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authorJiang Liu <jiang.liu@linux.intel.com>2014-11-09 22:47:56 +0800
committerJoerg Roedel <jroedel@suse.de>2014-11-18 11:18:35 +0100
commitc2a0b538d2c778aef7bf2fbe7973229192c9a392 (patch)
tree43fb6451526e573d70bd29cca9f2bef286b5a0ee /drivers/iommu/dmar.c
parent1a2262f90f493103496f3383741fb5d594c33738 (diff)
iommu/vt-d: Introduce helper function dmar_walk_resources()
Introduce helper function dmar_walk_resources to walk resource entries in DMAR table and ACPI buffer object returned by ACPI _DSM method for IOMMU hot-plug. Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/dmar.c')
-rw-r--r--drivers/iommu/dmar.c209
1 files changed, 111 insertions, 98 deletions
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index c5c61cabd6e3..586dd2aa2ca2 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -44,6 +44,14 @@
#include "irq_remapping.h"
+typedef int (*dmar_res_handler_t)(struct acpi_dmar_header *, void *);
+struct dmar_res_callback {
+ dmar_res_handler_t cb[ACPI_DMAR_TYPE_RESERVED];
+ void *arg[ACPI_DMAR_TYPE_RESERVED];
+ bool ignore_unhandled;
+ bool print_entry;
+};
+
/*
* Assumptions:
* 1) The hotplug framework guarentees that DMAR unit will be hot-added
@@ -350,7 +358,7 @@ static struct notifier_block dmar_pci_bus_nb = {
* present in the platform
*/
static int __init
-dmar_parse_one_drhd(struct acpi_dmar_header *header)
+dmar_parse_one_drhd(struct acpi_dmar_header *header, void *arg)
{
struct acpi_dmar_hardware_unit *drhd;
struct dmar_drhd_unit *dmaru;
@@ -381,6 +389,10 @@ dmar_parse_one_drhd(struct acpi_dmar_header *header)
return ret;
}
dmar_register_drhd_unit(dmaru);
+
+ if (arg)
+ (*(int *)arg)++;
+
return 0;
}
@@ -393,7 +405,8 @@ static void dmar_free_drhd(struct dmar_drhd_unit *dmaru)
kfree(dmaru);
}
-static int __init dmar_parse_one_andd(struct acpi_dmar_header *header)
+static int __init dmar_parse_one_andd(struct acpi_dmar_header *header,
+ void *arg)
{
struct acpi_dmar_andd *andd = (void *)header;
@@ -415,7 +428,7 @@ static int __init dmar_parse_one_andd(struct acpi_dmar_header *header)
#ifdef CONFIG_ACPI_NUMA
static int __init
-dmar_parse_one_rhsa(struct acpi_dmar_header *header)
+dmar_parse_one_rhsa(struct acpi_dmar_header *header, void *arg)
{
struct acpi_dmar_rhsa *rhsa;
struct dmar_drhd_unit *drhd;
@@ -442,6 +455,8 @@ dmar_parse_one_rhsa(struct acpi_dmar_header *header)
return 0;
}
+#else
+#define dmar_parse_one_rhsa dmar_res_noop
#endif
static void __init
@@ -503,6 +518,52 @@ static int __init dmar_table_detect(void)
return (ACPI_SUCCESS(status) ? 1 : 0);
}
+static int dmar_walk_remapping_entries(struct acpi_dmar_header *start,
+ size_t len, struct dmar_res_callback *cb)
+{
+ int ret = 0;
+ struct acpi_dmar_header *iter, *next;
+ struct acpi_dmar_header *end = ((void *)start) + len;
+
+ for (iter = start; iter < end && ret == 0; iter = next) {
+ next = (void *)iter + iter->length;
+ if (iter->length == 0) {
+ /* Avoid looping forever on bad ACPI tables */
+ pr_debug(FW_BUG "Invalid 0-length structure\n");
+ break;
+ } else if (next > end) {
+ /* Avoid passing table end */
+ pr_warn(FW_BUG "record passes table end\n");
+ ret = -EINVAL;
+ break;
+ }
+
+ if (cb->print_entry)
+ dmar_table_print_dmar_entry(iter);
+
+ if (iter->type >= ACPI_DMAR_TYPE_RESERVED) {
+ /* continue for forward compatibility */
+ pr_debug("Unknown DMAR structure type %d\n",
+ iter->type);
+ } else if (cb->cb[iter->type]) {
+ ret = cb->cb[iter->type](iter, cb->arg[iter->type]);
+ } else if (!cb->ignore_unhandled) {
+ pr_warn("No handler for DMAR structure type %d\n",
+ iter->type);
+ ret = -EINVAL;
+ }
+ }
+
+ return ret;
+}
+
+static inline int dmar_walk_dmar_table(struct acpi_table_dmar *dmar,
+ struct dmar_res_callback *cb)
+{
+ return dmar_walk_remapping_entries((void *)(dmar + 1),
+ dmar->header.length - sizeof(*dmar), cb);
+}
+
/**
* parse_dmar_table - parses the DMA reporting table
*/
@@ -510,9 +571,18 @@ static int __init
parse_dmar_table(void)
{
struct acpi_table_dmar *dmar;
- struct acpi_dmar_header *entry_header;
int ret = 0;
int drhd_count = 0;
+ struct dmar_res_callback cb = {
+ .print_entry = true,
+ .ignore_unhandled = true,
+ .arg[ACPI_DMAR_TYPE_HARDWARE_UNIT] = &drhd_count,
+ .cb[ACPI_DMAR_TYPE_HARDWARE_UNIT] = &dmar_parse_one_drhd,
+ .cb[ACPI_DMAR_TYPE_RESERVED_MEMORY] = &dmar_parse_one_rmrr,
+ .cb[ACPI_DMAR_TYPE_ROOT_ATS] = &dmar_parse_one_atsr,
+ .cb[ACPI_DMAR_TYPE_HARDWARE_AFFINITY] = &dmar_parse_one_rhsa,
+ .cb[ACPI_DMAR_TYPE_NAMESPACE] = &dmar_parse_one_andd,
+ };
/*
* Do it again, earlier dmar_tbl mapping could be mapped with
@@ -536,51 +606,10 @@ parse_dmar_table(void)
}
pr_info("Host address width %d\n", dmar->width + 1);
-
- entry_header = (struct acpi_dmar_header *)(dmar + 1);
- while (((unsigned long)entry_header) <
- (((unsigned long)dmar) + dmar_tbl->length)) {
- /* Avoid looping forever on bad ACPI tables */
- if (entry_header->length == 0) {
- pr_warn("Invalid 0-length structure\n");
- ret = -EINVAL;
- break;
- }
-
- dmar_table_print_dmar_entry(entry_header);
-
- switch (entry_header->type) {
- case ACPI_DMAR_TYPE_HARDWARE_UNIT:
- drhd_count++;
- ret = dmar_parse_one_drhd(entry_header);
- break;
- case ACPI_DMAR_TYPE_RESERVED_MEMORY:
- ret = dmar_parse_one_rmrr(entry_header);
- break;
- case ACPI_DMAR_TYPE_ROOT_ATS:
- ret = dmar_parse_one_atsr(entry_header);
- break;
- case ACPI_DMAR_TYPE_HARDWARE_AFFINITY:
-#ifdef CONFIG_ACPI_NUMA
- ret = dmar_parse_one_rhsa(entry_header);
-#endif
- break;
- case ACPI_DMAR_TYPE_NAMESPACE:
- ret = dmar_parse_one_andd(entry_header);
- break;
- default:
- pr_warn("Unknown DMAR structure type %d\n",
- entry_header->type);
- ret = 0; /* for forward compatibility */
- break;
- }
- if (ret)
- break;
-
- entry_header = ((void *)entry_header + entry_header->length);
- }
- if (drhd_count == 0)
+ ret = dmar_walk_dmar_table(dmar, &cb);
+ if (ret == 0 && drhd_count == 0)
pr_warn(FW_BUG "No DRHD structure found in DMAR table\n");
+
return ret;
}
@@ -778,76 +807,60 @@ static void warn_invalid_dmar(u64 addr, const char *message)
dmi_get_system_info(DMI_PRODUCT_VERSION));
}
-static int __init check_zero_address(void)
+static int __ref
+dmar_validate_one_drhd(struct acpi_dmar_header *entry, void *arg)
{
- struct acpi_table_dmar *dmar;
- struct acpi_dmar_header *entry_header;
struct acpi_dmar_hardware_unit *drhd;
+ void __iomem *addr;
+ u64 cap, ecap;
- dmar = (struct acpi_table_dmar *)dmar_tbl;
- entry_header = (struct acpi_dmar_header *)(dmar + 1);
-
- while (((unsigned long)entry_header) <
- (((unsigned long)dmar) + dmar_tbl->length)) {
- /* Avoid looping forever on bad ACPI tables */
- if (entry_header->length == 0) {
- pr_warn("Invalid 0-length structure\n");
- return 0;
- }
-
- if (entry_header->type == ACPI_DMAR_TYPE_HARDWARE_UNIT) {
- void __iomem *addr;
- u64 cap, ecap;
-
- drhd = (void *)entry_header;
- if (!drhd->address) {
- warn_invalid_dmar(0, "");
- goto failed;
- }
+ drhd = (void *)entry;
+ if (!drhd->address) {
+ warn_invalid_dmar(0, "");
+ return -EINVAL;
+ }
- addr = early_ioremap(drhd->address, VTD_PAGE_SIZE);
- if (!addr ) {
- printk("IOMMU: can't validate: %llx\n", drhd->address);
- goto failed;
- }
- cap = dmar_readq(addr + DMAR_CAP_REG);
- ecap = dmar_readq(addr + DMAR_ECAP_REG);
- early_iounmap(addr, VTD_PAGE_SIZE);
- if (cap == (uint64_t)-1 && ecap == (uint64_t)-1) {
- warn_invalid_dmar(drhd->address,
- " returns all ones");
- goto failed;
- }
- }
+ addr = early_ioremap(drhd->address, VTD_PAGE_SIZE);
+ if (!addr) {
+ pr_warn("IOMMU: can't validate: %llx\n", drhd->address);
+ return -EINVAL;
+ }
+ cap = dmar_readq(addr + DMAR_CAP_REG);
+ ecap = dmar_readq(addr + DMAR_ECAP_REG);
+ early_iounmap(addr, VTD_PAGE_SIZE);
- entry_header = ((void *)entry_header + entry_header->length);
+ if (cap == (uint64_t)-1 && ecap == (uint64_t)-1) {
+ warn_invalid_dmar(drhd->address, " returns all ones");
+ return -EINVAL;
}
- return 1;
-failed:
return 0;
}
int __init detect_intel_iommu(void)
{
int ret;
+ struct dmar_res_callback validate_drhd_cb = {
+ .cb[ACPI_DMAR_TYPE_HARDWARE_UNIT] = &dmar_validate_one_drhd,
+ .ignore_unhandled = true,
+ };
down_write(&dmar_global_lock);
ret = dmar_table_detect();
if (ret)
- ret = check_zero_address();
- {
- if (ret && !no_iommu && !iommu_detected && !dmar_disabled) {
- iommu_detected = 1;
- /* Make sure ACS will be enabled */
- pci_request_acs();
- }
+ ret = !dmar_walk_dmar_table((struct acpi_table_dmar *)dmar_tbl,
+ &validate_drhd_cb);
+ if (ret && !no_iommu && !iommu_detected && !dmar_disabled) {
+ iommu_detected = 1;
+ /* Make sure ACS will be enabled */
+ pci_request_acs();
+ }
#ifdef CONFIG_X86
- if (ret)
- x86_init.iommu.iommu_init = intel_iommu_init;
+ if (ret)
+ x86_init.iommu.iommu_init = intel_iommu_init;
#endif
- }
+
early_acpi_os_unmap_memory((void __iomem *)dmar_tbl, dmar_tbl_size);
dmar_tbl = NULL;
up_write(&dmar_global_lock);