Opening the DRM file (/dev/dri/card%d) triggers all sorts of KMD
work to happen which is not useful if the KMD is hung or not working.
Since --top is the only user of the file currently we simply defer
opening it until --top is invoked.
Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
---
src/app/top.c | 7 +++++++
src/lib/discover.c | 3 +--
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/src/app/top.c b/src/app/top.c
index 364180eb70f6..a4d3aa8e699d 100644
--- a/src/app/top.c
+++ b/src/app/top.c
@@ -933,8 +933,15 @@ void umr_top(struct umr_asic *asic)
time_t tt;
uint64_t ts;
char hostname[64] = { 0 };
+ char fname[64];
pthread_t sensor_thread;
+ // open drm file if not already open
+ if (asic->fd.drm < 0) {
+ snprintf(fname, sizeof(fname)-1, "/dev/dri/card%d", asic->instance);
+ asic->fd.drm = open(fname, O_RDWR);
+ }
+
if (getenv("HOSTNAME")) strcpy(hostname, getenv("HOSTNAME"));
// init stats
diff --git a/src/lib/discover.c b/src/lib/discover.c
index d561efafe4d4..c9c2f74a4818 100644
--- a/src/lib/discover.c
+++ b/src/lib/discover.c
@@ -127,8 +127,7 @@ struct umr_asic *umr_discover_asic(struct umr_options *options)
asic->fd.vram = open(fname, O_RDWR);
snprintf(fname, sizeof(fname)-1, "/sys/kernel/debug/dri/%d/amdgpu_gpr", asic->instance);
asic->fd.gpr = open(fname, O_RDWR);
- snprintf(fname, sizeof(fname)-1, "/dev/dri/card%d", asic->instance);
- asic->fd.drm = open(fname, O_RDWR);
+ asic->fd.drm = -1; // default to closed
// if appending to the fd list remember to update close_asic() and discover_by_did()...
if (options->use_pci) {
--
2.12.0
