[PATCH v4 1/2] intel: 48b ppgtt support (EXEC_OBJECT_SUPPORTS_48B_ADDRESS flag)
Michał Winiarski
michal.winiarski at intel.com
Mon Sep 14 06:54:04 PDT 2015
On Thu, Sep 03, 2015 at 03:23:58PM +0100, Michel Thierry wrote:
> Gen8+ supports 48-bit virtual addresses, but some objects must always be
> allocated inside the 32-bit address range.
>
> In specific, any resource used with flat/heapless (0x00000000-0xfffff000)
> General State Heap (GSH) or Instruction State Heap (ISH) must be in a
> 32-bit range, because the General State Offset and Instruction State Offset
> are limited to 32-bits.
>
> The i915 driver has been modified to provide a flag to set when the 4GB
> limit is not necessary in a given bo (EXEC_OBJECT_SUPPORTS_48B_ADDRESS).
> 48-bit range will only be used when explicitly requested.
>
> Callers to the existing drm_intel_bo_emit_reloc function should set the
> use_48b_address_range flag beforehand, in order to use full ppgtt range.
>
> v2: Make set/clear functions nops on pre-gen8 platforms, and use them
> internally in emit_reloc functions (Ben)
> s/48BADDRESS/48B_ADDRESS/ (Dave)
> v3: Keep set/clear functions internal, no-one needs to use them directly.
> v4: Don't set 48bit-support flag in emit reloc, check for ppgtt type
> before enabling set/clear function, print full offsets in debug
> statements, using port of lower_32_bits and upper_32_bits from linux
> kernel (Michał)
>
> References: http://lists.freedesktop.org/archives/intel-gfx/2015-July/072612.html
> Cc: Ben Widawsky <ben at bwidawsk.net>
> Cc: Michał Winiarski <michal.winiarski at intel.com>
+Kristian
LGTM.
Acked-by: Michał Winiarski <michal.winiarski at intel.com>
> Signed-off-by: Michel Thierry <michel.thierry at intel.com>
> ---
> include/drm/i915_drm.h | 3 +-
> intel/intel_bufmgr.c | 11 ++++++
> intel/intel_bufmgr.h | 1 +
> intel/intel_bufmgr_gem.c | 88 +++++++++++++++++++++++++++++++++++++----------
> intel/intel_bufmgr_priv.h | 14 ++++++++
> 5 files changed, 97 insertions(+), 20 deletions(-)
>
> diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h
> index ded43b1..426b25c 100644
> --- a/include/drm/i915_drm.h
> +++ b/include/drm/i915_drm.h
> @@ -680,7 +680,8 @@ struct drm_i915_gem_exec_object2 {
> #define EXEC_OBJECT_NEEDS_FENCE (1<<0)
> #define EXEC_OBJECT_NEEDS_GTT (1<<1)
> #define EXEC_OBJECT_WRITE (1<<2)
> -#define __EXEC_OBJECT_UNKNOWN_FLAGS -(EXEC_OBJECT_WRITE<<1)
> +#define EXEC_OBJECT_SUPPORTS_48B_ADDRESS (1<<3)
> +#define __EXEC_OBJECT_UNKNOWN_FLAGS -(EXEC_OBJECT_SUPPORTS_48B_ADDRESS<<1)
> __u64 flags;
>
> __u64 rsvd1;
> diff --git a/intel/intel_bufmgr.c b/intel/intel_bufmgr.c
> index 14ea9f9..0856e60 100644
> --- a/intel/intel_bufmgr.c
> +++ b/intel/intel_bufmgr.c
> @@ -293,6 +293,17 @@ drm_intel_bo_madvise(drm_intel_bo *bo, int madv)
> }
>
> int
> +drm_intel_bo_use_48b_address_range(drm_intel_bo *bo, uint32_t enable)
> +{
> + if (bo->bufmgr->bo_use_48b_address_range) {
> + bo->bufmgr->bo_use_48b_address_range(bo, enable);
> + return 0;
> + }
> +
> + return -ENODEV;
> +}
> +
> +int
> drm_intel_bo_references(drm_intel_bo *bo, drm_intel_bo *target_bo)
> {
> return bo->bufmgr->bo_references(bo, target_bo);
> diff --git a/intel/intel_bufmgr.h b/intel/intel_bufmgr.h
> index 95eecb8..a14c78f 100644
> --- a/intel/intel_bufmgr.h
> +++ b/intel/intel_bufmgr.h
> @@ -164,6 +164,7 @@ int drm_intel_bo_get_tiling(drm_intel_bo *bo, uint32_t * tiling_mode,
> int drm_intel_bo_flink(drm_intel_bo *bo, uint32_t * name);
> int drm_intel_bo_busy(drm_intel_bo *bo);
> int drm_intel_bo_madvise(drm_intel_bo *bo, int madv);
> +int drm_intel_bo_use_48b_address_range(drm_intel_bo *bo, uint32_t enable);
>
> int drm_intel_bo_disable_reuse(drm_intel_bo *bo);
> int drm_intel_bo_is_reusable(drm_intel_bo *bo);
> diff --git a/intel/intel_bufmgr_gem.c b/intel/intel_bufmgr_gem.c
> index 2723e21..09d82d2 100644
> --- a/intel/intel_bufmgr_gem.c
> +++ b/intel/intel_bufmgr_gem.c
> @@ -83,6 +83,22 @@
> #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
> #define MAX2(A, B) ((A) > (B) ? (A) : (B))
>
> +/**
> + * upper_32_bits - return bits 32-63 of a number
> + * @n: the number we're accessing
> + *
> + * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
> + * the "right shift count >= width of type" warning when that quantity is
> + * 32-bits.
> + */
> +#define upper_32_bits(n) ((__u32)(((n) >> 16) >> 16))
> +
> +/**
> + * lower_32_bits - return bits 0-31 of a number
> + * @n: the number we're accessing
> + */
> +#define lower_32_bits(n) ((__u32)(n))
> +
> typedef struct _drm_intel_bo_gem drm_intel_bo_gem;
>
> struct drm_intel_gem_bo_bucket {
> @@ -237,6 +253,15 @@ struct _drm_intel_bo_gem {
> bool is_userptr;
>
> /**
> + * Boolean of whether this buffer can be placed in the full 48-bit
> + * address range on gen8+.
> + *
> + * By default, buffers will be keep in a 32-bit range, unless this
> + * flag is explicitly set.
> + */
> + bool use_48b_address_range;
> +
> + /**
> * Size in bytes of this buffer and its relocation descendents.
> *
> * Used to avoid costly tree walking in
> @@ -395,14 +420,16 @@ drm_intel_gem_dump_validation_list(drm_intel_bufmgr_gem *bufmgr_gem)
> drm_intel_bo_gem *target_gem =
> (drm_intel_bo_gem *) target_bo;
>
> - DBG("%2d: %d (%s)@0x%08llx -> "
> - "%d (%s)@0x%08lx + 0x%08x\n",
> + DBG("%2d: %d (%s)@0x%08x %08x -> "
> + "%d (%s)@0x%08x %08x + 0x%08x\n",
> i,
> bo_gem->gem_handle, bo_gem->name,
> - (unsigned long long)bo_gem->relocs[j].offset,
> + upper_32_bits(bo_gem->relocs[j].offset),
> + lower_32_bits(bo_gem->relocs[j].offset),
> target_gem->gem_handle,
> target_gem->name,
> - target_bo->offset64,
> + upper_32_bits(target_bo->offset64),
> + lower_32_bits(target_bo->offset64),
> bo_gem->relocs[j].delta);
> }
> }
> @@ -468,11 +495,15 @@ drm_intel_add_validate_buffer2(drm_intel_bo *bo, int need_fence)
> drm_intel_bufmgr_gem *bufmgr_gem = (drm_intel_bufmgr_gem *)bo->bufmgr;
> drm_intel_bo_gem *bo_gem = (drm_intel_bo_gem *)bo;
> int index;
> + int flags = 0;
> +
> + if (need_fence)
> + flags |= EXEC_OBJECT_NEEDS_FENCE;
> + if (bo_gem->use_48b_address_range)
> + flags |= EXEC_OBJECT_SUPPORTS_48B_ADDRESS;
>
> if (bo_gem->validate_index != -1) {
> - if (need_fence)
> - bufmgr_gem->exec2_objects[bo_gem->validate_index].flags |=
> - EXEC_OBJECT_NEEDS_FENCE;
> + bufmgr_gem->exec2_objects[bo_gem->validate_index].flags |= flags;
> return;
> }
>
> @@ -501,13 +532,9 @@ drm_intel_add_validate_buffer2(drm_intel_bo *bo, int need_fence)
> bufmgr_gem->exec2_objects[index].alignment = bo->align;
> bufmgr_gem->exec2_objects[index].offset = 0;
> bufmgr_gem->exec_bos[index] = bo;
> - bufmgr_gem->exec2_objects[index].flags = 0;
> + bufmgr_gem->exec2_objects[index].flags = flags;
> bufmgr_gem->exec2_objects[index].rsvd1 = 0;
> bufmgr_gem->exec2_objects[index].rsvd2 = 0;
> - if (need_fence) {
> - bufmgr_gem->exec2_objects[index].flags |=
> - EXEC_OBJECT_NEEDS_FENCE;
> - }
> bufmgr_gem->exec_count++;
> }
>
> @@ -780,6 +807,7 @@ retry:
> bo_gem->used_as_reloc_target = false;
> bo_gem->has_error = false;
> bo_gem->reusable = true;
> + bo_gem->use_48b_address_range = false;
>
> drm_intel_bo_gem_set_in_aperture_size(bufmgr_gem, bo_gem, alignment);
>
> @@ -926,6 +954,7 @@ drm_intel_gem_bo_alloc_userptr(drm_intel_bufmgr *bufmgr,
> bo_gem->used_as_reloc_target = false;
> bo_gem->has_error = false;
> bo_gem->reusable = false;
> + bo_gem->use_48b_address_range = false;
>
> drm_intel_bo_gem_set_in_aperture_size(bufmgr_gem, bo_gem, 0);
>
> @@ -1081,6 +1110,7 @@ drm_intel_bo_gem_create_from_name(drm_intel_bufmgr *bufmgr,
> bo_gem->bo.handle = open_arg.handle;
> bo_gem->global_name = handle;
> bo_gem->reusable = false;
> + bo_gem->use_48b_address_range = false;
>
> memclear(get_tiling);
> get_tiling.handle = bo_gem->gem_handle;
> @@ -1930,6 +1960,13 @@ do_bo_emit_reloc(drm_intel_bo *bo, uint32_t offset,
> return 0;
> }
>
> +static void
> +drm_intel_gem_bo_use_48b_address_range(drm_intel_bo *bo, uint32_t enable)
> +{
> + drm_intel_bo_gem *bo_gem = (drm_intel_bo_gem *) bo;
> + bo_gem->use_48b_address_range = enable;
> +}
> +
> static int
> drm_intel_gem_bo_emit_reloc(drm_intel_bo *bo, uint32_t offset,
> drm_intel_bo *target_bo, uint32_t target_offset,
> @@ -2073,10 +2110,12 @@ drm_intel_update_buffer_offsets(drm_intel_bufmgr_gem *bufmgr_gem)
>
> /* Update the buffer offset */
> if (bufmgr_gem->exec_objects[i].offset != bo->offset64) {
> - DBG("BO %d (%s) migrated: 0x%08lx -> 0x%08llx\n",
> - bo_gem->gem_handle, bo_gem->name, bo->offset64,
> - (unsigned long long)bufmgr_gem->exec_objects[i].
> - offset);
> + DBG("BO %d (%s) migrated: 0x%08x %08x -> 0x%08x %08x\n",
> + bo_gem->gem_handle, bo_gem->name,
> + upper_32_bits(bo->offset64),
> + lower_32_bits(bo->offset64),
> + upper_32_bits(bufmgr_gem->exec_objects[i].offset),
> + lower_32_bits(bufmgr_gem->exec_objects[i].offset));
> bo->offset64 = bufmgr_gem->exec_objects[i].offset;
> bo->offset = bufmgr_gem->exec_objects[i].offset;
> }
> @@ -2094,9 +2133,12 @@ drm_intel_update_buffer_offsets2 (drm_intel_bufmgr_gem *bufmgr_gem)
>
> /* Update the buffer offset */
> if (bufmgr_gem->exec2_objects[i].offset != bo->offset64) {
> - DBG("BO %d (%s) migrated: 0x%08lx -> 0x%08llx\n",
> - bo_gem->gem_handle, bo_gem->name, bo->offset64,
> - (unsigned long long)bufmgr_gem->exec2_objects[i].offset);
> + DBG("BO %d (%s) migrated: 0x%08x %08x -> 0x%08x %08x\n",
> + bo_gem->gem_handle, bo_gem->name,
> + upper_32_bits(bo->offset64),
> + lower_32_bits(bo->offset64),
> + upper_32_bits(bufmgr_gem->exec2_objects[i].offset),
> + lower_32_bits(bufmgr_gem->exec2_objects[i].offset));
> bo->offset64 = bufmgr_gem->exec2_objects[i].offset;
> bo->offset = bufmgr_gem->exec2_objects[i].offset;
> }
> @@ -2481,6 +2523,7 @@ drm_intel_bo_gem_create_from_prime(drm_intel_bufmgr *bufmgr, int prime_fd, int s
> bo_gem->used_as_reloc_target = false;
> bo_gem->has_error = false;
> bo_gem->reusable = false;
> + bo_gem->use_48b_address_range = false;
>
> DRMINITLISTHEAD(&bo_gem->vma_list);
> DRMLISTADDTAIL(&bo_gem->name_list, &bufmgr_gem->named);
> @@ -3278,6 +3321,13 @@ drm_intel_bufmgr_gem_init(int fd, int batch_size)
> }
> }
>
> + if (bufmgr_gem->gen >= 8) {
> + gp.param = I915_PARAM_HAS_ALIASING_PPGTT;
> + ret = drmIoctl(bufmgr_gem->fd, DRM_IOCTL_I915_GETPARAM, &gp);
> + if (ret == 0 && *gp.value == 3)
> + bufmgr_gem->bufmgr.bo_use_48b_address_range = drm_intel_gem_bo_use_48b_address_range;
> + }
> +
> /* Let's go with one relocation per every 2 dwords (but round down a bit
> * since a power of two will mean an extra page allocation for the reloc
> * buffer).
> diff --git a/intel/intel_bufmgr_priv.h b/intel/intel_bufmgr_priv.h
> index 59ebd18..5c17ffb 100644
> --- a/intel/intel_bufmgr_priv.h
> +++ b/intel/intel_bufmgr_priv.h
> @@ -152,6 +152,20 @@ struct _drm_intel_bufmgr {
> void (*destroy) (drm_intel_bufmgr *bufmgr);
>
> /**
> + * Indicate if the buffer can be placed anywhere in the full ppgtt
> + * address range (2^48).
> + *
> + * Any resource used with flat/heapless (0x00000000-0xfffff000)
> + * General State Heap (GSH) or Intructions State Heap (ISH) must
> + * be in a 32-bit range. 48-bit range will only be used when explicitly
> + * requested.
> + *
> + * \param bo Buffer to set the use_48b_address_range flag.
> + * \param enable The flag value.
> + */
> + void (*bo_use_48b_address_range) (drm_intel_bo *bo, uint32_t enable);
> +
> + /**
> * Add relocation entry in reloc_buf, which will be updated with the
> * target buffer's real offset on on command submission.
> *
> --
> 2.5.0
>
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