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Date: Thu, 24 Jan 2019 17:31:23 +0000
From: Robin Murphy <robin.murphy@....com>
To: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
lorenzo.pieralisi@....com
Cc: jean-philippe.brucker@....com, will.deacon@....com,
mark.rutland@....com, guohanjun@...wei.com, john.garry@...wei.com,
pabba@...eaurora.org, vkilari@...eaurora.org,
rruigrok@...eaurora.org, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linuxarm@...wei.com, neil.m.leeder@...il.com
Subject: Re: [PATCH v5 1/4] acpi: arm64: add iort support for PMCG
On 30/11/2018 15:47, Shameer Kolothum wrote:
> From: Neil Leeder <nleeder@...eaurora.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@...eaurora.org>
> Signed-off-by: Hanjun Guo <guohanjun@...wei.com>
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@...wei.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 2a361e2..2da08e1 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",
Nit: s/pmu/pmcg/ for consistency, I think.
> + .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)
> {
> +
Nit: spurious newline.
Otherwise,
Reviewed-by: Robin Murphy <robin.murphy@....com>
> 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);
>
>
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