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gpu: nvgpu: sim: make ring buffer independent of PAGE_SIZE

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The simulator ring buffer DMA interface supports buffers of the following sizes:
4, 8, 12 and 16K. At present, it is configured to 4K and it  happens to match
with the kernel PAGE_SIZE, which is used to wrap back the GET/PUT pointers once
4K is reached. However, this is not always true; for instance, take 64K pages.
Hence, replace PAGE_SIZE with SIM_BFR_SIZE.

Introduce macro NVGPU_CPU_PAGE_SIZE which aliases to PAGE_SIZE and replace
latter with former.

Bug 200658101
Jira NVGPU-6018

Change-Id: I83cc62b87291734015c51f3e5a98173549e065de
Signed-off-by: Antony Clince Alex <aalex@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2420728
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Antony Clince Alex
2020-09-28 16:44:40 +05:30
committed by Alex Waterman
parent 09857ecd91
commit c36752fe3d
37 changed files with 120 additions and 103 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpu/nvgpu/common/sim/sim.c
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@@ -36,7 +36,7 @@ int nvgpu_alloc_sim_buffer(struct gk20a *g, struct nvgpu_mem *mem)
int err = 0;
if (!nvgpu_mem_is_valid(mem)) {
err = nvgpu_dma_alloc_sys(g, PAGE_SIZE, mem);
err = nvgpu_dma_alloc_sys(g, NVGPU_CPU_PAGE_SIZE, mem);
}
return err;
@@ -67,7 +67,7 @@ void nvgpu_remove_sim_support(struct gk20a *g)
void sim_write_hdr(struct gk20a *g, u32 func, u32 size)
{
/*memset(g->sim->msg_bfr.kvaddr,0,min(PAGE_SIZE,size));*/
/*memset(g->sim->msg_bfr.kvaddr,0,min(NVGPU_CPU_PAGE_SIZE,size));*/
*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();
@@ -104,7 +104,7 @@ static int rpc_send_message(struct gk20a *g)
*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;
% SIM_BFR_SIZE;
/* Update the put pointer. This will trap into the host. */
sim_writel(g->sim, sim_send_put_r(), g->sim->send_ring_put);
@@ -156,7 +156,7 @@ static int rpc_recv_poll(struct gk20a *g)
/* Update GET pointer */
g->sim->recv_ring_get = (g->sim->recv_ring_get + 2*sizeof(u32))
% PAGE_SIZE;
% SIM_BFR_SIZE;
sim_writel(g->sim, sim_recv_get_r(), g->sim->recv_ring_get);