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-rw-r--r--drivers/acpi/acpica/actables.h6
-rw-r--r--drivers/acpi/acpica/tbfadt.c14
-rw-r--r--drivers/acpi/acpica/tbutils.c85
-rw-r--r--drivers/acpi/acpica/tbxface.c130
-rw-r--r--drivers/acpi/bus.c2
-rw-r--r--drivers/acpi/nfit/core.c3
-rw-r--r--drivers/acpi/osl.c15
-rw-r--r--drivers/acpi/processor_core.c8
-rw-r--r--drivers/acpi/scan.c3
-rw-r--r--drivers/acpi/spcr.c8
-rw-r--r--drivers/acpi/tables.c17
11 files changed, 201 insertions, 90 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/tbfadt.c b/drivers/acpi/acpica/tbfadt.c
index 5fb838e592dc..81473a4880ce 100644
--- a/drivers/acpi/acpica/tbfadt.c
+++ b/drivers/acpi/acpica/tbfadt.c
@@ -311,6 +311,8 @@ void acpi_tb_parse_fadt(void)
{
u32 length;
struct acpi_table_header *table;
+ struct acpi_table_desc *fadt_desc;
+ acpi_status status;
/*
* The FADT has multiple versions with different lengths,
@@ -319,14 +321,12 @@ void acpi_tb_parse_fadt(void)
* Get a local copy of the FADT and convert it to a common format
* Map entire FADT, assumed to be smaller than one page.
*/
- length = acpi_gbl_root_table_list.tables[acpi_gbl_fadt_index].length;
-
- table =
- acpi_os_map_memory(acpi_gbl_root_table_list.
- tables[acpi_gbl_fadt_index].address, length);
- if (!table) {
+ fadt_desc = &acpi_gbl_root_table_list.tables[acpi_gbl_fadt_index];
+ status = acpi_tb_get_table(fadt_desc, &table);
+ if (ACPI_FAILURE(status)) {
return;
}
+ length = fadt_desc->length;
/*
* Validate the FADT checksum before we copy the table. Ignore
@@ -340,7 +340,7 @@ void acpi_tb_parse_fadt(void)
/* All done with the real FADT, unmap it */
- acpi_os_unmap_memory(table, length);
+ acpi_tb_put_table(fadt_desc);
/* Obtain the DSDT and FACS tables via their addresses within the FADT */
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/bus.c b/drivers/acpi/bus.c
index 5cbefd7621f0..95855cb9d6fb 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -974,7 +974,7 @@ void __init acpi_early_init(void)
if (!acpi_strict)
acpi_gbl_enable_interpreter_slack = TRUE;
- acpi_gbl_permanent_mmap = 1;
+ acpi_permanent_mmap = true;
/*
* If the machine falls into the DMI check table,
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 312c4b4dc363..2f82b8eba360 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -2806,12 +2806,13 @@ static int acpi_nfit_add(struct acpi_device *adev)
acpi_size sz;
int rc = 0;
- status = acpi_get_table_with_size(ACPI_SIG_NFIT, 0, &tbl, &sz);
+ status = acpi_get_table(ACPI_SIG_NFIT, 0, &tbl);
if (ACPI_FAILURE(status)) {
/* This is ok, we could have an nvdimm hotplugged later */
dev_dbg(dev, "failed to find NFIT at startup\n");
return 0;
}
+ sz = tbl->length;
acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
if (!acpi_desc)
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 9a4c6abee63e..a404ff4d7151 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -76,6 +76,7 @@ static struct workqueue_struct *kacpi_notify_wq;
static struct workqueue_struct *kacpi_hotplug_wq;
static bool acpi_os_initialized;
unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
+bool acpi_permanent_mmap = false;
/*
* This list of permanent mappings is for memory that may be accessed from
@@ -306,7 +307,7 @@ static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
* virtual address). If not found, map it, add it to that list and return a
* pointer to it.
*
- * During early init (when acpi_gbl_permanent_mmap has not been set yet) this
+ * During early init (when acpi_permanent_mmap has not been set yet) this
* routine simply calls __acpi_map_table() to get the job done.
*/
void __iomem *__ref
@@ -322,7 +323,7 @@ acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
return NULL;
}
- if (!acpi_gbl_permanent_mmap)
+ if (!acpi_permanent_mmap)
return __acpi_map_table((unsigned long)phys, size);
mutex_lock(&acpi_ioremap_lock);
@@ -392,7 +393,7 @@ static void acpi_os_map_cleanup(struct acpi_ioremap *map)
* mappings, drop a reference to it and unmap it if there are no more active
* references to it.
*
- * During early init (when acpi_gbl_permanent_mmap has not been set yet) this
+ * During early init (when acpi_permanent_mmap has not been set yet) this
* routine simply calls __acpi_unmap_table() to get the job done. Since
* __acpi_unmap_table() is an __init function, the __ref annotation is needed
* here.
@@ -401,7 +402,7 @@ void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
{
struct acpi_ioremap *map;
- if (!acpi_gbl_permanent_mmap) {
+ if (!acpi_permanent_mmap) {
__acpi_unmap_table(virt, size);
return;
}
@@ -426,12 +427,6 @@ void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
}
EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
-void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
-{
- if (!acpi_gbl_permanent_mmap)
- __acpi_unmap_table(virt, size);
-}
-
int acpi_os_map_generic_address(struct acpi_generic_address *gas)
{
u64 addr;
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 5c78ee1860b0..611a5585a902 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -154,18 +154,16 @@ static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt,
phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id)
{
struct acpi_table_madt *madt = NULL;
- acpi_size tbl_size;
phys_cpuid_t rv;
- acpi_get_table_with_size(ACPI_SIG_MADT, 0,
- (struct acpi_table_header **)&madt,
- &tbl_size);
+ 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, true);
- early_acpi_os_unmap_memory(madt, tbl_size);
+ acpi_put_table((struct acpi_table_header *)madt);
return rv;
}
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 3d1856f1f4d0..07aa2e649eb1 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1119,9 +1119,6 @@ acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
"support\n"));
*cap |= ACPI_VIDEO_BACKLIGHT;
- if (!acpi_has_method(handle, "_BQC"))
- printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "
- "cannot determine initial brightness\n");
/* We have backlight support, no need to scan further */
return AE_CTRL_TERMINATE;
}
diff --git a/drivers/acpi/spcr.c b/drivers/acpi/spcr.c
index e8d7bc7d4da8..b8019c4c1d38 100644
--- a/drivers/acpi/spcr.c
+++ b/drivers/acpi/spcr.c
@@ -33,7 +33,6 @@ int __init parse_spcr(bool earlycon)
{
static char opts[64];
struct acpi_table_spcr *table;
- acpi_size table_size;
acpi_status status;
char *uart;
char *iotype;
@@ -43,9 +42,8 @@ int __init parse_spcr(bool earlycon)
if (acpi_disabled)
return -ENODEV;
- status = acpi_get_table_with_size(ACPI_SIG_SPCR, 0,
- (struct acpi_table_header **)&table,
- &table_size);
+ status = acpi_get_table(ACPI_SIG_SPCR, 0,
+ (struct acpi_table_header **)&table);
if (ACPI_FAILURE(status))
return -ENOENT;
@@ -106,6 +104,6 @@ int __init parse_spcr(bool earlycon)
err = add_preferred_console(uart, 0, opts + strlen(uart) + 1);
done:
- early_acpi_os_unmap_memory((void __iomem *)table, table_size);
+ acpi_put_table((struct acpi_table_header *)table);
return err;
}
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index cdd56c4657e0..2604189d6cd1 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -333,7 +333,6 @@ acpi_table_parse_entries_array(char *id,
unsigned int max_entries)
{
struct acpi_table_header *table_header = NULL;
- acpi_size tbl_size;
int count;
u32 instance = 0;
@@ -346,7 +345,7 @@ acpi_table_parse_entries_array(char *id,
if (!strncmp(id, ACPI_SIG_MADT, 4))
instance = acpi_apic_instance;
- acpi_get_table_with_size(id, instance, &table_header, &tbl_size);
+ acpi_get_table(id, instance, &table_header);
if (!table_header) {
pr_warn("%4.4s not present\n", id);
return -ENODEV;
@@ -355,7 +354,7 @@ acpi_table_parse_entries_array(char *id,
count = acpi_parse_entries_array(id, table_size, table_header,
proc, proc_num, max_entries);
- early_acpi_os_unmap_memory((char *)table_header, tbl_size);
+ acpi_put_table(table_header);
return count;
}
@@ -397,7 +396,6 @@ acpi_table_parse_madt(enum acpi_madt_type id,
int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
{
struct acpi_table_header *table = NULL;
- acpi_size tbl_size;
if (acpi_disabled)
return -ENODEV;
@@ -406,13 +404,13 @@ int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
return -EINVAL;
if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
- acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size);
+ acpi_get_table(id, acpi_apic_instance, &table);
else
- acpi_get_table_with_size(id, 0, &table, &tbl_size);
+ acpi_get_table(id, 0, &table);
if (table) {
handler(table);
- early_acpi_os_unmap_memory(table, tbl_size);
+ acpi_put_table(table);
return 0;
} else
return -ENODEV;
@@ -426,16 +424,15 @@ int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
static void __init check_multiple_madt(void)
{
struct acpi_table_header *table = NULL;
- acpi_size tbl_size;
- acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size);
+ 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 linux-acpi@vger.kernel.org\n",
acpi_apic_instance ? 0 : 2);
- early_acpi_os_unmap_memory(table, tbl_size);
+ acpi_put_table(table);
} else
acpi_apic_instance = 0;
generated by cgit (git 2.34.1) at 2024-06-07 10:44:48 +0000