// SPDX-License-Identifier: GPL-2.0 OR MIT
/**************************************************************************
*
* Copyright 2012-2023 VMware, Inc., Palo Alto, CA., USA
*
* 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, sub license, 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 (including the
* next paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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 "vmwgfx_bo.h"
#include "vmwgfx_drv.h"
#include <linux/highmem.h>
#ifdef CONFIG_64BIT
#define VMW_PPN_SIZE 8
#define VMW_MOBFMT_PTDEPTH_0 SVGA3D_MOBFMT_PT64_0
#define VMW_MOBFMT_PTDEPTH_1 SVGA3D_MOBFMT_PT64_1
#define VMW_MOBFMT_PTDEPTH_2 SVGA3D_MOBFMT_PT64_2
#else
#define VMW_PPN_SIZE 4
#define VMW_MOBFMT_PTDEPTH_0 SVGA3D_MOBFMT_PT_0
#define VMW_MOBFMT_PTDEPTH_1 SVGA3D_MOBFMT_PT_1
#define VMW_MOBFMT_PTDEPTH_2 SVGA3D_MOBFMT_PT_2
#endif
/*
* struct vmw_mob - Structure containing page table and metadata for a
* Guest Memory OBject.
*
* @num_pages Number of pages that make up the page table.
* @pt_level The indirection level of the page table. 0-2.
* @pt_root_page DMA address of the level 0 page of the page table.
*/
struct vmw_mob {
struct vmw_bo *pt_bo;
unsigned long num_pages;
unsigned pt_level;
dma_addr_t pt_root_page;
uint32_t id;
};
/*
* struct vmw_otable - Guest Memory OBject table metadata
*
* @size: Size of the table (page-aligned).
* @page_table: Pointer to a struct vmw_mob holding the page table.
*/
static const struct vmw_otable pre_dx_tables[] = {
{VMWGFX_NUM_MOB * sizeof(SVGAOTableMobEntry), NULL, true},
{VMWGFX_NUM_GB_SURFACE * sizeof(SVGAOTableSurfaceEntry), NULL, true},
{VMWGFX_NUM_GB_CONTEXT * sizeof(SVGAOTableContextEntry), NULL, true},
{VMWGFX_NUM_GB_SHADER * sizeof(SVGAOTableShaderEntry), NULL, true},
{VMWGFX_NUM_GB_SCREEN_TARGET * sizeof(SVGAOTableScreenTargetEntry),
NULL, true}
};
static const struct vmw_otable dx_tables[] = {
{VMWGFX_NUM_MOB * sizeof(SVGAOTableMobEntry), NULL, true},
{VMWGFX_NUM_GB_SURFACE * sizeof(SVGAOTableSurfaceEntry), NULL, true},
{VMWGFX_NUM_GB_CONTEXT * sizeof(SVGAOTableContextEntry), NULL, true},
{VMWGFX_NUM_GB_SHADER * sizeof(SVGAOTableShaderEntry), NULL, true},
{VMWGFX_NUM_GB_SCREEN_TARGET * sizeof(SVGAOTableScreenTargetEntry),
NULL, true},
{VMWGFX_NUM_DXCONTEXT * sizeof(SVGAOTableDXContextEntry), NULL, true},
};
static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
struct vmw_mob *mob);
static void vmw_mob_pt_setup(struct vmw_mob *mob,
struct vmw_piter data_iter,
unsigned long num_data_pages);
static inline void vmw_bo_unpin_unlocked(struct ttm_buffer_object *bo)
{
int ret = ttm_bo_reserve(bo, false, true, NULL);
BUG_ON(ret != 0);
ttm_bo_unpin(bo);
ttm_bo_unreserve(bo);
}
/*
* vmw_setup_otable_base - Issue an object table base setup command to
* the device
*
* @dev_priv: Pointer to a device private structure
* @type: Type of object table base
* @offset Start of table offset into dev_priv::otable_bo
* @otable Pointer to otable metadata;
*
* This function returns -ENOMEM if it fails to reserve fifo space,
* and may block waiting for fifo space.
*/
static int vmw_setup_otable_base(struct vmw_private *dev_priv,
SVGAOTableType type,
struct ttm_buffer_object *otable_bo,
unsigned long offset,
struct vmw_otable *otable)
{
struct {
SVGA3dCmdHeader header;
SVGA3dCmdSetOTableBase64 body;
} *cmd;
struct vmw_mob *mob;
const struct vmw_sg_table *vsgt;
struct vmw_piter iter;
int ret;
BUG_ON(otable->page_table != NULL);
vsgt = vmw_bo_sg_table(otable_bo);
vmw_piter_start(&iter, vsgt, offset >> PAGE_SHIFT);
WARN_ON(!vmw_piter_next(&iter));
mob = vmw_mob_create(otable->size >> PAGE_SHIFT);
if (unlikely(mob == NULL)) {
DRM_ERROR("Failed creating OTable page table.\n");
return -ENOMEM;
}
if (otable->size <= PAGE_SIZE) {
mob->pt_level = VMW_MOBFMT_PTDEPTH_0;
mob->pt_root_page = vmw_piter_dma_addr(&iter);
} else {
ret = vmw_mob_pt_populate(dev_priv, mob);
if (unlikely(ret != 0))
goto out_no_populate;
vmw_mob_pt_setup(mob, iter, otable->size >> PAGE_SHIFT);
mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PT_1;
}
cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
if (unlikely(cmd == NULL)) {
ret = -ENOMEM;
goto out_no_fifo;
}
memset(cmd, 0, sizeof(*cmd));
cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE64;
cmd->header.size = sizeof(cmd->body);
cmd->body.type = type;
cmd->body.baseAddress = mob->pt_root_page >> PAGE_SHIFT;
cmd->body.sizeInBytes = otable->size;
cmd->body.validSizeInBytes = 0;
cmd->body.ptDepth = mob->pt_level;
/*
* The device doesn't support this, But the otable size is
* determined at compile-time, so this BUG shouldn't trigger
* randomly.
*/
BUG_ON(mob->pt_level == VMW_MOBFMT_PTDEPTH_2);
vmw_cmd_commit(dev_priv, sizeof(*cmd));
otable->page_table = mob;
return 0;
out_no_fifo:
out_no_populate:
vmw_mob_destroy(mob);
return ret;
}
/*
* vmw_takedown_otable_base - Issue an object table base takedown command
* to the device
*
* @dev_priv: Pointer to a device private structure
* @type: Type of object table base
*
*/
static void vmw_takedown_otable_base(struct vmw_private *dev_priv,
SVGAOTableType type,
struct vmw_otable *otable)
{
struct {
SVGA3dCmdHeader header;
SVGA3dCmdSetOTableBase body;
} *cmd;
struct ttm_buffer_object *bo;
if (otable->page_table == NULL)
return;
bo = &otable->page_table->pt_bo->tbo;
cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
if (unlikely(cmd == NULL))
return;
memset(cmd, 0, sizeof(*cmd));
cmd->header.id = SVGA_3D_CMD_SET_OTABLE_BASE;
cmd->header.size = sizeof(cmd->body);
cmd->body.type = type;
cmd->body.baseAddress = 0;
cmd->body.sizeInBytes = 0;
cmd->body.validSizeInBytes = 0;
cmd->body.ptDepth = SVGA3D_MOBFMT_INVALID;
vmw_cmd_commit(dev_priv, sizeof(*cmd));
if (bo) {
int ret;
ret = ttm_bo_reserve(bo, false, true, NULL);
BUG_ON(ret != 0);
vmw_bo_fence_single(bo, NULL);
ttm_bo_unreserve(bo);
}
vmw_mob_destroy(otable->page_table);
otable->page_table = NULL;
}
static int vmw_otable_batch_setup(struct vmw_private *dev_priv,
struct vmw_otable_batch *batch)
{
unsigned long offset;
unsigned long bo_size;
struct vmw_otable *otables = batch->otables;
SVGAOTableType i;
int ret;
bo_size = 0;
for (i = 0; i < batch->num_otables; ++i) {
if (!otables[i].enabled)
continue;
otables[i].size = PFN_ALIGN(otables[i].size);
bo_size += otables[i].size;
}
ret = vmw_bo_create_and_populate(dev_priv, bo_size,
VMW_BO_DOMAIN_WAITABLE_SYS,
&batch->otable_bo);
if (unlikely(ret != 0))
return ret;
offset = 0;
for (i = 0; i < batch->num_otables; ++i) {
if (!batch->otables[i].enabled)
continue;
ret = vmw_setup_otable_base(dev_priv, i,
&batch->otable_bo->tbo,
offset,
&otables[i]);
if (unlikely(ret != 0))
goto out_no_setup;
offset += otables[i].size;
}
return 0;
out_no_setup:
for (i = 0; i < batch->num_otables; ++i) {
if (batch->otables[i].enabled)
vmw_takedown_otable_base(dev_priv, i,
&batch->otables[i]);
}
vmw_bo_unpin_unlocked(&batch->otable_bo->tbo);
ttm_bo_put(&batch->otable_bo->tbo);
batch->otable_bo = NULL;
return ret;
}
/*
* vmw_otables_setup - Set up guest backed memory object tables
*
* @dev_priv: Pointer to a device private structure
*
* Takes care of the device guest backed surface
* initialization, by setting up the guest backed memory object tables.
* Returns 0 on success and various error codes on failure. A successful return
* means the object tables can be taken down using the vmw_otables_takedown
* function.
*/
int vmw_otables_setup(struct vmw_private *dev_priv)
{
struct vmw_otable **otables = &dev_priv->otable_batch.otables;
int ret;
if (has_sm4_context(dev_priv)) {
*otables = kmemdup(dx_tables, sizeof(dx_tables), GFP_KERNEL);
if (!(*otables))
return -ENOMEM;
dev_priv->otable_batch.num_otables = ARRAY_SIZE(dx_tables);
} else {
*otables = kmemdup(pre_dx_tables, sizeof(pre_dx_tables),
GFP_KERNEL);
if (!(*otables))
return -ENOMEM;
dev_priv->otable_batch.num_otables = ARRAY_SIZE(pre_dx_tables);
}
ret = vmw_otable_batch_setup(dev_priv, &dev_priv->otable_batch);
if (unlikely(ret != 0))
goto out_setup;
return 0;
out_setup:
kfree(*otables);
return ret;
}
static void vmw_otable_batch_takedown(struct vmw_private *dev_priv,
struct vmw_otable_batch *batch)
{
SVGAOTableType i;
struct ttm_buffer_object *bo = &batch->otable_bo->tbo;
int ret;
for (i = 0; i < batch->num_otables; ++i)
if (batch->otables[i].enabled)
vmw_takedown_otable_base(dev_priv, i,
&batch->otables[i]);
ret = ttm_bo_reserve(bo, false, true, NULL);
BUG_ON(ret != 0);
vmw_bo_fence_single(bo, NULL);
ttm_bo_unpin(bo);
ttm_bo_unreserve(bo);
vmw_bo_unreference(&batch->otable_bo);
}
/*
* vmw_otables_takedown - Take down guest backed memory object tables
*
* @dev_priv: Pointer to a device private structure
*
* Take down the Guest Memory Object tables.
*/
void vmw_otables_takedown(struct vmw_private *dev_priv)
{
vmw_otable_batch_takedown(dev_priv, &dev_priv->otable_batch);
kfree(dev_priv->otable_batch.otables);
}
/*
* vmw_mob_calculate_pt_pages - Calculate the number of page table pages
* needed for a guest backed memory object.
*
* @data_pages: Number of data pages in the memory object buffer.
*/
static unsigned long vmw_mob_calculate_pt_pages(unsigned long data_pages)
{
unsigned long data_size = data_pages * PAGE_SIZE;
unsigned long tot_size = 0;
while (likely(data_size > PAGE_SIZE)) {
data_size = DIV_ROUND_UP(data_size, PAGE_SIZE);
data_size *= VMW_PPN_SIZE;
tot_size += PFN_ALIGN(data_size);
}
return tot_size >> PAGE_SHIFT;
}
/*
* vmw_mob_create - Create a mob, but don't populate it.
*
* @data_pages: Number of data pages of the underlying buffer object.
*/
struct vmw_mob *vmw_mob_create(unsigned long data_pages)
{
struct vmw_mob *mob = kzalloc(sizeof(*mob), GFP_KERNEL);
if (unlikely(!mob))
return NULL;
mob->num_pages = vmw_mob_calculate_pt_pages(data_pages);
return mob;
}
/*
* vmw_mob_pt_populate - Populate the mob pagetable
*
* @mob: Pointer to the mob the pagetable of which we want to
* populate.
*
* This function allocates memory to be used for the pagetable.
* Returns ENOMEM if memory resources aren't sufficient and may
* cause TTM buffer objects to be swapped out.
*/
static int vmw_mob_pt_populate(struct vmw_private *dev_priv,
struct vmw_mob *mob)
{
BUG_ON(mob->pt_bo != NULL);
return vmw_bo_create_and_populate(dev_priv, mob->num_pages * PAGE_SIZE,
VMW_BO_DOMAIN_WAITABLE_SYS,
&mob->pt_bo);
}
/**
* vmw_mob_assign_ppn - Assign a value to a page table entry
*
* @addr: Pointer to pointer to page table entry.
* @val: The page table entry
*
* Assigns a value to a page table entry pointed to by *@addr and increments
* *@addr according to the page table entry size.
*/
#if (VMW_PPN_SIZE == 8)
static void vmw_mob_assign_ppn(u32 **addr, dma_addr_t val)
{
*((u64 *) *addr) = val >> PAGE_SHIFT;
*addr += 2;
}
#else
static void vmw_mob_assign_ppn(u32 **addr, dma_addr_t val)
{
*(*addr)++ = val >> PAGE_SHIFT;
}
#endif
/*
* vmw_mob_build_pt - Build a pagetable
*
* @data_addr: Array of DMA addresses to the underlying buffer
* object's data pages.
* @num_data_pages: Number of buffer object data pages.
* @pt_pages: Array of page pointers to the page table pages.
*
* Returns the number of page table pages actually used.
* Uses atomic kmaps of highmem pages to avoid TLB thrashing.
*/
static unsigned long vmw_mob_build_pt(struct vmw_piter *data_iter,
unsigned long num_data_pages,
struct vmw_piter *pt_iter)
{
unsigned long pt_size = num_data_pages * VMW_PPN_SIZE;
unsigned long num_pt_pages = DIV_ROUND_UP(pt_size, PAGE_SIZE);
unsigned long pt_page;
u32 *addr, *save_addr;
unsigned long i;
struct page *page;
for (pt_page = 0; pt_page < num_pt_pages; ++pt_page) {
page = vmw_piter_page(pt_iter);
save_addr = addr = kmap_atomic(page);
for (i = 0; i < PAGE_SIZE / VMW_PPN_SIZE; ++i) {
vmw_mob_assign_ppn(&addr,
vmw_piter_dma_addr(data_iter));
if (unlikely(--num_data_pages == 0))
break;
WARN_ON(!vmw_piter_next(data_iter));
}
kunmap_atomic(save_addr);
vmw_piter_next(pt_iter);
}
return num_pt_pages;
}
/*
* vmw_mob_build_pt - Set up a multilevel mob pagetable
*
* @mob: Pointer to a mob whose page table needs setting up.
* @data_addr Array of DMA addresses to the buffer object's data
* pages.
* @num_data_pages: Number of buffer object data pages.
*
* Uses tail recursion to set up a multilevel mob page table.
*/
static void vmw_mob_pt_setup(struct vmw_mob *mob,
struct vmw_piter data_iter,
unsigned long num_data_pages)
{
unsigned long num_pt_pages = 0;
struct ttm_buffer_object *bo = &mob->pt_bo->tbo;
struct vmw_piter save_pt_iter = {0};
struct vmw_piter pt_iter;
const struct vmw_sg_table *vsgt;
int ret;
BUG_ON(num_data_pages == 0);
ret = ttm_bo_reserve(bo, false, true, NULL);
BUG_ON(ret != 0);
vsgt = vmw_bo_sg_table(bo);
vmw_piter_start(&pt_iter, vsgt, 0);
BUG_ON(!vmw_piter_next(&pt_iter));
mob->pt_level = 0;
while (likely(num_data_pages > 1)) {
++mob->pt_level;
BUG_ON(mob->pt_level > 2);
save_pt_iter = pt_iter;
num_pt_pages = vmw_mob_build_pt(&data_iter, num_data_pages,
&pt_iter);
data_iter = save_pt_iter;
num_data_pages = num_pt_pages;
}
mob->pt_root_page = vmw_piter_dma_addr(&save_pt_iter);
ttm_bo_unreserve(bo);
}
/*
* vmw_mob_destroy - Destroy a mob, unpopulating first if necessary.
*
* @mob: Pointer to a mob to destroy.
*/
void vmw_mob_destroy(struct vmw_mob *mob)
{
if (mob->pt_bo) {
vmw_bo_unpin_unlocked(&mob->pt_bo->tbo);
vmw_bo_unreference(&mob->pt_bo);
}
kfree(mob);
}
/*
* vmw_mob_unbind - Hide a mob from the device.
*
* @dev_priv: Pointer to a device private.
* @mob_id: Device id of the mob to unbind.
*/
void vmw_mob_unbind(struct vmw_private *dev_priv,
struct vmw_mob *mob)
{
struct {
SVGA3dCmdHeader header;
SVGA3dCmdDestroyGBMob body;
} *cmd;
int ret;
struct ttm_buffer_object *bo = &mob->pt_bo->tbo;
if (bo) {
ret = ttm_bo_reserve(bo, false, true, NULL);
/*
* Noone else should be using this buffer.
*/
BUG_ON(ret != 0);
}
cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
if (cmd) {
cmd->header.id = SVGA_3D_CMD_DESTROY_GB_MOB;
cmd->header.size = sizeof(cmd->body);
cmd->body.mobid = mob->id;
vmw_cmd_commit(dev_priv, sizeof(*cmd));
}
if (bo) {
vmw_bo_fence_single(bo, NULL);
ttm_bo_unreserve(bo);
}
vmw_fifo_resource_dec(dev_priv);
}
/*
* vmw_mob_bind - Make a mob visible to the device after first
* populating it if necessary.
*
* @dev_priv: Pointer to a device private.
* @mob: Pointer to the mob we're making visible.
* @data_addr: Array of DMA addresses to the data pages of the underlying
* buffer object.
* @num_data_pages: Number of data pages of the underlying buffer
* object.
* @mob_id: Device id of the mob to bind
*
* This function is intended to be interfaced with the ttm_tt backend
* code.
*/
int vmw_mob_bind(struct vmw_private *dev_priv,
struct vmw_mob *mob,
const struct vmw_sg_table *vsgt,
unsigned long num_data_pages,
int32_t mob_id)
{
int ret;
bool pt_set_up = false;
struct vmw_piter data_iter;
struct {
SVGA3dCmdHeader header;
SVGA3dCmdDefineGBMob64 body;
} *cmd;
mob->id = mob_id;
vmw_piter_start(&data_iter, vsgt, 0);
if (unlikely(!vmw_piter_next(&data_iter)))
return 0;
if (likely(num_data_pages == 1)) {
mob->pt_level = VMW_MOBFMT_PTDEPTH_0;
mob->pt_root_page = vmw_piter_dma_addr(&data_iter);
} else if (unlikely(mob->pt_bo == NULL)) {
ret = vmw_mob_pt_populate(dev_priv, mob);
if (unlikely(ret != 0))
return ret;
vmw_mob_pt_setup(mob, data_iter, num_data_pages);
pt_set_up = true;
mob->pt_level += VMW_MOBFMT_PTDEPTH_1 - SVGA3D_MOBFMT_PT_1;
}
vmw_fifo_resource_inc(dev_priv);
cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
if (unlikely(cmd == NULL))
goto out_no_cmd_space;
cmd->header.id = SVGA_3D_CMD_DEFINE_GB_MOB64;
cmd->header.size = sizeof(cmd->body);
cmd->body.mobid = mob_id;
cmd->body.ptDepth = mob->pt_level;
cmd->body.base = mob->pt_root_page >> PAGE_SHIFT;
cmd->body.sizeInBytes = num_data_pages * PAGE_SIZE;
vmw_cmd_commit(dev_priv, sizeof(*cmd));
return 0;
out_no_cmd_space:
vmw_fifo_resource_dec(dev_priv);
if (pt_set_up) {
vmw_bo_unpin_unlocked(&mob->pt_bo->tbo);
vmw_bo_unreference(&mob->pt_bo);
}
return -ENOMEM;
}
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