/**
* find_acpi_cpu_cache_topology() - Determine a unique cache topology value
* @cpu: Kernel logical CPU number
* @level: The cache level for which we would like a unique ID
*
* Determine a unique ID for each unified cache in the system
*
* Return: -ENOENT if the PPTT doesn't exist, or the CPU cannot be found.
* Otherwise returns a value which represents a unique topological feature.
*/
int find_acpi_cpu_cache_topology(unsigned int cpu, int level)
{
struct acpi_table_header *table;
struct acpi_pptt_cache *found_cache;
acpi_status status;
u32 acpi_cpu_id = get_acpi_id_for_cpu(cpu);
struct acpi_pptt_processor *cpu_node = NULL;
int ret = -1;
status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
if (ACPI_FAILURE(status)) {
acpi_pptt_warn_missing();
return -ENOENT;
}
found_cache = acpi_find_cache_node(table, acpi_cpu_id,
CACHE_TYPE_UNIFIED,
level,
&cpu_node);
if (found_cache)
ret = ACPI_PTR_DIFF(cpu_node, table);
acpi_put_table(table);
return ret;
}
int __init
acpi_table_parse_entries_array(char *id,
unsigned long table_size,
struct acpi_subtable_proc *proc, int proc_num,
unsigned int max_entries)
{
struct acpi_table_header *table_header = NULL;
int count;
u32 instance = 0;
if (acpi_disabled)
return -ENODEV;
if (!id)
return -EINVAL;
if (!strncmp(id, ACPI_SIG_MADT, 4))
instance = acpi_apic_instance;
acpi_get_table(id, instance, &table_header);
if (!table_header) {
pr_warn("%4.4s not present\n", id);
return -ENODEV;
}
count = acpi_parse_entries_array(id, table_size, table_header,
proc, proc_num, max_entries);
acpi_put_table(table_header);
return count;
}
phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id)
{
struct acpi_table_madt *madt = NULL;
phys_cpuid_t rv;
acpi_get_table(ACPI_SIG_MADT, 0,
(struct acpi_table_header **)&madt);
if (!madt)
return PHYS_CPUID_INVALID;
rv = map_madt_entry(madt, 1, acpi_id);
acpi_put_table((struct acpi_table_header *)madt);
return rv;
}
/**
* cache_setup_acpi() - Override CPU cache topology with data from the PPTT
* @cpu: Kernel logical CPU number
*
* Updates the global cache info provided by cpu_get_cacheinfo()
* when there are valid properties in the acpi_pptt_cache nodes. A
* successful parse may not result in any updates if none of the
* cache levels have any valid flags set. Further, a unique value is
* associated with each known CPU cache entry. This unique value
* can be used to determine whether caches are shared between CPUs.
*
* Return: -ENOENT on failure to find table, or 0 on success
*/
int cache_setup_acpi(unsigned int cpu)
{
struct acpi_table_header *table;
acpi_status status;
pr_debug("Cache Setup ACPI CPU %d\n", cpu);
status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
if (ACPI_FAILURE(status)) {
acpi_pptt_warn_missing();
return -ENOENT;
}
cache_setup_acpi_cpu(table, cpu);
acpi_put_table(table);
return status;
}
static int find_acpi_cpu_topology_tag(unsigned int cpu, int level, int flag)
{
struct acpi_table_header *table;
acpi_status status;
int retval;
status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
if (ACPI_FAILURE(status)) {
acpi_pptt_warn_missing();
return -ENOENT;
}
retval = topology_get_acpi_cpu_tag(table, cpu, level, flag);
pr_debug("Topology Setup ACPI CPU %d, level %d ret = %d\n",
cpu, level, retval);
acpi_put_table(table);
return retval;
}
/*
* The BIOS is supposed to supply a single APIC/MADT,
* but some report two. Provide a knob to use either.
* (don't you wish instance 0 and 1 were not the same?)
*/
static void __init check_multiple_madt(void)
{
struct acpi_table_header *table = NULL;
acpi_get_table(ACPI_SIG_MADT, 2, &table);
if (table) {
pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
acpi_apic_instance);
pr_warn("If \"acpi_apic_instance=%d\" works better, "
"notify [email protected]\n",
acpi_apic_instance ? 0 : 2);
acpi_put_table(table);
} else
acpi_apic_instance = 0;
return;
}
/**
* acpi_find_last_cache_level() - Determines the number of cache levels for a PE
* @cpu: Kernel logical CPU number
*
* Given a logical CPU number, returns the number of levels of cache represented
* in the PPTT. Errors caused by lack of a PPTT table, or otherwise, return 0
* indicating we didn't find any cache levels.
*
* Return: Cache levels visible to this core.
*/
int acpi_find_last_cache_level(unsigned int cpu)
{
u32 acpi_cpu_id;
struct acpi_table_header *table;
int number_of_levels = 0;
acpi_status status;
pr_debug("Cache Setup find last level CPU=%d\n", cpu);
acpi_cpu_id = get_acpi_id_for_cpu(cpu);
status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
if (ACPI_FAILURE(status)) {
acpi_pptt_warn_missing();
} else {
number_of_levels = acpi_find_cache_levels(table, acpi_cpu_id);
acpi_put_table(table);
}
pr_debug("Cache Setup find last level level=%d\n", number_of_levels);
return number_of_levels;
}
/**
* acpi_table_parse - find table with @id, run @handler on it
* @id: table id to find
* @handler: handler to run
*
* Scan the ACPI System Descriptor Table (STD) for a table matching @id,
* run @handler on it.
*
* Return 0 if table found, -errno if not.
*/
int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
{
struct acpi_table_header *table = NULL;
if (acpi_disabled)
return -ENODEV;
if (!id || !handler)
return -EINVAL;
if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
acpi_get_table(id, acpi_apic_instance, &table);
else
acpi_get_table(id, 0, &table);
if (table) {
handler(table);
acpi_put_table(table);
return 0;
} else
return -ENODEV;
}
/**
* parse_spcr() - parse ACPI SPCR table and add preferred console
*
* @earlycon: set up earlycon for the console specified by the table
*
* For the architectures with support for ACPI, CONFIG_ACPI_SPCR_TABLE may be
* defined to parse ACPI SPCR table. As a result of the parsing preferred
* console is registered and if @earlycon is true, earlycon is set up.
*
* When CONFIG_ACPI_SPCR_TABLE is defined, this function should be called
* from arch initialization code as soon as the DT/ACPI decision is made.
*
*/
int __init parse_spcr(bool earlycon)
{
static char opts[64];
struct acpi_table_spcr *table;
acpi_status status;
char *uart;
char *iotype;
int baud_rate;
int err;
if (acpi_disabled)
return -ENODEV;
status = acpi_get_table(ACPI_SIG_SPCR, 0,
(struct acpi_table_header **)&table);
if (ACPI_FAILURE(status))
return -ENOENT;
if (table->header.revision < 2) {
err = -ENOENT;
pr_err("wrong table version\n");
goto done;
}
if (table->serial_port.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
switch (table->serial_port.access_width) {
default:
pr_err("Unexpected SPCR Access Width. Defaulting to byte size\n");
case ACPI_ACCESS_SIZE_BYTE:
iotype = "mmio";
break;
case ACPI_ACCESS_SIZE_WORD:
iotype = "mmio16";
break;
case ACPI_ACCESS_SIZE_DWORD:
iotype = "mmio32";
break;
}
} else
iotype = "io";
switch (table->interface_type) {
case ACPI_DBG2_ARM_SBSA_32BIT:
iotype = "mmio32";
/* fall through */
case ACPI_DBG2_ARM_PL011:
case ACPI_DBG2_ARM_SBSA_GENERIC:
case ACPI_DBG2_BCM2835:
uart = "pl011";
break;
case ACPI_DBG2_16550_COMPATIBLE:
case ACPI_DBG2_16550_SUBSET:
uart = "uart";
break;
default:
err = -ENOENT;
goto done;
}
switch (table->baud_rate) {
case 3:
baud_rate = 9600;
break;
case 4:
baud_rate = 19200;
break;
case 6:
baud_rate = 57600;
break;
case 7:
baud_rate = 115200;
break;
default:
err = -ENOENT;
goto done;
}
if (qdf2400_erratum_44_present(&table->header))
uart = "qdf2400_e44";
if (xgene_8250_erratum_present(table))
iotype = "mmio32";
snprintf(opts, sizeof(opts), "%s,%s,0x%llx,%d", uart, iotype,
table->serial_port.address, baud_rate);
pr_info("console: %s\n", opts);
if (earlycon)
setup_earlycon(opts);
err = add_preferred_console(uart, 0, opts + strlen(uart) + 1);
done:
acpi_put_table((struct acpi_table_header *)table);
return err;
}
/**
* parse_spcr() - parse ACPI SPCR table and add preferred console
*
* @earlycon: set up earlycon for the console specified by the table
*
* For the architectures with support for ACPI, CONFIG_ACPI_SPCR_TABLE may be
* defined to parse ACPI SPCR table. As a result of the parsing preferred
* console is registered and if @earlycon is true, earlycon is set up.
*
* When CONFIG_ACPI_SPCR_TABLE is defined, this function should be called
* from arch initialization code as soon as the DT/ACPI decision is made.
*
*/
int __init parse_spcr(bool earlycon)
{
static char opts[64];
struct acpi_table_spcr *table;
acpi_status status;
char *uart;
char *iotype;
int baud_rate;
int err;
if (acpi_disabled)
return -ENODEV;
status = acpi_get_table(ACPI_SIG_SPCR, 0,
(struct acpi_table_header **)&table);
if (ACPI_FAILURE(status))
return -ENOENT;
if (table->header.revision < 2) {
err = -ENOENT;
pr_err("wrong table version\n");
goto done;
}
if (table->serial_port.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
switch (table->serial_port.access_width) {
default:
pr_err("Unexpected SPCR Access Width. Defaulting to byte size\n");
case ACPI_ACCESS_SIZE_BYTE:
iotype = "mmio";
break;
case ACPI_ACCESS_SIZE_WORD:
iotype = "mmio16";
break;
case ACPI_ACCESS_SIZE_DWORD:
iotype = "mmio32";
break;
}
} else
iotype = "io";
switch (table->interface_type) {
case ACPI_DBG2_ARM_SBSA_32BIT:
iotype = "mmio32";
/* fall through */
case ACPI_DBG2_ARM_PL011:
case ACPI_DBG2_ARM_SBSA_GENERIC:
case ACPI_DBG2_BCM2835:
uart = "pl011";
break;
case ACPI_DBG2_16550_COMPATIBLE:
case ACPI_DBG2_16550_SUBSET:
uart = "uart";
break;
default:
err = -ENOENT;
goto done;
}
switch (table->baud_rate) {
case 3:
baud_rate = 9600;
break;
case 4:
baud_rate = 19200;
break;
case 6:
baud_rate = 57600;
break;
case 7:
baud_rate = 115200;
break;
default:
err = -ENOENT;
goto done;
}
/*
* If the E44 erratum is required, then we need to tell the pl011
* driver to implement the work-around.
*
* The global variable is used by the probe function when it
* creates the UARTs, whether or not they're used as a console.
*
* If the user specifies "traditional" earlycon, the qdf2400_e44
* console name matches the EARLYCON_DECLARE() statement, and
* SPCR is not used. Parameter "earlycon" is false.
*
* If the user specifies "SPCR" earlycon, then we need to update
* the console name so that it also says "qdf2400_e44". Parameter
* "earlycon" is true.
*
* For consistency, if we change the console name, then we do it
* for everyone, not just earlycon.
*/
if (qdf2400_erratum_44_present(&table->header)) {
qdf2400_e44_present = true;
if (earlycon)
uart = "qdf2400_e44";
}
if (xgene_8250_erratum_present(table))
iotype = "mmio32";
snprintf(opts, sizeof(opts), "%s,%s,0x%llx,%d", uart, iotype,
table->serial_port.address, baud_rate);
pr_info("console: %s\n", opts);
if (earlycon)
setup_earlycon(opts);
err = add_preferred_console(uart, 0, opts + strlen(uart) + 1);
done:
acpi_put_table((struct acpi_table_header *)table);
return err;
}
