[PATCH 0/3] drm/msm: Fix gpu recovery path

[PATCH 0/3] drm/msm: Fix gpu recovery path

[Sharat Masetty]

A few fixes for issues that I have seen in recovery path. The fix in lib/string
is probably not needed anymore with the fixes in drm/msm, but I added it here
nonetheless as it is good to have.

Sharat Masetty (3):
  lib/string: Pass the input gfp flags to kmalloc
  drm/msm: Check if target supports crash dump capture
  drm/msm: Fix task dump in gpu recovery

 drivers/gpu/drm/msm/msm_gpu.c | 13 ++++++++-----
 lib/string_helpers.c          |  4 ++--
 2 files changed, 10 insertions(+), 7 deletions(-)

--
1.9.1

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[PATCH 1/3] lib/string: Pass the input gfp flags to kmalloc

[Sharat Masetty]

Pass the user sent gfp flags to kmalloc() calls. This helps calling the
functions in user desired contexts.

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
---
 lib/string_helpers.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index 29c490e..60f9015 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -576,7 +576,7 @@ char *kstrdup_quotable_cmdline(struct task_struct *task, gfp_t gfp)
 	char *buffer, *quoted;
 	int i, res;
 
-	buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
+	buffer = kmalloc(PAGE_SIZE, gfp);
 	if (!buffer)
 		return NULL;
 
@@ -612,7 +612,7 @@ char *kstrdup_quotable_file(struct file *file, gfp_t gfp)
 		return kstrdup("<unknown>", gfp);
 
 	/* We add 11 spaces for ' (deleted)' to be appended */
-	temp = kmalloc(PATH_MAX + 11, GFP_KERNEL);
+	temp = kmalloc(PATH_MAX + 11, gfp);
 	if (!temp)
 		return kstrdup("<no_memory>", gfp);
 
-- 
1.9.1

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Re: [PATCH 1/3] lib/string: Pass the input gfp flags to kmalloc

[Rob Clark]

Thanks, I've pushed 2 and 3 to msm-next, since these should probably
go in a -fixes pr for 4.20

This one, you might want to resend w/
--cc-cmd=./scripts/get_maintainer.pl so that it gets seen by someone
who could apply it

fwiw, I use

  git config sendemail.cccmd './scripts/get_maintainer.pl -i'

to make that automatic, but to give me a way to edit the list of cc's
that get_maintainer.pl adds

BR,
-R

On Fri, Oct 12, 2018 at 4:57 AM Sharat Masetty <smasetty@codeaurora.org> wrote:
>
> Pass the user sent gfp flags to kmalloc() calls. This helps calling the
> functions in user desired contexts.
>
> Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
> ---
>  lib/string_helpers.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/lib/string_helpers.c b/lib/string_helpers.c
> index 29c490e..60f9015 100644
> --- a/lib/string_helpers.c
> +++ b/lib/string_helpers.c
> @@ -576,7 +576,7 @@ char *kstrdup_quotable_cmdline(struct task_struct *task, gfp_t gfp)
>         char *buffer, *quoted;
>         int i, res;
>
> -       buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
> +       buffer = kmalloc(PAGE_SIZE, gfp);
>         if (!buffer)
>                 return NULL;
>
> @@ -612,7 +612,7 @@ char *kstrdup_quotable_file(struct file *file, gfp_t gfp)
>                 return kstrdup("<unknown>", gfp);
>
>         /* We add 11 spaces for ' (deleted)' to be appended */
> -       temp = kmalloc(PATH_MAX + 11, GFP_KERNEL);
> +       temp = kmalloc(PATH_MAX + 11, gfp);
>         if (!temp)
>                 return kstrdup("<no_memory>", gfp);
>
> --
> 1.9.1
>
> _______________________________________________
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> Freedreno@lists.freedesktop.org
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[PATCH 2/3] drm/msm: Check if target supports crash dump capture

[Sharat Masetty]

This patch simply checks first to see if the target can support crash dump
capture before proceeding.

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
---
 drivers/gpu/drm/msm/msm_gpu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 19b4afe..da63d3d 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -345,6 +345,10 @@ static void msm_gpu_crashstate_capture(struct msm_gpu *gpu,
 {
 	struct msm_gpu_state *state;
 
+	/* Check if the target supports capturing crash state */
+	if (!gpu->funcs->gpu_state_get)
+		return;
+
 	/* Only save one crash state at a time */
 	if (gpu->crashstate)
 		return;
-- 
1.9.1

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[PATCH 3/3] drm/msm: Fix task dump in gpu recovery

[Sharat Masetty]

The current recovery code gets a pointer to the task struct and does a
few things all within the rcu_read_lock. This puts constraints on the
types of gfp flags that can be used within the rcu lock. This patch
instead gets a reference to the task within the rcu lock and releases
the lock immediately, this way the task stays afloat until we need it and
we also get to use the desired gfp flags.

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
---
 drivers/gpu/drm/msm/msm_gpu.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index da63d3d..ca573f6 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -438,10 +438,9 @@ static void recover_worker(struct work_struct *work)
 	if (submit) {
 		struct task_struct *task;
 
-		rcu_read_lock();
-		task = pid_task(submit->pid, PIDTYPE_PID);
+		task = get_pid_task(submit->pid, PIDTYPE_PID);
 		if (task) {
-			comm = kstrdup(task->comm, GFP_ATOMIC);
+			comm = kstrdup(task->comm, GFP_KERNEL);
 
 			/*
 			 * So slightly annoying, in other paths like
@@ -454,10 +453,10 @@ static void recover_worker(struct work_struct *work)
 			 * about the submit going away.
 			 */
 			mutex_unlock(&dev->struct_mutex);
-			cmd = kstrdup_quotable_cmdline(task, GFP_ATOMIC);
+			cmd = kstrdup_quotable_cmdline(task, GFP_KERNEL);
+			put_task_struct(task);
 			mutex_lock(&dev->struct_mutex);
 		}
-		rcu_read_unlock();
 
 		if (comm && cmd) {
 			dev_err(dev->dev, "%s: offending task: %s (%s)\n",
-- 
1.9.1

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