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linux/drivers/gpu/drm/nouveau/nouveau_sgdma.c
Ben Skeggs a0d9a8feb9 drm/nouveau: remove allocations from gart populate() hook 
Since some somewhat questionable changes a while back, TTM provides a
completely empty array of struct dma_address that stays around for the
entire lifetime of the TTM object.

Lets use this array, *always*, rather than wasting yet more memory on
another array who's purpose is identical, as well as yet another bool array
of the same size saying *which* of the previous two arrays to use...

This change will also solve the high order allocation failures seen by
some people while using nouveau.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
2011-09-20 16:12:27 +10:00

514 lines
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#include "drmP.h"
#include "nouveau_drv.h"
#include <linux/pagemap.h>
#include <linux/slab.h>
#define NV_CTXDMA_PAGE_SHIFT 12
#define NV_CTXDMA_PAGE_SIZE (1 << NV_CTXDMA_PAGE_SHIFT)
#define NV_CTXDMA_PAGE_MASK (NV_CTXDMA_PAGE_SIZE - 1)
struct nouveau_sgdma_be {
struct ttm_backend backend;
struct drm_device *dev;
dma_addr_t *pages;
unsigned nr_pages;
bool unmap_pages;
u64 offset;
bool bound;
};
static int
nouveau_sgdma_populate(struct ttm_backend *be, unsigned long num_pages,
struct page **pages, struct page *dummy_read_page,
dma_addr_t *dma_addrs)
{
struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
struct drm_device *dev = nvbe->dev;
int i;
NV_DEBUG(nvbe->dev, "num_pages = %ld\n", num_pages);
nvbe->pages = dma_addrs;
nvbe->nr_pages = num_pages;
nvbe->unmap_pages = true;
/* this code path isn't called and is incorrect anyways */
if (0) { /* dma_addrs[0] != DMA_ERROR_CODE) { */
nvbe->unmap_pages = false;
return 0;
}
for (i = 0; i < num_pages; i++) {
nvbe->pages[i] = pci_map_page(dev->pdev, pages[i], 0,
PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
if (pci_dma_mapping_error(dev->pdev, nvbe->pages[i])) {
nvbe->nr_pages = --i;
be->func->clear(be);
return -EFAULT;
}
}
return 0;
}
static void
nouveau_sgdma_clear(struct ttm_backend *be)
{
struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
struct drm_device *dev = nvbe->dev;
if (nvbe->bound)
be->func->unbind(be);
if (nvbe->unmap_pages) {
while (nvbe->nr_pages--) {
pci_unmap_page(dev->pdev, nvbe->pages[nvbe->nr_pages],
PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
}
}
}
static void
nouveau_sgdma_destroy(struct ttm_backend *be)
{
struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
if (be) {
NV_DEBUG(nvbe->dev, "\n");
if (nvbe) {
if (nvbe->pages)
be->func->clear(be);
kfree(nvbe);
}
}
}
static int
nv04_sgdma_bind(struct ttm_backend *be, struct ttm_mem_reg *mem)
{
struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
struct drm_device *dev = nvbe->dev;
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_gpuobj *gpuobj = dev_priv->gart_info.sg_ctxdma;
unsigned i, j, pte;
NV_DEBUG(dev, "pg=0x%lx\n", mem->start);
nvbe->offset = mem->start << PAGE_SHIFT;
pte = (nvbe->offset >> NV_CTXDMA_PAGE_SHIFT) + 2;
for (i = 0; i < nvbe->nr_pages; i++) {
dma_addr_t dma_offset = nvbe->pages[i];
uint32_t offset_l = lower_32_bits(dma_offset);
for (j = 0; j < PAGE_SIZE / NV_CTXDMA_PAGE_SIZE; j++, pte++) {
nv_wo32(gpuobj, (pte * 4) + 0, offset_l | 3);
offset_l += NV_CTXDMA_PAGE_SIZE;
}
}
nvbe->bound = true;
return 0;
}
static int
nv04_sgdma_unbind(struct ttm_backend *be)
{
struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
struct drm_device *dev = nvbe->dev;
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_gpuobj *gpuobj = dev_priv->gart_info.sg_ctxdma;
unsigned i, j, pte;
NV_DEBUG(dev, "\n");
if (!nvbe->bound)
return 0;
pte = (nvbe->offset >> NV_CTXDMA_PAGE_SHIFT) + 2;
for (i = 0; i < nvbe->nr_pages; i++) {
for (j = 0; j < PAGE_SIZE / NV_CTXDMA_PAGE_SIZE; j++, pte++)
nv_wo32(gpuobj, (pte * 4) + 0, 0x00000000);
}
nvbe->bound = false;
return 0;
}
static struct ttm_backend_func nv04_sgdma_backend = {
.populate = nouveau_sgdma_populate,
.clear = nouveau_sgdma_clear,
.bind = nv04_sgdma_bind,
.unbind = nv04_sgdma_unbind,
.destroy = nouveau_sgdma_destroy
};
static void
nv41_sgdma_flush(struct nouveau_sgdma_be *nvbe)
{
struct drm_device *dev = nvbe->dev;
nv_wr32(dev, 0x100810, 0x00000022);
if (!nv_wait(dev, 0x100810, 0x00000100, 0x00000100))
NV_ERROR(dev, "vm flush timeout: 0x%08x\n",
nv_rd32(dev, 0x100810));
nv_wr32(dev, 0x100810, 0x00000000);
}
static int
nv41_sgdma_bind(struct ttm_backend *be, struct ttm_mem_reg *mem)
{
struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
struct nouveau_gpuobj *pgt = dev_priv->gart_info.sg_ctxdma;
dma_addr_t *list = nvbe->pages;
u32 pte = mem->start << 2;
u32 cnt = nvbe->nr_pages;
nvbe->offset = mem->start << PAGE_SHIFT;
while (cnt--) {
nv_wo32(pgt, pte, (*list++ >> 7) | 1);
pte += 4;
}
nv41_sgdma_flush(nvbe);
nvbe->bound = true;
return 0;
}
static int
nv41_sgdma_unbind(struct ttm_backend *be)
{
struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
struct nouveau_gpuobj *pgt = dev_priv->gart_info.sg_ctxdma;
u32 pte = (nvbe->offset >> 12) << 2;
u32 cnt = nvbe->nr_pages;
while (cnt--) {
nv_wo32(pgt, pte, 0x00000000);
pte += 4;
}
nv41_sgdma_flush(nvbe);
nvbe->bound = false;
return 0;
}
static struct ttm_backend_func nv41_sgdma_backend = {
.populate = nouveau_sgdma_populate,
.clear = nouveau_sgdma_clear,
.bind = nv41_sgdma_bind,
.unbind = nv41_sgdma_unbind,
.destroy = nouveau_sgdma_destroy
};
static void
nv44_sgdma_flush(struct nouveau_sgdma_be *nvbe)
{
struct drm_device *dev = nvbe->dev;
nv_wr32(dev, 0x100814, (nvbe->nr_pages - 1) << 12);
nv_wr32(dev, 0x100808, nvbe->offset | 0x20);
if (!nv_wait(dev, 0x100808, 0x00000001, 0x00000001))
NV_ERROR(dev, "gart flush timeout: 0x%08x\n",
nv_rd32(dev, 0x100808));
nv_wr32(dev, 0x100808, 0x00000000);
}
static void
nv44_sgdma_fill(struct nouveau_gpuobj *pgt, dma_addr_t *list, u32 base, u32 cnt)
{
struct drm_nouveau_private *dev_priv = pgt->dev->dev_private;
dma_addr_t dummy = dev_priv->gart_info.dummy.addr;
u32 pte, tmp[4];
pte = base >> 2;
base &= ~0x0000000f;
tmp[0] = nv_ro32(pgt, base + 0x0);
tmp[1] = nv_ro32(pgt, base + 0x4);
tmp[2] = nv_ro32(pgt, base + 0x8);
tmp[3] = nv_ro32(pgt, base + 0xc);
while (cnt--) {
u32 addr = list ? (*list++ >> 12) : (dummy >> 12);
switch (pte++ & 0x3) {
case 0:
tmp[0] &= ~0x07ffffff;
tmp[0] |= addr;
break;
case 1:
tmp[0] &= ~0xf8000000;
tmp[0] |= addr << 27;
tmp[1] &= ~0x003fffff;
tmp[1] |= addr >> 5;
break;
case 2:
tmp[1] &= ~0xffc00000;
tmp[1] |= addr << 22;
tmp[2] &= ~0x0001ffff;
tmp[2] |= addr >> 10;
break;
case 3:
tmp[2] &= ~0xfffe0000;
tmp[2] |= addr << 17;
tmp[3] &= ~0x00000fff;
tmp[3] |= addr >> 15;
break;
}
}
tmp[3] |= 0x40000000;
nv_wo32(pgt, base + 0x0, tmp[0]);
nv_wo32(pgt, base + 0x4, tmp[1]);
nv_wo32(pgt, base + 0x8, tmp[2]);
nv_wo32(pgt, base + 0xc, tmp[3]);
}
static int
nv44_sgdma_bind(struct ttm_backend *be, struct ttm_mem_reg *mem)
{
struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
struct nouveau_gpuobj *pgt = dev_priv->gart_info.sg_ctxdma;
dma_addr_t *list = nvbe->pages;
u32 pte = mem->start << 2, tmp[4];
u32 cnt = nvbe->nr_pages;
int i;
nvbe->offset = mem->start << PAGE_SHIFT;
if (pte & 0x0000000c) {
u32 max = 4 - ((pte >> 2) & 0x3);
u32 part = (cnt > max) ? max : cnt;
nv44_sgdma_fill(pgt, list, pte, part);
pte += (part << 2);
list += part;
cnt -= part;
}
while (cnt >= 4) {
for (i = 0; i < 4; i++)
tmp[i] = *list++ >> 12;
nv_wo32(pgt, pte + 0x0, tmp[0] >> 0 | tmp[1] << 27);
nv_wo32(pgt, pte + 0x4, tmp[1] >> 5 | tmp[2] << 22);
nv_wo32(pgt, pte + 0x8, tmp[2] >> 10 | tmp[3] << 17);
nv_wo32(pgt, pte + 0xc, tmp[3] >> 15 | 0x40000000);
pte += 0x10;
cnt -= 4;
}
if (cnt)
nv44_sgdma_fill(pgt, list, pte, cnt);
nv44_sgdma_flush(nvbe);
nvbe->bound = true;
return 0;
}
static int
nv44_sgdma_unbind(struct ttm_backend *be)
{
struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
struct nouveau_gpuobj *pgt = dev_priv->gart_info.sg_ctxdma;
u32 pte = (nvbe->offset >> 12) << 2;
u32 cnt = nvbe->nr_pages;
if (pte & 0x0000000c) {
u32 max = 4 - ((pte >> 2) & 0x3);
u32 part = (cnt > max) ? max : cnt;
nv44_sgdma_fill(pgt, NULL, pte, part);
pte += (part << 2);
cnt -= part;
}
while (cnt >= 4) {
nv_wo32(pgt, pte + 0x0, 0x00000000);
nv_wo32(pgt, pte + 0x4, 0x00000000);
nv_wo32(pgt, pte + 0x8, 0x00000000);
nv_wo32(pgt, pte + 0xc, 0x00000000);
pte += 0x10;
cnt -= 4;
}
if (cnt)
nv44_sgdma_fill(pgt, NULL, pte, cnt);
nv44_sgdma_flush(nvbe);
nvbe->bound = false;
return 0;
}
static struct ttm_backend_func nv44_sgdma_backend = {
.populate = nouveau_sgdma_populate,
.clear = nouveau_sgdma_clear,
.bind = nv44_sgdma_bind,
.unbind = nv44_sgdma_unbind,
.destroy = nouveau_sgdma_destroy
};
static int
nv50_sgdma_bind(struct ttm_backend *be, struct ttm_mem_reg *mem)
{
struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
struct nouveau_mem *node = mem->mm_node;
/* noop: bound in move_notify() */
node->pages = nvbe->pages;
nvbe->pages = (dma_addr_t *)node;
nvbe->bound = true;
return 0;
}
static int
nv50_sgdma_unbind(struct ttm_backend *be)
{
struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
struct nouveau_mem *node = (struct nouveau_mem *)nvbe->pages;
/* noop: unbound in move_notify() */
nvbe->pages = node->pages;
node->pages = NULL;
nvbe->bound = false;
return 0;
}
static struct ttm_backend_func nv50_sgdma_backend = {
.populate = nouveau_sgdma_populate,
.clear = nouveau_sgdma_clear,
.bind = nv50_sgdma_bind,
.unbind = nv50_sgdma_unbind,
.destroy = nouveau_sgdma_destroy
};
struct ttm_backend *
nouveau_sgdma_init_ttm(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_sgdma_be *nvbe;
nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
if (!nvbe)
return NULL;
nvbe->dev = dev;
nvbe->backend.func = dev_priv->gart_info.func;
return &nvbe->backend;
}
int
nouveau_sgdma_init(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_gpuobj *gpuobj = NULL;
u32 aper_size, align;
int ret;
if (dev_priv->card_type >= NV_40 && pci_is_pcie(dev->pdev))
aper_size = 512 * 1024 * 1024;
else
aper_size = 64 * 1024 * 1024;
/* Dear NVIDIA, NV44+ would like proper present bits in PTEs for
* christmas. The cards before it have them, the cards after
* it have them, why is NV44 so unloved?
*/
dev_priv->gart_info.dummy.page = alloc_page(GFP_DMA32 | GFP_KERNEL);
if (!dev_priv->gart_info.dummy.page)
return -ENOMEM;
dev_priv->gart_info.dummy.addr =
pci_map_page(dev->pdev, dev_priv->gart_info.dummy.page,
0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
if (pci_dma_mapping_error(dev->pdev, dev_priv->gart_info.dummy.addr)) {
NV_ERROR(dev, "error mapping dummy page\n");
__free_page(dev_priv->gart_info.dummy.page);
dev_priv->gart_info.dummy.page = NULL;
return -ENOMEM;
}
if (dev_priv->card_type >= NV_50) {
dev_priv->gart_info.aper_base = 0;
dev_priv->gart_info.aper_size = aper_size;
dev_priv->gart_info.type = NOUVEAU_GART_HW;
dev_priv->gart_info.func = &nv50_sgdma_backend;
} else
if (0 && pci_is_pcie(dev->pdev) &&
dev_priv->chipset > 0x40 && dev_priv->chipset != 0x45) {
if (nv44_graph_class(dev)) {
dev_priv->gart_info.func = &nv44_sgdma_backend;
align = 512 * 1024;
} else {
dev_priv->gart_info.func = &nv41_sgdma_backend;
align = 16;
}
ret = nouveau_gpuobj_new(dev, NULL, aper_size / 1024, align,
NVOBJ_FLAG_ZERO_ALLOC |
NVOBJ_FLAG_ZERO_FREE, &gpuobj);
if (ret) {
NV_ERROR(dev, "Error creating sgdma object: %d\n", ret);
return ret;
}
dev_priv->gart_info.sg_ctxdma = gpuobj;
dev_priv->gart_info.aper_base = 0;
dev_priv->gart_info.aper_size = aper_size;
dev_priv->gart_info.type = NOUVEAU_GART_HW;
} else {
ret = nouveau_gpuobj_new(dev, NULL, (aper_size / 1024) + 8, 16,
NVOBJ_FLAG_ZERO_ALLOC |
NVOBJ_FLAG_ZERO_FREE, &gpuobj);
if (ret) {
NV_ERROR(dev, "Error creating sgdma object: %d\n", ret);
return ret;
}
nv_wo32(gpuobj, 0, NV_CLASS_DMA_IN_MEMORY |
(1 << 12) /* PT present */ |
(0 << 13) /* PT *not* linear */ |
(0 << 14) /* RW */ |
(2 << 16) /* PCI */);
nv_wo32(gpuobj, 4, aper_size - 1);
dev_priv->gart_info.sg_ctxdma = gpuobj;
dev_priv->gart_info.aper_base = 0;
dev_priv->gart_info.aper_size = aper_size;
dev_priv->gart_info.type = NOUVEAU_GART_PDMA;
dev_priv->gart_info.func = &nv04_sgdma_backend;
}
return 0;
}
void
nouveau_sgdma_takedown(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
nouveau_gpuobj_ref(NULL, &dev_priv->gart_info.sg_ctxdma);
if (dev_priv->gart_info.dummy.page) {
pci_unmap_page(dev->pdev, dev_priv->gart_info.dummy.addr,
PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
__free_page(dev_priv->gart_info.dummy.page);
dev_priv->gart_info.dummy.page = NULL;
}
}
uint32_t
nouveau_sgdma_get_physical(struct drm_device *dev, uint32_t offset)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_gpuobj *gpuobj = dev_priv->gart_info.sg_ctxdma;
int pte = (offset >> NV_CTXDMA_PAGE_SHIFT) + 2;
BUG_ON(dev_priv->card_type >= NV_50);
return (nv_ro32(gpuobj, 4 * pte) & ~NV_CTXDMA_PAGE_MASK) |
(offset & NV_CTXDMA_PAGE_MASK);
}
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