[PATCH 05/30] habanalabs: remove ASIC functions of clock gating

From: Oded Gabbay
Date: Sat Jan 22 2022 - 14:57:54 EST

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Now that clock gating is permanently disabled in GAUDI, no need for
the ASIC functions of setting and disabling clock gating, as this
was a unique scenario in GAUDI.

Signed-off-by: Oded Gabbay <ogabbay@xxxxxxxxxx>
---
drivers/misc/habanalabs/common/device.c | 4 -
drivers/misc/habanalabs/common/habanalabs.h | 5 -
drivers/misc/habanalabs/gaudi/gaudi.c | 123 +-------------------
drivers/misc/habanalabs/gaudi/gaudiP.h | 3 -
drivers/misc/habanalabs/goya/goya.c | 12 --
5 files changed, 5 insertions(+), 142 deletions(-)

diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c
index 733338ab6f1d..9955e0d3502b 100644
--- a/drivers/misc/habanalabs/common/device.c
+++ b/drivers/misc/habanalabs/common/device.c
@@ -644,9 +644,6 @@ int hl_device_set_debug_mode(struct hl_device *hdev, struct hl_ctx *ctx, bool en

hdev->in_debug = 0;

- if (!hdev->reset_info.hard_reset_pending)
- hdev->asic_funcs->set_clock_gating(hdev);
-
goto out;
}

@@ -657,7 +654,6 @@ int hl_device_set_debug_mode(struct hl_device *hdev, struct hl_ctx *ctx, bool en
goto out;
}

- hdev->asic_funcs->disable_clock_gating(hdev);
hdev->in_debug = 1;

out:
diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h
index 27b9f24c4f75..24962807e2cf 100644
--- a/drivers/misc/habanalabs/common/habanalabs.h
+++ b/drivers/misc/habanalabs/common/habanalabs.h
@@ -1164,9 +1164,6 @@ struct fw_load_mgr {
* @mmu_invalidate_cache_range: flush specific MMU STLB cache lines with
* ASID-VA-size mask.
* @send_heartbeat: send is-alive packet to CPU-CP and verify response.
- * @set_clock_gating: enable/disable clock gating per engine according to
- * clock gating mask in hdev
- * @disable_clock_gating: disable clock gating completely
* @debug_coresight: perform certain actions on Coresight for debugging.
* @is_device_idle: return true if device is idle, false otherwise.
* @non_hard_reset_late_init: perform certain actions needed after a reset which is not hard-reset
@@ -1300,8 +1297,6 @@ struct hl_asic_funcs {
int (*mmu_invalidate_cache_range)(struct hl_device *hdev, bool is_hard,
u32 flags, u32 asid, u64 va, u64 size);
int (*send_heartbeat)(struct hl_device *hdev);
- void (*set_clock_gating)(struct hl_device *hdev);
- void (*disable_clock_gating)(struct hl_device *hdev);
int (*debug_coresight)(struct hl_device *hdev, struct hl_ctx *ctx, void *data);
bool (*is_device_idle)(struct hl_device *hdev, u64 *mask_arr,
u8 mask_len, struct seq_file *s);
diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
index c20b781d4ada..16637d629e67 100644
--- a/drivers/misc/habanalabs/gaudi/gaudi.c
+++ b/drivers/misc/habanalabs/gaudi/gaudi.c
@@ -1,7 +1,7 @@
// SPDX-License-Identifier: GPL-2.0

/*
- * Copyright 2016-2021 HabanaLabs, Ltd.
+ * Copyright 2016-2022 HabanaLabs, Ltd.
* All Rights Reserved.
*/

@@ -458,7 +458,6 @@ struct ecc_info_extract_params {
u64 block_address;
u32 num_memories;
bool derr;
- bool disable_clock_gating;
};

static int gaudi_mmu_update_asid_hop0_addr(struct hl_device *hdev, u32 asid,
@@ -1896,7 +1895,6 @@ static int gaudi_sw_init(struct hl_device *hdev)
goto free_cpu_accessible_dma_pool;

spin_lock_init(&gaudi->hw_queues_lock);
- mutex_init(&gaudi->clk_gate_mutex);

hdev->supports_sync_stream = true;
hdev->supports_coresight = true;
@@ -1946,8 +1944,6 @@ static int gaudi_sw_fini(struct hl_device *hdev)

dma_pool_destroy(hdev->dma_pool);

- mutex_destroy(&gaudi->clk_gate_mutex);
-
kfree(gaudi);

return 0;
@@ -3738,10 +3734,6 @@ static void gaudi_tpc_stall(struct hl_device *hdev)
WREG32(mmTPC7_CFG_TPC_STALL, 1 << TPC0_CFG_TPC_STALL_V_SHIFT);
}

-static void gaudi_set_clock_gating(struct hl_device *hdev)
-{
-}
-
static void gaudi_disable_clock_gating(struct hl_device *hdev)
{
u32 qman_offset;
@@ -3810,8 +3802,6 @@ static void gaudi_halt_engines(struct hl_device *hdev, bool hard_reset, bool fw_
gaudi_stop_hbm_dma_qmans(hdev);
gaudi_stop_pci_dma_qmans(hdev);

- hdev->asic_funcs->disable_clock_gating(hdev);
-
msleep(wait_timeout_ms);

gaudi_pci_dma_stall(hdev);
@@ -4137,10 +4127,8 @@ static int gaudi_hw_init(struct hl_device *hdev)

/* In case the clock gating was enabled in preboot we need to disable
* it here before touching the MME/TPC registers.
- * There is no need to take clk gating mutex because when this function
- * runs, no other relevant code can run
*/
- hdev->asic_funcs->disable_clock_gating(hdev);
+ gaudi_disable_clock_gating(hdev);

/* SRAM scrambler must be initialized after CPU is running from HBM */
gaudi_init_scrambler_sram(hdev);
@@ -4166,8 +4154,6 @@ static int gaudi_hw_init(struct hl_device *hdev)

gaudi_init_nic_qmans(hdev);

- hdev->asic_funcs->set_clock_gating(hdev);
-
gaudi_enable_timestamp(hdev);

/* MSI must be enabled before CPU queues and NIC are initialized */
@@ -4815,7 +4801,6 @@ static int gaudi_hbm_scrubbing(struct hl_device *hdev)
static int gaudi_scrub_device_mem(struct hl_device *hdev, u64 addr, u64 size)
{
struct asic_fixed_properties *prop = &hdev->asic_prop;
- struct gaudi_device *gaudi = hdev->asic_specific;
int rc = 0;
u64 val = 0;

@@ -4850,17 +4835,11 @@ static int gaudi_scrub_device_mem(struct hl_device *hdev, u64 addr, u64 size)
return rc;
}

- mutex_lock(&gaudi->clk_gate_mutex);
- hdev->asic_funcs->disable_clock_gating(hdev);
-
/* Scrub HBM using all DMA channels in parallel */
rc = gaudi_hbm_scrubbing(hdev);
if (rc)
dev_err(hdev->dev,
"Failed to clear HBM in mem scrub all\n");
-
- hdev->asic_funcs->set_clock_gating(hdev);
- mutex_unlock(&gaudi->clk_gate_mutex);
}

return rc;
@@ -6344,7 +6323,6 @@ static int gaudi_debugfs_read_dma(struct hl_device *hdev, u64 addr, u32 size,
void *blob_addr)
{
u32 dma_core_sts0, err_cause, cfg1, size_left, pos, size_to_dma;
- struct gaudi_device *gaudi = hdev->asic_specific;
u32 qm_glbl_sts0, qm_cgm_sts;
u64 dma_offset, qm_offset;
dma_addr_t dma_addr;
@@ -6360,10 +6338,6 @@ static int gaudi_debugfs_read_dma(struct hl_device *hdev, u64 addr, u32 size,
if (!kernel_addr)
return -ENOMEM;

- mutex_lock(&gaudi->clk_gate_mutex);
-
- hdev->asic_funcs->disable_clock_gating(hdev);
-
hdev->asic_funcs->hw_queues_lock(hdev);

dma_id = gaudi_dma_assignment[GAUDI_PCI_DMA_1];
@@ -6448,10 +6422,6 @@ static int gaudi_debugfs_read_dma(struct hl_device *hdev, u64 addr, u32 size,
out:
hdev->asic_funcs->hw_queues_unlock(hdev);

- hdev->asic_funcs->set_clock_gating(hdev);
-
- mutex_unlock(&gaudi->clk_gate_mutex);
-
hdev->asic_funcs->asic_dma_free_coherent(hdev, SZ_2M, kernel_addr,
dma_addr);

@@ -6499,10 +6469,6 @@ static void gaudi_mmu_prepare(struct hl_device *hdev, u32 asid)
return;
}

- mutex_lock(&gaudi->clk_gate_mutex);
-
- hdev->asic_funcs->disable_clock_gating(hdev);
-
gaudi_mmu_prepare_reg(hdev, mmDMA0_QM_GLBL_NON_SECURE_PROPS_0, asid);
gaudi_mmu_prepare_reg(hdev, mmDMA0_QM_GLBL_NON_SECURE_PROPS_1, asid);
gaudi_mmu_prepare_reg(hdev, mmDMA0_QM_GLBL_NON_SECURE_PROPS_2, asid);
@@ -6780,10 +6746,6 @@ static void gaudi_mmu_prepare(struct hl_device *hdev, u32 asid)

gaudi_mmu_prepare_reg(hdev, mmPSOC_GLOBAL_CONF_TRACE_ARUSER, asid);
gaudi_mmu_prepare_reg(hdev, mmPSOC_GLOBAL_CONF_TRACE_AWUSER, asid);
-
- hdev->asic_funcs->set_clock_gating(hdev);
-
- mutex_unlock(&gaudi->clk_gate_mutex);
}

static int gaudi_send_job_on_qman0(struct hl_device *hdev,
@@ -7164,10 +7126,8 @@ static int gaudi_extract_ecc_info(struct hl_device *hdev,
struct ecc_info_extract_params *params, u64 *ecc_address,
u64 *ecc_syndrom, u8 *memory_wrapper_idx)
{
- struct gaudi_device *gaudi = hdev->asic_specific;
u32 i, num_mem_regs, reg, err_bit;
u64 err_addr, err_word = 0;
- int rc = 0;

num_mem_regs = params->num_memories / 32 +
((params->num_memories % 32) ? 1 : 0);
@@ -7180,11 +7140,6 @@ static int gaudi_extract_ecc_info(struct hl_device *hdev,
else
err_addr = params->block_address + GAUDI_ECC_SERR0_OFFSET;

- if (params->disable_clock_gating) {
- mutex_lock(&gaudi->clk_gate_mutex);
- hdev->asic_funcs->disable_clock_gating(hdev);
- }
-
/* Set invalid wrapper index */
*memory_wrapper_idx = 0xFF;

@@ -7201,8 +7156,7 @@ static int gaudi_extract_ecc_info(struct hl_device *hdev,

if (*memory_wrapper_idx == 0xFF) {
dev_err(hdev->dev, "ECC error information cannot be found\n");
- rc = -EINVAL;
- goto enable_clk_gate;
+ return -EINVAL;
}

WREG32(params->block_address + GAUDI_ECC_MEM_SEL_OFFSET,
@@ -7222,14 +7176,7 @@ static int gaudi_extract_ecc_info(struct hl_device *hdev,

WREG32(params->block_address + GAUDI_ECC_MEM_INFO_CLR_OFFSET, reg);

-enable_clk_gate:
- if (params->disable_clock_gating) {
- hdev->asic_funcs->set_clock_gating(hdev);
-
- mutex_unlock(&gaudi->clk_gate_mutex);
- }
-
- return rc;
+ return 0;
}

/*
@@ -7487,7 +7434,6 @@ static void gaudi_handle_ecc_event(struct hl_device *hdev, u16 event_type,
params.block_address = mmTPC0_CFG_BASE + index * TPC_CFG_OFFSET;
params.num_memories = 90;
params.derr = false;
- params.disable_clock_gating = true;
extract_info_from_fw = false;
break;
case GAUDI_EVENT_TPC0_DERR ... GAUDI_EVENT_TPC7_DERR:
@@ -7496,7 +7442,6 @@ static void gaudi_handle_ecc_event(struct hl_device *hdev, u16 event_type,
mmTPC0_CFG_BASE + index * TPC_CFG_OFFSET;
params.num_memories = 90;
params.derr = true;
- params.disable_clock_gating = true;
extract_info_from_fw = false;
break;
case GAUDI_EVENT_MME0_ACC_SERR:
@@ -7507,7 +7452,6 @@ static void gaudi_handle_ecc_event(struct hl_device *hdev, u16 event_type,
params.block_address = mmMME0_ACC_BASE + index * MME_ACC_OFFSET;
params.num_memories = 128;
params.derr = false;
- params.disable_clock_gating = true;
extract_info_from_fw = false;
break;
case GAUDI_EVENT_MME0_ACC_DERR:
@@ -7518,7 +7462,6 @@ static void gaudi_handle_ecc_event(struct hl_device *hdev, u16 event_type,
params.block_address = mmMME0_ACC_BASE + index * MME_ACC_OFFSET;
params.num_memories = 128;
params.derr = true;
- params.disable_clock_gating = true;
extract_info_from_fw = false;
break;
case GAUDI_EVENT_MME0_SBAB_SERR:
@@ -7530,7 +7473,6 @@ static void gaudi_handle_ecc_event(struct hl_device *hdev, u16 event_type,
mmMME0_SBAB_BASE + index * MME_ACC_OFFSET;
params.num_memories = 33;
params.derr = false;
- params.disable_clock_gating = true;
extract_info_from_fw = false;
break;
case GAUDI_EVENT_MME0_SBAB_DERR:
@@ -7542,7 +7484,6 @@ static void gaudi_handle_ecc_event(struct hl_device *hdev, u16 event_type,
mmMME0_SBAB_BASE + index * MME_ACC_OFFSET;
params.num_memories = 33;
params.derr = true;
- params.disable_clock_gating = true;
extract_info_from_fw = false;
break;
default:
@@ -7864,19 +7805,9 @@ static int gaudi_hbm_event_to_dev(u16 hbm_event_type)
static bool gaudi_tpc_read_interrupts(struct hl_device *hdev, u8 tpc_id,
char *interrupt_name)
{
- struct gaudi_device *gaudi = hdev->asic_specific;
u32 tpc_offset = tpc_id * TPC_CFG_OFFSET, tpc_interrupts_cause, i;
bool soft_reset_required = false;

- /* Accessing the TPC_INTR_CAUSE registers requires disabling the clock
- * gating, and thus cannot be done in CPU-CP and should be done instead
- * by the driver.
- */
-
- mutex_lock(&gaudi->clk_gate_mutex);
-
- hdev->asic_funcs->disable_clock_gating(hdev);
-
tpc_interrupts_cause = RREG32(mmTPC0_CFG_TPC_INTR_CAUSE + tpc_offset) &
TPC0_CFG_TPC_INTR_CAUSE_CAUSE_MASK;

@@ -7894,10 +7825,6 @@ static bool gaudi_tpc_read_interrupts(struct hl_device *hdev, u8 tpc_id,
/* Clear interrupts */
WREG32(mmTPC0_CFG_TPC_INTR_CAUSE + tpc_offset, 0);

- hdev->asic_funcs->set_clock_gating(hdev);
-
- mutex_unlock(&gaudi->clk_gate_mutex);
-
return soft_reset_required;
}

@@ -8359,10 +8286,6 @@ static bool gaudi_is_device_idle(struct hl_device *hdev, u64 *mask_arr,
u64 offset;
int i, dma_id, port;

- mutex_lock(&gaudi->clk_gate_mutex);
-
- hdev->asic_funcs->disable_clock_gating(hdev);
-
if (s)
seq_puts(s,
"\nDMA is_idle QM_GLBL_STS0 QM_CGM_STS DMA_CORE_STS0\n"
@@ -8483,10 +8406,6 @@ static bool gaudi_is_device_idle(struct hl_device *hdev, u64 *mask_arr,
if (s)
seq_puts(s, "\n");

- hdev->asic_funcs->set_clock_gating(hdev);
-
- mutex_unlock(&gaudi->clk_gate_mutex);
-
return is_idle;
}

@@ -8526,10 +8445,8 @@ static int gaudi_get_eeprom_data(struct hl_device *hdev, void *data,
* this function should be used only during initialization and/or after reset,
* when there are no active users.
*/
-static int gaudi_run_tpc_kernel(struct hl_device *hdev, u64 tpc_kernel,
- u32 tpc_id)
+static int gaudi_run_tpc_kernel(struct hl_device *hdev, u64 tpc_kernel, u32 tpc_id)
{
- struct gaudi_device *gaudi = hdev->asic_specific;
u64 kernel_timeout;
u32 status, offset;
int rc;
@@ -8541,10 +8458,6 @@ static int gaudi_run_tpc_kernel(struct hl_device *hdev, u64 tpc_kernel,
else
kernel_timeout = HL_DEVICE_TIMEOUT_USEC;

- mutex_lock(&gaudi->clk_gate_mutex);
-
- hdev->asic_funcs->disable_clock_gating(hdev);
-
WREG32(mmTPC0_CFG_QM_KERNEL_BASE_ADDRESS_LOW + offset,
lower_32_bits(tpc_kernel));
WREG32(mmTPC0_CFG_QM_KERNEL_BASE_ADDRESS_HIGH + offset,
@@ -8584,8 +8497,6 @@ static int gaudi_run_tpc_kernel(struct hl_device *hdev, u64 tpc_kernel,
dev_err(hdev->dev,
"Timeout while waiting for TPC%d icache prefetch\n",
tpc_id);
- hdev->asic_funcs->set_clock_gating(hdev);
- mutex_unlock(&gaudi->clk_gate_mutex);
return -EIO;
}

@@ -8609,8 +8520,6 @@ static int gaudi_run_tpc_kernel(struct hl_device *hdev, u64 tpc_kernel,
dev_err(hdev->dev,
"Timeout while waiting for TPC%d vector pipe\n",
tpc_id);
- hdev->asic_funcs->set_clock_gating(hdev);
- mutex_unlock(&gaudi->clk_gate_mutex);
return -EIO;
}

@@ -8622,9 +8531,6 @@ static int gaudi_run_tpc_kernel(struct hl_device *hdev, u64 tpc_kernel,
1000,
kernel_timeout);

- hdev->asic_funcs->set_clock_gating(hdev);
- mutex_unlock(&gaudi->clk_gate_mutex);
-
if (rc) {
dev_err(hdev->dev,
"Timeout while waiting for TPC%d kernel to execute\n",
@@ -9191,23 +9097,15 @@ static int gaudi_gen_sync_to_engine_map(struct hl_device *hdev,
struct hl_sync_to_engine_map *map)
{
struct hl_state_dump_specs *sds = &hdev->state_dump_specs;
- struct gaudi_device *gaudi = hdev->asic_specific;
int i, j, rc;
u32 reg_value;

/* Iterate over TPC engines */
for (i = 0; i < sds->props[SP_NUM_OF_TPC_ENGINES]; ++i) {
- /* TPC registered must be accessed with clock gating disabled */
- mutex_lock(&gaudi->clk_gate_mutex);
- hdev->asic_funcs->disable_clock_gating(hdev);

reg_value = RREG32(sds->props[SP_TPC0_CFG_SO] +
sds->props[SP_NEXT_TPC] * i);

- /* We can reenable clock_gating */
- hdev->asic_funcs->set_clock_gating(hdev);
- mutex_unlock(&gaudi->clk_gate_mutex);
-
rc = gaudi_add_sync_to_engine_map_entry(map, reg_value,
ENGINE_TPC, i);
if (rc)
@@ -9217,20 +9115,11 @@ static int gaudi_gen_sync_to_engine_map(struct hl_device *hdev,
/* Iterate over MME engines */
for (i = 0; i < sds->props[SP_NUM_OF_MME_ENGINES]; ++i) {
for (j = 0; j < sds->props[SP_SUB_MME_ENG_NUM]; ++j) {
- /* MME registered must be accessed with clock gating
- * disabled
- */
- mutex_lock(&gaudi->clk_gate_mutex);
- hdev->asic_funcs->disable_clock_gating(hdev);

reg_value = RREG32(sds->props[SP_MME_CFG_SO] +
sds->props[SP_NEXT_MME] * i +
j * sizeof(u32));

- /* We can reenable clock_gating */
- hdev->asic_funcs->set_clock_gating(hdev);
- mutex_unlock(&gaudi->clk_gate_mutex);
-
rc = gaudi_add_sync_to_engine_map_entry(
map, reg_value, ENGINE_MME,
i * sds->props[SP_SUB_MME_ENG_NUM] + j);
@@ -9481,8 +9370,6 @@ static const struct hl_asic_funcs gaudi_funcs = {
.mmu_invalidate_cache = gaudi_mmu_invalidate_cache,
.mmu_invalidate_cache_range = gaudi_mmu_invalidate_cache_range,
.send_heartbeat = gaudi_send_heartbeat,
- .set_clock_gating = gaudi_set_clock_gating,
- .disable_clock_gating = gaudi_disable_clock_gating,
.debug_coresight = gaudi_debug_coresight,
.is_device_idle = gaudi_is_device_idle,
.non_hard_reset_late_init = gaudi_non_hard_reset_late_init,
diff --git a/drivers/misc/habanalabs/gaudi/gaudiP.h b/drivers/misc/habanalabs/gaudi/gaudiP.h
index caa858bf6edc..fdadcbf3ef80 100644
--- a/drivers/misc/habanalabs/gaudi/gaudiP.h
+++ b/drivers/misc/habanalabs/gaudi/gaudiP.h
@@ -312,8 +312,6 @@ struct gaudi_internal_qman_info {
* struct gaudi_device - ASIC specific manage structure.
* @cpucp_info_get: get information on device from CPU-CP
* @hw_queues_lock: protects the H/W queues from concurrent access.
- * @clk_gate_mutex: protects code areas that require clock gating to be disabled
- * temporarily
* @internal_qmans: Internal QMANs information. The array size is larger than
* the actual number of internal queues because they are not in
* consecutive order.
@@ -336,7 +334,6 @@ struct gaudi_device {

/* TODO: remove hw_queues_lock after moving to scheduler code */
spinlock_t hw_queues_lock;
- struct mutex clk_gate_mutex;

struct gaudi_internal_qman_info internal_qmans[GAUDI_QUEUE_ID_SIZE];

diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
index fbcc7bbf44b3..954ef4d7bbf7 100644
--- a/drivers/misc/habanalabs/goya/goya.c
+++ b/drivers/misc/habanalabs/goya/goya.c
@@ -5391,16 +5391,6 @@ int goya_cpucp_info_get(struct hl_device *hdev)
return 0;
}

-static void goya_set_clock_gating(struct hl_device *hdev)
-{
- /* clock gating not supported in Goya */
-}
-
-static void goya_disable_clock_gating(struct hl_device *hdev)
-{
- /* clock gating not supported in Goya */
-}
-
static bool goya_is_device_idle(struct hl_device *hdev, u64 *mask_arr,
u8 mask_len, struct seq_file *s)
{
@@ -5734,8 +5724,6 @@ static const struct hl_asic_funcs goya_funcs = {
.mmu_invalidate_cache = goya_mmu_invalidate_cache,
.mmu_invalidate_cache_range = goya_mmu_invalidate_cache_range,
.send_heartbeat = goya_send_heartbeat,
- .set_clock_gating = goya_set_clock_gating,
- .disable_clock_gating = goya_disable_clock_gating,
.debug_coresight = goya_debug_coresight,
.is_device_idle = goya_is_device_idle,
.non_hard_reset_late_init = goya_non_hard_reset_late_init,
--
2.25.1

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Next in thread: Oded Gabbay: "[PATCH 03/30] habanalabs: fix possible memory leak in MMU DR fini"
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