From be6d8026a276e35cce1a2effaf5cd8bf6bd04814 Mon Sep 17 00:00:00 2001 From: "Kanigeri, Hari" Date: Thu, 22 Apr 2010 23:26:11 +0000 Subject: [PATCH] omap iommu: add TLB preservation support This patch adds TLB preservation support to IOMMU module Signed-off-by: Hari Kanigeri Signed-off-by: Hiroshi DOYU --- arch/arm/mach-omap2/iommu2.c | 4 +++- arch/arm/plat-omap/iommu.c | 43 ++++++++++++++++++++++-------------- 2 files changed, 29 insertions(+), 18 deletions(-) diff --git a/arch/arm/mach-omap2/iommu2.c b/arch/arm/mach-omap2/iommu2.c index d29ebff6fde3..e82da680d908 100644 --- a/arch/arm/mach-omap2/iommu2.c +++ b/arch/arm/mach-omap2/iommu2.c @@ -147,6 +147,7 @@ static u32 omap2_iommu_fault_isr(struct iommu *obj, u32 *ra) printk("\n"); iommu_write_reg(obj, stat, MMU_IRQSTATUS); + omap2_iommu_disable(obj); return stat; } @@ -212,7 +213,8 @@ static ssize_t omap2_dump_cr(struct iommu *obj, struct cr_regs *cr, char *buf) char *p = buf; /* FIXME: Need more detail analysis of cam/ram */ - p += sprintf(p, "%08x %08x\n", cr->cam, cr->ram); + p += sprintf(p, "%08x %08x %01x\n", cr->cam, cr->ram, + (cr->cam & MMU_CAM_P) ? 1 : 0); return p - buf; } diff --git a/arch/arm/plat-omap/iommu.c b/arch/arm/plat-omap/iommu.c index 0e137663349c..1e83facb6b77 100644 --- a/arch/arm/plat-omap/iommu.c +++ b/arch/arm/plat-omap/iommu.c @@ -172,15 +172,12 @@ static void iotlb_lock_get(struct iommu *obj, struct iotlb_lock *l) l->base = MMU_LOCK_BASE(val); l->vict = MMU_LOCK_VICT(val); - BUG_ON(l->base != 0); /* Currently no preservation is used */ } static void iotlb_lock_set(struct iommu *obj, struct iotlb_lock *l) { u32 val; - BUG_ON(l->base != 0); /* Currently no preservation is used */ - val = (l->base << MMU_LOCK_BASE_SHIFT); val |= (l->vict << MMU_LOCK_VICT_SHIFT); @@ -231,22 +228,32 @@ int load_iotlb_entry(struct iommu *obj, struct iotlb_entry *e) clk_enable(obj->clk); - for (i = 0; i < obj->nr_tlb_entries; i++) { - struct cr_regs tmp; - - iotlb_lock_get(obj, &l); - l.vict = i; - iotlb_lock_set(obj, &l); - iotlb_read_cr(obj, &tmp); - if (!iotlb_cr_valid(&tmp)) - break; - } - - if (i == obj->nr_tlb_entries) { - dev_dbg(obj->dev, "%s: full: no entry\n", __func__); + iotlb_lock_get(obj, &l); + if (l.base == obj->nr_tlb_entries) { + dev_warn(obj->dev, "%s: preserve entries full\n", __func__); err = -EBUSY; goto out; } + if (!e->prsvd) { + for (i = l.base; i < obj->nr_tlb_entries; i++) { + struct cr_regs tmp; + + iotlb_lock_get(obj, &l); + l.vict = i; + iotlb_lock_set(obj, &l); + iotlb_read_cr(obj, &tmp); + if (!iotlb_cr_valid(&tmp)) + break; + } + if (i == obj->nr_tlb_entries) { + dev_dbg(obj->dev, "%s: full: no entry\n", __func__); + err = -EBUSY; + goto out; + } + } else { + l.vict = l.base; + iotlb_lock_set(obj, &l); + } cr = iotlb_alloc_cr(obj, e); if (IS_ERR(cr)) { @@ -257,9 +264,11 @@ int load_iotlb_entry(struct iommu *obj, struct iotlb_entry *e) iotlb_load_cr(obj, cr); kfree(cr); + if (e->prsvd) + l.base++; /* increment victim for next tlb load */ if (++l.vict == obj->nr_tlb_entries) - l.vict = 0; + l.vict = l.base; iotlb_lock_set(obj, &l); out: clk_disable(obj->clk); -- 2.30.2