linux-kernel - Re: [PATCH 1/9] dspbridge: replace iommu custom for opensource implementation

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Message-Id: <20100702.093205.59662898.Hiroshi.DOYU@nokia.com>
Date:	Fri, 02 Jul 2010 09:32:05 +0300 (EEST)
From:	Hiroshi DOYU <Hiroshi.DOYU@...ia.com>
To:	x0095840@...com
Cc:	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	ohad@...ery.com, ameya.palande@...ia.com,
	felipe.contreras@...ia.com
Subject: Re: [PATCH 1/9] dspbridge: replace iommu custom for opensource
 implementation

Hi Fernando,

From: ext Fernando Guzman Lugo <x0095840@...com>
Subject: [PATCH 1/9] dspbridge: replace iommu custom for opensource implementation
Date: Thu, 1 Jul 2010 02:20:52 +0200

> This patch replace the call to custom dsp mmu implemenation
> for the once on iommu module.
> 
> Signed-off-by: Fernando Guzman Lugo <x0095840@...com>
> ---
>  drivers/dsp/bridge/core/_tiomap.h    |   16 +
>  drivers/dsp/bridge/core/io_sm.c      |  114 ++------
>  drivers/dsp/bridge/core/tiomap3430.c |  501 +++++-----------------------------
>  drivers/dsp/bridge/core/ue_deh.c     |   10 -
>  4 files changed, 118 insertions(+), 523 deletions(-)
> 
> diff --git a/drivers/dsp/bridge/core/_tiomap.h b/drivers/dsp/bridge/core/_tiomap.h
> index bf0164e..d13677a 100644
> --- a/drivers/dsp/bridge/core/_tiomap.h
> +++ b/drivers/dsp/bridge/core/_tiomap.h
> @@ -23,6 +23,8 @@
>  #include <plat/clockdomain.h>
>  #include <mach-omap2/prm-regbits-34xx.h>
>  #include <mach-omap2/cm-regbits-34xx.h>
> +#include <plat/iommu.h>
> +#include <plat/iovmm.h>
>  #include <dspbridge/devdefs.h>
>  #include <hw_defs.h>
>  #include <dspbridge/dspioctl.h>        /* for bridge_ioctl_extproc defn */
> @@ -330,6 +332,7 @@ struct bridge_dev_context {
>         u32 dw_internal_size;   /* Internal memory size */
> 
>         struct omap_mbox *mbox;         /* Mail box handle */
> +       struct iommu *dsp_mmu;          /* iommu for iva2 handler */
> 
>         struct cfg_hostres *resources;  /* Host Resources */
> 
> @@ -374,4 +377,17 @@ extern s32 dsp_debug;
>   */
>  int sm_interrupt_dsp(struct bridge_dev_context *dev_context, u16 mb_val);
> 
> +static inline void dsp_iotlb_init(struct iotlb_entry *e, u32 da, u32 pa,
> +                                                       u32 pgsz)
> +{
> +       e->da = da;
> +       e->pa = pa;
> +       e->valid = 1;
> +       e->prsvd = 1;
> +       e->pgsz = pgsz & MMU_CAM_PGSZ_MASK;
> +       e->endian = MMU_RAM_ENDIAN_LITTLE;
> +       e->elsz = MMU_RAM_ELSZ_32;
> +       e->mixed = 0;
> +}
> +
>  #endif /* _TIOMAP_ */
> diff --git a/drivers/dsp/bridge/core/io_sm.c b/drivers/dsp/bridge/core/io_sm.c
> index 7fb840d..1f47f8b 100644
> --- a/drivers/dsp/bridge/core/io_sm.c
> +++ b/drivers/dsp/bridge/core/io_sm.c
> @@ -290,6 +290,8 @@ int bridge_io_on_loaded(struct io_mgr *hio_mgr)
>         struct cod_manager *cod_man;
>         struct chnl_mgr *hchnl_mgr;
>         struct msg_mgr *hmsg_mgr;
> +       struct iommu *mmu;
> +       struct iotlb_entry e;
>         u32 ul_shm_base;
>         u32 ul_shm_base_offset;
>         u32 ul_shm_limit;
> @@ -312,7 +314,6 @@ int bridge_io_on_loaded(struct io_mgr *hio_mgr)
>         struct bridge_ioctl_extproc ae_proc[BRDIOCTL_NUMOFMMUTLB];
>         struct cfg_hostres *host_res;
>         struct bridge_dev_context *pbridge_context;
> -       u32 map_attrs;
>         u32 shm0_end;
>         u32 ul_dyn_ext_base;
>         u32 ul_seg1_size = 0;
> @@ -336,6 +337,21 @@ int bridge_io_on_loaded(struct io_mgr *hio_mgr)
>                 status = -EFAULT;
>                 goto func_end;
>         }
> +
> +       mmu = pbridge_context->dsp_mmu;
> +
> +       if (mmu)
> +               iommu_put(mmu);
> +       mmu = iommu_get("iva2");

+       mmu = iommu_get("iva2", mmu_fault_isr);

I'm considering that it might be better to pass a mmu fault callback
at this iommu_get.

What do you think?
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