[Intel-gfx] [PATCH v3 7/9] drm/i915: Add an implement for the is_primary_gpu hook

[Sui Jingfeng]

From: Sui Jingfeng <suijingf...@loongson.cn>

This patch add a function to identify if a device is the default boot
selected by the firmware, it require the GPU has firmware framebuffer
driver support (such as efifb). If a specific hardware doesn't have
firmware framebuffer support, then the introduced function will just
return false. But even in this case, it still do no harms.

Cc: Jani Nikula <jani.nik...@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursu...@linux.intel.com>
Cc: David Airlie <airl...@gmail.com>
Cc: Daniel Vetter <dan...@ffwll.ch>
Cc: "Ville Syrjälä" <ville.syrj...@linux.intel.com>
Cc: Lyude Paul <ly...@redhat.com>
Signed-off-by: Sui Jingfeng <suijingf...@loongson.cn>
---
 drivers/gpu/drm/i915/display/intel_vga.c | 30 +++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_vga.c 
b/drivers/gpu/drm/i915/display/intel_vga.c
index 98d7d4dffe9f..465ac61e2fd9 100644
--- a/drivers/gpu/drm/i915/display/intel_vga.c
+++ b/drivers/gpu/drm/i915/display/intel_vga.c
@@ -3,9 +3,12 @@
  * Copyright © 2019 Intel Corporation
  */
 
+#include <linux/aperture.h>
 #include <linux/pci.h>
 #include <linux/vgaarb.h>
 
+#include <drm/drm_aperture.h>
+
 #include <video/vga.h>
 
 #include "soc/intel_gmch.h"
@@ -113,6 +116,30 @@ intel_vga_set_decode(struct pci_dev *pdev, bool 
enable_decode)
                return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
 }
 
+static bool intel_vga_is_primary_gpu(struct pci_dev *pdev)
+{
+       struct drm_i915_private *i915 = pdev_to_i915(pdev);
+       struct i915_gem_mm *mm = &i915->mm;
+       struct intel_gt *gt = &i915->gt0;
+       struct i915_ggtt *ggtt = gt->ggtt;
+       unsigned int i;
+
+       if (aperture_contain_firmware_fb(ggtt->gmadr.start, ggtt->gmadr.end))
+               return true;
+
+       for (i = 0; i < ARRAY_SIZE(mm->regions); i++) {
+               struct intel_memory_region *mr = mm->regions[i];
+
+               if (mr) {
+                       if (drm_aperture_contain_firmware_fb(mr->io_start,
+                                                            mr->io_size))
+                               return true;
+               }
+       }
+
+       return false;
+}
+
 int intel_vga_register(struct drm_i915_private *i915)
 {
        struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
@@ -126,7 +153,8 @@ int intel_vga_register(struct drm_i915_private *i915)
         * then we do not take part in VGA arbitration and the
         * vga_client_register() fails with -ENODEV.
         */
-       ret = vga_client_register(pdev, intel_vga_set_decode, NULL);
+       ret = vga_client_register(pdev, intel_vga_set_decode,
+                                 intel_vga_is_primary_gpu);
        if (ret && ret != -ENODEV)
                return ret;
 
-- 
2.25.1