diff options
Diffstat (limited to 'hw/pci')
| -rw-r--r-- | hw/pci/meson.build | 1 | ||||
| -rw-r--r-- | hw/pci/pcie_doe.c | 367 |
2 files changed, 368 insertions, 0 deletions
diff --git a/hw/pci/meson.build b/hw/pci/meson.build index bcc9c75919..5aff7ed1c6 100644 --- a/hw/pci/meson.build +++ b/hw/pci/meson.build @@ -13,6 +13,7 @@ pci_ss.add(files( # allow plugging PCIe devices into PCI buses, include them even if # CONFIG_PCI_EXPRESS=n. pci_ss.add(files('pcie.c', 'pcie_aer.c')) +pci_ss.add(files('pcie_doe.c')) softmmu_ss.add(when: 'CONFIG_PCI_EXPRESS', if_true: files('pcie_port.c', 'pcie_host.c')) softmmu_ss.add_all(when: 'CONFIG_PCI', if_true: pci_ss) diff --git a/hw/pci/pcie_doe.c b/hw/pci/pcie_doe.c new file mode 100644 index 0000000000..2210f86968 --- /dev/null +++ b/hw/pci/pcie_doe.c @@ -0,0 +1,367 @@ +/* + * PCIe Data Object Exchange + * + * Copyright (C) 2021 Avery Design Systems, Inc. + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "qemu/log.h" +#include "qemu/error-report.h" +#include "qapi/error.h" +#include "qemu/range.h" +#include "hw/pci/pci.h" +#include "hw/pci/pcie.h" +#include "hw/pci/pcie_doe.h" +#include "hw/pci/msi.h" +#include "hw/pci/msix.h" + +#define DWORD_BYTE 4 + +typedef struct DoeDiscoveryReq { + DOEHeader header; + uint8_t index; + uint8_t reserved[3]; +} QEMU_PACKED DoeDiscoveryReq; + +typedef struct DoeDiscoveryRsp { + DOEHeader header; + uint16_t vendor_id; + uint8_t data_obj_type; + uint8_t next_index; +} QEMU_PACKED DoeDiscoveryRsp; + +static bool pcie_doe_discovery(DOECap *doe_cap) +{ + DoeDiscoveryReq *req = pcie_doe_get_write_mbox_ptr(doe_cap); + DoeDiscoveryRsp rsp; + uint8_t index = req->index; + DOEProtocol *prot; + + /* Discard request if length does not match DoeDiscoveryReq */ + if (pcie_doe_get_obj_len(req) < + DIV_ROUND_UP(sizeof(DoeDiscoveryReq), DWORD_BYTE)) { + return false; + } + + rsp.header = (DOEHeader) { + .vendor_id = PCI_VENDOR_ID_PCI_SIG, + .data_obj_type = PCI_SIG_DOE_DISCOVERY, + .length = DIV_ROUND_UP(sizeof(DoeDiscoveryRsp), DWORD_BYTE), + }; + + /* Point to the requested protocol, index 0 must be Discovery */ + if (index == 0) { + rsp.vendor_id = PCI_VENDOR_ID_PCI_SIG; + rsp.data_obj_type = PCI_SIG_DOE_DISCOVERY; + } else { + if (index < doe_cap->protocol_num) { + prot = &doe_cap->protocols[index - 1]; + rsp.vendor_id = prot->vendor_id; + rsp.data_obj_type = prot->data_obj_type; + } else { + rsp.vendor_id = 0xFFFF; + rsp.data_obj_type = 0xFF; + } + } + + if (index + 1 == doe_cap->protocol_num) { + rsp.next_index = 0; + } else { + rsp.next_index = index + 1; + } + + pcie_doe_set_rsp(doe_cap, &rsp); + + return true; +} + +static void pcie_doe_reset_mbox(DOECap *st) +{ + st->read_mbox_idx = 0; + st->read_mbox_len = 0; + st->write_mbox_len = 0; + + memset(st->read_mbox, 0, PCI_DOE_DW_SIZE_MAX * DWORD_BYTE); + memset(st->write_mbox, 0, PCI_DOE_DW_SIZE_MAX * DWORD_BYTE); +} + +void pcie_doe_init(PCIDevice *dev, DOECap *doe_cap, uint16_t offset, + DOEProtocol *protocols, bool intr, uint16_t vec) +{ + pcie_add_capability(dev, PCI_EXT_CAP_ID_DOE, 0x1, offset, + PCI_DOE_SIZEOF); + + doe_cap->pdev = dev; + doe_cap->offset = offset; + + if (intr && (msi_present(dev) || msix_present(dev))) { + doe_cap->cap.intr = intr; + doe_cap->cap.vec = vec; + } + + doe_cap->write_mbox = g_malloc0(PCI_DOE_DW_SIZE_MAX * DWORD_BYTE); + doe_cap->read_mbox = g_malloc0(PCI_DOE_DW_SIZE_MAX * DWORD_BYTE); + + pcie_doe_reset_mbox(doe_cap); + + doe_cap->protocols = protocols; + for (; protocols->vendor_id; protocols++) { + doe_cap->protocol_num++; + } + assert(doe_cap->protocol_num < PCI_DOE_PROTOCOL_NUM_MAX); + + /* Increment to allow for the discovery protocol */ + doe_cap->protocol_num++; +} + +void pcie_doe_fini(DOECap *doe_cap) +{ + g_free(doe_cap->read_mbox); + g_free(doe_cap->write_mbox); + g_free(doe_cap); +} + +uint32_t pcie_doe_build_protocol(DOEProtocol *p) +{ + return DATA_OBJ_BUILD_HEADER1(p->vendor_id, p->data_obj_type); +} + +void *pcie_doe_get_write_mbox_ptr(DOECap *doe_cap) +{ + return doe_cap->write_mbox; +} + +/* + * Copy the response to read mailbox buffer + * This might be called in self-defined handle_request() if a DOE response is + * required in the corresponding protocol + */ +void pcie_doe_set_rsp(DOECap *doe_cap, void *rsp) +{ + uint32_t len = pcie_doe_get_obj_len(rsp); + + memcpy(doe_cap->read_mbox + doe_cap->read_mbox_len, rsp, len * DWORD_BYTE); + doe_cap->read_mbox_len += len; +} + +uint32_t pcie_doe_get_obj_len(void *obj) +{ + uint32_t len; + + if (!obj) { + return 0; + } + + /* Only lower 18 bits are valid */ + len = DATA_OBJ_LEN_MASK(((DOEHeader *)obj)->length); + + /* PCIe r6.0 Table 6.29: a value of 00000h indicates 2^18 DW */ + return (len) ? len : PCI_DOE_DW_SIZE_MAX; +} + +static void pcie_doe_irq_assert(DOECap *doe_cap) +{ + PCIDevice *dev = doe_cap->pdev; + + if (doe_cap->cap.intr && doe_cap->ctrl.intr) { + if (doe_cap->status.intr) { + return; + } + doe_cap->status.intr = 1; + + if (msix_enabled(dev)) { + msix_notify(dev, doe_cap->cap.vec); + } else if (msi_enabled(dev)) { + msi_notify(dev, doe_cap->cap.vec); + } + } +} + +static void pcie_doe_set_ready(DOECap *doe_cap, bool rdy) +{ + doe_cap->status.ready = rdy; + + if (rdy) { + pcie_doe_irq_assert(doe_cap); + } +} + +static void pcie_doe_set_error(DOECap *doe_cap, bool err) +{ + doe_cap->status.error = err; + + if (err) { + pcie_doe_irq_assert(doe_cap); + } +} + +/* + * Check incoming request in write_mbox for protocol format + */ +static void pcie_doe_prepare_rsp(DOECap *doe_cap) +{ + bool success = false; + int p; + bool (*handle_request)(DOECap *) = NULL; + + if (doe_cap->status.error) { + return; + } + + if (doe_cap->write_mbox[0] == + DATA_OBJ_BUILD_HEADER1(PCI_VENDOR_ID_PCI_SIG, PCI_SIG_DOE_DISCOVERY)) { + handle_request = pcie_doe_discovery; + } else { + for (p = 0; p < doe_cap->protocol_num - 1; p++) { + if (doe_cap->write_mbox[0] == + pcie_doe_build_protocol(&doe_cap->protocols[p])) { + handle_request = doe_cap->protocols[p].handle_request; + break; + } + } + } + + /* + * PCIe r6 DOE 6.30.1: + * If the number of DW transferred does not match the + * indicated Length for a data object, then the + * data object must be silently discarded. + */ + if (handle_request && (doe_cap->write_mbox_len == + pcie_doe_get_obj_len(pcie_doe_get_write_mbox_ptr(doe_cap)))) { + success = handle_request(doe_cap); + } + + if (success) { + pcie_doe_set_ready(doe_cap, 1); + } else { + pcie_doe_reset_mbox(doe_cap); + } +} + +/* + * Read from DOE config space. + * Return false if the address not within DOE_CAP range. + */ +bool pcie_doe_read_config(DOECap *doe_cap, uint32_t addr, int size, + uint32_t *buf) +{ + uint32_t shift; + uint16_t doe_offset = doe_cap->offset; + + if (!range_covers_byte(doe_offset + PCI_EXP_DOE_CAP, + PCI_DOE_SIZEOF - 4, addr)) { + return false; + } + + addr -= doe_offset; + *buf = 0; + + if (range_covers_byte(PCI_EXP_DOE_CAP, DWORD_BYTE, addr)) { + *buf = FIELD_DP32(*buf, PCI_DOE_CAP_REG, INTR_SUPP, + doe_cap->cap.intr); + *buf = FIELD_DP32(*buf, PCI_DOE_CAP_REG, DOE_INTR_MSG_NUM, + doe_cap->cap.vec); + } else if (range_covers_byte(PCI_EXP_DOE_CTRL, DWORD_BYTE, addr)) { + /* Must return ABORT=0 and GO=0 */ + *buf = FIELD_DP32(*buf, PCI_DOE_CAP_CONTROL, DOE_INTR_EN, + doe_cap->ctrl.intr); + } else if (range_covers_byte(PCI_EXP_DOE_STATUS, DWORD_BYTE, addr)) { + *buf = FIELD_DP32(*buf, PCI_DOE_CAP_STATUS, DOE_BUSY, + doe_cap->status.busy); + *buf = FIELD_DP32(*buf, PCI_DOE_CAP_STATUS, DOE_INTR_STATUS, + doe_cap->status.intr); + *buf = FIELD_DP32(*buf, PCI_DOE_CAP_STATUS, DOE_ERROR, + doe_cap->status.error); + *buf = FIELD_DP32(*buf, PCI_DOE_CAP_STATUS, DATA_OBJ_RDY, + doe_cap->status.ready); + /* Mailbox should be DW accessed */ + } else if (addr == PCI_EXP_DOE_RD_DATA_MBOX && size == DWORD_BYTE) { + if (doe_cap->status.ready && !doe_cap->status.error) { + *buf = doe_cap->read_mbox[doe_cap->read_mbox_idx]; + } + } + + /* Process Alignment */ + shift = addr % DWORD_BYTE; + *buf = extract32(*buf, shift * 8, size * 8); + + return true; +} + +/* + * Write to DOE config space. + * Return if the address not within DOE_CAP range or receives an abort + */ +void pcie_doe_write_config(DOECap *doe_cap, + uint32_t addr, uint32_t val, int size) +{ + uint16_t doe_offset = doe_cap->offset; + uint32_t shift; + + if (!range_covers_byte(doe_offset + PCI_EXP_DOE_CAP, + PCI_DOE_SIZEOF - 4, addr)) { + return; + } + + /* Process Alignment */ + shift = addr % DWORD_BYTE; + addr -= (doe_offset + shift); + val = deposit32(val, shift * 8, size * 8, val); + + switch (addr) { + case PCI_EXP_DOE_CTRL: + if (FIELD_EX32(val, PCI_DOE_CAP_CONTROL, DOE_ABORT)) { + pcie_doe_set_ready(doe_cap, 0); + pcie_doe_set_error(doe_cap, 0); + pcie_doe_reset_mbox(doe_cap); + return; + } + + if (FIELD_EX32(val, PCI_DOE_CAP_CONTROL, DOE_GO)) { + pcie_doe_prepare_rsp(doe_cap); + } + + if (FIELD_EX32(val, PCI_DOE_CAP_CONTROL, DOE_INTR_EN)) { + doe_cap->ctrl.intr = 1; + /* Clear interrupt bit located within the first byte */ + } else if (shift == 0) { + doe_cap->ctrl.intr = 0; + } + break; + case PCI_EXP_DOE_STATUS: + if (FIELD_EX32(val, PCI_DOE_CAP_STATUS, DOE_INTR_STATUS)) { + doe_cap->status.intr = 0; + } + break; + case PCI_EXP_DOE_RD_DATA_MBOX: + /* Mailbox should be DW accessed */ + if (size != DWORD_BYTE) { + return; + } + doe_cap->read_mbox_idx++; + if (doe_cap->read_mbox_idx == doe_cap->read_mbox_len) { + pcie_doe_reset_mbox(doe_cap); + pcie_doe_set_ready(doe_cap, 0); + } else if (doe_cap->read_mbox_idx > doe_cap->read_mbox_len) { + /* Underflow */ + pcie_doe_set_error(doe_cap, 1); + } + break; + case PCI_EXP_DOE_WR_DATA_MBOX: + /* Mailbox should be DW accessed */ + if (size != DWORD_BYTE) { + return; + } + doe_cap->write_mbox[doe_cap->write_mbox_len] = val; + doe_cap->write_mbox_len++; + break; + case PCI_EXP_DOE_CAP: + /* fallthrough */ + default: + break; + } +} |