diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/modules/vmid/vmid.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/modules/vmid/vmid.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/modules/vmid/vmid.c b/drivers/gpu/drm/amd/display/modules/vmid/vmid.c new file mode 100644 index 000000000000..f0a153704f6e --- /dev/null +++ b/drivers/gpu/drm/amd/display/modules/vmid/vmid.c @@ -0,0 +1,167 @@ +/* + * Copyright 2019 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: AMD + * + */ + +#include "mod_vmid.h" + +struct core_vmid { + struct mod_vmid public; + struct dc *dc; + + unsigned int num_vmid; + unsigned int num_vmids_available; + uint64_t ptb_assigned_to_vmid[MAX_VMID]; + struct dc_virtual_addr_space_config base_config; +}; + +#define MOD_VMID_TO_CORE(mod_vmid)\ + container_of(mod_vmid, struct core_vmid, public) + +static void add_ptb_to_table(struct core_vmid *core_vmid, unsigned int vmid, uint64_t ptb) +{ + core_vmid->ptb_assigned_to_vmid[vmid] = ptb; + core_vmid->num_vmids_available--; +} + +static void clear_entry_from_vmid_table(struct core_vmid *core_vmid, unsigned int vmid) +{ + core_vmid->ptb_assigned_to_vmid[vmid] = 0; + core_vmid->num_vmids_available++; +} + +static void evict_vmids(struct core_vmid *core_vmid) +{ + int i; + uint16_t ord = dc_get_vmid_use_vector(core_vmid->dc); + + // At this point any positions with value 0 are unused vmids, evict them + for (i = 1; i < core_vmid->num_vmid; i++) { + if (ord & (1u << i)) + clear_entry_from_vmid_table(core_vmid, i); + } +} + +// Return value of -1 indicates vmid table unitialized or ptb dne in the table +static int get_existing_vmid_for_ptb(struct core_vmid *core_vmid, uint64_t ptb) +{ + int i; + + for (i = 0; i < core_vmid->num_vmid; i++) { + if (core_vmid->ptb_assigned_to_vmid[i] == ptb) + return i; + } + + return -1; +} + +// Expected to be called only when there's an available vmid +static int get_next_available_vmid(struct core_vmid *core_vmid) +{ + int i; + + for (i = 1; i < core_vmid->num_vmid; i++) { + if (core_vmid->ptb_assigned_to_vmid[i] == 0) + return i; + } + + return -1; +} + +uint8_t mod_vmid_get_for_ptb(struct mod_vmid *mod_vmid, uint64_t ptb) +{ + struct core_vmid *core_vmid = MOD_VMID_TO_CORE(mod_vmid); + unsigned int vmid = 0; + + // Physical address gets vmid 0 + if (ptb == 0) + return 0; + + vmid = get_existing_vmid_for_ptb(core_vmid, ptb); + + if (vmid == -1) { + struct dc_virtual_addr_space_config va_config = core_vmid->base_config; + + va_config.page_table_base_addr = ptb; + + if (core_vmid->num_vmids_available == 0) + evict_vmids(core_vmid); + + vmid = get_next_available_vmid(core_vmid); + add_ptb_to_table(core_vmid, vmid, ptb); + + dc_setup_vm_context(core_vmid->dc, &va_config, vmid); + } + + return vmid; +} + +void mod_vmid_reset(struct mod_vmid *mod_vmid) +{ + struct core_vmid *core_vmid = MOD_VMID_TO_CORE(mod_vmid); + + core_vmid->num_vmids_available = core_vmid->num_vmid - 1; + memset(core_vmid->ptb_assigned_to_vmid, 0, sizeof(core_vmid->ptb_assigned_to_vmid[0]) * MAX_VMID); +} + +struct mod_vmid *mod_vmid_create( + struct dc *dc, + unsigned int num_vmid, + struct dc_virtual_addr_space_config *va_config) +{ + struct core_vmid *core_vmid; + + if (num_vmid <= 1) + goto fail_no_vm_ctx; + + if (dc == NULL) + goto fail_dc_null; + + core_vmid = kzalloc(sizeof(struct core_vmid), GFP_KERNEL); + + if (core_vmid == NULL) + goto fail_alloc_context; + + core_vmid->dc = dc; + core_vmid->num_vmid = num_vmid; + core_vmid->num_vmids_available = num_vmid - 1; + core_vmid->base_config = *va_config; + + memset(core_vmid->ptb_assigned_to_vmid, 0, sizeof(core_vmid->ptb_assigned_to_vmid[0]) * MAX_VMID); + + return &core_vmid->public; + +fail_no_vm_ctx: +fail_alloc_context: +fail_dc_null: + return NULL; +} + +void mod_vmid_destroy(struct mod_vmid *mod_vmid) +{ + if (mod_vmid != NULL) { + struct core_vmid *core_vmid = MOD_VMID_TO_CORE(mod_vmid); + + kfree(core_vmid); + } +} |