// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2016-2019 HabanaLabs, Ltd.
* All Rights Reserved.
*/
#include <uapi/misc/habanalabs.h>
#include "habanalabs.h"
#include <linux/uaccess.h>
#include <linux/slab.h>
#define HL_CS_FLAGS_SIG_WAIT (HL_CS_FLAGS_SIGNAL | HL_CS_FLAGS_WAIT)
static void job_wq_completion(struct work_struct *work);
static long _hl_cs_wait_ioctl(struct hl_device *hdev,
struct hl_ctx *ctx, u64 timeout_us, u64 seq);
static void cs_do_release(struct kref *ref);
static void hl_sob_reset(struct kref *ref)
{
struct hl_hw_sob *hw_sob = container_of(ref, struct hl_hw_sob,
kref);
struct hl_device *hdev = hw_sob->hdev;
hdev->asic_funcs->reset_sob(hdev, hw_sob);
}
void hl_sob_reset_error(struct kref *ref)
{
struct hl_hw_sob *hw_sob = container_of(ref, struct hl_hw_sob,
kref);
struct hl_device *hdev = hw_sob->hdev;
dev_crit(hdev->dev,
"SOB release shouldn't be called here, q_idx: %d, sob_id: %d\n",
hw_sob->q_idx, hw_sob->sob_id);
}
static const char *hl_fence_get_driver_name(struct dma_fence *fence)
{
return "HabanaLabs";
}
static const char *hl_fence_get_timeline_name(struct dma_fence *fence)
{
struct hl_cs_compl *hl_cs_compl =
container_of(fence, struct hl_cs_compl, base_fence);
return dev_name(hl_cs_compl->hdev->dev);
}
static bool hl_fence_enable_signaling(struct dma_fence *fence)
{
return true;
}
static void hl_fence_release(struct dma_fence *fence)
{
struct hl_cs_compl *hl_cs_cmpl =
container_of(fence, struct hl_cs_compl, base_fence);
struct hl_device *hdev = hl_cs_cmpl->hdev;
/* EBUSY means the CS was never submitted and hence we don't have
* an attached hw_sob object that we should handle here
*/
if (fence->error == -EBUSY)
goto free;
if ((hl_cs_cmpl->type == CS_TYPE_SIGNAL) ||
(hl_cs_cmpl->type == CS_TYPE_WAIT)) {
dev_dbg(hdev->dev,
"CS 0x%llx type %d finished, sob_id: %d, sob_val: 0x%x\n",
hl_cs_cmpl->cs_seq,
hl_cs_cmpl->type,
hl_cs_cmpl->hw_sob->sob_id,
hl_cs_cmpl->sob_val);
/*
* A signal CS can get completion while the corresponding wait
* for signal CS is on its way to the PQ. The wait for signal CS
* will get stuck if the signal CS incremented the SOB to its
* max value and there are no pending (submitted) waits on this
* SOB.
* We do the following to void this situation:
* 1. The wait for signal CS must get a ref for the signal CS as
* soon as possible in cs_ioctl_signal_wait() and put it
* before being submitted to the PQ but after it incremented
* the SOB refcnt in init_signal_wait_cs().
* 2. Signal/Wait for signal CS will decrement the SOB refcnt
* here.
* These two measures guarantee that the wait for signal CS will
* reset the SOB upon completion rather than the signal CS and
* hence the above scenario is avoided.
*/
kref_put(&hl_cs_cmpl->hw_sob->kref, hl_sob_reset);
}
free:
kfree_rcu(hl_cs_cmpl, base_fence.rcu);
}
static const struct dma_fence_ops hl_fence_ops = {
.get_driver_name = hl_fence_get_driver_name,
.get_timeline_name = hl_fence_get_timeline_name,
.enable_signaling = hl_fence_enable_signaling,
.release = hl_fence_release
};
static void cs_get(struct hl_cs *cs)
{
kref_get(&cs