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habanalabs/gaudi: disable CGM permanently 

Due to the need of SynapseAI to configure all TPC engines from a single
QMAN, the driver must disable CGM and never allow the user to enable
it. Otherwise, the configuration of the TPC engines will fail.

Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
This commit is contained in:
Oded Gabbay 2022-01-05 23:14:45 +02:00
parent eb85eec858
commit 4edb4ffe39
6 changed files with 66 additions and 221 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
Documentation/ABI/testing/debugfs-driver-habanalabs
View File

@ -12,24 +12,7 @@ What: /sys/kernel/debug/habanalabs/hl<n>/clk_gate
Date: May 2020
KernelVersion: 5.8
Contact: ogabbay@kernel.org
Description: Allow the root user to disable/enable in runtime the clock
gating mechanism in Gaudi. Due to how Gaudi is built, the
clock gating needs to be disabled in order to access the
registers of the TPC and MME engines. This is sometimes needed
during debug by the user and hence the user needs this option.
The user can supply a bitmask value, each bit represents
a different engine to disable/enable its clock gating feature.
The bitmask is composed of 20 bits:
======= ============
0 - 7 DMA channels
8 - 11 MME engines
12 - 19 TPC engines
======= ============
The bit's location of a specific engine can be determined
using (1 << GAUDI_ENGINE_ID_*). GAUDI_ENGINE_ID_* values
are defined in uapi habanalabs.h file in enum gaudi_engine_id
Description: This setting is now deprecated as clock gating is handled solely by the f/w
What: /sys/kernel/debug/habanalabs/hl<n>/command_buffers
Date: Jan 2019

32
drivers/misc/habanalabs/common/debugfs.c
View File

@ -1054,42 +1054,12 @@ static ssize_t hl_device_write(struct file *f, const char __user *buf,
static ssize_t hl_clk_gate_read(struct file *f, char __user *buf,
size_t count, loff_t *ppos)
{
struct hl_dbg_device_entry *entry = file_inode(f)->i_private;
struct hl_device *hdev = entry->hdev;
char tmp_buf[200];
ssize_t rc;
if (*ppos)
return 0;
sprintf(tmp_buf, "0x%llx\n", hdev->clock_gating_mask);
rc = simple_read_from_buffer(buf, count, ppos, tmp_buf,
strlen(tmp_buf) + 1);
return rc;
return 0;
}
static ssize_t hl_clk_gate_write(struct file *f, const char __user *buf,
size_t count, loff_t *ppos)
{
struct hl_dbg_device_entry *entry = file_inode(f)->i_private;
struct hl_device *hdev = entry->hdev;
u64 value;
ssize_t rc;
if (hdev->reset_info.in_reset) {
dev_warn_ratelimited(hdev->dev,
"Can't change clock gating during reset\n");
return 0;
}
rc = kstrtoull_from_user(buf, count, 16, &value);
if (rc)
return rc;
hdev->clock_gating_mask = value;
hdev->asic_funcs->set_clock_gating(hdev);
return count;
}

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

@ -2569,9 +2569,6 @@ struct hl_reset_info {
* @max_power: the max power of the device, as configured by the sysadmin. This
* value is saved so in case of hard-reset, the driver will restore
* this value and update the F/W after the re-initialization
* @clock_gating_mask: is clock gating enabled. bitmask that represents the
* different engines. See debugfs-driver-habanalabs for
* details.
* @boot_error_status_mask: contains a mask of the device boot error status.
* Each bit represents a different error, according to
* the defines in hl_boot_if.h. If the bit is cleared,
@ -2710,7 +2707,6 @@ struct hl_device {
atomic64_t dram_used_mem;
u64 timeout_jiffies;
u64 max_power;
u64 clock_gating_mask;
u64 boot_error_status_mask;
u64 dram_pci_bar_start;
u64 last_successful_open_jif;

1
drivers/misc/habanalabs/common/habanalabs_drv.c
View File

@ -256,7 +256,6 @@ static void set_driver_behavior_per_device(struct hl_device *hdev)
hdev->cpu_queues_enable = 1;
hdev->heartbeat = 1;
hdev->mmu_enable = 1;
hdev->clock_gating_mask = ULONG_MAX;
hdev->sram_scrambler_enable = 1;
hdev->dram_scrambler_enable = 1;
hdev->bmc_enable = 1;

230
drivers/misc/habanalabs/gaudi/gaudi.c
View File

@ -3740,74 +3740,10 @@ static void gaudi_tpc_stall(struct hl_device *hdev)
static void gaudi_set_clock_gating(struct hl_device *hdev)
{
struct gaudi_device *gaudi = hdev->asic_specific;
u32 qman_offset;
bool enable;
int i;
/* In case we are during debug session, don't enable the clock gate
* as it may interfere
*/
if (hdev->in_debug)
return;
if (hdev->asic_prop.fw_security_enabled)
return;
for (i = GAUDI_PCI_DMA_1, qman_offset = 0 ; i < GAUDI_HBM_DMA_1 ; i++) {
enable = !!(hdev->clock_gating_mask &
(BIT_ULL(gaudi_dma_assignment[i])));
qman_offset = gaudi_dma_assignment[i] * DMA_QMAN_OFFSET;
WREG32(mmDMA0_QM_CGM_CFG1 + qman_offset,
enable ? QMAN_CGM1_PWR_GATE_EN : 0);
WREG32(mmDMA0_QM_CGM_CFG + qman_offset,
enable ? QMAN_UPPER_CP_CGM_PWR_GATE_EN : 0);
}
for (i = GAUDI_HBM_DMA_1 ; i < GAUDI_DMA_MAX ; i++) {
enable = !!(hdev->clock_gating_mask &
(BIT_ULL(gaudi_dma_assignment[i])));
/* GC sends work to DMA engine through Upper CP in DMA5 so
* we need to not enable clock gating in that DMA
*/
if (i == GAUDI_HBM_DMA_4)
enable = 0;
qman_offset = gaudi_dma_assignment[i] * DMA_QMAN_OFFSET;
WREG32(mmDMA0_QM_CGM_CFG1 + qman_offset,
enable ? QMAN_CGM1_PWR_GATE_EN : 0);
WREG32(mmDMA0_QM_CGM_CFG + qman_offset,
enable ? QMAN_COMMON_CP_CGM_PWR_GATE_EN : 0);
}
enable = !!(hdev->clock_gating_mask & (BIT_ULL(GAUDI_ENGINE_ID_MME_0)));
WREG32(mmMME0_QM_CGM_CFG1, enable ? QMAN_CGM1_PWR_GATE_EN : 0);
WREG32(mmMME0_QM_CGM_CFG, enable ? QMAN_COMMON_CP_CGM_PWR_GATE_EN : 0);
enable = !!(hdev->clock_gating_mask & (BIT_ULL(GAUDI_ENGINE_ID_MME_2)));
WREG32(mmMME2_QM_CGM_CFG1, enable ? QMAN_CGM1_PWR_GATE_EN : 0);
WREG32(mmMME2_QM_CGM_CFG, enable ? QMAN_COMMON_CP_CGM_PWR_GATE_EN : 0);
for (i = 0, qman_offset = 0 ; i < TPC_NUMBER_OF_ENGINES ; i++) {
enable = !!(hdev->clock_gating_mask &
(BIT_ULL(GAUDI_ENGINE_ID_TPC_0 + i)));
WREG32(mmTPC0_QM_CGM_CFG1 + qman_offset,
enable ? QMAN_CGM1_PWR_GATE_EN : 0);
WREG32(mmTPC0_QM_CGM_CFG + qman_offset,
enable ? QMAN_COMMON_CP_CGM_PWR_GATE_EN : 0);
qman_offset += TPC_QMAN_OFFSET;
}
gaudi->hw_cap_initialized |= HW_CAP_CLK_GATE;
}
static void gaudi_disable_clock_gating(struct hl_device *hdev)
{
struct gaudi_device *gaudi = hdev->asic_specific;
u32 qman_offset;
int i;
@ -3832,8 +3768,6 @@ static void gaudi_disable_clock_gating(struct hl_device *hdev)
qman_offset += (mmTPC1_QM_CGM_CFG - mmTPC0_QM_CGM_CFG);
}
gaudi->hw_cap_initialized &= ~(HW_CAP_CLK_GATE);
}
static void gaudi_enable_timestamp(struct hl_device *hdev)
@ -4400,14 +4334,11 @@ skip_reset:
status);
if (gaudi) {
gaudi->hw_cap_initialized &= ~(HW_CAP_CPU | HW_CAP_CPU_Q |
HW_CAP_HBM | HW_CAP_PCI_DMA |
HW_CAP_MME | HW_CAP_TPC_MASK |
HW_CAP_HBM_DMA | HW_CAP_PLL |
HW_CAP_NIC_MASK | HW_CAP_MMU |
HW_CAP_SRAM_SCRAMBLER |
HW_CAP_HBM_SCRAMBLER |
HW_CAP_CLK_GATE);
gaudi->hw_cap_initialized &= ~(HW_CAP_CPU | HW_CAP_CPU_Q | HW_CAP_HBM |
HW_CAP_PCI_DMA | HW_CAP_MME | HW_CAP_TPC_MASK |
HW_CAP_HBM_DMA | HW_CAP_PLL | HW_CAP_NIC_MASK |
HW_CAP_MMU | HW_CAP_SRAM_SCRAMBLER |
HW_CAP_HBM_SCRAMBLER);
memset(gaudi->events_stat, 0, sizeof(gaudi->events_stat));
@ -6188,7 +6119,6 @@ static int gaudi_debugfs_read32(struct hl_device *hdev, u64 addr,
bool user_address, u32 *val)
{
struct asic_fixed_properties *prop = &hdev->asic_prop;
struct gaudi_device *gaudi = hdev->asic_specific;
u64 hbm_bar_addr, host_phys_end;
int rc = 0;
@ -6196,38 +6126,31 @@ static int gaudi_debugfs_read32(struct hl_device *hdev, u64 addr,
if ((addr >= CFG_BASE) && (addr < CFG_BASE + CFG_SIZE)) {
if ((gaudi->hw_cap_initialized & HW_CAP_CLK_GATE) &&
(hdev->clock_gating_mask &
GAUDI_CLK_GATE_DEBUGFS_MASK)) {
*val = RREG32(addr - CFG_BASE);
dev_err_ratelimited(hdev->dev,
"Can't read register - clock gating is enabled!\n");
rc = -EFAULT;
} else {
*val = RREG32(addr - CFG_BASE);
}
} else if ((addr >= SRAM_BASE_ADDR) && (addr < SRAM_BASE_ADDR + SRAM_BAR_SIZE)) {
*val = readl(hdev->pcie_bar[SRAM_BAR_ID] + (addr - SRAM_BASE_ADDR));
} else if ((addr >= SRAM_BASE_ADDR) &&
(addr < SRAM_BASE_ADDR + SRAM_BAR_SIZE)) {
*val = readl(hdev->pcie_bar[SRAM_BAR_ID] +
(addr - SRAM_BASE_ADDR));
} else if (addr < DRAM_PHYS_BASE + hdev->asic_prop.dram_size) {
u64 bar_base_addr = DRAM_PHYS_BASE +
(addr & ~(prop->dram_pci_bar_size - 0x1ull));
u64 bar_base_addr = DRAM_PHYS_BASE + (addr & ~(prop->dram_pci_bar_size - 0x1ull));
hbm_bar_addr = gaudi_set_hbm_bar_base(hdev, bar_base_addr);
if (hbm_bar_addr != U64_MAX) {
*val = readl(hdev->pcie_bar[HBM_BAR_ID] +
(addr - bar_base_addr));
hbm_bar_addr = gaudi_set_hbm_bar_base(hdev,
hbm_bar_addr);
if (hbm_bar_addr != U64_MAX) {
*val = readl(hdev->pcie_bar[HBM_BAR_ID] + (addr - bar_base_addr));
hbm_bar_addr = gaudi_set_hbm_bar_base(hdev, hbm_bar_addr);
}
if (hbm_bar_addr == U64_MAX)
rc = -EIO;
} else if (addr >= HOST_PHYS_BASE && addr < host_phys_end &&
user_address && !iommu_present(&pci_bus_type)) {
*val = *(u32 *) phys_to_virt(addr - HOST_PHYS_BASE);
} else {
rc = -EFAULT;
}
@ -6239,7 +6162,6 @@ static int gaudi_debugfs_write32(struct hl_device *hdev, u64 addr,
bool user_address, u32 val)
{
struct asic_fixed_properties *prop = &hdev->asic_prop;
struct gaudi_device *gaudi = hdev->asic_specific;
u64 hbm_bar_addr, host_phys_end;
int rc = 0;
@ -6247,38 +6169,31 @@ static int gaudi_debugfs_write32(struct hl_device *hdev, u64 addr,
if ((addr >= CFG_BASE) && (addr < CFG_BASE + CFG_SIZE)) {
if ((gaudi->hw_cap_initialized & HW_CAP_CLK_GATE) &&
(hdev->clock_gating_mask &
GAUDI_CLK_GATE_DEBUGFS_MASK)) {
WREG32(addr - CFG_BASE, val);
dev_err_ratelimited(hdev->dev,
"Can't write register - clock gating is enabled!\n");
rc = -EFAULT;
} else {
WREG32(addr - CFG_BASE, val);
}
} else if ((addr >= SRAM_BASE_ADDR) && (addr < SRAM_BASE_ADDR + SRAM_BAR_SIZE)) {
writel(val, hdev->pcie_bar[SRAM_BAR_ID] + (addr - SRAM_BASE_ADDR));
} else if ((addr >= SRAM_BASE_ADDR) &&
(addr < SRAM_BASE_ADDR + SRAM_BAR_SIZE)) {
writel(val, hdev->pcie_bar[SRAM_BAR_ID] +
(addr - SRAM_BASE_ADDR));
} else if (addr < DRAM_PHYS_BASE + hdev->asic_prop.dram_size) {
u64 bar_base_addr = DRAM_PHYS_BASE +
(addr & ~(prop->dram_pci_bar_size - 0x1ull));
u64 bar_base_addr = DRAM_PHYS_BASE + (addr & ~(prop->dram_pci_bar_size - 0x1ull));
hbm_bar_addr = gaudi_set_hbm_bar_base(hdev, bar_base_addr);
if (hbm_bar_addr != U64_MAX) {
writel(val, hdev->pcie_bar[HBM_BAR_ID] +
(addr - bar_base_addr));
hbm_bar_addr = gaudi_set_hbm_bar_base(hdev,
hbm_bar_addr);
if (hbm_bar_addr != U64_MAX) {
writel(val, hdev->pcie_bar[HBM_BAR_ID] + (addr - bar_base_addr));
hbm_bar_addr = gaudi_set_hbm_bar_base(hdev, hbm_bar_addr);
}
if (hbm_bar_addr == U64_MAX)
rc = -EIO;
} else if (addr >= HOST_PHYS_BASE && addr < host_phys_end &&
user_address && !iommu_present(&pci_bus_type)) {
*(u32 *) phys_to_virt(addr - HOST_PHYS_BASE) = val;
} else {
rc = -EFAULT;
}
@ -6290,7 +6205,6 @@ static int gaudi_debugfs_read64(struct hl_device *hdev, u64 addr,
bool user_address, u64 *val)
{
struct asic_fixed_properties *prop = &hdev->asic_prop;
struct gaudi_device *gaudi = hdev->asic_specific;
u64 hbm_bar_addr, host_phys_end;
int rc = 0;
@ -6298,42 +6212,35 @@ static int gaudi_debugfs_read64(struct hl_device *hdev, u64 addr,
if ((addr >= CFG_BASE) && (addr <= CFG_BASE + CFG_SIZE - sizeof(u64))) {
if ((gaudi->hw_cap_initialized & HW_CAP_CLK_GATE) &&
(hdev->clock_gating_mask &
GAUDI_CLK_GATE_DEBUGFS_MASK)) {
u32 val_l = RREG32(addr - CFG_BASE);
u32 val_h = RREG32(addr + sizeof(u32) - CFG_BASE);
dev_err_ratelimited(hdev->dev,
"Can't read register - clock gating is enabled!\n");
rc = -EFAULT;
} else {
u32 val_l = RREG32(addr - CFG_BASE);
u32 val_h = RREG32(addr + sizeof(u32) - CFG_BASE);
*val = (((u64) val_h) << 32) | val_l;
}
*val = (((u64) val_h) << 32) | val_l;
} else if ((addr >= SRAM_BASE_ADDR) &&
(addr <= SRAM_BASE_ADDR + SRAM_BAR_SIZE - sizeof(u64))) {
*val = readq(hdev->pcie_bar[SRAM_BAR_ID] +
(addr - SRAM_BASE_ADDR));
} else if (addr <=
DRAM_PHYS_BASE + hdev->asic_prop.dram_size - sizeof(u64)) {
u64 bar_base_addr = DRAM_PHYS_BASE +
(addr & ~(prop->dram_pci_bar_size - 0x1ull));
(addr <= SRAM_BASE_ADDR + SRAM_BAR_SIZE - sizeof(u64))) {
*val = readq(hdev->pcie_bar[SRAM_BAR_ID] + (addr - SRAM_BASE_ADDR));
} else if (addr <= DRAM_PHYS_BASE + hdev->asic_prop.dram_size - sizeof(u64)) {
u64 bar_base_addr = DRAM_PHYS_BASE + (addr & ~(prop->dram_pci_bar_size - 0x1ull));
hbm_bar_addr = gaudi_set_hbm_bar_base(hdev, bar_base_addr);
if (hbm_bar_addr != U64_MAX) {
*val = readq(hdev->pcie_bar[HBM_BAR_ID] +
(addr - bar_base_addr));
hbm_bar_addr = gaudi_set_hbm_bar_base(hdev,
hbm_bar_addr);
if (hbm_bar_addr != U64_MAX) {
*val = readq(hdev->pcie_bar[HBM_BAR_ID] + (addr - bar_base_addr));
hbm_bar_addr = gaudi_set_hbm_bar_base(hdev, hbm_bar_addr);
}
if (hbm_bar_addr == U64_MAX)
rc = -EIO;
} else if (addr >= HOST_PHYS_BASE && addr < host_phys_end &&
user_address && !iommu_present(&pci_bus_type)) {
*val = *(u64 *) phys_to_virt(addr - HOST_PHYS_BASE);
} else {
rc = -EFAULT;
}
@ -6345,7 +6252,6 @@ static int gaudi_debugfs_write64(struct hl_device *hdev, u64 addr,
bool user_address, u64 val)
{
struct asic_fixed_properties *prop = &hdev->asic_prop;
struct gaudi_device *gaudi = hdev->asic_specific;
u64 hbm_bar_addr, host_phys_end;
int rc = 0;
@ -6353,41 +6259,33 @@ static int gaudi_debugfs_write64(struct hl_device *hdev, u64 addr,
if ((addr >= CFG_BASE) && (addr <= CFG_BASE + CFG_SIZE - sizeof(u64))) {
if ((gaudi->hw_cap_initialized & HW_CAP_CLK_GATE) &&
(hdev->clock_gating_mask &
GAUDI_CLK_GATE_DEBUGFS_MASK)) {
dev_err_ratelimited(hdev->dev,
"Can't write register - clock gating is enabled!\n");
rc = -EFAULT;
} else {
WREG32(addr - CFG_BASE, lower_32_bits(val));
WREG32(addr + sizeof(u32) - CFG_BASE,
upper_32_bits(val));
}
WREG32(addr - CFG_BASE, lower_32_bits(val));
WREG32(addr + sizeof(u32) - CFG_BASE, upper_32_bits(val));
} else if ((addr >= SRAM_BASE_ADDR) &&
(addr <= SRAM_BASE_ADDR + SRAM_BAR_SIZE - sizeof(u64))) {
writeq(val, hdev->pcie_bar[SRAM_BAR_ID] +
(addr - SRAM_BASE_ADDR));
} else if (addr <=
DRAM_PHYS_BASE + hdev->asic_prop.dram_size - sizeof(u64)) {
u64 bar_base_addr = DRAM_PHYS_BASE +
(addr & ~(prop->dram_pci_bar_size - 0x1ull));
(addr <= SRAM_BASE_ADDR + SRAM_BAR_SIZE - sizeof(u64))) {
writeq(val, hdev->pcie_bar[SRAM_BAR_ID] + (addr - SRAM_BASE_ADDR));
} else if (addr <= DRAM_PHYS_BASE + hdev->asic_prop.dram_size - sizeof(u64)) {
u64 bar_base_addr = DRAM_PHYS_BASE + (addr & ~(prop->dram_pci_bar_size - 0x1ull));
hbm_bar_addr = gaudi_set_hbm_bar_base(hdev, bar_base_addr);
if (hbm_bar_addr != U64_MAX) {
writeq(val, hdev->pcie_bar[HBM_BAR_ID] +
(addr - bar_base_addr));
hbm_bar_addr = gaudi_set_hbm_bar_base(hdev,
hbm_bar_addr);
if (hbm_bar_addr != U64_MAX) {
writeq(val, hdev->pcie_bar[HBM_BAR_ID] + (addr - bar_base_addr));
hbm_bar_addr = gaudi_set_hbm_bar_base(hdev, hbm_bar_addr);
}
if (hbm_bar_addr == U64_MAX)
rc = -EIO;
} else if (addr >= HOST_PHYS_BASE && addr < host_phys_end &&
user_address && !iommu_present(&pci_bus_type)) {
*(u64 *) phys_to_virt(addr - HOST_PHYS_BASE) = val;
} else {
rc = -EFAULT;
}

1
drivers/misc/habanalabs/gaudi/gaudiP.h
View File

@ -177,7 +177,6 @@
#define HW_CAP_MSI BIT(6)
#define HW_CAP_CPU_Q BIT(7)
#define HW_CAP_HBM_DMA BIT(8)
#define HW_CAP_CLK_GATE BIT(9)
#define HW_CAP_SRAM_SCRAMBLER BIT(10)
#define HW_CAP_HBM_SCRAMBLER BIT(11)