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linux/arch/mips/kernel/mips-cm.c
Paul Burton 78a54c4d8e MIPS: CM, CPC: Ensure core-other GCRs reflect the correct core 
Ensure the update to which core the core-other GCR regions reflect has
taken place before any core-other GCRs are accessed by placing a memory
barrier (sync instruction) between the write to the core-other registers
and any such GCR accesses.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-kernel@vger.kernel.org
Cc: Markos Chandras <markos.chandras@imgtec.com>
Patchwork: https://patchwork.linux-mips.org/patch/11209/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-11-11 08:35:18 +01:00

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/*
* Copyright (C) 2013 Imagination Technologies
* Author: Paul Burton <paul.burton@imgtec.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/errno.h>
#include <linux/percpu.h>
#include <linux/spinlock.h>
#include <asm/mips-cm.h>
#include <asm/mipsregs.h>
void __iomem *mips_cm_base;
void __iomem *mips_cm_l2sync_base;
int mips_cm_is64;
static char *cm2_tr[8] = {
"mem", "gcr", "gic", "mmio",
"0x04", "cpc", "0x06", "0x07"
};
/* CM3 Tag ECC transation type */
static char *cm3_tr[16] = {
[0x0] = "ReqNoData",
[0x1] = "0x1",
[0x2] = "ReqWData",
[0x3] = "0x3",
[0x4] = "IReqNoResp",
[0x5] = "IReqWResp",
[0x6] = "IReqNoRespDat",
[0x7] = "IReqWRespDat",
[0x8] = "RespNoData",
[0x9] = "RespDataFol",
[0xa] = "RespWData",
[0xb] = "RespDataOnly",
[0xc] = "IRespNoData",
[0xd] = "IRespDataFol",
[0xe] = "IRespWData",
[0xf] = "IRespDataOnly"
};
static char *cm2_cmd[32] = {
[0x00] = "0x00",
[0x01] = "Legacy Write",
[0x02] = "Legacy Read",
[0x03] = "0x03",
[0x04] = "0x04",
[0x05] = "0x05",
[0x06] = "0x06",
[0x07] = "0x07",
[0x08] = "Coherent Read Own",
[0x09] = "Coherent Read Share",
[0x0a] = "Coherent Read Discard",
[0x0b] = "Coherent Ready Share Always",
[0x0c] = "Coherent Upgrade",
[0x0d] = "Coherent Writeback",
[0x0e] = "0x0e",
[0x0f] = "0x0f",
[0x10] = "Coherent Copyback",
[0x11] = "Coherent Copyback Invalidate",
[0x12] = "Coherent Invalidate",
[0x13] = "Coherent Write Invalidate",
[0x14] = "Coherent Completion Sync",
[0x15] = "0x15",
[0x16] = "0x16",
[0x17] = "0x17",
[0x18] = "0x18",
[0x19] = "0x19",
[0x1a] = "0x1a",
[0x1b] = "0x1b",
[0x1c] = "0x1c",
[0x1d] = "0x1d",
[0x1e] = "0x1e",
[0x1f] = "0x1f"
};
/* CM3 Tag ECC command type */
static char *cm3_cmd[16] = {
[0x0] = "Legacy Read",
[0x1] = "Legacy Write",
[0x2] = "Coherent Read Own",
[0x3] = "Coherent Read Share",
[0x4] = "Coherent Read Discard",
[0x5] = "Coherent Evicted",
[0x6] = "Coherent Upgrade",
[0x7] = "Coherent Upgrade for Store Conditional",
[0x8] = "Coherent Writeback",
[0x9] = "Coherent Write Invalidate",
[0xa] = "0xa",
[0xb] = "0xb",
[0xc] = "0xc",
[0xd] = "0xd",
[0xe] = "0xe",
[0xf] = "0xf"
};
/* CM3 Tag ECC command group */
static char *cm3_cmd_group[8] = {
[0x0] = "Normal",
[0x1] = "Registers",
[0x2] = "TLB",
[0x3] = "0x3",
[0x4] = "L1I",
[0x5] = "L1D",
[0x6] = "L3",
[0x7] = "L2"
};
static char *cm2_core[8] = {
"Invalid/OK", "Invalid/Data",
"Shared/OK", "Shared/Data",
"Modified/OK", "Modified/Data",
"Exclusive/OK", "Exclusive/Data"
};
static char *cm2_causes[32] = {
"None", "GC_WR_ERR", "GC_RD_ERR", "COH_WR_ERR",
"COH_RD_ERR", "MMIO_WR_ERR", "MMIO_RD_ERR", "0x07",
"0x08", "0x09", "0x0a", "0x0b",
"0x0c", "0x0d", "0x0e", "0x0f",
"0x10", "0x11", "0x12", "0x13",
"0x14", "0x15", "0x16", "INTVN_WR_ERR",
"INTVN_RD_ERR", "0x19", "0x1a", "0x1b",
"0x1c", "0x1d", "0x1e", "0x1f"
};
static char *cm3_causes[32] = {
"0x0", "MP_CORRECTABLE_ECC_ERR", "MP_REQUEST_DECODE_ERR",
"MP_UNCORRECTABLE_ECC_ERR", "MP_PARITY_ERR", "MP_COHERENCE_ERR",
"CMBIU_REQUEST_DECODE_ERR", "CMBIU_PARITY_ERR", "CMBIU_AXI_RESP_ERR",
"0x9", "RBI_BUS_ERR", "0xb", "0xc", "0xd", "0xe", "0xf", "0x10",
"0x11", "0x12", "0x13", "0x14", "0x15", "0x16", "0x17", "0x18",
"0x19", "0x1a", "0x1b", "0x1c", "0x1d", "0x1e", "0x1f"
};
static DEFINE_PER_CPU_ALIGNED(spinlock_t, cm_core_lock);
static DEFINE_PER_CPU_ALIGNED(unsigned long, cm_core_lock_flags);
phys_addr_t __mips_cm_phys_base(void)
{
u32 config3 = read_c0_config3();
unsigned long cmgcr;
/* Check the CMGCRBase register is implemented */
if (!(config3 & MIPS_CONF3_CMGCR))
return 0;
/* Read the address from CMGCRBase */
cmgcr = read_c0_cmgcrbase();
return (cmgcr & MIPS_CMGCRF_BASE) << (36 - 32);
}
phys_addr_t mips_cm_phys_base(void)
__attribute__((weak, alias("__mips_cm_phys_base")));
phys_addr_t __mips_cm_l2sync_phys_base(void)
{
u32 base_reg;
/*
* If the L2-only sync region is already enabled then leave it at it's
* current location.
*/
base_reg = read_gcr_l2_only_sync_base();
if (base_reg & CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN_MSK)
return base_reg & CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE_MSK;
/* Default to following the CM */
return mips_cm_phys_base() + MIPS_CM_GCR_SIZE;
}
phys_addr_t mips_cm_l2sync_phys_base(void)
__attribute__((weak, alias("__mips_cm_l2sync_phys_base")));
static void mips_cm_probe_l2sync(void)
{
unsigned major_rev;
phys_addr_t addr;
/* L2-only sync was introduced with CM major revision 6 */
major_rev = (read_gcr_rev() & CM_GCR_REV_MAJOR_MSK) >>
CM_GCR_REV_MAJOR_SHF;
if (major_rev < 6)
return;
/* Find a location for the L2 sync region */
addr = mips_cm_l2sync_phys_base();
BUG_ON((addr & CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE_MSK) != addr);
if (!addr)
return;
/* Set the region base address & enable it */
write_gcr_l2_only_sync_base(addr | CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN_MSK);
/* Map the region */
mips_cm_l2sync_base = ioremap_nocache(addr, MIPS_CM_L2SYNC_SIZE);
}
int mips_cm_probe(void)
{
phys_addr_t addr;
u32 base_reg;
unsigned cpu;
/*
* No need to probe again if we have already been
* here before.
*/
if (mips_cm_base)
return 0;
addr = mips_cm_phys_base();
BUG_ON((addr & CM_GCR_BASE_GCRBASE_MSK) != addr);
if (!addr)
return -ENODEV;
mips_cm_base = ioremap_nocache(addr, MIPS_CM_GCR_SIZE);
if (!mips_cm_base)
return -ENXIO;
/* sanity check that we're looking at a CM */
base_reg = read_gcr_base();
if ((base_reg & CM_GCR_BASE_GCRBASE_MSK) != addr) {
pr_err("GCRs appear to have been moved (expected them at 0x%08lx)!\n",
(unsigned long)addr);
mips_cm_base = NULL;
return -ENODEV;
}
/* set default target to memory */
base_reg &= ~CM_GCR_BASE_CMDEFTGT_MSK;
base_reg |= CM_GCR_BASE_CMDEFTGT_MEM;
write_gcr_base(base_reg);
/* disable CM regions */
write_gcr_reg0_base(CM_GCR_REGn_BASE_BASEADDR_MSK);
write_gcr_reg0_mask(CM_GCR_REGn_MASK_ADDRMASK_MSK);
write_gcr_reg1_base(CM_GCR_REGn_BASE_BASEADDR_MSK);
write_gcr_reg1_mask(CM_GCR_REGn_MASK_ADDRMASK_MSK);
write_gcr_reg2_base(CM_GCR_REGn_BASE_BASEADDR_MSK);
write_gcr_reg2_mask(CM_GCR_REGn_MASK_ADDRMASK_MSK);
write_gcr_reg3_base(CM_GCR_REGn_BASE_BASEADDR_MSK);
write_gcr_reg3_mask(CM_GCR_REGn_MASK_ADDRMASK_MSK);
/* probe for an L2-only sync region */
mips_cm_probe_l2sync();
/* determine register width for this CM */
mips_cm_is64 = config_enabled(CONFIG_64BIT) && (mips_cm_revision() >= CM_REV_CM3);
for_each_possible_cpu(cpu)
spin_lock_init(&per_cpu(cm_core_lock, cpu));
return 0;
}
void mips_cm_lock_other(unsigned int core, unsigned int vp)
{
unsigned curr_core;
u32 val;
preempt_disable();
curr_core = current_cpu_data.core;
spin_lock_irqsave(&per_cpu(cm_core_lock, curr_core),
per_cpu(cm_core_lock_flags, curr_core));
if (mips_cm_revision() >= CM_REV_CM3) {
val = core << CM3_GCR_Cx_OTHER_CORE_SHF;
val |= vp << CM3_GCR_Cx_OTHER_VP_SHF;
} else {
BUG_ON(vp != 0);
val = core << CM_GCR_Cx_OTHER_CORENUM_SHF;
}
write_gcr_cl_other(val);
/*
* Ensure the core-other region reflects the appropriate core &
* VP before any accesses to it occur.
*/
mb();
}
void mips_cm_unlock_other(void)
{
unsigned curr_core = current_cpu_data.core;
spin_unlock_irqrestore(&per_cpu(cm_core_lock, curr_core),
per_cpu(cm_core_lock_flags, curr_core));
preempt_enable();
}
void mips_cm_error_report(void)
{
u64 cm_error, cm_addr, cm_other;
unsigned long revision;
int ocause, cause;
char buf[256];
if (!mips_cm_present())
return;
revision = mips_cm_revision();
if (revision < CM_REV_CM3) { /* CM2 */
cm_error = read_gcr_error_cause();
cm_addr = read_gcr_error_addr();
cm_other = read_gcr_error_mult();
cause = cm_error >> CM_GCR_ERROR_CAUSE_ERRTYPE_SHF;
ocause = cm_other >> CM_GCR_ERROR_MULT_ERR2ND_SHF;
if (!cause)
return;
if (cause < 16) {
unsigned long cca_bits = (cm_error >> 15) & 7;
unsigned long tr_bits = (cm_error >> 12) & 7;
unsigned long cmd_bits = (cm_error >> 7) & 0x1f;
unsigned long stag_bits = (cm_error >> 3) & 15;
unsigned long sport_bits = (cm_error >> 0) & 7;
snprintf(buf, sizeof(buf),
"CCA=%lu TR=%s MCmd=%s STag=%lu "
"SPort=%lu\n", cca_bits, cm2_tr[tr_bits],
cm2_cmd[cmd_bits], stag_bits, sport_bits);
} else {
/* glob state & sresp together */
unsigned long c3_bits = (cm_error >> 18) & 7;
unsigned long c2_bits = (cm_error >> 15) & 7;
unsigned long c1_bits = (cm_error >> 12) & 7;
unsigned long c0_bits = (cm_error >> 9) & 7;
unsigned long sc_bit = (cm_error >> 8) & 1;
unsigned long cmd_bits = (cm_error >> 3) & 0x1f;
unsigned long sport_bits = (cm_error >> 0) & 7;
snprintf(buf, sizeof(buf),
"C3=%s C2=%s C1=%s C0=%s SC=%s "
"MCmd=%s SPort=%lu\n",
cm2_core[c3_bits], cm2_core[c2_bits],
cm2_core[c1_bits], cm2_core[c0_bits],
sc_bit ? "True" : "False",
cm2_cmd[cmd_bits], sport_bits);
}
pr_err("CM_ERROR=%08llx %s <%s>\n", cm_error,
cm2_causes[cause], buf);
pr_err("CM_ADDR =%08llx\n", cm_addr);
pr_err("CM_OTHER=%08llx %s\n", cm_other, cm2_causes[ocause]);
} else { /* CM3 */
ulong core_id_bits, vp_id_bits, cmd_bits, cmd_group_bits;
ulong cm3_cca_bits, mcp_bits, cm3_tr_bits, sched_bit;
cm_error = read64_gcr_error_cause();
cm_addr = read64_gcr_error_addr();
cm_other = read64_gcr_error_mult();
cause = cm_error >> CM3_GCR_ERROR_CAUSE_ERRTYPE_SHF;
ocause = cm_other >> CM_GCR_ERROR_MULT_ERR2ND_SHF;
if (!cause)
return;
/* Used by cause == {1,2,3} */
core_id_bits = (cm_error >> 22) & 0xf;
vp_id_bits = (cm_error >> 18) & 0xf;
cmd_bits = (cm_error >> 14) & 0xf;
cmd_group_bits = (cm_error >> 11) & 0xf;
cm3_cca_bits = (cm_error >> 8) & 7;
mcp_bits = (cm_error >> 5) & 0xf;
cm3_tr_bits = (cm_error >> 1) & 0xf;
sched_bit = cm_error & 0x1;
if (cause == 1 || cause == 3) { /* Tag ECC */
unsigned long tag_ecc = (cm_error >> 57) & 0x1;
unsigned long tag_way_bits = (cm_error >> 29) & 0xffff;
unsigned long dword_bits = (cm_error >> 49) & 0xff;
unsigned long data_way_bits = (cm_error >> 45) & 0xf;
unsigned long data_sets_bits = (cm_error >> 29) & 0xfff;
unsigned long bank_bit = (cm_error >> 28) & 0x1;
snprintf(buf, sizeof(buf),
"%s ECC Error: Way=%lu (DWORD=%lu, Sets=%lu)"
"Bank=%lu CoreID=%lu VPID=%lu Command=%s"
"Command Group=%s CCA=%lu MCP=%d"
"Transaction type=%s Scheduler=%lu\n",
tag_ecc ? "TAG" : "DATA",
tag_ecc ? (unsigned long)ffs(tag_way_bits) - 1 :
data_way_bits, bank_bit, dword_bits,
data_sets_bits,
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 if (cause == 2) {
unsigned long data_error_type = (cm_error >> 41) & 0xfff;
unsigned long data_decode_cmd = (cm_error >> 37) & 0xf;
unsigned long data_decode_group = (cm_error >> 34) & 0x7;
unsigned long data_decode_destination_id = (cm_error >> 28) & 0x3f;
snprintf(buf, sizeof(buf),
"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);
}
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