1 files changed, 260 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/sim_pci.c b/drivers/gpu/nvgpu/common/sim_pci.c
new file mode 100644
index 00000000..b4ca7bad
--- /dev/null
+++ b/drivers/gpu/nvgpu/common/sim_pci.c
@@ -0,0 +1,260 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * 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 AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+#include <nvgpu/log.h>
+#include <nvgpu/bitops.h>
+#include <nvgpu/nvgpu_mem.h>
+#include <nvgpu/dma.h>
+#include <nvgpu/hw_sim_pci.h>
+#include "gk20a/gk20a.h"
+#include "linux/sim.h"
+
+static inline u32 sim_msg_header_size(void)
+{
+        return 32U;
+}
+
+static inline u32 *sim_msg_bfr(struct gk20a *g, u32 byte_offset)
+{
+        u8 *cpu_va;
+
+        cpu_va = (u8 *)g->sim->msg_bfr.cpu_va;
+
+        return (u32 *)(cpu_va + byte_offset);
+}
+
+static inline u32 *sim_msg_hdr(struct gk20a *g, u32 byte_offset)
+{
+        return sim_msg_bfr(g, byte_offset); /* starts at 0 */
+}
+
+static inline u32 *sim_msg_param(struct gk20a *g, u32 byte_offset)
+{
+        /* starts after msg header/cmn */
+        return sim_msg_bfr(g, byte_offset + sim_msg_header_size());
+}
+
+static inline void sim_write_hdr(struct gk20a *g, u32 func, u32 size)
+{
+        *sim_msg_hdr(g, sim_msg_header_version_r()) =
+                sim_msg_header_version_major_tot_v() |
+                sim_msg_header_version_minor_tot_v();
+        *sim_msg_hdr(g, sim_msg_signature_r()) = sim_msg_signature_valid_v();
+        *sim_msg_hdr(g, sim_msg_result_r())    = sim_msg_result_rpc_pending_v();
+        *sim_msg_hdr(g, sim_msg_spare_r())     = sim_msg_spare__init_v();
+        *sim_msg_hdr(g, sim_msg_function_r())  = func;
+        *sim_msg_hdr(g, sim_msg_length_r())    = size + sim_msg_header_size();
+}
+
+static inline u32 sim_escape_read_hdr_size(void)
+{
+        return 12U;
+}
+
+static u32 *sim_send_ring_bfr(struct gk20a *g, u32 byte_offset)
+{
+        u8 *cpu_va;
+
+        cpu_va = (u8 *)g->sim->send_bfr.cpu_va;
+
+        return (u32 *)(cpu_va + byte_offset);
+}
+
+static int rpc_send_message(struct gk20a *g)
+{
+        /* calculations done in units of u32s */
+        u32 send_base = sim_send_put_pointer_v(g->sim->send_ring_put) * 2;
+        u32 dma_offset = send_base + sim_dma_r()/sizeof(u32);
+        u32 dma_hi_offset = send_base + sim_dma_hi_r()/sizeof(u32);
+
+        *sim_send_ring_bfr(g, dma_offset*sizeof(u32)) =
+                sim_dma_target_phys_pci_coherent_f() |
+                sim_dma_status_valid_f() |
+                sim_dma_size_4kb_f() |
+                sim_dma_addr_lo_f(nvgpu_mem_get_addr(g, &g->sim->msg_bfr)
+                                >> PAGE_SHIFT);
+
+        *sim_send_ring_bfr(g, dma_hi_offset*sizeof(u32)) =
+                u64_hi32(nvgpu_mem_get_addr(g, &g->sim->msg_bfr));
+
+        *sim_msg_hdr(g, sim_msg_sequence_r()) = g->sim->sequence_base++;
+
+        g->sim->send_ring_put = (g->sim->send_ring_put + 2 * sizeof(u32)) %
+                PAGE_SIZE;
+
+        /* Update the put pointer. This will trap into the host. */
+        sim_writel(g->sim, sim_send_put_r(), g->sim->send_ring_put);
+
+        return 0;
+}
+
+static inline u32 *sim_recv_ring_bfr(struct gk20a *g, u32 byte_offset)
+{
+        u8 *cpu_va;
+
+        cpu_va = (u8 *)g->sim->recv_bfr.cpu_va;
+
+        return (u32 *)(cpu_va + byte_offset);
+}
+
+static int rpc_recv_poll(struct gk20a *g)
+{
+        u64 recv_phys_addr;
+
+        /* Poll the recv ring get pointer in an infinite loop */
+        do {
+                g->sim->recv_ring_put = sim_readl(g->sim, sim_recv_put_r());
+        } while (g->sim->recv_ring_put == g->sim->recv_ring_get);
+
+        /* process all replies */
+        while (g->sim->recv_ring_put != g->sim->recv_ring_get) {
+                /* these are in u32 offsets */
+                u32 dma_lo_offset =
+                        sim_recv_put_pointer_v(g->sim->recv_ring_get)*2 + 0;
+                u32 dma_hi_offset = dma_lo_offset + 1;
+                u32 recv_phys_addr_lo = sim_dma_addr_lo_v(
+                                *sim_recv_ring_bfr(g, dma_lo_offset*4));
+                u32 recv_phys_addr_hi = sim_dma_hi_addr_v(
+                                *sim_recv_ring_bfr(g, dma_hi_offset*4));
+
+                recv_phys_addr = (u64)recv_phys_addr_hi << 32 |
+                                 (u64)recv_phys_addr_lo << PAGE_SHIFT;
+
+                if (recv_phys_addr != nvgpu_mem_get_addr(g, &g->sim->msg_bfr)) {
+                        nvgpu_err(g, "Error in RPC reply");
+                        return -EINVAL;
+                }
+
+                /* Update GET pointer */
+                g->sim->recv_ring_get = (g->sim->recv_ring_get + 2*sizeof(u32))
+                        % PAGE_SIZE;
+
+                sim_writel(g->sim, sim_recv_get_r(), g->sim->recv_ring_get);
+
+                g->sim->recv_ring_put = sim_readl(g->sim, sim_recv_put_r());
+        }
+
+        return 0;
+}
+
+static int issue_rpc_and_wait(struct gk20a *g)
+{
+        int err;
+
+        err = rpc_send_message(g);
+        if (err) {
+                nvgpu_err(g, "failed rpc_send_message");
+                return err;
+        }
+
+        err = rpc_recv_poll(g);
+        if (err) {
+                nvgpu_err(g, "failed rpc_recv_poll");
+                return err;
+        }
+
+        /* Now check if RPC really succeeded */
+        if (*sim_msg_hdr(g, sim_msg_result_r()) != sim_msg_result_success_v()) {
+                nvgpu_err(g, "received failed status!");
+                return -EINVAL;
+        }
+        return 0;
+}
+
+static int nvgpu_sim_esc_readl(struct gk20a *g,
+                char *path, u32 index, u32 *data)
+{
+        int err;
+        size_t pathlen = strlen(path);
+        u32 data_offset;
+
+        sim_write_hdr(g, sim_msg_function_sim_escape_read_v(),
+                      sim_escape_read_hdr_size());
+        *sim_msg_param(g, 0) = index;
+        *sim_msg_param(g, 4) = sizeof(u32);
+        data_offset = roundup(pathlen + 1, sizeof(u32));
+        *sim_msg_param(g, 8) = data_offset;
+        strcpy((char *)sim_msg_param(g, 0xc), path);
+
+        err = issue_rpc_and_wait(g);
+
+        if (!err)
+                memcpy(data, sim_msg_param(g, data_offset + 0xc), sizeof(u32));
+        return err;
+}
+
+int nvgpu_init_sim_support_pci(struct gk20a *g)
+{
+        int err = -ENOMEM;
+        u64 phys;
+
+        if (!g->sim)
+                return 0;
+
+        /* allocate sim event/msg buffers */
+        err = nvgpu_alloc_sim_buffer(g, &g->sim->send_bfr);
+        err = err || nvgpu_alloc_sim_buffer(g, &g->sim->recv_bfr);
+        err = err || nvgpu_alloc_sim_buffer(g, &g->sim->msg_bfr);
+
+        if (err)
+                goto fail;
+        /* mark send ring invalid */
+        sim_writel(g->sim, sim_send_ring_r(), sim_send_ring_status_invalid_f());
+
+        /* read get pointer and make equal to put */
+        g->sim->send_ring_put = sim_readl(g->sim, sim_send_get_r());
+        sim_writel(g->sim, sim_send_put_r(), g->sim->send_ring_put);
+
+        /* write send ring address and make it valid */
+        phys = nvgpu_mem_get_addr(g, &g->sim->send_bfr);
+        sim_writel(g->sim, sim_send_ring_hi_r(),
+                   sim_send_ring_hi_addr_f(u64_hi32(phys)));
+        sim_writel(g->sim, sim_send_ring_r(),
+                   sim_send_ring_status_valid_f() |
+                   sim_send_ring_target_phys_pci_coherent_f() |
+                   sim_send_ring_size_4kb_f() |
+                   sim_send_ring_addr_lo_f(phys >> PAGE_SHIFT));
+
+        /* repeat for recv ring (but swap put,get as roles are opposite) */
+        sim_writel(g->sim, sim_recv_ring_r(), sim_recv_ring_status_invalid_f());
+
+        /* read put pointer and make equal to get */
+        g->sim->recv_ring_get = sim_readl(g->sim, sim_recv_put_r());
+        sim_writel(g->sim, sim_recv_get_r(), g->sim->recv_ring_get);
+
+        /* write send ring address and make it valid */
+        phys = nvgpu_mem_get_addr(g, &g->sim->recv_bfr);
+        sim_writel(g->sim, sim_recv_ring_hi_r(),
+                   sim_recv_ring_hi_addr_f(u64_hi32(phys)));
+        sim_writel(g->sim, sim_recv_ring_r(),
+                   sim_recv_ring_status_valid_f() |
+                   sim_recv_ring_target_phys_pci_coherent_f() |
+                   sim_recv_ring_size_4kb_f() |
+                   sim_recv_ring_addr_lo_f(phys >> PAGE_SHIFT));
+
+        g->sim->remove_support = nvgpu_remove_sim_support;
+        g->sim->esc_readl = nvgpu_sim_esc_readl;
+        return 0;
+
+ fail:
+        nvgpu_free_sim_support(g);
+        return err;
+}