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Subject[PATCH V13 07/13] irqchip/loongson-pch-msi: Add ACPI init support
Date
From: Huacai Chen <chenhuacai@loongson.cn>

We are preparing to add new Loongson (based on LoongArch, not compatible
with old MIPS-based Loongson) support. LoongArch use ACPI other than DT
as its boot protocol, so add ACPI init support.

PCH-PIC/PCH-MSI stands for "Interrupt Controller" that described in
Section 5 of "Loongson 7A1000 Bridge User Manual". For more information
please refer Documentation/loongarch/irq-chip-model.rst.

For systems with two chipsets, there are two related msi irqdomains,
each of which has the same node id as its parent irqdomain. So we
use a structure to mantain the relation of node and it's parent
irqdomain as pch irqdomin, and add a pci_segment field to it for
matching the pci segment of a pci device when setting msi irqdomain
for the device.

struct acpi_vector_group {
int node;
int pci_segment;
struct irq_domain *parent;
};

The field 'pci_segment' and 'node' are initialized from MCFG, and
the parent irqdomain will set field 'parent' by matching same
'node'.

Co-developed-by: Jianmin Lv <lvjianmin@loongson.cn>
Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
arch/loongarch/include/asm/irq.h | 7 +-
arch/loongarch/kernel/irq.c | 30 ++++++-
drivers/irqchip/irq-loongson-pch-msi.c | 147 +++++++++++++++++++++++----------
3 files changed, 138 insertions(+), 46 deletions(-)

diff --git a/arch/loongarch/include/asm/irq.h b/arch/loongarch/include/asm/irq.h
index a444dc6..367aa44 100644
--- a/arch/loongarch/include/asm/irq.h
+++ b/arch/loongarch/include/asm/irq.h
@@ -50,9 +50,11 @@ static inline bool on_irq_stack(int cpu, unsigned long sp)

struct acpi_vector_group {
int node;
+ int pci_segment;
struct irq_domain *parent;
};
extern struct acpi_vector_group pch_group[MAX_IO_PICS];
+extern struct acpi_vector_group msi_group[MAX_IO_PICS];

#define CORES_PER_EIO_NODE 4

@@ -112,9 +114,8 @@ struct irq_domain *htvec_acpi_init(struct irq_domain *parent,
struct acpi_madt_ht_pic *acpi_htvec);
int pch_lpc_acpi_init(struct irq_domain *parent,
struct acpi_madt_lpc_pic *acpi_pchlpc);
-struct irq_domain *pch_msi_acpi_init(struct irq_domain *parent,
- struct acpi_madt_msi_pic *acpi_pchmsi);
int find_pch_pic(u32 gsi);
+struct fwnode_handle *get_pch_msi_handle(int pci_segment);

extern struct acpi_madt_lio_pic *acpi_liointc;
extern struct acpi_madt_eio_pic *acpi_eiointc[MAX_IO_PICS];
@@ -127,7 +128,7 @@ struct irq_domain *pch_msi_acpi_init(struct irq_domain *parent,
extern struct irq_domain *cpu_domain;
extern struct irq_domain *liointc_domain;
extern struct fwnode_handle *pch_lpc_handle;
-extern struct irq_domain *pch_msi_domain[MAX_IO_PICS];
+extern struct fwnode_handle *pch_msi_handle[MAX_IO_PICS];
extern struct fwnode_handle *pch_pic_handle[MAX_IO_PICS];

extern irqreturn_t loongson3_ipi_interrupt(int irq, void *dev);
diff --git a/arch/loongarch/kernel/irq.c b/arch/loongarch/kernel/irq.c
index f2115be..82bc6c7 100644
--- a/arch/loongarch/kernel/irq.c
+++ b/arch/loongarch/kernel/irq.c
@@ -27,8 +27,8 @@

struct irq_domain *cpu_domain;
struct irq_domain *liointc_domain;
-struct irq_domain *pch_msi_domain[MAX_IO_PICS];
struct acpi_vector_group pch_group[MAX_IO_PICS];
+struct acpi_vector_group msi_group[MAX_IO_PICS];

/*
* 'what should we do if we get a hw irq event on an illegal vector'.
@@ -55,6 +55,33 @@ int arch_show_interrupts(struct seq_file *p, int prec)
return 0;
}

+static int early_pci_mcfg_parse(struct acpi_table_header *header)
+{
+ struct acpi_table_mcfg *mcfg;
+ struct acpi_mcfg_allocation *mptr;
+ int i, n;
+
+ if (header->length < sizeof(struct acpi_table_mcfg))
+ return -EINVAL;
+
+ n = (header->length - sizeof(struct acpi_table_mcfg)) /
+ sizeof(struct acpi_mcfg_allocation);
+ mcfg = (struct acpi_table_mcfg *)header;
+ mptr = (struct acpi_mcfg_allocation *) &mcfg[1];
+
+ for (i = 0; i < n; i++, mptr++) {
+ msi_group[i].pci_segment = mptr->pci_segment;
+ msi_group[i].node = (mptr->address >> 44) & 0xf;
+ }
+
+ return 0;
+}
+
+void __init init_msi_parent_group(void)
+{
+ acpi_table_parse(ACPI_SIG_MCFG, early_pci_mcfg_parse);
+}
+
void __init init_IRQ(void)
{
int i;
@@ -68,6 +95,7 @@ void __init init_IRQ(void)
clear_csr_ecfg(ECFG0_IM);
clear_csr_estat(ESTATF_IP);

+ init_msi_parent_group();
irqchip_init();
#ifdef CONFIG_SMP
ipi_irq = EXCCODE_IPI - EXCCODE_INT_START;
diff --git a/drivers/irqchip/irq-loongson-pch-msi.c b/drivers/irqchip/irq-loongson-pch-msi.c
index e3801c4..5db4a68 100644
--- a/drivers/irqchip/irq-loongson-pch-msi.c
+++ b/drivers/irqchip/irq-loongson-pch-msi.c
@@ -15,14 +15,30 @@
#include <linux/pci.h>
#include <linux/slab.h>

+static int nr_pics;
+
struct pch_msi_data {
struct mutex msi_map_lock;
phys_addr_t doorbell;
u32 irq_first; /* The vector number that MSIs starts */
u32 num_irqs; /* The number of vectors for MSIs */
unsigned long *msi_map;
+ struct fwnode_handle *domain_handle;
};

+static struct pch_msi_data *pch_msi_priv[2];
+
+struct fwnode_handle *get_pch_msi_handle(int pci_segment)
+{
+ int i;
+
+ for (i = 0; i < MAX_IO_PICS; i++) {
+ if (msi_group[i].pci_segment == pci_segment)
+ return pch_msi_priv[i]->domain_handle;
+ }
+ return NULL;
+}
+
static void pch_msi_mask_msi_irq(struct irq_data *d)
{
pci_msi_mask_irq(d);
@@ -154,12 +170,14 @@ static void pch_msi_middle_domain_free(struct irq_domain *domain,
};

static int pch_msi_init_domains(struct pch_msi_data *priv,
- struct device_node *node,
- struct irq_domain *parent)
+ struct irq_domain *parent,
+ struct fwnode_handle *domain_handle)
{
struct irq_domain *middle_domain, *msi_domain;

- middle_domain = irq_domain_create_linear(of_node_to_fwnode(node),
+ priv->domain_handle = domain_handle;
+
+ middle_domain = irq_domain_create_linear(priv->domain_handle,
priv->num_irqs,
&pch_msi_middle_domain_ops,
priv);
@@ -171,7 +189,7 @@ static int pch_msi_init_domains(struct pch_msi_data *priv,
middle_domain->parent = parent;
irq_domain_update_bus_token(middle_domain, DOMAIN_BUS_NEXUS);

- msi_domain = pci_msi_create_irq_domain(of_node_to_fwnode(node),
+ msi_domain = pci_msi_create_irq_domain(priv->domain_handle,
&pch_msi_domain_info,
middle_domain);
if (!msi_domain) {
@@ -183,19 +201,11 @@ static int pch_msi_init_domains(struct pch_msi_data *priv,
return 0;
}

-static int pch_msi_init(struct device_node *node,
- struct device_node *parent)
+static int pch_msi_init(phys_addr_t msg_address, int irq_base, int irq_count,
+ struct irq_domain *parent_domain, struct fwnode_handle *domain_handle)
{
- struct pch_msi_data *priv;
- struct irq_domain *parent_domain;
- struct resource res;
int ret;
-
- parent_domain = irq_find_host(parent);
- if (!parent_domain) {
- pr_err("Failed to find the parent domain\n");
- return -ENXIO;
- }
+ struct pch_msi_data *priv;

priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -203,48 +213,101 @@ static int pch_msi_init(struct device_node *node,

mutex_init(&priv->msi_map_lock);

- ret = of_address_to_resource(node, 0, &res);
- if (ret) {
- pr_err("Failed to allocate resource\n");
- goto err_priv;
- }
-
- priv->doorbell = res.start;
-
- if (of_property_read_u32(node, "loongson,msi-base-vec",
- &priv->irq_first)) {
- pr_err("Unable to parse MSI vec base\n");
- ret = -EINVAL;
- goto err_priv;
- }
-
- if (of_property_read_u32(node, "loongson,msi-num-vecs",
- &priv->num_irqs)) {
- pr_err("Unable to parse MSI vec number\n");
- ret = -EINVAL;
- goto err_priv;
- }
+ priv->doorbell = msg_address;
+ priv->irq_first = irq_base;
+ priv->num_irqs = irq_count;

priv->msi_map = bitmap_zalloc(priv->num_irqs, GFP_KERNEL);
- if (!priv->msi_map) {
- ret = -ENOMEM;
+ if (!priv->msi_map)
goto err_priv;
- }

pr_debug("Registering %d MSIs, starting at %d\n",
priv->num_irqs, priv->irq_first);

- ret = pch_msi_init_domains(priv, node, parent_domain);
+ ret = pch_msi_init_domains(priv, parent_domain, domain_handle);
if (ret)
goto err_map;

+ pch_msi_priv[nr_pics++] = priv;
return 0;

err_map:
bitmap_free(priv->msi_map);
err_priv:
kfree(priv);
- return ret;
+
+ return -EINVAL;
}

-IRQCHIP_DECLARE(pch_msi, "loongson,pch-msi-1.0", pch_msi_init);
+#ifdef CONFIG_OF
+
+static int pch_msi_of_init(struct device_node *node, struct device_node *parent)
+{
+ int err;
+ int irq_base, irq_count;
+ struct resource res;
+ struct irq_domain *parent_domain;
+
+ parent_domain = irq_find_host(parent);
+ if (!parent_domain) {
+ pr_err("Failed to find the parent domain\n");
+ return -ENXIO;
+ }
+
+ if (of_address_to_resource(node, 0, &res)) {
+ pr_err("Failed to allocate resource\n");
+ return -EINVAL;
+ }
+
+ if (of_property_read_u32(node, "loongson,msi-base-vec", &irq_base)) {
+ pr_err("Unable to parse MSI vec base\n");
+ return -EINVAL;
+ }
+
+ if (of_property_read_u32(node, "loongson,msi-num-vecs", &irq_count)) {
+ pr_err("Unable to parse MSI vec number\n");
+ return -EINVAL;
+ }
+
+ err = pch_msi_init(res.start, irq_base, irq_count, parent_domain, of_node_to_fwnode(node));
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+IRQCHIP_DECLARE(pch_msi, "loongson,pch-msi-1.0", pch_msi_of_init);
+
+#endif
+
+#ifdef CONFIG_ACPI
+int __init pch_msi_init_irqdomain(struct irq_domain *parent,
+ struct acpi_madt_msi_pic *acpi_pchmsi)
+{
+ struct fwnode_handle *domain_handle;
+
+ if (!acpi_pchmsi)
+ return -EINVAL;
+
+ domain_handle = irq_domain_alloc_fwnode((phys_addr_t *)acpi_pchmsi);
+
+ return pch_msi_init(acpi_pchmsi->msg_address, acpi_pchmsi->start,
+ acpi_pchmsi->count, parent, domain_handle);
+}
+static int __init msiintc_parse_madt(union acpi_subtable_headers *header,
+ const unsigned long end)
+{
+ struct acpi_madt_msi_pic *pch_msi_entry = (struct acpi_madt_msi_pic *)header;
+
+ return pch_msi_init_irqdomain(msi_group[nr_pics].parent, pch_msi_entry);
+}
+
+static int __init pch_msi_acpi_init(void)
+{
+ acpi_table_parse_madt(ACPI_MADT_TYPE_MSI_PIC,
+ msiintc_parse_madt, 0);
+
+ return 0;
+}
+early_initcall(pch_msi_acpi_init);
+#endif
--
1.8.3.1
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