cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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nouveau_sgdma.c (1965B)

      1// SPDX-License-Identifier: MIT
      2#include <linux/pagemap.h>
      3#include <linux/slab.h>
      4
      5#include "nouveau_drv.h"
      6#include "nouveau_mem.h"
      7#include "nouveau_ttm.h"
      8#include "nouveau_bo.h"
      9
     10struct nouveau_sgdma_be {
     11	/* this has to be the first field so populate/unpopulated in
     12	 * nouve_bo.c works properly, otherwise have to move them here
     13	 */
     14	struct ttm_tt ttm;
     15	struct nouveau_mem *mem;
     16};
     17
     18void
     19nouveau_sgdma_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
     20{
     21	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
     22
     23	if (ttm) {
     24		ttm_tt_fini(&nvbe->ttm);
     25		kfree(nvbe);
     26	}
     27}
     28
     29int
     30nouveau_sgdma_bind(struct ttm_device *bdev, struct ttm_tt *ttm, struct ttm_resource *reg)
     31{
     32	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
     33	struct nouveau_drm *drm = nouveau_bdev(bdev);
     34	struct nouveau_mem *mem = nouveau_mem(reg);
     35	int ret;
     36
     37	if (nvbe->mem)
     38		return 0;
     39
     40	ret = nouveau_mem_host(reg, &nvbe->ttm);
     41	if (ret)
     42		return ret;
     43
     44	if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA) {
     45		ret = nouveau_mem_map(mem, &mem->cli->vmm.vmm, &mem->vma[0]);
     46		if (ret) {
     47			nouveau_mem_fini(mem);
     48			return ret;
     49		}
     50	}
     51
     52	nvbe->mem = mem;
     53	return 0;
     54}
     55
     56void
     57nouveau_sgdma_unbind(struct ttm_device *bdev, struct ttm_tt *ttm)
     58{
     59	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
     60	if (nvbe->mem) {
     61		nouveau_mem_fini(nvbe->mem);
     62		nvbe->mem = NULL;
     63	}
     64}
     65
     66struct ttm_tt *
     67nouveau_sgdma_create_ttm(struct ttm_buffer_object *bo, uint32_t page_flags)
     68{
     69	struct nouveau_drm *drm = nouveau_bdev(bo->bdev);
     70	struct nouveau_bo *nvbo = nouveau_bo(bo);
     71	struct nouveau_sgdma_be *nvbe;
     72	enum ttm_caching caching;
     73
     74	if (nvbo->force_coherent)
     75		caching = ttm_uncached;
     76	else if (drm->agp.bridge)
     77		caching = ttm_write_combined;
     78	else
     79		caching = ttm_cached;
     80
     81	nvbe = kzalloc(sizeof(*nvbe), GFP_KERNEL);
     82	if (!nvbe)
     83		return NULL;
     84
     85	if (ttm_sg_tt_init(&nvbe->ttm, bo, page_flags, caching)) {
     86		kfree(nvbe);
     87		return NULL;
     88	}
     89	return &nvbe->ttm;
     90}