[linux-block.git] / arch / powerpc / sysdev / xics / ics-rtas.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/cpu.h>
#include <linux/of.h>
#include <linux/spinlock.h>
#include <linux/msi.h>

#include <asm/prom.h>
#include <asm/smp.h>
#include <asm/machdep.h>
#include <asm/irq.h>
#include <asm/errno.h>
#include <asm/xics.h>
#include <asm/rtas.h>

/* RTAS service tokens */
static int ibm_get_xive;
static int ibm_set_xive;
static int ibm_int_on;
static int ibm_int_off;

static int ics_rtas_map(struct ics *ics, unsigned int virq);
static void ics_rtas_mask_unknown(struct ics *ics, unsigned long vec);
static long ics_rtas_get_server(struct ics *ics, unsigned long vec);
static int ics_rtas_host_match(struct ics *ics, struct device_node *node);

/* Only one global & state struct ics */
static struct ics ics_rtas = {
	.map		= ics_rtas_map,
	.mask_unknown	= ics_rtas_mask_unknown,
	.get_server	= ics_rtas_get_server,
	.host_match	= ics_rtas_host_match,
};

static void ics_rtas_unmask_irq(struct irq_data *d)
{
	unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
	int call_status;
	int server;

	pr_devel("xics: unmask virq %d [hw 0x%x]\n", d->irq, hw_irq);

	if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS)
		return;

	server = xics_get_irq_server(d->irq, irq_data_get_affinity_mask(d), 0);

	call_status = rtas_call(ibm_set_xive, 3, 1, NULL, hw_irq, server,
				DEFAULT_PRIORITY);
	if (call_status != 0) {
		printk(KERN_ERR
			"%s: ibm_set_xive irq %u server %x returned %d\n",
			__func__, hw_irq, server, call_status);
		return;
	}

	/* Now unmask the interrupt (often a no-op) */
	call_status = rtas_call(ibm_int_on, 1, 1, NULL, hw_irq);
	if (call_status != 0) {
		printk(KERN_ERR "%s: ibm_int_on irq=%u returned %d\n",
			__func__, hw_irq, call_status);
		return;
	}
}

static unsigned int ics_rtas_startup(struct irq_data *d)
{
#ifdef CONFIG_PCI_MSI
	/*
	 * The generic MSI code returns with the interrupt disabled on the
	 * card, using the MSI mask bits. Firmware doesn't appear to unmask
	 * at that level, so we do it here by hand.
	 */
	if (irq_data_get_msi_desc(d))
		pci_msi_unmask_irq(d);
#endif
	/* unmask it */
	ics_rtas_unmask_irq(d);
	return 0;
}

static void ics_rtas_mask_real_irq(unsigned int hw_irq)
{
	int call_status;

	if (hw_irq == XICS_IPI)
		return;

	call_status = rtas_call(ibm_int_off, 1, 1, NULL, hw_irq);
	if (call_status != 0) {
		printk(KERN_ERR "%s: ibm_int_off irq=%u returned %d\n",
			__func__, hw_irq, call_status);
		return;
	}

	/* Have to set XIVE to 0xff to be able to remove a slot */
	call_status = rtas_call(ibm_set_xive, 3, 1, NULL, hw_irq,
				xics_default_server, 0xff);
	if (call_status != 0) {
		printk(KERN_ERR "%s: ibm_set_xive(0xff) irq=%u returned %d\n",
			__func__, hw_irq, call_status);
		return;
	}
}

static void ics_rtas_mask_irq(struct irq_data *d)
{
	unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);

	pr_devel("xics: mask virq %d [hw 0x%x]\n", d->irq, hw_irq);

	if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS)
		return;
	ics_rtas_mask_real_irq(hw_irq);
}

static int ics_rtas_set_affinity(struct irq_data *d,
				 const struct cpumask *cpumask,
				 bool force)
{
	unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
	int status;
	int xics_status[2];
	int irq_server;

	if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS)
		return -1;

	status = rtas_call(ibm_get_xive, 1, 3, xics_status, hw_irq);

	if (status) {
		printk(KERN_ERR "%s: ibm,get-xive irq=%u returns %d\n",
			__func__, hw_irq, status);
		return -1;
	}

	irq_server = xics_get_irq_server(d->irq, cpumask, 1);
	if (irq_server == -1) {
		pr_warning("%s: No online cpus in the mask %*pb for irq %d\n",
			   __func__, cpumask_pr_args(cpumask), d->irq);
		return -1;
	}

	status = rtas_call(ibm_set_xive, 3, 1, NULL,
			   hw_irq, irq_server, xics_status[1]);

	if (status) {
		printk(KERN_ERR "%s: ibm,set-xive irq=%u returns %d\n",
			__func__, hw_irq, status);
		return -1;
	}

	return IRQ_SET_MASK_OK;
}

static struct irq_chip ics_rtas_irq_chip = {
	.name = "XICS",
	.irq_startup = ics_rtas_startup,
	.irq_mask = ics_rtas_mask_irq,
	.irq_unmask = ics_rtas_unmask_irq,
	.irq_eoi = NULL, /* Patched at init time */
	.irq_set_affinity = ics_rtas_set_affinity,
	.irq_set_type = xics_set_irq_type,
	.irq_retrigger = xics_retrigger,
};

static int ics_rtas_map(struct ics *ics, unsigned int virq)
{
	unsigned int hw_irq = (unsigned int)virq_to_hw(virq);
	int status[2];
	int rc;

	if (WARN_ON(hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS))
		return -EINVAL;

	/* Check if RTAS knows about this interrupt */
	rc = rtas_call(ibm_get_xive, 1, 3, status, hw_irq);
	if (rc)
		return -ENXIO;

	irq_set_chip_and_handler(virq, &ics_rtas_irq_chip, handle_fasteoi_irq);
	irq_set_chip_data(virq, &ics_rtas);

	return 0;
}

static void ics_rtas_mask_unknown(struct ics *ics, unsigned long vec)
{
	ics_rtas_mask_real_irq(vec);
}

static long ics_rtas_get_server(struct ics *ics, unsigned long vec)
{
	int rc, status[2];

	rc = rtas_call(ibm_get_xive, 1, 3, status, vec);
	if (rc)
		return -1;
	return status[0];
}

static int ics_rtas_host_match(struct ics *ics, struct device_node *node)
{
	/* IBM machines have interrupt parents of various funky types for things
	 * like vdevices, events, etc... The trick we use here is to match
	 * everything here except the legacy 8259 which is compatible "chrp,iic"
	 */
	return !of_device_is_compatible(node, "chrp,iic");
}

__init int ics_rtas_init(void)
{
	ibm_get_xive = rtas_token("ibm,get-xive");
	ibm_set_xive = rtas_token("ibm,set-xive");
	ibm_int_on  = rtas_token("ibm,int-on");
	ibm_int_off = rtas_token("ibm,int-off");

	/* We enable the RTAS "ICS" if RTAS is present with the
	 * appropriate tokens
	 */
	if (ibm_get_xive == RTAS_UNKNOWN_SERVICE ||
	    ibm_set_xive == RTAS_UNKNOWN_SERVICE)
		return -ENODEV;

	/* We need to patch our irq chip's EOI to point to the
	 * right ICP
	 */
	ics_rtas_irq_chip.irq_eoi = icp_ops->eoi;

	/* Register ourselves */
	xics_register_ics(&ics_rtas);

	return 0;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
0b05ac6e BH	2	#include <linux/types.h>
	3	#include <linux/kernel.h>
	4	#include <linux/irq.h>
	5	#include <linux/smp.h>
	6	#include <linux/interrupt.h>
	7	#include <linux/init.h>
	8	#include <linux/cpu.h>
	9	#include <linux/of.h>
	10	#include <linux/spinlock.h>
	11	#include <linux/msi.h>
	12
	13	#include <asm/prom.h>
	14	#include <asm/smp.h>
	15	#include <asm/machdep.h>
	16	#include <asm/irq.h>
	17	#include <asm/errno.h>
	18	#include <asm/xics.h>
	19	#include <asm/rtas.h>
	20
	21	/* RTAS service tokens */
	22	static int ibm_get_xive;
	23	static int ibm_set_xive;
	24	static int ibm_int_on;
	25	static int ibm_int_off;
	26
	27	static int ics_rtas_map(struct ics *ics, unsigned int virq);
	28	static void ics_rtas_mask_unknown(struct ics *ics, unsigned long vec);
	29	static long ics_rtas_get_server(struct ics *ics, unsigned long vec);
5ca12376	30	static int ics_rtas_host_match(struct ics ics, struct device_node node);
0b05ac6e BH	31
	32	/* Only one global & state struct ics */
	33	static struct ics ics_rtas = {
	34	.map = ics_rtas_map,
	35	.mask_unknown = ics_rtas_mask_unknown,
	36	.get_server = ics_rtas_get_server,
5ca12376	37	.host_match = ics_rtas_host_match,
0b05ac6e BH	38	};
	39
	40	static void ics_rtas_unmask_irq(struct irq_data *d)
	41	{
476eb491	42	unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
0b05ac6e BH	43	int call_status;
	44	int server;
	45
	46	pr_devel("xics: unmask virq %d [hw 0x%x]\n", d->irq, hw_irq);
	47
	48	if (hw_irq == XICS_IPI \|\| hw_irq == XICS_IRQ_SPURIOUS)
	49	return;
	50
da92b4eb	51	server = xics_get_irq_server(d->irq, irq_data_get_affinity_mask(d), 0);
0b05ac6e BH	52
	53	call_status = rtas_call(ibm_set_xive, 3, 1, NULL, hw_irq, server,
	54	DEFAULT_PRIORITY);
	55	if (call_status != 0) {
	56	printk(KERN_ERR
	57	"%s: ibm_set_xive irq %u server %x returned %d\n",
	58	__func__, hw_irq, server, call_status);
	59	return;
	60	}
	61
	62	/* Now unmask the interrupt (often a no-op) */
	63	call_status = rtas_call(ibm_int_on, 1, 1, NULL, hw_irq);
	64	if (call_status != 0) {
	65	printk(KERN_ERR "%s: ibm_int_on irq=%u returned %d\n",
	66	__func__, hw_irq, call_status);
	67	return;
	68	}
	69	}
	70
	71	static unsigned int ics_rtas_startup(struct irq_data *d)
	72	{
	73	#ifdef CONFIG_PCI_MSI
	74	/*
	75	* The generic MSI code returns with the interrupt disabled on the
	76	* card, using the MSI mask bits. Firmware doesn't appear to unmask
	77	* at that level, so we do it here by hand.
	78	*/
507a883e	79	if (irq_data_get_msi_desc(d))
280510f1	80	pci_msi_unmask_irq(d);
0b05ac6e BH	81	#endif
	82	/* unmask it */
	83	ics_rtas_unmask_irq(d);
	84	return 0;
	85	}
	86
	87	static void ics_rtas_mask_real_irq(unsigned int hw_irq)
	88	{
	89	int call_status;
	90
	91	if (hw_irq == XICS_IPI)
	92	return;
	93
	94	call_status = rtas_call(ibm_int_off, 1, 1, NULL, hw_irq);
	95	if (call_status != 0) {
	96	printk(KERN_ERR "%s: ibm_int_off irq=%u returned %d\n",
	97	__func__, hw_irq, call_status);
	98	return;
	99	}
	100
	101	/* Have to set XIVE to 0xff to be able to remove a slot */
	102	call_status = rtas_call(ibm_set_xive, 3, 1, NULL, hw_irq,
	103	xics_default_server, 0xff);
	104	if (call_status != 0) {
	105	printk(KERN_ERR "%s: ibm_set_xive(0xff) irq=%u returned %d\n",
	106	__func__, hw_irq, call_status);
	107	return;
	108	}
	109	}
	110
	111	static void ics_rtas_mask_irq(struct irq_data *d)
	112	{
476eb491	113	unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
0b05ac6e BH	114
	115	pr_devel("xics: mask virq %d [hw 0x%x]\n", d->irq, hw_irq);
	116
	117	if (hw_irq == XICS_IPI \|\| hw_irq == XICS_IRQ_SPURIOUS)
	118	return;
	119	ics_rtas_mask_real_irq(hw_irq);
	120	}
	121
	122	static int ics_rtas_set_affinity(struct irq_data *d,
	123	const struct cpumask *cpumask,
	124	bool force)
	125	{
476eb491	126	unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
0b05ac6e BH	127	int status;
	128	int xics_status[2];
	129	int irq_server;
	130
	131	if (hw_irq == XICS_IPI \|\| hw_irq == XICS_IRQ_SPURIOUS)
	132	return -1;
	133
	134	status = rtas_call(ibm_get_xive, 1, 3, xics_status, hw_irq);
	135
	136	if (status) {
	137	printk(KERN_ERR "%s: ibm,get-xive irq=%u returns %d\n",
	138	__func__, hw_irq, status);
	139	return -1;
	140	}
	141
	142	irq_server = xics_get_irq_server(d->irq, cpumask, 1);
	143	if (irq_server == -1) {
0c118b7b TH	144	pr_warning("%s: No online cpus in the mask %*pb for irq %d\n",
0c118b7b TH	145	__func__, cpumask_pr_args(cpumask), d->irq);
0b05ac6e BH	146	return -1;
	147	}
	148
	149	status = rtas_call(ibm_set_xive, 3, 1, NULL,
	150	hw_irq, irq_server, xics_status[1]);
	151
	152	if (status) {
	153	printk(KERN_ERR "%s: ibm,set-xive irq=%u returns %d\n",
	154	__func__, hw_irq, status);
	155	return -1;
	156	}
	157
	158	return IRQ_SET_MASK_OK;
	159	}
	160
	161	static struct irq_chip ics_rtas_irq_chip = {
	162	.name = "XICS",
	163	.irq_startup = ics_rtas_startup,
	164	.irq_mask = ics_rtas_mask_irq,
	165	.irq_unmask = ics_rtas_unmask_irq,
	166	.irq_eoi = NULL, /* Patched at init time */
880a3d6a BH	167	.irq_set_affinity = ics_rtas_set_affinity,
	168	.irq_set_type = xics_set_irq_type,
	169	.irq_retrigger = xics_retrigger,
0b05ac6e BH	170	};
	171
	172	static int ics_rtas_map(struct ics *ics, unsigned int virq)
	173	{
476eb491	174	unsigned int hw_irq = (unsigned int)virq_to_hw(virq);
0b05ac6e BH	175	int status[2];
	176	int rc;
	177
	178	if (WARN_ON(hw_irq == XICS_IPI \|\| hw_irq == XICS_IRQ_SPURIOUS))
	179	return -EINVAL;
	180
	181	/* Check if RTAS knows about this interrupt */
	182	rc = rtas_call(ibm_get_xive, 1, 3, status, hw_irq);
	183	if (rc)
	184	return -ENXIO;
	185
	186	irq_set_chip_and_handler(virq, &ics_rtas_irq_chip, handle_fasteoi_irq);
	187	irq_set_chip_data(virq, &ics_rtas);
	188
	189	return 0;
	190	}
	191
	192	static void ics_rtas_mask_unknown(struct ics *ics, unsigned long vec)
	193	{
	194	ics_rtas_mask_real_irq(vec);
	195	}
	196
	197	static long ics_rtas_get_server(struct ics *ics, unsigned long vec)
	198	{
	199	int rc, status[2];
	200
	201	rc = rtas_call(ibm_get_xive, 1, 3, status, vec);
	202	if (rc)
	203	return -1;
	204	return status[0];
	205	}
	206
5ca12376 ME	207	static int ics_rtas_host_match(struct ics ics, struct device_node node)
	208	{
	209	/* IBM machines have interrupt parents of various funky types for things
	210	* like vdevices, events, etc... The trick we use here is to match
	211	* everything here except the legacy 8259 which is compatible "chrp,iic"
	212	*/
	213	return !of_device_is_compatible(node, "chrp,iic");
	214	}
	215
174ea471	216	__init int ics_rtas_init(void)
0b05ac6e BH	217	{
	218	ibm_get_xive = rtas_token("ibm,get-xive");
	219	ibm_set_xive = rtas_token("ibm,set-xive");
	220	ibm_int_on = rtas_token("ibm,int-on");
	221	ibm_int_off = rtas_token("ibm,int-off");
	222
	223	/* We enable the RTAS "ICS" if RTAS is present with the
	224	* appropriate tokens
	225	*/
	226	if (ibm_get_xive == RTAS_UNKNOWN_SERVICE \|\|
	227	ibm_set_xive == RTAS_UNKNOWN_SERVICE)
	228	return -ENODEV;
	229
	230	/* We need to patch our irq chip's EOI to point to the
	231	* right ICP
	232	*/
	233	ics_rtas_irq_chip.irq_eoi = icp_ops->eoi;
	234
	235	/* Register ourselves */
	236	xics_register_ics(&ics_rtas);
	237
	238	return 0;
	239	}
	240