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drm/mgag200: Reserve video memory for cursor plane

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The double-buffered cursor image is currently stored in video memory
by creating two BOs and pinning them to VRAM. The exact location is
chosen by VRAM helpers. The pinned cursor BOs can conflict with
framebuffer BOs and prevent the primary plane from displaying its
framebuffer.

As a first step to solving this problem, we reserve dedicated space at
the high end of the video memory for the cursor images. As the amount
of video memory now differs from the amount of available framebuffer
memory, size tests are adapted accordingly.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190927091301.10574-7-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2019-09-27 11:13:00 +02:00
parent 378c18386a
commit 2c51a66016
5 changed files with 23 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/gpu/drm/mgag200/mgag200_cursor.c
View File

@ -215,17 +215,20 @@ static void mgag200_move_cursor(struct mga_device *mdev, int x, int y)
int mgag200_cursor_init(struct mga_device *mdev)
{
struct drm_device *dev = mdev->dev;
size_t size;
size = roundup(64 * 48, PAGE_SIZE);
if (size * 2 > mdev->vram_fb_available)
return -ENOMEM;
/*
* Make small buffers to store a hardware cursor (double
* buffered icon updates)
*/
mdev->cursor.pixels_1 = drm_gem_vram_create(dev, &dev->vram_mm->bdev,
roundup(48*64, PAGE_SIZE),
0, 0);
size, 0, 0);
mdev->cursor.pixels_2 = drm_gem_vram_create(dev, &dev->vram_mm->bdev,
roundup(48*64, PAGE_SIZE),
0, 0);
size, 0, 0);
if (IS_ERR(mdev->cursor.pixels_2) || IS_ERR(mdev->cursor.pixels_1)) {
mdev->cursor.pixels_1 = NULL;
mdev->cursor.pixels_2 = NULL;
@ -234,6 +237,14 @@ int mgag200_cursor_init(struct mga_device *mdev)
}
mdev->cursor.pixels_current = NULL;
/*
* At the high end of video memory, we reserve space for
* buffer objects. The cursor plane uses this memory to store
* a double-buffered image of the current cursor. Hence, it's
* not available for framebuffers.
*/
mdev->vram_fb_available -= 2 * size;
return 0;
}

2
drivers/gpu/drm/mgag200/mgag200_drv.h
View File

@ -173,6 +173,8 @@ struct mga_device {
struct mga_cursor cursor;
size_t vram_fb_available;
bool suspended;
int num_crtc;
enum mga_type type;

2
drivers/gpu/drm/mgag200/mgag200_main.c
View File

@ -159,7 +159,7 @@ int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
drm_mode_config_init(dev);
dev->mode_config.funcs = (void *)&mga_mode_funcs;
if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
if (IS_G200_SE(mdev) && mdev->vram_fb_available < (2048*1024))
dev->mode_config.preferred_depth = 16;
else
dev->mode_config.preferred_depth = 32;

2
drivers/gpu/drm/mgag200/mgag200_mode.c
View File

@ -1629,7 +1629,7 @@ static enum drm_mode_status mga_vga_mode_valid(struct drm_connector *connector,
bpp = connector->cmdline_mode.bpp;
}
if ((mode->hdisplay * mode->vdisplay * (bpp/8)) > mdev->mc.vram_size) {
if ((mode->hdisplay * mode->vdisplay * (bpp/8)) > mdev->vram_fb_available) {
if (connector->cmdline_mode.specified)
connector->cmdline_mode.specified = false;
return MODE_BAD;

4
drivers/gpu/drm/mgag200/mgag200_ttm.c
View File

@ -50,6 +50,8 @@ int mgag200_mm_init(struct mga_device *mdev)
mdev->fb_mtrr = arch_phys_wc_add(pci_resource_start(dev->pdev, 0),
pci_resource_len(dev->pdev, 0));
mdev->vram_fb_available = mdev->mc.vram_size;
return 0;
}
@ -57,6 +59,8 @@ void mgag200_mm_fini(struct mga_device *mdev)
{
struct drm_device *dev = mdev->dev;
mdev->vram_fb_available = 0;
drm_vram_helper_release_mm(dev);
arch_io_free_memtype_wc(pci_resource_start(dev->pdev, 0),