drm/amdgpu: Change the virtual_display type from int to char*.

For virtual display feature, as there may be multiple GPUs,
for user could choose whiche GPU need to enable this feature, change
the type of virtual_display from int to char*. The variable will be set
like this virtual_display="xxxx:xx:xx.x;xxxx:xx:xx.x;".
Signed-off-by: NEmily Deng <Emily.Deng@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -92,7 +92,7 @@ extern unsigned amdgpu_cg_mask;
 extern unsigned amdgpu_pg_mask;
 extern char *amdgpu_disable_cu;
 extern int amdgpu_sclk_deep_sleep_en;
-extern int amdgpu_virtual_display;
+extern char *amdgpu_virtual_display;
 
 #define AMDGPU_WAIT_IDLE_TIMEOUT_IN_MS	        3000
 #define AMDGPU_MAX_USEC_TIMEOUT			100000	/* 100 ms */
@@ -2072,6 +2072,7 @@ struct amdgpu_device {
 	atomic_t			gpu_reset_counter;
 
 	/* display */
+	bool				enable_virtual_display;
 	struct amdgpu_mode_info		mode_info;
 	struct work_struct		hotplug_work;
 	struct amdgpu_irq_src		crtc_irq;

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -46,6 +46,7 @@
 #endif
 #include "vi.h"
 #include "bif/bif_4_1_d.h"
+#include <linux/pci.h>
 
 static int amdgpu_debugfs_regs_init(struct amdgpu_device *adev);
 static void amdgpu_debugfs_regs_cleanup(struct amdgpu_device *adev);
@@ -1181,11 +1182,37 @@ int amdgpu_ip_block_version_cmp(struct amdgpu_device *adev,
 	return 1;
 }
 
+static void amdgpu_whether_enable_virtual_display(struct amdgpu_device *adev)
+{
+	adev->enable_virtual_display = false;
+
+	if (amdgpu_virtual_display) {
+		struct drm_device *ddev = adev->ddev;
+		const char *pci_address_name = pci_name(ddev->pdev);
+		char *pciaddstr, *pciaddstr_tmp, *pciaddname;
+
+		pciaddstr = kstrdup(amdgpu_virtual_display, GFP_KERNEL);
+		pciaddstr_tmp = pciaddstr;
+		while ((pciaddname = strsep(&pciaddstr_tmp, ";"))) {
+			if (!strcmp(pci_address_name, pciaddname)) {
+				adev->enable_virtual_display = true;
+				break;
+			}
+		}
+
+		DRM_INFO("virtual display string:%s, %s:virtual_display:%d\n",
+				 amdgpu_virtual_display, pci_address_name,
+				 adev->enable_virtual_display);
+
+		kfree(pciaddstr);
+	}
+}
+
 static int amdgpu_early_init(struct amdgpu_device *adev)
 {
 	int i, r;
 
-	DRM_INFO("virtual display enabled:%d\n", amdgpu_virtual_display);
+	amdgpu_whether_enable_virtual_display(adev);
 
 	switch (adev->asic_type) {
 	case CHIP_TOPAZ:

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

@@ -90,7 +90,7 @@ unsigned amdgpu_pcie_lane_cap = 0;
 unsigned amdgpu_cg_mask = 0xffffffff;
 unsigned amdgpu_pg_mask = 0xffffffff;
 char *amdgpu_disable_cu = NULL;
-int amdgpu_virtual_display = 0;
+char *amdgpu_virtual_display = NULL;
 
 MODULE_PARM_DESC(vramlimit, "Restrict VRAM for testing, in megabytes");
 module_param_named(vramlimit, amdgpu_vram_limit, int, 0600);
@@ -190,8 +190,8 @@ module_param_named(pg_mask, amdgpu_pg_mask, uint, 0444);
 MODULE_PARM_DESC(disable_cu, "Disable CUs (se.sh.cu,...)");
 module_param_named(disable_cu, amdgpu_disable_cu, charp, 0444);
 
-MODULE_PARM_DESC(virtual_display, "enable virtual display (0 = disable virtual display)");
-module_param_named(virtual_display, amdgpu_virtual_display, int, 0444);
+MODULE_PARM_DESC(virtual_display, "Enable virtual display feature (the virtual_display will be set like xxxx:xx:xx.x;xxxx:xx:xx.x)");
+module_param_named(virtual_display, amdgpu_virtual_display, charp, 0444);
 
 static const struct pci_device_id pciidlist[] = {
 #ifdef CONFIG_DRM_AMDGPU_CIK

drivers/gpu/drm/amd/amdgpu/cik.c

@@ -2323,7 +2323,7 @@ static const struct amdgpu_ip_block_version kaveri_ip_blocks_vd[] =
 
 int cik_set_ip_blocks(struct amdgpu_device *adev)
 {
-	if (amdgpu_virtual_display) {
+	if (adev->enable_virtual_display) {
 		switch (adev->asic_type) {
 		case CHIP_BONAIRE:
 			adev->ip_blocks = bonaire_ip_blocks_vd;

drivers/gpu/drm/amd/amdgpu/vi.c

@@ -1441,7 +1441,7 @@ static const struct amdgpu_ip_block_version cz_ip_blocks_vd[] =
 
 int vi_set_ip_blocks(struct amdgpu_device *adev)
 {
-	if (amdgpu_virtual_display) {
+	if (adev->enable_virtual_display) {
 		switch (adev->asic_type) {
 		case CHIP_TOPAZ:
 			adev->ip_blocks = topaz_ip_blocks_vd;