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hc
2023-12-08 01573e231f18eb2d99162747186f59511f56b64d 
 kernel/include/linux/msi.h
....@@ -48,6 +48,14 @@
4848 };
4949 
5050 /**
51
+ * ti_sci_inta_msi_desc - TISCI based INTA specific msi descriptor data
52
+ * @dev_index: TISCI device index
53
+ */
54
+struct ti_sci_inta_msi_desc {
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+	u16	dev_index;
56
+};
57
+
58
+/**
5159  * struct msi_desc - Descriptor structure for MSI based interrupts
5260  * @list:	List head for management
5361  * @irq:	The base interrupt number
....@@ -55,6 +63,10 @@
5563  * @dev:	Pointer to the device which uses this descriptor
5664  * @msg:	The last set MSI message cached for reuse
5765  * @affinity:	Optional pointer to a cpu affinity mask for this descriptor
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+ *
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+ * @write_msi_msg:	Callback that may be called when the MSI message
68
+ *			address or data changes
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+ * @write_msi_msg_data:	Data parameter for the callback.
5870  *
5971  * @masked:	[PCI MSI/X] Mask bits
6072  * @is_msix:	[PCI MSI/X] True if MSI-X
....@@ -68,6 +80,7 @@
6880  * @mask_base:	[PCI MSI-X] Mask register base address
6981  * @platform:	[platform]  Platform device specific msi descriptor data
7082  * @fsl_mc:	[fsl-mc]    FSL MC device specific msi descriptor data
83
+ * @inta:	[INTA]	    TISCI based INTA specific msi descriptor data
7184  */
7285 struct msi_desc {
7386 	/* Shared device/bus type independent data */
....@@ -76,19 +89,26 @@
7689 	unsigned int			nvec_used;
7790 	struct device			*dev;
7891 	struct msi_msg			msg;
79
-	struct cpumask			*affinity;
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+	struct irq_affinity_desc	*affinity;
93
+#ifdef CONFIG_IRQ_MSI_IOMMU
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+	const void			*iommu_cookie;
95
+#endif
96
+
97
+	void (*write_msi_msg)(struct msi_desc *entry, void *data);
98
+	void *write_msi_msg_data;
8099 
81100 	union {
82101 		/* PCI MSI/X specific data */
83102 		struct {
84103 			u32 masked;
85104 			struct {
86
-				__u8	is_msix		: 1;
87
-				__u8	multiple	: 3;
88
-				__u8	multi_cap	: 3;
89
-				__u8	maskbit		: 1;
90
-				__u8	is_64		: 1;
91
-				__u16	entry_nr;
105
+				u8	is_msix		: 1;
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+				u8	multiple	: 3;
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+				u8	multi_cap	: 3;
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+				u8	maskbit		: 1;
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+				u8	is_64		: 1;
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+				u8	is_virtual	: 1;
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+				u16	entry_nr;
92112 				unsigned default_irq;
93113 			} msi_attrib;
94114 			union {
....@@ -106,6 +126,7 @@
106126 		 */
107127 		struct platform_msi_desc platform;
108128 		struct fsl_mc_msi_desc fsl_mc;
129
+		struct ti_sci_inta_msi_desc inta;
109130 	};
110131 };
111132 
....@@ -124,6 +145,29 @@
124145 			for (__irq = (desc)->irq;			\
125146 			     __irq < ((desc)->irq + (desc)->nvec_used);	\
126147 			     __irq++)
148
+
149
+#ifdef CONFIG_IRQ_MSI_IOMMU
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+static inline const void *msi_desc_get_iommu_cookie(struct msi_desc *desc)
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+{
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+	return desc->iommu_cookie;
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+}
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+
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+static inline void msi_desc_set_iommu_cookie(struct msi_desc *desc,
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+					     const void *iommu_cookie)
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+{
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+	desc->iommu_cookie = iommu_cookie;
159
+}
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+#else
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+static inline const void *msi_desc_get_iommu_cookie(struct msi_desc *desc)
162
+{
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+	return NULL;
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+}
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+
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+static inline void msi_desc_set_iommu_cookie(struct msi_desc *desc,
167
+					     const void *iommu_cookie)
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+{
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+}
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+#endif
127171 
128172 #ifdef CONFIG_PCI_MSI
129173 #define first_pci_msi_entry(pdev)	first_msi_entry(&(pdev)->dev)
....@@ -144,7 +188,7 @@
144188 #endif /* CONFIG_PCI_MSI */
145189 
146190 struct msi_desc *alloc_msi_entry(struct device *dev, int nvec,
147
-				 const struct cpumask *affinity);
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+				 const struct irq_affinity_desc *affinity);
148192 void free_msi_entry(struct msi_desc *entry);
149193 void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
150194 void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
....@@ -154,36 +198,39 @@
154198 void pci_msi_mask_irq(struct irq_data *data);
155199 void pci_msi_unmask_irq(struct irq_data *data);
156200 
157
-/* Conversion helpers. Should be removed after merging */
158
-static inline void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
159
-{
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-	__pci_write_msi_msg(entry, msg);
161
-}
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-static inline void write_msi_msg(int irq, struct msi_msg *msg)
163
-{
164
-	pci_write_msi_msg(irq, msg);
165
-}
166
-static inline void mask_msi_irq(struct irq_data *data)
167
-{
168
-	pci_msi_mask_irq(data);
169
-}
170
-static inline void unmask_msi_irq(struct irq_data *data)
171
-{
172
-	pci_msi_unmask_irq(data);
173
-}
174
-
175201 /*
176
- * The arch hooks to setup up msi irqs. Those functions are
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- * implemented as weak symbols so that they /can/ be overriden by
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- * architecture specific code if needed.
202
+ * The arch hooks to setup up msi irqs. Default functions are implemented
203
+ * as weak symbols so that they /can/ be overriden by architecture specific
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+ * code if needed. These hooks must be enabled by the architecture or by
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+ * drivers which depend on them via msi_controller based MSI handling.
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+ *
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+ * If CONFIG_PCI_MSI_ARCH_FALLBACKS is not selected they are replaced by
208
+ * stubs with warnings.
179209  */
210
+#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
180211 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
181212 void arch_teardown_msi_irq(unsigned int irq);
182213 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
183214 void arch_teardown_msi_irqs(struct pci_dev *dev);
184
-void arch_restore_msi_irqs(struct pci_dev *dev);
185
-
186215 void default_teardown_msi_irqs(struct pci_dev *dev);
216
+#else
217
+static inline int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
218
+{
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+	WARN_ON_ONCE(1);
220
+	return -ENODEV;
221
+}
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+
223
+static inline void arch_teardown_msi_irqs(struct pci_dev *dev)
224
+{
225
+	WARN_ON_ONCE(1);
226
+}
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+#endif
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+
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+/*
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+ * The restore hooks are still available as they are useful even
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+ * for fully irq domain based setups. Courtesy to XEN/X86.
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+ */
233
+void arch_restore_msi_irqs(struct pci_dev *dev);
187234 void default_restore_msi_irqs(struct pci_dev *dev);
188235 
189236 struct msi_controller {
....@@ -221,6 +268,10 @@
221268  * @msi_finish:		Optional callback to finalize the allocation
222269  * @set_desc:		Set the msi descriptor for an interrupt
223270  * @handle_error:	Optional error handler if the allocation fails
271
+ * @domain_alloc_irqs:	Optional function to override the default allocation
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+ *			function.
273
+ * @domain_free_irqs:	Optional function to override the default free
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+ *			function.
224275  *
225276  * @get_hwirq, @msi_init and @msi_free are callbacks used by
226277  * msi_create_irq_domain() and related interfaces
....@@ -228,6 +279,22 @@
228279  * @msi_check, @msi_prepare, @msi_finish, @set_desc and @handle_error
229280  * are callbacks used by msi_domain_alloc_irqs() and related
230281  * interfaces which are based on msi_desc.
282
+ *
283
+ * @domain_alloc_irqs, @domain_free_irqs can be used to override the
284
+ * default allocation/free functions (__msi_domain_alloc/free_irqs). This
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+ * is initially for a wrapper around XENs seperate MSI universe which can't
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+ * be wrapped into the regular irq domains concepts by mere mortals.  This
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+ * allows to universally use msi_domain_alloc/free_irqs without having to
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+ * special case XEN all over the place.
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+ *
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+ * Contrary to other operations @domain_alloc_irqs and @domain_free_irqs
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+ * are set to the default implementation if NULL and even when
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+ * MSI_FLAG_USE_DEF_DOM_OPS is not set to avoid breaking existing users and
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+ * because these callbacks are obviously mandatory.
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+ *
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+ * This is NOT meant to be abused, but it can be useful to build wrappers
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+ * for specialized MSI irq domains which need extra work before and after
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+ * calling __msi_domain_alloc_irqs()/__msi_domain_free_irqs().
231298  */
232299 struct msi_domain_ops {
233300 	irq_hw_number_t	(*get_hwirq)(struct msi_domain_info *info,
....@@ -250,6 +317,10 @@
250317 				    struct msi_desc *desc);
251318 	int		(*handle_error)(struct irq_domain *domain,
252319 					struct msi_desc *desc, int error);
320
+	int		(*domain_alloc_irqs)(struct irq_domain *domain,
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+					     struct device *dev, int nvec);
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+	void		(*domain_free_irqs)(struct irq_domain *domain,
323
+					    struct device *dev);
253324 };
254325 
255326 /**
....@@ -307,8 +378,11 @@
307378 struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
308379 					 struct msi_domain_info *info,
309380 					 struct irq_domain *parent);
381
+int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
382
+			    int nvec);
310383 int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
311384 			  int nvec);
385
+void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
312386 void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
313387 struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
314388 
....@@ -325,11 +399,18 @@
325399 int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
326400 			     int virq, int nvec, msi_alloc_info_t *args);
327401 struct irq_domain *
328
-platform_msi_create_device_domain(struct device *dev,
329
-				  unsigned int nvec,
330
-				  irq_write_msi_msg_t write_msi_msg,
331
-				  const struct irq_domain_ops *ops,
332
-				  void *host_data);
402
+__platform_msi_create_device_domain(struct device *dev,
403
+				    unsigned int nvec,
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+				    bool is_tree,
405
+				    irq_write_msi_msg_t write_msi_msg,
406
+				    const struct irq_domain_ops *ops,
407
+				    void *host_data);
408
+
409
+#define platform_msi_create_device_domain(dev, nvec, write, ops, data)	\
410
+	__platform_msi_create_device_domain(dev, nvec, false, write, ops, data)
411
+#define platform_msi_create_device_tree_domain(dev, nvec, write, ops, data) \
412
+	__platform_msi_create_device_domain(dev, nvec, true, write, ops, data)
413
+
333414 int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
334415 			      unsigned int nr_irqs);
335416 void platform_msi_domain_free(struct irq_domain *domain, unsigned int virq,
....@@ -342,12 +423,11 @@
342423 struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
343424 					     struct msi_domain_info *info,
344425 					     struct irq_domain *parent);
345
-irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
346
-					  struct msi_desc *desc);
347426 int pci_msi_domain_check_cap(struct irq_domain *domain,
348427 			     struct msi_domain_info *info, struct device *dev);
349428 u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);
350429 struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev);
430
+bool pci_dev_has_special_msi_domain(struct pci_dev *pdev);
351431 #else
352432 static inline struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
353433 {