[Linaro-mm-sig] [PATCH 26/29] iommu: exynos: rename variables to reflect their purpose

This patch renames some variables to make the code easier to understand. 'domain' is replaced by 'iommu_domain' (more generic entity) and really meaning less 'priv' by 'domain' to reflect its purpose.

Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com --- drivers/iommu/exynos-iommu.c | 191 ++++++++++++++++++++++--------------------- 1 file changed, 97 insertions(+), 94 deletions(-)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 5cd91b11..7600861 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -440,8 +440,8 @@ static void __sysmmu_enable_nocount(struct sysmmu_drvdata *data) clk_disable(data->clk_master); }

-static int __sysmmu_enable(struct sysmmu_drvdata *data, - phys_addr_t pgtable, struct iommu_domain *domain) +static int __sysmmu_enable(struct sysmmu_drvdata *data, phys_addr_t pgtable, + struct iommu_domain *iommu_domain) { int ret = 0; unsigned long flags; @@ -449,7 +449,7 @@ static int __sysmmu_enable(struct sysmmu_drvdata *data, spin_lock_irqsave(&data->lock, flags); if (set_sysmmu_active(data)) { data->pgtable = pgtable; - data->domain = domain; + data->domain = iommu_domain;

__sysmmu_enable_nocount(data);

@@ -664,92 +664,93 @@ static inline void pgtable_flush(void *vastart, void *vaend) virt_to_phys(vaend)); }

-static int exynos_iommu_domain_init(struct iommu_domain *domain) +static int exynos_iommu_domain_init(struct iommu_domain *iommu_domain) { - struct exynos_iommu_domain *priv; + struct exynos_iommu_domain *domain; int i;

- priv = kzalloc(sizeof(*priv), GFP_KERNEL); - if (!priv) + domain = kzalloc(sizeof(*domain), GFP_KERNEL); + if (!domain) return -ENOMEM;

- priv->pgtable = (sysmmu_pte_t *)__get_free_pages(GFP_KERNEL, 2); - if (!priv->pgtable) + domain->pgtable = (sysmmu_pte_t *)__get_free_pages(GFP_KERNEL, 2); + if (!domain->pgtable) goto err_pgtable;

- priv->lv2entcnt = (short *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1); - if (!priv->lv2entcnt) + domain->lv2entcnt = (short *) + __get_free_pages(GFP_KERNEL | __GFP_ZERO, 1); + if (!domain->lv2entcnt) goto err_counter;

/* w/a of System MMU v3.3 to prevent caching 1MiB mapping */ for (i = 0; i < NUM_LV1ENTRIES; i += 8) { - priv->pgtable[i + 0] = ZERO_LV2LINK; - priv->pgtable[i + 1] = ZERO_LV2LINK; - priv->pgtable[i + 2] = ZERO_LV2LINK; - priv->pgtable[i + 3] = ZERO_LV2LINK; - priv->pgtable[i + 4] = ZERO_LV2LINK; - priv->pgtable[i + 5] = ZERO_LV2LINK; - priv->pgtable[i + 6] = ZERO_LV2LINK; - priv->pgtable[i + 7] = ZERO_LV2LINK; + domain->pgtable[i + 0] = ZERO_LV2LINK; + domain->pgtable[i + 1] = ZERO_LV2LINK; + domain->pgtable[i + 2] = ZERO_LV2LINK; + domain->pgtable[i + 3] = ZERO_LV2LINK; + domain->pgtable[i + 4] = ZERO_LV2LINK; + domain->pgtable[i + 5] = ZERO_LV2LINK; + domain->pgtable[i + 6] = ZERO_LV2LINK; + domain->pgtable[i + 7] = ZERO_LV2LINK; }

- pgtable_flush(priv->pgtable, priv->pgtable + NUM_LV1ENTRIES); + pgtable_flush(domain->pgtable, domain->pgtable + NUM_LV1ENTRIES);

- spin_lock_init(&priv->lock); - spin_lock_init(&priv->pgtablelock); - INIT_LIST_HEAD(&priv->clients); + spin_lock_init(&domain->lock); + spin_lock_init(&domain->pgtablelock); + INIT_LIST_HEAD(&domain->clients);

- domain->geometry.aperture_start = 0; - domain->geometry.aperture_end = ~0UL; - domain->geometry.force_aperture = true; + iommu_domain->geometry.aperture_start = 0; + iommu_domain->geometry.aperture_end = ~0UL; + iommu_domain->geometry.force_aperture = true;

- domain->priv = priv; + iommu_domain->priv = domain; return 0;

err_counter: - free_pages((unsigned long)priv->pgtable, 2); + free_pages((unsigned long)domain->pgtable, 2); err_pgtable: - kfree(priv); + kfree(domain); return -ENOMEM; }

-static void exynos_iommu_domain_destroy(struct iommu_domain *domain) +static void exynos_iommu_domain_destroy(struct iommu_domain *iommu_domain) { - struct exynos_iommu_domain *priv = domain->priv; + struct exynos_iommu_domain *domain = iommu_domain->priv; struct sysmmu_drvdata *data; unsigned long flags; int i;

- WARN_ON(!list_empty(&priv->clients)); + WARN_ON(!list_empty(&domain->clients));

- spin_lock_irqsave(&priv->lock, flags); + spin_lock_irqsave(&domain->lock, flags);

- list_for_each_entry(data, &priv->clients, domain_node) { + list_for_each_entry(data, &domain->clients, domain_node) { if (__sysmmu_disable(data)) data->master = NULL; list_del_init(&data->domain_node); }

- spin_unlock_irqrestore(&priv->lock, flags); + spin_unlock_irqrestore(&domain->lock, flags);

for (i = 0; i < NUM_LV1ENTRIES; i++) - if (lv1ent_page(priv->pgtable + i)) + if (lv1ent_page(domain->pgtable + i)) kmem_cache_free(lv2table_kmem_cache, - phys_to_virt(lv2table_base(priv->pgtable + i))); + phys_to_virt(lv2table_base(domain->pgtable + i)));

- free_pages((unsigned long)priv->pgtable, 2); - free_pages((unsigned long)priv->lv2entcnt, 1); - kfree(domain->priv); - domain->priv = NULL; + free_pages((unsigned long)domain->pgtable, 2); + free_pages((unsigned long)domain->lv2entcnt, 1); + kfree(iommu_domain->priv); + iommu_domain->priv = NULL; }

-static int exynos_iommu_attach_device(struct iommu_domain *domain, +static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain, struct device *dev) { struct exynos_iommu_owner *owner = dev->archdata.iommu; - struct exynos_iommu_domain *priv = domain->priv; + struct exynos_iommu_domain *domain = iommu_domain->priv; struct sysmmu_drvdata *data; - phys_addr_t pagetable = virt_to_phys(priv->pgtable); + phys_addr_t pagetable = virt_to_phys(domain->pgtable); unsigned long flags; int ret = -ENODEV;

@@ -758,13 +759,13 @@ static int exynos_iommu_attach_device(struct iommu_domain *domain,

list_for_each_entry(data, &owner->clients, owner_node) { pm_runtime_get_sync(data->sysmmu); - ret = __sysmmu_enable(data, pagetable, domain); + ret = __sysmmu_enable(data, pagetable, iommu_domain); if (ret >= 0) { data->master = dev;

- spin_lock_irqsave(&priv->lock, flags); - list_add_tail(&data->domain_node, &priv->clients); - spin_unlock_irqrestore(&priv->lock, flags); + spin_lock_irqsave(&domain->lock, flags); + list_add_tail(&data->domain_node, &domain->clients); + spin_unlock_irqrestore(&domain->lock, flags); } pm_runtime_put(data->sysmmu); } @@ -781,11 +782,11 @@ static int exynos_iommu_attach_device(struct iommu_domain *domain, return ret; }

-static void exynos_iommu_detach_device(struct iommu_domain *domain, +static void exynos_iommu_detach_device(struct iommu_domain *iommu_domain, struct device *dev) { - struct exynos_iommu_domain *priv = domain->priv; - phys_addr_t pagetable = virt_to_phys(priv->pgtable); + struct exynos_iommu_domain *domain = iommu_domain->priv; + phys_addr_t pagetable = virt_to_phys(domain->pgtable); struct sysmmu_drvdata *data, *next; unsigned long flags; int found = 0; @@ -793,8 +794,8 @@ static void exynos_iommu_detach_device(struct iommu_domain *domain, if (!has_sysmmu(dev)) return;

- spin_lock_irqsave(&priv->lock, flags); - list_for_each_entry_safe(data, next, &priv->clients, domain_node) { + spin_lock_irqsave(&domain->lock, flags); + list_for_each_entry_safe(data, next, &domain->clients, domain_node) { if (data->master == dev) { if (__sysmmu_disable(data)) { data->master = NULL; @@ -803,7 +804,7 @@ static void exynos_iommu_detach_device(struct iommu_domain *domain, found = true; } } - spin_unlock_irqrestore(&priv->lock, flags); + spin_unlock_irqrestore(&domain->lock, flags);

if (found) dev_dbg(dev, "%s: Detached IOMMU with pgtable %pa\n", @@ -812,7 +813,7 @@ static void exynos_iommu_detach_device(struct iommu_domain *domain, dev_err(dev, "%s: No IOMMU is attached\n", __func__); }

-static sysmmu_pte_t *alloc_lv2entry(struct exynos_iommu_domain *priv, +static sysmmu_pte_t *alloc_lv2entry(struct exynos_iommu_domain *domain, sysmmu_pte_t *sent, sysmmu_iova_t iova, short *pgcounter) { if (lv1ent_section(sent)) { @@ -854,17 +855,17 @@ static sysmmu_pte_t *alloc_lv2entry(struct exynos_iommu_domain *priv, if (need_flush_flpd_cache) { struct sysmmu_drvdata *data;

- spin_lock(&priv->lock); - list_for_each_entry(data, &priv->clients, domain_node) + spin_lock(&domain->lock); + list_for_each_entry(data, &domain->clients, domain_node) sysmmu_tlb_invalidate_flpdcache(data, iova); - spin_unlock(&priv->lock); + spin_unlock(&domain->lock); } }

return page_entry(sent, iova); }

-static int lv1set_section(struct exynos_iommu_domain *priv, +static int lv1set_section(struct exynos_iommu_domain *domain, sysmmu_pte_t *sent, sysmmu_iova_t iova, phys_addr_t paddr, short *pgcnt) { @@ -889,17 +890,17 @@ static int lv1set_section(struct exynos_iommu_domain *priv,

pgtable_flush(sent, sent + 1);

- spin_lock(&priv->lock); + spin_lock(&domain->lock); if (lv1ent_page_zero(sent)) { struct sysmmu_drvdata *data; /* * Flushing FLPD cache in System MMU v3.3 that may cache a FLPD * entry by speculative prefetch of SLPD which has no mapping. */ - list_for_each_entry(data, &priv->clients, domain_node) + list_for_each_entry(data, &domain->clients, domain_node) sysmmu_tlb_invalidate_flpdcache(data, iova); } - spin_unlock(&priv->lock); + spin_unlock(&domain->lock);

return 0; } @@ -959,74 +960,76 @@ static int lv2set_page(sysmmu_pte_t *pent, phys_addr_t paddr, size_t size, * than or equal size to 128KiB. * - Start address of an I/O virtual region must be aligned by 128KiB. */ -static int exynos_iommu_map(struct iommu_domain *domain, unsigned long l_iova, - phys_addr_t paddr, size_t size, int prot) +static int exynos_iommu_map(struct iommu_domain *iommu_domain, + unsigned long l_iova, phys_addr_t paddr, size_t size, + int prot) { - struct exynos_iommu_domain *priv = domain->priv; + struct exynos_iommu_domain *domain = iommu_domain->priv; sysmmu_pte_t *entry; sysmmu_iova_t iova = (sysmmu_iova_t)l_iova; unsigned long flags; int ret = -ENOMEM;

- BUG_ON(priv->pgtable == NULL); + BUG_ON(domain->pgtable == NULL);

- spin_lock_irqsave(&priv->pgtablelock, flags); + spin_lock_irqsave(&domain->pgtablelock, flags);

- entry = section_entry(priv->pgtable, iova); + entry = section_entry(domain->pgtable, iova);

if (size == SECT_SIZE) { - ret = lv1set_section(priv, entry, iova, paddr, - &priv->lv2entcnt[lv1ent_offset(iova)]); + ret = lv1set_section(domain, entry, iova, paddr, + &domain->lv2entcnt[lv1ent_offset(iova)]); } else { sysmmu_pte_t *pent;

- pent = alloc_lv2entry(priv, entry, iova, - &priv->lv2entcnt[lv1ent_offset(iova)]); + pent = alloc_lv2entry(domain, entry, iova, + &domain->lv2entcnt[lv1ent_offset(iova)]);

if (IS_ERR(pent)) ret = PTR_ERR(pent); else ret = lv2set_page(pent, paddr, size, - &priv->lv2entcnt[lv1ent_offset(iova)]); + &domain->lv2entcnt[lv1ent_offset(iova)]); }

if (ret) pr_err("%s: Failed(%d) to map %#zx bytes @ %#x\n", __func__, ret, size, iova);

- spin_unlock_irqrestore(&priv->pgtablelock, flags); + spin_unlock_irqrestore(&domain->pgtablelock, flags);

return ret; }

-static void exynos_iommu_tlb_invalidate_entry(struct exynos_iommu_domain *priv, - sysmmu_iova_t iova, size_t size) +static +void exynos_iommu_tlb_invalidate_entry(struct exynos_iommu_domain *domain, + sysmmu_iova_t iova, size_t size) { struct sysmmu_drvdata *data; unsigned long flags;

- spin_lock_irqsave(&priv->lock, flags); + spin_lock_irqsave(&domain->lock, flags);

- list_for_each_entry(data, &priv->clients, domain_node) + list_for_each_entry(data, &domain->clients, domain_node) sysmmu_tlb_invalidate_entry(data, iova, size);

- spin_unlock_irqrestore(&priv->lock, flags); + spin_unlock_irqrestore(&domain->lock, flags); }

-static size_t exynos_iommu_unmap(struct iommu_domain *domain, +static size_t exynos_iommu_unmap(struct iommu_domain *iommu_domain, unsigned long l_iova, size_t size) { - struct exynos_iommu_domain *priv = domain->priv; + struct exynos_iommu_domain *domain = iommu_domain->priv; sysmmu_iova_t iova = (sysmmu_iova_t)l_iova; sysmmu_pte_t *ent; size_t err_pgsize; unsigned long flags;

- BUG_ON(priv->pgtable == NULL); + BUG_ON(domain->pgtable == NULL);

- spin_lock_irqsave(&priv->pgtablelock, flags); + spin_lock_irqsave(&domain->pgtablelock, flags);

- ent = section_entry(priv->pgtable, iova); + ent = section_entry(domain->pgtable, iova);

if (lv1ent_section(ent)) { if (WARN_ON(size < SECT_SIZE)) { @@ -1059,7 +1062,7 @@ static size_t exynos_iommu_unmap(struct iommu_domain *domain, *ent = 0; size = SPAGE_SIZE; pgtable_flush(ent, ent + 1); - priv->lv2entcnt[lv1ent_offset(iova)] += 1; + domain->lv2entcnt[lv1ent_offset(iova)] += 1; goto done; }

@@ -1073,15 +1076,15 @@ static size_t exynos_iommu_unmap(struct iommu_domain *domain, pgtable_flush(ent, ent + SPAGES_PER_LPAGE);

size = LPAGE_SIZE; - priv->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE; + domain->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE; done: - spin_unlock_irqrestore(&priv->pgtablelock, flags); + spin_unlock_irqrestore(&domain->pgtablelock, flags);

- exynos_iommu_tlb_invalidate_entry(priv, iova, size); + exynos_iommu_tlb_invalidate_entry(domain, iova, size);

return size; err: - spin_unlock_irqrestore(&priv->pgtablelock, flags); + spin_unlock_irqrestore(&domain->pgtablelock, flags);

pr_err("%s: Failed: size(%#zx) @ %#x is smaller than page size %#zx\n", __func__, size, iova, err_pgsize); @@ -1089,17 +1092,17 @@ err: return 0; }

-static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *domain, +static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *iommu_domain, dma_addr_t iova) { - struct exynos_iommu_domain *priv = domain->priv; + struct exynos_iommu_domain *domain = iommu_domain->priv; sysmmu_pte_t *entry; unsigned long flags; phys_addr_t phys = 0;

- spin_lock_irqsave(&priv->pgtablelock, flags); + spin_lock_irqsave(&domain->pgtablelock, flags);

- entry = section_entry(priv->pgtable, iova); + entry = section_entry(domain->pgtable, iova);

if (lv1ent_section(entry)) { phys = section_phys(entry) + section_offs(iova); @@ -1112,7 +1115,7 @@ static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *domain, phys = spage_phys(entry) + spage_offs(iova); }

- spin_unlock_irqrestore(&priv->pgtablelock, flags); + spin_unlock_irqrestore(&domain->pgtablelock, flags);

return phys; }