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>

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_gmr.c b/drivers/gpu/drm/vmwgfx/vmwgfx_gmr.c
index de0c594..f4e7763 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_gmr.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_gmr.c
@@ -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();