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Subject[PATCH 3/3] drm: add support to drm for VGA arbitration.
Date
From: Dave Airlie <airlied@redhat.com>

This adds 3 things to the drm,

for non-modesetting drivers, it adds an irq hook
for the vga arb to disable/enable irqs around vga arb times.

radeon/kms: adds support to disable VGA decoding on r100->r500 under KMS
intel/kms: add support to disable VGA decoding on hopefully all Intel GPUs

Signed-off-by: Dave Airlie <airlied@redhat.com>
Acked-by: Tiago Vignatti <tiago.vignatti@nokia.com>
---
drivers/gpu/drm/drm_irq.c | 24 ++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_dma.c | 6 ++++++
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_display.c | 17 +++++++++++++++++
drivers/gpu/drm/i915/intel_drv.h | 1 +
drivers/gpu/drm/radeon/r100.c | 9 +++++++++
drivers/gpu/drm/radeon/radeon.h | 2 ++
drivers/gpu/drm/radeon/radeon_asic.h | 9 +++++++++
drivers/gpu/drm/radeon/radeon_device.c | 5 ++++-
include/drm/drmP.h | 3 +++
10 files changed, 76 insertions(+), 1 deletions(-)
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index b4a3dbc..436889e 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -37,6 +37,7 @@

#include <linux/interrupt.h> /* For task queue support */

+#include <linux/vgaarb.h>
/**
* Get interrupt from bus id.
*
@@ -171,6 +172,23 @@ err:
}
EXPORT_SYMBOL(drm_vblank_init);

+static void drm_irq_vgaarb_nokms(void *cookie, bool state)
+{
+ struct drm_device *dev = cookie;
+
+ if (dev->driver->vgaarb_irq) {
+ dev->driver->vgaarb_irq(dev, state);
+ return;
+ }
+
+ if (state)
+ dev->driver->irq_uninstall(dev);
+ else {
+ dev->driver->irq_preinstall(dev);
+ dev->driver->irq_postinstall(dev);
+ }
+}
+
/**
* Install IRQ handler.
*
@@ -231,6 +249,9 @@ int drm_irq_install(struct drm_device *dev)
return ret;
}

+ if (!drm_core_check_feature(dev, DRIVER_MODESET))
+ vga_set_irq_callback(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms);
+
/* After installing handler */
ret = dev->driver->irq_postinstall(dev);
if (ret < 0) {
@@ -279,6 +300,9 @@ int drm_irq_uninstall(struct drm_device * dev)

DRM_DEBUG("irq=%d\n", dev->pdev->irq);

+ if (!drm_core_check_feature(dev, DRIVER_MODESET))
+ vga_set_irq_callback(dev->pdev, NULL, NULL);
+
dev->driver->irq_uninstall(dev);

free_irq(dev->pdev->irq, dev);
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 8c47831..391e496 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -33,6 +33,7 @@
#include "i915_drm.h"
#include "i915_drv.h"

+#include <linux/vgaarb.h>
#define I915_DRV "i915_drv"

/* Really want an OS-independent resettable timer. Would like to have
@@ -1029,6 +1030,11 @@ static int i915_load_modeset_init(struct drm_device *dev,
if (ret)
DRM_INFO("failed to find VBIOS tables\n");

+ /* tell the VGA arbiter to set off */
+ ret = intel_modeset_vga_disable(dev);
+ if (ret == 0)
+ vga_set_legacy_decoding(dev->pdev, VGA_RSRC_NONE);
+
ret = drm_irq_install(dev);
if (ret)
goto destroy_ringbuffer;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 6c08584..3e3145e 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -30,6 +30,7 @@
* fb aperture size and the amount of pre-reserved memory.
*/
#define INTEL_GMCH_CTRL 0x52
+#define INTEL_GMCH_VGA_DISABLE (1 << 1)
#define INTEL_GMCH_ENABLED 0x4
#define INTEL_GMCH_MEM_MASK 0x1
#define INTEL_GMCH_MEM_64M 0x1
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 508838e..ad7ef01 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3188,3 +3188,20 @@ struct drm_encoder *intel_best_encoder(struct drm_connector *connector)

return &intel_output->enc;
}
+
+int intel_modeset_vga_disable(struct drm_device *dev)
+{
+ struct pci_dev *bridge_dev;
+ u16 gmch_ctrl;
+
+ bridge_dev = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
+ if (!bridge_dev) {
+ DRM_ERROR("Can't disable VGA, no bridge\n");
+ return -1;
+ }
+
+ pci_read_config_word(bridge_dev, INTEL_GMCH_CTRL, &gmch_ctrl);
+ gmch_ctrl |= INTEL_GMCH_VGA_DISABLE;
+ pci_write_config_word(bridge_dev, INTEL_GMCH_CTRL, gmch_ctrl);
+ return 0;
+}
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 004541c..ab5be5b 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -154,4 +154,5 @@ extern int intel_framebuffer_create(struct drm_device *dev,
struct drm_mode_fb_cmd *mode_cmd,
struct drm_framebuffer **fb,
struct drm_gem_object *obj);
+extern int intel_modeset_vga_disable(struct drm_device *dev);
#endif /* __INTEL_DRV_H__ */
diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
index c550932..1fa6723 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -1256,6 +1256,15 @@ static void r100_vram_get_type(struct radeon_device *rdev)
}
}

+void r100_vga_disable(struct radeon_device *rdev)
+{
+ uint32_t temp;
+ temp = RREG32(RADEON_CONFIG_CNTL);
+ temp &= ~(1<<8);
+ temp |= (1<<9);
+ WREG32(RADEON_CONFIG_CNTL, temp);
+}
+
void r100_vram_info(struct radeon_device *rdev)
{
r100_vram_get_type(rdev);
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index d61f2fc..583bfb2 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -499,6 +499,7 @@ struct radeon_asic {
int (*init)(struct radeon_device *rdev);
void (*errata)(struct radeon_device *rdev);
void (*vram_info)(struct radeon_device *rdev);
+ void (*vga_disable)(struct radeon_device *rdev);
int (*gpu_reset)(struct radeon_device *rdev);
int (*mc_init)(struct radeon_device *rdev);
void (*mc_fini)(struct radeon_device *rdev);
@@ -773,6 +774,7 @@ static inline void radeon_ring_write(struct radeon_device *rdev, uint32_t v)
#define radeon_cs_parse(p) rdev->asic->cs_parse((p))
#define radeon_errata(rdev) (rdev)->asic->errata((rdev))
#define radeon_vram_info(rdev) (rdev)->asic->vram_info((rdev))
+#define radeon_vga_disable(rdev) (rdev)->asic->vga_disable((rdev))
#define radeon_gpu_reset(rdev) (rdev)->asic->gpu_reset((rdev))
#define radeon_mc_init(rdev) (rdev)->asic->mc_init((rdev))
#define radeon_mc_fini(rdev) (rdev)->asic->mc_fini((rdev))
diff --git a/drivers/gpu/drm/radeon/radeon_asic.h b/drivers/gpu/drm/radeon/radeon_asic.h
index e2e5673..4586819 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.h
+++ b/drivers/gpu/drm/radeon/radeon_asic.h
@@ -46,6 +46,7 @@ uint32_t r100_mm_rreg(struct radeon_device *rdev, uint32_t reg);
void r100_mm_wreg(struct radeon_device *rdev, uint32_t reg, uint32_t v);
void r100_errata(struct radeon_device *rdev);
void r100_vram_info(struct radeon_device *rdev);
+void r100_vga_disable(struct radeon_device *rdev);
int r100_gpu_reset(struct radeon_device *rdev);
int r100_mc_init(struct radeon_device *rdev);
void r100_mc_fini(struct radeon_device *rdev);
@@ -76,6 +77,7 @@ static struct radeon_asic r100_asic = {
.init = &r100_init,
.errata = &r100_errata,
.vram_info = &r100_vram_info,
+ .vga_disable = &r100_vga_disable,
.gpu_reset = &r100_gpu_reset,
.mc_init = &r100_mc_init,
.mc_fini = &r100_mc_fini,
@@ -132,6 +134,7 @@ static struct radeon_asic r300_asic = {
.init = &r300_init,
.errata = &r300_errata,
.vram_info = &r300_vram_info,
+ .vga_disable = &r100_vga_disable,
.gpu_reset = &r300_gpu_reset,
.mc_init = &r300_mc_init,
.mc_fini = &r300_mc_fini,
@@ -169,6 +172,7 @@ static struct radeon_asic r420_asic = {
.init = &r300_init,
.errata = &r420_errata,
.vram_info = &r420_vram_info,
+ .vga_disable = &r100_vga_disable,
.gpu_reset = &r300_gpu_reset,
.mc_init = &r420_mc_init,
.mc_fini = &r420_mc_fini,
@@ -213,6 +217,7 @@ static struct radeon_asic rs400_asic = {
.init = &r300_init,
.errata = &rs400_errata,
.vram_info = &rs400_vram_info,
+ .vga_disable = &r100_vga_disable,
.gpu_reset = &r300_gpu_reset,
.mc_init = &rs400_mc_init,
.mc_fini = &rs400_mc_fini,
@@ -258,6 +263,7 @@ static struct radeon_asic rs600_asic = {
.init = &r300_init,
.errata = &rs600_errata,
.vram_info = &rs600_vram_info,
+ .vga_disable = &r100_vga_disable,
.gpu_reset = &r300_gpu_reset,
.mc_init = &rs600_mc_init,
.mc_fini = &rs600_mc_fini,
@@ -298,6 +304,7 @@ static struct radeon_asic rs690_asic = {
.init = &r300_init,
.errata = &rs690_errata,
.vram_info = &rs690_vram_info,
+ .vga_disable = &r100_vga_disable,
.gpu_reset = &r300_gpu_reset,
.mc_init = &rs690_mc_init,
.mc_fini = &rs690_mc_fini,
@@ -343,6 +350,7 @@ static struct radeon_asic rv515_asic = {
.init = &rv515_init,
.errata = &rv515_errata,
.vram_info = &rv515_vram_info,
+ .vga_disable = &r100_vga_disable,
.gpu_reset = &rv515_gpu_reset,
.mc_init = &rv515_mc_init,
.mc_fini = &rv515_mc_fini,
@@ -381,6 +389,7 @@ static struct radeon_asic r520_asic = {
.init = &rv515_init,
.errata = &r520_errata,
.vram_info = &r520_vram_info,
+ .vga_disable = &r100_vga_disable,
.gpu_reset = &rv515_gpu_reset,
.mc_init = &r520_mc_init,
.mc_fini = &r520_mc_fini,
diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index f97563d..c02f655 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -29,6 +29,7 @@
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/radeon_drm.h>
+#include <linux/vgaarb.h>
#include "radeon_reg.h"
#include "radeon.h"
#include "radeon_asic.h"
@@ -516,7 +517,9 @@ int radeon_device_init(struct radeon_device *rdev,
/* Initialize surface registers */
radeon_surface_init(rdev);

- /* TODO: disable VGA need to use VGA request */
+ radeon_vga_disable(rdev);
+ vga_set_legacy_decoding(rdev->pdev, VGA_RSRC_NONE);
+
/* BIOS*/
if (!radeon_get_bios(rdev)) {
if (ASIC_IS_AVIVO(rdev))
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 45b67d9..95106c7 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -786,6 +786,9 @@ struct drm_driver {
int (*gem_init_object) (struct drm_gem_object *obj);
void (*gem_free_object) (struct drm_gem_object *obj);

+ /* vga arb irq handler */
+ void (*vgaarb_irq)(struct drm_device *dev, bool state);
+
/* Driver private ops for this object */
struct vm_operations_struct *gem_vm_ops;

--
1.5.6.3


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