[PATCH v5 3/4] drm/imagination: Improve some logging in error paths

[Alexandru Dadu <alexandru.dadu@imgtec.com>]

From: Matt Coster <matt.coster@imgtec.com>

Add error messages for attempts to map an already mapped firmware
object, unmap an already unmapped firmware object, and provide too few
DMA address slots for the firmware page table.

Signed-off-by: Matt Coster <matt.coster@imgtec.com>
Signed-off-by: Alexandru Dadu <alexandru.dadu@imgtec.com>
Reviewed-by: Alessio Belle <alessio.belle@imgtec.com>
---
 drivers/gpu/drm/imagination/pvr_fw.c      | 6 ++++--
 drivers/gpu/drm/imagination/pvr_vm_mips.c | 7 ++++++-
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/imagination/pvr_fw.c b/drivers/gpu/drm/imagination/pvr_fw.c
index c6c77b152342..4f2b5c4df600 100644
--- a/drivers/gpu/drm/imagination/pvr_fw.c
+++ b/drivers/gpu/drm/imagination/pvr_fw.c
@@ -1165,8 +1165,9 @@ pvr_fw_object_fw_map(struct pvr_device *pvr_dev, struct pvr_fw_object *fw_obj, u
 	spin_lock(&fw_dev->fw_mm_lock);
 
 	if (drm_mm_node_allocated(&fw_obj->fw_mm_node)) {
-		err = -EINVAL;
-		goto err_unlock;
+		spin_unlock(&fw_dev->fw_mm_lock);
+		drm_err(from_pvr_device(pvr_dev), "FW object is already mapped!\n");
+		return -EINVAL;
 	}
 
 	if (!dev_addr) {
@@ -1232,6 +1233,7 @@ pvr_fw_object_fw_unmap(struct pvr_fw_object *fw_obj)
 
 	if (!drm_mm_node_allocated(&fw_obj->fw_mm_node)) {
 		spin_unlock(&fw_dev->fw_mm_lock);
+		drm_err(from_pvr_device(pvr_dev), "FW object is already unmapped!\n");
 		return -EINVAL;
 	}
 
diff --git a/drivers/gpu/drm/imagination/pvr_vm_mips.c b/drivers/gpu/drm/imagination/pvr_vm_mips.c
index 726f900d3582..b74386032e6a 100644
--- a/drivers/gpu/drm/imagination/pvr_vm_mips.c
+++ b/drivers/gpu/drm/imagination/pvr_vm_mips.c
@@ -11,6 +11,7 @@
 #include "pvr_vm_mips.h"
 
 #include <drm/drm_managed.h>
+#include <drm/drm_print.h>
 #include <linux/dma-mapping.h>
 #include <linux/err.h>
 #include <linux/slab.h>
@@ -278,8 +279,12 @@ pvr_vm_get_pt_phys_addrs(struct pvr_device *pvr_dev, u64 *phys_addrs, int max_nu
 	struct pvr_fw_device *fw_dev = &pvr_dev->fw_dev;
 	struct pvr_vm_mips_data *vm_data = fw_dev->processor_data.mips_data.vm_data;
 
-	if (ARRAY_SIZE(vm_data->pt_pages) > max_num_addrs)
+	if (ARRAY_SIZE(vm_data->pt_pages) > max_num_addrs) {
+		drm_err(from_pvr_device(pvr_dev),
+			"Minimum %zu pages required for FW PT, but only %d DMA address slots were provided\n",
+			ARRAY_SIZE(vm_data->pt_pages), max_num_addrs);
 		return -EINVAL;
+	}
 
 	for (u32 page_nr = 0; page_nr < max_num_addrs; page_nr++) {
 		/* Firmware expects 4k pages, but host page size might be different. */

-- 
2.43.0