[PATCH libdrm] amdgpu: dynamically detect number of drm devices

[Xiaojie.Yuan@xxxxxxx (Xiaojie Yuan)]

Change-Id: I36764951bebbcbf06cf84dd43ee946a34ec7b100
Signed-off-by: Xiaojie Yuan <Xiaojie.Yuan at amd.com>
---
 tests/amdgpu/amdgpu_test.c | 44 ++++++++++++++++++++++++++++----------
 tests/amdgpu/amdgpu_test.h |  7 +-----
 2 files changed, 34 insertions(+), 17 deletions(-)

diff --git a/tests/amdgpu/amdgpu_test.c b/tests/amdgpu/amdgpu_test.c
index 96fcd687..f7ac4ab4 100644
--- a/tests/amdgpu/amdgpu_test.c
+++ b/tests/amdgpu/amdgpu_test.c
@@ -61,7 +61,8 @@
  *  Open handles for amdgpu devices
  *
  */
-int drm_amdgpu[MAX_CARDS_SUPPORTED];
+int *drm_amdgpu;
+size_t num_drm_devices;
 
 /** Open render node to test */
 int open_render_node = 0;	/* By default run most tests on primary node */
@@ -238,16 +239,16 @@ static const char options[]   = "hlrps:t:b:d:f";
  */
 static int amdgpu_open_devices(int open_render_node)
 {
-	drmDevicePtr devices[MAX_CARDS_SUPPORTED];
+	drmDevicePtr *devices;
 	int i;
 	int drm_node;
 	int amd_index = 0;
 	int drm_count;
+	int drm_count2;
 	int fd;
 	drmVersionPtr version;
 
-	drm_count = drmGetDevices2(0, devices, MAX_CARDS_SUPPORTED);
-
+	drm_count = drmGetDevices2(0, NULL, 0);
 	if (drm_count < 0) {
 		fprintf(stderr,
 			"drmGetDevices2() returned an error %d\n",
@@ -255,6 +256,27 @@ static int amdgpu_open_devices(int open_render_node)
 		return 0;
 	}
 
+	devices = calloc(drm_count, sizeof(drmDevicePtr));
+	if (!devices) {
+		goto end;
+	}
+
+	drm_amdgpu = calloc(drm_count, sizeof(int));
+	if (!drm_amdgpu) {
+		goto end;
+	}
+
+	for (i = 0; i < drm_count; i++)
+		drm_amdgpu[i] = -1;
+
+	drm_count2 = drmGetDevices2(0, devices, drm_count);
+	if (drm_count2 != drm_count) {
+		fprintf(stderr, "number of drm devices changed");
+		goto end;
+	}
+
+	num_drm_devices = drm_count;
+
 	for (i = 0; i < drm_count; i++) {
 		/* If this is not PCI device, skip*/
 		if (devices[i]->bustype != DRM_BUS_PCI)
@@ -302,7 +324,9 @@ static int amdgpu_open_devices(int open_render_node)
 		amd_index++;
 	}
 
+end:
 	drmFreeDevices(devices, drm_count);
+	free(devices);
 	return amd_index;
 }
 
@@ -311,9 +335,11 @@ static int amdgpu_open_devices(int open_render_node)
 static void amdgpu_close_devices()
 {
 	int i;
-	for (i = 0; i < MAX_CARDS_SUPPORTED; i++)
+	for (i = 0; i < num_drm_devices; i++)
 		if (drm_amdgpu[i] >=0)
 			close(drm_amdgpu[i]);
+
+	free(drm_amdgpu);
 }
 
 /* Print AMD devices information */
@@ -339,7 +365,7 @@ static void amdgpu_print_devices()
 
 	/* Display information of AMD devices */
 	printf("Devices:\n");
-	for (i = 0; i < MAX_CARDS_SUPPORTED && drm_amdgpu[i] >=0; i++)
+	for (i = 0; i < num_drm_devices && drm_amdgpu[i] >=0; i++)
 		if (drmGetDevice2(drm_amdgpu[i],
 			DRM_DEVICE_GET_PCI_REVISION,
 			&device) == 0) {
@@ -377,7 +403,7 @@ static int amdgpu_find_device(uint8_t bus, uint16_t dev)
 	int i;
 	drmDevicePtr device;
 
-	for (i = 0; i < MAX_CARDS_SUPPORTED && drm_amdgpu[i] >= 0; i++) {
+	for (i = 0; i < num_drm_devices && drm_amdgpu[i] >= 0; i++) {
 		if (drmGetDevice2(drm_amdgpu[i],
 			DRM_DEVICE_GET_PCI_REVISION,
 			&device) == 0) {
@@ -456,10 +482,6 @@ int main(int argc, char **argv)
 	int display_list = 0;
 	int force_run = 0;
 
-	for (i = 0; i < MAX_CARDS_SUPPORTED; i++)
-		drm_amdgpu[i] = -1;
-
-
 	/* Parse command line string */
 	opterr = 0;		/* Do not print error messages from getopt */
 	while ((c = getopt(argc, argv, options)) != -1) {
diff --git a/tests/amdgpu/amdgpu_test.h b/tests/amdgpu/amdgpu_test.h
index 62875736..8a604fe4 100644
--- a/tests/amdgpu/amdgpu_test.h
+++ b/tests/amdgpu/amdgpu_test.h
@@ -27,13 +27,8 @@
 #include "amdgpu.h"
 #include "amdgpu_drm.h"
 
-/**
- * Define max. number of card in system which we are able to handle
- */
-#define MAX_CARDS_SUPPORTED     4
-
 /* Forward reference for array to keep "drm" handles */
-extern int drm_amdgpu[MAX_CARDS_SUPPORTED];
+extern int *drm_amdgpu;
 
 /* Global variables */
 extern int open_render_node;
-- 
2.17.0