Hi will, > -----Original Message----- > From: Will Deacon [mailto:will.deacon@xxxxxxx] > Sent: Tuesday, April 26, 2016 7:47 PM > To: Sricharan R <sricharan@xxxxxxxxxxxxxx> > Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx; > devicetree@xxxxxxxxxxxxxxx; linux-arm-msm@xxxxxxxxxxxxxxx; > robin.murphy@xxxxxxx; robdclark@xxxxxxxxx; joro@xxxxxxxxxx; > srinivas.kandagatla@xxxxxxxxxx; laurent.pinchart@xxxxxxxxxxxxxxxx; > stepanm@xxxxxxxxxxxxxx; treding@xxxxxxxxxx > Subject: Re: [PATCH V2 4/5] iommu/msm: use generic ARMV7S short > descriptor pagetable ops > > On Wed, Apr 06, 2016 at 07:59:34PM +0530, Sricharan R wrote: > > This iommu uses the armv7 short descriptor format. So use the generic > > ARMV7S pagetable ops instead of rewriting the same stuff in the > > driver. > > > > Signed-off-by: Sricharan R <sricharan@xxxxxxxxxxxxxx> > > --- > > drivers/iommu/Kconfig | 1 + > > drivers/iommu/msm_iommu.c | 378 > > ++++++++++------------------------------------ > > 2 files changed, 80 insertions(+), 299 deletions(-) > > Nice diffstat! > > > +static void __flush_iotlb(void *cookie) > > { > > - struct msm_priv *priv = to_msm_priv(domain); > > + struct msm_priv *priv = cookie; > > struct msm_iommu_dev *iommu = NULL; > > struct msm_iommu_ctx_dev *master; > > int ret = 0; > > > > -#ifndef CONFIG_IOMMU_PGTABLES_L2 > > - unsigned long *fl_table = priv->pgtable; > > - int i; > > - > > - if (!list_empty(&priv->list_attached)) { > > - dmac_flush_range(fl_table, fl_table + SZ_16K); > > - > > - for (i = 0; i < NUM_FL_PTE; i++) > > - if ((fl_table[i] & 0x03) == FL_TYPE_TABLE) { > > - void *sl_table = __va(fl_table[i] & > > - > FL_BASE_MASK); > > - dmac_flush_range(sl_table, sl_table + > SZ_4K); > > - } > > - } > > -#endif > > - > > list_for_each_entry(iommu, &priv->list_attached, dom_node) { > > ret = __enable_clocks(iommu); > > if (ret) > > @@ -162,9 +144,26 @@ static int __flush_iotlb(struct iommu_domain > *domain) > > __disable_clocks(iommu); > > } > > fail: > > - return ret; > > + return; > > +} > > + > > +static void __flush_iotlb_range(unsigned long iova, size_t size, > > + size_t granule, bool leaf, void *cookie) { > > + __flush_iotlb(cookie); > > Can you really not do better than this? __flush_iotlb does a TLBIALL afaict, > whereas you have the address range here and > drivers/iommu/msm_iommu_hw-8xxx.h has entries for things like > TLBIVA[A]... > > You might even be able to make SET_CTX_REG use writel_relaxed and stick a > DSB in the sync callback (assuming that's sufficient to complete the > maintenance on your device). > Yes, this is a overkill. I should change this as you have mentioned. Thanks. Regards, Sricharan -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
