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Date: Thu, 26 Jun 2008 21:27:58 +0200
From: Joerg Roedel <joerg.roedel@....com>
To: tglx@...utronix.de, mingo@...hat.com
CC: linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
bhavna.sarathy@....com, Sebastian.Biemueller@....com,
robert.richter@....com, joro@...tes.org,
Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 22/34] AMD IOMMU: add domain allocation and deallocation functions
This patch adds the functions to allocate and free protection domains for the
IOMMU.
Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
arch/x86/kernel/amd_iommu.c | 147 +++++++++++++++++++++++++++++++++++++++++++
1 files changed, 147 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 69d8d02..c43d15d 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -314,3 +314,150 @@ static void dma_ops_free_addresses(struct dma_ops_domain *dom,
iommu_area_free(dom->bitmap, address, pages);
}
+static u16 domain_id_alloc(void)
+{
+ unsigned long flags;
+ int id;
+
+ write_lock_irqsave(&amd_iommu_devtable_lock, flags);
+ id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID);
+ BUG_ON(id == 0);
+ if (id > 0 && id < MAX_DOMAIN_ID)
+ __set_bit(id, amd_iommu_pd_alloc_bitmap);
+ else
+ id = 0;
+ write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
+
+ return id;
+}
+
+static void dma_ops_reserve_addresses(struct dma_ops_domain *dom,
+ unsigned long start_page,
+ unsigned int pages)
+{
+ unsigned int last_page = dom->aperture_size >> PAGE_SHIFT;
+
+ if (start_page + pages > last_page)
+ pages = last_page - start_page;
+
+ set_bit_string(dom->bitmap, start_page, pages);
+}
+
+static void dma_ops_free_pagetable(struct dma_ops_domain *dma_dom)
+{
+ int i, j;
+ u64 *p1, *p2, *p3;
+
+ p1 = dma_dom->domain.pt_root;
+
+ if (!p1)
+ return;
+
+ for (i = 0; i < 512; ++i) {
+ if (!IOMMU_PTE_PRESENT(p1[i]))
+ continue;
+
+ p2 = IOMMU_PTE_PAGE(p1[i]);
+ for (j = 0; j < 512; ++i) {
+ if (!IOMMU_PTE_PRESENT(p2[j]))
+ continue;
+ p3 = IOMMU_PTE_PAGE(p2[j]);
+ free_page((unsigned long)p3);
+ }
+
+ free_page((unsigned long)p2);
+ }
+
+ free_page((unsigned long)p1);
+}
+
+static void dma_ops_domain_free(struct dma_ops_domain *dom)
+{
+ if (!dom)
+ return;
+
+ dma_ops_free_pagetable(dom);
+
+ kfree(dom->pte_pages);
+
+ kfree(dom->bitmap);
+
+ kfree(dom);
+}
+
+static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu,
+ unsigned order)
+{
+ struct dma_ops_domain *dma_dom;
+ unsigned i, num_pte_pages;
+ u64 *l2_pde;
+ u64 address;
+
+ /*
+ * Currently the DMA aperture must be between 32 MB and 1GB in size
+ */
+ if ((order < 25) || (order > 30))
+ return NULL;
+
+ dma_dom = kzalloc(sizeof(struct dma_ops_domain), GFP_KERNEL);
+ if (!dma_dom)
+ return NULL;
+
+ spin_lock_init(&dma_dom->domain.lock);
+
+ dma_dom->domain.id = domain_id_alloc();
+ if (dma_dom->domain.id == 0)
+ goto free_dma_dom;
+ dma_dom->domain.mode = PAGE_MODE_3_LEVEL;
+ dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL);
+ dma_dom->domain.priv = dma_dom;
+ if (!dma_dom->domain.pt_root)
+ goto free_dma_dom;
+ dma_dom->aperture_size = (1ULL << order);
+ dma_dom->bitmap = kzalloc(dma_dom->aperture_size / (PAGE_SIZE * 8),
+ GFP_KERNEL);
+ if (!dma_dom->bitmap)
+ goto free_dma_dom;
+ /*
+ * mark the first page as allocated so we never return 0 as
+ * a valid dma-address. So we can use 0 as error value
+ */
+ dma_dom->bitmap[0] = 1;
+ dma_dom->next_bit = 0;
+
+ if (iommu->exclusion_start &&
+ iommu->exclusion_start < dma_dom->aperture_size) {
+ unsigned long startpage = iommu->exclusion_start >> PAGE_SHIFT;
+ int pages = to_pages(iommu->exclusion_start,
+ iommu->exclusion_length);
+ dma_ops_reserve_addresses(dma_dom, startpage, pages);
+ }
+
+ num_pte_pages = dma_dom->aperture_size / (PAGE_SIZE * 512);
+ dma_dom->pte_pages = kzalloc(num_pte_pages * sizeof(void *),
+ GFP_KERNEL);
+ if (!dma_dom->pte_pages)
+ goto free_dma_dom;
+
+ l2_pde = (u64 *)get_zeroed_page(GFP_KERNEL);
+ if (l2_pde == NULL)
+ goto free_dma_dom;
+
+ dma_dom->domain.pt_root[0] = IOMMU_L2_PDE(virt_to_phys(l2_pde));
+
+ for (i = 0; i < num_pte_pages; ++i) {
+ dma_dom->pte_pages[i] = (u64 *)get_zeroed_page(GFP_KERNEL);
+ if (!dma_dom->pte_pages[i])
+ goto free_dma_dom;
+ address = virt_to_phys(dma_dom->pte_pages[i]);
+ l2_pde[i] = IOMMU_L1_PDE(address);
+ }
+
+ return dma_dom;
+
+free_dma_dom:
+ dma_ops_domain_free(dma_dom);
+
+ return NULL;
+}
+
--
1.5.3.7
--
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