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linux-stable/arch/mips/kernel/mips-cm.c
Paul Burton b025d51873 MIPS: CM: Specify register size when generating accessors 
Some CM registers are always 32 bits, or at least only use bits in the
lower 32 bits of the register. For these registers it is wasteful for us
to generate accessors which bother to check mips_cm_is64 & perform 64
bit accesses.

This patch modifies the accessor generation to take into account the
size of the register, and for 32 bit registers we generate accessors
which only ever perform 32 bit accesses. For 64 bit registers we either
perform a 64 bit access or two 32 bit accesses, depending upon the value
of mips_cm_is64. Doing this saves us ~1.5KiB of code in a generic 64r6el
kernel, and perhaps more importantly simplifies various code paths.

This removes the read64_gcr_* accessors, so mips_cm_error_report() is
modified to stop using them & instead use the regular read_gcr_*
accessors which will return 64 bit values from the 64 bit registers.

The new accessor macros are placed in asm/mips-cps.h such that they can
be shared by CPC & GIC code in later patches.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17000/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2017-08-29 15:21:57 +02:00

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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_gcr_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 transaction 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_gcr_base)
return 0;
addr = mips_cm_phys_base();
BUG_ON((addr & CM_GCR_BASE_GCRBASE_MSK) != addr);
if (!addr)
return -ENODEV;
mips_gcr_base = ioremap_nocache(addr, MIPS_CM_GCR_SIZE);
if (!mips_gcr_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_gcr_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 = IS_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();
if (mips_cm_revision() >= CM_REV_CM3) {
val = core << CM3_GCR_Cx_OTHER_CORE_SHF;
val |= vp << CM3_GCR_Cx_OTHER_VP_SHF;
/*
* We need to disable interrupts in SMP systems in order to
* ensure that we don't interrupt the caller with code which
* may modify the redirect register. We do so here in a
* slightly obscure way by using a spin lock, since this has
* the neat property of also catching any nested uses of
* mips_cm_lock_other() leading to a deadlock or a nice warning
* with lockdep enabled.
*/
spin_lock_irqsave(this_cpu_ptr(&cm_core_lock),
*this_cpu_ptr(&cm_core_lock_flags));
} else {
WARN_ON(vp != 0);
/*
* We only have a GCR_CL_OTHER per core in systems with
* CM 2.5 & older, so have to ensure other VP(E)s don't
* race with us.
*/
curr_core = current_cpu_data.core;
spin_lock_irqsave(&per_cpu(cm_core_lock, curr_core),
per_cpu(cm_core_lock_flags, curr_core));
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 int curr_core;
if (mips_cm_revision() < CM_REV_CM3) {
curr_core = current_cpu_data.core;
spin_unlock_irqrestore(&per_cpu(cm_core_lock, curr_core),
per_cpu(cm_core_lock_flags, curr_core));
} else {
spin_unlock_irqrestore(this_cpu_ptr(&cm_core_lock),
*this_cpu_ptr(&cm_core_lock_flags));
}
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();
cm_error = read_gcr_error_cause();
cm_addr = read_gcr_error_addr();
cm_other = read_gcr_error_mult();
if (revision < CM_REV_CM3) { /* CM2 */
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;
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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