drm/amdgpu/gfx: Improvement on EDC GPR workarounds

SPI limits total CS waves in flight per SE to no more than 32 * num_cu and
we need to stuff 40 waves on a CU to completely clean the SGPR. This is
accomplished in the WR by cleaning the SE in two steps, half of the CU per
step.

Signed-off-by: James Zhu <James.Zhu@amd.com>
Reviewed-by: Yong Zhao <Yong.Zhao@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 1743fe2..2616f1b 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -3938,24 +3938,37 @@ static const struct soc15_reg_entry vgpr_init_regs[] = {
    { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_STATIC_THREAD_MGMT_SE1), 0xffffffff },
    { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_STATIC_THREAD_MGMT_SE2), 0xffffffff },
    { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_STATIC_THREAD_MGMT_SE3), 0xffffffff },
-   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_RESOURCE_LIMITS), 0x1000000 }, /* CU_GROUP_COUNT=1 */
-   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_NUM_THREAD_X), 256*2 },
-   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_NUM_THREAD_Y), 1 },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_RESOURCE_LIMITS), 0x0000000 },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_NUM_THREAD_X), 0x40 },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_NUM_THREAD_Y), 4 },
    { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_NUM_THREAD_Z), 1 },
-   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_PGM_RSRC1), 0x100007f }, /* VGPRS=15 (256 logical VGPRs, SGPRS=1 (16 SGPRs, BULKY=1 */
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_PGM_RSRC1), 0x3f },
    { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_PGM_RSRC2), 0x400000 },  /* 64KB LDS */
 };
 
-static const struct soc15_reg_entry sgpr_init_regs[] = {
-   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_STATIC_THREAD_MGMT_SE0), 0xffffffff },
-   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_STATIC_THREAD_MGMT_SE1), 0xffffffff },
-   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_STATIC_THREAD_MGMT_SE2), 0xffffffff },
-   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_STATIC_THREAD_MGMT_SE3), 0xffffffff },
-   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_RESOURCE_LIMITS), 0x1000000 }, /* CU_GROUP_COUNT=1 */
-   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_NUM_THREAD_X), 256*2 },
-   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_NUM_THREAD_Y), 1 },
+static const struct soc15_reg_entry sgpr1_init_regs[] = {
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_STATIC_THREAD_MGMT_SE0), 0x000000ff },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_STATIC_THREAD_MGMT_SE1), 0x000000ff },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_STATIC_THREAD_MGMT_SE2), 0x000000ff },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_STATIC_THREAD_MGMT_SE3), 0x000000ff },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_RESOURCE_LIMITS), 0x0000000 },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_NUM_THREAD_X), 0x40 },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_NUM_THREAD_Y), 8 },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_NUM_THREAD_Z), 1 },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_PGM_RSRC1), 0x240 }, /* (80 GPRS) */
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_PGM_RSRC2), 0x0 },
+};
+
+static const struct soc15_reg_entry sgpr2_init_regs[] = {
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_STATIC_THREAD_MGMT_SE0), 0x0000ff00 },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_STATIC_THREAD_MGMT_SE1), 0x0000ff00 },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_STATIC_THREAD_MGMT_SE2), 0x0000ff00 },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_STATIC_THREAD_MGMT_SE3), 0x0000ff00 },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_RESOURCE_LIMITS), 0x0000000 },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_NUM_THREAD_X), 0x40 },
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_NUM_THREAD_Y), 8 },
    { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_NUM_THREAD_Z), 1 },
-   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_PGM_RSRC1), 0x340 }, /* SGPRS=13 (112 GPRS) */
+   { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_PGM_RSRC1), 0x240 }, /* (80 GPRS) */
    { SOC15_REG_ENTRY(GC, 0, mmCOMPUTE_PGM_RSRC2), 0x0 },
 };
 
@@ -4065,7 +4078,9 @@ static int gfx_v9_0_do_edc_gpr_workarounds(struct amdgpu_device *adev)
        total_size =
                ((ARRAY_SIZE(vgpr_init_regs) * 3) + 4 + 5 + 2) * 4;
        total_size +=
-               ((ARRAY_SIZE(sgpr_init_regs) * 3) + 4 + 5 + 2) * 4;
+               ((ARRAY_SIZE(sgpr1_init_regs) * 3) + 4 + 5 + 2) * 4;
+       total_size +=
+               ((ARRAY_SIZE(sgpr2_init_regs) * 3) + 4 + 5 + 2) * 4;
        total_size = ALIGN(total_size, 256);
        vgpr_offset = total_size;
        total_size += ALIGN(sizeof(vgpr_init_compute_shader), 256);
@@ -4108,7 +4123,35 @@ static int gfx_v9_0_do_edc_gpr_workarounds(struct amdgpu_device *adev)
 
        /* write dispatch packet */
        ib.ptr[ib.length_dw++] = PACKET3(PACKET3_DISPATCH_DIRECT, 3);
-       ib.ptr[ib.length_dw++] = 256; /* x */
+       ib.ptr[ib.length_dw++] = 0x40*2; /* x */
+       ib.ptr[ib.length_dw++] = 1; /* y */
+       ib.ptr[ib.length_dw++] = 1; /* z */
+       ib.ptr[ib.length_dw++] =
+               REG_SET_FIELD(0, COMPUTE_DISPATCH_INITIATOR, COMPUTE_SHADER_EN, 1);
+
+       /* write CS partial flush packet */
+       ib.ptr[ib.length_dw++] = PACKET3(PACKET3_EVENT_WRITE, 0);
+       ib.ptr[ib.length_dw++] = EVENT_TYPE(7) | EVENT_INDEX(4);
+
+       /* SGPR1 */
+       /* write the register state for the compute dispatch */
+       for (i = 0; i < ARRAY_SIZE(sgpr1_init_regs); i++) {
+               ib.ptr[ib.length_dw++] = PACKET3(PACKET3_SET_SH_REG, 1);
+               ib.ptr[ib.length_dw++] = SOC15_REG_ENTRY_OFFSET(sgpr1_init_regs[i])
+                                                               - PACKET3_SET_SH_REG_START;
+               ib.ptr[ib.length_dw++] = sgpr1_init_regs[i].reg_value;
+       }
+       /* write the shader start address: mmCOMPUTE_PGM_LO, mmCOMPUTE_PGM_HI */
+       gpu_addr = (ib.gpu_addr + (u64)sgpr_offset) >> 8;
+       ib.ptr[ib.length_dw++] = PACKET3(PACKET3_SET_SH_REG, 2);
+       ib.ptr[ib.length_dw++] = SOC15_REG_OFFSET(GC, 0, mmCOMPUTE_PGM_LO)
+                                                       - PACKET3_SET_SH_REG_START;
+       ib.ptr[ib.length_dw++] = lower_32_bits(gpu_addr);
+       ib.ptr[ib.length_dw++] = upper_32_bits(gpu_addr);
+
+       /* write dispatch packet */
+       ib.ptr[ib.length_dw++] = PACKET3(PACKET3_DISPATCH_DIRECT, 3);
+       ib.ptr[ib.length_dw++] = 0xA0*2; /* x */
        ib.ptr[ib.length_dw++] = 1; /* y */
        ib.ptr[ib.length_dw++] = 1; /* z */
        ib.ptr[ib.length_dw++] =
@@ -4118,13 +4161,13 @@ static int gfx_v9_0_do_edc_gpr_workarounds(struct amdgpu_device *adev)
        ib.ptr[ib.length_dw++] = PACKET3(PACKET3_EVENT_WRITE, 0);
        ib.ptr[ib.length_dw++] = EVENT_TYPE(7) | EVENT_INDEX(4);
 
-       /* SGPR */
+       /* SGPR2 */
        /* write the register state for the compute dispatch */
-       for (i = 0; i < ARRAY_SIZE(sgpr_init_regs); i++) {
+       for (i = 0; i < ARRAY_SIZE(sgpr2_init_regs); i++) {
                ib.ptr[ib.length_dw++] = PACKET3(PACKET3_SET_SH_REG, 1);
-               ib.ptr[ib.length_dw++] = SOC15_REG_ENTRY_OFFSET(sgpr_init_regs[i])
+               ib.ptr[ib.length_dw++] = SOC15_REG_ENTRY_OFFSET(sgpr2_init_regs[i])
                                                                - PACKET3_SET_SH_REG_START;
-               ib.ptr[ib.length_dw++] = sgpr_init_regs[i].reg_value;
+               ib.ptr[ib.length_dw++] = sgpr2_init_regs[i].reg_value;
        }
        /* write the shader start address: mmCOMPUTE_PGM_LO, mmCOMPUTE_PGM_HI */
        gpu_addr = (ib.gpu_addr + (u64)sgpr_offset) >> 8;
@@ -4136,7 +4179,7 @@ static int gfx_v9_0_do_edc_gpr_workarounds(struct amdgpu_device *adev)
 
        /* write dispatch packet */
        ib.ptr[ib.length_dw++] = PACKET3(PACKET3_DISPATCH_DIRECT, 3);
-       ib.ptr[ib.length_dw++] = 256; /* x */
+       ib.ptr[ib.length_dw++] = 0xA0*2; /* x */
        ib.ptr[ib.length_dw++] = 1; /* y */
        ib.ptr[ib.length_dw++] = 1; /* z */
        ib.ptr[ib.length_dw++] =