acpi: Move ECAM resource below PNP0C02 device in a common place

From the Linux documentation (Documentation/PCI/acpi-info.rst):
[6] PCI Firmware 3.2, sec 4.1.2:
    If the operating system does not natively comprehend reserving the
    MMCFG region, the MMCFG region must be reserved by firmware.  The
    address range reported in the MCFG table or by _CBA method (see Section
    4.1.3) must be reserved by declaring a motherboard resource.  For most
    systems, the motherboard resource would appear at the root of the ACPI
    namespace (under \_SB) in a node with a _HID of EISAID (PNP0C02), and
    the resources in this case should not be claimed in the root PCI bus’s
    _CRS.  The resources can optionally be returned in Int15 E820 or
    EFIGetMemoryMap as reserved memory but must always be reported through
    ACPI as a motherboard resource.

So in order for the OS to use ECAM MMCONF over legacy PCI IO
configuration, a PNP0C02 HID device needs to reserve this region.

As no AMD platform has this defined in DSDT this fixes Linux using
legacy PCI IO configuration over MMCONF. Tianocore messes with e820
table in such a way that it prevents Linux from using PCIe ECAM. This
change fixes that problem.

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Change-Id: I852e393726a1b086cf582f4d2d707e7cde05cbf4
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75729
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

6 files changed, 0 insertions, 31 deletions

diff --git a/src/soc/intel/apollolake/acpi/northbridge.asl b/src/soc/intel/apollolake/acpi/northbridge.asl
index 1b47509094..a304331f1d 100644
--- a/src/soc/intel/apollolake/acpi/northbridge.asl
+++ b/src/soc/intel/apollolake/acpi/northbridge.asl
@@ -116,11 +116,6 @@ Device (PDRC)	/* PCI Device Resource Consumption */
 	{
 		Name (BUF0, ResourceTemplate ()
 		{
-			/* PCI Express BAR */
-			Memory32Fixed (ReadWrite,
-					CONFIG_ECAM_MMCONF_BASE_ADDRESS,
-					CONFIG_ECAM_MMCONF_LENGTH, PCIX)
-
 			/* Local APIC range (0xfee0_0000 to 0xfeef_ffff) */
 			Memory32Fixed (ReadOnly, 0x0fee00000, 0x00010000, LIOH)
 		})
diff --git a/src/soc/intel/baytrail/acpi/southcluster.asl b/src/soc/intel/baytrail/acpi/southcluster.asl
index dacdd29e06..131825e341 100644
--- a/src/soc/intel/baytrail/acpi/southcluster.asl
+++ b/src/soc/intel/baytrail/acpi/southcluster.asl
@@ -189,7 +189,6 @@ Device (PDRC)
 
 	Name (PDRS, ResourceTemplate() {
 		Memory32Fixed(ReadWrite, ABORT_BASE_ADDRESS, ABORT_BASE_SIZE)
-		Memory32Fixed(ReadWrite, CONFIG_ECAM_MMCONF_BASE_ADDRESS, CONFIG_ECAM_MMCONF_LENGTH)
 		Memory32Fixed(ReadWrite, PMC_BASE_ADDRESS, PMC_BASE_SIZE)
 		Memory32Fixed(ReadWrite, ILB_BASE_ADDRESS, ILB_BASE_SIZE)
 		Memory32Fixed(ReadWrite, SPI_BASE_ADDRESS, SPI_BASE_SIZE)
diff --git a/src/soc/intel/braswell/acpi/southcluster.asl b/src/soc/intel/braswell/acpi/southcluster.asl
index 3dcc6c1951..1e52df171f 100644
--- a/src/soc/intel/braswell/acpi/southcluster.asl
+++ b/src/soc/intel/braswell/acpi/southcluster.asl
@@ -188,7 +188,6 @@ Device (PDRC)
 
 	Name (PDRS, ResourceTemplate() {
 		Memory32Fixed(ReadWrite, ABORT_BASE_ADDRESS, ABORT_BASE_SIZE)
-		Memory32Fixed(ReadWrite, CONFIG_ECAM_MMCONF_BASE_ADDRESS, CONFIG_ECAM_MMCONF_LENGTH)
 		Memory32Fixed(ReadWrite, PMC_BASE_ADDRESS, PMC_BASE_SIZE)
 		Memory32Fixed(ReadWrite, ILB_BASE_ADDRESS, ILB_BASE_SIZE)
 		Memory32Fixed(ReadWrite, SPI_BASE_ADDRESS, SPI_BASE_SIZE)
diff --git a/src/soc/intel/common/block/acpi/acpi/northbridge.asl b/src/soc/intel/common/block/acpi/acpi/northbridge.asl
index d605625bc5..44c873c8e5 100644
--- a/src/soc/intel/common/block/acpi/acpi/northbridge.asl
+++ b/src/soc/intel/common/block/acpi/acpi/northbridge.asl
@@ -269,11 +269,6 @@ Device (PDRC)
 			 */
 			Memory32Fixed (ReadWrite, 0, EP_BASE_SIZE, EGPB)
 
-			/* PCI Express BAR _BAS and _LEN will be updated in
-			 * _CRS below according to B0:D0:F0:Reg.60h
-			 */
-			Memory32Fixed (ReadWrite, 0, 0, PCIX)
-
 			/* VTD engine memory range. */
 			Memory32Fixed (ReadOnly, VTD_BASE_ADDRESS, VTD_BASE_SIZE)
 
@@ -301,12 +296,6 @@ Device (PDRC)
 		CreateDwordField (BUF0, EGPB._BAS, EBR0)
 		EBR0 = \_SB.PCI0.GEPB ()
 
-		CreateDwordField (BUF0, PCIX._BAS, XBR0)
-		XBR0 = \_SB.PCI0.GPCB ()
-
-		CreateDwordField (BUF0, PCIX._LEN, XSZ0)
-		XSZ0 = \_SB.PCI0.GPCL ()
-
 		CreateDwordField (BUF0, FIOH._BAS, FBR0)
 		FBR0 = 0x100000000 - CONFIG_ROM_SIZE
 
diff --git a/src/soc/intel/denverton_ns/acpi/northcluster.asl b/src/soc/intel/denverton_ns/acpi/northcluster.asl
index e415dc4ea3..ce687dd384 100644
--- a/src/soc/intel/denverton_ns/acpi/northcluster.asl
+++ b/src/soc/intel/denverton_ns/acpi/northcluster.asl
@@ -121,8 +121,6 @@ Device (PDRC)
 	Name (_UID, 1)
 
 	Name (PDRS, ResourceTemplate() {
-		// PCIEXBAR memory range
-		Memory32Fixed(ReadOnly, CONFIG_ECAM_MMCONF_BASE_ADDRESS, CONFIG_ECAM_MMCONF_LENGTH)
 		// TSEG
 		Memory32Fixed(ReadOnly, 0x00000000, 0x00000000, TSMB)
 	})
diff --git a/src/soc/intel/skylake/acpi/systemagent.asl b/src/soc/intel/skylake/acpi/systemagent.asl
index 0e5d74f297..762c4f7bf3 100644
--- a/src/soc/intel/skylake/acpi/systemagent.asl
+++ b/src/soc/intel/skylake/acpi/systemagent.asl
@@ -287,11 +287,6 @@ Device (PDRC)
 			 */
 			Memory32Fixed (ReadWrite, 0, 0x01000, EGPB)
 
-			/* PCI Express BAR _BAS and _LEN will be updated in
-			 * _CRS below according to B0:D0:F0:Reg.60h
-			 */
-			Memory32Fixed (ReadWrite, 0, 0, PCIX)
-
 			/* VTD engine memory range. */
 			Memory32Fixed (ReadOnly, VTD_BASE_ADDRESS, VTD_BASE_SIZE)
 
@@ -314,12 +309,6 @@ Device (PDRC)
 		CreateDwordField (BUF0, EGPB._BAS, EBR0)
 		EBR0 = \_SB.PCI0.GEPB ()
 
-		CreateDwordField (BUF0, PCIX._BAS, XBR0)
-		XBR0 = \_SB.PCI0.GPCB ()
-
-		CreateDwordField (BUF0, PCIX._LEN, XSZ0)
-		XSZ0 = \_SB.PCI0.GPCL ()
-
 		CreateDwordField (BUF0, FIOH._BAS, FBR0)
 		FBR0 = 0x100000000 - CONFIG_ROM_SIZE