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-rw-r--r--include/linux/device.h31
-rw-r--r--include/linux/fsl/mc.h4
-rw-r--r--include/linux/msi.h289
-rw-r--r--include/linux/pci.h6
-rw-r--r--include/linux/soc/ti/ti_sci_inta_msi.h2
5 files changed, 179 insertions, 153 deletions
diff --git a/include/linux/device.h b/include/linux/device.h
index e270cb740b9e..93459724dcde 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -45,6 +45,7 @@ struct iommu_ops;
struct iommu_group;
struct dev_pin_info;
struct dev_iommu;
+struct msi_device_data;
/**
* struct subsys_interface - interfaces to device functions
@@ -372,6 +373,20 @@ struct dev_links_info {
};
/**
+ * struct dev_msi_info - Device data related to MSI
+ * @domain: The MSI interrupt domain associated to the device
+ * @data: Pointer to MSI device data
+ */
+struct dev_msi_info {
+#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
+ struct irq_domain *domain;
+#endif
+#ifdef CONFIG_GENERIC_MSI_IRQ
+ struct msi_device_data *data;
+#endif
+};
+
+/**
* struct device - The basic device structure
* @parent: The device's "parent" device, the device to which it is attached.
* In most cases, a parent device is some sort of bus or host
@@ -407,9 +422,7 @@ struct dev_links_info {
* @em_pd: device's energy model performance domain
* @pins: For device pin management.
* See Documentation/driver-api/pin-control.rst for details.
- * @msi_lock: Lock to protect MSI mask cache and mask register
- * @msi_list: Hosts MSI descriptors
- * @msi_domain: The generic MSI domain this device is using.
+ * @msi: MSI related data
* @numa_node: NUMA node this device is close to.
* @dma_ops: DMA mapping operations for this device.
* @dma_mask: Dma mask (if dma'ble device).
@@ -501,16 +514,10 @@ struct device {
struct em_perf_domain *em_pd;
#endif
-#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
- struct irq_domain *msi_domain;
-#endif
#ifdef CONFIG_PINCTRL
struct dev_pin_info *pins;
#endif
-#ifdef CONFIG_GENERIC_MSI_IRQ
- raw_spinlock_t msi_lock;
- struct list_head msi_list;
-#endif
+ struct dev_msi_info msi;
#ifdef CONFIG_DMA_OPS
const struct dma_map_ops *dma_ops;
#endif
@@ -668,7 +675,7 @@ static inline void set_dev_node(struct device *dev, int node)
static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
{
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
- return dev->msi_domain;
+ return dev->msi.domain;
#else
return NULL;
#endif
@@ -677,7 +684,7 @@ static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
{
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
- dev->msi_domain = d;
+ dev->msi.domain = d;
#endif
}
diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h
index e026f6c48b49..7b6c42bfb660 100644
--- a/include/linux/fsl/mc.h
+++ b/include/linux/fsl/mc.h
@@ -91,13 +91,13 @@ struct fsl_mc_resource {
/**
* struct fsl_mc_device_irq - MC object device message-based interrupt
- * @msi_desc: pointer to MSI descriptor allocated by fsl_mc_msi_alloc_descs()
+ * @virq: Linux virtual interrupt number
* @mc_dev: MC object device that owns this interrupt
* @dev_irq_index: device-relative IRQ index
* @resource: MC generic resource associated with the interrupt
*/
struct fsl_mc_device_irq {
- struct msi_desc *msi_desc;
+ unsigned int virq;
struct fsl_mc_device *mc_dev;
u8 dev_irq_index;
struct fsl_mc_resource resource;
diff --git a/include/linux/msi.h b/include/linux/msi.h
index e616f94c7c58..fc918a658d48 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -2,7 +2,23 @@
#ifndef LINUX_MSI_H
#define LINUX_MSI_H
-#include <linux/kobject.h>
+/*
+ * This header file contains MSI data structures and functions which are
+ * only relevant for:
+ * - Interrupt core code
+ * - PCI/MSI core code
+ * - MSI interrupt domain implementations
+ * - IOMMU, low level VFIO, NTB and other justified exceptions
+ * dealing with low level MSI details.
+ *
+ * Regular device drivers have no business with any of these functions and
+ * especially storing MSI descriptor pointers in random code is considered
+ * abuse. The only function which is relevant for drivers is msi_get_virq().
+ */
+
+#include <linux/cpumask.h>
+#include <linux/xarray.h>
+#include <linux/mutex.h>
#include <linux/list.h>
#include <asm/msi.h>
@@ -56,6 +72,8 @@ struct irq_data;
struct msi_desc;
struct pci_dev;
struct platform_msi_priv_data;
+struct device_attribute;
+
void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
#ifdef CONFIG_GENERIC_MSI_IRQ
void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
@@ -69,62 +87,59 @@ typedef void (*irq_write_msi_msg_t)(struct msi_desc *desc,
struct msi_msg *msg);
/**
- * platform_msi_desc - Platform device specific msi descriptor data
- * @msi_priv_data: Pointer to platform private data
- * @msi_index: The index of the MSI descriptor for multi MSI
- */
-struct platform_msi_desc {
- struct platform_msi_priv_data *msi_priv_data;
- u16 msi_index;
-};
-
-/**
- * fsl_mc_msi_desc - FSL-MC device specific msi descriptor data
- * @msi_index: The index of the MSI descriptor
+ * pci_msi_desc - PCI/MSI specific MSI descriptor data
+ *
+ * @msi_mask: [PCI MSI] MSI cached mask bits
+ * @msix_ctrl: [PCI MSI-X] MSI-X cached per vector control bits
+ * @is_msix: [PCI MSI/X] True if MSI-X
+ * @multiple: [PCI MSI/X] log2 num of messages allocated
+ * @multi_cap: [PCI MSI/X] log2 num of messages supported
+ * @can_mask: [PCI MSI/X] Masking supported?
+ * @is_64: [PCI MSI/X] Address size: 0=32bit 1=64bit
+ * @default_irq:[PCI MSI/X] The default pre-assigned non-MSI irq
+ * @mask_pos: [PCI MSI] Mask register position
+ * @mask_base: [PCI MSI-X] Mask register base address
*/
-struct fsl_mc_msi_desc {
- u16 msi_index;
+struct pci_msi_desc {
+ union {
+ u32 msi_mask;
+ u32 msix_ctrl;
+ };
+ struct {
+ u8 is_msix : 1;
+ u8 multiple : 3;
+ u8 multi_cap : 3;
+ u8 can_mask : 1;
+ u8 is_64 : 1;
+ u8 is_virtual : 1;
+ unsigned default_irq;
+ } msi_attrib;
+ union {
+ u8 mask_pos;
+ void __iomem *mask_base;
+ };
};
-/**
- * ti_sci_inta_msi_desc - TISCI based INTA specific msi descriptor data
- * @dev_index: TISCI device index
- */
-struct ti_sci_inta_msi_desc {
- u16 dev_index;
-};
+#define MSI_MAX_INDEX ((unsigned int)USHRT_MAX)
/**
* struct msi_desc - Descriptor structure for MSI based interrupts
- * @list: List head for management
* @irq: The base interrupt number
* @nvec_used: The number of vectors used
* @dev: Pointer to the device which uses this descriptor
* @msg: The last set MSI message cached for reuse
* @affinity: Optional pointer to a cpu affinity mask for this descriptor
+ * @sysfs_attr: Pointer to sysfs device attribute
*
* @write_msi_msg: Callback that may be called when the MSI message
* address or data changes
* @write_msi_msg_data: Data parameter for the callback.
*
- * @msi_mask: [PCI MSI] MSI cached mask bits
- * @msix_ctrl: [PCI MSI-X] MSI-X cached per vector control bits
- * @is_msix: [PCI MSI/X] True if MSI-X
- * @multiple: [PCI MSI/X] log2 num of messages allocated
- * @multi_cap: [PCI MSI/X] log2 num of messages supported
- * @maskbit: [PCI MSI/X] Mask-Pending bit supported?
- * @is_64: [PCI MSI/X] Address size: 0=32bit 1=64bit
- * @entry_nr: [PCI MSI/X] Entry which is described by this descriptor
- * @default_irq:[PCI MSI/X] The default pre-assigned non-MSI irq
- * @mask_pos: [PCI MSI] Mask register position
- * @mask_base: [PCI MSI-X] Mask register base address
- * @platform: [platform] Platform device specific msi descriptor data
- * @fsl_mc: [fsl-mc] FSL MC device specific msi descriptor data
- * @inta: [INTA] TISCI based INTA specific msi descriptor data
+ * @msi_index: Index of the msi descriptor
+ * @pci: PCI specific msi descriptor data
*/
struct msi_desc {
/* Shared device/bus type independent data */
- struct list_head list;
unsigned int irq;
unsigned int nvec_used;
struct device *dev;
@@ -133,61 +148,71 @@ struct msi_desc {
#ifdef CONFIG_IRQ_MSI_IOMMU
const void *iommu_cookie;
#endif
+#ifdef CONFIG_SYSFS
+ struct device_attribute *sysfs_attrs;
+#endif
void (*write_msi_msg)(struct msi_desc *entry, void *data);
void *write_msi_msg_data;
- union {
- /* PCI MSI/X specific data */
- struct {
- union {
- u32 msi_mask;
- u32 msix_ctrl;
- };
- struct {
- u8 is_msix : 1;
- u8 multiple : 3;
- u8 multi_cap : 3;
- u8 can_mask : 1;
- u8 is_64 : 1;
- u8 is_virtual : 1;
- u16 entry_nr;
- unsigned default_irq;
- } msi_attrib;
- union {
- u8 mask_pos;
- void __iomem *mask_base;
- };
- };
-
- /*
- * Non PCI variants add their data structure here. New
- * entries need to use a named structure. We want
- * proper name spaces for this. The PCI part is
- * anonymous for now as it would require an immediate
- * tree wide cleanup.
- */
- struct platform_msi_desc platform;
- struct fsl_mc_msi_desc fsl_mc;
- struct ti_sci_inta_msi_desc inta;
- };
+ u16 msi_index;
+ struct pci_msi_desc pci;
+};
+
+/*
+ * Filter values for the MSI descriptor iterators and accessor functions.
+ */
+enum msi_desc_filter {
+ /* All descriptors */
+ MSI_DESC_ALL,
+ /* Descriptors which have no interrupt associated */
+ MSI_DESC_NOTASSOCIATED,
+ /* Descriptors which have an interrupt associated */
+ MSI_DESC_ASSOCIATED,
};
-/* Helpers to hide struct msi_desc implementation details */
+/**
+ * msi_device_data - MSI per device data
+ * @properties: MSI properties which are interesting to drivers
+ * @platform_data: Platform-MSI specific data
+ * @mutex: Mutex protecting the MSI descriptor store
+ * @__store: Xarray for storing MSI descriptor pointers
+ * @__iter_idx: Index to search the next entry for iterators
+ */
+struct msi_device_data {
+ unsigned long properties;
+ struct platform_msi_priv_data *platform_data;
+ struct mutex mutex;
+ struct xarray __store;
+ unsigned long __iter_idx;
+};
+
+int msi_setup_device_data(struct device *dev);
+
+unsigned int msi_get_virq(struct device *dev, unsigned int index);
+void msi_lock_descs(struct device *dev);
+void msi_unlock_descs(struct device *dev);
+
+struct msi_desc *msi_first_desc(struct device *dev, enum msi_desc_filter filter);
+struct msi_desc *msi_next_desc(struct device *dev, enum msi_desc_filter filter);
+
+/**
+ * msi_for_each_desc - Iterate the MSI descriptors
+ *
+ * @desc: struct msi_desc pointer used as iterator
+ * @dev: struct device pointer - device to iterate
+ * @filter: Filter for descriptor selection
+ *
+ * Notes:
+ * - The loop must be protected with a msi_lock_descs()/msi_unlock_descs()
+ * pair.
+ * - It is safe to remove a retrieved MSI descriptor in the loop.
+ */
+#define msi_for_each_desc(desc, dev, filter) \
+ for ((desc) = msi_first_desc((dev), (filter)); (desc); \
+ (desc) = msi_next_desc((dev), (filter)))
+
#define msi_desc_to_dev(desc) ((desc)->dev)
-#define dev_to_msi_list(dev) (&(dev)->msi_list)
-#define first_msi_entry(dev) \
- list_first_entry(dev_to_msi_list((dev)), struct msi_desc, list)
-#define for_each_msi_entry(desc, dev) \
- list_for_each_entry((desc), dev_to_msi_list((dev)), list)
-#define for_each_msi_entry_safe(desc, tmp, dev) \
- list_for_each_entry_safe((desc), (tmp), dev_to_msi_list((dev)), list)
-#define for_each_msi_vector(desc, __irq, dev) \
- for_each_msi_entry((desc), (dev)) \
- if ((desc)->irq) \
- for (__irq = (desc)->irq; \
- __irq < ((desc)->irq + (desc)->nvec_used); \
- __irq++)
#ifdef CONFIG_IRQ_MSI_IOMMU
static inline const void *msi_desc_get_iommu_cookie(struct msi_desc *desc)
@@ -213,36 +238,33 @@ static inline void msi_desc_set_iommu_cookie(struct msi_desc *desc,
#endif
#ifdef CONFIG_PCI_MSI
-#define first_pci_msi_entry(pdev) first_msi_entry(&(pdev)->dev)
-#define for_each_pci_msi_entry(desc, pdev) \
- for_each_msi_entry((desc), &(pdev)->dev)
-
struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc);
-void *msi_desc_to_pci_sysdata(struct msi_desc *desc);
void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
#else /* CONFIG_PCI_MSI */
-static inline void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
-{
- return NULL;
-}
static inline void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)
{
}
#endif /* CONFIG_PCI_MSI */
-struct msi_desc *alloc_msi_entry(struct device *dev, int nvec,
- const struct irq_affinity_desc *affinity);
-void free_msi_entry(struct msi_desc *entry);
+int msi_add_msi_desc(struct device *dev, struct msi_desc *init_desc);
+void msi_free_msi_descs_range(struct device *dev, enum msi_desc_filter filter,
+ unsigned int first_index, unsigned int last_index);
+
+/**
+ * msi_free_msi_descs - Free MSI descriptors of a device
+ * @dev: Device to free the descriptors
+ */
+static inline void msi_free_msi_descs(struct device *dev)
+{
+ msi_free_msi_descs_range(dev, MSI_DESC_ALL, 0, MSI_MAX_INDEX);
+}
+
void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
void pci_msi_mask_irq(struct irq_data *data);
void pci_msi_unmask_irq(struct irq_data *data);
-const struct attribute_group **msi_populate_sysfs(struct device *dev);
-void msi_destroy_sysfs(struct device *dev,
- const struct attribute_group **msi_irq_groups);
-
/*
* The arch hooks to setup up msi irqs. Default functions are implemented
* as weak symbols so that they /can/ be overriden by architecture specific
@@ -256,25 +278,20 @@ int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
void arch_teardown_msi_irq(unsigned int irq);
int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
void arch_teardown_msi_irqs(struct pci_dev *dev);
-#else
-static inline int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
-{
- WARN_ON_ONCE(1);
- return -ENODEV;
-}
-
-static inline void arch_teardown_msi_irqs(struct pci_dev *dev)
-{
- WARN_ON_ONCE(1);
-}
-#endif
+#ifdef CONFIG_SYSFS
+int msi_device_populate_sysfs(struct device *dev);
+void msi_device_destroy_sysfs(struct device *dev);
+#else /* CONFIG_SYSFS */
+static inline int msi_device_populate_sysfs(struct device *dev) { return 0; }
+static inline void msi_device_destroy_sysfs(struct device *dev) { }
+#endif /* !CONFIG_SYSFS */
+#endif /* CONFIG_PCI_MSI_ARCH_FALLBACKS */
/*
- * The restore hooks are still available as they are useful even
- * for fully irq domain based setups. Courtesy to XEN/X86.
+ * The restore hook is still available even for fully irq domain based
+ * setups. Courtesy to XEN/X86.
*/
-void arch_restore_msi_irqs(struct pci_dev *dev);
-void default_restore_msi_irqs(struct pci_dev *dev);
+bool arch_restore_msi_irqs(struct pci_dev *dev);
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
@@ -294,20 +311,17 @@ struct msi_domain_info;
* @msi_free: Domain specific function to free a MSI interrupts
* @msi_check: Callback for verification of the domain/info/dev data
* @msi_prepare: Prepare the allocation of the interrupts in the domain
- * @msi_finish: Optional callback to finalize the allocation
* @set_desc: Set the msi descriptor for an interrupt
- * @handle_error: Optional error handler if the allocation fails
* @domain_alloc_irqs: Optional function to override the default allocation
* function.
* @domain_free_irqs: Optional function to override the default free
* function.
*
- * @get_hwirq, @msi_init and @msi_free are callbacks used by
- * msi_create_irq_domain() and related interfaces
+ * @get_hwirq, @msi_init and @msi_free are callbacks used by the underlying
+ * irqdomain.
*
- * @msi_check, @msi_prepare, @msi_finish, @set_desc and @handle_error
- * are callbacks used by msi_domain_alloc_irqs() and related
- * interfaces which are based on msi_desc.
+ * @msi_check, @msi_prepare and @set_desc are callbacks used by
+ * msi_domain_alloc/free_irqs().
*
* @domain_alloc_irqs, @domain_free_irqs can be used to override the
* default allocation/free functions (__msi_domain_alloc/free_irqs). This
@@ -341,11 +355,8 @@ struct msi_domain_ops {
int (*msi_prepare)(struct irq_domain *domain,
struct device *dev, int nvec,
msi_alloc_info_t *arg);
- void (*msi_finish)(msi_alloc_info_t *arg, int retval);
void (*set_desc)(msi_alloc_info_t *arg,
struct msi_desc *desc);
- int (*handle_error)(struct irq_domain *domain,
- struct msi_desc *desc, int error);
int (*domain_alloc_irqs)(struct irq_domain *domain,
struct device *dev, int nvec);
void (*domain_free_irqs)(struct irq_domain *domain,
@@ -399,6 +410,14 @@ enum {
MSI_FLAG_MUST_REACTIVATE = (1 << 5),
/* Is level-triggered capable, using two messages */
MSI_FLAG_LEVEL_CAPABLE = (1 << 6),
+ /* Populate sysfs on alloc() and destroy it on free() */
+ MSI_FLAG_DEV_SYSFS = (1 << 7),
+ /* MSI-X entries must be contiguous */
+ MSI_FLAG_MSIX_CONTIGUOUS = (1 << 8),
+ /* Allocate simple MSI descriptors */
+ MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS = (1 << 9),
+ /* Free MSI descriptors */
+ MSI_FLAG_FREE_MSI_DESCS = (1 << 10),
};
int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
@@ -409,9 +428,12 @@ struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
struct irq_domain *parent);
int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
int nvec);
+int msi_domain_alloc_irqs_descs_locked(struct irq_domain *domain, struct device *dev,
+ int nvec);
int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
int nvec);
void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
+void msi_domain_free_irqs_descs_locked(struct irq_domain *domain, struct device *dev);
void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
@@ -440,20 +462,17 @@ __platform_msi_create_device_domain(struct device *dev,
#define platform_msi_create_device_tree_domain(dev, nvec, write, ops, data) \
__platform_msi_create_device_domain(dev, nvec, true, write, ops, data)
-int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
- unsigned int nr_irqs);
-void platform_msi_domain_free(struct irq_domain *domain, unsigned int virq,
- unsigned int nvec);
+int platform_msi_device_domain_alloc(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs);
+void platform_msi_device_domain_free(struct irq_domain *domain, unsigned int virq,
+ unsigned int nvec);
void *platform_msi_get_host_data(struct irq_domain *domain);
#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
-void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg);
struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
struct msi_domain_info *info,
struct irq_domain *parent);
-int pci_msi_domain_check_cap(struct irq_domain *domain,
- struct msi_domain_info *info, struct device *dev);
u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);
struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev);
bool pci_dev_has_special_msi_domain(struct pci_dev *pdev);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 18a75c8e615c..0a7b6b2f163b 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -425,7 +425,8 @@ struct pci_dev {
unsigned int ats_enabled:1; /* Address Translation Svc */
unsigned int pasid_enabled:1; /* Process Address Space ID */
unsigned int pri_enabled:1; /* Page Request Interface */
- unsigned int is_managed:1;
+ unsigned int is_managed:1; /* Managed via devres */
+ unsigned int is_msi_managed:1; /* MSI release via devres installed */
unsigned int needs_freset:1; /* Requires fundamental reset */
unsigned int state_saved:1;
unsigned int is_physfn:1;
@@ -473,7 +474,8 @@ struct pci_dev {
u8 ptm_granularity;
#endif
#ifdef CONFIG_PCI_MSI
- const struct attribute_group **msi_irq_groups;
+ void __iomem *msix_base;
+ raw_spinlock_t msi_lock;
#endif
struct pci_vpd vpd;
#ifdef CONFIG_PCIE_DPC
diff --git a/include/linux/soc/ti/ti_sci_inta_msi.h b/include/linux/soc/ti/ti_sci_inta_msi.h
index e3aa8b14612e..4dba2f2aff6f 100644
--- a/include/linux/soc/ti/ti_sci_inta_msi.h
+++ b/include/linux/soc/ti/ti_sci_inta_msi.h
@@ -18,6 +18,4 @@ struct irq_domain
struct irq_domain *parent);
int ti_sci_inta_msi_domain_alloc_irqs(struct device *dev,
struct ti_sci_resource *res);
-unsigned int ti_sci_inta_msi_get_virq(struct device *dev, u32 index);
-void ti_sci_inta_msi_domain_free_irqs(struct device *dev);
#endif /* __INCLUDE_LINUX_IRQCHIP_TI_SCI_INTA_H */
generated by cgit (git 2.34.1) at 2024-07-02 17:28:46 +0000