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ef96152e6a
-----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJYr5aeAAoJEAx081l5xIa+ZK4P/RD3XUsduYqziVFCRQ2n0X8r +D92F4peTnSeSq7ZcZvprv+fezUGAHbfsWFs8feYCI5quUO6pEQSPwN+wyGazUi0 4hUVB/K9Iq7U/Bj7Z/SmsU3NuWJnkNqbmvSFvUdqYK9D/kl+Tnllzap2N4cTzjwu GZOObz4n85cx94NqC3qw+7/ptL1X2MhXa+z0MzbkKyas84Bko1LwCSHRHsDKUnJc IcSpOcYZ6pSRMIsKH4Kd79Go4vWm7djXT9XL3PwDk2NcXXUOuR+cfdHqYchYaM/O iD2hvaSywBcflxSAml5x6vlXraoRd91ZZulgOObXtFfnUXdZB81TVq4uv6LU4Bx3 jLFixUZuk/TJT+W/8N10l7M6yMIFaTpNoNMc5n4IF5RNNyWba4BKnrI+f+lQiOpY mmjIaidb0t5BICnJzCD264RhCEXmP0HaDV+iQQV6y6jJRXfd1bgnOXLKP73JekzB TsbDshCoE7UO0dJ7n0LFpXSTQDTYzlazoEp14f2kFBxir5/l7r67nUlnDTvUQfuN tSRvpN/s0wqvH3o7zhmpHxyJ/ZasPMQjNCFAuUEbx8L5SKXsua0FubIzN4aVpilb XvfdFRWM/lkOT/q+8cGI/TcE3YTqEmALmGxdV/akbdNCiCg6aClyCLRE/DZhgmSQ UMFjr9wlHl5Qo/OqLKj0 =Yjfg -----END PGP SIGNATURE----- Merge tag 'drm-for-v4.11-less-shouty' of git://people.freedesktop.org/~airlied/linux Pull drm updates from Dave Airlie: "This is the main drm pull request for v4.11. Nothing too major, the tinydrm and mmu-less support should make writing smaller drivers easier for some of the simpler platforms, and there are a bunch of documentation updates. Intel grew displayport MST audio support which is hopefully useful to people, and FBC is on by default for GEN9+ (so people know where to look for regressions). AMDGPU has a lot of fixes that would like new firmware files installed for some GPUs. Other than that it's pretty scattered all over. I may have a follow up pull request as I know BenH has a bunch of AST rework and fixes and I'd like to get those in once they've been tested by AST, and I've got at least one pull request I'm just trying to get the author to fix up. Core: - drm_mm reworked - Connector list locking and iterators - Documentation updates - Format handling rework - MMU-less support for fbdev helpers - drm_crtc_from_index helper - Core CRC API - Remove drm_framebuffer_unregister_private - Debugfs cleanup - EDID/Infoframe fixes - Release callback - Tinydrm support (smaller drivers for simple hw) panel: - Add support for some new simple panels i915: - FBC by default for gen9+ - Shared dpll cleanups and docs - GEN8 powerdomain cleanup - DMC support on GLK - DP MST audio support - HuC loading support - GVT init ordering fixes - GVT IOMMU workaround fix amdgpu/radeon: - Power/clockgating improvements - Preliminary SR-IOV support - TTM buffer priority and eviction fixes - SI DPM quirks removed due to firmware fixes - Powerplay improvements - VCE/UVD powergating fixes - Cleanup SI GFX code to match CI/VI - Support for > 2 displays on 3/5 crtc asics - SI headless fixes nouveau: - Rework securre boot code in prep for GP10x secure boot - Channel recovery improvements - Initial power budget code - MMU rework preperation vmwgfx: - Bunch of fixes and cleanups exynos: - Runtime PM support for MIC driver - Cleanups to use atomic helpers - UHD Support for TM2/TM2E boards - Trigger mode fix for Rinato board etnaviv: - Shader performance fix - Command stream validator fixes - Command buffer suballocator rockchip: - CDN DisplayPort support - IOMMU support for arm64 platform imx-drm: - Fix i.MX5 TV encoder probing - Remove lower fb size limits msm: - Support for HW cursor on MDP5 devices - DSI encoder cleanup - GPU DT bindings cleanup sti: - stih410 cleanups - Create fbdev at binding - HQVDP fixes - Remove stih416 chip functionality - DVI/HDMI mode selection fixes - FPS statistic reporting omapdrm: - IRQ code cleanup dwi-hdmi bridge: - Cleanups and fixes adv-bridge: - Updates for nexus sii8520 bridge: - Add interlace mode support - Rework HDMI and lots of fixes qxl: - probing/teardown cleanups ZTE drm: - HDMI audio via SPDIF interface - Video Layer overlay plane support - Add TV encoder output device atmel-hlcdc: - Rework fbdev creation logic tegra: - OF node fix fsl-dcu: - Minor fixes mali-dp: - Assorted fixes sunxi: - Minor fix" [ This was the "fixed" pull, that still had build warnings due to people not even having build tested the result. I'm not a happy camper I've fixed the things I noticed up in this merge. - Linus ] * tag 'drm-for-v4.11-less-shouty' of git://people.freedesktop.org/~airlied/linux: (1177 commits) lib/Kconfig: make PRIME_NUMBERS not user selectable drm/tinydrm: helpers: Properly fix backlight dependency drm/tinydrm: mipi-dbi: Fix field width specifier warning drm/tinydrm: mipi-dbi: Silence: ‘cmd’ may be used uninitialized drm/sti: fix build warnings in sti_drv.c and sti_vtg.c files drm/amd/powerplay: fix PSI feature on Polars12 drm/amdgpu: refuse to reserve io mem for split VRAM buffers drm/ttm: fix use-after-free races in vm fault handling drm/tinydrm: Add support for Multi-Inno MI0283QT display dt-bindings: Add Multi-Inno MI0283QT binding dt-bindings: display/panel: Add common rotation property of: Add vendor prefix for Multi-Inno drm/tinydrm: Add MIPI DBI support drm/tinydrm: Add helper functions drm: Add DRM support for tiny LCD displays drm/amd/amdgpu: post card if there is real hw resetting performed drm/nouveau/tmr: provide backtrace when a timeout is hit drm/nouveau/pci/g92: Fix rearm drm/nouveau/drm/therm/fan: add a fallback if no fan control is specified in the vbios drm/nouveau/hwmon: expose power_max and power_crit ..
598 lines
17 KiB
C
598 lines
17 KiB
C
/*
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* drm gem CMA (contiguous memory allocator) helper functions
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*
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* Copyright (C) 2012 Sascha Hauer, Pengutronix
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*
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* Based on Samsung Exynos code
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*
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* Copyright (c) 2011 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/export.h>
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#include <linux/dma-buf.h>
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#include <linux/dma-mapping.h>
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#include <drm/drmP.h>
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#include <drm/drm.h>
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#include <drm/drm_gem_cma_helper.h>
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#include <drm/drm_vma_manager.h>
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/**
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* DOC: cma helpers
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*
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* The Contiguous Memory Allocator reserves a pool of memory at early boot
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* that is used to service requests for large blocks of contiguous memory.
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*
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* The DRM GEM/CMA helpers use this allocator as a means to provide buffer
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* objects that are physically contiguous in memory. This is useful for
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* display drivers that are unable to map scattered buffers via an IOMMU.
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*/
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/**
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* __drm_gem_cma_create - Create a GEM CMA object without allocating memory
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* @drm: DRM device
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* @size: size of the object to allocate
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*
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* This function creates and initializes a GEM CMA object of the given size,
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* but doesn't allocate any memory to back the object.
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*
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* Returns:
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* A struct drm_gem_cma_object * on success or an ERR_PTR()-encoded negative
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* error code on failure.
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*/
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static struct drm_gem_cma_object *
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__drm_gem_cma_create(struct drm_device *drm, size_t size)
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{
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struct drm_gem_cma_object *cma_obj;
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struct drm_gem_object *gem_obj;
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int ret;
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if (drm->driver->gem_create_object)
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gem_obj = drm->driver->gem_create_object(drm, size);
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else
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gem_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL);
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if (!gem_obj)
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return ERR_PTR(-ENOMEM);
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cma_obj = container_of(gem_obj, struct drm_gem_cma_object, base);
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ret = drm_gem_object_init(drm, gem_obj, size);
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if (ret)
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goto error;
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ret = drm_gem_create_mmap_offset(gem_obj);
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if (ret) {
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drm_gem_object_release(gem_obj);
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goto error;
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}
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return cma_obj;
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error:
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kfree(cma_obj);
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return ERR_PTR(ret);
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}
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/**
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* drm_gem_cma_create - allocate an object with the given size
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* @drm: DRM device
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* @size: size of the object to allocate
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*
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* This function creates a CMA GEM object and allocates a contiguous chunk of
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* memory as backing store. The backing memory has the writecombine attribute
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* set.
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*
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* Returns:
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* A struct drm_gem_cma_object * on success or an ERR_PTR()-encoded negative
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* error code on failure.
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*/
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struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
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size_t size)
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{
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struct drm_gem_cma_object *cma_obj;
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int ret;
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size = round_up(size, PAGE_SIZE);
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cma_obj = __drm_gem_cma_create(drm, size);
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if (IS_ERR(cma_obj))
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return cma_obj;
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cma_obj->vaddr = dma_alloc_wc(drm->dev, size, &cma_obj->paddr,
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GFP_KERNEL | __GFP_NOWARN);
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if (!cma_obj->vaddr) {
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dev_err(drm->dev, "failed to allocate buffer with size %zu\n",
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size);
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ret = -ENOMEM;
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goto error;
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}
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return cma_obj;
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error:
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drm_gem_object_unreference_unlocked(&cma_obj->base);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_create);
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/**
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* drm_gem_cma_create_with_handle - allocate an object with the given size and
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* return a GEM handle to it
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* @file_priv: DRM file-private structure to register the handle for
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* @drm: DRM device
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* @size: size of the object to allocate
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* @handle: return location for the GEM handle
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*
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* This function creates a CMA GEM object, allocating a physically contiguous
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* chunk of memory as backing store. The GEM object is then added to the list
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* of object associated with the given file and a handle to it is returned.
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*
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* Returns:
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* A struct drm_gem_cma_object * on success or an ERR_PTR()-encoded negative
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* error code on failure.
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*/
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static struct drm_gem_cma_object *
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drm_gem_cma_create_with_handle(struct drm_file *file_priv,
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struct drm_device *drm, size_t size,
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uint32_t *handle)
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{
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struct drm_gem_cma_object *cma_obj;
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struct drm_gem_object *gem_obj;
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int ret;
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cma_obj = drm_gem_cma_create(drm, size);
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if (IS_ERR(cma_obj))
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return cma_obj;
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gem_obj = &cma_obj->base;
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/*
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* allocate a id of idr table where the obj is registered
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* and handle has the id what user can see.
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*/
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ret = drm_gem_handle_create(file_priv, gem_obj, handle);
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/* drop reference from allocate - handle holds it now. */
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drm_gem_object_unreference_unlocked(gem_obj);
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if (ret)
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return ERR_PTR(ret);
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return cma_obj;
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}
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/**
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* drm_gem_cma_free_object - free resources associated with a CMA GEM object
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* @gem_obj: GEM object to free
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*
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* This function frees the backing memory of the CMA GEM object, cleans up the
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* GEM object state and frees the memory used to store the object itself.
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* Drivers using the CMA helpers should set this as their
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* &drm_driver.gem_free_object callback.
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*/
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void drm_gem_cma_free_object(struct drm_gem_object *gem_obj)
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{
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struct drm_gem_cma_object *cma_obj;
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cma_obj = to_drm_gem_cma_obj(gem_obj);
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if (cma_obj->vaddr) {
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dma_free_wc(gem_obj->dev->dev, cma_obj->base.size,
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cma_obj->vaddr, cma_obj->paddr);
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} else if (gem_obj->import_attach) {
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drm_prime_gem_destroy(gem_obj, cma_obj->sgt);
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}
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drm_gem_object_release(gem_obj);
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kfree(cma_obj);
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_free_object);
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/**
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* drm_gem_cma_dumb_create_internal - create a dumb buffer object
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* @file_priv: DRM file-private structure to create the dumb buffer for
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* @drm: DRM device
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* @args: IOCTL data
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*
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* This aligns the pitch and size arguments to the minimum required. This is
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* an internal helper that can be wrapped by a driver to account for hardware
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* with more specific alignment requirements. It should not be used directly
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* as their &drm_driver.dumb_create callback.
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*
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* Returns:
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* 0 on success or a negative error code on failure.
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*/
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int drm_gem_cma_dumb_create_internal(struct drm_file *file_priv,
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struct drm_device *drm,
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struct drm_mode_create_dumb *args)
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{
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unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
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struct drm_gem_cma_object *cma_obj;
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if (args->pitch < min_pitch)
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args->pitch = min_pitch;
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if (args->size < args->pitch * args->height)
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args->size = args->pitch * args->height;
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cma_obj = drm_gem_cma_create_with_handle(file_priv, drm, args->size,
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&args->handle);
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return PTR_ERR_OR_ZERO(cma_obj);
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create_internal);
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/**
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* drm_gem_cma_dumb_create - create a dumb buffer object
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* @file_priv: DRM file-private structure to create the dumb buffer for
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* @drm: DRM device
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* @args: IOCTL data
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*
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* This function computes the pitch of the dumb buffer and rounds it up to an
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* integer number of bytes per pixel. Drivers for hardware that doesn't have
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* any additional restrictions on the pitch can directly use this function as
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* their &drm_driver.dumb_create callback.
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*
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* For hardware with additional restrictions, drivers can adjust the fields
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* set up by userspace and pass the IOCTL data along to the
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* drm_gem_cma_dumb_create_internal() function.
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*
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* Returns:
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* 0 on success or a negative error code on failure.
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*/
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int drm_gem_cma_dumb_create(struct drm_file *file_priv,
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struct drm_device *drm,
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struct drm_mode_create_dumb *args)
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{
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struct drm_gem_cma_object *cma_obj;
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args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
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args->size = args->pitch * args->height;
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cma_obj = drm_gem_cma_create_with_handle(file_priv, drm, args->size,
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&args->handle);
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return PTR_ERR_OR_ZERO(cma_obj);
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create);
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/**
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* drm_gem_cma_dumb_map_offset - return the fake mmap offset for a CMA GEM
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* object
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* @file_priv: DRM file-private structure containing the GEM object
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* @drm: DRM device
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* @handle: GEM object handle
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* @offset: return location for the fake mmap offset
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*
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* This function look up an object by its handle and returns the fake mmap
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* offset associated with it. Drivers using the CMA helpers should set this
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* as their &drm_driver.dumb_map_offset callback.
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*
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* Returns:
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* 0 on success or a negative error code on failure.
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*/
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int drm_gem_cma_dumb_map_offset(struct drm_file *file_priv,
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struct drm_device *drm, u32 handle,
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u64 *offset)
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{
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struct drm_gem_object *gem_obj;
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gem_obj = drm_gem_object_lookup(file_priv, handle);
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if (!gem_obj) {
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dev_err(drm->dev, "failed to lookup GEM object\n");
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return -EINVAL;
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}
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*offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
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drm_gem_object_unreference_unlocked(gem_obj);
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return 0;
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_map_offset);
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const struct vm_operations_struct drm_gem_cma_vm_ops = {
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.open = drm_gem_vm_open,
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.close = drm_gem_vm_close,
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};
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EXPORT_SYMBOL_GPL(drm_gem_cma_vm_ops);
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static int drm_gem_cma_mmap_obj(struct drm_gem_cma_object *cma_obj,
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struct vm_area_struct *vma)
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{
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int ret;
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/*
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* Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the
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* vm_pgoff (used as a fake buffer offset by DRM) to 0 as we want to map
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* the whole buffer.
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*/
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vma->vm_flags &= ~VM_PFNMAP;
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vma->vm_pgoff = 0;
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ret = dma_mmap_wc(cma_obj->base.dev->dev, vma, cma_obj->vaddr,
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cma_obj->paddr, vma->vm_end - vma->vm_start);
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if (ret)
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drm_gem_vm_close(vma);
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return ret;
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}
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/**
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* drm_gem_cma_mmap - memory-map a CMA GEM object
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* @filp: file object
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* @vma: VMA for the area to be mapped
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*
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* This function implements an augmented version of the GEM DRM file mmap
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* operation for CMA objects: In addition to the usual GEM VMA setup it
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* immediately faults in the entire object instead of using on-demaind
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* faulting. Drivers which employ the CMA helpers should use this function
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* as their ->mmap() handler in the DRM device file's file_operations
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* structure.
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*
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* Returns:
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* 0 on success or a negative error code on failure.
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*/
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int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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struct drm_gem_cma_object *cma_obj;
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struct drm_gem_object *gem_obj;
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int ret;
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ret = drm_gem_mmap(filp, vma);
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if (ret)
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return ret;
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gem_obj = vma->vm_private_data;
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cma_obj = to_drm_gem_cma_obj(gem_obj);
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return drm_gem_cma_mmap_obj(cma_obj, vma);
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_mmap);
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#ifndef CONFIG_MMU
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/**
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* drm_gem_cma_get_unmapped_area - propose address for mapping in noMMU cases
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* @filp: file object
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* @addr: memory address
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* @len: buffer size
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* @pgoff: page offset
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* @flags: memory flags
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*
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* This function is used in noMMU platforms to propose address mapping
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* for a given buffer.
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* It's intended to be used as a direct handler for the struct
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* &file_operations.get_unmapped_area operation.
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*
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* Returns:
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* mapping address on success or a negative error code on failure.
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*/
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unsigned long drm_gem_cma_get_unmapped_area(struct file *filp,
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unsigned long addr,
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unsigned long len,
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unsigned long pgoff,
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unsigned long flags)
|
|
{
|
|
struct drm_gem_cma_object *cma_obj;
|
|
struct drm_gem_object *obj = NULL;
|
|
struct drm_file *priv = filp->private_data;
|
|
struct drm_device *dev = priv->minor->dev;
|
|
struct drm_vma_offset_node *node;
|
|
|
|
if (drm_device_is_unplugged(dev))
|
|
return -ENODEV;
|
|
|
|
drm_vma_offset_lock_lookup(dev->vma_offset_manager);
|
|
node = drm_vma_offset_exact_lookup_locked(dev->vma_offset_manager,
|
|
pgoff,
|
|
len >> PAGE_SHIFT);
|
|
if (likely(node)) {
|
|
obj = container_of(node, struct drm_gem_object, vma_node);
|
|
/*
|
|
* When the object is being freed, after it hits 0-refcnt it
|
|
* proceeds to tear down the object. In the process it will
|
|
* attempt to remove the VMA offset and so acquire this
|
|
* mgr->vm_lock. Therefore if we find an object with a 0-refcnt
|
|
* that matches our range, we know it is in the process of being
|
|
* destroyed and will be freed as soon as we release the lock -
|
|
* so we have to check for the 0-refcnted object and treat it as
|
|
* invalid.
|
|
*/
|
|
if (!kref_get_unless_zero(&obj->refcount))
|
|
obj = NULL;
|
|
}
|
|
|
|
drm_vma_offset_unlock_lookup(dev->vma_offset_manager);
|
|
|
|
if (!obj)
|
|
return -EINVAL;
|
|
|
|
if (!drm_vma_node_is_allowed(node, priv)) {
|
|
drm_gem_object_unreference_unlocked(obj);
|
|
return -EACCES;
|
|
}
|
|
|
|
cma_obj = to_drm_gem_cma_obj(obj);
|
|
|
|
drm_gem_object_unreference_unlocked(obj);
|
|
|
|
return cma_obj->vaddr ? (unsigned long)cma_obj->vaddr : -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_cma_get_unmapped_area);
|
|
#endif
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
/**
|
|
* drm_gem_cma_describe - describe a CMA GEM object for debugfs
|
|
* @cma_obj: CMA GEM object
|
|
* @m: debugfs file handle
|
|
*
|
|
* This function can be used to dump a human-readable representation of the
|
|
* CMA GEM object into a synthetic file.
|
|
*/
|
|
void drm_gem_cma_describe(struct drm_gem_cma_object *cma_obj,
|
|
struct seq_file *m)
|
|
{
|
|
struct drm_gem_object *obj = &cma_obj->base;
|
|
uint64_t off;
|
|
|
|
off = drm_vma_node_start(&obj->vma_node);
|
|
|
|
seq_printf(m, "%2d (%2d) %08llx %pad %p %zu",
|
|
obj->name, kref_read(&obj->refcount),
|
|
off, &cma_obj->paddr, cma_obj->vaddr, obj->size);
|
|
|
|
seq_printf(m, "\n");
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_cma_describe);
|
|
#endif
|
|
|
|
/**
|
|
* drm_gem_cma_prime_get_sg_table - provide a scatter/gather table of pinned
|
|
* pages for a CMA GEM object
|
|
* @obj: GEM object
|
|
*
|
|
* This function exports a scatter/gather table suitable for PRIME usage by
|
|
* calling the standard DMA mapping API. Drivers using the CMA helpers should
|
|
* set this as their &drm_driver.gem_prime_get_sg_table callback.
|
|
*
|
|
* Returns:
|
|
* A pointer to the scatter/gather table of pinned pages or NULL on failure.
|
|
*/
|
|
struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj)
|
|
{
|
|
struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
|
|
struct sg_table *sgt;
|
|
int ret;
|
|
|
|
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
|
|
if (!sgt)
|
|
return NULL;
|
|
|
|
ret = dma_get_sgtable(obj->dev->dev, sgt, cma_obj->vaddr,
|
|
cma_obj->paddr, obj->size);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
return sgt;
|
|
|
|
out:
|
|
kfree(sgt);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_get_sg_table);
|
|
|
|
/**
|
|
* drm_gem_cma_prime_import_sg_table - produce a CMA GEM object from another
|
|
* driver's scatter/gather table of pinned pages
|
|
* @dev: device to import into
|
|
* @attach: DMA-BUF attachment
|
|
* @sgt: scatter/gather table of pinned pages
|
|
*
|
|
* This function imports a scatter/gather table exported via DMA-BUF by
|
|
* another driver. Imported buffers must be physically contiguous in memory
|
|
* (i.e. the scatter/gather table must contain a single entry). Drivers that
|
|
* use the CMA helpers should set this as their
|
|
* &drm_driver.gem_prime_import_sg_table callback.
|
|
*
|
|
* Returns:
|
|
* A pointer to a newly created GEM object or an ERR_PTR-encoded negative
|
|
* error code on failure.
|
|
*/
|
|
struct drm_gem_object *
|
|
drm_gem_cma_prime_import_sg_table(struct drm_device *dev,
|
|
struct dma_buf_attachment *attach,
|
|
struct sg_table *sgt)
|
|
{
|
|
struct drm_gem_cma_object *cma_obj;
|
|
|
|
if (sgt->nents != 1)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
/* Create a CMA GEM buffer. */
|
|
cma_obj = __drm_gem_cma_create(dev, attach->dmabuf->size);
|
|
if (IS_ERR(cma_obj))
|
|
return ERR_CAST(cma_obj);
|
|
|
|
cma_obj->paddr = sg_dma_address(sgt->sgl);
|
|
cma_obj->sgt = sgt;
|
|
|
|
DRM_DEBUG_PRIME("dma_addr = %pad, size = %zu\n", &cma_obj->paddr, attach->dmabuf->size);
|
|
|
|
return &cma_obj->base;
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_import_sg_table);
|
|
|
|
/**
|
|
* drm_gem_cma_prime_mmap - memory-map an exported CMA GEM object
|
|
* @obj: GEM object
|
|
* @vma: VMA for the area to be mapped
|
|
*
|
|
* This function maps a buffer imported via DRM PRIME into a userspace
|
|
* process's address space. Drivers that use the CMA helpers should set this
|
|
* as their &drm_driver.gem_prime_mmap callback.
|
|
*
|
|
* Returns:
|
|
* 0 on success or a negative error code on failure.
|
|
*/
|
|
int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct drm_gem_cma_object *cma_obj;
|
|
int ret;
|
|
|
|
ret = drm_gem_mmap_obj(obj, obj->size, vma);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
cma_obj = to_drm_gem_cma_obj(obj);
|
|
return drm_gem_cma_mmap_obj(cma_obj, vma);
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_mmap);
|
|
|
|
/**
|
|
* drm_gem_cma_prime_vmap - map a CMA GEM object into the kernel's virtual
|
|
* address space
|
|
* @obj: GEM object
|
|
*
|
|
* This function maps a buffer exported via DRM PRIME into the kernel's
|
|
* virtual address space. Since the CMA buffers are already mapped into the
|
|
* kernel virtual address space this simply returns the cached virtual
|
|
* address. Drivers using the CMA helpers should set this as their DRM
|
|
* driver's &drm_driver.gem_prime_vmap callback.
|
|
*
|
|
* Returns:
|
|
* The kernel virtual address of the CMA GEM object's backing store.
|
|
*/
|
|
void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj)
|
|
{
|
|
struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
|
|
|
|
return cma_obj->vaddr;
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vmap);
|
|
|
|
/**
|
|
* drm_gem_cma_prime_vunmap - unmap a CMA GEM object from the kernel's virtual
|
|
* address space
|
|
* @obj: GEM object
|
|
* @vaddr: kernel virtual address where the CMA GEM object was mapped
|
|
*
|
|
* This function removes a buffer exported via DRM PRIME from the kernel's
|
|
* virtual address space. This is a no-op because CMA buffers cannot be
|
|
* unmapped from kernel space. Drivers using the CMA helpers should set this
|
|
* as their &drm_driver.gem_prime_vunmap callback.
|
|
*/
|
|
void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
|
|
{
|
|
/* Nothing to do */
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vunmap);
|