From 33649bf4494c1feaf1956a84895fcc0621aafd90 Mon Sep 17 00:00:00 2001 From: Steve Wahl Date: Wed, 13 May 2020 17:11:23 -0500 Subject: [PATCH] x86/apic/uv: Remove code for unused distributed GRU mode Distributed GRU mode appeared in only one generation of UV hardware, and no version of the BIOS has shipped with this feature enabled, and we have no plans to ever change that. The gru.s3.mode check has always been and will continue to be false. So remove this dead code. Signed-off-by: Steve Wahl Signed-off-by: Borislav Petkov Acked-by: Dimitri Sivanich Link: https://lkml.kernel.org/r/20200513221123.GJ3240@raspberrypi --- arch/x86/kernel/apic/x2apic_uv_x.c | 59 +----------------------------- 1 file changed, 1 insertion(+), 58 deletions(-) diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c index 10339ad02033..69e70ed0f5e6 100644 --- a/arch/x86/kernel/apic/x2apic_uv_x.c +++ b/arch/x86/kernel/apic/x2apic_uv_x.c @@ -30,8 +30,6 @@ static enum uv_system_type uv_system_type; static int uv_hubbed_system; static int uv_hubless_system; static u64 gru_start_paddr, gru_end_paddr; -static u64 gru_dist_base, gru_first_node_paddr = -1LL, gru_last_node_paddr; -static u64 gru_dist_lmask, gru_dist_umask; static union uvh_apicid uvh_apicid; /* Unpack OEM/TABLE ID's to be NULL terminated strings */ @@ -83,20 +81,7 @@ static unsigned long __init uv_early_read_mmr(unsigned long addr) static inline bool is_GRU_range(u64 start, u64 end) { - if (gru_dist_base) { - u64 su = start & gru_dist_umask; /* Upper (incl pnode) bits */ - u64 sl = start & gru_dist_lmask; /* Base offset bits */ - u64 eu = end & gru_dist_umask; - u64 el = end & gru_dist_lmask; - - /* Must reside completely within a single GRU range: */ - return (sl == gru_dist_base && el == gru_dist_base && - su >= gru_first_node_paddr && - su <= gru_last_node_paddr && - eu == su); - } else { - return start >= gru_start_paddr && end <= gru_end_paddr; - } + return start >= gru_start_paddr && end <= gru_end_paddr; } static bool uv_is_untracked_pat_range(u64 start, u64 end) @@ -797,42 +782,6 @@ static __init void map_high(char *id, unsigned long base, int pshift, int bshift init_extra_mapping_wb(paddr, bytes); } -static __init void map_gru_distributed(unsigned long c) -{ - union uvh_rh_gam_gru_overlay_config_mmr_u gru; - u64 paddr; - unsigned long bytes; - int nid; - - gru.v = c; - - /* Only base bits 42:28 relevant in dist mode */ - gru_dist_base = gru.v & 0x000007fff0000000UL; - if (!gru_dist_base) { - pr_info("UV: Map GRU_DIST base address NULL\n"); - return; - } - - bytes = 1UL << UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR_BASE_SHFT; - gru_dist_lmask = ((1UL << uv_hub_info->m_val) - 1) & ~(bytes - 1); - gru_dist_umask = ~((1UL << uv_hub_info->m_val) - 1); - gru_dist_base &= gru_dist_lmask; /* Clear bits above M */ - - for_each_online_node(nid) { - paddr = ((u64)uv_node_to_pnode(nid) << uv_hub_info->m_val) | - gru_dist_base; - init_extra_mapping_wb(paddr, bytes); - gru_first_node_paddr = min(paddr, gru_first_node_paddr); - gru_last_node_paddr = max(paddr, gru_last_node_paddr); - } - - /* Save upper (63:M) bits of address only for is_GRU_range */ - gru_first_node_paddr &= gru_dist_umask; - gru_last_node_paddr &= gru_dist_umask; - - pr_debug("UV: Map GRU_DIST base 0x%016llx 0x%016llx - 0x%016llx\n", gru_dist_base, gru_first_node_paddr, gru_last_node_paddr); -} - static __init void map_gru_high(int max_pnode) { union uvh_rh_gam_gru_overlay_config_mmr_u gru; @@ -846,12 +795,6 @@ static __init void map_gru_high(int max_pnode) return; } - /* Only UV3 has distributed GRU mode */ - if (is_uv3_hub() && gru.s3.mode) { - map_gru_distributed(gru.v); - return; - } - base = (gru.v & mask) >> shift; map_high("GRU", base, shift, shift, max_pnode, map_wb); gru_start_paddr = ((u64)base << shift); -- 2.39.5