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Subject[PATCH 3/4] iommu/arm-smmu-v3: Use NUMA memory allocations for stream tables and comamnd queues
Date
Introduce smmu_alloc_coherent and smmu_free_coherent functions to
allocate/free dma coherent memory from NUMA node associated with SMMU.
Replace all calls of dmam_alloc_coherent with smmu_alloc_coherent
for SMMU stream tables and command queues.

Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com>
---
drivers/iommu/arm-smmu-v3.c | 57 ++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 51 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index e67ba6c..bc4ba1f 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1158,6 +1158,50 @@ static void arm_smmu_init_bypass_stes(u64 *strtab, unsigned int nent)
}
}

+static void *smmu_alloc_coherent(struct arm_smmu_device *smmu, size_t size,
+ dma_addr_t *dma_handle, gfp_t gfp)
+{
+ struct device *dev = smmu->dev;
+ void *pages;
+ dma_addr_t dma;
+ int numa_node = dev_to_node(dev);
+
+ pages = alloc_pages_exact_nid(numa_node, size, gfp | __GFP_ZERO);
+ if (!pages)
+ return NULL;
+
+ if (!(smmu->features & ARM_SMMU_FEAT_COHERENCY)) {
+ dma = dma_map_single(dev, pages, size, DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, dma))
+ goto out_free;
+ /*
+ * We depend on the SMMU being able to work with any physical
+ * address directly, so if the DMA layer suggests otherwise by
+ * translating or truncating them, that bodes very badly...
+ */
+ if (dma != virt_to_phys(pages))
+ goto out_unmap;
+ }
+
+ *dma_handle = (dma_addr_t)virt_to_phys(pages);
+ return pages;
+
+out_unmap:
+ dev_err(dev, "Cannot accommodate DMA translation for IOMMU page tables\n");
+ dma_unmap_single(dev, dma, size, DMA_TO_DEVICE);
+out_free:
+ free_pages_exact(pages, size);
+ return NULL;
+}
+
+static void smmu_free_coherent(struct arm_smmu_device *smmu, size_t size,
+ void *pages, dma_addr_t dma_handle)
+{
+ if (!(smmu->features & ARM_SMMU_FEAT_COHERENCY))
+ dma_unmap_single(smmu->dev, dma_handle, size, DMA_TO_DEVICE);
+ free_pages_exact(pages, size);
+}
+
static int arm_smmu_init_l2_strtab(struct arm_smmu_device *smmu, u32 sid)
{
size_t size;
@@ -1172,7 +1216,7 @@ static int arm_smmu_init_l2_strtab(struct arm_smmu_device *smmu, u32 sid)
strtab = &cfg->strtab[(sid >> STRTAB_SPLIT) * STRTAB_L1_DESC_DWORDS];

desc->span = STRTAB_SPLIT + 1;
- desc->l2ptr = dmam_alloc_coherent(smmu->dev, size, &desc->l2ptr_dma,
+ desc->l2ptr = smmu_alloc_coherent(smmu, size, &desc->l2ptr_dma,
GFP_KERNEL | __GFP_ZERO);
if (!desc->l2ptr) {
dev_err(smmu->dev,
@@ -1487,7 +1531,7 @@ static void arm_smmu_domain_free(struct iommu_domain *domain)
struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;

if (cfg->cdptr) {
- dmam_free_coherent(smmu_domain->smmu->dev,
+ smmu_free_coherent(smmu,
CTXDESC_CD_DWORDS << 3,
cfg->cdptr,
cfg->cdptr_dma);
@@ -1515,7 +1559,7 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
if (asid < 0)
return asid;

- cfg->cdptr = dmam_alloc_coherent(smmu->dev, CTXDESC_CD_DWORDS << 3,
+ cfg->cdptr = smmu_alloc_coherent(smmu, CTXDESC_CD_DWORDS << 3,
&cfg->cdptr_dma,
GFP_KERNEL | __GFP_ZERO);
if (!cfg->cdptr) {
@@ -1984,7 +2028,7 @@ static int arm_smmu_init_one_queue(struct arm_smmu_device *smmu,
{
size_t qsz = ((1 << q->max_n_shift) * dwords) << 3;

- q->base = dmam_alloc_coherent(smmu->dev, qsz, &q->base_dma, GFP_KERNEL);
+ q->base = smmu_alloc_coherent(smmu, qsz, &q->base_dma, GFP_KERNEL);
if (!q->base) {
dev_err(smmu->dev, "failed to allocate queue (0x%zx bytes)\n",
qsz);
@@ -2069,7 +2113,7 @@ static int arm_smmu_init_strtab_2lvl(struct arm_smmu_device *smmu)
size, smmu->sid_bits);

l1size = cfg->num_l1_ents * (STRTAB_L1_DESC_DWORDS << 3);
- strtab = dmam_alloc_coherent(smmu->dev, l1size, &cfg->strtab_dma,
+ strtab = smmu_alloc_coherent(smmu, l1size, &cfg->strtab_dma,
GFP_KERNEL | __GFP_ZERO);
if (!strtab) {
dev_err(smmu->dev,
@@ -2097,8 +2141,9 @@ static int arm_smmu_init_strtab_linear(struct arm_smmu_device *smmu)
u32 size;
struct arm_smmu_strtab_cfg *cfg = &smmu->strtab_cfg;

+
size = (1 << smmu->sid_bits) * (STRTAB_STE_DWORDS << 3);
- strtab = dmam_alloc_coherent(smmu->dev, size, &cfg->strtab_dma,
+ strtab = smmu_alloc_coherent(smmu, size, &cfg->strtab_dma,
GFP_KERNEL | __GFP_ZERO);
if (!strtab) {
dev_err(smmu->dev,
--
2.9.4
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