OpenCloudOS-Kernel/drivers/gpu/drm/nouveau/nouveau_dmem.c

708 lines
17 KiB
C

/*
* Copyright 2018 Red Hat Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include "nouveau_dmem.h"
#include "nouveau_drv.h"
#include "nouveau_chan.h"
#include "nouveau_dma.h"
#include "nouveau_mem.h"
#include "nouveau_bo.h"
#include <nvif/class.h>
#include <nvif/object.h>
#include <nvif/if500b.h>
#include <nvif/if900b.h>
#include <linux/sched/mm.h>
#include <linux/hmm.h>
/*
* FIXME: this is ugly right now we are using TTM to allocate vram and we pin
* it in vram while in use. We likely want to overhaul memory management for
* nouveau to be more page like (not necessarily with system page size but a
* bigger page size) at lowest level and have some shim layer on top that would
* provide the same functionality as TTM.
*/
#define DMEM_CHUNK_SIZE (2UL << 20)
#define DMEM_CHUNK_NPAGES (DMEM_CHUNK_SIZE >> PAGE_SHIFT)
enum nouveau_aper {
NOUVEAU_APER_VIRT,
NOUVEAU_APER_VRAM,
NOUVEAU_APER_HOST,
};
typedef int (*nouveau_migrate_copy_t)(struct nouveau_drm *drm, u64 npages,
enum nouveau_aper, u64 dst_addr,
enum nouveau_aper, u64 src_addr);
struct nouveau_dmem_chunk {
struct list_head list;
struct nouveau_bo *bo;
struct nouveau_drm *drm;
unsigned long pfn_first;
unsigned long callocated;
unsigned long bitmap[BITS_TO_LONGS(DMEM_CHUNK_NPAGES)];
spinlock_t lock;
};
struct nouveau_dmem_migrate {
nouveau_migrate_copy_t copy_func;
struct nouveau_channel *chan;
};
struct nouveau_dmem {
struct nouveau_drm *drm;
struct dev_pagemap pagemap;
struct nouveau_dmem_migrate migrate;
struct list_head chunk_free;
struct list_head chunk_full;
struct list_head chunk_empty;
struct mutex mutex;
};
static inline struct nouveau_dmem *page_to_dmem(struct page *page)
{
return container_of(page->pgmap, struct nouveau_dmem, pagemap);
}
static unsigned long nouveau_dmem_page_addr(struct page *page)
{
struct nouveau_dmem_chunk *chunk = page->zone_device_data;
unsigned long idx = page_to_pfn(page) - chunk->pfn_first;
return (idx << PAGE_SHIFT) + chunk->bo->bo.offset;
}
static void nouveau_dmem_page_free(struct page *page)
{
struct nouveau_dmem_chunk *chunk = page->zone_device_data;
unsigned long idx = page_to_pfn(page) - chunk->pfn_first;
/*
* FIXME:
*
* This is really a bad example, we need to overhaul nouveau memory
* management to be more page focus and allow lighter locking scheme
* to be use in the process.
*/
spin_lock(&chunk->lock);
clear_bit(idx, chunk->bitmap);
WARN_ON(!chunk->callocated);
chunk->callocated--;
/*
* FIXME when chunk->callocated reach 0 we should add the chunk to
* a reclaim list so that it can be freed in case of memory pressure.
*/
spin_unlock(&chunk->lock);
}
static void nouveau_dmem_fence_done(struct nouveau_fence **fence)
{
if (fence) {
nouveau_fence_wait(*fence, true, false);
nouveau_fence_unref(fence);
} else {
/*
* FIXME wait for channel to be IDLE before calling finalizing
* the hmem object.
*/
}
}
static vm_fault_t nouveau_dmem_fault_copy_one(struct nouveau_drm *drm,
struct vm_fault *vmf, struct migrate_vma *args,
dma_addr_t *dma_addr)
{
struct device *dev = drm->dev->dev;
struct page *dpage, *spage;
spage = migrate_pfn_to_page(args->src[0]);
if (!spage || !(args->src[0] & MIGRATE_PFN_MIGRATE))
return 0;
dpage = alloc_page_vma(GFP_HIGHUSER, vmf->vma, vmf->address);
if (!dpage)
return VM_FAULT_SIGBUS;
lock_page(dpage);
*dma_addr = dma_map_page(dev, dpage, 0, PAGE_SIZE, DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, *dma_addr))
goto error_free_page;
if (drm->dmem->migrate.copy_func(drm, 1, NOUVEAU_APER_HOST, *dma_addr,
NOUVEAU_APER_VRAM, nouveau_dmem_page_addr(spage)))
goto error_dma_unmap;
args->dst[0] = migrate_pfn(page_to_pfn(dpage)) | MIGRATE_PFN_LOCKED;
return 0;
error_dma_unmap:
dma_unmap_page(dev, *dma_addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
error_free_page:
__free_page(dpage);
return VM_FAULT_SIGBUS;
}
static vm_fault_t nouveau_dmem_migrate_to_ram(struct vm_fault *vmf)
{
struct nouveau_dmem *dmem = page_to_dmem(vmf->page);
struct nouveau_drm *drm = dmem->drm;
struct nouveau_fence *fence;
unsigned long src = 0, dst = 0;
dma_addr_t dma_addr = 0;
vm_fault_t ret;
struct migrate_vma args = {
.vma = vmf->vma,
.start = vmf->address,
.end = vmf->address + PAGE_SIZE,
.src = &src,
.dst = &dst,
};
/*
* FIXME what we really want is to find some heuristic to migrate more
* than just one page on CPU fault. When such fault happens it is very
* likely that more surrounding page will CPU fault too.
*/
if (migrate_vma_setup(&args) < 0)
return VM_FAULT_SIGBUS;
if (!args.cpages)
return 0;
ret = nouveau_dmem_fault_copy_one(drm, vmf, &args, &dma_addr);
if (ret || dst == 0)
goto done;
nouveau_fence_new(dmem->migrate.chan, false, &fence);
migrate_vma_pages(&args);
nouveau_dmem_fence_done(&fence);
dma_unmap_page(drm->dev->dev, dma_addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
done:
migrate_vma_finalize(&args);
return ret;
}
static const struct dev_pagemap_ops nouveau_dmem_pagemap_ops = {
.page_free = nouveau_dmem_page_free,
.migrate_to_ram = nouveau_dmem_migrate_to_ram,
};
static int
nouveau_dmem_chunk_alloc(struct nouveau_drm *drm)
{
struct nouveau_dmem_chunk *chunk;
int ret;
if (drm->dmem == NULL)
return -EINVAL;
mutex_lock(&drm->dmem->mutex);
chunk = list_first_entry_or_null(&drm->dmem->chunk_empty,
struct nouveau_dmem_chunk,
list);
if (chunk == NULL) {
mutex_unlock(&drm->dmem->mutex);
return -ENOMEM;
}
list_del(&chunk->list);
mutex_unlock(&drm->dmem->mutex);
ret = nouveau_bo_new(&drm->client, DMEM_CHUNK_SIZE, 0,
TTM_PL_FLAG_VRAM, 0, 0, NULL, NULL,
&chunk->bo);
if (ret)
goto out;
ret = nouveau_bo_pin(chunk->bo, TTM_PL_FLAG_VRAM, false);
if (ret) {
nouveau_bo_ref(NULL, &chunk->bo);
goto out;
}
bitmap_zero(chunk->bitmap, DMEM_CHUNK_NPAGES);
spin_lock_init(&chunk->lock);
out:
mutex_lock(&drm->dmem->mutex);
if (chunk->bo)
list_add(&chunk->list, &drm->dmem->chunk_empty);
else
list_add_tail(&chunk->list, &drm->dmem->chunk_empty);
mutex_unlock(&drm->dmem->mutex);
return ret;
}
static struct nouveau_dmem_chunk *
nouveau_dmem_chunk_first_free_locked(struct nouveau_drm *drm)
{
struct nouveau_dmem_chunk *chunk;
chunk = list_first_entry_or_null(&drm->dmem->chunk_free,
struct nouveau_dmem_chunk,
list);
if (chunk)
return chunk;
chunk = list_first_entry_or_null(&drm->dmem->chunk_empty,
struct nouveau_dmem_chunk,
list);
if (chunk->bo)
return chunk;
return NULL;
}
static int
nouveau_dmem_pages_alloc(struct nouveau_drm *drm,
unsigned long npages,
unsigned long *pages)
{
struct nouveau_dmem_chunk *chunk;
unsigned long c;
int ret;
memset(pages, 0xff, npages * sizeof(*pages));
mutex_lock(&drm->dmem->mutex);
for (c = 0; c < npages;) {
unsigned long i;
chunk = nouveau_dmem_chunk_first_free_locked(drm);
if (chunk == NULL) {
mutex_unlock(&drm->dmem->mutex);
ret = nouveau_dmem_chunk_alloc(drm);
if (ret) {
if (c)
return 0;
return ret;
}
mutex_lock(&drm->dmem->mutex);
continue;
}
spin_lock(&chunk->lock);
i = find_first_zero_bit(chunk->bitmap, DMEM_CHUNK_NPAGES);
while (i < DMEM_CHUNK_NPAGES && c < npages) {
pages[c] = chunk->pfn_first + i;
set_bit(i, chunk->bitmap);
chunk->callocated++;
c++;
i = find_next_zero_bit(chunk->bitmap,
DMEM_CHUNK_NPAGES, i);
}
spin_unlock(&chunk->lock);
}
mutex_unlock(&drm->dmem->mutex);
return 0;
}
static struct page *
nouveau_dmem_page_alloc_locked(struct nouveau_drm *drm)
{
unsigned long pfns[1];
struct page *page;
int ret;
/* FIXME stop all the miss-match API ... */
ret = nouveau_dmem_pages_alloc(drm, 1, pfns);
if (ret)
return NULL;
page = pfn_to_page(pfns[0]);
get_page(page);
lock_page(page);
return page;
}
static void
nouveau_dmem_page_free_locked(struct nouveau_drm *drm, struct page *page)
{
unlock_page(page);
put_page(page);
}
void
nouveau_dmem_resume(struct nouveau_drm *drm)
{
struct nouveau_dmem_chunk *chunk;
int ret;
if (drm->dmem == NULL)
return;
mutex_lock(&drm->dmem->mutex);
list_for_each_entry (chunk, &drm->dmem->chunk_free, list) {
ret = nouveau_bo_pin(chunk->bo, TTM_PL_FLAG_VRAM, false);
/* FIXME handle pin failure */
WARN_ON(ret);
}
list_for_each_entry (chunk, &drm->dmem->chunk_full, list) {
ret = nouveau_bo_pin(chunk->bo, TTM_PL_FLAG_VRAM, false);
/* FIXME handle pin failure */
WARN_ON(ret);
}
mutex_unlock(&drm->dmem->mutex);
}
void
nouveau_dmem_suspend(struct nouveau_drm *drm)
{
struct nouveau_dmem_chunk *chunk;
if (drm->dmem == NULL)
return;
mutex_lock(&drm->dmem->mutex);
list_for_each_entry (chunk, &drm->dmem->chunk_free, list) {
nouveau_bo_unpin(chunk->bo);
}
list_for_each_entry (chunk, &drm->dmem->chunk_full, list) {
nouveau_bo_unpin(chunk->bo);
}
mutex_unlock(&drm->dmem->mutex);
}
void
nouveau_dmem_fini(struct nouveau_drm *drm)
{
struct nouveau_dmem_chunk *chunk, *tmp;
if (drm->dmem == NULL)
return;
mutex_lock(&drm->dmem->mutex);
WARN_ON(!list_empty(&drm->dmem->chunk_free));
WARN_ON(!list_empty(&drm->dmem->chunk_full));
list_for_each_entry_safe (chunk, tmp, &drm->dmem->chunk_empty, list) {
if (chunk->bo) {
nouveau_bo_unpin(chunk->bo);
nouveau_bo_ref(NULL, &chunk->bo);
}
list_del(&chunk->list);
kfree(chunk);
}
mutex_unlock(&drm->dmem->mutex);
}
static int
nvc0b5_migrate_copy(struct nouveau_drm *drm, u64 npages,
enum nouveau_aper dst_aper, u64 dst_addr,
enum nouveau_aper src_aper, u64 src_addr)
{
struct nouveau_channel *chan = drm->dmem->migrate.chan;
u32 launch_dma = (1 << 9) /* MULTI_LINE_ENABLE. */ |
(1 << 8) /* DST_MEMORY_LAYOUT_PITCH. */ |
(1 << 7) /* SRC_MEMORY_LAYOUT_PITCH. */ |
(1 << 2) /* FLUSH_ENABLE_TRUE. */ |
(2 << 0) /* DATA_TRANSFER_TYPE_NON_PIPELINED. */;
int ret;
ret = RING_SPACE(chan, 13);
if (ret)
return ret;
if (src_aper != NOUVEAU_APER_VIRT) {
switch (src_aper) {
case NOUVEAU_APER_VRAM:
BEGIN_IMC0(chan, NvSubCopy, 0x0260, 0);
break;
case NOUVEAU_APER_HOST:
BEGIN_IMC0(chan, NvSubCopy, 0x0260, 1);
break;
default:
return -EINVAL;
}
launch_dma |= 0x00001000; /* SRC_TYPE_PHYSICAL. */
}
if (dst_aper != NOUVEAU_APER_VIRT) {
switch (dst_aper) {
case NOUVEAU_APER_VRAM:
BEGIN_IMC0(chan, NvSubCopy, 0x0264, 0);
break;
case NOUVEAU_APER_HOST:
BEGIN_IMC0(chan, NvSubCopy, 0x0264, 1);
break;
default:
return -EINVAL;
}
launch_dma |= 0x00002000; /* DST_TYPE_PHYSICAL. */
}
BEGIN_NVC0(chan, NvSubCopy, 0x0400, 8);
OUT_RING (chan, upper_32_bits(src_addr));
OUT_RING (chan, lower_32_bits(src_addr));
OUT_RING (chan, upper_32_bits(dst_addr));
OUT_RING (chan, lower_32_bits(dst_addr));
OUT_RING (chan, PAGE_SIZE);
OUT_RING (chan, PAGE_SIZE);
OUT_RING (chan, PAGE_SIZE);
OUT_RING (chan, npages);
BEGIN_NVC0(chan, NvSubCopy, 0x0300, 1);
OUT_RING (chan, launch_dma);
return 0;
}
static int
nouveau_dmem_migrate_init(struct nouveau_drm *drm)
{
switch (drm->ttm.copy.oclass) {
case PASCAL_DMA_COPY_A:
case PASCAL_DMA_COPY_B:
case VOLTA_DMA_COPY_A:
case TURING_DMA_COPY_A:
drm->dmem->migrate.copy_func = nvc0b5_migrate_copy;
drm->dmem->migrate.chan = drm->ttm.chan;
return 0;
default:
break;
}
return -ENODEV;
}
void
nouveau_dmem_init(struct nouveau_drm *drm)
{
struct device *device = drm->dev->dev;
struct resource *res;
unsigned long i, size, pfn_first;
int ret;
/* This only make sense on PASCAL or newer */
if (drm->client.device.info.family < NV_DEVICE_INFO_V0_PASCAL)
return;
if (!(drm->dmem = kzalloc(sizeof(*drm->dmem), GFP_KERNEL)))
return;
drm->dmem->drm = drm;
mutex_init(&drm->dmem->mutex);
INIT_LIST_HEAD(&drm->dmem->chunk_free);
INIT_LIST_HEAD(&drm->dmem->chunk_full);
INIT_LIST_HEAD(&drm->dmem->chunk_empty);
size = ALIGN(drm->client.device.info.ram_user, DMEM_CHUNK_SIZE);
/* Initialize migration dma helpers before registering memory */
ret = nouveau_dmem_migrate_init(drm);
if (ret)
goto out_free;
/*
* FIXME we need some kind of policy to decide how much VRAM we
* want to register with HMM. For now just register everything
* and latter if we want to do thing like over commit then we
* could revisit this.
*/
res = devm_request_free_mem_region(device, &iomem_resource, size);
if (IS_ERR(res))
goto out_free;
drm->dmem->pagemap.type = MEMORY_DEVICE_PRIVATE;
drm->dmem->pagemap.res = *res;
drm->dmem->pagemap.ops = &nouveau_dmem_pagemap_ops;
if (IS_ERR(devm_memremap_pages(device, &drm->dmem->pagemap)))
goto out_free;
pfn_first = res->start >> PAGE_SHIFT;
for (i = 0; i < (size / DMEM_CHUNK_SIZE); ++i) {
struct nouveau_dmem_chunk *chunk;
struct page *page;
unsigned long j;
chunk = kzalloc(sizeof(*chunk), GFP_KERNEL);
if (chunk == NULL) {
nouveau_dmem_fini(drm);
return;
}
chunk->drm = drm;
chunk->pfn_first = pfn_first + (i * DMEM_CHUNK_NPAGES);
list_add_tail(&chunk->list, &drm->dmem->chunk_empty);
page = pfn_to_page(chunk->pfn_first);
for (j = 0; j < DMEM_CHUNK_NPAGES; ++j, ++page)
page->zone_device_data = chunk;
}
NV_INFO(drm, "DMEM: registered %ldMB of device memory\n", size >> 20);
return;
out_free:
kfree(drm->dmem);
drm->dmem = NULL;
}
static unsigned long nouveau_dmem_migrate_copy_one(struct nouveau_drm *drm,
unsigned long src, dma_addr_t *dma_addr)
{
struct device *dev = drm->dev->dev;
struct page *dpage, *spage;
spage = migrate_pfn_to_page(src);
if (!spage || !(src & MIGRATE_PFN_MIGRATE))
goto out;
dpage = nouveau_dmem_page_alloc_locked(drm);
if (!dpage)
return 0;
*dma_addr = dma_map_page(dev, spage, 0, PAGE_SIZE, DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, *dma_addr))
goto out_free_page;
if (drm->dmem->migrate.copy_func(drm, 1, NOUVEAU_APER_VRAM,
nouveau_dmem_page_addr(dpage), NOUVEAU_APER_HOST,
*dma_addr))
goto out_dma_unmap;
return migrate_pfn(page_to_pfn(dpage)) | MIGRATE_PFN_LOCKED;
out_dma_unmap:
dma_unmap_page(dev, *dma_addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
out_free_page:
nouveau_dmem_page_free_locked(drm, dpage);
out:
return 0;
}
static void nouveau_dmem_migrate_chunk(struct nouveau_drm *drm,
struct migrate_vma *args, dma_addr_t *dma_addrs)
{
struct nouveau_fence *fence;
unsigned long addr = args->start, nr_dma = 0, i;
for (i = 0; addr < args->end; i++) {
args->dst[i] = nouveau_dmem_migrate_copy_one(drm, args->src[i],
dma_addrs + nr_dma);
if (args->dst[i])
nr_dma++;
addr += PAGE_SIZE;
}
nouveau_fence_new(drm->dmem->migrate.chan, false, &fence);
migrate_vma_pages(args);
nouveau_dmem_fence_done(&fence);
while (nr_dma--) {
dma_unmap_page(drm->dev->dev, dma_addrs[nr_dma], PAGE_SIZE,
DMA_BIDIRECTIONAL);
}
/*
* FIXME optimization: update GPU page table to point to newly migrated
* memory.
*/
migrate_vma_finalize(args);
}
int
nouveau_dmem_migrate_vma(struct nouveau_drm *drm,
struct vm_area_struct *vma,
unsigned long start,
unsigned long end)
{
unsigned long npages = (end - start) >> PAGE_SHIFT;
unsigned long max = min(SG_MAX_SINGLE_ALLOC, npages);
dma_addr_t *dma_addrs;
struct migrate_vma args = {
.vma = vma,
.start = start,
};
unsigned long c, i;
int ret = -ENOMEM;
args.src = kcalloc(max, sizeof(*args.src), GFP_KERNEL);
if (!args.src)
goto out;
args.dst = kcalloc(max, sizeof(*args.dst), GFP_KERNEL);
if (!args.dst)
goto out_free_src;
dma_addrs = kmalloc_array(max, sizeof(*dma_addrs), GFP_KERNEL);
if (!dma_addrs)
goto out_free_dst;
for (i = 0; i < npages; i += c) {
c = min(SG_MAX_SINGLE_ALLOC, npages);
args.end = start + (c << PAGE_SHIFT);
ret = migrate_vma_setup(&args);
if (ret)
goto out_free_dma;
if (args.cpages)
nouveau_dmem_migrate_chunk(drm, &args, dma_addrs);
args.start = args.end;
}
ret = 0;
out_free_dma:
kfree(dma_addrs);
out_free_dst:
kfree(args.dst);
out_free_src:
kfree(args.src);
out:
return ret;
}
static inline bool
nouveau_dmem_page(struct nouveau_drm *drm, struct page *page)
{
return is_device_private_page(page) && drm->dmem == page_to_dmem(page);
}
void
nouveau_dmem_convert_pfn(struct nouveau_drm *drm,
struct hmm_range *range)
{
unsigned long i, npages;
npages = (range->end - range->start) >> PAGE_SHIFT;
for (i = 0; i < npages; ++i) {
struct page *page;
uint64_t addr;
page = hmm_device_entry_to_page(range, range->pfns[i]);
if (page == NULL)
continue;
if (!(range->pfns[i] & range->flags[HMM_PFN_DEVICE_PRIVATE])) {
continue;
}
if (!nouveau_dmem_page(drm, page)) {
WARN(1, "Some unknown device memory !\n");
range->pfns[i] = 0;
continue;
}
addr = nouveau_dmem_page_addr(page);
range->pfns[i] &= ((1UL << range->pfn_shift) - 1);
range->pfns[i] |= (addr >> PAGE_SHIFT) << range->pfn_shift;
}
}