habanalabs: remove soft-reset support from GAUDI

Soft-reset isn't supported in GAUDI. Remove the code that performs it and
print error in case the user wants to do it via sysfs.

Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Reviewed-by: Tomer Tayar <ttayar@habana.ai>

diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
index a6e40de..eede6c3 100644 (file)
--- a/drivers/misc/habanalabs/gaudi/gaudi.c
+++ b/drivers/misc/habanalabs/gaudi/gaudi.c
@@ -75,7 +75,6 @@
 
 #define GAUDI_PLDM_RESET_WAIT_MSEC     1000            /* 1s */
 #define GAUDI_PLDM_HRESET_TIMEOUT_MSEC 20000           /* 20s */
-#define GAUDI_PLDM_SRESET_TIMEOUT_MSEC 14000           /* 14s */
 #define GAUDI_PLDM_TEST_QUEUE_WAIT_USEC        1000000         /* 1s */
 #define GAUDI_PLDM_MMU_TIMEOUT_USEC    (MMU_CONFIG_TIMEOUT_USEC * 100)
 #define GAUDI_PLDM_QMAN0_TIMEOUT_USEC  (HL_DEVICE_TIMEOUT_USEC * 30)
@@ -2587,16 +2586,14 @@ static void gaudi_halt_engines(struct hl_device *hdev, bool hard_reset)
                cpu_timeout_ms = GAUDI_CPU_RESET_WAIT_MSEC;
        }
 
-       if (hard_reset) {
-               /*
-                * I don't know what is the state of the CPU so make sure it is
-                * stopped in any means necessary
-                */
-               WREG32(mmPSOC_GLOBAL_CONF_KMD_MSG_TO_CPU, KMD_MSG_GOTO_WFE);
-               WREG32(mmGIC_DISTRIBUTOR__5_GICD_SETSPI_NSR,
-                               GAUDI_EVENT_HALT_MACHINE);
-               msleep(cpu_timeout_ms);
-       }
+       /*
+        * I don't know what is the state of the CPU so make sure it is
+        * stopped in any means necessary
+        */
+       WREG32(mmPSOC_GLOBAL_CONF_KMD_MSG_TO_CPU, KMD_MSG_GOTO_WFE);
+       WREG32(mmGIC_DISTRIBUTOR__5_GICD_SETSPI_NSR,
+                       GAUDI_EVENT_HALT_MACHINE);
+       msleep(cpu_timeout_ms);
 
        gaudi_stop_mme_qmans(hdev);
        gaudi_stop_tpc_qmans(hdev);
@@ -2621,10 +2618,7 @@ static void gaudi_halt_engines(struct hl_device *hdev, bool hard_reset)
 
        gaudi_disable_timestamp(hdev);
 
-       if (hard_reset)
-               gaudi_disable_msi(hdev);
-       else
-               gaudi_sync_irqs(hdev);
+       gaudi_disable_msi(hdev);
 }
 
 static int gaudi_mmu_init(struct hl_device *hdev)
@@ -2969,46 +2963,37 @@ static void gaudi_hw_fini(struct hl_device *hdev, bool hard_reset)
        struct gaudi_device *gaudi = hdev->asic_specific;
        u32 status, reset_timeout_ms, boot_strap = 0;
 
-       if (hdev->pldm) {
-               if (hard_reset)
-                       reset_timeout_ms = GAUDI_PLDM_HRESET_TIMEOUT_MSEC;
-               else
-                       reset_timeout_ms = GAUDI_PLDM_SRESET_TIMEOUT_MSEC;
-       } else {
-               reset_timeout_ms = GAUDI_RESET_TIMEOUT_MSEC;
+       if (!hard_reset) {
+               dev_err(hdev->dev, "GAUDI doesn't support soft-reset\n");
+               return;
        }
 
-       if (hard_reset) {
-               /* Tell ASIC not to re-initialize PCIe */
-               WREG32(mmPREBOOT_PCIE_EN, LKD_HARD_RESET_MAGIC);
+       if (hdev->pldm)
+               reset_timeout_ms = GAUDI_PLDM_HRESET_TIMEOUT_MSEC;
+       else
+               reset_timeout_ms = GAUDI_RESET_TIMEOUT_MSEC;
+
+       /* Tell ASIC not to re-initialize PCIe */
+       WREG32(mmPREBOOT_PCIE_EN, LKD_HARD_RESET_MAGIC);
 
-               boot_strap = RREG32(mmPSOC_GLOBAL_CONF_BOOT_STRAP_PINS);
-               /* H/W bug WA:
-                * rdata[31:0] = strap_read_val;
-                * wdata[31:0] = rdata[30:21],1'b0,rdata[20:0]
-                */
-               boot_strap = (((boot_strap & 0x7FE00000) << 1) |
-                               (boot_strap & 0x001FFFFF));
-               WREG32(mmPSOC_GLOBAL_CONF_BOOT_STRAP_PINS, boot_strap & ~0x2);
-
-               /* Restart BTL/BLR upon hard-reset */
-               WREG32(mmPSOC_GLOBAL_CONF_BOOT_SEQ_RE_START, 1);
-
-               WREG32(mmPSOC_GLOBAL_CONF_SW_ALL_RST,
-                               1 << PSOC_GLOBAL_CONF_SW_ALL_RST_IND_SHIFT);
-               dev_info(hdev->dev,
-                       "Issued HARD reset command, going to wait %dms\n",
-                       reset_timeout_ms);
-       } else {
-               /* Don't restart BTL/BLR upon soft-reset */
-               WREG32(mmPSOC_GLOBAL_CONF_BOOT_SEQ_RE_START, 0);
+       boot_strap = RREG32(mmPSOC_GLOBAL_CONF_BOOT_STRAP_PINS);
 
-               WREG32(mmPSOC_GLOBAL_CONF_SOFT_RST,
-                               1 << PSOC_GLOBAL_CONF_SOFT_RST_IND_SHIFT);
-               dev_info(hdev->dev,
-                       "Issued SOFT reset command, going to wait %dms\n",
-                       reset_timeout_ms);
-       }
+       /* H/W bug WA:
+        * rdata[31:0] = strap_read_val;
+        * wdata[31:0] = rdata[30:21],1'b0,rdata[20:0]
+        */
+       boot_strap = (((boot_strap & 0x7FE00000) << 1) |
+                       (boot_strap & 0x001FFFFF));
+       WREG32(mmPSOC_GLOBAL_CONF_BOOT_STRAP_PINS, boot_strap & ~0x2);
+
+       /* Restart BTL/BLR upon hard-reset */
+       WREG32(mmPSOC_GLOBAL_CONF_BOOT_SEQ_RE_START, 1);
+
+       WREG32(mmPSOC_GLOBAL_CONF_SW_ALL_RST,
+                       1 << PSOC_GLOBAL_CONF_SW_ALL_RST_IND_SHIFT);
+       dev_info(hdev->dev,
+               "Issued HARD reset command, going to wait %dms\n",
+               reset_timeout_ms);
 
        /*
         * After hard reset, we can't poll the BTM_FSM register because the PSOC
@@ -3022,18 +3007,6 @@ static void gaudi_hw_fini(struct hl_device *hdev, bool hard_reset)
                        "Timeout while waiting for device to reset 0x%x\n",
                        status);
 
-       if (!hard_reset) {
-               gaudi->hw_cap_initialized &= ~(HW_CAP_PCI_DMA | HW_CAP_MME |
-                                               HW_CAP_TPC_MASK |
-                                               HW_CAP_HBM_DMA);
-
-               WREG32(mmGIC_DISTRIBUTOR__5_GICD_SETSPI_NSR,
-                               GAUDI_EVENT_SOFT_RESET);
-               return;
-       }
-
-       /* We continue here only for hard-reset */
-
        WREG32(mmPSOC_GLOBAL_CONF_BOOT_STRAP_PINS, boot_strap);
 
        gaudi->hw_cap_initialized &= ~(HW_CAP_CPU | HW_CAP_CPU_Q |