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vmwgfx: Implement GMR2 

Guest Memory Regions 2 is a way to bind pages to the GPU, but using
the FIFO instead of an io-submitted descriptor chain.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Jakob Bornecantz <jakob@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Thomas Hellstrom 2011-08-31 09:42:55 +02:00 committed by Dave Airlie
parent dcca28627d
commit 2de59d0161
1 changed files with 80 additions and 1 deletions
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81
drivers/gpu/drm/vmwgfx/vmwgfx_gmr.c
View File

@ -1,6 +1,6 @@
/**************************************************************************
*
* Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
* Copyright © 2009-2011 VMware, Inc., Palo Alto, CA., USA
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
@ -29,6 +29,77 @@
#include "drmP.h"
#include "ttm/ttm_bo_driver.h"
#define VMW_PPN_SIZE sizeof(unsigned long)
static int vmw_gmr2_bind(struct vmw_private *dev_priv,
struct page *pages[],
unsigned long num_pages,
int gmr_id)
{
SVGAFifoCmdDefineGMR2 define_cmd;
SVGAFifoCmdRemapGMR2 remap_cmd;
uint32_t define_size = sizeof(define_cmd) + 4;
uint32_t remap_size = VMW_PPN_SIZE * num_pages + sizeof(remap_cmd) + 4;
uint32_t *cmd;
uint32_t *cmd_orig;
uint32_t i;
cmd_orig = cmd = vmw_fifo_reserve(dev_priv, define_size + remap_size);
if (unlikely(cmd == NULL))
return -ENOMEM;
define_cmd.gmrId = gmr_id;
define_cmd.numPages = num_pages;
remap_cmd.gmrId = gmr_id;
remap_cmd.flags = (VMW_PPN_SIZE > sizeof(*cmd)) ?
SVGA_REMAP_GMR2_PPN64 : SVGA_REMAP_GMR2_PPN32;
remap_cmd.offsetPages = 0;
remap_cmd.numPages = num_pages;
*cmd++ = SVGA_CMD_DEFINE_GMR2;
memcpy(cmd, &define_cmd, sizeof(define_cmd));
cmd += sizeof(define_cmd) / sizeof(uint32);
*cmd++ = SVGA_CMD_REMAP_GMR2;
memcpy(cmd, &remap_cmd, sizeof(remap_cmd));
cmd += sizeof(remap_cmd) / sizeof(uint32);
for (i = 0; i < num_pages; ++i) {
if (VMW_PPN_SIZE > 4)
*cmd = page_to_pfn(*pages++);
else
*((uint64_t *)cmd) = page_to_pfn(*pages++);
cmd += VMW_PPN_SIZE / sizeof(*cmd);
}
vmw_fifo_commit(dev_priv, define_size + remap_size);
return 0;
}
static void vmw_gmr2_unbind(struct vmw_private *dev_priv,
int gmr_id)
{
SVGAFifoCmdDefineGMR2 define_cmd;
uint32_t define_size = sizeof(define_cmd) + 4;
uint32_t *cmd;
cmd = vmw_fifo_reserve(dev_priv, define_size);
if (unlikely(cmd == NULL)) {
DRM_ERROR("GMR2 unbind failed.\n");
return;
}
define_cmd.gmrId = gmr_id;
define_cmd.numPages = 0;
*cmd++ = SVGA_CMD_DEFINE_GMR2;
memcpy(cmd, &define_cmd, sizeof(define_cmd));
vmw_fifo_commit(dev_priv, define_size);
}
/**
* FIXME: Adjust to the ttm lowmem / highmem storage to minimize
* the number of used descriptors.
@ -170,6 +241,9 @@ int vmw_gmr_bind(struct vmw_private *dev_priv,
struct list_head desc_pages;
int ret;
if (likely(dev_priv->capabilities & SVGA_CAP_GMR2))
return vmw_gmr2_bind(dev_priv, pages, num_pages, gmr_id);
if (unlikely(!(dev_priv->capabilities & SVGA_CAP_GMR)))
return -EINVAL;
@ -192,6 +266,11 @@ int vmw_gmr_bind(struct vmw_private *dev_priv,
void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id)
{
if (likely(dev_priv->capabilities & SVGA_CAP_GMR2)) {
vmw_gmr2_unbind(dev_priv, gmr_id);
return;
}
mutex_lock(&dev_priv->hw_mutex);
vmw_write(dev_priv, SVGA_REG_GMR_ID, gmr_id);
wmb();