[PATCH 3/5] drm/amd/sriov add mmsch_v3 interface
Zhang, Jack (Jian)
Jack.Zhang1 at amd.com
Tue Jul 14 09:00:55 UTC 2020
Hi, Dennis,
I gave some feedback in the comments.
Thank you for your review.
Best Regards,
Jack Zhang
-----Original Message-----
From: Li, Dennis <Dennis.Li at amd.com>
Sent: Tuesday, July 14, 2020 12:35 PM
To: Zhang, Jack (Jian) <Jack.Zhang1 at amd.com>; amd-gfx at lists.freedesktop.org
Cc: Zhang, Jack (Jian) <Jack.Zhang1 at amd.com>; Liu, Leo <Leo.Liu at amd.com>; Zhang, Hawking <Hawking.Zhang at amd.com>
Subject: RE: [PATCH 3/5] drm/amd/sriov add mmsch_v3 interface
[AMD Official Use Only - Internal Distribution Only]
Hi, Jack,
Please see the following comments.
Best Regards
Dennis Li
-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Jack Zhang
Sent: Tuesday, July 14, 2020 10:47 AM
To: amd-gfx at lists.freedesktop.org
Cc: Zhang, Jack (Jian) <Jack.Zhang1 at amd.com>; Liu, Leo <Leo.Liu at amd.com>; Zhang, Hawking <Hawking.Zhang at amd.com>
Subject: [PATCH 3/5] drm/amd/sriov add mmsch_v3 interface
For VCN3.0 SRIOV, Guest driver needs to communicate with mmsch to set the World Switch for MM appropriately. This patch add the interface for mmsch_v3.0.
Signed-off-by: Jack Zhang <Jack.Zhang1 at amd.com>
---
drivers/gpu/drm/amd/amdgpu/mmsch_v3_0.h | 130 ++++++++++++++++++++++++
1 file changed, 130 insertions(+)
create mode 100644 drivers/gpu/drm/amd/amdgpu/mmsch_v3_0.h
diff --git a/drivers/gpu/drm/amd/amdgpu/mmsch_v3_0.h b/drivers/gpu/drm/amd/amdgpu/mmsch_v3_0.h
new file mode 100644
index 000000000000..3e4e858a6965
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/mmsch_v3_0.h
@@ -0,0 +1,130 @@
+/*
+ * Copyright 2020 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person
+obtaining a
+ * copy of this software and associated documentation files (the
+"Software"),
+ * to deal in the Software without restriction, including without
+limitation
+ * the rights to use, copy, modify, merge, publish, distribute,
+sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom
+the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM,
+DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
+OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef __MMSCH_V3_0_H__
+#define __MMSCH_V3_0_H__
+
+#include "amdgpu_vcn.h"
+
+#define MMSCH_VERSION_MAJOR 3
+#define MMSCH_VERSION_MINOR 0
+#define MMSCH_VERSION (MMSCH_VERSION_MAJOR << 16 | MMSCH_VERSION_MINOR)
+
+enum mmsch_v3_0_command_type {
+ MMSCH_COMMAND__DIRECT_REG_WRITE = 0,
+ MMSCH_COMMAND__DIRECT_REG_POLLING = 2,
+ MMSCH_COMMAND__DIRECT_REG_READ_MODIFY_WRITE = 3,
+ MMSCH_COMMAND__INDIRECT_REG_WRITE = 8,
+ MMSCH_COMMAND__END = 0xf
+};
+
+struct mmsch_v3_0_table_info {
+ uint32_t init_status;
+ uint32_t table_offset;
+ uint32_t table_size;
+};
+
+struct mmsch_v3_0_init_header {
+ uint32_t version;
+ uint32_t total_size;
+ struct mmsch_v3_0_table_info inst[AMDGPU_MAX_VCN_INSTANCES]; };
[Dennis] You have defined total_size, why inst size is AMDGPU_MAX_VCN_INSTANCES, which will cause memory waste.
[Jack] In our case, AMDGPU_MAX_VCN_INSTANCES is a fixed number, which equals 2. And struct mmsch_v3_0_table_info occupy 3 dws. Thus there's not too much memory waste.
+struct mmsch_v3_0_cmd_direct_reg_header {
+ uint32_t reg_offset : 28;
+ uint32_t command_type : 4;
+};
+
+struct mmsch_v3_0_cmd_indirect_reg_header {
+ uint32_t reg_offset : 20;
+ uint32_t reg_idx_space : 8;
+ uint32_t command_type : 4;
+};
+
+struct mmsch_v3_0_cmd_direct_write {
+ struct mmsch_v3_0_cmd_direct_reg_header cmd_header;
+ uint32_t reg_value;
+};
+
+struct mmsch_v3_0_cmd_direct_read_modify_write {
+ struct mmsch_v3_0_cmd_direct_reg_header cmd_header;
+ uint32_t write_data;
+ uint32_t mask_value;
+};
+
+struct mmsch_v3_0_cmd_direct_polling {
+ struct mmsch_v3_0_cmd_direct_reg_header cmd_header;
+ uint32_t mask_value;
+ uint32_t wait_value;
+};
+
+struct mmsch_v3_0_cmd_end {
+ struct mmsch_v3_0_cmd_direct_reg_header cmd_header; };
+
+struct mmsch_v3_0_cmd_indirect_write {
+ struct mmsch_v3_0_cmd_indirect_reg_header cmd_header;
+ uint32_t reg_value;
+};
+
+#define MMSCH_V3_0_INSERT_DIRECT_RD_MOD_WT(reg, mask, data) { \
+ size = sizeof(struct mmsch_v3_0_cmd_direct_read_modify_write); \
+ size_dw = size / 4; \
+ direct_rd_mod_wt.cmd_header.reg_offset = reg; \
+ direct_rd_mod_wt.mask_value = mask; \
+ direct_rd_mod_wt.write_data = data; \
+ memcpy((void *)table_loc, &direct_rd_mod_wt, size); \
+ table_loc += size_dw; \
+ table_size += size_dw; \
+}
[Dennis] direct_rd_mod_wt, table_loc and table_size are local variables, it is better not to define them in macro, which are not very readable.
[Jack] we inherited the code format from mmsch_v2.0 and mmsch_v1.0. And It will only be used in sriov. So it is not very convenient to re-arch the implemention of this part.
+#define MMSCH_V3_0_INSERT_DIRECT_WT(reg, value) { \
+ size = sizeof(struct mmsch_v3_0_cmd_direct_write); \
+ size_dw = size / 4; \
+ direct_wt.cmd_header.reg_offset = reg; \
+ direct_wt.reg_value = value; \
+ memcpy((void *)table_loc, &direct_wt, size); \
+ table_loc += size_dw; \
+ table_size += size_dw; \
+}
+
+#define MMSCH_V3_0_INSERT_DIRECT_POLL(reg, mask, wait) { \
+ size = sizeof(struct mmsch_v3_0_cmd_direct_polling); \
+ size_dw = size / 4; \
+ direct_poll.cmd_header.reg_offset = reg; \
+ direct_poll.mask_value = mask; \
+ direct_poll.wait_value = wait; \
+ memcpy((void *)table_loc, &direct_poll, size); \
+ table_loc += size_dw; \
+ table_size += size_dw; \
+}
[Dennis] The same as the above
+#define MMSCH_V3_0_INSERT_END() { \
+ size = sizeof(struct mmsch_v3_0_cmd_end); \
+ size_dw = size / 4; \
+ memcpy((void *)table_loc, &end, size); \
+ table_loc += size_dw; \
+ table_size += size_dw; \
+}
[Dennis] The same as the above
+#endif
--
2.17.1
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