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x86/amd_nb: Clean up early_is_amd_nb()

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The check for early_is_amd_nb() is only useful for systems with GART or
the NB_CFG register.

Zen-based systems (both AMD and Hygon) have neither, so return early for
them.

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20241206161210.163701-4-yazen.ghannam@amd.com
This commit is contained in:
Yazen Ghannam 2024-12-06 16:11:56 +00:00 committed by Borislav Petkov (AMD)
parent bee9e84060
commit e13f51b518
1 changed files with 3 additions and 4 deletions
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7
arch/x86/kernel/amd_nb.c
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@ -385,7 +385,6 @@ static int amd_cache_northbridges(void)
*/
bool __init early_is_amd_nb(u32 device)
{
const struct pci_device_id *misc_ids = amd_nb_misc_ids;
const struct pci_device_id *id;
u32 vendor = device & 0xffff;
@ -393,11 +392,11 @@ bool __init early_is_amd_nb(u32 device)
boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
return false;
if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
misc_ids = hygon_nb_misc_ids;
if (cpu_feature_enabled(X86_FEATURE_ZEN))
return false;
device >>= 16;
for (id = misc_ids; id->vendor; id++)
for (id = amd_nb_misc_ids; id->vendor; id++)
if (vendor == id->vendor && device == id->device)
return true;
return false;