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* Copyright 2012 Red Hat
*
* This file is subject to the terms and conditions of the GNU General
* Public License version 2. See the file COPYING in the main
* directory of this archive for more details.
*
* Authors: Matthew Garrett
* Dave Airlie
*/
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include "cirrus_drv.h"
static void cirrus_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
struct cirrus_framebuffer *cirrus_fb = to_cirrus_framebuffer(fb);
if (cirrus_fb->obj)
drm_gem_object_unreference_unlocked(cirrus_fb->obj);
drm_framebuffer_cleanup(fb);
kfree(fb);
}
static const struct drm_framebuffer_funcs cirrus_fb_funcs = {
.destroy = cirrus_user_framebuffer_destroy,
};
int cirrus_framebuffer_init(struct drm_device *dev,
struct cirrus_framebuffer *gfb,
struct drm_mode_fb_cmd2 *mode_cmd,
struct drm_gem_object *obj)
{
int ret;
drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
gfb->obj = obj;
ret = drm_framebuffer_init(dev, &gfb->base, &cirrus_fb_funcs);
if (ret) {
DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
return ret;
}
return 0;
}
static struct drm_framebuffer *
cirrus_user_framebuffer_create(struct drm_device *dev,
struct drm_file *filp,
struct drm_mode_fb_cmd2 *mode_cmd)
{
struct cirrus_device *cdev = dev->dev_private;
struct drm_gem_object *obj;
struct cirrus_framebuffer *cirrus_fb;
int ret;
u32 bpp, depth;
drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
if (!cirrus_check_framebuffer(cdev, mode_cmd->width, mode_cmd->height,
bpp, mode_cmd->pitches[0]))
return ERR_PTR(-EINVAL);
obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
if (obj == NULL)
return ERR_PTR(-ENOENT);
cirrus_fb = kzalloc(sizeof(*cirrus_fb), GFP_KERNEL);
if (!cirrus_fb) {
drm_gem_object_unreference_unlocked(obj);
return ERR_PTR(-ENOMEM);
}
ret = cirrus_framebuffer_init(dev, cirrus_fb, mode_cmd, obj);
if (ret) {
drm_gem_object_unreference_unlocked(obj);
kfree(cirrus_fb);
return ERR_PTR(ret);
}
return &cirrus_fb->base;
}
static const struct drm_mode_config_funcs cirrus_mode_funcs = {
.fb_create = cirrus_user_framebuffer_create,
};
/* Unmap the framebuffer from the core and release the memory */
static void cirrus_vram_fini(struct cirrus_device *cdev)
{
iounmap(cdev->rmmio);
cdev->rmmio = NULL;
if (cdev->mc.vram_base)
release_mem_region(cdev->mc.vram_base, cdev->mc.vram_size);
}
/* Map the framebuffer from the card and configure the core */
static int cirrus_vram_init(struct cirrus_device *cdev)
{
/* BAR 0 is VRAM */
cdev->mc.vram_base = pci_resource_start(cdev->dev->pdev, 0);
cdev->mc.vram_size = pci_resource_len(cdev->dev->pdev, 0);
if (!request_mem_region(cdev->mc.vram_base, cdev->mc.vram_size,
"cirrusdrmfb_vram")) {
DRM_ERROR("can't reserve VRAM\n");
return -ENXIO;
}
return 0;
}
/*
* Our emulated hardware has two sets of memory. One is video RAM and can
* simply be used as a linear framebuffer - the other provides mmio access
* to the display registers. The latter can also be accessed via IO port
* access, but we map the range and use mmio to program them instead
*/
int cirrus_device_init(struct cirrus_device *cdev,
struct drm_device *ddev,
struct pci_dev *pdev, uint32_t flags)
{
int ret;
cdev->dev = ddev;
cdev->flags = flags;
/* Hardcode the number of CRTCs to 1 */
cdev->num_crtc = 1;
/* BAR 0 is the framebuffer, BAR 1 contains registers */
cdev->rmmio_base = pci_resource_start(cdev->dev->pdev, 1);
cdev->rmmio_size = pci_resource_len(cdev->dev->pdev, 1);
if (!request_mem_region(cdev->rmmio_base, cdev->rmmio_size,
"cirrusdrmfb_mmio")) {
DRM_ERROR("can't reserve mmio registers\n");
return -ENOMEM;
}
cdev->rmmio = ioremap(cdev->rmmio_base, cdev->rmmio_size);
if (cdev->rmmio == NULL)
return -ENOMEM;
ret = cirrus_vram_init(cdev);
if (ret) {
release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
return ret;
}
return 0;
}
void cirrus_device_fini(struct cirrus_device *cdev)
{
release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
cirrus_vram_fini(cdev);
}
/*
* Functions here will be called by the core once it's bound the driver to
* a PCI device
*/
int cirrus_driver_load(struct drm_device *dev, unsigned long flags)
{
struct cirrus_device *cdev;
int r;
cdev = kzalloc(sizeof(struct cirrus_device), GFP_KERNEL);
if (cdev == NULL)
return -ENOMEM;
dev->dev_private = (void *)cdev;
r = cirrus_device_init(cdev, dev, dev->pdev, flags);
if (r) {
dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
goto out;
}
r = cirrus_mm_init(cdev);
if (r) {
dev_err(&dev->pdev->dev, "fatal err on mm init\n");
goto out;
}
r = cirrus_modeset_init(cdev);
if (r) {
dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
goto out;
}
dev->mode_config.funcs = (void *)&cirrus_mode_funcs;
return 0;
out:
cirrus_driver_unload(dev);
return r;
}
int cirrus_driver_unload(struct drm_device *dev)
{
struct cirrus_device *cdev = dev->dev_private;
if (cdev == NULL)
return 0;
cirrus_modeset_fini(cdev);
cirrus_mm_fini(cdev);
cirrus_device_fini(cdev);
kfree(cdev);
dev->dev_private = NULL;
return 0;
}
int cirrus_gem_create(struct drm_device *dev,
u32 size, bool iskernel,
struct drm_gem_object **obj)
{
struct cirrus_bo *cirrusbo;
int ret;
*obj = NULL;
size = roundup(size, PAGE_SIZE);
if (size == 0)
return -EINVAL;
ret = cirrus_bo_create(dev, size, 0, 0, &cirrusbo);
if (ret) {
if (ret != -ERESTARTSYS)
DRM_ERROR("failed to allocate GEM object\n");
return ret;
}
*obj = &cirrusbo->gem;
return 0;
}
int cirrus_dumb_create(struct drm_file *file,
struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
int ret;
struct drm_gem_object *gobj;
u32 handle;
args->pitch = args->width * ((args->bpp + 7) / 8);
args->size = args->pitch * args->height;
ret = cirrus_gem_create(dev, args->size, false,
&gobj);
if (ret)
return ret;
ret = drm_gem_handle_create(file, gobj, &handle);
drm_gem_object_unreference_unlocked(gobj);
if (ret)
return ret;
args->handle = handle;
return 0;
}
static void cirrus_bo_unref(struct cirrus_bo **bo)
{
struct ttm_buffer_object *tbo;
if ((*bo) == NULL)
return;
tbo = &((*bo)->bo);
ttm_bo_unref(&tbo);
*bo = NULL;
}
void cirrus_gem_free_object(struct drm_gem_object *obj)
{
struct cirrus_bo *cirrus_bo = gem_to_cirrus_bo(obj);
cirrus_bo_unref(&cirrus_bo);
}
static inline u64 cirrus_bo_mmap_offset(struct cirrus_bo *bo)
{
return drm_vma_node_offset_addr(&bo->bo.vma_node);
}
int
cirrus_dumb_mmap_offset(struct drm_file *file,
struct drm_device *dev,
uint32_t handle,
uint64_t *offset)
{
struct drm_gem_object *obj;
int ret;
struct cirrus_bo *bo;
mutex_lock(&dev->struct_mutex);
obj = drm_gem_object_lookup(dev, file, handle);
if (obj == NULL) {
ret = -ENOENT;
goto out_unlock;
}
bo = gem_to_cirrus_bo(obj);
*offset = cirrus_bo_mmap_offset(bo);
drm_gem_object_unreference(obj);
ret = 0;
out_unlock:
mutex_unlock(&dev->struct_mutex);
return ret;
}
bool cirrus_check_framebuffer(struct cirrus_device *cdev, int width, int height,
int bpp, int pitch)
{
const int max_pitch = 0x1FF << 3; /* (4096 - 1) & ~111b bytes */
const int max_size = cdev->mc.vram_size;
if (bpp > cirrus_bpp)
return false;
if (bpp > 32)
return false;
if (pitch > max_pitch)
return false;
if (pitch * height > max_size)
return false;
return true;
}
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