops = { + .create_handle = sdrm_fb_create_handle, + .destroy = sdrm_fb_destroy, +}; + +static struct drm_framebuffer *sdrm_fb_create(struct drm_device *ddev, + struct drm_file *dfile, + struct drm_mode_fb_cmd2 *cmd) +{ + struct sdrm_device *sdrm = ddev->dev_private; + struct sdrm_framebuffer *fb; + struct drm_gem_object *gobj; + int ret, i; + void *err; + + if (cmd->flags || cmd->pixel_format != sdrm->fb_format) + return ERR_PTR(-EINVAL); + if (cmd->height != sdrm->fb_height || cmd->width != sdrm->fb_width) + return ERR_PTR(-EINVAL); + if (cmd->offsets[0] || cmd->pitches[0] != sdrm->fb_stride) + return ERR_PTR(-EINVAL); + + gobj = drm_gem_object_lookup(ddev, dfile, cmd->handles[0]); + if (!gobj) + return ERR_PTR(-EINVAL); + + fb = kzalloc(sizeof(*fb), GFP_KERNEL); + if (!fb) { + err = ERR_PTR(-ENOMEM); + goto err_unref; + } + fb->obj = to_sdrm_bo(gobj); + + fb->base.pitches[0] = cmd->pitches[0]; + fb->base.offsets[0] = cmd->offsets[0]; + for (i = 1; i < 4; i++) { + fb->base.pitches[i] = 0; + fb->base.offsets[i] = 0; + } + + fb->base.width = cmd->width; + fb->base.height = cmd->height; + fb->base.pixel_format = cmd->pixel_format; + drm_fb_get_bpp_depth(cmd->pixel_format, &fb->base.depth, + &fb->base.bits_per_pixel); + + ret = drm_framebuffer_init(ddev, &fb->base, &sdrm_fb_ops); + if (ret < 0) { + err = ERR_PTR(ret); + goto err_free; + } + + return &fb->base; + +err_free: + kfree(fb); +err_unref: + drm_gem_object_unreference_unlocked(gobj); + return err; +} + +static const struct drm_mode_config_funcs sdrm_mode_config_ops = { + .fb_create = sdrm_fb_create, +}; + +/* initialization */ + +int sdrm_drm_load(struct drm_device *ddev, unsigned long flags) +{ + struct sdrm_device *sdrm; + int ret; + + sdrm = kzalloc(sizeof(*sdrm), GFP_KERNEL); + if (!sdrm) + return -ENOMEM; + + sdrm->ddev = ddev; + ddev->dev_private = sdrm; + + ddev->devname = kstrdup("simpledrm", GFP_KERNEL); + if (!ddev->devname) { + ret = -ENOMEM; + goto err_free; + } + + ret = sdrm_pdev_init(sdrm); + if (ret) + goto err_name; + + drm_mode_config_init(ddev); + ddev->mode_config.min_width = 0; + ddev->mode_config.min_height = 0; + ddev->mode_config.max_width = 8192; + ddev->mode_config.max_height = 8192; + ddev->mode_config.funcs = &sdrm_mode_config_ops; + + ret = drm_crtc_init(ddev, &sdrm->crtc, &sdrm_crtc_ops); + if (ret) + goto err_cleanup; + + sdrm->enc.possible_crtcs = 1; + sdrm->enc.possible_clones = 0; + ret = drm_encoder_init(ddev, &sdrm->enc, &sdrm_enc_ops, + DRM_MODE_ENCODER_VIRTUAL); + if (ret) + goto err_cleanup; + + sdrm->conn.display_info.width_mm = 0; + sdrm->conn.display_info.height_mm = 0; + sdrm->conn.interlace_allowed = false; + sdrm->conn.doublescan_allowed = false; + sdrm->conn.polled = 0; + ret = drm_connector_init(ddev, &sdrm->conn, &sdrm_conn_ops, + DRM_MODE_CONNECTOR_VIRTUAL); + if (ret) + goto err_cleanup; + + ret = drm_mode_connector_attach_encoder(&sdrm->conn, &sdrm->enc); + if (ret) + goto err_cleanup; + + ret = drm_sysfs_connector_add(&sdrm->conn); + if (ret) + goto err_cleanup; + + return 0; + +err_cleanup: + drm_mode_config_cleanup(ddev); + sdrm_pdev_destroy(sdrm); +err_name: + kfree(ddev->devname); + ddev->devname = NULL; +err_free: + kfree(sdrm); + return ret; +} + +int sdrm_drm_unload(struct drm_device *ddev) +{ + struct sdrm_device *sdrm = ddev->dev_private; + + drm_mode_config_cleanup(ddev); + sdrm_pdev_destroy(sdrm); + kfree(sdrm); + + return 0; +} diff --git a/drivers/gpu/drm/simpledrm/simpledrm_mem.c b/drivers/gpu/drm/simpledrm/simpledrm_mem.c new file mode 100644 index 0000000..afadcf5 --- /dev/null +++ b/drivers/gpu/drm/simpledrm/simpledrm_mem.c @@ -0,0 +1,254 @@ +/* + * SimpleDRM firmware framebuffer driver + * Copyright (c) 2012-2013 David Herrmann dh.herrmann@gmail.com + */ + +/* + * 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 <linux/errno.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/string.h> +#include <drm/drmP.h> +#include "simpledrm.h" + +/* + * Create GEM Object + * Allocates a new GEM object to manage the physical memory at @fb_base with + * size @fb_size. Both parameters must be page-aligned and point to the + * physical memory of the framebuffer to manage. They must not have a + * "struct page" and have to be reserved before. + * It is the callers responsibility to create only one object per framebuffer. + */ +static struct sdrm_gem_object *sdrm_gem_alloc_object(struct drm_device *ddev, + unsigned long fb_base, + unsigned long fb_size) +{ + struct sdrm_gem_object *obj; + + WARN_ON((fb_base & ~PAGE_MASK) != 0); + WARN_ON((fb_size & ~PAGE_MASK) != 0); + + /* align to page-size */ + fb_size = fb_size + (fb_base & ~PAGE_MASK); + fb_base = fb_base & PAGE_MASK; + fb_size = PAGE_ALIGN(fb_size); + + if (fb_base + fb_size < fb_base) + return NULL; + + obj = kzalloc(sizeof(*obj), GFP_KERNEL); + if (!obj) + return NULL; + obj->fb_base = fb_base; + obj->fb_size = fb_size; + + if (drm_gem_private_object_init(ddev, &obj->base, fb_size)) { + kfree(obj); + return NULL; + } + + return obj; +} + +/* drm_gem_object_alloc() is not supported */ +int sdrm_gem_init_object(struct drm_gem_object *gobj) +{ + return -EINVAL; +} + +/* + * Unmap GEM Object + * Destroy any memory-mappings that user-space created on this object. Note + * that this will cause SIGBUS errors if user-space continues writing to it. + * There is no way to remap the pages in fault-handlers as this is not what + * we want. You should destroy the mappings only when destroying the object + * so no remapping will be needed. + * It's the callers responsibility to prevent any further mappings. This only + * destroys all current mappings. + */ +void sdrm_gem_unmap_object(struct sdrm_gem_object *obj) +{ + struct drm_device *ddev = obj->base.dev; + loff_t off; + + off = obj->base.map_list.hash.key << PAGE_SHIFT; + unmap_mapping_range(ddev->dev_mapping, off, obj->fb_size, 1); +} + +/* + * Free GEM Object + * Frees the given GEM object. It does not release the framebuffer memory that + * was passed during allocation, but destroys all user-space mappings. + */ +void sdrm_gem_free_object(struct drm_gem_object *gobj) +{ + struct sdrm_gem_object *obj = to_sdrm_bo(gobj); + struct drm_device *ddev = gobj->dev; + struct sdrm_device *sdrm = ddev->dev_private; + + if (sdrm->fb_obj == obj) + sdrm->fb_obj = NULL; + + sdrm_gem_unmap_object(obj); + + if (gobj->map_list.map) + drm_gem_free_mmap_offset(gobj); + drm_gem_object_release(gobj); + kfree(obj); +} + +/* + * Create Dumb Buffer + * IOCTL backend for dumb-buffers. We only support one framebuffer per + * simple-DRM device so this function fails if there is already a framebuffer + * allocated. If not, an initial GEM-object plus framebuffer is created and + * forwarded to the caller. + * + * We could try to kill off the previous framebuffer and create a new one for + * the caller. However, user-space often allocates two buffers in a row to + * allow double-buffering. If we kill the previous buffer, user-space would + * have no chance to notice that only one buffer is available. + * + * So user-space must make sure they either destroy their buffer when dropping + * DRM-Master or leave the CRTC intact and let others share the buffer via + * drmModeGetFB(). + * + * The buffer parameters must be the same as from the default-mode of the CRTC. + * No other sizes can be supported! + */ +int sdrm_dumb_create(struct drm_file *dfile, struct drm_device *ddev, + struct drm_mode_create_dumb *args) +{ + struct drm_device *dev = dfile->minor->dev; + struct sdrm_device *sdrm = dev->dev_private; + struct sdrm_gem_object *obj; + int ret; + + /* only allow one framebuffer at a time */ + if (sdrm->fb_obj) + return -ENOMEM; + + if (args->width != sdrm->fb_width || + args->height != sdrm->fb_height || + args->bpp != sdrm->fb_bpp || + args->flags) + return -EINVAL; + + args->pitch = sdrm->fb_stride; + args->size = sdrm->fb_size; + obj = sdrm_gem_alloc_object(ddev, sdrm->fb_base, sdrm->fb_size); + if (!obj) + return -ENOMEM; + + ret = drm_gem_handle_create(dfile, &obj->base, &args->handle); + if (ret) { + drm_gem_object_unreference(&obj->base); + return ret; + } + + /* fb_obj is cleared by sdrm_gem_free_object() */ + sdrm->fb_obj = obj; + drm_gem_object_unreference(&obj->base); + + return 0; +} + +int sdrm_dumb_destroy(struct drm_file *dfile, struct drm_device *ddev, + uint32_t handle) +{ + return drm_gem_handle_delete(dfile, handle); +} + +int sdrm_dumb_map_offset(struct drm_file *dfile, struct drm_device *ddev, + uint32_t handle, uint64_t *offset) +{ + struct drm_gem_object *gobj; + int ret; + + mutex_lock(&ddev->struct_mutex); + + gobj = drm_gem_object_lookup(ddev, dfile, handle); + if (!gobj) { + ret = -ENOENT; + goto out_unlock; + } + + if (!gobj->map_list.map) { + ret = drm_gem_create_mmap_offset(gobj); + if (ret) + goto out_unref; + } + + *offset = gobj->map_list.hash.key << PAGE_SHIFT; + +out_unref: + drm_gem_object_unreference(gobj); +out_unlock: + mutex_unlock(&ddev->struct_mutex); + return ret; +} + +/* + * mmap ioctl + * We simply map the physical range of the FB into user-space as requested. We + * perform few sanity-checks and then let io_remap_pfn_range() do all the work. + * No vma_ops are needed this way as pages are either cleared or present. + */ +int sdrm_drm_mmap(struct file *filp, struct vm_area_struct *vma) +{ + struct drm_file *priv = filp->private_data; + struct drm_device *dev = priv->minor->dev; + struct drm_gem_mm *mm = dev->mm_private; + struct drm_local_map *map; + struct drm_hash_item *item; + struct drm_gem_object *gobj; + struct sdrm_gem_object *obj; + unsigned long len; + int ret; + + mutex_lock(&dev->struct_mutex); + + if (drm_ht_find_item(&mm->offset_hash, vma->vm_pgoff, &item)) { + mutex_unlock(&dev->struct_mutex); + return drm_mmap(filp, vma); + } + + map = drm_hash_entry(item, struct drm_map_list, hash)->map; + if (!map || + ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) { + ret = -EPERM; + goto out_unlock; + } + + gobj = map->handle; + obj = to_sdrm_bo(gobj); + + vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; + vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); + vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); + /* FIXME: do we need fb_pgprotect() here? */ + + /* verify mapping size */ + len = vma->vm_end - vma->vm_start; + if (len > obj->fb_size) { + ret = -EINVAL; + goto out_unlock; + } + + /* This object is _not_ referenced here. Therefore, we _must_ destroy + * the mapping before destroying the bo! */ + + ret = io_remap_pfn_range(vma, vma->vm_start, obj->fb_base >> PAGE_SHIFT, + obj->fb_size, vma->vm_page_prot); + +out_unlock: + mutex_unlock(&dev->struct_mutex); + return ret; +}