1 /*- 2 * Copyright 2003 Eric Anholt. 3 * All Rights Reserved. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the next 13 * paragraph) shall be included in all copies or substantial portions of the 14 * Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19 * AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 21 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 22 * 23 * $FreeBSD: src/sys/dev/drm2/drm_pci.c,v 1.1 2012/05/22 11:07:44 kib Exp $ 24 */ 25 26 /** 27 * \file drm_pci.h 28 * \brief PCI consistent, DMA-accessible memory allocation. 29 * 30 * \author Eric Anholt <anholt@FreeBSD.org> 31 */ 32 33 #include <drm/drmP.h> 34 35 /**********************************************************************/ 36 /** \name PCI memory */ 37 /*@{*/ 38 39 static void 40 drm_pci_busdma_callback(void *arg, bus_dma_segment_t *segs, int nsegs, int error) 41 { 42 drm_dma_handle_t *dmah = arg; 43 44 if (error != 0) 45 return; 46 47 KASSERT(nsegs == 1, ("drm_pci_busdma_callback: bad dma segment count")); 48 dmah->busaddr = segs[0].ds_addr; 49 } 50 51 /** 52 * \brief Allocate a PCI consistent memory block, for DMA. 53 */ 54 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align) 55 { 56 drm_dma_handle_t *dmah; 57 int ret; 58 59 /* pci_alloc_consistent only guarantees alignment to the smallest 60 * PAGE_SIZE order which is greater than or equal to the requested size. 61 * Return NULL here for now to make sure nobody tries for larger alignment 62 */ 63 if (align > size) 64 return NULL; 65 66 /* Need power-of-two alignment, so fail the allocation if it isn't. */ 67 if ((align & (align - 1)) != 0) { 68 DRM_ERROR("drm_pci_alloc with non-power-of-two alignment %d\n", 69 (int)align); 70 return NULL; 71 } 72 73 dmah = kmalloc(sizeof(drm_dma_handle_t), M_DRM, M_WAITOK | M_NULLOK); 74 if (!dmah) 75 return NULL; 76 77 dmah->size = size; 78 79 ret = bus_dma_tag_create(NULL, align, 0, /* tag, align, boundary */ 80 ~0, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */ 81 NULL, NULL, /* filtfunc, filtfuncargs */ 82 size, 1, size, /* maxsize, nsegs, maxsegsize */ 83 0, /* flags */ 84 &dmah->tag); 85 if (ret != 0) { 86 drm_free(dmah, M_DRM); 87 return NULL; 88 } 89 90 ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr, 91 BUS_DMA_WAITOK | BUS_DMA_ZERO | BUS_DMA_NOCACHE, &dmah->map); 92 if (ret != 0) { 93 bus_dma_tag_destroy(dmah->tag); 94 drm_free(dmah, M_DRM); 95 return NULL; 96 } 97 98 ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr, size, 99 drm_pci_busdma_callback, dmah, BUS_DMA_NOWAIT); 100 if (ret != 0) { 101 bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map); 102 bus_dma_tag_destroy(dmah->tag); 103 drm_free(dmah, M_DRM); 104 return NULL; 105 } 106 107 memset(dmah->vaddr, 0, size); 108 109 return dmah; 110 } 111 112 /** 113 * \brief Free a DMA-accessible consistent memory block. 114 */ 115 void 116 drm_pci_free(struct drm_device *dev, drm_dma_handle_t *dmah) 117 { 118 if (dmah == NULL) 119 return; 120 121 bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map); 122 bus_dma_tag_destroy(dmah->tag); 123 124 drm_free(dmah, M_DRM); 125 } 126 127 /*@}*/ 128 129 int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask) 130 { 131 device_t root; 132 int pos; 133 u32 lnkcap = 0, lnkcap2 = 0; 134 135 *mask = 0; 136 if (!drm_device_is_pcie(dev)) 137 return -EINVAL; 138 139 root = device_get_parent(dev->dev); 140 141 pos = 0; 142 pci_find_extcap(root, PCIY_EXPRESS, &pos); 143 if (!pos) 144 return -EINVAL; 145 146 /* we've been informed via and serverworks don't make the cut */ 147 if (pci_get_vendor(root) == PCI_VENDOR_ID_VIA || 148 pci_get_vendor(root) == PCI_VENDOR_ID_SERVERWORKS) 149 return -EINVAL; 150 151 lnkcap = pci_read_config(root, pos + PCIER_LINKCAP, 4); 152 lnkcap2 = pci_read_config(root, pos + PCIER_LINK_CAP2, 4); 153 154 lnkcap &= PCIEM_LNKCAP_SPEED_MASK; 155 lnkcap2 &= 0xfe; 156 157 #define PCI_EXP_LNKCAP2_SLS_2_5GB 0x02 /* Supported Link Speed 2.5GT/s */ 158 #define PCI_EXP_LNKCAP2_SLS_5_0GB 0x04 /* Supported Link Speed 5.0GT/s */ 159 #define PCI_EXP_LNKCAP2_SLS_8_0GB 0x08 /* Supported Link Speed 8.0GT/s */ 160 161 if (lnkcap2) { /* PCIE GEN 3.0 */ 162 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB) 163 *mask |= DRM_PCIE_SPEED_25; 164 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB) 165 *mask |= DRM_PCIE_SPEED_50; 166 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB) 167 *mask |= DRM_PCIE_SPEED_80; 168 } else { 169 if (lnkcap & 1) 170 *mask |= DRM_PCIE_SPEED_25; 171 if (lnkcap & 2) 172 *mask |= DRM_PCIE_SPEED_50; 173 } 174 175 DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", pci_get_vendor(root), pci_get_device(root), lnkcap, lnkcap2); 176 return 0; 177 } 178 179 /** 180 * Get interrupt from bus id. 181 * 182 * \param inode device inode. 183 * \param file_priv DRM file private. 184 * \param cmd command. 185 * \param arg user argument, pointing to a drm_irq_busid structure. 186 * \return zero on success or a negative number on failure. 187 * 188 * Finds the PCI device with the specified bus id and gets its IRQ number. 189 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal 190 * to that of the device that this DRM instance attached to. 191 */ 192 int drm_irq_by_busid(struct drm_device *dev, void *data, 193 struct drm_file *file_priv) 194 { 195 struct drm_irq_busid *irq = data; 196 197 if ((irq->busnum >> 8) != dev->pci_domain || 198 (irq->busnum & 0xff) != dev->pci_bus || 199 irq->devnum != dev->pci_slot || 200 irq->funcnum != dev->pci_func) 201 return EINVAL; 202 203 irq->irq = dev->irq; 204 205 DRM_DEBUG("%d:%d:%d => IRQ %d\n", 206 irq->busnum, irq->devnum, irq->funcnum, irq->irq); 207 208 return 0; 209 } 210