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linuxdebug/arch/alpha/kernel/core_lca.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0
/*
* linux/arch/alpha/kernel/core_lca.c
*
* Written by David Mosberger (davidm@cs.arizona.edu) with some code
* taken from Dave Rusling's (david.rusling@reo.mts.dec.com) 32-bit
* bios code.
*
* Code common to all LCA core logic chips.
*/
#define __EXTERN_INLINE inline
#include <asm/io.h>
#include <asm/core_lca.h>
#undef __EXTERN_INLINE
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/tty.h>
#include <asm/ptrace.h>
#include <asm/irq_regs.h>
#include <asm/smp.h>
#include "proto.h"
#include "pci_impl.h"
/*
* BIOS32-style PCI interface:
*/
/*
* Machine check reasons. Defined according to PALcode sources
* (osf.h and platform.h).
*/
#define MCHK_K_TPERR 0x0080
#define MCHK_K_TCPERR 0x0082
#define MCHK_K_HERR 0x0084
#define MCHK_K_ECC_C 0x0086
#define MCHK_K_ECC_NC 0x0088
#define MCHK_K_UNKNOWN 0x008A
#define MCHK_K_CACKSOFT 0x008C
#define MCHK_K_BUGCHECK 0x008E
#define MCHK_K_OS_BUGCHECK 0x0090
#define MCHK_K_DCPERR 0x0092
#define MCHK_K_ICPERR 0x0094
/*
* Platform-specific machine-check reasons:
*/
#define MCHK_K_SIO_SERR 0x204 /* all platforms so far */
#define MCHK_K_SIO_IOCHK 0x206 /* all platforms so far */
#define MCHK_K_DCSR 0x208 /* all but Noname */
/*
* Given a bus, device, and function number, compute resulting
* configuration space address and setup the LCA_IOC_CONF register
* accordingly. It is therefore not safe to have concurrent
* invocations to configuration space access routines, but there
* really shouldn't be any need for this.
*
* Type 0:
*
* 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
* 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | | | | | | | | | | | | | | | | | | | | | | | |F|F|F|R|R|R|R|R|R|0|0|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* 31:11 Device select bit.
* 10:8 Function number
* 7:2 Register number
*
* Type 1:
*
* 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
* 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* 31:24 reserved
* 23:16 bus number (8 bits = 128 possible buses)
* 15:11 Device number (5 bits)
* 10:8 function number
* 7:2 register number
*
* Notes:
* The function number selects which function of a multi-function device
* (e.g., SCSI and Ethernet).
*
* The register selects a DWORD (32 bit) register offset. Hence it
* doesn't get shifted by 2 bits as we want to "drop" the bottom two
* bits.
*/
static int
mk_conf_addr(struct pci_bus *pbus, unsigned int device_fn, int where,
unsigned long *pci_addr)
{
unsigned long addr;
u8 bus = pbus->number;
if (bus == 0) {
int device = device_fn >> 3;
int func = device_fn & 0x7;
/* Type 0 configuration cycle. */
if (device > 12) {
return -1;
}
*(vulp)LCA_IOC_CONF = 0;
addr = (1 << (11 + device)) | (func << 8) | where;
} else {
/* Type 1 configuration cycle. */
*(vulp)LCA_IOC_CONF = 1;
addr = (bus << 16) | (device_fn << 8) | where;
}
*pci_addr = addr;
return 0;
}
static unsigned int
conf_read(unsigned long addr)
{
unsigned long flags, code, stat0;
unsigned int value;
local_irq_save(flags);
/* Reset status register to avoid losing errors. */
stat0 = *(vulp)LCA_IOC_STAT0;
*(vulp)LCA_IOC_STAT0 = stat0;
mb();
/* Access configuration space. */
value = *(vuip)addr;
draina();
stat0 = *(vulp)LCA_IOC_STAT0;
if (stat0 & LCA_IOC_STAT0_ERR) {
code = ((stat0 >> LCA_IOC_STAT0_CODE_SHIFT)
& LCA_IOC_STAT0_CODE_MASK);
if (code != 1) {
printk("lca.c:conf_read: got stat0=%lx\n", stat0);
}
/* Reset error status. */
*(vulp)LCA_IOC_STAT0 = stat0;
mb();
/* Reset machine check. */
wrmces(0x7);
value = 0xffffffff;
}
local_irq_restore(flags);
return value;
}
static void
conf_write(unsigned long addr, unsigned int value)
{
unsigned long flags, code, stat0;
local_irq_save(flags); /* avoid getting hit by machine check */
/* Reset status register to avoid losing errors. */
stat0 = *(vulp)LCA_IOC_STAT0;
*(vulp)LCA_IOC_STAT0 = stat0;
mb();
/* Access configuration space. */
*(vuip)addr = value;
draina();
stat0 = *(vulp)LCA_IOC_STAT0;
if (stat0 & LCA_IOC_STAT0_ERR) {
code = ((stat0 >> LCA_IOC_STAT0_CODE_SHIFT)
& LCA_IOC_STAT0_CODE_MASK);
if (code != 1) {
printk("lca.c:conf_write: got stat0=%lx\n", stat0);
}
/* Reset error status. */
*(vulp)LCA_IOC_STAT0 = stat0;
mb();
/* Reset machine check. */
wrmces(0x7);
}
local_irq_restore(flags);
}
static int
lca_read_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 *value)
{
unsigned long addr, pci_addr;
long mask;
int shift;
if (mk_conf_addr(bus, devfn, where, &pci_addr))
return PCIBIOS_DEVICE_NOT_FOUND;
shift = (where & 3) * 8;
mask = (size - 1) * 8;
addr = (pci_addr << 5) + mask + LCA_CONF;
*value = conf_read(addr) >> (shift);
return PCIBIOS_SUCCESSFUL;
}
static int
lca_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size,
u32 value)
{
unsigned long addr, pci_addr;
long mask;
if (mk_conf_addr(bus, devfn, where, &pci_addr))
return PCIBIOS_DEVICE_NOT_FOUND;
mask = (size - 1) * 8;
addr = (pci_addr << 5) + mask + LCA_CONF;
conf_write(addr, value << ((where & 3) * 8));
return PCIBIOS_SUCCESSFUL;
}
struct pci_ops lca_pci_ops =
{
.read = lca_read_config,
.write = lca_write_config,
};
void
lca_pci_tbi(struct pci_controller *hose, dma_addr_t start, dma_addr_t end)
{
wmb();
*(vulp)LCA_IOC_TBIA = 0;
mb();
}
void __init
lca_init_arch(void)
{
struct pci_controller *hose;
/*
* Create our single hose.
*/
pci_isa_hose = hose = alloc_pci_controller();
hose->io_space = &ioport_resource;
hose->mem_space = &iomem_resource;
hose->index = 0;
hose->sparse_mem_base = LCA_SPARSE_MEM - IDENT_ADDR;
hose->dense_mem_base = LCA_DENSE_MEM - IDENT_ADDR;
hose->sparse_io_base = LCA_IO - IDENT_ADDR;
hose->dense_io_base = 0;
/*
* Set up the PCI to main memory translation windows.
*
* Mimic the SRM settings for the direct-map window.
* Window 0 is scatter-gather 8MB at 8MB (for isa).
* Window 1 is direct access 1GB at 1GB.
*
* Note that we do not try to save any of the DMA window CSRs
* before setting them, since we cannot read those CSRs on LCA.
*/
hose->sg_isa = iommu_arena_new(hose, 0x00800000, 0x00800000,
SMP_CACHE_BYTES);
hose->sg_pci = NULL;
__direct_map_base = 0x40000000;
__direct_map_size = 0x40000000;
*(vulp)LCA_IOC_W_BASE0 = hose->sg_isa->dma_base | (3UL << 32);
*(vulp)LCA_IOC_W_MASK0 = (hose->sg_isa->size - 1) & 0xfff00000;
*(vulp)LCA_IOC_T_BASE0 = virt_to_phys(hose->sg_isa->ptes);
*(vulp)LCA_IOC_W_BASE1 = __direct_map_base | (2UL << 32);
*(vulp)LCA_IOC_W_MASK1 = (__direct_map_size - 1) & 0xfff00000;
*(vulp)LCA_IOC_T_BASE1 = 0;
*(vulp)LCA_IOC_TB_ENA = 0x80;
lca_pci_tbi(hose, 0, -1);
/*
* Disable PCI parity for now. The NCR53c810 chip has
* troubles meeting the PCI spec which results in
* data parity errors.
*/
*(vulp)LCA_IOC_PAR_DIS = 1UL<<5;
/*
* Finally, set up for restoring the correct HAE if using SRM.
* Again, since we cannot read many of the CSRs on the LCA,
* one of which happens to be the HAE, we save the value that
* the SRM will expect...
*/
if (alpha_using_srm)
srm_hae = 0x80000000UL;
}
/*
* Constants used during machine-check handling. I suppose these
* could be moved into lca.h but I don't see much reason why anybody
* else would want to use them.
*/
#define ESR_EAV (1UL<< 0) /* error address valid */
#define ESR_CEE (1UL<< 1) /* correctable error */
#define ESR_UEE (1UL<< 2) /* uncorrectable error */
#define ESR_WRE (1UL<< 3) /* write-error */
#define ESR_SOR (1UL<< 4) /* error source */
#define ESR_CTE (1UL<< 7) /* cache-tag error */
#define ESR_MSE (1UL<< 9) /* multiple soft errors */
#define ESR_MHE (1UL<<10) /* multiple hard errors */
#define ESR_NXM (1UL<<12) /* non-existent memory */
#define IOC_ERR ( 1<<4) /* ioc logs an error */
#define IOC_CMD_SHIFT 0
#define IOC_CMD (0xf<<IOC_CMD_SHIFT)
#define IOC_CODE_SHIFT 8
#define IOC_CODE (0xf<<IOC_CODE_SHIFT)
#define IOC_LOST ( 1<<5)
#define IOC_P_NBR ((__u32) ~((1<<13) - 1))
static void
mem_error(unsigned long esr, unsigned long ear)
{
printk(" %s %s error to %s occurred at address %x\n",
((esr & ESR_CEE) ? "Correctable" :
(esr & ESR_UEE) ? "Uncorrectable" : "A"),
(esr & ESR_WRE) ? "write" : "read",
(esr & ESR_SOR) ? "memory" : "b-cache",
(unsigned) (ear & 0x1ffffff8));
if (esr & ESR_CTE) {
printk(" A b-cache tag parity error was detected.\n");
}
if (esr & ESR_MSE) {
printk(" Several other correctable errors occurred.\n");
}
if (esr & ESR_MHE) {
printk(" Several other uncorrectable errors occurred.\n");
}
if (esr & ESR_NXM) {
printk(" Attempted to access non-existent memory.\n");
}
}
static void
ioc_error(__u32 stat0, __u32 stat1)
{
static const char * const pci_cmd[] = {
"Interrupt Acknowledge", "Special", "I/O Read", "I/O Write",
"Rsvd 1", "Rsvd 2", "Memory Read", "Memory Write", "Rsvd3",
"Rsvd4", "Configuration Read", "Configuration Write",
"Memory Read Multiple", "Dual Address", "Memory Read Line",
"Memory Write and Invalidate"
};
static const char * const err_name[] = {
"exceeded retry limit", "no device", "bad data parity",
"target abort", "bad address parity", "page table read error",
"invalid page", "data error"
};
unsigned code = (stat0 & IOC_CODE) >> IOC_CODE_SHIFT;
unsigned cmd = (stat0 & IOC_CMD) >> IOC_CMD_SHIFT;
printk(" %s initiated PCI %s cycle to address %x"
" failed due to %s.\n",
code > 3 ? "PCI" : "CPU", pci_cmd[cmd], stat1, err_name[code]);
if (code == 5 || code == 6) {
printk(" (Error occurred at PCI memory address %x.)\n",
(stat0 & ~IOC_P_NBR));
}
if (stat0 & IOC_LOST) {
printk(" Other PCI errors occurred simultaneously.\n");
}
}
void
lca_machine_check(unsigned long vector, unsigned long la_ptr)
{
const char * reason;
union el_lca el;
el.c = (struct el_common *) la_ptr;
wrmces(rdmces()); /* reset machine check pending flag */
printk(KERN_CRIT "LCA machine check: vector=%#lx pc=%#lx code=%#x\n",
vector, get_irq_regs()->pc, (unsigned int) el.c->code);
/*
* The first quadword after the common header always seems to
* be the machine check reason---don't know why this isn't
* part of the common header instead. In the case of a long
* logout frame, the upper 32 bits is the machine check
* revision level, which we ignore for now.
*/
switch ((unsigned int) el.c->code) {
case MCHK_K_TPERR: reason = "tag parity error"; break;
case MCHK_K_TCPERR: reason = "tag control parity error"; break;
case MCHK_K_HERR: reason = "access to non-existent memory"; break;
case MCHK_K_ECC_C: reason = "correctable ECC error"; break;
case MCHK_K_ECC_NC: reason = "non-correctable ECC error"; break;
case MCHK_K_CACKSOFT: reason = "MCHK_K_CACKSOFT"; break;
case MCHK_K_BUGCHECK: reason = "illegal exception in PAL mode"; break;
case MCHK_K_OS_BUGCHECK: reason = "callsys in kernel mode"; break;
case MCHK_K_DCPERR: reason = "d-cache parity error"; break;
case MCHK_K_ICPERR: reason = "i-cache parity error"; break;
case MCHK_K_SIO_SERR: reason = "SIO SERR occurred on PCI bus"; break;
case MCHK_K_SIO_IOCHK: reason = "SIO IOCHK occurred on ISA bus"; break;
case MCHK_K_DCSR: reason = "MCHK_K_DCSR"; break;
case MCHK_K_UNKNOWN:
default: reason = "unknown"; break;
}
switch (el.c->size) {
case sizeof(struct el_lca_mcheck_short):
printk(KERN_CRIT
" Reason: %s (short frame%s, dc_stat=%#lx):\n",
reason, el.c->retry ? ", retryable" : "",
el.s->dc_stat);
if (el.s->esr & ESR_EAV) {
mem_error(el.s->esr, el.s->ear);
}
if (el.s->ioc_stat0 & IOC_ERR) {
ioc_error(el.s->ioc_stat0, el.s->ioc_stat1);
}
break;
case sizeof(struct el_lca_mcheck_long):
printk(KERN_CRIT " Reason: %s (long frame%s):\n",
reason, el.c->retry ? ", retryable" : "");
printk(KERN_CRIT
" reason: %#lx exc_addr: %#lx dc_stat: %#lx\n",
el.l->pt[0], el.l->exc_addr, el.l->dc_stat);
printk(KERN_CRIT " car: %#lx\n", el.l->car);
if (el.l->esr & ESR_EAV) {
mem_error(el.l->esr, el.l->ear);
}
if (el.l->ioc_stat0 & IOC_ERR) {
ioc_error(el.l->ioc_stat0, el.l->ioc_stat1);
}
break;
default:
printk(KERN_CRIT " Unknown errorlog size %d\n", el.c->size);
}
/* Dump the logout area to give all info. */
#ifdef CONFIG_VERBOSE_MCHECK
if (alpha_verbose_mcheck > 1) {
unsigned long * ptr = (unsigned long *) la_ptr;
long i;
for (i = 0; i < el.c->size / sizeof(long); i += 2) {
printk(KERN_CRIT " +%8lx %016lx %016lx\n",
i*sizeof(long), ptr[i], ptr[i+1]);
}
}
#endif /* CONFIG_VERBOSE_MCHECK */
}
/*
* The following routines are needed to support the SPEED changing
* necessary to successfully manage the thermal problem on the AlphaBook1.
*/
void
lca_clock_print(void)
{
long pmr_reg;
pmr_reg = LCA_READ_PMR;
printk("Status of clock control:\n");
printk("\tPrimary clock divisor\t0x%lx\n", LCA_GET_PRIMARY(pmr_reg));
printk("\tOverride clock divisor\t0x%lx\n", LCA_GET_OVERRIDE(pmr_reg));
printk("\tInterrupt override is %s\n",
(pmr_reg & LCA_PMR_INTO) ? "on" : "off");
printk("\tDMA override is %s\n",
(pmr_reg & LCA_PMR_DMAO) ? "on" : "off");
}
int
lca_get_clock(void)
{
long pmr_reg;
pmr_reg = LCA_READ_PMR;
return(LCA_GET_PRIMARY(pmr_reg));
}
void
lca_clock_fiddle(int divisor)
{
long pmr_reg;
pmr_reg = LCA_READ_PMR;
LCA_SET_PRIMARY_CLOCK(pmr_reg, divisor);
/* lca_norm_clock = divisor; */
LCA_WRITE_PMR(pmr_reg);
mb();
}