/**
* acpi_cppc_processor_probe - Search for per CPU _CPC objects.
* @pr: Ptr to acpi_processor containing this CPUs logical Id.
*
* Return: 0 for success or negative value for err.
*/
int acpi_cppc_processor_probe(struct acpi_processor *pr)
{
struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
union acpi_object *out_obj, *cpc_obj;
struct cpc_desc *cpc_ptr;
struct cpc_reg *gas_t;
acpi_handle handle = pr->handle;
unsigned int num_ent, i, cpc_rev;
acpi_status status;
int ret = -EFAULT;
/* Parse the ACPI _CPC table for this cpu. */
status = acpi_evaluate_object_typed(handle, "_CPC", NULL, &output,
ACPI_TYPE_PACKAGE);
if (ACPI_FAILURE(status)) {
ret = -ENODEV;
goto out_buf_free;
}
out_obj = (union acpi_object *) output.pointer;
cpc_ptr = kzalloc(sizeof(struct cpc_desc), GFP_KERNEL);
if (!cpc_ptr) {
ret = -ENOMEM;
goto out_buf_free;
}
/* First entry is NumEntries. */
cpc_obj = &out_obj->package.elements[0];
if (cpc_obj->type == ACPI_TYPE_INTEGER) {
num_ent = cpc_obj->integer.value;
} else {
pr_debug("Unexpected entry type(%d) for NumEntries\n",
cpc_obj->type);
goto out_free;
}
/* Only support CPPCv2. Bail otherwise. */
if (num_ent != CPPC_NUM_ENT) {
pr_debug("Firmware exports %d entries. Expected: %d\n",
num_ent, CPPC_NUM_ENT);
goto out_free;
}
/* Second entry should be revision. */
cpc_obj = &out_obj->package.elements[1];
if (cpc_obj->type == ACPI_TYPE_INTEGER) {
cpc_rev = cpc_obj->integer.value;
} else {
pr_debug("Unexpected entry type(%d) for Revision\n",
cpc_obj->type);
goto out_free;
}
if (cpc_rev != CPPC_REV) {
pr_debug("Firmware exports revision:%d. Expected:%d\n",
cpc_rev, CPPC_REV);
goto out_free;
}
/* Iterate through remaining entries in _CPC */
for (i = 2; i < num_ent; i++) {
cpc_obj = &out_obj->package.elements[i];
if (cpc_obj->type == ACPI_TYPE_INTEGER) {
cpc_ptr->cpc_regs[i-2].type = ACPI_TYPE_INTEGER;
cpc_ptr->cpc_regs[i-2].cpc_entry.int_value = cpc_obj->integer.value;
} else if (cpc_obj->type == ACPI_TYPE_BUFFER) {
gas_t = (struct cpc_reg *)
cpc_obj->buffer.pointer;
/*
* The PCC Subspace index is encoded inside
* the CPC table entries. The same PCC index
* will be used for all the PCC entries,
* so extract it only once.
*/
if (gas_t->space_id == ACPI_ADR_SPACE_PLATFORM_COMM) {
if (pcc_subspace_idx < 0)
pcc_subspace_idx = gas_t->access_width;
else if (pcc_subspace_idx != gas_t->access_width) {
pr_debug("Mismatched PCC ids.\n");
goto out_free;
}
} else if (gas_t->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
/* Support only PCC and SYS MEM type regs */
pr_debug("Unsupported register type: %d\n", gas_t->space_id);
goto out_free;
}
cpc_ptr->cpc_regs[i-2].type = ACPI_TYPE_BUFFER;
memcpy(&cpc_ptr->cpc_regs[i-2].cpc_entry.reg, gas_t, sizeof(*gas_t));
} else {
pr_debug("Err in entry:%d in CPC table of CPU:%d \n", i, pr->id);
goto out_free;
}
}
/* Store CPU Logical ID */
cpc_ptr->cpu_id = pr->id;
/* Parse PSD data for this CPU */
ret = acpi_get_psd(cpc_ptr, handle);
if (ret)
goto out_free;
/* Register PCC channel once for all CPUs. */
if (!pcc_channel_acquired) {
ret = register_pcc_channel(pcc_subspace_idx);
if (ret)
goto out_free;
}
/* Plug PSD data into this CPUs CPC descriptor. */
per_cpu(cpc_desc_ptr, pr->id) = cpc_ptr;
/* Everything looks okay */
pr_debug("Parsed CPC struct for CPU: %d\n", pr->id);
kfree(output.pointer);
return 0;
out_free:
kfree(cpc_ptr);
out_buf_free:
kfree(output.pointer);
return ret;
}
/**
* acpi_cppc_processor_probe - Search for per CPU _CPC objects.
* @pr: Ptr to acpi_processor containing this CPUs logical Id.
*
* Return: 0 for success or negative value for err.
*/
int acpi_cppc_processor_probe(struct acpi_processor *pr)
{
struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
union acpi_object *out_obj, *cpc_obj;
struct cpc_desc *cpc_ptr;
struct cpc_reg *gas_t;
struct device *cpu_dev;
acpi_handle handle = pr->handle;
unsigned int num_ent, i, cpc_rev;
int pcc_subspace_id = -1;
acpi_status status;
int ret = -EFAULT;
/* Parse the ACPI _CPC table for this cpu. */
status = acpi_evaluate_object_typed(handle, "_CPC", NULL, &output,
ACPI_TYPE_PACKAGE);
if (ACPI_FAILURE(status)) {
ret = -ENODEV;
goto out_buf_free;
}
out_obj = (union acpi_object *) output.pointer;
cpc_ptr = kzalloc(sizeof(struct cpc_desc), GFP_KERNEL);
if (!cpc_ptr) {
ret = -ENOMEM;
goto out_buf_free;
}
/* First entry is NumEntries. */
cpc_obj = &out_obj->package.elements[0];
if (cpc_obj->type == ACPI_TYPE_INTEGER) {
num_ent = cpc_obj->integer.value;
} else {
pr_debug("Unexpected entry type(%d) for NumEntries\n",
cpc_obj->type);
goto out_free;
}
/* Only support CPPCv2. Bail otherwise. */
if (num_ent != CPPC_NUM_ENT) {
pr_debug("Firmware exports %d entries. Expected: %d\n",
num_ent, CPPC_NUM_ENT);
goto out_free;
}
cpc_ptr->num_entries = num_ent;
/* Second entry should be revision. */
cpc_obj = &out_obj->package.elements[1];
if (cpc_obj->type == ACPI_TYPE_INTEGER) {
cpc_rev = cpc_obj->integer.value;
} else {
pr_debug("Unexpected entry type(%d) for Revision\n",
cpc_obj->type);
goto out_free;
}
if (cpc_rev != CPPC_REV) {
pr_debug("Firmware exports revision:%d. Expected:%d\n",
cpc_rev, CPPC_REV);
goto out_free;
}
/* Iterate through remaining entries in _CPC */
for (i = 2; i < num_ent; i++) {
cpc_obj = &out_obj->package.elements[i];
if (cpc_obj->type == ACPI_TYPE_INTEGER) {
cpc_ptr->cpc_regs[i-2].type = ACPI_TYPE_INTEGER;
cpc_ptr->cpc_regs[i-2].cpc_entry.int_value = cpc_obj->integer.value;
} else if (cpc_obj->type == ACPI_TYPE_BUFFER) {
gas_t = (struct cpc_reg *)
cpc_obj->buffer.pointer;
/*
* The PCC Subspace index is encoded inside
* the CPC table entries. The same PCC index
* will be used for all the PCC entries,
* so extract it only once.
*/
if (gas_t->space_id == ACPI_ADR_SPACE_PLATFORM_COMM) {
if (pcc_subspace_id < 0) {
pcc_subspace_id = gas_t->access_width;
if (pcc_data_alloc(pcc_subspace_id))
goto out_free;
} else if (pcc_subspace_id != gas_t->access_width) {
pr_debug("Mismatched PCC ids.\n");
goto out_free;
}
} else if (gas_t->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
if (gas_t->address) {
void __iomem *addr;
addr = ioremap(gas_t->address, gas_t->bit_width/8);
if (!addr)
goto out_free;
cpc_ptr->cpc_regs[i-2].sys_mem_vaddr = addr;
}
} else {
if (gas_t->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE || !cpc_ffh_supported()) {
/* Support only PCC ,SYS MEM and FFH type regs */
pr_debug("Unsupported register type: %d\n", gas_t->space_id);
goto out_free;
}
}
cpc_ptr->cpc_regs[i-2].type = ACPI_TYPE_BUFFER;
memcpy(&cpc_ptr->cpc_regs[i-2].cpc_entry.reg, gas_t, sizeof(*gas_t));
} else {
pr_debug("Err in entry:%d in CPC table of CPU:%d \n", i, pr->id);
goto out_free;
}
}
per_cpu(cpu_pcc_subspace_idx, pr->id) = pcc_subspace_id;
/* Store CPU Logical ID */
cpc_ptr->cpu_id = pr->id;
/* Parse PSD data for this CPU */
ret = acpi_get_psd(cpc_ptr, handle);
if (ret)
goto out_free;
/* Register PCC channel once for all PCC subspace id. */
if (pcc_subspace_id >= 0 && !pcc_data[pcc_subspace_id]->pcc_channel_acquired) {
ret = register_pcc_channel(pcc_subspace_id);
if (ret)
goto out_free;
init_rwsem(&pcc_data[pcc_subspace_id]->pcc_lock);
init_waitqueue_head(&pcc_data[pcc_subspace_id]->pcc_write_wait_q);
}
/* Everything looks okay */
pr_debug("Parsed CPC struct for CPU: %d\n", pr->id);
/* Add per logical CPU nodes for reading its feedback counters. */
cpu_dev = get_cpu_device(pr->id);
if (!cpu_dev) {
ret = -EINVAL;
goto out_free;
}
/* Plug PSD data into this CPUs CPC descriptor. */
per_cpu(cpc_desc_ptr, pr->id) = cpc_ptr;
ret = kobject_init_and_add(&cpc_ptr->kobj, &cppc_ktype, &cpu_dev->kobj,
"acpi_cppc");
if (ret) {
per_cpu(cpc_desc_ptr, pr->id) = NULL;
goto out_free;
}
kfree(output.pointer);
return 0;
out_free:
/* Free all the mapped sys mem areas for this CPU */
for (i = 2; i < cpc_ptr->num_entries; i++) {
void __iomem *addr = cpc_ptr->cpc_regs[i-2].sys_mem_vaddr;
if (addr)
iounmap(addr);
}
kfree(cpc_ptr);
out_buf_free:
kfree(output.pointer);
return ret;
}
