[RFC,v2,2/2] drm/i915/gen7: Clear all EU/L3 residual contexts
diff mbox series

Message ID 20200114174549.74643-3-akeem.g.abodunrin@intel.com
State New
Headers show
Series
  • Security mitigation for Intel Gen7 HWs
Related show

Commit Message

Akeem G Abodunrin Jan. 14, 2020, 5:45 p.m. UTC
From: Prathap Kumar Valsan <prathap.kumar.valsan@intel.com>

On gen7 and gen7.5 devices, there could be leftover data residuals in
EU/L3 from the retiring context. This patch introduces workaround to clear
that residual contexts, by submitting a batch buffer with dedicated HW
context to the GPU with ring allocation for each context switching.

V2: Addressed comments about unused code, code formatting, and include
additional debug code

Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Prathap Kumar Valsan <prathap.kumar.valsan@intel.com>
Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>
Cc: Chris Wilson <chris.p.wilson@intel.com>
Cc: Balestrieri Francesco <francesco.balestrieri@intel.com>
Cc: Bloomfield Jon <jon.bloomfield@intel.com>
Cc: Dutt Sudeep <sudeep.dutt@intel.com>
---
 drivers/gpu/drm/i915/Makefile                 |   1 +
 drivers/gpu/drm/i915/gt/gen7_renderclear.c    | 515 ++++++++++++++++++
 drivers/gpu/drm/i915/gt/gen7_renderclear.h    |  16 +
 drivers/gpu/drm/i915/gt/intel_gpu_commands.h  |  17 +-
 .../gpu/drm/i915/gt/intel_ring_submission.c   |   3 +-
 drivers/gpu/drm/i915/i915_utils.h             |   5 +
 6 files changed, 553 insertions(+), 4 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/gt/gen7_renderclear.c
 create mode 100644 drivers/gpu/drm/i915/gt/gen7_renderclear.h

Comments

Ville Syrjälä Jan. 16, 2020, 4:55 p.m. UTC | #1
On Tue, Jan 14, 2020 at 09:45:48AM -0800, Akeem G Abodunrin wrote:
> From: Prathap Kumar Valsan <prathap.kumar.valsan@intel.com>
> 
> On gen7 and gen7.5 devices, there could be leftover data residuals in
> EU/L3 from the retiring context. This patch introduces workaround to clear
> that residual contexts, by submitting a batch buffer with dedicated HW
> context to the GPU with ring allocation for each context switching.
> 
> V2: Addressed comments about unused code, code formatting, and include
> additional debug code
> 
> Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
> Signed-off-by: Prathap Kumar Valsan <prathap.kumar.valsan@intel.com>
> Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>
> Cc: Chris Wilson <chris.p.wilson@intel.com>
> Cc: Balestrieri Francesco <francesco.balestrieri@intel.com>
> Cc: Bloomfield Jon <jon.bloomfield@intel.com>
> Cc: Dutt Sudeep <sudeep.dutt@intel.com>
> ---
>  drivers/gpu/drm/i915/Makefile                 |   1 +
>  drivers/gpu/drm/i915/gt/gen7_renderclear.c    | 515 ++++++++++++++++++
>  drivers/gpu/drm/i915/gt/gen7_renderclear.h    |  16 +
>  drivers/gpu/drm/i915/gt/intel_gpu_commands.h  |  17 +-
>  .../gpu/drm/i915/gt/intel_ring_submission.c   |   3 +-
>  drivers/gpu/drm/i915/i915_utils.h             |   5 +
>  6 files changed, 553 insertions(+), 4 deletions(-)
>  create mode 100644 drivers/gpu/drm/i915/gt/gen7_renderclear.c
>  create mode 100644 drivers/gpu/drm/i915/gt/gen7_renderclear.h
> 
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index b8c5f8934dbd..e5386871f015 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -75,6 +75,7 @@ gt-y += \
>  	gt/debugfs_gt.o \
>  	gt/debugfs_gt_pm.o \
>  	gt/gen6_ppgtt.o \
> +	gt/gen7_renderclear.o \
>  	gt/gen8_ppgtt.o \
>  	gt/intel_breadcrumbs.o \
>  	gt/intel_context.o \
> diff --git a/drivers/gpu/drm/i915/gt/gen7_renderclear.c b/drivers/gpu/drm/i915/gt/gen7_renderclear.c
> new file mode 100644
> index 000000000000..6fe2a6fcbddd
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/gt/gen7_renderclear.c
> @@ -0,0 +1,515 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright © 2019 Intel Corporation
> + */
> +
> +#include "gen7_renderclear.h"
> +#include "i915_drv.h"
> +#include "i915_utils.h"
> +#include "intel_gpu_commands.h"
> +
> +#define MAX_URB_ENTRIES 64
> +#define STATE_SIZE (4 * 1024)
> +#define GT3_INLINE_DATA_DELAYS 0x1E00
> +
> +/* Media CB Kernel for gen7 devices */
> +static const u32 cb7_kernel[][4] = {
> +	{ 0x00000001, 0x26020128, 0x00000024, 0x00000000 },
> +	{ 0x00000040, 0x20280c21, 0x00000028, 0x00000001 },
> +	{ 0x01000010, 0x20000c20, 0x0000002c, 0x00000000 },
> +	{ 0x00010220, 0x34001c00, 0x00001400, 0x0000002c },
> +	{ 0x00600001, 0x20600061, 0x00000000, 0x00000000 },
> +	{ 0x00000008, 0x20601c85, 0x00000e00, 0x0000000c },
> +	{ 0x00000005, 0x20601ca5, 0x00000060, 0x00000001 },
> +	{ 0x00000008, 0x20641c85, 0x00000e00, 0x0000000d },
> +	{ 0x00000005, 0x20641ca5, 0x00000064, 0x00000003 },
> +	{ 0x00000041, 0x207424a5, 0x00000064, 0x00000034 },
> +	{ 0x00000040, 0x206014a5, 0x00000060, 0x00000074 },
> +	{ 0x00000008, 0x20681c85, 0x00000e00, 0x00000008 },
> +	{ 0x00000005, 0x20681ca5, 0x00000068, 0x0000000f },
> +	{ 0x00000041, 0x20701ca5, 0x00000060, 0x00000010 },
> +	{ 0x00000040, 0x206814a5, 0x00000068, 0x00000070 },
> +	{ 0x00600001, 0x20a00061, 0x00000000, 0x00000000 },
> +	{ 0x00000005, 0x206c1c85, 0x00000e00, 0x00000007 },
> +	{ 0x00000041, 0x206c1ca5, 0x0000006c, 0x00000004 },
> +	{ 0x00600001, 0x20800021, 0x008d0000, 0x00000000 },
> +	{ 0x00000001, 0x20800021, 0x0000006c, 0x00000000 },
> +	{ 0x00000001, 0x20840021, 0x00000068, 0x00000000 },
> +	{ 0x00000001, 0x20880061, 0x00000000, 0x00000003 },
> +	{ 0x00000005, 0x208c0d21, 0x00000086, 0xffffffff },
> +	{ 0x05600032, 0x20a01fa1, 0x008d0080, 0x02190001 },
> +	{ 0x00000040, 0x20a01ca5, 0x000000a0, 0x00000001 },
> +	{ 0x05600032, 0x20a01fa1, 0x008d0080, 0x040a8001 },
> +	{ 0x02000040, 0x20281c21, 0x00000028, 0xffffffff },
> +	{ 0x00010220, 0x34001c00, 0x00001400, 0xfffffffc },
> +	{ 0x00000001, 0x26020128, 0x00000024, 0x00000000 },
> +	{ 0x00000001, 0x220000e4, 0x00000000, 0x00000000 },
> +	{ 0x00000001, 0x220801ec, 0x00000000, 0x007f007f },
> +	{ 0x00600001, 0x20400021, 0x008d0000, 0x00000000 },
> +	{ 0x00600001, 0x2fe00021, 0x008d0000, 0x00000000 },
> +	{ 0x00200001, 0x20400121, 0x00450020, 0x00000000 },
> +	{ 0x00000001, 0x20480061, 0x00000000, 0x000f000f },
> +	{ 0x00000005, 0x204c0d21, 0x00000046, 0xffffffef },
> +	{ 0x00800001, 0x20600061, 0x00000000, 0x00000000 },
> +	{ 0x00800001, 0x20800061, 0x00000000, 0x00000000 },
> +	{ 0x00800001, 0x20a00061, 0x00000000, 0x00000000 },
> +	{ 0x00800001, 0x20c00061, 0x00000000, 0x00000000 },
> +	{ 0x00800001, 0x20e00061, 0x00000000, 0x00000000 },
> +	{ 0x00800001, 0x21000061, 0x00000000, 0x00000000 },
> +	{ 0x00800001, 0x21200061, 0x00000000, 0x00000000 },
> +	{ 0x00800001, 0x21400061, 0x00000000, 0x00000000 },
> +	{ 0x05600032, 0x20001fa0, 0x008d0040, 0x120a8000 },
> +	{ 0x00000040, 0x20402d21, 0x00000020, 0x00100010 },
> +	{ 0x05600032, 0x20001fa0, 0x008d0040, 0x120a8000 },
> +	{ 0x02000040, 0x22083d8c, 0x00000208, 0xffffffff },
> +	{ 0x00800001, 0xa0000109, 0x00000602, 0x00000000 },
> +	{ 0x00000040, 0x22001c84, 0x00000200, 0x00000020 },
> +	{ 0x00010220, 0x34001c00, 0x00001400, 0xfffffff8 },
> +	{ 0x07600032, 0x20001fa0, 0x008d0fe0, 0x82000010 },
> +	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
> +	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
> +	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
> +	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
> +	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
> +	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
> +	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
> +	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
> +};

Where's the asm/whatever source for these kernels?
Chris Wilson Jan. 16, 2020, 6:58 p.m. UTC | #2
Quoting Akeem G Abodunrin (2020-01-14 17:45:48)
> diff --git a/drivers/gpu/drm/i915/gt/gen7_renderclear.h b/drivers/gpu/drm/i915/gt/gen7_renderclear.h
> new file mode 100644
> index 000000000000..4b88dd8d0fd4
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/gt/gen7_renderclear.h
> @@ -0,0 +1,16 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * Copyright © 2019 Intel Corporation
> + */
> +
> +#ifndef __GEN7_RENDERCLEAR_H__
> +#define __GEN7_RENDERCLEAR_H__
> +
> +#define batch_advance(Y, CS) GEM_BUG_ON((Y)->end != (CS))

It works better if you actually put it to use, after every
batch_alloc_items() [give or take]. And it doesn't need to be used
outside of gen7_renderclear.c so can live there.
-Chris

Patch
diff mbox series

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index b8c5f8934dbd..e5386871f015 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -75,6 +75,7 @@  gt-y += \
 	gt/debugfs_gt.o \
 	gt/debugfs_gt_pm.o \
 	gt/gen6_ppgtt.o \
+	gt/gen7_renderclear.o \
 	gt/gen8_ppgtt.o \
 	gt/intel_breadcrumbs.o \
 	gt/intel_context.o \
diff --git a/drivers/gpu/drm/i915/gt/gen7_renderclear.c b/drivers/gpu/drm/i915/gt/gen7_renderclear.c
new file mode 100644
index 000000000000..6fe2a6fcbddd
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/gen7_renderclear.c
@@ -0,0 +1,515 @@ 
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#include "gen7_renderclear.h"
+#include "i915_drv.h"
+#include "i915_utils.h"
+#include "intel_gpu_commands.h"
+
+#define MAX_URB_ENTRIES 64
+#define STATE_SIZE (4 * 1024)
+#define GT3_INLINE_DATA_DELAYS 0x1E00
+
+/* Media CB Kernel for gen7 devices */
+static const u32 cb7_kernel[][4] = {
+	{ 0x00000001, 0x26020128, 0x00000024, 0x00000000 },
+	{ 0x00000040, 0x20280c21, 0x00000028, 0x00000001 },
+	{ 0x01000010, 0x20000c20, 0x0000002c, 0x00000000 },
+	{ 0x00010220, 0x34001c00, 0x00001400, 0x0000002c },
+	{ 0x00600001, 0x20600061, 0x00000000, 0x00000000 },
+	{ 0x00000008, 0x20601c85, 0x00000e00, 0x0000000c },
+	{ 0x00000005, 0x20601ca5, 0x00000060, 0x00000001 },
+	{ 0x00000008, 0x20641c85, 0x00000e00, 0x0000000d },
+	{ 0x00000005, 0x20641ca5, 0x00000064, 0x00000003 },
+	{ 0x00000041, 0x207424a5, 0x00000064, 0x00000034 },
+	{ 0x00000040, 0x206014a5, 0x00000060, 0x00000074 },
+	{ 0x00000008, 0x20681c85, 0x00000e00, 0x00000008 },
+	{ 0x00000005, 0x20681ca5, 0x00000068, 0x0000000f },
+	{ 0x00000041, 0x20701ca5, 0x00000060, 0x00000010 },
+	{ 0x00000040, 0x206814a5, 0x00000068, 0x00000070 },
+	{ 0x00600001, 0x20a00061, 0x00000000, 0x00000000 },
+	{ 0x00000005, 0x206c1c85, 0x00000e00, 0x00000007 },
+	{ 0x00000041, 0x206c1ca5, 0x0000006c, 0x00000004 },
+	{ 0x00600001, 0x20800021, 0x008d0000, 0x00000000 },
+	{ 0x00000001, 0x20800021, 0x0000006c, 0x00000000 },
+	{ 0x00000001, 0x20840021, 0x00000068, 0x00000000 },
+	{ 0x00000001, 0x20880061, 0x00000000, 0x00000003 },
+	{ 0x00000005, 0x208c0d21, 0x00000086, 0xffffffff },
+	{ 0x05600032, 0x20a01fa1, 0x008d0080, 0x02190001 },
+	{ 0x00000040, 0x20a01ca5, 0x000000a0, 0x00000001 },
+	{ 0x05600032, 0x20a01fa1, 0x008d0080, 0x040a8001 },
+	{ 0x02000040, 0x20281c21, 0x00000028, 0xffffffff },
+	{ 0x00010220, 0x34001c00, 0x00001400, 0xfffffffc },
+	{ 0x00000001, 0x26020128, 0x00000024, 0x00000000 },
+	{ 0x00000001, 0x220000e4, 0x00000000, 0x00000000 },
+	{ 0x00000001, 0x220801ec, 0x00000000, 0x007f007f },
+	{ 0x00600001, 0x20400021, 0x008d0000, 0x00000000 },
+	{ 0x00600001, 0x2fe00021, 0x008d0000, 0x00000000 },
+	{ 0x00200001, 0x20400121, 0x00450020, 0x00000000 },
+	{ 0x00000001, 0x20480061, 0x00000000, 0x000f000f },
+	{ 0x00000005, 0x204c0d21, 0x00000046, 0xffffffef },
+	{ 0x00800001, 0x20600061, 0x00000000, 0x00000000 },
+	{ 0x00800001, 0x20800061, 0x00000000, 0x00000000 },
+	{ 0x00800001, 0x20a00061, 0x00000000, 0x00000000 },
+	{ 0x00800001, 0x20c00061, 0x00000000, 0x00000000 },
+	{ 0x00800001, 0x20e00061, 0x00000000, 0x00000000 },
+	{ 0x00800001, 0x21000061, 0x00000000, 0x00000000 },
+	{ 0x00800001, 0x21200061, 0x00000000, 0x00000000 },
+	{ 0x00800001, 0x21400061, 0x00000000, 0x00000000 },
+	{ 0x05600032, 0x20001fa0, 0x008d0040, 0x120a8000 },
+	{ 0x00000040, 0x20402d21, 0x00000020, 0x00100010 },
+	{ 0x05600032, 0x20001fa0, 0x008d0040, 0x120a8000 },
+	{ 0x02000040, 0x22083d8c, 0x00000208, 0xffffffff },
+	{ 0x00800001, 0xa0000109, 0x00000602, 0x00000000 },
+	{ 0x00000040, 0x22001c84, 0x00000200, 0x00000020 },
+	{ 0x00010220, 0x34001c00, 0x00001400, 0xfffffff8 },
+	{ 0x07600032, 0x20001fa0, 0x008d0fe0, 0x82000010 },
+	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+};
+
+/* Media CB Kernel for gen7.5 devices */
+static const u32 cb75_kernel[][4] = {
+	{ 0x00000001, 0x26020128, 0x00000024, 0x00000000 },
+	{ 0x00000040, 0x20280c21, 0x00000028, 0x00000001 },
+	{ 0x01000010, 0x20000c20, 0x0000002c, 0x00000000 },
+	{ 0x00010220, 0x34001c00, 0x00001400, 0x00000160 },
+	{ 0x00600001, 0x20600061, 0x00000000, 0x00000000 },
+	{ 0x00000008, 0x20601c85, 0x00000e00, 0x0000000c },
+	{ 0x00000005, 0x20601ca5, 0x00000060, 0x00000001 },
+	{ 0x00000008, 0x20641c85, 0x00000e00, 0x0000000d },
+	{ 0x00000005, 0x20641ca5, 0x00000064, 0x00000003 },
+	{ 0x00000041, 0x207424a5, 0x00000064, 0x00000034 },
+	{ 0x00000040, 0x206014a5, 0x00000060, 0x00000074 },
+	{ 0x00000008, 0x20681c85, 0x00000e00, 0x00000008 },
+	{ 0x00000005, 0x20681ca5, 0x00000068, 0x0000000f },
+	{ 0x00000041, 0x20701ca5, 0x00000060, 0x00000010 },
+	{ 0x00000040, 0x206814a5, 0x00000068, 0x00000070 },
+	{ 0x00600001, 0x20a00061, 0x00000000, 0x00000000 },
+	{ 0x00000005, 0x206c1c85, 0x00000e00, 0x00000007 },
+	{ 0x00000041, 0x206c1ca5, 0x0000006c, 0x00000004 },
+	{ 0x00600001, 0x20800021, 0x008d0000, 0x00000000 },
+	{ 0x00000001, 0x20800021, 0x0000006c, 0x00000000 },
+	{ 0x00000001, 0x20840021, 0x00000068, 0x00000000 },
+	{ 0x00000001, 0x20880061, 0x00000000, 0x00000003 },
+	{ 0x00000005, 0x208c0d21, 0x00000086, 0xffffffff },
+	{ 0x05600032, 0x20a01fa1, 0x008d0080, 0x02190001 },
+	{ 0x00000040, 0x20a01ca5, 0x000000a0, 0x00000001 },
+	{ 0x05600032, 0x20a01fa1, 0x008d0080, 0x040a8001 },
+	{ 0x02000040, 0x20281c21, 0x00000028, 0xffffffff },
+	{ 0x00010220, 0x34001c00, 0x00001400, 0xffffffe0 },
+	{ 0x00000001, 0x26020128, 0x00000024, 0x00000000 },
+	{ 0x00000001, 0x220000e4, 0x00000000, 0x00000000 },
+	{ 0x00000001, 0x220801ec, 0x00000000, 0x007f007f },
+	{ 0x00600001, 0x20400021, 0x008d0000, 0x00000000 },
+	{ 0x00600001, 0x2fe00021, 0x008d0000, 0x00000000 },
+	{ 0x00200001, 0x20400121, 0x00450020, 0x00000000 },
+	{ 0x00000001, 0x20480061, 0x00000000, 0x000f000f },
+	{ 0x00000005, 0x204c0d21, 0x00000046, 0xffffffef },
+	{ 0x00800001, 0x20600061, 0x00000000, 0x00000000 },
+	{ 0x00800001, 0x20800061, 0x00000000, 0x00000000 },
+	{ 0x00800001, 0x20a00061, 0x00000000, 0x00000000 },
+	{ 0x00800001, 0x20c00061, 0x00000000, 0x00000000 },
+	{ 0x00800001, 0x20e00061, 0x00000000, 0x00000000 },
+	{ 0x00800001, 0x21000061, 0x00000000, 0x00000000 },
+	{ 0x00800001, 0x21200061, 0x00000000, 0x00000000 },
+	{ 0x00800001, 0x21400061, 0x00000000, 0x00000000 },
+	{ 0x05600032, 0x20001fa0, 0x008d0040, 0x120a8000 },
+	{ 0x00000040, 0x20402d21, 0x00000020, 0x00100010 },
+	{ 0x05600032, 0x20001fa0, 0x008d0040, 0x120a8000 },
+	{ 0x02000040, 0x22083d8c, 0x00000208, 0xffffffff },
+	{ 0x00800001, 0xa0000109, 0x00000602, 0x00000000 },
+	{ 0x00000040, 0x22001c84, 0x00000200, 0x00000020 },
+	{ 0x00010220, 0x34001c00, 0x00001400, 0xffffffc0 },
+	{ 0x07600032, 0x20001fa0, 0x008d0fe0, 0x82000010 },
+	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+	{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
+};
+
+struct cb_kernel {
+	const void *data;
+	u32 size;
+};
+
+#define CB_KERNEL(name) { .data = (name), .size = sizeof(name) }
+
+static const struct cb_kernel cb_kernel_gen7 = CB_KERNEL(cb7_kernel);
+static const struct cb_kernel cb_kernel_hsw = CB_KERNEL(cb75_kernel);
+
+struct batch_chunk {
+	struct i915_vma *vma;
+	u32 offset;
+	u32 *start;
+	u32 *end;
+	u32 max_items;
+};
+
+struct batch_vals {
+	u32 max_primitives;
+	u32 max_urb_entries;
+	u32 cmd_size;
+	u32 state_size;
+	u32 state_start;
+	u32 batch_size;
+	u32 surface_height;
+	u32 surface_width;
+	u32 scratch_size;
+	u32 max_size;
+};
+
+static void
+batch_get_defaults(struct drm_i915_private *i915, struct batch_vals *bv)
+{
+	if (IS_HASWELL(i915)) {
+		bv->max_primitives = 280;
+		bv->max_urb_entries = MAX_URB_ENTRIES;
+		bv->surface_height = 16 * 16;
+		bv->surface_width = 32 * 2 * 16;
+	} else {
+		bv->max_primitives = 128;
+		bv->max_urb_entries = MAX_URB_ENTRIES / 2;
+		bv->surface_height = 16 * 8;
+		bv->surface_width = 32 * 16;
+	}
+	bv->cmd_size = bv->max_primitives * 4096;
+	bv->state_size = STATE_SIZE;
+	bv->state_start = bv->cmd_size;
+	bv->batch_size = bv->cmd_size + bv->state_size;
+	bv->scratch_size = bv->surface_height * bv->surface_width;
+	bv->max_size = bv->batch_size + bv->scratch_size;
+}
+
+static void batch_init(struct batch_chunk *bc,
+		       struct i915_vma *vma,
+		       u32 *start, u32 offset, u32 max_bytes)
+{
+	bc->vma = vma;
+	bc->offset = offset;
+	bc->start = start + bc->offset / sizeof(*bc->start);
+	bc->end = bc->start;
+	bc->max_items = max_bytes / sizeof(*bc->start);
+}
+
+static u32 batch_offset(const struct batch_chunk *bc, u32 *cs)
+{
+	return (cs - bc->start) * sizeof(*bc->start) + bc->offset;
+}
+
+static u32 batch_addr(const struct batch_chunk *bc)
+{
+	return bc->vma->node.start;
+}
+
+static void batch_add(struct batch_chunk *bc, const u32 d)
+{
+	GEM_DEBUG_WARN_ON((bc->end - bc->start) >= bc->max_items);
+	*bc->end++ = d;
+}
+
+static u32 *batch_alloc_items(struct batch_chunk *bc, u32 align, u32 items)
+{
+	u32 *map;
+
+	if (align) {
+		u32 *end = ptr_align(bc->end, align);
+
+		memset32(bc->end, 0, end - bc->end);
+		bc->end = end;
+	}
+
+	map = bc->end;
+	bc->end += items;
+
+	return map;
+}
+
+static u32 *batch_alloc_bytes(struct batch_chunk *bc, u32 align, u32 bytes)
+{
+	GEM_BUG_ON(!IS_ALIGNED(bytes, sizeof(*bc->start)));
+	return batch_alloc_items(bc, align, bytes / sizeof(*bc->start));
+}
+
+static u32
+gen7_fill_surface_state(struct batch_chunk *state,
+			const u32 dst_offset,
+			const struct batch_vals *bv)
+{
+	u32 surface_h = bv->surface_height;
+	u32 surface_w = bv->surface_width;
+	u32 *cs = batch_alloc_items(state, 32, 8);
+	u32 offset = batch_offset(state, cs);
+
+#define SURFACE_2D 1
+#define SURFACEFORMAT_B8G8R8A8_UNORM 0x0C0
+#define RENDER_CACHE_READ_WRITE 1
+
+	*cs++ = SURFACE_2D << 29 |
+		(SURFACEFORMAT_B8G8R8A8_UNORM << 18) |
+		(RENDER_CACHE_READ_WRITE << 8);
+
+	*cs++ = batch_addr(state) + dst_offset;
+
+	*cs++ = ((surface_h / 4 - 1) << 16) | (surface_w / 4 - 1);
+	*cs++ = surface_w;
+	*cs++ = 0;
+	*cs++ = 0;
+	*cs++ = 0;
+#define SHADER_CHANNELS(r, g, b, a) \
+	(((r) << 25) | ((g) << 22) | ((b) << 19) | ((a) << 16))
+	*cs++ = SHADER_CHANNELS(4, 5, 6, 7);
+	batch_advance(state, cs);
+
+	return offset;
+}
+
+static u32
+gen7_fill_binding_table(struct batch_chunk *state,
+			const struct batch_vals *bv)
+{
+	u32 *cs = batch_alloc_items(state, 32, 8);
+	u32 offset = batch_offset(state, cs);
+	u32 surface_start;
+
+	surface_start = gen7_fill_surface_state(state, bv->batch_size, bv);
+	*cs++ = surface_start - state->offset;
+	*cs++ = 0;
+	*cs++ = 0;
+	*cs++ = 0;
+	*cs++ = 0;
+	*cs++ = 0;
+	*cs++ = 0;
+	*cs++ = 0;
+
+	return offset;
+}
+
+static u32
+gen7_fill_kernel_data(struct batch_chunk *state,
+		      const u32 *data,
+		      const u32 size)
+{
+	return batch_offset(state,
+			    memcpy(batch_alloc_bytes(state, 64, size),
+				   data, size));
+}
+
+static u32
+gen7_fill_interface_descriptor(struct batch_chunk *state,
+			       const struct batch_vals *bv,
+			       const struct cb_kernel *kernel,
+			       unsigned int count)
+{
+	u32 *cs = batch_alloc_items(state, 32, 8 * count);
+	u32 offset = batch_offset(state, cs);
+
+	*cs++ = gen7_fill_kernel_data(state, kernel->data, kernel->size);
+	*cs++ = (1 << 7) | (1 << 13);
+	*cs++ = 0;
+	*cs++ = (gen7_fill_binding_table(state, bv) - state->offset) | 1;
+	*cs++ = 0;
+	*cs++ = 0;
+	*cs++ = 0;
+	*cs++ = 0;
+	/* 1 - 63dummy idds */
+	memset32(cs, 0x00, (count - 1) * 8);
+
+	return offset;
+}
+
+static void
+gen7_emit_state_base_address(struct batch_chunk *batch,
+			     u32 surface_state_base)
+{
+	u32 *cs = batch_alloc_items(batch, 0, 12);
+
+	*cs++ = STATE_BASE_ADDRESS | (12 - 2);
+	/* general */
+	*cs++ = batch_addr(batch) | BASE_ADDRESS_MODIFY;
+	/* surface */
+	*cs++ = batch_addr(batch) | surface_state_base | BASE_ADDRESS_MODIFY;
+	/* dynamic */
+	*cs++ = batch_addr(batch) | BASE_ADDRESS_MODIFY;
+	/* indirect */
+	*cs++ = batch_addr(batch) | BASE_ADDRESS_MODIFY;
+	/* instruction */
+	*cs++ = batch_addr(batch) | BASE_ADDRESS_MODIFY;
+
+	/* general/dynamic/indirect/instruction access Bound */
+	*cs++ = 0;
+	*cs++ = BASE_ADDRESS_MODIFY;
+	*cs++ = 0;
+	*cs++ = BASE_ADDRESS_MODIFY;
+	*cs++ = 0;
+	*cs++ = 0;
+}
+
+static void
+gen7_emit_vfe_state(struct batch_chunk *batch,
+		    const struct batch_vals *bv,
+		    u32 urb_size, u32 curbe_size,
+		    u32 mode)
+{
+	u32 urb_entries = bv->max_urb_entries;
+	u32 threads = bv->max_primitives - 1;
+	u32 *cs = batch_alloc_items(batch, 32, 8);
+
+	*cs++ = MEDIA_VFE_STATE | (8 - 2);
+
+	/* scratch buffer */
+	*cs++ = 0;
+
+	/* number of threads & urb entries for GPGPU vs Media Mode */
+	*cs++ = threads << 16 | urb_entries << 8 | mode << 2;
+
+	*cs++ = 0;
+
+	/* urb entry size & curbe size in 256 bits unit */
+	*cs++ = urb_size << 16 | curbe_size;
+
+	/* scoreboard */
+	*cs++ = 0;
+	*cs++ = 0;
+	*cs++ = 0;
+}
+
+static void
+gen7_emit_interface_descriptor_load(struct batch_chunk *batch,
+				    const u32 interface_descriptor,
+				    unsigned int count)
+{
+	u32 *cs = batch_alloc_items(batch, 8, 4);
+
+	*cs++ = MEDIA_INTERFACE_DESCRIPTOR_LOAD | (4 - 2);
+	*cs++ = 0;
+	*cs++ = count * 8 * sizeof(*cs);
+
+	/*
+	 * interface descriptor address - it is relative to the dynamics base
+	 * address
+	 */
+	*cs++ = interface_descriptor;
+}
+
+static void
+gen7_emit_media_object(struct batch_chunk *batch,
+		       unsigned int media_object_index)
+{
+	unsigned int x_offset = (media_object_index % 16) * 64;
+	unsigned int y_offset = (media_object_index / 16) * 16;
+	unsigned int inline_data_size;
+	unsigned int media_batch_size;
+	unsigned int i;
+	u32 *cs;
+
+	inline_data_size = 112 * 8;
+	media_batch_size = inline_data_size + 6;
+
+	cs = batch_alloc_items(batch, 8, media_batch_size);
+
+	*cs++ = MEDIA_OBJECT | (media_batch_size - 2);
+
+	/* interface descriptor offset */
+	*cs++ = 0;
+
+	/* without indirect data */
+	*cs++ = 0;
+	*cs++ = 0;
+
+	/* scoreboard */
+	*cs++ = 0;
+	*cs++ = 0;
+
+	/* inline */
+	*cs++ = (y_offset << 16) | (x_offset);
+	*cs++ = 0;
+	*cs++ = GT3_INLINE_DATA_DELAYS;
+	for (i = 3; i < inline_data_size; i++)
+		*cs++ = 0;
+}
+
+static void gen7_emit_pipeline_flush(struct batch_chunk *batch)
+{
+	u32 *cs = batch_alloc_items(batch, 0, 5);
+
+	*cs++ = GFX_OP_PIPE_CONTROL(5);
+	*cs++ = PIPE_CONTROL_STATE_CACHE_INVALIDATE |
+		PIPE_CONTROL_GLOBAL_GTT_IVB;
+	*cs++ = 0;
+	*cs++ = 0;
+	*cs++ = 0;
+}
+
+static void emit_batch(struct i915_vma * const vma,
+		       u32 *start,
+		       const struct batch_vals *bv)
+{
+	struct drm_i915_private *i915 = vma->vm->i915;
+	unsigned int desc_count = 64;
+	const u32 urb_size = 112;
+	struct batch_chunk cmds, state;
+	u32 interface_descriptor;
+	unsigned int i;
+
+	batch_init(&cmds, vma, start, 0, bv->cmd_size);
+	batch_init(&state, vma, start, bv->state_start, bv->state_size);
+
+	interface_descriptor =
+		gen7_fill_interface_descriptor(&state, bv,
+					       IS_HASWELL(i915) ?
+					       &cb_kernel_hsw : &cb_kernel_gen7,
+					       desc_count);
+	gen7_emit_pipeline_flush(&cmds);
+	batch_add(&cmds, PIPELINE_SELECT | PIPELINE_SELECT_MEDIA);
+	batch_add(&cmds, MI_NOOP);
+	gen7_emit_state_base_address(&cmds, interface_descriptor);
+	gen7_emit_pipeline_flush(&cmds);
+
+	gen7_emit_vfe_state(&cmds, bv, urb_size - 1, 0, 0);
+
+	gen7_emit_interface_descriptor_load(&cmds,
+					    interface_descriptor,
+					    desc_count);
+
+	for (i = 0; i < bv->max_primitives; i++)
+		gen7_emit_media_object(&cmds, i);
+
+	batch_add(&cmds, MI_BATCH_BUFFER_END);
+}
+
+int gen7_setup_clear_gpr_bb(struct intel_engine_cs * const engine,
+			    struct i915_vma * const vma)
+{
+	struct batch_vals bv;
+	u32 *batch;
+
+	batch_get_defaults(engine->i915, &bv);
+	if (!vma)
+		return bv.max_size;
+
+	GEM_BUG_ON(vma->obj->base.size < bv.max_size);
+
+	batch = i915_gem_object_pin_map(vma->obj, I915_MAP_WC);
+	if (IS_ERR(batch))
+		return PTR_ERR(batch);
+
+	emit_batch(vma, memset(batch, 0, bv.max_size), &bv);
+
+	i915_gem_object_flush_map(vma->obj);
+	i915_gem_object_unpin_map(vma->obj);
+
+	return 0;
+}
diff --git a/drivers/gpu/drm/i915/gt/gen7_renderclear.h b/drivers/gpu/drm/i915/gt/gen7_renderclear.h
new file mode 100644
index 000000000000..4b88dd8d0fd4
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/gen7_renderclear.h
@@ -0,0 +1,16 @@ 
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#ifndef __GEN7_RENDERCLEAR_H__
+#define __GEN7_RENDERCLEAR_H__
+
+#define batch_advance(Y, CS) GEM_BUG_ON((Y)->end != (CS))
+struct intel_engine_cs;
+struct i915_vma;
+
+int gen7_setup_clear_gpr_bb(struct intel_engine_cs * const engine,
+			    struct i915_vma * const vma);
+
+#endif /* __GEN7_RENDERCLEAR_H__ */
diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
index 51b8718513bc..f04214a54f75 100644
--- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
+++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
@@ -292,10 +292,21 @@ 
 #define MI_STORE_URB_MEM        MI_INSTR(0x2D, 0)
 #define MI_CONDITIONAL_BATCH_BUFFER_END MI_INSTR(0x36, 0)
 
-#define PIPELINE_SELECT                ((0x3<<29)|(0x1<<27)|(0x1<<24)|(0x4<<16))
-#define GFX_OP_3DSTATE_VF_STATISTICS   ((0x3<<29)|(0x1<<27)|(0x0<<24)|(0xB<<16))
-#define MEDIA_VFE_STATE                ((0x3<<29)|(0x2<<27)|(0x0<<24)|(0x0<<16))
+#define STATE_BASE_ADDRESS \
+	((0x3 << 29) | (0x0 << 27) | (0x1 << 24) | (0x1 << 16))
+#define BASE_ADDRESS_MODIFY		REG_BIT(0)
+#define PIPELINE_SELECT \
+	((0x3 << 29) | (0x1 << 27) | (0x1 << 24) | (0x4 << 16))
+#define PIPELINE_SELECT_MEDIA	       REG_BIT(0)
+#define GFX_OP_3DSTATE_VF_STATISTICS \
+	((0x3 << 29) | (0x1 << 27) | (0x0 << 24) | (0xB << 16))
+#define MEDIA_VFE_STATE \
+	((0x3 << 29) | (0x2 << 27) | (0x0 << 24) | (0x0 << 16))
 #define  MEDIA_VFE_STATE_MMIO_ACCESS_MASK (0x18)
+#define MEDIA_INTERFACE_DESCRIPTOR_LOAD \
+	((0x3 << 29) | (0x2 << 27) | (0x0 << 24) | (0x2 << 16))
+#define MEDIA_OBJECT \
+	((0x3 << 29) | (0x2 << 27) | (0x1 << 24) | (0x0 << 16))
 #define GPGPU_OBJECT                   ((0x3<<29)|(0x2<<27)|(0x1<<24)|(0x4<<16))
 #define GPGPU_WALKER                   ((0x3<<29)|(0x2<<27)|(0x1<<24)|(0x5<<16))
 #define GFX_OP_3DSTATE_DX9_CONSTANTF_VS \
diff --git a/drivers/gpu/drm/i915/gt/intel_ring_submission.c b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
index 204c450b7c42..854979b79a1e 100644
--- a/drivers/gpu/drm/i915/gt/intel_ring_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
@@ -34,6 +34,7 @@ 
 #include "gem/i915_gem_context.h"
 
 #include "gen6_ppgtt.h"
+#include "gen7_renderclear.h"
 #include "i915_drv.h"
 #include "i915_trace.h"
 #include "intel_context.h"
@@ -1984,7 +1985,7 @@  static void setup_vecs(struct intel_engine_cs *engine)
 static int gen7_ctx_switch_bb_setup(struct intel_engine_cs * const engine,
 				    struct i915_vma * const vma)
 {
-	return 0;
+	return gen7_setup_clear_gpr_bb(engine, vma);
 }
 
 static int gen7_ctx_switch_bb_init(struct intel_engine_cs *engine)
diff --git a/drivers/gpu/drm/i915/i915_utils.h b/drivers/gpu/drm/i915/i915_utils.h
index b0ade76bec90..7ac5b3565845 100644
--- a/drivers/gpu/drm/i915/i915_utils.h
+++ b/drivers/gpu/drm/i915/i915_utils.h
@@ -172,6 +172,11 @@  __check_struct_size(size_t base, size_t arr, size_t count, size_t *size)
 	(typeof(ptr))(__v + 1);						\
 })
 
+#define ptr_align(ptr, align) ({					\
+	unsigned long __v = (unsigned long)(ptr);			\
+	(typeof(ptr))round_up(__v, (align));				\
+})
+
 #define page_mask_bits(ptr) ptr_mask_bits(ptr, PAGE_SHIFT)
 #define page_unmask_bits(ptr) ptr_unmask_bits(ptr, PAGE_SHIFT)
 #define page_pack_bits(ptr, bits) ptr_pack_bits(ptr, bits, PAGE_SHIFT)