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// 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>
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 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_dma_fence *hl_fence =
container_of(fence, struct hl_dma_fence, base_fence);
return dev_name(hl_fence->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_dma_fence *hl_fence =
container_of(fence, struct hl_dma_fence, base_fence);
kfree_rcu(hl_fence, 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,
.wait = dma_fence_default_wait,
.release = hl_fence_release
};
static void cs_get(struct hl_cs *cs)
{
kref_get(&cs->refcount);
}
static int cs_get_unless_zero(struct hl_cs *cs)
{
return kref_get_unless_zero(&cs->refcount);
}
static void cs_put(struct hl_cs *cs)
{
kref_put(&cs->refcount, cs_do_release);
}
/*
* cs_parser - parse the user command submission
*
* @hpriv : pointer to the private data of the fd
* @job : pointer to the job that holds the command submission info
*
* The function parses the command submission of the user. It calls the
* ASIC specific parser, which returns a list of memory blocks to send
* to the device as different command buffers
*
*/
static int cs_parser(struct hl_fpriv *hpriv, struct hl_cs_job *job)
{
struct hl_device *hdev = hpriv->hdev;
struct hl_cs_parser parser;
int rc;
parser.ctx_id = job->cs->ctx->asid;
parser.cs_sequence = job->cs->sequence;
parser.job_id = job->id;
parser.hw_queue_id = job->hw_queue_id;
parser.job_userptr_list = &job->userptr_list;
parser.patched_cb = NULL;
parser.user_cb = job->user_cb;
parser.user_cb_size = job->user_cb_size;
parser.ext_queue = job->ext_queue;
job->patched_cb = NULL;
rc = hdev->asic_funcs->cs_parser(hdev, &parser);
if (job->ext_queue) {
if (!rc) {
job->patched_cb = parser.patched_cb;
job->job_cb_size = parser.patched_cb_size;
spin_lock(&job->patched_cb->lock);
job->patched_cb->cs_cnt++;
spin_unlock(&job->patched_cb->lock);
}
/*
* Whether the parsing worked or not, we don't need the
* original CB anymore because it was already parsed and
* won't be accessed again for this CS
*/
spin_lock(&job->user_cb->lock);
job->user_cb->cs_cnt--;
spin_unlock(&job->user_cb->lock);
hl_cb_put(job->user_cb);
job->user_cb = NULL;
}
return rc;
}
static void free_job(struct hl_device *hdev, struct hl_cs_job *job)
{
struct hl_cs *cs = job->cs;
if (job->ext_queue) {
hl_userptr_delete_list(hdev, &job->userptr_list);
/*
* We might arrive here from rollback and patched CB wasn't
* created, so we need to check it's not NULL
*/
if (job->patched_cb) {
spin_lock(&job->patched_cb->lock);
job->patched_cb->cs_cnt--;
spin_unlock(&job->patched_cb->lock);
hl_cb_put(job->patched_cb);
}
}
/*
* This is the only place where there can be multiple threads
* modifying the list at the same time
*/
spin_lock(&cs->job_lock);
list_del(&job->cs_node);
spin_unlock(&cs->job_lock);
hl_debugfs_remove_job(hdev, job);
if (job->ext_queue)
cs_put(cs);
kfree(job);
}
static void cs_do_release(struct kref *ref)
{
struct hl_cs *cs = container_of(ref, struct hl_cs,
refcount);
struct hl_device *hdev = cs->ctx->hdev;
struct hl_cs_job *job, *tmp;
cs->completed = true;
/*
* Although if we reached here it means that all external jobs have
* finished, because each one of them took refcnt to CS, we still
* need to go over the internal jobs and free them. Otherwise, we
* will have leaked memory and what's worse, the CS object (and
* potentially the CTX object) could be released, while the JOB
* still holds a pointer to them (but no reference).
*/
list_for_each_entry_safe(job, tmp, &cs->job_list, cs_node)
free_job(hdev, job);
/* We also need to update CI for internal queues */
if (cs->submitted) {
int cs_cnt = atomic_dec_return(&hdev->cs_active_cnt);
WARN_ONCE((cs_cnt < 0),
"hl%d: error in CS active cnt %d\n",
hdev->id, cs_cnt);
hl_int_hw_queue_update_ci(cs);
spin_lock(&hdev->hw_queues_mirror_lock);
/* remove CS from hw_queues mirror list */
list_del_init(&cs->mirror_node);
spin_unlock(&hdev->hw_queues_mirror_lock);
/*
* Don't cancel TDR in case this CS was timedout because we
* might be running from the TDR context
*/
if ((!cs->timedout) &&
(hdev->timeout_jiffies != MAX_SCHEDULE_TIMEOUT)) {
struct hl_cs *next;
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