Refactor DSB implementation to be compatible with Xe driver.
v1: RFC version.
v2: Make intel_dsb structure opaque from external usage. [Jani]
v3: Rebased on latest.
v4:
- Add boundary check in dsb_buffer_memset(). [Luca]
- Use size_t instead of u32. [Luca]
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Animesh Manna <animesh.manna@xxxxxxxxx>
---
drivers/gpu/drm/i915/Makefile | 1 +
drivers/gpu/drm/i915/display/intel_dsb.c | 98 +++++++------------
.../gpu/drm/i915/display/intel_dsb_buffer.c | 83 ++++++++++++++++
.../gpu/drm/i915/display/intel_dsb_buffer.h | 29 ++++++
4 files changed, 149 insertions(+), 62 deletions(-)
create mode 100644 drivers/gpu/drm/i915/display/intel_dsb_buffer.c
create mode 100644 drivers/gpu/drm/i915/display/intel_dsb_buffer.h
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 3b9dcb606fc1..0687b00e1740 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -272,6 +272,7 @@ i915-y += \
display/intel_dpt.o \
display/intel_drrs.o \
display/intel_dsb.o \
+ display/intel_dsb_buffer.o \
display/intel_fb.o \
display/intel_fb_pin.o \
display/intel_fbc.o \
diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c b/drivers/gpu/drm/i915/display/intel_dsb.c
index 78b6fe24dcd8..3c7733a416a4 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.c
+++ b/drivers/gpu/drm/i915/display/intel_dsb.c
@@ -4,9 +4,6 @@
*
*/
-#include "gem/i915_gem_internal.h"
-#include "gem/i915_gem_lmem.h"
-
#include "i915_drv.h"
#include "i915_irq.h"
#include "i915_reg.h"
@@ -14,12 +11,13 @@
#include "intel_de.h"
#include "intel_display_types.h"
#include "intel_dsb.h"
+#include "intel_dsb_buffer.h"
#include "intel_dsb_regs.h"
#include "intel_vblank.h"
#include "intel_vrr.h"
#include "skl_watermark.h"
-struct i915_vma;
+#define CACHELINE_BYTES 64
enum dsb_id {
INVALID_DSB = -1,
@@ -32,8 +30,7 @@ enum dsb_id {
struct intel_dsb {
enum dsb_id id;
- u32 *cmd_buf;
- struct i915_vma *vma;
+ struct intel_dsb_buffer dsb_buf;
struct intel_crtc *crtc;
/*
@@ -109,15 +106,17 @@ static void intel_dsb_dump(struct intel_dsb *dsb)
{
struct intel_crtc *crtc = dsb->crtc;
struct drm_i915_private *i915 = to_i915(crtc->base.dev);
- const u32 *buf = dsb->cmd_buf;
int i;
drm_dbg_kms(&i915->drm, "[CRTC:%d:%s] DSB %d commands {\n",
crtc->base.base.id, crtc->base.name, dsb->id);
for (i = 0; i < ALIGN(dsb->free_pos, 64 / 4); i += 4)
drm_dbg_kms(&i915->drm,
- " 0x%08x: 0x%08x 0x%08x 0x%08x 0x%08x\n",
- i * 4, buf[i], buf[i+1], buf[i+2], buf[i+3]);
+ " 0x%08x: 0x%08x 0x%08x 0x%08x 0x%08x\n", i * 4,
+ intel_dsb_buffer_read(&dsb->dsb_buf, i),
+ intel_dsb_buffer_read(&dsb->dsb_buf, i + 1),
+ intel_dsb_buffer_read(&dsb->dsb_buf, i + 2),
+ intel_dsb_buffer_read(&dsb->dsb_buf, i + 3));
drm_dbg_kms(&i915->drm, "}\n");
}
@@ -129,8 +128,6 @@ static bool is_dsb_busy(struct drm_i915_private *i915, enum pipe pipe,
static void intel_dsb_emit(struct intel_dsb *dsb, u32 ldw, u32 udw)
{
- u32 *buf = dsb->cmd_buf;
-
if (!assert_dsb_has_room(dsb))
return;
@@ -139,14 +136,13 @@ static void intel_dsb_emit(struct intel_dsb *dsb, u32 ldw, u32 udw)
dsb->ins_start_offset = dsb->free_pos;
- buf[dsb->free_pos++] = ldw;
- buf[dsb->free_pos++] = udw;
+ intel_dsb_buffer_write(&dsb->dsb_buf, dsb->free_pos++, ldw);
+ intel_dsb_buffer_write(&dsb->dsb_buf, dsb->free_pos++, udw);
}
static bool intel_dsb_prev_ins_is_write(struct intel_dsb *dsb,
u32 opcode, i915_reg_t reg)
{
- const u32 *buf = dsb->cmd_buf;
u32 prev_opcode, prev_reg;
/*
@@ -157,8 +153,10 @@ static bool intel_dsb_prev_ins_is_write(struct intel_dsb *dsb,
if (dsb->free_pos == 0)
return false;
- prev_opcode = buf[dsb->ins_start_offset + 1] & ~DSB_REG_VALUE_MASK;
- prev_reg = buf[dsb->ins_start_offset + 1] & DSB_REG_VALUE_MASK;
+ prev_opcode = intel_dsb_buffer_read(&dsb->dsb_buf,
+ dsb->ins_start_offset + 1) >> DSB_OPCODE_SHIFT;
+ prev_reg = intel_dsb_buffer_read(&dsb->dsb_buf,
+ dsb->ins_start_offset + 1) & DSB_REG_VALUE_MASK;
return prev_opcode == opcode && prev_reg == i915_mmio_reg_offset(reg);
}
@@ -191,6 +189,8 @@ static bool intel_dsb_prev_ins_is_indexed_write(struct intel_dsb *dsb, i915_reg_
void intel_dsb_reg_write(struct intel_dsb *dsb,
i915_reg_t reg, u32 val)
{
+ u32 old_val;
+
/*
* For example the buffer will look like below for 3 dwords for auto
* increment register:
@@ -214,31 +214,32 @@ void intel_dsb_reg_write(struct intel_dsb *dsb,
(DSB_BYTE_EN << DSB_BYTE_EN_SHIFT) |
i915_mmio_reg_offset(reg));
} else {
- u32 *buf = dsb->cmd_buf;
-
if (!assert_dsb_has_room(dsb))
return;
/* convert to indexed write? */
if (intel_dsb_prev_ins_is_mmio_write(dsb, reg)) {
- u32 prev_val = buf[dsb->ins_start_offset + 0];
+ u32 prev_val = intel_dsb_buffer_read(&dsb->dsb_buf,
+ dsb->ins_start_offset + 0);
- buf[dsb->ins_start_offset + 0] = 1; /* count */
- buf[dsb->ins_start_offset + 1] =
- (DSB_OPCODE_INDEXED_WRITE << DSB_OPCODE_SHIFT) |
- i915_mmio_reg_offset(reg);
- buf[dsb->ins_start_offset + 2] = prev_val;
+ intel_dsb_buffer_write(&dsb->dsb_buf,
+ dsb->ins_start_offset + 0, 1); /* count */
+ intel_dsb_buffer_write(&dsb->dsb_buf, dsb->ins_start_offset + 1,
+ (DSB_OPCODE_INDEXED_WRITE << DSB_OPCODE_SHIFT) |
+ i915_mmio_reg_offset(reg));
+ intel_dsb_buffer_write(&dsb->dsb_buf, dsb->ins_start_offset + 2, prev_val);
dsb->free_pos++;
}
- buf[dsb->free_pos++] = val;
+ intel_dsb_buffer_write(&dsb->dsb_buf, dsb->free_pos++, val);
/* Update the count */
- buf[dsb->ins_start_offset]++;
+ old_val = intel_dsb_buffer_read(&dsb->dsb_buf, dsb->ins_start_offset);
+ intel_dsb_buffer_write(&dsb->dsb_buf, dsb->ins_start_offset, old_val + 1);
/* if number of data words is odd, then the last dword should be 0.*/
if (dsb->free_pos & 0x1)
- buf[dsb->free_pos] = 0;
+ intel_dsb_buffer_write(&dsb->dsb_buf, dsb->free_pos, 0);
}
}
@@ -297,8 +298,8 @@ static void intel_dsb_align_tail(struct intel_dsb *dsb)
aligned_tail = ALIGN(tail, CACHELINE_BYTES);
if (aligned_tail > tail)
- memset(&dsb->cmd_buf[dsb->free_pos], 0,
- aligned_tail - tail);
+ intel_dsb_buffer_memset(&dsb->dsb_buf, dsb->free_pos, 0,
+ aligned_tail - tail);
dsb->free_pos = aligned_tail / 4;
}
@@ -317,7 +318,7 @@ void intel_dsb_finish(struct intel_dsb *dsb)
intel_dsb_align_tail(dsb);
- i915_gem_object_flush_map(dsb->vma->obj);
+ intel_dsb_buffer_flush_map(&dsb->dsb_buf);
}
static int intel_dsb_dewake_scanline(const struct intel_crtc_state *crtc_state)
@@ -361,7 +362,7 @@ static void _intel_dsb_commit(struct intel_dsb *dsb, u32 ctrl,
ctrl | DSB_ENABLE);
intel_de_write_fw(dev_priv, DSB_HEAD(pipe, dsb->id),
- i915_ggtt_offset(dsb->vma));
+ intel_dsb_buffer_ggtt_offset(&dsb->dsb_buf));
if (dewake_scanline >= 0) {
int diff, hw_dewake_scanline;
@@ -383,7 +384,7 @@ static void _intel_dsb_commit(struct intel_dsb *dsb, u32 ctrl,
}
intel_de_write_fw(dev_priv, DSB_TAIL(pipe, dsb->id),
- i915_ggtt_offset(dsb->vma) + tail);
+ intel_dsb_buffer_ggtt_offset(&dsb->dsb_buf) + tail);
}
/**
@@ -408,7 +409,7 @@ void intel_dsb_wait(struct intel_dsb *dsb)
enum pipe pipe = crtc->pipe;
if (wait_for(!is_dsb_busy(dev_priv, pipe, dsb->id), 1)) {
- u32 offset = i915_ggtt_offset(dsb->vma);
+ u32 offset = intel_dsb_buffer_ggtt_offset(&dsb->dsb_buf);
intel_de_write_fw(dev_priv, DSB_CTRL(pipe, dsb->id),
DSB_ENABLE | DSB_HALT);
@@ -445,12 +446,9 @@ struct intel_dsb *intel_dsb_prepare(const struct intel_crtc_state *crtc_state,
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
struct drm_i915_private *i915 = to_i915(crtc->base.dev);
- struct drm_i915_gem_object *obj;
intel_wakeref_t wakeref;
struct intel_dsb *dsb;
- struct i915_vma *vma;
unsigned int size;
- u32 *buf;
if (!HAS_DSB(i915))
return NULL;
@@ -464,37 +462,13 @@ struct intel_dsb *intel_dsb_prepare(const struct intel_crtc_state *crtc_state,
/* ~1 qword per instruction, full cachelines */
size = ALIGN(max_cmds * 8, CACHELINE_BYTES);
- if (HAS_LMEM(i915)) {
- obj = i915_gem_object_create_lmem(i915, PAGE_ALIGN(size),
- I915_BO_ALLOC_CONTIGUOUS);
- if (IS_ERR(obj))
- goto out_put_rpm;
- } else {
- obj = i915_gem_object_create_internal(i915, PAGE_ALIGN(size));
- if (IS_ERR(obj))
- goto out_put_rpm;
-
- i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
- }
-
- vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
- if (IS_ERR(vma)) {
- i915_gem_object_put(obj);
- goto out_put_rpm;
- }
-
- buf = i915_gem_object_pin_map_unlocked(vma->obj, I915_MAP_WC);
- if (IS_ERR(buf)) {
- i915_vma_unpin_and_release(&vma, I915_VMA_RELEASE_MAP);
+ if (!intel_dsb_buffer_create(crtc, &dsb->dsb_buf, size))
goto out_put_rpm;
- }
intel_runtime_pm_put(&i915->runtime_pm, wakeref);
dsb->id = DSB1;
- dsb->vma = vma;
dsb->crtc = crtc;
- dsb->cmd_buf = buf;
dsb->size = size / 4; /* in dwords */
dsb->free_pos = 0;
dsb->ins_start_offset = 0;
@@ -522,6 +496,6 @@ struct intel_dsb *intel_dsb_prepare(const struct intel_crtc_state *crtc_state,
*/
void intel_dsb_cleanup(struct intel_dsb *dsb)
{
- i915_vma_unpin_and_release(&dsb->vma, I915_VMA_RELEASE_MAP);
+ intel_dsb_buffer_cleanup(&dsb->dsb_buf);
kfree(dsb);
}
diff --git a/drivers/gpu/drm/i915/display/intel_dsb_buffer.c b/drivers/gpu/drm/i915/display/intel_dsb_buffer.c
new file mode 100644
index 000000000000..ea835512fb08
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_dsb_buffer.c
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright 2023, Intel Corporation.
+ */
+
+#include "gem/i915_gem_internal.h"
+#include "gem/i915_gem_lmem.h"
+#include "i915_drv.h"
+#include "i915_vma.h"
+#include "intel_display_types.h"
+#include "intel_dsb_buffer.h"
+
+u32 intel_dsb_buffer_ggtt_offset(struct intel_dsb_buffer *dsb_buf)
+{
+ return i915_ggtt_offset(dsb_buf->vma);
+}
+
+void intel_dsb_buffer_write(struct intel_dsb_buffer *dsb_buf, u32 idx, u32 val)
+{
+ dsb_buf->cmd_buf[idx] = val;
+}
+
+u32 intel_dsb_buffer_read(struct intel_dsb_buffer *dsb_buf, u32 idx)
+{
+ return dsb_buf->cmd_buf[idx];
+}
+
+void intel_dsb_buffer_memset(struct intel_dsb_buffer *dsb_buf, u32 idx, u32 val, size_t size)
+{
+ if ((idx > dsb_buf->buf_size / 4) || (size > dsb_buf->buf_size - idx * 4))
+ return;
+
+ memset(&dsb_buf->cmd_buf[idx], val, size);
+}
+
+bool intel_dsb_buffer_create(struct intel_crtc *crtc, struct intel_dsb_buffer *dsb_buf, size_t size)
+{
+ struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+ struct drm_i915_gem_object *obj;
+ struct i915_vma *vma;
+ u32 *buf;
+
+ if (HAS_LMEM(i915)) {
+ obj = i915_gem_object_create_lmem(i915, PAGE_ALIGN(size),
+ I915_BO_ALLOC_CONTIGUOUS);
+ if (IS_ERR(obj))
+ return false;
+ } else {
+ obj = i915_gem_object_create_internal(i915, PAGE_ALIGN(size));
+ if (IS_ERR(obj))
+ return false;
+
+ i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
+ }
+
+ vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
+ if (IS_ERR(vma)) {
+ i915_gem_object_put(obj);
+ return false;
+ }
+
+ buf = i915_gem_object_pin_map_unlocked(vma->obj, I915_MAP_WC);
+ if (IS_ERR(buf)) {
+ i915_vma_unpin_and_release(&vma, I915_VMA_RELEASE_MAP);
+ return false;
+ }
+
+ dsb_buf->vma = vma;
+ dsb_buf->cmd_buf = buf;
+ dsb_buf->buf_size = size;
+
+ return true;
+}
+
+void intel_dsb_buffer_cleanup(struct intel_dsb_buffer *dsb_buf)
+{
+ i915_vma_unpin_and_release(&dsb_buf->vma, I915_VMA_RELEASE_MAP);
+}
+
+void intel_dsb_buffer_flush_map(struct intel_dsb_buffer *dsb_buf)
+{
+ i915_gem_object_flush_map(dsb_buf->vma->obj);
+}
diff --git a/drivers/gpu/drm/i915/display/intel_dsb_buffer.h b/drivers/gpu/drm/i915/display/intel_dsb_buffer.h
new file mode 100644
index 000000000000..425acd393905
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_dsb_buffer.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2023 Intel Corporation
+ */
+
+#ifndef _INTEL_DSB_BUFFER_H
+#define _INTEL_DSB_BUFFER_H
+
+#include <linux/types.h>
+
+struct intel_crtc;
+struct i915_vma;
+
+struct intel_dsb_buffer {
+ u32 *cmd_buf;
+ struct i915_vma *vma;
+ size_t buf_size;
+};
+
+u32 intel_dsb_buffer_ggtt_offset(struct intel_dsb_buffer *dsb_buf);
+void intel_dsb_buffer_write(struct intel_dsb_buffer *dsb_buf, u32 idx, u32 val);
+u32 intel_dsb_buffer_read(struct intel_dsb_buffer *dsb_buf, u32 idx);
+void intel_dsb_buffer_memset(struct intel_dsb_buffer *dsb_buf, u32 idx, u32 val, size_t size);
+bool intel_dsb_buffer_create(struct intel_crtc *crtc, struct intel_dsb_buffer *dsb_buf,
+ size_t size);
+void intel_dsb_buffer_cleanup(struct intel_dsb_buffer *dsb_buf);
+void intel_dsb_buffer_flush_map(struct intel_dsb_buffer *dsb_buf);
+
+#endif
--
2.29.0
