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WORKAROUND: misc: fastrpc: flush IOMMU TLB after releasing DSP process #1164

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WORKAROUND: misc: fastrpc: flush IOMMU TLB after releasing DSP process #1164

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8 changes: 8 additions & 0 deletions drivers/misc/fastrpc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,7 @@
#include <uapi/misc/fastrpc.h>
#include <linux/of_reserved_mem.h>
#include <linux/bits.h>
#include <linux/iommu.h>

#define ADSP_DOMAIN_ID (0)
#define MDSP_DOMAIN_ID (1)
Expand Down Expand Up @@ -1585,6 +1586,13 @@ static int fastrpc_device_release(struct inode *inode, struct file *file)
unsigned long flags;

fastrpc_release_current_dsp_process(fl);
if (fl->sctx && fl->sctx->dev) {
struct iommu_domain *domain =
iommu_get_domain_for_dev(fl->sctx->dev);

if (domain)
iommu_flush_iotlb_all(domain);
}

spin_lock_irqsave(&cctx->lock, flags);
list_del(&fl->user);
Expand Down