Re: [PATCH v11 1/4] remoteproc: zynqmp: fix lockstep mode memory region

Mathieu Poirier
2024-02-28T20:03:56Z

On Wed, 28 Feb 2024 at 12:24, Tanmay Shah <tanmay.shah@amd.com> wrote:
>
>
> On 2/28/24 11:08 AM, Mathieu Poirier wrote:
> > On Mon, Feb 19, 2024 at 09:44:34AM -0800, Tanmay Shah wrote:
> > > In lockstep mode, r5 core0 uses TCM of R5 core1. Following is lockstep
> > > mode memory region as per hardware reference manual.
> > >
> > > | *TCM* | *R5 View* | *Linux view* |
> > > | R5_0 ATCM (128 KB) | 0x0000_0000 | 0xFFE0_0000 |
> > > | R5_0 BTCM (128 KB) | 0x0002_0000 | 0xFFE2_0000 |
> > >
> > > However, driver shouldn't model it as above because R5 core0 TCM and core1
> > > TCM has different power-domains mapped to it.
> > > Hence, TCM address space in lockstep mode should be modeled as 64KB
> > > regions only where each region has its own power-domain as following:
> > >
> > > | *TCM* | *R5 View* | *Linux view* |
> > > | R5_0 ATCM0 (64 KB) | 0x0000_0000 | 0xFFE0_0000 |
> > > | R5_0 BTCM0 (64 KB) | 0x0002_0000 | 0xFFE2_0000 |
> > > | R5_0 ATCM1 (64 KB) | 0x0001_0000 | 0xFFE1_0000 |
> > > | R5_0 BTCM1 (64 KB) | 0x0003_0000 | 0xFFE3_0000 |
> > >
> > > This makes driver maintanance easy and makes design robust for future
> > > platorms as well.
> > >
> > > Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
> >
> > Now that I have a clearer picture of where things are going, I am adding this
> > patch to rproc-next.
> >
> > I'll wait for the DT crew for the rest of this set.
>
> Hi Mathieu,
>
> Is it okay if we wait for DT crew to clear new bindings as well before taking this one to rproc-next ?
>
> Just in case any modifications needed further?
>

Sure, we can do that too.

>
> Tanmay
>
>
> >
> > Thanks,
> > Mathieu
> >
> > > ---
> > > drivers/remoteproc/xlnx_r5_remoteproc.c | 145 ++----------------------
> > > 1 file changed, 12 insertions(+), 133 deletions(-)
> > >
> > > diff --git a/drivers/remoteproc/xlnx_r5_remoteproc.c b/drivers/remoteproc/xlnx_r5_remoteproc.c
> > > index 4395edea9a64..42b0384d34f2 100644
> > > --- a/drivers/remoteproc/xlnx_r5_remoteproc.c
> > > +++ b/drivers/remoteproc/xlnx_r5_remoteproc.c
> > > @@ -84,12 +84,12 @@ static const struct mem_bank_data zynqmp_tcm_banks_split[] = {
> > > {0xffeb0000UL, 0x20000, 0x10000UL, PD_R5_1_BTCM, "btcm1"},
> > > };
> > >
> > > -/* In lockstep mode cluster combines each 64KB TCM and makes 128KB TCM */
> > > +/* In lockstep mode cluster uses each 64KB TCM from second core as well */
> > > static const struct mem_bank_data zynqmp_tcm_banks_lockstep[] = {
> > > - {0xffe00000UL, 0x0, 0x20000UL, PD_R5_0_ATCM, "atcm0"}, /* TCM 128KB each */
> > > - {0xffe20000UL, 0x20000, 0x20000UL, PD_R5_0_BTCM, "btcm0"},
> > > - {0, 0, 0, PD_R5_1_ATCM, ""},
> > > - {0, 0, 0, PD_R5_1_BTCM, ""},
> > > + {0xffe00000UL, 0x0, 0x10000UL, PD_R5_0_ATCM, "atcm0"}, /* TCM 64KB each */
> > > + {0xffe20000UL, 0x20000, 0x10000UL, PD_R5_0_BTCM, "btcm0"},
> > > + {0xffe10000UL, 0x10000, 0x10000UL, PD_R5_1_ATCM, "atcm1"},
> > > + {0xffe30000UL, 0x30000, 0x10000UL, PD_R5_1_BTCM, "btcm1"},
> > > };
> > >
> > > /**
> > > @@ -540,14 +540,14 @@ static int tcm_mem_map(struct rproc *rproc,
> > > }
> > >
> > > /*
> > > - * add_tcm_carveout_split_mode()
> > > + * add_tcm_banks()
> > > * @rproc: single R5 core's corresponding rproc instance
> > > *
> > > - * allocate and add remoteproc carveout for TCM memory in split mode
> > > + * allocate and add remoteproc carveout for TCM memory
> > > *
> > > * return 0 on success, otherwise non-zero value on failure
> > > */
> > > -static int add_tcm_carveout_split_mode(struct rproc *rproc)
> > > +static int add_tcm_banks(struct rproc *rproc)
> > > {
> > > struct rproc_mem_entry *rproc_mem;
> > > struct zynqmp_r5_core *r5_core;
> > > @@ -580,10 +580,10 @@ static int add_tcm_carveout_split_mode(struct rproc *rproc)
> > > ZYNQMP_PM_REQUEST_ACK_BLOCKING);
> > > if (ret < 0) {
> > > dev_err(dev, "failed to turn on TCM 0x%x", pm_domain_id);
> > > - goto release_tcm_split;
> > > + goto release_tcm;
> > > }
> > >
> > > - dev_dbg(dev, "TCM carveout split mode %s addr=%llx, da=0x%x, size=0x%lx",
> > > + dev_dbg(dev, "TCM carveout %s addr=%llx, da=0x%x, size=0x%lx",
> > > bank_name, bank_addr, da, bank_size);
> > >
> > > rproc_mem = rproc_mem_entry_init(dev, NULL, bank_addr,
> > > @@ -593,7 +593,7 @@ static int add_tcm_carveout_split_mode(struct rproc *rproc)
> > > if (!rproc_mem) {
> > > ret = -ENOMEM;
> > > zynqmp_pm_release_node(pm_domain_id);
> > > - goto release_tcm_split;
> > > + goto release_tcm;
> > > }
> > >
> > > rproc_add_carveout(rproc, rproc_mem);
> > > @@ -601,7 +601,7 @@ static int add_tcm_carveout_split_mode(struct rproc *rproc)
> > >
> > > return 0;
> > >
> > > -release_tcm_split:
> > > +release_tcm:
> > > /* If failed, Turn off all TCM banks turned on before */
> > > for (i--; i >= 0; i--) {
> > > pm_domain_id = r5_core->tcm_banks[i]->pm_domain_id;
> > > @@ -610,127 +610,6 @@ static int add_tcm_carveout_split_mode(struct rproc *rproc)
> > > return ret;
> > > }
> > >
> > > -/*
> > > - * add_tcm_carveout_lockstep_mode()
> > > - * @rproc: single R5 core's corresponding rproc instance
> > > - *
> > > - * allocate and add remoteproc carveout for TCM memory in lockstep mode
> > > - *
> > > - * return 0 on success, otherwise non-zero value on failure
> > > - */
> > > -static int add_tcm_carveout_lockstep_mode(struct rproc *rproc)
> > > -{
> > > - struct rproc_mem_entry *rproc_mem;
> > > - struct zynqmp_r5_core *r5_core;
> > > - int i, num_banks, ret;
> > > - phys_addr_t bank_addr;
> > > - size_t bank_size = 0;
> > > - struct device *dev;
> > > - u32 pm_domain_id;
> > > - char *bank_name;
> > > - u32 da;
> > > -
> > > - r5_core = rproc->priv;
> > > - dev = r5_core->dev;
> > > -
> > > - /* Go through zynqmp banks for r5 node */
> > > - num_banks = r5_core->tcm_bank_count;
> > > -
> > > - /*
> > > - * In lockstep mode, TCM is contiguous memory block
> > > - * However, each TCM block still needs to be enabled individually.
> > > - * So, Enable each TCM block individually.
> > > - * Although ATCM and BTCM is contiguous memory block, add two separate
> > > - * carveouts for both.
> > > - */
> > > - for (i = 0; i < num_banks; i++) {
> > > - pm_domain_id = r5_core->tcm_banks[i]->pm_domain_id;
> > > -
> > > - /* Turn on each TCM bank individually */
> > > - ret = zynqmp_pm_request_node(pm_domain_id,
> > > - ZYNQMP_PM_CAPABILITY_ACCESS, 0,
> > > - ZYNQMP_PM_REQUEST_ACK_BLOCKING);
> > > - if (ret < 0) {
> > > - dev_err(dev, "failed to turn on TCM 0x%x", pm_domain_id);
> > > - goto release_tcm_lockstep;
> > > - }
> > > -
> > > - bank_size = r5_core->tcm_banks[i]->size;
> > > - if (bank_size == 0)
> > > - continue;
> > > -
> > > - bank_addr = r5_core->tcm_banks[i]->addr;
> > > - da = r5_core->tcm_banks[i]->da;
> > > - bank_name = r5_core->tcm_banks[i]->bank_name;
> > > -
> > > - /* Register TCM address range, TCM map and unmap functions */
> > > - rproc_mem = rproc_mem_entry_init(dev, NULL, bank_addr,
> > > - bank_size, da,
> > > - tcm_mem_map, tcm_mem_unmap,
> > > - bank_name);
> > > - if (!rproc_mem) {
> > > - ret = -ENOMEM;
> > > - zynqmp_pm_release_node(pm_domain_id);
> > > - goto release_tcm_lockstep;
> > > - }
> > > -
> > > - /* If registration is success, add carveouts */
> > > - rproc_add_carveout(rproc, rproc_mem);
> > > -
> > > - dev_dbg(dev, "TCM carveout lockstep mode %s addr=0x%llx, da=0x%x, size=0x%lx",
> > > - bank_name, bank_addr, da, bank_size);
> > > - }
> > > -
> > > - return 0;
> > > -
> > > -release_tcm_lockstep:
> > > - /* If failed, Turn off all TCM banks turned on before */
> > > - for (i--; i >= 0; i--) {
> > > - pm_domain_id = r5_core->tcm_banks[i]->pm_domain_id;
> > > - zynqmp_pm_release_node(pm_domain_id);
> > > - }
> > > - return ret;
> > > -}
> > > -
> > > -/*
> > > - * add_tcm_banks()
> > > - * @rproc: single R5 core's corresponding rproc instance
> > > - *
> > > - * allocate and add remoteproc carveouts for TCM memory based on cluster mode
> > > - *
> > > - * return 0 on success, otherwise non-zero value on failure
> > > - */
> > > -static int add_tcm_banks(struct rproc *rproc)
> > > -{
> > > - struct zynqmp_r5_cluster *cluster;
> > > - struct zynqmp_r5_core *r5_core;
> > > - struct device *dev;
> > > -
> > > - r5_core = rproc->priv;
> > > - if (!r5_core)
> > > - return -EINVAL;
> > > -
> > > - dev = r5_core->dev;
> > > -
> > > - cluster = dev_get_drvdata(dev->parent);
> > > - if (!cluster) {
> > > - dev_err(dev->parent, "Invalid driver data\n");
> > > - return -EINVAL;
> > > - }
> > > -
> > > - /*
> > > - * In lockstep mode TCM banks are one contiguous memory region of 256Kb
> > > - * In split mode, each TCM bank is 64Kb and not contiguous.
> > > - * We add memory carveouts accordingly.
> > > - */
> > > - if (cluster->mode == SPLIT_MODE)
> > > - return add_tcm_carveout_split_mode(rproc);
> > > - else if (cluster->mode == LOCKSTEP_MODE)
> > > - return add_tcm_carveout_lockstep_mode(rproc);
> > > -
> > > - return -EINVAL;
> > > -}
> > > -
> > > /*
> > > * zynqmp_r5_parse_fw()
> > > * @rproc: single R5 core's corresponding rproc instance
> > > --
> > > 2.25.1
> > >