1 /* 2 * Copyright 2003 José Fonseca. 3 * Copyright 2003 Leif Delgass. 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice (including the next 14 * paragraph) shall be included in all copies or substantial portions of the 15 * Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 20 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 21 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 23 */ 24 25 #include <drm/drmP.h> 26 #include <drm/drm_legacy.h> 27 28 /**********************************************************************/ 29 /** \name PCI memory */ 30 /*@{*/ 31 32 static void 33 drm_pci_busdma_callback(void *arg, bus_dma_segment_t *segs, int nsegs, int error) 34 { 35 drm_dma_handle_t *dmah = arg; 36 37 if (error != 0) 38 return; 39 40 KASSERT(nsegs == 1, ("drm_pci_busdma_callback: bad dma segment count")); 41 dmah->busaddr = segs[0].ds_addr; 42 } 43 44 /** 45 * \brief Allocate a PCI consistent memory block, for DMA. 46 */ 47 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align) 48 { 49 drm_dma_handle_t *dmah; 50 int ret; 51 52 /* pci_alloc_consistent only guarantees alignment to the smallest 53 * PAGE_SIZE order which is greater than or equal to the requested size. 54 * Return NULL here for now to make sure nobody tries for larger alignment 55 */ 56 if (align > size) 57 return NULL; 58 59 /* Need power-of-two alignment, so fail the allocation if it isn't. */ 60 if ((align & (align - 1)) != 0) { 61 DRM_ERROR("drm_pci_alloc with non-power-of-two alignment %d\n", 62 (int)align); 63 return NULL; 64 } 65 66 dmah = kmalloc(sizeof(drm_dma_handle_t), M_DRM, M_WAITOK | M_NULLOK); 67 if (!dmah) 68 return NULL; 69 70 dmah->size = size; 71 72 ret = bus_dma_tag_create(NULL, align, 0, /* tag, align, boundary */ 73 ~0, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */ 74 NULL, NULL, /* filtfunc, filtfuncargs */ 75 size, 1, size, /* maxsize, nsegs, maxsegsize */ 76 0, /* flags */ 77 &dmah->tag); 78 if (ret != 0) { 79 drm_free(dmah, M_DRM); 80 return NULL; 81 } 82 83 ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr, 84 BUS_DMA_WAITOK | BUS_DMA_ZERO | BUS_DMA_NOCACHE, &dmah->map); 85 if (ret != 0) { 86 bus_dma_tag_destroy(dmah->tag); 87 drm_free(dmah, M_DRM); 88 return NULL; 89 } 90 91 ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr, size, 92 drm_pci_busdma_callback, dmah, BUS_DMA_NOWAIT); 93 if (ret != 0) { 94 bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map); 95 bus_dma_tag_destroy(dmah->tag); 96 drm_free(dmah, M_DRM); 97 return NULL; 98 } 99 100 memset(dmah->vaddr, 0, size); 101 102 return dmah; 103 } 104 105 /* 106 * Free a PCI consistent memory block without freeing its descriptor. 107 * 108 * This function is for internal use in the Linux-specific DRM core code. 109 */ 110 void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 111 { 112 if (dmah == NULL) 113 return; 114 115 bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map); 116 bus_dma_tag_destroy(dmah->tag); 117 } 118 119 /** 120 * drm_pci_free - Free a PCI consistent memory block 121 * @dev: DRM device 122 * @dmah: handle to memory block 123 */ 124 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 125 { 126 __drm_legacy_pci_free(dev, dmah); 127 kfree(dmah); 128 } 129 130 int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask) 131 { 132 device_t root; 133 int pos; 134 u32 lnkcap = 0, lnkcap2 = 0; 135 136 *mask = 0; 137 if (!drm_device_is_pcie(dev)) 138 return -EINVAL; 139 140 root = device_get_parent(dev->dev); 141 142 pos = 0; 143 pci_find_extcap(root, PCIY_EXPRESS, &pos); 144 if (!pos) 145 return -EINVAL; 146 147 /* we've been informed via and serverworks don't make the cut */ 148 if (pci_get_vendor(root) == PCI_VENDOR_ID_VIA || 149 pci_get_vendor(root) == PCI_VENDOR_ID_SERVERWORKS) 150 return -EINVAL; 151 152 lnkcap = pci_read_config(root, pos + PCIER_LINKCAP, 4); 153 lnkcap2 = pci_read_config(root, pos + PCIER_LINK_CAP2, 4); 154 155 lnkcap &= PCIEM_LNKCAP_SPEED_MASK; 156 lnkcap2 &= 0xfe; 157 158 #define PCI_EXP_LNKCAP2_SLS_2_5GB 0x02 /* Supported Link Speed 2.5GT/s */ 159 #define PCI_EXP_LNKCAP2_SLS_5_0GB 0x04 /* Supported Link Speed 5.0GT/s */ 160 #define PCI_EXP_LNKCAP2_SLS_8_0GB 0x08 /* Supported Link Speed 8.0GT/s */ 161 162 if (lnkcap2) { /* PCIE GEN 3.0 */ 163 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB) 164 *mask |= DRM_PCIE_SPEED_25; 165 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB) 166 *mask |= DRM_PCIE_SPEED_50; 167 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB) 168 *mask |= DRM_PCIE_SPEED_80; 169 } else { 170 if (lnkcap & 1) 171 *mask |= DRM_PCIE_SPEED_25; 172 if (lnkcap & 2) 173 *mask |= DRM_PCIE_SPEED_50; 174 } 175 176 DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", pci_get_vendor(root), pci_get_device(root), lnkcap, lnkcap2); 177 return 0; 178 } 179 180 /** 181 * Get interrupt from bus id. 182 * 183 * \param inode device inode. 184 * \param file_priv DRM file private. 185 * \param cmd command. 186 * \param arg user argument, pointing to a drm_irq_busid structure. 187 * \return zero on success or a negative number on failure. 188 * 189 * Finds the PCI device with the specified bus id and gets its IRQ number. 190 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal 191 * to that of the device that this DRM instance attached to. 192 */ 193 int drm_irq_by_busid(struct drm_device *dev, void *data, 194 struct drm_file *file_priv) 195 { 196 struct drm_irq_busid *irq = data; 197 198 if ((irq->busnum >> 8) != dev->pci_domain || 199 (irq->busnum & 0xff) != dev->pci_bus || 200 irq->devnum != dev->pci_slot || 201 irq->funcnum != dev->pci_func) 202 return -EINVAL; 203 204 irq->irq = dev->irq; 205 206 DRM_DEBUG("%d:%d:%d => IRQ %d\n", 207 irq->busnum, irq->devnum, irq->funcnum, irq->irq); 208 209 return 0; 210 } 211