drm: Clean up many sparse warnings in i915.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/i915/i915_dma.c

@@ -76,7 +76,7 @@ int i915_wait_ring(struct drm_device * dev, int n, const char *caller)
  * Sets up the hardware status page for devices that need a physical address
  * in the register.
  */
-int i915_init_phys_hws(struct drm_device *dev)
+static int i915_init_phys_hws(struct drm_device *dev)
 {
 	drm_i915_private_t *dev_priv = dev->dev_private;
 	/* Program Hardware Status Page */
@@ -101,7 +101,7 @@ int i915_init_phys_hws(struct drm_device *dev)
  * Frees the hardware status page, whether it's a physical address or a virtual
  * address set up by the X Server.
  */
-void i915_free_hws(struct drm_device *dev)
+static void i915_free_hws(struct drm_device *dev)
 {
 	drm_i915_private_t *dev_priv = dev->dev_private;
 	if (dev_priv->status_page_dmah) {
@@ -145,8 +145,8 @@ static int i915_dma_cleanup(struct drm_device * dev)
 
 	if (dev_priv->ring.virtual_start) {
 		drm_core_ioremapfree(&dev_priv->ring.map, dev);
-		dev_priv->ring.virtual_start = 0;
-		dev_priv->ring.map.handle = 0;
+		dev_priv->ring.virtual_start = NULL;
+		dev_priv->ring.map.handle = NULL;
 		dev_priv->ring.map.size = 0;
 	}
 
@@ -827,9 +827,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 	base = drm_get_resource_start(dev, mmio_bar);
 	size = drm_get_resource_len(dev, mmio_bar);
 
-	ret = drm_addmap(dev, base, size, _DRM_REGISTERS,
-			 _DRM_KERNEL | _DRM_DRIVER,
-			 &dev_priv->mmio_map);
+	dev_priv->regs = ioremap(base, size);
 
 	i915_gem_load(dev);
 
@@ -867,8 +865,8 @@ int i915_driver_unload(struct drm_device *dev)
 
 	i915_free_hws(dev);
 
-	if (dev_priv->mmio_map)
-		drm_rmmap(dev, dev_priv->mmio_map);
+	if (dev_priv->regs != NULL)
+		iounmap(dev_priv->regs);
 
 	intel_opregion_free(dev);
 

drivers/gpu/drm/i915/i915_drv.h

@@ -110,8 +110,8 @@ struct intel_opregion {
 typedef struct drm_i915_private {
 	struct drm_device *dev;
 
+	void __iomem *regs;
 	drm_local_map_t *sarea;
-	drm_local_map_t *mmio_map;
 
 	drm_i915_sarea_t *sarea_priv;
 	drm_i915_ring_buffer_t ring;
@@ -553,12 +553,12 @@ extern void opregion_enable_asle(struct drm_device *dev);
 		LOCK_TEST_WITH_RETURN(dev, file_priv);			\
 } while (0)
 
-#define I915_READ(reg)          DRM_READ32(dev_priv->mmio_map, (reg))
-#define I915_WRITE(reg,val)     DRM_WRITE32(dev_priv->mmio_map, (reg), (val))
-#define I915_READ16(reg)	DRM_READ16(dev_priv->mmio_map, (reg))
-#define I915_WRITE16(reg,val)	DRM_WRITE16(dev_priv->mmio_map, (reg), (val))
-#define I915_READ8(reg)		DRM_READ8(dev_priv->mmio_map, (reg))
-#define I915_WRITE8(reg,val)	DRM_WRITE8(dev_priv->mmio_map, (reg), (val))
+#define I915_READ(reg)          readl(dev_priv->regs + (reg))
+#define I915_WRITE(reg, val)     writel(val, dev_priv->regs + (reg))
+#define I915_READ16(reg)	readw(dev_priv->regs + (reg))
+#define I915_WRITE16(reg, val)	writel(val, dev_priv->regs + (reg))
+#define I915_READ8(reg)		readb(dev_priv->regs + (reg))
+#define I915_WRITE8(reg, val)	writeb(val, dev_priv->regs + (reg))
 
 #define I915_VERBOSE 0
 

drivers/gpu/drm/i915/i915_gem.c

@@ -176,7 +176,8 @@ i915_gem_gtt_pwrite(struct drm_device *dev, struct drm_gem_object *obj,
 	ssize_t remain;
 	loff_t offset;
 	char __user *user_data;
-	char *vaddr;
+	char __iomem *vaddr;
+	char *vaddr_atomic;
 	int i, o, l;
 	int ret = 0;
 	unsigned long pfn;
@@ -219,16 +220,20 @@ i915_gem_gtt_pwrite(struct drm_device *dev, struct drm_gem_object *obj,
 		pfn = (dev->agp->base >> PAGE_SHIFT) + i;
 
 #ifdef CONFIG_HIGHMEM
-		/* kmap_atomic can't map IO pages on non-HIGHMEM kernels
+		/* This is a workaround for the low performance of iounmap
+		 * (approximate 10% cpu cost on normal 3D workloads).
+		 * kmap_atomic on HIGHMEM kernels happens to let us map card
+		 * memory without taking IPIs.  When the vmap rework lands
+		 * we should be able to dump this hack.
 		 */
-		vaddr = kmap_atomic_pfn(pfn, KM_USER0);
+		vaddr_atomic = kmap_atomic_pfn(pfn, KM_USER0);
 #if WATCH_PWRITE
 		DRM_INFO("pwrite i %d o %d l %d pfn %ld vaddr %p\n",
-			 i, o, l, pfn, vaddr);
+			 i, o, l, pfn, vaddr_atomic);
 #endif
-		unwritten = __copy_from_user_inatomic_nocache(vaddr + o,
+		unwritten = __copy_from_user_inatomic_nocache(vaddr_atomic + o,
 							      user_data, l);
-		kunmap_atomic(vaddr, KM_USER0);
+		kunmap_atomic(vaddr_atomic, KM_USER0);
 
 		if (unwritten)
 #endif /* CONFIG_HIGHMEM */
@@ -271,7 +276,7 @@ i915_gem_gtt_pwrite(struct drm_device *dev, struct drm_gem_object *obj,
 	return ret;
 }
 
-int
+static int
 i915_gem_shmem_pwrite(struct drm_device *dev, struct drm_gem_object *obj,
 		      struct drm_i915_gem_pwrite *args,
 		      struct drm_file *file_priv)
@@ -587,7 +592,7 @@ i915_add_request(struct drm_device *dev, uint32_t flush_domains)
  * Ensures that all commands in the ring are finished
  * before signalling the CPU
  */
-uint32_t
+static uint32_t
 i915_retire_commands(struct drm_device *dev)
 {
 	drm_i915_private_t *dev_priv = dev->dev_private;
@@ -734,7 +739,7 @@ i915_gem_retire_work_handler(struct work_struct *work)
  * Waits for a sequence number to be signaled, and cleans up the
  * request and object lists appropriately for that event.
  */
-int
+static int
 i915_wait_request(struct drm_device *dev, uint32_t seqno)
 {
 	drm_i915_private_t *dev_priv = dev->dev_private;
@@ -1483,7 +1488,7 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
 	struct drm_i915_gem_object *obj_priv = obj->driver_private;
 	int i, ret;
 	uint32_t last_reloc_offset = -1;
-	void *reloc_page = NULL;
+	void __iomem *reloc_page = NULL;
 
 	/* Choose the GTT offset for our buffer and put it there. */
 	ret = i915_gem_object_pin(obj, (uint32_t) entry->alignment);
@@ -1500,8 +1505,8 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
 	for (i = 0; i < entry->relocation_count; i++) {
 		struct drm_gem_object *target_obj;
 		struct drm_i915_gem_object *target_obj_priv;
-		uint32_t reloc_val, reloc_offset, *reloc_entry;
-		int ret;
+		uint32_t reloc_val, reloc_offset;
+		uint32_t __iomem *reloc_entry;
 
 		ret = copy_from_user(&reloc, relocs + i, sizeof(reloc));
 		if (ret != 0) {
@@ -1624,7 +1629,7 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
 			}
 		}
 
-		reloc_entry = (uint32_t *)((char *)reloc_page +
+		reloc_entry = (uint32_t __iomem *)(reloc_page +
 					   (reloc_offset & (PAGE_SIZE - 1)));
 		reloc_val = target_obj_priv->gtt_offset + reloc.delta;