Merge branch irq/stm32-exti-updates into irq/irqchip-next

* irq/stm32-exti-updates:
  : .
  : stm32-exti updates courtesy of Antonio Borneo:
  :
  : "This series address some code fix for irq-stm32-exti driver and
  : simplifies the table that remaps the interrupts from exti to gic."
  :
  : Also comes with an additional change to irq_chip_request_resources_parent(),
  : making it possible to omit the callback in hierarchies.
  : .
  irqchip/stm32-exti: Simplify irq description table
  irqchip/stm32-exti: Read event trigger type from event_trg register
  irqchip/stm32-exti: Tag emr register as undefined for stm32mp15
  irqchip/stm32-exti: Prevent illegal read due to unbounded DT value
  irqchip/stm32-exti: Fix irq_mask/irq_unmask for direct events
  irqchip/stm32-exti: Fix irq_set_affinity return value
  genirq: Don't return error on missing optional irq_request_resources()

Signed-off-by: Marc Zyngier <maz@kernel.org>

2 files changed, 126 insertions, 127 deletions

diff --git a/drivers/irqchip/irq-stm32-exti.c b/drivers/irqchip/irq-stm32-exti.c
index 9d18f47040eb..a73763d475f0 100644
--- a/drivers/irqchip/irq-stm32-exti.c
+++ b/drivers/irqchip/irq-stm32-exti.c
@@ -34,21 +34,15 @@ struct stm32_exti_bank {
 	u32 swier_ofst;
 	u32 rpr_ofst;
 	u32 fpr_ofst;
+	u32 trg_ofst;
 };
 
 #define UNDEF_REG ~0
 
-struct stm32_desc_irq {
-	u32 exti;
-	u32 irq_parent;
-	struct irq_chip *chip;
-};
-
 struct stm32_exti_drv_data {
 	const struct stm32_exti_bank **exti_banks;
-	const struct stm32_desc_irq *desc_irqs;
+	const u8 *desc_irqs;
 	u32 bank_nr;
-	u32 irq_nr;
 };
 
 struct stm32_exti_chip_data {
@@ -78,6 +72,7 @@ static const struct stm32_exti_bank stm32f4xx_exti_b1 = {
 	.swier_ofst	= 0x10,
 	.rpr_ofst	= 0x14,
 	.fpr_ofst	= UNDEF_REG,
+	.trg_ofst	= UNDEF_REG,
 };
 
 static const struct stm32_exti_bank *stm32f4xx_exti_banks[] = {
@@ -97,6 +92,7 @@ static const struct stm32_exti_bank stm32h7xx_exti_b1 = {
 	.swier_ofst	= 0x08,
 	.rpr_ofst	= 0x88,
 	.fpr_ofst	= UNDEF_REG,
+	.trg_ofst	= UNDEF_REG,
 };
 
 static const struct stm32_exti_bank stm32h7xx_exti_b2 = {
@@ -107,6 +103,7 @@ static const struct stm32_exti_bank stm32h7xx_exti_b2 = {
 	.swier_ofst	= 0x28,
 	.rpr_ofst	= 0x98,
 	.fpr_ofst	= UNDEF_REG,
+	.trg_ofst	= UNDEF_REG,
 };
 
 static const struct stm32_exti_bank stm32h7xx_exti_b3 = {
@@ -117,6 +114,7 @@ static const struct stm32_exti_bank stm32h7xx_exti_b3 = {
 	.swier_ofst	= 0x48,
 	.rpr_ofst	= 0xA8,
 	.fpr_ofst	= UNDEF_REG,
+	.trg_ofst	= UNDEF_REG,
 };
 
 static const struct stm32_exti_bank *stm32h7xx_exti_banks[] = {
@@ -132,32 +130,35 @@ static const struct stm32_exti_drv_data stm32h7xx_drv_data = {
 
 static const struct stm32_exti_bank stm32mp1_exti_b1 = {
 	.imr_ofst	= 0x80,
-	.emr_ofst	= 0x84,
+	.emr_ofst	= UNDEF_REG,
 	.rtsr_ofst	= 0x00,
 	.ftsr_ofst	= 0x04,
 	.swier_ofst	= 0x08,
 	.rpr_ofst	= 0x0C,
 	.fpr_ofst	= 0x10,
+	.trg_ofst	= 0x3EC,
 };
 
 static const struct stm32_exti_bank stm32mp1_exti_b2 = {
 	.imr_ofst	= 0x90,
-	.emr_ofst	= 0x94,
+	.emr_ofst	= UNDEF_REG,
 	.rtsr_ofst	= 0x20,
 	.ftsr_ofst	= 0x24,
 	.swier_ofst	= 0x28,
 	.rpr_ofst	= 0x2C,
 	.fpr_ofst	= 0x30,
+	.trg_ofst	= 0x3E8,
 };
 
 static const struct stm32_exti_bank stm32mp1_exti_b3 = {
 	.imr_ofst	= 0xA0,
-	.emr_ofst	= 0xA4,
+	.emr_ofst	= UNDEF_REG,
 	.rtsr_ofst	= 0x40,
 	.ftsr_ofst	= 0x44,
 	.swier_ofst	= 0x48,
 	.rpr_ofst	= 0x4C,
 	.fpr_ofst	= 0x50,
+	.trg_ofst	= 0x3E4,
 };
 
 static const struct stm32_exti_bank *stm32mp1_exti_banks[] = {
@@ -169,126 +170,114 @@ static const struct stm32_exti_bank *stm32mp1_exti_banks[] = {
 static struct irq_chip stm32_exti_h_chip;
 static struct irq_chip stm32_exti_h_chip_direct;
 
-static const struct stm32_desc_irq stm32mp1_desc_irq[] = {
-	{ .exti = 0, .irq_parent = 6, .chip = &stm32_exti_h_chip },
-	{ .exti = 1, .irq_parent = 7, .chip = &stm32_exti_h_chip },
-	{ .exti = 2, .irq_parent = 8, .chip = &stm32_exti_h_chip },
-	{ .exti = 3, .irq_parent = 9, .chip = &stm32_exti_h_chip },
-	{ .exti = 4, .irq_parent = 10, .chip = &stm32_exti_h_chip },
-	{ .exti = 5, .irq_parent = 23, .chip = &stm32_exti_h_chip },
-	{ .exti = 6, .irq_parent = 64, .chip = &stm32_exti_h_chip },
-	{ .exti = 7, .irq_parent = 65, .chip = &stm32_exti_h_chip },
-	{ .exti = 8, .irq_parent = 66, .chip = &stm32_exti_h_chip },
-	{ .exti = 9, .irq_parent = 67, .chip = &stm32_exti_h_chip },
-	{ .exti = 10, .irq_parent = 40, .chip = &stm32_exti_h_chip },
-	{ .exti = 11, .irq_parent = 42, .chip = &stm32_exti_h_chip },
-	{ .exti = 12, .irq_parent = 76, .chip = &stm32_exti_h_chip },
-	{ .exti = 13, .irq_parent = 77, .chip = &stm32_exti_h_chip },
-	{ .exti = 14, .irq_parent = 121, .chip = &stm32_exti_h_chip },
-	{ .exti = 15, .irq_parent = 127, .chip = &stm32_exti_h_chip },
-	{ .exti = 16, .irq_parent = 1, .chip = &stm32_exti_h_chip },
-	{ .exti = 19, .irq_parent = 3, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 21, .irq_parent = 31, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 22, .irq_parent = 33, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 23, .irq_parent = 72, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 24, .irq_parent = 95, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 25, .irq_parent = 107, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 26, .irq_parent = 37, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 27, .irq_parent = 38, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 28, .irq_parent = 39, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 29, .irq_parent = 71, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 30, .irq_parent = 52, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 31, .irq_parent = 53, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 32, .irq_parent = 82, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 33, .irq_parent = 83, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 47, .irq_parent = 93, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 48, .irq_parent = 138, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 50, .irq_parent = 139, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 52, .irq_parent = 140, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 53, .irq_parent = 141, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 54, .irq_parent = 135, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 61, .irq_parent = 100, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 65, .irq_parent = 144, .chip = &stm32_exti_h_chip },
-	{ .exti = 68, .irq_parent = 143, .chip = &stm32_exti_h_chip },
-	{ .exti = 70, .irq_parent = 62, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 73, .irq_parent = 129, .chip = &stm32_exti_h_chip },
+#define EXTI_INVALID_IRQ       U8_MAX
+#define STM32MP1_DESC_IRQ_SIZE (ARRAY_SIZE(stm32mp1_exti_banks) * IRQS_PER_BANK)
+
+static const u8 stm32mp1_desc_irq[] = {
+	/* default value */
+	[0 ... (STM32MP1_DESC_IRQ_SIZE - 1)] = EXTI_INVALID_IRQ,
+
+	[0] = 6,
+	[1] = 7,
+	[2] = 8,
+	[3] = 9,
+	[4] = 10,
+	[5] = 23,
+	[6] = 64,
+	[7] = 65,
+	[8] = 66,
+	[9] = 67,
+	[10] = 40,
+	[11] = 42,
+	[12] = 76,
+	[13] = 77,
+	[14] = 121,
+	[15] = 127,
+	[16] = 1,
+	[19] = 3,
+	[21] = 31,
+	[22] = 33,
+	[23] = 72,
+	[24] = 95,
+	[25] = 107,
+	[26] = 37,
+	[27] = 38,
+	[28] = 39,
+	[29] = 71,
+	[30] = 52,
+	[31] = 53,
+	[32] = 82,
+	[33] = 83,
+	[47] = 93,
+	[48] = 138,
+	[50] = 139,
+	[52] = 140,
+	[53] = 141,
+	[54] = 135,
+	[61] = 100,
+	[65] = 144,
+	[68] = 143,
+	[70] = 62,
+	[73] = 129,
 };
 
-static const struct stm32_desc_irq stm32mp13_desc_irq[] = {
-	{ .exti = 0, .irq_parent = 6, .chip = &stm32_exti_h_chip },
-	{ .exti = 1, .irq_parent = 7, .chip = &stm32_exti_h_chip },
-	{ .exti = 2, .irq_parent = 8, .chip = &stm32_exti_h_chip },
-	{ .exti = 3, .irq_parent = 9, .chip = &stm32_exti_h_chip },
-	{ .exti = 4, .irq_parent = 10, .chip = &stm32_exti_h_chip },
-	{ .exti = 5, .irq_parent = 24, .chip = &stm32_exti_h_chip },
-	{ .exti = 6, .irq_parent = 65, .chip = &stm32_exti_h_chip },
-	{ .exti = 7, .irq_parent = 66, .chip = &stm32_exti_h_chip },
-	{ .exti = 8, .irq_parent = 67, .chip = &stm32_exti_h_chip },
-	{ .exti = 9, .irq_parent = 68, .chip = &stm32_exti_h_chip },
-	{ .exti = 10, .irq_parent = 41, .chip = &stm32_exti_h_chip },
-	{ .exti = 11, .irq_parent = 43, .chip = &stm32_exti_h_chip },
-	{ .exti = 12, .irq_parent = 77, .chip = &stm32_exti_h_chip },
-	{ .exti = 13, .irq_parent = 78, .chip = &stm32_exti_h_chip },
-	{ .exti = 14, .irq_parent = 106, .chip = &stm32_exti_h_chip },
-	{ .exti = 15, .irq_parent = 109, .chip = &stm32_exti_h_chip },
-	{ .exti = 16, .irq_parent = 1, .chip = &stm32_exti_h_chip },
-	{ .exti = 19, .irq_parent = 3, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 21, .irq_parent = 32, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 22, .irq_parent = 34, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 23, .irq_parent = 73, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 24, .irq_parent = 93, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 25, .irq_parent = 114, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 26, .irq_parent = 38, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 27, .irq_parent = 39, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 28, .irq_parent = 40, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 29, .irq_parent = 72, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 30, .irq_parent = 53, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 31, .irq_parent = 54, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 32, .irq_parent = 83, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 33, .irq_parent = 84, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 44, .irq_parent = 96, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 47, .irq_parent = 92, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 48, .irq_parent = 116, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 50, .irq_parent = 117, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 52, .irq_parent = 118, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 53, .irq_parent = 119, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 68, .irq_parent = 63, .chip = &stm32_exti_h_chip_direct },
-	{ .exti = 70, .irq_parent = 98, .chip = &stm32_exti_h_chip_direct },
+static const u8 stm32mp13_desc_irq[] = {
+	/* default value */
+	[0 ... (STM32MP1_DESC_IRQ_SIZE - 1)] = EXTI_INVALID_IRQ,
+
+	[0] = 6,
+	[1] = 7,
+	[2] = 8,
+	[3] = 9,
+	[4] = 10,
+	[5] = 24,
+	[6] = 65,
+	[7] = 66,
+	[8] = 67,
+	[9] = 68,
+	[10] = 41,
+	[11] = 43,
+	[12] = 77,
+	[13] = 78,
+	[14] = 106,
+	[15] = 109,
+	[16] = 1,
+	[19] = 3,
+	[21] = 32,
+	[22] = 34,
+	[23] = 73,
+	[24] = 93,
+	[25] = 114,
+	[26] = 38,
+	[27] = 39,
+	[28] = 40,
+	[29] = 72,
+	[30] = 53,
+	[31] = 54,
+	[32] = 83,
+	[33] = 84,
+	[44] = 96,
+	[47] = 92,
+	[48] = 116,
+	[50] = 117,
+	[52] = 118,
+	[53] = 119,
+	[68] = 63,
+	[70] = 98,
 };
 
 static const struct stm32_exti_drv_data stm32mp1_drv_data = {
 	.exti_banks = stm32mp1_exti_banks,
 	.bank_nr = ARRAY_SIZE(stm32mp1_exti_banks),
 	.desc_irqs = stm32mp1_desc_irq,
-	.irq_nr = ARRAY_SIZE(stm32mp1_desc_irq),
 };
 
 static const struct stm32_exti_drv_data stm32mp13_drv_data = {
 	.exti_banks = stm32mp1_exti_banks,
 	.bank_nr = ARRAY_SIZE(stm32mp1_exti_banks),
 	.desc_irqs = stm32mp13_desc_irq,
-	.irq_nr = ARRAY_SIZE(stm32mp13_desc_irq),
 };
 
-static const struct
-stm32_desc_irq *stm32_exti_get_desc(const struct stm32_exti_drv_data *drv_data,
-				    irq_hw_number_t hwirq)
-{
-	const struct stm32_desc_irq *desc = NULL;
-	int i;
-
-	if (!drv_data->desc_irqs)
-		return NULL;
-
-	for (i = 0; i < drv_data->irq_nr; i++) {
-		desc = &drv_data->desc_irqs[i];
-		if (desc->exti == hwirq)
-			break;
-	}
-
-	return desc;
-}
-
 static unsigned long stm32_exti_pending(struct irq_chip_generic *gc)
 {
 	struct stm32_exti_chip_data *chip_data = gc->private;
@@ -614,7 +603,7 @@ static int stm32_exti_h_set_affinity(struct irq_data *d,
 	if (d->parent_data->chip)
 		return irq_chip_set_affinity_parent(d, dest, force);
 
-	return -EINVAL;
+	return IRQ_SET_MASK_OK_DONE;
 }
 
 static int __maybe_unused stm32_exti_h_suspend(void)
@@ -691,8 +680,8 @@ static struct irq_chip stm32_exti_h_chip_direct = {
 	.name			= "stm32-exti-h-direct",
 	.irq_eoi		= irq_chip_eoi_parent,
 	.irq_ack		= irq_chip_ack_parent,
-	.irq_mask		= irq_chip_mask_parent,
-	.irq_unmask		= irq_chip_unmask_parent,
+	.irq_mask		= stm32_exti_h_mask,
+	.irq_unmask		= stm32_exti_h_unmask,
 	.irq_retrigger		= irq_chip_retrigger_hierarchy,
 	.irq_set_type		= irq_chip_set_type_parent,
 	.irq_set_wake		= stm32_exti_h_set_wake,
@@ -706,28 +695,36 @@ static int stm32_exti_h_domain_alloc(struct irq_domain *dm,
 {
 	struct stm32_exti_host_data *host_data = dm->host_data;
 	struct stm32_exti_chip_data *chip_data;
-	const struct stm32_desc_irq *desc;
+	u8 desc_irq;
 	struct irq_fwspec *fwspec = data;
 	struct irq_fwspec p_fwspec;
 	irq_hw_number_t hwirq;
 	int bank;
+	u32 event_trg;
+	struct irq_chip *chip;
 
 	hwirq = fwspec->param[0];
+	if (hwirq >= host_data->drv_data->bank_nr * IRQS_PER_BANK)
+		return -EINVAL;
+
 	bank  = hwirq / IRQS_PER_BANK;
 	chip_data = &host_data->chips_data[bank];
 
+	event_trg = readl_relaxed(host_data->base + chip_data->reg_bank->trg_ofst);
+	chip = (event_trg & BIT(hwirq % IRQS_PER_BANK)) ?
+	       &stm32_exti_h_chip : &stm32_exti_h_chip_direct;
+
+	irq_domain_set_hwirq_and_chip(dm, virq, hwirq, chip, chip_data);
 
-	desc = stm32_exti_get_desc(host_data->drv_data, hwirq);
-	if (!desc)
+	if (!host_data->drv_data || !host_data->drv_data->desc_irqs)
 		return -EINVAL;
 
-	irq_domain_set_hwirq_and_chip(dm, virq, hwirq, desc->chip,
-				      chip_data);
-	if (desc->irq_parent) {
+	desc_irq = host_data->drv_data->desc_irqs[hwirq];
+	if (desc_irq != EXTI_INVALID_IRQ) {
 		p_fwspec.fwnode = dm->parent->fwnode;
 		p_fwspec.param_count = 3;
 		p_fwspec.param[0] = GIC_SPI;
-		p_fwspec.param[1] = desc->irq_parent;
+		p_fwspec.param[1] = desc_irq;
 		p_fwspec.param[2] = IRQ_TYPE_LEVEL_HIGH;
 
 		return irq_domain_alloc_irqs_parent(dm, virq, 1, &p_fwspec);
@@ -792,7 +789,8 @@ stm32_exti_chip_data *stm32_exti_chip_init(struct stm32_exti_host_data *h_data,
 	 * clear registers to avoid residue
 	 */
 	writel_relaxed(0, base + stm32_bank->imr_ofst);
-	writel_relaxed(0, base + stm32_bank->emr_ofst);
+	if (stm32_bank->emr_ofst != UNDEF_REG)
+		writel_relaxed(0, base + stm32_bank->emr_ofst);
 
 	pr_info("%pOF: bank%d\n", node, bank_idx);
 
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 886789dcee43..c19040530789 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -1516,7 +1516,8 @@ int irq_chip_request_resources_parent(struct irq_data *data)
 	if (data->chip->irq_request_resources)
 		return data->chip->irq_request_resources(data);
 
-	return -ENOSYS;
+	/* no error on missing optional irq_chip::irq_request_resources */
+	return 0;
 }
 EXPORT_SYMBOL_GPL(irq_chip_request_resources_parent);