Michael Neuling | 6f7f0b3 | 2015-05-27 16:07:18 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014 IBM Corp. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/pci.h> |
| 11 | #include <misc/cxl.h> |
| 12 | #include "cxl.h" |
| 13 | |
| 14 | static int cxl_dma_set_mask(struct pci_dev *pdev, u64 dma_mask) |
| 15 | { |
| 16 | if (dma_mask < DMA_BIT_MASK(64)) { |
| 17 | pr_info("%s only 64bit DMA supported on CXL", __func__); |
| 18 | return -EIO; |
| 19 | } |
| 20 | |
| 21 | *(pdev->dev.dma_mask) = dma_mask; |
| 22 | return 0; |
| 23 | } |
| 24 | |
| 25 | static int cxl_pci_probe_mode(struct pci_bus *bus) |
| 26 | { |
| 27 | return PCI_PROBE_NORMAL; |
| 28 | } |
| 29 | |
| 30 | static int cxl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) |
| 31 | { |
| 32 | return -ENODEV; |
| 33 | } |
| 34 | |
| 35 | static void cxl_teardown_msi_irqs(struct pci_dev *pdev) |
| 36 | { |
| 37 | /* |
| 38 | * MSI should never be set but need still need to provide this call |
| 39 | * back. |
| 40 | */ |
| 41 | } |
| 42 | |
| 43 | static bool cxl_pci_enable_device_hook(struct pci_dev *dev) |
| 44 | { |
| 45 | struct pci_controller *phb; |
| 46 | struct cxl_afu *afu; |
| 47 | struct cxl_context *ctx; |
| 48 | |
| 49 | phb = pci_bus_to_host(dev->bus); |
| 50 | afu = (struct cxl_afu *)phb->private_data; |
| 51 | set_dma_ops(&dev->dev, &dma_direct_ops); |
| 52 | set_dma_offset(&dev->dev, PAGE_OFFSET); |
| 53 | |
| 54 | /* |
| 55 | * Allocate a context to do cxl things too. If we eventually do real |
| 56 | * DMA ops, we'll need a default context to attach them to |
| 57 | */ |
| 58 | ctx = cxl_dev_context_init(dev); |
| 59 | if (!ctx) |
| 60 | return false; |
| 61 | dev->dev.archdata.cxl_ctx = ctx; |
| 62 | |
| 63 | return (cxl_afu_check_and_enable(afu) == 0); |
| 64 | } |
| 65 | |
| 66 | static void cxl_pci_disable_device(struct pci_dev *dev) |
| 67 | { |
| 68 | struct cxl_context *ctx = cxl_get_context(dev); |
| 69 | |
| 70 | if (ctx) { |
| 71 | if (ctx->status == STARTED) { |
| 72 | dev_err(&dev->dev, "Default context started\n"); |
| 73 | return; |
| 74 | } |
Michael Neuling | f67b493 | 2015-06-05 14:38:26 +1000 | [diff] [blame] | 75 | dev->dev.archdata.cxl_ctx = NULL; |
Michael Neuling | 6f7f0b3 | 2015-05-27 16:07:18 +1000 | [diff] [blame] | 76 | cxl_release_context(ctx); |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | static resource_size_t cxl_pci_window_alignment(struct pci_bus *bus, |
| 81 | unsigned long type) |
| 82 | { |
| 83 | return 1; |
| 84 | } |
| 85 | |
| 86 | static void cxl_pci_reset_secondary_bus(struct pci_dev *dev) |
| 87 | { |
| 88 | /* Should we do an AFU reset here ? */ |
| 89 | } |
| 90 | |
| 91 | static int cxl_pcie_cfg_record(u8 bus, u8 devfn) |
| 92 | { |
| 93 | return (bus << 8) + devfn; |
| 94 | } |
| 95 | |
| 96 | static unsigned long cxl_pcie_cfg_addr(struct pci_controller* phb, |
| 97 | u8 bus, u8 devfn, int offset) |
| 98 | { |
| 99 | int record = cxl_pcie_cfg_record(bus, devfn); |
| 100 | |
| 101 | return (unsigned long)phb->cfg_addr + ((unsigned long)phb->cfg_data * record) + offset; |
| 102 | } |
| 103 | |
| 104 | |
| 105 | static int cxl_pcie_config_info(struct pci_bus *bus, unsigned int devfn, |
| 106 | int offset, int len, |
| 107 | volatile void __iomem **ioaddr, |
| 108 | u32 *mask, int *shift) |
| 109 | { |
| 110 | struct pci_controller *phb; |
| 111 | struct cxl_afu *afu; |
| 112 | unsigned long addr; |
| 113 | |
| 114 | phb = pci_bus_to_host(bus); |
Michael Neuling | 6f7f0b3 | 2015-05-27 16:07:18 +1000 | [diff] [blame] | 115 | if (phb == NULL) |
| 116 | return PCIBIOS_DEVICE_NOT_FOUND; |
Maninder Singh | 14f2118 | 2015-06-29 16:05:11 +0530 | [diff] [blame] | 117 | afu = (struct cxl_afu *)phb->private_data; |
| 118 | |
Michael Neuling | 6f7f0b3 | 2015-05-27 16:07:18 +1000 | [diff] [blame] | 119 | if (cxl_pcie_cfg_record(bus->number, devfn) > afu->crs_num) |
| 120 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 121 | if (offset >= (unsigned long)phb->cfg_data) |
| 122 | return PCIBIOS_BAD_REGISTER_NUMBER; |
| 123 | addr = cxl_pcie_cfg_addr(phb, bus->number, devfn, offset); |
| 124 | |
| 125 | *ioaddr = (void *)(addr & ~0x3ULL); |
| 126 | *shift = ((addr & 0x3) * 8); |
| 127 | switch (len) { |
| 128 | case 1: |
| 129 | *mask = 0xff; |
| 130 | break; |
| 131 | case 2: |
| 132 | *mask = 0xffff; |
| 133 | break; |
| 134 | default: |
| 135 | *mask = 0xffffffff; |
| 136 | break; |
| 137 | } |
| 138 | return 0; |
| 139 | } |
| 140 | |
Daniel Axtens | 0b3f9c7 | 2015-08-14 17:41:18 +1000 | [diff] [blame] | 141 | |
| 142 | static inline bool cxl_config_link_ok(struct pci_bus *bus) |
| 143 | { |
| 144 | struct pci_controller *phb; |
| 145 | struct cxl_afu *afu; |
| 146 | |
| 147 | /* Config space IO is based on phb->cfg_addr, which is based on |
| 148 | * afu_desc_mmio. This isn't safe to read/write when the link |
| 149 | * goes down, as EEH tears down MMIO space. |
| 150 | * |
| 151 | * Check if the link is OK before proceeding. |
| 152 | */ |
| 153 | |
| 154 | phb = pci_bus_to_host(bus); |
| 155 | if (phb == NULL) |
| 156 | return false; |
| 157 | afu = (struct cxl_afu *)phb->private_data; |
| 158 | return cxl_adapter_link_ok(afu->adapter); |
| 159 | } |
| 160 | |
Michael Neuling | 6f7f0b3 | 2015-05-27 16:07:18 +1000 | [diff] [blame] | 161 | static int cxl_pcie_read_config(struct pci_bus *bus, unsigned int devfn, |
| 162 | int offset, int len, u32 *val) |
| 163 | { |
| 164 | volatile void __iomem *ioaddr; |
| 165 | int shift, rc; |
| 166 | u32 mask; |
| 167 | |
| 168 | rc = cxl_pcie_config_info(bus, devfn, offset, len, &ioaddr, |
| 169 | &mask, &shift); |
| 170 | if (rc) |
| 171 | return rc; |
| 172 | |
Daniel Axtens | 0b3f9c7 | 2015-08-14 17:41:18 +1000 | [diff] [blame] | 173 | if (!cxl_config_link_ok(bus)) |
| 174 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 175 | |
Michael Neuling | 6f7f0b3 | 2015-05-27 16:07:18 +1000 | [diff] [blame] | 176 | /* Can only read 32 bits */ |
| 177 | *val = (in_le32(ioaddr) >> shift) & mask; |
| 178 | return PCIBIOS_SUCCESSFUL; |
| 179 | } |
| 180 | |
| 181 | static int cxl_pcie_write_config(struct pci_bus *bus, unsigned int devfn, |
| 182 | int offset, int len, u32 val) |
| 183 | { |
| 184 | volatile void __iomem *ioaddr; |
| 185 | u32 v, mask; |
| 186 | int shift, rc; |
| 187 | |
| 188 | rc = cxl_pcie_config_info(bus, devfn, offset, len, &ioaddr, |
| 189 | &mask, &shift); |
| 190 | if (rc) |
| 191 | return rc; |
| 192 | |
Daniel Axtens | 0b3f9c7 | 2015-08-14 17:41:18 +1000 | [diff] [blame] | 193 | if (!cxl_config_link_ok(bus)) |
| 194 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 195 | |
Michael Neuling | 6f7f0b3 | 2015-05-27 16:07:18 +1000 | [diff] [blame] | 196 | /* Can only write 32 bits so do read-modify-write */ |
| 197 | mask <<= shift; |
| 198 | val <<= shift; |
| 199 | |
| 200 | v = (in_le32(ioaddr) & ~mask) || (val & mask); |
| 201 | |
| 202 | out_le32(ioaddr, v); |
| 203 | return PCIBIOS_SUCCESSFUL; |
| 204 | } |
| 205 | |
| 206 | static struct pci_ops cxl_pcie_pci_ops = |
| 207 | { |
| 208 | .read = cxl_pcie_read_config, |
| 209 | .write = cxl_pcie_write_config, |
| 210 | }; |
| 211 | |
| 212 | |
| 213 | static struct pci_controller_ops cxl_pci_controller_ops = |
| 214 | { |
| 215 | .probe_mode = cxl_pci_probe_mode, |
| 216 | .enable_device_hook = cxl_pci_enable_device_hook, |
| 217 | .disable_device = cxl_pci_disable_device, |
| 218 | .release_device = cxl_pci_disable_device, |
| 219 | .window_alignment = cxl_pci_window_alignment, |
| 220 | .reset_secondary_bus = cxl_pci_reset_secondary_bus, |
| 221 | .setup_msi_irqs = cxl_setup_msi_irqs, |
| 222 | .teardown_msi_irqs = cxl_teardown_msi_irqs, |
| 223 | .dma_set_mask = cxl_dma_set_mask, |
| 224 | }; |
| 225 | |
| 226 | int cxl_pci_vphb_add(struct cxl_afu *afu) |
| 227 | { |
| 228 | struct pci_dev *phys_dev; |
| 229 | struct pci_controller *phb, *phys_phb; |
| 230 | |
| 231 | phys_dev = to_pci_dev(afu->adapter->dev.parent); |
| 232 | phys_phb = pci_bus_to_host(phys_dev->bus); |
| 233 | |
| 234 | /* Alloc and setup PHB data structure */ |
| 235 | phb = pcibios_alloc_controller(phys_phb->dn); |
| 236 | |
| 237 | if (!phb) |
| 238 | return -ENODEV; |
| 239 | |
| 240 | /* Setup parent in sysfs */ |
| 241 | phb->parent = &phys_dev->dev; |
| 242 | |
| 243 | /* Setup the PHB using arch provided callback */ |
| 244 | phb->ops = &cxl_pcie_pci_ops; |
| 245 | phb->cfg_addr = afu->afu_desc_mmio + afu->crs_offset; |
| 246 | phb->cfg_data = (void *)(u64)afu->crs_len; |
| 247 | phb->private_data = afu; |
| 248 | phb->controller_ops = cxl_pci_controller_ops; |
| 249 | |
| 250 | /* Scan the bus */ |
| 251 | pcibios_scan_phb(phb); |
| 252 | if (phb->bus == NULL) |
| 253 | return -ENXIO; |
| 254 | |
| 255 | /* Claim resources. This might need some rework as well depending |
| 256 | * whether we are doing probe-only or not, like assigning unassigned |
| 257 | * resources etc... |
| 258 | */ |
| 259 | pcibios_claim_one_bus(phb->bus); |
| 260 | |
| 261 | /* Add probed PCI devices to the device model */ |
| 262 | pci_bus_add_devices(phb->bus); |
| 263 | |
| 264 | afu->phb = phb; |
| 265 | |
| 266 | return 0; |
| 267 | } |
| 268 | |
Daniel Axtens | 9e8df8a | 2015-08-14 17:41:26 +1000 | [diff] [blame] | 269 | void cxl_pci_vphb_reconfigure(struct cxl_afu *afu) |
| 270 | { |
| 271 | /* When we are reconfigured, the AFU's MMIO space is unmapped |
| 272 | * and remapped. We need to reflect this in the PHB's view of |
| 273 | * the world. |
| 274 | */ |
| 275 | afu->phb->cfg_addr = afu->afu_desc_mmio + afu->crs_offset; |
| 276 | } |
Michael Neuling | 6f7f0b3 | 2015-05-27 16:07:18 +1000 | [diff] [blame] | 277 | |
| 278 | void cxl_pci_vphb_remove(struct cxl_afu *afu) |
| 279 | { |
| 280 | struct pci_controller *phb; |
| 281 | |
| 282 | /* If there is no configuration record we won't have one of these */ |
| 283 | if (!afu || !afu->phb) |
| 284 | return; |
| 285 | |
| 286 | phb = afu->phb; |
| 287 | |
| 288 | pci_remove_root_bus(phb->bus); |
| 289 | } |
| 290 | |
| 291 | struct cxl_afu *cxl_pci_to_afu(struct pci_dev *dev) |
| 292 | { |
| 293 | struct pci_controller *phb; |
| 294 | |
| 295 | phb = pci_bus_to_host(dev->bus); |
| 296 | |
| 297 | return (struct cxl_afu *)phb->private_data; |
| 298 | } |
| 299 | EXPORT_SYMBOL_GPL(cxl_pci_to_afu); |
| 300 | |
| 301 | unsigned int cxl_pci_to_cfg_record(struct pci_dev *dev) |
| 302 | { |
| 303 | return cxl_pcie_cfg_record(dev->bus->number, dev->devfn); |
| 304 | } |
| 305 | EXPORT_SYMBOL_GPL(cxl_pci_to_cfg_record); |