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Message-ID: <20100413195004.GA4402@joi.lan>
Date: Tue, 13 Apr 2010 21:50:04 +0200
From: Marcin Slusarz <marcin.slusarz@...il.com>
To: Dave Airlie <airlied@...hat.com>
Cc: linux-fbdev@...r.kernel.org, nouveau@...ts.freedesktop.org,
LKML <linux-kernel@...r.kernel.org>,
dri-devel <dri-devel@...ts.freedesktop.org>,
Peter Jones <pjones@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] vga16fb, drm/nouveau: vga16fb->nouveau handoff
On Mon, Apr 12, 2010 at 11:33:27PM +0200, Marcin Slusarz wrote:
> > > > Have you got a pointer to a machine where it fails?
> > >
> > > No, it failed with an artifical test while I was working on vga16fb handoff
> > > (unfinished).
> >
> > You won't be able to make this work for vga16fb from what I can see
> > since it access 0xa000 directly, not via any of the defined apertures
> > that vesafb/offb use. vga16fb will need a different approach I suspect.
>
> Yeah, there's an idea to claim 0xa0000 as an aperture of vga16fb and then
> do the same in KMS driver but only if it's the primary card.
> (You hinted to use SHADOW resource bit to check whether card is primary)
> I think I'll try this approach soon.
Patch below works for me, but I couldn't test the case when nvidia card is secondary.
---
From: Marcin Slusarz <marcin.slusarz@...il.com>
Date: Tue, 13 Apr 2010 09:20:53 +0200
Subject: [PATCH] vga16fb, drm/nouveau: vga16fb->nouveau handoff
let vga16fb claim 0xA0000+0x10000 region as its aperture;
nouveau does not use it, so we need to lie to kick vga16fb,
but only if it's driving the primary card (by checking
IORESOURCE_ROM_SHADOW resource flag)
Signed-off-by: Marcin Slusarz <marcin.slusarz@...il.com>
---
drivers/gpu/drm/nouveau/nouveau_state.c | 11 ++++++++++-
drivers/video/vga16fb.c | 26 +++++++++++++++++++-------
2 files changed, 29 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c
index cfa3239..a101861 100644
--- a/drivers/gpu/drm/nouveau/nouveau_state.c
+++ b/drivers/gpu/drm/nouveau/nouveau_state.c
@@ -636,10 +636,12 @@ static void nouveau_OF_copy_vbios_to_ramin(struct drm_device *dev)
#endif
}
+#define VGA_FB_PHYS 0xA0000
+#define VGA_FB_PHYS_LEN 65536
static struct apertures_struct *nouveau_get_apertures(struct drm_device *dev)
{
struct pci_dev *pdev = dev->pdev;
- struct apertures_struct *aper = alloc_apertures(3);
+ struct apertures_struct *aper = alloc_apertures(4);
if (!aper)
return NULL;
@@ -658,6 +660,13 @@ static struct apertures_struct *nouveau_get_apertures(struct drm_device *dev)
aper->ranges[aper->count].size = pci_resource_len(pdev, 3);
aper->count++;
}
+
+ /* if it's the primary card, claim 0xa0000 as ours to kick vga16fb */
+ if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW) {
+ aper->ranges[aper->count].base = VGA_FB_PHYS;
+ aper->ranges[aper->count].size = VGA_FB_PHYS_LEN;
+ aper->count++;
+ }
return aper;
}
diff --git a/drivers/video/vga16fb.c b/drivers/video/vga16fb.c
index 76d8dae..45d7a3d 100644
--- a/drivers/video/vga16fb.c
+++ b/drivers/video/vga16fb.c
@@ -1264,10 +1264,19 @@ static void vga16fb_imageblit(struct fb_info *info, const struct fb_image *image
vga_imageblit_color(info, image);
}
+static void vga16fb_destroy(struct fb_info *info)
+{
+ iounmap(info->screen_base);
+ fb_dealloc_cmap(&info->cmap);
+ /* XXX unshare VGA regions */
+ framebuffer_release(info);
+}
+
static struct fb_ops vga16fb_ops = {
.owner = THIS_MODULE,
.fb_open = vga16fb_open,
.fb_release = vga16fb_release,
+ .fb_destroy = vga16fb_destroy,
.fb_check_var = vga16fb_check_var,
.fb_set_par = vga16fb_set_par,
.fb_setcolreg = vga16fb_setcolreg,
@@ -1307,6 +1316,11 @@ static int __devinit vga16fb_probe(struct platform_device *dev)
ret = -ENOMEM;
goto err_fb_alloc;
}
+ info->apertures = alloc_apertures(1);
+ if (!info->apertures) {
+ ret = -ENOMEM;
+ goto err_ioremap;
+ }
/* XXX share VGA_FB_PHYS and I/O region with vgacon and others */
info->screen_base = (void __iomem *)VGA_MAP_MEM(VGA_FB_PHYS, 0);
@@ -1336,7 +1350,7 @@ static int __devinit vga16fb_probe(struct platform_device *dev)
info->fix = vga16fb_fix;
/* supports rectangles with widths of multiples of 8 */
info->pixmap.blit_x = 1 << 7 | 1 << 15 | 1 << 23 | 1 << 31;
- info->flags = FBINFO_FLAG_DEFAULT |
+ info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
FBINFO_HWACCEL_YPAN;
i = (info->var.bits_per_pixel == 8) ? 256 : 16;
@@ -1355,6 +1369,9 @@ static int __devinit vga16fb_probe(struct platform_device *dev)
vga16fb_update_fix(info);
+ info->apertures->ranges[0].base = VGA_FB_PHYS;
+ info->apertures->ranges[0].size = VGA_FB_PHYS_LEN;
+
if (register_framebuffer(info) < 0) {
printk(KERN_ERR "vga16fb: unable to register framebuffer\n");
ret = -EINVAL;
@@ -1381,13 +1398,8 @@ static int vga16fb_remove(struct platform_device *dev)
{
struct fb_info *info = platform_get_drvdata(dev);
- if (info) {
+ if (info)
unregister_framebuffer(info);
- iounmap(info->screen_base);
- fb_dealloc_cmap(&info->cmap);
- /* XXX unshare VGA regions */
- framebuffer_release(info);
- }
return 0;
}
--
1.7.0.4
--
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