From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- drivers/gpu/drm/drm_gem_cma_helper.c | 639 +++++++++++++++++++++++++++++++++++ 1 file changed, 639 insertions(+) create mode 100644 drivers/gpu/drm/drm_gem_cma_helper.c (limited to 'drivers/gpu/drm/drm_gem_cma_helper.c') diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c new file mode 100644 index 000000000..59b9ca207 --- /dev/null +++ b/drivers/gpu/drm/drm_gem_cma_helper.c @@ -0,0 +1,639 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * drm gem CMA (contiguous memory allocator) helper functions + * + * Copyright (C) 2012 Sascha Hauer, Pengutronix + * + * Based on Samsung Exynos code + * + * Copyright (c) 2011 Samsung Electronics Co., Ltd. + */ + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +/** + * DOC: cma helpers + * + * The Contiguous Memory Allocator reserves a pool of memory at early boot + * that is used to service requests for large blocks of contiguous memory. + * + * The DRM GEM/CMA helpers use this allocator as a means to provide buffer + * objects that are physically contiguous in memory. This is useful for + * display drivers that are unable to map scattered buffers via an IOMMU. + */ + +/** + * __drm_gem_cma_create - Create a GEM CMA object without allocating memory + * @drm: DRM device + * @size: size of the object to allocate + * + * This function creates and initializes a GEM CMA object of the given size, + * but doesn't allocate any memory to back the object. + * + * Returns: + * A struct drm_gem_cma_object * on success or an ERR_PTR()-encoded negative + * error code on failure. + */ +static struct drm_gem_cma_object * +__drm_gem_cma_create(struct drm_device *drm, size_t size) +{ + struct drm_gem_cma_object *cma_obj; + struct drm_gem_object *gem_obj; + int ret; + + if (drm->driver->gem_create_object) + gem_obj = drm->driver->gem_create_object(drm, size); + else + gem_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL); + if (!gem_obj) + return ERR_PTR(-ENOMEM); + cma_obj = container_of(gem_obj, struct drm_gem_cma_object, base); + + ret = drm_gem_object_init(drm, gem_obj, size); + if (ret) + goto error; + + ret = drm_gem_create_mmap_offset(gem_obj); + if (ret) { + drm_gem_object_release(gem_obj); + goto error; + } + + return cma_obj; + +error: + kfree(cma_obj); + return ERR_PTR(ret); +} + +/** + * drm_gem_cma_create - allocate an object with the given size + * @drm: DRM device + * @size: size of the object to allocate + * + * This function creates a CMA GEM object and allocates a contiguous chunk of + * memory as backing store. The backing memory has the writecombine attribute + * set. + * + * Returns: + * A struct drm_gem_cma_object * on success or an ERR_PTR()-encoded negative + * error code on failure. + */ +struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm, + size_t size) +{ + struct drm_gem_cma_object *cma_obj; + int ret; + + size = round_up(size, PAGE_SIZE); + + cma_obj = __drm_gem_cma_create(drm, size); + if (IS_ERR(cma_obj)) + return cma_obj; + + cma_obj->vaddr = dma_alloc_wc(drm->dev, size, &cma_obj->paddr, + GFP_KERNEL | __GFP_NOWARN); + if (!cma_obj->vaddr) { + drm_dbg(drm, "failed to allocate buffer with size %zu\n", + size); + ret = -ENOMEM; + goto error; + } + + return cma_obj; + +error: + drm_gem_object_put(&cma_obj->base); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(drm_gem_cma_create); + +/** + * drm_gem_cma_create_with_handle - allocate an object with the given size and + * return a GEM handle to it + * @file_priv: DRM file-private structure to register the handle for + * @drm: DRM device + * @size: size of the object to allocate + * @handle: return location for the GEM handle + * + * This function creates a CMA GEM object, allocating a physically contiguous + * chunk of memory as backing store. The GEM object is then added to the list + * of object associated with the given file and a handle to it is returned. + * + * Returns: + * A struct drm_gem_cma_object * on success or an ERR_PTR()-encoded negative + * error code on failure. + */ +static struct drm_gem_cma_object * +drm_gem_cma_create_with_handle(struct drm_file *file_priv, + struct drm_device *drm, size_t size, + uint32_t *handle) +{ + struct drm_gem_cma_object *cma_obj; + struct drm_gem_object *gem_obj; + int ret; + + cma_obj = drm_gem_cma_create(drm, size); + if (IS_ERR(cma_obj)) + return cma_obj; + + gem_obj = &cma_obj->base; + + /* + * allocate a id of idr table where the obj is registered + * and handle has the id what user can see. + */ + ret = drm_gem_handle_create(file_priv, gem_obj, handle); + /* drop reference from allocate - handle holds it now. */ + drm_gem_object_put(gem_obj); + if (ret) + return ERR_PTR(ret); + + return cma_obj; +} + +/** + * drm_gem_cma_free_object - free resources associated with a CMA GEM object + * @gem_obj: GEM object to free + * + * This function frees the backing memory of the CMA GEM object, cleans up the + * GEM object state and frees the memory used to store the object itself. + * If the buffer is imported and the virtual address is set, it is released. + * Drivers using the CMA helpers should set this as their + * &drm_driver.gem_free_object_unlocked callback. + */ +void drm_gem_cma_free_object(struct drm_gem_object *gem_obj) +{ + struct drm_gem_cma_object *cma_obj; + + cma_obj = to_drm_gem_cma_obj(gem_obj); + + if (gem_obj->import_attach) { + if (cma_obj->vaddr) + dma_buf_vunmap(gem_obj->import_attach->dmabuf, cma_obj->vaddr); + drm_prime_gem_destroy(gem_obj, cma_obj->sgt); + } else if (cma_obj->vaddr) { + dma_free_wc(gem_obj->dev->dev, cma_obj->base.size, + cma_obj->vaddr, cma_obj->paddr); + } + + drm_gem_object_release(gem_obj); + + kfree(cma_obj); +} +EXPORT_SYMBOL_GPL(drm_gem_cma_free_object); + +/** + * drm_gem_cma_dumb_create_internal - create a dumb buffer object + * @file_priv: DRM file-private structure to create the dumb buffer for + * @drm: DRM device + * @args: IOCTL data + * + * This aligns the pitch and size arguments to the minimum required. This is + * an internal helper that can be wrapped by a driver to account for hardware + * with more specific alignment requirements. It should not be used directly + * as their &drm_driver.dumb_create callback. + * + * Returns: + * 0 on success or a negative error code on failure. + */ +int drm_gem_cma_dumb_create_internal(struct drm_file *file_priv, + struct drm_device *drm, + struct drm_mode_create_dumb *args) +{ + unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); + struct drm_gem_cma_object *cma_obj; + + if (args->pitch < min_pitch) + args->pitch = min_pitch; + + if (args->size < args->pitch * args->height) + args->size = args->pitch * args->height; + + cma_obj = drm_gem_cma_create_with_handle(file_priv, drm, args->size, + &args->handle); + return PTR_ERR_OR_ZERO(cma_obj); +} +EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create_internal); + +/** + * drm_gem_cma_dumb_create - create a dumb buffer object + * @file_priv: DRM file-private structure to create the dumb buffer for + * @drm: DRM device + * @args: IOCTL data + * + * This function computes the pitch of the dumb buffer and rounds it up to an + * integer number of bytes per pixel. Drivers for hardware that doesn't have + * any additional restrictions on the pitch can directly use this function as + * their &drm_driver.dumb_create callback. + * + * For hardware with additional restrictions, drivers can adjust the fields + * set up by userspace and pass the IOCTL data along to the + * drm_gem_cma_dumb_create_internal() function. + * + * Returns: + * 0 on success or a negative error code on failure. + */ +int drm_gem_cma_dumb_create(struct drm_file *file_priv, + struct drm_device *drm, + struct drm_mode_create_dumb *args) +{ + struct drm_gem_cma_object *cma_obj; + + args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8); + args->size = args->pitch * args->height; + + cma_obj = drm_gem_cma_create_with_handle(file_priv, drm, args->size, + &args->handle); + return PTR_ERR_OR_ZERO(cma_obj); +} +EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create); + +const struct vm_operations_struct drm_gem_cma_vm_ops = { + .open = drm_gem_vm_open, + .close = drm_gem_vm_close, +}; +EXPORT_SYMBOL_GPL(drm_gem_cma_vm_ops); + +static int drm_gem_cma_mmap_obj(struct drm_gem_cma_object *cma_obj, + struct vm_area_struct *vma) +{ + int ret; + + /* + * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the + * vm_pgoff (used as a fake buffer offset by DRM) to 0 as we want to map + * the whole buffer. + */ + vma->vm_flags &= ~VM_PFNMAP; + vma->vm_pgoff = 0; + + ret = dma_mmap_wc(cma_obj->base.dev->dev, vma, cma_obj->vaddr, + cma_obj->paddr, vma->vm_end - vma->vm_start); + if (ret) + drm_gem_vm_close(vma); + + return ret; +} + +/** + * drm_gem_cma_mmap - memory-map a CMA GEM object + * @filp: file object + * @vma: VMA for the area to be mapped + * + * This function implements an augmented version of the GEM DRM file mmap + * operation for CMA objects: In addition to the usual GEM VMA setup it + * immediately faults in the entire object instead of using on-demaind + * faulting. Drivers which employ the CMA helpers should use this function + * as their ->mmap() handler in the DRM device file's file_operations + * structure. + * + * Instead of directly referencing this function, drivers should use the + * DEFINE_DRM_GEM_CMA_FOPS().macro. + * + * Returns: + * 0 on success or a negative error code on failure. + */ +int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma) +{ + struct drm_gem_cma_object *cma_obj; + struct drm_gem_object *gem_obj; + int ret; + + ret = drm_gem_mmap(filp, vma); + if (ret) + return ret; + + gem_obj = vma->vm_private_data; + cma_obj = to_drm_gem_cma_obj(gem_obj); + + return drm_gem_cma_mmap_obj(cma_obj, vma); +} +EXPORT_SYMBOL_GPL(drm_gem_cma_mmap); + +#ifndef CONFIG_MMU +/** + * drm_gem_cma_get_unmapped_area - propose address for mapping in noMMU cases + * @filp: file object + * @addr: memory address + * @len: buffer size + * @pgoff: page offset + * @flags: memory flags + * + * This function is used in noMMU platforms to propose address mapping + * for a given buffer. + * It's intended to be used as a direct handler for the struct + * &file_operations.get_unmapped_area operation. + * + * Returns: + * mapping address on success or a negative error code on failure. + */ +unsigned long drm_gem_cma_get_unmapped_area(struct file *filp, + unsigned long addr, + unsigned long len, + unsigned long pgoff, + 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_dev_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_put(obj); + return -EACCES; + } + + cma_obj = to_drm_gem_cma_obj(obj); + + drm_gem_object_put(obj); + + return cma_obj->vaddr ? (unsigned long)cma_obj->vaddr : -EINVAL; +} +EXPORT_SYMBOL_GPL(drm_gem_cma_get_unmapped_area); +#endif + +/** + * drm_gem_cma_print_info() - Print &drm_gem_cma_object info for debugfs + * @p: DRM printer + * @indent: Tab indentation level + * @obj: GEM object + * + * This function can be used as the &drm_driver->gem_print_info callback. + * It prints paddr and vaddr for use in e.g. debugfs output. + */ +void drm_gem_cma_print_info(struct drm_printer *p, unsigned int indent, + const struct drm_gem_object *obj) +{ + const struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj); + + drm_printf_indent(p, indent, "paddr=%pad\n", &cma_obj->paddr); + drm_printf_indent(p, indent, "vaddr=%p\n", cma_obj->vaddr); +} +EXPORT_SYMBOL(drm_gem_cma_print_info); + +/** + * 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 ERR_PTR(-ENOMEM); + + 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 ERR_PTR(ret); +} +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; + + /* check if the entries in the sg_table are contiguous */ + if (drm_prime_get_contiguous_size(sgt) < attach->dmabuf->size) + 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); + +static const struct drm_gem_object_funcs drm_gem_cma_default_funcs = { + .free = drm_gem_cma_free_object, + .print_info = drm_gem_cma_print_info, + .get_sg_table = drm_gem_cma_prime_get_sg_table, + .vmap = drm_gem_cma_prime_vmap, + .vm_ops = &drm_gem_cma_vm_ops, +}; + +/** + * drm_gem_cma_create_object_default_funcs - Create a CMA GEM object with a + * default function table + * @dev: DRM device + * @size: Size of the object to allocate + * + * This sets the GEM object functions to the default CMA helper functions. + * This function can be used as the &drm_driver.gem_create_object callback. + * + * Returns: + * A pointer to a allocated GEM object or an error pointer on failure. + */ +struct drm_gem_object * +drm_gem_cma_create_object_default_funcs(struct drm_device *dev, size_t size) +{ + struct drm_gem_cma_object *cma_obj; + + cma_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL); + if (!cma_obj) + return NULL; + + cma_obj->base.funcs = &drm_gem_cma_default_funcs; + + return &cma_obj->base; +} +EXPORT_SYMBOL(drm_gem_cma_create_object_default_funcs); + +/** + * drm_gem_cma_prime_import_sg_table_vmap - PRIME import another driver's + * scatter/gather table and get the virtual address of the buffer + * @dev: DRM device + * @attach: DMA-BUF attachment + * @sgt: Scatter/gather table of pinned pages + * + * This function imports a scatter/gather table using + * drm_gem_cma_prime_import_sg_table() and uses dma_buf_vmap() to get the kernel + * virtual address. This ensures that a CMA GEM object always has its virtual + * address set. This address is released when the object is freed. + * + * This function can be used as the &drm_driver.gem_prime_import_sg_table + * callback. The &DRM_GEM_CMA_DRIVER_OPS_VMAP macro provides a shortcut to set + * the necessary DRM driver operations. + * + * 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_vmap(struct drm_device *dev, + struct dma_buf_attachment *attach, + struct sg_table *sgt) +{ + struct drm_gem_cma_object *cma_obj; + struct drm_gem_object *obj; + void *vaddr; + + vaddr = dma_buf_vmap(attach->dmabuf); + if (!vaddr) { + DRM_ERROR("Failed to vmap PRIME buffer\n"); + return ERR_PTR(-ENOMEM); + } + + obj = drm_gem_cma_prime_import_sg_table(dev, attach, sgt); + if (IS_ERR(obj)) { + dma_buf_vunmap(attach->dmabuf, vaddr); + return obj; + } + + cma_obj = to_drm_gem_cma_obj(obj); + cma_obj->vaddr = vaddr; + + return obj; +} +EXPORT_SYMBOL(drm_gem_cma_prime_import_sg_table_vmap); -- cgit v1.2.3