// SPDX-License-Identifier: Apache-2.0 /* * Support for OpenCAPI on POWER9 NPUs * * This file provides support for OpenCAPI as implemented on POWER9. * * At present, we initialise the NPU separately from the NVLink code in npu2.c. * As such, we don't currently support mixed NVLink and OpenCAPI configurations * on the same NPU for machines such as Witherspoon. * * Procedure references in this file are to the POWER9 OpenCAPI NPU Workbook * (IBM internal document). * * TODO: * - Support for mixed NVLink and OpenCAPI on the same NPU * - Support for link ganging (one AFU using multiple links) * - Link reset and error handling * - Presence detection * - Consume HDAT NPU information * - LPC Memory support * * Copyright 2013-2019 IBM Corp. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define NPU_IRQ_LEVELS_XSL 23 #define MAX_PE_HANDLE ((1 << 15) - 1) #define TL_MAX_TEMPLATE 63 #define TL_RATE_BUF_SIZE 32 #define OCAPI_SLOT_NORMAL PCI_SLOT_STATE_NORMAL #define OCAPI_SLOT_LINK PCI_SLOT_STATE_LINK #define OCAPI_SLOT_LINK_START (OCAPI_SLOT_LINK + 1) #define OCAPI_SLOT_LINK_WAIT (OCAPI_SLOT_LINK + 2) #define OCAPI_SLOT_LINK_TRAINED (OCAPI_SLOT_LINK + 3) #define OCAPI_SLOT_FRESET PCI_SLOT_STATE_FRESET #define OCAPI_SLOT_FRESET_START (OCAPI_SLOT_FRESET + 1) #define OCAPI_SLOT_FRESET_INIT (OCAPI_SLOT_FRESET + 2) #define OCAPI_SLOT_FRESET_ASSERT_DELAY (OCAPI_SLOT_FRESET + 3) #define OCAPI_SLOT_FRESET_DEASSERT_DELAY (OCAPI_SLOT_FRESET + 4) #define OCAPI_SLOT_FRESET_INIT_DELAY (OCAPI_SLOT_FRESET + 5) #define OCAPI_LINK_TRAINING_RETRIES 2 #define OCAPI_LINK_TRAINING_TIMEOUT 3000 /* ms */ #define OCAPI_LINK_STATE_TRAINED 0x7 enum npu2_link_training_state { NPU2_TRAIN_DEFAULT, /* fully train the link */ NPU2_TRAIN_PRBS31, /* used for Signal Integrity testing */ NPU2_TRAIN_NONE, /* used for testing with loopback cable */ }; static enum npu2_link_training_state npu2_ocapi_training_state = NPU2_TRAIN_DEFAULT; static const struct phb_ops npu2_opencapi_ops; static inline uint64_t index_to_stack(uint64_t index) { switch (index) { case 2: case 3: return NPU2_STACK_STCK_1; break; case 4: case 5: return NPU2_STACK_STCK_2; break; default: assert(false); } } static inline uint64_t index_to_stacku(uint64_t index) { switch (index) { case 2: case 3: return NPU2_STACK_STCK_1U; break; case 4: case 5: return NPU2_STACK_STCK_2U; break; default: assert(false); } } static inline uint64_t index_to_block(uint64_t index) { switch (index) { case 2: case 4: return NPU2_BLOCK_OTL0; break; case 3: case 5: return NPU2_BLOCK_OTL1; break; default: assert(false); } } static uint64_t get_odl_status(uint32_t gcid, uint64_t index) { uint64_t reg, status_xscom; status_xscom = OB_ODL_STATUS(index); xscom_read(gcid, status_xscom, ®); return reg; } static uint64_t get_odl_training_status(uint32_t gcid, uint64_t index) { uint64_t status_xscom, reg; status_xscom = OB_ODL_TRAINING_STATUS(index); xscom_read(gcid, status_xscom, ®); return reg; } static uint64_t get_odl_endpoint_info(uint32_t gcid, uint64_t index) { uint64_t status_xscom, reg; status_xscom = OB_ODL_ENDPOINT_INFO(index); xscom_read(gcid, status_xscom, ®); return reg; } static void disable_nvlink(uint32_t gcid, int index) { uint64_t phy_config_scom, reg; switch (index) { case 2: case 3: phy_config_scom = OBUS_LL0_IOOL_PHY_CONFIG; break; case 4: case 5: phy_config_scom = OBUS_LL3_IOOL_PHY_CONFIG; break; default: assert(false); } /* Disable NV-Link link layers */ xscom_read(gcid, phy_config_scom, ®); reg &= ~OBUS_IOOL_PHY_CONFIG_NV0_NPU_ENABLED; reg &= ~OBUS_IOOL_PHY_CONFIG_NV1_NPU_ENABLED; reg &= ~OBUS_IOOL_PHY_CONFIG_NV2_NPU_ENABLED; xscom_write(gcid, phy_config_scom, reg); } /* Procedure 13.1.3.1 - select OCAPI vs NVLink for bricks 2-3/4-5 */ static void set_transport_mux_controls(uint32_t gcid, uint32_t scom_base, int index, enum npu2_dev_type type) { /* Step 1 - Set Transport MUX controls to select correct OTL or NTL */ uint64_t reg; uint64_t field; /* TODO: Rework this to select for NVLink too */ assert(type == NPU2_DEV_TYPE_OPENCAPI); prlog(PR_DEBUG, "OCAPI: %s: Setting transport mux controls\n", __func__); /* Optical IO Transport Mux Config for Bricks 0-2 and 4-5 */ reg = npu2_scom_read(gcid, scom_base, NPU2_MISC_OPTICAL_IO_CFG0, NPU2_MISC_DA_LEN_8B); switch (index) { case 0: case 1: /* not valid for OpenCAPI */ assert(false); break; case 2: /* OTL1.0 */ field = GETFIELD(NPU2_MISC_OPTICAL_IO_CFG0_NDLMUX_BRK0TO2, reg); field &= ~0b100; reg = SETFIELD(NPU2_MISC_OPTICAL_IO_CFG0_NDLMUX_BRK0TO2, reg, field); field = GETFIELD(NPU2_MISC_OPTICAL_IO_CFG0_OCMUX_BRK0TO1, reg); field |= 0b10; reg = SETFIELD(NPU2_MISC_OPTICAL_IO_CFG0_OCMUX_BRK0TO1, reg, field); break; case 3: /* OTL1.1 */ field = GETFIELD(NPU2_MISC_OPTICAL_IO_CFG0_NDLMUX_BRK0TO2, reg); field &= ~0b010; reg = SETFIELD(NPU2_MISC_OPTICAL_IO_CFG0_NDLMUX_BRK0TO2, reg, field); field = GETFIELD(NPU2_MISC_OPTICAL_IO_CFG0_OCMUX_BRK0TO1, reg); field |= 0b01; reg = SETFIELD(NPU2_MISC_OPTICAL_IO_CFG0_OCMUX_BRK0TO1, reg, field); break; case 4: /* OTL2.0 */ field = GETFIELD(NPU2_MISC_OPTICAL_IO_CFG0_OCMUX_BRK4TO5, reg); field |= 0b10; reg = SETFIELD(NPU2_MISC_OPTICAL_IO_CFG0_OCMUX_BRK4TO5, reg, field); break; case 5: /* OTL2.1 */ field = GETFIELD(NPU2_MISC_OPTICAL_IO_CFG0_OCMUX_BRK4TO5, reg); field |= 0b01; reg = SETFIELD(NPU2_MISC_OPTICAL_IO_CFG0_OCMUX_BRK4TO5, reg, field); break; default: assert(false); } npu2_scom_write(gcid, scom_base, NPU2_MISC_OPTICAL_IO_CFG0, NPU2_MISC_DA_LEN_8B, reg); /* * PowerBus Optical Miscellaneous Config Register - select * OpenCAPI for b4/5 and A-Link for b3 */ xscom_read(gcid, PU_IOE_PB_MISC_CFG, ®); switch (index) { case 0: case 1: case 2: case 3: break; case 4: reg = SETFIELD(PU_IOE_PB_MISC_CFG_SEL_04_NPU_NOT_PB, reg, 1); break; case 5: reg = SETFIELD(PU_IOE_PB_MISC_CFG_SEL_05_NPU_NOT_PB, reg, 1); break; } xscom_write(gcid, PU_IOE_PB_MISC_CFG, reg); } static void assert_odl_reset(uint32_t gcid, int index) { uint64_t reg, config_xscom; config_xscom = OB_ODL_CONFIG(index); /* Reset ODL */ reg = OB_ODL_CONFIG_RESET; reg = SETFIELD(OB_ODL_CONFIG_VERSION, reg, 0b000001); reg = SETFIELD(OB_ODL_CONFIG_TRAIN_MODE, reg, 0b0110); reg = SETFIELD(OB_ODL_CONFIG_SUPPORTED_MODES, reg, 0b0010); reg |= OB_ODL_CONFIG_X4_BACKOFF_ENABLE; reg = SETFIELD(OB_ODL_CONFIG_PHY_CNTR_LIMIT, reg, 0b1111); reg |= OB_ODL_CONFIG_DEBUG_ENABLE; reg = SETFIELD(OB_ODL_CONFIG_FWD_PROGRESS_TIMER, reg, 0b0110); xscom_write(gcid, config_xscom, reg); } static void deassert_odl_reset(uint32_t gcid, int index) { uint64_t reg, config_xscom; config_xscom = OB_ODL_CONFIG(index); xscom_read(gcid, config_xscom, ®); reg &= ~OB_ODL_CONFIG_RESET; xscom_write(gcid, config_xscom, reg); } static void enable_odl_phy_mux(uint32_t gcid, int index) { uint64_t reg; uint64_t phy_config_scom; prlog(PR_DEBUG, "OCAPI: %s: Enabling ODL to PHY MUXes\n", __func__); /* Step 2 - Enable MUXes for ODL to PHY connection */ switch (index) { case 2: case 3: phy_config_scom = OBUS_LL0_IOOL_PHY_CONFIG; break; case 4: case 5: phy_config_scom = OBUS_LL3_IOOL_PHY_CONFIG; break; default: assert(false); } /* * ODL must be in reset when enabling. * It stays in reset until the link is trained */ assert_odl_reset(gcid, index); /* PowerBus OLL PHY Training Config Register */ xscom_read(gcid, phy_config_scom, ®); /* * Enable ODL to use shared PHYs * * On obus3, OTL0 is connected to ODL1 (and OTL1 to ODL0), so * even if it may look odd at first, we do want to enable ODL0 * for links 2 and 5 */ switch (index) { case 2: case 5: reg |= OBUS_IOOL_PHY_CONFIG_ODL0_ENABLED; break; case 3: case 4: reg |= OBUS_IOOL_PHY_CONFIG_ODL1_ENABLED; break; } /* * Based on the platform, we may have to activate an extra mux * to connect the ODL to the right set of lanes. * * FIXME: to be checked once we have merged with nvlink * code. Need to verify that it's a platform parameter and not * slot-dependent */ if (platform.ocapi->odl_phy_swap) reg |= OBUS_IOOL_PHY_CONFIG_ODL_PHY_SWAP; else reg &= ~OBUS_IOOL_PHY_CONFIG_ODL_PHY_SWAP; /* Disable A-Link link layers */ reg &= ~OBUS_IOOL_PHY_CONFIG_LINK0_OLL_ENABLED; reg &= ~OBUS_IOOL_PHY_CONFIG_LINK1_OLL_ENABLED; xscom_write(gcid, phy_config_scom, reg); } static void disable_alink_fp(uint32_t gcid) { uint64_t reg = 0; prlog(PR_DEBUG, "OCAPI: %s: Disabling A-Link framer/parsers\n", __func__); /* Step 3 - Disable A-Link framers/parsers */ /* TODO: Confirm if needed on OPAL system */ reg |= PU_IOE_PB_FP_CFG_FP0_FMR_DISABLE; reg |= PU_IOE_PB_FP_CFG_FP0_PRS_DISABLE; reg |= PU_IOE_PB_FP_CFG_FP1_FMR_DISABLE; reg |= PU_IOE_PB_FP_CFG_FP1_PRS_DISABLE; xscom_write(gcid, PU_IOE_PB_FP01_CFG, reg); xscom_write(gcid, PU_IOE_PB_FP23_CFG, reg); xscom_write(gcid, PU_IOE_PB_FP45_CFG, reg); xscom_write(gcid, PU_IOE_PB_FP67_CFG, reg); } static void enable_xsl_clocks(uint32_t gcid, uint32_t scom_base, int index) { /* Step 5 - Enable Clocks in XSL */ prlog(PR_DEBUG, "OCAPI: %s: Enable clocks in XSL\n", __func__); npu2_scom_write(gcid, scom_base, NPU2_REG_OFFSET(index_to_stack(index), NPU2_BLOCK_XSL, NPU2_XSL_WRAP_CFG), NPU2_MISC_DA_LEN_8B, NPU2_XSL_WRAP_CFG_XSLO_CLOCK_ENABLE); } #define CQ_CTL_STATUS_TIMEOUT 10 /* milliseconds */ static int set_fence_control(uint32_t gcid, uint32_t scom_base, int index, uint8_t status) { int stack, block; uint64_t reg, status_field; uint8_t status_val; uint64_t fence_control; uint64_t timeout = mftb() + msecs_to_tb(CQ_CTL_STATUS_TIMEOUT); stack = index_to_stack(index); block = index_to_block(index); fence_control = NPU2_REG_OFFSET(stack, NPU2_BLOCK_CTL, block == NPU2_BLOCK_OTL0 ? NPU2_CQ_CTL_FENCE_CONTROL_0 : NPU2_CQ_CTL_FENCE_CONTROL_1); reg = SETFIELD(NPU2_CQ_CTL_FENCE_CONTROL_REQUEST_FENCE, 0ull, status); npu2_scom_write(gcid, scom_base, fence_control, NPU2_MISC_DA_LEN_8B, reg); /* Wait for fence status to update */ if (index_to_block(index) == NPU2_BLOCK_OTL0) status_field = NPU2_CQ_CTL_STATUS_BRK0_AM_FENCED; else status_field = NPU2_CQ_CTL_STATUS_BRK1_AM_FENCED; do { reg = npu2_scom_read(gcid, scom_base, NPU2_REG_OFFSET(index_to_stack(index), NPU2_BLOCK_CTL, NPU2_CQ_CTL_STATUS), NPU2_MISC_DA_LEN_8B); status_val = GETFIELD(status_field, reg); if (status_val == status) return OPAL_SUCCESS; time_wait_ms(1); } while (tb_compare(mftb(), timeout) == TB_ABEFOREB); /** * @fwts-label OCAPIFenceStatusTimeout * @fwts-advice The NPU fence status did not update as expected. This * could be the result of a firmware or hardware bug. OpenCAPI * functionality could be broken. */ prlog(PR_ERR, "OCAPI: Fence status for brick %d stuck: expected 0x%x, got 0x%x\n", index, status, status_val); return OPAL_HARDWARE; } static void set_npcq_config(uint32_t gcid, uint32_t scom_base, int index) { uint64_t reg, stack, block; prlog(PR_DEBUG, "OCAPI: %s: Set NPCQ Config\n", __func__); /* Step 6 - Set NPCQ configuration */ /* CQ_CTL Misc Config Register #0 */ stack = index_to_stack(index); block = index_to_block(index); /* Enable OTL */ npu2_scom_write(gcid, scom_base, NPU2_OTL_CONFIG0(stack, block), NPU2_MISC_DA_LEN_8B, NPU2_OTL_CONFIG0_EN); set_fence_control(gcid, scom_base, index, 0b01); reg = npu2_scom_read(gcid, scom_base, NPU2_REG_OFFSET(stack, NPU2_BLOCK_CTL, NPU2_CQ_CTL_MISC_CFG), NPU2_MISC_DA_LEN_8B); /* Set OCAPI mode */ reg |= NPU2_CQ_CTL_MISC_CFG_CONFIG_OCAPI_MODE; if (block == NPU2_BLOCK_OTL0) reg |= NPU2_CQ_CTL_MISC_CFG_CONFIG_OTL0_ENABLE; else reg |= NPU2_CQ_CTL_MISC_CFG_CONFIG_OTL1_ENABLE; npu2_scom_write(gcid, scom_base, NPU2_REG_OFFSET(stack, NPU2_BLOCK_CTL, NPU2_CQ_CTL_MISC_CFG), NPU2_MISC_DA_LEN_8B, reg); /* NPU Fenced */ set_fence_control(gcid, scom_base, index, 0b11); /* NPU Half Fenced */ set_fence_control(gcid, scom_base, index, 0b10); /* CQ_DAT Misc Config Register #1 */ reg = npu2_scom_read(gcid, scom_base, NPU2_REG_OFFSET(stack, NPU2_BLOCK_DAT, NPU2_CQ_DAT_MISC_CFG), NPU2_MISC_DA_LEN_8B); /* Set OCAPI mode for bricks 2-5 */ reg |= NPU2_CQ_DAT_MISC_CFG_CONFIG_OCAPI_MODE; npu2_scom_write(gcid, scom_base, NPU2_REG_OFFSET(stack, NPU2_BLOCK_DAT, NPU2_CQ_DAT_MISC_CFG), NPU2_MISC_DA_LEN_8B, reg); /* CQ_SM Misc Config Register #0 */ for (block = NPU2_BLOCK_SM_0; block <= NPU2_BLOCK_SM_3; block++) { reg = npu2_scom_read(gcid, scom_base, NPU2_REG_OFFSET(stack, block, NPU2_CQ_SM_MISC_CFG0), NPU2_MISC_DA_LEN_8B); /* Set OCAPI mode for bricks 2-5 */ reg |= NPU2_CQ_SM_MISC_CFG0_CONFIG_OCAPI_MODE; npu2_scom_write(gcid, scom_base, NPU2_REG_OFFSET(stack, block, NPU2_CQ_SM_MISC_CFG0), NPU2_MISC_DA_LEN_8B, reg); } } static void enable_xsl_xts_interfaces(uint32_t gcid, uint32_t scom_base, int index) { uint64_t reg; prlog(PR_DEBUG, "OCAPI: %s: Enable XSL-XTS Interfaces\n", __func__); /* Step 7 - Enable XSL-XTS interfaces */ /* XTS Config Register - Enable XSL-XTS interface */ reg = npu2_scom_read(gcid, scom_base, NPU2_XTS_CFG, NPU2_MISC_DA_LEN_8B); reg |= NPU2_XTS_CFG_OPENCAPI; npu2_scom_write(gcid, scom_base, NPU2_XTS_CFG, NPU2_MISC_DA_LEN_8B, reg); /* XTS Config2 Register - Enable XSL1/2 */ reg = npu2_scom_read(gcid, scom_base, NPU2_XTS_CFG2, NPU2_MISC_DA_LEN_8B); switch (index_to_stack(index)) { case NPU2_STACK_STCK_1: reg |= NPU2_XTS_CFG2_XSL1_ENA; break; case NPU2_STACK_STCK_2: reg |= NPU2_XTS_CFG2_XSL2_ENA; break; } npu2_scom_write(gcid, scom_base, NPU2_XTS_CFG2, NPU2_MISC_DA_LEN_8B, reg); } static void enable_sm_allocation(uint32_t gcid, uint32_t scom_base, int index) { uint64_t reg, block; int stack = index_to_stack(index); prlog(PR_DEBUG, "OCAPI: %s: Enable State Machine Allocation\n", __func__); /* Step 8 - Enable state-machine allocation */ /* Low-Water Marks Registers - Enable state machine allocation */ for (block = NPU2_BLOCK_SM_0; block <= NPU2_BLOCK_SM_3; block++) { reg = npu2_scom_read(gcid, scom_base, NPU2_REG_OFFSET(stack, block, NPU2_LOW_WATER_MARKS), NPU2_MISC_DA_LEN_8B); reg |= NPU2_LOW_WATER_MARKS_ENABLE_MACHINE_ALLOC; npu2_scom_write(gcid, scom_base, NPU2_REG_OFFSET(stack, block, NPU2_LOW_WATER_MARKS), NPU2_MISC_DA_LEN_8B, reg); } } static void enable_pb_snooping(uint32_t gcid, uint32_t scom_base, int index) { uint64_t reg, block; int stack = index_to_stack(index); prlog(PR_DEBUG, "OCAPI: %s: Enable PowerBus snooping\n", __func__); /* Step 9 - Enable PowerBus snooping */ /* CQ_SM Misc Config Register #0 - Enable PowerBus snooping */ for (block = NPU2_BLOCK_SM_0; block <= NPU2_BLOCK_SM_3; block++) { reg = npu2_scom_read(gcid, scom_base, NPU2_REG_OFFSET(stack, block, NPU2_CQ_SM_MISC_CFG0), NPU2_MISC_DA_LEN_8B); reg |= NPU2_CQ_SM_MISC_CFG0_CONFIG_ENABLE_PBUS; npu2_scom_write(gcid, scom_base, NPU2_REG_OFFSET(stack, block, NPU2_CQ_SM_MISC_CFG0), NPU2_MISC_DA_LEN_8B, reg); } } static void brick_config(uint32_t gcid, uint32_t scom_base, int index) { /* * We assume at this point that the PowerBus Hotplug Mode Control * register is correctly set by Hostboot */ disable_nvlink(gcid, index); set_transport_mux_controls(gcid, scom_base, index, NPU2_DEV_TYPE_OPENCAPI); enable_odl_phy_mux(gcid, index); disable_alink_fp(gcid); enable_xsl_clocks(gcid, scom_base, index); set_npcq_config(gcid, scom_base, index); enable_xsl_xts_interfaces(gcid, scom_base, index); enable_sm_allocation(gcid, scom_base, index); enable_pb_snooping(gcid, scom_base, index); } /* Procedure 13.1.3.4 - Brick to PE Mapping */ static void pe_config(struct npu2_dev *dev) { /* We currently use a fixed PE assignment per brick */ uint64_t val, reg; val = NPU2_MISC_BRICK_BDF2PE_MAP_ENABLE; val = SETFIELD(NPU2_MISC_BRICK_BDF2PE_MAP_PE, val, NPU2_OCAPI_PE(dev)); val = SETFIELD(NPU2_MISC_BRICK_BDF2PE_MAP_BDF, val, 0); reg = NPU2_REG_OFFSET(NPU2_STACK_MISC, NPU2_BLOCK_MISC, NPU2_MISC_BRICK0_BDF2PE_MAP0 + (dev->brick_index * 0x18)); npu2_write(dev->npu, reg, val); } /* Procedure 13.1.3.5 - TL Configuration */ static void tl_config(uint32_t gcid, uint32_t scom_base, uint64_t index) { uint64_t reg; uint64_t stack = index_to_stack(index); uint64_t block = index_to_block(index); prlog(PR_DEBUG, "OCAPI: %s: TL Configuration\n", __func__); /* OTL Config 0 Register */ reg = 0; /* OTL Enable */ reg |= NPU2_OTL_CONFIG0_EN; /* Block PE Handle from ERAT Index */ reg |= NPU2_OTL_CONFIG0_BLOCK_PE_HANDLE; /* OTL Brick ID */ reg = SETFIELD(NPU2_OTL_CONFIG0_BRICKID, reg, index - 2); /* ERAT Hash 0 */ reg = SETFIELD(NPU2_OTL_CONFIG0_ERAT_HASH_0, reg, 0b011001); /* ERAT Hash 1 */ reg = SETFIELD(NPU2_OTL_CONFIG0_ERAT_HASH_1, reg, 0b000111); /* ERAT Hash 2 */ reg = SETFIELD(NPU2_OTL_CONFIG0_ERAT_HASH_2, reg, 0b101100); /* ERAT Hash 3 */ reg = SETFIELD(NPU2_OTL_CONFIG0_ERAT_HASH_3, reg, 0b100110); npu2_scom_write(gcid, scom_base, NPU2_OTL_CONFIG0(stack, block), NPU2_MISC_DA_LEN_8B, reg); /* OTL Config 1 Register */ reg = 0; /* * We leave Template 1-3 bits at 0 to force template 0 as required * for unknown devices. * * Template 0 Transmit Rate is set to most conservative setting which * will always be supported. Other Template Transmit rates are left * unset and will be set later by OS. */ reg = SETFIELD(NPU2_OTL_CONFIG1_TX_TEMP0_RATE, reg, 0b1111); /* Extra wait cycles TXI-TXO */ reg = SETFIELD(NPU2_OTL_CONFIG1_TX_DRDY_WAIT, reg, 0b001); /* Minimum Frequency to Return TLX Credits to AFU */ reg = SETFIELD(NPU2_OTL_CONFIG1_TX_CRET_FREQ, reg, 0b001); /* Frequency to add age to Transmit Requests */ reg = SETFIELD(NPU2_OTL_CONFIG1_TX_AGE_FREQ, reg, 0b11000); /* Response High Priority Threshold */ reg = SETFIELD(NPU2_OTL_CONFIG1_TX_RS2_HPWAIT, reg, 0b011011); /* 4-slot Request High Priority Threshold */ reg = SETFIELD(NPU2_OTL_CONFIG1_TX_RQ4_HPWAIT, reg, 0b011011); /* 6-slot Request High Priority */ reg = SETFIELD(NPU2_OTL_CONFIG1_TX_RQ6_HPWAIT, reg, 0b011011); /* Stop the OCAPI Link on Uncorrectable Error * TODO: Confirm final value - disabled for debug */ npu2_scom_write(gcid, scom_base, NPU2_OTL_CONFIG1(stack, block), NPU2_MISC_DA_LEN_8B, reg); /* TLX Credit Configuration Register */ reg = 0; /* VC0/VC3/DCP0/DCP1 credits to send to AFU */ reg = SETFIELD(NPU2_OTL_TLX_CREDITS_VC0_CREDITS, reg, 0x40); reg = SETFIELD(NPU2_OTL_TLX_CREDITS_VC3_CREDITS, reg, 0x40); reg = SETFIELD(NPU2_OTL_TLX_CREDITS_DCP0_CREDITS, reg, 0x80); reg = SETFIELD(NPU2_OTL_TLX_CREDITS_DCP1_CREDITS, reg, 0x80); npu2_scom_write(gcid, scom_base, NPU2_OTL_TLX_CREDITS(stack, block), NPU2_MISC_DA_LEN_8B, reg); } /* Detect Nimbus DD2.0 and DD2.01 */ static int get_nimbus_level(void) { struct proc_chip *chip = next_chip(NULL); if (chip && chip->type == PROC_CHIP_P9_NIMBUS) return chip->ec_level & 0xff; return -1; } /* Procedure 13.1.3.6 - Address Translation Configuration */ static void address_translation_config(uint32_t gcid, uint32_t scom_base, uint64_t index) { int chip_level; uint64_t reg; uint64_t stack = index_to_stack(index); prlog(PR_DEBUG, "OCAPI: %s: Address Translation Configuration\n", __func__); /* PSL_SCNTL_A0 Register */ /* * ERAT shared between multiple AFUs * * The workbook has this bit around the wrong way from the hardware. * * TODO: handle correctly with link ganging */ reg = npu2_scom_read(gcid, scom_base, NPU2_REG_OFFSET(stack, NPU2_BLOCK_XSL, NPU2_XSL_PSL_SCNTL_A0), NPU2_MISC_DA_LEN_8B); reg |= NPU2_XSL_PSL_SCNTL_A0_MULTI_AFU_DIAL; npu2_scom_write(gcid, scom_base, NPU2_REG_OFFSET(stack, NPU2_BLOCK_XSL, NPU2_XSL_PSL_SCNTL_A0), NPU2_MISC_DA_LEN_8B, reg); chip_level = get_nimbus_level(); if (chip_level == 0x20) { /* * Errata HW408041 (section 15.1.10 of NPU workbook) * "RA mismatch when both tlbie and checkout response * are seen in same cycle" */ /* XSL_GP Register - Bloom Filter Disable */ reg = npu2_scom_read(gcid, scom_base, NPU2_REG_OFFSET(stack, NPU2_BLOCK_XSL, NPU2_XSL_GP), NPU2_MISC_DA_LEN_8B); /* To update XSL_GP, we must first write a magic value to it */ npu2_scom_write(gcid, scom_base, NPU2_REG_OFFSET(stack, NPU2_BLOCK_XSL, NPU2_XSL_GP), NPU2_MISC_DA_LEN_8B, 0x0523790323000000UL); reg &= ~NPU2_XSL_GP_BLOOM_FILTER_ENABLE; npu2_scom_write(gcid, scom_base, NPU2_REG_OFFSET(stack, NPU2_BLOCK_XSL, NPU2_XSL_GP), NPU2_MISC_DA_LEN_8B, reg); } if (chip_level == 0x20 || chip_level == 0x21) { /* * DD2.0/2.1 EOA Bug. Fixed in DD2.2 */ reg = 0x32F8000000000001UL; npu2_scom_write(gcid, scom_base, NPU2_REG_OFFSET(stack, NPU2_BLOCK_XSL, NPU2_XSL_DEF), NPU2_MISC_DA_LEN_8B, reg); } } /* TODO: Merge this with NVLink implementation - we don't use the npu2_bar * wrapper for the PHY BARs yet */ static void write_bar(uint32_t gcid, uint32_t scom_base, uint64_t reg, uint64_t addr, uint64_t size) { uint64_t val; int block; switch (NPU2_REG(reg)) { case NPU2_PHY_BAR: val = SETFIELD(NPU2_PHY_BAR_ADDR, 0ul, addr >> 21); val = SETFIELD(NPU2_PHY_BAR_ENABLE, val, 1); break; case NPU2_NTL0_BAR: case NPU2_NTL1_BAR: val = SETFIELD(NPU2_NTL_BAR_ADDR, 0ul, addr >> 16); val = SETFIELD(NPU2_NTL_BAR_SIZE, val, ilog2(size >> 16)); val = SETFIELD(NPU2_NTL_BAR_ENABLE, val, 1); break; case NPU2_GENID_BAR: val = SETFIELD(NPU2_GENID_BAR_ADDR, 0ul, addr >> 16); val = SETFIELD(NPU2_GENID_BAR_ENABLE, val, 1); break; default: val = 0ul; } for (block = NPU2_BLOCK_SM_0; block <= NPU2_BLOCK_SM_3; block++) { npu2_scom_write(gcid, scom_base, NPU2_REG_OFFSET(0, block, reg), NPU2_MISC_DA_LEN_8B, val); prlog(PR_DEBUG, "OCAPI: Setting BAR %llx to %llx\n", NPU2_REG_OFFSET(0, block, reg), val); } } static void setup_global_mmio_bar(uint32_t gcid, uint32_t scom_base, uint64_t reg[]) { uint64_t addr, size; prlog(PR_DEBUG, "OCAPI: patching up PHY0 bar, %s\n", __func__); phys_map_get(gcid, NPU_PHY, 0, &addr, &size); write_bar(gcid, scom_base, NPU2_REG_OFFSET(NPU2_STACK_STCK_2, 0, NPU2_PHY_BAR), addr, size); prlog(PR_DEBUG, "OCAPI: patching up PHY1 bar, %s\n", __func__); phys_map_get(gcid, NPU_PHY, 1, &addr, &size); write_bar(gcid, scom_base, NPU2_REG_OFFSET(NPU2_STACK_STCK_1, 0, NPU2_PHY_BAR), addr, size); prlog(PR_DEBUG, "OCAPI: setup global mmio, %s\n", __func__); phys_map_get(gcid, NPU_REGS, 0, &addr, &size); write_bar(gcid, scom_base, NPU2_REG_OFFSET(NPU2_STACK_STCK_0, 0, NPU2_PHY_BAR), addr, size); reg[0] = addr; reg[1] = size; } /* Procedure 13.1.3.8 - AFU MMIO Range BARs */ static void setup_afu_mmio_bars(uint32_t gcid, uint32_t scom_base, struct npu2_dev *dev) { uint64_t stack = index_to_stack(dev->brick_index); uint64_t offset = index_to_block(dev->brick_index) == NPU2_BLOCK_OTL0 ? NPU2_NTL0_BAR : NPU2_NTL1_BAR; uint64_t pa_offset = index_to_block(dev->brick_index) == NPU2_BLOCK_OTL0 ? NPU2_CQ_CTL_MISC_MMIOPA0_CONFIG : NPU2_CQ_CTL_MISC_MMIOPA1_CONFIG; uint64_t addr, size, reg; prlog(PR_DEBUG, "OCAPI: %s: Setup AFU MMIO BARs\n", __func__); phys_map_get(gcid, NPU_OCAPI_MMIO, dev->brick_index, &addr, &size); prlog(PR_DEBUG, "OCAPI: AFU MMIO set to %llx, size %llx\n", addr, size); write_bar(gcid, scom_base, NPU2_REG_OFFSET(stack, 0, offset), addr, size); dev->bars[0].npu2_bar.base = addr; dev->bars[0].npu2_bar.size = size; reg = SETFIELD(NPU2_CQ_CTL_MISC_MMIOPA_ADDR, 0ull, addr >> 16); reg = SETFIELD(NPU2_CQ_CTL_MISC_MMIOPA_SIZE, reg, ilog2(size >> 16)); prlog(PR_DEBUG, "OCAPI: PA translation %llx\n", reg); npu2_scom_write(gcid, scom_base, NPU2_REG_OFFSET(stack, NPU2_BLOCK_CTL, pa_offset), NPU2_MISC_DA_LEN_8B, reg); } /* Procedure 13.1.3.9 - AFU Config BARs */ static void setup_afu_config_bars(uint32_t gcid, uint32_t scom_base, struct npu2_dev *dev) { uint64_t stack = index_to_stack(dev->brick_index); int stack_num = stack - NPU2_STACK_STCK_0; uint64_t addr, size; prlog(PR_DEBUG, "OCAPI: %s: Setup AFU Config BARs\n", __func__); phys_map_get(gcid, NPU_GENID, stack_num, &addr, &size); prlog(PR_DEBUG, "OCAPI: Assigning GENID BAR: %016llx\n", addr); write_bar(gcid, scom_base, NPU2_REG_OFFSET(stack, 0, NPU2_GENID_BAR), addr, size); dev->bars[1].npu2_bar.base = addr; dev->bars[1].npu2_bar.size = size; } static void otl_enabletx(uint32_t gcid, uint32_t scom_base, struct npu2_dev *dev) { uint64_t stack = index_to_stack(dev->brick_index); uint64_t block = index_to_block(dev->brick_index); uint64_t reg; /* OTL Config 2 Register */ /* Transmit Enable */ OCAPIDBG(dev, "Enabling TX\n"); reg = 0; reg |= NPU2_OTL_CONFIG2_TX_SEND_EN; npu2_scom_write(gcid, scom_base, NPU2_OTL_CONFIG2(stack, block), NPU2_MISC_DA_LEN_8B, reg); reg = npu2_scom_read(gcid, scom_base, NPU2_OTL_VC_CREDITS(stack, block), NPU2_MISC_DA_LEN_8B); OCAPIDBG(dev, "credit counter: %llx\n", reg); /* TODO: Abort if credits are zero */ } static uint8_t get_reset_pin(struct npu2_dev *dev) { uint8_t pin; switch (dev->brick_index) { case 2: pin = platform.ocapi->i2c_reset_brick2; break; case 3: pin = platform.ocapi->i2c_reset_brick3; break; case 4: pin = platform.ocapi->i2c_reset_brick4; break; case 5: pin = platform.ocapi->i2c_reset_brick5; break; default: assert(false); } return pin; } static void assert_adapter_reset(struct npu2_dev *dev) { uint8_t pin, data; int rc; pin = get_reset_pin(dev); /* * set the i2c reset pin in output mode * * On the 9554 device, register 3 is the configuration * register and a pin is in output mode if its value is 0 */ lock(&dev->npu->i2c_lock); dev->npu->i2c_pin_mode &= ~pin; data = dev->npu->i2c_pin_mode; rc = i2c_request_send(dev->npu->i2c_port_id_ocapi, platform.ocapi->i2c_reset_addr, SMBUS_WRITE, 0x3, 1, &data, sizeof(data), 120); if (rc) goto err; /* register 1 controls the signal, reset is active low */ dev->npu->i2c_pin_wr_state &= ~pin; data = dev->npu->i2c_pin_wr_state; rc = i2c_request_send(dev->npu->i2c_port_id_ocapi, platform.ocapi->i2c_reset_addr, SMBUS_WRITE, 0x1, 1, &data, sizeof(data), 120); if (rc) goto err; unlock(&dev->npu->i2c_lock); return; err: unlock(&dev->npu->i2c_lock); /** * @fwts-label OCAPIDeviceResetFailed * @fwts-advice There was an error attempting to send * a reset signal over I2C to the OpenCAPI device. */ OCAPIERR(dev, "Error writing I2C reset signal: %d\n", rc); } static void deassert_adapter_reset(struct npu2_dev *dev) { uint8_t pin, data; int rc; pin = get_reset_pin(dev); lock(&dev->npu->i2c_lock); dev->npu->i2c_pin_wr_state |= pin; data = dev->npu->i2c_pin_wr_state; rc = i2c_request_send(dev->npu->i2c_port_id_ocapi, platform.ocapi->i2c_reset_addr, SMBUS_WRITE, 0x1, 1, &data, sizeof(data), 120); unlock(&dev->npu->i2c_lock); if (rc) { /** * @fwts-label OCAPIDeviceResetFailed * @fwts-advice There was an error attempting to send * a reset signal over I2C to the OpenCAPI device. */ OCAPIERR(dev, "Error writing I2C reset signal: %d\n", rc); } } static void setup_perf_counters(struct npu2_dev *dev) { uint64_t addr, reg, link; /* * setup the DLL perf counters to check CRC errors detected by * the NPU or the adapter. * * Counter 0: link 0/ODL0, CRC error detected by ODL * Counter 1: link 0/ODL0, CRC error detected by DLx * Counter 2: link 1/ODL1, CRC error detected by ODL * Counter 3: link 1/ODL1, CRC error detected by DLx */ if ((dev->brick_index == 2) || (dev->brick_index == 5)) link = 0; else link = 1; addr = OB_DLL_PERF_MONITOR_CONFIG(dev->brick_index); xscom_read(dev->npu->chip_id, addr, ®); if (link == 0) { reg = SETFIELD(OB_DLL_PERF_MONITOR_CONFIG_ENABLE, reg, OB_DLL_PERF_MONITOR_CONFIG_LINK0); reg = SETFIELD(OB_DLL_PERF_MONITOR_CONFIG_ENABLE >> 2, reg, OB_DLL_PERF_MONITOR_CONFIG_LINK0); } else { reg = SETFIELD(OB_DLL_PERF_MONITOR_CONFIG_ENABLE >> 4, reg, OB_DLL_PERF_MONITOR_CONFIG_LINK1); reg = SETFIELD(OB_DLL_PERF_MONITOR_CONFIG_ENABLE >> 6, reg, OB_DLL_PERF_MONITOR_CONFIG_LINK1); } reg = SETFIELD(OB_DLL_PERF_MONITOR_CONFIG_SIZE, reg, OB_DLL_PERF_MONITOR_CONFIG_SIZE16); xscom_write(dev->npu->chip_id, OB_DLL_PERF_MONITOR_CONFIG(dev->brick_index), reg); OCAPIDBG(dev, "perf counter config %llx = %llx\n", addr, reg); addr = OB_DLL_PERF_MONITOR_SELECT(dev->brick_index); xscom_read(dev->npu->chip_id, addr, ®); reg = SETFIELD(OB_DLL_PERF_MONITOR_SELECT_COUNTER >> (link * 16), reg, OB_DLL_PERF_MONITOR_SELECT_CRC_ODL); reg = SETFIELD(OB_DLL_PERF_MONITOR_SELECT_COUNTER >> ((link * 16) + 8), reg, OB_DLL_PERF_MONITOR_SELECT_CRC_DLX); xscom_write(dev->npu->chip_id, addr, reg); OCAPIDBG(dev, "perf counter select %llx = %llx\n", addr, reg); } static void check_perf_counters(struct npu2_dev *dev) { uint64_t addr, reg, link0, link1; addr = OB_DLL_PERF_COUNTER0(dev->brick_index); xscom_read(dev->npu->chip_id, addr, ®); link0 = GETFIELD(PPC_BITMASK(0, 31), reg); link1 = GETFIELD(PPC_BITMASK(32, 63), reg); if (link0 || link1) OCAPIERR(dev, "CRC error count link0=%08llx link1=%08llx\n", link0, link1); } static void set_init_pattern(uint32_t gcid, struct npu2_dev *dev) { uint64_t reg, config_xscom; config_xscom = OB_ODL_CONFIG(dev->brick_index); /* Transmit Pattern A */ xscom_read(gcid, config_xscom, ®); reg = SETFIELD(OB_ODL_CONFIG_TRAIN_MODE, reg, 0b0001); xscom_write(gcid, config_xscom, reg); } static void start_training(uint32_t gcid, struct npu2_dev *dev) { uint64_t reg, config_xscom; config_xscom = OB_ODL_CONFIG(dev->brick_index); /* Start training */ xscom_read(gcid, config_xscom, ®); reg = SETFIELD(OB_ODL_CONFIG_TRAIN_MODE, reg, 0b1000); xscom_write(gcid, config_xscom, reg); } static int64_t npu2_opencapi_get_presence_state(struct pci_slot __unused *slot, uint8_t *val) { /* * Presence detection for OpenCAPI is currently done at the start of * NPU initialisation, and we only create slots if a device is present. * As such we will never be asked to get the presence of a slot that's * empty. * * This may change if we ever support surprise hotplug down * the track. */ *val = OPAL_PCI_SLOT_PRESENT; return OPAL_SUCCESS; } static void fence_brick(struct npu2_dev *dev) { OCAPIDBG(dev, "Fencing brick\n"); set_fence_control(dev->npu->chip_id, dev->npu->xscom_base, dev->brick_index, 0b11); /* from 13.2.1, Quiesce Fence State */ npu2_write(dev->npu, NPU2_MISC_FENCE_STATE, PPC_BIT(dev->brick_index + 6)); } static void unfence_brick(struct npu2_dev *dev) { OCAPIDBG(dev, "Unfencing brick\n"); npu2_write(dev->npu, NPU2_MISC_FENCE_STATE, PPC_BIT(dev->brick_index)); set_fence_control(dev->npu->chip_id, dev->npu->xscom_base, dev->brick_index, 0b10); set_fence_control(dev->npu->chip_id, dev->npu->xscom_base, dev->brick_index, 0b00); } static enum OpalShpcLinkState get_link_width(uint64_t odl_status) { uint64_t tx_lanes, rx_lanes, state; /* * On P9, the 'trained mode' field of the ODL status is * hard-coded to x8 and is useless for us. We need to look at * the status of the individual lanes. * The link trains at x8, x4 or not at all. */ state = GETFIELD(OB_ODL_STATUS_TRAINING_STATE_MACHINE, odl_status); if (state != OCAPI_LINK_STATE_TRAINED) return OPAL_SHPC_LINK_DOWN; rx_lanes = GETFIELD(OB_ODL_STATUS_RX_TRAINED_LANES, odl_status); tx_lanes = GETFIELD(OB_ODL_STATUS_TX_TRAINED_LANES, odl_status); if ((rx_lanes != 0xFF) || (tx_lanes != 0xFF)) return OPAL_SHPC_LINK_UP_x4; else return OPAL_SHPC_LINK_UP_x8; } static int64_t npu2_opencapi_get_link_state(struct pci_slot *slot, uint8_t *val) { struct npu2_dev *dev = phb_to_npu2_dev_ocapi(slot->phb); uint64_t reg; reg = get_odl_status(dev->npu->chip_id, dev->brick_index); *val = get_link_width(reg); return OPAL_SUCCESS; } static int64_t npu2_opencapi_get_power_state(struct pci_slot *slot, uint8_t *val) { *val = slot->power_state; return OPAL_SUCCESS; } static int64_t npu2_opencapi_set_power_state(struct pci_slot *slot, uint8_t val) { struct npu2_dev *dev = phb_to_npu2_dev_ocapi(slot->phb); switch (val) { case PCI_SLOT_POWER_OFF: OCAPIDBG(dev, "Fake power off\n"); fence_brick(dev); assert_adapter_reset(dev); slot->power_state = PCI_SLOT_POWER_OFF; return OPAL_SUCCESS; case PCI_SLOT_POWER_ON: if (slot->power_state != PCI_SLOT_POWER_OFF) return OPAL_SUCCESS; OCAPIDBG(dev, "Fake power on\n"); slot->power_state = PCI_SLOT_POWER_ON; slot->state = OCAPI_SLOT_NORMAL; return OPAL_SUCCESS; default: return OPAL_UNSUPPORTED; } } static void check_trained_link(struct npu2_dev *dev, uint64_t odl_status) { if (get_link_width(odl_status) != OPAL_SHPC_LINK_UP_x8) { OCAPIERR(dev, "Link trained in degraded mode (%016llx)\n", odl_status); OCAPIDBG(dev, "Link endpoint info: %016llx\n", get_odl_endpoint_info(dev->npu->chip_id, dev->brick_index)); } } static int64_t npu2_opencapi_retry_state(struct pci_slot *slot, uint64_t odl_status) { struct npu2_dev *dev = phb_to_npu2_dev_ocapi(slot->phb); uint32_t chip_id = dev->npu->chip_id; if (!slot->link_retries--) { /** * @fwts-label OCAPILinkTrainingFailed * @fwts-advice The OpenCAPI link training procedure failed. * This indicates a hardware or firmware bug. OpenCAPI * functionality will not be available on this link. */ OCAPIERR(dev, "Link failed to train, final link status: %016llx\n", odl_status); OCAPIDBG(dev, "Final link training status: %016llx\n", get_odl_training_status(chip_id, dev->brick_index)); return OPAL_HARDWARE; } OCAPIERR(dev, "Link failed to train, retrying\n"); OCAPIDBG(dev, "Link status: %016llx, training status: %016llx\n", odl_status, get_odl_training_status(chip_id, dev->brick_index)); pci_slot_set_state(slot, OCAPI_SLOT_FRESET_INIT); return pci_slot_set_sm_timeout(slot, msecs_to_tb(1)); } static void npu2_opencapi_prepare_link_change(struct pci_slot *slot __unused, bool up __unused) { /* * PCI hotplug wants it defined, but we don't need to do anything */ } static int64_t npu2_opencapi_poll_link(struct pci_slot *slot) { struct npu2_dev *dev = phb_to_npu2_dev_ocapi(slot->phb); uint32_t chip_id = dev->npu->chip_id; uint64_t reg; switch (slot->state) { case OCAPI_SLOT_NORMAL: case OCAPI_SLOT_LINK_START: OCAPIDBG(dev, "Start polling\n"); pci_slot_set_state(slot, OCAPI_SLOT_LINK_WAIT); /* fall-through */ case OCAPI_SLOT_LINK_WAIT: reg = get_odl_status(chip_id, dev->brick_index); if (GETFIELD(OB_ODL_STATUS_TRAINING_STATE_MACHINE, reg) == OCAPI_LINK_STATE_TRAINED) { OCAPIINF(dev, "link trained in %ld ms\n", tb_to_msecs(mftb() - dev->train_start)); check_trained_link(dev, reg); pci_slot_set_state(slot, OCAPI_SLOT_LINK_TRAINED); return pci_slot_set_sm_timeout(slot, msecs_to_tb(1)); } if (tb_compare(mftb(), dev->train_timeout) == TB_AAFTERB) return npu2_opencapi_retry_state(slot, reg); return pci_slot_set_sm_timeout(slot, msecs_to_tb(1)); case OCAPI_SLOT_LINK_TRAINED: otl_enabletx(chip_id, dev->npu->xscom_base, dev); pci_slot_set_state(slot, OCAPI_SLOT_NORMAL); if (dev->flags & NPU2_DEV_BROKEN) { OCAPIERR(dev, "Resetting a device which hit a previous error. Device recovery is not supported, so future behavior is undefined\n"); dev->flags &= ~NPU2_DEV_BROKEN; } check_perf_counters(dev); dev->phb_ocapi.scan_map = 1; return OPAL_SUCCESS; default: OCAPIERR(dev, "unexpected slot state %08x\n", slot->state); } pci_slot_set_state(slot, OCAPI_SLOT_NORMAL); return OPAL_HARDWARE; } static int64_t npu2_opencapi_creset(struct pci_slot *slot) { struct npu2_dev *dev = phb_to_npu2_dev_ocapi(slot->phb); OCAPIERR(dev, "creset not supported\n"); return OPAL_UNSUPPORTED; } static int64_t npu2_opencapi_freset(struct pci_slot *slot) { struct npu2_dev *dev = phb_to_npu2_dev_ocapi(slot->phb); uint32_t chip_id = dev->npu->chip_id; uint8_t presence = 1; int rc; switch (slot->state) { case OCAPI_SLOT_NORMAL: case OCAPI_SLOT_FRESET_START: OCAPIDBG(dev, "FRESET starts\n"); if (slot->ops.get_presence_state) slot->ops.get_presence_state(slot, &presence); if (!presence) { /* * FIXME: if there's no card on the link, we * should consider powering off the unused * lanes to save energy */ OCAPIINF(dev, "no card detected\n"); return OPAL_SUCCESS; } slot->link_retries = OCAPI_LINK_TRAINING_RETRIES; /* fall-through */ case OCAPI_SLOT_FRESET_INIT: fence_brick(dev); assert_odl_reset(chip_id, dev->brick_index); assert_adapter_reset(dev); pci_slot_set_state(slot, OCAPI_SLOT_FRESET_ASSERT_DELAY); /* assert for 5ms */ return pci_slot_set_sm_timeout(slot, msecs_to_tb(5)); case OCAPI_SLOT_FRESET_ASSERT_DELAY: rc = npu2_opencapi_phy_reset(dev); if (rc) { OCAPIERR(dev, "FRESET: couldn't reset PHY state\n"); return OPAL_HARDWARE; } deassert_odl_reset(chip_id, dev->brick_index); deassert_adapter_reset(dev); pci_slot_set_state(slot, OCAPI_SLOT_FRESET_DEASSERT_DELAY); /* give 250ms to device to be ready */ return pci_slot_set_sm_timeout(slot, msecs_to_tb(250)); case OCAPI_SLOT_FRESET_DEASSERT_DELAY: unfence_brick(dev); set_init_pattern(chip_id, dev); pci_slot_set_state(slot, OCAPI_SLOT_FRESET_INIT_DELAY); return pci_slot_set_sm_timeout(slot, msecs_to_tb(5)); case OCAPI_SLOT_FRESET_INIT_DELAY: /* Bump lanes - this improves training reliability */ npu2_opencapi_bump_ui_lane(dev); start_training(chip_id, dev); dev->train_start = mftb(); dev->train_timeout = dev->train_start + msecs_to_tb(OCAPI_LINK_TRAINING_TIMEOUT); pci_slot_set_state(slot, OCAPI_SLOT_LINK_START); return slot->ops.poll_link(slot); default: OCAPIERR(dev, "FRESET: unexpected slot state %08x\n", slot->state); } pci_slot_set_state(slot, OCAPI_SLOT_NORMAL); return OPAL_HARDWARE; } static int64_t npu2_opencapi_hreset(struct pci_slot *slot __unused) { struct npu2_dev *dev = phb_to_npu2_dev_ocapi(slot->phb); OCAPIERR(dev, "hreset not supported\n"); return OPAL_UNSUPPORTED; } static void make_slot_hotpluggable(struct pci_slot *slot, struct phb *phb) { char label[40]; /* * Add a few definitions to the DT so that the linux PCI * hotplug framework can find the slot and identify it as * hot-pluggable. * * The "ibm,slot-label" property is used by linux as the slot name */ slot->pluggable = 1; pci_slot_add_dt_properties(slot, phb->dt_node); snprintf(label, sizeof(label), "OPENCAPI-%04x", (int)PCI_SLOT_PHB_INDEX(slot->id)); dt_add_property_string(phb->dt_node, "ibm,slot-label", label); } static struct pci_slot *npu2_opencapi_slot_create(struct phb *phb) { struct pci_slot *slot; slot = pci_slot_alloc(phb, NULL); if (!slot) return slot; /* TODO: Figure out other slot functions */ slot->ops.get_presence_state = npu2_opencapi_get_presence_state; slot->ops.get_link_state = npu2_opencapi_get_link_state; slot->ops.get_power_state = npu2_opencapi_get_power_state; slot->ops.get_attention_state = NULL; slot->ops.get_latch_state = NULL; slot->ops.set_power_state = npu2_opencapi_set_power_state; slot->ops.set_attention_state = NULL; slot->ops.prepare_link_change = npu2_opencapi_prepare_link_change; slot->ops.poll_link = npu2_opencapi_poll_link; slot->ops.creset = npu2_opencapi_creset; slot->ops.freset = npu2_opencapi_freset; slot->ops.hreset = npu2_opencapi_hreset; return slot; } static int64_t npu2_opencapi_pcicfg_check(struct npu2_dev *dev, uint32_t offset, uint32_t size) { if (!dev || offset > 0xfff || (offset & (size - 1))) return OPAL_PARAMETER; return OPAL_SUCCESS; } static int64_t npu2_opencapi_pcicfg_read(struct phb *phb, uint32_t bdfn, uint32_t offset, uint32_t size, void *data) { uint64_t cfg_addr; struct npu2_dev *dev = phb_to_npu2_dev_ocapi(phb); uint64_t genid_base; int64_t rc; rc = npu2_opencapi_pcicfg_check(dev, offset, size); if (rc) return rc; genid_base = dev->bars[1].npu2_bar.base + (index_to_block(dev->brick_index) == NPU2_BLOCK_OTL1 ? 256 : 0); cfg_addr = NPU2_CQ_CTL_CONFIG_ADDR_ENABLE; cfg_addr = SETFIELD(NPU2_CQ_CTL_CONFIG_ADDR_BUS_NUMBER | NPU2_CQ_CTL_CONFIG_ADDR_DEVICE_NUMBER | NPU2_CQ_CTL_CONFIG_ADDR_FUNCTION_NUMBER, cfg_addr, bdfn); cfg_addr = SETFIELD(NPU2_CQ_CTL_CONFIG_ADDR_REGISTER_NUMBER, cfg_addr, offset & ~3u); out_be64((uint64_t *)genid_base, cfg_addr); sync(); switch (size) { case 1: *((uint8_t *)data) = in_8((volatile uint8_t *)(genid_base + 128 + (offset & 3))); break; case 2: *((uint16_t *)data) = in_le16((volatile uint16_t *)(genid_base + 128 + (offset & 2))); break; case 4: *((uint32_t *)data) = in_le32((volatile uint32_t *)(genid_base + 128)); break; default: return OPAL_PARAMETER; } return OPAL_SUCCESS; } #define NPU2_OPENCAPI_PCI_CFG_READ(size, type) \ static int64_t npu2_opencapi_pcicfg_read##size(struct phb *phb, \ uint32_t bdfn, \ uint32_t offset, \ type *data) \ { \ /* Initialize data in case of error */ \ *data = (type)0xffffffff; \ return npu2_opencapi_pcicfg_read(phb, bdfn, offset, \ sizeof(type), data); \ } static int64_t npu2_opencapi_pcicfg_write(struct phb *phb, uint32_t bdfn, uint32_t offset, uint32_t size, uint32_t data) { uint64_t cfg_addr; struct npu2_dev *dev = phb_to_npu2_dev_ocapi(phb); uint64_t genid_base; int64_t rc; rc = npu2_opencapi_pcicfg_check(dev, offset, size); if (rc) return rc; genid_base = dev->bars[1].npu2_bar.base + (index_to_block(dev->brick_index) == NPU2_BLOCK_OTL1 ? 256 : 0); cfg_addr = NPU2_CQ_CTL_CONFIG_ADDR_ENABLE; cfg_addr = SETFIELD(NPU2_CQ_CTL_CONFIG_ADDR_BUS_NUMBER | NPU2_CQ_CTL_CONFIG_ADDR_DEVICE_NUMBER | NPU2_CQ_CTL_CONFIG_ADDR_FUNCTION_NUMBER, cfg_addr, bdfn); cfg_addr = SETFIELD(NPU2_CQ_CTL_CONFIG_ADDR_REGISTER_NUMBER, cfg_addr, offset & ~3u); out_be64((uint64_t *)genid_base, cfg_addr); sync(); switch (size) { case 1: out_8((volatile uint8_t *)(genid_base + 128 + (offset & 3)), data); break; case 2: out_le16((volatile uint16_t *)(genid_base + 128 + (offset & 2)), data); break; case 4: out_le32((volatile uint32_t *)(genid_base + 128), data); break; default: return OPAL_PARAMETER; } return OPAL_SUCCESS; } #define NPU2_OPENCAPI_PCI_CFG_WRITE(size, type) \ static int64_t npu2_opencapi_pcicfg_write##size(struct phb *phb, \ uint32_t bdfn, \ uint32_t offset, \ type data) \ { \ return npu2_opencapi_pcicfg_write(phb, bdfn, offset, \ sizeof(type), data); \ } NPU2_OPENCAPI_PCI_CFG_READ(8, u8) NPU2_OPENCAPI_PCI_CFG_READ(16, u16) NPU2_OPENCAPI_PCI_CFG_READ(32, u32) NPU2_OPENCAPI_PCI_CFG_WRITE(8, u8) NPU2_OPENCAPI_PCI_CFG_WRITE(16, u16) NPU2_OPENCAPI_PCI_CFG_WRITE(32, u32) static int64_t npu2_opencapi_ioda_reset(struct phb __unused *phb, bool __unused purge) { /* Not relevant to OpenCAPI - we do this just to silence the error */ return OPAL_SUCCESS; } static int64_t npu2_opencapi_set_pe(struct phb *phb, uint64_t pe_num, uint64_t __unused bdfn, uint8_t __unused bcompare, uint8_t __unused dcompare, uint8_t __unused fcompare, uint8_t action) { struct npu2_dev *dev = phb_to_npu2_dev_ocapi(phb); /* * Ignored on OpenCAPI - we use fixed PE assignments. May need * addressing when we support dual-link devices. * * We nonetheless store the PE reported by the OS so that we * can send it back in case of error. If there are several PCI * functions on the device, the OS can define many PEs, we * only keep one, the OS will handle it. */ if (action != OPAL_MAP_PE && action != OPAL_UNMAP_PE) return OPAL_PARAMETER; if (action == OPAL_UNMAP_PE) pe_num = -1; dev->linux_pe = pe_num; return OPAL_SUCCESS; } static int64_t npu2_opencapi_freeze_status(struct phb *phb __unused, uint64_t pe_number __unused, uint8_t *freeze_state, uint16_t *pci_error_type, uint16_t *severity) { *freeze_state = OPAL_EEH_STOPPED_NOT_FROZEN; *pci_error_type = OPAL_EEH_NO_ERROR; if (severity) *severity = OPAL_EEH_SEV_NO_ERROR; return OPAL_SUCCESS; } static int64_t npu2_opencapi_eeh_next_error(struct phb *phb, uint64_t *first_frozen_pe, uint16_t *pci_error_type, uint16_t *severity) { struct npu2_dev *dev = phb_to_npu2_dev_ocapi(phb); if (!first_frozen_pe || !pci_error_type || !severity) return OPAL_PARAMETER; if (dev->flags & NPU2_DEV_BROKEN) { OCAPIDBG(dev, "Reporting device as broken\n"); *first_frozen_pe = dev->linux_pe; *pci_error_type = OPAL_EEH_PHB_ERROR; *severity = OPAL_EEH_SEV_PHB_DEAD; } else { *first_frozen_pe = -1; *pci_error_type = OPAL_EEH_NO_ERROR; *severity = OPAL_EEH_SEV_NO_ERROR; } return OPAL_SUCCESS; } static int npu2_add_mmio_regs(struct phb *phb, struct pci_device *pd, void *data __unused) { uint32_t irq; struct npu2_dev *dev = phb_to_npu2_dev_ocapi(phb); uint64_t block = index_to_block(dev->brick_index); uint64_t stacku = index_to_stacku(dev->brick_index); uint64_t dsisr, dar, tfc, handle; /* * Pass the hw irq number for the translation fault irq * irq levels 23 -> 26 are for translation faults, 1 per brick */ irq = dev->npu->base_lsi + NPU_IRQ_LEVELS_XSL; if (stacku == NPU2_STACK_STCK_2U) irq += 2; if (block == NPU2_BLOCK_OTL1) irq++; /* * Add the addresses of the registers needed by the OS to handle * faults. The OS accesses them by mmio. */ dsisr = (uint64_t) dev->npu->regs + NPU2_OTL_OSL_DSISR(stacku, block); dar = (uint64_t) dev->npu->regs + NPU2_OTL_OSL_DAR(stacku, block); tfc = (uint64_t) dev->npu->regs + NPU2_OTL_OSL_TFC(stacku, block); handle = (uint64_t) dev->npu->regs + NPU2_OTL_OSL_PEHANDLE(stacku, block); dt_add_property_cells(pd->dn, "ibm,opal-xsl-irq", irq); dt_add_property_cells(pd->dn, "ibm,opal-xsl-mmio", hi32(dsisr), lo32(dsisr), hi32(dar), lo32(dar), hi32(tfc), lo32(tfc), hi32(handle), lo32(handle)); return 0; } static void npu2_opencapi_final_fixup(struct phb *phb) { pci_walk_dev(phb, NULL, npu2_add_mmio_regs, NULL); } static void mask_nvlink_fir(struct npu2 *p) { uint64_t reg; /* * From section 13.1.3.10 of the NPU workbook: "the NV-Link * Datalink Layer Stall and NoStall signals are used for a * different purpose when the link is configured for * OpenCAPI. Therefore, the corresponding bits in NPU FIR * Register 1 must be masked and configured to NOT cause the * NPU to go into Freeze or Fence mode or send an Interrupt." * * FIXME: will need to revisit when mixing nvlink with * opencapi. Assumes an opencapi-only setup on both PHYs for * now. */ /* Mask FIRs */ xscom_read(p->chip_id, p->xscom_base + NPU2_MISC_FIR1_MASK, ®); reg = SETFIELD(PPC_BITMASK(0, 11), reg, 0xFFF); xscom_write(p->chip_id, p->xscom_base + NPU2_MISC_FIR1_MASK, reg); /* freeze disable */ reg = npu2_scom_read(p->chip_id, p->xscom_base, NPU2_MISC_FREEZE_ENABLE1, NPU2_MISC_DA_LEN_8B); reg = SETFIELD(PPC_BITMASK(0, 11), reg, 0); npu2_scom_write(p->chip_id, p->xscom_base, NPU2_MISC_FREEZE_ENABLE1, NPU2_MISC_DA_LEN_8B, reg); /* fence disable */ reg = npu2_scom_read(p->chip_id, p->xscom_base, NPU2_MISC_FENCE_ENABLE1, NPU2_MISC_DA_LEN_8B); reg = SETFIELD(PPC_BITMASK(0, 11), reg, 0); npu2_scom_write(p->chip_id, p->xscom_base, NPU2_MISC_FENCE_ENABLE1, NPU2_MISC_DA_LEN_8B, reg); /* irq disable */ reg = npu2_scom_read(p->chip_id, p->xscom_base, NPU2_MISC_IRQ_ENABLE1, NPU2_MISC_DA_LEN_8B); reg = SETFIELD(PPC_BITMASK(0, 11), reg, 0); npu2_scom_write(p->chip_id, p->xscom_base, NPU2_MISC_IRQ_ENABLE1, NPU2_MISC_DA_LEN_8B, reg); } static int enable_interrupts(struct npu2 *p) { uint64_t reg, xsl_fault, xstop_override, xsl_mask; /* * We need to: * - enable translation interrupts for all bricks * - override most brick-fatal errors from FIR2 to send an * interrupt instead of the default action of checkstopping * the systems, since we can just fence the brick and keep * the system alive. * - the exception to the above is 2 FIRs for XSL errors * resulting of bad AFU behavior, for which we don't want to * checkstop but can't configure to send an error interrupt * either, as the XSL errors are reported on 2 links (the * XSL is shared between 2 links). Instead, we mask * them. The XSL errors will result in an OTL error, which * is reported only once, for the correct link. * * FIR bits configured to trigger an interrupt must have their * default action masked */ xsl_fault = PPC_BIT(0) | PPC_BIT(1) | PPC_BIT(2) | PPC_BIT(3); xstop_override = 0x0FFFEFC00F91B000; xsl_mask = PPC_BIT(41) | PPC_BIT(42); xscom_read(p->chip_id, p->xscom_base + NPU2_MISC_FIR2_MASK, ®); reg |= xsl_fault | xstop_override | xsl_mask; xscom_write(p->chip_id, p->xscom_base + NPU2_MISC_FIR2_MASK, reg); reg = npu2_scom_read(p->chip_id, p->xscom_base, NPU2_MISC_IRQ_ENABLE2, NPU2_MISC_DA_LEN_8B); reg |= xsl_fault | xstop_override; npu2_scom_write(p->chip_id, p->xscom_base, NPU2_MISC_IRQ_ENABLE2, NPU2_MISC_DA_LEN_8B, reg); /* * Make sure the brick is fenced on those errors. * Fencing is incompatible with freezing, but there's no * freeze defined for FIR2, so we don't have to worry about it */ reg = npu2_scom_read(p->chip_id, p->xscom_base, NPU2_MISC_FENCE_ENABLE2, NPU2_MISC_DA_LEN_8B); reg |= xstop_override; npu2_scom_write(p->chip_id, p->xscom_base, NPU2_MISC_FENCE_ENABLE2, NPU2_MISC_DA_LEN_8B, reg); mask_nvlink_fir(p); return 0; } static void setup_debug_training_state(struct npu2_dev *dev) { npu2_opencapi_phy_reset(dev); switch (npu2_ocapi_training_state) { case NPU2_TRAIN_PRBS31: OCAPIINF(dev, "sending PRBS31 pattern per NVRAM setting\n"); npu2_opencapi_phy_prbs31(dev); break; case NPU2_TRAIN_NONE: OCAPIINF(dev, "link not trained per NVRAM setting\n"); break; default: assert(false); } } static void setup_device(struct npu2_dev *dev) { struct dt_node *dn_phb; struct pci_slot *slot; uint64_t mm_win[2]; /* Populate PHB device node */ phys_map_get(dev->npu->chip_id, NPU_OCAPI_MMIO, dev->brick_index, &mm_win[0], &mm_win[1]); prlog(PR_DEBUG, "OCAPI: Setting MMIO window to %016llx + %016llx\n", mm_win[0], mm_win[1]); dn_phb = dt_new_addr(dt_root, "pciex", mm_win[0]); assert(dn_phb); dt_add_property_strings(dn_phb, "compatible", "ibm,power9-npu-opencapi-pciex", "ibm,ioda2-npu2-opencapi-phb"); dt_add_property_cells(dn_phb, "#address-cells", 3); dt_add_property_cells(dn_phb, "#size-cells", 2); dt_add_property_cells(dn_phb, "#interrupt-cells", 1); dt_add_property_cells(dn_phb, "bus-range", 0, 0xff); dt_add_property_cells(dn_phb, "clock-frequency", 0x200, 0); dt_add_property_cells(dn_phb, "interrupt-parent", get_ics_phandle()); dt_add_property_strings(dn_phb, "device_type", "pciex"); dt_add_property(dn_phb, "reg", mm_win, sizeof(mm_win)); dt_add_property_cells(dn_phb, "ibm,npu-index", dev->npu->index); dt_add_property_cells(dn_phb, "ibm,chip-id", dev->npu->chip_id); dt_add_property_cells(dn_phb, "ibm,xscom-base", dev->npu->xscom_base); dt_add_property_cells(dn_phb, "ibm,npcq", dev->npu->dt_node->phandle); dt_add_property_cells(dn_phb, "ibm,links", 1); dt_add_property(dn_phb, "ibm,mmio-window", mm_win, sizeof(mm_win)); dt_add_property_cells(dn_phb, "ibm,phb-diag-data-size", 0); /* * We ignore whatever PE numbers Linux tries to set, so we just * advertise enough that Linux won't complain */ dt_add_property_cells(dn_phb, "ibm,opal-num-pes", NPU2_MAX_PE_NUM); dt_add_property_cells(dn_phb, "ibm,opal-reserved-pe", NPU2_RESERVED_PE_NUM); dt_add_property_cells(dn_phb, "ranges", 0x02000000, hi32(mm_win[0]), lo32(mm_win[0]), hi32(mm_win[0]), lo32(mm_win[0]), hi32(mm_win[1]), lo32(mm_win[1])); dev->phb_ocapi.dt_node = dn_phb; dev->phb_ocapi.ops = &npu2_opencapi_ops; dev->phb_ocapi.phb_type = phb_type_npu_v2_opencapi; dev->phb_ocapi.scan_map = 0; dev->bdfn = 0; dev->linux_pe = -1; /* TODO: Procedure 13.1.3.7 - AFU Memory Range BARs */ /* Procedure 13.1.3.8 - AFU MMIO Range BARs */ setup_afu_mmio_bars(dev->npu->chip_id, dev->npu->xscom_base, dev); /* Procedure 13.1.3.9 - AFU Config BARs */ setup_afu_config_bars(dev->npu->chip_id, dev->npu->xscom_base, dev); setup_perf_counters(dev); npu2_opencapi_phy_init(dev); set_fence_control(dev->npu->chip_id, dev->npu->xscom_base, dev->brick_index, 0b00); pci_register_phb(&dev->phb_ocapi, OPAL_DYNAMIC_PHB_ID); if (npu2_ocapi_training_state != NPU2_TRAIN_DEFAULT) { setup_debug_training_state(dev); } else { slot = npu2_opencapi_slot_create(&dev->phb_ocapi); if (!slot) { /** * @fwts-label OCAPICannotCreatePHBSlot * @fwts-advice Firmware probably ran out of memory creating * NPU slot. OpenCAPI functionality could be broken. */ prlog(PR_ERR, "OCAPI: Cannot create PHB slot\n"); } make_slot_hotpluggable(slot, &dev->phb_ocapi); } return; } static void read_nvram_training_state(void) { const char *state; state = nvram_query_dangerous("opencapi-link-training"); if (state) { if (!strcmp(state, "prbs31")) npu2_ocapi_training_state = NPU2_TRAIN_PRBS31; else if (!strcmp(state, "none")) npu2_ocapi_training_state = NPU2_TRAIN_NONE; else prlog(PR_WARNING, "OCAPI: invalid training state in NVRAM: %s\n", state); } } int npu2_opencapi_init_npu(struct npu2 *npu) { struct npu2_dev *dev; uint64_t reg[2]; assert(platform.ocapi); read_nvram_training_state(); /* TODO: Test OpenCAPI with fast reboot and make it work */ disable_fast_reboot("OpenCAPI device enabled"); setup_global_mmio_bar(npu->chip_id, npu->xscom_base, reg); npu->regs = (void *)reg[0]; for (int i = 0; i < npu->total_devices; i++) { dev = &npu->devices[i]; if (dev->type != NPU2_DEV_TYPE_OPENCAPI) continue; prlog(PR_INFO, "OCAPI: Configuring link index %d, brick %d\n", dev->link_index, dev->brick_index); /* Procedure 13.1.3.1 - Select OCAPI vs NVLink */ brick_config(npu->chip_id, npu->xscom_base, dev->brick_index); /* Procedure 13.1.3.4 - Brick to PE Mapping */ pe_config(dev); /* Procedure 13.1.3.5 - Transaction Layer Configuration */ tl_config(npu->chip_id, npu->xscom_base, dev->brick_index); /* Procedure 13.1.3.6 - Address Translation Configuration */ address_translation_config(npu->chip_id, npu->xscom_base, dev->brick_index); } enable_interrupts(npu); for (int i = 0; i < npu->total_devices; i++) { dev = &npu->devices[i]; if (dev->type != NPU2_DEV_TYPE_OPENCAPI) continue; setup_device(dev); } return 0; } static const struct phb_ops npu2_opencapi_ops = { .cfg_read8 = npu2_opencapi_pcicfg_read8, .cfg_read16 = npu2_opencapi_pcicfg_read16, .cfg_read32 = npu2_opencapi_pcicfg_read32, .cfg_write8 = npu2_opencapi_pcicfg_write8, .cfg_write16 = npu2_opencapi_pcicfg_write16, .cfg_write32 = npu2_opencapi_pcicfg_write32, .device_init = NULL, .phb_final_fixup = npu2_opencapi_final_fixup, .ioda_reset = npu2_opencapi_ioda_reset, .papr_errinjct_reset = NULL, .pci_reinit = NULL, .set_phb_mem_window = NULL, .phb_mmio_enable = NULL, .map_pe_mmio_window = NULL, .map_pe_dma_window = NULL, .map_pe_dma_window_real = NULL, .pci_msi_eoi = NULL, .set_xive_pe = NULL, .get_msi_32 = NULL, .get_msi_64 = NULL, .set_pe = npu2_opencapi_set_pe, .set_peltv = NULL, .eeh_freeze_status = npu2_opencapi_freeze_status, .eeh_freeze_clear = NULL, .eeh_freeze_set = NULL, .next_error = npu2_opencapi_eeh_next_error, .err_inject = NULL, .get_diag_data2 = NULL, .set_capi_mode = NULL, .set_capp_recovery = NULL, .tce_kill = NULL, }; void npu2_opencapi_set_broken(struct npu2 *npu, int brick) { struct phb *phb; struct npu2_dev *dev; for_each_phb(phb) { if (phb->phb_type == phb_type_npu_v2_opencapi) { dev = phb_to_npu2_dev_ocapi(phb); if (dev->npu == npu && dev->brick_index == brick) dev->flags |= NPU2_DEV_BROKEN; } } } static int64_t opal_npu_spa_setup(uint64_t phb_id, uint32_t __unused bdfn, uint64_t addr, uint64_t PE_mask) { uint64_t stack, block, offset, reg; struct phb *phb = pci_get_phb(phb_id); struct npu2_dev *dev; int rc; if (!phb || phb->phb_type != phb_type_npu_v2_opencapi) return OPAL_PARAMETER; /* 4k aligned */ if (addr & 0xFFF) return OPAL_PARAMETER; if (PE_mask > 15) return OPAL_PARAMETER; dev = phb_to_npu2_dev_ocapi(phb); if (!dev) return OPAL_PARAMETER; block = index_to_block(dev->brick_index); stack = index_to_stack(dev->brick_index); if (block == NPU2_BLOCK_OTL1) offset = NPU2_XSL_PSL_SPAP_A1; else offset = NPU2_XSL_PSL_SPAP_A0; lock(&dev->npu->lock); /* * set the SPAP used by the device */ reg = npu2_scom_read(dev->npu->chip_id, dev->npu->xscom_base, NPU2_REG_OFFSET(stack, NPU2_BLOCK_XSL, offset), NPU2_MISC_DA_LEN_8B); if ((addr && (reg & NPU2_XSL_PSL_SPAP_EN)) || (!addr && !(reg & NPU2_XSL_PSL_SPAP_EN))) { rc = OPAL_BUSY; goto out; } /* SPA is disabled by passing a NULL address */ reg = addr; if (addr) reg = addr | NPU2_XSL_PSL_SPAP_EN; npu2_scom_write(dev->npu->chip_id, dev->npu->xscom_base, NPU2_REG_OFFSET(stack, NPU2_BLOCK_XSL, offset), NPU2_MISC_DA_LEN_8B, reg); /* * set the PE mask that the OS uses for PASID -> PE handle * conversion */ reg = npu2_scom_read(dev->npu->chip_id, dev->npu->xscom_base, NPU2_OTL_CONFIG0(stack, block), NPU2_MISC_DA_LEN_8B); reg &= ~NPU2_OTL_CONFIG0_PE_MASK; reg |= (PE_mask << (63-7)); npu2_scom_write(dev->npu->chip_id, dev->npu->xscom_base, NPU2_OTL_CONFIG0(stack, block), NPU2_MISC_DA_LEN_8B, reg); rc = OPAL_SUCCESS; out: unlock(&dev->npu->lock); return rc; } opal_call(OPAL_NPU_SPA_SETUP, opal_npu_spa_setup, 4); static int64_t opal_npu_spa_clear_cache(uint64_t phb_id, uint32_t __unused bdfn, uint64_t PE_handle) { uint64_t cc_inv, stack, block, reg, rc; uint32_t retries = 5; struct phb *phb = pci_get_phb(phb_id); struct npu2_dev *dev; if (!phb || phb->phb_type != phb_type_npu_v2_opencapi) return OPAL_PARAMETER; if (PE_handle > MAX_PE_HANDLE) return OPAL_PARAMETER; dev = phb_to_npu2_dev_ocapi(phb); if (!dev) return OPAL_PARAMETER; block = index_to_block(dev->brick_index); stack = index_to_stack(dev->brick_index); cc_inv = NPU2_REG_OFFSET(stack, NPU2_BLOCK_XSL, NPU2_XSL_PSL_LLCMD_A0); lock(&dev->npu->lock); reg = npu2_scom_read(dev->npu->chip_id, dev->npu->xscom_base, cc_inv, NPU2_MISC_DA_LEN_8B); if (reg & PPC_BIT(16)) { rc = OPAL_BUSY; goto out; } reg = PE_handle | PPC_BIT(15); if (block == NPU2_BLOCK_OTL1) reg |= PPC_BIT(48); npu2_scom_write(dev->npu->chip_id, dev->npu->xscom_base, cc_inv, NPU2_MISC_DA_LEN_8B, reg); rc = OPAL_HARDWARE; while (retries--) { reg = npu2_scom_read(dev->npu->chip_id, dev->npu->xscom_base, cc_inv, NPU2_MISC_DA_LEN_8B); if (!(reg & PPC_BIT(16))) { rc = OPAL_SUCCESS; break; } /* the bit expected to flip in less than 200us */ time_wait_us(200); } out: unlock(&dev->npu->lock); return rc; } opal_call(OPAL_NPU_SPA_CLEAR_CACHE, opal_npu_spa_clear_cache, 3); static int get_template_rate(unsigned int templ, char *rate_buf) { int shift, idx, val; /* * Each rate is encoded over 4 bits (0->15), with 15 being the * slowest. The buffer is a succession of rates for all the * templates. The first 4 bits are for template 63, followed * by 4 bits for template 62, ... etc. So the rate for * template 0 is at the very end of the buffer. */ idx = (TL_MAX_TEMPLATE - templ) / 2; shift = 4 * (1 - ((TL_MAX_TEMPLATE - templ) % 2)); val = rate_buf[idx] >> shift; return val; } static bool is_template_supported(unsigned int templ, long capabilities) { return !!(capabilities & (1ull << templ)); } static int64_t opal_npu_tl_set(uint64_t phb_id, uint32_t __unused bdfn, long capabilities, uint64_t rate_phys, int rate_sz) { struct phb *phb = pci_get_phb(phb_id); struct npu2_dev *dev; uint64_t stack, block, reg, templ_rate; int i, rate_pos; char *rate = (char *) rate_phys; if (!phb || phb->phb_type != phb_type_npu_v2_opencapi) return OPAL_PARAMETER; if (!opal_addr_valid(rate) || rate_sz != TL_RATE_BUF_SIZE) return OPAL_PARAMETER; dev = phb_to_npu2_dev_ocapi(phb); if (!dev) return OPAL_PARAMETER; block = index_to_block(dev->brick_index); stack = index_to_stack(dev->brick_index); /* * The 'capabilities' argument defines what TL template the * device can receive. OpenCAPI 3.0 and 4.0 define 64 templates, so * that's one bit per template. * * For each template, the device processing time may vary, so * the device advertises at what rate a message of a given * template can be sent. That's encoded in the 'rate' buffer. * * On P9, NPU only knows about TL templates 0 -> 3. * Per the spec, template 0 must be supported. */ if (!is_template_supported(0, capabilities)) return OPAL_PARAMETER; reg = npu2_scom_read(dev->npu->chip_id, dev->npu->xscom_base, NPU2_OTL_CONFIG1(stack, block), NPU2_MISC_DA_LEN_8B); reg &= ~(NPU2_OTL_CONFIG1_TX_TEMP1_EN | NPU2_OTL_CONFIG1_TX_TEMP2_EN | NPU2_OTL_CONFIG1_TX_TEMP3_EN); for (i = 0; i < 4; i++) { /* Skip template 0 as it is implicitly enabled */ if (i && is_template_supported(i, capabilities)) reg |= PPC_BIT(i); /* The tx rate should still be set for template 0 */ templ_rate = get_template_rate(i, rate); rate_pos = 8 + i * 4; reg = SETFIELD(PPC_BITMASK(rate_pos, rate_pos + 3), reg, templ_rate); } npu2_scom_write(dev->npu->chip_id, dev->npu->xscom_base, NPU2_OTL_CONFIG1(stack, block), NPU2_MISC_DA_LEN_8B, reg); OCAPIDBG(dev, "OTL configuration 1 register set to %llx\n", reg); return OPAL_SUCCESS; } opal_call(OPAL_NPU_TL_SET, opal_npu_tl_set, 5); static void set_mem_bar(struct npu2_dev *dev, uint64_t base, uint64_t size) { uint64_t stack, val, reg, bar_offset, pa_config_offset; uint8_t memsel; stack = index_to_stack(dev->brick_index); switch (dev->brick_index) { case 2: case 4: bar_offset = NPU2_GPU0_MEM_BAR; pa_config_offset = NPU2_CQ_CTL_MISC_PA0_CONFIG; break; case 3: case 5: bar_offset = NPU2_GPU1_MEM_BAR; pa_config_offset = NPU2_CQ_CTL_MISC_PA1_CONFIG; break; default: assert(false); } assert((!size && !base) || (size && base)); /* * Memory select configuration: * - 0b000 - BAR disabled * - 0b001 - match 0b00, 0b01 * - 0b010 - match 0b01, 0b10 * - 0b011 - match 0b00, 0b10 * - 0b100 - match 0b00 * - 0b101 - match 0b01 * - 0b110 - match 0b10 * - 0b111 - match 0b00, 0b01, 0b10 */ memsel = GETFIELD(PPC_BITMASK(13, 14), base); if (size) val = SETFIELD(NPU2_MEM_BAR_EN | NPU2_MEM_BAR_SEL_MEM, 0ULL, 0b100 + memsel); else val = 0; /* Base address - 12 bits, 1G aligned */ val = SETFIELD(NPU2_MEM_BAR_NODE_ADDR, val, GETFIELD(PPC_BITMASK(22, 33), base)); /* GCID */ val = SETFIELD(NPU2_MEM_BAR_GROUP, val, GETFIELD(PPC_BITMASK(15, 18), base)); val = SETFIELD(NPU2_MEM_BAR_CHIP, val, GETFIELD(PPC_BITMASK(19, 21), base)); /* Other settings */ val = SETFIELD(NPU2_MEM_BAR_POISON, val, 1); val = SETFIELD(NPU2_MEM_BAR_GRANULE, val, 0); val = SETFIELD(NPU2_MEM_BAR_BAR_SIZE, val, ilog2(size >> 30)); val = SETFIELD(NPU2_MEM_BAR_MODE, val, 0); for (int block = NPU2_BLOCK_SM_0; block <= NPU2_BLOCK_SM_3; block++) { reg = NPU2_REG_OFFSET(stack, block, bar_offset); npu2_write(dev->npu, reg, val); } /* Set PA config */ if (size) val = SETFIELD(NPU2_CQ_CTL_MISC_PA_CONFIG_MEMSELMATCH, 0ULL, 0b100 + memsel); else val = 0; val = SETFIELD(NPU2_CQ_CTL_MISC_PA_CONFIG_GRANULE, val, 0); val = SETFIELD(NPU2_CQ_CTL_MISC_PA_CONFIG_SIZE, val, ilog2(size >> 30)); val = SETFIELD(NPU2_CQ_CTL_MISC_PA_CONFIG_MODE, val, 0); val = SETFIELD(NPU2_CQ_CTL_MISC_PA_CONFIG_MASK, val, 0); reg = NPU2_REG_OFFSET(stack, NPU2_BLOCK_CTL, pa_config_offset); npu2_write(dev->npu, reg, val); } static int64_t alloc_mem_bar(struct npu2_dev *dev, uint64_t size, uint64_t *bar) { uint64_t phys_map_base, phys_map_size; int rc = OPAL_SUCCESS; lock(&dev->npu->lock); /* * Right now, we support 1 allocation per chip, of up to 4TB. * * In future, we will use chip address extension to support * >4TB ranges, and we will implement a more sophisticated * allocator to allow an allocation for every link on a chip. */ if (dev->npu->lpc_mem_allocated) { rc = OPAL_RESOURCE; goto out; } phys_map_get(dev->npu->chip_id, OCAPI_MEM, 0, &phys_map_base, &phys_map_size); if (size > phys_map_size) { /** * @fwts-label OCAPIInvalidLPCMemoryBARSize * @fwts-advice The operating system requested an unsupported * amount of OpenCAPI LPC memory. This is possibly a kernel * bug, or you may need to upgrade your firmware. */ OCAPIERR(dev, "Invalid LPC memory BAR allocation size requested: 0x%llx bytes (limit 0x%llx)\n", size, phys_map_size); rc = OPAL_PARAMETER; goto out; } /* Minimum BAR size is 1 GB */ if (size < (1 << 30)) { size = 1 << 30; } if (!is_pow2(size)) { size = 1ull << (ilog2(size) + 1); } set_mem_bar(dev, phys_map_base, size); *bar = phys_map_base; dev->npu->lpc_mem_allocated = dev; out: unlock(&dev->npu->lock); return rc; } static int64_t release_mem_bar(struct npu2_dev *dev) { int rc = OPAL_SUCCESS; lock(&dev->npu->lock); if (dev->npu->lpc_mem_allocated != dev) { rc = OPAL_PARAMETER; goto out; } set_mem_bar(dev, 0, 0); dev->npu->lpc_mem_allocated = NULL; out: unlock(&dev->npu->lock); return rc; } static int64_t opal_npu_mem_alloc(uint64_t phb_id, uint32_t __unused bdfn, uint64_t size, __be64 *__bar) { struct phb *phb = pci_get_phb(phb_id); struct npu2_dev *dev; uint64_t bar; int64_t rc; if (!phb || phb->phb_type != phb_type_npu_v2_opencapi) return OPAL_PARAMETER; dev = phb_to_npu2_dev_ocapi(phb); if (!dev) return OPAL_PARAMETER; if (!opal_addr_valid(__bar)) return OPAL_PARAMETER; rc = alloc_mem_bar(dev, size, &bar); if (rc == OPAL_SUCCESS) *__bar = cpu_to_be64(bar); return rc; } opal_call(OPAL_NPU_MEM_ALLOC, opal_npu_mem_alloc, 4); static int64_t opal_npu_mem_release(uint64_t phb_id, uint32_t __unused bdfn) { struct phb *phb = pci_get_phb(phb_id); struct npu2_dev *dev; if (!phb || phb->phb_type != phb_type_npu_v2_opencapi) return OPAL_PARAMETER; dev = phb_to_npu2_dev_ocapi(phb); if (!dev) return OPAL_PARAMETER; return release_mem_bar(dev); } opal_call(OPAL_NPU_MEM_RELEASE, opal_npu_mem_release, 2);