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drm/imagination: Add GEM and VM related code

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Add a GEM implementation based on drm_gem_shmem, and support code for the
PowerVR GPU MMU. The GPU VA manager is used for address space management.

Changes since v8:
- Updated for changes to drm_gpuvm
- Switched to dma_resv locking for vm ops
- Removed linked lists for collecting BOs in vm_context and for freeing
  after ops. This is now done internally in drm_gpuvm
- Corrected license identifiers

Changes since v7:
- kernel-doc fixes
- Remove prefixes from DRM_PVR_BO_* flags
- CREATE_BO ioctl now returns an error if provided size isn't page aligned
- Optimised MMU flushes

Changes since v6:
- Don't initialise kernel_vm_ctx when using MIPS firmware processor
- Rename drm_gpuva_manager uses to drm_gpuvm
- Sync GEM object to device on creation

Changes since v5:
- Use WRITE_ONCE() when writing to page tables
- Add memory barriers to page table insertion
- Fixed double backing page alloc on page table objects
- Fix BO mask checks in DRM_IOCTL_PVR_CREATE_BO handler
- Document use of pvr_page_table_*_idx when preallocing page table objs
- Remove pvr_vm_gpuva_mapping_init()
- Remove NULL check for unmap op in remap function
- Protect gem object with mutex during drm_gpuva_link/unlink
- Defer free or release of page table pages until after TLB flush
- Use drm_gpuva_op_remap_get_unmap_range() helper

Changes since v4:
- Correct sync function in vmap/vunmap function documentation
- Update for upstream GPU VA manager
- Fix missing frees when unmapping drm_gpuva objects
- Always zero GEM BOs on creation

Changes since v3:
- Split MMU and VM code
- Register page table allocations with kmemleak
- Use drm_dev_{enter,exit}

Changes since v2:
- Use GPU VA manager
- Use drm_gem_shmem

Co-developed-by: Matt Coster <matt.coster@imgtec.com>
Signed-off-by: Matt Coster <matt.coster@imgtec.com>
Co-developed-by: Donald Robson <donald.robson@imgtec.com>
Signed-off-by: Donald Robson <donald.robson@imgtec.com>
Signed-off-by: Sarah Walker <sarah.walker@imgtec.com>
Link: https://lore.kernel.org/r/3c96dd170efe759b73897e3675d7310a7c4b06d0.1700668843.git.donald.robson@imgtec.com
Signed-off-by: Maxime Ripard <mripard@kernel.org>
This commit is contained in:
Donald Robson
2023-11-22 16:34:32 +00:00
committed by Maxime Ripard
parent f99f5f3ea7
commit ff5f643de0
11 changed files with 4756 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/gpu/drm/imagination/pvr_device.c
View File

@@ -6,6 +6,7 @@
#include "pvr_fw.h"
#include "pvr_rogue_cr_defs.h"
#include "pvr_vm.h"
#include <drm/drm_print.h>
@@ -312,7 +313,30 @@ pvr_device_gpu_init(struct pvr_device *pvr_dev)
else
return -EINVAL;
return pvr_set_dma_info(pvr_dev);
err = pvr_set_dma_info(pvr_dev);
if (err)
return err;
if (pvr_dev->fw_dev.processor_type != PVR_FW_PROCESSOR_TYPE_MIPS) {
pvr_dev->kernel_vm_ctx = pvr_vm_create_context(pvr_dev, false);
if (IS_ERR(pvr_dev->kernel_vm_ctx))
return PTR_ERR(pvr_dev->kernel_vm_ctx);
}
return 0;
}
/**
* pvr_device_gpu_fini() - GPU-specific deinitialization for a PowerVR device
* @pvr_dev: Target PowerVR device.
*/
static void
pvr_device_gpu_fini(struct pvr_device *pvr_dev)
{
if (pvr_dev->fw_dev.processor_type != PVR_FW_PROCESSOR_TYPE_MIPS) {
WARN_ON(!pvr_vm_context_put(pvr_dev->kernel_vm_ctx));
pvr_dev->kernel_vm_ctx = NULL;
}
}
/**
@@ -364,6 +388,7 @@ pvr_device_fini(struct pvr_device *pvr_dev)
* Deinitialization stages are performed in reverse order compared to
* the initialization stages in pvr_device_init().
*/
pvr_device_gpu_fini(pvr_dev);
}
bool