path: root/drivers/gpu/drm/vc4/vc4_gem.c

/*
 * Copyright © 2014 Broadcom
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/sched/signal.h>

#include "uapi/drm/vc4_drm.h"
#include "vc4_drv.h"
#include "vc4_regs.h"
#include "vc4_trace.h"

static void
vc4_queue_hangcheck(struct drm_device *dev)
{
	struct vc4_dev *vc4 = to_vc4_dev(dev);

	mod_timer(&vc4->hangcheck.timer,
		  round_jiffies_up(jiffies + msecs_to_jiffies(100)));
}

struct vc4_hang_state {
	struct drm_vc4_get_hang_state user_state;

	u32 bo_count;
	struct drm_gem_object **bo;
};

static void
vc4_free_hang_state(struct drm_device *dev, struct vc4_hang_state *state)
{
	unsigned int i;

	for (i = 0; i < state->user_state.bo_count; i++)
		drm_gem_object_put_unlocked(state->bo[i]);

	kfree(state);
}

int
vc4_get_hang_state_ioctl(struct drm_device *dev, void *data,
			 struct drm_file *file_priv)
{
	struct drm_vc4_get_hang_state *get_state = data;
	struct drm_vc4_get_hang_state_bo *bo_state;
	struct vc4_hang_state *kernel_state;
	struct drm_vc4_get_hang_state *state;
	struct vc4_dev *vc4 = to_vc4_dev(dev);
	unsigned long irqflags;
	u32 i;
	int ret = 0;

	spin_lock_irqsave(&vc4->job_lock, irqflags);
	kernel_state = vc4->hang_state;
	if (!kernel_state) {
		spin_unlock_irqrestore(&vc4->job_lock, irqflags);
		return -ENOENT;
	}
	state = &kernel_state->user_state;

	/* If the user's array isn't big enough, just return the
	 * required array size.
	 */
	if (get_state->bo_count < state->bo_count) {
		get_state->bo_count = state->bo_count;
		spin_unlock_irqrestore(&vc4->job_lock, irqflags);
		return 0;
	}

	vc4->hang_state = NULL;
	spin_unlock_irqrestore(&vc4->job_lock, irqflags);

	/* Save the user's BO pointer, so we don't stomp it with the memcpy. */
	state->bo = get_state->bo;
	memcpy(get_state, state, sizeof(*state));

	bo_state = kcalloc(state->bo_count, sizeof(*bo_state), GFP_KERNEL);
	if (!bo_state) {
		ret = -ENOMEM;
		goto err_free;
	}

	for (i = 0; i < state->bo_count; i++) {
		struct vc4_bo *vc4_bo = to_vc4_bo(kernel_state->bo[i]);
		u32 handle;

		ret = drm_gem_handle_create(file_priv, kernel_state->bo[i],
					    &handle);

		if (ret) {
			state->bo_count = i;
			goto err_delete_handle;
		}
		bo_state[i].handle = handle;
		bo_state[i].paddr = vc4_bo->base.paddr;
		bo_state[i].size = vc4_bo->base.base.size;
	}

	if (copy_to_user(u64_to_user_ptr(get_state->bo),
			 bo_state,
			 state->bo_count * sizeof(*bo_state)))
		ret = -EFAULT;

err_delete_handle:
	if (ret) {
		for (i = 0; i < state->bo_count; i++)
			drm_gem_handle_delete(file_priv, bo_state[i].handle);
	}

err_free:
	vc4_free_hang_state(dev, kernel_state);
	kfree(bo_state);

	return ret;
}

static void
vc4_save_hang_state(struct drm_device *dev)
{
	struct vc4_dev *vc4 = to_vc4_dev(dev);
	struct drm_vc4_get_hang_state *state;
	struct vc4_hang_state *kernel_state;
	struct vc4_exec_info *exec[2];
	struct vc4_bo *bo;
	unsigned long irqflags;
	unsigned int i, j, unref_list_count, prev_idx;

	kernel_state =