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Message-ID: <750a363b-8645-4115-a6a4-757941992330@amd.com>
Date: Wed, 10 Sep 2025 13:11:47 -0500
From: "Bowman, Terry" <terry.bowman@....com>
To: Dave Jiang <dave.jiang@...el.com>, dave@...olabs.net,
jonathan.cameron@...wei.com, alison.schofield@...el.com,
dan.j.williams@...el.com, bhelgaas@...gle.com, shiju.jose@...wei.com,
ming.li@...omail.com, Smita.KoralahalliChannabasappa@....com,
rrichter@....com, dan.carpenter@...aro.org,
PradeepVineshReddy.Kodamati@....com, lukas@...ner.de,
Benjamin.Cheatham@....com, sathyanarayanan.kuppuswamy@...ux.intel.com,
linux-cxl@...r.kernel.org, alucerop@....com, ira.weiny@...el.com
Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v11 07/23] CXL/PCI: Move CXL DVSEC definitions into
uapi/linux/pci_regs.h
On 8/28/2025 4:07 PM, Dave Jiang wrote:
>
> On 8/26/25 6:35 PM, Terry Bowman wrote:
>> The CXL DVSECs are currently defined in cxl/core/cxlpci.h. These are not
>> accessible to other subsystems.
>>
>> Change DVSEC name formatting to follow the existing PCI format in
>> pci_regs.h. The current format uses CXL_DVSEC_XYZ. Change to be PCI_DVSEC_CXL_XYZ.
> I don't think renaming is necessary. Especially changing all the existing CXL code. CXL isn't exactly considered a subset of PCI (not part of PCI consortium). IMO it may be better to leave it as it was. Maybe others have different opinions.
>
> DJ
>
Hi Dave,
This was requested by Dan Williams during v10 review:
https://lore.kernel.org/linux-cxl/6881626a784f_134cc7100b4@dwillia2-xfh.jf.intel.com.notmuch/
Let me know how to proceed.
Terry
>> Update existing occurrences to match the name change.
>>
>> Update the inline documentation to refer to latest CXL spec version.
>>
>> Signed-off-by: Terry Bowman <terry.bowman@....com>
>> ---
>> drivers/cxl/core/pci.c | 62 +++++++++++++++++------------------
>> drivers/cxl/core/regs.c | 12 +++----
>> drivers/cxl/cxlpci.h | 53 ------------------------------
>> drivers/cxl/pci.c | 2 +-
>> drivers/pci/pci.c | 18 +++++-----
>> include/uapi/linux/pci_regs.h | 60 ++++++++++++++++++++++++++++++---
>> 6 files changed, 104 insertions(+), 103 deletions(-)
>>
>> diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
>> index a3aef78f903a..d677691f8a05 100644
>> --- a/drivers/cxl/core/pci.c
>> +++ b/drivers/cxl/core/pci.c
>> @@ -110,19 +110,19 @@ static int cxl_dvsec_mem_range_valid(struct cxl_dev_state *cxlds, int id)
>> int rc, i;
>> u32 temp;
>>
>> - if (id > CXL_DVSEC_RANGE_MAX)
>> + if (id > PCI_DVSEC_CXL_RANGE_MAX)
>> return -EINVAL;
>>
>> /* Check MEM INFO VALID bit first, give up after 1s */
>> i = 1;
>> do {
>> rc = pci_read_config_dword(pdev,
>> - d + CXL_DVSEC_RANGE_SIZE_LOW(id),
>> + d + PCI_DVSEC_CXL_RANGE_SIZE_LOW(id),
>> &temp);
>> if (rc)
>> return rc;
>>
>> - valid = FIELD_GET(CXL_DVSEC_MEM_INFO_VALID, temp);
>> + valid = FIELD_GET(PCI_DVSEC_CXL_MEM_INFO_VALID, temp);
>> if (valid)
>> break;
>> msleep(1000);
>> @@ -146,17 +146,17 @@ static int cxl_dvsec_mem_range_active(struct cxl_dev_state *cxlds, int id)
>> int rc, i;
>> u32 temp;
>>
>> - if (id > CXL_DVSEC_RANGE_MAX)
>> + if (id > PCI_DVSEC_CXL_RANGE_MAX)
>> return -EINVAL;
>>
>> /* Check MEM ACTIVE bit, up to 60s timeout by default */
>> for (i = media_ready_timeout; i; i--) {
>> rc = pci_read_config_dword(
>> - pdev, d + CXL_DVSEC_RANGE_SIZE_LOW(id), &temp);
>> + pdev, d + PCI_DVSEC_CXL_RANGE_SIZE_LOW(id), &temp);
>> if (rc)
>> return rc;
>>
>> - active = FIELD_GET(CXL_DVSEC_MEM_ACTIVE, temp);
>> + active = FIELD_GET(PCI_DVSEC_CXL_MEM_ACTIVE, temp);
>> if (active)
>> break;
>> msleep(1000);
>> @@ -185,11 +185,11 @@ int cxl_await_media_ready(struct cxl_dev_state *cxlds)
>> u16 cap;
>>
>> rc = pci_read_config_word(pdev,
>> - d + CXL_DVSEC_CAP_OFFSET, &cap);
>> + d + PCI_DVSEC_CXL_CAP_OFFSET, &cap);
>> if (rc)
>> return rc;
>>
>> - hdm_count = FIELD_GET(CXL_DVSEC_HDM_COUNT_MASK, cap);
>> + hdm_count = FIELD_GET(PCI_DVSEC_CXL_HDM_COUNT_MASK, cap);
>> for (i = 0; i < hdm_count; i++) {
>> rc = cxl_dvsec_mem_range_valid(cxlds, i);
>> if (rc)
>> @@ -217,16 +217,16 @@ static int cxl_set_mem_enable(struct cxl_dev_state *cxlds, u16 val)
>> u16 ctrl;
>> int rc;
>>
>> - rc = pci_read_config_word(pdev, d + CXL_DVSEC_CTRL_OFFSET, &ctrl);
>> + rc = pci_read_config_word(pdev, d + PCI_DVSEC_CXL_CTRL_OFFSET, &ctrl);
>> if (rc < 0)
>> return rc;
>>
>> - if ((ctrl & CXL_DVSEC_MEM_ENABLE) == val)
>> + if ((ctrl & PCI_DVSEC_CXL_MEM_ENABLE) == val)
>> return 1;
>> - ctrl &= ~CXL_DVSEC_MEM_ENABLE;
>> + ctrl &= ~PCI_DVSEC_CXL_MEM_ENABLE;
>> ctrl |= val;
>>
>> - rc = pci_write_config_word(pdev, d + CXL_DVSEC_CTRL_OFFSET, ctrl);
>> + rc = pci_write_config_word(pdev, d + PCI_DVSEC_CXL_CTRL_OFFSET, ctrl);
>> if (rc < 0)
>> return rc;
>>
>> @@ -242,7 +242,7 @@ static int devm_cxl_enable_mem(struct device *host, struct cxl_dev_state *cxlds)
>> {
>> int rc;
>>
>> - rc = cxl_set_mem_enable(cxlds, CXL_DVSEC_MEM_ENABLE);
>> + rc = cxl_set_mem_enable(cxlds, PCI_DVSEC_CXL_MEM_ENABLE);
>> if (rc < 0)
>> return rc;
>> if (rc > 0)
>> @@ -304,11 +304,11 @@ int cxl_dvsec_rr_decode(struct cxl_dev_state *cxlds,
>> return -ENXIO;
>> }
>>
>> - rc = pci_read_config_word(pdev, d + CXL_DVSEC_CAP_OFFSET, &cap);
>> + rc = pci_read_config_word(pdev, d + PCI_DVSEC_CXL_CAP_OFFSET, &cap);
>> if (rc)
>> return rc;
>>
>> - if (!(cap & CXL_DVSEC_MEM_CAPABLE)) {
>> + if (!(cap & PCI_DVSEC_CXL_MEM_CAPABLE)) {
>> dev_dbg(dev, "Not MEM Capable\n");
>> return -ENXIO;
>> }
>> @@ -319,7 +319,7 @@ int cxl_dvsec_rr_decode(struct cxl_dev_state *cxlds,
>> * driver is for a spec defined class code which must be CXL.mem
>> * capable, there is no point in continuing to enable CXL.mem.
>> */
>> - hdm_count = FIELD_GET(CXL_DVSEC_HDM_COUNT_MASK, cap);
>> + hdm_count = FIELD_GET(PCI_DVSEC_CXL_HDM_COUNT_MASK, cap);
>> if (!hdm_count || hdm_count > 2)
>> return -EINVAL;
>>
>> @@ -328,11 +328,11 @@ int cxl_dvsec_rr_decode(struct cxl_dev_state *cxlds,
>> * disabled, and they will remain moot after the HDM Decoder
>> * capability is enabled.
>> */
>> - rc = pci_read_config_word(pdev, d + CXL_DVSEC_CTRL_OFFSET, &ctrl);
>> + rc = pci_read_config_word(pdev, d + PCI_DVSEC_CXL_CTRL_OFFSET, &ctrl);
>> if (rc)
>> return rc;
>>
>> - info->mem_enabled = FIELD_GET(CXL_DVSEC_MEM_ENABLE, ctrl);
>> + info->mem_enabled = FIELD_GET(PCI_DVSEC_CXL_MEM_ENABLE, ctrl);
>> if (!info->mem_enabled)
>> return 0;
>>
>> @@ -345,35 +345,35 @@ int cxl_dvsec_rr_decode(struct cxl_dev_state *cxlds,
>> return rc;
>>
>> rc = pci_read_config_dword(
>> - pdev, d + CXL_DVSEC_RANGE_SIZE_HIGH(i), &temp);
>> + pdev, d + PCI_DVSEC_CXL_RANGE_SIZE_HIGH(i), &temp);
>> if (rc)
>> return rc;
>>
>> size = (u64)temp << 32;
>>
>> rc = pci_read_config_dword(
>> - pdev, d + CXL_DVSEC_RANGE_SIZE_LOW(i), &temp);
>> + pdev, d + PCI_DVSEC_CXL_RANGE_SIZE_LOW(i), &temp);
>> if (rc)
>> return rc;
>>
>> - size |= temp & CXL_DVSEC_MEM_SIZE_LOW_MASK;
>> + size |= temp & PCI_DVSEC_CXL_MEM_SIZE_LOW_MASK;
>> if (!size) {
>> continue;
>> }
>>
>> rc = pci_read_config_dword(
>> - pdev, d + CXL_DVSEC_RANGE_BASE_HIGH(i), &temp);
>> + pdev, d + PCI_DVSEC_CXL_RANGE_BASE_HIGH(i), &temp);
>> if (rc)
>> return rc;
>>
>> base = (u64)temp << 32;
>>
>> rc = pci_read_config_dword(
>> - pdev, d + CXL_DVSEC_RANGE_BASE_LOW(i), &temp);
>> + pdev, d + PCI_DVSEC_CXL_RANGE_BASE_LOW(i), &temp);
>> if (rc)
>> return rc;
>>
>> - base |= temp & CXL_DVSEC_MEM_BASE_LOW_MASK;
>> + base |= temp & PCI_DVSEC_CXL_MEM_BASE_LOW_MASK;
>>
>> info->dvsec_range[ranges++] = (struct range) {
>> .start = base,
>> @@ -781,7 +781,7 @@ u16 cxl_gpf_get_dvsec(struct device *dev)
>> is_port = false;
>>
>> dvsec = pci_find_dvsec_capability(pdev, PCI_VENDOR_ID_CXL,
>> - is_port ? CXL_DVSEC_PORT_GPF : CXL_DVSEC_DEVICE_GPF);
>> + is_port ? PCI_DVSEC_CXL_PORT_GPF : PCI_DVSEC_CXL_DEVICE_GPF);
>> if (!dvsec)
>> dev_warn(dev, "%s GPF DVSEC not present\n",
>> is_port ? "Port" : "Device");
>> @@ -797,14 +797,14 @@ static int update_gpf_port_dvsec(struct pci_dev *pdev, int dvsec, int phase)
>>
>> switch (phase) {
>> case 1:
>> - offset = CXL_DVSEC_PORT_GPF_PHASE_1_CONTROL_OFFSET;
>> - base = CXL_DVSEC_PORT_GPF_PHASE_1_TMO_BASE_MASK;
>> - scale = CXL_DVSEC_PORT_GPF_PHASE_1_TMO_SCALE_MASK;
>> + offset = PCI_DVSEC_CXL_PORT_GPF_PHASE_1_CONTROL_OFFSET;
>> + base = PCI_DVSEC_CXL_PORT_GPF_PHASE_1_TMO_BASE_MASK;
>> + scale = PCI_DVSEC_CXL_PORT_GPF_PHASE_1_TMO_SCALE_MASK;
>> break;
>> case 2:
>> - offset = CXL_DVSEC_PORT_GPF_PHASE_2_CONTROL_OFFSET;
>> - base = CXL_DVSEC_PORT_GPF_PHASE_2_TMO_BASE_MASK;
>> - scale = CXL_DVSEC_PORT_GPF_PHASE_2_TMO_SCALE_MASK;
>> + offset = PCI_DVSEC_CXL_PORT_GPF_PHASE_2_CONTROL_OFFSET;
>> + base = PCI_DVSEC_CXL_PORT_GPF_PHASE_2_TMO_BASE_MASK;
>> + scale = PCI_DVSEC_CXL_PORT_GPF_PHASE_2_TMO_SCALE_MASK;
>> break;
>> default:
>> return -EINVAL;
>> diff --git a/drivers/cxl/core/regs.c b/drivers/cxl/core/regs.c
>> index 5ca7b0eed568..fb70ffbba72d 100644
>> --- a/drivers/cxl/core/regs.c
>> +++ b/drivers/cxl/core/regs.c
>> @@ -271,10 +271,10 @@ EXPORT_SYMBOL_NS_GPL(cxl_map_device_regs, "CXL");
>> static bool cxl_decode_regblock(struct pci_dev *pdev, u32 reg_lo, u32 reg_hi,
>> struct cxl_register_map *map)
>> {
>> - u8 reg_type = FIELD_GET(CXL_DVSEC_REG_LOCATOR_BLOCK_ID_MASK, reg_lo);
>> - int bar = FIELD_GET(CXL_DVSEC_REG_LOCATOR_BIR_MASK, reg_lo);
>> + u8 reg_type = FIELD_GET(PCI_DVSEC_CXL_REG_LOCATOR_BLOCK_ID_MASK, reg_lo);
>> + int bar = FIELD_GET(PCI_DVSEC_CXL_REG_LOCATOR_BIR_MASK, reg_lo);
>> u64 offset = ((u64)reg_hi << 32) |
>> - (reg_lo & CXL_DVSEC_REG_LOCATOR_BLOCK_OFF_LOW_MASK);
>> + (reg_lo & PCI_DVSEC_CXL_REG_LOCATOR_BLOCK_OFF_LOW_MASK);
>>
>> if (offset > pci_resource_len(pdev, bar)) {
>> dev_warn(&pdev->dev,
>> @@ -311,15 +311,15 @@ static int __cxl_find_regblock_instance(struct pci_dev *pdev, enum cxl_regloc_ty
>> };
>>
>> regloc = pci_find_dvsec_capability(pdev, PCI_VENDOR_ID_CXL,
>> - CXL_DVSEC_REG_LOCATOR);
>> + PCI_DVSEC_CXL_REG_LOCATOR);
>> if (!regloc)
>> return -ENXIO;
>>
>> pci_read_config_dword(pdev, regloc + PCI_DVSEC_HEADER1, ®loc_size);
>> regloc_size = FIELD_GET(PCI_DVSEC_HEADER1_LENGTH_MASK, regloc_size);
>>
>> - regloc += CXL_DVSEC_REG_LOCATOR_BLOCK1_OFFSET;
>> - regblocks = (regloc_size - CXL_DVSEC_REG_LOCATOR_BLOCK1_OFFSET) / 8;
>> + regloc += PCI_DVSEC_CXL_REG_LOCATOR_BLOCK1_OFFSET;
>> + regblocks = (regloc_size - PCI_DVSEC_CXL_REG_LOCATOR_BLOCK1_OFFSET) / 8;
>>
>> for (i = 0; i < regblocks; i++, regloc += 8) {
>> u32 reg_lo, reg_hi;
>> diff --git a/drivers/cxl/cxlpci.h b/drivers/cxl/cxlpci.h
>> index 3959fa7e2ead..ad24d81e9eaa 100644
>> --- a/drivers/cxl/cxlpci.h
>> +++ b/drivers/cxl/cxlpci.h
>> @@ -7,59 +7,6 @@
>>
>> #define CXL_MEMORY_PROGIF 0x10
>>
>> -/*
>> - * See section 8.1 Configuration Space Registers in the CXL 2.0
>> - * Specification. Names are taken straight from the specification with "CXL" and
>> - * "DVSEC" redundancies removed. When obvious, abbreviations may be used.
>> - */
>> -#define PCI_DVSEC_HEADER1_LENGTH_MASK GENMASK(31, 20)
>> -
>> -/* CXL 2.0 8.1.3: PCIe DVSEC for CXL Device */
>> -#define CXL_DVSEC_PCIE_DEVICE 0
>> -#define CXL_DVSEC_CAP_OFFSET 0xA
>> -#define CXL_DVSEC_MEM_CAPABLE BIT(2)
>> -#define CXL_DVSEC_HDM_COUNT_MASK GENMASK(5, 4)
>> -#define CXL_DVSEC_CTRL_OFFSET 0xC
>> -#define CXL_DVSEC_MEM_ENABLE BIT(2)
>> -#define CXL_DVSEC_RANGE_SIZE_HIGH(i) (0x18 + (i * 0x10))
>> -#define CXL_DVSEC_RANGE_SIZE_LOW(i) (0x1C + (i * 0x10))
>> -#define CXL_DVSEC_MEM_INFO_VALID BIT(0)
>> -#define CXL_DVSEC_MEM_ACTIVE BIT(1)
>> -#define CXL_DVSEC_MEM_SIZE_LOW_MASK GENMASK(31, 28)
>> -#define CXL_DVSEC_RANGE_BASE_HIGH(i) (0x20 + (i * 0x10))
>> -#define CXL_DVSEC_RANGE_BASE_LOW(i) (0x24 + (i * 0x10))
>> -#define CXL_DVSEC_MEM_BASE_LOW_MASK GENMASK(31, 28)
>> -
>> -#define CXL_DVSEC_RANGE_MAX 2
>> -
>> -/* CXL 2.0 8.1.4: Non-CXL Function Map DVSEC */
>> -#define CXL_DVSEC_FUNCTION_MAP 2
>> -
>> -/* CXL 2.0 8.1.5: CXL 2.0 Extensions DVSEC for Ports */
>> -#define CXL_DVSEC_PORT_EXTENSIONS 3
>> -
>> -/* CXL 2.0 8.1.6: GPF DVSEC for CXL Port */
>> -#define CXL_DVSEC_PORT_GPF 4
>> -#define CXL_DVSEC_PORT_GPF_PHASE_1_CONTROL_OFFSET 0x0C
>> -#define CXL_DVSEC_PORT_GPF_PHASE_1_TMO_BASE_MASK GENMASK(3, 0)
>> -#define CXL_DVSEC_PORT_GPF_PHASE_1_TMO_SCALE_MASK GENMASK(11, 8)
>> -#define CXL_DVSEC_PORT_GPF_PHASE_2_CONTROL_OFFSET 0xE
>> -#define CXL_DVSEC_PORT_GPF_PHASE_2_TMO_BASE_MASK GENMASK(3, 0)
>> -#define CXL_DVSEC_PORT_GPF_PHASE_2_TMO_SCALE_MASK GENMASK(11, 8)
>> -
>> -/* CXL 2.0 8.1.7: GPF DVSEC for CXL Device */
>> -#define CXL_DVSEC_DEVICE_GPF 5
>> -
>> -/* CXL 2.0 8.1.8: PCIe DVSEC for Flex Bus Port */
>> -#define CXL_DVSEC_PCIE_FLEXBUS_PORT 7
>> -
>> -/* CXL 2.0 8.1.9: Register Locator DVSEC */
>> -#define CXL_DVSEC_REG_LOCATOR 8
>> -#define CXL_DVSEC_REG_LOCATOR_BLOCK1_OFFSET 0xC
>> -#define CXL_DVSEC_REG_LOCATOR_BIR_MASK GENMASK(2, 0)
>> -#define CXL_DVSEC_REG_LOCATOR_BLOCK_ID_MASK GENMASK(15, 8)
>> -#define CXL_DVSEC_REG_LOCATOR_BLOCK_OFF_LOW_MASK GENMASK(31, 16)
>> -
>> /*
>> * NOTE: Currently all the functions which are enabled for CXL require their
>> * vectors to be in the first 16. Use this as the default max.
>> diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
>> index bd100ac31672..bd95be1f3d5c 100644
>> --- a/drivers/cxl/pci.c
>> +++ b/drivers/cxl/pci.c
>> @@ -933,7 +933,7 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>> cxlds->rcd = is_cxl_restricted(pdev);
>> cxlds->serial = pci_get_dsn(pdev);
>> cxlds->cxl_dvsec = pci_find_dvsec_capability(
>> - pdev, PCI_VENDOR_ID_CXL, CXL_DVSEC_PCIE_DEVICE);
>> + pdev, PCI_VENDOR_ID_CXL, PCI_DVSEC_CXL_DEVICE);
>> if (!cxlds->cxl_dvsec)
>> dev_warn(&pdev->dev,
>> "Device DVSEC not present, skip CXL.mem init\n");
>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
>> index 9e42090fb108..d775ed37a79b 100644
>> --- a/drivers/pci/pci.c
>> +++ b/drivers/pci/pci.c
>> @@ -5031,7 +5031,7 @@ static int pci_dev_reset_slot_function(struct pci_dev *dev, bool probe)
>> static u16 cxl_port_dvsec(struct pci_dev *dev)
>> {
>> return pci_find_dvsec_capability(dev, PCI_VENDOR_ID_CXL,
>> - PCI_DVSEC_CXL_PORT);
>> + PCI_DVSEC_CXL_PORT_EXT);
>> }
>>
>> static bool cxl_sbr_masked(struct pci_dev *dev)
>> @@ -5043,7 +5043,9 @@ static bool cxl_sbr_masked(struct pci_dev *dev)
>> if (!dvsec)
>> return false;
>>
>> - rc = pci_read_config_word(dev, dvsec + PCI_DVSEC_CXL_PORT_CTL, ®);
>> + rc = pci_read_config_word(dev,
>> + dvsec + PCI_DVSEC_CXL_PORT_EXT_CTL_OFFSET,
>> + ®);
>> if (rc || PCI_POSSIBLE_ERROR(reg))
>> return false;
>>
>> @@ -5052,7 +5054,7 @@ static bool cxl_sbr_masked(struct pci_dev *dev)
>> * bit in Bridge Control has no effect. When 1, the Port generates
>> * hot reset when the SBR bit is set to 1.
>> */
>> - if (reg & PCI_DVSEC_CXL_PORT_CTL_UNMASK_SBR)
>> + if (reg & PCI_DVSEC_CXL_PORT_EXT_CTL_UNMASK_SBR)
>> return false;
>>
>> return true;
>> @@ -5097,22 +5099,22 @@ static int cxl_reset_bus_function(struct pci_dev *dev, bool probe)
>> if (probe)
>> return 0;
>>
>> - rc = pci_read_config_word(bridge, dvsec + PCI_DVSEC_CXL_PORT_CTL, ®);
>> + rc = pci_read_config_word(bridge, dvsec + PCI_DVSEC_CXL_PORT_EXT_CTL_OFFSET, ®);
>> if (rc)
>> return -ENOTTY;
>>
>> - if (reg & PCI_DVSEC_CXL_PORT_CTL_UNMASK_SBR) {
>> + if (reg & PCI_DVSEC_CXL_PORT_EXT_CTL_UNMASK_SBR) {
>> val = reg;
>> } else {
>> - val = reg | PCI_DVSEC_CXL_PORT_CTL_UNMASK_SBR;
>> - pci_write_config_word(bridge, dvsec + PCI_DVSEC_CXL_PORT_CTL,
>> + val = reg | PCI_DVSEC_CXL_PORT_EXT_CTL_UNMASK_SBR;
>> + pci_write_config_word(bridge, dvsec + PCI_DVSEC_CXL_PORT_EXT_CTL_OFFSET,
>> val);
>> }
>>
>> rc = pci_reset_bus_function(dev, probe);
>>
>> if (reg != val)
>> - pci_write_config_word(bridge, dvsec + PCI_DVSEC_CXL_PORT_CTL,
>> + pci_write_config_word(bridge, dvsec + PCI_DVSEC_CXL_PORT_EXT_CTL_OFFSET,
>> reg);
>>
>> return rc;
>> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
>> index a3a3e942dedf..b03244d55aea 100644
>> --- a/include/uapi/linux/pci_regs.h
>> +++ b/include/uapi/linux/pci_regs.h
>> @@ -1225,9 +1225,61 @@
>> /* Deprecated old name, replaced with PCI_DOE_DATA_OBJECT_DISC_RSP_3_TYPE */
>> #define PCI_DOE_DATA_OBJECT_DISC_RSP_3_PROTOCOL PCI_DOE_DATA_OBJECT_DISC_RSP_3_TYPE
>>
>> -/* Compute Express Link (CXL r3.1, sec 8.1.5) */
>> -#define PCI_DVSEC_CXL_PORT 3
>> -#define PCI_DVSEC_CXL_PORT_CTL 0x0c
>> -#define PCI_DVSEC_CXL_PORT_CTL_UNMASK_SBR 0x00000001
>> +/* Compute Express Link (CXL r3.2, sec 8.1)
>> + *
>> + * Note that CXL DVSEC id 3 and 7 to be ignored when the CXL link state
>> + * is "disconnected" (CXL r3.2, sec 9.12.3). Re-enumerate these
>> + * registers on downstream link-up events.
>> + */
>> +
>> +#define PCI_DVSEC_HEADER1_LENGTH_MASK GENMASK(31, 20)
>> +
>> +/* CXL 3.2 8.1.3: PCIe DVSEC for CXL Device */
>> +#define PCI_DVSEC_CXL_DEVICE 0
>> +#define PCI_DVSEC_CXL_CAP_OFFSET 0xA
>> +#define PCI_DVSEC_CXL_MEM_CAPABLE BIT(2)
>> +#define PCI_DVSEC_CXL_HDM_COUNT_MASK GENMASK(5, 4)
>> +#define PCI_DVSEC_CXL_CTRL_OFFSET 0xC
>> +#define PCI_DVSEC_CXL_MEM_ENABLE BIT(2)
>> +#define PCI_DVSEC_CXL_RANGE_SIZE_HIGH(i) (0x18 + (i * 0x10))
>> +#define PCI_DVSEC_CXL_RANGE_SIZE_LOW(i) (0x1C + (i * 0x10))
>> +#define PCI_DVSEC_CXL_MEM_INFO_VALID BIT(0)
>> +#define PCI_DVSEC_CXL_MEM_ACTIVE BIT(1)
>> +#define PCI_DVSEC_CXL_MEM_SIZE_LOW_MASK GENMASK(31, 28)
>> +#define PCI_DVSEC_CXL_RANGE_BASE_HIGH(i) (0x20 + (i * 0x10))
>> +#define PCI_DVSEC_CXL_RANGE_BASE_LOW(i) (0x24 + (i * 0x10))
>> +#define PCI_DVSEC_CXL_MEM_BASE_LOW_MASK GENMASK(31, 28)
>> +
>> +#define PCI_DVSEC_CXL_RANGE_MAX 2
>> +
>> +/* CXL 3.2 8.1.4: Non-CXL Function Map DVSEC */
>> +#define PCI_DVSEC_CXL_FUNCTION_MAP 2
>> +
>> +/* CXL 3.2 8.1.5: Extensions DVSEC for Ports */
>> +#define PCI_DVSEC_CXL_PORT_EXT 3
>> +#define PCI_DVSEC_CXL_PORT_EXT_CTL_OFFSET 0x0c
>> +#define PCI_DVSEC_CXL_PORT_EXT_CTL_UNMASK_SBR 0x00000001
>> +
>> +/* CXL 3.2 8.1.6: GPF DVSEC for CXL Port */
>> +#define PCI_DVSEC_CXL_PORT_GPF 4
>> +#define PCI_DVSEC_CXL_PORT_GPF_PHASE_1_CONTROL_OFFSET 0x0C
>> +#define PCI_DVSEC_CXL_PORT_GPF_PHASE_1_TMO_BASE_MASK GENMASK(3, 0)
>> +#define PCI_DVSEC_CXL_PORT_GPF_PHASE_1_TMO_SCALE_MASK GENMASK(11, 8)
>> +#define PCI_DVSEC_CXL_PORT_GPF_PHASE_2_CONTROL_OFFSET 0xE
>> +#define PCI_DVSEC_CXL_PORT_GPF_PHASE_2_TMO_BASE_MASK GENMASK(3, 0)
>> +#define PCI_DVSEC_CXL_PORT_GPF_PHASE_2_TMO_SCALE_MASK GENMASK(11, 8)
>> +
>> +/* CXL 3.2 8.1.7: GPF DVSEC for CXL Device */
>> +#define PCI_DVSEC_CXL_DEVICE_GPF 5
>> +
>> +/* CXL 3.2 8.1.8: PCIe DVSEC for Flex Bus Port */
>> +#define PCI_DVSEC_CXL_FLEXBUS_PORT 7
>> +
>> +/* CXL 3.2 8.1.9: Register Locator DVSEC */
>> +#define PCI_DVSEC_CXL_REG_LOCATOR 8
>> +#define PCI_DVSEC_CXL_REG_LOCATOR_BLOCK1_OFFSET 0xC
>> +#define PCI_DVSEC_CXL_REG_LOCATOR_BIR_MASK GENMASK(2, 0)
>> +#define PCI_DVSEC_CXL_REG_LOCATOR_BLOCK_ID_MASK GENMASK(15, 8)
>> +#define PCI_DVSEC_CXL_REG_LOCATOR_BLOCK_OFF_LOW_MASK GENMASK(31, 16)
>>
>> #endif /* LINUX_PCI_REGS_H */
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