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| author | David Woodhouse <David.Woodhouse@intel.com> | 2009-08-04 09:17:20 +0100 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2009-08-04 09:17:24 +0100 |
| commit | 0815565adfe3f4c369110c57d8ffe83caefeed68 (patch) | |
| tree | c1a2436a7f8c7b61a09ab1b809f65bd5b1325ccc /drivers/pci/dmar.c | |
| parent | cfc65dd57967f2e0c7b3a8b73e6d12470b1cf1c1 (diff) | |
| download | kernel-crypto-0815565adfe3f4c369110c57d8ffe83caefeed68.tar.gz kernel-crypto-0815565adfe3f4c369110c57d8ffe83caefeed68.tar.xz kernel-crypto-0815565adfe3f4c369110c57d8ffe83caefeed68.zip | |
intel-iommu: Cope with broken HP DC7900 BIOS
Yet another reason why trusting this stuff to the BIOS was a bad idea.
The HP DC7900 BIOS reports an iommu at an address which just returns all
ones, when VT-d is disabled in the BIOS.
Fix up the missing iounmap in the error paths while we're at it.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/pci/dmar.c')
| -rw-r--r-- | drivers/pci/dmar.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c index 7b287cb38b7..380b60e677e 100644 --- a/drivers/pci/dmar.c +++ b/drivers/pci/dmar.c @@ -632,20 +632,31 @@ int alloc_iommu(struct dmar_drhd_unit *drhd) iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG); iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG); + if (iommu->cap == (uint64_t)-1 && iommu->ecap == (uint64_t)-1) { + /* Promote an attitude of violence to a BIOS engineer today */ + WARN(1, "Your BIOS is broken; DMAR reported at address %llx returns all ones!\n" + "BIOS vendor: %s; Ver: %s; Product Version: %s\n", + drhd->reg_base_addr, + dmi_get_system_info(DMI_BIOS_VENDOR), + dmi_get_system_info(DMI_BIOS_VERSION), + dmi_get_system_info(DMI_PRODUCT_VERSION)); + goto err_unmap; + } + #ifdef CONFIG_DMAR agaw = iommu_calculate_agaw(iommu); if (agaw < 0) { printk(KERN_ERR "Cannot get a valid agaw for iommu (seq_id = %d)\n", iommu->seq_id); - goto error; + goto err_unmap; } msagaw = iommu_calculate_max_sagaw(iommu); if (msagaw < 0) { printk(KERN_ERR "Cannot get a valid max agaw for iommu (seq_id = %d)\n", iommu->seq_id); - goto error; + goto err_unmap; } #endif iommu->agaw = agaw; @@ -665,7 +676,7 @@ int alloc_iommu(struct dmar_drhd_unit *drhd) } ver = readl(iommu->reg + DMAR_VER_REG); - pr_debug("IOMMU %llx: ver %d:%d cap %llx ecap %llx\n", + pr_info("IOMMU %llx: ver %d:%d cap %llx ecap %llx\n", (unsigned long long)drhd->reg_base_addr, DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver), (unsigned long long)iommu->cap, @@ -675,7 +686,10 @@ int alloc_iommu(struct dmar_drhd_unit *drhd) drhd->iommu = iommu; return 0; -error: + + err_unmap: + iounmap(iommu->reg); + error: kfree(iommu); return -1; } |