[V2 04/11] drm/amdgpu/virt: use kiq to access registers
Xiangliang Yu
Xiangliang.Yu at amd.com
Tue Jan 10 10:00:43 UTC 2017
For virtualization, it is must for driver to use KIQ to access
registers when it is out of GPU full access mode.
Signed-off-by: Xiangliang Yu <Xiangliang.Yu at amd.com>
---
drivers/gpu/drm/amd/amdgpu/Makefile | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 6 +++
drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c | 86 ++++++++++++++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h | 5 ++
drivers/gpu/drm/amd/amdgpu/vi.c | 3 ++
5 files changed, 101 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
index 4185b03..0b8e470 100644
--- a/drivers/gpu/drm/amd/amdgpu/Makefile
+++ b/drivers/gpu/drm/amd/amdgpu/Makefile
@@ -30,7 +30,7 @@ amdgpu-y += amdgpu_device.o amdgpu_kms.o \
atombios_encoders.o amdgpu_sa.o atombios_i2c.o \
amdgpu_prime.o amdgpu_vm.o amdgpu_ib.o amdgpu_pll.o \
amdgpu_ucode.o amdgpu_bo_list.o amdgpu_ctx.o amdgpu_sync.o \
- amdgpu_gtt_mgr.o amdgpu_vram_mgr.o
+ amdgpu_gtt_mgr.o amdgpu_vram_mgr.o amdgpu_virt.o
# add asic specific block
amdgpu-$(CONFIG_DRM_AMDGPU_CIK)+= cik.o cik_ih.o kv_smc.o kv_dpm.o \
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index f82919d..9a2fd3e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -95,6 +95,9 @@ uint32_t amdgpu_mm_rreg(struct amdgpu_device *adev, uint32_t reg,
{
uint32_t ret;
+ if (amdgpu_sriov_runtime(adev) && !in_interrupt())
+ return amdgpu_virt_kiq_rreg(adev, reg);
+
if ((reg * 4) < adev->rmmio_size && !always_indirect)
ret = readl(((void __iomem *)adev->rmmio) + (reg * 4));
else {
@@ -114,6 +117,9 @@ void amdgpu_mm_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v,
{
trace_amdgpu_mm_wreg(adev->pdev->device, reg, v);
+ if (amdgpu_sriov_runtime(adev))
+ return amdgpu_virt_kiq_wreg(adev, reg, v);
+
if ((reg * 4) < adev->rmmio_size && !always_indirect)
writel(v, ((void __iomem *)adev->rmmio) + (reg * 4));
else {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
new file mode 100644
index 0000000..6520a4e
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2017 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.
+ */
+
+#include "amdgpu.h"
+#include "amdgpu_virt.h"
+
+void amdgpu_virt_init_setting(struct amdgpu_device *adev)
+{
+ mutex_init(&adev->virt.lock);
+}
+
+uint32_t amdgpu_virt_kiq_rreg(struct amdgpu_device *adev, uint32_t reg)
+{
+ signed long r;
+ uint32_t val;
+ struct fence *f;
+ struct amdgpu_kiq *kiq = &adev->gfx.kiq;
+ struct amdgpu_ring *ring = &kiq->ring;
+
+ BUG_ON(!ring->funcs->emit_rreg);
+
+ mutex_lock(&adev->virt.lock);
+ amdgpu_ring_alloc(ring, 32);
+ amdgpu_ring_emit_hdp_flush(ring);
+ amdgpu_ring_emit_rreg(ring, reg);
+ amdgpu_ring_emit_hdp_invalidate(ring);
+ amdgpu_fence_emit(ring, &f);
+ fence_get(f);
+ amdgpu_ring_commit(ring);
+ mutex_unlock(&adev->virt.lock);
+
+ r = fence_wait(f, false);
+ fence_put(f);
+ if (r)
+ DRM_ERROR("wait for kiq fence error: %ld.\n", r);
+ fence_put(f);
+
+ val = adev->wb.wb[adev->virt.val_offs];
+
+ return val;
+}
+
+void amdgpu_virt_kiq_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v)
+{
+ signed long r;
+ struct fence *f;
+ struct amdgpu_kiq *kiq = &adev->gfx.kiq;
+ struct amdgpu_ring *ring = &kiq->ring;
+
+ BUG_ON(!ring->funcs->emit_wreg);
+
+ mutex_lock(&adev->virt.lock);
+ amdgpu_ring_alloc(ring, 32);
+ amdgpu_ring_emit_hdp_flush(ring);
+ amdgpu_ring_emit_wreg(ring, reg, v);
+ amdgpu_ring_emit_hdp_invalidate(ring);
+ amdgpu_fence_emit(ring, &f);
+ fence_get(f);
+ amdgpu_ring_commit(ring);
+ mutex_unlock(&adev->virt.lock);
+
+ r = fence_wait(f, false);
+ fence_put(f);
+ if (r)
+ DRM_ERROR("wait for kiq fence error: %ld.\n", r);
+ fence_put(f);
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
index 79619b6..24f0590 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
@@ -33,6 +33,7 @@
struct amdgpu_virt {
uint32_t caps;
uint32_t val_offs;
+ struct mutex lock;
};
#define amdgpu_sriov_enabled(adev) \
@@ -59,4 +60,8 @@ static inline bool is_virtual_machine(void)
#endif
}
+void amdgpu_virt_init_setting(struct amdgpu_device *adev);
+uint32_t amdgpu_virt_kiq_rreg(struct amdgpu_device *adev, uint32_t reg);
+void amdgpu_virt_kiq_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v);
+
#endif
diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c b/drivers/gpu/drm/amd/amdgpu/vi.c
index 7350a8f..dc0d4fa 100644
--- a/drivers/gpu/drm/amd/amdgpu/vi.c
+++ b/drivers/gpu/drm/amd/amdgpu/vi.c
@@ -892,6 +892,9 @@ static int vi_common_early_init(void *handle)
(amdgpu_ip_block_mask & (1 << AMD_IP_BLOCK_TYPE_SMC)))
smc_enabled = true;
+ if (amdgpu_sriov_vf(adev))
+ amdgpu_virt_init_setting(adev);
+
adev->rev_id = vi_get_rev_id(adev);
adev->external_rev_id = 0xFF;
switch (adev->asic_type) {
--
2.7.4
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