sys/dev/drm/drm_pci.c

   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 }