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-rw-r--r--drivers/acpi/acpica/actables.h6
-rw-r--r--drivers/acpi/acpica/tbutils.c85
-rw-r--r--drivers/acpi/acpica/tbxface.c130
-rw-r--r--drivers/acpi/osl.c39
-rw-r--r--include/acpi/acpixf.h12
-rw-r--r--include/acpi/actbl.h1
-rw-r--r--include/acpi/platform/aclinuxex.h1
7 files changed, 220 insertions, 54 deletions
diff --git a/drivers/acpi/acpica/actables.h b/drivers/acpi/acpica/actables.h
index 7dd527f8ca1d..94be8a8e6c08 100644
--- a/drivers/acpi/acpica/actables.h
+++ b/drivers/acpi/acpica/actables.h
@@ -166,6 +166,12 @@ acpi_tb_install_table_with_override(struct acpi_table_desc *new_table_desc,
acpi_status acpi_tb_parse_root_table(acpi_physical_address rsdp_address);
+acpi_status
+acpi_tb_get_table(struct acpi_table_desc *table_desc,
+ struct acpi_table_header **out_table);
+
+void acpi_tb_put_table(struct acpi_table_desc *table_desc);
+
/*
* tbxfload
*/
diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
index 51eb07cf9898..86854e846800 100644
--- a/drivers/acpi/acpica/tbutils.c
+++ b/drivers/acpi/acpica/tbutils.c
@@ -381,3 +381,88 @@ next_table:
acpi_os_unmap_memory(table, length);
return_ACPI_STATUS(AE_OK);
}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_get_table
+ *
+ * PARAMETERS: table_desc - Table descriptor
+ * out_table - Where the pointer to the table is returned
+ *
+ * RETURN: Status and pointer to the requested table
+ *
+ * DESCRIPTION: Increase a reference to a table descriptor and return the
+ * validated table pointer.
+ * If the table descriptor is an entry of the root table list,
+ * this API must be invoked with ACPI_MTX_TABLES acquired.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_get_table(struct acpi_table_desc *table_desc,
+ struct acpi_table_header **out_table)
+{
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(acpi_tb_get_table);
+
+ if (table_desc->validation_count == 0) {
+
+ /* Table need to be "VALIDATED" */
+
+ status = acpi_tb_validate_table(table_desc);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+ }
+
+ table_desc->validation_count++;
+ if (table_desc->validation_count == 0) {
+ ACPI_ERROR((AE_INFO,
+ "Table %p, Validation count is zero after increment\n",
+ table_desc));
+ table_desc->validation_count--;
+ return_ACPI_STATUS(AE_LIMIT);
+ }
+
+ *out_table = table_desc->pointer;
+ return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_put_table
+ *
+ * PARAMETERS: table_desc - Table descriptor
+ *
+ * RETURN: None
+ *
+ * DESCRIPTION: Decrease a reference to a table descriptor and release the
+ * validated table pointer if no references.
+ * If the table descriptor is an entry of the root table list,
+ * this API must be invoked with ACPI_MTX_TABLES acquired.
+ *
+ ******************************************************************************/
+
+void acpi_tb_put_table(struct acpi_table_desc *table_desc)
+{
+
+ ACPI_FUNCTION_TRACE(acpi_tb_put_table);
+
+ if (table_desc->validation_count == 0) {
+ ACPI_WARNING((AE_INFO,
+ "Table %p, Validation count is zero before decrement\n",
+ table_desc));
+ return_VOID;
+ }
+ table_desc->validation_count--;
+
+ if (table_desc->validation_count == 0) {
+
+ /* Table need to be "INVALIDATED" */
+
+ acpi_tb_invalidate_table(table_desc);
+ }
+
+ return_VOID;
+}
diff --git a/drivers/acpi/acpica/tbxface.c b/drivers/acpi/acpica/tbxface.c
index d5adb7ac4684..7684707b254b 100644
--- a/drivers/acpi/acpica/tbxface.c
+++ b/drivers/acpi/acpica/tbxface.c
@@ -282,7 +282,7 @@ ACPI_EXPORT_SYMBOL(acpi_get_table_header)
/*******************************************************************************
*
- * FUNCTION: acpi_get_table_with_size
+ * FUNCTION: acpi_get_table
*
* PARAMETERS: signature - ACPI signature of needed table
* instance - Which instance (for SSDTs)
@@ -292,16 +292,21 @@ ACPI_EXPORT_SYMBOL(acpi_get_table_header)
*
* DESCRIPTION: Finds and verifies an ACPI table. Table must be in the
* RSDT/XSDT.
+ * Note that an early stage acpi_get_table() call must be paired
+ * with an early stage acpi_put_table() call. otherwise the table
+ * pointer mapped by the early stage mapping implementation may be
+ * erroneously unmapped by the late stage unmapping implementation
+ * in an acpi_put_table() invoked during the late stage.
*
******************************************************************************/
acpi_status
-acpi_get_table_with_size(char *signature,
- u32 instance, struct acpi_table_header **out_table,
- acpi_size *tbl_size)
+acpi_get_table(char *signature,
+ u32 instance, struct acpi_table_header ** out_table)
{
u32 i;
u32 j;
- acpi_status status;
+ acpi_status status = AE_NOT_FOUND;
+ struct acpi_table_desc *table_desc;
/* Parameter validation */
@@ -309,13 +314,22 @@ acpi_get_table_with_size(char *signature,
return (AE_BAD_PARAMETER);
}
+ /*
+ * Note that the following line is required by some OSPMs, they only
+ * check if the returned table is NULL instead of the returned status
+ * to determined if this function is succeeded.
+ */
+ *out_table = NULL;
+
+ (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+
/* Walk the root table list */
for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
i++) {
- if (!ACPI_COMPARE_NAME
- (&(acpi_gbl_root_table_list.tables[i].signature),
- signature)) {
+ table_desc = &acpi_gbl_root_table_list.tables[i];
+
+ if (!ACPI_COMPARE_NAME(&table_desc->signature, signature)) {
continue;
}
@@ -323,43 +337,65 @@ acpi_get_table_with_size(char *signature,
continue;
}
- status =
- acpi_tb_validate_table(&acpi_gbl_root_table_list.tables[i]);
- if (ACPI_SUCCESS(status)) {
- *out_table = acpi_gbl_root_table_list.tables[i].pointer;
- *tbl_size = acpi_gbl_root_table_list.tables[i].length;
- }
-
- if (!acpi_gbl_permanent_mmap) {
- acpi_gbl_root_table_list.tables[i].pointer = NULL;
- }
-
- return (status);
+ status = acpi_tb_get_table(table_desc, out_table);
+ break;
}
- return (AE_NOT_FOUND);
+ (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+ return (status);
}
-ACPI_EXPORT_SYMBOL(acpi_get_table_with_size)
+ACPI_EXPORT_SYMBOL(acpi_get_table)
-acpi_status
-acpi_get_table(char *signature,
- u32 instance, struct acpi_table_header **out_table)
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_put_table
+ *
+ * PARAMETERS: table - The pointer to the table
+ *
+ * RETURN: None
+ *
+ * DESCRIPTION: Release a table returned by acpi_get_table() and its clones.
+ * Note that it is not safe if this function was invoked after an
+ * uninstallation happened to the original table descriptor.
+ * Currently there is no OSPMs' requirement to handle such
+ * situations.
+ *
+ ******************************************************************************/
+void acpi_put_table(struct acpi_table_header *table)
{
- acpi_size tbl_size;
+ u32 i;
+ struct acpi_table_desc *table_desc;
+
+ ACPI_FUNCTION_TRACE(acpi_put_table);
+
+ (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+
+ /* Walk the root table list */
+
+ for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
+ table_desc = &acpi_gbl_root_table_list.tables[i];
- return acpi_get_table_with_size(signature,
- instance, out_table, &tbl_size);
+ if (table_desc->pointer != table) {
+ continue;
+ }
+
+ acpi_tb_put_table(table_desc);
+ break;
+ }
+
+ (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+ return_VOID;
}
-ACPI_EXPORT_SYMBOL(acpi_get_table)
+ACPI_EXPORT_SYMBOL(acpi_put_table)
/*******************************************************************************
*
* FUNCTION: acpi_get_table_by_index
*
* PARAMETERS: table_index - Table index
- * table - Where the pointer to the table is returned
+ * out_table - Where the pointer to the table is returned
*
* RETURN: Status and pointer to the requested table
*
@@ -368,7 +404,7 @@ ACPI_EXPORT_SYMBOL(acpi_get_table)
*
******************************************************************************/
acpi_status
-acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table)
+acpi_get_table_by_index(u32 table_index, struct acpi_table_header **out_table)
{
acpi_status status;
@@ -376,35 +412,33 @@ acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table)
/* Parameter validation */
- if (!table) {
+ if (!out_table) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
+ /*
+ * Note that the following line is required by some OSPMs, they only
+ * check if the returned table is NULL instead of the returned status
+ * to determined if this function is succeeded.
+ */
+ *out_table = NULL;
+
(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
/* Validate index */
if (table_index >= acpi_gbl_root_table_list.current_table_count) {
- (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
- return_ACPI_STATUS(AE_BAD_PARAMETER);
+ status = AE_BAD_PARAMETER;
+ goto unlock_and_exit;
}
- if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
-
- /* Table is not mapped, map it */
+ status =
+ acpi_tb_get_table(&acpi_gbl_root_table_list.tables[table_index],
+ out_table);
- status =
- acpi_tb_validate_table(&acpi_gbl_root_table_list.
- tables[table_index]);
- if (ACPI_FAILURE(status)) {
- (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
- return_ACPI_STATUS(status);
- }
- }
-
- *table = acpi_gbl_root_table_list.tables[table_index].pointer;
+unlock_and_exit:
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
- return_ACPI_STATUS(AE_OK);
+ return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 416953a42510..9316dfc19cea 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -433,10 +433,45 @@ void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
}
EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
+/*******************************************************************************
+ *
+ * acpi_get_table_with_size()/early_acpi_os_unmap_memory():
+ *
+ * These 2 functions are traditionally used by Linux to map/unmap physical
+ * addressed ACPI tables during the early stage.
+ * They are deprectated now. Do not use them in the new code, but use
+ * acpi_get_table()/acpi_put_table() instead.
+ *
+ ******************************************************************************/
+acpi_status
+acpi_get_table_with_size(char *signature,
+ u32 instance, struct acpi_table_header **out_table,
+ acpi_size *tbl_size)
+{
+ acpi_status status;
+
+ status = acpi_get_table(signature, instance, out_table);
+ if (ACPI_SUCCESS(status)) {
+ /*
+ * "tbl_size" is no longer used by
+ * early_acpi_os_unmap_memory(), but is still used by the
+ * ACPI table drivers. So sets it to the length of the
+ * table when the tbl_size is requested.
+ * "out_table" is not sanity checked as AE_BAD_PARAMETER
+ * is returned if it is NULL.
+ */
+ if (tbl_size && *out_table)
+ *tbl_size = (*out_table)->length;
+ }
+
+ return (status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_get_table_with_size)
+
void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
{
- if (!acpi_gbl_permanent_mmap)
- __acpi_unmap_table(virt, size);
+ acpi_put_table(ACPI_CAST_PTR(struct acpi_table_header, virt));
}
int acpi_os_map_generic_address(struct acpi_generic_address *gas)
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index 5c7356adc10b..33828dd97fc5 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -513,10 +513,12 @@ ACPI_EXTERNAL_RETURN_STATUS(acpi_status
acpi_get_table(acpi_string signature, u32 instance,
struct acpi_table_header
**out_table))
+ACPI_EXTERNAL_RETURN_VOID(void acpi_put_table(struct acpi_table_header *table))
+
ACPI_EXTERNAL_RETURN_STATUS(acpi_status
- acpi_get_table_by_index(u32 table_index,
- struct acpi_table_header
- **out_table))
+ acpi_get_table_by_index(u32 table_index,
+ struct acpi_table_header
+ **out_table))
ACPI_EXTERNAL_RETURN_STATUS(acpi_status
acpi_install_table_handler(acpi_table_handler
handler, void *context))
@@ -974,6 +976,10 @@ ACPI_EXTERNAL_RETURN_STATUS(acpi_status
**out_table,
acpi_size *tbl_size))
+ACPI_EXTERNAL_RETURN_VOID(void
+ early_acpi_os_unmap_memory(void __iomem * virt,
+ acpi_size size))
+
ACPI_EXTERNAL_RETURN_STATUS(acpi_status
acpi_get_data_full(acpi_handle object,
acpi_object_handler handler,
diff --git a/include/acpi/actbl.h b/include/acpi/actbl.h
index c19700e2a2fe..da5708caf8a1 100644
--- a/include/acpi/actbl.h
+++ b/include/acpi/actbl.h
@@ -371,6 +371,7 @@ struct acpi_table_desc {
union acpi_name_union signature;
acpi_owner_id owner_id;
u8 flags;
+ u16 validation_count;
};
/* Masks for Flags field above */
diff --git a/include/acpi/platform/aclinuxex.h b/include/acpi/platform/aclinuxex.h
index a5509d87230a..7dbb1141f546 100644
--- a/include/acpi/platform/aclinuxex.h
+++ b/include/acpi/platform/aclinuxex.h
@@ -142,7 +142,6 @@ static inline void acpi_os_terminate_command_signals(void)
/*
* OSL interfaces added by Linux
*/
-void early_acpi_os_unmap_memory(void __iomem * virt, acpi_size size);
#endif /* __KERNEL__ */
generated by cgit (git 2.34.1) at 2024-07-01 03:34:15 +0000