diff options
Diffstat (limited to 'drivers/iommu/amd_iommu_init.c')
| -rw-r--r-- | drivers/iommu/amd_iommu_init.c | 118 |
1 files changed, 66 insertions, 52 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index 55f2033ea69..de7a6cedcc4 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -26,6 +26,8 @@ #include <linux/msi.h> #include <linux/amd-iommu.h> #include <linux/export.h> +#include <linux/acpi.h> +#include <acpi/acpi.h> #include <asm/pci-direct.h> #include <asm/iommu.h> #include <asm/gart.h> @@ -122,7 +124,7 @@ struct ivmd_header { bool amd_iommu_dump; -static int __initdata amd_iommu_detected; +static bool amd_iommu_detected; static bool __initdata amd_iommu_disabled; u16 amd_iommu_last_bdf; /* largest PCI device id we have @@ -149,11 +151,6 @@ bool amd_iommu_v2_present __read_mostly; bool amd_iommu_force_isolation __read_mostly; /* - * The ACPI table parsing functions set this variable on an error - */ -static int __initdata amd_iommu_init_err; - -/* * List of protection domains - used during resume */ LIST_HEAD(amd_iommu_pd_list); @@ -457,11 +454,9 @@ static int __init find_last_devid_acpi(struct acpi_table_header *table) */ for (i = 0; i < table->length; ++i) checksum += p[i]; - if (checksum != 0) { + if (checksum != 0) /* ACPI table corrupt */ - amd_iommu_init_err = -ENODEV; - return 0; - } + return -ENODEV; p += IVRS_HEADER_LENGTH; @@ -1087,16 +1082,12 @@ static int __init init_iommu_all(struct acpi_table_header *table) h->mmio_phys); iommu = kzalloc(sizeof(struct amd_iommu), GFP_KERNEL); - if (iommu == NULL) { - amd_iommu_init_err = -ENOMEM; - return 0; - } + if (iommu == NULL) + return -ENOMEM; ret = init_iommu_one(iommu, h); - if (ret) { - amd_iommu_init_err = ret; - return 0; - } + if (ret) + return ret; break; default: break; @@ -1477,9 +1468,15 @@ static void __init free_on_init_error(void) */ int __init amd_iommu_init_hardware(void) { + struct acpi_table_header *ivrs_base; + acpi_size ivrs_size; + acpi_status status; int i, ret = 0; - if (!amd_iommu_detected) + if (no_iommu || (iommu_detected && !gart_iommu_aperture)) + return -ENODEV; + + if (amd_iommu_disabled || !amd_iommu_detected) return -ENODEV; if (amd_iommu_dev_table != NULL) { @@ -1487,16 +1484,21 @@ int __init amd_iommu_init_hardware(void) return 0; } + status = acpi_get_table_with_size("IVRS", 0, &ivrs_base, &ivrs_size); + if (status == AE_NOT_FOUND) + return -ENODEV; + else if (ACPI_FAILURE(status)) { + const char *err = acpi_format_exception(status); + pr_err("AMD-Vi: IVRS table error: %s\n", err); + return -EINVAL; + } + /* * First parse ACPI tables to find the largest Bus/Dev/Func * we need to handle. Upon this information the shared data * structures for the IOMMUs in the system will be allocated */ - if (acpi_table_parse("IVRS", find_last_devid_acpi) != 0) - return -ENODEV; - - ret = amd_iommu_init_err; - if (ret) + if (find_last_devid_acpi(ivrs_base)) goto out; dev_table_size = tbl_size(DEV_TABLE_ENTRY_SIZE); @@ -1553,22 +1555,13 @@ int __init amd_iommu_init_hardware(void) * now the data structures are allocated and basically initialized * start the real acpi table scan */ - ret = -ENODEV; - if (acpi_table_parse("IVRS", init_iommu_all) != 0) - goto free; - - if (amd_iommu_init_err) { - ret = amd_iommu_init_err; - goto free; - } - - if (acpi_table_parse("IVRS", init_memory_definitions) != 0) + ret = init_iommu_all(ivrs_base); + if (ret) goto free; - if (amd_iommu_init_err) { - ret = amd_iommu_init_err; + ret = init_memory_definitions(ivrs_base); + if (ret) goto free; - } ret = amd_iommu_init_devices(); if (ret) @@ -1581,12 +1574,16 @@ int __init amd_iommu_init_hardware(void) register_syscore_ops(&amd_iommu_syscore_ops); out: + /* Don't leak any ACPI memory */ + early_acpi_os_unmap_memory((char __iomem *)ivrs_base, ivrs_size); + ivrs_base = NULL; + return ret; free: free_on_init_error(); - return ret; + goto out; } static int amd_iommu_enable_interrupts(void) @@ -1604,6 +1601,26 @@ out: return ret; } +static bool detect_ivrs(void) +{ + struct acpi_table_header *ivrs_base; + acpi_size ivrs_size; + acpi_status status; + + status = acpi_get_table_with_size("IVRS", 0, &ivrs_base, &ivrs_size); + if (status == AE_NOT_FOUND) + return false; + else if (ACPI_FAILURE(status)) { + const char *err = acpi_format_exception(status); + pr_err("AMD-Vi: IVRS table error: %s\n", err); + return false; + } + + early_acpi_os_unmap_memory((char __iomem *)ivrs_base, ivrs_size); + + return true; +} + /* * This is the core init function for AMD IOMMU hardware in the system. * This function is called from the generic x86 DMA layer initialization @@ -1663,29 +1680,26 @@ free: * IOMMUs * ****************************************************************************/ -static int __init early_amd_iommu_detect(struct acpi_table_header *table) -{ - return 0; -} - int __init amd_iommu_detect(void) { + if (no_iommu || (iommu_detected && !gart_iommu_aperture)) return -ENODEV; if (amd_iommu_disabled) return -ENODEV; - if (acpi_table_parse("IVRS", early_amd_iommu_detect) == 0) { - iommu_detected = 1; - amd_iommu_detected = 1; - x86_init.iommu.iommu_init = amd_iommu_init; + if (!detect_ivrs()) + return -ENODEV; - /* Make sure ACS will be enabled */ - pci_request_acs(); - return 1; - } - return -ENODEV; + amd_iommu_detected = true; + iommu_detected = 1; + x86_init.iommu.iommu_init = amd_iommu_init; + + /* Make sure ACS will be enabled */ + pci_request_acs(); + + return 0; } /**************************************************************************** |