Re: [RFC PATCH 2/2] drm/i915/display: Implement fb_mmap callback function

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Hi Jani,

On 3/17/2023 10:39 AM, Jani Nikula wrote:
On Thu, 16 Mar 2023, Nirmoy Das <nirmoy.das@xxxxxxxxx> wrote:
If stolen memory allocation fails for fbdev, the driver will
fallback to system memory. Calculation of smem_start is wrong
for such framebuffer objs if the platform comes with no gmadr or
no aperture. Solve this by adding fb_mmap callback which will
use GTT if aperture is available otherwise will use cpu to access
the framebuffer.

Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
---
  drivers/gpu/drm/i915/display/intel_fbdev.c | 13 +++++++++++++
  1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index 673bcdfb7ff6..51d6fa034b00 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -40,8 +40,10 @@
  #include <drm/drm_crtc.h>
  #include <drm/drm_fb_helper.h>
  #include <drm/drm_fourcc.h>
+#include <drm/drm_gem_framebuffer_helper.h>
#include "gem/i915_gem_lmem.h"
+#include "gem/i915_gem_mman.h"
#include "i915_drv.h"
  #include "intel_display_types.h"
@@ -120,6 +122,16 @@ static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
  	return ret;
  }
+#define to_intel_fbdev(x) container_of(x, struct intel_fbdev, helper)
I'd add that as a function (rather than a macro) in a separate patch,
converting the existing users while at it.


Now I do see there are 5 instance of  this conversion. I will convert that into a function in a separate patch.


Thanks,

Nirmoy


BR,
Jani.


+static int intel_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
+{
+	struct intel_fbdev *fbdev = to_intel_fbdev(info->par);
+	struct drm_gem_object *bo = drm_gem_fb_get_obj(&fbdev->fb->base, 0);
+	struct drm_i915_gem_object *obj = to_intel_bo(bo);
+
+	return i915_gem_fb_mmap(obj, vma);
+}
+
  static const struct fb_ops intelfb_ops = {
  	.owner = THIS_MODULE,
  	DRM_FB_HELPER_DEFAULT_OPS,
@@ -131,6 +143,7 @@ static const struct fb_ops intelfb_ops = {
  	.fb_imageblit = drm_fb_helper_cfb_imageblit,
  	.fb_pan_display = intel_fbdev_pan_display,
  	.fb_blank = intel_fbdev_blank,
+	.fb_mmap = intel_fbdev_mmap,
  };
static int intelfb_alloc(struct drm_fb_helper *helper,



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