/*************************************************************************/ /*!
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@File
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@Title Debug driver main file
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@Copyright Copyright (c) Imagination Technologies Ltd. All Rights Reserved
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@License Dual MIT/GPLv2
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The contents of this file are subject to the MIT license as set out below.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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Alternatively, the contents of this file may be used under the terms of
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the GNU General Public License Version 2 ("GPL") in which case the provisions
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of GPL are applicable instead of those above.
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If you wish to allow use of your version of this file only under the terms of
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GPL, and not to allow others to use your version of this file under the terms
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of the MIT license, indicate your decision by deleting the provisions above
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and replace them with the notice and other provisions required by GPL as set
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out in the file called "GPL-COPYING" included in this distribution. If you do
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not delete the provisions above, a recipient may use your version of this file
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under the terms of either the MIT license or GPL.
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This License is also included in this distribution in the file called
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"MIT-COPYING".
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EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS
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PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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PURPOSE AND NONINFRINGEMENT; AND (B) IN NO EVENT SHALL THE AUTHORS OR
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/ /**************************************************************************/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/kdev_t.h>
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#include <linux/pci.h>
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#include <linux/list.h>
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#include <linux/init.h>
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#include <linux/vmalloc.h>
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#include <linux/uaccess.h>
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#include <drm/drmP.h>
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#include "img_types.h"
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#include "linuxsrv.h"
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#include "dbgdriv_ioctl.h"
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#include "dbgdrvif_srv5.h"
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#include "dbgdriv.h"
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#include "hostfunc.h"
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#include "pvr_debug.h"
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#include "pvrmodule.h"
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#include "pvr_uaccess.h"
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#include "pvr_drm.h"
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#include "pvr_drv.h"
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/* Outward temp buffer used by IOCTL handler allocated once and grows as needed.
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* This optimisation means the debug driver performs less vmallocs/vfrees
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* reducing the chance of kernel vmalloc space exhaustion.
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* Singular out buffer for PDump UM reads is not multi-thread safe and so
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* it now needs a mutex to protect it from multiple simultaneous reads in
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* the future.
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*/
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static IMG_CHAR* g_outTmpBuf = NULL;
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static IMG_UINT32 g_outTmpBufSize = 64*PAGE_SIZE;
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static void* g_pvOutTmpBufMutex = NULL;
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void DBGDrvGetServiceTable(void **fn_table);
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void DBGDrvGetServiceTable(void **fn_table)
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{
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extern DBGKM_SERVICE_TABLE g_sDBGKMServices;
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*fn_table = &g_sDBGKMServices;
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}
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void dbgdrv_cleanup(void)
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{
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if (g_outTmpBuf)
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{
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vfree(g_outTmpBuf);
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g_outTmpBuf = NULL;
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}
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#if defined(SUPPORT_DBGDRV_EVENT_OBJECTS)
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HostDestroyEventObjects();
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#endif
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HostDestroyMutex(g_pvOutTmpBufMutex);
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HostDestroyMutex(g_pvAPIMutex);
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return;
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}
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IMG_INT dbgdrv_init(void)
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{
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/* Init API mutex */
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if ((g_pvAPIMutex=HostCreateMutex()) == NULL)
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{
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return -ENOMEM;
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}
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/* Init TmpBuf mutex */
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if ((g_pvOutTmpBufMutex=HostCreateMutex()) == NULL)
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{
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return -ENOMEM;
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}
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#if defined(SUPPORT_DBGDRV_EVENT_OBJECTS)
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/*
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* The current implementation of HostCreateEventObjects on Linux
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* can never fail, so there is no need to check for error.
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*/
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(void) HostCreateEventObjects();
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#endif
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return 0;
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}
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static IMG_INT dbgdrv_ioctl_work(void *arg, IMG_BOOL bCompat)
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{
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struct drm_pvr_dbgdrv_cmd *psDbgdrvCmd = (struct drm_pvr_dbgdrv_cmd *) arg;
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char *buffer, *in, *out;
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unsigned int cmd;
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void *pBufferIn, *pBufferOut;
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if (psDbgdrvCmd->pad)
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{
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PVR_DPF((PVR_DBG_ERROR, "Invalid pad value\n"));
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return -EINVAL;
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}
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if ((psDbgdrvCmd->in_data_size > (PAGE_SIZE >> 1)) ||
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(psDbgdrvCmd->out_data_size > (PAGE_SIZE >> 1)))
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{
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PVR_DPF((PVR_DBG_ERROR,"Sizes of the buffers are too large, cannot do ioctl\n"));
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return -1;
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}
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buffer = (char *) HostPageablePageAlloc(1);
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if (!buffer)
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{
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PVR_DPF((PVR_DBG_ERROR,"Failed to allocate buffer, cannot do ioctl\n"));
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return -EFAULT;
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}
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in = buffer;
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out = buffer + (PAGE_SIZE >>1);
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pBufferIn = (void *)(uintptr_t) psDbgdrvCmd->in_data_ptr;
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pBufferOut = (void *)(uintptr_t) psDbgdrvCmd->out_data_ptr;
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if (pvr_copy_from_user(in, pBufferIn, psDbgdrvCmd->in_data_size) != 0)
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{
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goto init_failed;
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}
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/* Extra -1 because ioctls start at DEBUG_SERVICE_IOCTL_BASE + 1 */
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cmd = MAKEIOCTLINDEX(psDbgdrvCmd->cmd) - DEBUG_SERVICE_IOCTL_BASE - 1;
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if (psDbgdrvCmd->cmd == DEBUG_SERVICE_READ)
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{
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IMG_UINT32 *pui32BytesCopied = (IMG_UINT32 *)out;
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DBG_OUT_READ *psReadOutParams = (DBG_OUT_READ *)out;
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DBG_IN_READ *psReadInParams = (DBG_IN_READ *)in;
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void *pvOutBuffer;
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PDBG_STREAM psStream;
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psStream = SID2PStream(psReadInParams->hStream);
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if (!psStream)
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{
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goto init_failed;
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}
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/* Serialise IOCTL Read op access to the singular output buffer */
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HostAquireMutex(g_pvOutTmpBufMutex);
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if ((g_outTmpBuf == NULL) || (psReadInParams->ui32OutBufferSize > g_outTmpBufSize))
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{
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if (psReadInParams->ui32OutBufferSize > g_outTmpBufSize)
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{
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g_outTmpBufSize = psReadInParams->ui32OutBufferSize;
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}
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g_outTmpBuf = vmalloc(g_outTmpBufSize);
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if (!g_outTmpBuf)
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{
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HostReleaseMutex(g_pvOutTmpBufMutex);
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goto init_failed;
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}
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}
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/* Ensure only one thread is allowed into the DBGDriv core at a time */
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HostAquireMutex(g_pvAPIMutex);
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psReadOutParams->ui32DataRead = DBGDrivRead(psStream,
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psReadInParams->ui32BufID,
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psReadInParams->ui32OutBufferSize,
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g_outTmpBuf);
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psReadOutParams->ui32SplitMarker = DBGDrivGetMarker(psStream);
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HostReleaseMutex(g_pvAPIMutex);
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pvOutBuffer = WIDEPTR_GET_PTR(psReadInParams->pui8OutBuffer, bCompat);
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if (pvr_copy_to_user(pvOutBuffer,
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g_outTmpBuf,
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*pui32BytesCopied) != 0)
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{
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HostReleaseMutex(g_pvOutTmpBufMutex);
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goto init_failed;
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}
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HostReleaseMutex(g_pvOutTmpBufMutex);
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}
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else
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{
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(g_DBGDrivProc[cmd])(in, out, bCompat);
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}
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if (copy_to_user(pBufferOut, out, psDbgdrvCmd->out_data_size) != 0)
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{
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goto init_failed;
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}
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HostPageablePageFree((void *)buffer);
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return 0;
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init_failed:
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HostPageablePageFree((void *)buffer);
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return -EFAULT;
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}
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int dbgdrv_ioctl(struct drm_device *dev, void *arg, struct drm_file *pFile)
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{
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return dbgdrv_ioctl_work((void *) arg, IMG_FALSE);
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}
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int dbgdrv_ioctl_compat(struct file *file, unsigned int ioctlCmd, unsigned long arg)
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{
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return dbgdrv_ioctl_work((void *) arg, IMG_TRUE);
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}
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EXPORT_SYMBOL(DBGDrvGetServiceTable);
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