diff options
Diffstat (limited to 'src/acpi/acpigen_pci.c')
| -rw-r--r-- | src/acpi/acpigen_pci.c | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/src/acpi/acpigen_pci.c b/src/acpi/acpigen_pci.c index 3edf0d0342..a23b84c39f 100644 --- a/src/acpi/acpigen_pci.c +++ b/src/acpi/acpigen_pci.c @@ -55,3 +55,308 @@ void acpigen_write_PRT_source_entry(unsigned int pci_dev, unsigned int acpi_pin, acpigen_pop_len(); /* Package */ } + +#define PCI_HOST_BRIDGE_OSC_UUID "33db4d5b-1ff7-401c-9657-7441c03dd766" +#define CXL_HOST_BRIDGE_OSC_UUID "68f2d50b-c469-4d8a-bd3d-941a103fd3fc" + +#define OSC_RET_FAILURE 0x02 +#define OSC_RET_UNRECOGNIZED_UUID 0x04 +#define OSC_RET_UNRECOGNIZED_REV 0x08 +#define OSC_RET_CAPABILITIES_MASKED 0x10 + +#define OSC_QUERY_SUPPORT_SET 0x01 + +#define ASL_UUID_UNHANDLED 0x00 +#define ASL_UUID_HANDLED 0x01 + +static void acpigen_OSC_handle_pcie_request(const struct device *domain); +static void acpigen_OSC_handle_cxl_request(const struct device *domain); + +/* + * acpigen_write_OSC_pci_domain + * + * Reference: + * 6.2.11 in https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/06_Device_Configuration/Device_Configuration.html + * + * _OSC ASL Arguments: (4) + * Arg0 - A Buffer containing a UUID + * Arg1 - An Integer containing a Revision ID of the buffer format + * Arg2 - An Integer containing a count of entries in Arg3 + * Arg3 - A Buffer containing a list of DWORD capabilities + * + * _OSC ASL Return Value: + * A Buffer containing a list of capabilities + * + * Local Variables Assignment: + * Local0 - Temp assigned + * Local1 - Temp assigned + * Local2 - Not used + * Local3 - Not used + * Local4 - Not used + * Local5 - Not used + * Local6 - Record whether the UUID is handled + * Local7 - Backs up the input value of Arg3 + * + * Field Definitions: + * Name - Width Source Offset Description + * -------------------------------- + * QSUP - DWord Local7 0x00 Query support + * RETE - DWord Arg3 0x00 Returned errors + * SUPP - Dword Arg3 0x04 PCIe Features that OS supported + * CTRL - Dword Arg3 0x08 PCIe Features that firmware grant control to OS + * OTRL - Dword Local7 0x08 PCIe Features that OS requests for control + * SUPC - Dword Arg3 0x0C CXL Features that OS supported + * CTRC - Dword Arg3 0x10 CXL Features that firmware grant control to OS + * OTRC - Dword Local7 0x10 CXL Features that OS requests for control + */ +void acpigen_write_OSC_pci_domain(const struct device *domain, const bool is_cxl_domain) +{ + /* + * Method (_OSC, 4, NotSerialized) + * { + */ + acpigen_write_method("_OSC", 4); + + /* + * // + * // Check revision ID + * // + * If (Arg1 != 1) + * { + * RETE = OSC_RET_UNRECOGNIZED_REV + * Return (Arg3) + * } + */ + acpigen_write_if(); + acpigen_emit_byte(LNOT_OP); + acpigen_emit_byte(LEQUAL_OP); + acpigen_emit_byte(ARG1_OP); + acpigen_write_integer(0x1); + + acpigen_write_store_int_to_namestr(OSC_RET_UNRECOGNIZED_REV, "RETE"); + acpigen_write_return_op(ARG3_OP); + + acpigen_write_if_end(); + + /* + * // + * // Setup up local variables + * // + * Local7 = Arg3 + * CreateDwordField (Local7, 0x00, QSUP) + * CreateDWordField (Arg3, 0x00, RETE) + * RETE = 0x0 + * Local6 = ASL_UUID_UNHANDLED + */ + acpigen_write_store_ops(ARG3_OP, LOCAL7_OP); + acpigen_write_create_dword_field(LOCAL7_OP, 0x00, "QSUP"); + acpigen_write_create_dword_field(ARG3_OP, 0x00, "RETE"); + acpigen_write_store_int_to_namestr(0x0, "RETE"); + acpigen_write_store_int_to_op(ASL_UUID_UNHANDLED, LOCAL6_OP); + + /* + * // + * // Refer to CXL-3.1-Specification, 9.18.2 + * // A CXL Host Bridge also originates a PCIe hierarchy and will have a + * // _CID of EISAID("PNP0A08"). As such, a CXL Host Bridge device may expose + * // both CXL _OSC and PCIe _OSC. + * // + * + * If (Arg0 == ToUUID (PCI_HOST_BRIDGE_OSC_UUID)) + * { + * // + * // Handle PCIe _OSC request + * // Mark UUID handled + * // + * } + */ + acpigen_write_if(); + acpigen_emit_byte(LEQUAL_OP); + acpigen_emit_byte(ARG0_OP); + acpigen_write_uuid(PCI_HOST_BRIDGE_OSC_UUID); + + acpigen_OSC_handle_pcie_request(domain); + acpigen_write_store_int_to_op(ASL_UUID_HANDLED, LOCAL6_OP); + + acpigen_write_if_end(); + + if (is_cxl_domain) { + /* + * If (Arg0 == ToUUID (CXL_HOST_BRIDGE_OSC_UUID)) + * { + * // + * // Handle CXL _OSC request + * // Mark UUID handled + * // + * } + */ + acpigen_write_if(); + acpigen_emit_byte(LEQUAL_OP); + acpigen_emit_byte(ARG0_OP); + acpigen_write_uuid(CXL_HOST_BRIDGE_OSC_UUID); + + acpigen_OSC_handle_cxl_request(domain); + acpigen_write_store_int_to_op(ASL_UUID_HANDLED, LOCAL6_OP); + + acpigen_write_if_end(); + } + + /* + * // + * // Handle unrecognized UUID + * // + * If (Local6 == ASL_UUID_UNHANDLED) + * { + * RETE = OSC_RET_UNRECOGNIZED_UUID + * } + */ + acpigen_write_if_lequal_op_int(LOCAL6_OP, ASL_UUID_UNHANDLED); + acpigen_write_store_int_to_namestr(OSC_RET_UNRECOGNIZED_UUID, "RETE"); + acpigen_write_if_end(); + + /* + * // + * // All done, return + * // + * Return (Arg3) + */ + acpigen_write_return_op(ARG3_OP); + + /* + * } // Method (_OSC, 4, NotSerialized) + */ + acpigen_pop_len(); + +} + +void acpigen_OSC_handle_pcie_request(const struct device *domain) +{ + uint32_t osc_features = soc_get_granted_pci_features(domain); + + /* + * If (Arg2 < 2)) + * { + * RETE = OSC_RET_FAILURE + * Return (Arg3) + * } + */ + acpigen_write_if(); + acpigen_emit_byte(LLESS_OP); + acpigen_emit_byte(ARG2_OP); + acpigen_write_integer(0x2); + + acpigen_write_store_int_to_namestr(OSC_RET_FAILURE, "RETE"); + acpigen_write_return_op(ARG3_OP); + + acpigen_write_if_end(); + + /* + * CreateDWordField (Arg3, 0x04, SUPP) + * CreateDWordField (Arg3, 0x08, CTRL) + * CreateDWordField (Local7, 0x08, OTRL) + */ + acpigen_write_create_dword_field(ARG3_OP, 0x04, "SUPP"); + acpigen_write_create_dword_field(ARG3_OP, 0x08, "CTRL"); + acpigen_write_create_dword_field(LOCAL7_OP, 0x08, "OTRL"); + + /* + * // Grant PCIe feature controls to OS + * CTRL &= osc_features + */ + acpigen_write_to_integer_from_namestring("CTRL", LOCAL0_OP); + acpigen_write_store_int_to_op(osc_features, LOCAL1_OP); + acpigen_write_and(LOCAL0_OP, LOCAL1_OP, LOCAL0_OP); + acpigen_write_store_op_to_namestr(LOCAL0_OP, "CTRL"); + + /* + * If (CTRL != OTRL) + * { + * RETE = OSC_RET_CAPABILITIES_MASKED + * } + */ + acpigen_write_if(); + acpigen_emit_byte(LNOT_OP); + acpigen_emit_byte(LEQUAL_OP); + acpigen_emit_namestring("CTRL"); + acpigen_emit_namestring("OTRL"); + acpigen_write_store_int_to_namestr(OSC_RET_CAPABILITIES_MASKED, "RETE"); + acpigen_write_if_end(); +}; + +void acpigen_OSC_handle_cxl_request(const struct device *domain) +{ + uint32_t osc_features = soc_get_granted_cxl_features(domain); + + /* + * If (Arg2 < 4)) + * { + * RETE = OSC_RET_FAILURE + * Return (Arg3) + * } + */ + acpigen_write_if(); + acpigen_emit_byte(LLESS_OP); + acpigen_emit_byte(ARG2_OP); + acpigen_write_integer(0x4); + + acpigen_write_store_int_to_namestr(OSC_RET_FAILURE, "RETE"); + acpigen_write_return_op(ARG3_OP); + + acpigen_write_if_end(); + + /* + * CreateDWordField (Arg3, 0x0C, SUPC) + * CreateDWordField (Arg3, 0x10, CTRC) + * CreateDWordField (Local7, 0x10, OTRC) + */ + acpigen_write_create_dword_field(ARG3_OP, 0x0C, "SUPC"); + acpigen_write_create_dword_field(ARG3_OP, 0x10, "CTRC"); + acpigen_write_create_dword_field(LOCAL7_OP, 0x10, "OTRC"); + + /* + * // Grant CXL feature controls to OS + * CTRC &= osc_features + */ + acpigen_write_to_integer_from_namestring("CTRC", LOCAL0_OP); + acpigen_write_store_int_to_op(osc_features, LOCAL1_OP); + acpigen_write_and(LOCAL0_OP, LOCAL1_OP, LOCAL0_OP); + acpigen_write_store_op_to_namestr(LOCAL0_OP, "CTRC"); + + /* + * If (CTRC != OTRC) + * { + * RETE = OSC_RET_CAPABILITIES_MASKED + * } + */ + acpigen_write_if(); + acpigen_emit_byte(LNOT_OP); + acpigen_emit_byte(LEQUAL_OP); + acpigen_emit_namestring("CTRC"); + acpigen_emit_namestring("OTRC"); + acpigen_write_store_int_to_namestr(OSC_RET_CAPABILITIES_MASKED, "RETE"); + acpigen_write_if_end(); +}; + +__weak uint32_t soc_get_granted_pci_features(const struct device *domain) +{ + /* + * By default grant no features to OS, which equals to the case where _OSC + * is absent. + * + * Refer to PCI firmware specification, revision 3.1. + * If the _OSC control method is absent from the scope of a host bridge device, then + * the operating system must not enable or attempt to use any features defined in this + * section for the hierarchy originated by the host bridge. Doing so could contend with + * platform firmware operations or produce undesired results. + */ + return 0; +} + +__weak uint32_t soc_get_granted_cxl_features(const struct device *domain) +{ + /* + * By default grant no features to OS, which equals to the case where _OSC + * is absent. + */ + return 0; +} |