/*
* Copyright 2012 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.
*
* Authors: Ben Skeggs
*/
#define nv50_instmem(p) container_of((p), struct nv50_instmem, base)
#include "priv.h"
#include <core/memory.h>
#include <subdev/bar.h>
#include <subdev/fb.h>
#include <subdev/gsp.h>
#include <subdev/mmu.h>
struct nv50_instmem {
struct nvkm_instmem base;
u64 addr;
/* Mappings that can be evicted when BAR2 space has been exhausted. */
struct list_head lru;
};
/******************************************************************************
* instmem object implementation
*****************************************************************************/
#define nv50_instobj(p) container_of((p), struct nv50_instobj, base.memory)
struct nv50_instobj {
struct nvkm_instobj base;
struct nv50_instmem *imem;
struct nvkm_memory *ram;
struct nvkm_vma *bar;
refcount_t maps;
void *map;
struct list_head lru;
};
static void
nv50_instobj_wr32_slow(struct nvkm_memory *memory, u64 offset, u32 data)
{
struct nv50_instobj *iobj = nv50_instobj(memory);
struct nv50_instmem *imem = iobj->imem;
struct nvkm_device *device = imem->base.subdev.device;
u64 base = (nvkm_memory_addr(iobj->ram) + offset) & 0xffffff00000ULL;
u64 addr = (nvkm_memory_addr(iobj->ram) + offset) & 0x000000fffffULL;
unsigned long flags;
spin_lock_irqsave(&imem->base.lock, flags);
if (unlikely(imem->addr != base)) {
nvkm_wr32(device, 0x001700, base >> 16);
imem->addr = base;
}
nvkm_wr32(device, 0x700000 + addr, data);
spin_unlock_irqrestore(&imem->base.lock, flags);
}
static u32
nv50_instobj_rd32_slow(struct nvkm_memory *memory, u64 offset)
{
struct nv50_instobj *iobj = nv50_instobj(memory);
struct nv50_instmem *imem = iobj->imem;
struct nvkm_device *device = imem->base.subdev.device;
u64 base = (nvkm_memory_addr(iobj->ram) + offset) & 0xffffff00000ULL;
u64 addr = (nvkm_memory_addr(iobj->ram) + offset) & 0x000000fffffULL;
u32 data;
unsigned long flags;
spin_lock_irqsave(&imem->base.lock, flags);
if (unlikely(imem->addr != base)) {
nvkm_wr32(device, 0x001700, base >> 16);
imem->addr = base;
}
data = nvkm_rd32(device, 0x700000 + addr);
spin_unlock_irqrestore(&imem->base.lock, flags);
return data;
}
static const struct nvkm_memory_ptrs
nv50_instobj_slow = {
.rd32 = nv50_instobj_rd32_slow,
.wr32 = nv50_instobj_wr32_slow,
};
static void
nv50_instobj_wr32(struct nvkm_memory *memory, u64 offset, u32 data)
{
iowrite32_native(data, nv50_instobj(memory)->map + offset);
}
static u32
nv50_instobj_rd32(struct nvkm_memory *memory, u64 offset)
{
return ioread32_native(nv50_instobj(memory)->map + offset);
}
static const struct nvkm_memory_ptrs
nv50_instobj_fast = {
.rd32 = nv50_instobj_rd32,
.wr32 = nv50_instobj_wr32,
};
static void
nv50_instobj_kmap(struct nv50_instobj *iobj, struct nvkm_vmm *vmm)
{
struct nv50_instmem *imem = iobj->imem;
struct nv50_instobj *eobj;
struct nvkm_memory *memory = &iobj->base.memory;
struct nvkm_subdev *subdev = &imem->base.subdev;
struct nvkm_device *device = subdev->device;
struct nvkm_vma *bar = NULL, *ebar;
u64 size = nvkm_memory_size(memory);
void *emap;
int ret;
/* Attempt to allocate BAR2 address-space and map the object
* into it. The lock has to be dropped while doing this due
* to the possibility of recursion for page table allocation.
*/
mutex_unlock(&imem->base.mutex);
while ((ret = nvkm_vmm_get(vmm, 12, size, &bar))) {
/* Evict unused mappings, and keep retrying until we either
* succeed,or there's no more objects left on the LRU.
*/
mutex_lock(&imem->base.mutex);
eobj = list_first_entry_or_null(&imem->lru, typeof(*eobj), lru);
if (eobj) {
nvkm_debug(subdev, "evict %016llx %016llx @ %016llx\n",
nvkm_memory_addr(&eobj->base.memory),
nvkm_memory_size(&eobj->base.memory),
eobj->bar->addr);
list_del_init(&eobj->lru);
ebar = eobj->bar;
eobj->bar = NULL;
emap = eobj->map;
eobj->map = NULL;
}
mutex_unlock(&imem->base.mutex);
if (!eobj)
break;
iounmap(emap);
nvkm_vmm_put(vmm, &ebar);
}
if (ret == 0)
ret = nvkm_memory_map(memory, 0, vmm, bar, NULL, 0);
mutex_lock(&imem->base.mutex);
if (ret || iobj->bar) {
/* We either failed, or another thread beat us. */
mutex_unlock(&imem->base.mutex);
nvkm_vmm_put(vmm, &bar);
mutex_lock(&imem->base.mutex);
return;
}
/* Make the mapping visible to the host. */
iobj->bar = bar;
iobj->map = ioremap_wc(device->func->resource_addr(device, 3) +
(u32)iobj->bar->addr, size);
if (!iobj->map) {
nvkm_warn(subdev, "PRAMIN ioremap failed\n");
nvkm_vmm_put(vmm, &iobj->bar);
}
}
static int
nv50_instobj_map(struct nvkm_memory *memory, u64 offset, struct nvkm_vmm *vmm,
struct nvkm_vma *vma, void *argv, u32 argc)
{
memory = nv50_instobj(memory)->ram;
return nvkm_memory_map(memory, offset, vmm, vma, argv, argc);
}
static void
nv50_instobj_release(struct nvkm_memory *memory)
{
struct nv50_instobj *iobj = nv50_instobj(memory);
struct nv50_instmem *imem = iobj->imem;
struct nvkm_subdev *subdev = &imem->base.subdev;
wmb();
nvkm_bar_flush(subdev->device->bar);
if (refcount_dec_and_mutex_lock(&iobj->maps, &imem->base.mutex)) {
/* Add the now-unused mapping to the LRU instead of directly
* unmapping it here, in case we need to map it again later.
*/
if (likely(iobj->lru.next) && iobj->map) {
BUG_ON(!list_empty(&iobj->lru));
list_add_tail(&iobj->lru, &imem->lru);
}
/* Switch back to NULL accessors when last map is gone. */
iobj->base.memory.ptrs = NULL;
mutex_unlock(&imem->base.mutex);
}
}
static void __iomem *
nv50_instobj_acquire(struct nvkm_memory *memory)
{
struct nv50_instobj *iobj = nv50_instobj(memory);
struct nvkm_instmem *imem = &iobj->imem->base;
struct nvkm_vmm *vmm;
void __iomem *map = NULL;
/* Already mapped? */
if (refcount_inc_not_zero(&iobj->maps)) {
/* read barrier match the wmb on refcount set */
smp_rmb();
return iobj->map;
}
/* Take the lock, and re-check that another thread hasn't
* already mapped the object in the meantime.
*/
mutex_lock(&imem->mutex);
if (refcount_inc_not_zero(&iobj->maps)) {
mutex_unlock(&imem->mutex);
return iobj->map;
}
/* Attempt to get a direct CPU mapping of the object. */
if ((vmm = nvkm_bar_bar2_vmm(imem->subdev.device))) {
if (!iobj->map)
nv50_instobj_kmap(iobj, vmm);
map = iobj->map;
}
if (!refcount_inc_not_zero(&iobj->maps)) {
/* Exclude object from eviction while it's being accessed. */
if (likely(iobj->lru.next))
list_del_init(&iobj->lru);
if (map)
iobj->base.memory.ptrs = &nv50_instobj_fast;
else
iobj->base.memory.ptrs = &nv50_instobj_slow;
/* barrier to ensure the ptrs are written before refcount is set */
smp_wmb();
refcount_set(&iobj->maps, 1);
}
mutex_unlock(&imem->mutex);
return map;
}
static void
nv50_instobj_boot(struct nvkm_memory *memory, struct nvkm_vmm *vmm)
{
struct nv50_instobj *iobj = nv50_instobj(memory);
struct nvkm_instmem *imem = &iobj->imem->base;
/* Exclude bootstrapped objects (ie. the page tables for the
* instmem BAR itself) from eviction.
*/
mutex_lock(&imem->mutex);
if (likely(iobj->lru.next)) {
list_del_init(&iobj->lru);
iobj->lru.next = NULL;
}
nv50_instobj_kmap(iobj, vmm);
nvkm_instmem_boot(imem);
mutex_unlock(&imem->mutex);
}
static u64
nv50_instobj_size(struct nvkm_memory *memory)
{
return nvkm_memory_size(nv50_instobj(memory)->ram);
}
static u64
nv50_instobj_addr(struct nvkm_memory *memory)
{
return nvkm_memory_addr(nv50_instobj(memory)->ram);
}
static u64
nv50_instobj_bar2(struct nvkm_memory *memory)
{
struct nv50_instobj *iobj = nv50_instobj(memory);
u64 addr = ~0ULL;
if (nv50_instobj_acquire(&iobj->base.memory)) {
iobj->lru.next = NULL; /* Exclude from eviction. */
addr = iobj->bar->addr;
}
nv50_instobj_release(&iobj->base.memory);
return addr;
}
static enum nvkm_memory_target
nv50_instobj_target(struct nvkm_memory *memory)
{
return nvkm_memory_target(nv50_instobj(memory)->ram);
}
static void *
nv50_instobj_dtor(struct nvkm_memory *memory)
{
struct nv50_instobj *iobj = nv50_instobj(memory);
struct nvkm_instmem *imem = &iobj->imem->base;
struct nvkm_vma *bar;
void *map;
mutex_lock(&imem->mutex);
if (likely(iobj->lru.next))
list_del(&iobj->lru);
map = iobj->map;
bar = iobj->bar;
mutex_unlock(&imem->mutex);
if (map) {
struct nvkm_vmm *vmm = nvkm_bar_bar2_vmm(imem->subdev.device);
iounmap(map);
if (likely(vmm)) /* Can be NULL during BAR destructor. */
nvkm_vmm_put(vmm, &bar);
}
nvkm_memory_unref(&iobj->ram);
nvkm_instobj_dtor(imem, &iobj->base);
return iobj;
}
static const struct nvkm_memory_func
nv50_instobj_func = {
.dtor = nv50_instobj_dtor,
.target = nv50_instobj_target,
.bar2 = nv50_instobj_bar2,
.addr = nv50_instobj_addr,
.size = nv50_instobj_size,
.boot = nv50_instobj_boot,
.acquire = nv50_instobj_acquire,
.release = nv50_instobj_release,
.map = nv50_instobj_map,
};
static int
nv50_instobj_wrap(struct nvkm_instmem *base,
struct nvkm_memory *memory, struct nvkm_memory **pmemory)
{
struct nv50_instmem *imem = nv50_instmem(base);
struct nv50_instobj *iobj;
if (!(iobj = kzalloc(sizeof(*iobj), GFP_KERNEL)))
return -ENOMEM;
*pmemory = &iobj->base.memory;
nvkm_instobj_ctor(&nv50_instobj_func, &imem->base, &iobj->base);
iobj->imem = imem;
refcount_set(&iobj->maps, 0);
INIT_LIST_HEAD(&iobj->lru);
iobj->ram = nvkm_memory_ref(memory);
return 0;
}
static int
nv50_instobj_new(struct nvkm_instmem *imem, u32 size, u32 align, bool zero,
struct nvkm_memory **pmemory)
{
u8 page = max(order_base_2(align), 12);
struct nvkm_memory *ram;
int ret;
ret = nvkm_ram_get(imem->subdev.device, 0, 1, page, size, true, true, &ram);
if (ret)
return ret;
ret = nv50_instobj_wrap(imem, ram, pmemory);
nvkm_memory_unref(&ram);
return ret;
}
/******************************************************************************
* instmem subdev implementation
*****************************************************************************/
static void
nv50_instmem_fini(struct nvkm_instmem *base)
{
nv50_instmem(base)->addr = ~0ULL;
}
static void *
nv50_instmem_dtor(struct nvkm_instmem *base)
{
return nv50_instmem(base);
}
static const struct nvkm_instmem_func
nv50_instmem = {
.dtor = nv50_instmem_dtor,
.fini = nv50_instmem_fini,
.suspend = nv04_instmem_suspend,
.resume = nv04_instmem_resume,
.memory_new = nv50_instobj_new,
.memory_wrap = nv50_instobj_wrap,
.zero = false,
};
int
nv50_instmem_new_(const struct nvkm_instmem_func *func,
struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
struct nvkm_instmem **pimem)
{
struct nv50_instmem *imem;
if (!(imem = kzalloc(sizeof(*imem), GFP_KERNEL)))
return -ENOMEM;
nvkm_instmem_ctor(func, device, type, inst, &imem->base);
INIT_LIST_HEAD(&imem->lru);
*pimem = &imem->base;
return 0;
}
int
nv50_instmem_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
struct nvkm_instmem **pimem)
{
if (nvkm_gsp_rm(device->gsp))
return r535_instmem_new(&nv50_instmem, device, type, inst, pimem);
return nv50_instmem_new_(&nv50_instmem, device, type, inst, pimem);
}
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