linux-zen-desktop/drivers/gpu/drm/gma500/gem.c

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2023-08-30 17:31:07 +02:00
// SPDX-License-Identifier: GPL-2.0-only
/*
* psb GEM interface
*
* Copyright (c) 2011, Intel Corporation.
*
* Authors: Alan Cox
*
* TODO:
* - we need to work out if the MMU is relevant (eg for
* accelerated operations on a GEM object)
*/
#include <linux/pagemap.h>
#include <asm/set_memory.h>
#include <drm/drm.h>
#include <drm/drm_vma_manager.h>
#include "gem.h"
#include "psb_drv.h"
/*
* PSB GEM object
*/
int psb_gem_pin(struct psb_gem_object *pobj)
{
struct drm_gem_object *obj = &pobj->base;
struct drm_device *dev = obj->dev;
struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
u32 gpu_base = dev_priv->gtt.gatt_start;
struct page **pages;
unsigned int npages;
int ret;
ret = dma_resv_lock(obj->resv, NULL);
if (drm_WARN_ONCE(dev, ret, "dma_resv_lock() failed, ret=%d\n", ret))
return ret;
if (pobj->in_gart || pobj->stolen)
goto out; /* already mapped */
pages = drm_gem_get_pages(obj);
if (IS_ERR(pages)) {
ret = PTR_ERR(pages);
goto err_dma_resv_unlock;
}
npages = obj->size / PAGE_SIZE;
set_pages_array_wc(pages, npages);
psb_gtt_insert_pages(dev_priv, &pobj->resource, pages);
psb_mmu_insert_pages(psb_mmu_get_default_pd(dev_priv->mmu), pages,
(gpu_base + pobj->offset), npages, 0, 0,
PSB_MMU_CACHED_MEMORY);
pobj->pages = pages;
out:
++pobj->in_gart;
dma_resv_unlock(obj->resv);
return 0;
err_dma_resv_unlock:
dma_resv_unlock(obj->resv);
return ret;
}
void psb_gem_unpin(struct psb_gem_object *pobj)
{
struct drm_gem_object *obj = &pobj->base;
struct drm_device *dev = obj->dev;
struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
u32 gpu_base = dev_priv->gtt.gatt_start;
unsigned long npages;
int ret;
ret = dma_resv_lock(obj->resv, NULL);
if (drm_WARN_ONCE(dev, ret, "dma_resv_lock() failed, ret=%d\n", ret))
return;
WARN_ON(!pobj->in_gart);
--pobj->in_gart;
if (pobj->in_gart || pobj->stolen)
goto out;
npages = obj->size / PAGE_SIZE;
psb_mmu_remove_pages(psb_mmu_get_default_pd(dev_priv->mmu),
(gpu_base + pobj->offset), npages, 0, 0);
psb_gtt_remove_pages(dev_priv, &pobj->resource);
/* Reset caching flags */
set_pages_array_wb(pobj->pages, npages);
drm_gem_put_pages(obj, pobj->pages, true, false);
pobj->pages = NULL;
out:
dma_resv_unlock(obj->resv);
}
static vm_fault_t psb_gem_fault(struct vm_fault *vmf);
static void psb_gem_free_object(struct drm_gem_object *obj)
{
struct psb_gem_object *pobj = to_psb_gem_object(obj);
/* Undo the mmap pin if we are destroying the object */
if (pobj->mmapping)
psb_gem_unpin(pobj);
drm_gem_object_release(obj);
WARN_ON(pobj->in_gart && !pobj->stolen);
release_resource(&pobj->resource);
kfree(pobj);
}
static const struct vm_operations_struct psb_gem_vm_ops = {
.fault = psb_gem_fault,
.open = drm_gem_vm_open,
.close = drm_gem_vm_close,
};
static const struct drm_gem_object_funcs psb_gem_object_funcs = {
.free = psb_gem_free_object,
.vm_ops = &psb_gem_vm_ops,
};
struct psb_gem_object *
psb_gem_create(struct drm_device *dev, u64 size, const char *name, bool stolen, u32 align)
{
struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
struct psb_gem_object *pobj;
struct drm_gem_object *obj;
int ret;
size = roundup(size, PAGE_SIZE);
pobj = kzalloc(sizeof(*pobj), GFP_KERNEL);
if (!pobj)
return ERR_PTR(-ENOMEM);
obj = &pobj->base;
/* GTT resource */
ret = psb_gtt_allocate_resource(dev_priv, &pobj->resource, name, size, align, stolen,
&pobj->offset);
if (ret)
goto err_kfree;
if (stolen) {
pobj->stolen = true;
pobj->in_gart = 1;
}
/* GEM object */
obj->funcs = &psb_gem_object_funcs;
if (stolen) {
drm_gem_private_object_init(dev, obj, size);
} else {
ret = drm_gem_object_init(dev, obj, size);
if (ret)
goto err_release_resource;
/* Limit the object to 32-bit mappings */
mapping_set_gfp_mask(obj->filp->f_mapping, GFP_KERNEL | __GFP_DMA32);
}
return pobj;
err_release_resource:
release_resource(&pobj->resource);
err_kfree:
kfree(pobj);
return ERR_PTR(ret);
}
/**
* psb_gem_dumb_create - create a dumb buffer
* @file: our client file
* @dev: our device
* @args: the requested arguments copied from userspace
*
* Allocate a buffer suitable for use for a frame buffer of the
* form described by user space. Give userspace a handle by which
* to reference it.
*/
int psb_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
size_t pitch, size;
struct psb_gem_object *pobj;
struct drm_gem_object *obj;
u32 handle;
int ret;
pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
pitch = ALIGN(pitch, 64);
size = pitch * args->height;
size = roundup(size, PAGE_SIZE);
if (!size)
return -EINVAL;
pobj = psb_gem_create(dev, size, "gem", false, PAGE_SIZE);
if (IS_ERR(pobj))
return PTR_ERR(pobj);
obj = &pobj->base;
ret = drm_gem_handle_create(file, obj, &handle);
if (ret)
goto err_drm_gem_object_put;
drm_gem_object_put(obj);
args->pitch = pitch;
args->size = size;
args->handle = handle;
return 0;
err_drm_gem_object_put:
drm_gem_object_put(obj);
return ret;
}
/**
* psb_gem_fault - pagefault handler for GEM objects
* @vmf: fault detail
*
* Invoked when a fault occurs on an mmap of a GEM managed area. GEM
* does most of the work for us including the actual map/unmap calls
* but we need to do the actual page work.
*
* This code eventually needs to handle faulting objects in and out
* of the GTT and repacking it when we run out of space. We can put
* that off for now and for our simple uses
*
* The VMA was set up by GEM. In doing so it also ensured that the
* vma->vm_private_data points to the GEM object that is backing this
* mapping.
*/
static vm_fault_t psb_gem_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct drm_gem_object *obj;
struct psb_gem_object *pobj;
int err;
vm_fault_t ret;
unsigned long pfn;
pgoff_t page_offset;
struct drm_device *dev;
struct drm_psb_private *dev_priv;
obj = vma->vm_private_data; /* GEM object */
dev = obj->dev;
dev_priv = to_drm_psb_private(dev);
pobj = to_psb_gem_object(obj);
/* Make sure we don't parallel update on a fault, nor move or remove
something from beneath our feet */
mutex_lock(&dev_priv->mmap_mutex);
/* For now the mmap pins the object and it stays pinned. As things
stand that will do us no harm */
if (pobj->mmapping == 0) {
err = psb_gem_pin(pobj);
if (err < 0) {
dev_err(dev->dev, "gma500: pin failed: %d\n", err);
ret = vmf_error(err);
goto fail;
}
pobj->mmapping = 1;
}
/* Page relative to the VMA start - we must calculate this ourselves
because vmf->pgoff is the fake GEM offset */
page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
/* CPU view of the page, don't go via the GART for CPU writes */
if (pobj->stolen)
pfn = (dev_priv->stolen_base + pobj->offset) >> PAGE_SHIFT;
else
pfn = page_to_pfn(pobj->pages[page_offset]);
ret = vmf_insert_pfn(vma, vmf->address, pfn);
fail:
mutex_unlock(&dev_priv->mmap_mutex);
return ret;
}
/*
* Memory management
*/
/* Insert vram stolen pages into the GTT. */
static void psb_gem_mm_populate_stolen(struct drm_psb_private *pdev)
{
struct drm_device *dev = &pdev->dev;
unsigned int pfn_base;
unsigned int i, num_pages;
uint32_t pte;
pfn_base = pdev->stolen_base >> PAGE_SHIFT;
num_pages = pdev->vram_stolen_size >> PAGE_SHIFT;
drm_dbg(dev, "Set up %u stolen pages starting at 0x%08x, GTT offset %dK\n",
num_pages, pfn_base << PAGE_SHIFT, 0);
for (i = 0; i < num_pages; ++i) {
pte = psb_gtt_mask_pte(pfn_base + i, PSB_MMU_CACHED_MEMORY);
iowrite32(pte, pdev->gtt_map + i);
}
(void)ioread32(pdev->gtt_map + i - 1);
}
int psb_gem_mm_init(struct drm_device *dev)
{
struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
struct pci_dev *pdev = to_pci_dev(dev->dev);
unsigned long stolen_size, vram_stolen_size;
struct psb_gtt *pg;
int ret;
mutex_init(&dev_priv->mmap_mutex);
pg = &dev_priv->gtt;
pci_read_config_dword(pdev, PSB_BSM, &dev_priv->stolen_base);
vram_stolen_size = pg->gtt_phys_start - dev_priv->stolen_base - PAGE_SIZE;
stolen_size = vram_stolen_size;
dev_dbg(dev->dev, "Stolen memory base 0x%x, size %luK\n",
dev_priv->stolen_base, vram_stolen_size / 1024);
pg->stolen_size = stolen_size;
dev_priv->vram_stolen_size = vram_stolen_size;
dev_priv->vram_addr = ioremap_wc(dev_priv->stolen_base, stolen_size);
if (!dev_priv->vram_addr) {
dev_err(dev->dev, "Failure to map stolen base.\n");
ret = -ENOMEM;
goto err_mutex_destroy;
}
psb_gem_mm_populate_stolen(dev_priv);
return 0;
err_mutex_destroy:
mutex_destroy(&dev_priv->mmap_mutex);
return ret;
}
void psb_gem_mm_fini(struct drm_device *dev)
{
struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
iounmap(dev_priv->vram_addr);
mutex_destroy(&dev_priv->mmap_mutex);
}
/* Re-insert all pinned GEM objects into GTT. */
static void psb_gem_mm_populate_resources(struct drm_psb_private *pdev)
{
unsigned int restored = 0, total = 0, size = 0;
struct resource *r = pdev->gtt_mem->child;
struct drm_device *dev = &pdev->dev;
struct psb_gem_object *pobj;
while (r) {
/*
* TODO: GTT restoration needs a refactoring, so that we don't have to touch
* struct psb_gem_object here. The type represents a GEM object and is
* not related to the GTT itself.
*/
pobj = container_of(r, struct psb_gem_object, resource);
if (pobj->pages) {
psb_gtt_insert_pages(pdev, &pobj->resource, pobj->pages);
size += resource_size(&pobj->resource);
++restored;
}
r = r->sibling;
++total;
}
drm_dbg(dev, "Restored %u of %u gtt ranges (%u KB)", restored, total, (size / 1024));
}
int psb_gem_mm_resume(struct drm_device *dev)
{
struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
struct pci_dev *pdev = to_pci_dev(dev->dev);
unsigned long stolen_size, vram_stolen_size;
struct psb_gtt *pg;
pg = &dev_priv->gtt;
pci_read_config_dword(pdev, PSB_BSM, &dev_priv->stolen_base);
vram_stolen_size = pg->gtt_phys_start - dev_priv->stolen_base - PAGE_SIZE;
stolen_size = vram_stolen_size;
dev_dbg(dev->dev, "Stolen memory base 0x%x, size %luK\n", dev_priv->stolen_base,
vram_stolen_size / 1024);
if (stolen_size != pg->stolen_size) {
dev_err(dev->dev, "GTT resume error.\n");
return -EINVAL;
}
psb_gem_mm_populate_stolen(dev_priv);
psb_gem_mm_populate_resources(dev_priv);
return 0;
}