From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: Gavin Shan <gwshan@linux.vnet.ibm.com>, linuxppc-dev@lists.ozlabs.org
Cc: linux-pci@vger.kernel.org, devicetree@vger.kernel.org,
benh@kernel.crashing.org, mpe@ellerman.id.au,
bhelgaas@google.com, grant.likely@linaro.org,
robherring2@gmail.com, panto@antoniou-consulting.com
Subject: Re: [PATCH v6 10/42] powerpc/powernv: pnv_ioda_setup_dma() configure one PE only
Date: Mon, 10 Aug 2015 19:31:11 +1000 [thread overview]
Message-ID: <55C86F5F.70603@ozlabs.ru> (raw)
In-Reply-To: <1438834307-26960-11-git-send-email-gwshan@linux.vnet.ibm.com>
On 08/06/2015 02:11 PM, Gavin Shan wrote:
> The original implementation of pnv_ioda_setup_dma() iterates the
> list of PEs and configures the DMA32 space for them one by one.
> The function was designed to be called during PHB fixup time.
> When configuring PE's DMA32 space in pcibios_setup_bridge(), in
> order to support PCI hotplug, we have to have the function PE
> oriented.
>
> This renames pnv_ioda_setup_dma() to pnv_ioda1_setup_dma() and
> adds one more argument "struct pnv_ioda_pe *pe" to it. The caller,
> pnv_pci_ioda_setup_DMA(), gets PE from the list and passes to it
> or pnv_pci_ioda2_setup_dma_pe(). The patch shouldn't cause behavioral
> changes.
>
> Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
> ---
> arch/powerpc/platforms/powernv/pci-ioda.c | 75 +++++++++++++++----------------
> 1 file changed, 36 insertions(+), 39 deletions(-)
>
> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
> index 8456f37..cd22002 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -2443,52 +2443,29 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
> pnv_ioda_setup_bus_dma(pe, pe->pbus);
> }
>
> -static void pnv_ioda_setup_dma(struct pnv_phb *phb)
> +static unsigned int pnv_ioda1_setup_dma(struct pnv_phb *phb,
> + struct pnv_ioda_pe *pe,
> + unsigned int base)
> {
> struct pci_controller *hose = phb->hose;
> - struct pnv_ioda_pe *pe;
> - unsigned int dma_weight;
> + unsigned int dma_weight, segs;
>
> /* Calculate the PHB's DMA weight */
> dma_weight = pnv_ioda_phb_dma_weight(phb);
> pr_info("PCI%04x has %ld DMA32 segments, total weight %d\n",
> hose->global_number, phb->ioda.dma32_segcount, dma_weight);
>
> - pnv_pci_ioda_setup_opal_tce_kill(phb);
> -
> - /* Walk our PE list and configure their DMA segments, hand them
> - * out one base segment plus any residual segments based on
> - * weight
> - */
> - list_for_each_entry(pe, &phb->ioda.pe_dma_list, dma_link) {
> - if (!pe->dma32_weight)
> - continue;
> -
> - /*
> - * For IODA2 compliant PHB3, we needn't care about the weight.
> - * The all available 32-bits DMA space will be assigned to
> - * the specific PE.
> - */
> - if (phb->type == PNV_PHB_IODA1) {
> - unsigned int segs, base = 0;
> -
> - if (pe->dma32_weight <
> - dma_weight / phb->ioda.dma32_segcount)
> - segs = 1;
> - else
> - segs = (pe->dma32_weight *
> - phb->ioda.dma32_segcount) / dma_weight;
> -
> - pe_info(pe, "DMA32 weight %d, assigned %d segments\n",
> - pe->dma32_weight, segs);
> - pnv_pci_ioda_setup_dma_pe(phb, pe, base, segs);
> + if (pe->dma32_weight <
> + dma_weight / phb->ioda.dma32_segcount)
Can be one line now.
> + segs = 1;
> + else
> + segs = (pe->dma32_weight *
> + phb->ioda.dma32_segcount) / dma_weight;
> + pe_info(pe, "DMA weight %d, assigned %d segments\n",
> + pe->dma32_weight, segs);
> + pnv_pci_ioda_setup_dma_pe(phb, pe, base, segs);
Why not to merge pnv_ioda1_setup_dma() to pnv_pci_ioda_setup_dma_pe()?
>
> - base += segs;
> - } else {
> - pe_info(pe, "Assign DMA32 space\n");
> - pnv_pci_ioda2_setup_dma_pe(phb, pe);
> - }
> - }
> + return segs;
> }
>
> #ifdef CONFIG_PCI_MSI
> @@ -2955,12 +2932,32 @@ static void pnv_pci_ioda_setup_DMA(void)
> {
> struct pci_controller *hose, *tmp;
> struct pnv_phb *phb;
> + struct pnv_ioda_pe *pe;
> + unsigned int base;
>
> list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
> - pnv_ioda_setup_dma(hose->private_data);
> + phb = hose->private_data;
> + pnv_pci_ioda_setup_opal_tce_kill(phb);
> +
> + base = 0;
> + list_for_each_entry(pe, &phb->ioda.pe_dma_list, dma_link) {
> + if (!pe->dma32_weight)
> + continue;
> +
> + switch (phb->type) {
> + case PNV_PHB_IODA1:
> + base += pnv_ioda1_setup_dma(phb, pe, base);
This @base handling seems never be tested between 8..11 as "[PATCH v6
11/42] powerpc/powernv: Trace DMA32 segments consumed by PE"
removes it and I suspect you only tested the final version. Which is ok for
the final result but not ok for bisectability.
Looks like 8/42, 9/42, 10/42, 11/42 need to be rearranged or merged to
remove this multiple @base touching.
> + break;
> + case PNV_PHB_IODA2:
> + pnv_pci_ioda2_setup_dma_pe(phb, pe);
> + break;
> + default:
> + pr_warn("%s: No DMA for PHB type %d\n",
> + __func__, phb->type);
> + }
> + }
>
> /* Mark the PHB initialization done */
> - phb = hose->private_data;
> phb->initialized = 1;
> }
> }
>
--
Alexey
next prev parent reply other threads:[~2015-08-10 9:31 UTC|newest]
Thread overview: 102+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-06 4:11 [PATCH v6 00/42] powerpc/powernv: PCI hotplug suppport Gavin Shan
2015-08-06 4:11 ` [PATCH v6 01/42] PCI: Add pcibios_setup_bridge() Gavin Shan
2015-08-06 4:11 ` [PATCH v6 02/42] powerpc/powernv: Drop pnv_ioda_setup_dev_PE() Gavin Shan
2015-08-06 4:11 ` [PATCH v6 03/42] powerpc/powernv: Enable M64 on P7IOC Gavin Shan
2015-08-10 6:30 ` Alexey Kardashevskiy
2015-08-10 23:45 ` Gavin Shan
2015-08-11 2:06 ` Alexey Kardashevskiy
2015-08-12 10:28 ` Gavin Shan
2015-08-06 4:11 ` [PATCH v6 04/42] powerpc/powernv: Reorder fields in struct pnv_phb Gavin Shan
2015-08-06 4:11 ` [PATCH v6 05/42] powerpc/powernv: Track IO/M32/M64 segments from PE Gavin Shan
2015-08-10 7:16 ` Alexey Kardashevskiy
2015-08-11 0:03 ` Gavin Shan
2015-08-11 2:23 ` Alexey Kardashevskiy
2015-08-12 10:45 ` Gavin Shan
2015-08-12 11:05 ` Alexey Kardashevskiy
2015-08-12 11:20 ` Gavin Shan
2015-08-12 12:57 ` Alexey Kardashevskiy
2015-08-12 23:34 ` Gavin Shan
2015-08-06 4:11 ` [PATCH v6 06/42] powerpc/powernv: Simplify pnv_ioda_setup_pe_seg() Gavin Shan
2015-08-06 4:11 ` [PATCH v6 07/42] powerpc/powernv: Improve IO and M32 mapping Gavin Shan
2015-08-10 7:40 ` Alexey Kardashevskiy
2015-08-11 0:12 ` Gavin Shan
2015-08-11 2:32 ` Alexey Kardashevskiy
2015-08-12 23:42 ` Gavin Shan
2015-08-06 4:11 ` [PATCH v6 08/42] powerpc/powernv: Calculate PHB's DMA weight dynamically Gavin Shan
2015-08-10 7:48 ` Alexey Kardashevskiy
2015-08-10 9:21 ` Alexey Kardashevskiy
2015-08-12 23:57 ` Gavin Shan
2015-08-06 4:11 ` [PATCH v6 09/42] powerpc/powernv: DMA32 cleanup Gavin Shan
2015-08-10 8:07 ` Alexey Kardashevskiy
2015-08-11 0:19 ` Gavin Shan
2015-08-06 4:11 ` [PATCH v6 10/42] powerpc/powernv: pnv_ioda_setup_dma() configure one PE only Gavin Shan
2015-08-10 9:31 ` Alexey Kardashevskiy [this message]
2015-08-11 0:29 ` Gavin Shan
2015-08-11 2:39 ` Alexey Kardashevskiy
2015-08-12 23:59 ` Gavin Shan
2015-08-06 4:11 ` [PATCH v6 11/42] powerpc/powernv: Trace DMA32 segments consumed by PE Gavin Shan
2015-08-10 9:43 ` Alexey Kardashevskiy
2015-08-11 0:33 ` Gavin Shan
2015-08-13 0:02 ` Gavin Shan
2015-08-06 4:11 ` [PATCH v6 12/42] powerpc/powernv: Increase PE# capacity Gavin Shan
2015-08-10 9:53 ` Alexey Kardashevskiy
2015-08-11 0:38 ` Gavin Shan
2015-08-11 2:47 ` Alexey Kardashevskiy
2015-08-13 0:23 ` Gavin Shan
2015-08-06 4:11 ` [PATCH v6 13/42] powerpc/pci: Cleanup on pci_controller_ops Gavin Shan
2015-08-06 4:11 ` [PATCH v6 14/42] powerpc/pci: Override pcibios_setup_bridge() Gavin Shan
2015-08-06 4:11 ` [PATCH v6 15/42] powerpc/powernv: PE oriented during configuration Gavin Shan
2015-08-10 10:02 ` Alexey Kardashevskiy
2015-08-11 0:39 ` Gavin Shan
2015-08-06 4:11 ` [PATCH v6 16/42] powerpc/powernv: Helper function pnv_ioda_init_pe() Gavin Shan
2015-08-06 4:11 ` [PATCH v6 17/42] powerpc/powernv: Rename PE# fields in PHB Gavin Shan
2015-08-10 14:21 ` Alexey Kardashevskiy
2015-08-11 0:40 ` Gavin Shan
2015-08-06 4:11 ` [PATCH v6 18/42] powerpc/powernv: Allocate PE# in deasending order Gavin Shan
2015-08-10 14:39 ` Alexey Kardashevskiy
2015-08-11 0:43 ` Gavin Shan
2015-08-11 2:50 ` Alexey Kardashevskiy
2015-08-13 0:28 ` Gavin Shan
2015-08-06 4:11 ` [PATCH v6 19/42] powerpc/powernv: Reserve PE# for root bus Gavin Shan
2015-08-06 4:11 ` [PATCH v6 20/42] powerpc/powernv: Create PEs dynamically Gavin Shan
2015-08-14 13:52 ` Alexey Kardashevskiy
2015-08-15 4:59 ` Gavin Shan
2015-08-15 9:23 ` Alexey Kardashevskiy
2015-08-06 4:11 ` [PATCH v6 21/42] powerpc/powernv: Remove DMA32 list of PEs Gavin Shan
2015-08-06 4:11 ` [PATCH v6 22/42] powerpc/powernv: Move functions around Gavin Shan
2015-08-06 4:11 ` [PATCH v6 23/42] powerpc/powernv: Release PEs dynamically Gavin Shan
2015-08-11 13:03 ` Alexey Kardashevskiy
2015-08-13 0:54 ` Gavin Shan
2015-08-06 4:11 ` [PATCH v6 24/42] powerpc/powernv: Supports slot ID Gavin Shan
2015-08-06 4:11 ` [PATCH v6 25/42] powerpc/powernv: Use PCI slot reset infrastructure Gavin Shan
2015-08-06 4:11 ` [PATCH v6 26/42] powerpc/powernv: Simplify pnv_eeh_reset() Gavin Shan
2015-08-06 4:11 ` [PATCH v6 27/42] powerpc/powernv: Don't cover root bus in pnv_pci_reset_secondary_bus() Gavin Shan
2015-08-06 4:11 ` [PATCH v6 28/42] powerpc/powernv: Fundamental reset " Gavin Shan
2015-08-06 4:11 ` [PATCH v6 29/42] powerpc/pci: Don't scan empty slot Gavin Shan
2015-08-06 4:11 ` [PATCH v6 30/42] powerpc/pci: Move pcibios_find_pci_bus() around Gavin Shan
2015-08-06 4:11 ` [PATCH v6 31/42] powerpc/pci: Rename pcibios_{add, remove}_pci_devices Gavin Shan
2015-08-06 4:11 ` [PATCH v6 32/42] powerpc/powernv: Introduce pnv_pci_poll() Gavin Shan
2015-08-06 4:11 ` [PATCH v6 33/42] powerpc/powernv: Functions to get/reset PCI slot status Gavin Shan
2015-08-06 4:11 ` [PATCH v6 34/42] powerpc/pci: Delay creating pci_dn Gavin Shan
2015-08-06 4:11 ` [PATCH v6 35/42] powerpc/pci: Export traverse_pci_device_nodes() Gavin Shan
2015-08-06 4:11 ` [PATCH v6 36/42] powerpc/pci: Update bridge windows on PCI plugging Gavin Shan
2015-08-06 4:11 ` [PATCH v6 37/42] powerpc/powernv: Select OF_DYNAMIC Gavin Shan
2015-08-06 4:11 ` [PATCH v6 38/42] drivers/of: Unflatten subordinate nodes after specified level Gavin Shan
2015-08-06 14:09 ` Rob Herring
2015-11-03 23:16 ` Gavin Shan
2015-08-06 4:11 ` [PATCH v6 39/42] drivers/of: Allow to specify root node in of_fdt_unflatten_tree() Gavin Shan
2015-08-10 22:42 ` Frank Rowand
2015-08-11 0:52 ` Gavin Shan
2015-08-06 4:11 ` [PATCH v6 40/42] drivers/of: Return allocated memory chunk from of_fdt_unflatten_tree() Gavin Shan
2015-08-06 14:19 ` Rob Herring
2015-08-10 22:42 ` Frank Rowand
2015-08-11 0:52 ` Gavin Shan
2015-08-06 4:11 ` [PATCH v6 41/42] drivers/of: Export OF changeset functions Gavin Shan
2015-08-06 13:48 ` Rob Herring
2015-08-07 1:43 ` Gavin Shan
2015-08-06 4:11 ` [PATCH v6 42/42] pci/hotplug: PowerPC PowerNV PCI hotplug driver Gavin Shan
2015-08-15 3:13 ` Alexey Kardashevskiy
2015-08-15 4:47 ` Gavin Shan
2015-08-15 9:15 ` Alexey Kardashevskiy
2015-08-10 6:05 ` [PATCH v6 00/42] powerpc/powernv: PCI hotplug suppport Alexey Kardashevskiy
2015-08-10 7:17 ` Gavin Shan
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