drm,io-mapping: Specify slot to use for atomic mappings

This is required should we ever attempt to use an io-mapping where
KM_USER0 is verboten, such as inside an IRQ context.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/i915/i915_gem.c

@@ -496,10 +496,10 @@ fast_user_write(struct io_mapping *mapping,
 	char *vaddr_atomic;
 	unsigned long unwritten;
 
-	vaddr_atomic = io_mapping_map_atomic_wc(mapping, page_base);
+	vaddr_atomic = io_mapping_map_atomic_wc(mapping, page_base, KM_USER0);
 	unwritten = __copy_from_user_inatomic_nocache(vaddr_atomic + page_offset,
 						      user_data, length);
-	io_mapping_unmap_atomic(vaddr_atomic);
+	io_mapping_unmap_atomic(vaddr_atomic, KM_USER0);
 	if (unwritten)
 		return -EFAULT;
 	return 0;
@@ -3487,7 +3487,8 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
 		reloc_offset = obj_priv->gtt_offset + reloc->offset;
 		reloc_page = io_mapping_map_atomic_wc(dev_priv->mm.gtt_mapping,
 						      (reloc_offset &
-						       ~(PAGE_SIZE - 1)));
+						       ~(PAGE_SIZE - 1)),
+						      KM_USER0);
 		reloc_entry = (uint32_t __iomem *)(reloc_page +
 						   (reloc_offset & (PAGE_SIZE - 1)));
 		reloc_val = target_obj_priv->gtt_offset + reloc->delta;
@@ -3498,7 +3499,7 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
 			  readl(reloc_entry), reloc_val);
 #endif
 		writel(reloc_val, reloc_entry);
-		io_mapping_unmap_atomic(reloc_page);
+		io_mapping_unmap_atomic(reloc_page, KM_USER0);
 
 		/* The updated presumed offset for this entry will be
 		 * copied back out to the user.

drivers/gpu/drm/i915/intel_overlay.c

@@ -185,7 +185,8 @@ static struct overlay_registers *intel_overlay_map_regs_atomic(struct intel_over
 
 	if (OVERLAY_NONPHYSICAL(overlay->dev)) {
 		regs = io_mapping_map_atomic_wc(dev_priv->mm.gtt_mapping,
-				overlay->reg_bo->gtt_offset);
+						overlay->reg_bo->gtt_offset,
+						KM_USER0);
 
 		if (!regs) {
 			DRM_ERROR("failed to map overlay regs in GTT\n");
@@ -200,7 +201,7 @@ static struct overlay_registers *intel_overlay_map_regs_atomic(struct intel_over
 static void intel_overlay_unmap_regs_atomic(struct intel_overlay *overlay)
 {
 	if (OVERLAY_NONPHYSICAL(overlay->dev))
-		io_mapping_unmap_atomic(overlay->virt_addr);
+		io_mapping_unmap_atomic(overlay->virt_addr, KM_USER0);
 
 	overlay->virt_addr = NULL;
 

drivers/gpu/drm/nouveau/nouveau_bios.c

@@ -2083,11 +2083,11 @@ peek_fb(struct drm_device *dev, struct io_mapping *fb,
 	uint32_t val = 0;
 
 	if (off < pci_resource_len(dev->pdev, 1)) {
-		uint32_t __iomem *p = io_mapping_map_atomic_wc(fb, off);
+		uint32_t __iomem *p = io_mapping_map_atomic_wc(fb, off, KM_USER0);
 
 		val = ioread32(p);
 
-		io_mapping_unmap_atomic(p);
+		io_mapping_unmap_atomic(p, KM_USER0);
 	}
 
 	return val;
@@ -2098,12 +2098,12 @@ poke_fb(struct drm_device *dev, struct io_mapping *fb,
 	uint32_t off, uint32_t val)
 {
 	if (off < pci_resource_len(dev->pdev, 1)) {
-		uint32_t __iomem *p = io_mapping_map_atomic_wc(fb, off);
+		uint32_t __iomem *p = io_mapping_map_atomic_wc(fb, off, KM_USER0);
 
 		iowrite32(val, p);
 		wmb();
 
-		io_mapping_unmap_atomic(p);
+		io_mapping_unmap_atomic(p, KM_USER0);
 	}
 }
 

include/linux/io-mapping.h

@@ -79,21 +79,23 @@ io_mapping_free(struct io_mapping *mapping)
 
 /* Atomic map/unmap */
 static inline void *
-io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset)
+io_mapping_map_atomic_wc(struct io_mapping *mapping,
+			 unsigned long offset,
+			 int slot)
 {
 	resource_size_t phys_addr;
 	unsigned long pfn;
 
 	BUG_ON(offset >= mapping->size);
 	phys_addr = mapping->base + offset;
 	pfn = (unsigned long) (phys_addr >> PAGE_SHIFT);
-	return iomap_atomic_prot_pfn(pfn, KM_USER0, mapping->prot);
+	return iomap_atomic_prot_pfn(pfn, slot, mapping->prot);
 }
 
 static inline void
-io_mapping_unmap_atomic(void *vaddr)
+io_mapping_unmap_atomic(void *vaddr, int slot)
 {
-	iounmap_atomic(vaddr, KM_USER0);
+	iounmap_atomic(vaddr, slot);
 }
 
 static inline void *
@@ -133,13 +135,15 @@ io_mapping_free(struct io_mapping *mapping)
 
 /* Atomic map/unmap */
 static inline void *
-io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset)
+io_mapping_map_atomic_wc(struct io_mapping *mapping,
+			 unsigned long offset,
+			 int slot)
 {
 	return ((char *) mapping) + offset;
 }
 
 static inline void
-io_mapping_unmap_atomic(void *vaddr)
+io_mapping_unmap_atomic(void *vaddr, int slot)
 {
 }