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-rw-r--r--drivers/gpu/drm/i915/i915_drv.h5
-rw-r--r--drivers/gpu/drm/i915/i915_gem.c130
-rw-r--r--drivers/gpu/drm/i915/i915_gem_tiling.c111
-rw-r--r--include/drm/i915_drm.h3
4 files changed, 235 insertions, 14 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index efcd610d4fca..bccd4146d55c 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -446,6 +446,9 @@ struct drm_i915_gem_object {
uint32_t tiling_mode;
uint32_t stride;
+ /** Record of address bit 17 of each page at last unbind. */
+ long *bit_17;
+
/** AGP mapping type (AGP_USER_MEMORY or AGP_USER_CACHED_MEMORY */
uint32_t agp_type;
@@ -640,6 +643,8 @@ void i915_gem_object_put_pages(struct drm_gem_object *obj);
/* i915_gem_tiling.c */
void i915_gem_detect_bit_6_swizzle(struct drm_device *dev);
+void i915_gem_object_do_bit_17_swizzle(struct drm_gem_object *obj);
+void i915_gem_object_save_bit_17_swizzle(struct drm_gem_object *obj);
/* i915_gem_debug.c */
void i915_gem_dump_object(struct drm_gem_object *obj, int len,
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 3a1189d94a9a..6dca9fc7c1db 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -155,6 +155,15 @@ fast_shmem_read(struct page **pages,
return 0;
}
+static int i915_gem_object_needs_bit17_swizzle(struct drm_gem_object *obj)
+{
+ drm_i915_private_t *dev_priv = obj->dev->dev_private;
+ struct drm_i915_gem_object *obj_priv = obj->driver_private;
+
+ return dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_9_10_17 &&
+ obj_priv->tiling_mode != I915_TILING_NONE;
+}
+
static inline int
slow_shmem_copy(struct page *dst_page,
int dst_offset,
@@ -182,6 +191,64 @@ slow_shmem_copy(struct page *dst_page,
return 0;
}
+static inline int
+slow_shmem_bit17_copy(struct page *gpu_page,
+ int gpu_offset,
+ struct page *cpu_page,
+ int cpu_offset,
+ int length,
+ int is_read)
+{
+ char *gpu_vaddr, *cpu_vaddr;
+
+ /* Use the unswizzled path if this page isn't affected. */
+ if ((page_to_phys(gpu_page) & (1 << 17)) == 0) {
+ if (is_read)
+ return slow_shmem_copy(cpu_page, cpu_offset,
+ gpu_page, gpu_offset, length);
+ else
+ return slow_shmem_copy(gpu_page, gpu_offset,
+ cpu_page, cpu_offset, length);
+ }
+
+ gpu_vaddr = kmap_atomic(gpu_page, KM_USER0);
+ if (gpu_vaddr == NULL)
+ return -ENOMEM;
+
+ cpu_vaddr = kmap_atomic(cpu_page, KM_USER1);
+ if (cpu_vaddr == NULL) {
+ kunmap_atomic(gpu_vaddr, KM_USER0);
+ return -ENOMEM;
+ }
+
+ /* Copy the data, XORing A6 with A17 (1). The user already knows he's
+ * XORing with the other bits (A9 for Y, A9 and A10 for X)
+ */
+ while (length > 0) {
+ int cacheline_end = ALIGN(gpu_offset + 1, 64);
+ int this_length = min(cacheline_end - gpu_offset, length);
+ int swizzled_gpu_offset = gpu_offset ^ 64;
+
+ if (is_read) {
+ memcpy(cpu_vaddr + cpu_offset,
+ gpu_vaddr + swizzled_gpu_offset,
+ this_length);
+ } else {
+ memcpy(gpu_vaddr + swizzled_gpu_offset,
+ cpu_vaddr + cpu_offset,
+ this_length);
+ }
+ cpu_offset += this_length;
+ gpu_offset += this_length;
+ length -= this_length;
+ }
+
+ kunmap_atomic(cpu_vaddr, KM_USER1);
+ kunmap_atomic(gpu_vaddr, KM_USER0);
+
+ return 0;
+}
+
/**
* This is the fast shmem pread path, which attempts to copy_from_user directly
* from the backing pages of the object to the user's address space. On a
@@ -270,6 +337,7 @@ i915_gem_shmem_pread_slow(struct drm_device *dev, struct drm_gem_object *obj,
int page_length;
int ret;
uint64_t data_ptr = args->data_ptr;
+ int do_bit17_swizzling;
remain = args->size;
@@ -294,6 +362,8 @@ i915_gem_shmem_pread_slow(struct drm_device *dev, struct drm_gem_object *obj,
goto fail_put_user_pages;
}
+ do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
+
mutex_lock(&dev->struct_mutex);
ret = i915_gem_object_get_pages(obj);
@@ -328,11 +398,20 @@ i915_gem_shmem_pread_slow(struct drm_device *dev, struct drm_gem_object *obj,
if ((data_page_offset + page_length) > PAGE_SIZE)
page_length = PAGE_SIZE - data_page_offset;
- ret = slow_shmem_copy(user_pages[data_page_index],
- data_page_offset,
- obj_priv->pages[shmem_page_index],
- shmem_page_offset,
- page_length);
+ if (do_bit17_swizzling) {
+ ret = slow_shmem_bit17_copy(obj_priv->pages[shmem_page_index],
+ shmem_page_offset,
+ user_pages[data_page_index],
+ data_page_offset,
+ page_length,
+ 1);
+ } else {
+ ret = slow_shmem_copy(user_pages[data_page_index],
+ data_page_offset,
+ obj_priv->pages[shmem_page_index],
+ shmem_page_offset,
+ page_length);
+ }
if (ret)
goto fail_put_pages;
@@ -384,9 +463,14 @@ i915_gem_pread_ioctl(struct drm_device *dev, void *data,
return -EINVAL;
}
- ret = i915_gem_shmem_pread_fast(dev, obj, args, file_priv);
- if (ret != 0)
+ if (i915_gem_object_needs_bit17_swizzle(obj)) {
ret = i915_gem_shmem_pread_slow(dev, obj, args, file_priv);
+ } else {
+ ret = i915_gem_shmem_pread_fast(dev, obj, args, file_priv);
+ if (ret != 0)
+ ret = i915_gem_shmem_pread_slow(dev, obj, args,
+ file_priv);
+ }
drm_gem_object_unreference(obj);
@@ -728,6 +812,7 @@ i915_gem_shmem_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
int page_length;
int ret;
uint64_t data_ptr = args->data_ptr;
+ int do_bit17_swizzling;
remain = args->size;
@@ -752,6 +837,8 @@ i915_gem_shmem_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
goto fail_put_user_pages;
}
+ do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
+
mutex_lock(&dev->struct_mutex);
ret = i915_gem_object_get_pages(obj);
@@ -786,11 +873,20 @@ i915_gem_shmem_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
if ((data_page_offset + page_length) > PAGE_SIZE)
page_length = PAGE_SIZE - data_page_offset;
- ret = slow_shmem_copy(obj_priv->pages[shmem_page_index],
- shmem_page_offset,
- user_pages[data_page_index],
- data_page_offset,
- page_length);
+ if (do_bit17_swizzling) {
+ ret = slow_shmem_bit17_copy(obj_priv->pages[shmem_page_index],
+ shmem_page_offset,
+ user_pages[data_page_index],
+ data_page_offset,
+ page_length,
+ 0);
+ } else {
+ ret = slow_shmem_copy(obj_priv->pages[shmem_page_index],
+ shmem_page_offset,
+ user_pages[data_page_index],
+ data_page_offset,
+ page_length);
+ }
if (ret)
goto fail_put_pages;
@@ -855,6 +951,8 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
ret = i915_gem_gtt_pwrite_slow(dev, obj, args,
file_priv);
}
+ } else if (i915_gem_object_needs_bit17_swizzle(obj)) {
+ ret = i915_gem_shmem_pwrite_slow(dev, obj, args, file_priv);
} else {
ret = i915_gem_shmem_pwrite_fast(dev, obj, args, file_priv);
if (ret == -EFAULT) {
@@ -1298,6 +1396,9 @@ i915_gem_object_put_pages(struct drm_gem_object *obj)
if (--obj_priv->pages_refcount != 0)
return;
+ if (obj_priv->tiling_mode != I915_TILING_NONE)
+ i915_gem_object_save_bit_17_swizzle(obj);
+
for (i = 0; i < page_count; i++)
if (obj_priv->pages[i] != NULL) {
if (obj_priv->dirty)
@@ -1923,6 +2024,10 @@ i915_gem_object_get_pages(struct drm_gem_object *obj)
}
obj_priv->pages[i] = page;
}
+
+ if (obj_priv->tiling_mode != I915_TILING_NONE)
+ i915_gem_object_do_bit_17_swizzle(obj);
+
return 0;
}
@@ -3601,6 +3706,7 @@ void i915_gem_free_object(struct drm_gem_object *obj)
i915_gem_free_mmap_offset(obj);
drm_free(obj_priv->page_cpu_valid, 1, DRM_MEM_DRIVER);
+ kfree(obj_priv->bit_17);
drm_free(obj->driver_private, 1, DRM_MEM_DRIVER);
}
diff --git a/drivers/gpu/drm/i915/i915_gem_tiling.c b/drivers/gpu/drm/i915/i915_gem_tiling.c
index 6be3f927c86a..f27e523c764f 100644
--- a/drivers/gpu/drm/i915/i915_gem_tiling.c
+++ b/drivers/gpu/drm/i915/i915_gem_tiling.c
@@ -25,6 +25,8 @@
*
*/
+#include "linux/string.h"
+#include "linux/bitops.h"
#include "drmP.h"
#include "drm.h"
#include "i915_drm.h"
@@ -127,8 +129,8 @@ i915_gem_detect_bit_6_swizzle(struct drm_device *dev)
swizzle_y = I915_BIT_6_SWIZZLE_9_11;
} else {
/* Bit 17 swizzling by the CPU in addition. */
- swizzle_x = I915_BIT_6_SWIZZLE_UNKNOWN;
- swizzle_y = I915_BIT_6_SWIZZLE_UNKNOWN;
+ swizzle_x = I915_BIT_6_SWIZZLE_9_10_17;
+ swizzle_y = I915_BIT_6_SWIZZLE_9_17;
}
break;
}
@@ -288,6 +290,19 @@ i915_gem_set_tiling(struct drm_device *dev, void *data,
args->swizzle_mode = dev_priv->mm.bit_6_swizzle_x;
else
args->swizzle_mode = dev_priv->mm.bit_6_swizzle_y;
+
+ /* Hide bit 17 swizzling from the user. This prevents old Mesa
+ * from aborting the application on sw fallbacks to bit 17,
+ * and we use the pread/pwrite bit17 paths to swizzle for it.
+ * If there was a user that was relying on the swizzle
+ * information for drm_intel_bo_map()ed reads/writes this would
+ * break it, but we don't have any of those.
+ */
+ if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_17)
+ args->swizzle_mode = I915_BIT_6_SWIZZLE_9;
+ if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_10_17)
+ args->swizzle_mode = I915_BIT_6_SWIZZLE_9_10;
+
/* If we can't handle the swizzling, make it untiled. */
if (args->swizzle_mode == I915_BIT_6_SWIZZLE_UNKNOWN) {
args->tiling_mode = I915_TILING_NONE;
@@ -354,8 +369,100 @@ i915_gem_get_tiling(struct drm_device *dev, void *data,
DRM_ERROR("unknown tiling mode\n");
}
+ /* Hide bit 17 from the user -- see comment in i915_gem_set_tiling */
+ if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_17)
+ args->swizzle_mode = I915_BIT_6_SWIZZLE_9;
+ if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_10_17)
+ args->swizzle_mode = I915_BIT_6_SWIZZLE_9_10;
+
drm_gem_object_unreference(obj);
mutex_unlock(&dev->struct_mutex);
return 0;
}
+
+/**
+ * Swap every 64 bytes of this page around, to account for it having a new
+ * bit 17 of its physical address and therefore being interpreted differently
+ * by the GPU.
+ */
+static int
+i915_gem_swizzle_page(struct page *page)
+{
+ char *vaddr;
+ int i;
+ char temp[64];
+
+ vaddr = kmap(page);
+ if (vaddr == NULL)
+ return -ENOMEM;
+
+ for (i = 0; i < PAGE_SIZE; i += 128) {
+ memcpy(temp, &vaddr[i], 64);
+ memcpy(&vaddr[i], &vaddr[i + 64], 64);
+ memcpy(&vaddr[i + 64], temp, 64);
+ }
+
+ kunmap(page);
+
+ return 0;
+}
+
+void
+i915_gem_object_do_bit_17_swizzle(struct drm_gem_object *obj)
+{
+ struct drm_device *dev = obj->dev;
+ drm_i915_private_t *dev_priv = dev->dev_private;
+ struct drm_i915_gem_object *obj_priv = obj->driver_private;
+ int page_count = obj->size >> PAGE_SHIFT;
+ int i;
+
+ if (dev_priv->mm.bit_6_swizzle_x != I915_BIT_6_SWIZZLE_9_10_17)
+ return;
+
+ if (obj_priv->bit_17 == NULL)
+ return;
+
+ for (i = 0; i < page_count; i++) {
+ char new_bit_17 = page_to_phys(obj_priv->pages[i]) >> 17;
+ if ((new_bit_17 & 0x1) !=
+ (test_bit(i, obj_priv->bit_17) != 0)) {
+ int ret = i915_gem_swizzle_page(obj_priv->pages[i]);
+ if (ret != 0) {
+ DRM_ERROR("Failed to swizzle page\n");
+ return;
+ }
+ set_page_dirty(obj_priv->pages[i]);
+ }
+ }
+}
+
+void
+i915_gem_object_save_bit_17_swizzle(struct drm_gem_object *obj)
+{
+ struct drm_device *dev = obj->dev;
+ drm_i915_private_t *dev_priv = dev->dev_private;
+ struct drm_i915_gem_object *obj_priv = obj->driver_private;
+ int page_count = obj->size >> PAGE_SHIFT;
+ int i;
+
+ if (dev_priv->mm.bit_6_swizzle_x != I915_BIT_6_SWIZZLE_9_10_17)
+ return;
+
+ if (obj_priv->bit_17 == NULL) {
+ obj_priv->bit_17 = kmalloc(BITS_TO_LONGS(page_count) *
+ sizeof(long), GFP_KERNEL);
+ if (obj_priv->bit_17 == NULL) {
+ DRM_ERROR("Failed to allocate memory for bit 17 "
+ "record\n");
+ return;
+ }
+ }
+
+ for (i = 0; i < page_count; i++) {
+ if (page_to_phys(obj_priv->pages[i]) & (1 << 17))
+ __set_bit(i, obj_priv->bit_17);
+ else
+ __clear_bit(i, obj_priv->bit_17);
+ }
+}
diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h
index 67e3353a56d6..95962fa8398a 100644
--- a/include/drm/i915_drm.h
+++ b/include/drm/i915_drm.h
@@ -594,6 +594,9 @@ struct drm_i915_gem_busy {
#define I915_BIT_6_SWIZZLE_9_10_11 4
/* Not seen by userland */
#define I915_BIT_6_SWIZZLE_UNKNOWN 5
+/* Seen by userland. */
+#define I915_BIT_6_SWIZZLE_9_17 6
+#define I915_BIT_6_SWIZZLE_9_10_17 7
struct drm_i915_gem_set_tiling {
/** Handle of the buffer to have its tiling state updated */
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-05 21:19:31 +0000