drm/vmwgfx: fix a warning due to missing dma_parms

Booting up with DMA_API_DEBUG_SG=y generates a warning due to the driver
forgot to set dma_parms appropriately. Set it just after vmw_dma_masks()
in vmw_driver_load().

DMA-API: vmwgfx 0000:00:0f.0: mapping sg segment longer than device
claims to support [len=2097152] [max=65536]
WARNING: CPU: 2 PID: 261 at kernel/dma/debug.c:1232
debug_dma_map_sg+0x360/0x480
Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop
Reference Platform, BIOS 6.00 04/13/2018
RIP: 0010:debug_dma_map_sg+0x360/0x480
Call Trace:
 vmw_ttm_map_dma+0x3b1/0x5b0 [vmwgfx]
 vmw_bo_map_dma+0x25/0x30 [vmwgfx]
 vmw_otables_setup+0x2a8/0x750 [vmwgfx]
 vmw_request_device_late+0x78/0xc0 [vmwgfx]
 vmw_request_device+0xee/0x4e0 [vmwgfx]
 vmw_driver_load.cold+0x757/0xd84 [vmwgfx]
 drm_dev_register+0x1ff/0x340 [drm]
 drm_get_pci_dev+0x110/0x290 [drm]
 vmw_probe+0x15/0x20 [vmwgfx]
 local_pci_probe+0x7a/0xc0
 pci_device_probe+0x1b9/0x290
 really_probe+0x1b5/0x630
 driver_probe_device+0xa3/0x1a0
 device_driver_attach+0x94/0xa0
 __driver_attach+0xdd/0x1c0
 bus_for_each_dev+0xfe/0x150
 driver_attach+0x2d/0x40
 bus_add_driver+0x290/0x350
 driver_register+0xdc/0x1d0
 __pci_register_driver+0xda/0xf0
 vmwgfx_init+0x34/0x1000 [vmwgfx]
 do_one_initcall+0xe5/0x40a
 do_init_module+0x10f/0x3a0
 load_module+0x16a5/0x1a40
 __se_sys_finit_module+0x183/0x1c0
 __x64_sys_finit_module+0x43/0x50
 do_syscall_64+0xc8/0x606
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Fixes: fb1d9738 ("drm/vmwgfx: Add DRM driver for VMware Virtual GPU")
Co-developed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Qian Cai <cai@lca.pw>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>

drivers/gpu/drm/vmwgfx/vmwgfx_drv.c

@@ -747,6 +747,9 @@ static int vmw_driver_load(struct drm_device *dev, unsigned long chipset)
 	if (unlikely(ret != 0))
 		goto out_err0;
 
+	dma_set_max_seg_size(dev->dev, min_t(unsigned int, U32_MAX & PAGE_MASK,
+					     SCATTERLIST_MAX_SEGMENT));
+
 	if (dev_priv->capabilities & SVGA_CAP_GMR2) {
 		DRM_INFO("Max GMR ids is %u\n",
 			 (unsigned)dev_priv->max_gmr_ids);