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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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H A Dcommon.h352 /* shmem related declarations */
359 * @tx_prepare: Prepare the @xfer message for transmission on the chosen @shmem
360 * @read_header: Read header of the message currently hold in @shmem
361 * @fetch_response: Copy the message response from @shmem into @xfer
362 * @fetch_notification: Copy the message notification from @shmem into @xfer
363 * @clear_channel: Clear the @shmem channel busy flag
364 * @poll_done: Check if poll has completed for @xfer on @shmem
365 * @channel_free: Check if @shmem channel is marked as free
366 * @channel_intr_enabled: Check is @shmem channel has requested a completion irq
370 void (*tx_prepare)(struct scmi_shared_mem __iomem *shmem,
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/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/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/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
42 shmem@f1be0000 {
43 compatible = "nvidia,tegra264-bpmp-shmem";
/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/drivers/platform/x86/amd/hfi/
H A Dhfi.c76 struct amd_shmem_info *shmem; member
157 memcpy_fromio(amd_hfi_data->shmem, pcc_comm_addr, pcct_ext->length); in amd_hfi_fill_metadata()
160 if (amd_hfi_data->shmem->header.signature != PCC_SIGNATURE) { in amd_hfi_fill_metadata()
164 if (amd_hfi_data->shmem->version_number != AMD_HETERO_RANKING_TABLE_VER) { in amd_hfi_fill_metadata()
166 amd_hfi_data->shmem->version_number); in amd_hfi_fill_metadata()
170 for (unsigned int i = 0; i < amd_hfi_data->shmem->n_bitmaps; i++) { in amd_hfi_fill_metadata()
171 u32 bitmap = amd_hfi_data->shmem->table_data[i]; in amd_hfi_fill_metadata()
194 u32 *table = amd_hfi_data->shmem->table_data + in amd_hfi_fill_metadata()
195 amd_hfi_data->shmem->n_bitmaps + in amd_hfi_fill_metadata()
393 amd_hfi_data->shmem = devm_kzalloc(amd_hfi_data->dev, pcct_ext->length, GFP_KERNEL); in amd_hfi_metadata_parser()
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/linux/Documentation/admin-guide/mm/
H A Dtranshuge.rst15 Currently THP only works for anonymous memory mappings and tmpfs/shmem.
373 allocation policy for the internal shmem mount by using the kernel parameter
375 seven valid policies for shmem (``always``, ``within_size``, ``advise``,
385 size, ``thp_shmem`` controls each supported shmem THP size. ``thp_shmem``
390 as required. If ``thp_shmem=`` is specified at least once, any shmem THP
401 Hugepages in tmpfs/shmem
410 shmem mount (see below), ordinary tmpfs mounts will make use of all available
459 shmem / internal tmpfs
553 is incremented every time a shmem huge page is successfully
555 measures only shmem).
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/linux/Documentation/devicetree/bindings/firmware/
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 Dgoogle,gs101-acpm-ipc.yaml39 shmem:
49 - shmem
60 shmem = <&apm_sram>;
H A Dnvidia,tegra186-bpmp.yaml63 See "../reserved-memory/nvidia,tegra264-bpmp-shmem.yaml" for bindings for
82 shmem:
131 - shmem
183 shmem = <&cpu_bpmp_tx>, <&cpu_bpmp_rx>;
/linux/drivers/firmware/samsung/
H A Dexynos-acpm.c160 * @shmem: pointer to the SRAM configuration data.
168 struct acpm_shmem __iomem *shmem; member
546 struct acpm_shmem __iomem *shmem = acpm->shmem; in acpm_channels_init() local
551 acpm->num_chans = readl(&shmem->num_chans); in acpm_channels_init()
557 chans_shmem = acpm->sram_base + readl(&shmem->chans); in acpm_channels_init()
606 struct device_node *shmem; in acpm_probe() local
616 shmem = of_parse_phandle(dev->of_node, "shmem", 0); in acpm_probe()
617 ret = of_address_to_resource(shmem, 0, &res); in acpm_probe()
618 of_node_put(shmem); in acpm_probe()
634 acpm->shmem = acpm->sram_base + match_data->initdata_base; in acpm_probe()
/linux/mm/
H A Dmincore.c50 static unsigned char mincore_swap(swp_entry_t entry, bool shmem) in mincore_swap() argument
62 * Shmem mapping may contain swapin error entries, which are in mincore_swap()
67 return !shmem; in mincore_swap()
70 * Shmem mapping lookup is lockless, so we need to grab the swap in mincore_swap()
74 if (shmem) { in mincore_swap()
80 if (shmem) in mincore_swap()
/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/mailbox/
H A Dpcc.c298 pcc_hdr = pchan->chan.shmem; in pcc_chan_acknowledge()
315 memcpy_fromio(&pcc_header, pchan->chan.shmem, in write_response()
321 memcpy_fromio(buffer, pchan->chan.shmem, data_len); in write_response()
413 pcc_mchan->shmem = acpi_os_ioremap(pcc_mchan->shmem_base_addr, in pcc_mbox_request_channel()
415 if (!pcc_mchan->shmem) in pcc_mbox_request_channel()
454 if (pcc_mbox_chan->shmem) { in pcc_mbox_free_channel()
455 iounmap(pcc_mbox_chan->shmem); in pcc_mbox_free_channel()
456 pcc_mbox_chan->shmem = NULL; in pcc_mbox_free_channel()
483 memcpy_toio(pcc_mbox_chan->shmem, data, len); in pcc_write_to_buffer()
/linux/drivers/devfreq/
H A Dhisi_uncore_freq.c191 struct hisi_uncore_pcc_shmem shmem; in hisi_uncore_cmd_send() local
204 addr = (struct hisi_uncore_pcc_shmem __iomem *)pchan->shmem; in hisi_uncore_cmd_send()
215 shmem.head = (struct acpi_pcct_shared_memory) { in hisi_uncore_cmd_send()
219 shmem.pcc_data.data = *data; in hisi_uncore_cmd_send()
220 memcpy_toio(addr, &shmem, sizeof(shmem)); in hisi_uncore_cmd_send()
/linux/arch/arm64/boot/dts/blaize/
H A Dblaize-blzp1600.dtsi50 shmem = <&scmi0_shm>;
82 scmi0_shm: scmi-shmem@800 {
83 compatible = "arm,scmi-shmem";
/linux/drivers/firmware/tegra/
H A Dbpmp-tegra186.c236 priv->tx.pool = of_gen_pool_get(bpmp->dev->of_node, "shmem", 0); in tegra186_bpmp_sram_init()
238 dev_err(bpmp->dev, "TX shmem pool not found\n"); in tegra186_bpmp_sram_init()
249 priv->rx.pool = of_gen_pool_get(bpmp->dev->of_node, "shmem", 1); in tegra186_bpmp_sram_init()
251 dev_err(bpmp->dev, "RX shmem pool not found\n"); in tegra186_bpmp_sram_init()
/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 folio into the buffer cache. */
/linux/drivers/accel/ivpu/
H A Divpu_gem.c225 struct drm_gem_shmem_object *shmem; in ivpu_bo_alloc() local
236 shmem = drm_gem_shmem_create(&vdev->drm, size); in ivpu_bo_alloc()
237 if (IS_ERR(shmem)) in ivpu_bo_alloc()
238 return ERR_CAST(shmem); in ivpu_bo_alloc()
240 bo = to_ivpu_bo(&shmem->base); in ivpu_bo_alloc()

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