habanalabs: restore unsecured registers default values

unsecured registers can be changed by the user, and hence should be
restored to their default values in context switch

Signed-off-by: Dalit Ben Zoor <dbenzoor@habana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
index 87859c5..81c1d57 100644 (file)
--- a/drivers/misc/habanalabs/goya/goya.c
+++ b/drivers/misc/habanalabs/goya/goya.c
@@ -786,7 +786,6 @@ static void goya_init_dma_ch(struct hl_device *hdev, int dma_id)
        else
                sob_addr = CFG_BASE + mmSYNC_MNGR_SOB_OBJ_1007;
 
-       WREG32(mmDMA_CH_0_WR_COMP_ADDR_LO + reg_off, lower_32_bits(sob_addr));
        WREG32(mmDMA_CH_0_WR_COMP_ADDR_HI + reg_off, upper_32_bits(sob_addr));
        WREG32(mmDMA_CH_0_WR_COMP_WDATA + reg_off, 0x80000001);
 }
@@ -4560,10 +4559,12 @@ release_cb:
 int goya_context_switch(struct hl_device *hdev, u32 asid)
 {
        struct asic_fixed_properties *prop = &hdev->asic_prop;
-       u64 addr = prop->sram_base_address;
+       u64 addr = prop->sram_base_address, sob_addr;
        u32 size = hdev->pldm ? 0x10000 : prop->sram_size;
        u64 val = 0x7777777777777777ull;
-       int rc;
+       int rc, dma_id;
+       u32 channel_off = mmDMA_CH_1_WR_COMP_ADDR_LO -
+                                       mmDMA_CH_0_WR_COMP_ADDR_LO;
 
        rc = goya_memset_device_memory(hdev, addr, size, val, false);
        if (rc) {
@@ -4571,7 +4572,19 @@ int goya_context_switch(struct hl_device *hdev, u32 asid)
                return rc;
        }
 
+       /* we need to reset registers that the user is allowed to change */
+       sob_addr = CFG_BASE + mmSYNC_MNGR_SOB_OBJ_1007;
+       WREG32(mmDMA_CH_0_WR_COMP_ADDR_LO, lower_32_bits(sob_addr));
+
+       for (dma_id = 1 ; dma_id < NUMBER_OF_EXT_HW_QUEUES ; dma_id++) {
+               sob_addr = CFG_BASE + mmSYNC_MNGR_SOB_OBJ_1000 +
+                                                       (dma_id - 1) * 4;
+               WREG32(mmDMA_CH_0_WR_COMP_ADDR_LO + channel_off * dma_id,
+                                               lower_32_bits(sob_addr));
+       }
+
        WREG32(mmTPC_PLL_CLK_RLX_0, 0x200020);
+
        goya_mmu_prepare(hdev, asid);
 
        goya_clear_sm_regs(hdev);