Linaro-mm-sig

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17 participants
3642 discussions

[PATCH v2 0/2] doc: uapi: Document dma-buf interop design & semantics

by Daniel Stone

Hi all, This is v2 to the linked patch series; thanks to everyone for reviewing the initial version. I've moved this out of a pure DRM scope and into the general userspace-API design section. Hopefully it helps others and answers a bunch of questions. I think it'd be great to have input/links/reflections from other subsystems as well here. Cheers, Daniel

3 years, 1 month

[PATCH v2] dma-buf/sw_sync: Avoid recursive lock during fence signal

by Rob Clark

From: Rob Clark <robdclark(a)chromium.org> If a signal callback releases the sw_sync fence, that will trigger a deadlock as the timeline_fence_release recurses onto the fence->lock (used both for signaling and the the timeline tree). To avoid that, temporarily hold an extra reference to the signalled fences until after we drop the lock. (This is an alternative implementation of https://patchwork.kernel.org/patch/11664717/ which avoids some potential UAF issues with the original patch.) v2: Remove now obsolete comment, use list_move_tail() and list_del_init() Reported-by: Bas Nieuwenhuizen <bas(a)basnieuwenhuizen.nl> Fixes: d3c6dd1fb30d ("dma-buf/sw_sync: Synchronize signal vs syncpt free") Signed-off-by: Rob Clark <robdclark(a)chromium.org> --- drivers/dma-buf/sw_sync.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/drivers/dma-buf/sw_sync.c b/drivers/dma-buf/sw_sync.c index 63f0aeb66db6..f0a35277fd84 100644 --- a/drivers/dma-buf/sw_sync.c +++ b/drivers/dma-buf/sw_sync.c @@ -191,6 +191,7 @@ static const struct dma_fence_ops timeline_fence_ops = { */ static void sync_timeline_signal(struct sync_timeline *obj, unsigned int inc) { + LIST_HEAD(signalled); struct sync_pt *pt, *next; trace_sync_timeline(obj); @@ -203,21 +204,20 @@ static void sync_timeline_signal(struct sync_timeline *obj, unsigned int inc) if (!timeline_fence_signaled(&pt->base)) break; - list_del_init(&pt->link); + dma_fence_get(&pt->base); + + list_move_tail(&pt->link, &signalled); rb_erase(&pt->node, &obj->pt_tree); - /* - * A signal callback may release the last reference to this - * fence, causing it to be freed. That operation has to be - * last to avoid a use after free inside this loop, and must - * be after we remove the fence from the timeline in order to - * prevent deadlocking on timeline->lock inside - * timeline_fence_release(). - */ dma_fence_signal_locked(&pt->base); } spin_unlock_irq(&obj->lock); + + list_for_each_entry_safe(pt, next, &signalled, link) { + list_del_init(&pt->link); + dma_fence_put(&pt->base); + } } /** -- 2.41.0

3 years, 1 month

[BUG] KCSAN: data-race in drm_sched_entity_is_ready [gpu_sched] / drm_sched_entity_push_job [gpu_sched]

by Mirsad Todorovac

Hi, This is your friendly bug reporter. The environment is vanilla torvalds tree kernel on Ubuntu 22.04 LTS and a Ryzen 7950X box. Please find attached the complete dmesg output from the ring buffer and lshw output. NOTE: The kernel reports tainted kernel, but to my knowledge there are no proprietary (G) modules, but this taint is turned on by the previous bugs. dmesg excerpt: [ 8791.864576] ================================================================== [ 8791.864648] BUG: KCSAN: data-race in drm_sched_entity_is_ready [gpu_sched] / drm_sched_entity_push_job [gpu_sched] [ 8791.864776] write (marked) to 0xffff9b74491b7c40 of 8 bytes by task 3807 on cpu 18: [ 8791.864788] drm_sched_entity_push_job+0xf4/0x2a0 [gpu_sched] [ 8791.864852] amdgpu_cs_ioctl+0x3888/0x3de0 [amdgpu] [ 8791.868731] drm_ioctl_kernel+0x127/0x210 [drm] [ 8791.869222] drm_ioctl+0x38f/0x6f0 [drm] [ 8791.869711] amdgpu_drm_ioctl+0x7e/0xe0 [amdgpu] [ 8791.873660] __x64_sys_ioctl+0xd2/0x120 [ 8791.873676] do_syscall_64+0x58/0x90 [ 8791.873688] entry_SYSCALL_64_after_hwframe+0x73/0xdd [ 8791.873710] read to 0xffff9b74491b7c40 of 8 bytes by task 1119 on cpu 27: [ 8791.873722] drm_sched_entity_is_ready+0x16/0x50 [gpu_sched] [ 8791.873786] drm_sched_select_entity+0x1c7/0x220 [gpu_sched] [ 8791.873849] drm_sched_main+0xd2/0x500 [gpu_sched] [ 8791.873912] kthread+0x18b/0x1d0 [ 8791.873924] ret_from_fork+0x43/0x70 [ 8791.873939] ret_from_fork_asm+0x1b/0x30 [ 8791.873955] value changed: 0x0000000000000000 -> 0xffff9b750ebcfc00 [ 8791.873971] Reported by Kernel Concurrency Sanitizer on: [ 8791.873980] CPU: 27 PID: 1119 Comm: gfx_0.0.0 Tainted: G L 6.5.0-rc6-net-cfg-kcsan-00038-g16931859a650 #35 [ 8791.873994] Hardware name: ASRock X670E PG Lightning/X670E PG Lightning, BIOS 1.21 04/26/2023 [ 8791.874002] ================================================================== Best regards, Mirsad Todorovac

3 years, 1 month

[QUESTION] drm/crtc: precondition for drm_crtc_init_with_planes()

by e.orlova＠ispras.ru

Documentation for drm_crtc_init_with_planes() in drivers/gpu/drm/drm_crtc.c states: «The crtc structure should not be allocated with devm_kzalloc()». However, in drivers/gpu/drm/stm/ltdc.c the 2nd argument of the function drm_crtc_init_with_planes() is a structure allocated with devm_kzalloc() Also, in drivers/gpu/drm/mediatek/mtk_drm_crtc.c drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c drivers/gpu/drm/logicvc/logicvc_crtc.c drivers/gpu/drm/meson/meson_crtc.c drivers/gpu/drm/mxsfb/lcdif_kms.c drivers/gpu/drm/mxsfb/mxsfb_kms.c drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c drivers/gpu/drm/rockchip/rockchip_drm_vop.c drivers/gpu/drm/rockchip/rockchip_drm_vop2.c drivers/gpu/drm/sun4i/sun4i_crtc.c drivers/gpu/drm/tegra/dc.c drivers/gpu/drm/tilcdc/tilcdc_crtc.c the 2nd argument of the function drm_crtc_init_with_planes() is a field of the structure allocated with devm_kzalloc() Is it correct or can it lead to any problems? -- Ekaterina Orlova Linux Verification Center, ISPRAS

3 years, 1 month

[PATCH (set 1) 00/20] Rid W=1 warnings from GPU

by Lee Jones

This set is part of a larger effort attempting to clean-up W=1 kernel builds, which are currently overwhelmingly riddled with niggly little warnings. Cc: Alex Deucher <alexander.deucher(a)amd.com> Cc: amd-gfx(a)lists.freedesktop.org Cc: Ben Skeggs <bskeggs(a)redhat.com> Cc: "Christian König" <christian.koenig(a)amd.com> Cc: Daniel Vetter <daniel(a)ffwll.ch> Cc: Danilo Krummrich <dakr(a)redhat.com> Cc: David Airlie <airlied(a)gmail.com> Cc: dri-devel(a)lists.freedesktop.org Cc: Fabio Estevam <festevam(a)gmail.com> Cc: Gourav Samaiya <gsamaiya(a)nvidia.com> Cc: Hawking Zhang <Hawking.Zhang(a)amd.com> Cc: Hyun Kwon <hyun.kwon(a)xilinx.com> Cc: Jerome Glisse <glisse(a)freedesktop.org> Cc: Jonathan Hunter <jonathanh(a)nvidia.com> Cc: Karol Herbst <kherbst(a)redhat.com> Cc: Laurent Pinchart <laurent.pinchart(a)ideasonboard.com> Cc: linaro-mm-sig(a)lists.linaro.org Cc: linux-arm-kernel(a)lists.infradead.org Cc: linux-media(a)vger.kernel.org Cc: linux-tegra(a)vger.kernel.org Cc: Luben Tuikov <luben.tuikov(a)amd.com> Cc: Lyude Paul <lyude(a)redhat.com> Cc: Maarten Lankhorst <maarten.lankhorst(a)linux.intel.com> Cc: "Maíra Canal" <mairacanal(a)riseup.net> Cc: Mario Limonciello <mario.limonciello(a)amd.com> Cc: Maxime Ripard <mripard(a)kernel.org> Cc: Michal Simek <michal.simek(a)xilinx.com> Cc: Mikko Perttunen <mperttunen(a)nvidia.com> Cc: nouveau(a)lists.freedesktop.org Cc: NXP Linux Team <linux-imx(a)nxp.com> Cc: "Pan, Xinhui" <Xinhui.Pan(a)amd.com> Cc: Pengutronix Kernel Team <kernel(a)pengutronix.de> Cc: Philipp Zabel <p.zabel(a)pengutronix.de> Cc: Sascha Hauer <s.hauer(a)pengutronix.de> Cc: Shashank Sharma <shashank.sharma(a)amd.com> Cc: Shawn Guo <shawnguo(a)kernel.org> Cc: Stanley Yang <Stanley.Yang(a)amd.com> Cc: Sumit Semwal <sumit.semwal(a)linaro.org> Cc: Thierry Reding <thierry.reding(a)gmail.com> Cc: Thomas Zimmermann <tzimmermann(a)suse.de> Lee Jones (20): drm/xlnx/zynqmp_disp: Use correct kerneldoc formatting in zynqmp_disp drm/nouveau/nvkm/subdev/acr/lsfw: Remove unused variable 'loc' drm/nouveau/nvkm/subdev/bios/init: Demote a bunch of kernel-doc abuses drm/nouveau/nvkm/subdev/volt/gk20a: Demote kerneldoc abuses drm/nouveau/nvkm/engine/gr/gf100: Demote kerneldoc abuse drm/nouveau/dispnv04/crtc: Demote kerneldoc abuses drm/radeon/radeon_ttm: Remove unused variable 'rbo' from radeon_bo_move() drm/amd/amdgpu/sdma_v6_0: Demote a bunch of half-completed function headers drm/tests/drm_kunit_helpers: Place correct function name in the comment header drm/scheduler/sched_main: Provide short description of missing param 'result' drm/amd/amdgpu/amdgpu_doorbell_mgr: Correct misdocumented param 'doorbell_index' drm/amd/amdgpu/amdgpu_device: Provide suitable description for param 'xcc_id' drm/tests/drm_kunit_helpers: Correct possible double-entry typo in 'ddrm_kunit_helper_acquire_ctx_alloc' drm/imx/ipuv3/imx-ldb: Increase buffer size to ensure all possible values can be stored drm/tegra/hub: Increase buffer size to ensure all possible values can be stored drm/drm_connector: Provide short description of param 'supported_colorspaces' drm/amd/amdgpu/amdgpu_ras: Increase buffer size to account for all possible values drm/drm_gpuva_mgr: Remove set but unused variable 'prev' drm/amd/amdgpu/amdgpu_sdma: Increase buffer size to account for all possible values drm/amd/amdgpu/imu_v11_0: Increase buffer size to ensure all possible values can be stored drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 1 + .../gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c | 2 +- drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h | 2 +- drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c | 2 +- drivers/gpu/drm/amd/amdgpu/imu_v11_0.c | 2 +- drivers/gpu/drm/amd/amdgpu/sdma_v6_0.c | 8 +- drivers/gpu/drm/drm_connector.c | 2 + drivers/gpu/drm/drm_gpuva_mgr.c | 10 +- drivers/gpu/drm/imx/ipuv3/imx-ldb.c | 2 +- drivers/gpu/drm/nouveau/dispnv04/crtc.c | 4 +- .../gpu/drm/nouveau/nvkm/engine/gr/gf100.c | 2 +- .../gpu/drm/nouveau/nvkm/subdev/acr/lsfw.c | 3 +- .../gpu/drm/nouveau/nvkm/subdev/bios/init.c | 136 +++++++++--------- .../gpu/drm/nouveau/nvkm/subdev/volt/gk20a.c | 4 +- drivers/gpu/drm/radeon/radeon_ttm.c | 2 - drivers/gpu/drm/scheduler/sched_main.c | 1 + drivers/gpu/drm/tegra/hub.c | 2 +- drivers/gpu/drm/tests/drm_kunit_helpers.c | 2 +- drivers/gpu/drm/xlnx/zynqmp_disp.c | 6 +- 19 files changed, 96 insertions(+), 97 deletions(-) -- 2.42.0.rc1.204.g551eb34607-goog

3 years, 1 month

[PATCH] dma-buf/heaps: map CMA all pages for user

by Hsia-Jun Li

Page fault would raise a CPU interrupt, it is not a good idea. Signed-off-by: Hsia-Jun(Randy) Li <randy.li(a)synaptics.com> --- drivers/dma-buf/heaps/cma_heap.c | 26 +++----------------------- 1 file changed, 3 insertions(+), 23 deletions(-) diff --git a/drivers/dma-buf/heaps/cma_heap.c b/drivers/dma-buf/heaps/cma_heap.c index ee899f8e6721..7d0b15ad21a7 100644 --- a/drivers/dma-buf/heaps/cma_heap.c +++ b/drivers/dma-buf/heaps/cma_heap.c @@ -160,35 +160,15 @@ static int cma_heap_dma_buf_end_cpu_access(struct dma_buf *dmabuf, return 0; } -static vm_fault_t cma_heap_vm_fault(struct vm_fault *vmf) -{ - struct vm_area_struct *vma = vmf->vma; - struct cma_heap_buffer *buffer = vma->vm_private_data; - - if (vmf->pgoff > buffer->pagecount) - return VM_FAULT_SIGBUS; - - vmf->page = buffer->pages[vmf->pgoff]; - get_page(vmf->page); - - return 0; -} - -static const struct vm_operations_struct dma_heap_vm_ops = { - .fault = cma_heap_vm_fault, -}; - static int cma_heap_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma) { struct cma_heap_buffer *buffer = dmabuf->priv; - if ((vma->vm_flags & (VM_SHARED | VM_MAYSHARE)) == 0) return -EINVAL; - vma->vm_ops = &dma_heap_vm_ops; - vma->vm_private_data = buffer; - - return 0; + return remap_pfn_range(vma, vma->vm_start, + page_to_pfn(buffer->pages[vma->vm_pgoff]), + vma->vm_end - vma->vm_start, vma->vm_page_prot); } static void *cma_heap_do_vmap(struct cma_heap_buffer *buffer) -- 2.17.1

3 years, 1 month

[PATCH] dma-buf/sw_sync: Avoid recursive lock during fence signal

by Rob Clark

From: Rob Clark <robdclark(a)chromium.org> If a signal callback releases the sw_sync fence, that will trigger a deadlock as the timeline_fence_release recurses onto the fence->lock (used both for signaling and the the timeline tree). To avoid that, temporarily hold an extra reference to the signalled fences until after we drop the lock. (This is an alternative implementation of https://patchwork.kernel.org/patch/11664717/ which avoids some potential UAF issues with the original patch.) Reported-by: Bas Nieuwenhuizen <bas(a)basnieuwenhuizen.nl> Fixes: d3c6dd1fb30d ("dma-buf/sw_sync: Synchronize signal vs syncpt free") Signed-off-by: Rob Clark <robdclark(a)chromium.org> --- drivers/dma-buf/sw_sync.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/dma-buf/sw_sync.c b/drivers/dma-buf/sw_sync.c index 63f0aeb66db6..ceb6a0408624 100644 --- a/drivers/dma-buf/sw_sync.c +++ b/drivers/dma-buf/sw_sync.c @@ -191,6 +191,7 @@ static const struct dma_fence_ops timeline_fence_ops = { */ static void sync_timeline_signal(struct sync_timeline *obj, unsigned int inc) { + LIST_HEAD(signalled); struct sync_pt *pt, *next; trace_sync_timeline(obj); @@ -203,9 +204,13 @@ static void sync_timeline_signal(struct sync_timeline *obj, unsigned int inc) if (!timeline_fence_signaled(&pt->base)) break; + dma_fence_get(&pt->base); + list_del_init(&pt->link); rb_erase(&pt->node, &obj->pt_tree); + list_add_tail(&pt->link, &signalled); + /* * A signal callback may release the last reference to this * fence, causing it to be freed. That operation has to be @@ -218,6 +223,11 @@ static void sync_timeline_signal(struct sync_timeline *obj, unsigned int inc) } spin_unlock_irq(&obj->lock); + + list_for_each_entry_safe(pt, next, &signalled, link) { + list_del(&pt->link); + dma_fence_put(&pt->base); + } } /** -- 2.41.0

3 years, 1 month

[PATCH -next] drm/scheduler: Remove unused declarations

by Yue Haibing

Commit 06a2d7cc3f04 ("drm/amdgpu: revert "implement tdr advanced mode"") removed drm_sched_reset_karma()/drm_sched_increase_karma_ext() but leave the declarations. Commit 2cf9886e2816 ("drm/scheduler: remove drm_sched_dependency_optimized") removed drm_sched_dependency_optimized() but not its declaration. Signed-off-by: Yue Haibing <yuehaibing(a)huawei.com> --- include/drm/gpu_scheduler.h | 4 ---- 1 file changed, 4 deletions(-) diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h index f9544d9b670d..cd8ac90865fc 100644 --- a/include/drm/gpu_scheduler.h +++ b/include/drm/gpu_scheduler.h @@ -554,10 +554,6 @@ void drm_sched_stop(struct drm_gpu_scheduler *sched, struct drm_sched_job *bad); void drm_sched_start(struct drm_gpu_scheduler *sched, bool full_recovery); void drm_sched_resubmit_jobs(struct drm_gpu_scheduler *sched); void drm_sched_increase_karma(struct drm_sched_job *bad); -void drm_sched_reset_karma(struct drm_sched_job *bad); -void drm_sched_increase_karma_ext(struct drm_sched_job *bad, int type); -bool drm_sched_dependency_optimized(struct dma_fence* fence, - struct drm_sched_entity *entity); void drm_sched_fault(struct drm_gpu_scheduler *sched); void drm_sched_rq_add_entity(struct drm_sched_rq *rq, -- 2.34.1

3 years, 2 months

[PATCH v3] misc: sram: Add DMA-BUF Heap exporting of SRAM areas

by Andrew Davis

This new export type exposes to userspace the SRAM area as a DMA-BUF Heap, this allows for allocations of DMA-BUFs that can be consumed by various DMA-BUF supporting devices. Signed-off-by: Andrew Davis <afd(a)ti.com> --- Changes from v2: - Make sram_dma_heap_allocate static (kernel test robot) - Rebase on v6.5-rc1 drivers/misc/Kconfig | 7 + drivers/misc/Makefile | 1 + drivers/misc/sram-dma-heap.c | 245 +++++++++++++++++++++++++++++++++++ drivers/misc/sram.c | 6 + drivers/misc/sram.h | 16 +++ 5 files changed, 275 insertions(+) create mode 100644 drivers/misc/sram-dma-heap.c diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 75e427f124b28..ee34dfb61605f 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -448,6 +448,13 @@ config SRAM config SRAM_EXEC bool +config SRAM_DMA_HEAP + bool "Export on-chip SRAM pools using DMA-Heaps" + depends on DMABUF_HEAPS && SRAM + help + This driver allows the export of on-chip SRAM marked as both pool + and exportable to userspace using the DMA-Heaps interface. + config DW_XDATA_PCIE depends on PCI tristate "Synopsys DesignWare xData PCIe driver" diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index f2a4d1ff65d46..5e7516bfaa8de 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -47,6 +47,7 @@ obj-$(CONFIG_VMWARE_VMCI) += vmw_vmci/ obj-$(CONFIG_LATTICE_ECP3_CONFIG) += lattice-ecp3-config.o obj-$(CONFIG_SRAM) += sram.o obj-$(CONFIG_SRAM_EXEC) += sram-exec.o +obj-$(CONFIG_SRAM_DMA_HEAP) += sram-dma-heap.o obj-$(CONFIG_GENWQE) += genwqe/ obj-$(CONFIG_ECHO) += echo/ obj-$(CONFIG_CXL_BASE) += cxl/ diff --git a/drivers/misc/sram-dma-heap.c b/drivers/misc/sram-dma-heap.c new file mode 100644 index 0000000000000..c054c04dff33e --- /dev/null +++ b/drivers/misc/sram-dma-heap.c @@ -0,0 +1,245 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SRAM DMA-Heap userspace exporter + * + * Copyright (C) 2019-2022 Texas Instruments Incorporated - https://www.ti.com/ + * Andrew Davis <afd(a)ti.com> + */ + +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/genalloc.h> +#include <linux/io.h> +#include <linux/mm.h> +#include <linux/scatterlist.h> +#include <linux/slab.h> +#include <linux/dma-buf.h> +#include <linux/dma-heap.h> + +#include "sram.h" + +struct sram_dma_heap { + struct dma_heap *heap; + struct gen_pool *pool; +}; + +struct sram_dma_heap_buffer { + struct gen_pool *pool; + struct list_head attachments; + struct mutex attachments_lock; + unsigned long len; + void *vaddr; + phys_addr_t paddr; +}; + +struct dma_heap_attachment { + struct device *dev; + struct sg_table *table; + struct list_head list; +}; + +static int dma_heap_attach(struct dma_buf *dmabuf, + struct dma_buf_attachment *attachment) +{ + struct sram_dma_heap_buffer *buffer = dmabuf->priv; + struct dma_heap_attachment *a; + struct sg_table *table; + + a = kzalloc(sizeof(*a), GFP_KERNEL); + if (!a) + return -ENOMEM; + + table = kmalloc(sizeof(*table), GFP_KERNEL); + if (!table) { + kfree(a); + return -ENOMEM; + } + if (sg_alloc_table(table, 1, GFP_KERNEL)) { + kfree(table); + kfree(a); + return -ENOMEM; + } + sg_set_page(table->sgl, pfn_to_page(PFN_DOWN(buffer->paddr)), buffer->len, 0); + + a->table = table; + a->dev = attachment->dev; + INIT_LIST_HEAD(&a->list); + + attachment->priv = a; + + mutex_lock(&buffer->attachments_lock); + list_add(&a->list, &buffer->attachments); + mutex_unlock(&buffer->attachments_lock); + + return 0; +} + +static void dma_heap_detatch(struct dma_buf *dmabuf, + struct dma_buf_attachment *attachment) +{ + struct sram_dma_heap_buffer *buffer = dmabuf->priv; + struct dma_heap_attachment *a = attachment->priv; + + mutex_lock(&buffer->attachments_lock); + list_del(&a->list); + mutex_unlock(&buffer->attachments_lock); + + sg_free_table(a->table); + kfree(a->table); + kfree(a); +} + +static struct sg_table *dma_heap_map_dma_buf(struct dma_buf_attachment *attachment, + enum dma_data_direction direction) +{ + struct dma_heap_attachment *a = attachment->priv; + struct sg_table *table = a->table; + + /* + * As this heap is backed by uncached SRAM memory we do not need to + * perform any sync operations on the buffer before allowing device + * domain access. For this reason we use SKIP_CPU_SYNC and also do + * not use or provide begin/end_cpu_access() dma-buf functions. + */ + if (!dma_map_sg_attrs(attachment->dev, table->sgl, table->nents, + direction, DMA_ATTR_SKIP_CPU_SYNC)) + return ERR_PTR(-ENOMEM); + + return table; +} + +static void dma_heap_unmap_dma_buf(struct dma_buf_attachment *attachment, + struct sg_table *table, + enum dma_data_direction direction) +{ + dma_unmap_sg_attrs(attachment->dev, table->sgl, table->nents, + direction, DMA_ATTR_SKIP_CPU_SYNC); +} + +static void dma_heap_dma_buf_release(struct dma_buf *dmabuf) +{ + struct sram_dma_heap_buffer *buffer = dmabuf->priv; + + gen_pool_free(buffer->pool, (unsigned long)buffer->vaddr, buffer->len); + kfree(buffer); +} + +static int dma_heap_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma) +{ + struct sram_dma_heap_buffer *buffer = dmabuf->priv; + int ret; + + /* SRAM mappings are not cached */ + vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); + + ret = vm_iomap_memory(vma, buffer->paddr, buffer->len); + if (ret) + pr_err("Could not map buffer to userspace\n"); + + return ret; +} + +static int dma_heap_vmap(struct dma_buf *dmabuf, struct iosys_map *map) +{ + struct sram_dma_heap_buffer *buffer = dmabuf->priv; + + iosys_map_set_vaddr(map, buffer->vaddr); + + return 0; +} + +static const struct dma_buf_ops sram_dma_heap_buf_ops = { + .attach = dma_heap_attach, + .detach = dma_heap_detatch, + .map_dma_buf = dma_heap_map_dma_buf, + .unmap_dma_buf = dma_heap_unmap_dma_buf, + .release = dma_heap_dma_buf_release, + .mmap = dma_heap_mmap, + .vmap = dma_heap_vmap, +}; + +static struct dma_buf *sram_dma_heap_allocate(struct dma_heap *heap, + unsigned long len, + unsigned long fd_flags, + unsigned long heap_flags) +{ + struct sram_dma_heap *sram_dma_heap = dma_heap_get_drvdata(heap); + struct sram_dma_heap_buffer *buffer; + + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + struct dma_buf *dmabuf; + int ret = 0; + + buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); + if (!buffer) + return ERR_PTR(-ENOMEM); + buffer->pool = sram_dma_heap->pool; + INIT_LIST_HEAD(&buffer->attachments); + mutex_init(&buffer->attachments_lock); + buffer->len = len; + + buffer->vaddr = (void *)gen_pool_alloc(buffer->pool, buffer->len); + if (!buffer->vaddr) { + ret = -ENOMEM; + goto free_buffer; + } + + buffer->paddr = gen_pool_virt_to_phys(buffer->pool, (unsigned long)buffer->vaddr); + if (buffer->paddr == -1) { + ret = -ENOMEM; + goto free_pool; + } + + /* create the dmabuf */ + exp_info.exp_name = dma_heap_get_name(heap); + exp_info.ops = &sram_dma_heap_buf_ops; + exp_info.size = buffer->len; + exp_info.flags = fd_flags; + exp_info.priv = buffer; + dmabuf = dma_buf_export(&exp_info); + if (IS_ERR(dmabuf)) { + ret = PTR_ERR(dmabuf); + goto free_pool; + } + + return dmabuf; + +free_pool: + gen_pool_free(buffer->pool, (unsigned long)buffer->vaddr, buffer->len); +free_buffer: + kfree(buffer); + + return ERR_PTR(ret); +} + +static struct dma_heap_ops sram_dma_heap_ops = { + .allocate = sram_dma_heap_allocate, +}; + +int sram_add_dma_heap(struct sram_dev *sram, + struct sram_reserve *block, + phys_addr_t start, + struct sram_partition *part) +{ + struct sram_dma_heap *sram_dma_heap; + struct dma_heap_export_info exp_info; + + dev_info(sram->dev, "Exporting SRAM Heap '%s'\n", block->label); + + sram_dma_heap = kzalloc(sizeof(*sram_dma_heap), GFP_KERNEL); + if (!sram_dma_heap) + return -ENOMEM; + sram_dma_heap->pool = part->pool; + + exp_info.name = kasprintf(GFP_KERNEL, "sram_%s", block->label); + exp_info.ops = &sram_dma_heap_ops; + exp_info.priv = sram_dma_heap; + sram_dma_heap->heap = dma_heap_add(&exp_info); + if (IS_ERR(sram_dma_heap->heap)) { + int ret = PTR_ERR(sram_dma_heap->heap); + kfree(sram_dma_heap); + return ret; + } + + return 0; +} diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c index 5757adf418b1d..6dd173a2fba8e 100644 --- a/drivers/misc/sram.c +++ b/drivers/misc/sram.c @@ -120,6 +120,12 @@ static int sram_add_partition(struct sram_dev *sram, struct sram_reserve *block, ret = sram_add_pool(sram, block, start, part); if (ret) return ret; + + if (block->export) { + ret = sram_add_dma_heap(sram, block, start, part); + if (ret) + return ret; + } } if (block->export) { ret = sram_add_export(sram, block, start, part); diff --git a/drivers/misc/sram.h b/drivers/misc/sram.h index 397205b8bf6ff..062bdd25fa068 100644 --- a/drivers/misc/sram.h +++ b/drivers/misc/sram.h @@ -60,4 +60,20 @@ static inline int sram_add_protect_exec(struct sram_partition *part) return -ENODEV; } #endif /* CONFIG_SRAM_EXEC */ + +#ifdef CONFIG_SRAM_DMA_HEAP +int sram_add_dma_heap(struct sram_dev *sram, + struct sram_reserve *block, + phys_addr_t start, + struct sram_partition *part); +#else +static inline int sram_add_dma_heap(struct sram_dev *sram, + struct sram_reserve *block, + phys_addr_t start, + struct sram_partition *part) +{ + return 0; +} +#endif /* CONFIG_SRAM_DMA_HEAP */ + #endif /* __SRAM_H */ -- 2.39.2

3 years, 2 months

Re: [PATCH v2] dma-contiguous: define proper name for global cma region

by Christoph Hellwig

Hi Pintu, On Sat, Jul 29, 2023 at 08:05:15AM +0530, Pintu Kumar wrote: > The current global cma region name defined as "reserved" > which is misleading, creates confusion and too generic. > > Also, the default cma allocation happens from global cma region, > so, if one has to figure out all allocations happening from > global cma region, this seems easier. > > Thus, change the name from "reserved" to "global-cma-region". I agree that reserved is not a very useful name. Unfortuately the name of the region leaks to userspace through cma_heap. So I think we need prep patches to hardcode "reserved" in add_default_cma_heap first, and then remove the cma_get_name first.

3 years, 2 months

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