drm: Add library for shmem backed GEM objects
This adds a library for shmem backed GEM objects. v8: - export drm_gem_shmem_create_with_handle - call mapping_set_gfp_mask to set default zone to GFP_HIGHUSER - Add helper drm_gem_shmem_get_pages_sgt() v7: - Use write-combine for mmap instead. This is the more common case. (robher) v6: - Fix uninitialized variable issue in an error path (anholt). - Add a drm_gem_shmem_vm_open() to the fops to get proper refcounting of the pages (anholt). v5: - Drop drm_gem_shmem_prime_mmap() (Daniel Vetter) - drm_gem_shmem_mmap(): Subtract drm_vma_node_start() to get the real vma->vm_pgoff - drm_gem_shmem_fault(): Use vmf->pgoff now that vma->vm_pgoff is correct v4: - Drop cache modes (Thomas Hellstrom) - Add a GEM attached vtable v3: - Grammar (Sam Ravnborg) - s/drm_gem_shmem_put_pages_unlocked/drm_gem_shmem_put_pages_locked/ (Sam Ravnborg) - Add debug output in error path (Sam Ravnborg) Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Signed-off-by: Eric Anholt <eric@anholt.net> Signed-off-by: Rob Herring <robh@kernel.org> Signed-off-by: Eric Anholt <eric@anholt.net> Reviewed-by: Eric Anholt <eric@anholt.net> Link: https://patchwork.freedesktop.org/patch/msgid/20190313004344.24169-1-robh@kernel.orghifive-unleashed-5.2
Noralf Trønnes
Eric Anholt
parent
2de3a07849
commit
2194a63a81
|
|
@ -369,3 +369,15 @@ Legacy CRTC/Modeset Helper Functions Reference
|
|||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_crtc_helper.c
|
||||
:export:
|
||||
|
||||
SHMEM GEM Helper Reference
|
||||
==========================
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_gem_shmem_helper.c
|
||||
:doc: overview
|
||||
|
||||
.. kernel-doc:: include/drm/drm_gem_shmem_helper.h
|
||||
:internal:
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_gem_shmem_helper.c
|
||||
:export:
|
||||
|
|
|
|||
|
|
@ -173,6 +173,12 @@ config DRM_KMS_CMA_HELPER
|
|||
help
|
||||
Choose this if you need the KMS CMA helper functions
|
||||
|
||||
config DRM_GEM_SHMEM_HELPER
|
||||
bool
|
||||
depends on DRM
|
||||
help
|
||||
Choose this if you need the GEM shmem helper functions
|
||||
|
||||
config DRM_VM
|
||||
bool
|
||||
depends on DRM && MMU
|
||||
|
|
|
|||
|
|
@ -25,6 +25,7 @@ drm-$(CONFIG_DRM_LIB_RANDOM) += lib/drm_random.o
|
|||
drm-$(CONFIG_DRM_VM) += drm_vm.o
|
||||
drm-$(CONFIG_COMPAT) += drm_ioc32.o
|
||||
drm-$(CONFIG_DRM_GEM_CMA_HELPER) += drm_gem_cma_helper.o
|
||||
drm-$(CONFIG_DRM_GEM_SHMEM_HELPER) += drm_gem_shmem_helper.o
|
||||
drm-$(CONFIG_PCI) += ati_pcigart.o
|
||||
drm-$(CONFIG_DRM_PANEL) += drm_panel.o
|
||||
drm-$(CONFIG_OF) += drm_of.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,625 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
/*
|
||||
* Copyright 2018 Noralf Trønnes
|
||||
*/
|
||||
|
||||
#include <linux/dma-buf.h>
|
||||
#include <linux/export.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/shmem_fs.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/vmalloc.h>
|
||||
|
||||
#include <drm/drm_device.h>
|
||||
#include <drm/drm_drv.h>
|
||||
#include <drm/drm_gem_shmem_helper.h>
|
||||
#include <drm/drm_prime.h>
|
||||
#include <drm/drm_print.h>
|
||||
|
||||
/**
|
||||
* DOC: overview
|
||||
*
|
||||
* This library provides helpers for GEM objects backed by shmem buffers
|
||||
* allocated using anonymous pageable memory.
|
||||
*/
|
||||
|
||||
static const struct drm_gem_object_funcs drm_gem_shmem_funcs = {
|
||||
.free = drm_gem_shmem_free_object,
|
||||
.print_info = drm_gem_shmem_print_info,
|
||||
.pin = drm_gem_shmem_pin,
|
||||
.unpin = drm_gem_shmem_unpin,
|
||||
.get_sg_table = drm_gem_shmem_get_sg_table,
|
||||
.vmap = drm_gem_shmem_vmap,
|
||||
.vunmap = drm_gem_shmem_vunmap,
|
||||
.vm_ops = &drm_gem_shmem_vm_ops,
|
||||
};
|
||||
|
||||
/**
|
||||
* drm_gem_shmem_create - Allocate an object with the given size
|
||||
* @dev: DRM device
|
||||
* @size: Size of the object to allocate
|
||||
*
|
||||
* This function creates a shmem GEM object.
|
||||
*
|
||||
* Returns:
|
||||
* A struct drm_gem_shmem_object * on success or an ERR_PTR()-encoded negative
|
||||
* error code on failure.
|
||||
*/
|
||||
struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, size_t size)
|
||||
{
|
||||
struct drm_gem_shmem_object *shmem;
|
||||
struct drm_gem_object *obj;
|
||||
int ret;
|
||||
|
||||
size = PAGE_ALIGN(size);
|
||||
|
||||
if (dev->driver->gem_create_object)
|
||||
obj = dev->driver->gem_create_object(dev, size);
|
||||
else
|
||||
obj = kzalloc(sizeof(*shmem), GFP_KERNEL);
|
||||
if (!obj)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
if (!obj->funcs)
|
||||
obj->funcs = &drm_gem_shmem_funcs;
|
||||
|
||||
ret = drm_gem_object_init(dev, obj, size);
|
||||
if (ret)
|
||||
goto err_free;
|
||||
|
||||
ret = drm_gem_create_mmap_offset(obj);
|
||||
if (ret)
|
||||
goto err_release;
|
||||
|
||||
shmem = to_drm_gem_shmem_obj(obj);
|
||||
mutex_init(&shmem->pages_lock);
|
||||
mutex_init(&shmem->vmap_lock);
|
||||
|
||||
/*
|
||||
* Our buffers are kept pinned, so allocating them
|
||||
* from the MOVABLE zone is a really bad idea, and
|
||||
* conflicts with CMA. See comments above new_inode()
|
||||
* why this is required _and_ expected if you're
|
||||
* going to pin these pages.
|
||||
*/
|
||||
mapping_set_gfp_mask(obj->filp->f_mapping, GFP_HIGHUSER |
|
||||
__GFP_RETRY_MAYFAIL | __GFP_NOWARN);
|
||||
|
||||
return shmem;
|
||||
|
||||
err_release:
|
||||
drm_gem_object_release(obj);
|
||||
err_free:
|
||||
kfree(obj);
|
||||
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(drm_gem_shmem_create);
|
||||
|
||||
/**
|
||||
* drm_gem_shmem_free_object - Free resources associated with a shmem GEM object
|
||||
* @obj: GEM object to free
|
||||
*
|
||||
* This function cleans up the GEM object state and frees the memory used to
|
||||
* store the object itself.
|
||||
*/
|
||||
void drm_gem_shmem_free_object(struct drm_gem_object *obj)
|
||||
{
|
||||
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
|
||||
|
||||
WARN_ON(shmem->vmap_use_count);
|
||||
|
||||
if (obj->import_attach) {
|
||||
shmem->pages_use_count--;
|
||||
drm_prime_gem_destroy(obj, shmem->sgt);
|
||||
kvfree(shmem->pages);
|
||||
} else {
|
||||
if (shmem->sgt) {
|
||||
dma_unmap_sg(obj->dev->dev, shmem->sgt->sgl,
|
||||
shmem->sgt->nents, DMA_BIDIRECTIONAL);
|
||||
|
||||
drm_gem_shmem_put_pages(shmem);
|
||||
sg_free_table(shmem->sgt);
|
||||
kfree(shmem->sgt);
|
||||
}
|
||||
}
|
||||
|
||||
WARN_ON(shmem->pages_use_count);
|
||||
|
||||
drm_gem_object_release(obj);
|
||||
mutex_destroy(&shmem->pages_lock);
|
||||
mutex_destroy(&shmem->vmap_lock);
|
||||
kfree(shmem);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(drm_gem_shmem_free_object);
|
||||
|
||||
static int drm_gem_shmem_get_pages_locked(struct drm_gem_shmem_object *shmem)
|
||||
{
|
||||
struct drm_gem_object *obj = &shmem->base;
|
||||
struct page **pages;
|
||||
|
||||
if (shmem->pages_use_count++ > 0)
|
||||
return 0;
|
||||
|
||||
pages = drm_gem_get_pages(obj);
|
||||
if (IS_ERR(pages)) {
|
||||
DRM_DEBUG_KMS("Failed to get pages (%ld)\n", PTR_ERR(pages));
|
||||
shmem->pages_use_count = 0;
|
||||
return PTR_ERR(pages);
|
||||
}
|
||||
|
||||
shmem->pages = pages;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* drm_gem_shmem_get_pages - Allocate backing pages for a shmem GEM object
|
||||
* @shmem: shmem GEM object
|
||||
*
|
||||
* This function makes sure that backing pages exists for the shmem GEM object
|
||||
* and increases the use count.
|
||||
*
|
||||
* Returns:
|
||||
* 0 on success or a negative error code on failure.
|
||||
*/
|
||||
int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = mutex_lock_interruptible(&shmem->pages_lock);
|
||||
if (ret)
|
||||
return ret;
|
||||
ret = drm_gem_shmem_get_pages_locked(shmem);
|
||||
mutex_unlock(&shmem->pages_lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(drm_gem_shmem_get_pages);
|
||||
|
||||
static void drm_gem_shmem_put_pages_locked(struct drm_gem_shmem_object *shmem)
|
||||
{
|
||||
struct drm_gem_object *obj = &shmem->base;
|
||||
|
||||
if (WARN_ON_ONCE(!shmem->pages_use_count))
|
||||
return;
|
||||
|
||||
if (--shmem->pages_use_count > 0)
|
||||
return;
|
||||
|
||||
drm_gem_put_pages(obj, shmem->pages,
|
||||
shmem->pages_mark_dirty_on_put,
|
||||
shmem->pages_mark_accessed_on_put);
|
||||
shmem->pages = NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* drm_gem_shmem_put_pages - Decrease use count on the backing pages for a shmem GEM object
|
||||
* @shmem: shmem GEM object
|
||||
*
|
||||
* This function decreases the use count and puts the backing pages when use drops to zero.
|
||||
*/
|
||||
void drm_gem_shmem_put_pages(struct drm_gem_shmem_object *shmem)
|
||||
{
|
||||
mutex_lock(&shmem->pages_lock);
|
||||
drm_gem_shmem_put_pages_locked(shmem);
|
||||
mutex_unlock(&shmem->pages_lock);
|
||||
}
|
||||
EXPORT_SYMBOL(drm_gem_shmem_put_pages);
|
||||
|
||||
/**
|
||||
* drm_gem_shmem_pin - Pin backing pages for a shmem GEM object
|
||||
* @obj: GEM object
|
||||
*
|
||||
* This function makes sure the backing pages are pinned in memory while the
|
||||
* buffer is exported.
|
||||
*
|
||||
* Returns:
|
||||
* 0 on success or a negative error code on failure.
|
||||
*/
|
||||
int drm_gem_shmem_pin(struct drm_gem_object *obj)
|
||||
{
|
||||
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
|
||||
|
||||
return drm_gem_shmem_get_pages(shmem);
|
||||
}
|
||||
EXPORT_SYMBOL(drm_gem_shmem_pin);
|
||||
|
||||
/**
|
||||
* drm_gem_shmem_unpin - Unpin backing pages for a shmem GEM object
|
||||
* @obj: GEM object
|
||||
*
|
||||
* This function removes the requirement that the backing pages are pinned in
|
||||
* memory.
|
||||
*/
|
||||
void drm_gem_shmem_unpin(struct drm_gem_object *obj)
|
||||
{
|
||||
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
|
||||
|
||||
drm_gem_shmem_put_pages(shmem);
|
||||
}
|
||||
EXPORT_SYMBOL(drm_gem_shmem_unpin);
|
||||
|
||||
static void *drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem)
|
||||
{
|
||||
struct drm_gem_object *obj = &shmem->base;
|
||||
int ret;
|
||||
|
||||
if (shmem->vmap_use_count++ > 0)
|
||||
return shmem->vaddr;
|
||||
|
||||
ret = drm_gem_shmem_get_pages(shmem);
|
||||
if (ret)
|
||||
goto err_zero_use;
|
||||
|
||||
if (obj->import_attach)
|
||||
shmem->vaddr = dma_buf_vmap(obj->import_attach->dmabuf);
|
||||
else
|
||||
shmem->vaddr = vmap(shmem->pages, obj->size >> PAGE_SHIFT, VM_MAP, PAGE_KERNEL);
|
||||
|
||||
if (!shmem->vaddr) {
|
||||
DRM_DEBUG_KMS("Failed to vmap pages\n");
|
||||
ret = -ENOMEM;
|
||||
goto err_put_pages;
|
||||
}
|
||||
|
||||
return shmem->vaddr;
|
||||
|
||||
err_put_pages:
|
||||
drm_gem_shmem_put_pages(shmem);
|
||||
err_zero_use:
|
||||
shmem->vmap_use_count = 0;
|
||||
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
/*
|
||||
* drm_gem_shmem_vmap - Create a virtual mapping for a shmem GEM object
|
||||
* @shmem: shmem GEM object
|
||||
*
|
||||
* This function makes sure that a virtual address exists for the buffer backing
|
||||
* the shmem GEM object.
|
||||
*
|
||||
* Returns:
|
||||
* 0 on success or a negative error code on failure.
|
||||
*/
|
||||
void *drm_gem_shmem_vmap(struct drm_gem_object *obj)
|
||||
{
|
||||
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
|
||||
void *vaddr;
|
||||
int ret;
|
||||
|
||||
ret = mutex_lock_interruptible(&shmem->vmap_lock);
|
||||
if (ret)
|
||||
return ERR_PTR(ret);
|
||||
vaddr = drm_gem_shmem_vmap_locked(shmem);
|
||||
mutex_unlock(&shmem->vmap_lock);
|
||||
|
||||
return vaddr;
|
||||
}
|
||||
EXPORT_SYMBOL(drm_gem_shmem_vmap);
|
||||
|
||||
static void drm_gem_shmem_vunmap_locked(struct drm_gem_shmem_object *shmem)
|
||||
{
|
||||
struct drm_gem_object *obj = &shmem->base;
|
||||
|
||||
if (WARN_ON_ONCE(!shmem->vmap_use_count))
|
||||
return;
|
||||
|
||||
if (--shmem->vmap_use_count > 0)
|
||||
return;
|
||||
|
||||
if (obj->import_attach)
|
||||
dma_buf_vunmap(obj->import_attach->dmabuf, shmem->vaddr);
|
||||
else
|
||||
vunmap(shmem->vaddr);
|
||||
|
||||
shmem->vaddr = NULL;
|
||||
drm_gem_shmem_put_pages(shmem);
|
||||
}
|
||||
|
||||
/*
|
||||
* drm_gem_shmem_vunmap - Unmap a virtual mapping fo a shmem GEM object
|
||||
* @shmem: shmem GEM object
|
||||
*
|
||||
* This function removes the virtual address when use count drops to zero.
|
||||
*/
|
||||
void drm_gem_shmem_vunmap(struct drm_gem_object *obj, void *vaddr)
|
||||
{
|
||||
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
|
||||
|
||||
mutex_lock(&shmem->vmap_lock);
|
||||
drm_gem_shmem_vunmap_locked(shmem);
|
||||
mutex_unlock(&shmem->vmap_lock);
|
||||
}
|
||||
EXPORT_SYMBOL(drm_gem_shmem_vunmap);
|
||||
|
||||
struct drm_gem_shmem_object *
|
||||
drm_gem_shmem_create_with_handle(struct drm_file *file_priv,
|
||||
struct drm_device *dev, size_t size,
|
||||
uint32_t *handle)
|
||||
{
|
||||
struct drm_gem_shmem_object *shmem;
|
||||
int ret;
|
||||
|
||||
shmem = drm_gem_shmem_create(dev, size);
|
||||
if (IS_ERR(shmem))
|
||||
return shmem;
|
||||
|
||||
/*
|
||||
* Allocate an 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, &shmem->base, handle);
|
||||
/* drop reference from allocate - handle holds it now. */
|
||||
drm_gem_object_put_unlocked(&shmem->base);
|
||||
if (ret)
|
||||
return ERR_PTR(ret);
|
||||
|
||||
return shmem;
|
||||
}
|
||||
EXPORT_SYMBOL(drm_gem_shmem_create_with_handle);
|
||||
|
||||
/**
|
||||
* drm_gem_shmem_dumb_create - Create a dumb shmem buffer object
|
||||
* @file: DRM file structure to create the dumb buffer for
|
||||
* @dev: 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 before calling into this function.
|
||||
*
|
||||
* Returns:
|
||||
* 0 on success or a negative error code on failure.
|
||||
*/
|
||||
int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev,
|
||||
struct drm_mode_create_dumb *args)
|
||||
{
|
||||
u32 min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
|
||||
struct drm_gem_shmem_object *shmem;
|
||||
|
||||
if (!args->pitch || !args->size) {
|
||||
args->pitch = min_pitch;
|
||||
args->size = args->pitch * args->height;
|
||||
} else {
|
||||
/* ensure sane minimum values */
|
||||
if (args->pitch < min_pitch)
|
||||
args->pitch = min_pitch;
|
||||
if (args->size < args->pitch * args->height)
|
||||
args->size = args->pitch * args->height;
|
||||
}
|
||||
|
||||
shmem = drm_gem_shmem_create_with_handle(file, dev, args->size, &args->handle);
|
||||
|
||||
return PTR_ERR_OR_ZERO(shmem);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(drm_gem_shmem_dumb_create);
|
||||
|
||||
static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
|
||||
{
|
||||
struct vm_area_struct *vma = vmf->vma;
|
||||
struct drm_gem_object *obj = vma->vm_private_data;
|
||||
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
|
||||
loff_t num_pages = obj->size >> PAGE_SHIFT;
|
||||
struct page *page;
|
||||
|
||||
if (vmf->pgoff > num_pages || WARN_ON_ONCE(!shmem->pages))
|
||||
return VM_FAULT_SIGBUS;
|
||||
|
||||
page = shmem->pages[vmf->pgoff];
|
||||
|
||||
return vmf_insert_page(vma, vmf->address, page);
|
||||
}
|
||||
|
||||
static void drm_gem_shmem_vm_open(struct vm_area_struct *vma)
|
||||
{
|
||||
struct drm_gem_object *obj = vma->vm_private_data;
|
||||
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
|
||||
int ret;
|
||||
|
||||
ret = drm_gem_shmem_get_pages(shmem);
|
||||
WARN_ON_ONCE(ret != 0);
|
||||
|
||||
drm_gem_vm_open(vma);
|
||||
}
|
||||
|
||||
static void drm_gem_shmem_vm_close(struct vm_area_struct *vma)
|
||||
{
|
||||
struct drm_gem_object *obj = vma->vm_private_data;
|
||||
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
|
||||
|
||||
drm_gem_shmem_put_pages(shmem);
|
||||
drm_gem_vm_close(vma);
|
||||
}
|
||||
|
||||
const struct vm_operations_struct drm_gem_shmem_vm_ops = {
|
||||
.fault = drm_gem_shmem_fault,
|
||||
.open = drm_gem_shmem_vm_open,
|
||||
.close = drm_gem_shmem_vm_close,
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(drm_gem_shmem_vm_ops);
|
||||
|
||||
/**
|
||||
* drm_gem_shmem_mmap - Memory-map a shmem 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 shmem objects. Drivers which employ the shmem helpers should
|
||||
* use this function as their &file_operations.mmap handler in the DRM device file's
|
||||
* file_operations structure.
|
||||
*
|
||||
* Instead of directly referencing this function, drivers should use the
|
||||
* DEFINE_DRM_GEM_SHMEM_FOPS() macro.
|
||||
*
|
||||
* Returns:
|
||||
* 0 on success or a negative error code on failure.
|
||||
*/
|
||||
int drm_gem_shmem_mmap(struct file *filp, struct vm_area_struct *vma)
|
||||
{
|
||||
struct drm_gem_shmem_object *shmem;
|
||||
int ret;
|
||||
|
||||
ret = drm_gem_mmap(filp, vma);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
shmem = to_drm_gem_shmem_obj(vma->vm_private_data);
|
||||
|
||||
ret = drm_gem_shmem_get_pages(shmem);
|
||||
if (ret) {
|
||||
drm_gem_vm_close(vma);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* VM_PFNMAP was set by drm_gem_mmap() */
|
||||
vma->vm_flags &= ~VM_PFNMAP;
|
||||
vma->vm_flags |= VM_MIXEDMAP;
|
||||
|
||||
/* Remove the fake offset */
|
||||
vma->vm_pgoff -= drm_vma_node_start(&shmem->base.vma_node);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(drm_gem_shmem_mmap);
|
||||
|
||||
/**
|
||||
* drm_gem_shmem_print_info() - Print &drm_gem_shmem_object info for debugfs
|
||||
* @p: DRM printer
|
||||
* @indent: Tab indentation level
|
||||
* @obj: GEM object
|
||||
*/
|
||||
void drm_gem_shmem_print_info(struct drm_printer *p, unsigned int indent,
|
||||
const struct drm_gem_object *obj)
|
||||
{
|
||||
const struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
|
||||
|
||||
drm_printf_indent(p, indent, "pages_use_count=%u\n", shmem->pages_use_count);
|
||||
drm_printf_indent(p, indent, "vmap_use_count=%u\n", shmem->vmap_use_count);
|
||||
drm_printf_indent(p, indent, "vaddr=%p\n", shmem->vaddr);
|
||||
}
|
||||
EXPORT_SYMBOL(drm_gem_shmem_print_info);
|
||||
|
||||
/**
|
||||
* drm_gem_shmem_get_sg_table - Provide a scatter/gather table of pinned
|
||||
* pages for a shmem GEM object
|
||||
* @obj: GEM object
|
||||
*
|
||||
* This function exports a scatter/gather table suitable for PRIME usage by
|
||||
* calling the standard DMA mapping API.
|
||||
*
|
||||
* Returns:
|
||||
* A pointer to the scatter/gather table of pinned pages or NULL on failure.
|
||||
*/
|
||||
struct sg_table *drm_gem_shmem_get_sg_table(struct drm_gem_object *obj)
|
||||
{
|
||||
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
|
||||
|
||||
return drm_prime_pages_to_sg(shmem->pages, obj->size >> PAGE_SHIFT);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(drm_gem_shmem_get_sg_table);
|
||||
|
||||
/**
|
||||
* drm_gem_shmem_get_pages_sgt - Pin pages, dma map them, and return a
|
||||
* scatter/gather table for a shmem GEM object.
|
||||
* @obj: GEM object
|
||||
*
|
||||
* This function returns a scatter/gather table suitable for driver usage. If
|
||||
* the sg table doesn't exist, the pages are pinned, dma-mapped, and a sg
|
||||
* table created.
|
||||
*
|
||||
* Returns:
|
||||
* A pointer to the scatter/gather table of pinned pages or errno on failure.
|
||||
*/
|
||||
struct sg_table *drm_gem_shmem_get_pages_sgt(struct drm_gem_object *obj)
|
||||
{
|
||||
int ret;
|
||||
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
|
||||
struct sg_table *sgt;
|
||||
|
||||
if (shmem->sgt)
|
||||
return shmem->sgt;
|
||||
|
||||
WARN_ON(obj->import_attach);
|
||||
|
||||
ret = drm_gem_shmem_get_pages(shmem);
|
||||
if (ret)
|
||||
return ERR_PTR(ret);
|
||||
|
||||
sgt = drm_gem_shmem_get_sg_table(&shmem->base);
|
||||
if (IS_ERR(sgt)) {
|
||||
ret = PTR_ERR(sgt);
|
||||
goto err_put_pages;
|
||||
}
|
||||
/* Map the pages for use by the h/w. */
|
||||
dma_map_sg(obj->dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
|
||||
|
||||
shmem->sgt = sgt;
|
||||
|
||||
return sgt;
|
||||
|
||||
err_put_pages:
|
||||
drm_gem_shmem_put_pages(shmem);
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(drm_gem_shmem_get_pages_sgt);
|
||||
|
||||
/**
|
||||
* drm_gem_shmem_prime_import_sg_table - Produce a shmem 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. Drivers that use the shmem 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_shmem_prime_import_sg_table(struct drm_device *dev,
|
||||
struct dma_buf_attachment *attach,
|
||||
struct sg_table *sgt)
|
||||
{
|
||||
size_t size = PAGE_ALIGN(attach->dmabuf->size);
|
||||
size_t npages = size >> PAGE_SHIFT;
|
||||
struct drm_gem_shmem_object *shmem;
|
||||
int ret;
|
||||
|
||||
shmem = drm_gem_shmem_create(dev, size);
|
||||
if (IS_ERR(shmem))
|
||||
return ERR_CAST(shmem);
|
||||
|
||||
shmem->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
|
||||
if (!shmem->pages) {
|
||||
ret = -ENOMEM;
|
||||
goto err_free_gem;
|
||||
}
|
||||
|
||||
ret = drm_prime_sg_to_page_addr_arrays(sgt, shmem->pages, NULL, npages);
|
||||
if (ret < 0)
|
||||
goto err_free_array;
|
||||
|
||||
shmem->sgt = sgt;
|
||||
shmem->pages_use_count = 1; /* Permanently pinned from our point of view */
|
||||
|
||||
DRM_DEBUG_PRIME("size = %zu\n", size);
|
||||
|
||||
return &shmem->base;
|
||||
|
||||
err_free_array:
|
||||
kvfree(shmem->pages);
|
||||
err_free_gem:
|
||||
drm_gem_object_put_unlocked(&shmem->base);
|
||||
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(drm_gem_shmem_prime_import_sg_table);
|
||||
|
|
@ -0,0 +1,159 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
|
||||
#ifndef __DRM_GEM_SHMEM_HELPER_H__
|
||||
#define __DRM_GEM_SHMEM_HELPER_H__
|
||||
|
||||
#include <linux/fs.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/mutex.h>
|
||||
|
||||
#include <drm/drm_file.h>
|
||||
#include <drm/drm_gem.h>
|
||||
#include <drm/drm_ioctl.h>
|
||||
#include <drm/drm_prime.h>
|
||||
|
||||
struct dma_buf_attachment;
|
||||
struct drm_mode_create_dumb;
|
||||
struct drm_printer;
|
||||
struct sg_table;
|
||||
|
||||
/**
|
||||
* struct drm_gem_shmem_object - GEM object backed by shmem
|
||||
*/
|
||||
struct drm_gem_shmem_object {
|
||||
/**
|
||||
* @base: Base GEM object
|
||||
*/
|
||||
struct drm_gem_object base;
|
||||
|
||||
/**
|
||||
* @pages_lock: Protects the page table and use count
|
||||
*/
|
||||
struct mutex pages_lock;
|
||||
|
||||
/**
|
||||
* @pages: Page table
|
||||
*/
|
||||
struct page **pages;
|
||||
|
||||
/**
|
||||
* @pages_use_count:
|
||||
*
|
||||
* Reference count on the pages table.
|
||||
* The pages are put when the count reaches zero.
|
||||
*/
|
||||
unsigned int pages_use_count;
|
||||
|
||||
/**
|
||||
* @pages_mark_dirty_on_put:
|
||||
*
|
||||
* Mark pages as dirty when they are put.
|
||||
*/
|
||||
unsigned int pages_mark_dirty_on_put : 1;
|
||||
|
||||
/**
|
||||
* @pages_mark_accessed_on_put:
|
||||
*
|
||||
* Mark pages as accessed when they are put.
|
||||
*/
|
||||
unsigned int pages_mark_accessed_on_put : 1;
|
||||
|
||||
/**
|
||||
* @sgt: Scatter/gather table for imported PRIME buffers
|
||||
*/
|
||||
struct sg_table *sgt;
|
||||
|
||||
/**
|
||||
* @vmap_lock: Protects the vmap address and use count
|
||||
*/
|
||||
struct mutex vmap_lock;
|
||||
|
||||
/**
|
||||
* @vaddr: Kernel virtual address of the backing memory
|
||||
*/
|
||||
void *vaddr;
|
||||
|
||||
/**
|
||||
* @vmap_use_count:
|
||||
*
|
||||
* Reference count on the virtual address.
|
||||
* The address are un-mapped when the count reaches zero.
|
||||
*/
|
||||
unsigned int vmap_use_count;
|
||||
};
|
||||
|
||||
#define to_drm_gem_shmem_obj(obj) \
|
||||
container_of(obj, struct drm_gem_shmem_object, base)
|
||||
|
||||
/**
|
||||
* DEFINE_DRM_GEM_SHMEM_FOPS() - Macro to generate file operations for shmem drivers
|
||||
* @name: name for the generated structure
|
||||
*
|
||||
* This macro autogenerates a suitable &struct file_operations for shmem based
|
||||
* drivers, which can be assigned to &drm_driver.fops. Note that this structure
|
||||
* cannot be shared between drivers, because it contains a reference to the
|
||||
* current module using THIS_MODULE.
|
||||
*
|
||||
* Note that the declaration is already marked as static - if you need a
|
||||
* non-static version of this you're probably doing it wrong and will break the
|
||||
* THIS_MODULE reference by accident.
|
||||
*/
|
||||
#define DEFINE_DRM_GEM_SHMEM_FOPS(name) \
|
||||
static const struct file_operations name = {\
|
||||
.owner = THIS_MODULE,\
|
||||
.open = drm_open,\
|
||||
.release = drm_release,\
|
||||
.unlocked_ioctl = drm_ioctl,\
|
||||
.compat_ioctl = drm_compat_ioctl,\
|
||||
.poll = drm_poll,\
|
||||
.read = drm_read,\
|
||||
.llseek = noop_llseek,\
|
||||
.mmap = drm_gem_shmem_mmap, \
|
||||
}
|
||||
|
||||
struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, size_t size);
|
||||
void drm_gem_shmem_free_object(struct drm_gem_object *obj);
|
||||
|
||||
int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem);
|
||||
void drm_gem_shmem_put_pages(struct drm_gem_shmem_object *shmem);
|
||||
int drm_gem_shmem_pin(struct drm_gem_object *obj);
|
||||
void drm_gem_shmem_unpin(struct drm_gem_object *obj);
|
||||
void *drm_gem_shmem_vmap(struct drm_gem_object *obj);
|
||||
void drm_gem_shmem_vunmap(struct drm_gem_object *obj, void *vaddr);
|
||||
|
||||
struct drm_gem_shmem_object *
|
||||
drm_gem_shmem_create_with_handle(struct drm_file *file_priv,
|
||||
struct drm_device *dev, size_t size,
|
||||
uint32_t *handle);
|
||||
int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev,
|
||||
struct drm_mode_create_dumb *args);
|
||||
|
||||
int drm_gem_shmem_mmap(struct file *filp, struct vm_area_struct *vma);
|
||||
|
||||
extern const struct vm_operations_struct drm_gem_shmem_vm_ops;
|
||||
|
||||
void drm_gem_shmem_print_info(struct drm_printer *p, unsigned int indent,
|
||||
const struct drm_gem_object *obj);
|
||||
|
||||
struct sg_table *drm_gem_shmem_get_sg_table(struct drm_gem_object *obj);
|
||||
struct drm_gem_object *
|
||||
drm_gem_shmem_prime_import_sg_table(struct drm_device *dev,
|
||||
struct dma_buf_attachment *attach,
|
||||
struct sg_table *sgt);
|
||||
|
||||
struct sg_table *drm_gem_shmem_get_pages_sgt(struct drm_gem_object *obj);
|
||||
|
||||
/**
|
||||
* DRM_GEM_SHMEM_DRIVER_OPS - Default shmem GEM operations
|
||||
*
|
||||
* This macro provides a shortcut for setting the shmem GEM operations in
|
||||
* the &drm_driver structure.
|
||||
*/
|
||||
#define DRM_GEM_SHMEM_DRIVER_OPS \
|
||||
.prime_handle_to_fd = drm_gem_prime_handle_to_fd, \
|
||||
.prime_fd_to_handle = drm_gem_prime_fd_to_handle, \
|
||||
.gem_prime_import_sg_table = drm_gem_shmem_prime_import_sg_table, \
|
||||
.gem_prime_mmap = drm_gem_prime_mmap, \
|
||||
.dumb_create = drm_gem_shmem_dumb_create
|
||||
|
||||
#endif /* __DRM_GEM_SHMEM_HELPER_H__ */
|
||||
Loading…
Reference in New Issue