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* [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage.
@ 2021-02-09 12:44 Sebastian Andrzej Siewior
  2021-02-09 12:44 ` [PATCH 1/3] drm/amdgpu: Replace in_interrupt() usage in gmc_v*_process_interrupt() Sebastian Andrzej Siewior
                   ` (3 more replies)
  0 siblings, 4 replies; 10+ messages in thread
From: Sebastian Andrzej Siewior @ 2021-02-09 12:44 UTC (permalink / raw)
  To: amd-gfx
  Cc: David Airlie, dri-devel, Daniel Vetter, Alex Deucher,
	Thomas Gleixner, Christian König

Folks,

in the discussion about preempt count consistency across kernel
configurations:

 https://lore.kernel.org/r/20200914204209.256266093@linutronix.de/

it was concluded that the usage of in_interrupt() and related context
checks should be removed from non-core code.

In the long run, usage of 'preemptible, in_*irq etc.' should be banned from
driver code completely.

This series addresses parts of the amdgpu driver.  There are still call sites
left in in the amdgpu driver.

v1…v2:
   - Limit to admgpu only
   - use "bool" instead of "bool == true"

Sebastian


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^ permalink raw reply	[flat|nested] 10+ messages in thread

* [PATCH 1/3] drm/amdgpu: Replace in_interrupt() usage in gmc_v*_process_interrupt()
  2021-02-09 12:44 [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage Sebastian Andrzej Siewior
@ 2021-02-09 12:44 ` Sebastian Andrzej Siewior
  2021-02-09 12:44 ` [PATCH 2/3] drm/amdgpu: Remove in_interrupt() usage in gfx_v9_0_kiq_read_clock() Sebastian Andrzej Siewior
                   ` (2 subsequent siblings)
  3 siblings, 0 replies; 10+ messages in thread
From: Sebastian Andrzej Siewior @ 2021-02-09 12:44 UTC (permalink / raw)
  To: amd-gfx
  Cc: David Airlie, Sebastian Andrzej Siewior, dri-devel,
	Daniel Vetter, Alex Deucher, Thomas Gleixner,
	Christian König

The usage of in_interrupt() in gmc_v*_process_interrupt() is intended to
use a different code path if invoked from the interrupt handler vs
invoked from the workqueue.

The usage of in_interrupt() in drivers is phased out and Linus clearly
requested that code which changes behaviour depending on context should
either be separated or the context be conveyed in an argument passed by the
caller, which usually knows the context.

gmc_v*_process_interrupt() is invoked via the ->process() callback
from amdgpu_ih_process() which in turn is invoked either from
amdgpu_irq_handler() (the interrupt handler) or from
amdgpu_irq_handle_*() which is a workqueue.

amdgpu_irq::ih is always processed from the interrupt handler, the other
three struct amdgpu_ih_ring members are processed from a workqueue.

Replace the in_interrupt() check with a comparison against adev->irq.ih.
A similar check is already done to check if the ih pointer is from
ih_soft.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c | 2 +-
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
index 3b7c6c31fce1f..7b6791d699e27 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
@@ -113,7 +113,7 @@ static int gmc_v10_0_process_interrupt(struct amdgpu_device *adev,
 		/* Delegate it to a different ring if the hardware hasn't
 		 * already done it.
 		 */
-		if (in_interrupt()) {
+		if (entry->ih == &adev->irq.ih) {
 			amdgpu_irq_delegate(adev, entry, 8);
 			return 1;
 		}
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index aedef9017c4c2..266296be7302d 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -486,7 +486,7 @@ static int gmc_v9_0_process_interrupt(struct amdgpu_device *adev,
 		/* Delegate it to a different ring if the hardware hasn't
 		 * already done it.
 		 */
-		if (in_interrupt()) {
+		if (entry->ih == &adev->irq.ih) {
 			amdgpu_irq_delegate(adev, entry, 8);
 			return 1;
 		}
-- 
2.30.0

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^ permalink raw reply related	[flat|nested] 10+ messages in thread

* [PATCH 2/3] drm/amdgpu: Remove in_interrupt() usage in gfx_v9_0_kiq_read_clock()
  2021-02-09 12:44 [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage Sebastian Andrzej Siewior
  2021-02-09 12:44 ` [PATCH 1/3] drm/amdgpu: Replace in_interrupt() usage in gmc_v*_process_interrupt() Sebastian Andrzej Siewior
@ 2021-02-09 12:44 ` Sebastian Andrzej Siewior
  2021-02-09 12:44 ` [PATCH 3/3] drm/amdgpu: Replace in_task() in gfx_v8_0_parse_sq_irq() Sebastian Andrzej Siewior
  2021-02-09 12:50 ` [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage Christian König
  3 siblings, 0 replies; 10+ messages in thread
From: Sebastian Andrzej Siewior @ 2021-02-09 12:44 UTC (permalink / raw)
  To: amd-gfx
  Cc: David Airlie, Sebastian Andrzej Siewior, dri-devel,
	Daniel Vetter, Alex Deucher, Thomas Gleixner,
	Christian König

gfx_v9_0_get_gpu_clock_counter() acquires a mutex_t lock and is the only
caller of gfx_v9_0_kiq_read_clock().
If it safe to acquire a mutex_t then gfx_v9_0_get_gpu_clock_counter() is
always invoked from preemptible context.

Remove in_interrupt() because it superfluous as it will always return
false.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index ca7e7264926e6..72c319b860a33 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -4105,7 +4105,7 @@ static uint64_t gfx_v9_0_kiq_read_clock(struct amdgpu_device *adev)
 	 *
 	 * also don't wait anymore for IRQ context
 	 * */
-	if (r < 1 && (amdgpu_in_reset(adev) || in_interrupt()))
+	if (r < 1 && (amdgpu_in_reset(adev)))
 		goto failed_kiq_read;
 
 	might_sleep();
-- 
2.30.0

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^ permalink raw reply related	[flat|nested] 10+ messages in thread

* [PATCH 3/3] drm/amdgpu: Replace in_task() in gfx_v8_0_parse_sq_irq()
  2021-02-09 12:44 [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage Sebastian Andrzej Siewior
  2021-02-09 12:44 ` [PATCH 1/3] drm/amdgpu: Replace in_interrupt() usage in gmc_v*_process_interrupt() Sebastian Andrzej Siewior
  2021-02-09 12:44 ` [PATCH 2/3] drm/amdgpu: Remove in_interrupt() usage in gfx_v9_0_kiq_read_clock() Sebastian Andrzej Siewior
@ 2021-02-09 12:44 ` Sebastian Andrzej Siewior
  2021-02-09 12:50 ` [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage Christian König
  3 siblings, 0 replies; 10+ messages in thread
From: Sebastian Andrzej Siewior @ 2021-02-09 12:44 UTC (permalink / raw)
  To: amd-gfx
  Cc: David Airlie, Sebastian Andrzej Siewior, dri-devel,
	Daniel Vetter, Alex Deucher, Thomas Gleixner,
	Christian König

gfx_v8_0_parse_sq_irq() is using in_task() to distinguish if it is
invoked from a workqueue worker or directly from the interrupt handler.

The usage of in_interrupt() in drivers is phased out and Linus clearly
requested that code which changes behaviour depending on context should
either be separated or the context be conveyed in an argument passed by the
caller, which usually knows the context.

gfx_v8_0_parse_sq_irq() is invoked directly either from a worker or from
the interrupt service routine. The worker is only bypassed if the worker
is already busy.

Add an argument `from_wq' to gfx_v8_0_parse_sq_irq() which is true if
invoked from the worker.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
index 37639214cbbbd..f346afce82ea0 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
@@ -6719,7 +6719,8 @@ static int gfx_v8_0_cp_ecc_error_irq(struct amdgpu_device *adev,
 	return 0;
 }
 
-static void gfx_v8_0_parse_sq_irq(struct amdgpu_device *adev, unsigned ih_data)
+static void gfx_v8_0_parse_sq_irq(struct amdgpu_device *adev, unsigned ih_data,
+				  bool from_wq)
 {
 	u32 enc, se_id, sh_id, cu_id;
 	char type[20];
@@ -6757,7 +6758,7 @@ static void gfx_v8_0_parse_sq_irq(struct amdgpu_device *adev, unsigned ih_data)
 			 * or from BH in which case we can access SQ_EDC_INFO
 			 * instance
 			 */
-			if (in_task()) {
+			if (from_wq) {
 				mutex_lock(&adev->grbm_idx_mutex);
 				gfx_v8_0_select_se_sh(adev, se_id, sh_id, cu_id);
 
@@ -6795,7 +6796,7 @@ static void gfx_v8_0_sq_irq_work_func(struct work_struct *work)
 	struct amdgpu_device *adev = container_of(work, struct amdgpu_device, gfx.sq_work.work);
 	struct sq_work *sq_work = container_of(work, struct sq_work, work);
 
-	gfx_v8_0_parse_sq_irq(adev, sq_work->ih_data);
+	gfx_v8_0_parse_sq_irq(adev, sq_work->ih_data, true);
 }
 
 static int gfx_v8_0_sq_irq(struct amdgpu_device *adev,
@@ -6810,7 +6811,7 @@ static int gfx_v8_0_sq_irq(struct amdgpu_device *adev,
 	 * just print whatever info is possible directly from the ISR.
 	 */
 	if (work_pending(&adev->gfx.sq_work.work)) {
-		gfx_v8_0_parse_sq_irq(adev, ih_data);
+		gfx_v8_0_parse_sq_irq(adev, ih_data, false);
 	} else {
 		adev->gfx.sq_work.ih_data = ih_data;
 		schedule_work(&adev->gfx.sq_work.work);
-- 
2.30.0

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^ permalink raw reply related	[flat|nested] 10+ messages in thread

* Re: [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage.
  2021-02-09 12:44 [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage Sebastian Andrzej Siewior
                   ` (2 preceding siblings ...)
  2021-02-09 12:44 ` [PATCH 3/3] drm/amdgpu: Replace in_task() in gfx_v8_0_parse_sq_irq() Sebastian Andrzej Siewior
@ 2021-02-09 12:50 ` Christian König
  2021-02-09 16:53   ` Sebastian Andrzej Siewior
  2021-03-11 15:45   ` Alex Deucher
  3 siblings, 2 replies; 10+ messages in thread
From: Christian König @ 2021-02-09 12:50 UTC (permalink / raw)
  To: Sebastian Andrzej Siewior, amd-gfx
  Cc: Alex Deucher, David Airlie, Thomas Gleixner, Daniel Vetter, dri-devel

Reviewed-by: Christian König <christian.koenig@amd.com> for the series.

Am 09.02.21 um 13:44 schrieb Sebastian Andrzej Siewior:
> Folks,
>
> in the discussion about preempt count consistency across kernel
> configurations:
>
>   https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fr%2F20200914204209.256266093%40linutronix.de%2F&amp;data=04%7C01%7Cchristian.koenig%40amd.com%7C66cfb449f0ba475dd76b08d8ccf87a85%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637484714876862283%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=g04sQoqvfkuHzplig%2F%2BOruqzmyypIhaqrkKU0xeIJ80%3D&amp;reserved=0
>
> it was concluded that the usage of in_interrupt() and related context
> checks should be removed from non-core code.
>
> In the long run, usage of 'preemptible, in_*irq etc.' should be banned from
> driver code completely.
>
> This series addresses parts of the amdgpu driver.  There are still call sites
> left in in the amdgpu driver.
>
> v1…v2:
>     - Limit to admgpu only
>     - use "bool" instead of "bool == true"
>
> Sebastian
>
>

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^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage.
  2021-02-09 12:50 ` [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage Christian König
@ 2021-02-09 16:53   ` Sebastian Andrzej Siewior
  2021-02-09 17:43     ` Christian König
  2021-03-11 15:45   ` Alex Deucher
  1 sibling, 1 reply; 10+ messages in thread
From: Sebastian Andrzej Siewior @ 2021-02-09 16:53 UTC (permalink / raw)
  To: Christian König
  Cc: David Airlie, dri-devel, amd-gfx, Daniel Vetter, Alex Deucher,
	Thomas Gleixner

On 2021-02-09 13:50:31 [+0100], Christian König wrote:
> Reviewed-by: Christian König <christian.koenig@amd.com> for the series.

Thank you.
Any chance you could give me a hand with the remaining three users
within the amdgpu driver? I don't know if the in_interrupt() check can
be limited to certain callers.
What I noticed while tracing v5.10 is this:

|             Xorg-2257    [007] d... 57261.620043: amdgpu_device_wreg: 0x699f, 0x00001bcf, 0x00000100
|  => trace_event_raw_event_amdgpu_device_wreg
|  => amdgpu_device_wreg.part.0
|  => dce110_arm_vert_intr
|  => dce110_vblank_set
|  => dm_enable_vblank
|  => drm_vblank_enable
|  => drm_vblank_get
|  => drm_wait_vblank_ioctl
|  => drm_ioctl_kernel
|  => drm_ioctl
|  => amdgpu_drm_ioctl
|  => __x64_sys_ioctl
|  => do_syscall_64
|  => entry_SYSCALL_64_after_hwframe

I think that amdgpu_device_wreg() -> amdgpu_kiq_wreg() could be invoked.
It doesn't here because amdgpu_sriov_runtime() is false.
The trace says `d' which means interrupts are disabled but
in_interrupt() will return false in this case (no IRQ/softirq).

Sebastian
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^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage.
  2021-02-09 16:53   ` Sebastian Andrzej Siewior
@ 2021-02-09 17:43     ` Christian König
  2021-03-10 17:47       ` Sebastian Andrzej Siewior
  0 siblings, 1 reply; 10+ messages in thread
From: Christian König @ 2021-02-09 17:43 UTC (permalink / raw)
  To: Sebastian Andrzej Siewior
  Cc: David Airlie, dri-devel, amd-gfx, Daniel Vetter, Alex Deucher,
	Thomas Gleixner

Hi Sebastian,

to be honest I'm thinking about that for quite some time now and I don't 
think that this is possible without a severe rewrite of the driver.

The problem is simply that we have a lot of functions which deal with 
hardware handling independent of the context. But how registers are 
accessed needs to be different depending if your are in the interrupt 
handler or not.

You would need to push the information if we are coming in from the 
interrupt handler through a > 10 function calls.

I don't think that this is feasible nor good design.

Regards,
Christian.

Am 09.02.21 um 17:53 schrieb Sebastian Andrzej Siewior:
> On 2021-02-09 13:50:31 [+0100], Christian König wrote:
>> Reviewed-by: Christian König <christian.koenig@amd.com> for the series.
> Thank you.
> Any chance you could give me a hand with the remaining three users
> within the amdgpu driver? I don't know if the in_interrupt() check can
> be limited to certain callers.
> What I noticed while tracing v5.10 is this:
>
> |             Xorg-2257    [007] d... 57261.620043: amdgpu_device_wreg: 0x699f, 0x00001bcf, 0x00000100
> |  => trace_event_raw_event_amdgpu_device_wreg
> |  => amdgpu_device_wreg.part.0
> |  => dce110_arm_vert_intr
> |  => dce110_vblank_set
> |  => dm_enable_vblank
> |  => drm_vblank_enable
> |  => drm_vblank_get
> |  => drm_wait_vblank_ioctl
> |  => drm_ioctl_kernel
> |  => drm_ioctl
> |  => amdgpu_drm_ioctl
> |  => __x64_sys_ioctl
> |  => do_syscall_64
> |  => entry_SYSCALL_64_after_hwframe
>
> I think that amdgpu_device_wreg() -> amdgpu_kiq_wreg() could be invoked.
> It doesn't here because amdgpu_sriov_runtime() is false.
> The trace says `d' which means interrupts are disabled but
> in_interrupt() will return false in this case (no IRQ/softirq).
>
> Sebastian

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^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage.
  2021-02-09 17:43     ` Christian König
@ 2021-03-10 17:47       ` Sebastian Andrzej Siewior
  2021-03-11 10:42         ` Christian König
  0 siblings, 1 reply; 10+ messages in thread
From: Sebastian Andrzej Siewior @ 2021-03-10 17:47 UTC (permalink / raw)
  To: Christian König
  Cc: David Airlie, dri-devel, amd-gfx, Daniel Vetter, Alex Deucher,
	Thomas Gleixner

On 2021-02-09 18:43:54 [+0100], Christian König wrote:
> Hi Sebastian,
Hi Christian,

> to be honest I'm thinking about that for quite some time now and I don't
> think that this is possible without a severe rewrite of the driver.
> 
> The problem is simply that we have a lot of functions which deal with
> hardware handling independent of the context. But how registers are accessed
> needs to be different depending if your are in the interrupt handler or not.
> 
> You would need to push the information if we are coming in from the
> interrupt handler through a > 10 function calls.
> 
> I don't think that this is feasible nor good design.

Yeah, that is what I saw and didn't even try.

The possible backtrace (at the bottom of this email) is this a correct
assumption?

Another quick question: You acked my three-patch series. I don't see it
in the next tree as of today. Is there anything for me to do?

> Regards,
> Christian.
> 
> Am 09.02.21 um 17:53 schrieb Sebastian Andrzej Siewior:
> > On 2021-02-09 13:50:31 [+0100], Christian König wrote:
> > > Reviewed-by: Christian König <christian.koenig@amd.com> for the series.
> > Thank you.
> > Any chance you could give me a hand with the remaining three users
> > within the amdgpu driver? I don't know if the in_interrupt() check can
> > be limited to certain callers.
> > What I noticed while tracing v5.10 is this:
> > 
> > |             Xorg-2257    [007] d... 57261.620043: amdgpu_device_wreg: 0x699f, 0x00001bcf, 0x00000100
> > |  => trace_event_raw_event_amdgpu_device_wreg
> > |  => amdgpu_device_wreg.part.0
> > |  => dce110_arm_vert_intr
> > |  => dce110_vblank_set
> > |  => dm_enable_vblank
> > |  => drm_vblank_enable
> > |  => drm_vblank_get
> > |  => drm_wait_vblank_ioctl
> > |  => drm_ioctl_kernel
> > |  => drm_ioctl
> > |  => amdgpu_drm_ioctl
> > |  => __x64_sys_ioctl
> > |  => do_syscall_64
> > |  => entry_SYSCALL_64_after_hwframe
> > 
> > I think that amdgpu_device_wreg() -> amdgpu_kiq_wreg() could be invoked.
> > It doesn't here because amdgpu_sriov_runtime() is false.
> > The trace says `d' which means interrupts are disabled but
> > in_interrupt() will return false in this case (no IRQ/softirq).
> > 
> > Sebastian

Sebastian
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^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage.
  2021-03-10 17:47       ` Sebastian Andrzej Siewior
@ 2021-03-11 10:42         ` Christian König
  0 siblings, 0 replies; 10+ messages in thread
From: Christian König @ 2021-03-11 10:42 UTC (permalink / raw)
  To: Sebastian Andrzej Siewior
  Cc: David Airlie, dri-devel, amd-gfx, Daniel Vetter, Alex Deucher,
	Thomas Gleixner

Hi Sebastian,

Am 10.03.21 um 18:47 schrieb Sebastian Andrzej Siewior:
> On 2021-02-09 18:43:54 [+0100], Christian König wrote:
>> to be honest I'm thinking about that for quite some time now and I don't
>> think that this is possible without a severe rewrite of the driver.
>>
>> The problem is simply that we have a lot of functions which deal with
>> hardware handling independent of the context. But how registers are accessed
>> needs to be different depending if your are in the interrupt handler or not.
>>
>> You would need to push the information if we are coming in from the
>> interrupt handler through a > 10 function calls.
>>
>> I don't think that this is feasible nor good design.
> Yeah, that is what I saw and didn't even try.

I also have no idea where to start.

> The possible backtrace (at the bottom of this email) is this a correct
> assumption?

It's one of many, yes. But the real complicated once are in the CS UAPI 
and interrupt handling.

>
> Another quick question: You acked my three-patch series. I don't see it
> in the next tree as of today. Is there anything for me to do?

Alex usually picks them up into amd-staging-drm-next which is then 
merged into drm-next.

Regards,
Christian.

>
>> Regards,
>> Christian.
>>
>> Am 09.02.21 um 17:53 schrieb Sebastian Andrzej Siewior:
>>> On 2021-02-09 13:50:31 [+0100], Christian König wrote:
>>>> Reviewed-by: Christian König <christian.koenig@amd.com> for the series.
>>> Thank you.
>>> Any chance you could give me a hand with the remaining three users
>>> within the amdgpu driver? I don't know if the in_interrupt() check can
>>> be limited to certain callers.
>>> What I noticed while tracing v5.10 is this:
>>>
>>> |             Xorg-2257    [007] d... 57261.620043: amdgpu_device_wreg: 0x699f, 0x00001bcf, 0x00000100
>>> |  => trace_event_raw_event_amdgpu_device_wreg
>>> |  => amdgpu_device_wreg.part.0
>>> |  => dce110_arm_vert_intr
>>> |  => dce110_vblank_set
>>> |  => dm_enable_vblank
>>> |  => drm_vblank_enable
>>> |  => drm_vblank_get
>>> |  => drm_wait_vblank_ioctl
>>> |  => drm_ioctl_kernel
>>> |  => drm_ioctl
>>> |  => amdgpu_drm_ioctl
>>> |  => __x64_sys_ioctl
>>> |  => do_syscall_64
>>> |  => entry_SYSCALL_64_after_hwframe
>>>
>>> I think that amdgpu_device_wreg() -> amdgpu_kiq_wreg() could be invoked.
>>> It doesn't here because amdgpu_sriov_runtime() is false.
>>> The trace says `d' which means interrupts are disabled but
>>> in_interrupt() will return false in this case (no IRQ/softirq).
>>>
>>> Sebastian
> Sebastian

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^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage.
  2021-02-09 12:50 ` [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage Christian König
  2021-02-09 16:53   ` Sebastian Andrzej Siewior
@ 2021-03-11 15:45   ` Alex Deucher
  1 sibling, 0 replies; 10+ messages in thread
From: Alex Deucher @ 2021-03-11 15:45 UTC (permalink / raw)
  To: Christian König
  Cc: David Airlie, Sebastian Andrzej Siewior, amd-gfx list,
	Maling list - DRI developers, Daniel Vetter, Alex Deucher,
	Thomas Gleixner

Applied.  Thanks!

Alex

On Tue, Feb 9, 2021 at 7:50 AM Christian König <christian.koenig@amd.com> wrote:
>
> Reviewed-by: Christian König <christian.koenig@amd.com> for the series.
>
> Am 09.02.21 um 13:44 schrieb Sebastian Andrzej Siewior:
> > Folks,
> >
> > in the discussion about preempt count consistency across kernel
> > configurations:
> >
> >   https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fr%2F20200914204209.256266093%40linutronix.de%2F&amp;data=04%7C01%7Cchristian.koenig%40amd.com%7C66cfb449f0ba475dd76b08d8ccf87a85%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637484714876862283%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=g04sQoqvfkuHzplig%2F%2BOruqzmyypIhaqrkKU0xeIJ80%3D&amp;reserved=0
> >
> > it was concluded that the usage of in_interrupt() and related context
> > checks should be removed from non-core code.
> >
> > In the long run, usage of 'preemptible, in_*irq etc.' should be banned from
> > driver code completely.
> >
> > This series addresses parts of the amdgpu driver.  There are still call sites
> > left in in the amdgpu driver.
> >
> > v1…v2:
> >     - Limit to admgpu only
> >     - use "bool" instead of "bool == true"
> >
> > Sebastian
> >
> >
>
> _______________________________________________
> amd-gfx mailing list
> amd-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
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^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2021-03-11 15:45 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-02-09 12:44 [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage Sebastian Andrzej Siewior
2021-02-09 12:44 ` [PATCH 1/3] drm/amdgpu: Replace in_interrupt() usage in gmc_v*_process_interrupt() Sebastian Andrzej Siewior
2021-02-09 12:44 ` [PATCH 2/3] drm/amdgpu: Remove in_interrupt() usage in gfx_v9_0_kiq_read_clock() Sebastian Andrzej Siewior
2021-02-09 12:44 ` [PATCH 3/3] drm/amdgpu: Replace in_task() in gfx_v8_0_parse_sq_irq() Sebastian Andrzej Siewior
2021-02-09 12:50 ` [PATCH v2 0/3] drm/amdgpu: Remove in_interrupt() usage Christian König
2021-02-09 16:53   ` Sebastian Andrzej Siewior
2021-02-09 17:43     ` Christian König
2021-03-10 17:47       ` Sebastian Andrzej Siewior
2021-03-11 10:42         ` Christian König
2021-03-11 15:45   ` Alex Deucher

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