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/linux/drivers/gpu/drm/
H A Ddrm_gem_shmem_helper.c30 * This library provides helpers for GEM objects backed by shmem buffers
55 struct drm_gem_shmem_object *shmem; in __drm_gem_shmem_create() local
65 shmem = to_drm_gem_shmem_obj(obj); in __drm_gem_shmem_create()
67 shmem = kzalloc(sizeof(*shmem), GFP_KERNEL); in __drm_gem_shmem_create()
68 if (!shmem) in __drm_gem_shmem_create()
70 obj = &shmem->base; in __drm_gem_shmem_create()
78 shmem->map_wc = false; /* dma-buf mappings use always writecombine */ in __drm_gem_shmem_create()
91 INIT_LIST_HEAD(&shmem->madv_list); in __drm_gem_shmem_create()
105 return shmem; in __drm_gem_shmem_create()
119 * This function creates a shmem GEM object.
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/linux/drivers/gpu/drm/tests/
H A Ddrm_gem_shmem_test.c3 * KUnit test suite for GEM objects backed by shmem buffers
38 * Test creating a shmem GEM object backed by shmem buffer. The test
40 * shmem file node and object functions attributes set, and the size
46 struct drm_gem_shmem_object *shmem; in drm_gem_shmem_test_obj_create() local
48 shmem = drm_gem_shmem_create(drm_dev, TEST_SIZE); in drm_gem_shmem_test_obj_create()
49 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem); in drm_gem_shmem_test_obj_create()
50 KUNIT_EXPECT_EQ(test, shmem->base.size, TEST_SIZE); in drm_gem_shmem_test_obj_create()
51 KUNIT_EXPECT_NOT_NULL(test, shmem->base.filp); in drm_gem_shmem_test_obj_create()
52 KUNIT_EXPECT_NOT_NULL(test, shmem->base.funcs); in drm_gem_shmem_test_obj_create()
54 drm_gem_shmem_free(shmem); in drm_gem_shmem_test_obj_create()
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/linux/drivers/firmware/arm_scmi/
H A Dshmem.c88 static void shmem_tx_prepare(struct scmi_shared_mem __iomem *shmem, in shmem_tx_prepare() argument
110 spin_until_cond((ioread32(&shmem->channel_status) & in shmem_tx_prepare()
113 if (!(ioread32(&shmem->channel_status) & in shmem_tx_prepare()
122 iowrite32(0x0, &shmem->channel_status); in shmem_tx_prepare()
124 &shmem->flags); in shmem_tx_prepare()
125 iowrite32(sizeof(shmem->msg_header) + xfer->tx.len, &shmem->length); in shmem_tx_prepare()
126 iowrite32(pack_scmi_header(&xfer->hdr), &shmem->msg_header); in shmem_tx_prepare()
128 copy_toio(shmem->msg_payload, xfer->tx.buf, xfer->tx.len); in shmem_tx_prepare()
131 static u32 shmem_read_header(struct scmi_shared_mem __iomem *shmem) in shmem_read_header() argument
133 return ioread32(&shmem->msg_header); in shmem_read_header()
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/linux/arch/riscv/kvm/
H A Dvcpu_sbi_sta.c21 vcpu->arch.sta.shmem = INVALID_GPA; in kvm_riscv_vcpu_sbi_sta_reset()
27 gpa_t shmem = vcpu->arch.sta.shmem; in kvm_riscv_vcpu_record_steal_time() local
38 if (shmem == INVALID_GPA) in kvm_riscv_vcpu_record_steal_time()
42 * shmem is 64-byte aligned (see the enforcement in in kvm_riscv_vcpu_record_steal_time()
46 gfn = shmem >> PAGE_SHIFT; in kvm_riscv_vcpu_record_steal_time()
50 vcpu->arch.sta.shmem = INVALID_GPA; in kvm_riscv_vcpu_record_steal_time()
54 sequence_ptr = (__le32 __user *)(hva + offset_in_page(shmem) + in kvm_riscv_vcpu_record_steal_time()
56 steal_ptr = (__le64 __user *)(hva + offset_in_page(shmem) + in kvm_riscv_vcpu_record_steal_time()
90 gpa_t shmem; in kvm_sbi_sta_steal_time_set_shmem() local
98 vcpu->arch.sta.shmem = INVALID_GPA; in kvm_sbi_sta_steal_time_set_shmem()
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/linux/drivers/gpu/drm/panfrost/
H A Dpanfrost_gem_shrinker.c22 struct drm_gem_shmem_object *shmem; in panfrost_gem_shrinker_count() local
28 list_for_each_entry(shmem, &pfdev->shrinker_list, madv_list) { in panfrost_gem_shrinker_count()
29 if (drm_gem_shmem_is_purgeable(shmem)) in panfrost_gem_shrinker_count()
30 count += shmem->base.size >> PAGE_SHIFT; in panfrost_gem_shrinker_count()
40 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); in panfrost_gem_purge() local
50 if (!dma_resv_trylock(shmem->base.resv)) in panfrost_gem_purge()
57 dma_resv_unlock(shmem->base.resv); in panfrost_gem_purge()
68 struct drm_gem_shmem_object *shmem, *tmp; in panfrost_gem_shrinker_scan() local
74 list_for_each_entry_safe(shmem, tmp, &pfdev->shrinker_list, madv_list) { in panfrost_gem_shrinker_scan()
77 if (drm_gem_shmem_is_purgeable(shmem) && in panfrost_gem_shrinker_scan()
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/linux/Documentation/devicetree/bindings/firmware/
H A Darm,scmi.yaml41 with shmem address(4KB-page, offset) as parameters
94 The effective combination in numbers of mboxes and shmem descriptors let
97 1 mbox / 1 shmem => SCMI TX over 1 mailbox bidirectional channel
98 2 mbox / 2 shmem => SCMI TX and RX over 2 mailbox bidirectional channels
99 2 mbox / 1 shmem => SCMI TX over 2 mailbox unidirectional channels
100 3 mbox / 2 shmem => SCMI TX and RX over 3 mailbox unidirectional channels
101 4 mbox / 2 shmem => SCMI TX and RX over 4 mailbox unidirectional channels
102 Any other combination of mboxes and shmem is invalid.
106 shmem:
351 shmem:
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H A Darm,scpi.yaml48 shmem:
170 - shmem
178 shmem = <&cpu_scp_hpri>; /* HP-NonSecure */
225 compatible = "arm,scp-shmem";
230 compatible = "arm,scp-shmem";
241 shmem = <&cpu_scp_lpri>, <&cpu_scp_hpri>;
H A Dnvidia,tegra186-bpmp.yaml63 See "../reserved-memory/nvidia,tegra264-bpmp-shmem.yaml" for bindings for
81 shmem:
130 - shmem
182 shmem = <&cpu_bpmp_tx>, <&cpu_bpmp_rx>;
/linux/drivers/net/arcnet/
H A Dcom90xx.c44 * shmem are left in the list at Stage 5, they must correspond to each
58 static int com90xx_found(int ioaddr, int airq, u_long shmem, void __iomem *);
86 static int io; /* use the insmod io= irq= shmem= options */
88 static int shmem; variable
93 module_param(shmem, int, 0);
107 if (!io && !irq && !shmem && !*device && com90xx_skip_probe) in com90xx_probe()
131 if (shmem) in com90xx_probe()
132 shmems[numshmems++] = shmem; in com90xx_probe()
203 /* Stage 3: abandon any shmem addresses that don't have the signature in com90xx_probe()
243 * sure no "mirror" shmem areas show up - if they occur in com90xx_probe()
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H A Darc-rimi.c65 * need to be passed a specific shmem address, IRQ, and node ID.
72 pr_info("Given: node %02Xh, shmem %lXh, irq %d\n", in arcrimi_probe()
78 pr_err("No autoprobe for RIM I; you must specify the shmem and irq!\n"); in arcrimi_probe()
126 unsigned long first_mirror, last_mirror, shmem; in arcrimi_found() local
146 shmem = dev->mem_start; in arcrimi_found()
159 check_mirror(shmem - MIRROR_SIZE, MIRROR_SIZE) == 0 && in arcrimi_found()
160 check_mirror(shmem - 2 * MIRROR_SIZE, MIRROR_SIZE) == 1) in arcrimi_found()
163 first_mirror = shmem - mirror_size; in arcrimi_found()
168 last_mirror = shmem + mirror_size; in arcrimi_found()
194 release_mem_region(shmem, MIRROR_SIZE); in arcrimi_found()
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/linux/drivers/net/ethernet/microsoft/mana/
H A Dshm_channel.c82 /* shmem reads as 0xFFFFFFFF in the reset case */ in mana_smc_poll_register()
146 u64 *shmem; in mana_smc_setup_hwc() local
186 shmem = (u64 *)ptr; in mana_smc_setup_hwc()
188 *shmem = frame_addr & PAGE_FRAME_L48_MASK; in mana_smc_setup_hwc()
194 shmem = (u64 *)ptr; in mana_smc_setup_hwc()
196 *shmem = frame_addr & PAGE_FRAME_L48_MASK; in mana_smc_setup_hwc()
202 shmem = (u64 *)ptr; in mana_smc_setup_hwc()
204 *shmem = frame_addr & PAGE_FRAME_L48_MASK; in mana_smc_setup_hwc()
210 shmem = (u64 *)ptr; in mana_smc_setup_hwc()
212 *shmem = frame_addr & PAGE_FRAME_L48_MASK; in mana_smc_setup_hwc()
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/linux/drivers/accel/amdxdna/
H A Damdxdna_gem.c267 struct drm_gem_shmem_object *shmem; in amdxdna_drm_alloc_shmem() local
270 shmem = drm_gem_shmem_create(dev, args->size); in amdxdna_drm_alloc_shmem()
271 if (IS_ERR(shmem)) in amdxdna_drm_alloc_shmem()
272 return ERR_CAST(shmem); in amdxdna_drm_alloc_shmem()
274 shmem->map_wc = false; in amdxdna_drm_alloc_shmem()
276 abo = to_xdna_obj(&shmem->base); in amdxdna_drm_alloc_shmem()
290 struct drm_gem_shmem_object *shmem; in amdxdna_drm_create_dev_heap() local
307 shmem = drm_gem_shmem_create(dev, args->size); in amdxdna_drm_create_dev_heap()
308 if (IS_ERR(shmem)) { in amdxdna_drm_create_dev_heap()
309 ret = PTR_ERR(shmem); in amdxdna_drm_create_dev_heap()
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/linux/Documentation/devicetree/bindings/reserved-memory/
H A Dnvidia,tegra264-bpmp-shmem.yaml4 $id: http://devicetree.org/schemas/reserved-memory/nvidia,tegra264-bpmp-shmem.yaml#
17 The sub-node is named shmem@<address>.
24 const: nvidia,tegra264-bpmp-shmem
41 dram_cpu_bpmp_mail: shmem@f1be0000 {
42 compatible = "nvidia,tegra264-bpmp-shmem";
/linux/Documentation/devicetree/bindings/mailbox/
H A Dmailbox.txt26 - shmem : List of phandle pointing to the shared memory(SHM) area between the
39 Example with shared memory(shmem):
49 cl_shmem: shmem@0 {
50 compatible = "client-shmem";
58 shmem = <&cl_shmem>;
H A Darm,mhu.yaml111 shmem = <&cpu_scp_hpri>; /* HP-NonSecure */
145 shmem = <&cpu_scp_lpri0>,
163 shmem = <&cpu_scp_hpri0>,
/linux/drivers/firmware/arm_scmi/transports/
H A Doptee.c88 * When set, OP-TEE supports command using SMT header protocol (SCMI shmem) in
112 * @req.shmem: Virtual base address of the shared memory
116 * @tee_shm: TEE shared memory handle @req or NULL if using IOMEM shmem
127 struct scmi_shared_mem __iomem *shmem; member
328 core->shmem->clear_channel(channel->req.shmem); in scmi_optee_clear_channel()
338 dev_err(channel->cinfo->dev, "shmem allocation failed\n"); in setup_dynamic_shmem()
353 channel->req.shmem = core->shmem->setup_iomap(cinfo, dev, true, NULL, in setup_static_shmem()
355 if (IS_ERR(channel->req.shmem)) in setup_static_shmem()
356 return PTR_ERR(channel->req.shmem); in setup_static_shmem()
364 if (of_property_present(cinfo->dev->of_node, "shmem")) in setup_shmem()
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/linux/Documentation/admin-guide/cgroup-v1/
H A Dmemcg_test.rst108 6. Shmem(tmpfs) Page Cache
111 The best way to understand shmem's page state transition is to read
112 mm/shmem.c.
114 But brief explanation of the behavior of memcg around shmem will be
117 Shmem's page (just leaf page, not direct/indirect block) can be on
119 - radix-tree of shmem's inode.
126 - A new page is added to shmem's radix-tree.
155 9.2 Shmem
158 Historically, memcg's shmem handling was poor and we saw some amount
159 of troubles here. This is because shmem is page-cache but can be
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/linux/arch/arm64/boot/dts/arm/
H A Djuno-scmi.dtsi49 shmem = <&cpu_scp_lpri0 &cpu_scp_lpri1>;
63 shmem = <&cpu_scp_hpri0 &cpu_scp_hpri1>;
205 compatible = "arm,scmi-shmem";
210 compatible = "arm,scmi-shmem";
215 compatible = "arm,scmi-shmem";
220 compatible = "arm,scmi-shmem";
/linux/Documentation/admin-guide/mm/
H A Dtranshuge.rst15 Currently THP only works for anonymous memory mappings and tmpfs/shmem.
330 allocation policy for the internal shmem mount by using the kernel parameter
332 seven valid policies for shmem (``always``, ``within_size``, ``advise``,
342 size, ``thp_shmem`` controls each supported shmem THP size. ``thp_shmem``
347 as required. If ``thp_shmem=`` is specified at least once, any shmem THP
358 Hugepages in tmpfs/shmem
367 shmem mount (see below), ordinary tmpfs mounts will make use of all available
410 shmem / internal tmpfs
502 is incremented every time a shmem huge page is successfully
504 measures only shmem).
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/linux/tools/testing/selftests/cachestat/
H A Dtest_cachestat.c219 ksft_print_msg("Unable to create shmem file.\n"); in test_cachestat_shmem()
225 ksft_print_msg("Unable to truncate shmem file.\n"); in test_cachestat_shmem()
231 ksft_print_msg("Unable to write to shmem file.\n"); in test_cachestat_shmem()
312 ksft_test_result_pass("cachestat works with a shmem file\n"); in main()
314 ksft_test_result_fail("cachestat fails with a shmem file\n"); in main()
/linux/drivers/gpu/drm/virtio/
H A Dvirtgpu_object.c147 struct virtio_gpu_object_shmem *shmem; in virtio_gpu_create_object() local
150 shmem = kzalloc(sizeof(*shmem), GFP_KERNEL); in virtio_gpu_create_object()
151 if (!shmem) in virtio_gpu_create_object()
154 dshmem = &shmem->base.base; in virtio_gpu_create_object()
/linux/fs/xfs/
H A Dxfs_buf_mem.c26 * requirements. Therefore, the xmbuf mechanism uses an unlinked shmem file to
39 * shmem files used to back an in-memory buffer cache must not be exposed to
130 /* Directly map a shmem page into the buffer cache. */
178 /* Unmap a shmem page that was mapped into the buffer cache. */
/linux/include/uapi/linux/
H A Duserfaultfd.h196 * UFFD_FEATURE_MISSING_HUGETLBFS, but it applies to shmem
197 * (i.e. tmpfs and other shmem based APIs).
211 * UFFD_FEATURE_MINOR_HUGETLBFS, but for shmem-backed pages instead.
218 * write-protection mode is supported on both shmem and hugetlbfs.
222 * (i.e. empty ptes). This will be the default behavior for shmem
/linux/drivers/accel/ivpu/
H A Divpu_gem.c177 struct drm_gem_shmem_object *shmem; in ivpu_bo_alloc() local
188 shmem = drm_gem_shmem_create(&vdev->drm, size); in ivpu_bo_alloc()
189 if (IS_ERR(shmem)) in ivpu_bo_alloc()
190 return ERR_CAST(shmem); in ivpu_bo_alloc()
192 bo = to_ivpu_bo(&shmem->base); in ivpu_bo_alloc()
/linux/tools/testing/selftests/mm/
H A Duffd-stress.c60 "./uffd-stress shmem 1000 99\n\n"
73 "hugetlb-private, shmem, shmem-private\n\n"); in usage()
381 } else if (!strcmp(type, "shmem")) { in set_test_type()
385 } else if (!strcmp(type, "shmem-private")) { in set_test_type()

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