On Tue, 2009-02-03 at 14:57 +0900, Kenji Kaneshige wrote:
> Move PCI _OSC management code from drivers/pci/pci-acpi.c to
> drivers/acpi/pci_root.c. The benefits are
>
> - We no longer need struct osc_data and its management code (contents
> are moved to struct acpi_pci_root). This simplify the code, and we
> no longer care about kmalloc() failure.
>
> - We can make pci_acpi_osc_support() be a static function, which is
> called only from drivers/acpi/pci_root.c.
>
> Signed-off-by: Kenji Kaneshige <kaneshige.kenji@xxxxxxxxxxxxxx>
>
> ---
> drivers/acpi/pci_root.c | 178 ++++++++++++++++++++++++++++++++++++++
> drivers/pci/pci-acpi.c | 215 -----------------------------------------------
> include/linux/pci-acpi.h | 1
> 3 files changed, 176 insertions(+), 218 deletions(-)
>
> Index: 20090130/drivers/acpi/pci_root.c
> ===================================================================
> --- 20090130.orig/drivers/acpi/pci_root.c
> +++ 20090130/drivers/acpi/pci_root.c
> @@ -66,11 +66,18 @@ struct acpi_pci_root {
> struct acpi_device * device;
> struct acpi_pci_id id;
> struct pci_bus *bus;
> +
> + u32 osc_support_set; /* _OSC state of support bits */
> + u32 osc_control_set; /* _OSC state of control bits */
> + u32 osc_control_qry; /* the latest _OSC query result */
> +
> + u32 osc_queried:1; /* has _OSC control been queried? */
> };
>
> static LIST_HEAD(acpi_pci_roots);
>
> static struct acpi_pci_driver *sub_driver;
> +static DEFINE_MUTEX(osc_lock);
>
> int acpi_pci_register_driver(struct acpi_pci_driver *driver)
> {
> @@ -185,6 +192,173 @@ static void acpi_pci_bridge_scan(struct
> }
> }
>
> +static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
> + 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
> +
> +static acpi_status acpi_pci_run_osc(acpi_handle handle,
> + const u32 *capbuf, u32 *retval)
> +{
> + acpi_status status;
> + struct acpi_object_list input;
> + union acpi_object in_params[4];
> + struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
> + union acpi_object *out_obj;
> + u32 errors;
> +
> + /* Setting up input parameters */
> + input.count = 4;
> + input.pointer = in_params;
> + in_params[0].type = ACPI_TYPE_BUFFER;
> + in_params[0].buffer.length = 16;
> + in_params[0].buffer.pointer = OSC_UUID;
> + in_params[1].type = ACPI_TYPE_INTEGER;
> + in_params[1].integer.value = 1;
> + in_params[2].type = ACPI_TYPE_INTEGER;
> + in_params[2].integer.value = 3;
> + in_params[3].type = ACPI_TYPE_BUFFER;
> + in_params[3].buffer.length = 12;
> + in_params[3].buffer.pointer = (u8 *)capbuf;
> +
> + status = acpi_evaluate_object(handle, "_OSC", &input, &output);
> + if (ACPI_FAILURE(status))
> + return status;
> +
> + if (!output.length)
> + return AE_NULL_OBJECT;
> +
> + out_obj = output.pointer;
> + if (out_obj->type != ACPI_TYPE_BUFFER) {
> + printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
> + status = AE_TYPE;
> + goto out_kfree;
> + }
> + /* Need to ignore the bit0 in result code */
> + errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
> + if (errors) {
> + if (errors & OSC_REQUEST_ERROR)
> + printk(KERN_DEBUG "_OSC request fails\n");
> + if (errors & OSC_INVALID_UUID_ERROR)
> + printk(KERN_DEBUG "_OSC invalid UUID\n");
> + if (errors & OSC_INVALID_REVISION_ERROR)
> + printk(KERN_DEBUG "_OSC invalid revision\n");
> + if (errors & OSC_CAPABILITIES_MASK_ERROR) {
> + if (capbuf[OSC_QUERY_TYPE] & OSC_QUERY_ENABLE)
> + goto out_success;
> + printk(KERN_DEBUG "_OSC FW not grant req. control\n");
Can this be worded better? Perhaps "Firmware would not grant requested
_OSC control"? I know this is not your code, but maybe we can fix this
now.
> + status = AE_SUPPORT;
> + goto out_kfree;
> + }
> + status = AE_ERROR;
> + goto out_kfree;
> + }
> +out_success:
> + *retval = *((u32 *)(out_obj->buffer.pointer + 8));
> + status = AE_OK;
> +
> +out_kfree:
> + kfree(output.pointer);
> + return status;
> +}
> +
> +static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, u32 flags)
> +{
> + acpi_status status;
> + u32 support_set, result, capbuf[3];
> +
> + /* do _OSC query for all possible controls */
> + support_set = root->osc_support_set | (flags & OSC_SUPPORT_MASKS);
> + capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
> + capbuf[OSC_SUPPORT_TYPE] = support_set;
> + capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
> +
> + status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
> + if (ACPI_SUCCESS(status)) {
> + root->osc_support_set = support_set;
> + root->osc_control_qry = result;
> + root->osc_queried = 1;
> + }
> + return status;
> +}
> +
> +static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
> +{
> + acpi_status status;
> + acpi_handle tmp;
> +
> + status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
> + if (ACPI_FAILURE(status))
> + return status;
> + mutex_lock(&osc_lock);
> + status = acpi_pci_query_osc(root, flags);
> + mutex_unlock(&osc_lock);
> + return status;
> +}
> +
> +static struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
> +{
> + struct acpi_pci_root *root;
> + list_for_each_entry(root, &acpi_pci_roots, node) {
> + if (root->device->handle == handle)
> + return root;
> + }
> + return NULL;
> +}
> +
> +/**
> + * pci_osc_control_set - commit requested control to Firmware
Should this function be renamed to acpi_pci_osc_control_set?
> + * @handle: acpi_handle for the target ACPI object
> + * @flags: driver's requested control bits
> + *
> + * Attempt to take control from Firmware on requested control bits.
> + **/
> +acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
> +{
> + acpi_status status;
> + u32 control_req, result, capbuf[3];
> + acpi_handle tmp;
> + struct acpi_pci_root *root;
> +
> + status = acpi_get_handle(handle, "_OSC", &tmp);
> + if (ACPI_FAILURE(status))
> + return status;
> +
> + control_req = (flag
> s & OSC_CONTROL_MASKS);
> + if (!control_req)
> + return AE_TYPE;
> +
> + root = acpi_pci_find_root(handle);
> + if (!root)
> + return AE_NOT_EXIST;
> +
> + mutex_lock(&osc_lock);
> + /* No need to evaluate _OSC if the control was already granted. */
> + if ((root->osc_control_set & control_req) == control_req)
> + goto out;
> +
> + /* Need to query controls first before requesting them */
> + if (!root->osc_queried) {
> + status = acpi_pci_query_osc(root, root->osc_support_set);
> + if (ACPI_FAILURE(status))
> + goto out;
> + }
> + if ((root->osc_control_qry & control_req) != control_req) {
> + printk(KERN
> _DEBUG "_OSC FW not grant req. control\n");
See above.
> + status = AE_SUPPORT;
> + goto out;
> + }
> +
> + capbuf[OSC_QUERY_TYPE] = 0;
> + capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
> + capbuf[OSC_CONTROL_TYPE] = root->osc_control_set | control_req;
> + status = acpi_pci_run_osc(handle, capbuf, &result);
> + if (ACPI_SUCCESS(status))
> + root->osc_control_set = result;
> +out:
> + mutex_unlock(&osc_lock);
> + return status;
> +}
> +EXPORT_SYMBOL(pci_osc_control_set);
> +
> static int __devinit acpi_pci_root_add(struct acpi_device *device)
> {
> int result = 0;
> @@ -217,7 +391,7 @@ static int __devinit acpi_pci_root_add(s
> * PCI domains, so we indicate this in _OSC support capabilities.
> */
> flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
> - pci_acpi_osc_support(device->handle, flags);
> + acpi_pci_osc_support(root, flags);
>
> /*
> * Segment
> @@ -353,7 +527,7 @@ static int __devinit acpi_pci_root_add(s
> if (pci_msi_enabled())
> flags |= OS
> C_MSI_SUPPORT;
> if (flags != base_flags)
> - pci_acpi_osc_support(device->handle, flags);
> + acpi_pci_osc_support(root, flags);
>
> end:
> if (result) {
> Index: 20090130/drivers/pci/pci-acpi.c
> ===================================================================
> --- 20090130.orig/drivers/pci/pci-acpi.c
> +++ 20090130/drivers/pci/pci-acpi.c
> @@ -18,221 +18,6 @@
> #include <linux/pci-acpi.h>
> #include "pci.h"
>
> -struct acpi_osc_data {
> - acpi_handle handle;
> - u32 support_set;
> - u32 control_set;
> - u32 control_query;
> - int is_queried;
> - struct list_head sibiling;
> -};
> -static LIST_HEAD(acpi_osc_data_list);
> -
> -struct acpi_osc_args {
> - u32 capbuf[3];
> -};
> -
> -static DEFINE_MUTEX(pci_acpi_lock);
> -
> -static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
> -{
> - struct acpi_osc_data *data;
> -
> - list_for_each_entry(data, &acpi_osc_data_list, sibiling) {
> - if (data->handle == handle)
> - return data;
> - }
> - data = kzalloc(sizeof(*data), GFP_KERNEL);
> - if (!data)
> - return NULL;
> - INIT_LIST_HEAD(&data->sibiling);
> - data->handle = handle;
> - list_add_tail(&data->sibiling, &acpi_osc_data_list);
> - return data;
> -}
> -
> -static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
> - 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
> -
> -static acpi_status acpi_run_osc(acpi_handle handle,
> - struct acpi_osc_args *osc_args, u32 *retval)
> -{
> - acpi_status status;
> - struct acpi_object_list input;
> - union acpi_object in_params[4];
> - struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
> - union acpi_object *out_obj;
> - u32 errors, flags = osc_args->capbuf[OSC_QUERY_TYPE];
> -
> - /* Setting up input parameters */
> - input.count = 4;
> - input.pointer = in_params;
> - in_params[0].type = ACPI_TYPE_BUFFER;
> - in_params[0].buffer.length = 16;
> - in_params[0].buffer.pointer = OSC_UUID;
> - in_params[1].type = ACPI_TYPE_INTEGER;
> - in_params[1].integer.value = 1;
> - in_params[2].type = ACPI_TYPE_INTEGER;
> - in_params[2].integer.value = 3;
> - in_params[3].type = ACPI_TYPE_BUFFER;
> - in_params[3].buffer.length = 12;
> - in_params[3].buffer.pointer = (u8 *)osc_args->capbuf;
> -
> - status = acpi_evaluate_object(handle, "_OSC", &input, &output);
> - if (ACPI_FAILURE(status))
> - return status;
> -
> - if (!output.length)
> - return AE_NULL_OBJECT;
> -
> - out_obj = output.pointer;
> - if (out_obj->type != ACPI_TYPE_BUFFER) {
> - printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
> - status = AE_TYPE;
> - goto out_kfree;
> - }
> - /* Need to ignore the bit0 in result code */
> - errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
> - if (errors) {
> - if (errors & OSC_REQUEST_ERROR)
> - printk(KERN_DEBUG "_OSC request fails\n");
> - if (errors & OSC_INVALID_UUID_ERROR)
> - printk(KERN_DEBUG "_OSC invalid UUID\n");
> - if (errors & OSC_INVALID_REVISION_ERROR)
> - printk(KERN_DEBUG "_OSC invalid revision\n");
> - if (errors & OSC_CAPABILITIES_MASK_ERROR) {
> - if (flags & OSC_QUERY_ENABLE)
> - goto out_success;
> - printk(KERN_DEBUG "_OSC FW not grant req. control\n");
> - status = AE_SUPPORT;
> - goto out_kfree;
> - }
> - status = AE_ERROR;
> - goto out_kfree;
> - }
> -out_success:
> - *retval = *((u32 *)(out_obj->buffer.pointer + 8));
> - status = AE_OK;
> -
> -out_kfree:
> - kfree(output.pointer);
> - return status;
> -}
> -
> -static acpi_status __acpi_
> query_osc(u32 flags, struct acpi_osc_data *osc_data)
> -{
> - acpi_status status;
> - u32 support_set, result;
> - struct acpi_osc_args osc_args;
> -
> - /* do _OSC query for all possible controls */
> - support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
> - osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
> - osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
> - osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
> -
> - status = acpi_run_osc(osc_data->handle, &osc_args, &result);
> - if (ACPI_SUCCESS(status)) {
> - osc_data->support_set = support_set;
> - osc_data->control_query = result;
> - osc_data->is_queried = 1;
> - }
> -
> - return status;
> -}
> -
> -/*
> - * pci_acpi_osc_support: Invoke _OSC indicating support for the given feature
> - * @flags: Bitmask of flags to support
> - *
> - * See the ACPI spec for the definition of the flags
> - */
> -int pci_acpi_osc_support(acpi_handle handle, u32 flags)
> -{
> - acpi_status status;
> - acpi_handle tmp;
> - struct acpi_osc_data *osc_data;
> - int rc = 0;
> -
> - status = acpi_get_handle(handle, "_OSC", &tmp);
> - if (ACPI_FAILURE(status))
> - return -ENOTTY;
> -
> - mutex_lock(&pci_acpi_lock);
> - osc_data = acpi_get_osc_data(handle);
> - if (!osc_data) {
> - printk(KERN_ERR "acpi osc data array is full\n");
> - rc = -ENOMEM;
> - goto out;
> - }
> -
> - __acpi_query_osc(flags, osc_data);
> -out:
> - mutex_unlock(&pci_acpi_lock);
> - return rc;
> -}
> -
> -/**
> - * pci_osc_control_set - commit requested control to Firmware
> - * @handle: acpi_handle for the target ACPI object
> - * @flags: driver's requested control bits
> - *
> - * Attempt to take control from Firmware on requested control bits.
> - **/
> -acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
> -{
> - acpi_status status;
> - u32 control_req, control_set, result;
> - acpi_handle tmp;
> - struct acpi_osc_data *osc_data;
> - struct acpi_osc_args osc_args;
> -
> - status = acpi_get_handle(handle, "_OSC", &tmp);
> - if (ACPI_FAILURE(status))
> - return status;
> -
> - mutex_lock(&pci_acpi_lock);
> - osc_data = acpi_get_osc_data(handle);
> - if (!osc_data) {
> - printk(KERN_ERR "acpi osc data array is full\n");
> - status = AE_ERROR;
> - goto out;
> - }
> -
> - control_req = (flags & OSC_CONTROL_MASKS);
> - if (!control_req) {
> - status = AE_TYPE;
> - goto out;
> - }
> -
> - /* No need to evaluate _OSC if the control was already granted. */
> - if ((osc_data->control_set & control_req) == control_req)
> - goto out;
> -
> - if (!osc_data->is_queried) {
> - status = __acpi_query_osc(osc_data->support_set, osc_data);
> - if (ACPI_FAILURE(status))
> - goto out;
> - }
> -
> - if ((osc_data->control_query & control_req) != control_req) {
> - status = AE_SUPPORT;
> - goto out;
> - }
> -
> - control_set = osc_data->control_set | control_req;
> - osc_args.capbuf[OSC_QUERY_TYPE] = 0;
> - osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
> - osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
> - status = acpi_run_osc(handle, &osc_args, &result);
> - if (ACPI_SUCCESS(status))
> - osc_data->control_set = result;
> -out:
> - mutex_unlock(&pci_acpi_lock);
> - return status;
> -}
> -EXPORT_SYMBOL(pci_osc_control_set);
> -
> /*
> * _SxD returns the D-state with the highest power
> * (lowest D-state number) supported in the S-state "x".
> Index: 20090130/include/linux/pci-acpi.h
> ===================================================================
> --- 20090130.orig/include/linux/pci-acpi.h
> +++ 20090130/include/linux/pci-acpi.h
> @@ -50,7 +50,6 @@
>
> #ifdef CONFIG_ACPI
> extern acpi_status pci_osc_control_set(acpi_handle handle, u32 flags);
> -int pci_acpi_osc_support(acpi_handle handle, u32 flags);
> static inline acpi_handle acpi_find_root_bridge_handle(struct pci_dev *pdev)
> {
> /* Find root host bridge */
--
Andrew Patterson
Hewlett-Packard Company
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