[V2 04/11] drm/amdgpu/virt: use kiq to access registers

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Am 10.01.2017 um 15:01 schrieb Yu, Xiangliang:
>> -----Original Message-----
>> From: Christian König [mailto:deathsimple at vodafone.de]
>> Sent: Tuesday, January 10, 2017 9:09 PM
>> To: Yu, Xiangliang <Xiangliang.Yu at amd.com>; amd-
>> gfx at lists.freedesktop.org
>> Subject: Re: [V2 04/11] drm/amdgpu/virt: use kiq to access registers
>>
>> Am 10.01.2017 um 11:00 schrieb Xiangliang Yu:
>>> 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);
>> Why do you grab and release an extra fence reference here?
> KIQ ring has no scheduler, I think we need to take care fence.

No, that is nonsense. Fence reference counting is completely separate to 
the scheduler.

Please just drop the extra fence_get()/fence_put() dance here.

amdgpu_fence_emit() returns the fence with one reference held which you 
need to drop before "f" leaves scope here. No need for anything else.

Regards,
Christian.

>
>>> +	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) {




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