linux-kernel - [PATCH v2 9/9] drm/msm: Wire up comm/cmdline override for fdinfo

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Date:   Thu, 27 Apr 2023 10:53:33 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     freedreno@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Christopher Healy <healych@...zon.com>,
        Emil Velikov <emil.l.velikov@...il.com>,
        Christian König <christian.koenig@....com>,
        Rob Clark <robdclark@...omium.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Chia-I Wu <olvaffe@...il.com>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>,
        Luca Weiss <luca@...tu.xyz>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Elliot Berman <quic_eberman@...cinc.com>,
        linux-arm-msm@...r.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 9/9] drm/msm: Wire up comm/cmdline override for fdinfo

From: Rob Clark <robdclark@...omium.org>

Also store the override strings in drm_file so that fdinfo can display
them.  We still need to keep our original copy as we could need these
override strings after the device file has been closed and drm_file
freed.

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 drivers/gpu/drm/msm/adreno/adreno_gpu.c | 24 +++++++++++++++++++++++-
 drivers/gpu/drm/msm/msm_drv.c           |  2 ++
 drivers/gpu/drm/msm/msm_gpu.h           | 10 ++++++++++
 3 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index bb38e728864d..a20c2622a61f 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -16,6 +16,7 @@
 #include <linux/soc/qcom/mdt_loader.h>
 #include <linux/nvmem-consumer.h>
 #include <soc/qcom/ocmem.h>
+#include <drm/drm_file.h>
 #include "adreno_gpu.h"
 #include "a6xx_gpu.h"
 #include "msm_gem.h"
@@ -398,7 +399,8 @@ int adreno_set_param(struct msm_gpu *gpu, struct msm_file_private *ctx,
 	switch (param) {
 	case MSM_PARAM_COMM:
 	case MSM_PARAM_CMDLINE: {
-		char *str, **paramp;
+		char *str, *str2, **paramp;
+		struct drm_file *file = ctx->file;
 
 		str = kmalloc(len + 1, GFP_KERNEL);
 		if (!str)
@@ -412,6 +414,13 @@ int adreno_set_param(struct msm_gpu *gpu, struct msm_file_private *ctx,
 		/* Ensure string is null terminated: */
 		str[len] = '\0';
 
+		/*
+		 * We need a 2nd copy for drm_file.. this copy can't replace
+		 * our internal copy in the ctx, because we may need it for
+		 * recovery/devcoredump after the file is already closed.
+		 */
+		str2 = kstrdup(str, GFP_KERNEL);
+
 		mutex_lock(&gpu->lock);
 
 		if (param == MSM_PARAM_COMM) {
@@ -425,6 +434,19 @@ int adreno_set_param(struct msm_gpu *gpu, struct msm_file_private *ctx,
 
 		mutex_unlock(&gpu->lock);
 
+		mutex_lock(&file->override_lock);
+
+		if (param == MSM_PARAM_COMM) {
+			paramp = &file->override_comm;
+		} else {
+			paramp = &file->override_cmdline;
+		}
+
+		kfree(*paramp);
+		*paramp = str2;
+
+		mutex_unlock(&file->override_lock);
+
 		return 0;
 	}
 	case MSM_PARAM_SYSPROF:
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 81a1371c0307..3a74b5653e96 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -581,6 +581,7 @@ static int context_init(struct drm_device *dev, struct drm_file *file)
 	rwlock_init(&ctx->queuelock);
 
 	kref_init(&ctx->ref);
+	ctx->file = file;
 	msm_submitqueue_init(dev, ctx);
 
 	ctx->aspace = msm_gpu_create_private_address_space(priv->gpu, current);
@@ -603,6 +604,7 @@ static int msm_open(struct drm_device *dev, struct drm_file *file)
 
 static void context_close(struct msm_file_private *ctx)
 {
+	ctx->file = NULL;
 	msm_submitqueue_close(ctx);
 	msm_file_private_put(ctx);
 }
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index 7a4fa1b8655b..671ce89e61b0 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -359,6 +359,16 @@ struct msm_file_private {
 	struct kref ref;
 	int seqno;
 
+	/**
+	 * @file: link back to the associated drm_file
+	 *
+	 * Note that msm_file_private can outlive the drm_file, ie.
+	 * after the drm_file is closed but before jobs submitted have
+	 * been cleaned up.  After the drm_file is closed this will be
+	 * NULL.
+	 */
+	struct drm_file *file;
+
 	/**
 	 * sysprof:
 	 *
-- 
2.39.2