[PATCH] ia64: add Altix hotplug support

arch/ia64/sn/io/machvec/pci_bus_cvlink.c

@@ -384,6 +384,80 @@ sn_pci_fixup_slot(struct pci_dev *dev)
 	return 0;
 }
 
+#ifdef CONFIG_HOTPLUG_PCI_SGI
+
+void
+sn_dma_flush_clear(struct sn_flush_device_list *dma_flush_list,
+                   unsigned long start, unsigned long end)
+{
+
+        int i;
+
+        dma_flush_list->pin = -1;
+        dma_flush_list->bus = -1;
+        dma_flush_list->slot = -1;
+
+        for (i = 0; i < PCI_ROM_RESOURCE; i++)
+                if ((dma_flush_list->bar_list[i].start == start) &&
+                    (dma_flush_list->bar_list[i].end == end)) {
+                        dma_flush_list->bar_list[i].start = 0;
+                        dma_flush_list->bar_list[i].end = 0;
+                        break;
+                }           
+
+}
+
+/*
+ * sn_pci_unfixup_slot() - This routine frees a slot's resources
+ * consistent with the Linux PCI abstraction layer.  Resources released
+ * back to our PCI provider include PIO maps to BAR space and interrupt
+ * objects.
+ */
+void
+sn_pci_unfixup_slot(struct pci_dev *dev)
+{
+	struct sn_device_sysdata *device_sysdata;
+	vertex_hdl_t vhdl;
+	pciio_intr_t intr_handle;
+	unsigned int irq;
+	unsigned long size;
+	int idx;
+
+	device_sysdata = SN_DEVICE_SYSDATA(dev);
+
+	vhdl = device_sysdata->vhdl;
+
+	if (device_sysdata->dma_flush_list)
+		for (idx = 0; idx < PCI_ROM_RESOURCE; idx++) {
+			size = dev->resource[idx].end -
+				dev->resource[idx].start;
+			if (size == 0) continue;
+
+			sn_dma_flush_clear(device_sysdata->dma_flush_list,
+				   	   dev->resource[idx].start,
+				   	   dev->resource[idx].end);
+		}
+
+	intr_handle = device_sysdata->intr_handle;
+	if (intr_handle) {
+		extern void unregister_pcibr_intr(int, pcibr_intr_t);
+		irq = intr_handle->pi_irq;
+		irqpdaindr->device_dev[irq] = NULL;
+		unregister_pcibr_intr(irq, (pcibr_intr_t) intr_handle);
+		pciio_intr_disconnect(intr_handle);
+		pciio_intr_free(intr_handle);
+	}
+
+	for (idx = 0; idx < PCI_ROM_RESOURCE; idx++) {
+		if (device_sysdata->pio_map[idx]) {
+			pciio_piomap_done (device_sysdata->pio_map[idx]);
+			pciio_piomap_free (device_sysdata->pio_map[idx]);
+		}
+	}
+
+}
+#endif /* CONFIG_HOTPLUG_PCI_SGI */
+
 struct sn_flush_nasid_entry flush_nasid_list[MAX_NASIDS];
 
 /* Initialize the data structures for flushing write buffers after a PIO read.
@@ -534,6 +608,7 @@ sn_dma_flush_init(unsigned long start, unsigned long end, int idx, int pin, int
 	return p;
 }
 
+
 /*
  * linux_bus_cvlink() Creates a link between the Linux PCI Bus number
  *	to the actual hardware component that it represents:
@@ -774,7 +849,7 @@ sn_pci_init (void)
 			printk(KERN_WARNING
 				"sn_pci_fixup: sn_pci_fixup_bus fails : error %d\n",
 					ret);
-			return;
+			return 0;
 		}
 	}
 
@@ -805,7 +880,7 @@ sn_pci_init (void)
 			printk(KERN_WARNING
 				"sn_pci_fixup: sn_pci_fixup_slot fails : error %d\n",
 					ret);
-			return;
+			return 0;
 		}
 	}
 

arch/ia64/sn/io/sn2/pcibr/pcibr_dvr.c

@@ -629,6 +629,8 @@ pcibr_driver_reg_callback(vertex_hdl_t pconn_vhdl,
 
     pcibr_soft = pcibr_soft_get(pcibr_vhdl);
     pcibr_info->f_att_det_error = error;
+
+#ifdef CONFIG_HOTPLUG_PCI_SGI
     pcibr_soft->bs_slot[slot].slot_status &= ~SLOT_STATUS_MASK;
 
     if (error) {
@@ -636,6 +638,7 @@ pcibr_driver_reg_callback(vertex_hdl_t pconn_vhdl,
     } else {
         pcibr_soft->bs_slot[slot].slot_status |= SLOT_STARTUP_CMPLT;
     }
+#endif	/* CONFIG_HOTPLUG_PCI_SGI */
 }
 
 /*
@@ -668,6 +671,7 @@ pcibr_driver_unreg_callback(vertex_hdl_t pconn_vhdl,
 
     pcibr_soft = pcibr_soft_get(pcibr_vhdl);
     pcibr_info->f_att_det_error = error;
+#ifdef CONFIG_HOTPLUG_PCI_SGI
     pcibr_soft->bs_slot[slot].slot_status &= ~SLOT_STATUS_MASK;
 
     if (error) {
@@ -675,6 +679,7 @@ pcibr_driver_unreg_callback(vertex_hdl_t pconn_vhdl,
     } else {
         pcibr_soft->bs_slot[slot].slot_status |= SLOT_SHUTDOWN_CMPLT;
     }
+#endif	/* CONFIG_HOTPLUG_PCI_SGI */
 }
 
 /*

arch/ia64/sn/kernel/irq.c

@@ -211,6 +211,49 @@ register_pcibr_intr(int irq, pcibr_intr_t intr)
 	}
 }
 
+void
+unregister_pcibr_intr(int irq, pcibr_intr_t intr)
+{
+
+	struct sn_intr_list_t **prev, *curr;
+	int cpu = intr->bi_cpu;
+	int i;
+
+	if (sn_intr_list[irq] == NULL)
+		return;
+
+	prev = &sn_intr_list[irq];
+	curr = sn_intr_list[irq];
+	while (curr) {
+		if (curr->intr == intr)	 {
+			*prev = curr->next;
+			break;
+		}
+		prev = &curr->next;
+		curr = curr->next;
+	}
+
+	if (curr)
+		kfree(curr);
+
+	if (!sn_intr_list[irq]) {
+		if (pdacpu(cpu)->sn_last_irq == irq) {
+			for (i = pdacpu(cpu)->sn_last_irq - 1; i; i--)
+				if (sn_intr_list[i])
+					break;
+			pdacpu(cpu)->sn_last_irq = i;
+		}
+
+		if (pdacpu(cpu)->sn_first_irq == irq) {
+			pdacpu(cpu)->sn_first_irq = 0;
+			for (i = pdacpu(cpu)->sn_first_irq + 1; i < NR_IRQS; i++)
+				if (sn_intr_list[i])
+					pdacpu(cpu)->sn_first_irq = i;
+		}
+	}
+
+}
+
 void
 force_polled_int(void)
 {

drivers/pci/hotplug/Kconfig

@@ -122,5 +122,13 @@ config HOTPLUG_PCI_CPCI_GENERIC
 
 	  When in doubt, say N.
 
+config HOTPLUG_PCI_SGI
+	tristate "SGI PCI Hotplug Support"
+	depends on HOTPLUG_PCI && IA64_SGI_SN2
+	help
+	  Say Y here if you have an SGI IA64 Altix system.
+
+	  When in doubt, say N.
+
 endmenu
 

include/asm-ia64/sn/pci/pcibr.h

@@ -325,9 +325,27 @@ extern int		pcibr_asic_rev(vertex_hdl_t);
 #define PCIBR			'p'
 #define _PCIBR(x)		((PCIBR << 8) | (x))
 
-#define PCIBR_SLOT_STARTUP	_PCIBR(1)
-#define PCIBR_SLOT_SHUTDOWN     _PCIBR(2)
-#define PCIBR_SLOT_QUERY	_PCIBR(3)
+/*
+ * Bit defintions for variable slot_status in struct
+ * pcibr_soft_slot_s.  They are here so that the user
+ * hot-plug utility can interpret the slot's power
+ * status.
+ */
+#ifdef CONFIG_HOTPLUG_PCI_SGI
+#define PCI_SLOT_ENABLE_CMPLT       0x01    
+#define PCI_SLOT_ENABLE_INCMPLT     0x02    
+#define PCI_SLOT_DISABLE_CMPLT      0x04    
+#define PCI_SLOT_DISABLE_INCMPLT    0x08    
+#define PCI_SLOT_POWER_ON           0x10    
+#define PCI_SLOT_POWER_OFF          0x20    
+#define PCI_SLOT_IS_SYS_CRITICAL    0x40    
+#define PCI_SLOT_PCIBA_LOADED       0x80    
+
+#define PCI_SLOT_STATUS_MASK        (PCI_SLOT_ENABLE_CMPLT | \
+				     PCI_SLOT_ENABLE_INCMPLT | \
+                                     PCI_SLOT_DISABLE_CMPLT | \
+				     PCI_SLOT_DISABLE_INCMPLT)
+#define PCI_SLOT_POWER_MASK         (PCI_SLOT_POWER_ON | PCI_SLOT_POWER_OFF)
 
 /*
  * Bit defintions for variable slot_status in struct
@@ -356,26 +374,20 @@ extern int		pcibr_asic_rev(vertex_hdl_t);
 #define FUNC_IS_SYS_CRITICAL    0x02
 
 /*
- * Structures for requesting PCI bridge information and receiving a response
+ * L1 slot power operations for PCI hot-plug
  */
-typedef struct pcibr_slot_req_s *pcibr_slot_req_t;
-typedef struct pcibr_slot_up_resp_s *pcibr_slot_up_resp_t;
-typedef struct pcibr_slot_down_resp_s *pcibr_slot_down_resp_t;
-typedef struct pcibr_slot_info_resp_s *pcibr_slot_info_resp_t;
-typedef struct pcibr_slot_func_info_resp_s *pcibr_slot_func_info_resp_t;
+#define PCI_REQ_SLOT_POWER_ON       1
+#define PCI_L1_QSIZE                128      /* our L1 message buffer size */
+
 
 #define L1_QSIZE                128      /* our L1 message buffer size */
-struct pcibr_slot_req_s {
-    int                      req_slot;
-    union {
-        pcibr_slot_up_resp_t     up;
-        pcibr_slot_down_resp_t   down;
-        pcibr_slot_info_resp_t   query;
-        void                    *any;
-    }                       req_respp;
-    int                     req_size;
+
+enum pcibr_slot_disable_action_e {
+    PCI_REQ_SLOT_ELIGIBLE,
+    PCI_REQ_SLOT_DISABLE
 };
 
+
 struct pcibr_slot_up_resp_s {
     int                     resp_sub_errno;
     char                    resp_l1_msg[L1_QSIZE + 1];
@@ -444,6 +456,45 @@ struct pcibr_slot_info_resp_s {
     } resp_func[8];
 };
 
+struct pcibr_slot_req_s {
+    int                      req_slot;
+    union {
+        enum pcibr_slot_disable_action_e up;
+        struct pcibr_slot_down_resp_s *down;
+        struct pcibr_slot_info_resp_s *query;
+        void                    *any;
+    }                       req_respp;
+    int                     req_size;
+};
+
+struct pcibr_slot_enable_resp_s {
+    int                     resp_sub_errno;
+    char                    resp_l1_msg[PCI_L1_QSIZE + 1];
+};
+
+struct pcibr_slot_disable_resp_s {
+    int                     resp_sub_errno;
+    char                    resp_l1_msg[PCI_L1_QSIZE + 1];
+};
+
+struct pcibr_slot_enable_req_s {
+    pciio_slot_t              	     req_device;
+    struct pcibr_slot_enable_resp_s  req_resp;
+};
+
+struct pcibr_slot_disable_req_s {
+    pciio_slot_t                     req_device;
+    enum pcibr_slot_disable_action_e req_action;
+    struct pcibr_slot_disable_resp_s req_resp;
+};
+
+struct pcibr_slot_info_req_s {
+    pciio_slot_t              	     req_device;
+    struct pcibr_slot_info_resp_s    req_resp;
+};
+
+#endif	/* CONFIG_HOTPLUG_PCI_SGI */
+
 
 /*
  * PCI specific errors, interpreted by pciconfig command

include/asm-ia64/sn/pci/pcibr_private.h

@@ -475,6 +475,12 @@ struct pcibr_soft_s {
     
     vertex_hdl_t	    bs_noslot_conn;	/* NO-SLOT connection point */
     pcibr_info_t	    bs_noslot_info;
+
+#ifdef CONFIG_HOTPLUG_PCI_SGI
+    /* Linux PCI bus structure pointer */
+    struct pci_bus         *bs_pci_bus;
+#endif
+
     struct pcibr_soft_slot_s {
 	/* information we keep about each CFG slot */
 
@@ -492,9 +498,14 @@ struct pcibr_soft_s {
 	pciio_slot_t            host_slot;
 	vertex_hdl_t		slot_conn;
 
+#ifdef CONFIG_HOTPLUG_PCI_SGI
         /* PCI Hot-Plug status word */
         int 			slot_status;
 
+	/* PCI Hot-Plug core structure pointer */
+	struct hotplug_slot    *bss_hotplug_slot;
+#endif	/* CONFIG_HOTPLUG_PCI_SGI */
+
 	/* Potentially several connection points
 	 * for this slot. bss_ninfo is how many,
 	 * and bss_infos is a pointer to

include/asm-ia64/sn/sn_sal.h

@@ -58,6 +58,7 @@
 #define  SN_SAL_MEMPROTECT                         0x0200003e
 #define  SN_SAL_SYSCTL_FRU_CAPTURE		   0x0200003f
 
+#define  SN_SAL_SYSCTL_IOBRICK_PCI_OP		   0x02000042	// reentrant
 
 /*
  * Service-specific constants
@@ -72,6 +73,16 @@
 #define SAL_CONSOLE_INTR_XMIT	1	/* output interrupt */
 #define SAL_CONSOLE_INTR_RECV	2	/* input interrupt */
 
+#ifdef CONFIG_HOTPLUG_PCI_SGI
+/* power up / power down / reset a PCI slot or bus */
+#define SAL_SYSCTL_PCI_POWER_UP         0
+#define SAL_SYSCTL_PCI_POWER_DOWN       1
+#define SAL_SYSCTL_PCI_RESET            2
+
+/* what type of I/O brick? */
+#define SAL_SYSCTL_IO_XTALK	0       /* connected via a compute node */
+
+#endif	/* CONFIG_HOTPLUG_PCI_SGI */
 
 /*
  * SN_SAL_GET_PARTITION_ADDR return constants
@@ -641,4 +652,22 @@ ia64_sn_fru_capture(void)
         return isrv.v0;
 }
 
+/*
+ * Performs an operation on a PCI bus or slot -- power up, power down
+ * or reset.
+ */
+static inline u64
+ia64_sn_sysctl_iobrick_pci_op(nasid_t n, u64 connection_type, 
+			      u64 bus, slotid_t slot, 
+			      u64 action)
+{
+	struct ia64_sal_retval rv = {0, 0, 0, 0};
+
+	SAL_CALL_NOLOCK(rv, SN_SAL_SYSCTL_IOBRICK_PCI_OP, connection_type, n, action,
+		 bus, (u64) slot, 0, 0);
+	if (rv.status)
+	    	return rv.v0;
+	return 0;
+}
+
 #endif /* _ASM_IA64_SN_SN_SAL_H */