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![Imre Deak](/assets/img/avatar_default.png)
So far during driver unload we called drm_framebuffer_cleanup() for the fbdev fb, which only removes the fb from the drm fb list regardless of its reference count, but leaves the fb bound on an active crtc. Since the fb's backing storage was freed this could mean we scan some random memory content out afterwards. It's not a big issue since the fb is allocated from stolen memory and afaik there is no other user for that than i915. It's still cleaner to properly unbind the fb and disable the crtc, which is what drm_framebuffer_remove() does. Note that after commit 88891eb1e9eca0ba619518bed31580f91e9cf84d Author: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Mon Feb 10 18:00:38 2014 +0100 we call drm_framebuffer_cleanup() only after dropping the last reference on the fb, but that won't happen since we don't unbind the fb. This results in a drm core warn about a leaked fb. Signed-off-by: Imre Deak <imre.deak@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
358 lines
9.5 KiB
C
358 lines
9.5 KiB
C
/*
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* Copyright © 2007 David Airlie
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* David Airlie
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/tty.h>
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#include <linux/sysrq.h>
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#include <linux/delay.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/vga_switcheroo.h>
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#include <drm/drmP.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_fb_helper.h>
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#include "intel_drv.h"
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#include <drm/i915_drm.h>
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#include "i915_drv.h"
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static struct fb_ops intelfb_ops = {
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.owner = THIS_MODULE,
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.fb_check_var = drm_fb_helper_check_var,
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.fb_set_par = drm_fb_helper_set_par,
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.fb_fillrect = cfb_fillrect,
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.fb_copyarea = cfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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.fb_pan_display = drm_fb_helper_pan_display,
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.fb_blank = drm_fb_helper_blank,
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.fb_setcmap = drm_fb_helper_setcmap,
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.fb_debug_enter = drm_fb_helper_debug_enter,
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.fb_debug_leave = drm_fb_helper_debug_leave,
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};
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static int intelfb_alloc(struct drm_fb_helper *helper,
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struct drm_fb_helper_surface_size *sizes)
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{
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struct intel_fbdev *ifbdev =
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container_of(helper, struct intel_fbdev, helper);
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struct drm_framebuffer *fb;
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struct drm_device *dev = helper->dev;
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struct drm_mode_fb_cmd2 mode_cmd = {};
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struct drm_i915_gem_object *obj;
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int size, ret;
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/* we don't do packed 24bpp */
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if (sizes->surface_bpp == 24)
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sizes->surface_bpp = 32;
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mode_cmd.width = sizes->surface_width;
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mode_cmd.height = sizes->surface_height;
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mode_cmd.pitches[0] = ALIGN(mode_cmd.width *
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DIV_ROUND_UP(sizes->surface_bpp, 8), 64);
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mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
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sizes->surface_depth);
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size = mode_cmd.pitches[0] * mode_cmd.height;
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size = ALIGN(size, PAGE_SIZE);
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obj = i915_gem_object_create_stolen(dev, size);
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if (obj == NULL)
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obj = i915_gem_alloc_object(dev, size);
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if (!obj) {
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DRM_ERROR("failed to allocate framebuffer\n");
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ret = -ENOMEM;
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goto out;
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}
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/* Flush everything out, we'll be doing GTT only from now on */
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ret = intel_pin_and_fence_fb_obj(dev, obj, NULL);
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if (ret) {
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DRM_ERROR("failed to pin obj: %d\n", ret);
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goto out_unref;
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}
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fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
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if (IS_ERR(fb)) {
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ret = PTR_ERR(fb);
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goto out_unpin;
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}
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ifbdev->fb = to_intel_framebuffer(fb);
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return 0;
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out_unpin:
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i915_gem_object_ggtt_unpin(obj);
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out_unref:
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drm_gem_object_unreference(&obj->base);
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out:
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return ret;
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}
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static int intelfb_create(struct drm_fb_helper *helper,
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struct drm_fb_helper_surface_size *sizes)
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{
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struct intel_fbdev *ifbdev =
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container_of(helper, struct intel_fbdev, helper);
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struct intel_framebuffer *intel_fb = ifbdev->fb;
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struct drm_device *dev = helper->dev;
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struct drm_i915_private *dev_priv = dev->dev_private;
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struct fb_info *info;
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struct drm_framebuffer *fb;
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struct drm_i915_gem_object *obj;
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int size, ret;
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mutex_lock(&dev->struct_mutex);
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if (!intel_fb || WARN_ON(!intel_fb->obj)) {
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DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
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ret = intelfb_alloc(helper, sizes);
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if (ret)
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goto out_unlock;
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intel_fb = ifbdev->fb;
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} else {
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DRM_DEBUG_KMS("re-using BIOS fb\n");
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sizes->fb_width = intel_fb->base.width;
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sizes->fb_height = intel_fb->base.height;
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}
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obj = intel_fb->obj;
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size = obj->base.size;
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info = framebuffer_alloc(0, &dev->pdev->dev);
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if (!info) {
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ret = -ENOMEM;
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goto out_unpin;
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}
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info->par = helper;
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fb = &ifbdev->fb->base;
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ifbdev->helper.fb = fb;
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ifbdev->helper.fbdev = info;
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strcpy(info->fix.id, "inteldrmfb");
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info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
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info->fbops = &intelfb_ops;
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ret = fb_alloc_cmap(&info->cmap, 256, 0);
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if (ret) {
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ret = -ENOMEM;
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goto out_unpin;
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}
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/* setup aperture base/size for vesafb takeover */
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info->apertures = alloc_apertures(1);
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if (!info->apertures) {
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ret = -ENOMEM;
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goto out_unpin;
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}
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info->apertures->ranges[0].base = dev->mode_config.fb_base;
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info->apertures->ranges[0].size = dev_priv->gtt.mappable_end;
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info->fix.smem_start = dev->mode_config.fb_base + i915_gem_obj_ggtt_offset(obj);
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info->fix.smem_len = size;
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info->screen_base =
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ioremap_wc(dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj),
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size);
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if (!info->screen_base) {
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ret = -ENOSPC;
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goto out_unpin;
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}
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info->screen_size = size;
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/* This driver doesn't need a VT switch to restore the mode on resume */
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info->skip_vt_switch = true;
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drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
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drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);
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/* If the object is shmemfs backed, it will have given us zeroed pages.
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* If the object is stolen however, it will be full of whatever
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* garbage was left in there.
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*/
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if (ifbdev->fb->obj->stolen)
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memset_io(info->screen_base, 0, info->screen_size);
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/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
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DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08lx, bo %p\n",
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fb->width, fb->height,
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i915_gem_obj_ggtt_offset(obj), obj);
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mutex_unlock(&dev->struct_mutex);
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vga_switcheroo_client_fb_set(dev->pdev, info);
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return 0;
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out_unpin:
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i915_gem_object_ggtt_unpin(obj);
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drm_gem_object_unreference(&obj->base);
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out_unlock:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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/** Sets the color ramps on behalf of RandR */
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static void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
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u16 blue, int regno)
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{
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struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
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intel_crtc->lut_r[regno] = red >> 8;
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intel_crtc->lut_g[regno] = green >> 8;
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intel_crtc->lut_b[regno] = blue >> 8;
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}
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static void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
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u16 *blue, int regno)
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{
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struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
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*red = intel_crtc->lut_r[regno] << 8;
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*green = intel_crtc->lut_g[regno] << 8;
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*blue = intel_crtc->lut_b[regno] << 8;
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}
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static struct drm_fb_helper_funcs intel_fb_helper_funcs = {
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.gamma_set = intel_crtc_fb_gamma_set,
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.gamma_get = intel_crtc_fb_gamma_get,
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.fb_probe = intelfb_create,
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};
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static void intel_fbdev_destroy(struct drm_device *dev,
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struct intel_fbdev *ifbdev)
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{
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if (ifbdev->helper.fbdev) {
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struct fb_info *info = ifbdev->helper.fbdev;
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unregister_framebuffer(info);
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iounmap(info->screen_base);
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if (info->cmap.len)
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fb_dealloc_cmap(&info->cmap);
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framebuffer_release(info);
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}
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drm_fb_helper_fini(&ifbdev->helper);
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drm_framebuffer_unregister_private(&ifbdev->fb->base);
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drm_framebuffer_remove(&ifbdev->fb->base);
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}
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int intel_fbdev_init(struct drm_device *dev)
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{
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struct intel_fbdev *ifbdev;
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struct drm_i915_private *dev_priv = dev->dev_private;
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int ret;
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ifbdev = kzalloc(sizeof(*ifbdev), GFP_KERNEL);
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if (!ifbdev)
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return -ENOMEM;
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dev_priv->fbdev = ifbdev;
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ifbdev->helper.funcs = &intel_fb_helper_funcs;
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ret = drm_fb_helper_init(dev, &ifbdev->helper,
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INTEL_INFO(dev)->num_pipes,
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4);
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if (ret) {
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kfree(ifbdev);
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return ret;
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}
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drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
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return 0;
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}
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void intel_fbdev_initial_config(struct drm_device *dev)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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/* Due to peculiar init order wrt to hpd handling this is separate. */
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drm_fb_helper_initial_config(&dev_priv->fbdev->helper, 32);
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}
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void intel_fbdev_fini(struct drm_device *dev)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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if (!dev_priv->fbdev)
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return;
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intel_fbdev_destroy(dev, dev_priv->fbdev);
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kfree(dev_priv->fbdev);
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dev_priv->fbdev = NULL;
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}
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void intel_fbdev_set_suspend(struct drm_device *dev, int state)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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struct intel_fbdev *ifbdev = dev_priv->fbdev;
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struct fb_info *info;
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if (!ifbdev)
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return;
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info = ifbdev->helper.fbdev;
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/* On resume from hibernation: If the object is shmemfs backed, it has
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* been restored from swap. If the object is stolen however, it will be
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* full of whatever garbage was left in there.
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*/
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if (state == FBINFO_STATE_RUNNING && ifbdev->fb->obj->stolen)
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memset_io(info->screen_base, 0, info->screen_size);
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fb_set_suspend(info, state);
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}
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void intel_fbdev_output_poll_changed(struct drm_device *dev)
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{
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struct drm_i915_private *dev_priv = dev->dev_private;
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drm_fb_helper_hotplug_event(&dev_priv->fbdev->helper);
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}
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void intel_fbdev_restore_mode(struct drm_device *dev)
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{
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int ret;
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struct drm_i915_private *dev_priv = dev->dev_private;
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if (INTEL_INFO(dev)->num_pipes == 0)
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return;
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drm_modeset_lock_all(dev);
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ret = drm_fb_helper_restore_fbdev_mode(&dev_priv->fbdev->helper);
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if (ret)
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DRM_DEBUG("failed to restore crtc mode\n");
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drm_modeset_unlock_all(dev);
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}
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