From 96a80133e17c238d9f1566ea2cdc545445920968 Mon Sep 17 00:00:00 2001 From: Angel Pons Date: Mon, 3 Aug 2020 12:29:41 +0200 Subject: soc/intel/skylake: Add RMRRs after all DRHDs The VT-d architecture specification (Doc. D51397-011, Rev. 3.1) says: BIOS implementations must report these remapping structure types in numerical order. i.e., All remapping structures of type 0 (DRHD) enumerated before remapping structures of type 1 (RMRR), and so forth. So, update the corresponding code to adhere to the specification. Change-Id: I2446d536603559f637f3f8b1b44e9d712aa35492 Signed-off-by: Angel Pons Reviewed-on: https://review.coreboot.org/c/coreboot/+/44112 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Rudolph --- src/soc/intel/skylake/acpi.c | 29 ++++++++++++++++++----------- 1 file changed, 18 insertions(+), 11 deletions(-) (limited to 'src/soc/intel/skylake') diff --git a/src/soc/intel/skylake/acpi.c b/src/soc/intel/skylake/acpi.c index 1beff3d3af..ae9d78436c 100644 --- a/src/soc/intel/skylake/acpi.c +++ b/src/soc/intel/skylake/acpi.c @@ -425,22 +425,19 @@ static unsigned long acpi_fill_dmar(unsigned long current) const bool gfxvten = MCHBAR32(GFXVTBAR) & 1; /* iGFX has to be enabled, GFXVTBAR set and in 32-bit space. */ - if (igfx_dev && igfx_dev->enabled && gfxvten && - gfx_vtbar && !MCHBAR32(GFXVTBAR + 4)) { - unsigned long tmp = current; + const bool emit_igd = + igfx_dev && igfx_dev->enabled && + gfx_vtbar && gfxvten && + !MCHBAR32(GFXVTBAR + 4); + + /* First, add DRHD entries */ + if (emit_igd) { + const unsigned long tmp = current; current += acpi_create_dmar_drhd(current, 0, 0, gfx_vtbar); current += acpi_create_dmar_ds_pci(current, 0, 2, 0); acpi_dmar_drhd_fixup(tmp, current); - - /* Add RMRR entry */ - tmp = current; - - current += acpi_create_dmar_rmrr(current, 0, - sa_get_gsm_base(), sa_get_tolud_base() - 1); - current += acpi_create_dmar_ds_pci(current, 0, 2, 0); - acpi_dmar_rmrr_fixup(tmp, current); } const u32 vtvc0bar = MCHBAR32(VTVC0BAR) & ~0xfff; @@ -461,6 +458,16 @@ static unsigned long acpi_fill_dmar(unsigned long current) acpi_dmar_drhd_fixup(tmp, current); } + /* Then, add RMRR entries after all DRHD entries */ + if (emit_igd) { + const unsigned long tmp = current; + + current += acpi_create_dmar_rmrr(current, 0, + sa_get_gsm_base(), sa_get_tolud_base() - 1); + current += acpi_create_dmar_ds_pci(current, 0, 2, 0); + acpi_dmar_rmrr_fixup(tmp, current); + } + return current; } -- cgit v1.2.3