fbdev: allow passing more than one aperture for handoff

It removes a hack from nouveau code which had to detect which
region to pass to kick vesafb/efifb.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Eric Anholt <eric@anholt.net>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Peter Jones <pjones@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

5 files changed, 60 insertions, 20 deletions

diff --git a/drivers/video/efifb.c b/drivers/video/efifb.c
index 581d2db..3b98656 100644
--- a/drivers/video/efifb.c
+++ b/drivers/video/efifb.c
@@ -165,7 +165,7 @@ static void efifb_destroy(struct fb_info *info)
 {
 	if (info->screen_base)
 		iounmap(info->screen_base);
-	release_mem_region(info->aperture_base, info->aperture_size);
+	release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
 	framebuffer_release(info);
 }
 
@@ -289,8 +289,13 @@ static int __devinit efifb_probe(struct platform_device *dev)
 	info->pseudo_palette = info->par;
 	info->par = NULL;
 
-	info->aperture_base = efifb_fix.smem_start;
-	info->aperture_size = size_remap;
+	info->apertures = alloc_apertures(1);
+	if (!info->apertures) {
+		err = -ENOMEM;
+		goto err_release_fb;
+	}
+	info->apertures->ranges[0].base = efifb_fix.smem_start;
+	info->apertures->ranges[0].size = size_remap;
 
 	info->screen_base = ioremap(efifb_fix.smem_start, efifb_fix.smem_len);
 	if (!info->screen_base) {
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index a15b44e..03f2dc2 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1468,16 +1468,39 @@ static int fb_check_foreignness(struct fb_info *fi)
 	return 0;
 }
 
-static bool fb_do_apertures_overlap(struct fb_info *gen, struct fb_info *hw)
+static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
 {
 	/* is the generic aperture base the same as the HW one */
-	if (gen->aperture_base == hw->aperture_base)
+	if (gen->base == hw->base)
 		return true;
 	/* is the generic aperture base inside the hw base->hw base+size */
-	if (gen->aperture_base > hw->aperture_base && gen->aperture_base <= hw->aperture_base + hw->aperture_size)
+	if (gen->base > hw->base && gen->base <= hw->base + hw->size)
 		return true;
 	return false;
 }
+
+static bool fb_do_apertures_overlap(struct fb_info *gen, struct fb_info *hw)
+{
+	int i, j;
+	struct apertures_struct *hwa = hw->apertures;
+	struct apertures_struct *gena = gen->apertures;
+	if (!hwa || !gena)
+		return false;
+
+	for (i = 0; i < hwa->count; ++i) {
+		struct aperture *h = &hwa->ranges[i];
+		for (j = 0; j < gena->count; ++j) {
+			struct aperture *g = &gena->ranges[j];
+			printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
+				g->base, g->size, h->base, h->size);
+			if (apertures_overlap(g, h))
+				return true;
+		}
+	}
+
+	return false;
+}
+
 /**
  *	register_framebuffer - registers a frame buffer device
  *	@fb_info: frame buffer info structure
diff --git a/drivers/video/fbsysfs.c b/drivers/video/fbsysfs.c
index 81aa312..0a08f13 100644
--- a/drivers/video/fbsysfs.c
+++ b/drivers/video/fbsysfs.c
@@ -80,6 +80,7 @@ EXPORT_SYMBOL(framebuffer_alloc);
  */
 void framebuffer_release(struct fb_info *info)
 {
+	kfree(info->apertures);
 	kfree(info);
 }
 EXPORT_SYMBOL(framebuffer_release);
diff --git a/drivers/video/offb.c b/drivers/video/offb.c
index 61f8b8f..46dda7d 100644
--- a/drivers/video/offb.c
+++ b/drivers/video/offb.c
@@ -285,7 +285,7 @@ static void offb_destroy(struct fb_info *info)
 {
 	if (info->screen_base)
 		iounmap(info->screen_base);
-	release_mem_region(info->aperture_base, info->aperture_size);
+	release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
 	framebuffer_release(info);
 }
 
@@ -491,8 +491,11 @@ static void __init offb_init_fb(const char *name, const char *full_name,
 	var->vmode = FB_VMODE_NONINTERLACED;
 
 	/* set offb aperture size for generic probing */
-	info->aperture_base = address;
-	info->aperture_size = fix->smem_len;
+	info->apertures = alloc_apertures(1);
+	if (!info->apertures)
+		goto out_aper;
+	info->apertures->ranges[0].base = address;
+	info->apertures->ranges[0].size = fix->smem_len;
 
 	info->fbops = &offb_ops;
 	info->screen_base = ioremap(address, fix->smem_len);
@@ -501,17 +504,20 @@ static void __init offb_init_fb(const char *name, const char *full_name,
 
 	fb_alloc_cmap(&info->cmap, 256, 0);
 
-	if (register_framebuffer(info) < 0) {
-		iounmap(par->cmap_adr);
-		par->cmap_adr = NULL;
-		iounmap(info->screen_base);
-		framebuffer_release(info);
-		release_mem_region(res_start, res_size);
-		return;
-	}
+	if (register_framebuffer(info) < 0)
+		goto out_err;
 
 	printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
 	       info->node, full_name);
+	return;
+
+out_err:
+	iounmap(info->screen_base);
+out_aper:
+	iounmap(par->cmap_adr);
+	par->cmap_adr = NULL;
+	framebuffer_release(info);
+	release_mem_region(res_start, res_size);
 }
 
 
diff --git a/drivers/video/vesafb.c b/drivers/video/vesafb.c
index 0cadf7a..090aa1a 100644
--- a/drivers/video/vesafb.c
+++ b/drivers/video/vesafb.c
@@ -177,7 +177,7 @@ static void vesafb_destroy(struct fb_info *info)
 {
 	if (info->screen_base)
 		iounmap(info->screen_base);
-	release_mem_region(info->aperture_base, info->aperture_size);
+	release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
 	framebuffer_release(info);
 }
 
@@ -295,8 +295,13 @@ static int __init vesafb_probe(struct platform_device *dev)
 	info->par = NULL;
 
 	/* set vesafb aperture size for generic probing */
-	info->aperture_base = screen_info.lfb_base;
-	info->aperture_size = size_total;
+	info->apertures = alloc_apertures(1);
+	if (!info->apertures) {
+		err = -ENOMEM;
+		goto err;
+	}
+	info->apertures->ranges[0].base = screen_info.lfb_base;
+	info->apertures->ranges[0].size = size_total;
 
 	info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
 	if (!info->screen_base) {