habanalabs: remove all kdma locks

We don't use KDMA concurrently in the driver. The only use is through
debugfs and we don't protect concurrent access through it.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

drivers/misc/habanalabs/common/habanalabs.h

@@ -1452,8 +1452,6 @@ struct engines_data {
  * @compute_reset_late_init: perform certain actions needed after a compute reset
  * @hw_queues_lock: acquire H/W queues lock.
  * @hw_queues_unlock: release H/W queues lock.
- * @kdma_lock: acquire H/W queues lock. Relevant from GRECO ASIC
- * @kdma_unlock: release H/W queues lock. Relevant from GRECO ASIC
  * @get_pci_id: retrieve PCI ID.
  * @get_eeprom_data: retrieve EEPROM data from F/W.
  * @get_monitor_dump: retrieve monitor registers dump from F/W.
@@ -1590,8 +1588,6 @@ struct hl_asic_funcs {
 	int (*compute_reset_late_init)(struct hl_device *hdev);
 	void (*hw_queues_lock)(struct hl_device *hdev);
 	void (*hw_queues_unlock)(struct hl_device *hdev);
-	void (*kdma_lock)(struct hl_device *hdev, int dcore_id);
-	void (*kdma_unlock)(struct hl_device *hdev, int dcore_id);
 	u32 (*get_pci_id)(struct hl_device *hdev);
 	int (*get_eeprom_data)(struct hl_device *hdev, void *data, size_t max_size);
 	int (*get_monitor_dump)(struct hl_device *hdev, void *data);

drivers/misc/habanalabs/gaudi/gaudi.c

@@ -9196,8 +9196,6 @@ static const struct hl_asic_funcs gaudi_funcs = {
 	.compute_reset_late_init = gaudi_compute_reset_late_init,
 	.hw_queues_lock = gaudi_hw_queues_lock,
 	.hw_queues_unlock = gaudi_hw_queues_unlock,
-	.kdma_lock = NULL,
-	.kdma_unlock = NULL,
 	.get_pci_id = gaudi_get_pci_id,
 	.get_eeprom_data = gaudi_get_eeprom_data,
 	.get_monitor_dump = gaudi_get_monitor_dump,

drivers/misc/habanalabs/gaudi2/gaudi2.c

@@ -3010,7 +3010,6 @@ static int gaudi2_sw_init(struct hl_device *hdev)
 	}
 
 	spin_lock_init(&gaudi2->hw_queues_lock);
-	spin_lock_init(&gaudi2->kdma_lock);
 
 	gaudi2->scratchpad_kernel_address = hl_asic_dma_alloc_coherent(hdev, PAGE_SIZE,
 							&gaudi2->scratchpad_bus_address,
@@ -6464,22 +6463,6 @@ static void gaudi2_hw_queues_unlock(struct hl_device *hdev)
 	spin_unlock(&gaudi2->hw_queues_lock);
 }
 
-static void gaudi2_kdma_lock(struct hl_device *hdev, int dcore_id)
-	__acquires(&gaudi2->kdma_lock)
-{
-	struct gaudi2_device *gaudi2 = hdev->asic_specific;
-
-	spin_lock(&gaudi2->kdma_lock);
-}
-
-static void gaudi2_kdma_unlock(struct hl_device *hdev, int dcore_id)
-	__releases(&gaudi2->kdma_lock)
-{
-	struct gaudi2_device *gaudi2 = hdev->asic_specific;
-
-	spin_unlock(&gaudi2->kdma_lock);
-}
-
 static u32 gaudi2_get_pci_id(struct hl_device *hdev)
 {
 	return hdev->pdev->device;
@@ -9122,8 +9105,6 @@ static int gaudi2_debugfs_read_dma(struct hl_device *hdev, u64 addr, u32 size, v
 		goto unreserve_va;
 	}
 
-	hdev->asic_funcs->kdma_lock(hdev, 0);
-
 	/* Enable MMU on KDMA */
 	gaudi2_kdma_set_mmbp_asid(hdev, false, ctx->asid);
 
@@ -9151,8 +9132,6 @@ static int gaudi2_debugfs_read_dma(struct hl_device *hdev, u64 addr, u32 size, v
 
 	gaudi2_kdma_set_mmbp_asid(hdev, true, HL_KERNEL_ASID_ID);
 
-	hdev->asic_funcs->kdma_unlock(hdev, 0);
-
 	mutex_lock(&ctx->mmu_lock);
 	hl_mmu_unmap_contiguous(ctx, reserved_va_base, SZ_2M);
 	hl_mmu_invalidate_cache_range(hdev, false, MMU_OP_USERPTR,
@@ -9951,8 +9930,6 @@ static const struct hl_asic_funcs gaudi2_funcs = {
 	.compute_reset_late_init = gaudi2_compute_reset_late_init,
 	.hw_queues_lock = gaudi2_hw_queues_lock,
 	.hw_queues_unlock = gaudi2_hw_queues_unlock,
-	.kdma_lock = gaudi2_kdma_lock,
-	.kdma_unlock = gaudi2_kdma_unlock,
 	.get_pci_id = gaudi2_get_pci_id,
 	.get_eeprom_data = gaudi2_get_eeprom_data,
 	.get_monitor_dump = gaudi2_get_monitor_dump,

drivers/misc/habanalabs/gaudi2/gaudi2P.h

@@ -457,7 +457,6 @@ struct dup_block_ctx {
  *                 the user can map.
  * @lfsr_rand_seeds: array of MME ACC random seeds to set.
  * @hw_queues_lock: protects the H/W queues from concurrent access.
- * @kdma_lock: protects the KDMA engine from concurrent access.
  * @scratchpad_kernel_address: general purpose PAGE_SIZE contiguous memory,
  *                             this memory region should be write-only.
  *                             currently used for HBW QMAN writes which is
@@ -509,7 +508,6 @@ struct dup_block_ctx {
  * @flush_db_fifo: flag to force flush DB FIFO after a write.
  * @hbm_cfg: HBM subsystem settings
  * @hw_queues_lock_mutex: used by simulator instead of hw_queues_lock.
- * @kdma_lock_mutex: used by simulator instead of kdma_lock.
  */
 struct gaudi2_device {
 	int (*cpucp_info_get)(struct hl_device *hdev);
@@ -518,7 +516,6 @@ struct gaudi2_device {
 	int				lfsr_rand_seeds[MME_NUM_OF_LFSR_SEEDS];
 
 	spinlock_t			hw_queues_lock;
-	spinlock_t			kdma_lock;
 
 	void				*scratchpad_kernel_address;
 	dma_addr_t			scratchpad_bus_address;

drivers/misc/habanalabs/goya/goya.c

@@ -5481,8 +5481,6 @@ static const struct hl_asic_funcs goya_funcs = {
 	.compute_reset_late_init = goya_compute_reset_late_init,
 	.hw_queues_lock = goya_hw_queues_lock,
 	.hw_queues_unlock = goya_hw_queues_unlock,
-	.kdma_lock = NULL,
-	.kdma_unlock = NULL,
 	.get_pci_id = goya_get_pci_id,
 	.get_eeprom_data = goya_get_eeprom_data,
 	.get_monitor_dump = goya_get_monitor_dump,