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drm_pci.c revision 1.46
      1 /*	$NetBSD: drm_pci.c,v 1.46 2021/12/19 11:53:51 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: drm_pci.c,v 1.46 2021/12/19 11:53:51 riastradh Exp $");
     34 
     35 #include <sys/types.h>
     36 #include <sys/errno.h>
     37 #include <sys/systm.h>
     38 
     39 #include <dev/pci/pcivar.h>
     40 
     41 #include <linux/err.h>
     42 #include <drm/drm_agpsupport.h>
     43 #include <drm/drm_device.h>
     44 #include <drm/drm_drv.h>
     45 #include <drm/drm_legacy.h>
     46 #include <drm/drm_pci.h>
     47 
     48 #include "../dist/drm/drm_internal.h"
     49 
     50 struct drm_bus_irq_cookie {
     51 	pci_intr_handle_t *intr_handles;
     52 	void *ih_cookie;
     53 };
     54 
     55 static const struct pci_attach_args *
     56 drm_pci_attach_args(struct drm_device *dev)
     57 {
     58 	return &dev->pdev->pd_pa;
     59 }
     60 
     61 int
     62 drm_pci_attach(struct drm_device *dev, struct pci_dev *pdev)
     63 {
     64 	device_t self = dev->dev;
     65 	const struct pci_attach_args *pa = &pdev->pd_pa;
     66 	unsigned int unit;
     67 	int ret;
     68 
     69 	/* Ensure the drm agp hooks are initialized.  */
     70 	/* XXX errno NetBSD->Linux */
     71 	ret = -drm_guarantee_initialized();
     72 	if (ret)
     73 		return ret;
     74 
     75 	dev->pdev = pdev;
     76 
     77 	/* XXX Set the power state to D0?  */
     78 
     79 	/* Set up the bus space and bus DMA tags.  */
     80 	dev->bst = pa->pa_memt;
     81 	dev->bus_dmat = (pci_dma64_available(pa)? pa->pa_dmat64 : pa->pa_dmat);
     82 	dev->bus_dmat32 = pa->pa_dmat;
     83 	dev->dmat = dev->bus_dmat;
     84 	dev->dmat_subregion_p = false;
     85 	dev->dmat_subregion_min = 0;
     86 	dev->dmat_subregion_max = __type_max(bus_addr_t);
     87 
     88 	/* Find all the memory maps.  */
     89 	CTASSERT(PCI_NUM_RESOURCES < (SIZE_MAX / sizeof(dev->bus_maps[0])));
     90 	dev->bus_maps = kmem_zalloc(PCI_NUM_RESOURCES *
     91 	    sizeof(dev->bus_maps[0]), KM_SLEEP);
     92 	dev->bus_nmaps = PCI_NUM_RESOURCES;
     93 	for (unit = 0; unit < PCI_NUM_RESOURCES; unit++) {
     94 		struct drm_bus_map *const bm = &dev->bus_maps[unit];
     95 		const int reg = PCI_BAR(unit);
     96 		const pcireg_t type =
     97 		    pci_mapreg_type(pa->pa_pc, pa->pa_tag, reg);
     98 
     99 		/* Reject non-memory mappings.  */
    100 		if ((type & PCI_MAPREG_TYPE_MEM) != PCI_MAPREG_TYPE_MEM) {
    101 			aprint_debug_dev(self, "map %u has non-memory type:"
    102 			    " 0x%"PRIxMAX"\n", unit, (uintmax_t)type);
    103 			continue;
    104 		}
    105 
    106 		/*
    107 		 * If it's a 64-bit mapping, don't interpret the second
    108 		 * half of it as another BAR in the next iteration of
    109 		 * the loop -- move on to the next unit.
    110 		 */
    111 		if (PCI_MAPREG_MEM_TYPE(type) == PCI_MAPREG_MEM_TYPE_64BIT)
    112 			unit++;
    113 
    114 		/* Inquire about it.  We'll map it in drm_legacy_ioremap.  */
    115 		if (pci_mapreg_info(pa->pa_pc, pa->pa_tag, reg, type,
    116 			&bm->bm_base, &bm->bm_size, &bm->bm_flags) != 0) {
    117 			aprint_debug_dev(self, "map %u failed\n", unit);
    118 			continue;
    119 		}
    120 
    121 		/* Assume since it is a memory mapping it can be linear.  */
    122 		bm->bm_flags |= BUS_SPACE_MAP_LINEAR;
    123 	}
    124 
    125 	/* Set up AGP stuff if requested.  */
    126 	if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
    127 		if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP))
    128 			dev->agp = drm_agp_init(dev);
    129 		if (dev->agp)
    130 			dev->agp->agp_mtrr = arch_phys_wc_add(dev->agp->base,
    131 				dev->agp->agp_info.aki_info.ai_aperture_size);
    132 	}
    133 
    134 	/* Success!  */
    135 	return 0;
    136 }
    137 
    138 void
    139 drm_pci_detach(struct drm_device *dev)
    140 {
    141 
    142 	/* Tear down AGP stuff if necessary.  */
    143 	drm_pci_agp_destroy(dev);
    144 
    145 	/* Free the record of available bus space mappings.  */
    146 	dev->bus_nmaps = 0;
    147 	kmem_free(dev->bus_maps, PCI_NUM_RESOURCES * sizeof(dev->bus_maps[0]));
    148 
    149 	/* Tear down bus space and bus DMA tags.  */
    150 	if (dev->dmat_subregion_p) {
    151 		bus_dmatag_destroy(dev->dmat);
    152 	}
    153 }
    154 
    155 void
    156 drm_pci_agp_destroy(struct drm_device *dev)
    157 {
    158 
    159 	if (dev->agp) {
    160 		arch_phys_wc_del(dev->agp->agp_mtrr);
    161 		drm_agp_fini(dev);
    162 		KASSERT(dev->agp == NULL);
    163 	}
    164 }
    165 
    166 int
    167 drm_pci_request_irq(struct drm_device *dev, int flags)
    168 {
    169 	const char *const name = device_xname(dev->dev);
    170 	int (*const handler)(void *) = dev->driver->irq_handler;
    171 	const struct pci_attach_args *const pa = drm_pci_attach_args(dev);
    172 	const char *intrstr;
    173 	char intrbuf[PCI_INTRSTR_LEN];
    174 	struct drm_bus_irq_cookie *irq_cookie;
    175 
    176 	irq_cookie = kmem_alloc(sizeof(*irq_cookie), KM_SLEEP);
    177 
    178 	if (dev->pdev->msi_enabled) {
    179 		if (dev->pdev->pd_intr_handles == NULL) {
    180 			if (pci_msi_alloc_exact(pa, &irq_cookie->intr_handles,
    181 			    1)) {
    182 				aprint_error_dev(dev->dev,
    183 				    "couldn't allocate MSI (%s)\n", name);
    184 				goto error;
    185 			}
    186 		} else {
    187 			irq_cookie->intr_handles = dev->pdev->pd_intr_handles;
    188 			dev->pdev->pd_intr_handles = NULL;
    189 		}
    190 	} else {
    191 		if (pci_intx_alloc(pa, &irq_cookie->intr_handles)) {
    192 			aprint_error_dev(dev->dev,
    193 			    "couldn't allocate INTx interrupt (%s)\n", name);
    194 			goto error;
    195 		}
    196 	}
    197 
    198 	intrstr = pci_intr_string(pa->pa_pc, irq_cookie->intr_handles[0],
    199 	    intrbuf, sizeof(intrbuf));
    200 	irq_cookie->ih_cookie = pci_intr_establish_xname(pa->pa_pc,
    201 	    irq_cookie->intr_handles[0], IPL_DRM, handler, dev, name);
    202 	if (irq_cookie->ih_cookie == NULL) {
    203 		aprint_error_dev(dev->dev,
    204 		    "couldn't establish interrupt at %s (%s)\n", intrstr, name);
    205 		pci_intr_release(pa->pa_pc, irq_cookie->intr_handles, 1);
    206 		goto error;
    207 	}
    208 
    209 	aprint_normal_dev(dev->dev, "interrupting at %s (%s)\n", intrstr, name);
    210 	dev->irq_cookie = irq_cookie;
    211 	return 0;
    212 
    213 error:
    214 	kmem_free(irq_cookie, sizeof(*irq_cookie));
    215 	return -ENOENT;
    216 }
    217 
    218 void
    219 drm_pci_free_irq(struct drm_device *dev)
    220 {
    221 	struct drm_bus_irq_cookie *const cookie = dev->irq_cookie;
    222 	const struct pci_attach_args *pa = drm_pci_attach_args(dev);
    223 
    224 	pci_intr_disestablish(pa->pa_pc, cookie->ih_cookie);
    225 	pci_intr_release(pa->pa_pc, cookie->intr_handles, 1);
    226 	kmem_free(cookie, sizeof(*cookie));
    227 	dev->irq_cookie = NULL;
    228 }
    229