drm/i915/bdw: support GMS and GGMS changes

All the BARs have the ability to grow.

v2: Pulled out the simulator workaround to a separate patch.
Rebased.

v3: Rebase onto latest vlv patches from Jesse.

v4: Rebased on top of the early stolen quirk patch from Jesse.

v5: Use the new macro names.
s/INTEL_BDW_PCI_IDS_D/INTEL_BDW_D_IDS
s/INTEL_BDW_PCI_IDS_M/INTEL_BDW_M_IDS
It's Jesse's fault for not following the convention I originally set.

Cc: Ingo Molnar <mingo@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

3 files changed, 42 insertions, 3 deletions

diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c
index b3cd3ebae077..96f958d8cd45 100644
--- a/arch/x86/kernel/early-quirks.c
+++ b/arch/x86/kernel/early-quirks.c
@@ -313,6 +313,16 @@ static size_t __init gen6_stolen_size(int num, int slot, int func)
         return gmch_ctrl << 25; /* 32 MB units */
 }
 
+static inline size_t gen8_stolen_size(int num, int slot, int func)
+{
+        u16 gmch_ctrl;
+
+        gmch_ctrl = read_pci_config_16(num, slot, func, SNB_GMCH_CTRL);
+        gmch_ctrl >>= BDW_GMCH_GMS_SHIFT;
+        gmch_ctrl &= BDW_GMCH_GMS_MASK;
+        return gmch_ctrl << 25; /* 32 MB units */
+}
+
 typedef size_t (*stolen_size_fn)(int num, int slot, int func);
 
 static struct pci_device_id intel_stolen_ids[] __initdata = {
@@ -336,6 +346,8 @@ static struct pci_device_id intel_stolen_ids[] __initdata = {
         INTEL_IVB_D_IDS(gen6_stolen_size),
         INTEL_HSW_D_IDS(gen6_stolen_size),
         INTEL_HSW_M_IDS(gen6_stolen_size),
+        INTEL_BDW_M_IDS(gen8_stolen_size),
+        INTEL_BDW_D_IDS(gen8_stolen_size)
 };
 
 static void __init intel_graphics_stolen(int num, int slot, int func)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 7d5a51fea1bb..074aec11fc9b 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -869,6 +869,15 @@ static inline unsigned int gen6_get_total_gtt_size(u16 snb_gmch_ctl)
         return snb_gmch_ctl << 20;
 }
 
+static inline unsigned int gen8_get_total_gtt_size(u16 bdw_gmch_ctl)
+{
+        bdw_gmch_ctl >>= BDW_GMCH_GGMS_SHIFT;
+        bdw_gmch_ctl &= BDW_GMCH_GGMS_MASK;
+        if (bdw_gmch_ctl)
+                bdw_gmch_ctl = 1 << bdw_gmch_ctl;
+        return bdw_gmch_ctl << 20;
+}
+
 static inline size_t gen6_get_stolen_size(u16 snb_gmch_ctl)
 {
         snb_gmch_ctl >>= SNB_GMCH_GMS_SHIFT;
@@ -876,6 +885,13 @@ static inline size_t gen6_get_stolen_size(u16 snb_gmch_ctl)
         return snb_gmch_ctl << 25; /* 32 MB units */
 }
 
+static inline size_t gen8_get_stolen_size(u16 bdw_gmch_ctl)
+{
+        bdw_gmch_ctl >>= BDW_GMCH_GMS_SHIFT;
+        bdw_gmch_ctl &= BDW_GMCH_GMS_MASK;
+        return bdw_gmch_ctl << 25; /* 32 MB units */
+}
+
 static int gen6_gmch_probe(struct drm_device *dev,
                            size_t *gtt_total,
                            size_t *stolen,
@@ -903,10 +919,16 @@ static int gen6_gmch_probe(struct drm_device *dev,
         if (!pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(40)))
                 pci_set_consistent_dma_mask(dev->pdev, DMA_BIT_MASK(40));
         pci_read_config_word(dev->pdev, SNB_GMCH_CTRL, &snb_gmch_ctl);
-        gtt_size = gen6_get_total_gtt_size(snb_gmch_ctl);
 
-        *stolen = gen6_get_stolen_size(snb_gmch_ctl);
-        *gtt_total = (gtt_size / sizeof(gen6_gtt_pte_t)) << PAGE_SHIFT;
+        if (IS_GEN8(dev)) {
+                gtt_size = gen8_get_total_gtt_size(snb_gmch_ctl);
+                *gtt_total = (gtt_size / 8) << PAGE_SHIFT;
+                *stolen = gen8_get_stolen_size(snb_gmch_ctl);
+        } else {
+                gtt_size = gen6_get_total_gtt_size(snb_gmch_ctl);
+                *gtt_total = (gtt_size / sizeof(gen6_gtt_pte_t)) << PAGE_SHIFT;
+                *stolen = gen6_get_stolen_size(snb_gmch_ctl);
+        }
 
         /* For Modern GENs the PTEs and register space are split in the BAR */
         gtt_bus_addr = pci_resource_start(dev->pdev, 0) +
@@ -916,6 +938,7 @@ static int gen6_gmch_probe(struct drm_device *dev,
         if (!dev_priv->gtt.gsm) {
                 DRM_ERROR("Failed to map the gtt page table\n");
                 return -ENOMEM;
+
         }
 
         ret = setup_scratch_page(dev);
diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h
index 3abfa6ea226e..97d5497debc1 100644
--- a/include/drm/i915_drm.h
+++ b/include/drm/i915_drm.h
@@ -49,6 +49,10 @@ extern bool i915_gpu_turbo_disable(void);
 #define    SNB_GMCH_GGMS_MASK   0x3
 #define    SNB_GMCH_GMS_SHIFT   3 /* Graphics Mode Select */
 #define    SNB_GMCH_GMS_MASK    0x1f
+#define    BDW_GMCH_GGMS_SHIFT  6
+#define    BDW_GMCH_GGMS_MASK   0x3
+#define    BDW_GMCH_GMS_SHIFT   8
+#define    BDW_GMCH_GMS_MASK    0xff
 
 #define I830_GMCH_CTRL                  0x52