[PATCH v4] drm/amdgpu: Change the virtual_display type from int to char*.

[Emily Deng]

Replace variable enable_virtual_display and change the type of enable_virtual_display.

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: Emily Deng <Emily.Deng at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h        |  3 ++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 29 ++++++++++++++++++++++++++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c    |  6 +++---
 drivers/gpu/drm/amd/amdgpu/cik.c           |  2 +-
 drivers/gpu/drm/amd/amdgpu/vi.c            |  2 +-
 5 files changed, 35 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index c309eaf..e9e3525 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -93,7 +93,7 @@ extern unsigned amdgpu_pcie_lane_cap;
 extern unsigned amdgpu_cg_mask;
 extern unsigned amdgpu_pg_mask;
 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 */
@@ -2076,6 +2076,7 @@ struct amdgpu_device {
 	atomic_t			gpu_reset_counter;
 
 	/* display */
+	bool				enable_virtual_display;
 	struct amdgpu_mode_info		mode_info;
 	/* For pre-DCE11. DCE11 and later are in "struct amdgpu_device->dm" */
 	struct work_struct		hotplug_work;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 68cce12..5376361 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -47,6 +47,7 @@
 #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);
@@ -1182,11 +1183,37 @@ 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:
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 7007cf7..209a539 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -90,7 +90,7 @@ unsigned amdgpu_pcie_gen_cap = 0;
 unsigned amdgpu_pcie_lane_cap = 0;
 unsigned amdgpu_cg_mask = 0xffffffff;
 unsigned amdgpu_pg_mask = 0xffffffff;
-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(cg_mask, amdgpu_cg_mask, uint, 0444);
 MODULE_PARM_DESC(pg_mask, "Powergating flags mask (0 = disable power gating)");
 module_param_named(pg_mask, amdgpu_pg_mask, uint, 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
diff --git a/drivers/gpu/drm/amd/amdgpu/cik.c b/drivers/gpu/drm/amd/amdgpu/cik.c
index 84caa3f..a9fc2bb 100644
--- a/drivers/gpu/drm/amd/amdgpu/cik.c
+++ b/drivers/gpu/drm/amd/amdgpu/cik.c
@@ -2464,7 +2464,7 @@ 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) {
 		amdgpu_dal = 0;
 		switch (adev->asic_type) {
 		case CHIP_BONAIRE:
diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c b/drivers/gpu/drm/amd/amdgpu/vi.c
index 224e8a0..b9da2c7 100644
--- a/drivers/gpu/drm/amd/amdgpu/vi.c
+++ b/drivers/gpu/drm/amd/amdgpu/vi.c
@@ -1730,7 +1730,7 @@ static const struct amdgpu_ip_block_version fiji_ip_blocks_dal[] =
 
 int vi_set_ip_blocks(struct amdgpu_device *adev)
 {
-	if (amdgpu_virtual_display) {
+	if (adev->enable_virtual_display) {
 		amdgpu_dal = 0;
 		switch (adev->asic_type) {
 		case CHIP_TOPAZ:
-- 
1.9.1