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Subject[PATCH v4 1/4] acpi: arm64: add iort support for PMCG
Date
From: Neil Leeder <nleeder@codeaurora.org>

Add support for the SMMU Performance Monitor Counter Group
information from ACPI. This is in preparation for its use
in the SMMUv3 PMU driver.

Signed-off-by: Neil Leeder <nleeder@codeaurora.org>
Signed-off-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
drivers/acpi/arm64/iort.c | 97 +++++++++++++++++++++++++++++++++++++----------
1 file changed, 76 insertions(+), 21 deletions(-)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 08f26db..c44d8f6 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -356,7 +356,8 @@ static struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT ||
node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX ||
- node->type == ACPI_IORT_NODE_SMMU_V3) {
+ node->type == ACPI_IORT_NODE_SMMU_V3 ||
+ node->type == ACPI_IORT_NODE_PMCG) {
*id_out = map->output_base;
return parent;
}
@@ -394,6 +395,8 @@ static int iort_get_id_mapping_index(struct acpi_iort_node *node)
}

return smmu->id_mapping_index;
+ case ACPI_IORT_NODE_PMCG:
+ return 0;
default:
return -EINVAL;
}
@@ -1216,14 +1219,23 @@ static void __init arm_smmu_v3_init_resources(struct resource *res,
}
}

-static bool __init arm_smmu_v3_is_coherent(struct acpi_iort_node *node)
+static void __init arm_smmu_v3_dma_configure(struct device *dev,
+ struct acpi_iort_node *node)
{
struct acpi_iort_smmu_v3 *smmu;
+ enum dev_dma_attr attr;

/* Retrieve SMMUv3 specific data */
smmu = (struct acpi_iort_smmu_v3 *)node->node_data;

- return smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE;
+ attr = (smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE) ?
+ DEV_DMA_COHERENT : DEV_DMA_NON_COHERENT;
+
+ /* We expect the dma masks to be equivalent for all SMMUv3 set-ups */
+ dev->dma_mask = &dev->coherent_dma_mask;
+
+ /* Configure DMA for the page table walker */
+ acpi_dma_configure(dev, attr);
}

#if defined(CONFIG_ACPI_NUMA)
@@ -1299,20 +1311,64 @@ static void __init arm_smmu_init_resources(struct resource *res,
}
}

-static bool __init arm_smmu_is_coherent(struct acpi_iort_node *node)
+static void __init arm_smmu_dma_configure(struct device *dev,
+ struct acpi_iort_node *node)
{
struct acpi_iort_smmu *smmu;
+ enum dev_dma_attr attr;

/* Retrieve SMMU specific data */
smmu = (struct acpi_iort_smmu *)node->node_data;

- return smmu->flags & ACPI_IORT_SMMU_COHERENT_WALK;
+ attr = (smmu->flags & ACPI_IORT_SMMU_COHERENT_WALK) ?
+ DEV_DMA_COHERENT : DEV_DMA_NON_COHERENT;
+
+ /* We expect the dma masks to be equivalent for SMMU set-ups */
+ dev->dma_mask = &dev->coherent_dma_mask;
+
+ /* Configure DMA for the page table walker */
+ acpi_dma_configure(dev, attr);
+}
+
+static int __init arm_smmu_v3_pmcg_count_resources(struct acpi_iort_node *node)
+{
+ struct acpi_iort_pmcg *pmcg;
+
+ /* Retrieve PMCG specific data */
+ pmcg = (struct acpi_iort_pmcg *)node->node_data;
+
+ /*
+ * There are always 2 memory resources.
+ * If the overflow_gsiv is present then add that for a total of 3.
+ */
+ return pmcg->overflow_gsiv ? 3 : 2;
+}
+
+static void __init arm_smmu_v3_pmcg_init_resources(struct resource *res,
+ struct acpi_iort_node *node)
+{
+ struct acpi_iort_pmcg *pmcg;
+
+ /* Retrieve PMCG specific data */
+ pmcg = (struct acpi_iort_pmcg *)node->node_data;
+
+ res[0].start = pmcg->page0_base_address;
+ res[0].end = pmcg->page0_base_address + SZ_4K - 1;
+ res[0].flags = IORESOURCE_MEM;
+ res[1].start = pmcg->page1_base_address;
+ res[1].end = pmcg->page1_base_address + SZ_4K - 1;
+ res[1].flags = IORESOURCE_MEM;
+
+ if (pmcg->overflow_gsiv)
+ acpi_iort_register_irq(pmcg->overflow_gsiv, "overflow",
+ ACPI_EDGE_SENSITIVE, &res[2]);
}

struct iort_dev_config {
const char *name;
int (*dev_init)(struct acpi_iort_node *node);
- bool (*dev_is_coherent)(struct acpi_iort_node *node);
+ void (*dev_dma_configure)(struct device *dev,
+ struct acpi_iort_node *node);
int (*dev_count_resources)(struct acpi_iort_node *node);
void (*dev_init_resources)(struct resource *res,
struct acpi_iort_node *node);
@@ -1322,7 +1378,7 @@ struct iort_dev_config {

static const struct iort_dev_config iort_arm_smmu_v3_cfg __initconst = {
.name = "arm-smmu-v3",
- .dev_is_coherent = arm_smmu_v3_is_coherent,
+ .dev_dma_configure = arm_smmu_v3_dma_configure,
.dev_count_resources = arm_smmu_v3_count_resources,
.dev_init_resources = arm_smmu_v3_init_resources,
.dev_set_proximity = arm_smmu_v3_set_proximity,
@@ -1330,19 +1386,28 @@ static const struct iort_dev_config iort_arm_smmu_v3_cfg __initconst = {

static const struct iort_dev_config iort_arm_smmu_cfg __initconst = {
.name = "arm-smmu",
- .dev_is_coherent = arm_smmu_is_coherent,
+ .dev_dma_configure = arm_smmu_dma_configure,
.dev_count_resources = arm_smmu_count_resources,
- .dev_init_resources = arm_smmu_init_resources
+ .dev_init_resources = arm_smmu_init_resources,
+};
+
+static const struct iort_dev_config iort_arm_smmu_v3_pmcg_cfg __initconst = {
+ .name = "arm-smmu-v3-pmu",
+ .dev_count_resources = arm_smmu_v3_pmcg_count_resources,
+ .dev_init_resources = arm_smmu_v3_pmcg_init_resources,
};

static __init const struct iort_dev_config *iort_get_dev_cfg(
struct acpi_iort_node *node)
{
+
switch (node->type) {
case ACPI_IORT_NODE_SMMU_V3:
return &iort_arm_smmu_v3_cfg;
case ACPI_IORT_NODE_SMMU:
return &iort_arm_smmu_cfg;
+ case ACPI_IORT_NODE_PMCG:
+ return &iort_arm_smmu_v3_pmcg_cfg;
default:
return NULL;
}
@@ -1360,7 +1425,6 @@ static int __init iort_add_platform_device(struct acpi_iort_node *node,
struct fwnode_handle *fwnode;
struct platform_device *pdev;
struct resource *r;
- enum dev_dma_attr attr;
int ret, count;

pdev = platform_device_alloc(ops->name, PLATFORM_DEVID_AUTO);
@@ -1398,12 +1462,6 @@ static int __init iort_add_platform_device(struct acpi_iort_node *node,
if (ret)
goto dev_put;

- /*
- * We expect the dma masks to be equivalent for
- * all SMMUs set-ups
- */
- pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
-
fwnode = iort_get_fwnode(node);

if (!fwnode) {
@@ -1413,11 +1471,8 @@ static int __init iort_add_platform_device(struct acpi_iort_node *node,

pdev->dev.fwnode = fwnode;

- attr = ops->dev_is_coherent && ops->dev_is_coherent(node) ?
- DEV_DMA_COHERENT : DEV_DMA_NON_COHERENT;
-
- /* Configure DMA for the page table walker */
- acpi_dma_configure(&pdev->dev, attr);
+ if (ops->dev_dma_configure)
+ ops->dev_dma_configure(&pdev->dev, node);

iort_set_device_domain(&pdev->dev, node);

--
2.7.4

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