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SubjectRe: [PATCH RFC tip/core/rcu 3/4] drivers/gpu/drm/amd: Dynamically allocate kfd_processes_srcu
On Tue, Apr 02, 2019 at 05:40:54PM +0000, Kuehling, Felix wrote:
> On 2019-04-02 10:29 a.m., Paul E. McKenney wrote:
> > Having DEFINE_SRCU() or DEFINE_STATIC_SRCU() in a loadable module
> > requires that the size of the reserved region be increased, which is
> > not something we really want to be doing. This commit therefore removes
> > the DEFINE_STATIC_SRCU() from drivers/gpu/drm/amd/amdkfd/kfd_process.c in
> > favor of defining kfd_processes_srcu as a simple srcu_struct, initializing
> > it in amdgpu_amdkfd_init(), and cleaning it up in amdgpu_amdkfd_fini().
> >
> > Reported-by: kbuild test robot <lkp@intel.com>
> > Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
> > Tested-by: kbuild test robot <lkp@intel.com>
> > Cc: Oded Gabbay <oded.gabbay@gmail.com>
> > Cc: Alex Deucher <alexander.deucher@amd.com>
> > Cc: "Christian König" <christian.koenig@amd.com
> > Cc: "David (ChunMing) Zhou" <David1.Zhou@amd.com>
> > Cc: David Airlie <airlied@linux.ie>
> > Cc: Daniel Vetter <daniel@ffwll.ch>
> > Cc: Tejun Heo <tj@kernel.org>
> > Cc: <dri-devel@lists.freedesktop.org>
> > Cc: <amd-gfx@lists.freedesktop.org>
> > ---
> > drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c | 5 +++++
> > drivers/gpu/drm/amd/amdkfd/kfd_process.c | 2 +-
> > 2 files changed, 6 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
> > index fe1d7368c1e6..eadb20dee867 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
> > @@ -28,6 +28,8 @@
> > #include <linux/module.h>
> > #include <linux/dma-buf.h>
> >
> > +extern struct srcu_struct kfd_processes_srcu;
> > +
> > static const unsigned int compute_vmid_bitmap = 0xFF00;
> >
> > /* Total memory size in system memory and all GPU VRAM. Used to
> > @@ -40,6 +42,8 @@ int amdgpu_amdkfd_init(void)
> > struct sysinfo si;
> > int ret;
> >
> > + ret = init_srcu_struct(&kfd_processes_srcu);
> > + WARN_ON(ret);
>
> kfd_processes_srcu only exists if kfd_process.c is compiled in. That
> depends on CONFIG_HSA_AMD. So this should at least move into #ifdef a
> few lines below.
>
> However, it would be cleaner to move this initialization into kfd_init
> in kfd_module.c, or better yet, into kfd_process_create_wq in
> kfd_process.c. Then kfd_process_create_wq should be renamed to something
> more generic, such as kfd_process_init.
>
>
> > si_meminfo(&si);
> > amdgpu_amdkfd_total_mem_size = si.totalram - si.totalhigh;
> > amdgpu_amdkfd_total_mem_size *= si.mem_unit;
> > @@ -57,6 +61,7 @@ int amdgpu_amdkfd_init(void)
> > void amdgpu_amdkfd_fini(void)
> > {
> > kgd2kfd_exit();
> > + cleanup_srcu_struct(&kfd_processes_srcu);
>
> Similarly, this would be cleaner in kfd_exit in kfd_module.c or
> kfd_process_destroy_wq in kfd_process.c, with that function similarly
> renamed to kfd_process_fini.
>
> I'm attaching a revised patch. It's only compile tested.

Thank you, Felix! I have reverted my original and applied your revised
version.

Thanx, Paul

> Regards,
>   Felix
>
>
> > }
> >
> > void amdgpu_amdkfd_device_probe(struct amdgpu_device *adev)
> > diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> > index 4bdae78bab8e..98b694068b8a 100644
> > --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> > +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> > @@ -47,7 +47,7 @@ struct mm_struct;
> > DEFINE_HASHTABLE(kfd_processes_table, KFD_PROCESS_TABLE_SIZE);
> > static DEFINE_MUTEX(kfd_processes_mutex);
> >
> > -DEFINE_SRCU(kfd_processes_srcu);
> > +struct srcu_struct kfd_processes_srcu;
> >
> > /* For process termination handling */
> > static struct workqueue_struct *kfd_process_wq;

> From 5857a9aa63957a5755ff81ae5c46533bca408c12 Mon Sep 17 00:00:00 2001
> From: "Paul E. McKenney" <paulmck@linux.ibm.com>
> Date: Tue, 2 Apr 2019 07:29:32 -0700
> Subject: [PATCH 1/1] drivers/gpu/drm/amd: Dynamically allocate
> kfd_processes_srcu v2
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
>
> Having DEFINE_SRCU() or DEFINE_STATIC_SRCU() in a loadable module
> requires that the size of the reserved region be increased, which is
> not something we really want to be doing. This commit therefore removes
> the DEFINE_STATIC_SRCU() from drivers/gpu/drm/amd/amdkfd/kfd_process.c in
> favor of defining kfd_processes_srcu as a simple srcu_struct, initializing
> it in kfd_process_init(), and cleaning it up in kfd_process_fini().
>
> v2 (Felix Kuehling): Move srcu init and cleanup into kfd_process.c
>
> Reported-by: kbuild test robot <lkp@intel.com>
> Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
> Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
> Tested-by (v1): kbuild test robot <lkp@intel.com>
> Cc: Oded Gabbay <oded.gabbay@gmail.com>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: "Christian K??nig" <christian.koenig@amd.com>
> Cc: "David (ChunMing) Zhou" <David1.Zhou@amd.com>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: Tejun Heo <tj@kernel.org>
> Cc: <dri-devel@lists.freedesktop.org>
> Cc: <amd-gfx@lists.freedesktop.org>
> ---
> drivers/gpu/drm/amd/amdkfd/kfd_module.c | 8 ++++----
> drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 4 ++--
> drivers/gpu/drm/amd/amdkfd/kfd_process.c | 19 ++++++++++++-------
> 3 files changed, 18 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_module.c b/drivers/gpu/drm/amd/amdkfd/kfd_module.c
> index 932007e..e8e2c15 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_module.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_module.c
> @@ -52,15 +52,15 @@ static int kfd_init(void)
> if (err < 0)
> goto err_topology;
>
> - err = kfd_process_create_wq();
> + err = kfd_process_init();
> if (err < 0)
> - goto err_create_wq;
> + goto err_process;
>
> kfd_debugfs_init();
>
> return 0;
>
> -err_create_wq:
> +err_process:
> kfd_topology_shutdown();
> err_topology:
> kfd_chardev_exit();
> @@ -71,7 +71,7 @@ static int kfd_init(void)
> static void kfd_exit(void)
> {
> kfd_debugfs_fini();
> - kfd_process_destroy_wq();
> + kfd_process_fini();
> kfd_topology_shutdown();
> kfd_chardev_exit();
> }
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> index 9e02309..9dd187c 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> @@ -708,8 +708,8 @@ struct amdkfd_ioctl_desc {
> };
> bool kfd_dev_is_large_bar(struct kfd_dev *dev);
>
> -int kfd_process_create_wq(void);
> -void kfd_process_destroy_wq(void);
> +int kfd_process_init(void);
> +void kfd_process_fini(void);
> struct kfd_process *kfd_create_process(struct file *filep);
> struct kfd_process *kfd_get_process(const struct task_struct *);
> struct kfd_process *kfd_lookup_process_by_pasid(unsigned int pasid);
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> index 4bdae78..f810911 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> @@ -47,7 +47,7 @@ struct mm_struct;
> DEFINE_HASHTABLE(kfd_processes_table, KFD_PROCESS_TABLE_SIZE);
> static DEFINE_MUTEX(kfd_processes_mutex);
>
> -DEFINE_SRCU(kfd_processes_srcu);
> +struct srcu_struct kfd_processes_srcu;
>
> /* For process termination handling */
> static struct workqueue_struct *kfd_process_wq;
> @@ -69,22 +69,25 @@ static void evict_process_worker(struct work_struct *work);
> static void restore_process_worker(struct work_struct *work);
>
>
> -int kfd_process_create_wq(void)
> +int kfd_process_init(void)
> {
> + int ret;
> +
> if (!kfd_process_wq)
> kfd_process_wq = alloc_workqueue("kfd_process_wq", 0, 0);
> if (!kfd_restore_wq)
> kfd_restore_wq = alloc_ordered_workqueue("kfd_restore_wq", 0);
>
> - if (!kfd_process_wq || !kfd_restore_wq) {
> - kfd_process_destroy_wq();
> + if (!kfd_process_wq || !kfd_restore_wq)
> return -ENOMEM;
> - }
>
> - return 0;
> + ret = init_srcu_struct(&kfd_processes_srcu);
> + WARN_ON(ret);
> +
> + return ret;
> }
>
> -void kfd_process_destroy_wq(void)
> +void kfd_process_fini(void)
> {
> if (kfd_process_wq) {
> destroy_workqueue(kfd_process_wq);
> @@ -94,6 +97,8 @@ void kfd_process_destroy_wq(void)
> destroy_workqueue(kfd_restore_wq);
> kfd_restore_wq = NULL;
> }
> +
> + cleanup_srcu_struct(&kfd_processes_srcu);
> }
>
> static void kfd_process_free_gpuvm(struct kgd_mem *mem,
> --
> 2.7.4
>

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