[PATCH] vga16fb, drm: vga16fb->drm handoff
From: Marcin Slusarz
Date: Sun Apr 18 2010 - 17:58:33 EST
On Tue, Apr 13, 2010 at 09:50:04PM +0200, Marcin Slusarz wrote:
> 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@xxxxxxxxx>
> 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@xxxxxxxxx>
> ---
> drivers/gpu/drm/nouveau/nouveau_state.c | 11 ++++++++++-
> drivers/video/vga16fb.c | 26 +++++++++++++++++++-------
> 2 files changed, 29 insertions(+), 8 deletions(-)
>
More generic approach below - it should work for all drm drivers.
Unfortunately vga16fb handoff has 2 other issues:
- It can be compiled as module, so it can be loaded after KMS driver (and
nothing prevents it right now)
- vga16fb registration error path is iounmapping memory which was not
ioremapped.
I'm going to fix it soon.
---
From: Marcin Slusarz <marcin.slusarz@xxxxxxxxx>
Subject: [PATCH] vga16fb, drm: vga16fb->drm handoff
let vga16fb claim 0xA0000+0x10000 region as its aperture;
drm drivers don't use it, so we have to detect it and kick
vga16fb manually - but only if drm is driving the primary card
(by checking IORESOURCE_ROM_SHADOW resource flag)
Signed-off-by: Marcin Slusarz <marcin.slusarz@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_fb.c | 1 +
drivers/gpu/drm/nouveau/nouveau_fbcon.c | 1 +
drivers/gpu/drm/nouveau/nouveau_state.c | 3 ++-
drivers/gpu/drm/radeon/radeon_fb.c | 1 +
drivers/gpu/drm/vmwgfx/vmwgfx_fb.c | 1 +
drivers/video/fbmem.c | 19 ++++++++++++++++---
drivers/video/vga16fb.c | 26 +++++++++++++++++++-------
include/linux/fb.h | 4 +++-
8 files changed, 44 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_fb.c b/drivers/gpu/drm/i915/intel_fb.c
index 6dbc277..8e403be 100644
--- a/drivers/gpu/drm/i915/intel_fb.c
+++ b/drivers/gpu/drm/i915/intel_fb.c
@@ -201,6 +201,7 @@ static int intelfb_create(struct drm_device *dev, uint32_t fb_width,
info->apertures->ranges[0].size = pci_resource_len(dev->pdev, 2);
else
info->apertures->ranges[0].size = pci_resource_len(dev->pdev, 0);
+ info->pcidev = dev->pdev;
info->fix.smem_start = dev->mode_config.fb_base + obj_priv->gtt_offset;
info->fix.smem_len = size;
diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.c b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
index 660746b..2e0d840 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fbcon.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
@@ -285,6 +285,7 @@ nouveau_fbcon_create(struct drm_device *dev, uint32_t fb_width,
ret = -ENOMEM;
goto out_unref;
}
+ info->pcidev = pdev;
info->pixmap.size = 64*1024;
info->pixmap.buf_align = 8;
diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c
index 3efc339..4916cf2 100644
--- a/drivers/gpu/drm/nouveau/nouveau_state.c
+++ b/drivers/gpu/drm/nouveau/nouveau_state.c
@@ -670,7 +670,8 @@ static int nouveau_remove_conflicting_drivers(struct drm_device *dev)
if (!dev_priv->apertures)
return -ENOMEM;
- remove_conflicting_framebuffers(dev_priv->apertures, "nouveaufb");
+ remove_conflicting_framebuffers(dev_priv->apertures, "nouveaufb",
+ dev->pdev);
return 0;
}
diff --git a/drivers/gpu/drm/radeon/radeon_fb.c b/drivers/gpu/drm/radeon/radeon_fb.c
index df06cdf..17de92a 100644
--- a/drivers/gpu/drm/radeon/radeon_fb.c
+++ b/drivers/gpu/drm/radeon/radeon_fb.c
@@ -271,6 +271,7 @@ int radeonfb_create(struct drm_device *dev,
}
info->apertures->ranges[0].base = rdev->ddev->mode_config.fb_base;
info->apertures->ranges[0].size = rdev->mc.real_vram_size;
+ info->pcidev = dev->pdev;
info->fix.mmio_start = 0;
info->fix.mmio_len = 0;
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
index 0248c6b..eda1336 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
@@ -566,6 +566,7 @@ int vmw_fb_init(struct vmw_private *vmw_priv)
}
info->apertures->ranges[0].base = vmw_priv->vram_start;
info->apertures->ranges[0].size = vmw_priv->vram_size;
+ info->pcidev = vmw_priv->dev->pdev;
/*
* Dirty & Deferred IO
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 7cfcd71..4628a59 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -32,6 +32,7 @@
#include <linux/device.h>
#include <linux/efi.h>
#include <linux/fb.h>
+#include <linux/pci.h>
#include <asm/fb.h>
@@ -1500,19 +1501,30 @@ static bool fb_do_apertures_overlap(struct apertures_struct *gena,
return false;
}
-void remove_conflicting_framebuffers(struct apertures_struct *a, const char *name)
+#define VGA_FB_PHYS 0xA0000
+void remove_conflicting_framebuffers(struct apertures_struct *a,
+ const char *name, struct pci_dev *pcidev)
{
int i;
+ bool primary = false;
+
+ if (pcidev)
+ primary = pcidev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
/* check all firmware fbs and kick off if the base addr overlaps */
for (i = 0 ; i < FB_MAX; i++) {
+ struct apertures_struct *gen_aper;
if (!registered_fb[i])
continue;
if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
continue;
+
+ gen_aper = registered_fb[i]->apertures;
+ if (fb_do_apertures_overlap(gen_aper, a) ||
+ (primary && gen_aper && gen_aper->count &&
+ gen_aper->ranges[0].base == VGA_FB_PHYS)) {
- if (fb_do_apertures_overlap(registered_fb[i]->apertures, a)) {
printk(KERN_ERR "fb: conflicting fb hw usage "
"%s vs %s - removing generic driver\n",
name, registered_fb[i]->fix.id);
@@ -1545,7 +1557,8 @@ register_framebuffer(struct fb_info *fb_info)
if (fb_check_foreignness(fb_info))
return -ENOSYS;
- remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id);
+ remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
+ fb_info->pcidev);
num_registered_fb++;
for (i = 0 ; i < FB_MAX; i++)
diff --git a/drivers/video/vga16fb.c b/drivers/video/vga16fb.c
index bf638a4..149c47a 100644
--- a/drivers/video/vga16fb.c
+++ b/drivers/video/vga16fb.c
@@ -1263,10 +1263,19 @@ 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,
@@ -1306,6 +1315,11 @@ 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);
@@ -1335,7 +1349,7 @@ 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;
@@ -1354,6 +1368,9 @@ 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;
@@ -1380,13 +1397,8 @@ 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;
}
diff --git a/include/linux/fb.h b/include/linux/fb.h
index f88e254..4b48e2f 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -870,6 +870,7 @@ struct fb_info {
resource_size_t size;
} ranges[0];
} *apertures;
+ struct pci_dev *pcidev;
};
static inline struct apertures_struct *alloc_apertures(unsigned int max_num) {
@@ -971,7 +972,8 @@ extern ssize_t fb_sys_write(struct fb_info *info, const char __user *buf,
/* drivers/video/fbmem.c */
extern int register_framebuffer(struct fb_info *fb_info);
extern int unregister_framebuffer(struct fb_info *fb_info);
-extern void remove_conflicting_framebuffers(struct apertures_struct *a, const char *name);
+extern void remove_conflicting_framebuffers(struct apertures_struct *a,
+ const char *name, struct pci_dev *pcidev);
extern int fb_prepare_logo(struct fb_info *fb_info, int rotate);
extern int fb_show_logo(struct fb_info *fb_info, int rotate);
extern char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size);
--
1.7.0.4
--
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