diff options
Diffstat (limited to 'drivers/acpi/osl.c')
| -rw-r--r-- | drivers/acpi/osl.c | 94 |
1 files changed, 91 insertions, 3 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index 5691f165a952..c5b4f1ed9b71 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -88,6 +88,7 @@ struct acpi_res_list { char name[5]; /* only can have a length of 4 chars, make use of this one instead of res->name, no need to kalloc then */ struct list_head resource_list; + int count; }; static LIST_HEAD(resource_list_head); @@ -1358,6 +1359,89 @@ acpi_os_validate_interface (char *interface) return AE_SUPPORT; } +static inline int acpi_res_list_add(struct acpi_res_list *res) +{ + struct acpi_res_list *res_list_elem; + + list_for_each_entry(res_list_elem, &resource_list_head, + resource_list) { + + if (res->resource_type == res_list_elem->resource_type && + res->start == res_list_elem->start && + res->end == res_list_elem->end) { + + /* + * The Region(addr,len) already exist in the list, + * just increase the count + */ + + res_list_elem->count++; + return 0; + } + } + + res->count = 1; + list_add(&res->resource_list, &resource_list_head); + return 1; +} + +static inline void acpi_res_list_del(struct acpi_res_list *res) +{ + struct acpi_res_list *res_list_elem; + + list_for_each_entry(res_list_elem, &resource_list_head, + resource_list) { + + if (res->resource_type == res_list_elem->resource_type && + res->start == res_list_elem->start && + res->end == res_list_elem->end) { + + /* + * If the res count is decreased to 0, + * remove and free it + */ + + if (--res_list_elem->count == 0) { + list_del(&res_list_elem->resource_list); + kfree(res_list_elem); + } + return; + } + } +} + +acpi_status +acpi_os_invalidate_address( + u8 space_id, + acpi_physical_address address, + acpi_size length) +{ + struct acpi_res_list res; + + switch (space_id) { + case ACPI_ADR_SPACE_SYSTEM_IO: + case ACPI_ADR_SPACE_SYSTEM_MEMORY: + /* Only interference checks against SystemIO and SytemMemory + are needed */ + res.start = address; + res.end = address + length - 1; + res.resource_type = space_id; + spin_lock(&acpi_res_lock); + acpi_res_list_del(&res); + spin_unlock(&acpi_res_lock); + break; + case ACPI_ADR_SPACE_PCI_CONFIG: + case ACPI_ADR_SPACE_EC: + case ACPI_ADR_SPACE_SMBUS: + case ACPI_ADR_SPACE_CMOS: + case ACPI_ADR_SPACE_PCI_BAR_TARGET: + case ACPI_ADR_SPACE_DATA_TABLE: + case ACPI_ADR_SPACE_FIXED_HARDWARE: + break; + } + return AE_OK; +} + /****************************************************************************** * * FUNCTION: acpi_os_validate_address @@ -1382,6 +1466,7 @@ acpi_os_validate_address ( char *name) { struct acpi_res_list *res; + int added; if (acpi_enforce_resources == ENFORCE_RESOURCES_NO) return AE_OK; @@ -1399,14 +1484,17 @@ acpi_os_validate_address ( res->end = address + length - 1; res->resource_type = space_id; spin_lock(&acpi_res_lock); - list_add(&res->resource_list, &resource_list_head); + added = acpi_res_list_add(res); spin_unlock(&acpi_res_lock); - pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, " - "name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO) + pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, " + "name: %s\n", added ? "Added" : "Already exist", + (space_id == ACPI_ADR_SPACE_SYSTEM_IO) ? "SystemIO" : "System Memory", (unsigned long long)res->start, (unsigned long long)res->end, res->name); + if (!added) + kfree(res); break; case ACPI_ADR_SPACE_PCI_CONFIG: case ACPI_ADR_SPACE_EC: |