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Message-ID: <A6AD88C3F2289247BE726C37303E1EB88EAB57E1@orsmsx505.amr.corp.intel.com>
Date:	Sat, 22 Nov 2008 08:18:02 -0800
From:	"Yu, Fenghua" <fenghua.yu@...el.com>
To:	'FUJITA Tomonori' <fujita.tomonori@....ntt.co.jp>,
	"Luck, Tony" <tony.luck@...el.com>,
	"'dwmw2@...radead.org'" <dwmw2@...radead.org>
CC:	"'linux-ia64@...r.kernel.org'" <linux-ia64@...r.kernel.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'mingo@...e.hu'" <mingo@...e.hu>
Subject: RE: [PATCH] IA64: fix VT-d dma_mapping_error

 
>+int intel_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
>+{
>+	return !dma_addr;
>+}

The implementation of inte_dma_mapping_error is incomplete.

Dma_addr is valid only when it belongs to hwdev's domain. This is all about VT-d isolation fundamental.

+int intel_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
+{
+        struct pci_dev *pdev = to_pci_dev(hwdev);
+        struct dmar_domain *domain;
+        struct iova *iova;
+
+        domain = find_domain(pdev);
+
+        iova = find_iova(&domain->iovad, IOVA_PFN(dma_addr));
+        if (!iova)
+                return -EINVAL;
+	   return 0;
+}
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