[PATCH umr 2/2] Avoid using debugfs config data in no_kernel mode

[Tom St Denis]

Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
---
 src/app/print_config.c |  2 +-
 src/lib/discover.c     | 21 ++++++++++++---------
 src/lib/scan_config.c  |  9 +++++++--
 src/umr.h              |  2 +-
 4 files changed, 21 insertions(+), 13 deletions(-)

diff --git a/src/app/print_config.c b/src/app/print_config.c
index 3ad95c0cd12f..051666d52e02 100644
--- a/src/app/print_config.c
+++ b/src/app/print_config.c
@@ -100,6 +100,7 @@ void umr_print_config(struct umr_asic *asic)
 {
 	int r, x;
 
+	printf("\tasic.instance == %d\n\n", asic->instance);
 	printf("\tumr.version == %s\n\n", UMR_BUILD_REV);
 
 	for (r = 0; asic->config.fw[r].name[0]; r++) {
@@ -110,7 +111,6 @@ void umr_print_config(struct umr_asic *asic)
 	}
 	printf("\n");
 
-	printf("\tasic.instance == %d\n\n", asic->instance);
 	if (asic->pci.pdevice) {
 		ppx(vendor_id);
 		ppx(device_id);
diff --git a/src/lib/discover.c b/src/lib/discover.c
index 2faed79334ee..3e0c1f93fccd 100644
--- a/src/lib/discover.c
+++ b/src/lib/discover.c
@@ -128,17 +128,20 @@ struct umr_asic *umr_discover_asic(struct umr_options *options)
 			return NULL;
 		}
 	}
+
 	// try to scan via debugfs
-	asic = calloc(1, sizeof *asic);
-	if (asic) {
-		asic->instance = options->instance;
-		asic->options  = *options;
-		umr_scan_config(asic);
-		if (asic->config.pci.device)
-			trydid = asic->config.pci.device;
-		umr_free_asic(asic);
-		asic = NULL;
+	if (!options->no_kernel) {
+		asic = calloc(1, sizeof *asic);
+		if (asic) {
+			asic->instance = options->instance;
+			asic->options  = *options;
+			if (!umr_scan_config(asic) && asic->config.pci.device)
+				trydid = asic->config.pci.device;
+			umr_free_asic(asic);
+			asic = NULL;
+		}
 	}
+
 	if (trydid < 0) {
 		snprintf(name, sizeof(name)-1, "/sys/kernel/debug/dri/%d/name", options->instance);
 		f = fopen(name, "r");
diff --git a/src/lib/scan_config.c b/src/lib/scan_config.c
index 2d9f0f419557..5d2975f33e34 100644
--- a/src/lib/scan_config.c
+++ b/src/lib/scan_config.c
@@ -77,13 +77,16 @@ static void parse_rev3(struct umr_asic *asic, uint32_t *data, int *r)
 	asic->config.pci.subsystem_vendor = data[(*r)++];
 }
 
-void umr_scan_config(struct umr_asic *asic)
+int umr_scan_config(struct umr_asic *asic)
 {
 	uint32_t data[512];
 	FILE *f;
 	char fname[256];
 	int r;
 
+	if (asic->options.no_kernel)
+		return -1;
+
 	/* process FW block */
 	snprintf(fname, sizeof(fname)-1, "/sys/kernel/debug/dri/%d/amdgpu_firmware_info", asic->instance);
 	f = fopen(fname, "r");
@@ -104,7 +107,7 @@ gca_config:
 	snprintf(fname, sizeof(fname)-1, "/sys/kernel/debug/dri/%d/amdgpu_gca_config", asic->instance);
 	f = fopen(fname, "rb");
 	if (!f)
-		return;
+		return -1;
 	fread(data, 1, sizeof(data), f);
 	fclose(f);
 
@@ -119,5 +122,7 @@ gca_config:
 			break;
 		default:
 			printf("Invalid gca config data header\n");
+			return -1;
 	}
+	return 0;
 }
diff --git a/src/umr.h b/src/umr.h
index 4d63708e1c15..f3d359172d03 100644
--- a/src/umr.h
+++ b/src/umr.h
@@ -508,4 +508,4 @@ int umr_read_vram(struct umr_asic *asic, uint32_t vmid, uint64_t address, uint32
 #define RST     (options.use_colour ? "\x1b[0m" : "")
 
 void umr_bitfield_default(struct umr_asic *asic, char *asicname, char *ipname, char *regname, char *bitname, int start, int stop, uint32_t value);
-void umr_scan_config(struct umr_asic *asic);
+int umr_scan_config(struct umr_asic *asic);
-- 
2.12.0