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