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// SPDX-License-Identifier: GPL-2.0 OR MIT
/* Copyright 2017-2019 Qiang Yu <yuq825@gmail.com> */
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include "lima_device.h"
#include "lima_vm.h"
#include "lima_gem.h"
#include "lima_regs.h"
struct lima_bo_va {
struct list_head list;
unsigned int ref_count;
struct drm_mm_node node;
struct lima_vm *vm;
};
#define LIMA_VM_PD_SHIFT 22
#define LIMA_VM_PT_SHIFT 12
#define LIMA_VM_PB_SHIFT (LIMA_VM_PD_SHIFT + LIMA_VM_NUM_PT_PER_BT_SHIFT)
#define LIMA_VM_BT_SHIFT LIMA_VM_PT_SHIFT
#define LIMA_VM_PT_MASK ((1 << LIMA_VM_PD_SHIFT) - 1)
#define LIMA_VM_BT_MASK ((1 << LIMA_VM_PB_SHIFT) - 1)
#define LIMA_PDE(va) (va >> LIMA_VM_PD_SHIFT)
#define LIMA_PTE(va) ((va & LIMA_VM_PT_MASK) >> LIMA_VM_PT_SHIFT)
#define LIMA_PBE(va) (va >> LIMA_VM_PB_SHIFT)
#define LIMA_BTE(va) ((va & LIMA_VM_BT_MASK) >> LIMA_VM_BT_SHIFT)
static void lima_vm_unmap_range(struct lima_vm *vm, u32 start, u32 end)
{
u32 addr;
for (addr = start; addr <= end; addr += LIMA_PAGE_SIZE) {
u32 pbe = LIMA_PBE(addr);
u32 bte = LIMA_BTE(addr);
vm->bts[pbe].cpu[bte] = 0;
}
}
static int lima_vm_map_page(struct lima_vm *vm, dma_addr_t pa, u32 va)
{
u32 pbe = LIMA_PBE(va);
u32 bte = LIMA_BTE(va);
if (!vm->bts[pbe].cpu) {
dma_addr_t pts;
u32 *pd;
int j;
vm->bts[pbe].cpu = dma_alloc_wc(
vm->dev->dev, LIMA_PAGE_SIZE << LIMA_VM_NUM_PT_PER_BT_SHIFT,
&vm->bts[pbe].dma, GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO);
if (!vm->bts[pbe].cpu)
return -ENOMEM;
pts = vm->bts[pbe].dma;
pd = vm->pd.cpu + (pbe << LIMA_VM_NUM_PT_PER_BT_SHIFT);
for (j = 0; j < LIMA_VM_NUM_PT_PER_BT; j++) {
pd[j] = pts | LIMA_VM_FLAG_PRESENT;
pts += LIMA_PAGE_SIZE;
}
}
vm->bts[pbe].cpu[bte] = pa | LIMA_VM_FLAGS_CACHE;
return 0;
}
static struct lima_bo_va *
lima_vm_bo_find(struct lima_vm *vm, struct lima_bo *bo)
{
struct lima_bo_va *bo_va, *ret = NULL;
list_for_each_entry(bo_va, &bo->va, list) {
if (bo_va->vm == vm) {
ret = bo_va;
break;
}
}
return ret;
}
int lima_vm_bo_add(struct lima_vm *vm, struct lima_bo *bo, bool create)
{
struct lima_bo_va *bo_va;
struct sg_dma_page_iter sg_iter;
int offset = 0, err;
mutex_lock(&bo->lock);
bo_va = lima_vm_bo_find(vm, bo);
if (bo_va) {
bo_va->ref_count++;
mutex_unlock(&bo->lock);
return 0;
}
/* should not create new bo_va if not asked by caller */
if (!create) {
mutex_unlock(&bo->lock);
return -ENOENT;
}
bo_va = kzalloc(sizeof(*bo_va), GFP_KERNEL);
if (!bo_va) {
err = -ENOMEM;
goto err_out0;
}
bo_va->vm = vm;
bo_va->ref_count = 1;
mutex_lock(&vm->lock);
err = drm_mm_insert_node(&vm->mm, &bo_va->node, lima_bo_size(bo));
if (err)
goto err_out1;
for_each_sgtable_dma_page(bo->base.sgt, &sg_iter, 0) {
err = lima_vm_map_page(vm, sg_page_iter_dma_address(&sg_iter),
bo_va->node.start + offset);
if (err)
goto err_out2;
offset += PAGE_SIZE;
}
mutex_unlock(&vm->lock);
list_add_tail(&bo_va->list, &bo->va);
mutex_unlock(&bo->lock);
return 0;
err_out2:
if (offset)
lima_vm_unmap_range(vm, bo_va->node.start, bo_va->node.start + offset - 1);
drm_mm_remove_node(&bo_va->node);
err_out1:
mutex_unlock(&vm->lock);
kfree(bo_va);
err_out0:
mutex_unlock(&bo->lock);
return err;
}
void lima_vm_bo_del(struct lima_vm *vm, struct lima_bo *bo)
{
struct lima_bo_va *bo_va;
u32 size;
mutex_lock(&bo->lock);
bo_va = lima_vm_bo_find(vm, bo);
if (--bo_va->ref_count > 0) {
mutex_unlock(&bo->lock);
return;
}
mutex_lock(&vm->lock);
size = bo->heap_size ? bo->heap_size : bo_va->node.size;
lima_vm_unmap_range(vm, bo_va->node.start,
bo_va->node.start + size - 1);
drm_mm_remove_node(&bo_va->node);
mutex_unlock(&vm->lock);
list_del(&bo_va->list);
mutex_unlock(&bo->lock);
kfree(bo_va);
}
u32 lima_vm_get_va(struct lima_vm *vm, struct lima_bo *bo)
{
struct lima_bo_va *bo_va;
u32 ret;
mutex_lock(&bo->lock);
bo_va = lima_vm_bo_find(vm, bo);
ret = bo_va->node.start;
mutex_unlock(&bo->lock);
return ret;
}
struct lima_vm *lima_vm_create(struct lima_device *dev)
{
struct lima_vm *vm;
vm = kzalloc(sizeof(*vm), GFP_KERNEL);
if (!vm)
return NULL;
vm->dev = dev;
mutex_init(&vm->lock);
kref_init(&vm->refcount);
vm->pd.cpu = dma_alloc_wc(dev->dev, LIMA_PAGE_SIZE, &vm->pd.dma,
GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO);
if (!vm->pd.cpu)
goto err_out0;
if (dev->dlbu_cpu) {
int err = lima_vm_map_page(
vm, dev->dlbu_dma, LIMA_VA_RESERVE_DLBU);
if (err)
goto err_out1;
}
drm_mm_init(&vm->mm, dev->va_start, dev->va_end - dev->va_start);
return vm;
err_out1:
dma_free_wc(dev->dev, LIMA_PAGE_SIZE, vm->pd.cpu, vm->pd.dma);
err_out0:
kfree(vm);
return NULL;
}
void lima_vm_release(struct kref *kref)
{
struct lima_vm *vm = container_of(kref, struct lima_vm, refcount);
int i;
drm_mm_takedown(&vm->mm);
for (i = 0; i < LIMA_VM_NUM_BT; i++) {
if (vm->bts[i].cpu)
dma_free_wc(vm->dev->dev, LIMA_PAGE_SIZE << LIMA_VM_NUM_PT_PER_BT_SHIFT,
vm->bts[i].cpu, vm->bts[i].dma);
}
if (vm->pd.cpu)
dma_free_wc(vm->dev->dev, LIMA_PAGE_SIZE, vm->pd.cpu, vm->pd.dma);
kfree(vm);
}
void lima_vm_print(struct lima_vm *vm)
{
int i, j, k;
u32 *pd, *pt;
if (!vm->pd.cpu)
return;
pd = vm->pd.cpu;
for (i = 0; i < LIMA_VM_NUM_BT; i++) {
if (!vm->bts[i].cpu)
continue;
pt = vm->bts[i].cpu;
for (j = 0; j < LIMA_VM_NUM_PT_PER_BT; j++) {
int idx = (i << LIMA_VM_NUM_PT_PER_BT_SHIFT) + j;
printk(KERN_INFO "lima vm pd %03x:%08x\n", idx, pd[idx]);
for (k = 0; k < LIMA_PAGE_ENT_NUM; k++) {
u32 pte = *pt++;
if (pte)
printk(KERN_INFO " pt %03x:%08x\n", k, pte);
}
}
}
}
int lima_vm_map_bo(struct lima_vm *vm, struct lima_bo *bo, int pageoff)
{
struct lima_bo_va *bo_va;
struct sg_dma_page_iter sg_iter;
int offset = 0, err;
u32 base;
mutex_lock(&bo->lock);
bo_va = lima_vm_bo_find(vm, bo);
if (!bo_va) {
err = -ENOENT;
goto err_out0;
}
mutex_lock(&vm->lock);
base = bo_va->node.start + (pageoff << PAGE_SHIFT);
for_each_sgtable_dma_page(bo->base.sgt, &sg_iter, pageoff) {
err = lima_vm_map_page(vm, sg_page_iter_dma_address(&sg_iter),
base + offset);
if (err)
goto err_out1;
offset += PAGE_SIZE;
}
mutex_unlock(&vm->lock);
mutex_unlock(&bo->lock);
return 0;
err_out1:
if (offset)
lima_vm_unmap_range(vm, base, base + offset - 1);
mutex_unlock(&vm->lock);
err_out0:
mutex_unlock(&bo->lock);
return err;
}
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