Merge "uio: msm_sharedmem: Add a function to release the shared RAM section" (e4340a3e) · Commits · e / devices / android_kernel_sony_msm8998

drivers/uio/msm_sharedmem/msm_sharedmem.c

+31 −1

Original line number	Diff line number	Diff line
		/* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
		/* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 and
		@@ -75,6 +75,24 @@ static int sharedmem_mmap(struct uio_info info, struct vm_area_struct vma)
		return result;
		}

		static void free_shared_ram_perms(u32 client_id, phys_addr_t addr, u32 size)
		{
		int ret;
		u32 source_vmlist[2] = {VMID_HLOS, VMID_MSS_MSA};
		int dest_vmids[1] = {VMID_HLOS};
		int dest_perms[1] = {PERM_READ\|PERM_WRITE\|PERM_EXEC};

		if (client_id != MPSS_RMTS_CLIENT_ID)
		return;

		ret = hyp_assign_phys(addr, size, source_vmlist, 2, dest_vmids,
		dest_perms, 1);
		if (ret != 0) {
		pr_err("hyp_assign_phys failed IPA=0x016%pa size=%u err=%d\n",
		&addr, size, ret);
		}
		}

		/* Setup the shared ram permissions.
		* This function currently supports the mpss client only.
		*/
		@@ -184,6 +202,17 @@ out:
		return ret;
		}

		static void msm_sharedmem_shutdown(struct platform_device *pdev)
		{
		struct uio_info *info = dev_get_drvdata(&pdev->dev);

		phys_addr_t shared_mem_addr = info->mem[0].addr;
		u32 shared_mem_size = info->mem[0].size;

		free_shared_ram_perms(MPSS_RMTS_CLIENT_ID, shared_mem_addr,
		shared_mem_size);
		}

		static int msm_sharedmem_remove(struct platform_device *pdev)
		{
		struct uio_info *info = dev_get_drvdata(&pdev->dev);
		@@ -202,6 +231,7 @@ MODULE_DEVICE_TABLE(of, msm_sharedmem_of_match);
		static struct platform_driver msm_sharedmem_driver = {
		.probe = msm_sharedmem_probe,
		.remove = msm_sharedmem_remove,
		.shutdown = msm_sharedmem_shutdown,
		.driver = {
		.name = DRIVER_NAME,
		.owner = THIS_MODULE,