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Date: Wed, 20 Jul 2022 14:15:23 +0300
From: Oded Gabbay <ogabbay@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH 9/9] 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@...cle.com>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
drivers/misc/habanalabs/common/habanalabs.h | 4 ----
drivers/misc/habanalabs/gaudi/gaudi.c | 2 --
drivers/misc/habanalabs/gaudi2/gaudi2.c | 23 ---------------------
drivers/misc/habanalabs/gaudi2/gaudi2P.h | 3 ---
drivers/misc/habanalabs/goya/goya.c | 2 --
5 files changed, 34 deletions(-)
diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h
index d3efec600458..8d9e96c6092a 100644
--- a/drivers/misc/habanalabs/common/habanalabs.h
+++ b/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);
diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
index 20f62730be02..4d11efed3e64 100644
--- a/drivers/misc/habanalabs/gaudi/gaudi.c
+++ b/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,
diff --git a/drivers/misc/habanalabs/gaudi2/gaudi2.c b/drivers/misc/habanalabs/gaudi2/gaudi2.c
index 3531a339e742..2c43ed403509 100644
--- a/drivers/misc/habanalabs/gaudi2/gaudi2.c
+++ b/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,
diff --git a/drivers/misc/habanalabs/gaudi2/gaudi2P.h b/drivers/misc/habanalabs/gaudi2/gaudi2P.h
index 5110574a650e..347ea1dd78e2 100644
--- a/drivers/misc/habanalabs/gaudi2/gaudi2P.h
+++ b/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;
diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
index d4459c290ea8..91429d6ea037 100644
--- a/drivers/misc/habanalabs/goya/goya.c
+++ b/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,
--
2.25.1
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