drm/tegra: falcon: Clarify address usage

Rename paddr -> iova and vaddr -> virt to make it clearer how these
addresses are used. This is important for a subsequent patch that makes
a distinction between the physical address (physical address of the
system memory from the CPU's point of view) and the IOVA (physical
address of the system memory from the device's point of view).
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/falcon.c

@@ -58,17 +58,17 @@ static int falcon_copy_chunk(struct falcon *falcon,
 static void falcon_copy_firmware_image(struct falcon *falcon,
 				       const struct firmware *firmware)
 {
-	u32 *firmware_vaddr = falcon->firmware.vaddr;
+	u32 *virt = falcon->firmware.virt;
 	size_t i;
 
 	/* copy the whole thing taking into account endianness */
 	for (i = 0; i < firmware->size / sizeof(u32); i++)
-		firmware_vaddr[i] = le32_to_cpu(((u32 *)firmware->data)[i]);
+		virt[i] = le32_to_cpu(((u32 *)firmware->data)[i]);
 }
 
 static int falcon_parse_firmware_image(struct falcon *falcon)
 {
-	struct falcon_fw_bin_header_v1 *bin = (void *)falcon->firmware.vaddr;
+	struct falcon_fw_bin_header_v1 *bin = (void *)falcon->firmware.virt;
 	struct falcon_fw_os_header_v1 *os;
 
 	/* endian problems would show up right here */
@@ -89,7 +89,7 @@ static int falcon_parse_firmware_image(struct falcon *falcon)
 		return -EINVAL;
 	}
 
-	os = falcon->firmware.vaddr + bin->os_header_offset;
+	os = falcon->firmware.virt + bin->os_header_offset;
 
 	falcon->firmware.bin_data.size = bin->os_size;
 	falcon->firmware.bin_data.offset = bin->os_data_offset;
@@ -138,7 +138,7 @@ int falcon_load_firmware(struct falcon *falcon)
 
 int falcon_init(struct falcon *falcon)
 {
-	falcon->firmware.vaddr = NULL;
+	falcon->firmware.virt = NULL;
 
 	return 0;
 }
@@ -155,7 +155,7 @@ int falcon_boot(struct falcon *falcon)
 	u32 value;
 	int err;
 
-	if (!falcon->firmware.vaddr)
+	if (!falcon->firmware.virt)
 		return -EINVAL;
 
 	err = readl_poll_timeout(falcon->regs + FALCON_DMACTL, value,
@@ -168,7 +168,7 @@ int falcon_boot(struct falcon *falcon)
 	falcon_writel(falcon, 0, FALCON_DMACTL);
 
 	/* setup the address of the binary data so Falcon can access it later */
-	falcon_writel(falcon, (falcon->firmware.paddr +
+	falcon_writel(falcon, (falcon->firmware.iova +
 			       falcon->firmware.bin_data.offset) >> 8,
 		      FALCON_DMATRFBASE);
 

drivers/gpu/drm/tegra/falcon.h

@@ -84,8 +84,9 @@ struct falcon_firmware {
 	const struct firmware *firmware;
 
 	/* Raw firmware data */
-	dma_addr_t paddr;
-	void *vaddr;
+	dma_addr_t iova;
+	dma_addr_t phys;
+	void *virt;
 	size_t size;
 
 	/* Parsed firmware information */

drivers/gpu/drm/tegra/vic.c

@@ -133,9 +133,9 @@ static int vic_boot(struct vic *vic)
 	if (err < 0)
 		return err;
 
-	hdr = vic->falcon.firmware.vaddr;
+	hdr = vic->falcon.firmware.virt;
 	fce_bin_data_offset = *(u32 *)(hdr + VIC_UCODE_FCE_DATA_OFFSET);
-	hdr = vic->falcon.firmware.vaddr +
+	hdr = vic->falcon.firmware.virt +
 		*(u32 *)(hdr + VIC_UCODE_FCE_HEADER_OFFSET);
 	fce_ucode_size = *(u32 *)(hdr + FCE_UCODE_SIZE_OFFSET);
 
@@ -143,7 +143,7 @@ static int vic_boot(struct vic *vic)
 	falcon_execute_method(&vic->falcon, VIC_SET_FCE_UCODE_SIZE,
 			      fce_ucode_size);
 	falcon_execute_method(&vic->falcon, VIC_SET_FCE_UCODE_OFFSET,
-			      (vic->falcon.firmware.paddr + fce_bin_data_offset)
+			      (vic->falcon.firmware.iova + fce_bin_data_offset)
 				>> 8);
 
 	err = falcon_wait_idle(&vic->falcon);
@@ -225,14 +225,17 @@ static int vic_exit(struct host1x_client *client)
 	host1x_channel_put(vic->channel);
 	host1x_client_iommu_detach(client);
 
-	if (client->group)
+	if (client->group) {
+		dma_unmap_single(vic->dev, vic->falcon.firmware.phys,
+				 vic->falcon.firmware.size, DMA_TO_DEVICE);
 		tegra_drm_free(tegra, vic->falcon.firmware.size,
-			       vic->falcon.firmware.vaddr,
-			       vic->falcon.firmware.paddr);
-	else
+			       vic->falcon.firmware.virt,
+			       vic->falcon.firmware.iova);
+	} else {
 		dma_free_coherent(vic->dev, vic->falcon.firmware.size,
-				  vic->falcon.firmware.vaddr,
-				  vic->falcon.firmware.paddr);
+				  vic->falcon.firmware.virt,
+				  vic->falcon.firmware.iova);
+	}
 
 	return 0;
 }
@@ -246,12 +249,12 @@ static int vic_load_firmware(struct vic *vic)
 {
 	struct host1x_client *client = &vic->client.base;
 	struct tegra_drm *tegra = vic->client.drm;
-	dma_addr_t phys;
+	dma_addr_t iova;
 	size_t size;
 	void *virt;
 	int err;
 
-	if (vic->falcon.firmware.vaddr)
+	if (vic->falcon.firmware.virt)
 		return 0;
 
 	err = falcon_read_firmware(&vic->falcon, vic->config->firmware);
@@ -261,17 +264,17 @@ static int vic_load_firmware(struct vic *vic)
 	size = vic->falcon.firmware.size;
 
 	if (!client->group) {
-		virt = dma_alloc_coherent(vic->dev, size, &phys, GFP_KERNEL);
+		virt = dma_alloc_coherent(vic->dev, size, &iova, GFP_KERNEL);
 
-		err = dma_mapping_error(vic->dev, phys);
+		err = dma_mapping_error(vic->dev, iova);
 		if (err < 0)
 			return err;
 	} else {
-		virt = tegra_drm_alloc(tegra, size, &phys);
+		virt = tegra_drm_alloc(tegra, size, &iova);
 	}
 
-	vic->falcon.firmware.vaddr = virt;
-	vic->falcon.firmware.paddr = phys;
+	vic->falcon.firmware.virt = virt;
+	vic->falcon.firmware.iova = iova;
 
 	err = falcon_load_firmware(&vic->falcon);
 	if (err < 0)
@@ -283,35 +286,24 @@ static int vic_load_firmware(struct vic *vic)
 	 * knows what memory pages to flush the cache for.
 	 */
 	if (client->group) {
+		dma_addr_t phys;
+
 		phys = dma_map_single(vic->dev, virt, size, DMA_TO_DEVICE);
 
 		err = dma_mapping_error(vic->dev, phys);
 		if (err < 0)
 			goto cleanup;
 
-		/*
-		 * If the DMA API mapped this through a bounce buffer, the
-		 * dma_sync_single_for_device() call below will not be able
-		 * to flush the caches for the right memory pages. Output a
-		 * big warning in that case so that the DMA mask can be set
-		 * properly and the bounce buffer avoided.
-		 */
-		WARN(phys != vic->falcon.firmware.paddr,
-		     "check DMA mask setting for %s\n", dev_name(vic->dev));
+		vic->falcon.firmware.phys = phys;
 	}
 
-	dma_sync_single_for_device(vic->dev, phys, size, DMA_TO_DEVICE);
-
-	if (client->group)
-		dma_unmap_single(vic->dev, phys, size, DMA_TO_DEVICE);
-
 	return 0;
 
 cleanup:
 	if (!client->group)
-		dma_free_coherent(vic->dev, size, virt, phys);
+		dma_free_coherent(vic->dev, size, virt, iova);
 	else
-		tegra_drm_free(tegra, size, virt, phys);
+		tegra_drm_free(tegra, size, virt, iova);
 
 	return err;
 }