iommu/riscv: Add HPM support for RISC-V IOMMU

This patchset adds HPM support for RISC-V IOMMU. The HPM support can be found in recent announced SpacemiT SoCs (K3), where T100 (SpacemiT distributed IOMMU) is shipped.

The tested result can be found as follows:

 root@sdfirm:~# perf stat --timeout 5000 -a -e riscv_iommu_hpm_0/device-directory-walks,config1=0x20c0010000000000/ dmatest; sleep 1
 [  176.025295] event_source riscv_iommu_hpm_0: Setting event filter: 20c0010000000005, PID PSCID: 0x0, DID GSCID: 0xc0010, PV PSCV: 0x0, DV GSCV: 0x1, IDT: 0x0, DMASK: 0x0, Index: 0
 [  176.110211] dmatest: Started 1 threads using dma0chan0
 [  176.114933] dmatest: dma0chan0-copy0: summary 1 tests, 0 failures 394.94 iops 394 KB/s (0)

Performance counter stats for 'system wide':

                  3      riscv_iommu_hpm_0/device-directory-walks,config1=0x20c0010000000000/                                   
 
        0.081056000 seconds time elapsed

 root@sdfirm:~# perf stat --timeout 5000 -a -e riscv_iommu_hpm_0/first-stage-page-table-walks,config1=0x20c0010000000000/ dmatest; sleep 1
 [   68.050220] event_source riscv_iommu_hpm_0: Setting event filter: 20c0010000000007, PID PSCID: 0x0, DID GSCID: 0xc0010, PV PSCV: 0x0, DV GSCV: 0x1, IDT: 0x0, DMASK: 0x0, Index: 0
 [   68.152992] dmatest: Started 1 threads using dma0chan0
 [   68.158071] dmatest: dma0chan0-copy0: summary 1 tests, 0 failures 401.92 iops 401 KB/s (0)

Performance counter stats for 'system wide':

                  6      riscv_iommu_hpm_0/first-stage-page-table-walks,config1=0x20c0010000000000/                                   
 
        0.083192000 seconds time elapsed

Jingyu Li (3):
iommu/riscv: Enable IOMMU DMA mapping support iommu/riscv: Fix WSI mode IRQ number handling iommu/riscv: Add HPM support for performance monitoring

Lv Zheng (3):
spacemit/t100: Add vendor event support for RISC-V IOMMU HPM spacemit/t100: Add global filter support for RISC-V IOMMU HPM spacemit/t100: Add SpacemiT T100 IOATC HPM support

 .../bindings/iommu/riscv,iommu.yaml           |    6 +
 drivers/iommu/Kconfig                         |    2 +-
 drivers/iommu/riscv/Kconfig                   |    9 +
 drivers/iommu/riscv/Makefile                  |    1 +
 drivers/iommu/riscv/iommu-bits.h              |   19 +-
 drivers/iommu/riscv/iommu-hpm.c               | 1141 +++++++++++++++++
 drivers/iommu/riscv/iommu-pci.c               |   13 +-
 drivers/iommu/riscv/iommu-platform.c          |   12 +-
 drivers/iommu/riscv/iommu.c                   |   25 +-
 drivers/iommu/riscv/iommu.h                   |   44 +-
 10 files changed, 1259 insertions(+), 13 deletions(-)
 create mode 100644 drivers/iommu/riscv/iommu-hpm.c

2.43.0

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