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Subject[PATCH 01/10] iommu/vt-d: Update iommu_attach_domain() and its callers
Date
Allow specification of the domain-id for the new domain.
This patch only adds the 'did' parameter to iommu_attach_domain()
and modifies all of its callers to specify the default value of -1
which says "no did specified, allocate a new one".

This is no functional change from current behaviour -- just enables
a functional change to be made in a later patch.

Bill Sumner:
Original version.

Li, Zhenhua:
Minor change, add change to function __iommu_attach_domain.

Signed-off-by: Bill Sumner <billsumnerlinux@gmail.com>
Signed-off-by: Li, Zhen-Hua <zhen-hual@hp.com>
---
drivers/iommu/intel-iommu.c | 34 ++++++++++++++++++++--------------
1 file changed, 20 insertions(+), 14 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 1232336..2dc6250 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1534,31 +1534,36 @@ static struct dmar_domain *alloc_domain(int flags)
}

static int __iommu_attach_domain(struct dmar_domain *domain,
- struct intel_iommu *iommu)
+ struct intel_iommu *iommu,
+ int domain_number)
{
int num;
unsigned long ndomains;

ndomains = cap_ndoms(iommu->cap);
- num = find_first_zero_bit(iommu->domain_ids, ndomains);
- if (num < ndomains) {
- set_bit(num, iommu->domain_ids);
- iommu->domains[num] = domain;
- } else {
- num = -ENOSPC;
- }
+ if (domain_number < 0) {
+ num = find_first_zero_bit(iommu->domain_ids, ndomains);
+ if (num < ndomains) {
+ set_bit(num, iommu->domain_ids);
+ iommu->domains[num] = domain;
+ } else {
+ num = -ENOSPC;
+ }
+ } else
+ num = domain_number;

return num;
}

static int iommu_attach_domain(struct dmar_domain *domain,
- struct intel_iommu *iommu)
+ struct intel_iommu *iommu,
+ int domain_number)
{
int num;
unsigned long flags;

spin_lock_irqsave(&iommu->lock, flags);
- num = __iommu_attach_domain(domain, iommu);
+ num = __iommu_attach_domain(domain, iommu, domain_number);
spin_unlock_irqrestore(&iommu->lock, flags);
if (num < 0)
pr_err("IOMMU: no free domain ids\n");
@@ -1577,7 +1582,7 @@ static int iommu_attach_vm_domain(struct dmar_domain *domain,
if (iommu->domains[num] == domain)
return num;

- return __iommu_attach_domain(domain, iommu);
+ return __iommu_attach_domain(domain, iommu, -1);
}

static void iommu_detach_domain(struct dmar_domain *domain,
@@ -2231,6 +2236,7 @@ static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
u16 dma_alias;
unsigned long flags;
u8 bus, devfn;
+ int did = -1; /* Default to "no domain_id supplied" */

domain = find_domain(dev);
if (domain)
@@ -2264,7 +2270,7 @@ static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
domain = alloc_domain(0);
if (!domain)
return NULL;
- domain->id = iommu_attach_domain(domain, iommu);
+ domain->id = iommu_attach_domain(domain, iommu, did);
if (domain->id < 0) {
free_domain_mem(domain);
return NULL;
@@ -2442,7 +2448,7 @@ static int __init si_domain_init(int hw)
return -EFAULT;

for_each_active_iommu(iommu, drhd) {
- ret = iommu_attach_domain(si_domain, iommu);
+ ret = iommu_attach_domain(si_domain, iommu, -1);
if (ret < 0) {
domain_exit(si_domain);
return -EFAULT;
@@ -3866,7 +3872,7 @@ static int intel_iommu_add(struct dmar_drhd_unit *dmaru)
iommu_enable_translation(iommu);

if (si_domain) {
- ret = iommu_attach_domain(si_domain, iommu);
+ ret = iommu_attach_domain(si_domain, iommu, -1);
if (ret < 0 || si_domain->id != ret)
goto disable_iommu;
domain_attach_iommu(si_domain, iommu);
--
2.0.0-rc0


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