Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1023 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
new file mode 100644
index 000000000..7f64c6667
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -0,0 +1,1023 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2013 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ */
+
+#include "drm/drm_drv.h"
+
+#include "msm_gpu.h"
+#include "msm_gem.h"
+#include "msm_mmu.h"
+#include "msm_fence.h"
+#include "msm_gpu_trace.h"
+#include "adreno/adreno_gpu.h"
+
+#include <generated/utsrelease.h>
+#include <linux/string_helpers.h>
+#include <linux/devcoredump.h>
+#include <linux/sched/task.h>
+
+/*
+ * Power Management:
+ */
+
+static int enable_pwrrail(struct msm_gpu *gpu)
+{
+	struct drm_device *dev = gpu->dev;
+	int ret = 0;
+
+	if (gpu->gpu_reg) {
+		ret = regulator_enable(gpu->gpu_reg);
+		if (ret) {
+			DRM_DEV_ERROR(dev->dev, "failed to enable 'gpu_reg': %d\n", ret);
+			return ret;
+		}
+	}
+
+	if (gpu->gpu_cx) {
+		ret = regulator_enable(gpu->gpu_cx);
+		if (ret) {
+			DRM_DEV_ERROR(dev->dev, "failed to enable 'gpu_cx': %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int disable_pwrrail(struct msm_gpu *gpu)
+{
+	if (gpu->gpu_cx)
+		regulator_disable(gpu->gpu_cx);
+	if (gpu->gpu_reg)
+		regulator_disable(gpu->gpu_reg);
+	return 0;
+}
+
+static int enable_clk(struct msm_gpu *gpu)
+{
+	if (gpu->core_clk && gpu->fast_rate)
+		dev_pm_opp_set_rate(&gpu->pdev->dev, gpu->fast_rate);
+
+	/* Set the RBBM timer rate to 19.2Mhz */
+	if (gpu->rbbmtimer_clk)
+		clk_set_rate(gpu->rbbmtimer_clk, 19200000);
+
+	return clk_bulk_prepare_enable(gpu->nr_clocks, gpu->grp_clks);
+}
+
+static int disable_clk(struct msm_gpu *gpu)
+{
+	clk_bulk_disable_unprepare(gpu->nr_clocks, gpu->grp_clks);
+
+	/*
+	 * Set the clock to a deliberately low rate. On older targets the clock
+	 * speed had to be non zero to avoid problems. On newer targets this
+	 * will be rounded down to zero anyway so it all works out.
+	 */
+	if (gpu->core_clk)
+		dev_pm_opp_set_rate(&gpu->pdev->dev, 27000000);
+
+	if (gpu->rbbmtimer_clk)
+		clk_set_rate(gpu->rbbmtimer_clk, 0);
+
+	return 0;
+}
+
+static int enable_axi(struct msm_gpu *gpu)
+{
+	return clk_prepare_enable(gpu->ebi1_clk);
+}
+
+static int disable_axi(struct msm_gpu *gpu)
+{
+	clk_disable_unprepare(gpu->ebi1_clk);
+	return 0;
+}
+
+int msm_gpu_pm_resume(struct msm_gpu *gpu)
+{
+	int ret;
+
+	DBG("%s", gpu->name);
+	trace_msm_gpu_resume(0);
+
+	ret = enable_pwrrail(gpu);
+	if (ret)
+		return ret;
+
+	ret = enable_clk(gpu);
+	if (ret)
+		return ret;
+
+	ret = enable_axi(gpu);
+	if (ret)
+		return ret;
+
+	msm_devfreq_resume(gpu);
+
+	gpu->needs_hw_init = true;
+
+	return 0;
+}
+
+int msm_gpu_pm_suspend(struct msm_gpu *gpu)
+{
+	int ret;
+
+	DBG("%s", gpu->name);
+	trace_msm_gpu_suspend(0);
+
+	msm_devfreq_suspend(gpu);
+
+	ret = disable_axi(gpu);
+	if (ret)
+		return ret;
+
+	ret = disable_clk(gpu);
+	if (ret)
+		return ret;
+
+	ret = disable_pwrrail(gpu);
+	if (ret)
+		return ret;
+
+	gpu->suspend_count++;
+
+	return 0;
+}
+
+void msm_gpu_show_fdinfo(struct msm_gpu *gpu, struct msm_file_private *ctx,
+			 struct drm_printer *p)
+{
+	drm_printf(p, "drm-engine-gpu:\t%llu ns\n", ctx->elapsed_ns);
+	drm_printf(p, "drm-cycles-gpu:\t%llu\n", ctx->cycles);
+	drm_printf(p, "drm-maxfreq-gpu:\t%u Hz\n", gpu->fast_rate);
+}
+
+int msm_gpu_hw_init(struct msm_gpu *gpu)
+{
+	int ret;
+
+	WARN_ON(!mutex_is_locked(&gpu->lock));
+
+	if (!gpu->needs_hw_init)
+		return 0;
+
+	disable_irq(gpu->irq);
+	ret = gpu->funcs->hw_init(gpu);
+	if (!ret)
+		gpu->needs_hw_init = false;
+	enable_irq(gpu->irq);
+
+	return ret;
+}
+
+#ifdef CONFIG_DEV_COREDUMP
+static ssize_t msm_gpu_devcoredump_read(char *buffer, loff_t offset,
+		size_t count, void *data, size_t datalen)
+{
+	struct msm_gpu *gpu = data;
+	struct drm_print_iterator iter;
+	struct drm_printer p;
+	struct msm_gpu_state *state;
+
+	state = msm_gpu_crashstate_get(gpu);
+	if (!state)
+		return 0;
+
+	iter.data = buffer;
+	iter.offset = 0;
+	iter.start = offset;
+	iter.remain = count;
+
+	p = drm_coredump_printer(&iter);
+
+	drm_printf(&p, "---\n");
+	drm_printf(&p, "kernel: " UTS_RELEASE "\n");
+	drm_printf(&p, "module: " KBUILD_MODNAME "\n");
+	drm_printf(&p, "time: %lld.%09ld\n",
+		state->time.tv_sec, state->time.tv_nsec);
+	if (state->comm)
+		drm_printf(&p, "comm: %s\n", state->comm);
+	if (state->cmd)
+		drm_printf(&p, "cmdline: %s\n", state->cmd);
+
+	gpu->funcs->show(gpu, state, &p);
+
+	msm_gpu_crashstate_put(gpu);
+
+	return count - iter.remain;
+}
+
+static void msm_gpu_devcoredump_free(void *data)
+{
+	struct msm_gpu *gpu = data;
+
+	msm_gpu_crashstate_put(gpu);
+}
+
+static void msm_gpu_crashstate_get_bo(struct msm_gpu_state *state,
+		struct drm_gem_object *obj, u64 iova, bool full)
+{
+	struct msm_gpu_state_bo *state_bo = &state->bos[state->nr_bos];
+
+	/* Don't record write only objects */
+	state_bo->size = obj->size;
+	state_bo->iova = iova;
+
+	BUILD_BUG_ON(sizeof(state_bo->name) != sizeof(to_msm_bo(obj)->name));
+
+	memcpy(state_bo->name, to_msm_bo(obj)->name, sizeof(state_bo->name));
+
+	if (full) {
+		void *ptr;
+
+		state_bo->data = kvmalloc(obj->size, GFP_KERNEL);
+		if (!state_bo->data)
+			goto out;
+
+		msm_gem_lock(obj);
+		ptr = msm_gem_get_vaddr_active(obj);
+		msm_gem_unlock(obj);
+		if (IS_ERR(ptr)) {
+			kvfree(state_bo->data);
+			state_bo->data = NULL;
+			goto out;
+		}
+
+		memcpy(state_bo->data, ptr, obj->size);
+		msm_gem_put_vaddr(obj);
+	}
+out:
+	state->nr_bos++;
+}
+
+static void msm_gpu_crashstate_capture(struct msm_gpu *gpu,
+		struct msm_gem_submit *submit, char *comm, char *cmd)
+{
+	struct msm_gpu_state *state;
+
+	/* Check if the target supports capturing crash state */
+	if (!gpu->funcs->gpu_state_get)
+		return;
+
+	/* Only save one crash state at a time */
+	if (gpu->crashstate)
+		return;
+
+	state = gpu->funcs->gpu_state_get(gpu);
+	if (IS_ERR_OR_NULL(state))
+		return;
+
+	/* Fill in the additional crash state information */
+	state->comm = kstrdup(comm, GFP_KERNEL);
+	state->cmd = kstrdup(cmd, GFP_KERNEL);
+	state->fault_info = gpu->fault_info;
+
+	if (submit) {
+		int i;
+
+		state->bos = kcalloc(submit->nr_bos,
+			sizeof(struct msm_gpu_state_bo), GFP_KERNEL);
+
+		for (i = 0; state->bos && i < submit->nr_bos; i++) {
+			msm_gpu_crashstate_get_bo(state, submit->bos[i].obj,
+						  submit->bos[i].iova,
+						  should_dump(submit, i));
+		}
+	}
+
+	/* Set the active crash state to be dumped on failure */
+	gpu->crashstate = state;
+
+	/* FIXME: Release the crashstate if this errors out? */
+	dev_coredumpm(gpu->dev->dev, THIS_MODULE, gpu, 0, GFP_KERNEL,
+		msm_gpu_devcoredump_read, msm_gpu_devcoredump_free);
+}
+#else
+static void msm_gpu_crashstate_capture(struct msm_gpu *gpu,
+		struct msm_gem_submit *submit, char *comm, char *cmd)
+{
+}
+#endif
+
+/*
+ * Hangcheck detection for locked gpu:
+ */
+
+static struct msm_gem_submit *
+find_submit(struct msm_ringbuffer *ring, uint32_t fence)
+{
+	struct msm_gem_submit *submit;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ring->submit_lock, flags);
+	list_for_each_entry(submit, &ring->submits, node) {
+		if (submit->seqno == fence) {
+			spin_unlock_irqrestore(&ring->submit_lock, flags);
+			return submit;
+		}
+	}
+	spin_unlock_irqrestore(&ring->submit_lock, flags);
+
+	return NULL;
+}
+
+static void retire_submits(struct msm_gpu *gpu);
+
+static void get_comm_cmdline(struct msm_gem_submit *submit, char **comm, char **cmd)
+{
+	struct msm_file_private *ctx = submit->queue->ctx;
+	struct task_struct *task;
+
+	WARN_ON(!mutex_is_locked(&submit->gpu->lock));
+
+	/* Note that kstrdup will return NULL if argument is NULL: */
+	*comm = kstrdup(ctx->comm, GFP_KERNEL);
+	*cmd  = kstrdup(ctx->cmdline, GFP_KERNEL);
+
+	task = get_pid_task(submit->pid, PIDTYPE_PID);
+	if (!task)
+		return;
+
+	if (!*comm)
+		*comm = kstrdup(task->comm, GFP_KERNEL);
+
+	if (!*cmd)
+		*cmd = kstrdup_quotable_cmdline(task, GFP_KERNEL);
+
+	put_task_struct(task);
+}
+
+static void recover_worker(struct kthread_work *work)
+{
+	struct msm_gpu *gpu = container_of(work, struct msm_gpu, recover_work);
+	struct drm_device *dev = gpu->dev;
+	struct msm_drm_private *priv = dev->dev_private;
+	struct msm_gem_submit *submit;
+	struct msm_ringbuffer *cur_ring = gpu->funcs->active_ring(gpu);
+	char *comm = NULL, *cmd = NULL;
+	int i;
+
+	mutex_lock(&gpu->lock);
+
+	DRM_DEV_ERROR(dev->dev, "%s: hangcheck recover!\n", gpu->name);
+
+	submit = find_submit(cur_ring, cur_ring->memptrs->fence + 1);
+	if (submit) {
+		/* Increment the fault counts */
+		submit->queue->faults++;
+		if (submit->aspace)
+			submit->aspace->faults++;
+
+		get_comm_cmdline(submit, &comm, &cmd);
+
+		if (comm && cmd) {
+			DRM_DEV_ERROR(dev->dev, "%s: offending task: %s (%s)\n",
+				gpu->name, comm, cmd);
+
+			msm_rd_dump_submit(priv->hangrd, submit,
+				"offending task: %s (%s)", comm, cmd);
+		} else {
+			msm_rd_dump_submit(priv->hangrd, submit, NULL);
+		}
+	} else {
+		/*
+		 * We couldn't attribute this fault to any particular context,
+		 * so increment the global fault count instead.
+		 */
+		gpu->global_faults++;
+	}
+
+	/* Record the crash state */
+	pm_runtime_get_sync(&gpu->pdev->dev);
+	msm_gpu_crashstate_capture(gpu, submit, comm, cmd);
+
+	kfree(cmd);
+	kfree(comm);
+
+	/*
+	 * Update all the rings with the latest and greatest fence.. this
+	 * needs to happen after msm_rd_dump_submit() to ensure that the
+	 * bo's referenced by the offending submit are still around.
+	 */
+	for (i = 0; i < gpu->nr_rings; i++) {
+		struct msm_ringbuffer *ring = gpu->rb[i];
+
+		uint32_t fence = ring->memptrs->fence;
+
+		/*
+		 * For the current (faulting?) ring/submit advance the fence by
+		 * one more to clear the faulting submit
+		 */
+		if (ring == cur_ring)
+			ring->memptrs->fence = ++fence;
+
+		msm_update_fence(ring->fctx, fence);
+	}
+
+	if (msm_gpu_active(gpu)) {
+		/* retire completed submits, plus the one that hung: */
+		retire_submits(gpu);
+
+		gpu->funcs->recover(gpu);
+
+		/*
+		 * Replay all remaining submits starting with highest priority
+		 * ring
+		 */
+		for (i = 0; i < gpu->nr_rings; i++) {
+			struct msm_ringbuffer *ring = gpu->rb[i];
+			unsigned long flags;
+
+			spin_lock_irqsave(&ring->submit_lock, flags);
+			list_for_each_entry(submit, &ring->submits, node)
+				gpu->funcs->submit(gpu, submit);
+			spin_unlock_irqrestore(&ring->submit_lock, flags);
+		}
+	}
+
+	pm_runtime_put(&gpu->pdev->dev);
+
+	mutex_unlock(&gpu->lock);
+
+	msm_gpu_retire(gpu);
+}
+
+static void fault_worker(struct kthread_work *work)
+{
+	struct msm_gpu *gpu = container_of(work, struct msm_gpu, fault_work);
+	struct msm_gem_submit *submit;
+	struct msm_ringbuffer *cur_ring = gpu->funcs->active_ring(gpu);
+	char *comm = NULL, *cmd = NULL;
+
+	mutex_lock(&gpu->lock);
+
+	submit = find_submit(cur_ring, cur_ring->memptrs->fence + 1);
+	if (submit && submit->fault_dumped)
+		goto resume_smmu;
+
+	if (submit) {
+		get_comm_cmdline(submit, &comm, &cmd);
+
+		/*
+		 * When we get GPU iova faults, we can get 1000s of them,
+		 * but we really only want to log the first one.
+		 */
+		submit->fault_dumped = true;
+	}
+
+	/* Record the crash state */
+	pm_runtime_get_sync(&gpu->pdev->dev);
+	msm_gpu_crashstate_capture(gpu, submit, comm, cmd);
+	pm_runtime_put_sync(&gpu->pdev->dev);
+
+	kfree(cmd);
+	kfree(comm);
+
+resume_smmu:
+	memset(&gpu->fault_info, 0, sizeof(gpu->fault_info));
+	gpu->aspace->mmu->funcs->resume_translation(gpu->aspace->mmu);
+
+	mutex_unlock(&gpu->lock);
+}
+
+static void hangcheck_timer_reset(struct msm_gpu *gpu)
+{
+	struct msm_drm_private *priv = gpu->dev->dev_private;
+	mod_timer(&gpu->hangcheck_timer,
+			round_jiffies_up(jiffies + msecs_to_jiffies(priv->hangcheck_period)));
+}
+
+static bool made_progress(struct msm_gpu *gpu, struct msm_ringbuffer *ring)
+{
+	if (ring->hangcheck_progress_retries >= DRM_MSM_HANGCHECK_PROGRESS_RETRIES)
+		return false;
+
+	if (!gpu->funcs->progress)
+		return false;
+
+	if (!gpu->funcs->progress(gpu, ring))
+		return false;
+
+	ring->hangcheck_progress_retries++;
+	return true;
+}
+
+static void hangcheck_handler(struct timer_list *t)
+{
+	struct msm_gpu *gpu = from_timer(gpu, t, hangcheck_timer);
+	struct drm_device *dev = gpu->dev;
+	struct msm_ringbuffer *ring = gpu->funcs->active_ring(gpu);
+	uint32_t fence = ring->memptrs->fence;
+
+	if (fence != ring->hangcheck_fence) {
+		/* some progress has been made.. ya! */
+		ring->hangcheck_fence = fence;
+		ring->hangcheck_progress_retries = 0;
+	} else if (fence_before(fence, ring->fctx->last_fence) &&
+			!made_progress(gpu, ring)) {
+		/* no progress and not done.. hung! */
+		ring->hangcheck_fence = fence;
+		ring->hangcheck_progress_retries = 0;
+		DRM_DEV_ERROR(dev->dev, "%s: hangcheck detected gpu lockup rb %d!\n",
+				gpu->name, ring->id);
+		DRM_DEV_ERROR(dev->dev, "%s:     completed fence: %u\n",
+				gpu->name, fence);
+		DRM_DEV_ERROR(dev->dev, "%s:     submitted fence: %u\n",
+				gpu->name, ring->fctx->last_fence);
+
+		kthread_queue_work(gpu->worker, &gpu->recover_work);
+	}
+
+	/* if still more pending work, reset the hangcheck timer: */
+	if (fence_after(ring->fctx->last_fence, ring->hangcheck_fence))
+		hangcheck_timer_reset(gpu);
+
+	/* workaround for missing irq: */
+	msm_gpu_retire(gpu);
+}
+
+/*
+ * Performance Counters:
+ */
+
+/* called under perf_lock */
+static int update_hw_cntrs(struct msm_gpu *gpu, uint32_t ncntrs, uint32_t *cntrs)
+{
+	uint32_t current_cntrs[ARRAY_SIZE(gpu->last_cntrs)];
+	int i, n = min(ncntrs, gpu->num_perfcntrs);
+
+	/* read current values: */
+	for (i = 0; i < gpu->num_perfcntrs; i++)
+		current_cntrs[i] = gpu_read(gpu, gpu->perfcntrs[i].sample_reg);
+
+	/* update cntrs: */
+	for (i = 0; i < n; i++)
+		cntrs[i] = current_cntrs[i] - gpu->last_cntrs[i];
+
+	/* save current values: */
+	for (i = 0; i < gpu->num_perfcntrs; i++)
+		gpu->last_cntrs[i] = current_cntrs[i];
+
+	return n;
+}
+
+static void update_sw_cntrs(struct msm_gpu *gpu)
+{
+	ktime_t time;
+	uint32_t elapsed;
+	unsigned long flags;
+
+	spin_lock_irqsave(&gpu->perf_lock, flags);
+	if (!gpu->perfcntr_active)
+		goto out;
+
+	time = ktime_get();
+	elapsed = ktime_to_us(ktime_sub(time, gpu->last_sample.time));
+
+	gpu->totaltime += elapsed;
+	if (gpu->last_sample.active)
+		gpu->activetime += elapsed;
+
+	gpu->last_sample.active = msm_gpu_active(gpu);
+	gpu->last_sample.time = time;
+
+out:
+	spin_unlock_irqrestore(&gpu->perf_lock, flags);
+}
+
+void msm_gpu_perfcntr_start(struct msm_gpu *gpu)
+{
+	unsigned long flags;
+
+	pm_runtime_get_sync(&gpu->pdev->dev);
+
+	spin_lock_irqsave(&gpu->perf_lock, flags);
+	/* we could dynamically enable/disable perfcntr registers too.. */
+	gpu->last_sample.active = msm_gpu_active(gpu);
+	gpu->last_sample.time = ktime_get();
+	gpu->activetime = gpu->totaltime = 0;
+	gpu->perfcntr_active = true;
+	update_hw_cntrs(gpu, 0, NULL);
+	spin_unlock_irqrestore(&gpu->perf_lock, flags);
+}
+
+void msm_gpu_perfcntr_stop(struct msm_gpu *gpu)
+{
+	gpu->perfcntr_active = false;
+	pm_runtime_put_sync(&gpu->pdev->dev);
+}
+
+/* returns -errno or # of cntrs sampled */
+int msm_gpu_perfcntr_sample(struct msm_gpu *gpu, uint32_t *activetime,
+		uint32_t *totaltime, uint32_t ncntrs, uint32_t *cntrs)
+{
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&gpu->perf_lock, flags);
+
+	if (!gpu->perfcntr_active) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	*activetime = gpu->activetime;
+	*totaltime = gpu->totaltime;
+
+	gpu->activetime = gpu->totaltime = 0;
+
+	ret = update_hw_cntrs(gpu, ncntrs, cntrs);
+
+out:
+	spin_unlock_irqrestore(&gpu->perf_lock, flags);
+
+	return ret;
+}
+
+/*
+ * Cmdstream submission/retirement:
+ */
+
+static void retire_submit(struct msm_gpu *gpu, struct msm_ringbuffer *ring,
+		struct msm_gem_submit *submit)
+{
+	int index = submit->seqno % MSM_GPU_SUBMIT_STATS_COUNT;
+	volatile struct msm_gpu_submit_stats *stats;
+	u64 elapsed, clock = 0, cycles;
+	unsigned long flags;
+
+	stats = &ring->memptrs->stats[index];
+	/* Convert 19.2Mhz alwayson ticks to nanoseconds for elapsed time */
+	elapsed = (stats->alwayson_end - stats->alwayson_start) * 10000;
+	do_div(elapsed, 192);
+
+	cycles = stats->cpcycles_end - stats->cpcycles_start;
+
+	/* Calculate the clock frequency from the number of CP cycles */
+	if (elapsed) {
+		clock = cycles * 1000;
+		do_div(clock, elapsed);
+	}
+
+	submit->queue->ctx->elapsed_ns += elapsed;
+	submit->queue->ctx->cycles     += cycles;
+
+	trace_msm_gpu_submit_retired(submit, elapsed, clock,
+		stats->alwayson_start, stats->alwayson_end);
+
+	msm_submit_retire(submit);
+
+	pm_runtime_mark_last_busy(&gpu->pdev->dev);
+
+	spin_lock_irqsave(&ring->submit_lock, flags);
+	list_del(&submit->node);
+	spin_unlock_irqrestore(&ring->submit_lock, flags);
+
+	/* Update devfreq on transition from active->idle: */
+	mutex_lock(&gpu->active_lock);
+	gpu->active_submits--;
+	WARN_ON(gpu->active_submits < 0);
+	if (!gpu->active_submits) {
+		msm_devfreq_idle(gpu);
+		pm_runtime_put_autosuspend(&gpu->pdev->dev);
+	}
+
+	mutex_unlock(&gpu->active_lock);
+
+	msm_gem_submit_put(submit);
+}
+
+static void retire_submits(struct msm_gpu *gpu)
+{
+	int i;
+
+	/* Retire the commits starting with highest priority */
+	for (i = 0; i < gpu->nr_rings; i++) {
+		struct msm_ringbuffer *ring = gpu->rb[i];
+
+		while (true) {
+			struct msm_gem_submit *submit = NULL;
+			unsigned long flags;
+
+			spin_lock_irqsave(&ring->submit_lock, flags);
+			submit = list_first_entry_or_null(&ring->submits,
+					struct msm_gem_submit, node);
+			spin_unlock_irqrestore(&ring->submit_lock, flags);
+
+			/*
+			 * If no submit, we are done.  If submit->fence hasn't
+			 * been signalled, then later submits are not signalled
+			 * either, so we are also done.
+			 */
+			if (submit && dma_fence_is_signaled(submit->hw_fence)) {
+				retire_submit(gpu, ring, submit);
+			} else {
+				break;
+			}
+		}
+	}
+
+	wake_up_all(&gpu->retire_event);
+}
+
+static void retire_worker(struct kthread_work *work)
+{
+	struct msm_gpu *gpu = container_of(work, struct msm_gpu, retire_work);
+
+	retire_submits(gpu);
+}
+
+/* call from irq handler to schedule work to retire bo's */
+void msm_gpu_retire(struct msm_gpu *gpu)
+{
+	int i;
+
+	for (i = 0; i < gpu->nr_rings; i++)
+		msm_update_fence(gpu->rb[i]->fctx, gpu->rb[i]->memptrs->fence);
+
+	kthread_queue_work(gpu->worker, &gpu->retire_work);
+	update_sw_cntrs(gpu);
+}
+
+/* add bo's to gpu's ring, and kick gpu: */
+void msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit)
+{
+	struct msm_ringbuffer *ring = submit->ring;
+	unsigned long flags;
+
+	pm_runtime_get_sync(&gpu->pdev->dev);
+
+	mutex_lock(&gpu->lock);
+
+	msm_gpu_hw_init(gpu);
+
+	update_sw_cntrs(gpu);
+
+	/*
+	 * ring->submits holds a ref to the submit, to deal with the case
+	 * that a submit completes before msm_ioctl_gem_submit() returns.
+	 */
+	msm_gem_submit_get(submit);
+
+	spin_lock_irqsave(&ring->submit_lock, flags);
+	list_add_tail(&submit->node, &ring->submits);
+	spin_unlock_irqrestore(&ring->submit_lock, flags);
+
+	/* Update devfreq on transition from idle->active: */
+	mutex_lock(&gpu->active_lock);
+	if (!gpu->active_submits) {
+		pm_runtime_get(&gpu->pdev->dev);
+		msm_devfreq_active(gpu);
+	}
+	gpu->active_submits++;
+	mutex_unlock(&gpu->active_lock);
+
+	gpu->funcs->submit(gpu, submit);
+	gpu->cur_ctx_seqno = submit->queue->ctx->seqno;
+
+	hangcheck_timer_reset(gpu);
+
+	mutex_unlock(&gpu->lock);
+
+	pm_runtime_put(&gpu->pdev->dev);
+}
+
+/*
+ * Init/Cleanup:
+ */
+
+static irqreturn_t irq_handler(int irq, void *data)
+{
+	struct msm_gpu *gpu = data;
+	return gpu->funcs->irq(gpu);
+}
+
+static int get_clocks(struct platform_device *pdev, struct msm_gpu *gpu)
+{
+	int ret = devm_clk_bulk_get_all(&pdev->dev, &gpu->grp_clks);
+
+	if (ret < 1) {
+		gpu->nr_clocks = 0;
+		return ret;
+	}
+
+	gpu->nr_clocks = ret;
+
+	gpu->core_clk = msm_clk_bulk_get_clock(gpu->grp_clks,
+		gpu->nr_clocks, "core");
+
+	gpu->rbbmtimer_clk = msm_clk_bulk_get_clock(gpu->grp_clks,
+		gpu->nr_clocks, "rbbmtimer");
+
+	return 0;
+}
+
+/* Return a new address space for a msm_drm_private instance */
+struct msm_gem_address_space *
+msm_gpu_create_private_address_space(struct msm_gpu *gpu, struct task_struct *task)
+{
+	struct msm_gem_address_space *aspace = NULL;
+	if (!gpu)
+		return NULL;
+
+	/*
+	 * If the target doesn't support private address spaces then return
+	 * the global one
+	 */
+	if (gpu->funcs->create_private_address_space) {
+		aspace = gpu->funcs->create_private_address_space(gpu);
+		if (!IS_ERR(aspace))
+			aspace->pid = get_pid(task_pid(task));
+	}
+
+	if (IS_ERR_OR_NULL(aspace))
+		aspace = msm_gem_address_space_get(gpu->aspace);
+
+	return aspace;
+}
+
+int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
+		struct msm_gpu *gpu, const struct msm_gpu_funcs *funcs,
+		const char *name, struct msm_gpu_config *config)
+{
+	struct msm_drm_private *priv = drm->dev_private;
+	int i, ret, nr_rings = config->nr_rings;
+	void *memptrs;
+	uint64_t memptrs_iova;
+
+	if (WARN_ON(gpu->num_perfcntrs > ARRAY_SIZE(gpu->last_cntrs)))
+		gpu->num_perfcntrs = ARRAY_SIZE(gpu->last_cntrs);
+
+	gpu->dev = drm;
+	gpu->funcs = funcs;
+	gpu->name = name;
+
+	gpu->worker = kthread_create_worker(0, "gpu-worker");
+	if (IS_ERR(gpu->worker)) {
+		ret = PTR_ERR(gpu->worker);
+		gpu->worker = NULL;
+		goto fail;
+	}
+
+	sched_set_fifo_low(gpu->worker->task);
+
+	mutex_init(&gpu->active_lock);
+	mutex_init(&gpu->lock);
+	init_waitqueue_head(&gpu->retire_event);
+	kthread_init_work(&gpu->retire_work, retire_worker);
+	kthread_init_work(&gpu->recover_work, recover_worker);
+	kthread_init_work(&gpu->fault_work, fault_worker);
+
+	priv->hangcheck_period = DRM_MSM_HANGCHECK_DEFAULT_PERIOD;
+
+	/*
+	 * If progress detection is supported, halve the hangcheck timer
+	 * duration, as it takes two iterations of the hangcheck handler
+	 * to detect a hang.
+	 */
+	if (funcs->progress)
+		priv->hangcheck_period /= 2;
+
+	timer_setup(&gpu->hangcheck_timer, hangcheck_handler, 0);
+
+	spin_lock_init(&gpu->perf_lock);
+
+
+	/* Map registers: */
+	gpu->mmio = msm_ioremap(pdev, config->ioname);
+	if (IS_ERR(gpu->mmio)) {
+		ret = PTR_ERR(gpu->mmio);
+		goto fail;
+	}
+
+	/* Get Interrupt: */
+	gpu->irq = platform_get_irq(pdev, 0);
+	if (gpu->irq < 0) {
+		ret = gpu->irq;
+		goto fail;
+	}
+
+	ret = devm_request_irq(&pdev->dev, gpu->irq, irq_handler,
+			IRQF_TRIGGER_HIGH, "gpu-irq", gpu);
+	if (ret) {
+		DRM_DEV_ERROR(drm->dev, "failed to request IRQ%u: %d\n", gpu->irq, ret);
+		goto fail;
+	}
+
+	ret = get_clocks(pdev, gpu);
+	if (ret)
+		goto fail;
+
+	gpu->ebi1_clk = msm_clk_get(pdev, "bus");
+	DBG("ebi1_clk: %p", gpu->ebi1_clk);
+	if (IS_ERR(gpu->ebi1_clk))
+		gpu->ebi1_clk = NULL;
+
+	/* Acquire regulators: */
+	gpu->gpu_reg = devm_regulator_get(&pdev->dev, "vdd");
+	DBG("gpu_reg: %p", gpu->gpu_reg);
+	if (IS_ERR(gpu->gpu_reg))
+		gpu->gpu_reg = NULL;
+
+	gpu->gpu_cx = devm_regulator_get(&pdev->dev, "vddcx");
+	DBG("gpu_cx: %p", gpu->gpu_cx);
+	if (IS_ERR(gpu->gpu_cx))
+		gpu->gpu_cx = NULL;
+
+	gpu->pdev = pdev;
+	platform_set_drvdata(pdev, &gpu->adreno_smmu);
+
+	msm_devfreq_init(gpu);
+
+
+	gpu->aspace = gpu->funcs->create_address_space(gpu, pdev);
+
+	if (gpu->aspace == NULL)
+		DRM_DEV_INFO(drm->dev, "%s: no IOMMU, fallback to VRAM carveout!\n", name);
+	else if (IS_ERR(gpu->aspace)) {
+		ret = PTR_ERR(gpu->aspace);
+		goto fail;
+	}
+
+	memptrs = msm_gem_kernel_new(drm,
+		sizeof(struct msm_rbmemptrs) * nr_rings,
+		check_apriv(gpu, MSM_BO_WC), gpu->aspace, &gpu->memptrs_bo,
+		&memptrs_iova);
+
+	if (IS_ERR(memptrs)) {
+		ret = PTR_ERR(memptrs);
+		DRM_DEV_ERROR(drm->dev, "could not allocate memptrs: %d\n", ret);
+		goto fail;
+	}
+
+	msm_gem_object_set_name(gpu->memptrs_bo, "memptrs");
+
+	if (nr_rings > ARRAY_SIZE(gpu->rb)) {
+		DRM_DEV_INFO_ONCE(drm->dev, "Only creating %zu ringbuffers\n",
+			ARRAY_SIZE(gpu->rb));
+		nr_rings = ARRAY_SIZE(gpu->rb);
+	}
+
+	/* Create ringbuffer(s): */
+	for (i = 0; i < nr_rings; i++) {
+		gpu->rb[i] = msm_ringbuffer_new(gpu, i, memptrs, memptrs_iova);
+
+		if (IS_ERR(gpu->rb[i])) {
+			ret = PTR_ERR(gpu->rb[i]);
+			DRM_DEV_ERROR(drm->dev,
+				"could not create ringbuffer %d: %d\n", i, ret);
+			goto fail;
+		}
+
+		memptrs += sizeof(struct msm_rbmemptrs);
+		memptrs_iova += sizeof(struct msm_rbmemptrs);
+	}
+
+	gpu->nr_rings = nr_rings;
+
+	refcount_set(&gpu->sysprof_active, 1);
+
+	return 0;
+
+fail:
+	for (i = 0; i < ARRAY_SIZE(gpu->rb); i++)  {
+		msm_ringbuffer_destroy(gpu->rb[i]);
+		gpu->rb[i] = NULL;
+	}
+
+	msm_gem_kernel_put(gpu->memptrs_bo, gpu->aspace);
+
+	platform_set_drvdata(pdev, NULL);
+	return ret;
+}
+
+void msm_gpu_cleanup(struct msm_gpu *gpu)
+{
+	int i;
+
+	DBG("%s", gpu->name);
+
+	for (i = 0; i < ARRAY_SIZE(gpu->rb); i++) {
+		msm_ringbuffer_destroy(gpu->rb[i]);
+		gpu->rb[i] = NULL;
+	}
+
+	msm_gem_kernel_put(gpu->memptrs_bo, gpu->aspace);
+
+	if (!IS_ERR_OR_NULL(gpu->aspace)) {
+		gpu->aspace->mmu->funcs->detach(gpu->aspace->mmu);
+		msm_gem_address_space_put(gpu->aspace);
+	}
+
+	if (gpu->worker) {
+		kthread_destroy_worker(gpu->worker);
+	}
+
+	msm_devfreq_cleanup(gpu);
+
+	platform_set_drvdata(gpu->pdev, NULL);
+}