[PATCH] drm/amd/amdgpu: New debugfs interface for MMIO registers (v2)
Das, Nirmoy
nirmoy.das at amd.com
Wed Aug 25 11:16:46 UTC 2021
On 8/25/2021 1:09 PM, Christian König wrote:
> I suggest to give this command here at least a try (remembered the
> name after a moment):
>
> pahole drivers/gpu/drm/amd/amdgpu/amdgpu.o -C amdgpu_debugfs_regs2_iocdata
>
> It has a rather nifty output with padding holes, byte addresses, cache
> lines etc for your structure.
>
> Christian.
>
> Am 25.08.21 um 13:04 schrieb Tom St Denis:
>> I tested it by forcing bit patterns into the ioctl data and printing
>> it out in the kernel log. I'm not siloed into it one way or the
>> other. I'll just change it to u32.
>>
>> On Wed, Aug 25, 2021 at 7:03 AM Christian König
>> <ckoenig.leichtzumerken at gmail.com
>> <mailto:ckoenig.leichtzumerken at gmail.com>> wrote:
>>
>> Using u8 is ok as well, just make sure that you don't have any
>> hidden padding.
>>
>> Nirmoy had a tool to double check for paddings which I once more
>> forgot the name of.
>>
Yes, pahole. pkg name: dwarves
Nirmoy
>>
>> Christian.
>>
>> Am 25.08.21 um 12:40 schrieb Tom St Denis:
>>> The struct works as is but I'll change them to u32. The offset
>>> is an artefact of the fact this was an IOCTL originally. I'm
>>> working both ends in parallel trying to make the changes at the
>>> same time because I'm only submitting the kernel patch if I've
>>> tested it in userspace.
>>>
>>> I'll send a v4 in a bit this morning....
>>>
>>> Tom
>>>
>>> On Wed, Aug 25, 2021 at 2:35 AM Christian König
>>> <ckoenig.leichtzumerken at gmail.com
>>> <mailto:ckoenig.leichtzumerken at gmail.com>> wrote:
>>>
>>>
>>>
>>> Am 24.08.21 um 15:36 schrieb Tom St Denis:
>>> > This new debugfs interface uses an IOCTL interface in
>>> order to pass
>>> > along state information like SRBM and GRBM bank
>>> switching. This
>>> > new interface also allows a full 32-bit MMIO address range
>>> which
>>> > the previous didn't. With this new design we have room to
>>> grow
>>> > the flexibility of the file as need be.
>>> >
>>> > (v2): Move read/write to .read/.write, fix style, add comment
>>> > for IOCTL data structure
>>> >
>>> > Signed-off-by: Tom St Denis <tom.stdenis at amd.com
>>> <mailto:tom.stdenis at amd.com>>
>>> > ---
>>> > drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 162
>>> ++++++++++++++++++++
>>> > drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.h | 32 ++++
>>> > 2 files changed, 194 insertions(+)
>>> >
>>> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
>>> > index 277128846dd1..8e8f5743c8f5 100644
>>> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
>>> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
>>> > @@ -279,6 +279,156 @@ static ssize_t
>>> amdgpu_debugfs_regs_write(struct file *f, const char __user
>>> *buf,
>>> > return amdgpu_debugfs_process_reg_op(false, f, (char
>>> __user *)buf, size, pos);
>>> > }
>>> >
>>> > +static int amdgpu_debugfs_regs2_open(struct inode *inode,
>>> struct file *file)
>>> > +{
>>> > + struct amdgpu_debugfs_regs2_data *rd;
>>> > +
>>> > + rd = kzalloc(sizeof *rd, GFP_KERNEL);
>>> > + if (!rd)
>>> > + return -ENOMEM;
>>> > + rd->adev = file_inode(file)->i_private;
>>> > + file->private_data = rd;
>>> > +
>>> > + return 0;
>>> > +}
>>> > +
>>> > +static int amdgpu_debugfs_regs2_release(struct inode
>>> *inode, struct file *file)
>>> > +{
>>> > + kfree(file->private_data);
>>> > + return 0;
>>> > +}
>>> > +
>>> > +static ssize_t amdgpu_debugfs_regs2_op(struct file *f,
>>> char __user *buf, size_t size, int write_en)
>>> > +{
>>> > + struct amdgpu_debugfs_regs2_data *rd = f->private_data;
>>> > + struct amdgpu_device *adev = rd->adev;
>>> > + ssize_t result = 0;
>>> > + int r;
>>> > + uint32_t value;
>>> > +
>>> > + if (size & 0x3 || rd->state.offset & 0x3)
>>> > + return -EINVAL;
>>> > +
>>> > + if (rd->state.id.use_grbm) {
>>> > + if (rd->state.id.grbm.se
>>> <https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstate.id.grbm.se%2F&data=04%7C01%7Cnirmoy.das%40amd.com%7Cf02eba2f047347488d5508d967b8bf96%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637654865456597676%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=S7Fz7mMEeVYFqLF0paV%2BDr53Ty2e87lVIWFTvfZTJ%2Bs%3D&reserved=0>
>>> == 0x3FF)
>>> > + rd->state.id.grbm.se
>>> <https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstate.id.grbm.se%2F&data=04%7C01%7Cnirmoy.das%40amd.com%7Cf02eba2f047347488d5508d967b8bf96%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637654865456597676%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=S7Fz7mMEeVYFqLF0paV%2BDr53Ty2e87lVIWFTvfZTJ%2Bs%3D&reserved=0>
>>> = 0xFFFFFFFF;
>>> > + if (rd->state.id.grbm.sh
>>> <https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstate.id.grbm.sh%2F&data=04%7C01%7Cnirmoy.das%40amd.com%7Cf02eba2f047347488d5508d967b8bf96%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637654865456607632%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=iHxDEyZ7lz%2FGOdgSFHGbbAT2NPcQCQR0g58ISQMHGhY%3D&reserved=0>
>>> == 0x3FF)
>>> > + rd->state.id.grbm.sh
>>> <https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstate.id.grbm.sh%2F&data=04%7C01%7Cnirmoy.das%40amd.com%7Cf02eba2f047347488d5508d967b8bf96%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637654865456607632%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=iHxDEyZ7lz%2FGOdgSFHGbbAT2NPcQCQR0g58ISQMHGhY%3D&reserved=0>
>>> = 0xFFFFFFFF;
>>> > + if (rd->state.id.grbm.instance == 0x3FF)
>>> > + rd->state.id.grbm.instance = 0xFFFFFFFF;
>>> > + }
>>> > +
>>> > + r = pm_runtime_get_sync(adev_to_drm(adev)->dev);
>>> > + if (r < 0) {
>>> > + pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
>>> > + return r;
>>> > + }
>>> > +
>>> > + r = amdgpu_virt_enable_access_debugfs(adev);
>>> > + if (r < 0) {
>>> > + pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
>>> > + return r;
>>> > + }
>>> > +
>>> > + if (rd->state.id.use_grbm) {
>>> > + if ((rd->state.id.grbm.sh
>>> <https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstate.id.grbm.sh%2F&data=04%7C01%7Cnirmoy.das%40amd.com%7Cf02eba2f047347488d5508d967b8bf96%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637654865456607632%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=iHxDEyZ7lz%2FGOdgSFHGbbAT2NPcQCQR0g58ISQMHGhY%3D&reserved=0>
>>> != 0xFFFFFFFF && rd->state.id.grbm.sh
>>> <https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstate.id.grbm.sh%2F&data=04%7C01%7Cnirmoy.das%40amd.com%7Cf02eba2f047347488d5508d967b8bf96%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637654865456617591%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=jhS3kKxQAAn18tfFNC7pYnZKEKps4zVXdsX%2FIFLH7a4%3D&reserved=0>
>>> >= adev->gfx.config.max_sh_per_se) ||
>>> > + (rd->state.id.grbm.se
>>> <https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstate.id.grbm.se%2F&data=04%7C01%7Cnirmoy.das%40amd.com%7Cf02eba2f047347488d5508d967b8bf96%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637654865456617591%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=J1WzngpR3KOnPsstL3mpbhltQIp0idV6B22%2BZqZpXoQ%3D&reserved=0>
>>> != 0xFFFFFFFF && rd->state.id.grbm.se
>>> <https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstate.id.grbm.se%2F&data=04%7C01%7Cnirmoy.das%40amd.com%7Cf02eba2f047347488d5508d967b8bf96%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637654865456617591%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=J1WzngpR3KOnPsstL3mpbhltQIp0idV6B22%2BZqZpXoQ%3D&reserved=0>
>>> >= adev->gfx.config.max_shader_engines)) {
>>> > + pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
>>> > + pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
>>> > + amdgpu_virt_disable_access_debugfs(adev);
>>> > + return -EINVAL;
>>> > + }
>>> > + mutex_lock(&adev->grbm_idx_mutex);
>>> > + amdgpu_gfx_select_se_sh(adev,
>>> rd->state.id.grbm.se
>>> <https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstate.id.grbm.se%2F&data=04%7C01%7Cnirmoy.das%40amd.com%7Cf02eba2f047347488d5508d967b8bf96%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637654865456627544%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=mElFqeL4bHf%2FcNlWTVyoxT6VhHnoLKVOCwCpsWiqLkM%3D&reserved=0>,
>>> > + rd->state.id.grbm.sh
>>> <https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstate.id.grbm.sh%2F&data=04%7C01%7Cnirmoy.das%40amd.com%7Cf02eba2f047347488d5508d967b8bf96%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637654865456627544%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=R2jlWr%2BtB%2FKypqHKT36JV%2Fnk2CvO2oLYIspKmfbco58%3D&reserved=0>,
>>> > + rd->state.id.grbm.instance);
>>> > + }
>>> > +
>>> > + if (rd->state.id.use_srbm) {
>>> > + mutex_lock(&adev->srbm_mutex);
>>> > + amdgpu_gfx_select_me_pipe_q(adev,
>>> rd->state.id.srbm.me
>>> <https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstate.id.srbm.me%2F&data=04%7C01%7Cnirmoy.das%40amd.com%7Cf02eba2f047347488d5508d967b8bf96%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637654865456637501%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=v8e4VpGjaYi1LcWVBxTYx7f4v%2BUW9%2F6FTpYvGqygJc0%3D&reserved=0>,
>>> rd->state.id.srbm.pipe,
>>> > + rd->state.id.srbm.queue,
>>> rd->state.id.srbm.vmid);
>>> > + }
>>> > +
>>> > + if (rd->state.id.pg_lock)
>>> > + mutex_lock(&adev->pm.mutex);
>>> > +
>>> > + while (size) {
>>> > + if (!write_en) {
>>> > + value = RREG32(rd->state.offset >> 2);
>>> > + r = put_user(value, (uint32_t *)buf);
>>> > + } else {
>>> > + r = get_user(value, (uint32_t *)buf);
>>> > + if (!r)
>>> > + amdgpu_mm_wreg_mmio_rlc(adev, rd->state.offset >> 2,
>>> value);
>>> > + }
>>> > + if (r) {
>>> > + result = r;
>>> > + goto end;
>>> > + }
>>> > + rd->state.offset += 4;
>>> > + size -= 4;
>>> > + result += 4;
>>> > + buf += 4;
>>> > + }
>>> > +end:
>>> > + if (rd->state.id.use_grbm) {
>>> > + amdgpu_gfx_select_se_sh(adev, 0xffffffff,
>>> 0xffffffff, 0xffffffff);
>>> > + mutex_unlock(&adev->grbm_idx_mutex);
>>> > + }
>>> > +
>>> > + if (rd->state.id.use_srbm) {
>>> > + amdgpu_gfx_select_me_pipe_q(adev, 0, 0, 0, 0);
>>> > + mutex_unlock(&adev->srbm_mutex);
>>> > + }
>>> > +
>>> > + if (rd->state.id.pg_lock)
>>> > + mutex_unlock(&adev->pm.mutex);
>>> > +
>>> > + // in umr (the likely user of this) flags are set
>>> per file operation
>>> > + // which means they're never "unset" explicitly. To
>>> avoid breaking
>>> > + // this convention we unset the flags after each
>>> operation
>>> > + // flags are for a single call (need to be set for
>>> every read/write)
>>> > + rd->state.id.use_grbm = 0;
>>> > + rd->state.id.use_srbm = 0;
>>> > + rd->state.id.pg_lock = 0;
>>> > +
>>> > + pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
>>> > + pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
>>> > +
>>> > + amdgpu_virt_disable_access_debugfs(adev);
>>> > + return result;
>>> > +}
>>> > +
>>> > +static long amdgpu_debugfs_regs2_ioctl(struct file *f,
>>> unsigned int cmd, unsigned long data)
>>> > +{
>>> > + struct amdgpu_debugfs_regs2_data *rd = f->private_data;
>>> > +
>>> > + switch (cmd) {
>>> > + case AMDGPU_DEBUGFS_REGS2_IOC_SET_STATE:
>>> > + if (copy_from_user(&rd->state.id
>>> <https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstate.id%2F&data=04%7C01%7Cnirmoy.das%40amd.com%7Cf02eba2f047347488d5508d967b8bf96%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637654865456637501%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=owOCPq7DugPj8bKIZW%2BPL9O1HXIViFHCq8ZqSkIT4X4%3D&reserved=0>,
>>> (struct amdgpu_debugfs_regs2_iocdata *)data, sizeof
>>> rd->state.id
>>> <https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstate.id%2F&data=04%7C01%7Cnirmoy.das%40amd.com%7Cf02eba2f047347488d5508d967b8bf96%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637654865456637501%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=owOCPq7DugPj8bKIZW%2BPL9O1HXIViFHCq8ZqSkIT4X4%3D&reserved=0>))
>>> > + return -EINVAL;
>>> > + break;
>>> > + default:
>>> > + return -EINVAL;
>>> > + }
>>> > + return 0;
>>> > +}
>>> > +
>>> > +static ssize_t amdgpu_debugfs_regs2_read(struct file *f,
>>> char __user *buf, size_t size, loff_t *pos)
>>> > +{
>>> > + struct amdgpu_debugfs_regs2_data *rd = f->private_data;
>>> > + rd->state.offset = *pos;
>>> > + return amdgpu_debugfs_regs2_op(f, buf, size, 0);
>>> > +}
>>> > +
>>> > +static ssize_t amdgpu_debugfs_regs2_write(struct file *f,
>>> const char __user *buf, size_t size, loff_t *pos)
>>> > +{
>>> > + struct amdgpu_debugfs_regs2_data *rd = f->private_data;
>>> > + rd->state.offset = *pos;
>>> > + return amdgpu_debugfs_regs2_op(f, (char __user
>>> *)buf, size, 1);
>>> > +}
>>> > +
>>> >
>>> > /**
>>> > * amdgpu_debugfs_regs_pcie_read - Read from a PCIE register
>>> > @@ -1091,6 +1241,16 @@ static ssize_t
>>> amdgpu_debugfs_gfxoff_read(struct file *f, char __user *buf,
>>> > return result;
>>> > }
>>> >
>>> > +static const struct file_operations
>>> amdgpu_debugfs_regs2_fops = {
>>> > + .owner = THIS_MODULE,
>>> > + .unlocked_ioctl = amdgpu_debugfs_regs2_ioctl,
>>> > + .read = amdgpu_debugfs_regs2_read,
>>> > + .write = amdgpu_debugfs_regs2_write,
>>> > + .open = amdgpu_debugfs_regs2_open,
>>> > + .release = amdgpu_debugfs_regs2_release,
>>> > + .llseek = default_llseek
>>> > +};
>>> > +
>>> > static const struct file_operations
>>> amdgpu_debugfs_regs_fops = {
>>> > .owner = THIS_MODULE,
>>> > .read = amdgpu_debugfs_regs_read,
>>> > @@ -1148,6 +1308,7 @@ static const struct file_operations
>>> amdgpu_debugfs_gfxoff_fops = {
>>> >
>>> > static const struct file_operations *debugfs_regs[] = {
>>> > &amdgpu_debugfs_regs_fops,
>>> > + &amdgpu_debugfs_regs2_fops,
>>> > &amdgpu_debugfs_regs_didt_fops,
>>> > &amdgpu_debugfs_regs_pcie_fops,
>>> > &amdgpu_debugfs_regs_smc_fops,
>>> > @@ -1160,6 +1321,7 @@ static const struct file_operations
>>> *debugfs_regs[] = {
>>> >
>>> > static const char *debugfs_regs_names[] = {
>>> > "amdgpu_regs",
>>> > + "amdgpu_regs2",
>>> > "amdgpu_regs_didt",
>>> > "amdgpu_regs_pcie",
>>> > "amdgpu_regs_smc",
>>> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.h
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.h
>>> > index 141a8474e24f..ec044df5d428 100644
>>> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.h
>>> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.h
>>> > @@ -22,6 +22,8 @@
>>> > * OTHER DEALINGS IN THE SOFTWARE.
>>> > *
>>> > */
>>> > +#include <linux/ioctl.h>
>>> > +#include <uapi/drm/amdgpu_drm.h>
>>> >
>>> > /*
>>> > * Debugfs
>>> > @@ -38,3 +40,33 @@ void amdgpu_debugfs_fence_init(struct
>>> amdgpu_device *adev);
>>> > void amdgpu_debugfs_firmware_init(struct amdgpu_device
>>> *adev);
>>> > void amdgpu_debugfs_gem_init(struct amdgpu_device *adev);
>>> > int amdgpu_debugfs_wait_dump(struct amdgpu_device *adev);
>>> > +
>>> > +/*
>>> > + * MMIO debugfs IOCTL structure
>>> > + */
>>> > +struct amdgpu_debugfs_regs2_iocdata {
>>> > + __u8 use_srbm, use_grbm, pg_lock;
>>>
>>> You should consider using u32 here as well or add explicitly
>>> padding.
>>>
>>> > + struct {
>>> > + __u32 se, sh, instance;
>>> > + } grbm;
>>> > + struct {
>>> > + __u32 me, pipe, queue, vmid;
>>> > + } srbm;
>>> > +};
>>> > +
>>> > +/*
>>> > + * MMIO debugfs state data (per file* handle)
>>> > + */
>>> > +struct amdgpu_debugfs_regs2_data {
>>> > + struct amdgpu_device *adev;
>>> > + struct {
>>> > + struct amdgpu_debugfs_regs2_iocdata id;
>>> > + __u32 offset;
>>>
>>> What is the offset good for here?
>>>
>>> Regards,
>>> Christian.
>>>
>>> > + } state;
>>> > +};
>>> > +
>>> > +enum AMDGPU_DEBUGFS_REGS2_CMDS {
>>> > + AMDGPU_DEBUGFS_REGS2_CMD_SET_STATE=0,
>>> > +};
>>> > +
>>> > +#define AMDGPU_DEBUGFS_REGS2_IOC_SET_STATE _IOWR(0x20,
>>> AMDGPU_DEBUGFS_REGS2_CMD_SET_STATE, struct
>>> amdgpu_debugfs_regs2_iocdata)
>>>
>>
>
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