drm/vgaarb: add VGA arbitration support to the drm and kms.

VGA arb requires DRM support for non-kms drivers, to turn on/off
irqs when disabling the mem/io regions.

VGA arb requires KMS support for GPUs where we can turn off VGA
decoding. Currently we know how to do this for intel and radeon
kms drivers, which allows them to be removed from the arbiter.

This patch comes from Fedora rawhide kernel.

Signed-off-by: Dave Airlie <airlied@redhat.com>

12 files changed, 130 insertions, 1 deletions

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index f85aaf21e783..0a6f0b3bdc78 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 +172,26 @@ 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 (!dev->irq_enabled)
+                return;
+
+        if (state)
+                dev->driver->irq_uninstall(dev);
+        else {
+                dev->driver->irq_preinstall(dev);
+                dev->driver->irq_postinstall(dev);
+        }
+}
+
 /**
  * Install IRQ handler.
  *
@@ -231,6 +252,9 @@ int drm_irq_install(struct drm_device *dev)
                 return ret;
         }
 
+        if (!drm_core_check_feature(dev, DRIVER_MODESET))
+                vga_client_register(dev->pdev, (void *)dev, drm_irq_vgaarb_nokms, NULL);
+
         /* After installing handler */
         ret = dev->driver->irq_postinstall(dev);
         if (ret < 0) {
@@ -279,6 +303,9 @@ 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_client_register(dev->pdev, NULL, 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 9909505d070a..5a49a1867b35 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -33,6 +33,7 @@
 #include "intel_drv.h"
 #include "i915_drm.h"
 #include "i915_drv.h"
+#include <linux/vgaarb.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
@@ -1012,6 +1013,19 @@ static int i915_probe_agp(struct drm_device *dev, uint32_t *aperture_size,
         return 0;
 }
 
+/* true = enable decode, false = disable decoder */
+static unsigned int i915_vga_set_decode(void *cookie, bool state)
+{
+        struct drm_device *dev = cookie;
+
+        intel_modeset_vga_set_state(dev, state);
+        if (state)
+                return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
+                       VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
+        else
+                return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
+}
+
 static int i915_load_modeset_init(struct drm_device *dev,
                                   unsigned long prealloc_size,
                                   unsigned long agp_size)
@@ -1057,6 +1071,11 @@ static int i915_load_modeset_init(struct drm_device *dev,
         if (ret)
                 DRM_INFO("failed to find VBIOS tables\n");
 
+        /* if we have > 1 VGA cards, then disable the radeon VGA resources */
+        ret = vga_client_register(dev->pdev, dev, NULL, i915_vga_set_decode);
+        if (ret)
+                goto destroy_ringbuffer;
+
         ret = drm_irq_install(dev);
         if (ret)
                 goto destroy_ringbuffer;
@@ -1324,6 +1343,7 @@ int i915_driver_unload(struct drm_device *dev)
 
         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
                 drm_irq_uninstall(dev);
+                vga_client_register(dev->pdev, NULL, NULL, NULL);
         }
 
         if (dev->pdev->msi_enabled)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 77ed060b4292..a0632f8e76ac 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -766,6 +766,7 @@ static inline void opregion_enable_asle(struct drm_device *dev) { return; }
 /* modesetting */
 extern void intel_modeset_init(struct drm_device *dev);
 extern void intel_modeset_cleanup(struct drm_device *dev);
+extern int intel_modeset_vga_set_state(struct drm_device *dev, bool state);
 
 /**
  * Lock test for when it's just for synchronization of ring access.
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index e38cd21161c8..3f7963553464 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 155719ff99d1..0227b1652906 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3917,3 +3917,20 @@ struct drm_encoder *intel_best_encoder(struct drm_connector *connector)
 
         return &intel_output->enc;
 }
+
+/*
+ * set vga decode state - true == enable VGA decode
+ */
+int intel_modeset_vga_set_state(struct drm_device *dev, bool state)
+{
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        u16 gmch_ctrl;
+
+        pci_read_config_word(dev_priv->bridge_dev, INTEL_GMCH_CTRL, &gmch_ctrl);
+        if (state)
+                gmch_ctrl &= ~INTEL_GMCH_VGA_DISABLE;
+        else
+                gmch_ctrl |= INTEL_GMCH_VGA_DISABLE;
+        pci_write_config_word(dev_priv->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 b9e47f1e1cc0..3a0004f755d0 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -178,4 +178,5 @@ 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);
+
 #endif /* __INTEL_DRV_H__ */
diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
index 737970b43aef..be51c5f7d0f6 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -1955,6 +1955,20 @@ void r100_vram_init_sizes(struct radeon_device *rdev)
                 rdev->mc.real_vram_size = rdev->mc.aper_size;
 }
 
+void r100_vga_set_state(struct radeon_device *rdev, bool state)
+{
+        uint32_t temp;
+
+        temp = RREG32(RADEON_CONFIG_CNTL);
+        if (state == false) {
+                temp &= ~(1<<8);
+                temp |= (1<<9);
+        } else {
+                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/r600.c b/drivers/gpu/drm/radeon/r600.c
index 5f42fad19190..eab31c1d6df1 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -1499,6 +1499,20 @@ int r600_startup(struct radeon_device *rdev)
         return 0;
 }
 
+void r600_vga_set_state(struct radeon_device *rdev, bool state)
+{
+        uint32_t temp;
+
+        temp = RREG32(CONFIG_CNTL);
+        if (state == false) {
+                temp &= ~(1<<0);
+                temp |= (1<<1);
+        } else {
+                temp &= ~(1<<1);
+        }
+        WREG32(CONFIG_CNTL, temp);
+}
+
 int r600_resume(struct radeon_device *rdev)
 {
         int r;
diff --git a/drivers/gpu/drm/radeon/r600d.h b/drivers/gpu/drm/radeon/r600d.h
index 723295f59281..4a9028a85c9b 100644
--- a/drivers/gpu/drm/radeon/r600d.h
+++ b/drivers/gpu/drm/radeon/r600d.h
@@ -78,6 +78,7 @@
 #define CB_COLOR0_MASK                                  0x28100
 
 #define CONFIG_MEMSIZE                                  0x5428
+#define CONFIG_CNTL                                     0x5424
 #define CP_STAT                                         0x8680
 #define CP_COHER_BASE                                   0x85F8
 #define CP_DEBUG                                        0xC1FC
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 817af8ecff10..c839b608970f 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -596,6 +596,7 @@ struct radeon_asic {
         int (*suspend)(struct radeon_device *rdev);
         void (*errata)(struct radeon_device *rdev);
         void (*vram_info)(struct radeon_device *rdev);
+        void (*vga_set_state)(struct radeon_device *rdev, bool state);
         int (*gpu_reset)(struct radeon_device *rdev);
         int (*mc_init)(struct radeon_device *rdev);
         void (*mc_fini)(struct radeon_device *rdev);
@@ -954,6 +955,7 @@ 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_set_state(rdev, state) (rdev)->asic->vga_set_state((rdev), (state))
 #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 5f2a9e6f12c5..8968f78fa1e3 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.h
+++ b/drivers/gpu/drm/radeon/radeon_asic.h
@@ -47,6 +47,7 @@ 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_set_state(struct radeon_device *rdev, bool state);
 int r100_gpu_reset(struct radeon_device *rdev);
 int r100_mc_init(struct radeon_device *rdev);
 void r100_mc_fini(struct radeon_device *rdev);
@@ -89,6 +90,7 @@ static struct radeon_asic r100_asic = {
         .init = &r100_init,
         .errata = &r100_errata,
         .vram_info = &r100_vram_info,
+        .vga_set_state = &r100_vga_set_state,
         .gpu_reset = &r100_gpu_reset,
         .mc_init = &r100_mc_init,
         .mc_fini = &r100_mc_fini,
@@ -158,6 +160,7 @@ static struct radeon_asic r300_asic = {
         .init = &r300_init,
         .errata = &r300_errata,
         .vram_info = &r300_vram_info,
+        .vga_set_state = &r100_vga_set_state,
         .gpu_reset = &r300_gpu_reset,
         .mc_init = &r300_mc_init,
         .mc_fini = &r300_mc_fini,
@@ -208,6 +211,7 @@ static struct radeon_asic r420_asic = {
         .resume = &r420_resume,
         .errata = NULL,
         .vram_info = NULL,
+        .vga_set_state = &r100_vga_set_state,
         .gpu_reset = &r300_gpu_reset,
         .mc_init = NULL,
         .mc_fini = NULL,
@@ -262,6 +266,7 @@ static struct radeon_asic rs400_asic = {
         .init = &r300_init,
         .errata = &rs400_errata,
         .vram_info = &rs400_vram_info,
+        .vga_set_state = &r100_vga_set_state,
         .gpu_reset = &r300_gpu_reset,
         .mc_init = &rs400_mc_init,
         .mc_fini = &rs400_mc_fini,
@@ -323,6 +328,7 @@ static struct radeon_asic rs600_asic = {
         .init = &rs600_init,
         .errata = &rs600_errata,
         .vram_info = &rs600_vram_info,
+        .vga_set_state = &r100_vga_set_state,
         .gpu_reset = &r300_gpu_reset,
         .mc_init = &rs600_mc_init,
         .mc_fini = &rs600_mc_fini,
@@ -372,6 +378,7 @@ static struct radeon_asic rs690_asic = {
         .init = &rs600_init,
         .errata = &rs690_errata,
         .vram_info = &rs690_vram_info,
+        .vga_set_state = &r100_vga_set_state,
         .gpu_reset = &r300_gpu_reset,
         .mc_init = &rs690_mc_init,
         .mc_fini = &rs690_mc_fini,
@@ -428,6 +435,7 @@ static struct radeon_asic rv515_asic = {
         .init = &rv515_init,
         .errata = &rv515_errata,
         .vram_info = &rv515_vram_info,
+        .vga_set_state = &r100_vga_set_state,
         .gpu_reset = &rv515_gpu_reset,
         .mc_init = &rv515_mc_init,
         .mc_fini = &rv515_mc_fini,
@@ -477,6 +485,7 @@ static struct radeon_asic r520_asic = {
         .init = &rv515_init,
         .errata = &r520_errata,
         .vram_info = &r520_vram_info,
+        .vga_set_state = &r100_vga_set_state,
         .gpu_reset = &rv515_gpu_reset,
         .mc_init = &r520_mc_init,
         .mc_fini = &r520_mc_fini,
@@ -520,6 +529,7 @@ int r600_init(struct radeon_device *rdev);
 void r600_fini(struct radeon_device *rdev);
 int r600_suspend(struct radeon_device *rdev);
 int r600_resume(struct radeon_device *rdev);
+void r600_vga_set_state(struct radeon_device *rdev, bool state);
 int r600_wb_init(struct radeon_device *rdev);
 void r600_wb_fini(struct radeon_device *rdev);
 void r600_cp_commit(struct radeon_device *rdev);
@@ -556,6 +566,7 @@ static struct radeon_asic r600_asic = {
         .resume = &r600_resume,
         .cp_commit = &r600_cp_commit,
         .vram_info = NULL,
+        .vga_set_state = &r600_vga_set_state,
         .gpu_reset = &r600_gpu_reset,
         .mc_init = NULL,
         .mc_fini = NULL,
@@ -606,6 +617,7 @@ static struct radeon_asic rv770_asic = {
         .cp_commit = &r600_cp_commit,
         .vram_info = NULL,
         .gpu_reset = &rv770_gpu_reset,
+        .vga_set_state = &r600_vga_set_state,
         .mc_init = NULL,
         .mc_fini = NULL,
         .wb_init = &r600_wb_init,
diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index 8a40c616b534..daf5db780956 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"
@@ -480,7 +481,18 @@ void radeon_combios_fini(struct radeon_device *rdev)
 {
 }
 
+/* if we get transitioned to only one device, tak VGA back */
+static unsigned int radeon_vga_set_decode(void *cookie, bool state)
+{
+        struct radeon_device *rdev = cookie;
 
+        radeon_vga_set_state(rdev, state);
+        if (state)
+                return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
+                       VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
+        else
+                return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
+}
 /*
  * Radeon device.
  */
@@ -578,6 +590,13 @@ int radeon_device_init(struct radeon_device *rdev,
         if (r) {
                 return r;
         }
+
+        /* if we have > 1 VGA cards, then disable the radeon VGA resources */
+        r = vga_client_register(rdev->pdev, rdev, NULL, radeon_vga_set_decode);
+        if (r) {
+                return -EINVAL;
+        }
+
         if (!rdev->new_init_path) {
                 /* Setup errata flags */
                 radeon_errata(rdev);
@@ -586,7 +605,6 @@ int radeon_device_init(struct radeon_device *rdev,
                 /* Initialize surface registers */
                 radeon_surface_init(rdev);
 
-                /* TODO: disable VGA need to use VGA request */
                 /* BIOS*/
                 if (!radeon_get_bios(rdev)) {
                         if (ASIC_IS_AVIVO(rdev))
@@ -697,6 +715,7 @@ void radeon_device_fini(struct radeon_device *rdev)
                 radeon_agp_fini(rdev);
 #endif
                 radeon_irq_kms_fini(rdev);
+                vga_client_register(rdev->pdev, NULL, NULL, NULL);
                 radeon_fence_driver_fini(rdev);
                 radeon_clocks_fini(rdev);
                 radeon_object_fini(rdev);