DRM: i915: add mode setting support

This commit adds i915 driver support for the DRM mode setting APIs.
Currently, VGA, LVDS, SDVO DVI & VGA, TV and DVO LVDS outputs are
supported.  HDMI, DisplayPort and additional SDVO output support will
follow.

Support for the mode setting code is controlled by the new 'modeset'
module option.  A new config option, CONFIG_DRM_I915_KMS controls the
default behavior, and whether a PCI ID list is built into the module for
use by user level module utilities.

Note that if mode setting is enabled, user level drivers that access
display registers directly or that don't use the kernel graphics memory
manager will likely corrupt kernel graphics memory, disrupt output
configuration (possibly leading to hangs and/or blank displays), and
prevent panic/oops messages from appearing.  So use caution when
enabling this code; be sure your user level code supports the new
interfaces.

A new SysRq key, 'g', provides emergency support for switching back to
the kernel's framebuffer console; which is useful for testing.

Co-authors: Dave Airlie <airlied@linux.ie>, Hong Liu <hong.liu@intel.com>

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 253 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 1b81b6a6d81..b5d0809eecb 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -28,6 +28,8 @@
 
 #include "drmP.h"
 #include "drm.h"
+#include "drm_crtc_helper.h"
+#include "intel_drv.h"
 #include "i915_drm.h"
 #include "i915_drv.h"
 
@@ -125,6 +127,13 @@ void i915_kernel_lost_context(struct drm_device * dev)
         struct drm_i915_master_private *master_priv;
         drm_i915_ring_buffer_t *ring = &(dev_priv->ring);
 
+        /*
+         * We should never lose context on the ring with modesetting
+         * as we don't expose it to userspace
+         */
+        if (drm_core_check_feature(dev, DRIVER_MODESET))
+                return;
+
         ring->head = I915_READ(PRB0_HEAD) & HEAD_ADDR;
         ring->tail = I915_READ(PRB0_TAIL) & TAIL_ADDR;
         ring->space = ring->head - (ring->tail + 8);
@@ -769,6 +778,11 @@ static int i915_set_status_page(struct drm_device *dev, void *data,
                 return -EINVAL;
         }
 
+        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+                WARN(1, "tried to set status page when mode setting active\n");
+                return 0;
+        }
+
         printk(KERN_DEBUG "set status page addr 0x%08x\n", (u32)hws->addr);
 
         dev_priv->status_gfx_addr = hws->addr & (0x1ffff<<12);
@@ -797,6 +811,173 @@ static int i915_set_status_page(struct drm_device *dev, void *data,
         return 0;
 }
 
+/**
+ * i915_probe_agp - get AGP bootup configuration
+ * @pdev: PCI device
+ * @aperture_size: returns AGP aperture configured size
+ * @preallocated_size: returns size of BIOS preallocated AGP space
+ *
+ * Since Intel integrated graphics are UMA, the BIOS has to set aside
+ * some RAM for the framebuffer at early boot.  This code figures out
+ * how much was set aside so we can use it for our own purposes.
+ */
+int i915_probe_agp(struct pci_dev *pdev, unsigned long *aperture_size,
+                   unsigned long *preallocated_size)
+{
+        struct pci_dev *bridge_dev;
+        u16 tmp = 0;
+        unsigned long overhead;
+
+        bridge_dev = pci_get_bus_and_slot(0, PCI_DEVFN(0,0));
+        if (!bridge_dev) {
+                DRM_ERROR("bridge device not found\n");
+                return -1;
+        }
+
+        /* Get the fb aperture size and "stolen" memory amount. */
+        pci_read_config_word(bridge_dev, INTEL_GMCH_CTRL, &tmp);
+        pci_dev_put(bridge_dev);
+
+        *aperture_size = 1024 * 1024;
+        *preallocated_size = 1024 * 1024;
+
+        switch (pdev->device) {
+        case PCI_DEVICE_ID_INTEL_82830_CGC:
+        case PCI_DEVICE_ID_INTEL_82845G_IG:
+        case PCI_DEVICE_ID_INTEL_82855GM_IG:
+        case PCI_DEVICE_ID_INTEL_82865_IG:
+                if ((tmp & INTEL_GMCH_MEM_MASK) == INTEL_GMCH_MEM_64M)
+                        *aperture_size *= 64;
+                else
+                        *aperture_size *= 128;
+                break;
+        default:
+                /* 9xx supports large sizes, just look at the length */
+                *aperture_size = pci_resource_len(pdev, 2);
+                break;
+        }
+
+        /*
+         * Some of the preallocated space is taken by the GTT
+         * and popup.  GTT is 1K per MB of aperture size, and popup is 4K.
+         */
+        overhead = (*aperture_size / 1024) + 4096;
+        switch (tmp & INTEL_855_GMCH_GMS_MASK) {
+        case INTEL_855_GMCH_GMS_STOLEN_1M:
+                break; /* 1M already */
+        case INTEL_855_GMCH_GMS_STOLEN_4M:
+                *preallocated_size *= 4;
+                break;
+        case INTEL_855_GMCH_GMS_STOLEN_8M:
+                *preallocated_size *= 8;
+                break;
+        case INTEL_855_GMCH_GMS_STOLEN_16M:
+                *preallocated_size *= 16;
+                break;
+        case INTEL_855_GMCH_GMS_STOLEN_32M:
+                *preallocated_size *= 32;
+                break;
+        case INTEL_915G_GMCH_GMS_STOLEN_48M:
+                *preallocated_size *= 48;
+                break;
+        case INTEL_915G_GMCH_GMS_STOLEN_64M:
+                *preallocated_size *= 64;
+                break;
+        case INTEL_855_GMCH_GMS_DISABLED:
+                DRM_ERROR("video memory is disabled\n");
+                return -1;
+        default:
+                DRM_ERROR("unexpected GMCH_GMS value: 0x%02x\n",
+                        tmp & INTEL_855_GMCH_GMS_MASK);
+                return -1;
+        }
+        *preallocated_size -= overhead;
+
+        return 0;
+}
+
+static int i915_load_modeset_init(struct drm_device *dev)
+{
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        unsigned long agp_size, prealloc_size;
+        int fb_bar = IS_I9XX(dev) ? 2 : 0;
+        int ret = 0;
+
+        dev->mode_config.fb_base = drm_get_resource_start(dev, fb_bar) &
+                0xff000000;
+
+        DRM_DEBUG("*** fb base 0x%08lx\n", dev->mode_config.fb_base);
+
+        if (IS_MOBILE(dev) || (IS_I9XX(dev) && !IS_I965G(dev) && !IS_G33(dev)))
+                dev_priv->cursor_needs_physical = true;
+        else
+                dev_priv->cursor_needs_physical = false;
+
+        i915_probe_agp(dev->pdev, &agp_size, &prealloc_size);
+
+        /* Basic memrange allocator for stolen space (aka vram) */
+        drm_mm_init(&dev_priv->vram, 0, prealloc_size);
+
+        /* Let GEM Manage from end of prealloc space to end of aperture */
+        i915_gem_do_init(dev, prealloc_size, agp_size);
+
+        ret = i915_gem_init_ringbuffer(dev);
+        if (ret)
+                goto out;
+
+        dev_priv->mm.gtt_mapping =
+                io_mapping_create_wc(dev->agp->base,
+                                     dev->agp->agp_info.aper_size * 1024*1024);
+
+        /* Allow hardware batchbuffers unless told otherwise.
+         */
+        dev_priv->allow_batchbuffer = 1;
+
+        ret = intel_init_bios(dev);
+        if (ret)
+                DRM_INFO("failed to find VBIOS tables\n");
+
+        ret = drm_irq_install(dev);
+        if (ret)
+                goto destroy_ringbuffer;
+
+        /* FIXME: re-add hotplug support */
+#if 0
+        ret = drm_hotplug_init(dev);
+        if (ret)
+                goto destroy_ringbuffer;
+#endif
+
+        /* Always safe in the mode setting case. */
+        /* FIXME: do pre/post-mode set stuff in core KMS code */
+        dev->vblank_disable_allowed = 1;
+
+        /*
+         * Initialize the hardware status page IRQ location.
+         */
+
+        I915_WRITE(INSTPM, (1 << 5) | (1 << 21));
+
+        intel_modeset_init(dev);
+
+        drm_helper_initial_config(dev, false);
+
+        dev->devname = kstrdup(DRIVER_NAME, GFP_KERNEL);
+        if (!dev->devname) {
+                ret = -ENOMEM;
+                goto modeset_cleanup;
+        }
+
+        return 0;
+
+modeset_cleanup:
+        intel_modeset_cleanup(dev);
+destroy_ringbuffer:
+        i915_gem_cleanup_ringbuffer(dev);
+out:
+        return ret;
+}
+
 int i915_master_create(struct drm_device *dev, struct drm_master *master)
 {
         struct drm_i915_master_private *master_priv;
@@ -821,6 +1002,25 @@ void i915_master_destroy(struct drm_device *dev, struct drm_master *master)
         master->driver_priv = NULL;
 }
 
+
+int i915_driver_firstopen(struct drm_device *dev)
+{
+        if (drm_core_check_feature(dev, DRIVER_MODESET))
+                return 0;
+        return 0;
+}
+
+/**
+ * i915_driver_load - setup chip and create an initial config
+ * @dev: DRM device
+ * @flags: startup flags
+ *
+ * The driver load routine has to do several things:
+ *   - drive output discovery via intel_modeset_init()
+ *   - initialize the memory manager
+ *   - allocate initial config memory
+ *   - setup the DRM framebuffer with the allocated memory
+ */
 int i915_driver_load(struct drm_device *dev, unsigned long flags)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
@@ -848,6 +1048,11 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
         size = drm_get_resource_len(dev, mmio_bar);
 
         dev_priv->regs = ioremap(base, size);
+        if (!dev_priv->regs) {
+                DRM_ERROR("failed to map registers\n");
+                ret = -EIO;
+                goto free_priv;
+        }
 
 #ifdef CONFIG_HIGHMEM64G
         /* don't enable GEM on PAE - needs agp + set_memory_* interface fixes */
@@ -863,7 +1068,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
         if (!I915_NEED_GFX_HWS(dev)) {
                 ret = i915_init_phys_hws(dev);
                 if (ret != 0)
-                        return ret;
+                        goto out_rmmap;
         }
 
         /* On the 945G/GM, the chipset reports the MSI capability on the
@@ -883,6 +1088,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
         intel_opregion_init(dev);
 
         spin_lock_init(&dev_priv->user_irq_lock);
+        dev_priv->user_irq_refcount = 0;
 
         ret = drm_vblank_init(dev, I915_NUM_PIPE);
 
@@ -891,6 +1097,20 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
                 return ret;
         }
 
+        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+                ret = i915_load_modeset_init(dev);
+                if (ret < 0) {
+                        DRM_ERROR("failed to init modeset\n");
+                        goto out_rmmap;
+                }
+        }
+
+        return 0;
+
+out_rmmap:
+        iounmap(dev_priv->regs);
+free_priv:
+        drm_free(dev_priv, sizeof(struct drm_i915_private), DRM_MEM_DRIVER);
         return ret;
 }
 
@@ -898,16 +1118,29 @@ int i915_driver_unload(struct drm_device *dev)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
 
+        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+                io_mapping_free(dev_priv->mm.gtt_mapping);
+                drm_irq_uninstall(dev);
+        }
+
         if (dev->pdev->msi_enabled)
                 pci_disable_msi(dev->pdev);
 
-        i915_free_hws(dev);
-
         if (dev_priv->regs != NULL)
                 iounmap(dev_priv->regs);
 
         intel_opregion_free(dev);
 
+        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+                intel_modeset_cleanup(dev);
+
+                mutex_lock(&dev->struct_mutex);
+                i915_gem_cleanup_ringbuffer(dev);
+                mutex_unlock(&dev->struct_mutex);
+                drm_mm_takedown(&dev_priv->vram);
+                i915_gem_lastclose(dev);
+        }
+
         drm_free(dev->dev_private, sizeof(drm_i915_private_t),
                  DRM_MEM_DRIVER);
 
@@ -933,12 +1166,26 @@ int i915_driver_open(struct drm_device *dev, struct drm_file *file_priv)
         return 0;
 }
 
+/**
+ * i915_driver_lastclose - clean up after all DRM clients have exited
+ * @dev: DRM device
+ *
+ * Take care of cleaning up after all DRM clients have exited.  In the
+ * mode setting case, we want to restore the kernel's initial mode (just
+ * in case the last client left us in a bad state).
+ *
+ * Additionally, in the non-mode setting case, we'll tear down the AGP
+ * and DMA structures, since the kernel won't be using them, and clea
+ * up any GEM state.
+ */
 void i915_driver_lastclose(struct drm_device * dev)
 {
         drm_i915_private_t *dev_priv = dev->dev_private;
 
-        if (!dev_priv)
+        if (!dev_priv || drm_core_check_feature(dev, DRIVER_MODESET)) {
+                intelfb_restore();
                 return;
+        }
 
         i915_gem_lastclose(dev);
 
@@ -951,7 +1198,8 @@ void i915_driver_lastclose(struct drm_device * dev)
 void i915_driver_preclose(struct drm_device * dev, struct drm_file *file_priv)
 {
         drm_i915_private_t *dev_priv = dev->dev_private;
-        i915_mem_release(dev, file_priv, dev_priv->agp_heap);
+        if (!drm_core_check_feature(dev, DRIVER_MODESET))
+                i915_mem_release(dev, file_priv, dev_priv->agp_heap);
 }
 
 void i915_driver_postclose(struct drm_device *dev, struct drm_file *file_priv)