// SPDX-License-Identifier: GPL-2.0+ // Copyright 2017 IBM Corp. #include #include #include #include "ocxl_internal.h" #define EXTRACT_BIT(val, bit) (!!(val & BIT(bit))) #define EXTRACT_BITS(val, s, e) ((val & GENMASK(e, s)) >> s) #define OCXL_DVSEC_AFU_IDX_MASK GENMASK(5, 0) #define OCXL_DVSEC_ACTAG_MASK GENMASK(11, 0) #define OCXL_DVSEC_PASID_MASK GENMASK(19, 0) #define OCXL_DVSEC_PASID_LOG_MASK GENMASK(4, 0) #define OCXL_DVSEC_TEMPL_VERSION 0x0 #define OCXL_DVSEC_TEMPL_NAME 0x4 #define OCXL_DVSEC_TEMPL_AFU_VERSION 0x1C #define OCXL_DVSEC_TEMPL_MMIO_GLOBAL 0x20 #define OCXL_DVSEC_TEMPL_MMIO_GLOBAL_SZ 0x28 #define OCXL_DVSEC_TEMPL_MMIO_PP 0x30 #define OCXL_DVSEC_TEMPL_MMIO_PP_SZ 0x38 #define OCXL_DVSEC_TEMPL_ALL_MEM_SZ 0x3C #define OCXL_DVSEC_TEMPL_LPC_MEM_START 0x40 #define OCXL_DVSEC_TEMPL_WWID 0x48 #define OCXL_DVSEC_TEMPL_LPC_MEM_SZ 0x58 #define OCXL_MAX_AFU_PER_FUNCTION 64 #define OCXL_TEMPL_LEN_1_0 0x58 #define OCXL_TEMPL_LEN_1_1 0x60 #define OCXL_TEMPL_NAME_LEN 24 #define OCXL_CFG_TIMEOUT 3 static int find_dvsec(struct pci_dev *dev, int dvsec_id) { return pci_find_dvsec_capability(dev, PCI_VENDOR_ID_IBM, dvsec_id); } static int find_dvsec_afu_ctrl(struct pci_dev *dev, u8 afu_idx) { int vsec = 0; u16 vendor, id; u8 idx; while ((vsec = pci_find_next_ext_capability(dev, vsec, OCXL_EXT_CAP_ID_DVSEC))) { pci_read_config_word(dev, vsec + OCXL_DVSEC_VENDOR_OFFSET, &vendor); pci_read_config_word(dev, vsec + OCXL_DVSEC_ID_OFFSET, &id); if (vendor == PCI_VENDOR_ID_IBM && id == OCXL_DVSEC_AFU_CTRL_ID) { pci_read_config_byte(dev, vsec + OCXL_DVSEC_AFU_CTRL_AFU_IDX, &idx); if (idx == afu_idx) return vsec; } } return 0; } /** * get_function_0() - Find a related PCI device (function 0) * @dev: PCI device to match * * Returns a pointer to the related device, or null if not found */ static struct pci_dev *get_function_0(struct pci_dev *dev) { unsigned int devfn = PCI_DEVFN(PCI_SLOT(dev->devfn), 0); return pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus), dev->bus->number, devfn); } static void read_pasid(struct pci_dev *dev, struct ocxl_fn_config *fn) { u16 val; int pos; pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PASID); if (!pos) { /* * PASID capability is not mandatory, but there * shouldn't be any AFU */ dev_dbg(&dev->dev, "Function doesn't require any PASID\n"); fn->max_pasid_log = -1; goto out; } pci_read_config_word(dev, pos + PCI_PASID_CAP, &val); fn->max_pasid_log = EXTRACT_BITS(val, 8, 12); out: dev_dbg(&dev->dev, "PASID capability:\n"); dev_dbg(&dev->dev, " Max PASID log = %d\n", fn->max_pasid_log); } static int read_dvsec_tl(struct pci_dev *dev, struct ocxl_fn_config *fn) { int pos; pos = find_dvsec(dev, OCXL_DVSEC_TL_ID); if (!pos && PCI_FUNC(dev->devfn) == 0) { dev_err(&dev->dev, "Can't find TL DVSEC\n"); return -ENODEV; } if (pos && PCI_FUNC(dev->devfn) != 0) { dev_err(&dev->dev, "TL DVSEC is only allowed on function 0\n"); return -ENODEV; } fn->dvsec_tl_pos = pos; return 0; } static int read_dvsec_function(struct pci_dev *dev, struct ocxl_fn_config *fn) { int pos, afu_present; u32 val; pos = find_dvsec(dev, OCXL_DVSEC_FUNC_ID); if (!pos) { dev_err(&dev->dev, "Can't find function DVSEC\n"); return -ENODEV; } fn->dvsec_function_pos = pos; pci_read_config_dword(dev, pos + OCXL_DVSEC_FUNC_OFF_INDEX, &val); afu_present = EXTRACT_BIT(val, 31); if (!afu_present) { fn->max_afu_index = -1; dev_dbg(&dev->dev, "Function doesn't define any AFU\n"); goto out; } fn->max_afu_index = EXTRACT_BITS(val, 24, 29); out: dev_dbg(&dev->dev, "Function DVSEC:\n"); dev_dbg(&dev->dev, " Max AFU index = %d\n", fn->max_afu_index); return 0; } static int read_dvsec_afu_info(struct pci_dev *dev, struct ocxl_fn_config *fn) { int pos; if (fn->max_afu_index < 0) { fn->dvsec_afu_info_pos = -1; return 0; } pos = find_dvsec(dev, OCXL_DVSEC_AFU_INFO_ID); if (!pos) { dev_err(&dev->dev, "Can't find AFU information DVSEC\n"); return -ENODEV; } fn->dvsec_afu_info_pos = pos; return 0; } static int read_dvsec_vendor(struct pci_dev *dev) { int pos; u32 cfg, tlx, dlx, reset_reload; /* * vendor specific DVSEC, for IBM images only. Some older * images may not have it * * It's only used on function 0 to specify the version of some * logic blocks and to give access to special registers to * enable host-based flashing. */ if (PCI_FUNC(dev->devfn) != 0) return 0; pos = find_dvsec(dev, OCXL_DVSEC_VENDOR_ID); if (!pos) return 0; pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_CFG_VERS, &cfg); pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_TLX_VERS, &tlx); pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_DLX_VERS, &dlx); pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_RESET_RELOAD, &reset_reload); dev_dbg(&dev->dev, "Vendor specific DVSEC:\n"); dev_dbg(&dev->dev, " CFG version = 0x%x\n", cfg); dev_dbg(&dev->dev, " TLX version = 0x%x\n", tlx); dev_dbg(&dev->dev, " DLX version = 0x%x\n", dlx); dev_dbg(&dev->dev, " ResetReload = 0x%x\n", reset_reload); return 0; } /** * get_dvsec_vendor0() - Find a related PCI device (function 0) * @dev: PCI device to match * @dev0: The PCI device (function 0) found * @out_pos: The position of PCI device (function 0) * * Returns 0 on success, negative on failure. * * NOTE: If it's successful, the reference of dev0 is increased, * so after using it, the callers must call pci_dev_put() to give * up the reference. */ static int get_dvsec_vendor0(struct pci_dev *dev, struct pci_dev **dev0, int *out_pos) { int pos; if (PCI_FUNC(dev->devfn) != 0) { dev = get_function_0(dev); if (!dev) return -1; } else { dev = pci_dev_get(dev); } pos = find_dvsec(dev, OCXL_DVSEC_VENDOR_ID); if (!pos) { pci_dev_put(dev); return -1; } *dev0 = dev; *out_pos = pos; return 0; } int ocxl_config_get_reset_reload(struct pci_dev *dev, int *val) { struct pci_dev *dev0; u32 reset_reload; int pos; if (get_dvsec_vendor0(dev, &dev0, &pos)) return -1; pci_read_config_dword(dev0, pos + OCXL_DVSEC_VENDOR_RESET_RELOAD, &reset_reload); pci_dev_put(dev0); *val = !!(reset_reload & BIT(0)); return 0; } int ocxl_config_set_reset_reload(struct pci_dev *dev, int val) { struct pci_dev *dev0; u32 reset_reload; int pos; if (get_dvsec_vendor0(dev, &dev0, &pos)) return -1; pci_read_config_dword(dev0, pos + OCXL_DVSEC_VENDOR_RESET_RELOAD, &reset_reload); if (val) reset_reload |= BIT(0); else reset_reload &= ~BIT(0); pci_write_config_dword(dev0, pos + OCXL_DVSEC_VENDOR_RESET_RELOAD, reset_reload); pci_dev_put(dev0); return 0; } static int validate_function(struct pci_dev *dev, struct ocxl_fn_config *fn) { if (fn->max_pasid_log == -1 && fn->max_afu_index >= 0) { dev_err(&dev->dev, "AFUs are defined but no PASIDs are requested\n"); return -EINVAL; } if (fn->max_afu_index > OCXL_MAX_AFU_PER_FUNCTION) { dev_err(&dev->dev, "Max AFU index out of architectural limit (%d vs %d)\n", fn->max_afu_index, OCXL_MAX_AFU_PER_FUNCTION); return -EINVAL; } return 0; } int ocxl_config_read_function(struct pci_dev *dev, struct ocxl_fn_config *fn) { int rc; read_pasid(dev, fn); rc = read_dvsec_tl(dev, fn); if (rc) { dev_err(&dev->dev, "Invalid Transaction Layer DVSEC configuration: %d\n", rc); return -ENODEV; } rc = read_dvsec_function(dev, fn); if (rc) { dev_err(&dev->dev, "Invalid Function DVSEC configuration: %d\n", rc); return -ENODEV; } rc = read_dvsec_afu_info(dev, fn); if (rc) { dev_err(&dev->dev, "Invalid AFU configuration: %d\n", rc); return -ENODEV; } rc = read_dvsec_vendor(dev); if (rc) { dev_err(&dev->dev, "Invalid vendor specific DVSEC configuration: %d\n", rc); return -ENODEV; } rc = validate_function(dev, fn); return rc; } EXPORT_SYMBOL_GPL(ocxl_config_read_function); static int read_afu_info(struct pci_dev *dev, struct ocxl_fn_config *fn, int offset, u32 *data) { u32 val; unsigned long timeout = jiffies + (HZ * OCXL_CFG_TIMEOUT); int pos = fn->dvsec_afu_info_pos; /* Protect 'data valid' bit */ if (EXTRACT_BIT(offset, 31)) { dev_err(&dev->dev, "Invalid offset in AFU info DVSEC\n"); return -EINVAL; } pci_write_config_dword(dev, pos + OCXL_DVSEC_AFU_INFO_OFF, offset); pci_read_config_dword(dev, pos + OCXL_DVSEC_AFU_INFO_OFF, &val); while (!EXTRACT_BIT(val, 31)) { if (time_after_eq(jiffies, timeout)) { dev_err(&dev->dev, "Timeout while reading AFU info DVSEC (offset=%d)\n", offset); return -EBUSY; } cpu_relax(); pci_read_config_dword(dev, pos + OCXL_DVSEC_AFU_INFO_OFF, &val); } pci_read_config_dword(dev, pos + OCXL_DVSEC_AFU_INFO_DATA, data); return 0; } /** * read_template_version() - Read the template version from the AFU * @dev: the device for the AFU * @fn: the AFU offsets * @len: outputs the template length * @version: outputs the major<<8,minor version * * Returns 0 on success, negative on failure */ static int read_template_version(struct pci_dev *dev, struct ocxl_fn_config *fn, u16 *len, u16 *version) { u32 val32; u8 major, minor; int rc; rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_VERSION, &val32); if (rc) return rc; *len = EXTRACT_BITS(val32, 16, 31); major = EXTRACT_BITS(val32, 8, 15); minor = EXTRACT_BITS(val32, 0, 7); *version = (major << 8) + minor; return 0; } int ocxl_config_check_afu_index(struct pci_dev *dev, struct ocxl_fn_config *fn, int afu_idx) { int rc; u16 templ_version; u16 len, expected_len; pci_write_config_byte(dev, fn->dvsec_afu_info_pos + OCXL_DVSEC_AFU_INFO_AFU_IDX, afu_idx); rc = read_template_version(dev, fn, &len, &templ_version); if (rc) return rc; /* AFU index map can have holes, in which case we read all 0's */ if (!templ_version && !len) return 0; dev_dbg(&dev->dev, "AFU descriptor template version %d.%d\n", templ_version >> 8, templ_version & 0xFF); switch (templ_version) { case 0x0005: // v0.5 was used prior to the spec approval case 0x0100: expected_len = OCXL_TEMPL_LEN_1_0; break; case 0x0101: expected_len = OCXL_TEMPL_LEN_1_1; break; default: dev_warn(&dev->dev, "Unknown AFU template version %#x\n", templ_version); expected_len = len; } if (len != expected_len) dev_warn(&dev->dev, "Unexpected template length %#x in AFU information, expected %#x for version %#x\n", len, expected_len, templ_version); return 1; } static int read_afu_name(struct pci_dev *dev, struct ocxl_fn_config *fn, struct ocxl_afu_config *afu) { int i, rc; u32 val, *ptr; BUILD_BUG_ON(OCXL_AFU_NAME_SZ < OCXL_TEMPL_NAME_LEN); for (i = 0; i < OCXL_TEMPL_NAME_LEN; i += 4) { rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_NAME + i, &val); if (rc) return rc; ptr = (u32 *) &afu->name[i]; *ptr = le32_to_cpu((__force __le32) val); } afu->name[OCXL_AFU_NAME_SZ - 1] = '\0'; /* play safe */ return 0; } static int read_afu_mmio(struct pci_dev *dev, struct ocxl_fn_config *fn, struct ocxl_afu_config *afu) { int rc; u32 val; /* * Global MMIO */ rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_GLOBAL, &val); if (rc) return rc; afu->global_mmio_bar = EXTRACT_BITS(val, 0, 2); afu->global_mmio_offset = EXTRACT_BITS(val, 16, 31) << 16; rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_GLOBAL + 4, &val); if (rc) return rc; afu->global_mmio_offset += (u64) val << 32; rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_GLOBAL_SZ, &val); if (rc) return rc; afu->global_mmio_size = val; /* * Per-process MMIO */ rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_PP, &val); if (rc) return rc; afu->pp_mmio_bar = EXTRACT_BITS(val, 0, 2); afu->pp_mmio_offset = EXTRACT_BITS(val, 16, 31) << 16; rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_PP + 4, &val); if (rc) return rc; afu->pp_mmio_offset += (u64) val << 32; rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_PP_SZ, &val); if (rc) return rc; afu->pp_mmio_stride = val; return 0; } static int read_afu_control(struct pci_dev *dev, struct ocxl_afu_config *afu) { int pos; u8 val8; u16 val16; pos = find_dvsec_afu_ctrl(dev, afu->idx); if (!pos) { dev_err(&dev->dev, "Can't find AFU control DVSEC for AFU %d\n", afu->idx); return -ENODEV; } afu->dvsec_afu_control_pos = pos; pci_read_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_PASID_SUP, &val8); afu->pasid_supported_log = EXTRACT_BITS(val8, 0, 4); pci_read_config_word(dev, pos + OCXL_DVSEC_AFU_CTRL_ACTAG_SUP, &val16); afu->actag_supported = EXTRACT_BITS(val16, 0, 11); return 0; } static bool char_allowed(int c) { /* * Permitted Characters : Alphanumeric, hyphen, underscore, comma */ if ((c >= 0x30 && c <= 0x39) /* digits */ || (c >= 0x41 && c <= 0x5A) /* upper case */ || (c >= 0x61 && c <= 0x7A) /* lower case */ || c == 0 /* NULL */ || c == 0x2D /* - */ || c == 0x5F /* _ */ || c == 0x2C /* , */) return true; return false; } static int validate_afu(struct pci_dev *dev, struct ocxl_afu_config *afu) { int i; if (!afu->name[0]) { dev_err(&dev->dev, "Empty AFU name\n"); return -EINVAL; } for (i = 0; i < OCXL_TEMPL_NAME_LEN; i++) { if (!char_allowed(afu->name[i])) { dev_err(&dev->dev, "Invalid character in AFU name\n"); return -EINVAL; } } if (afu->global_mmio_bar != 0 && afu->global_mmio_bar != 2 && afu->global_mmio_bar != 4) { dev_err(&dev->dev, "Invalid global MMIO bar number\n"); return -EINVAL; } if (afu->pp_mmio_bar != 0 && afu->pp_mmio_bar != 2 && afu->pp_mmio_bar != 4) { dev_err(&dev->dev, "Invalid per-process MMIO bar number\n"); return -EINVAL; } return 0; } /** * read_afu_lpc_memory_info() - Populate AFU metadata regarding LPC memory * @dev: the device for the AFU * @fn: the AFU offsets * @afu: the AFU struct to populate the LPC metadata into * * Returns 0 on success, negative on failure */ static int read_afu_lpc_memory_info(struct pci_dev *dev, struct ocxl_fn_config *fn, struct ocxl_afu_config *afu) { int rc; u32 val32; u16 templ_version; u16 templ_len; u64 total_mem_size = 0; u64 lpc_mem_size = 0; afu->lpc_mem_offset = 0; afu->lpc_mem_size = 0; afu->special_purpose_mem_offset = 0; afu->special_purpose_mem_size = 0; /* * For AFUs following template v1.0, the LPC memory covers the * total memory. Its size is a power of 2. * * For AFUs with template >= v1.01, the total memory size is * still a power of 2, but it is split in 2 parts: * - the LPC memory, whose size can now be anything * - the remainder memory is a special purpose memory, whose * definition is AFU-dependent. It is not accessible through * the usual commands for LPC memory */ rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_ALL_MEM_SZ, &val32); if (rc) return rc; val32 = EXTRACT_BITS(val32, 0, 7); if (!val32) return 0; /* No LPC memory */ /* * The configuration space spec allows for a memory size of up * to 2^255 bytes. * * Current generation hardware uses 56-bit physical addresses, * but we won't be able to get near close to that, as we won't * have a hole big enough in the memory map. Let it pass in * the driver for now. We'll get an error from the firmware * when trying to configure something too big. */ total_mem_size = 1ull << val32; rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_LPC_MEM_START, &val32); if (rc) return rc; afu->lpc_mem_offset = val32; rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_LPC_MEM_START + 4, &val32); if (rc) return rc; afu->lpc_mem_offset |= (u64) val32 << 32; rc = read_template_version(dev, fn, &templ_len, &templ_version); if (rc) return rc; if (templ_version >= 0x0101) { rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_LPC_MEM_SZ, &val32); if (rc) return rc; lpc_mem_size = val32; rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_LPC_MEM_SZ + 4, &val32); if (rc) return rc; lpc_mem_size |= (u64) val32 << 32; } else { lpc_mem_size = total_mem_size; } afu->lpc_mem_size = lpc_mem_size; if (lpc_mem_size < total_mem_size) { afu->special_purpose_mem_offset = afu->lpc_mem_offset + lpc_mem_size; afu->special_purpose_mem_size = total_mem_size - lpc_mem_size; } return 0; } int ocxl_config_read_afu(struct pci_dev *dev, struct ocxl_fn_config *fn, struct ocxl_afu_config *afu, u8 afu_idx) { int rc; u32 val32; /* * First, we need to write the AFU idx for the AFU we want to * access. */ WARN_ON((afu_idx & OCXL_DVSEC_AFU_IDX_MASK) != afu_idx); afu->idx = afu_idx; pci_write_config_byte(dev, fn->dvsec_afu_info_pos + OCXL_DVSEC_AFU_INFO_AFU_IDX, afu->idx); rc = read_afu_name(dev, fn, afu); if (rc) return rc; rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_AFU_VERSION, &val32); if (rc) return rc; afu->version_major = EXTRACT_BITS(val32, 24, 31); afu->version_minor = EXTRACT_BITS(val32, 16, 23); afu->afuc_type = EXTRACT_BITS(val32, 14, 15); afu->afum_type = EXTRACT_BITS(val32, 12, 13); afu->profile = EXTRACT_BITS(val32, 0, 7); rc = read_afu_mmio(dev, fn, afu); if (rc) return rc; rc = read_afu_lpc_memory_info(dev, fn, afu); if (rc) return rc; rc = read_afu_control(dev, afu); if (rc) return rc; dev_dbg(&dev->dev, "AFU configuration:\n"); dev_dbg(&dev->dev, " name = %s\n", afu->name); dev_dbg(&dev->dev, " version = %d.%d\n", afu->version_major, afu->version_minor); dev_dbg(&dev->dev, " global mmio bar = %hhu\n", afu->global_mmio_bar); dev_dbg(&dev->dev, " global mmio offset = %#llx\n", afu->global_mmio_offset); dev_dbg(&dev->dev, " global mmio size = %#x\n", afu->global_mmio_size); dev_dbg(&dev->dev, " pp mmio bar = %hhu\n", afu->pp_mmio_bar); dev_dbg(&dev->dev, " pp mmio offset = %#llx\n", afu->pp_mmio_offset); dev_dbg(&dev->dev, " pp mmio stride = %#x\n", afu->pp_mmio_stride); dev_dbg(&dev->dev, " lpc_mem offset = %#llx\n", afu->lpc_mem_offset); dev_dbg(&dev->dev, " lpc_mem size = %#llx\n", afu->lpc_mem_size); dev_dbg(&dev->dev, " special purpose mem offset = %#llx\n", afu->special_purpose_mem_offset); dev_dbg(&dev->dev, " special purpose mem size = %#llx\n", afu->special_purpose_mem_size); dev_dbg(&dev->dev, " pasid supported (log) = %u\n", afu->pasid_supported_log); dev_dbg(&dev->dev, " actag supported = %u\n", afu->actag_supported); rc = validate_afu(dev, afu); return rc; } EXPORT_SYMBOL_GPL(ocxl_config_read_afu); int ocxl_config_get_actag_info(struct pci_dev *dev, u16 *base, u16 *enabled, u16 *supported) { int rc; /* * This is really a simple wrapper for the kernel API, to * avoid an external driver using ocxl as a library to call * platform-dependent code */ rc = pnv_ocxl_get_actag(dev, base, enabled, supported); if (rc) { dev_err(&dev->dev, "Can't get actag for device: %d\n", rc); return rc; } return 0; } EXPORT_SYMBOL_GPL(ocxl_config_get_actag_info); void ocxl_config_set_afu_actag(struct pci_dev *dev, int pos, int actag_base, int actag_count) { u16 val; val = actag_count & OCXL_DVSEC_ACTAG_MASK; pci_write_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_ACTAG_EN, val); val = actag_base & OCXL_DVSEC_ACTAG_MASK; pci_write_config_dword(dev, pos + OCXL_DVSEC_AFU_CTRL_ACTAG_BASE, val); } EXPORT_SYMBOL_GPL(ocxl_config_set_afu_actag); int ocxl_config_get_pasid_info(struct pci_dev *dev, int *count) { return pnv_ocxl_get_pasid_count(dev, count); } void ocxl_config_set_afu_pasid(struct pci_dev *dev, int pos, int pasid_base, u32 pasid_count_log) { u8 val8; u32 val32; val8 = pasid_count_log & OCXL_DVSEC_PASID_LOG_MASK; pci_write_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_PASID_EN, val8); pci_read_config_dword(dev, pos + OCXL_DVSEC_AFU_CTRL_PASID_BASE, &val32); val32 &= ~OCXL_DVSEC_PASID_MASK; val32 |= pasid_base & OCXL_DVSEC_PASID_MASK; pci_write_config_dword(dev, pos + OCXL_DVSEC_AFU_CTRL_PASID_BASE, val32); } EXPORT_SYMBOL_GPL(ocxl_config_set_afu_pasid); void ocxl_config_set_afu_state(struct pci_dev *dev, int pos, int enable) { u8 val; pci_read_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_ENABLE, &val); if (enable) val |= 1; else val &= 0xFE; pci_write_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_ENABLE, val); } EXPORT_SYMBOL_GPL(ocxl_config_set_afu_state); int ocxl_config_set_TL(struct pci_dev *dev, int tl_dvsec) { u32 val; __be32 *be32ptr; u8 timers; int i, rc; long recv_cap; char *recv_rate; /* * Skip on function != 0, as the TL can only be defined on 0 */ if (PCI_FUNC(dev->devfn) != 0) return 0; recv_rate = kzalloc(PNV_OCXL_TL_RATE_BUF_SIZE, GFP_KERNEL); if (!recv_rate) return -ENOMEM; /* * The spec defines 64 templates for messages in the * Transaction Layer (TL). * * The host and device each support a subset, so we need to * configure the transmitters on each side to send only * templates the receiver understands, at a rate the receiver * can process. Per the spec, template 0 must be supported by * everybody. That's the template which has been used by the * host and device so far. * * The sending rate limit must be set before the template is * enabled. */ /* * Device -> host */ rc = pnv_ocxl_get_tl_cap(dev, &recv_cap, recv_rate, PNV_OCXL_TL_RATE_BUF_SIZE); if (rc) goto out; for (i = 0; i < PNV_OCXL_TL_RATE_BUF_SIZE; i += 4) { be32ptr = (__be32 *) &recv_rate[i]; pci_write_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_SEND_RATE + i, be32_to_cpu(*be32ptr)); } val = recv_cap >> 32; pci_write_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_SEND_CAP, val); val = recv_cap & GENMASK(31, 0); pci_write_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_SEND_CAP + 4, val); /* * Host -> device */ for (i = 0; i < PNV_OCXL_TL_RATE_BUF_SIZE; i += 4) { pci_read_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_RECV_RATE + i, &val); be32ptr = (__be32 *) &recv_rate[i]; *be32ptr = cpu_to_be32(val); } pci_read_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_RECV_CAP, &val); recv_cap = (long) val << 32; pci_read_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_RECV_CAP + 4, &val); recv_cap |= val; rc = pnv_ocxl_set_tl_conf(dev, recv_cap, __pa(recv_rate), PNV_OCXL_TL_RATE_BUF_SIZE); if (rc) goto out; /* * Opencapi commands needing to be retried are classified per * the TL in 2 groups: short and long commands. * * The short back off timer it not used for now. It will be * for opencapi 4.0. * * The long back off timer is typically used when an AFU hits * a page fault but the NPU is already processing one. So the * AFU needs to wait before it can resubmit. Having a value * too low doesn't break anything, but can generate extra * traffic on the link. * We set it to 1.6 us for now. It's shorter than, but in the * same order of magnitude as the time spent to process a page * fault. */ timers = 0x2 << 4; /* long timer = 1.6 us */ pci_write_config_byte(dev, tl_dvsec + OCXL_DVSEC_TL_BACKOFF_TIMERS, timers); rc = 0; out: kfree(recv_rate); return rc; } EXPORT_SYMBOL_GPL(ocxl_config_set_TL); int ocxl_config_terminate_pasid(struct pci_dev *dev, int afu_control, int pasid) { u32 val; unsigned long timeout; pci_read_config_dword(dev, afu_control + OCXL_DVSEC_AFU_CTRL_TERM_PASID, &val); if (EXTRACT_BIT(val, 20)) { dev_err(&dev->dev, "Can't terminate PASID %#x, previous termination didn't complete\n", pasid); return -EBUSY; } val &= ~OCXL_DVSEC_PASID_MASK; val |= pasid & OCXL_DVSEC_PASID_MASK; val |= BIT(20); pci_write_config_dword(dev, afu_control + OCXL_DVSEC_AFU_CTRL_TERM_PASID, val); timeout = jiffies + (HZ * OCXL_CFG_TIMEOUT); pci_read_config_dword(dev, afu_control + OCXL_DVSEC_AFU_CTRL_TERM_PASID, &val); while (EXTRACT_BIT(val, 20)) { if (time_after_eq(jiffies, timeout)) { dev_err(&dev->dev, "Timeout while waiting for AFU to terminate PASID %#x\n", pasid); return -EBUSY; } cpu_relax(); pci_read_config_dword(dev, afu_control + OCXL_DVSEC_AFU_CTRL_TERM_PASID, &val); } return 0; } EXPORT_SYMBOL_GPL(ocxl_config_terminate_pasid); void ocxl_config_set_actag(struct pci_dev *dev, int func_dvsec, u32 tag_first, u32 tag_count) { u32 val; val = (tag_first & OCXL_DVSEC_ACTAG_MASK) << 16; val |= tag_count & OCXL_DVSEC_ACTAG_MASK; pci_write_config_dword(dev, func_dvsec + OCXL_DVSEC_FUNC_OFF_ACTAG, val); } EXPORT_SYMBOL_GPL(ocxl_config_set_actag);