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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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7439507f01
The omapdrm DMM code sometimes crashes with: WARNING: CPU: 0 PID: 1235 at lib/list_debug.c:36 __list_add+0x8c/0xbc() list_add double add: new=e9265368, prev=e90139c4, next=e9265368. This is caused by the code calling release_engine() twice for the same engine. dmm_txn_commit(wait=true) call is supposed to wait until the DMM transaction has been finished. And it does that, but it does not wait for the irq handler to finish. What happens is that the irq handler is triggered, and it either wakes up the thread that called dmm_txn_commit(), or that thread never even slept because the transaction was finished in the HW very quickly. That thread then continues executing, even if the irq handler is not yet finished, and a new transaction may be initiated. If that transaction is async (i.e. wait=false), a 'async' flag is set to true. The original irq handler, which has yet not finished, then sees the transaction as 'async', even if it was supposed to be 'sync'. When that happens, the irq handler does an extra release_engine() call because it thinks it need to release the engine, leading to the crash. This patch fixes the issue by using completion to ensure that the irq handler has finished before a dmm_txn_commit(wait=true) may continue. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
195 lines
4.8 KiB
C
195 lines
4.8 KiB
C
/*
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*
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* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
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* Author: Rob Clark <rob@ti.com>
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* Andy Gross <andy.gross@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef OMAP_DMM_PRIV_H
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#define OMAP_DMM_PRIV_H
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#define DMM_REVISION 0x000
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#define DMM_HWINFO 0x004
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#define DMM_LISA_HWINFO 0x008
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#define DMM_DMM_SYSCONFIG 0x010
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#define DMM_LISA_LOCK 0x01C
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#define DMM_LISA_MAP__0 0x040
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#define DMM_LISA_MAP__1 0x044
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#define DMM_TILER_HWINFO 0x208
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#define DMM_TILER_OR__0 0x220
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#define DMM_TILER_OR__1 0x224
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#define DMM_PAT_HWINFO 0x408
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#define DMM_PAT_GEOMETRY 0x40C
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#define DMM_PAT_CONFIG 0x410
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#define DMM_PAT_VIEW__0 0x420
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#define DMM_PAT_VIEW__1 0x424
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#define DMM_PAT_VIEW_MAP__0 0x440
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#define DMM_PAT_VIEW_MAP_BASE 0x460
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#define DMM_PAT_IRQ_EOI 0x478
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#define DMM_PAT_IRQSTATUS_RAW 0x480
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#define DMM_PAT_IRQSTATUS 0x490
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#define DMM_PAT_IRQENABLE_SET 0x4A0
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#define DMM_PAT_IRQENABLE_CLR 0x4B0
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#define DMM_PAT_STATUS__0 0x4C0
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#define DMM_PAT_STATUS__1 0x4C4
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#define DMM_PAT_STATUS__2 0x4C8
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#define DMM_PAT_STATUS__3 0x4CC
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#define DMM_PAT_DESCR__0 0x500
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#define DMM_PAT_DESCR__1 0x510
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#define DMM_PAT_DESCR__2 0x520
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#define DMM_PAT_DESCR__3 0x530
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#define DMM_PEG_HWINFO 0x608
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#define DMM_PEG_PRIO 0x620
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#define DMM_PEG_PRIO_PAT 0x640
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#define DMM_IRQSTAT_DST (1<<0)
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#define DMM_IRQSTAT_LST (1<<1)
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#define DMM_IRQSTAT_ERR_INV_DSC (1<<2)
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#define DMM_IRQSTAT_ERR_INV_DATA (1<<3)
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#define DMM_IRQSTAT_ERR_UPD_AREA (1<<4)
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#define DMM_IRQSTAT_ERR_UPD_CTRL (1<<5)
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#define DMM_IRQSTAT_ERR_UPD_DATA (1<<6)
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#define DMM_IRQSTAT_ERR_LUT_MISS (1<<7)
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#define DMM_IRQSTAT_ERR_MASK (DMM_IRQ_STAT_ERR_INV_DSC | \
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DMM_IRQ_STAT_ERR_INV_DATA | \
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DMM_IRQ_STAT_ERR_UPD_AREA | \
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DMM_IRQ_STAT_ERR_UPD_CTRL | \
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DMM_IRQ_STAT_ERR_UPD_DATA | \
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DMM_IRQ_STAT_ERR_LUT_MISS)
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#define DMM_PATSTATUS_READY (1<<0)
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#define DMM_PATSTATUS_VALID (1<<1)
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#define DMM_PATSTATUS_RUN (1<<2)
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#define DMM_PATSTATUS_DONE (1<<3)
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#define DMM_PATSTATUS_LINKED (1<<4)
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#define DMM_PATSTATUS_BYPASSED (1<<7)
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#define DMM_PATSTATUS_ERR_INV_DESCR (1<<10)
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#define DMM_PATSTATUS_ERR_INV_DATA (1<<11)
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#define DMM_PATSTATUS_ERR_UPD_AREA (1<<12)
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#define DMM_PATSTATUS_ERR_UPD_CTRL (1<<13)
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#define DMM_PATSTATUS_ERR_UPD_DATA (1<<14)
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#define DMM_PATSTATUS_ERR_ACCESS (1<<15)
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/* note: don't treat DMM_PATSTATUS_ERR_ACCESS as an error */
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#define DMM_PATSTATUS_ERR (DMM_PATSTATUS_ERR_INV_DESCR | \
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DMM_PATSTATUS_ERR_INV_DATA | \
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DMM_PATSTATUS_ERR_UPD_AREA | \
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DMM_PATSTATUS_ERR_UPD_CTRL | \
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DMM_PATSTATUS_ERR_UPD_DATA)
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enum {
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PAT_STATUS,
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PAT_DESCR
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};
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struct pat_ctrl {
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u32 start:4;
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u32 dir:4;
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u32 lut_id:8;
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u32 sync:12;
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u32 ini:4;
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};
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struct pat {
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uint32_t next_pa;
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struct pat_area area;
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struct pat_ctrl ctrl;
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uint32_t data_pa;
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};
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#define DMM_FIXED_RETRY_COUNT 1000
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/* create refill buffer big enough to refill all slots, plus 3 descriptors..
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* 3 descriptors is probably the worst-case for # of 2d-slices in a 1d area,
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* but I guess you don't hit that worst case at the same time as full area
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* refill
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*/
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#define DESCR_SIZE 128
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#define REFILL_BUFFER_SIZE ((4 * 128 * 256) + (3 * DESCR_SIZE))
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/* For OMAP5, a fixed offset is added to all Y coordinates for 1D buffers.
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* This is used in programming to address the upper portion of the LUT
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*/
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#define OMAP5_LUT_OFFSET 128
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struct dmm;
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struct dmm_txn {
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void *engine_handle;
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struct tcm *tcm;
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uint8_t *current_va;
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dma_addr_t current_pa;
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struct pat *last_pat;
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};
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struct refill_engine {
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int id;
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struct dmm *dmm;
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struct tcm *tcm;
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uint8_t *refill_va;
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dma_addr_t refill_pa;
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/* only one trans per engine for now */
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struct dmm_txn txn;
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bool async;
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struct completion compl;
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struct list_head idle_node;
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};
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struct dmm_platform_data {
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uint32_t cpu_cache_flags;
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};
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struct dmm {
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struct device *dev;
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void __iomem *base;
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int irq;
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struct page *dummy_page;
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dma_addr_t dummy_pa;
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void *refill_va;
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dma_addr_t refill_pa;
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/* refill engines */
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wait_queue_head_t engine_queue;
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struct list_head idle_head;
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struct refill_engine *engines;
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int num_engines;
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atomic_t engine_counter;
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/* container information */
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int container_width;
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int container_height;
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int lut_width;
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int lut_height;
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int num_lut;
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/* array of LUT - TCM containers */
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struct tcm **tcm;
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/* allocation list and lock */
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struct list_head alloc_head;
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const struct dmm_platform_data *plat_data;
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};
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#endif
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