RE: [PATCH 07/14] dspbridge: deh: ensure only tlb #0 is enabled

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+Cris
+Stanley
Loop in DSP guys in case they would have something to add.

> -----Original Message-----
> From: Felipe Contreras [mailto:felipe.contreras@xxxxxxxxx]
> Sent: Sunday, May 16, 2010 10:46 AM
> To: linux-omap
> Cc: Ramirez Luna, Omar; Guzman Lugo, Fernando; Felipe Contreras
> Subject: [PATCH 07/14] dspbridge: deh: ensure only tlb #0 is enabled
> 
> We don't want the DSP to continue writing into other mapped pages, no
> matter how unlikely.
> 
> Based on extensive discussion with Fernando Guzman Lugo.
> 
> Signed-off-by: Felipe Contreras <felipe.contreras@xxxxxxxxx>
> ---
>  drivers/dsp/bridge/core/ue_deh.c |    8 ++++++++
>  1 files changed, 8 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/dsp/bridge/core/ue_deh.c
> b/drivers/dsp/bridge/core/ue_deh.c
> index 61e5e4e..f661aaf 100644
> --- a/drivers/dsp/bridge/core/ue_deh.c
> +++ b/drivers/dsp/bridge/core/ue_deh.c
> @@ -235,6 +235,14 @@ void bridge_deh_notify(struct deh_mgr *deh_mgr, u32
> ulEventMask, u32 dwErrInfo)
>  		print_dsp_trace_buffer(dev_context);
>  		dump_dl_modules(dev_context);
> 
> +		/*
> +		 * Before acking the MMU fault, let's make sure MMU can only
> +		 * access entry #0. Then add a new entry so that the DSP OS
> +		 * can continue in order to dump the stack.
> +		 */
> +		hw_mmu_twl_disable(resources->dw_dmmu_base);
> +		hw_mmu_tlb_flush_all(resources->dw_dmmu_base);
> +
>  		hw_mmu_tlb_add(resources->dw_dmmu_base,
>  				virt_to_phys(dummy_va_addr), fault_addr,
>  				HW_PAGE_SIZE4KB, 1,
> --
> 1.7.1

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