[PATCH v3 00/25] drm/dumb-buffers: Fix and improve buffer-size calculation

From: Thomas Zimmermann <tzimmermann@suse.de>
To: maarten.lankhorst@linux.intel.com, mripard@kernel.org,
	airlied@gmail.com, simona@ffwll.ch
Cc: dri-devel@lists.freedesktop.org,
	linux-mediatek@lists.infradead.org,
	freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
	imx@lists.linux.dev, linux-samsung-soc@vger.kernel.org,
	nouveau@lists.freedesktop.org, virtualization@lists.linux.dev,
	spice-devel@lists.freedesktop.org,
	linux-renesas-soc@vger.kernel.org,
	linux-rockchip@lists.infradead.org, linux-tegra@vger.kernel.org,
	intel-xe@lists.freedesktop.org, xen-devel@lists.xenproject.org,
	Thomas Zimmermann <tzimmermann@suse.de>
Subject: [PATCH v3 00/25] drm/dumb-buffers: Fix and improve buffer-size calculation
Date: Tue, 18 Feb 2025 15:23:23 +0100	[thread overview]
Message-ID: <20250218142542.438557-1-tzimmermann@suse.de> (raw)

Dumb-buffer pitch and size is specified by width, height, bits-per-pixel
plus various hardware-specific alignments. The calculation of these
values is inconsistent and duplicated among drivers. The results for
formats with bpp < 8 are incorrect.

This series fixes this for most drivers. Default scanline pitch and
buffer size are now calculated with the existing 4CC helpers. There is
a new helper drm_mode_size_dumb() that calculates scanline pitch and
buffer size according to driver requirements.

The series fixes the common GEM implementations for DMA, SHMEM and
VRAM. It further changes most implementations of dumb_create to use
the new helper. A small number of drivers has more complicated
calculations and will be updated by a later patches.

v3:
- document UAPI semantics
- fall back to bpp-based allocation for unknown color modes
- cleanups
v2:
- rewrite series
- convert many individual drivers besides the shared GEM helpers

Thomas Zimmermann (25):
  drm/dumb-buffers: Sanitize output on errors
  drm/dumb-buffers: Provide helper to set pitch and size
  drm/gem-dma: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/gem-shmem: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/gem-vram: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/armada: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/exynos: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/gma500: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/hibmc: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/imx/ipuv3: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/loongson: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/mediatek: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/msm: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/nouveau: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/omapdrm: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/qxl: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/renesas/rcar-du: Compute dumb-buffer sizes with
    drm_mode_size_dumb()
  drm/renesas/rz-du: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/rockchip: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/tegra: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/virtio: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/vmwgfx: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/xe: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/xen: Compute dumb-buffer sizes with drm_mode_size_dumb()
  drm/xlnx: Compute dumb-buffer sizes with drm_mode_size_dumb()

 drivers/gpu/drm/armada/armada_gem.c           |  16 +-
 drivers/gpu/drm/drm_dumb_buffers.c            | 156 ++++++++++++++++--
 drivers/gpu/drm/drm_gem_dma_helper.c          |   7 +-
 drivers/gpu/drm/drm_gem_shmem_helper.c        |  16 +-
 drivers/gpu/drm/drm_gem_vram_helper.c         |  89 +++-------
 drivers/gpu/drm/exynos/exynos_drm_gem.c       |   8 +-
 drivers/gpu/drm/gma500/gem.c                  |  21 +--
 .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c   |  25 ++-
 drivers/gpu/drm/imx/ipuv3/imx-drm-core.c      |  29 +++-
 drivers/gpu/drm/loongson/lsdc_gem.c           |  29 +---
 drivers/gpu/drm/mediatek/mtk_gem.c            |  13 +-
 drivers/gpu/drm/msm/msm_gem.c                 |  27 ++-
 drivers/gpu/drm/nouveau/nouveau_display.c     |   7 +-
 drivers/gpu/drm/omapdrm/omap_gem.c            |  15 +-
 drivers/gpu/drm/qxl/qxl_dumb.c                |  17 +-
 drivers/gpu/drm/renesas/rcar-du/rcar_du_kms.c |   7 +-
 drivers/gpu/drm/renesas/rz-du/rzg2l_du_kms.c  |   7 +-
 drivers/gpu/drm/rockchip/rockchip_drm_gem.c   |  12 +-
 drivers/gpu/drm/tegra/gem.c                   |   8 +-
 drivers/gpu/drm/virtio/virtgpu_gem.c          |  11 +-
 drivers/gpu/drm/vmwgfx/vmwgfx_surface.c       |  21 +--
 drivers/gpu/drm/xe/xe_bo.c                    |   8 +-
 drivers/gpu/drm/xen/xen_drm_front.c           |   7 +-
 drivers/gpu/drm/xlnx/zynqmp_kms.c             |   7 +-
 include/drm/drm_dumb_buffers.h                |  14 ++
 include/drm/drm_gem_vram_helper.h             |   6 -
 include/uapi/drm/drm_mode.h                   |  46 +++++-
 27 files changed, 401 insertions(+), 228 deletions(-)
 create mode 100644 include/drm/drm_dumb_buffers.h

-- 
2.48.1

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