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soc/amd/picasso/acpi: Remove padding in IVRS table caused by realignment. 

Previous CL (1916f8969b) misinterpreted
spec as requiring size alignment on all IVHD device entries. The correct
requirement specifies only for 4-byte entries. The unneeded realignments
result in gaps in the table. The kernel hangs in early boot due to the
malformed table.

Remove 8-byte entry alignment.

BUG=b:166519072
TEST=Boot fully to morphius board with and without amd_iommu kernel
parameter. Confirm IVRS contains no alignment gaps/corruption.

Change-Id: Iddcff98279be1d910936b13391dd2448a3bb2d74
Signed-off-by: Jason Glenesk <jason.glenesk@amd.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45050
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
This commit is contained in:
Jason Glenesk 2020-09-02 12:13:35 -07:00 committed by Aaron Durbin
parent b132bf5a87
commit ae437c575f
1 changed files with 0 additions and 8 deletions
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8
src/soc/amd/picasso/agesa_acpi.c
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@ -47,8 +47,6 @@ static uintptr_t add_agesa_acpi_table(guid_t guid, const char *name, acpi_rsdp_t
unsigned long acpi_fill_ivrs_ioapic(acpi_ivrs_t *ivrs, unsigned long current)
{
/* 8-byte IVHD structures must be aligned to the 8-byte boundary. */
current = ALIGN_UP(current, 8);
ivrs_ivhd_special_t *ivhd_ioapic = (ivrs_ivhd_special_t *)current;
memset(ivhd_ioapic, 0, sizeof(*ivhd_ioapic));
@ -75,8 +73,6 @@ unsigned long acpi_fill_ivrs_ioapic(acpi_ivrs_t *ivrs, unsigned long current)
static unsigned long ivhd_describe_hpet(unsigned long current)
{
/* 8-byte IVHD structures must be aligned to the 8-byte boundary. */
current = ALIGN_UP(current, 8);
ivrs_ivhd_special_t *ivhd_hpet = (ivrs_ivhd_special_t *)current;
ivhd_hpet->type = IVHD_DEV_8_BYTE_EXT_SPECIAL_DEV;
@ -93,8 +89,6 @@ static unsigned long ivhd_describe_hpet(unsigned long current)
static unsigned long ivhd_describe_f0_device(unsigned long current,
uint16_t dev_id, uint8_t datasetting)
{
/* 8-byte IVHD structures must be aligned to the 8-byte boundary. */
current = ALIGN_UP(current, 8);
ivrs_ivhd_f0_entry_t *ivhd_f0 = (ivrs_ivhd_f0_entry_t *) current;
ivhd_f0->type = IVHD_DEV_VARIABLE;
@ -154,8 +148,6 @@ static unsigned long add_ivhd_dev_entry(struct device *parent, struct device *de
ivhd_entry->dte_setting = data;
*current += sizeof(ivrs_ivhd_generic_t);
} else if (type == IVHD_DEV_8_BYTE_ALIAS_SELECT) {
/* 8-byte IVHD structures must be aligned to the 8-byte boundary. */
*current = ALIGN_UP(*current, 8);
ivrs_ivhd_alias_t *ivhd_entry = (ivrs_ivhd_alias_t *)*current;
ivhd_entry->type = type;