^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * psb GEM interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2011, Intel Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Authors: Alan Cox
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * TODO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * - we need to work out if the MMU is relevant (eg for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * accelerated operations on a GEM object)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <drm/drm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <drm/drm_vma_manager.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include "psb_drv.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) void psb_gem_free_object(struct drm_gem_object *obj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct gtt_range *gtt = container_of(obj, struct gtt_range, gem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /* Remove the list map if one is present */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) drm_gem_free_mmap_offset(obj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) drm_gem_object_release(obj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) /* This must occur last as it frees up the memory of the GEM object */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) psb_gtt_free_range(obj->dev, gtt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) int psb_gem_get_aperture(struct drm_device *dev, void *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct drm_file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * psb_gem_create - create a mappable object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * @file: the DRM file of the client
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * @dev: our device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * @size: the size requested
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * @handlep: returned handle (opaque number)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * Create a GEM object, fill in the boilerplate and attach a handle to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * it so that userspace can speak about it. This does the core work
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * for the various methods that do/will create GEM objects for things
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) int psb_gem_create(struct drm_file *file, struct drm_device *dev, u64 size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) u32 *handlep, int stolen, u32 align)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct gtt_range *r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) u32 handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) size = roundup(size, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /* Allocate our object - for now a direct gtt range which is not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) stolen memory backed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) r = psb_gtt_alloc_range(dev, size, "gem", 0, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (r == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) dev_err(dev->dev, "no memory for %lld byte GEM object\n", size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) return -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) /* Initialize the extra goodies GEM needs to do all the hard work */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (drm_gem_object_init(dev, &r->gem, size) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) psb_gtt_free_range(dev, r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /* GEM doesn't give an error code so use -ENOMEM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) dev_err(dev->dev, "GEM init failed for %lld\n", size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) /* Limit the object to 32bit mappings */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) mapping_set_gfp_mask(r->gem.filp->f_mapping, GFP_KERNEL | __GFP_DMA32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /* Give the object a handle so we can carry it more easily */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) ret = drm_gem_handle_create(file, &r->gem, &handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) dev_err(dev->dev, "GEM handle failed for %p, %lld\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) &r->gem, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) drm_gem_object_release(&r->gem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) psb_gtt_free_range(dev, r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) /* We have the initial and handle reference but need only one now */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) drm_gem_object_put(&r->gem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) *handlep = handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * psb_gem_dumb_create - create a dumb buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * @drm_file: our client file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * @dev: our device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * @args: the requested arguments copied from userspace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * Allocate a buffer suitable for use for a frame buffer of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * form described by user space. Give userspace a handle by which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * to reference it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) int psb_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) struct drm_mode_create_dumb *args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) args->size = args->pitch * args->height;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return psb_gem_create(file, dev, args->size, &args->handle, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * psb_gem_fault - pagefault handler for GEM objects
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) * @vma: the VMA of the GEM object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * @vmf: fault detail
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * Invoked when a fault occurs on an mmap of a GEM managed area. GEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) * does most of the work for us including the actual map/unmap calls
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * but we need to do the actual page work.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * This code eventually needs to handle faulting objects in and out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * of the GTT and repacking it when we run out of space. We can put
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * that off for now and for our simple uses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * The VMA was set up by GEM. In doing so it also ensured that the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * vma->vm_private_data points to the GEM object that is backing this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * mapping.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) vm_fault_t psb_gem_fault(struct vm_fault *vmf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) struct vm_area_struct *vma = vmf->vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) struct drm_gem_object *obj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct gtt_range *r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) vm_fault_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) unsigned long pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) pgoff_t page_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) struct drm_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) struct drm_psb_private *dev_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) obj = vma->vm_private_data; /* GEM object */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) dev = obj->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) dev_priv = dev->dev_private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) r = container_of(obj, struct gtt_range, gem); /* Get the gtt range */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) /* Make sure we don't parallel update on a fault, nor move or remove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) something from beneath our feet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) mutex_lock(&dev_priv->mmap_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) /* For now the mmap pins the object and it stays pinned. As things
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) stand that will do us no harm */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (r->mmapping == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) err = psb_gtt_pin(r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) dev_err(dev->dev, "gma500: pin failed: %d\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) ret = vmf_error(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) r->mmapping = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) /* Page relative to the VMA start - we must calculate this ourselves
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) because vmf->pgoff is the fake GEM offset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) /* CPU view of the page, don't go via the GART for CPU writes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if (r->stolen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) pfn = (dev_priv->stolen_base + r->offset) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) pfn = page_to_pfn(r->pages[page_offset]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) ret = vmf_insert_pfn(vma, vmf->address, pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) mutex_unlock(&dev_priv->mmap_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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