drm/xe/mmio: Use non-atomic writeq/readq variant for 32b

writeq() and readq() and other functions working on 64 bit variables
are not provided by 32b arch. For that it's needed to choose between
linux/io-64-nonatomic-hi-lo.h and linux/io-64-nonatomic-lo-hi.h,
spliting the read/write in 2 accesses. For xe driver, it doesn't matter
much, so just choose one and include in xe_mmio.h.

This also removes some ifdef CONFIG_64BIT we had around because of the
missing 64bit functions.
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_mmio.c

@@ -48,7 +48,6 @@ static int xe_set_dma_info(struct xe_device *xe)
 	return err;
 }
 
-#ifdef CONFIG_64BIT
 static int
 _resize_bar(struct xe_device *xe, int resno, resource_size_t size)
 {
@@ -132,9 +131,6 @@ static int xe_resize_lmem_bar(struct xe_device *xe, resource_size_t lmem_size)
 	pci_write_config_dword(pdev, PCI_COMMAND, pci_cmd);
 	return ret;
 }
-#else
-static int xe_resize_lmem_bar(struct xe_device *xe, resource_size_t lmem_size) { return 0; }
-#endif
 
 static bool xe_pci_resource_valid(struct pci_dev *pdev, int bar)
 {
@@ -236,10 +232,7 @@ int xe_mmio_probe_vram(struct xe_device *xe)
 		drm_warn(&xe->drm, "Restricting VRAM size to PCI resource size (0x%llx->0x%llx)\n",
 			 lmem_size, (u64)xe->mem.vram.size);
 
-#ifdef CONFIG_64BIT
 	xe->mem.vram.mapping = ioremap_wc(xe->mem.vram.io_start, xe->mem.vram.size);
-#endif
-
 	xe->mem.vram.size = min_t(u64, xe->mem.vram.size, usable_size);
 
 	drm_info(&xe->drm, "TOTAL VRAM: %pa, %pa\n", &xe->mem.vram.io_start, &xe->mem.vram.size);

drivers/gpu/drm/xe/xe_mmio.h

@@ -7,6 +7,7 @@
 #define _XE_MMIO_H_
 
 #include <linux/delay.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
 
 #include "xe_gt_types.h"