pci.h (10444B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __POWERNV_PCI_H 3#define __POWERNV_PCI_H 4 5#include <linux/compiler.h> /* for __printf */ 6#include <linux/iommu.h> 7#include <asm/iommu.h> 8#include <asm/msi_bitmap.h> 9 10struct pci_dn; 11 12enum pnv_phb_type { 13 PNV_PHB_IODA1, 14 PNV_PHB_IODA2, 15 PNV_PHB_NPU_OCAPI, 16}; 17 18/* Precise PHB model for error management */ 19enum pnv_phb_model { 20 PNV_PHB_MODEL_UNKNOWN, 21 PNV_PHB_MODEL_P7IOC, 22 PNV_PHB_MODEL_PHB3, 23}; 24 25#define PNV_PCI_DIAG_BUF_SIZE 8192 26#define PNV_IODA_PE_DEV (1 << 0) /* PE has single PCI device */ 27#define PNV_IODA_PE_BUS (1 << 1) /* PE has primary PCI bus */ 28#define PNV_IODA_PE_BUS_ALL (1 << 2) /* PE has subordinate buses */ 29#define PNV_IODA_PE_MASTER (1 << 3) /* Master PE in compound case */ 30#define PNV_IODA_PE_SLAVE (1 << 4) /* Slave PE in compound case */ 31#define PNV_IODA_PE_VF (1 << 5) /* PE for one VF */ 32 33/* 34 * A brief note on PNV_IODA_PE_BUS_ALL 35 * 36 * This is needed because of the behaviour of PCIe-to-PCI bridges. The PHB uses 37 * the Requester ID field of the PCIe request header to determine the device 38 * (and PE) that initiated a DMA. In legacy PCI individual memory read/write 39 * requests aren't tagged with the RID. To work around this the PCIe-to-PCI 40 * bridge will use (secondary_bus_no << 8) | 0x00 as the RID on the PCIe side. 41 * 42 * PCIe-to-X bridges have a similar issue even though PCI-X requests also have 43 * a RID in the transaction header. The PCIe-to-X bridge is permitted to "take 44 * ownership" of a transaction by a PCI-X device when forwarding it to the PCIe 45 * side of the bridge. 46 * 47 * To work around these problems we use the BUS_ALL flag since every subordinate 48 * bus of the bridge should go into the same PE. 49 */ 50 51/* Indicates operations are frozen for a PE: MMIO in PESTA & DMA in PESTB. */ 52#define PNV_IODA_STOPPED_STATE 0x8000000000000000 53 54/* Data associated with a PE, including IOMMU tracking etc.. */ 55struct pnv_phb; 56struct pnv_ioda_pe { 57 unsigned long flags; 58 struct pnv_phb *phb; 59 int device_count; 60 61 /* A PE can be associated with a single device or an 62 * entire bus (& children). In the former case, pdev 63 * is populated, in the later case, pbus is. 64 */ 65#ifdef CONFIG_PCI_IOV 66 struct pci_dev *parent_dev; 67#endif 68 struct pci_dev *pdev; 69 struct pci_bus *pbus; 70 71 /* Effective RID (device RID for a device PE and base bus 72 * RID with devfn 0 for a bus PE) 73 */ 74 unsigned int rid; 75 76 /* PE number */ 77 unsigned int pe_number; 78 79 /* "Base" iommu table, ie, 4K TCEs, 32-bit DMA */ 80 struct iommu_table_group table_group; 81 82 /* 64-bit TCE bypass region */ 83 bool tce_bypass_enabled; 84 uint64_t tce_bypass_base; 85 86 /* 87 * Used to track whether we've done DMA setup for this PE or not. We 88 * want to defer allocating TCE tables, etc until we've added a 89 * non-bridge device to the PE. 90 */ 91 bool dma_setup_done; 92 93 /* MSIs. MVE index is identical for 32 and 64 bit MSI 94 * and -1 if not supported. (It's actually identical to the 95 * PE number) 96 */ 97 int mve_number; 98 99 /* PEs in compound case */ 100 struct pnv_ioda_pe *master; 101 struct list_head slaves; 102 103 /* Link in list of PE#s */ 104 struct list_head list; 105}; 106 107#define PNV_PHB_FLAG_EEH (1 << 0) 108 109struct pnv_phb { 110 struct pci_controller *hose; 111 enum pnv_phb_type type; 112 enum pnv_phb_model model; 113 u64 hub_id; 114 u64 opal_id; 115 int flags; 116 void __iomem *regs; 117 u64 regs_phys; 118 spinlock_t lock; 119 120#ifdef CONFIG_DEBUG_FS 121 int has_dbgfs; 122 struct dentry *dbgfs; 123#endif 124 125 unsigned int msi_base; 126 struct msi_bitmap msi_bmp; 127 int (*init_m64)(struct pnv_phb *phb); 128 int (*get_pe_state)(struct pnv_phb *phb, int pe_no); 129 void (*freeze_pe)(struct pnv_phb *phb, int pe_no); 130 int (*unfreeze_pe)(struct pnv_phb *phb, int pe_no, int opt); 131 132 struct { 133 /* Global bridge info */ 134 unsigned int total_pe_num; 135 unsigned int reserved_pe_idx; 136 unsigned int root_pe_idx; 137 138 /* 32-bit MMIO window */ 139 unsigned int m32_size; 140 unsigned int m32_segsize; 141 unsigned int m32_pci_base; 142 143 /* 64-bit MMIO window */ 144 unsigned int m64_bar_idx; 145 unsigned long m64_size; 146 unsigned long m64_segsize; 147 unsigned long m64_base; 148#define MAX_M64_BARS 64 149 unsigned long m64_bar_alloc; 150 151 /* IO ports */ 152 unsigned int io_size; 153 unsigned int io_segsize; 154 unsigned int io_pci_base; 155 156 /* PE allocation */ 157 struct mutex pe_alloc_mutex; 158 unsigned long *pe_alloc; 159 struct pnv_ioda_pe *pe_array; 160 161 /* M32 & IO segment maps */ 162 unsigned int *m64_segmap; 163 unsigned int *m32_segmap; 164 unsigned int *io_segmap; 165 166 /* DMA32 segment maps - IODA1 only */ 167 unsigned int dma32_count; 168 unsigned int *dma32_segmap; 169 170 /* IRQ chip */ 171 int irq_chip_init; 172 struct irq_chip irq_chip; 173 174 /* Sorted list of used PE's based 175 * on the sequence of creation 176 */ 177 struct list_head pe_list; 178 struct mutex pe_list_mutex; 179 180 /* Reverse map of PEs, indexed by {bus, devfn} */ 181 unsigned int pe_rmap[0x10000]; 182 } ioda; 183 184 /* PHB and hub diagnostics */ 185 unsigned int diag_data_size; 186 u8 *diag_data; 187}; 188 189 190/* IODA PE management */ 191 192static inline bool pnv_pci_is_m64(struct pnv_phb *phb, struct resource *r) 193{ 194 /* 195 * WARNING: We cannot rely on the resource flags. The Linux PCI 196 * allocation code sometimes decides to put a 64-bit prefetchable 197 * BAR in the 32-bit window, so we have to compare the addresses. 198 * 199 * For simplicity we only test resource start. 200 */ 201 return (r->start >= phb->ioda.m64_base && 202 r->start < (phb->ioda.m64_base + phb->ioda.m64_size)); 203} 204 205static inline bool pnv_pci_is_m64_flags(unsigned long resource_flags) 206{ 207 unsigned long flags = (IORESOURCE_MEM_64 | IORESOURCE_PREFETCH); 208 209 return (resource_flags & flags) == flags; 210} 211 212int pnv_ioda_configure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe); 213int pnv_ioda_deconfigure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe); 214 215void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe); 216void pnv_pci_ioda2_release_pe_dma(struct pnv_ioda_pe *pe); 217 218struct pnv_ioda_pe *pnv_ioda_alloc_pe(struct pnv_phb *phb, int count); 219void pnv_ioda_free_pe(struct pnv_ioda_pe *pe); 220 221#ifdef CONFIG_PCI_IOV 222/* 223 * For SR-IOV we want to put each VF's MMIO resource in to a separate PE. 224 * This requires a bit of acrobatics with the MMIO -> PE configuration 225 * and this structure is used to keep track of it all. 226 */ 227struct pnv_iov_data { 228 /* number of VFs enabled */ 229 u16 num_vfs; 230 231 /* pointer to the array of VF PEs. num_vfs long*/ 232 struct pnv_ioda_pe *vf_pe_arr; 233 234 /* Did we map the VF BAR with single-PE IODA BARs? */ 235 bool m64_single_mode[PCI_SRIOV_NUM_BARS]; 236 237 /* 238 * True if we're using any segmented windows. In that case we need 239 * shift the start of the IOV resource the segment corresponding to 240 * the allocated PE. 241 */ 242 bool need_shift; 243 244 /* 245 * Bit mask used to track which m64 windows are used to map the 246 * SR-IOV BARs for this device. 247 */ 248 DECLARE_BITMAP(used_m64_bar_mask, MAX_M64_BARS); 249 250 /* 251 * If we map the SR-IOV BARs with a segmented window then 252 * parts of that window will be "claimed" by other PEs. 253 * 254 * "holes" here is used to reserve the leading portion 255 * of the window that is used by other (non VF) PEs. 256 */ 257 struct resource holes[PCI_SRIOV_NUM_BARS]; 258}; 259 260static inline struct pnv_iov_data *pnv_iov_get(struct pci_dev *pdev) 261{ 262 return pdev->dev.archdata.iov_data; 263} 264 265void pnv_pci_ioda_fixup_iov(struct pci_dev *pdev); 266resource_size_t pnv_pci_iov_resource_alignment(struct pci_dev *pdev, int resno); 267 268int pnv_pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs); 269int pnv_pcibios_sriov_disable(struct pci_dev *pdev); 270#endif /* CONFIG_PCI_IOV */ 271 272extern struct pci_ops pnv_pci_ops; 273 274void pnv_pci_dump_phb_diag_data(struct pci_controller *hose, 275 unsigned char *log_buff); 276int pnv_pci_cfg_read(struct pci_dn *pdn, 277 int where, int size, u32 *val); 278int pnv_pci_cfg_write(struct pci_dn *pdn, 279 int where, int size, u32 val); 280extern struct iommu_table *pnv_pci_table_alloc(int nid); 281 282extern void pnv_pci_init_ioda_hub(struct device_node *np); 283extern void pnv_pci_init_ioda2_phb(struct device_node *np); 284extern void pnv_pci_init_npu2_opencapi_phb(struct device_node *np); 285extern void pnv_pci_reset_secondary_bus(struct pci_dev *dev); 286extern int pnv_eeh_phb_reset(struct pci_controller *hose, int option); 287 288extern struct pnv_ioda_pe *pnv_pci_bdfn_to_pe(struct pnv_phb *phb, u16 bdfn); 289extern struct pnv_ioda_pe *pnv_ioda_get_pe(struct pci_dev *dev); 290extern void pnv_set_msi_irq_chip(struct pnv_phb *phb, unsigned int virq); 291extern unsigned long pnv_pci_ioda2_get_table_size(__u32 page_shift, 292 __u64 window_size, __u32 levels); 293extern int pnv_eeh_post_init(void); 294 295__printf(3, 4) 296extern void pe_level_printk(const struct pnv_ioda_pe *pe, const char *level, 297 const char *fmt, ...); 298#define pe_err(pe, fmt, ...) \ 299 pe_level_printk(pe, KERN_ERR, fmt, ##__VA_ARGS__) 300#define pe_warn(pe, fmt, ...) \ 301 pe_level_printk(pe, KERN_WARNING, fmt, ##__VA_ARGS__) 302#define pe_info(pe, fmt, ...) \ 303 pe_level_printk(pe, KERN_INFO, fmt, ##__VA_ARGS__) 304 305/* pci-ioda-tce.c */ 306#define POWERNV_IOMMU_DEFAULT_LEVELS 2 307#define POWERNV_IOMMU_MAX_LEVELS 5 308 309extern int pnv_tce_build(struct iommu_table *tbl, long index, long npages, 310 unsigned long uaddr, enum dma_data_direction direction, 311 unsigned long attrs); 312extern void pnv_tce_free(struct iommu_table *tbl, long index, long npages); 313extern int pnv_tce_xchg(struct iommu_table *tbl, long index, 314 unsigned long *hpa, enum dma_data_direction *direction); 315extern __be64 *pnv_tce_useraddrptr(struct iommu_table *tbl, long index, 316 bool alloc); 317extern unsigned long pnv_tce_get(struct iommu_table *tbl, long index); 318 319extern long pnv_pci_ioda2_table_alloc_pages(int nid, __u64 bus_offset, 320 __u32 page_shift, __u64 window_size, __u32 levels, 321 bool alloc_userspace_copy, struct iommu_table *tbl); 322extern void pnv_pci_ioda2_table_free_pages(struct iommu_table *tbl); 323 324extern long pnv_pci_link_table_and_group(int node, int num, 325 struct iommu_table *tbl, 326 struct iommu_table_group *table_group); 327extern void pnv_pci_unlink_table_and_group(struct iommu_table *tbl, 328 struct iommu_table_group *table_group); 329extern void pnv_pci_setup_iommu_table(struct iommu_table *tbl, 330 void *tce_mem, u64 tce_size, 331 u64 dma_offset, unsigned int page_shift); 332 333extern unsigned long pnv_ioda_parse_tce_sizes(struct pnv_phb *phb); 334 335static inline struct pnv_phb *pci_bus_to_pnvhb(struct pci_bus *bus) 336{ 337 struct pci_controller *hose = bus->sysdata; 338 339 if (hose) 340 return hose->private_data; 341 342 return NULL; 343} 344 345#endif /* __POWERNV_PCI_H */