diff options
| author | Anant Goel <anantg@codeaurora.org> | 2018-06-14 18:32:16 -0700 |
|---|---|---|
| committer | Anant Goel <anantg@codeaurora.org> | 2018-06-15 12:19:56 -0700 |
| commit | 205812e0fc6eafbc66489a8444658289992d9166 (patch) | |
| tree | 34cd6b068fc6fca4914d05615126946a819073bb /drivers/uio | |
| parent | 53c73b71906f5ce07686603d9ff7fb20a06d296e (diff) | |
uio: msm_sharedmem: Add a function to release the shared RAM section
A function to free the shared RAM section has been added to the
msm_sharedmem driver. This function is needed to free the RAM section
on shutdown of the msm_sharedmem driver. The function is called on
the shutdown command for the driver.
Change-Id: Iff04f93d380664c5e3df9b0cd575cf9e6300ea39
Signed-off-by: Anant Goel <anantg@codeaurora.org>
Diffstat (limited to 'drivers/uio')
| -rw-r--r-- | drivers/uio/msm_sharedmem/msm_sharedmem.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/drivers/uio/msm_sharedmem/msm_sharedmem.c b/drivers/uio/msm_sharedmem/msm_sharedmem.c index b10c40b3e1fc..84623c9b41d3 100644 --- a/drivers/uio/msm_sharedmem/msm_sharedmem.c +++ b/drivers/uio/msm_sharedmem/msm_sharedmem.c @@ -1,4 +1,4 @@ -/* 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, |