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vga_switcheroo: initial implementation (v15)

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Many new laptops now come with 2 gpus, one to be used for low power
modes and one for gaming/on-ac applications. These GPUs are typically
wired to the laptop panel and VGA ports via a multiplexer unit which
is controlled via ACPI methods.

4 combinations of systems typically exist - with 2 ACPI methods.
Intel/ATI - Lenovo W500/T500 - use ATPX ACPI method
ATI/ATI - some ASUS - use ATPX ACPI Method
Intel/Nvidia - - use _DSM ACPI method
Nvidia/Nvidia -  - use _DSM ACPI method.

TODO:
This patch adds support for the ATPX method and initial bits
for the _DSM methods that need to written by someone with
access to the hardware.
Add a proper non-debugfs interface - need to get some proper
testing first.

v2: add power up/down support for both devices
on W500 puts i915/radeon into D3 and cuts power to radeon.

v3: redo probing methods, no DMI list, drm devices call to
register with switcheroo, it tries to find an ATPX method on
any device and once there is two devices + ATPX it inits the
switcher.

v4: ATPX msg handling using buffers - should work on more machines

v5: rearchitect after more mjg59 discussion - move ATPX handling to
    radeon driver.

v6: add file headers + initial nouveau bits (to be filled out).

v7: merge delayed switcher code.

v8: avoid suspend/resume of gpu that is off

v9: rearchitect - mjg59 is always right. - move all ATPX code to
radeon, should allow simpler DSM also proper ATRM handling

v10: add ATRM support for radeon BIOS, add mutex to lock vgasr_priv

v11: fix bug in resuming Intel for 2nd time.

v12: start fixing up nvidia code blindly.

v13: blindly guess at finishing nvidia code

v14: remove radeon audio hacks - fix up intel resume more like upstream

v15: clean up printks + remove unnecessary igd/dis pointers

mount debugfs

/sys/kernel/debug/vgaswitcheroo/switch - should exist if ATPX detected
 + 2 cards.

DIS - immediate change to discrete
IGD - immediate change to IGD
DDIS - delayed change to discrete
DIGD - delayed change to IGD
ON - turn on not in use
OFF - turn off not in use

Tested on W500 (Intel/ATI) and T500 (Intel/ATI)

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2010-02-01 15:38:10 +10:00 committed by Dave Airlie
parent 9fd1de5294
commit 6a9ee8af34
24 changed files with 1106 additions and 72 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/gpu/drm/i915/i915_dma.c
View File

@ -35,6 +35,7 @@
#include "i915_drv.h"
#include "i915_trace.h"
#include <linux/vgaarb.h>
#include <linux/vga_switcheroo.h>
/* Really want an OS-independent resettable timer. Would like to have
* this loop run for (eg) 3 sec, but have the timer reset every time
@ -1199,6 +1200,32 @@ static unsigned int i915_vga_set_decode(void *cookie, bool state)
return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
}
static void i915_switcheroo_set_state(struct pci_dev *pdev, enum vga_switcheroo_state state)
{
struct drm_device *dev = pci_get_drvdata(pdev);
pm_message_t pmm = { .event = PM_EVENT_SUSPEND };
if (state == VGA_SWITCHEROO_ON) {
printk(KERN_INFO "i915: switched off\n");
/* i915 resume handler doesn't set to D0 */
pci_set_power_state(dev->pdev, PCI_D0);
i915_resume(dev);
} else {
printk(KERN_ERR "i915: switched off\n");
i915_suspend(dev, pmm);
}
}
static bool i915_switcheroo_can_switch(struct pci_dev *pdev)
{
struct drm_device *dev = pci_get_drvdata(pdev);
bool can_switch;
spin_lock(&dev->count_lock);
can_switch = (dev->open_count == 0);
spin_unlock(&dev->count_lock);
return can_switch;
}
static int i915_load_modeset_init(struct drm_device *dev,
unsigned long prealloc_start,
unsigned long prealloc_size,
@ -1260,6 +1287,12 @@ static int i915_load_modeset_init(struct drm_device *dev,
if (ret)
goto destroy_ringbuffer;
ret = vga_switcheroo_register_client(dev->pdev,
i915_switcheroo_set_state,
i915_switcheroo_can_switch);
if (ret)
goto destroy_ringbuffer;
intel_modeset_init(dev);
ret = drm_irq_install(dev);
@ -1544,6 +1577,7 @@ int i915_driver_unload(struct drm_device *dev)
dev_priv->child_dev_num = 0;
}
drm_irq_uninstall(dev);
vga_switcheroo_unregister_client(dev->pdev);
vga_client_register(dev->pdev, NULL, NULL, NULL);
}
@ -1611,6 +1645,7 @@ void i915_driver_lastclose(struct drm_device * dev)
if (!dev_priv || drm_core_check_feature(dev, DRIVER_MODESET)) {
drm_fb_helper_restore();
vga_switcheroo_process_delayed_switch();
return;
}

4
drivers/gpu/drm/i915/i915_drv.c
View File

@ -201,7 +201,7 @@ static int i915_drm_freeze(struct drm_device *dev)
return 0;
}
static int i915_suspend(struct drm_device *dev, pm_message_t state)
int i915_suspend(struct drm_device *dev, pm_message_t state)
{
int error;
@ -255,7 +255,7 @@ static int i915_drm_thaw(struct drm_device *dev)
return error;
}
static int i915_resume(struct drm_device *dev)
int i915_resume(struct drm_device *dev)
{
if (pci_enable_device(dev->pdev))
return -EIO;

2
drivers/gpu/drm/i915/i915_drv.h
View File

@ -736,6 +736,8 @@ extern unsigned int i915_fbpercrtc;
extern unsigned int i915_powersave;
extern unsigned int i915_lvds_downclock;
extern int i915_suspend(struct drm_device *dev, pm_message_t state);
extern int i915_resume(struct drm_device *dev);
extern void i915_save_display(struct drm_device *dev);
extern void i915_restore_display(struct drm_device *dev);
extern int i915_master_create(struct drm_device *dev, struct drm_master *master);

2
drivers/gpu/drm/i915/intel_fb.c
View File

@ -35,6 +35,7 @@
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/vga_switcheroo.h>
#include "drmP.h"
#include "drm.h"
@ -235,6 +236,7 @@ static int intelfb_create(struct drm_device *dev, uint32_t fb_width,
obj_priv->gtt_offset, fbo);
mutex_unlock(&dev->struct_mutex);
vga_switcheroo_client_fb_set(dev->pdev, info);
return 0;
out_unpin:

164
drivers/gpu/drm/nouveau/nouveau_acpi.c
View File

@ -11,6 +11,8 @@
#include "nouveau_drm.h"
#include "nv50_display.h"
#include <linux/vga_switcheroo.h>
#define NOUVEAU_DSM_SUPPORTED 0x00
#define NOUVEAU_DSM_SUPPORTED_FUNCTIONS 0x00
@ -28,31 +30,30 @@
#define NOUVEAU_DSM_POWER_SPEED 0x01
#define NOUVEAU_DSM_POWER_STAMINA 0x02
static int nouveau_dsm(struct drm_device *dev, int func, int arg, int *result)
{
static char muid[] = {
0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
};
static struct nouveau_dsm_priv {
bool dsm_detected;
acpi_handle dhandle;
acpi_handle dsm_handle;
} nouveau_dsm_priv;
struct pci_dev *pdev = dev->pdev;
struct acpi_handle *handle;
static const char nouveau_dsm_muid[] = {
0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
};
static int nouveau_dsm(acpi_handle handle, int func, int arg, int *result)
{
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_object_list input;
union acpi_object params[4];
union acpi_object *obj;
int err;
handle = DEVICE_ACPI_HANDLE(&pdev->dev);
if (!handle)
return -ENODEV;
input.count = 4;
input.pointer = params;
params[0].type = ACPI_TYPE_BUFFER;
params[0].buffer.length = sizeof(muid);
params[0].buffer.pointer = (char *)muid;
params[0].buffer.length = sizeof(nouveau_dsm_muid);
params[0].buffer.pointer = (char *)nouveau_dsm_muid;
params[1].type = ACPI_TYPE_INTEGER;
params[1].integer.value = 0x00000102;
params[2].type = ACPI_TYPE_INTEGER;
@ -62,7 +63,7 @@ static int nouveau_dsm(struct drm_device *dev, int func, int arg, int *result)
err = acpi_evaluate_object(handle, "_DSM", &input, &output);
if (err) {
NV_INFO(dev, "failed to evaluate _DSM: %d\n", err);
printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
return err;
}
@ -86,40 +87,119 @@ static int nouveau_dsm(struct drm_device *dev, int func, int arg, int *result)
return 0;
}
int nouveau_hybrid_setup(struct drm_device *dev)
static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
{
int result;
if (nouveau_dsm(dev, NOUVEAU_DSM_POWER, NOUVEAU_DSM_POWER_STATE,
&result))
return -ENODEV;
NV_INFO(dev, "_DSM hardware status gave 0x%x\n", result);
if (result) { /* Ensure that the external GPU is enabled */
nouveau_dsm(dev, NOUVEAU_DSM_LED, NOUVEAU_DSM_LED_SPEED, NULL);
nouveau_dsm(dev, NOUVEAU_DSM_POWER, NOUVEAU_DSM_POWER_SPEED,
NULL);
} else { /* Stamina mode - disable the external GPU */
nouveau_dsm(dev, NOUVEAU_DSM_LED, NOUVEAU_DSM_LED_STAMINA,
NULL);
nouveau_dsm(dev, NOUVEAU_DSM_POWER, NOUVEAU_DSM_POWER_STAMINA,
NULL);
}
return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
}
static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
{
int arg;
if (state == VGA_SWITCHEROO_ON)
arg = NOUVEAU_DSM_POWER_SPEED;
else
arg = NOUVEAU_DSM_POWER_STAMINA;
nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
return 0;
}
bool nouveau_dsm_probe(struct drm_device *dev)
static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
{
int support = 0;
if (id == VGA_SWITCHEROO_IGD)
return nouveau_dsm_switch_mux(nouveau_dsm_priv.dsm_handle, NOUVEAU_DSM_LED_STAMINA);
else
return nouveau_dsm_switch_mux(nouveau_dsm_priv.dsm_handle, NOUVEAU_DSM_LED_SPEED);
}
if (nouveau_dsm(dev, NOUVEAU_DSM_SUPPORTED,
NOUVEAU_DSM_SUPPORTED_FUNCTIONS, &support))
return false;
if (!support)
static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
enum vga_switcheroo_state state)
{
if (id == VGA_SWITCHEROO_IGD)
return 0;
return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dsm_handle, state);
}
static int nouveau_dsm_init(void)
{
return 0;
}
static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
{
if (nouveau_dsm_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev))
return VGA_SWITCHEROO_IGD;
else
return VGA_SWITCHEROO_DIS;
}
static struct vga_switcheroo_handler nouveau_dsm_handler = {
.switchto = nouveau_dsm_switchto,
.power_state = nouveau_dsm_power_state,
.init = nouveau_dsm_init,
.get_client_id = nouveau_dsm_get_client_id,
};
static bool nouveau_dsm_pci_probe(struct pci_dev *pdev)
{
acpi_handle dhandle, nvidia_handle;
acpi_status status;
int ret;
uint32_t result;
dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
if (!dhandle)
return false;
status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
if (ACPI_FAILURE(status)) {
return false;
}
ret= nouveau_dsm(nvidia_handle, NOUVEAU_DSM_SUPPORTED,
NOUVEAU_DSM_SUPPORTED_FUNCTIONS, &result);
if (ret < 0)
return false;
nouveau_dsm_priv.dhandle = dhandle;
nouveau_dsm_priv.dsm_handle = nvidia_handle;
return true;
}
static bool nouveau_dsm_detect(void)
{
char acpi_method_name[255] = { 0 };
struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
struct pci_dev *pdev = NULL;
int has_dsm = 0;
int vga_count = 0;
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
vga_count++;
has_dsm |= (nouveau_dsm_pci_probe(pdev) == true);
}
if (vga_count == 2 && has_dsm) {
acpi_get_name(nouveau_dsm_priv.dsm_handle, ACPI_FULL_PATHNAME, &buffer);
printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
acpi_method_name);
nouveau_dsm_priv.dsm_detected = true;
return true;
}
return false;
}
void nouveau_register_dsm_handler(void)
{
bool r;
r = nouveau_dsm_detect();
if (!r)
return;
vga_switcheroo_register_handler(&nouveau_dsm_handler);
}
void nouveau_unregister_dsm_handler(void)
{
vga_switcheroo_unregister_handler();
}

9
drivers/gpu/drm/nouveau/nouveau_drv.c
View File

@ -135,7 +135,7 @@ nouveau_pci_remove(struct pci_dev *pdev)
drm_put_dev(dev);
}
static int
int
nouveau_pci_suspend(struct pci_dev *pdev, pm_message_t pm_state)
{
struct drm_device *dev = pci_get_drvdata(pdev);
@ -233,7 +233,7 @@ nouveau_pci_suspend(struct pci_dev *pdev, pm_message_t pm_state)
return ret;
}
static int
int
nouveau_pci_resume(struct pci_dev *pdev)
{
struct drm_device *dev = pci_get_drvdata(pdev);
@ -402,8 +402,10 @@ static int __init nouveau_init(void)
nouveau_modeset = 1;
}
if (nouveau_modeset == 1)
if (nouveau_modeset == 1) {
driver.driver_features |= DRIVER_MODESET;
nouveau_register_dsm_handler();
}
return drm_init(&driver);
}
@ -411,6 +413,7 @@ static int __init nouveau_init(void)
static void __exit nouveau_exit(void)
{
drm_exit(&driver);
nouveau_unregister_dsm_handler();
}
module_init(nouveau_init);

19
drivers/gpu/drm/nouveau/nouveau_drv.h
View File

@ -614,7 +614,6 @@ struct drm_nouveau_private {
} susres;
struct backlight_device *backlight;
bool acpi_dsm;
struct nouveau_channel *evo;
@ -682,6 +681,9 @@ extern int nouveau_ignorelid;
extern int nouveau_nofbaccel;
extern int nouveau_noaccel;
extern int nouveau_pci_suspend(struct pci_dev *pdev, pm_message_t pm_state);
extern int nouveau_pci_resume(struct pci_dev *pdev);
/* nouveau_state.c */
extern void nouveau_preclose(struct drm_device *dev, struct drm_file *);
extern int nouveau_load(struct drm_device *, unsigned long flags);
@ -848,19 +850,8 @@ extern int nouveau_dma_init(struct nouveau_channel *);
extern int nouveau_dma_wait(struct nouveau_channel *, int size);
/* nouveau_acpi.c */
#ifdef CONFIG_ACPI
extern int nouveau_hybrid_setup(struct drm_device *dev);
extern bool nouveau_dsm_probe(struct drm_device *dev);
#else
static inline int nouveau_hybrid_setup(struct drm_device *dev)
{
return 0;
}
static inline bool nouveau_dsm_probe(struct drm_device *dev)
{
return false;
}
#endif
void nouveau_register_dsm_handler(void);
void nouveau_unregister_dsm_handler(void);
/* nouveau_backlight.c */
#ifdef CONFIG_DRM_NOUVEAU_BACKLIGHT

2
drivers/gpu/drm/nouveau/nouveau_fbcon.c
View File

@ -36,6 +36,7 @@
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/screen_info.h>
#include <linux/vga_switcheroo.h>
#include "drmP.h"
#include "drm.h"
@ -370,6 +371,7 @@ nouveau_fbcon_create(struct drm_device *dev, uint32_t fb_width,
nvbo->bo.offset, nvbo);
mutex_unlock(&dev->struct_mutex);
vga_switcheroo_client_fb_set(dev->pdev, info);
return 0;
out_unref:

32
drivers/gpu/drm/nouveau/nouveau_state.c
View File

@ -29,6 +29,7 @@
#include "drm_sarea.h"
#include "drm_crtc_helper.h"
#include <linux/vgaarb.h>
#include <linux/vga_switcheroo.h>
#include "nouveau_drv.h"
#include "nouveau_drm.h"
@ -371,6 +372,30 @@ nouveau_card_init_channel(struct drm_device *dev)
return ret;
}
static void nouveau_switcheroo_set_state(struct pci_dev *pdev,
enum vga_switcheroo_state state)
{
pm_message_t pmm = { .event = PM_EVENT_SUSPEND };
if (state == VGA_SWITCHEROO_ON) {
printk(KERN_ERR "VGA switcheroo: switched nouveau on\n");
nouveau_pci_resume(pdev);
} else {
printk(KERN_ERR "VGA switcheroo: switched nouveau off\n");
nouveau_pci_suspend(pdev, pmm);
}
}
static bool nouveau_switcheroo_can_switch(struct pci_dev *pdev)
{
struct drm_device *dev = pci_get_drvdata(pdev);
bool can_switch;
spin_lock(&dev->count_lock);
can_switch = (dev->open_count == 0);
spin_unlock(&dev->count_lock);
return can_switch;
}
int
nouveau_card_init(struct drm_device *dev)
{
@ -384,6 +409,8 @@ nouveau_card_init(struct drm_device *dev)
return 0;
vga_client_register(dev->pdev, dev, NULL, nouveau_vga_set_decode);
vga_switcheroo_register_client(dev->pdev, nouveau_switcheroo_set_state,
nouveau_switcheroo_can_switch);
/* Initialise internal driver API hooks */
ret = nouveau_init_engine_ptrs(dev);
@ -617,11 +644,6 @@ int nouveau_load(struct drm_device *dev, unsigned long flags)
NV_DEBUG(dev, "vendor: 0x%X device: 0x%X class: 0x%X\n",
dev->pci_vendor, dev->pci_device, dev->pdev->class);
dev_priv->acpi_dsm = nouveau_dsm_probe(dev);
if (dev_priv->acpi_dsm)
nouveau_hybrid_setup(dev);
dev_priv->wq = create_workqueue("nouveau");
if (!dev_priv->wq)
return -EINVAL;

3
drivers/gpu/drm/radeon/Makefile
View File

@ -54,7 +54,8 @@ radeon-y += radeon_device.o radeon_kms.o \
radeon_cs.o radeon_bios.o radeon_benchmark.o r100.o r300.o r420.o \
rs400.o rs600.o rs690.o rv515.o r520.o r600.o rv770.o radeon_test.o \
r200.o radeon_legacy_tv.o r600_cs.o r600_blit.o r600_blit_shaders.o \
r600_blit_kms.o radeon_pm.o atombios_dp.o r600_audio.o r600_hdmi.o
r600_blit_kms.o radeon_pm.o atombios_dp.o r600_audio.o r600_hdmi.o \
radeon_atpx_handler.o
radeon-$(CONFIG_COMPAT) += radeon_ioc32.o

8
drivers/gpu/drm/radeon/radeon.h
View File

@ -118,6 +118,10 @@ struct radeon_device;
/*
* BIOS.
*/
#define ATRM_BIOS_PAGE 4096
bool radeon_atrm_supported(struct pci_dev *pdev);
int radeon_atrm_get_bios_chunk(uint8_t *bios, int offset, int len);
bool radeon_get_bios(struct radeon_device *rdev);
@ -838,6 +842,8 @@ struct radeon_device {
int audio_bits_per_sample;
uint8_t audio_status_bits;
uint8_t audio_category_code;
bool powered_down;
};
int radeon_device_init(struct radeon_device *rdev,
@ -1042,6 +1048,8 @@ extern void radeon_legacy_set_clock_gating(struct radeon_device *rdev, int enabl
extern void radeon_atom_set_clock_gating(struct radeon_device *rdev, int enable);
extern void radeon_ttm_placement_from_domain(struct radeon_bo *rbo, u32 domain);
extern bool radeon_ttm_bo_is_radeon_bo(struct ttm_buffer_object *bo);
extern int radeon_resume_kms(struct drm_device *dev);
extern int radeon_suspend_kms(struct drm_device *dev, pm_message_t state);
/* r100,rv100,rs100,rv200,rs200,r200,rv250,rs300,rv280 */
struct r100_mc_save {

258
drivers/gpu/drm/radeon/radeon_atpx_handler.c Normal file
View File

@ -0,0 +1,258 @@
/*
* Copyright (c) 2010 Red Hat Inc.
* Author : Dave Airlie <airlied@redhat.com>
*
* Licensed under GPLv2
*
* ATPX support for both Intel/ATI
*/
#include <linux/vga_switcheroo.h>
#include <acpi/acpi.h>
#include <acpi/acpi_bus.h>
#include <linux/pci.h>
#define ATPX_VERSION 0
#define ATPX_GPU_PWR 2
#define ATPX_MUX_SELECT 3
#define ATPX_INTEGRATED 0
#define ATPX_DISCRETE 1
#define ATPX_MUX_IGD 0
#define ATPX_MUX_DISCRETE 1
static struct radeon_atpx_priv {
bool atpx_detected;
/* handle for device - and atpx */
acpi_handle dhandle;
acpi_handle atpx_handle;
acpi_handle atrm_handle;
} radeon_atpx_priv;
/* retrieve the ROM in 4k blocks */
static int radeon_atrm_call(acpi_handle atrm_handle, uint8_t *bios,
int offset, int len)
{
acpi_status status;
union acpi_object atrm_arg_elements[2], *obj;
struct acpi_object_list atrm_arg;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
atrm_arg.count = 2;
atrm_arg.pointer = &atrm_arg_elements[0];
atrm_arg_elements[0].type = ACPI_TYPE_INTEGER;
atrm_arg_elements[0].integer.value = offset;
atrm_arg_elements[1].type = ACPI_TYPE_INTEGER;
atrm_arg_elements[1].integer.value = len;
status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer);
if (ACPI_FAILURE(status)) {
printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status));
return -ENODEV;
}
obj = (union acpi_object *)buffer.pointer;
memcpy(bios+offset, obj->buffer.pointer, len);
kfree(buffer.pointer);
return len;
}
bool radeon_atrm_supported(struct pci_dev *pdev)
{
/* get the discrete ROM only via ATRM */
if (!radeon_atpx_priv.atpx_detected)
return false;
if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev))
return false;
return true;
}
int radeon_atrm_get_bios_chunk(uint8_t *bios, int offset, int len)
{
return radeon_atrm_call(radeon_atpx_priv.atrm_handle, bios, offset, len);
}
static int radeon_atpx_get_version(acpi_handle handle)
{
acpi_status status;
union acpi_object atpx_arg_elements[2], *obj;
struct acpi_object_list atpx_arg;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
atpx_arg.count = 2;
atpx_arg.pointer = &atpx_arg_elements[0];
atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
atpx_arg_elements[0].integer.value = ATPX_VERSION;
atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;
atpx_arg_elements[1].integer.value = ATPX_VERSION;
status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
if (ACPI_FAILURE(status)) {
printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status));
return -ENOSYS;
}
obj = (union acpi_object *)buffer.pointer;
if (obj && (obj->type == ACPI_TYPE_BUFFER))
printk(KERN_INFO "radeon atpx: version is %d\n", *((u8 *)(obj->buffer.pointer) + 2));
kfree(buffer.pointer);
return 0;
}
static int radeon_atpx_execute(acpi_handle handle, int cmd_id, u16 value)
{
acpi_status status;
union acpi_object atpx_arg_elements[2];
struct acpi_object_list atpx_arg;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
uint8_t buf[4] = {0};
if (!handle)
return -EINVAL;
atpx_arg.count = 2;
atpx_arg.pointer = &atpx_arg_elements[0];
atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
atpx_arg_elements[0].integer.value = cmd_id;
buf[2] = value & 0xff;
buf[3] = (value >> 8) & 0xff;
atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;
atpx_arg_elements[1].buffer.length = 4;
atpx_arg_elements[1].buffer.pointer = buf;
status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
if (ACPI_FAILURE(status)) {
printk("%s: failed to call ATPX: %s\n", __func__, acpi_format_exception(status));
return -ENOSYS;
}
kfree(buffer.pointer);
return 0;
}
static int radeon_atpx_set_discrete_state(acpi_handle handle, int state)
{
return radeon_atpx_execute(handle, ATPX_GPU_PWR, state);
}
static int radeon_atpx_switch_mux(acpi_handle handle, int mux_id)
{
return radeon_atpx_execute(handle, ATPX_MUX_SELECT, mux_id);
}
static int radeon_atpx_switchto(enum vga_switcheroo_client_id id)
{
if (id == VGA_SWITCHEROO_IGD)
radeon_atpx_switch_mux(radeon_atpx_priv.atpx_handle, 0);
else
radeon_atpx_switch_mux(radeon_atpx_priv.atpx_handle, 1);
return 0;
}
static int radeon_atpx_power_state(enum vga_switcheroo_client_id id,
enum vga_switcheroo_state state)
{
/* on w500 ACPI can't change intel gpu state */
if (id == VGA_SWITCHEROO_IGD)
return 0;
radeon_atpx_set_discrete_state(radeon_atpx_priv.atpx_handle, state);
return 0;
}
static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
{
acpi_handle dhandle, atpx_handle, atrm_handle;
acpi_status status;
dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
if (!dhandle)
return false;
status = acpi_get_handle(dhandle, "ATPX", &atpx_handle);
if (ACPI_FAILURE(status))
return false;
status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
if (ACPI_FAILURE(status))
return false;
radeon_atpx_priv.dhandle = dhandle;
radeon_atpx_priv.atpx_handle = atpx_handle;
radeon_atpx_priv.atrm_handle = atrm_handle;
return true;
}
static int radeon_atpx_init(void)
{
/* set up the ATPX handle */
radeon_atpx_get_version(radeon_atpx_priv.atpx_handle);
return 0;
}
static int radeon_atpx_get_client_id(struct pci_dev *pdev)
{
if (radeon_atpx_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev))
return VGA_SWITCHEROO_IGD;
else
return VGA_SWITCHEROO_DIS;
}
static struct vga_switcheroo_handler radeon_atpx_handler = {
.switchto = radeon_atpx_switchto,
.power_state = radeon_atpx_power_state,
.init = radeon_atpx_init,
.get_client_id = radeon_atpx_get_client_id,
};
static bool radeon_atpx_detect(void)
{
char acpi_method_name[255] = { 0 };
struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
struct pci_dev *pdev = NULL;
bool has_atpx = false;
int vga_count = 0;
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
vga_count++;
has_atpx |= (radeon_atpx_pci_probe_handle(pdev) == true);
}
if (has_atpx && vga_count == 2) {
acpi_get_name(radeon_atpx_priv.atpx_handle, ACPI_FULL_PATHNAME, &buffer);
printk(KERN_INFO "VGA switcheroo: detected switching method %s handle\n",
acpi_method_name);
radeon_atpx_priv.atpx_detected = true;
return true;
}
return false;
}
void radeon_register_atpx_handler(void)
{
bool r;
/* detect if we have any ATPX + 2 VGA in the system */
r = radeon_atpx_detect();
if (!r)
return;
vga_switcheroo_register_handler(&radeon_atpx_handler);
}
void radeon_unregister_atpx_handler(void)
{
vga_switcheroo_unregister_handler();
}

44
drivers/gpu/drm/radeon/radeon_bios.c
View File

@ -30,6 +30,7 @@
#include "radeon.h"
#include "atom.h"
#include <linux/vga_switcheroo.h>
/*
* BIOS.
*/
@ -62,7 +63,7 @@ static bool igp_read_bios_from_vram(struct radeon_device *rdev)
iounmap(bios);
return false;
}
memcpy(rdev->bios, bios, size);
memcpy_fromio(rdev->bios, bios, size);
iounmap(bios);
return true;
}
@ -93,6 +94,38 @@ static bool radeon_read_bios(struct radeon_device *rdev)
return true;
}
/* ATRM is used to get the BIOS on the discrete cards in
* dual-gpu systems.
*/
static bool radeon_atrm_get_bios(struct radeon_device *rdev)
{
int ret;
int size = 64 * 1024;
int i;
if (!radeon_atrm_supported(rdev->pdev))
return false;
rdev->bios = kmalloc(size, GFP_KERNEL);
if (!rdev->bios) {
DRM_ERROR("Unable to allocate bios\n");
return false;
}
for (i = 0; i < size / ATRM_BIOS_PAGE; i++) {
ret = radeon_atrm_get_bios_chunk(rdev->bios,
(i * ATRM_BIOS_PAGE),
ATRM_BIOS_PAGE);
if (ret <= 0)
break;
}
if (i == 0 || rdev->bios[0] != 0x55 || rdev->bios[1] != 0xaa) {
kfree(rdev->bios);
return false;
}
return true;
}
static bool r700_read_disabled_bios(struct radeon_device *rdev)
{
uint32_t viph_control;
@ -388,16 +421,16 @@ static bool radeon_read_disabled_bios(struct radeon_device *rdev)
return legacy_read_disabled_bios(rdev);
}
bool radeon_get_bios(struct radeon_device *rdev)
{
bool r;
uint16_t tmp;
if (rdev->flags & RADEON_IS_IGP) {
r = radeon_atrm_get_bios(rdev);
if (r == false)
r = igp_read_bios_from_vram(rdev);
if (r == false)
r = radeon_read_bios(rdev);
} else
if (r == false)
r = radeon_read_bios(rdev);
if (r == false) {
r = radeon_read_disabled_bios(rdev);
@ -408,6 +441,7 @@ bool radeon_get_bios(struct radeon_device *rdev)
return false;
}
if (rdev->bios[0] != 0x55 || rdev->bios[1] != 0xaa) {
printk("BIOS signature incorrect %x %x\n", rdev->bios[0], rdev->bios[1]);
goto free_bios;
}

40
drivers/gpu/drm/radeon/radeon_device.c
View File

@ -30,6 +30,7 @@
#include <drm/drm_crtc_helper.h>
#include <drm/radeon_drm.h>
#include <linux/vgaarb.h>
#include <linux/vga_switcheroo.h>
#include "radeon_reg.h"
#include "radeon.h"
#include "radeon_asic.h"
@ -613,6 +614,36 @@ void radeon_check_arguments(struct radeon_device *rdev)
}
}
static void radeon_switcheroo_set_state(struct pci_dev *pdev, enum vga_switcheroo_state state)
{
struct drm_device *dev = pci_get_drvdata(pdev);
struct radeon_device *rdev = dev->dev_private;
pm_message_t pmm = { .event = PM_EVENT_SUSPEND };
if (state == VGA_SWITCHEROO_ON) {
printk(KERN_INFO "radeon: switched on\n");
/* don't suspend or resume card normally */
rdev->powered_down = false;
radeon_resume_kms(dev);
} else {
printk(KERN_INFO "radeon: switched off\n");
radeon_suspend_kms(dev, pmm);
/* don't suspend or resume card normally */
rdev->powered_down = true;
}
}
static bool radeon_switcheroo_can_switch(struct pci_dev *pdev)
{
struct drm_device *dev = pci_get_drvdata(pdev);
bool can_switch;
spin_lock(&dev->count_lock);
can_switch = (dev->open_count == 0);
spin_unlock(&dev->count_lock);
return can_switch;
}
int radeon_device_init(struct radeon_device *rdev,
struct drm_device *ddev,
struct pci_dev *pdev,
@ -692,6 +723,9 @@ int radeon_device_init(struct radeon_device *rdev,
/* this will fail for cards that aren't VGA class devices, just
* ignore it */
vga_client_register(rdev->pdev, rdev, NULL, radeon_vga_set_decode);
vga_switcheroo_register_client(rdev->pdev,
radeon_switcheroo_set_state,
radeon_switcheroo_can_switch);
r = radeon_init(rdev);
if (r)
@ -723,6 +757,7 @@ void radeon_device_fini(struct radeon_device *rdev)
rdev->shutdown = true;
radeon_fini(rdev);
destroy_workqueue(rdev->wq);
vga_switcheroo_unregister_client(rdev->pdev);
vga_client_register(rdev->pdev, NULL, NULL, NULL);
iounmap(rdev->rmmio);
rdev->rmmio = NULL;
@ -746,6 +781,8 @@ int radeon_suspend_kms(struct drm_device *dev, pm_message_t state)
}
rdev = dev->dev_private;
if (rdev->powered_down)
return 0;
/* unpin the front buffers */
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
struct radeon_framebuffer *rfb = to_radeon_framebuffer(crtc->fb);
@ -791,6 +828,9 @@ int radeon_resume_kms(struct drm_device *dev)
{
struct radeon_device *rdev = dev->dev_private;
if (rdev->powered_down)
return 0;
acquire_console_sem();
pci_set_power_state(dev->pdev, PCI_D0);
pci_restore_state(dev->pdev);

2
drivers/gpu/drm/radeon/radeon_drv.c
View File

@ -339,6 +339,7 @@ static int __init radeon_init(void)
driver = &kms_driver;
driver->driver_features |= DRIVER_MODESET;
driver->num_ioctls = radeon_max_kms_ioctl;
radeon_register_atpx_handler();
}
/* if the vga console setting is enabled still
* let modprobe override it */
@ -348,6 +349,7 @@ static int __init radeon_init(void)
static void __exit radeon_exit(void)
{
drm_exit(driver);
radeon_unregister_atpx_handler();
}
module_init(radeon_init);

3
drivers/gpu/drm/radeon/radeon_drv.h
View File

@ -455,6 +455,9 @@ extern void r600_blit_swap(struct drm_device *dev,
int sx, int sy, int dx, int dy,
int w, int h, int src_pitch, int dst_pitch, int cpp);
/* atpx handler */
void radeon_register_atpx_handler(void);
void radeon_unregister_atpx_handler(void);
/* Flags for stats.boxes
*/
#define RADEON_BOX_DMA_IDLE 0x1

3
drivers/gpu/drm/radeon/radeon_fb.c
View File

@ -39,6 +39,8 @@
#include "drm_fb_helper.h"
#include <linux/vga_switcheroo.h>
struct radeon_fb_device {
struct drm_fb_helper helper;
struct radeon_framebuffer *rfb;
@ -291,6 +293,7 @@ int radeonfb_create(struct drm_device *dev,
rfbdev->rdev = rdev;
mutex_unlock(&rdev->ddev->struct_mutex);
vga_switcheroo_client_fb_set(rdev->ddev->pdev, info);
return 0;
out_unref:

3
drivers/gpu/drm/radeon/radeon_kms.c
View File

@ -30,6 +30,8 @@
#include "radeon.h"
#include "radeon_drm.h"
#include <linux/vga_switcheroo.h>
int radeon_driver_unload_kms(struct drm_device *dev)
{
struct radeon_device *rdev = dev->dev_private;
@ -136,6 +138,7 @@ int radeon_driver_firstopen_kms(struct drm_device *dev)
void radeon_driver_lastclose_kms(struct drm_device *dev)
{
vga_switcheroo_process_delayed_switch();
}
int radeon_driver_open_kms(struct drm_device *dev, struct drm_file *file_priv)

13
drivers/gpu/vga/Kconfig
View File

@ -8,3 +8,16 @@ config VGA_ARB
are accessed at same time they need some kind of coordination. Please
see Documentation/vgaarbiter.txt for more details. Select this to
enable VGA arbiter.
config VGA_SWITCHEROO
bool "Laptop Hybrid Grapics - GPU switching support"
default y
depends on X86
depends on ACPI
help
Many laptops released in 2008/9/10 have two gpus with a multiplxer
to switch between them. This adds support for dynamic switching when
X isn't running and delayed switching until the next logoff. This
features is called hybrid graphics, ATI PowerXpress, and Nvidia
HybridPower.

1
drivers/gpu/vga/Makefile
View File

@ -1 +1,2 @@
obj-$(CONFIG_VGA_ARB) += vgaarb.o
obj-$(CONFIG_VGA_SWITCHEROO) += vga_switcheroo.o

453
drivers/gpu/vga/vga_switcheroo.c Normal file
View File

@ -0,0 +1,453 @@
/*
* Copyright (c) 2010 Red Hat Inc.
* Author : Dave Airlie <airlied@redhat.com>
*
*
* Licensed under GPLv2
*
* vga_switcheroo.c - Support for laptop with dual GPU using one set of outputs
Switcher interface - methods require for ATPX and DCM
- switchto - this throws the output MUX switch
- discrete_set_power - sets the power state for the discrete card
GPU driver interface
- set_gpu_state - this should do the equiv of s/r for the card
- this should *not* set the discrete power state
- switch_check - check if the device is in a position to switch now
*/
#include <linux/module.h>
#include <linux/dmi.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/fs.h>
#include <linux/debugfs.h>
#include <linux/fb.h>
#include <acpi/acpi.h>
#include <acpi/acpi_bus.h>
#include <linux/pci.h>
#include <linux/vga_switcheroo.h>
struct vga_switcheroo_client {
struct pci_dev *pdev;
struct fb_info *fb_info;
int pwr_state;
void (*set_gpu_state)(struct pci_dev *pdev, enum vga_switcheroo_state);
bool (*can_switch)(struct pci_dev *pdev);
int id;
bool active;
};
static DEFINE_MUTEX(vgasr_mutex);
struct vgasr_priv {
bool active;
bool delayed_switch_active;
enum vga_switcheroo_client_id delayed_client_id;
struct dentry *debugfs_root;
struct dentry *switch_file;
int registered_clients;
struct vga_switcheroo_client clients[VGA_SWITCHEROO_MAX_CLIENTS];
struct vga_switcheroo_handler *handler;
};
static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv);
static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv);
/* only one switcheroo per system */
static struct vgasr_priv vgasr_priv;
int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler)
{
mutex_lock(&vgasr_mutex);
if (vgasr_priv.handler) {
mutex_unlock(&vgasr_mutex);
return -EINVAL;
}
vgasr_priv.handler = handler;
mutex_unlock(&vgasr_mutex);
return 0;
}
EXPORT_SYMBOL(vga_switcheroo_register_handler);
void vga_switcheroo_unregister_handler(void)
{
mutex_lock(&vgasr_mutex);
vgasr_priv.handler = NULL;
mutex_unlock(&vgasr_mutex);
}
EXPORT_SYMBOL(vga_switcheroo_unregister_handler);
static void vga_switcheroo_enable(void)
{
int i;
int ret;
/* call the handler to init */
vgasr_priv.handler->init();
for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
ret = vgasr_priv.handler->get_client_id(vgasr_priv.clients[i].pdev);
if (ret < 0)
return;
vgasr_priv.clients[i].id = ret;
}
vga_switcheroo_debugfs_init(&vgasr_priv);
vgasr_priv.active = true;
}
int vga_switcheroo_register_client(struct pci_dev *pdev,
void (*set_gpu_state)(struct pci_dev *pdev, enum vga_switcheroo_state),
bool (*can_switch)(struct pci_dev *pdev))
{
int index;
mutex_lock(&vgasr_mutex);
/* don't do IGD vs DIS here */
if (vgasr_priv.registered_clients & 1)
index = 1;
else
index = 0;
vgasr_priv.clients[index].pwr_state = VGA_SWITCHEROO_ON;
vgasr_priv.clients[index].pdev = pdev;
vgasr_priv.clients[index].set_gpu_state = set_gpu_state;
vgasr_priv.clients[index].can_switch = can_switch;
vgasr_priv.clients[index].id = -1;
if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
vgasr_priv.clients[index].active = true;
vgasr_priv.registered_clients |= (1 << index);
/* if we get two clients + handler */
if (vgasr_priv.registered_clients == 0x3 && vgasr_priv.handler) {
printk(KERN_INFO "vga_switcheroo: enabled\n");
vga_switcheroo_enable();
}
mutex_unlock(&vgasr_mutex);
return 0;
}
EXPORT_SYMBOL(vga_switcheroo_register_client);
void vga_switcheroo_unregister_client(struct pci_dev *pdev)
{
int i;
mutex_lock(&vgasr_mutex);
for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
if (vgasr_priv.clients[i].pdev == pdev) {
vgasr_priv.registered_clients &= ~(1 << i);
break;
}
}
printk(KERN_INFO "vga_switcheroo: disabled\n");
vga_switcheroo_debugfs_fini(&vgasr_priv);
vgasr_priv.active = false;
mutex_unlock(&vgasr_mutex);
}
EXPORT_SYMBOL(vga_switcheroo_unregister_client);
void vga_switcheroo_client_fb_set(struct pci_dev *pdev,
struct fb_info *info)
{
int i;
mutex_lock(&vgasr_mutex);
for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
if (vgasr_priv.clients[i].pdev == pdev) {
vgasr_priv.clients[i].fb_info = info;
break;
}
}
mutex_unlock(&vgasr_mutex);
}
EXPORT_SYMBOL(vga_switcheroo_client_fb_set);
static int vga_switcheroo_show(struct seq_file *m, void *v)
{
int i;
mutex_lock(&vgasr_mutex);
for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
seq_printf(m, "%d:%c:%s:%s\n", i,
vgasr_priv.clients[i].active ? '+' : ' ',
vgasr_priv.clients[i].pwr_state ? "Pwr" : "Off",
pci_name(vgasr_priv.clients[i].pdev));
}
mutex_unlock(&vgasr_mutex);
return 0;
}
static int vga_switcheroo_debugfs_open(struct inode *inode, struct file *file)
{
return single_open(file, vga_switcheroo_show, NULL);
}
static int vga_switchon(struct vga_switcheroo_client *client)
{
int ret;
ret = vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_ON);
/* call the driver callback to turn on device */
client->set_gpu_state(client->pdev, VGA_SWITCHEROO_ON);
client->pwr_state = VGA_SWITCHEROO_ON;
return 0;
}
static int vga_switchoff(struct vga_switcheroo_client *client)
{
/* call the driver callback to turn off device */
client->set_gpu_state(client->pdev, VGA_SWITCHEROO_OFF);
vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_OFF);
client->pwr_state = VGA_SWITCHEROO_OFF;
return 0;
}
static int vga_switchto(struct vga_switcheroo_client *new_client)
{
int ret;
int i;
struct vga_switcheroo_client *active = NULL;
if (new_client->active == true)
return 0;
for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
if (vgasr_priv.clients[i].active == true) {
active = &vgasr_priv.clients[i];
break;
}
}
if (!active)
return 0;
/* power up the first device */
ret = pci_enable_device(new_client->pdev);
if (ret)
return ret;
if (new_client->pwr_state == VGA_SWITCHEROO_OFF)
vga_switchon(new_client);
/* swap shadow resource to denote boot VGA device has changed so X starts on new device */
active->active = false;
active->pdev->resource[PCI_ROM_RESOURCE].flags &= ~IORESOURCE_ROM_SHADOW;
new_client->pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW;
if (new_client->fb_info) {
struct fb_event event;
event.info = new_client->fb_info;
fb_notifier_call_chain(FB_EVENT_REMAP_ALL_CONSOLE, &event);
}
ret = vgasr_priv.handler->switchto(new_client->id);
if (ret)
return ret;
if (active->pwr_state == VGA_SWITCHEROO_ON)
vga_switchoff(active);
new_client->active = true;
return 0;
}
static ssize_t
vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
{
char usercmd[64];
const char *pdev_name;
int i, ret;
bool delay = false, can_switch;
int client_id = -1;
struct vga_switcheroo_client *client = NULL;
if (cnt > 63)
cnt = 63;
if (copy_from_user(usercmd, ubuf, cnt))
return -EFAULT;
mutex_lock(&vgasr_mutex);
if (!vgasr_priv.active)
return -EINVAL;
/* pwr off the device not in use */
if (strncmp(usercmd, "OFF", 3) == 0) {
for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
if (vgasr_priv.clients[i].active)
continue;
if (vgasr_priv.clients[i].pwr_state == VGA_SWITCHEROO_ON)
vga_switchoff(&vgasr_priv.clients[i]);
}
goto out;
}
/* pwr on the device not in use */
if (strncmp(usercmd, "ON", 2) == 0) {
for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
if (vgasr_priv.clients[i].active)
continue;
if (vgasr_priv.clients[i].pwr_state == VGA_SWITCHEROO_OFF)
vga_switchon(&vgasr_priv.clients[i]);
}
goto out;
}
/* request a delayed switch - test can we switch now */
if (strncmp(usercmd, "DIGD", 4) == 0) {
client_id = VGA_SWITCHEROO_IGD;
delay = true;
}
if (strncmp(usercmd, "DDIS", 4) == 0) {
client_id = VGA_SWITCHEROO_DIS;
delay = true;
}
if (strncmp(usercmd, "IGD", 3) == 0)
client_id = VGA_SWITCHEROO_IGD;
if (strncmp(usercmd, "DIS", 3) == 0)
client_id = VGA_SWITCHEROO_DIS;
if (client_id == -1)
goto out;
for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
if (vgasr_priv.clients[i].id == client_id) {
client = &vgasr_priv.clients[i];
break;
}
}
vgasr_priv.delayed_switch_active = false;
/* okay we want a switch - test if devices are willing to switch */
can_switch = true;
for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
can_switch = vgasr_priv.clients[i].can_switch(vgasr_priv.clients[i].pdev);
if (can_switch == false) {
printk(KERN_ERR "vga_switcheroo: client %d refused switch\n", i);
break;
}
}
if (can_switch == false && delay == false)
goto out;
if (can_switch == true) {
pdev_name = pci_name(client->pdev);
ret = vga_switchto(client);
if (ret)
printk(KERN_ERR "vga_switcheroo: switching failed %d\n", ret);
} else {
printk(KERN_INFO "vga_switcheroo: setting delayed switch to client %d\n", client->id);
vgasr_priv.delayed_switch_active = true;
vgasr_priv.delayed_client_id = client_id;
/* we should at least power up the card to
make the switch faster */
if (client->pwr_state == VGA_SWITCHEROO_OFF)
vga_switchon(client);
}
out:
mutex_unlock(&vgasr_mutex);
return cnt;
}
static const struct file_operations vga_switcheroo_debugfs_fops = {
.owner = THIS_MODULE,
.open = vga_switcheroo_debugfs_open,
.write = vga_switcheroo_debugfs_write,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv)
{
if (priv->switch_file) {
debugfs_remove(priv->switch_file);
priv->switch_file = NULL;
}
if (priv->debugfs_root) {
debugfs_remove(priv->debugfs_root);
priv->debugfs_root = NULL;
}
}
static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv)
{
/* already initialised */
if (priv->debugfs_root)
return 0;
priv->debugfs_root = debugfs_create_dir("vgaswitcheroo", NULL);
if (!priv->debugfs_root) {
printk(KERN_ERR "vga_switcheroo: Cannot create /sys/kernel/debug/vgaswitcheroo\n");
goto fail;
}
priv->switch_file = debugfs_create_file("switch", 0644,
priv->debugfs_root, NULL, &vga_switcheroo_debugfs_fops);
if (!priv->switch_file) {
printk(KERN_ERR "vga_switcheroo: cannot create /sys/kernel/debug/vgaswitcheroo/switch\n");
goto fail;
}
return 0;
fail:
vga_switcheroo_debugfs_fini(priv);
return -1;
}
int vga_switcheroo_process_delayed_switch(void)
{
struct vga_switcheroo_client *client = NULL;
const char *pdev_name;
bool can_switch = true;
int i;
int ret;
int err = -EINVAL;
mutex_lock(&vgasr_mutex);
if (!vgasr_priv.delayed_switch_active)
goto err;
printk(KERN_INFO "vga_switcheroo: processing delayed switch to %d\n", vgasr_priv.delayed_client_id);
for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {
if (vgasr_priv.clients[i].id == vgasr_priv.delayed_client_id)
client = &vgasr_priv.clients[i];
can_switch = vgasr_priv.clients[i].can_switch(vgasr_priv.clients[i].pdev);
if (can_switch == false) {
printk(KERN_ERR "vga_switcheroo: client %d refused switch\n", i);
break;
}
}
if (can_switch == false || client == NULL)
goto err;
pdev_name = pci_name(client->pdev);
ret = vga_switchto(client);
if (ret)
printk(KERN_ERR "vga_switcheroo: delayed switching failed %d\n", ret);
vgasr_priv.delayed_switch_active = false;
err = 0;
err:
mutex_unlock(&vgasr_mutex);
return err;
}
EXPORT_SYMBOL(vga_switcheroo_process_delayed_switch);

18
drivers/video/console/fbcon.c
View File

@ -3025,6 +3025,20 @@ static int fbcon_fb_unregistered(struct fb_info *info)
return 0;
}
static void fbcon_remap_all(int idx)
{
int i;
for (i = first_fb_vc; i <= last_fb_vc; i++)
set_con2fb_map(i, idx, 0);
if (con_is_bound(&fb_con)) {
printk(KERN_INFO "fbcon: Remapping primary device, "
"fb%i, to tty %i-%i\n", idx,
first_fb_vc + 1, last_fb_vc + 1);
info_idx = idx;
}
}
#ifdef CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY
static void fbcon_select_primary(struct fb_info *info)
{
@ -3225,6 +3239,10 @@ static int fbcon_event_notify(struct notifier_block *self,
caps = event->data;
fbcon_get_requirement(info, caps);
break;
case FB_EVENT_REMAP_ALL_CONSOLE:
idx = info->node;
fbcon_remap_all(idx);
break;
}
done:
return ret;

2
include/linux/fb.h
View File

@ -543,6 +543,8 @@ struct fb_cursor_user {
#define FB_EVENT_GET_REQ 0x0D
/* Unbind from the console if possible */
#define FB_EVENT_FB_UNBIND 0x0E
/* CONSOLE-SPECIFIC: remap all consoles to new fb - for vga switcheroo */
#define FB_EVENT_REMAP_ALL_CONSOLE 0x0F
struct fb_event {
struct fb_info *info;

58
include/linux/vga_switcheroo.h Normal file
View File

@ -0,0 +1,58 @@
/*
* Copyright (c) 2010 Red Hat Inc.
* Author : Dave Airlie <airlied@redhat.com>
*
* Licensed under GPLv2
*
* vga_switcheroo.h - Support for laptop with dual GPU using one set of outputs
*/
#include <acpi/acpi.h>
#include <linux/fb.h>
enum vga_switcheroo_state {
VGA_SWITCHEROO_OFF,
VGA_SWITCHEROO_ON,
};
enum vga_switcheroo_client_id {
VGA_SWITCHEROO_IGD,
VGA_SWITCHEROO_DIS,
VGA_SWITCHEROO_MAX_CLIENTS,
};
struct vga_switcheroo_handler {
int (*switchto)(enum vga_switcheroo_client_id id);
int (*power_state)(enum vga_switcheroo_client_id id,
enum vga_switcheroo_state state);
int (*init)(void);
int (*get_client_id)(struct pci_dev *pdev);
};
#if defined(CONFIG_VGA_SWITCHEROO)
void vga_switcheroo_unregister_client(struct pci_dev *dev);
int vga_switcheroo_register_client(struct pci_dev *dev,
void (*set_gpu_state)(struct pci_dev *dev, enum vga_switcheroo_state),
bool (*can_switch)(struct pci_dev *dev));
void vga_switcheroo_client_fb_set(struct pci_dev *dev,
struct fb_info *info);
int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler);
void vga_switcheroo_unregister_handler(void);
int vga_switcheroo_process_delayed_switch(void);
#else
static inline void vga_switcheroo_unregister_client(struct pci_dev *dev) {}
static inline int vga_switcheroo_register_client(struct pci_dev *dev,
void (*set_gpu_state)(struct pci_dev *dev, enum vga_switcheroo_state),
bool (*can_switch)(struct pci_dev *dev)) { return 0; }
static inline void vga_switcheroo_client_fb_set(struct pci_dev *dev, struct fb_info *info) {}
static inline int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler) { return 0; }
static inline void vga_switcheroo_unregister_handler(void) {}
static inline int vga_switcheroo_process_delayed_switch(void) { return 0; }
#endif