462 lines
13 KiB
C
462 lines
13 KiB
C
/*
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* Copyright (C) 2013 Imagination Technologies
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* Author: Paul Burton <paul.burton@mips.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/errno.h>
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#include <linux/percpu.h>
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#include <linux/spinlock.h>
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#include <asm/mips-cps.h>
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#include <asm/mipsregs.h>
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void __iomem *mips_gcr_base;
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void __iomem *mips_cm_l2sync_base;
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int mips_cm_is64;
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static char *cm2_tr[8] = {
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"mem", "gcr", "gic", "mmio",
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"0x04", "cpc", "0x06", "0x07"
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};
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/* CM3 Tag ECC transaction type */
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static char *cm3_tr[16] = {
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[0x0] = "ReqNoData",
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[0x1] = "0x1",
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[0x2] = "ReqWData",
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[0x3] = "0x3",
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[0x4] = "IReqNoResp",
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[0x5] = "IReqWResp",
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[0x6] = "IReqNoRespDat",
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[0x7] = "IReqWRespDat",
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[0x8] = "RespNoData",
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[0x9] = "RespDataFol",
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[0xa] = "RespWData",
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[0xb] = "RespDataOnly",
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[0xc] = "IRespNoData",
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[0xd] = "IRespDataFol",
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[0xe] = "IRespWData",
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[0xf] = "IRespDataOnly"
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};
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static char *cm2_cmd[32] = {
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[0x00] = "0x00",
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[0x01] = "Legacy Write",
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[0x02] = "Legacy Read",
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[0x03] = "0x03",
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[0x04] = "0x04",
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[0x05] = "0x05",
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[0x06] = "0x06",
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[0x07] = "0x07",
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[0x08] = "Coherent Read Own",
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[0x09] = "Coherent Read Share",
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[0x0a] = "Coherent Read Discard",
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[0x0b] = "Coherent Ready Share Always",
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[0x0c] = "Coherent Upgrade",
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[0x0d] = "Coherent Writeback",
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[0x0e] = "0x0e",
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[0x0f] = "0x0f",
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[0x10] = "Coherent Copyback",
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[0x11] = "Coherent Copyback Invalidate",
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[0x12] = "Coherent Invalidate",
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[0x13] = "Coherent Write Invalidate",
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[0x14] = "Coherent Completion Sync",
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[0x15] = "0x15",
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[0x16] = "0x16",
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[0x17] = "0x17",
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[0x18] = "0x18",
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[0x19] = "0x19",
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[0x1a] = "0x1a",
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[0x1b] = "0x1b",
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[0x1c] = "0x1c",
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[0x1d] = "0x1d",
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[0x1e] = "0x1e",
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[0x1f] = "0x1f"
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};
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/* CM3 Tag ECC command type */
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static char *cm3_cmd[16] = {
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[0x0] = "Legacy Read",
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[0x1] = "Legacy Write",
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[0x2] = "Coherent Read Own",
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[0x3] = "Coherent Read Share",
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[0x4] = "Coherent Read Discard",
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[0x5] = "Coherent Evicted",
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[0x6] = "Coherent Upgrade",
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[0x7] = "Coherent Upgrade for Store Conditional",
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[0x8] = "Coherent Writeback",
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[0x9] = "Coherent Write Invalidate",
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[0xa] = "0xa",
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[0xb] = "0xb",
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[0xc] = "0xc",
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[0xd] = "0xd",
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[0xe] = "0xe",
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[0xf] = "0xf"
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};
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/* CM3 Tag ECC command group */
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static char *cm3_cmd_group[8] = {
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[0x0] = "Normal",
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[0x1] = "Registers",
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[0x2] = "TLB",
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[0x3] = "0x3",
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[0x4] = "L1I",
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[0x5] = "L1D",
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[0x6] = "L3",
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[0x7] = "L2"
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};
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static char *cm2_core[8] = {
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"Invalid/OK", "Invalid/Data",
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"Shared/OK", "Shared/Data",
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"Modified/OK", "Modified/Data",
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"Exclusive/OK", "Exclusive/Data"
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};
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static char *cm2_causes[32] = {
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"None", "GC_WR_ERR", "GC_RD_ERR", "COH_WR_ERR",
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"COH_RD_ERR", "MMIO_WR_ERR", "MMIO_RD_ERR", "0x07",
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"0x08", "0x09", "0x0a", "0x0b",
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"0x0c", "0x0d", "0x0e", "0x0f",
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"0x10", "0x11", "0x12", "0x13",
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"0x14", "0x15", "0x16", "INTVN_WR_ERR",
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"INTVN_RD_ERR", "0x19", "0x1a", "0x1b",
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"0x1c", "0x1d", "0x1e", "0x1f"
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};
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static char *cm3_causes[32] = {
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"0x0", "MP_CORRECTABLE_ECC_ERR", "MP_REQUEST_DECODE_ERR",
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"MP_UNCORRECTABLE_ECC_ERR", "MP_PARITY_ERR", "MP_COHERENCE_ERR",
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"CMBIU_REQUEST_DECODE_ERR", "CMBIU_PARITY_ERR", "CMBIU_AXI_RESP_ERR",
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"0x9", "RBI_BUS_ERR", "0xb", "0xc", "0xd", "0xe", "0xf", "0x10",
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"0x11", "0x12", "0x13", "0x14", "0x15", "0x16", "0x17", "0x18",
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"0x19", "0x1a", "0x1b", "0x1c", "0x1d", "0x1e", "0x1f"
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};
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static DEFINE_PER_CPU_ALIGNED(spinlock_t, cm_core_lock);
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static DEFINE_PER_CPU_ALIGNED(unsigned long, cm_core_lock_flags);
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phys_addr_t __mips_cm_phys_base(void)
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{
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u32 config3 = read_c0_config3();
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unsigned long cmgcr;
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/* Check the CMGCRBase register is implemented */
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if (!(config3 & MIPS_CONF3_CMGCR))
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return 0;
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/* Read the address from CMGCRBase */
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cmgcr = read_c0_cmgcrbase();
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return (cmgcr & MIPS_CMGCRF_BASE) << (36 - 32);
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}
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phys_addr_t mips_cm_phys_base(void)
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__attribute__((weak, alias("__mips_cm_phys_base")));
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phys_addr_t __mips_cm_l2sync_phys_base(void)
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{
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u32 base_reg;
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/*
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* If the L2-only sync region is already enabled then leave it at it's
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* current location.
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*/
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base_reg = read_gcr_l2_only_sync_base();
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if (base_reg & CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN)
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return base_reg & CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE;
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/* Default to following the CM */
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return mips_cm_phys_base() + MIPS_CM_GCR_SIZE;
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}
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phys_addr_t mips_cm_l2sync_phys_base(void)
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__attribute__((weak, alias("__mips_cm_l2sync_phys_base")));
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static void mips_cm_probe_l2sync(void)
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{
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unsigned major_rev;
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phys_addr_t addr;
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/* L2-only sync was introduced with CM major revision 6 */
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major_rev = (read_gcr_rev() & CM_GCR_REV_MAJOR) >>
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__ffs(CM_GCR_REV_MAJOR);
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if (major_rev < 6)
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return;
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/* Find a location for the L2 sync region */
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addr = mips_cm_l2sync_phys_base();
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BUG_ON((addr & CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE) != addr);
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if (!addr)
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return;
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/* Set the region base address & enable it */
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write_gcr_l2_only_sync_base(addr | CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN);
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/* Map the region */
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mips_cm_l2sync_base = ioremap_nocache(addr, MIPS_CM_L2SYNC_SIZE);
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}
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int mips_cm_probe(void)
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{
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phys_addr_t addr;
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u32 base_reg;
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unsigned cpu;
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/*
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* No need to probe again if we have already been
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* here before.
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*/
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if (mips_gcr_base)
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return 0;
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addr = mips_cm_phys_base();
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BUG_ON((addr & CM_GCR_BASE_GCRBASE) != addr);
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if (!addr)
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return -ENODEV;
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mips_gcr_base = ioremap_nocache(addr, MIPS_CM_GCR_SIZE);
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if (!mips_gcr_base)
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return -ENXIO;
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/* sanity check that we're looking at a CM */
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base_reg = read_gcr_base();
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if ((base_reg & CM_GCR_BASE_GCRBASE) != addr) {
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pr_err("GCRs appear to have been moved (expected them at 0x%08lx)!\n",
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(unsigned long)addr);
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mips_gcr_base = NULL;
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return -ENODEV;
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}
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/* set default target to memory */
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change_gcr_base(CM_GCR_BASE_CMDEFTGT, CM_GCR_BASE_CMDEFTGT_MEM);
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/* disable CM regions */
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write_gcr_reg0_base(CM_GCR_REGn_BASE_BASEADDR);
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write_gcr_reg0_mask(CM_GCR_REGn_MASK_ADDRMASK);
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write_gcr_reg1_base(CM_GCR_REGn_BASE_BASEADDR);
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write_gcr_reg1_mask(CM_GCR_REGn_MASK_ADDRMASK);
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write_gcr_reg2_base(CM_GCR_REGn_BASE_BASEADDR);
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write_gcr_reg2_mask(CM_GCR_REGn_MASK_ADDRMASK);
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write_gcr_reg3_base(CM_GCR_REGn_BASE_BASEADDR);
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write_gcr_reg3_mask(CM_GCR_REGn_MASK_ADDRMASK);
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/* probe for an L2-only sync region */
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mips_cm_probe_l2sync();
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/* determine register width for this CM */
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mips_cm_is64 = IS_ENABLED(CONFIG_64BIT) && (mips_cm_revision() >= CM_REV_CM3);
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for_each_possible_cpu(cpu)
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spin_lock_init(&per_cpu(cm_core_lock, cpu));
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return 0;
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}
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void mips_cm_lock_other(unsigned int cluster, unsigned int core,
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unsigned int vp, unsigned int block)
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{
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unsigned int curr_core, cm_rev;
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u32 val;
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cm_rev = mips_cm_revision();
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preempt_disable();
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if (cm_rev >= CM_REV_CM3) {
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val = core << __ffs(CM3_GCR_Cx_OTHER_CORE);
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val |= vp << __ffs(CM3_GCR_Cx_OTHER_VP);
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if (cm_rev >= CM_REV_CM3_5) {
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val |= CM_GCR_Cx_OTHER_CLUSTER_EN;
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val |= cluster << __ffs(CM_GCR_Cx_OTHER_CLUSTER);
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val |= block << __ffs(CM_GCR_Cx_OTHER_BLOCK);
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} else {
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WARN_ON(cluster != 0);
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WARN_ON(block != CM_GCR_Cx_OTHER_BLOCK_LOCAL);
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}
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/*
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* We need to disable interrupts in SMP systems in order to
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* ensure that we don't interrupt the caller with code which
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* may modify the redirect register. We do so here in a
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* slightly obscure way by using a spin lock, since this has
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* the neat property of also catching any nested uses of
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* mips_cm_lock_other() leading to a deadlock or a nice warning
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* with lockdep enabled.
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*/
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spin_lock_irqsave(this_cpu_ptr(&cm_core_lock),
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*this_cpu_ptr(&cm_core_lock_flags));
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} else {
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WARN_ON(cluster != 0);
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WARN_ON(block != CM_GCR_Cx_OTHER_BLOCK_LOCAL);
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/*
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* We only have a GCR_CL_OTHER per core in systems with
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* CM 2.5 & older, so have to ensure other VP(E)s don't
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* race with us.
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*/
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curr_core = cpu_core(¤t_cpu_data);
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spin_lock_irqsave(&per_cpu(cm_core_lock, curr_core),
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per_cpu(cm_core_lock_flags, curr_core));
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val = core << __ffs(CM_GCR_Cx_OTHER_CORENUM);
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}
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write_gcr_cl_other(val);
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/*
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* Ensure the core-other region reflects the appropriate core &
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* VP before any accesses to it occur.
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*/
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mb();
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}
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void mips_cm_unlock_other(void)
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{
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unsigned int curr_core;
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if (mips_cm_revision() < CM_REV_CM3) {
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curr_core = cpu_core(¤t_cpu_data);
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spin_unlock_irqrestore(&per_cpu(cm_core_lock, curr_core),
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per_cpu(cm_core_lock_flags, curr_core));
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} else {
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spin_unlock_irqrestore(this_cpu_ptr(&cm_core_lock),
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*this_cpu_ptr(&cm_core_lock_flags));
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}
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preempt_enable();
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}
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void mips_cm_error_report(void)
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{
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u64 cm_error, cm_addr, cm_other;
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unsigned long revision;
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int ocause, cause;
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char buf[256];
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if (!mips_cm_present())
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return;
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revision = mips_cm_revision();
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cm_error = read_gcr_error_cause();
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cm_addr = read_gcr_error_addr();
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cm_other = read_gcr_error_mult();
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if (revision < CM_REV_CM3) { /* CM2 */
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cause = cm_error >> __ffs(CM_GCR_ERROR_CAUSE_ERRTYPE);
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ocause = cm_other >> __ffs(CM_GCR_ERROR_MULT_ERR2ND);
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if (!cause)
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return;
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if (cause < 16) {
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unsigned long cca_bits = (cm_error >> 15) & 7;
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unsigned long tr_bits = (cm_error >> 12) & 7;
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unsigned long cmd_bits = (cm_error >> 7) & 0x1f;
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unsigned long stag_bits = (cm_error >> 3) & 15;
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unsigned long sport_bits = (cm_error >> 0) & 7;
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snprintf(buf, sizeof(buf),
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"CCA=%lu TR=%s MCmd=%s STag=%lu "
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"SPort=%lu\n", cca_bits, cm2_tr[tr_bits],
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cm2_cmd[cmd_bits], stag_bits, sport_bits);
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} else {
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/* glob state & sresp together */
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unsigned long c3_bits = (cm_error >> 18) & 7;
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unsigned long c2_bits = (cm_error >> 15) & 7;
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unsigned long c1_bits = (cm_error >> 12) & 7;
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unsigned long c0_bits = (cm_error >> 9) & 7;
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unsigned long sc_bit = (cm_error >> 8) & 1;
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unsigned long cmd_bits = (cm_error >> 3) & 0x1f;
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unsigned long sport_bits = (cm_error >> 0) & 7;
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snprintf(buf, sizeof(buf),
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"C3=%s C2=%s C1=%s C0=%s SC=%s "
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"MCmd=%s SPort=%lu\n",
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cm2_core[c3_bits], cm2_core[c2_bits],
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cm2_core[c1_bits], cm2_core[c0_bits],
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sc_bit ? "True" : "False",
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cm2_cmd[cmd_bits], sport_bits);
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}
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pr_err("CM_ERROR=%08llx %s <%s>\n", cm_error,
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cm2_causes[cause], buf);
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pr_err("CM_ADDR =%08llx\n", cm_addr);
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pr_err("CM_OTHER=%08llx %s\n", cm_other, cm2_causes[ocause]);
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} else { /* CM3 */
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ulong core_id_bits, vp_id_bits, cmd_bits, cmd_group_bits;
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ulong cm3_cca_bits, mcp_bits, cm3_tr_bits, sched_bit;
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cause = cm_error >> __ffs64(CM3_GCR_ERROR_CAUSE_ERRTYPE);
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ocause = cm_other >> __ffs(CM_GCR_ERROR_MULT_ERR2ND);
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if (!cause)
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return;
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/* Used by cause == {1,2,3} */
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core_id_bits = (cm_error >> 22) & 0xf;
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vp_id_bits = (cm_error >> 18) & 0xf;
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cmd_bits = (cm_error >> 14) & 0xf;
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cmd_group_bits = (cm_error >> 11) & 0xf;
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cm3_cca_bits = (cm_error >> 8) & 7;
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mcp_bits = (cm_error >> 5) & 0xf;
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cm3_tr_bits = (cm_error >> 1) & 0xf;
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sched_bit = cm_error & 0x1;
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if (cause == 1 || cause == 3) { /* Tag ECC */
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unsigned long tag_ecc = (cm_error >> 57) & 0x1;
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unsigned long tag_way_bits = (cm_error >> 29) & 0xffff;
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unsigned long dword_bits = (cm_error >> 49) & 0xff;
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unsigned long data_way_bits = (cm_error >> 45) & 0xf;
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unsigned long data_sets_bits = (cm_error >> 29) & 0xfff;
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unsigned long bank_bit = (cm_error >> 28) & 0x1;
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snprintf(buf, sizeof(buf),
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"%s ECC Error: Way=%lu (DWORD=%lu, Sets=%lu)"
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"Bank=%lu CoreID=%lu VPID=%lu Command=%s"
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"Command Group=%s CCA=%lu MCP=%d"
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"Transaction type=%s Scheduler=%lu\n",
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tag_ecc ? "TAG" : "DATA",
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tag_ecc ? (unsigned long)ffs(tag_way_bits) - 1 :
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data_way_bits, bank_bit, dword_bits,
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data_sets_bits,
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core_id_bits, vp_id_bits,
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cm3_cmd[cmd_bits],
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cm3_cmd_group[cmd_group_bits],
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cm3_cca_bits, 1 << mcp_bits,
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cm3_tr[cm3_tr_bits], sched_bit);
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} else if (cause == 2) {
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unsigned long data_error_type = (cm_error >> 41) & 0xfff;
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unsigned long data_decode_cmd = (cm_error >> 37) & 0xf;
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unsigned long data_decode_group = (cm_error >> 34) & 0x7;
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unsigned long data_decode_destination_id = (cm_error >> 28) & 0x3f;
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snprintf(buf, sizeof(buf),
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"Decode Request Error: Type=%lu, Command=%lu"
|
|
"Command Group=%lu Destination ID=%lu"
|
|
"CoreID=%lu VPID=%lu Command=%s"
|
|
"Command Group=%s CCA=%lu MCP=%d"
|
|
"Transaction type=%s Scheduler=%lu\n",
|
|
data_error_type, data_decode_cmd,
|
|
data_decode_group, data_decode_destination_id,
|
|
core_id_bits, vp_id_bits,
|
|
cm3_cmd[cmd_bits],
|
|
cm3_cmd_group[cmd_group_bits],
|
|
cm3_cca_bits, 1 << mcp_bits,
|
|
cm3_tr[cm3_tr_bits], sched_bit);
|
|
} else {
|
|
buf[0] = 0;
|
|
}
|
|
|
|
pr_err("CM_ERROR=%llx %s <%s>\n", cm_error,
|
|
cm3_causes[cause], buf);
|
|
pr_err("CM_ADDR =%llx\n", cm_addr);
|
|
pr_err("CM_OTHER=%llx %s\n", cm_other, cm3_causes[ocause]);
|
|
}
|
|
|
|
/* reprime cause register */
|
|
write_gcr_error_cause(0);
|
|
}
|