diff options
Diffstat (limited to 'drivers/cxl/core/pci.c')
| -rw-r--r-- | drivers/cxl/core/pci.c | 128 |
1 files changed, 84 insertions, 44 deletions
diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c index e9e6c81ce0..2773f05adb 100644 --- a/drivers/cxl/core/pci.c +++ b/drivers/cxl/core/pci.c @@ -518,14 +518,14 @@ EXPORT_SYMBOL_NS_GPL(cxl_hdm_decode_init, CXL); FIELD_PREP(CXL_DOE_TABLE_ACCESS_ENTRY_HANDLE, (entry_handle))) static int cxl_cdat_get_length(struct device *dev, - struct pci_doe_mb *cdat_doe, + struct pci_doe_mb *doe_mb, size_t *length) { __le32 request = CDAT_DOE_REQ(0); __le32 response[2]; int rc; - rc = pci_doe(cdat_doe, PCI_DVSEC_VENDOR_ID_CXL, + rc = pci_doe(doe_mb, PCI_DVSEC_VENDOR_ID_CXL, CXL_DOE_PROTOCOL_TABLE_ACCESS, &request, sizeof(request), &response, sizeof(response)); @@ -543,56 +543,58 @@ static int cxl_cdat_get_length(struct device *dev, } static int cxl_cdat_read_table(struct device *dev, - struct pci_doe_mb *cdat_doe, - void *cdat_table, size_t *cdat_length) + struct pci_doe_mb *doe_mb, + struct cdat_doe_rsp *rsp, size_t *length) { - size_t length = *cdat_length + sizeof(__le32); - __le32 *data = cdat_table; - int entry_handle = 0; + size_t received, remaining = *length; + unsigned int entry_handle = 0; + union cdat_data *data; __le32 saved_dw = 0; do { __le32 request = CDAT_DOE_REQ(entry_handle); - struct cdat_entry_header *entry; - size_t entry_dw; int rc; - rc = pci_doe(cdat_doe, PCI_DVSEC_VENDOR_ID_CXL, + rc = pci_doe(doe_mb, PCI_DVSEC_VENDOR_ID_CXL, CXL_DOE_PROTOCOL_TABLE_ACCESS, &request, sizeof(request), - data, length); + rsp, sizeof(*rsp) + remaining); if (rc < 0) { dev_err(dev, "DOE failed: %d", rc); return rc; } - /* 1 DW Table Access Response Header + CDAT entry */ - entry = (struct cdat_entry_header *)(data + 1); - if ((entry_handle == 0 && - rc != sizeof(__le32) + sizeof(struct cdat_header)) || - (entry_handle > 0 && - (rc < sizeof(__le32) + sizeof(*entry) || - rc != sizeof(__le32) + le16_to_cpu(entry->length)))) + if (rc < sizeof(*rsp)) return -EIO; + data = (union cdat_data *)rsp->data; + received = rc - sizeof(*rsp); + + if (entry_handle == 0) { + if (received != sizeof(data->header)) + return -EIO; + } else { + if (received < sizeof(data->entry) || + received != le16_to_cpu(data->entry.length)) + return -EIO; + } + /* Get the CXL table access header entry handle */ entry_handle = FIELD_GET(CXL_DOE_TABLE_ACCESS_ENTRY_HANDLE, - le32_to_cpu(data[0])); - entry_dw = rc / sizeof(__le32); - /* Skip Header */ - entry_dw -= 1; + le32_to_cpu(rsp->doe_header)); + /* * Table Access Response Header overwrote the last DW of * previous entry, so restore that DW */ - *data = saved_dw; - length -= entry_dw * sizeof(__le32); - data += entry_dw; - saved_dw = *data; + rsp->doe_header = saved_dw; + remaining -= received; + rsp = (void *)rsp + received; + saved_dw = rsp->doe_header; } while (entry_handle != CXL_DOE_TABLE_ACCESS_LAST_ENTRY); /* Length in CDAT header may exceed concatenation of CDAT entries */ - *cdat_length -= length - sizeof(__le32); + *length -= remaining; return 0; } @@ -617,11 +619,11 @@ void read_cdat_data(struct cxl_port *port) { struct device *uport = port->uport_dev; struct device *dev = &port->dev; - struct pci_doe_mb *cdat_doe; + struct pci_doe_mb *doe_mb; struct pci_dev *pdev = NULL; struct cxl_memdev *cxlmd; - size_t cdat_length; - void *cdat_table, *cdat_buf; + struct cdat_doe_rsp *buf; + size_t table_length, length; int rc; if (is_cxl_memdev(uport)) { @@ -638,39 +640,48 @@ void read_cdat_data(struct cxl_port *port) if (!pdev) return; - cdat_doe = pci_find_doe_mailbox(pdev, PCI_DVSEC_VENDOR_ID_CXL, - CXL_DOE_PROTOCOL_TABLE_ACCESS); - if (!cdat_doe) { + doe_mb = pci_find_doe_mailbox(pdev, PCI_DVSEC_VENDOR_ID_CXL, + CXL_DOE_PROTOCOL_TABLE_ACCESS); + if (!doe_mb) { dev_dbg(dev, "No CDAT mailbox\n"); return; } port->cdat_available = true; - if (cxl_cdat_get_length(dev, cdat_doe, &cdat_length)) { + if (cxl_cdat_get_length(dev, doe_mb, &length)) { dev_dbg(dev, "No CDAT length\n"); return; } - cdat_buf = devm_kzalloc(dev, cdat_length + sizeof(__le32), GFP_KERNEL); - if (!cdat_buf) - return; + /* + * The begin of the CDAT buffer needs space for additional 4 + * bytes for the DOE header. Table data starts afterwards. + */ + buf = devm_kzalloc(dev, sizeof(*buf) + length, GFP_KERNEL); + if (!buf) + goto err; + + table_length = length; - rc = cxl_cdat_read_table(dev, cdat_doe, cdat_buf, &cdat_length); + rc = cxl_cdat_read_table(dev, doe_mb, buf, &length); if (rc) goto err; - cdat_table = cdat_buf + sizeof(__le32); - if (cdat_checksum(cdat_table, cdat_length)) + if (table_length != length) + dev_warn(dev, "Malformed CDAT table length (%zu:%zu), discarding trailing data\n", + table_length, length); + + if (cdat_checksum(buf->data, length)) goto err; - port->cdat.table = cdat_table; - port->cdat.length = cdat_length; - return; + port->cdat.table = buf->data; + port->cdat.length = length; + return; err: /* Don't leave table data allocated on error */ - devm_kfree(dev, cdat_buf); + devm_kfree(dev, buf); dev_err(dev, "Failed to read/validate CDAT.\n"); } EXPORT_SYMBOL_NS_GPL(read_cdat_data, CXL); @@ -1034,3 +1045,32 @@ long cxl_pci_get_latency(struct pci_dev *pdev) return cxl_flit_size(pdev) * MEGA / bw; } + +static int __cxl_endpoint_decoder_reset_detected(struct device *dev, void *data) +{ + struct cxl_port *port = data; + struct cxl_decoder *cxld; + struct cxl_hdm *cxlhdm; + void __iomem *hdm; + u32 ctrl; + + if (!is_endpoint_decoder(dev)) + return 0; + + cxld = to_cxl_decoder(dev); + if ((cxld->flags & CXL_DECODER_F_ENABLE) == 0) + return 0; + + cxlhdm = dev_get_drvdata(&port->dev); + hdm = cxlhdm->regs.hdm_decoder; + ctrl = readl(hdm + CXL_HDM_DECODER0_CTRL_OFFSET(cxld->id)); + + return !FIELD_GET(CXL_HDM_DECODER0_CTRL_COMMITTED, ctrl); +} + +bool cxl_endpoint_decoder_reset_detected(struct cxl_port *port) +{ + return device_for_each_child(&port->dev, port, + __cxl_endpoint_decoder_reset_detected); +} +EXPORT_SYMBOL_NS_GPL(cxl_endpoint_decoder_reset_detected, CXL); |