// SPDX-License-Identifier: GPL-2.0-only OR MIT
/* Copyright (c) 2023 Imagination Technologies Ltd. */
#include "pvr_ccb.h"
#include "pvr_cccb.h"
#include "pvr_device.h"
#include "pvr_gem.h"
#include "pvr_hwrt.h"
#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/jiffies.h>
#include <linux/mutex.h>
#include <linux/types.h>
static __always_inline u32
get_ccb_space(u32 w_off, u32 r_off, u32 ccb_size)
{
return (((r_off) - (w_off)) + ((ccb_size) - 1)) & ((ccb_size) - 1);
}
static void
cccb_ctrl_init(void *cpu_ptr, void *priv)
{
struct rogue_fwif_cccb_ctl *ctrl = cpu_ptr;
struct pvr_cccb *pvr_cccb = priv;
WRITE_ONCE(ctrl->write_offset, 0);
WRITE_ONCE(ctrl->read_offset, 0);
WRITE_ONCE(ctrl->dep_offset, 0);
WRITE_ONCE(ctrl->wrap_mask, pvr_cccb->wrap_mask);
}
/**
* pvr_cccb_init() - Initialise a Client CCB
* @pvr_dev: Device pointer.
* @pvr_cccb: Pointer to Client CCB structure to initialise.
* @size_log2: Log2 size of Client CCB in bytes.
* @name: Name of owner of Client CCB. Used for fence context.
*
* Return:
* * Zero on success, or
* * Any error code returned by pvr_fw_object_create_and_map().
*/
int
pvr_cccb_init(struct pvr_device *pvr_dev, struct pvr_cccb *pvr_cccb,
u32 size_log2, const char *name)
{
size_t size = 1 << size_log2;
int err;
pvr_cccb->size = size;
pvr_cccb->write_offset = 0;
pvr_cccb->wrap_mask = size - 1;
/*
* Map CCCB and control structure as uncached, so we don't have to flush
* CPU cache repeatedly when polling for space.
*/
pvr_cccb->ctrl = pvr_fw_object_create_and_map(pvr_dev, sizeof(*pvr_cccb->ctrl),
PVR_BO_FW_FLAGS_DEVICE_UNCACHED,
cccb_ctrl_init, pvr_cccb,
&pvr_cccb->ctrl_obj);
if (IS_ERR(pvr_cccb->ctrl))
return PTR_ERR(pvr_cccb->ctrl);
pvr_cccb->cccb = pvr_fw_object_create_and_map(pvr_dev, size,
PVR_BO_FW_FLAGS_DEVICE_UNCACHED,
NULL, NULL, &pvr_cccb->cccb_obj);
if (IS_ERR(pvr_cccb->cccb)) {
err = PTR_ERR(pvr_cccb->cccb);
goto err_free_ctrl;
}
pvr_fw_object_get_fw_addr(pvr_cccb->ctrl_obj, &pvr_cccb->ctrl_fw_addr);
pvr_fw_object_get_fw_addr(pvr_cccb->cccb_obj, &pvr_cccb->cccb_fw_addr);
return 0;
err_free_ctrl:
pvr_fw_object_unmap_and_destroy(pvr_cccb->ctrl_obj);
return err;
}
/**
* pvr_cccb_fini() - Release Client CCB structure
* @pvr_cccb: Client CCB to release.
*/
void
pvr_cccb_fini(struct pvr_cccb *pvr_cccb)
{
pvr_fw_object_unmap_and_destroy(pvr_cccb->cccb_obj);
pvr_fw_object_unmap_and_destroy(pvr_cccb->ctrl_obj);
}
/**
* pvr_cccb_cmdseq_fits() - Check if a command sequence fits in the CCCB
* @pvr_cccb: Target Client CCB.
* @size: Size of the command sequence.
*
* Check if a command sequence fits in the CCCB we have at hand.
*
* Return:
* * true if the command sequence fits in the CCCB, or
* * false otherwise.
*/
bool pvr_cccb_cmdseq_fits(struct pvr_cccb *pvr_cccb, size_t size)
{
struct rogue_fwif_cccb_ctl *ctrl = pvr_cccb->ctrl;
u32 read_offset, remaining;
bool fits = false;
read_offset = READ_ONCE(ctrl->read_offset);
remaining = pvr_cccb->size - pvr_cccb->write_offset;
/* Always ensure we have enough room for a padding command at the end of the CCCB.
* If our command sequence does not fit, reserve the remaining space for a padding
* command.
*/
if (size + PADDING_COMMAND_SIZE > remaining)
size += remaining;
if (get_ccb_space(pvr_cccb->write_offset, read_offset, pvr_cccb->size) >= size)
fits = true;
return fits;
}
/**
* pvr_cccb_write_command_with_header() - Write a command + command header to a
* Client CCB
* @pvr_cccb: Target Client CCB.
* @cmd_type: Client CCB command type. Must be one of %ROGUE_FWIF_CCB_CMD_TYPE_*.
* @cmd_size: Size of command in bytes.
* @cmd_data: Pointer to command to write.
* @ext_job_ref: External job reference.
* @int_job_ref: Internal job reference.
*
* Caller must make sure there's enough space in CCCB to queue this command. This
* can be done by calling pvr_cccb_cmdseq_fits().
*
* This function is not protected by any lock. The caller must ensure there's
* no concurrent caller, which should be guaranteed by the drm_sched model (job
* submission is serialized in drm_sched_main()).
*/
void
pvr_cccb_write_command_with_header(struct pvr_cccb *pvr_cccb, u32 cmd_type, u32 cmd_size,
void *cmd_data, u32 ext_job_ref, u32 int_job_ref)
{
u32 sz_with_hdr = pvr_cccb_get_size_of_cmd_with_hdr(cmd_size);
struct rogue_fwif_ccb_cmd_header cmd_header = {
.cmd_type = cmd_type,
.cmd_size = ALIGN(cmd_size, 8),
.ext_job_ref = ext_job_ref,
.int_job_ref = int_job_ref,
};
struct rogue_fwif_cccb_ctl *ctrl = pvr_cccb->ctrl;
u32 remaining = pvr_cccb->size - pvr_cccb->write_offset;
u32 required_size, cccb_space, read_offset;
/*
* Always ensure we have enough room for a padding command at the end of
* the CCCB.
*/
if (remaining < sz_with_hdr + PADDING_COMMAND_SIZE) {
/*
* Command would need to wrap, so we need to pad the remainder
* of the CCCB.
*/
required_size = sz_with_hdr + remaining;
} else {
required_size = sz_with_hdr;
}
read_offset = READ_ONCE(ctrl->read_offset);
cccb_space = get_ccb_space(pvr_cccb->write_offset, read_offset, pvr_cccb->size);
if (WARN_ON(cccb_space < required_size))
return;
if (required_size != sz_with_hdr) {
/* Add padding command */
struct rogue_fwif_ccb_cmd_header pad_cmd = {
.cmd_type = ROGUE_FWIF_CCB_CMD_TYPE_PADDING,
.cmd_size = remaining - sizeof(pad_cmd),
};
memcpy(&pvr_cccb->cccb[pvr_cccb->write_offset], &pad_cmd, sizeof(pad_cmd));
pvr_cccb->write_offset = 0;
}
memcpy(&pvr_cccb->cccb[pvr_cccb->write_offset], &cmd_header, sizeof(cmd_header));
memcpy(&pvr_cccb->cccb[pvr_cccb->write_offset + sizeof(cmd_header)], cmd_data, cmd_size);
pvr_cccb->write_offset += sz_with_hdr;
}
static void fill_cmd_kick_data(struct pvr_cccb *cccb, u32 ctx_fw_addr,
struct pvr_hwrt_data *hwrt,
struct rogue_fwif_kccb_cmd_kick_data *k)
{
k->context_fw_addr = ctx_fw_addr;
k->client_woff_update = cccb->write_offset;
k->client_wrap_mask_update = cccb->wrap_mask;
if (hwrt) {
u32 cleanup_state_offset = offsetof(struct rogue_fwif_hwrtdata, cleanup_state);
pvr_fw_object_get_fw_addr_offset(hwrt->fw_obj, cleanup_state_offset,
&k->cleanup_ctl_fw_addr[k->num_cleanup_ctl++]);
}
}
/**
* pvr_cccb_send_kccb_kick: Send KCCB kick to trigger command processing
* @pvr_dev: Device pointer.
* @pvr_cccb: Pointer to CCCB to process.
* @cctx_fw_addr: FW virtual address for context owning this Client CCB.
* @hwrt: HWRT data set associated with this kick. May be %NULL.
*
* You must call pvr_kccb_reserve_slot() and wait for the returned fence to
* signal (if this function didn't return NULL) before calling
* pvr_cccb_send_kccb_kick().
*/
void
pvr_cccb_send_kccb_kick(struct pvr_device *pvr_dev,
struct pvr_cccb *pvr_cccb, u32 cctx_fw_addr,
struct pvr_hwrt_data *hwrt)
{
struct rogue_fwif_kccb_cmd cmd_kick = {
.cmd_type = ROGUE_FWIF_KCCB_CMD_KICK,
};
fill_cmd_kick_data(pvr_cccb, cctx_fw_addr, hwrt, &cmd_kick.cmd_data.cmd_kick_data);
/* Make sure the writes to the CCCB are flushed before sending the KICK. */
wmb();
pvr_kccb_send_cmd_reserved_powered(pvr_dev, &cmd_kick, NULL);
}
void
pvr_cccb_send_kccb_combined_kick(struct pvr_device *pvr_dev,
struct pvr_cccb *geom_cccb,
struct pvr_cccb *frag_cccb,
u32 geom_ctx_fw_addr,
u32 frag_ctx_fw_addr,
struct pvr_hwrt_data *hwrt,
bool frag_is_pr)
{
struct rogue_fwif_kccb_cmd cmd_kick = {
.cmd_type = ROGUE_FWIF_KCCB_CMD_COMBINED_GEOM_FRAG_KICK,
};
fill_cmd_kick_data(geom_cccb, geom_ctx_fw_addr, hwrt,
&cmd_kick.cmd_data.combined_geom_frag_cmd_kick_data.geom_cmd_kick_data);
/* If this is a partial-render job, we don't attach resources to cleanup-ctl array,
* because the resources are already retained by the geometry job.
*/
fill_cmd_kick_data(frag_cccb, frag_ctx_fw_addr, frag_is_pr ? NULL : hwrt,
&cmd_kick.cmd_data.combined_geom_frag_cmd_kick_data.frag_cmd_kick_data);
/* Make sure the writes to the CCCB are flushed before sending the KICK. */
wmb();
pvr_kccb_send_cmd_reserved_powered(pvr_dev, &cmd_kick, NULL);
}
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