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habanalabs: Modify the cs_cnt of a CB to be atomic

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Modify the CS counter of a CB to be atomic, so no locking is required
when it is being modified or read.

Signed-off-by: Tomer Tayar <ttayar@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
This commit is contained in:
Tomer Tayar 2020-08-02 22:51:31 +03:00 committed by Oded Gabbay
parent 3e438b42a5
commit f074867454
5 changed files with 17 additions and 32 deletions
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29
drivers/misc/habanalabs/common/command_submission.c
View File

@ -233,10 +233,7 @@ static int cs_parser(struct hl_fpriv *hpriv, struct hl_cs_job *job)
job->patched_cb = parser.patched_cb;
job->job_cb_size = parser.patched_cb_size;
job->contains_dma_pkt = parser.contains_dma_pkt;
spin_lock(&job->patched_cb->lock);
job->patched_cb->cs_cnt++;
spin_unlock(&job->patched_cb->lock);
atomic_inc(&job->patched_cb->cs_cnt);
}
/*
@ -244,9 +241,7 @@ static int cs_parser(struct hl_fpriv *hpriv, struct hl_cs_job *job)
* 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);
atomic_dec(&job->user_cb->cs_cnt);
hl_cb_put(job->user_cb);
job->user_cb = NULL;
} else if (!rc) {
@ -268,10 +263,7 @@ static void complete_job(struct hl_device *hdev, struct hl_cs_job *job)
* 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);
atomic_dec(&job->patched_cb->cs_cnt);
hl_cb_put(job->patched_cb);
}
}
@ -284,10 +276,7 @@ static void complete_job(struct hl_device *hdev, struct hl_cs_job *job)
if (job->is_kernel_allocated_cb &&
((job->queue_type == QUEUE_TYPE_HW && hdev->mmu_enable) ||
job->queue_type == QUEUE_TYPE_INT)) {
spin_lock(&job->user_cb->lock);
job->user_cb->cs_cnt--;
spin_unlock(&job->user_cb->lock);
atomic_dec(&job->user_cb->cs_cnt);
hl_cb_put(job->user_cb);
}
@ -680,9 +669,7 @@ static struct hl_cb *get_cb_from_cs_chunk(struct hl_device *hdev,
goto release_cb;
}
spin_lock(&cb->lock);
cb->cs_cnt++;
spin_unlock(&cb->lock);
atomic_inc(&cb->cs_cnt);
return cb;
@ -936,9 +923,7 @@ static int cs_ioctl_default(struct hl_fpriv *hpriv, void __user *chunks,
goto put_cs;
release_cb:
spin_lock(&cb->lock);
cb->cs_cnt--;
spin_unlock(&cb->lock);
atomic_dec(&cb->cs_cnt);
hl_cb_put(cb);
free_cs_object:
cs_rollback(hdev, cs);
@ -1133,7 +1118,7 @@ static int cs_ioctl_signal_wait_create_jobs(struct hl_device *hdev,
job->id = 0;
job->cs = cs;
job->user_cb = cb;
job->user_cb->cs_cnt++;
atomic_inc(&job->user_cb->cs_cnt);
job->user_cb_size = cb_size;
job->hw_queue_id = q_idx;

2
drivers/misc/habanalabs/common/debugfs.c
View File

@ -116,7 +116,7 @@ static int command_buffers_show(struct seq_file *s, void *data)
" %03llu %d 0x%08x %d %d %d\n",
cb->id, cb->ctx->asid, cb->size,
kref_read(&cb->refcount),
cb->mmap, cb->cs_cnt);
cb->mmap, atomic_read(&cb->cs_cnt));
}
spin_unlock(&dev_entry->cb_spinlock);

4
drivers/misc/habanalabs/common/habanalabs.h
View File

@ -532,7 +532,7 @@ struct hl_cb_mgr {
* @refcount: reference counter for usage of the CB.
* @hdev: pointer to device this CB belongs to.
* @ctx: pointer to the CB owner's context.
* @lock: spinlock to protect mmap/cs flows.
* @lock: spinlock to protect mmap flows.
* @debugfs_list: node in debugfs list of command buffers.
* @pool_list: node in pool list of command buffers.
* @va_block_list: list of virtual addresses blocks of the CB if it is mapped to
@ -561,7 +561,7 @@ struct hl_cb {
dma_addr_t bus_address;
u32 mmap_size;
u32 size;
u32 cs_cnt;
atomic_t cs_cnt;
u8 mmap;
u8 is_pool;
u8 is_internal;

10
drivers/misc/habanalabs/gaudi/gaudi.c
View File

@ -838,7 +838,7 @@ static int _gaudi_init_tpc_mem(struct hl_device *hdev,
job->id = 0;
job->user_cb = cb;
job->user_cb->cs_cnt++;
atomic_inc(&job->user_cb->cs_cnt);
job->user_cb_size = cb_size;
job->hw_queue_id = GAUDI_QUEUE_ID_DMA_0_0;
job->patched_cb = job->user_cb;
@ -861,7 +861,7 @@ free_job:
hl_userptr_delete_list(hdev, &job->userptr_list);
hl_debugfs_remove_job(hdev, job);
kfree(job);
cb->cs_cnt--;
atomic_dec(&cb->cs_cnt);
release_cb:
hl_cb_put(cb);
@ -1248,7 +1248,7 @@ static int gaudi_collective_wait_create_job(struct hl_device *hdev,
job->id = 0;
job->cs = cs;
job->user_cb = cb;
job->user_cb->cs_cnt++;
atomic_inc(&job->user_cb->cs_cnt);
job->user_cb_size = cb_size;
job->hw_queue_id = queue_id;
@ -5570,7 +5570,7 @@ static int gaudi_memset_device_memory(struct hl_device *hdev, u64 addr,
job->id = 0;
job->user_cb = cb;
job->user_cb->cs_cnt++;
atomic_inc(&job->user_cb->cs_cnt);
job->user_cb_size = cb_size;
job->hw_queue_id = GAUDI_QUEUE_ID_DMA_0_0;
job->patched_cb = job->user_cb;
@ -5581,7 +5581,7 @@ static int gaudi_memset_device_memory(struct hl_device *hdev, u64 addr,
rc = gaudi_send_job_on_qman0(hdev, job);
hl_debugfs_remove_job(hdev, job);
kfree(job);
cb->cs_cnt--;
atomic_dec(&cb->cs_cnt);
/* Verify DMA is OK */
err_cause = RREG32(mmDMA0_CORE_ERR_CAUSE);

4
drivers/misc/habanalabs/goya/goya.c
View File

@ -4811,7 +4811,7 @@ static int goya_memset_device_memory(struct hl_device *hdev, u64 addr, u64 size,
job->id = 0;
job->user_cb = cb;
job->user_cb->cs_cnt++;
atomic_inc(&job->user_cb->cs_cnt);
job->user_cb_size = cb_size;
job->hw_queue_id = GOYA_QUEUE_ID_DMA_0;
job->patched_cb = job->user_cb;
@ -4823,7 +4823,7 @@ static int goya_memset_device_memory(struct hl_device *hdev, u64 addr, u64 size,
hl_debugfs_remove_job(hdev, job);
kfree(job);
cb->cs_cnt--;
atomic_dec(&cb->cs_cnt);
release_cb:
hl_cb_put(cb);